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[mirror_ubuntu-hirsute-kernel.git] / drivers / s390 / block / dasd_eckd.c
1 /*
2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999, 2009
8 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
9 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
10 */
11
12 #define KMSG_COMPONENT "dasd-eckd"
13
14 #include <linux/stddef.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/hdreg.h> /* HDIO_GETGEO */
18 #include <linux/bio.h>
19 #include <linux/module.h>
20 #include <linux/compat.h>
21 #include <linux/init.h>
22 #include <linux/seq_file.h>
23
24 #include <asm/css_chars.h>
25 #include <asm/debug.h>
26 #include <asm/idals.h>
27 #include <asm/ebcdic.h>
28 #include <asm/io.h>
29 #include <linux/uaccess.h>
30 #include <asm/cio.h>
31 #include <asm/ccwdev.h>
32 #include <asm/itcw.h>
33 #include <asm/schid.h>
34 #include <asm/chpid.h>
35
36 #include "dasd_int.h"
37 #include "dasd_eckd.h"
38
39 #ifdef PRINTK_HEADER
40 #undef PRINTK_HEADER
41 #endif /* PRINTK_HEADER */
42 #define PRINTK_HEADER "dasd(eckd):"
43
44 #define ECKD_C0(i) (i->home_bytes)
45 #define ECKD_F(i) (i->formula)
46 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
47 (i->factors.f_0x02.f1))
48 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
49 (i->factors.f_0x02.f2))
50 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
51 (i->factors.f_0x02.f3))
52 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
53 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
54 #define ECKD_F6(i) (i->factor6)
55 #define ECKD_F7(i) (i->factor7)
56 #define ECKD_F8(i) (i->factor8)
57
58 /*
59 * raw track access always map to 64k in memory
60 * so it maps to 16 blocks of 4k per track
61 */
62 #define DASD_RAW_BLOCK_PER_TRACK 16
63 #define DASD_RAW_BLOCKSIZE 4096
64 /* 64k are 128 x 512 byte sectors */
65 #define DASD_RAW_SECTORS_PER_TRACK 128
66
67 MODULE_LICENSE("GPL");
68
69 static struct dasd_discipline dasd_eckd_discipline;
70
71 /* The ccw bus type uses this table to find devices that it sends to
72 * dasd_eckd_probe */
73 static struct ccw_device_id dasd_eckd_ids[] = {
74 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
75 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
76 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
77 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
78 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
79 { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
80 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
81 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
82 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
83 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
84 { /* end of list */ },
85 };
86
87 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
88
89 static struct ccw_driver dasd_eckd_driver; /* see below */
90
91 static void *rawpadpage;
92
93 #define INIT_CQR_OK 0
94 #define INIT_CQR_UNFORMATTED 1
95 #define INIT_CQR_ERROR 2
96
97 /* emergency request for reserve/release */
98 static struct {
99 struct dasd_ccw_req cqr;
100 struct ccw1 ccw;
101 char data[32];
102 } *dasd_reserve_req;
103 static DEFINE_MUTEX(dasd_reserve_mutex);
104
105 /* definitions for the path verification worker */
106 struct path_verification_work_data {
107 struct work_struct worker;
108 struct dasd_device *device;
109 struct dasd_ccw_req cqr;
110 struct ccw1 ccw;
111 __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
112 int isglobal;
113 __u8 tbvpm;
114 };
115 static struct path_verification_work_data *path_verification_worker;
116 static DEFINE_MUTEX(dasd_path_verification_mutex);
117
118 struct check_attention_work_data {
119 struct work_struct worker;
120 struct dasd_device *device;
121 __u8 lpum;
122 };
123
124 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
125 struct dasd_device *, struct dasd_device *,
126 unsigned int, int, unsigned int, unsigned int,
127 unsigned int, unsigned int);
128
129 /* initial attempt at a probe function. this can be simplified once
130 * the other detection code is gone */
131 static int
132 dasd_eckd_probe (struct ccw_device *cdev)
133 {
134 int ret;
135
136 /* set ECKD specific ccw-device options */
137 ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
138 CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
139 if (ret) {
140 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
141 "dasd_eckd_probe: could not set "
142 "ccw-device options");
143 return ret;
144 }
145 ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
146 return ret;
147 }
148
149 static int
150 dasd_eckd_set_online(struct ccw_device *cdev)
151 {
152 return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
153 }
154
155 static const int sizes_trk0[] = { 28, 148, 84 };
156 #define LABEL_SIZE 140
157
158 /* head and record addresses of count_area read in analysis ccw */
159 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
160 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
161
162 static inline unsigned int
163 round_up_multiple(unsigned int no, unsigned int mult)
164 {
165 int rem = no % mult;
166 return (rem ? no - rem + mult : no);
167 }
168
169 static inline unsigned int
170 ceil_quot(unsigned int d1, unsigned int d2)
171 {
172 return (d1 + (d2 - 1)) / d2;
173 }
174
175 static unsigned int
176 recs_per_track(struct dasd_eckd_characteristics * rdc,
177 unsigned int kl, unsigned int dl)
178 {
179 int dn, kn;
180
181 switch (rdc->dev_type) {
182 case 0x3380:
183 if (kl)
184 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
185 ceil_quot(dl + 12, 32));
186 else
187 return 1499 / (15 + ceil_quot(dl + 12, 32));
188 case 0x3390:
189 dn = ceil_quot(dl + 6, 232) + 1;
190 if (kl) {
191 kn = ceil_quot(kl + 6, 232) + 1;
192 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
193 9 + ceil_quot(dl + 6 * dn, 34));
194 } else
195 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
196 case 0x9345:
197 dn = ceil_quot(dl + 6, 232) + 1;
198 if (kl) {
199 kn = ceil_quot(kl + 6, 232) + 1;
200 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
201 ceil_quot(dl + 6 * dn, 34));
202 } else
203 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
204 }
205 return 0;
206 }
207
208 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
209 {
210 geo->cyl = (__u16) cyl;
211 geo->head = cyl >> 16;
212 geo->head <<= 4;
213 geo->head |= head;
214 }
215
216 static int check_XRC(struct ccw1 *ccw, struct DE_eckd_data *data,
217 struct dasd_device *device)
218 {
219 struct dasd_eckd_private *private = device->private;
220 int rc;
221
222 if (!private->rdc_data.facilities.XRC_supported)
223 return 0;
224
225 /* switch on System Time Stamp - needed for XRC Support */
226 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
227 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
228
229 rc = get_phys_clock(&data->ep_sys_time);
230 /* Ignore return code if sync clock is switched off. */
231 if (rc == -EOPNOTSUPP || rc == -EACCES)
232 rc = 0;
233
234 if (ccw) {
235 ccw->count = sizeof(struct DE_eckd_data);
236 ccw->flags |= CCW_FLAG_SLI;
237 }
238
239 return rc;
240 }
241
242 static int
243 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
244 unsigned int totrk, int cmd, struct dasd_device *device,
245 int blksize)
246 {
247 struct dasd_eckd_private *private = device->private;
248 u16 heads, beghead, endhead;
249 u32 begcyl, endcyl;
250 int rc = 0;
251
252 if (ccw) {
253 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
254 ccw->flags = 0;
255 ccw->count = 16;
256 ccw->cda = (__u32)__pa(data);
257 }
258
259 memset(data, 0, sizeof(struct DE_eckd_data));
260 switch (cmd) {
261 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
262 case DASD_ECKD_CCW_READ_RECORD_ZERO:
263 case DASD_ECKD_CCW_READ:
264 case DASD_ECKD_CCW_READ_MT:
265 case DASD_ECKD_CCW_READ_CKD:
266 case DASD_ECKD_CCW_READ_CKD_MT:
267 case DASD_ECKD_CCW_READ_KD:
268 case DASD_ECKD_CCW_READ_KD_MT:
269 data->mask.perm = 0x1;
270 data->attributes.operation = private->attrib.operation;
271 break;
272 case DASD_ECKD_CCW_READ_COUNT:
273 data->mask.perm = 0x1;
274 data->attributes.operation = DASD_BYPASS_CACHE;
275 break;
276 case DASD_ECKD_CCW_READ_TRACK:
277 case DASD_ECKD_CCW_READ_TRACK_DATA:
278 data->mask.perm = 0x1;
279 data->attributes.operation = private->attrib.operation;
280 data->blk_size = 0;
281 break;
282 case DASD_ECKD_CCW_WRITE:
283 case DASD_ECKD_CCW_WRITE_MT:
284 case DASD_ECKD_CCW_WRITE_KD:
285 case DASD_ECKD_CCW_WRITE_KD_MT:
286 data->mask.perm = 0x02;
287 data->attributes.operation = private->attrib.operation;
288 rc = check_XRC(ccw, data, device);
289 break;
290 case DASD_ECKD_CCW_WRITE_CKD:
291 case DASD_ECKD_CCW_WRITE_CKD_MT:
292 data->attributes.operation = DASD_BYPASS_CACHE;
293 rc = check_XRC(ccw, data, device);
294 break;
295 case DASD_ECKD_CCW_ERASE:
296 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
297 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
298 data->mask.perm = 0x3;
299 data->mask.auth = 0x1;
300 data->attributes.operation = DASD_BYPASS_CACHE;
301 rc = check_XRC(ccw, data, device);
302 break;
303 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
304 data->mask.perm = 0x03;
305 data->attributes.operation = private->attrib.operation;
306 data->blk_size = 0;
307 break;
308 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
309 data->mask.perm = 0x02;
310 data->attributes.operation = private->attrib.operation;
311 data->blk_size = blksize;
312 rc = check_XRC(ccw, data, device);
313 break;
314 default:
315 dev_err(&device->cdev->dev,
316 "0x%x is not a known command\n", cmd);
317 break;
318 }
319
320 data->attributes.mode = 0x3; /* ECKD */
321
322 if ((private->rdc_data.cu_type == 0x2105 ||
323 private->rdc_data.cu_type == 0x2107 ||
324 private->rdc_data.cu_type == 0x1750)
325 && !(private->uses_cdl && trk < 2))
326 data->ga_extended |= 0x40; /* Regular Data Format Mode */
327
328 heads = private->rdc_data.trk_per_cyl;
329 begcyl = trk / heads;
330 beghead = trk % heads;
331 endcyl = totrk / heads;
332 endhead = totrk % heads;
333
334 /* check for sequential prestage - enhance cylinder range */
335 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
336 data->attributes.operation == DASD_SEQ_ACCESS) {
337
338 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
339 endcyl += private->attrib.nr_cyl;
340 else
341 endcyl = (private->real_cyl - 1);
342 }
343
344 set_ch_t(&data->beg_ext, begcyl, beghead);
345 set_ch_t(&data->end_ext, endcyl, endhead);
346 return rc;
347 }
348
349
350 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
351 unsigned int trk, unsigned int rec_on_trk,
352 int count, int cmd, struct dasd_device *device,
353 unsigned int reclen, unsigned int tlf)
354 {
355 struct dasd_eckd_private *private = device->private;
356 int sector;
357 int dn, d;
358
359 if (ccw) {
360 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
361 ccw->flags = 0;
362 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
363 ccw->count = 22;
364 else
365 ccw->count = 20;
366 ccw->cda = (__u32)__pa(data);
367 }
368
369 memset(data, 0, sizeof(*data));
370 sector = 0;
371 if (rec_on_trk) {
372 switch (private->rdc_data.dev_type) {
373 case 0x3390:
374 dn = ceil_quot(reclen + 6, 232);
375 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
376 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
377 break;
378 case 0x3380:
379 d = 7 + ceil_quot(reclen + 12, 32);
380 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
381 break;
382 }
383 }
384 data->sector = sector;
385 /* note: meaning of count depends on the operation
386 * for record based I/O it's the number of records, but for
387 * track based I/O it's the number of tracks
388 */
389 data->count = count;
390 switch (cmd) {
391 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
392 data->operation.orientation = 0x3;
393 data->operation.operation = 0x03;
394 break;
395 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
396 data->operation.orientation = 0x3;
397 data->operation.operation = 0x16;
398 break;
399 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
400 data->operation.orientation = 0x1;
401 data->operation.operation = 0x03;
402 data->count++;
403 break;
404 case DASD_ECKD_CCW_READ_RECORD_ZERO:
405 data->operation.orientation = 0x3;
406 data->operation.operation = 0x16;
407 data->count++;
408 break;
409 case DASD_ECKD_CCW_WRITE:
410 case DASD_ECKD_CCW_WRITE_MT:
411 case DASD_ECKD_CCW_WRITE_KD:
412 case DASD_ECKD_CCW_WRITE_KD_MT:
413 data->auxiliary.length_valid = 0x1;
414 data->length = reclen;
415 data->operation.operation = 0x01;
416 break;
417 case DASD_ECKD_CCW_WRITE_CKD:
418 case DASD_ECKD_CCW_WRITE_CKD_MT:
419 data->auxiliary.length_valid = 0x1;
420 data->length = reclen;
421 data->operation.operation = 0x03;
422 break;
423 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
424 data->operation.orientation = 0x0;
425 data->operation.operation = 0x3F;
426 data->extended_operation = 0x11;
427 data->length = 0;
428 data->extended_parameter_length = 0x02;
429 if (data->count > 8) {
430 data->extended_parameter[0] = 0xFF;
431 data->extended_parameter[1] = 0xFF;
432 data->extended_parameter[1] <<= (16 - count);
433 } else {
434 data->extended_parameter[0] = 0xFF;
435 data->extended_parameter[0] <<= (8 - count);
436 data->extended_parameter[1] = 0x00;
437 }
438 data->sector = 0xFF;
439 break;
440 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
441 data->auxiliary.length_valid = 0x1;
442 data->length = reclen; /* not tlf, as one might think */
443 data->operation.operation = 0x3F;
444 data->extended_operation = 0x23;
445 break;
446 case DASD_ECKD_CCW_READ:
447 case DASD_ECKD_CCW_READ_MT:
448 case DASD_ECKD_CCW_READ_KD:
449 case DASD_ECKD_CCW_READ_KD_MT:
450 data->auxiliary.length_valid = 0x1;
451 data->length = reclen;
452 data->operation.operation = 0x06;
453 break;
454 case DASD_ECKD_CCW_READ_CKD:
455 case DASD_ECKD_CCW_READ_CKD_MT:
456 data->auxiliary.length_valid = 0x1;
457 data->length = reclen;
458 data->operation.operation = 0x16;
459 break;
460 case DASD_ECKD_CCW_READ_COUNT:
461 data->operation.operation = 0x06;
462 break;
463 case DASD_ECKD_CCW_READ_TRACK:
464 data->operation.orientation = 0x1;
465 data->operation.operation = 0x0C;
466 data->extended_parameter_length = 0;
467 data->sector = 0xFF;
468 break;
469 case DASD_ECKD_CCW_READ_TRACK_DATA:
470 data->auxiliary.length_valid = 0x1;
471 data->length = tlf;
472 data->operation.operation = 0x0C;
473 break;
474 case DASD_ECKD_CCW_ERASE:
475 data->length = reclen;
476 data->auxiliary.length_valid = 0x1;
477 data->operation.operation = 0x0b;
478 break;
479 default:
480 DBF_DEV_EVENT(DBF_ERR, device,
481 "fill LRE unknown opcode 0x%x", cmd);
482 BUG();
483 }
484 set_ch_t(&data->seek_addr,
485 trk / private->rdc_data.trk_per_cyl,
486 trk % private->rdc_data.trk_per_cyl);
487 data->search_arg.cyl = data->seek_addr.cyl;
488 data->search_arg.head = data->seek_addr.head;
489 data->search_arg.record = rec_on_trk;
490 }
491
492 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
493 unsigned int trk, unsigned int totrk, int cmd,
494 struct dasd_device *basedev, struct dasd_device *startdev,
495 unsigned int format, unsigned int rec_on_trk, int count,
496 unsigned int blksize, unsigned int tlf)
497 {
498 struct dasd_eckd_private *basepriv, *startpriv;
499 struct LRE_eckd_data *lredata;
500 struct DE_eckd_data *dedata;
501 int rc = 0;
502
503 basepriv = basedev->private;
504 startpriv = startdev->private;
505 dedata = &pfxdata->define_extent;
506 lredata = &pfxdata->locate_record;
507
508 ccw->cmd_code = DASD_ECKD_CCW_PFX;
509 ccw->flags = 0;
510 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
511 ccw->count = sizeof(*pfxdata) + 2;
512 ccw->cda = (__u32) __pa(pfxdata);
513 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
514 } else {
515 ccw->count = sizeof(*pfxdata);
516 ccw->cda = (__u32) __pa(pfxdata);
517 memset(pfxdata, 0, sizeof(*pfxdata));
518 }
519
520 /* prefix data */
521 if (format > 1) {
522 DBF_DEV_EVENT(DBF_ERR, basedev,
523 "PFX LRE unknown format 0x%x", format);
524 BUG();
525 return -EINVAL;
526 }
527 pfxdata->format = format;
528 pfxdata->base_address = basepriv->ned->unit_addr;
529 pfxdata->base_lss = basepriv->ned->ID;
530 pfxdata->validity.define_extent = 1;
531
532 /* private uid is kept up to date, conf_data may be outdated */
533 if (startpriv->uid.type != UA_BASE_DEVICE) {
534 pfxdata->validity.verify_base = 1;
535 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
536 pfxdata->validity.hyper_pav = 1;
537 }
538
539 rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
540
541 /*
542 * For some commands the System Time Stamp is set in the define extent
543 * data when XRC is supported. The validity of the time stamp must be
544 * reflected in the prefix data as well.
545 */
546 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
547 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
548
549 if (format == 1) {
550 locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
551 basedev, blksize, tlf);
552 }
553
554 return rc;
555 }
556
557 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
558 unsigned int trk, unsigned int totrk, int cmd,
559 struct dasd_device *basedev, struct dasd_device *startdev)
560 {
561 return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
562 0, 0, 0, 0, 0);
563 }
564
565 static void
566 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
567 unsigned int rec_on_trk, int no_rec, int cmd,
568 struct dasd_device * device, int reclen)
569 {
570 struct dasd_eckd_private *private = device->private;
571 int sector;
572 int dn, d;
573
574 DBF_DEV_EVENT(DBF_INFO, device,
575 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
576 trk, rec_on_trk, no_rec, cmd, reclen);
577
578 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
579 ccw->flags = 0;
580 ccw->count = 16;
581 ccw->cda = (__u32) __pa(data);
582
583 memset(data, 0, sizeof(struct LO_eckd_data));
584 sector = 0;
585 if (rec_on_trk) {
586 switch (private->rdc_data.dev_type) {
587 case 0x3390:
588 dn = ceil_quot(reclen + 6, 232);
589 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
590 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
591 break;
592 case 0x3380:
593 d = 7 + ceil_quot(reclen + 12, 32);
594 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
595 break;
596 }
597 }
598 data->sector = sector;
599 data->count = no_rec;
600 switch (cmd) {
601 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
602 data->operation.orientation = 0x3;
603 data->operation.operation = 0x03;
604 break;
605 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
606 data->operation.orientation = 0x3;
607 data->operation.operation = 0x16;
608 break;
609 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
610 data->operation.orientation = 0x1;
611 data->operation.operation = 0x03;
612 data->count++;
613 break;
614 case DASD_ECKD_CCW_READ_RECORD_ZERO:
615 data->operation.orientation = 0x3;
616 data->operation.operation = 0x16;
617 data->count++;
618 break;
619 case DASD_ECKD_CCW_WRITE:
620 case DASD_ECKD_CCW_WRITE_MT:
621 case DASD_ECKD_CCW_WRITE_KD:
622 case DASD_ECKD_CCW_WRITE_KD_MT:
623 data->auxiliary.last_bytes_used = 0x1;
624 data->length = reclen;
625 data->operation.operation = 0x01;
626 break;
627 case DASD_ECKD_CCW_WRITE_CKD:
628 case DASD_ECKD_CCW_WRITE_CKD_MT:
629 data->auxiliary.last_bytes_used = 0x1;
630 data->length = reclen;
631 data->operation.operation = 0x03;
632 break;
633 case DASD_ECKD_CCW_READ:
634 case DASD_ECKD_CCW_READ_MT:
635 case DASD_ECKD_CCW_READ_KD:
636 case DASD_ECKD_CCW_READ_KD_MT:
637 data->auxiliary.last_bytes_used = 0x1;
638 data->length = reclen;
639 data->operation.operation = 0x06;
640 break;
641 case DASD_ECKD_CCW_READ_CKD:
642 case DASD_ECKD_CCW_READ_CKD_MT:
643 data->auxiliary.last_bytes_used = 0x1;
644 data->length = reclen;
645 data->operation.operation = 0x16;
646 break;
647 case DASD_ECKD_CCW_READ_COUNT:
648 data->operation.operation = 0x06;
649 break;
650 case DASD_ECKD_CCW_ERASE:
651 data->length = reclen;
652 data->auxiliary.last_bytes_used = 0x1;
653 data->operation.operation = 0x0b;
654 break;
655 default:
656 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
657 "opcode 0x%x", cmd);
658 }
659 set_ch_t(&data->seek_addr,
660 trk / private->rdc_data.trk_per_cyl,
661 trk % private->rdc_data.trk_per_cyl);
662 data->search_arg.cyl = data->seek_addr.cyl;
663 data->search_arg.head = data->seek_addr.head;
664 data->search_arg.record = rec_on_trk;
665 }
666
667 /*
668 * Returns 1 if the block is one of the special blocks that needs
669 * to get read/written with the KD variant of the command.
670 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
671 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
672 * Luckily the KD variants differ only by one bit (0x08) from the
673 * normal variant. So don't wonder about code like:
674 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
675 * ccw->cmd_code |= 0x8;
676 */
677 static inline int
678 dasd_eckd_cdl_special(int blk_per_trk, int recid)
679 {
680 if (recid < 3)
681 return 1;
682 if (recid < blk_per_trk)
683 return 0;
684 if (recid < 2 * blk_per_trk)
685 return 1;
686 return 0;
687 }
688
689 /*
690 * Returns the record size for the special blocks of the cdl format.
691 * Only returns something useful if dasd_eckd_cdl_special is true
692 * for the recid.
693 */
694 static inline int
695 dasd_eckd_cdl_reclen(int recid)
696 {
697 if (recid < 3)
698 return sizes_trk0[recid];
699 return LABEL_SIZE;
700 }
701 /* create unique id from private structure. */
702 static void create_uid(struct dasd_eckd_private *private)
703 {
704 int count;
705 struct dasd_uid *uid;
706
707 uid = &private->uid;
708 memset(uid, 0, sizeof(struct dasd_uid));
709 memcpy(uid->vendor, private->ned->HDA_manufacturer,
710 sizeof(uid->vendor) - 1);
711 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
712 memcpy(uid->serial, private->ned->HDA_location,
713 sizeof(uid->serial) - 1);
714 EBCASC(uid->serial, sizeof(uid->serial) - 1);
715 uid->ssid = private->gneq->subsystemID;
716 uid->real_unit_addr = private->ned->unit_addr;
717 if (private->sneq) {
718 uid->type = private->sneq->sua_flags;
719 if (uid->type == UA_BASE_PAV_ALIAS)
720 uid->base_unit_addr = private->sneq->base_unit_addr;
721 } else {
722 uid->type = UA_BASE_DEVICE;
723 }
724 if (private->vdsneq) {
725 for (count = 0; count < 16; count++) {
726 sprintf(uid->vduit+2*count, "%02x",
727 private->vdsneq->uit[count]);
728 }
729 }
730 }
731
732 /*
733 * Generate device unique id that specifies the physical device.
734 */
735 static int dasd_eckd_generate_uid(struct dasd_device *device)
736 {
737 struct dasd_eckd_private *private = device->private;
738 unsigned long flags;
739
740 if (!private)
741 return -ENODEV;
742 if (!private->ned || !private->gneq)
743 return -ENODEV;
744 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
745 create_uid(private);
746 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
747 return 0;
748 }
749
750 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
751 {
752 struct dasd_eckd_private *private = device->private;
753 unsigned long flags;
754
755 if (private) {
756 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
757 *uid = private->uid;
758 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
759 return 0;
760 }
761 return -EINVAL;
762 }
763
764 /*
765 * compare device UID with data of a given dasd_eckd_private structure
766 * return 0 for match
767 */
768 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
769 struct dasd_eckd_private *private)
770 {
771 struct dasd_uid device_uid;
772
773 create_uid(private);
774 dasd_eckd_get_uid(device, &device_uid);
775
776 return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
777 }
778
779 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
780 struct dasd_ccw_req *cqr,
781 __u8 *rcd_buffer,
782 __u8 lpm)
783 {
784 struct ccw1 *ccw;
785 /*
786 * buffer has to start with EBCDIC "V1.0" to show
787 * support for virtual device SNEQ
788 */
789 rcd_buffer[0] = 0xE5;
790 rcd_buffer[1] = 0xF1;
791 rcd_buffer[2] = 0x4B;
792 rcd_buffer[3] = 0xF0;
793
794 ccw = cqr->cpaddr;
795 ccw->cmd_code = DASD_ECKD_CCW_RCD;
796 ccw->flags = 0;
797 ccw->cda = (__u32)(addr_t)rcd_buffer;
798 ccw->count = DASD_ECKD_RCD_DATA_SIZE;
799 cqr->magic = DASD_ECKD_MAGIC;
800
801 cqr->startdev = device;
802 cqr->memdev = device;
803 cqr->block = NULL;
804 cqr->expires = 10*HZ;
805 cqr->lpm = lpm;
806 cqr->retries = 256;
807 cqr->buildclk = get_tod_clock();
808 cqr->status = DASD_CQR_FILLED;
809 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
810 }
811
812 /*
813 * Wakeup helper for read_conf
814 * if the cqr is not done and needs some error recovery
815 * the buffer has to be re-initialized with the EBCDIC "V1.0"
816 * to show support for virtual device SNEQ
817 */
818 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
819 {
820 struct ccw1 *ccw;
821 __u8 *rcd_buffer;
822
823 if (cqr->status != DASD_CQR_DONE) {
824 ccw = cqr->cpaddr;
825 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
826 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
827
828 rcd_buffer[0] = 0xE5;
829 rcd_buffer[1] = 0xF1;
830 rcd_buffer[2] = 0x4B;
831 rcd_buffer[3] = 0xF0;
832 }
833 dasd_wakeup_cb(cqr, data);
834 }
835
836 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
837 struct dasd_ccw_req *cqr,
838 __u8 *rcd_buffer,
839 __u8 lpm)
840 {
841 struct ciw *ciw;
842 int rc;
843 /*
844 * sanity check: scan for RCD command in extended SenseID data
845 * some devices do not support RCD
846 */
847 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
848 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
849 return -EOPNOTSUPP;
850
851 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
852 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
853 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
854 cqr->retries = 5;
855 cqr->callback = read_conf_cb;
856 rc = dasd_sleep_on_immediatly(cqr);
857 return rc;
858 }
859
860 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
861 void **rcd_buffer,
862 int *rcd_buffer_size, __u8 lpm)
863 {
864 struct ciw *ciw;
865 char *rcd_buf = NULL;
866 int ret;
867 struct dasd_ccw_req *cqr;
868
869 /*
870 * sanity check: scan for RCD command in extended SenseID data
871 * some devices do not support RCD
872 */
873 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
874 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
875 ret = -EOPNOTSUPP;
876 goto out_error;
877 }
878 rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
879 if (!rcd_buf) {
880 ret = -ENOMEM;
881 goto out_error;
882 }
883 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
884 0, /* use rcd_buf as data ara */
885 device);
886 if (IS_ERR(cqr)) {
887 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
888 "Could not allocate RCD request");
889 ret = -ENOMEM;
890 goto out_error;
891 }
892 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
893 cqr->callback = read_conf_cb;
894 ret = dasd_sleep_on(cqr);
895 /*
896 * on success we update the user input parms
897 */
898 dasd_sfree_request(cqr, cqr->memdev);
899 if (ret)
900 goto out_error;
901
902 *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
903 *rcd_buffer = rcd_buf;
904 return 0;
905 out_error:
906 kfree(rcd_buf);
907 *rcd_buffer = NULL;
908 *rcd_buffer_size = 0;
909 return ret;
910 }
911
912 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
913 {
914
915 struct dasd_sneq *sneq;
916 int i, count;
917
918 private->ned = NULL;
919 private->sneq = NULL;
920 private->vdsneq = NULL;
921 private->gneq = NULL;
922 count = private->conf_len / sizeof(struct dasd_sneq);
923 sneq = (struct dasd_sneq *)private->conf_data;
924 for (i = 0; i < count; ++i) {
925 if (sneq->flags.identifier == 1 && sneq->format == 1)
926 private->sneq = sneq;
927 else if (sneq->flags.identifier == 1 && sneq->format == 4)
928 private->vdsneq = (struct vd_sneq *)sneq;
929 else if (sneq->flags.identifier == 2)
930 private->gneq = (struct dasd_gneq *)sneq;
931 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
932 private->ned = (struct dasd_ned *)sneq;
933 sneq++;
934 }
935 if (!private->ned || !private->gneq) {
936 private->ned = NULL;
937 private->sneq = NULL;
938 private->vdsneq = NULL;
939 private->gneq = NULL;
940 return -EINVAL;
941 }
942 return 0;
943
944 };
945
946 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
947 {
948 struct dasd_gneq *gneq;
949 int i, count, found;
950
951 count = conf_len / sizeof(*gneq);
952 gneq = (struct dasd_gneq *)conf_data;
953 found = 0;
954 for (i = 0; i < count; ++i) {
955 if (gneq->flags.identifier == 2) {
956 found = 1;
957 break;
958 }
959 gneq++;
960 }
961 if (found)
962 return ((char *)gneq)[18] & 0x07;
963 else
964 return 0;
965 }
966
967 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
968 {
969 struct dasd_eckd_private *private = device->private;
970 int i;
971
972 private->conf_data = NULL;
973 private->conf_len = 0;
974 for (i = 0; i < 8; i++) {
975 kfree(device->path[i].conf_data);
976 device->path[i].conf_data = NULL;
977 device->path[i].cssid = 0;
978 device->path[i].ssid = 0;
979 device->path[i].chpid = 0;
980 }
981 }
982
983
984 static int dasd_eckd_read_conf(struct dasd_device *device)
985 {
986 void *conf_data;
987 int conf_len, conf_data_saved;
988 int rc, path_err, pos;
989 __u8 lpm, opm;
990 struct dasd_eckd_private *private, path_private;
991 struct dasd_uid *uid;
992 char print_path_uid[60], print_device_uid[60];
993 struct channel_path_desc *chp_desc;
994 struct subchannel_id sch_id;
995
996 private = device->private;
997 opm = ccw_device_get_path_mask(device->cdev);
998 ccw_device_get_schid(device->cdev, &sch_id);
999 conf_data_saved = 0;
1000 path_err = 0;
1001 /* get configuration data per operational path */
1002 for (lpm = 0x80; lpm; lpm>>= 1) {
1003 if (!(lpm & opm))
1004 continue;
1005 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1006 &conf_len, lpm);
1007 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
1008 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1009 "Read configuration data returned "
1010 "error %d", rc);
1011 return rc;
1012 }
1013 if (conf_data == NULL) {
1014 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1015 "No configuration data "
1016 "retrieved");
1017 /* no further analysis possible */
1018 dasd_path_add_opm(device, opm);
1019 continue; /* no error */
1020 }
1021 /* save first valid configuration data */
1022 if (!conf_data_saved) {
1023 /* initially clear previously stored conf_data */
1024 dasd_eckd_clear_conf_data(device);
1025 private->conf_data = conf_data;
1026 private->conf_len = conf_len;
1027 if (dasd_eckd_identify_conf_parts(private)) {
1028 private->conf_data = NULL;
1029 private->conf_len = 0;
1030 kfree(conf_data);
1031 continue;
1032 }
1033 pos = pathmask_to_pos(lpm);
1034 /* store per path conf_data */
1035 device->path[pos].conf_data = conf_data;
1036 device->path[pos].cssid = sch_id.cssid;
1037 device->path[pos].ssid = sch_id.ssid;
1038 chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1039 if (chp_desc)
1040 device->path[pos].chpid = chp_desc->chpid;
1041 kfree(chp_desc);
1042 /*
1043 * build device UID that other path data
1044 * can be compared to it
1045 */
1046 dasd_eckd_generate_uid(device);
1047 conf_data_saved++;
1048 } else {
1049 path_private.conf_data = conf_data;
1050 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1051 if (dasd_eckd_identify_conf_parts(
1052 &path_private)) {
1053 path_private.conf_data = NULL;
1054 path_private.conf_len = 0;
1055 kfree(conf_data);
1056 continue;
1057 }
1058 if (dasd_eckd_compare_path_uid(
1059 device, &path_private)) {
1060 uid = &path_private.uid;
1061 if (strlen(uid->vduit) > 0)
1062 snprintf(print_path_uid,
1063 sizeof(print_path_uid),
1064 "%s.%s.%04x.%02x.%s",
1065 uid->vendor, uid->serial,
1066 uid->ssid, uid->real_unit_addr,
1067 uid->vduit);
1068 else
1069 snprintf(print_path_uid,
1070 sizeof(print_path_uid),
1071 "%s.%s.%04x.%02x",
1072 uid->vendor, uid->serial,
1073 uid->ssid,
1074 uid->real_unit_addr);
1075 uid = &private->uid;
1076 if (strlen(uid->vduit) > 0)
1077 snprintf(print_device_uid,
1078 sizeof(print_device_uid),
1079 "%s.%s.%04x.%02x.%s",
1080 uid->vendor, uid->serial,
1081 uid->ssid, uid->real_unit_addr,
1082 uid->vduit);
1083 else
1084 snprintf(print_device_uid,
1085 sizeof(print_device_uid),
1086 "%s.%s.%04x.%02x",
1087 uid->vendor, uid->serial,
1088 uid->ssid,
1089 uid->real_unit_addr);
1090 dev_err(&device->cdev->dev,
1091 "Not all channel paths lead to "
1092 "the same device, path %02X leads to "
1093 "device %s instead of %s\n", lpm,
1094 print_path_uid, print_device_uid);
1095 path_err = -EINVAL;
1096 dasd_path_add_cablepm(device, lpm);
1097 continue;
1098 }
1099 pos = pathmask_to_pos(lpm);
1100 /* store per path conf_data */
1101 device->path[pos].conf_data = conf_data;
1102 device->path[pos].cssid = sch_id.cssid;
1103 device->path[pos].ssid = sch_id.ssid;
1104 chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1105 if (chp_desc)
1106 device->path[pos].chpid = chp_desc->chpid;
1107 kfree(chp_desc);
1108 path_private.conf_data = NULL;
1109 path_private.conf_len = 0;
1110 }
1111 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1112 case 0x02:
1113 dasd_path_add_nppm(device, lpm);
1114 break;
1115 case 0x03:
1116 dasd_path_add_ppm(device, lpm);
1117 break;
1118 }
1119 if (!dasd_path_get_opm(device)) {
1120 dasd_path_set_opm(device, lpm);
1121 dasd_generic_path_operational(device);
1122 } else {
1123 dasd_path_add_opm(device, lpm);
1124 }
1125 }
1126
1127 return path_err;
1128 }
1129
1130 static u32 get_fcx_max_data(struct dasd_device *device)
1131 {
1132 struct dasd_eckd_private *private = device->private;
1133 int fcx_in_css, fcx_in_gneq, fcx_in_features;
1134 int tpm, mdc;
1135
1136 if (dasd_nofcx)
1137 return 0;
1138 /* is transport mode supported? */
1139 fcx_in_css = css_general_characteristics.fcx;
1140 fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1141 fcx_in_features = private->features.feature[40] & 0x80;
1142 tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1143
1144 if (!tpm)
1145 return 0;
1146
1147 mdc = ccw_device_get_mdc(device->cdev, 0);
1148 if (mdc < 0) {
1149 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1150 return 0;
1151 } else {
1152 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1153 }
1154 }
1155
1156 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1157 {
1158 struct dasd_eckd_private *private = device->private;
1159 int mdc;
1160 u32 fcx_max_data;
1161
1162 if (private->fcx_max_data) {
1163 mdc = ccw_device_get_mdc(device->cdev, lpm);
1164 if ((mdc < 0)) {
1165 dev_warn(&device->cdev->dev,
1166 "Detecting the maximum data size for zHPF "
1167 "requests failed (rc=%d) for a new path %x\n",
1168 mdc, lpm);
1169 return mdc;
1170 }
1171 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1172 if (fcx_max_data < private->fcx_max_data) {
1173 dev_warn(&device->cdev->dev,
1174 "The maximum data size for zHPF requests %u "
1175 "on a new path %x is below the active maximum "
1176 "%u\n", fcx_max_data, lpm,
1177 private->fcx_max_data);
1178 return -EACCES;
1179 }
1180 }
1181 return 0;
1182 }
1183
1184 static int rebuild_device_uid(struct dasd_device *device,
1185 struct path_verification_work_data *data)
1186 {
1187 struct dasd_eckd_private *private = device->private;
1188 __u8 lpm, opm = dasd_path_get_opm(device);
1189 int rc = -ENODEV;
1190
1191 for (lpm = 0x80; lpm; lpm >>= 1) {
1192 if (!(lpm & opm))
1193 continue;
1194 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1195 memset(&data->cqr, 0, sizeof(data->cqr));
1196 data->cqr.cpaddr = &data->ccw;
1197 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1198 data->rcd_buffer,
1199 lpm);
1200
1201 if (rc) {
1202 if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1203 continue;
1204 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1205 "Read configuration data "
1206 "returned error %d", rc);
1207 break;
1208 }
1209 memcpy(private->conf_data, data->rcd_buffer,
1210 DASD_ECKD_RCD_DATA_SIZE);
1211 if (dasd_eckd_identify_conf_parts(private)) {
1212 rc = -ENODEV;
1213 } else /* first valid path is enough */
1214 break;
1215 }
1216
1217 if (!rc)
1218 rc = dasd_eckd_generate_uid(device);
1219
1220 return rc;
1221 }
1222
1223 static void do_path_verification_work(struct work_struct *work)
1224 {
1225 struct path_verification_work_data *data;
1226 struct dasd_device *device;
1227 struct dasd_eckd_private path_private;
1228 struct dasd_uid *uid;
1229 __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1230 __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1231 unsigned long flags;
1232 char print_uid[60];
1233 int rc;
1234
1235 data = container_of(work, struct path_verification_work_data, worker);
1236 device = data->device;
1237
1238 /* delay path verification until device was resumed */
1239 if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1240 schedule_work(work);
1241 return;
1242 }
1243 /* check if path verification already running and delay if so */
1244 if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1245 schedule_work(work);
1246 return;
1247 }
1248 opm = 0;
1249 npm = 0;
1250 ppm = 0;
1251 epm = 0;
1252 hpfpm = 0;
1253 cablepm = 0;
1254
1255 for (lpm = 0x80; lpm; lpm >>= 1) {
1256 if (!(lpm & data->tbvpm))
1257 continue;
1258 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1259 memset(&data->cqr, 0, sizeof(data->cqr));
1260 data->cqr.cpaddr = &data->ccw;
1261 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1262 data->rcd_buffer,
1263 lpm);
1264 if (!rc) {
1265 switch (dasd_eckd_path_access(data->rcd_buffer,
1266 DASD_ECKD_RCD_DATA_SIZE)
1267 ) {
1268 case 0x02:
1269 npm |= lpm;
1270 break;
1271 case 0x03:
1272 ppm |= lpm;
1273 break;
1274 }
1275 opm |= lpm;
1276 } else if (rc == -EOPNOTSUPP) {
1277 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1278 "path verification: No configuration "
1279 "data retrieved");
1280 opm |= lpm;
1281 } else if (rc == -EAGAIN) {
1282 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1283 "path verification: device is stopped,"
1284 " try again later");
1285 epm |= lpm;
1286 } else {
1287 dev_warn(&device->cdev->dev,
1288 "Reading device feature codes failed "
1289 "(rc=%d) for new path %x\n", rc, lpm);
1290 continue;
1291 }
1292 if (verify_fcx_max_data(device, lpm)) {
1293 opm &= ~lpm;
1294 npm &= ~lpm;
1295 ppm &= ~lpm;
1296 hpfpm |= lpm;
1297 continue;
1298 }
1299
1300 /*
1301 * save conf_data for comparison after
1302 * rebuild_device_uid may have changed
1303 * the original data
1304 */
1305 memcpy(&path_rcd_buf, data->rcd_buffer,
1306 DASD_ECKD_RCD_DATA_SIZE);
1307 path_private.conf_data = (void *) &path_rcd_buf;
1308 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1309 if (dasd_eckd_identify_conf_parts(&path_private)) {
1310 path_private.conf_data = NULL;
1311 path_private.conf_len = 0;
1312 continue;
1313 }
1314
1315 /*
1316 * compare path UID with device UID only if at least
1317 * one valid path is left
1318 * in other case the device UID may have changed and
1319 * the first working path UID will be used as device UID
1320 */
1321 if (dasd_path_get_opm(device) &&
1322 dasd_eckd_compare_path_uid(device, &path_private)) {
1323 /*
1324 * the comparison was not successful
1325 * rebuild the device UID with at least one
1326 * known path in case a z/VM hyperswap command
1327 * has changed the device
1328 *
1329 * after this compare again
1330 *
1331 * if either the rebuild or the recompare fails
1332 * the path can not be used
1333 */
1334 if (rebuild_device_uid(device, data) ||
1335 dasd_eckd_compare_path_uid(
1336 device, &path_private)) {
1337 uid = &path_private.uid;
1338 if (strlen(uid->vduit) > 0)
1339 snprintf(print_uid, sizeof(print_uid),
1340 "%s.%s.%04x.%02x.%s",
1341 uid->vendor, uid->serial,
1342 uid->ssid, uid->real_unit_addr,
1343 uid->vduit);
1344 else
1345 snprintf(print_uid, sizeof(print_uid),
1346 "%s.%s.%04x.%02x",
1347 uid->vendor, uid->serial,
1348 uid->ssid,
1349 uid->real_unit_addr);
1350 dev_err(&device->cdev->dev,
1351 "The newly added channel path %02X "
1352 "will not be used because it leads "
1353 "to a different device %s\n",
1354 lpm, print_uid);
1355 opm &= ~lpm;
1356 npm &= ~lpm;
1357 ppm &= ~lpm;
1358 cablepm |= lpm;
1359 continue;
1360 }
1361 }
1362
1363 /*
1364 * There is a small chance that a path is lost again between
1365 * above path verification and the following modification of
1366 * the device opm mask. We could avoid that race here by using
1367 * yet another path mask, but we rather deal with this unlikely
1368 * situation in dasd_start_IO.
1369 */
1370 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1371 if (!dasd_path_get_opm(device) && opm) {
1372 dasd_path_set_opm(device, opm);
1373 dasd_generic_path_operational(device);
1374 } else {
1375 dasd_path_add_opm(device, opm);
1376 }
1377 dasd_path_add_nppm(device, npm);
1378 dasd_path_add_ppm(device, ppm);
1379 dasd_path_add_tbvpm(device, epm);
1380 dasd_path_add_cablepm(device, cablepm);
1381 dasd_path_add_nohpfpm(device, hpfpm);
1382 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1383 }
1384 clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1385 dasd_put_device(device);
1386 if (data->isglobal)
1387 mutex_unlock(&dasd_path_verification_mutex);
1388 else
1389 kfree(data);
1390 }
1391
1392 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1393 {
1394 struct path_verification_work_data *data;
1395
1396 data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1397 if (!data) {
1398 if (mutex_trylock(&dasd_path_verification_mutex)) {
1399 data = path_verification_worker;
1400 data->isglobal = 1;
1401 } else
1402 return -ENOMEM;
1403 } else {
1404 memset(data, 0, sizeof(*data));
1405 data->isglobal = 0;
1406 }
1407 INIT_WORK(&data->worker, do_path_verification_work);
1408 dasd_get_device(device);
1409 data->device = device;
1410 data->tbvpm = lpm;
1411 schedule_work(&data->worker);
1412 return 0;
1413 }
1414
1415 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1416 {
1417 struct dasd_eckd_private *private = device->private;
1418 unsigned long flags;
1419
1420 if (!private->fcx_max_data)
1421 private->fcx_max_data = get_fcx_max_data(device);
1422 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1423 dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1424 dasd_schedule_device_bh(device);
1425 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1426 }
1427
1428 static int dasd_eckd_read_features(struct dasd_device *device)
1429 {
1430 struct dasd_eckd_private *private = device->private;
1431 struct dasd_psf_prssd_data *prssdp;
1432 struct dasd_rssd_features *features;
1433 struct dasd_ccw_req *cqr;
1434 struct ccw1 *ccw;
1435 int rc;
1436
1437 memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1438 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1439 (sizeof(struct dasd_psf_prssd_data) +
1440 sizeof(struct dasd_rssd_features)),
1441 device);
1442 if (IS_ERR(cqr)) {
1443 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1444 "allocate initialization request");
1445 return PTR_ERR(cqr);
1446 }
1447 cqr->startdev = device;
1448 cqr->memdev = device;
1449 cqr->block = NULL;
1450 cqr->retries = 256;
1451 cqr->expires = 10 * HZ;
1452
1453 /* Prepare for Read Subsystem Data */
1454 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1455 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1456 prssdp->order = PSF_ORDER_PRSSD;
1457 prssdp->suborder = 0x41; /* Read Feature Codes */
1458 /* all other bytes of prssdp must be zero */
1459
1460 ccw = cqr->cpaddr;
1461 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1462 ccw->count = sizeof(struct dasd_psf_prssd_data);
1463 ccw->flags |= CCW_FLAG_CC;
1464 ccw->cda = (__u32)(addr_t) prssdp;
1465
1466 /* Read Subsystem Data - feature codes */
1467 features = (struct dasd_rssd_features *) (prssdp + 1);
1468 memset(features, 0, sizeof(struct dasd_rssd_features));
1469
1470 ccw++;
1471 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1472 ccw->count = sizeof(struct dasd_rssd_features);
1473 ccw->cda = (__u32)(addr_t) features;
1474
1475 cqr->buildclk = get_tod_clock();
1476 cqr->status = DASD_CQR_FILLED;
1477 rc = dasd_sleep_on(cqr);
1478 if (rc == 0) {
1479 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1480 features = (struct dasd_rssd_features *) (prssdp + 1);
1481 memcpy(&private->features, features,
1482 sizeof(struct dasd_rssd_features));
1483 } else
1484 dev_warn(&device->cdev->dev, "Reading device feature codes"
1485 " failed with rc=%d\n", rc);
1486 dasd_sfree_request(cqr, cqr->memdev);
1487 return rc;
1488 }
1489
1490
1491 /*
1492 * Build CP for Perform Subsystem Function - SSC.
1493 */
1494 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1495 int enable_pav)
1496 {
1497 struct dasd_ccw_req *cqr;
1498 struct dasd_psf_ssc_data *psf_ssc_data;
1499 struct ccw1 *ccw;
1500
1501 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1502 sizeof(struct dasd_psf_ssc_data),
1503 device);
1504
1505 if (IS_ERR(cqr)) {
1506 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1507 "Could not allocate PSF-SSC request");
1508 return cqr;
1509 }
1510 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1511 psf_ssc_data->order = PSF_ORDER_SSC;
1512 psf_ssc_data->suborder = 0xc0;
1513 if (enable_pav) {
1514 psf_ssc_data->suborder |= 0x08;
1515 psf_ssc_data->reserved[0] = 0x88;
1516 }
1517 ccw = cqr->cpaddr;
1518 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1519 ccw->cda = (__u32)(addr_t)psf_ssc_data;
1520 ccw->count = 66;
1521
1522 cqr->startdev = device;
1523 cqr->memdev = device;
1524 cqr->block = NULL;
1525 cqr->retries = 256;
1526 cqr->expires = 10*HZ;
1527 cqr->buildclk = get_tod_clock();
1528 cqr->status = DASD_CQR_FILLED;
1529 return cqr;
1530 }
1531
1532 /*
1533 * Perform Subsystem Function.
1534 * It is necessary to trigger CIO for channel revalidation since this
1535 * call might change behaviour of DASD devices.
1536 */
1537 static int
1538 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1539 unsigned long flags)
1540 {
1541 struct dasd_ccw_req *cqr;
1542 int rc;
1543
1544 cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1545 if (IS_ERR(cqr))
1546 return PTR_ERR(cqr);
1547
1548 /*
1549 * set flags e.g. turn on failfast, to prevent blocking
1550 * the calling function should handle failed requests
1551 */
1552 cqr->flags |= flags;
1553
1554 rc = dasd_sleep_on(cqr);
1555 if (!rc)
1556 /* trigger CIO to reprobe devices */
1557 css_schedule_reprobe();
1558 else if (cqr->intrc == -EAGAIN)
1559 rc = -EAGAIN;
1560
1561 dasd_sfree_request(cqr, cqr->memdev);
1562 return rc;
1563 }
1564
1565 /*
1566 * Valide storage server of current device.
1567 */
1568 static int dasd_eckd_validate_server(struct dasd_device *device,
1569 unsigned long flags)
1570 {
1571 struct dasd_eckd_private *private = device->private;
1572 int enable_pav, rc;
1573
1574 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1575 private->uid.type == UA_HYPER_PAV_ALIAS)
1576 return 0;
1577 if (dasd_nopav || MACHINE_IS_VM)
1578 enable_pav = 0;
1579 else
1580 enable_pav = 1;
1581 rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1582
1583 /* may be requested feature is not available on server,
1584 * therefore just report error and go ahead */
1585 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1586 "returned rc=%d", private->uid.ssid, rc);
1587 return rc;
1588 }
1589
1590 /*
1591 * worker to do a validate server in case of a lost pathgroup
1592 */
1593 static void dasd_eckd_do_validate_server(struct work_struct *work)
1594 {
1595 struct dasd_device *device = container_of(work, struct dasd_device,
1596 kick_validate);
1597 unsigned long flags = 0;
1598
1599 set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1600 if (dasd_eckd_validate_server(device, flags)
1601 == -EAGAIN) {
1602 /* schedule worker again if failed */
1603 schedule_work(&device->kick_validate);
1604 return;
1605 }
1606
1607 dasd_put_device(device);
1608 }
1609
1610 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1611 {
1612 dasd_get_device(device);
1613 /* exit if device not online or in offline processing */
1614 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1615 device->state < DASD_STATE_ONLINE) {
1616 dasd_put_device(device);
1617 return;
1618 }
1619 /* queue call to do_validate_server to the kernel event daemon. */
1620 if (!schedule_work(&device->kick_validate))
1621 dasd_put_device(device);
1622 }
1623
1624 /*
1625 * Check device characteristics.
1626 * If the device is accessible using ECKD discipline, the device is enabled.
1627 */
1628 static int
1629 dasd_eckd_check_characteristics(struct dasd_device *device)
1630 {
1631 struct dasd_eckd_private *private = device->private;
1632 struct dasd_block *block;
1633 struct dasd_uid temp_uid;
1634 int rc, i;
1635 int readonly;
1636 unsigned long value;
1637
1638 /* setup work queue for validate server*/
1639 INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1640 /* setup work queue for summary unit check */
1641 INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
1642
1643 if (!ccw_device_is_pathgroup(device->cdev)) {
1644 dev_warn(&device->cdev->dev,
1645 "A channel path group could not be established\n");
1646 return -EIO;
1647 }
1648 if (!ccw_device_is_multipath(device->cdev)) {
1649 dev_info(&device->cdev->dev,
1650 "The DASD is not operating in multipath mode\n");
1651 }
1652 if (!private) {
1653 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1654 if (!private) {
1655 dev_warn(&device->cdev->dev,
1656 "Allocating memory for private DASD data "
1657 "failed\n");
1658 return -ENOMEM;
1659 }
1660 device->private = private;
1661 } else {
1662 memset(private, 0, sizeof(*private));
1663 }
1664 /* Invalidate status of initial analysis. */
1665 private->init_cqr_status = -1;
1666 /* Set default cache operations. */
1667 private->attrib.operation = DASD_NORMAL_CACHE;
1668 private->attrib.nr_cyl = 0;
1669
1670 /* Read Configuration Data */
1671 rc = dasd_eckd_read_conf(device);
1672 if (rc)
1673 goto out_err1;
1674
1675 /* set some default values */
1676 device->default_expires = DASD_EXPIRES;
1677 device->default_retries = DASD_RETRIES;
1678 device->path_thrhld = DASD_ECKD_PATH_THRHLD;
1679 device->path_interval = DASD_ECKD_PATH_INTERVAL;
1680
1681 if (private->gneq) {
1682 value = 1;
1683 for (i = 0; i < private->gneq->timeout.value; i++)
1684 value = 10 * value;
1685 value = value * private->gneq->timeout.number;
1686 /* do not accept useless values */
1687 if (value != 0 && value <= DASD_EXPIRES_MAX)
1688 device->default_expires = value;
1689 }
1690
1691 dasd_eckd_get_uid(device, &temp_uid);
1692 if (temp_uid.type == UA_BASE_DEVICE) {
1693 block = dasd_alloc_block();
1694 if (IS_ERR(block)) {
1695 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1696 "could not allocate dasd "
1697 "block structure");
1698 rc = PTR_ERR(block);
1699 goto out_err1;
1700 }
1701 device->block = block;
1702 block->base = device;
1703 }
1704
1705 /* register lcu with alias handling, enable PAV */
1706 rc = dasd_alias_make_device_known_to_lcu(device);
1707 if (rc)
1708 goto out_err2;
1709
1710 dasd_eckd_validate_server(device, 0);
1711
1712 /* device may report different configuration data after LCU setup */
1713 rc = dasd_eckd_read_conf(device);
1714 if (rc)
1715 goto out_err3;
1716
1717 /* Read Feature Codes */
1718 dasd_eckd_read_features(device);
1719
1720 /* Read Device Characteristics */
1721 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1722 &private->rdc_data, 64);
1723 if (rc) {
1724 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1725 "Read device characteristic failed, rc=%d", rc);
1726 goto out_err3;
1727 }
1728
1729 if ((device->features & DASD_FEATURE_USERAW) &&
1730 !(private->rdc_data.facilities.RT_in_LR)) {
1731 dev_err(&device->cdev->dev, "The storage server does not "
1732 "support raw-track access\n");
1733 rc = -EINVAL;
1734 goto out_err3;
1735 }
1736
1737 /* find the valid cylinder size */
1738 if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1739 private->rdc_data.long_no_cyl)
1740 private->real_cyl = private->rdc_data.long_no_cyl;
1741 else
1742 private->real_cyl = private->rdc_data.no_cyl;
1743
1744 private->fcx_max_data = get_fcx_max_data(device);
1745
1746 readonly = dasd_device_is_ro(device);
1747 if (readonly)
1748 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1749
1750 dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1751 "with %d cylinders, %d heads, %d sectors%s\n",
1752 private->rdc_data.dev_type,
1753 private->rdc_data.dev_model,
1754 private->rdc_data.cu_type,
1755 private->rdc_data.cu_model.model,
1756 private->real_cyl,
1757 private->rdc_data.trk_per_cyl,
1758 private->rdc_data.sec_per_trk,
1759 readonly ? ", read-only device" : "");
1760 return 0;
1761
1762 out_err3:
1763 dasd_alias_disconnect_device_from_lcu(device);
1764 out_err2:
1765 dasd_free_block(device->block);
1766 device->block = NULL;
1767 out_err1:
1768 kfree(private->conf_data);
1769 kfree(device->private);
1770 device->private = NULL;
1771 return rc;
1772 }
1773
1774 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1775 {
1776 struct dasd_eckd_private *private = device->private;
1777 int i;
1778
1779 dasd_alias_disconnect_device_from_lcu(device);
1780 private->ned = NULL;
1781 private->sneq = NULL;
1782 private->vdsneq = NULL;
1783 private->gneq = NULL;
1784 private->conf_len = 0;
1785 for (i = 0; i < 8; i++) {
1786 kfree(device->path[i].conf_data);
1787 if ((__u8 *)device->path[i].conf_data ==
1788 private->conf_data) {
1789 private->conf_data = NULL;
1790 private->conf_len = 0;
1791 }
1792 device->path[i].conf_data = NULL;
1793 device->path[i].cssid = 0;
1794 device->path[i].ssid = 0;
1795 device->path[i].chpid = 0;
1796 }
1797 kfree(private->conf_data);
1798 private->conf_data = NULL;
1799 }
1800
1801 static struct dasd_ccw_req *
1802 dasd_eckd_analysis_ccw(struct dasd_device *device)
1803 {
1804 struct dasd_eckd_private *private = device->private;
1805 struct eckd_count *count_data;
1806 struct LO_eckd_data *LO_data;
1807 struct dasd_ccw_req *cqr;
1808 struct ccw1 *ccw;
1809 int cplength, datasize;
1810 int i;
1811
1812 cplength = 8;
1813 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1814 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1815 if (IS_ERR(cqr))
1816 return cqr;
1817 ccw = cqr->cpaddr;
1818 /* Define extent for the first 3 tracks. */
1819 define_extent(ccw++, cqr->data, 0, 2,
1820 DASD_ECKD_CCW_READ_COUNT, device, 0);
1821 LO_data = cqr->data + sizeof(struct DE_eckd_data);
1822 /* Locate record for the first 4 records on track 0. */
1823 ccw[-1].flags |= CCW_FLAG_CC;
1824 locate_record(ccw++, LO_data++, 0, 0, 4,
1825 DASD_ECKD_CCW_READ_COUNT, device, 0);
1826
1827 count_data = private->count_area;
1828 for (i = 0; i < 4; i++) {
1829 ccw[-1].flags |= CCW_FLAG_CC;
1830 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1831 ccw->flags = 0;
1832 ccw->count = 8;
1833 ccw->cda = (__u32)(addr_t) count_data;
1834 ccw++;
1835 count_data++;
1836 }
1837
1838 /* Locate record for the first record on track 2. */
1839 ccw[-1].flags |= CCW_FLAG_CC;
1840 locate_record(ccw++, LO_data++, 2, 0, 1,
1841 DASD_ECKD_CCW_READ_COUNT, device, 0);
1842 /* Read count ccw. */
1843 ccw[-1].flags |= CCW_FLAG_CC;
1844 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1845 ccw->flags = 0;
1846 ccw->count = 8;
1847 ccw->cda = (__u32)(addr_t) count_data;
1848
1849 cqr->block = NULL;
1850 cqr->startdev = device;
1851 cqr->memdev = device;
1852 cqr->retries = 255;
1853 cqr->buildclk = get_tod_clock();
1854 cqr->status = DASD_CQR_FILLED;
1855 return cqr;
1856 }
1857
1858 /* differentiate between 'no record found' and any other error */
1859 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1860 {
1861 char *sense;
1862 if (init_cqr->status == DASD_CQR_DONE)
1863 return INIT_CQR_OK;
1864 else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1865 init_cqr->status == DASD_CQR_FAILED) {
1866 sense = dasd_get_sense(&init_cqr->irb);
1867 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1868 return INIT_CQR_UNFORMATTED;
1869 else
1870 return INIT_CQR_ERROR;
1871 } else
1872 return INIT_CQR_ERROR;
1873 }
1874
1875 /*
1876 * This is the callback function for the init_analysis cqr. It saves
1877 * the status of the initial analysis ccw before it frees it and kicks
1878 * the device to continue the startup sequence. This will call
1879 * dasd_eckd_do_analysis again (if the devices has not been marked
1880 * for deletion in the meantime).
1881 */
1882 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1883 void *data)
1884 {
1885 struct dasd_device *device = init_cqr->startdev;
1886 struct dasd_eckd_private *private = device->private;
1887
1888 private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1889 dasd_sfree_request(init_cqr, device);
1890 dasd_kick_device(device);
1891 }
1892
1893 static int dasd_eckd_start_analysis(struct dasd_block *block)
1894 {
1895 struct dasd_ccw_req *init_cqr;
1896
1897 init_cqr = dasd_eckd_analysis_ccw(block->base);
1898 if (IS_ERR(init_cqr))
1899 return PTR_ERR(init_cqr);
1900 init_cqr->callback = dasd_eckd_analysis_callback;
1901 init_cqr->callback_data = NULL;
1902 init_cqr->expires = 5*HZ;
1903 /* first try without ERP, so we can later handle unformatted
1904 * devices as special case
1905 */
1906 clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1907 init_cqr->retries = 0;
1908 dasd_add_request_head(init_cqr);
1909 return -EAGAIN;
1910 }
1911
1912 static int dasd_eckd_end_analysis(struct dasd_block *block)
1913 {
1914 struct dasd_device *device = block->base;
1915 struct dasd_eckd_private *private = device->private;
1916 struct eckd_count *count_area;
1917 unsigned int sb, blk_per_trk;
1918 int status, i;
1919 struct dasd_ccw_req *init_cqr;
1920
1921 status = private->init_cqr_status;
1922 private->init_cqr_status = -1;
1923 if (status == INIT_CQR_ERROR) {
1924 /* try again, this time with full ERP */
1925 init_cqr = dasd_eckd_analysis_ccw(device);
1926 dasd_sleep_on(init_cqr);
1927 status = dasd_eckd_analysis_evaluation(init_cqr);
1928 dasd_sfree_request(init_cqr, device);
1929 }
1930
1931 if (device->features & DASD_FEATURE_USERAW) {
1932 block->bp_block = DASD_RAW_BLOCKSIZE;
1933 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1934 block->s2b_shift = 3;
1935 goto raw;
1936 }
1937
1938 if (status == INIT_CQR_UNFORMATTED) {
1939 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1940 return -EMEDIUMTYPE;
1941 } else if (status == INIT_CQR_ERROR) {
1942 dev_err(&device->cdev->dev,
1943 "Detecting the DASD disk layout failed because "
1944 "of an I/O error\n");
1945 return -EIO;
1946 }
1947
1948 private->uses_cdl = 1;
1949 /* Check Track 0 for Compatible Disk Layout */
1950 count_area = NULL;
1951 for (i = 0; i < 3; i++) {
1952 if (private->count_area[i].kl != 4 ||
1953 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1954 private->count_area[i].cyl != 0 ||
1955 private->count_area[i].head != count_area_head[i] ||
1956 private->count_area[i].record != count_area_rec[i]) {
1957 private->uses_cdl = 0;
1958 break;
1959 }
1960 }
1961 if (i == 3)
1962 count_area = &private->count_area[4];
1963
1964 if (private->uses_cdl == 0) {
1965 for (i = 0; i < 5; i++) {
1966 if ((private->count_area[i].kl != 0) ||
1967 (private->count_area[i].dl !=
1968 private->count_area[0].dl) ||
1969 private->count_area[i].cyl != 0 ||
1970 private->count_area[i].head != count_area_head[i] ||
1971 private->count_area[i].record != count_area_rec[i])
1972 break;
1973 }
1974 if (i == 5)
1975 count_area = &private->count_area[0];
1976 } else {
1977 if (private->count_area[3].record == 1)
1978 dev_warn(&device->cdev->dev,
1979 "Track 0 has no records following the VTOC\n");
1980 }
1981
1982 if (count_area != NULL && count_area->kl == 0) {
1983 /* we found notthing violating our disk layout */
1984 if (dasd_check_blocksize(count_area->dl) == 0)
1985 block->bp_block = count_area->dl;
1986 }
1987 if (block->bp_block == 0) {
1988 dev_warn(&device->cdev->dev,
1989 "The disk layout of the DASD is not supported\n");
1990 return -EMEDIUMTYPE;
1991 }
1992 block->s2b_shift = 0; /* bits to shift 512 to get a block */
1993 for (sb = 512; sb < block->bp_block; sb = sb << 1)
1994 block->s2b_shift++;
1995
1996 blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1997
1998 raw:
1999 block->blocks = (private->real_cyl *
2000 private->rdc_data.trk_per_cyl *
2001 blk_per_trk);
2002
2003 dev_info(&device->cdev->dev,
2004 "DASD with %d KB/block, %d KB total size, %d KB/track, "
2005 "%s\n", (block->bp_block >> 10),
2006 ((private->real_cyl *
2007 private->rdc_data.trk_per_cyl *
2008 blk_per_trk * (block->bp_block >> 9)) >> 1),
2009 ((blk_per_trk * block->bp_block) >> 10),
2010 private->uses_cdl ?
2011 "compatible disk layout" : "linux disk layout");
2012
2013 return 0;
2014 }
2015
2016 static int dasd_eckd_do_analysis(struct dasd_block *block)
2017 {
2018 struct dasd_eckd_private *private = block->base->private;
2019
2020 if (private->init_cqr_status < 0)
2021 return dasd_eckd_start_analysis(block);
2022 else
2023 return dasd_eckd_end_analysis(block);
2024 }
2025
2026 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2027 {
2028 return dasd_alias_add_device(device);
2029 };
2030
2031 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2032 {
2033 cancel_work_sync(&device->reload_device);
2034 cancel_work_sync(&device->kick_validate);
2035 return 0;
2036 };
2037
2038 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2039 {
2040 return dasd_alias_remove_device(device);
2041 };
2042
2043 static int
2044 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2045 {
2046 struct dasd_eckd_private *private = block->base->private;
2047
2048 if (dasd_check_blocksize(block->bp_block) == 0) {
2049 geo->sectors = recs_per_track(&private->rdc_data,
2050 0, block->bp_block);
2051 }
2052 geo->cylinders = private->rdc_data.no_cyl;
2053 geo->heads = private->rdc_data.trk_per_cyl;
2054 return 0;
2055 }
2056
2057 /*
2058 * Build the TCW request for the format check
2059 */
2060 static struct dasd_ccw_req *
2061 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2062 int enable_pav, struct eckd_count *fmt_buffer,
2063 int rpt)
2064 {
2065 struct dasd_eckd_private *start_priv;
2066 struct dasd_device *startdev = NULL;
2067 struct tidaw *last_tidaw = NULL;
2068 struct dasd_ccw_req *cqr;
2069 struct itcw *itcw;
2070 int itcw_size;
2071 int count;
2072 int rc;
2073 int i;
2074
2075 if (enable_pav)
2076 startdev = dasd_alias_get_start_dev(base);
2077
2078 if (!startdev)
2079 startdev = base;
2080
2081 start_priv = startdev->private;
2082
2083 count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2084
2085 /*
2086 * we're adding 'count' amount of tidaw to the itcw.
2087 * calculate the corresponding itcw_size
2088 */
2089 itcw_size = itcw_calc_size(0, count, 0);
2090
2091 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2092 if (IS_ERR(cqr))
2093 return cqr;
2094
2095 start_priv->count++;
2096
2097 itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2098 if (IS_ERR(itcw)) {
2099 rc = -EINVAL;
2100 goto out_err;
2101 }
2102
2103 cqr->cpaddr = itcw_get_tcw(itcw);
2104 rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2105 DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2106 sizeof(struct eckd_count),
2107 count * sizeof(struct eckd_count), 0, rpt);
2108 if (rc)
2109 goto out_err;
2110
2111 for (i = 0; i < count; i++) {
2112 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2113 sizeof(struct eckd_count));
2114 if (IS_ERR(last_tidaw)) {
2115 rc = -EINVAL;
2116 goto out_err;
2117 }
2118 }
2119
2120 last_tidaw->flags |= TIDAW_FLAGS_LAST;
2121 itcw_finalize(itcw);
2122
2123 cqr->cpmode = 1;
2124 cqr->startdev = startdev;
2125 cqr->memdev = startdev;
2126 cqr->basedev = base;
2127 cqr->retries = startdev->default_retries;
2128 cqr->expires = startdev->default_expires * HZ;
2129 cqr->buildclk = get_tod_clock();
2130 cqr->status = DASD_CQR_FILLED;
2131 /* Set flags to suppress output for expected errors */
2132 set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2133 set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2134
2135 return cqr;
2136
2137 out_err:
2138 dasd_sfree_request(cqr, startdev);
2139
2140 return ERR_PTR(rc);
2141 }
2142
2143 /*
2144 * Build the CCW request for the format check
2145 */
2146 static struct dasd_ccw_req *
2147 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2148 int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2149 {
2150 struct dasd_eckd_private *start_priv;
2151 struct dasd_eckd_private *base_priv;
2152 struct dasd_device *startdev = NULL;
2153 struct dasd_ccw_req *cqr;
2154 struct ccw1 *ccw;
2155 void *data;
2156 int cplength, datasize;
2157 int use_prefix;
2158 int count;
2159 int i;
2160
2161 if (enable_pav)
2162 startdev = dasd_alias_get_start_dev(base);
2163
2164 if (!startdev)
2165 startdev = base;
2166
2167 start_priv = startdev->private;
2168 base_priv = base->private;
2169
2170 count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2171
2172 use_prefix = base_priv->features.feature[8] & 0x01;
2173
2174 if (use_prefix) {
2175 cplength = 1;
2176 datasize = sizeof(struct PFX_eckd_data);
2177 } else {
2178 cplength = 2;
2179 datasize = sizeof(struct DE_eckd_data) +
2180 sizeof(struct LO_eckd_data);
2181 }
2182 cplength += count;
2183
2184 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2185 startdev);
2186 if (IS_ERR(cqr))
2187 return cqr;
2188
2189 start_priv->count++;
2190 data = cqr->data;
2191 ccw = cqr->cpaddr;
2192
2193 if (use_prefix) {
2194 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2195 DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2196 count, 0, 0);
2197 } else {
2198 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2199 DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2200
2201 data += sizeof(struct DE_eckd_data);
2202 ccw[-1].flags |= CCW_FLAG_CC;
2203
2204 locate_record(ccw++, data, fdata->start_unit, 0, count,
2205 DASD_ECKD_CCW_READ_COUNT, base, 0);
2206 }
2207
2208 for (i = 0; i < count; i++) {
2209 ccw[-1].flags |= CCW_FLAG_CC;
2210 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2211 ccw->flags = CCW_FLAG_SLI;
2212 ccw->count = 8;
2213 ccw->cda = (__u32)(addr_t) fmt_buffer;
2214 ccw++;
2215 fmt_buffer++;
2216 }
2217
2218 cqr->startdev = startdev;
2219 cqr->memdev = startdev;
2220 cqr->basedev = base;
2221 cqr->retries = DASD_RETRIES;
2222 cqr->expires = startdev->default_expires * HZ;
2223 cqr->buildclk = get_tod_clock();
2224 cqr->status = DASD_CQR_FILLED;
2225 /* Set flags to suppress output for expected errors */
2226 set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2227
2228 return cqr;
2229 }
2230
2231 static struct dasd_ccw_req *
2232 dasd_eckd_build_format(struct dasd_device *base,
2233 struct format_data_t *fdata,
2234 int enable_pav)
2235 {
2236 struct dasd_eckd_private *base_priv;
2237 struct dasd_eckd_private *start_priv;
2238 struct dasd_device *startdev = NULL;
2239 struct dasd_ccw_req *fcp;
2240 struct eckd_count *ect;
2241 struct ch_t address;
2242 struct ccw1 *ccw;
2243 void *data;
2244 int rpt;
2245 int cplength, datasize;
2246 int i, j;
2247 int intensity = 0;
2248 int r0_perm;
2249 int nr_tracks;
2250 int use_prefix;
2251
2252 if (enable_pav)
2253 startdev = dasd_alias_get_start_dev(base);
2254
2255 if (!startdev)
2256 startdev = base;
2257
2258 start_priv = startdev->private;
2259 base_priv = base->private;
2260
2261 rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2262
2263 nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2264
2265 /*
2266 * fdata->intensity is a bit string that tells us what to do:
2267 * Bit 0: write record zero
2268 * Bit 1: write home address, currently not supported
2269 * Bit 2: invalidate tracks
2270 * Bit 3: use OS/390 compatible disk layout (cdl)
2271 * Bit 4: do not allow storage subsystem to modify record zero
2272 * Only some bit combinations do make sense.
2273 */
2274 if (fdata->intensity & 0x10) {
2275 r0_perm = 0;
2276 intensity = fdata->intensity & ~0x10;
2277 } else {
2278 r0_perm = 1;
2279 intensity = fdata->intensity;
2280 }
2281
2282 use_prefix = base_priv->features.feature[8] & 0x01;
2283
2284 switch (intensity) {
2285 case 0x00: /* Normal format */
2286 case 0x08: /* Normal format, use cdl. */
2287 cplength = 2 + (rpt*nr_tracks);
2288 if (use_prefix)
2289 datasize = sizeof(struct PFX_eckd_data) +
2290 sizeof(struct LO_eckd_data) +
2291 rpt * nr_tracks * sizeof(struct eckd_count);
2292 else
2293 datasize = sizeof(struct DE_eckd_data) +
2294 sizeof(struct LO_eckd_data) +
2295 rpt * nr_tracks * sizeof(struct eckd_count);
2296 break;
2297 case 0x01: /* Write record zero and format track. */
2298 case 0x09: /* Write record zero and format track, use cdl. */
2299 cplength = 2 + rpt * nr_tracks;
2300 if (use_prefix)
2301 datasize = sizeof(struct PFX_eckd_data) +
2302 sizeof(struct LO_eckd_data) +
2303 sizeof(struct eckd_count) +
2304 rpt * nr_tracks * sizeof(struct eckd_count);
2305 else
2306 datasize = sizeof(struct DE_eckd_data) +
2307 sizeof(struct LO_eckd_data) +
2308 sizeof(struct eckd_count) +
2309 rpt * nr_tracks * sizeof(struct eckd_count);
2310 break;
2311 case 0x04: /* Invalidate track. */
2312 case 0x0c: /* Invalidate track, use cdl. */
2313 cplength = 3;
2314 if (use_prefix)
2315 datasize = sizeof(struct PFX_eckd_data) +
2316 sizeof(struct LO_eckd_data) +
2317 sizeof(struct eckd_count);
2318 else
2319 datasize = sizeof(struct DE_eckd_data) +
2320 sizeof(struct LO_eckd_data) +
2321 sizeof(struct eckd_count);
2322 break;
2323 default:
2324 dev_warn(&startdev->cdev->dev,
2325 "An I/O control call used incorrect flags 0x%x\n",
2326 fdata->intensity);
2327 return ERR_PTR(-EINVAL);
2328 }
2329 /* Allocate the format ccw request. */
2330 fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2331 datasize, startdev);
2332 if (IS_ERR(fcp))
2333 return fcp;
2334
2335 start_priv->count++;
2336 data = fcp->data;
2337 ccw = fcp->cpaddr;
2338
2339 switch (intensity & ~0x08) {
2340 case 0x00: /* Normal format. */
2341 if (use_prefix) {
2342 prefix(ccw++, (struct PFX_eckd_data *) data,
2343 fdata->start_unit, fdata->stop_unit,
2344 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2345 /* grant subsystem permission to format R0 */
2346 if (r0_perm)
2347 ((struct PFX_eckd_data *)data)
2348 ->define_extent.ga_extended |= 0x04;
2349 data += sizeof(struct PFX_eckd_data);
2350 } else {
2351 define_extent(ccw++, (struct DE_eckd_data *) data,
2352 fdata->start_unit, fdata->stop_unit,
2353 DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2354 /* grant subsystem permission to format R0 */
2355 if (r0_perm)
2356 ((struct DE_eckd_data *) data)
2357 ->ga_extended |= 0x04;
2358 data += sizeof(struct DE_eckd_data);
2359 }
2360 ccw[-1].flags |= CCW_FLAG_CC;
2361 locate_record(ccw++, (struct LO_eckd_data *) data,
2362 fdata->start_unit, 0, rpt*nr_tracks,
2363 DASD_ECKD_CCW_WRITE_CKD, base,
2364 fdata->blksize);
2365 data += sizeof(struct LO_eckd_data);
2366 break;
2367 case 0x01: /* Write record zero + format track. */
2368 if (use_prefix) {
2369 prefix(ccw++, (struct PFX_eckd_data *) data,
2370 fdata->start_unit, fdata->stop_unit,
2371 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2372 base, startdev);
2373 data += sizeof(struct PFX_eckd_data);
2374 } else {
2375 define_extent(ccw++, (struct DE_eckd_data *) data,
2376 fdata->start_unit, fdata->stop_unit,
2377 DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2378 data += sizeof(struct DE_eckd_data);
2379 }
2380 ccw[-1].flags |= CCW_FLAG_CC;
2381 locate_record(ccw++, (struct LO_eckd_data *) data,
2382 fdata->start_unit, 0, rpt * nr_tracks + 1,
2383 DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2384 base->block->bp_block);
2385 data += sizeof(struct LO_eckd_data);
2386 break;
2387 case 0x04: /* Invalidate track. */
2388 if (use_prefix) {
2389 prefix(ccw++, (struct PFX_eckd_data *) data,
2390 fdata->start_unit, fdata->stop_unit,
2391 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2392 data += sizeof(struct PFX_eckd_data);
2393 } else {
2394 define_extent(ccw++, (struct DE_eckd_data *) data,
2395 fdata->start_unit, fdata->stop_unit,
2396 DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2397 data += sizeof(struct DE_eckd_data);
2398 }
2399 ccw[-1].flags |= CCW_FLAG_CC;
2400 locate_record(ccw++, (struct LO_eckd_data *) data,
2401 fdata->start_unit, 0, 1,
2402 DASD_ECKD_CCW_WRITE_CKD, base, 8);
2403 data += sizeof(struct LO_eckd_data);
2404 break;
2405 }
2406
2407 for (j = 0; j < nr_tracks; j++) {
2408 /* calculate cylinder and head for the current track */
2409 set_ch_t(&address,
2410 (fdata->start_unit + j) /
2411 base_priv->rdc_data.trk_per_cyl,
2412 (fdata->start_unit + j) %
2413 base_priv->rdc_data.trk_per_cyl);
2414 if (intensity & 0x01) { /* write record zero */
2415 ect = (struct eckd_count *) data;
2416 data += sizeof(struct eckd_count);
2417 ect->cyl = address.cyl;
2418 ect->head = address.head;
2419 ect->record = 0;
2420 ect->kl = 0;
2421 ect->dl = 8;
2422 ccw[-1].flags |= CCW_FLAG_CC;
2423 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2424 ccw->flags = CCW_FLAG_SLI;
2425 ccw->count = 8;
2426 ccw->cda = (__u32)(addr_t) ect;
2427 ccw++;
2428 }
2429 if ((intensity & ~0x08) & 0x04) { /* erase track */
2430 ect = (struct eckd_count *) data;
2431 data += sizeof(struct eckd_count);
2432 ect->cyl = address.cyl;
2433 ect->head = address.head;
2434 ect->record = 1;
2435 ect->kl = 0;
2436 ect->dl = 0;
2437 ccw[-1].flags |= CCW_FLAG_CC;
2438 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2439 ccw->flags = CCW_FLAG_SLI;
2440 ccw->count = 8;
2441 ccw->cda = (__u32)(addr_t) ect;
2442 } else { /* write remaining records */
2443 for (i = 0; i < rpt; i++) {
2444 ect = (struct eckd_count *) data;
2445 data += sizeof(struct eckd_count);
2446 ect->cyl = address.cyl;
2447 ect->head = address.head;
2448 ect->record = i + 1;
2449 ect->kl = 0;
2450 ect->dl = fdata->blksize;
2451 /*
2452 * Check for special tracks 0-1
2453 * when formatting CDL
2454 */
2455 if ((intensity & 0x08) &&
2456 address.cyl == 0 && address.head == 0) {
2457 if (i < 3) {
2458 ect->kl = 4;
2459 ect->dl = sizes_trk0[i] - 4;
2460 }
2461 }
2462 if ((intensity & 0x08) &&
2463 address.cyl == 0 && address.head == 1) {
2464 ect->kl = 44;
2465 ect->dl = LABEL_SIZE - 44;
2466 }
2467 ccw[-1].flags |= CCW_FLAG_CC;
2468 if (i != 0 || j == 0)
2469 ccw->cmd_code =
2470 DASD_ECKD_CCW_WRITE_CKD;
2471 else
2472 ccw->cmd_code =
2473 DASD_ECKD_CCW_WRITE_CKD_MT;
2474 ccw->flags = CCW_FLAG_SLI;
2475 ccw->count = 8;
2476 ccw->cda = (__u32)(addr_t) ect;
2477 ccw++;
2478 }
2479 }
2480 }
2481
2482 fcp->startdev = startdev;
2483 fcp->memdev = startdev;
2484 fcp->basedev = base;
2485 fcp->retries = 256;
2486 fcp->expires = startdev->default_expires * HZ;
2487 fcp->buildclk = get_tod_clock();
2488 fcp->status = DASD_CQR_FILLED;
2489
2490 return fcp;
2491 }
2492
2493 /*
2494 * Wrapper function to build a CCW request depending on input data
2495 */
2496 static struct dasd_ccw_req *
2497 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2498 struct format_data_t *fdata, int enable_pav,
2499 int tpm, struct eckd_count *fmt_buffer, int rpt)
2500 {
2501 struct dasd_ccw_req *ccw_req;
2502
2503 if (!fmt_buffer) {
2504 ccw_req = dasd_eckd_build_format(base, fdata, enable_pav);
2505 } else {
2506 if (tpm)
2507 ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2508 enable_pav,
2509 fmt_buffer, rpt);
2510 else
2511 ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2512 fmt_buffer, rpt);
2513 }
2514
2515 return ccw_req;
2516 }
2517
2518 /*
2519 * Sanity checks on format_data
2520 */
2521 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2522 struct format_data_t *fdata)
2523 {
2524 struct dasd_eckd_private *private = base->private;
2525
2526 if (fdata->start_unit >=
2527 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2528 dev_warn(&base->cdev->dev,
2529 "Start track number %u used in formatting is too big\n",
2530 fdata->start_unit);
2531 return -EINVAL;
2532 }
2533 if (fdata->stop_unit >=
2534 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2535 dev_warn(&base->cdev->dev,
2536 "Stop track number %u used in formatting is too big\n",
2537 fdata->stop_unit);
2538 return -EINVAL;
2539 }
2540 if (fdata->start_unit > fdata->stop_unit) {
2541 dev_warn(&base->cdev->dev,
2542 "Start track %u used in formatting exceeds end track\n",
2543 fdata->start_unit);
2544 return -EINVAL;
2545 }
2546 if (dasd_check_blocksize(fdata->blksize) != 0) {
2547 dev_warn(&base->cdev->dev,
2548 "The DASD cannot be formatted with block size %u\n",
2549 fdata->blksize);
2550 return -EINVAL;
2551 }
2552 return 0;
2553 }
2554
2555 /*
2556 * This function will process format_data originally coming from an IOCTL
2557 */
2558 static int dasd_eckd_format_process_data(struct dasd_device *base,
2559 struct format_data_t *fdata,
2560 int enable_pav, int tpm,
2561 struct eckd_count *fmt_buffer, int rpt,
2562 struct irb *irb)
2563 {
2564 struct dasd_eckd_private *private = base->private;
2565 struct dasd_ccw_req *cqr, *n;
2566 struct list_head format_queue;
2567 struct dasd_device *device;
2568 char *sense = NULL;
2569 int old_start, old_stop, format_step;
2570 int step, retry;
2571 int rc;
2572
2573 rc = dasd_eckd_format_sanity_checks(base, fdata);
2574 if (rc)
2575 return rc;
2576
2577 INIT_LIST_HEAD(&format_queue);
2578
2579 old_start = fdata->start_unit;
2580 old_stop = fdata->stop_unit;
2581
2582 if (!tpm && fmt_buffer != NULL) {
2583 /* Command Mode / Format Check */
2584 format_step = 1;
2585 } else if (tpm && fmt_buffer != NULL) {
2586 /* Transport Mode / Format Check */
2587 format_step = DASD_CQR_MAX_CCW / rpt;
2588 } else {
2589 /* Normal Formatting */
2590 format_step = DASD_CQR_MAX_CCW /
2591 recs_per_track(&private->rdc_data, 0, fdata->blksize);
2592 }
2593
2594 do {
2595 retry = 0;
2596 while (fdata->start_unit <= old_stop) {
2597 step = fdata->stop_unit - fdata->start_unit + 1;
2598 if (step > format_step) {
2599 fdata->stop_unit =
2600 fdata->start_unit + format_step - 1;
2601 }
2602
2603 cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2604 enable_pav, tpm,
2605 fmt_buffer, rpt);
2606 if (IS_ERR(cqr)) {
2607 rc = PTR_ERR(cqr);
2608 if (rc == -ENOMEM) {
2609 if (list_empty(&format_queue))
2610 goto out;
2611 /*
2612 * not enough memory available, start
2613 * requests retry after first requests
2614 * were finished
2615 */
2616 retry = 1;
2617 break;
2618 }
2619 goto out_err;
2620 }
2621 list_add_tail(&cqr->blocklist, &format_queue);
2622
2623 if (fmt_buffer) {
2624 step = fdata->stop_unit - fdata->start_unit + 1;
2625 fmt_buffer += rpt * step;
2626 }
2627 fdata->start_unit = fdata->stop_unit + 1;
2628 fdata->stop_unit = old_stop;
2629 }
2630
2631 rc = dasd_sleep_on_queue(&format_queue);
2632
2633 out_err:
2634 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2635 device = cqr->startdev;
2636 private = device->private;
2637
2638 if (cqr->status == DASD_CQR_FAILED) {
2639 /*
2640 * Only get sense data if called by format
2641 * check
2642 */
2643 if (fmt_buffer && irb) {
2644 sense = dasd_get_sense(&cqr->irb);
2645 memcpy(irb, &cqr->irb, sizeof(*irb));
2646 }
2647 rc = -EIO;
2648 }
2649 list_del_init(&cqr->blocklist);
2650 dasd_sfree_request(cqr, device);
2651 private->count--;
2652 }
2653
2654 if (rc && rc != -EIO)
2655 goto out;
2656 if (rc == -EIO) {
2657 /*
2658 * In case fewer than the expected records are on the
2659 * track, we will most likely get a 'No Record Found'
2660 * error (in command mode) or a 'File Protected' error
2661 * (in transport mode). Those particular cases shouldn't
2662 * pass the -EIO to the IOCTL, therefore reset the rc
2663 * and continue.
2664 */
2665 if (sense &&
2666 (sense[1] & SNS1_NO_REC_FOUND ||
2667 sense[1] & SNS1_FILE_PROTECTED))
2668 retry = 1;
2669 else
2670 goto out;
2671 }
2672
2673 } while (retry);
2674
2675 out:
2676 fdata->start_unit = old_start;
2677 fdata->stop_unit = old_stop;
2678
2679 return rc;
2680 }
2681
2682 static int dasd_eckd_format_device(struct dasd_device *base,
2683 struct format_data_t *fdata, int enable_pav)
2684 {
2685 return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
2686 0, NULL);
2687 }
2688
2689 /*
2690 * Helper function to count consecutive records of a single track.
2691 */
2692 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
2693 int max)
2694 {
2695 int head;
2696 int i;
2697
2698 head = fmt_buffer[start].head;
2699
2700 /*
2701 * There are 3 conditions where we stop counting:
2702 * - if data reoccurs (same head and record may reoccur), which may
2703 * happen due to the way DASD_ECKD_CCW_READ_COUNT works
2704 * - when the head changes, because we're iterating over several tracks
2705 * then (DASD_ECKD_CCW_READ_COUNT_MT)
2706 * - when we've reached the end of sensible data in the buffer (the
2707 * record will be 0 then)
2708 */
2709 for (i = start; i < max; i++) {
2710 if (i > start) {
2711 if ((fmt_buffer[i].head == head &&
2712 fmt_buffer[i].record == 1) ||
2713 fmt_buffer[i].head != head ||
2714 fmt_buffer[i].record == 0)
2715 break;
2716 }
2717 }
2718
2719 return i - start;
2720 }
2721
2722 /*
2723 * Evaluate a given range of tracks. Data like number of records, blocksize,
2724 * record ids, and key length are compared with expected data.
2725 *
2726 * If a mismatch occurs, the corresponding error bit is set, as well as
2727 * additional information, depending on the error.
2728 */
2729 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
2730 struct format_check_t *cdata,
2731 int rpt_max, int rpt_exp,
2732 int trk_per_cyl, int tpm)
2733 {
2734 struct ch_t geo;
2735 int max_entries;
2736 int count = 0;
2737 int trkcount;
2738 int blksize;
2739 int pos = 0;
2740 int i, j;
2741 int kl;
2742
2743 trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2744 max_entries = trkcount * rpt_max;
2745
2746 for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
2747 /* Calculate the correct next starting position in the buffer */
2748 if (tpm) {
2749 while (fmt_buffer[pos].record == 0 &&
2750 fmt_buffer[pos].dl == 0) {
2751 if (pos++ > max_entries)
2752 break;
2753 }
2754 } else {
2755 if (i != cdata->expect.start_unit)
2756 pos += rpt_max - count;
2757 }
2758
2759 /* Calculate the expected geo values for the current track */
2760 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
2761
2762 /* Count and check number of records */
2763 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
2764
2765 if (count < rpt_exp) {
2766 cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
2767 break;
2768 }
2769 if (count > rpt_exp) {
2770 cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
2771 break;
2772 }
2773
2774 for (j = 0; j < count; j++, pos++) {
2775 blksize = cdata->expect.blksize;
2776 kl = 0;
2777
2778 /*
2779 * Set special values when checking CDL formatted
2780 * devices.
2781 */
2782 if ((cdata->expect.intensity & 0x08) &&
2783 geo.cyl == 0 && geo.head == 0) {
2784 if (j < 3) {
2785 blksize = sizes_trk0[j] - 4;
2786 kl = 4;
2787 }
2788 }
2789 if ((cdata->expect.intensity & 0x08) &&
2790 geo.cyl == 0 && geo.head == 1) {
2791 blksize = LABEL_SIZE - 44;
2792 kl = 44;
2793 }
2794
2795 /* Check blocksize */
2796 if (fmt_buffer[pos].dl != blksize) {
2797 cdata->result = DASD_FMT_ERR_BLKSIZE;
2798 goto out;
2799 }
2800 /* Check if key length is 0 */
2801 if (fmt_buffer[pos].kl != kl) {
2802 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
2803 goto out;
2804 }
2805 /* Check if record_id is correct */
2806 if (fmt_buffer[pos].cyl != geo.cyl ||
2807 fmt_buffer[pos].head != geo.head ||
2808 fmt_buffer[pos].record != (j + 1)) {
2809 cdata->result = DASD_FMT_ERR_RECORD_ID;
2810 goto out;
2811 }
2812 }
2813 }
2814
2815 out:
2816 /*
2817 * In case of no errors, we need to decrease by one
2818 * to get the correct positions.
2819 */
2820 if (!cdata->result) {
2821 i--;
2822 pos--;
2823 }
2824
2825 cdata->unit = i;
2826 cdata->num_records = count;
2827 cdata->rec = fmt_buffer[pos].record;
2828 cdata->blksize = fmt_buffer[pos].dl;
2829 cdata->key_length = fmt_buffer[pos].kl;
2830 }
2831
2832 /*
2833 * Check the format of a range of tracks of a DASD.
2834 */
2835 static int dasd_eckd_check_device_format(struct dasd_device *base,
2836 struct format_check_t *cdata,
2837 int enable_pav)
2838 {
2839 struct dasd_eckd_private *private = base->private;
2840 struct eckd_count *fmt_buffer;
2841 struct irb irb;
2842 int rpt_max, rpt_exp;
2843 int fmt_buffer_size;
2844 int trk_per_cyl;
2845 int trkcount;
2846 int tpm = 0;
2847 int rc;
2848
2849 trk_per_cyl = private->rdc_data.trk_per_cyl;
2850
2851 /* Get maximum and expected amount of records per track */
2852 rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
2853 rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
2854
2855 trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2856 fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
2857
2858 fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
2859 if (!fmt_buffer)
2860 return -ENOMEM;
2861
2862 /*
2863 * A certain FICON feature subset is needed to operate in transport
2864 * mode. Additionally, the support for transport mode is implicitly
2865 * checked by comparing the buffer size with fcx_max_data. As long as
2866 * the buffer size is smaller we can operate in transport mode and
2867 * process multiple tracks. If not, only one track at once is being
2868 * processed using command mode.
2869 */
2870 if ((private->features.feature[40] & 0x04) &&
2871 fmt_buffer_size <= private->fcx_max_data)
2872 tpm = 1;
2873
2874 rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
2875 tpm, fmt_buffer, rpt_max, &irb);
2876 if (rc && rc != -EIO)
2877 goto out;
2878 if (rc == -EIO) {
2879 /*
2880 * If our first attempt with transport mode enabled comes back
2881 * with an incorrect length error, we're going to retry the
2882 * check with command mode.
2883 */
2884 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
2885 tpm = 0;
2886 rc = dasd_eckd_format_process_data(base, &cdata->expect,
2887 enable_pav, tpm,
2888 fmt_buffer, rpt_max,
2889 &irb);
2890 if (rc)
2891 goto out;
2892 } else {
2893 goto out;
2894 }
2895 }
2896
2897 dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
2898 trk_per_cyl, tpm);
2899
2900 out:
2901 kfree(fmt_buffer);
2902
2903 return rc;
2904 }
2905
2906 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2907 {
2908 if (cqr->retries < 0) {
2909 cqr->status = DASD_CQR_FAILED;
2910 return;
2911 }
2912 cqr->status = DASD_CQR_FILLED;
2913 if (cqr->block && (cqr->startdev != cqr->block->base)) {
2914 dasd_eckd_reset_ccw_to_base_io(cqr);
2915 cqr->startdev = cqr->block->base;
2916 cqr->lpm = dasd_path_get_opm(cqr->block->base);
2917 }
2918 };
2919
2920 static dasd_erp_fn_t
2921 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2922 {
2923 struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2924 struct ccw_device *cdev = device->cdev;
2925
2926 switch (cdev->id.cu_type) {
2927 case 0x3990:
2928 case 0x2105:
2929 case 0x2107:
2930 case 0x1750:
2931 return dasd_3990_erp_action;
2932 case 0x9343:
2933 case 0x3880:
2934 default:
2935 return dasd_default_erp_action;
2936 }
2937 }
2938
2939 static dasd_erp_fn_t
2940 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2941 {
2942 return dasd_default_erp_postaction;
2943 }
2944
2945 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2946 struct dasd_ccw_req *cqr,
2947 struct irb *irb)
2948 {
2949 char mask;
2950 char *sense = NULL;
2951 struct dasd_eckd_private *private = device->private;
2952
2953 /* first of all check for state change pending interrupt */
2954 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2955 if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2956 /*
2957 * for alias only, not in offline processing
2958 * and only if not suspended
2959 */
2960 if (!device->block && private->lcu &&
2961 device->state == DASD_STATE_ONLINE &&
2962 !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2963 !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2964 /* schedule worker to reload device */
2965 dasd_reload_device(device);
2966 }
2967 dasd_generic_handle_state_change(device);
2968 return;
2969 }
2970
2971 sense = dasd_get_sense(irb);
2972 if (!sense)
2973 return;
2974
2975 /* summary unit check */
2976 if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2977 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2978 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
2979 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2980 "eckd suc: device already notified");
2981 return;
2982 }
2983 sense = dasd_get_sense(irb);
2984 if (!sense) {
2985 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2986 "eckd suc: no reason code available");
2987 clear_bit(DASD_FLAG_SUC, &device->flags);
2988 return;
2989
2990 }
2991 private->suc_reason = sense[8];
2992 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
2993 "eckd handle summary unit check: reason",
2994 private->suc_reason);
2995 dasd_get_device(device);
2996 if (!schedule_work(&device->suc_work))
2997 dasd_put_device(device);
2998
2999 return;
3000 }
3001
3002 /* service information message SIM */
3003 if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3004 ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3005 dasd_3990_erp_handle_sim(device, sense);
3006 return;
3007 }
3008
3009 /* loss of device reservation is handled via base devices only
3010 * as alias devices may be used with several bases
3011 */
3012 if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3013 (sense[7] == 0x3F) &&
3014 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3015 test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3016 if (device->features & DASD_FEATURE_FAILONSLCK)
3017 set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3018 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3019 dev_err(&device->cdev->dev,
3020 "The device reservation was lost\n");
3021 }
3022 }
3023
3024 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3025 struct dasd_device *startdev,
3026 struct dasd_block *block,
3027 struct request *req,
3028 sector_t first_rec,
3029 sector_t last_rec,
3030 sector_t first_trk,
3031 sector_t last_trk,
3032 unsigned int first_offs,
3033 unsigned int last_offs,
3034 unsigned int blk_per_trk,
3035 unsigned int blksize)
3036 {
3037 struct dasd_eckd_private *private;
3038 unsigned long *idaws;
3039 struct LO_eckd_data *LO_data;
3040 struct dasd_ccw_req *cqr;
3041 struct ccw1 *ccw;
3042 struct req_iterator iter;
3043 struct bio_vec bv;
3044 char *dst;
3045 unsigned int off;
3046 int count, cidaw, cplength, datasize;
3047 sector_t recid;
3048 unsigned char cmd, rcmd;
3049 int use_prefix;
3050 struct dasd_device *basedev;
3051
3052 basedev = block->base;
3053 private = basedev->private;
3054 if (rq_data_dir(req) == READ)
3055 cmd = DASD_ECKD_CCW_READ_MT;
3056 else if (rq_data_dir(req) == WRITE)
3057 cmd = DASD_ECKD_CCW_WRITE_MT;
3058 else
3059 return ERR_PTR(-EINVAL);
3060
3061 /* Check struct bio and count the number of blocks for the request. */
3062 count = 0;
3063 cidaw = 0;
3064 rq_for_each_segment(bv, req, iter) {
3065 if (bv.bv_len & (blksize - 1))
3066 /* Eckd can only do full blocks. */
3067 return ERR_PTR(-EINVAL);
3068 count += bv.bv_len >> (block->s2b_shift + 9);
3069 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3070 cidaw += bv.bv_len >> (block->s2b_shift + 9);
3071 }
3072 /* Paranoia. */
3073 if (count != last_rec - first_rec + 1)
3074 return ERR_PTR(-EINVAL);
3075
3076 /* use the prefix command if available */
3077 use_prefix = private->features.feature[8] & 0x01;
3078 if (use_prefix) {
3079 /* 1x prefix + number of blocks */
3080 cplength = 2 + count;
3081 /* 1x prefix + cidaws*sizeof(long) */
3082 datasize = sizeof(struct PFX_eckd_data) +
3083 sizeof(struct LO_eckd_data) +
3084 cidaw * sizeof(unsigned long);
3085 } else {
3086 /* 1x define extent + 1x locate record + number of blocks */
3087 cplength = 2 + count;
3088 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3089 datasize = sizeof(struct DE_eckd_data) +
3090 sizeof(struct LO_eckd_data) +
3091 cidaw * sizeof(unsigned long);
3092 }
3093 /* Find out the number of additional locate record ccws for cdl. */
3094 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3095 if (last_rec >= 2*blk_per_trk)
3096 count = 2*blk_per_trk - first_rec;
3097 cplength += count;
3098 datasize += count*sizeof(struct LO_eckd_data);
3099 }
3100 /* Allocate the ccw request. */
3101 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3102 startdev);
3103 if (IS_ERR(cqr))
3104 return cqr;
3105 ccw = cqr->cpaddr;
3106 /* First ccw is define extent or prefix. */
3107 if (use_prefix) {
3108 if (prefix(ccw++, cqr->data, first_trk,
3109 last_trk, cmd, basedev, startdev) == -EAGAIN) {
3110 /* Clock not in sync and XRC is enabled.
3111 * Try again later.
3112 */
3113 dasd_sfree_request(cqr, startdev);
3114 return ERR_PTR(-EAGAIN);
3115 }
3116 idaws = (unsigned long *) (cqr->data +
3117 sizeof(struct PFX_eckd_data));
3118 } else {
3119 if (define_extent(ccw++, cqr->data, first_trk,
3120 last_trk, cmd, basedev, 0) == -EAGAIN) {
3121 /* Clock not in sync and XRC is enabled.
3122 * Try again later.
3123 */
3124 dasd_sfree_request(cqr, startdev);
3125 return ERR_PTR(-EAGAIN);
3126 }
3127 idaws = (unsigned long *) (cqr->data +
3128 sizeof(struct DE_eckd_data));
3129 }
3130 /* Build locate_record+read/write/ccws. */
3131 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
3132 recid = first_rec;
3133 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
3134 /* Only standard blocks so there is just one locate record. */
3135 ccw[-1].flags |= CCW_FLAG_CC;
3136 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
3137 last_rec - recid + 1, cmd, basedev, blksize);
3138 }
3139 rq_for_each_segment(bv, req, iter) {
3140 dst = page_address(bv.bv_page) + bv.bv_offset;
3141 if (dasd_page_cache) {
3142 char *copy = kmem_cache_alloc(dasd_page_cache,
3143 GFP_DMA | __GFP_NOWARN);
3144 if (copy && rq_data_dir(req) == WRITE)
3145 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
3146 if (copy)
3147 dst = copy + bv.bv_offset;
3148 }
3149 for (off = 0; off < bv.bv_len; off += blksize) {
3150 sector_t trkid = recid;
3151 unsigned int recoffs = sector_div(trkid, blk_per_trk);
3152 rcmd = cmd;
3153 count = blksize;
3154 /* Locate record for cdl special block ? */
3155 if (private->uses_cdl && recid < 2*blk_per_trk) {
3156 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
3157 rcmd |= 0x8;
3158 count = dasd_eckd_cdl_reclen(recid);
3159 if (count < blksize &&
3160 rq_data_dir(req) == READ)
3161 memset(dst + count, 0xe5,
3162 blksize - count);
3163 }
3164 ccw[-1].flags |= CCW_FLAG_CC;
3165 locate_record(ccw++, LO_data++,
3166 trkid, recoffs + 1,
3167 1, rcmd, basedev, count);
3168 }
3169 /* Locate record for standard blocks ? */
3170 if (private->uses_cdl && recid == 2*blk_per_trk) {
3171 ccw[-1].flags |= CCW_FLAG_CC;
3172 locate_record(ccw++, LO_data++,
3173 trkid, recoffs + 1,
3174 last_rec - recid + 1,
3175 cmd, basedev, count);
3176 }
3177 /* Read/write ccw. */
3178 ccw[-1].flags |= CCW_FLAG_CC;
3179 ccw->cmd_code = rcmd;
3180 ccw->count = count;
3181 if (idal_is_needed(dst, blksize)) {
3182 ccw->cda = (__u32)(addr_t) idaws;
3183 ccw->flags = CCW_FLAG_IDA;
3184 idaws = idal_create_words(idaws, dst, blksize);
3185 } else {
3186 ccw->cda = (__u32)(addr_t) dst;
3187 ccw->flags = 0;
3188 }
3189 ccw++;
3190 dst += blksize;
3191 recid++;
3192 }
3193 }
3194 if (blk_noretry_request(req) ||
3195 block->base->features & DASD_FEATURE_FAILFAST)
3196 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3197 cqr->startdev = startdev;
3198 cqr->memdev = startdev;
3199 cqr->block = block;
3200 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
3201 cqr->lpm = dasd_path_get_ppm(startdev);
3202 cqr->retries = startdev->default_retries;
3203 cqr->buildclk = get_tod_clock();
3204 cqr->status = DASD_CQR_FILLED;
3205 return cqr;
3206 }
3207
3208 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
3209 struct dasd_device *startdev,
3210 struct dasd_block *block,
3211 struct request *req,
3212 sector_t first_rec,
3213 sector_t last_rec,
3214 sector_t first_trk,
3215 sector_t last_trk,
3216 unsigned int first_offs,
3217 unsigned int last_offs,
3218 unsigned int blk_per_trk,
3219 unsigned int blksize)
3220 {
3221 unsigned long *idaws;
3222 struct dasd_ccw_req *cqr;
3223 struct ccw1 *ccw;
3224 struct req_iterator iter;
3225 struct bio_vec bv;
3226 char *dst, *idaw_dst;
3227 unsigned int cidaw, cplength, datasize;
3228 unsigned int tlf;
3229 sector_t recid;
3230 unsigned char cmd;
3231 struct dasd_device *basedev;
3232 unsigned int trkcount, count, count_to_trk_end;
3233 unsigned int idaw_len, seg_len, part_len, len_to_track_end;
3234 unsigned char new_track, end_idaw;
3235 sector_t trkid;
3236 unsigned int recoffs;
3237
3238 basedev = block->base;
3239 if (rq_data_dir(req) == READ)
3240 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3241 else if (rq_data_dir(req) == WRITE)
3242 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3243 else
3244 return ERR_PTR(-EINVAL);
3245
3246 /* Track based I/O needs IDAWs for each page, and not just for
3247 * 64 bit addresses. We need additional idals for pages
3248 * that get filled from two tracks, so we use the number
3249 * of records as upper limit.
3250 */
3251 cidaw = last_rec - first_rec + 1;
3252 trkcount = last_trk - first_trk + 1;
3253
3254 /* 1x prefix + one read/write ccw per track */
3255 cplength = 1 + trkcount;
3256
3257 datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
3258
3259 /* Allocate the ccw request. */
3260 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3261 startdev);
3262 if (IS_ERR(cqr))
3263 return cqr;
3264 ccw = cqr->cpaddr;
3265 /* transfer length factor: how many bytes to read from the last track */
3266 if (first_trk == last_trk)
3267 tlf = last_offs - first_offs + 1;
3268 else
3269 tlf = last_offs + 1;
3270 tlf *= blksize;
3271
3272 if (prefix_LRE(ccw++, cqr->data, first_trk,
3273 last_trk, cmd, basedev, startdev,
3274 1 /* format */, first_offs + 1,
3275 trkcount, blksize,
3276 tlf) == -EAGAIN) {
3277 /* Clock not in sync and XRC is enabled.
3278 * Try again later.
3279 */
3280 dasd_sfree_request(cqr, startdev);
3281 return ERR_PTR(-EAGAIN);
3282 }
3283
3284 /*
3285 * The translation of request into ccw programs must meet the
3286 * following conditions:
3287 * - all idaws but the first and the last must address full pages
3288 * (or 2K blocks on 31-bit)
3289 * - the scope of a ccw and it's idal ends with the track boundaries
3290 */
3291 idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
3292 recid = first_rec;
3293 new_track = 1;
3294 end_idaw = 0;
3295 len_to_track_end = 0;
3296 idaw_dst = NULL;
3297 idaw_len = 0;
3298 rq_for_each_segment(bv, req, iter) {
3299 dst = page_address(bv.bv_page) + bv.bv_offset;
3300 seg_len = bv.bv_len;
3301 while (seg_len) {
3302 if (new_track) {
3303 trkid = recid;
3304 recoffs = sector_div(trkid, blk_per_trk);
3305 count_to_trk_end = blk_per_trk - recoffs;
3306 count = min((last_rec - recid + 1),
3307 (sector_t)count_to_trk_end);
3308 len_to_track_end = count * blksize;
3309 ccw[-1].flags |= CCW_FLAG_CC;
3310 ccw->cmd_code = cmd;
3311 ccw->count = len_to_track_end;
3312 ccw->cda = (__u32)(addr_t)idaws;
3313 ccw->flags = CCW_FLAG_IDA;
3314 ccw++;
3315 recid += count;
3316 new_track = 0;
3317 /* first idaw for a ccw may start anywhere */
3318 if (!idaw_dst)
3319 idaw_dst = dst;
3320 }
3321 /* If we start a new idaw, we must make sure that it
3322 * starts on an IDA_BLOCK_SIZE boundary.
3323 * If we continue an idaw, we must make sure that the
3324 * current segment begins where the so far accumulated
3325 * idaw ends
3326 */
3327 if (!idaw_dst) {
3328 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
3329 dasd_sfree_request(cqr, startdev);
3330 return ERR_PTR(-ERANGE);
3331 } else
3332 idaw_dst = dst;
3333 }
3334 if ((idaw_dst + idaw_len) != dst) {
3335 dasd_sfree_request(cqr, startdev);
3336 return ERR_PTR(-ERANGE);
3337 }
3338 part_len = min(seg_len, len_to_track_end);
3339 seg_len -= part_len;
3340 dst += part_len;
3341 idaw_len += part_len;
3342 len_to_track_end -= part_len;
3343 /* collected memory area ends on an IDA_BLOCK border,
3344 * -> create an idaw
3345 * idal_create_words will handle cases where idaw_len
3346 * is larger then IDA_BLOCK_SIZE
3347 */
3348 if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
3349 end_idaw = 1;
3350 /* We also need to end the idaw at track end */
3351 if (!len_to_track_end) {
3352 new_track = 1;
3353 end_idaw = 1;
3354 }
3355 if (end_idaw) {
3356 idaws = idal_create_words(idaws, idaw_dst,
3357 idaw_len);
3358 idaw_dst = NULL;
3359 idaw_len = 0;
3360 end_idaw = 0;
3361 }
3362 }
3363 }
3364
3365 if (blk_noretry_request(req) ||
3366 block->base->features & DASD_FEATURE_FAILFAST)
3367 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3368 cqr->startdev = startdev;
3369 cqr->memdev = startdev;
3370 cqr->block = block;
3371 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
3372 cqr->lpm = dasd_path_get_ppm(startdev);
3373 cqr->retries = startdev->default_retries;
3374 cqr->buildclk = get_tod_clock();
3375 cqr->status = DASD_CQR_FILLED;
3376 return cqr;
3377 }
3378
3379 static int prepare_itcw(struct itcw *itcw,
3380 unsigned int trk, unsigned int totrk, int cmd,
3381 struct dasd_device *basedev,
3382 struct dasd_device *startdev,
3383 unsigned int rec_on_trk, int count,
3384 unsigned int blksize,
3385 unsigned int total_data_size,
3386 unsigned int tlf,
3387 unsigned int blk_per_trk)
3388 {
3389 struct PFX_eckd_data pfxdata;
3390 struct dasd_eckd_private *basepriv, *startpriv;
3391 struct DE_eckd_data *dedata;
3392 struct LRE_eckd_data *lredata;
3393 struct dcw *dcw;
3394
3395 u32 begcyl, endcyl;
3396 u16 heads, beghead, endhead;
3397 u8 pfx_cmd;
3398
3399 int rc = 0;
3400 int sector = 0;
3401 int dn, d;
3402
3403
3404 /* setup prefix data */
3405 basepriv = basedev->private;
3406 startpriv = startdev->private;
3407 dedata = &pfxdata.define_extent;
3408 lredata = &pfxdata.locate_record;
3409
3410 memset(&pfxdata, 0, sizeof(pfxdata));
3411 pfxdata.format = 1; /* PFX with LRE */
3412 pfxdata.base_address = basepriv->ned->unit_addr;
3413 pfxdata.base_lss = basepriv->ned->ID;
3414 pfxdata.validity.define_extent = 1;
3415
3416 /* private uid is kept up to date, conf_data may be outdated */
3417 if (startpriv->uid.type != UA_BASE_DEVICE) {
3418 pfxdata.validity.verify_base = 1;
3419 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
3420 pfxdata.validity.hyper_pav = 1;
3421 }
3422
3423 switch (cmd) {
3424 case DASD_ECKD_CCW_READ_TRACK_DATA:
3425 dedata->mask.perm = 0x1;
3426 dedata->attributes.operation = basepriv->attrib.operation;
3427 dedata->blk_size = blksize;
3428 dedata->ga_extended |= 0x42;
3429 lredata->operation.orientation = 0x0;
3430 lredata->operation.operation = 0x0C;
3431 lredata->auxiliary.check_bytes = 0x01;
3432 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3433 break;
3434 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
3435 dedata->mask.perm = 0x02;
3436 dedata->attributes.operation = basepriv->attrib.operation;
3437 dedata->blk_size = blksize;
3438 rc = check_XRC(NULL, dedata, basedev);
3439 dedata->ga_extended |= 0x42;
3440 lredata->operation.orientation = 0x0;
3441 lredata->operation.operation = 0x3F;
3442 lredata->extended_operation = 0x23;
3443 lredata->auxiliary.check_bytes = 0x2;
3444 /*
3445 * If XRC is supported the System Time Stamp is set. The
3446 * validity of the time stamp must be reflected in the prefix
3447 * data as well.
3448 */
3449 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
3450 pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
3451 pfx_cmd = DASD_ECKD_CCW_PFX;
3452 break;
3453 case DASD_ECKD_CCW_READ_COUNT_MT:
3454 dedata->mask.perm = 0x1;
3455 dedata->attributes.operation = DASD_BYPASS_CACHE;
3456 dedata->ga_extended |= 0x42;
3457 dedata->blk_size = blksize;
3458 lredata->operation.orientation = 0x2;
3459 lredata->operation.operation = 0x16;
3460 lredata->auxiliary.check_bytes = 0x01;
3461 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3462 break;
3463 default:
3464 DBF_DEV_EVENT(DBF_ERR, basedev,
3465 "prepare itcw, unknown opcode 0x%x", cmd);
3466 BUG();
3467 break;
3468 }
3469 if (rc)
3470 return rc;
3471
3472 dedata->attributes.mode = 0x3; /* ECKD */
3473
3474 heads = basepriv->rdc_data.trk_per_cyl;
3475 begcyl = trk / heads;
3476 beghead = trk % heads;
3477 endcyl = totrk / heads;
3478 endhead = totrk % heads;
3479
3480 /* check for sequential prestage - enhance cylinder range */
3481 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3482 dedata->attributes.operation == DASD_SEQ_ACCESS) {
3483
3484 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3485 endcyl += basepriv->attrib.nr_cyl;
3486 else
3487 endcyl = (basepriv->real_cyl - 1);
3488 }
3489
3490 set_ch_t(&dedata->beg_ext, begcyl, beghead);
3491 set_ch_t(&dedata->end_ext, endcyl, endhead);
3492
3493 dedata->ep_format = 0x20; /* records per track is valid */
3494 dedata->ep_rec_per_track = blk_per_trk;
3495
3496 if (rec_on_trk) {
3497 switch (basepriv->rdc_data.dev_type) {
3498 case 0x3390:
3499 dn = ceil_quot(blksize + 6, 232);
3500 d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3501 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3502 break;
3503 case 0x3380:
3504 d = 7 + ceil_quot(blksize + 12, 32);
3505 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3506 break;
3507 }
3508 }
3509
3510 if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
3511 lredata->auxiliary.length_valid = 0;
3512 lredata->auxiliary.length_scope = 0;
3513 lredata->sector = 0xff;
3514 } else {
3515 lredata->auxiliary.length_valid = 1;
3516 lredata->auxiliary.length_scope = 1;
3517 lredata->sector = sector;
3518 }
3519 lredata->auxiliary.imbedded_ccw_valid = 1;
3520 lredata->length = tlf;
3521 lredata->imbedded_ccw = cmd;
3522 lredata->count = count;
3523 set_ch_t(&lredata->seek_addr, begcyl, beghead);
3524 lredata->search_arg.cyl = lredata->seek_addr.cyl;
3525 lredata->search_arg.head = lredata->seek_addr.head;
3526 lredata->search_arg.record = rec_on_trk;
3527
3528 dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3529 &pfxdata, sizeof(pfxdata), total_data_size);
3530 return PTR_RET(dcw);
3531 }
3532
3533 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3534 struct dasd_device *startdev,
3535 struct dasd_block *block,
3536 struct request *req,
3537 sector_t first_rec,
3538 sector_t last_rec,
3539 sector_t first_trk,
3540 sector_t last_trk,
3541 unsigned int first_offs,
3542 unsigned int last_offs,
3543 unsigned int blk_per_trk,
3544 unsigned int blksize)
3545 {
3546 struct dasd_ccw_req *cqr;
3547 struct req_iterator iter;
3548 struct bio_vec bv;
3549 char *dst;
3550 unsigned int trkcount, ctidaw;
3551 unsigned char cmd;
3552 struct dasd_device *basedev;
3553 unsigned int tlf;
3554 struct itcw *itcw;
3555 struct tidaw *last_tidaw = NULL;
3556 int itcw_op;
3557 size_t itcw_size;
3558 u8 tidaw_flags;
3559 unsigned int seg_len, part_len, len_to_track_end;
3560 unsigned char new_track;
3561 sector_t recid, trkid;
3562 unsigned int offs;
3563 unsigned int count, count_to_trk_end;
3564 int ret;
3565
3566 basedev = block->base;
3567 if (rq_data_dir(req) == READ) {
3568 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3569 itcw_op = ITCW_OP_READ;
3570 } else if (rq_data_dir(req) == WRITE) {
3571 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3572 itcw_op = ITCW_OP_WRITE;
3573 } else
3574 return ERR_PTR(-EINVAL);
3575
3576 /* trackbased I/O needs address all memory via TIDAWs,
3577 * not just for 64 bit addresses. This allows us to map
3578 * each segment directly to one tidaw.
3579 * In the case of write requests, additional tidaws may
3580 * be needed when a segment crosses a track boundary.
3581 */
3582 trkcount = last_trk - first_trk + 1;
3583 ctidaw = 0;
3584 rq_for_each_segment(bv, req, iter) {
3585 ++ctidaw;
3586 }
3587 if (rq_data_dir(req) == WRITE)
3588 ctidaw += (last_trk - first_trk);
3589
3590 /* Allocate the ccw request. */
3591 itcw_size = itcw_calc_size(0, ctidaw, 0);
3592 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3593 if (IS_ERR(cqr))
3594 return cqr;
3595
3596 /* transfer length factor: how many bytes to read from the last track */
3597 if (first_trk == last_trk)
3598 tlf = last_offs - first_offs + 1;
3599 else
3600 tlf = last_offs + 1;
3601 tlf *= blksize;
3602
3603 itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3604 if (IS_ERR(itcw)) {
3605 ret = -EINVAL;
3606 goto out_error;
3607 }
3608 cqr->cpaddr = itcw_get_tcw(itcw);
3609 if (prepare_itcw(itcw, first_trk, last_trk,
3610 cmd, basedev, startdev,
3611 first_offs + 1,
3612 trkcount, blksize,
3613 (last_rec - first_rec + 1) * blksize,
3614 tlf, blk_per_trk) == -EAGAIN) {
3615 /* Clock not in sync and XRC is enabled.
3616 * Try again later.
3617 */
3618 ret = -EAGAIN;
3619 goto out_error;
3620 }
3621 len_to_track_end = 0;
3622 /*
3623 * A tidaw can address 4k of memory, but must not cross page boundaries
3624 * We can let the block layer handle this by setting
3625 * blk_queue_segment_boundary to page boundaries and
3626 * blk_max_segment_size to page size when setting up the request queue.
3627 * For write requests, a TIDAW must not cross track boundaries, because
3628 * we have to set the CBC flag on the last tidaw for each track.
3629 */
3630 if (rq_data_dir(req) == WRITE) {
3631 new_track = 1;
3632 recid = first_rec;
3633 rq_for_each_segment(bv, req, iter) {
3634 dst = page_address(bv.bv_page) + bv.bv_offset;
3635 seg_len = bv.bv_len;
3636 while (seg_len) {
3637 if (new_track) {
3638 trkid = recid;
3639 offs = sector_div(trkid, blk_per_trk);
3640 count_to_trk_end = blk_per_trk - offs;
3641 count = min((last_rec - recid + 1),
3642 (sector_t)count_to_trk_end);
3643 len_to_track_end = count * blksize;
3644 recid += count;
3645 new_track = 0;
3646 }
3647 part_len = min(seg_len, len_to_track_end);
3648 seg_len -= part_len;
3649 len_to_track_end -= part_len;
3650 /* We need to end the tidaw at track end */
3651 if (!len_to_track_end) {
3652 new_track = 1;
3653 tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3654 } else
3655 tidaw_flags = 0;
3656 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3657 dst, part_len);
3658 if (IS_ERR(last_tidaw)) {
3659 ret = -EINVAL;
3660 goto out_error;
3661 }
3662 dst += part_len;
3663 }
3664 }
3665 } else {
3666 rq_for_each_segment(bv, req, iter) {
3667 dst = page_address(bv.bv_page) + bv.bv_offset;
3668 last_tidaw = itcw_add_tidaw(itcw, 0x00,
3669 dst, bv.bv_len);
3670 if (IS_ERR(last_tidaw)) {
3671 ret = -EINVAL;
3672 goto out_error;
3673 }
3674 }
3675 }
3676 last_tidaw->flags |= TIDAW_FLAGS_LAST;
3677 last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3678 itcw_finalize(itcw);
3679
3680 if (blk_noretry_request(req) ||
3681 block->base->features & DASD_FEATURE_FAILFAST)
3682 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3683 cqr->cpmode = 1;
3684 cqr->startdev = startdev;
3685 cqr->memdev = startdev;
3686 cqr->block = block;
3687 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
3688 cqr->lpm = dasd_path_get_ppm(startdev);
3689 cqr->retries = startdev->default_retries;
3690 cqr->buildclk = get_tod_clock();
3691 cqr->status = DASD_CQR_FILLED;
3692 return cqr;
3693 out_error:
3694 dasd_sfree_request(cqr, startdev);
3695 return ERR_PTR(ret);
3696 }
3697
3698 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3699 struct dasd_block *block,
3700 struct request *req)
3701 {
3702 int cmdrtd, cmdwtd;
3703 int use_prefix;
3704 int fcx_multitrack;
3705 struct dasd_eckd_private *private;
3706 struct dasd_device *basedev;
3707 sector_t first_rec, last_rec;
3708 sector_t first_trk, last_trk;
3709 unsigned int first_offs, last_offs;
3710 unsigned int blk_per_trk, blksize;
3711 int cdlspecial;
3712 unsigned int data_size;
3713 struct dasd_ccw_req *cqr;
3714
3715 basedev = block->base;
3716 private = basedev->private;
3717
3718 /* Calculate number of blocks/records per track. */
3719 blksize = block->bp_block;
3720 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3721 if (blk_per_trk == 0)
3722 return ERR_PTR(-EINVAL);
3723 /* Calculate record id of first and last block. */
3724 first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3725 first_offs = sector_div(first_trk, blk_per_trk);
3726 last_rec = last_trk =
3727 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3728 last_offs = sector_div(last_trk, blk_per_trk);
3729 cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3730
3731 fcx_multitrack = private->features.feature[40] & 0x20;
3732 data_size = blk_rq_bytes(req);
3733 if (data_size % blksize)
3734 return ERR_PTR(-EINVAL);
3735 /* tpm write request add CBC data on each track boundary */
3736 if (rq_data_dir(req) == WRITE)
3737 data_size += (last_trk - first_trk) * 4;
3738
3739 /* is read track data and write track data in command mode supported? */
3740 cmdrtd = private->features.feature[9] & 0x20;
3741 cmdwtd = private->features.feature[12] & 0x40;
3742 use_prefix = private->features.feature[8] & 0x01;
3743
3744 cqr = NULL;
3745 if (cdlspecial || dasd_page_cache) {
3746 /* do nothing, just fall through to the cmd mode single case */
3747 } else if ((data_size <= private->fcx_max_data)
3748 && (fcx_multitrack || (first_trk == last_trk))) {
3749 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3750 first_rec, last_rec,
3751 first_trk, last_trk,
3752 first_offs, last_offs,
3753 blk_per_trk, blksize);
3754 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3755 (PTR_ERR(cqr) != -ENOMEM))
3756 cqr = NULL;
3757 } else if (use_prefix &&
3758 (((rq_data_dir(req) == READ) && cmdrtd) ||
3759 ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3760 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3761 first_rec, last_rec,
3762 first_trk, last_trk,
3763 first_offs, last_offs,
3764 blk_per_trk, blksize);
3765 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3766 (PTR_ERR(cqr) != -ENOMEM))
3767 cqr = NULL;
3768 }
3769 if (!cqr)
3770 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3771 first_rec, last_rec,
3772 first_trk, last_trk,
3773 first_offs, last_offs,
3774 blk_per_trk, blksize);
3775 return cqr;
3776 }
3777
3778 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
3779 struct dasd_block *block,
3780 struct request *req)
3781 {
3782 sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3783 unsigned int seg_len, len_to_track_end;
3784 unsigned int cidaw, cplength, datasize;
3785 sector_t first_trk, last_trk, sectors;
3786 struct dasd_eckd_private *base_priv;
3787 struct dasd_device *basedev;
3788 struct req_iterator iter;
3789 struct dasd_ccw_req *cqr;
3790 unsigned int first_offs;
3791 unsigned int trkcount;
3792 unsigned long *idaws;
3793 unsigned int size;
3794 unsigned char cmd;
3795 struct bio_vec bv;
3796 struct ccw1 *ccw;
3797 int use_prefix;
3798 void *data;
3799 char *dst;
3800
3801 /*
3802 * raw track access needs to be mutiple of 64k and on 64k boundary
3803 * For read requests we can fix an incorrect alignment by padding
3804 * the request with dummy pages.
3805 */
3806 start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3807 end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3808 DASD_RAW_SECTORS_PER_TRACK;
3809 end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3810 DASD_RAW_SECTORS_PER_TRACK;
3811 basedev = block->base;
3812 if ((start_padding_sectors || end_padding_sectors) &&
3813 (rq_data_dir(req) == WRITE)) {
3814 DBF_DEV_EVENT(DBF_ERR, basedev,
3815 "raw write not track aligned (%lu,%lu) req %p",
3816 start_padding_sectors, end_padding_sectors, req);
3817 return ERR_PTR(-EINVAL);
3818 }
3819
3820 first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3821 last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3822 DASD_RAW_SECTORS_PER_TRACK;
3823 trkcount = last_trk - first_trk + 1;
3824 first_offs = 0;
3825
3826 if (rq_data_dir(req) == READ)
3827 cmd = DASD_ECKD_CCW_READ_TRACK;
3828 else if (rq_data_dir(req) == WRITE)
3829 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3830 else
3831 return ERR_PTR(-EINVAL);
3832
3833 /*
3834 * Raw track based I/O needs IDAWs for each page,
3835 * and not just for 64 bit addresses.
3836 */
3837 cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3838
3839 /*
3840 * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
3841 * of extended parameter. This is needed for write full track.
3842 */
3843 base_priv = basedev->private;
3844 use_prefix = base_priv->features.feature[8] & 0x01;
3845 if (use_prefix) {
3846 cplength = 1 + trkcount;
3847 size = sizeof(struct PFX_eckd_data) + 2;
3848 } else {
3849 cplength = 2 + trkcount;
3850 size = sizeof(struct DE_eckd_data) +
3851 sizeof(struct LRE_eckd_data) + 2;
3852 }
3853 size = ALIGN(size, 8);
3854
3855 datasize = size + cidaw * sizeof(unsigned long);
3856
3857 /* Allocate the ccw request. */
3858 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3859 datasize, startdev);
3860 if (IS_ERR(cqr))
3861 return cqr;
3862
3863 ccw = cqr->cpaddr;
3864 data = cqr->data;
3865
3866 if (use_prefix) {
3867 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
3868 startdev, 1, first_offs + 1, trkcount, 0, 0);
3869 } else {
3870 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
3871 ccw[-1].flags |= CCW_FLAG_CC;
3872
3873 data += sizeof(struct DE_eckd_data);
3874 locate_record_ext(ccw++, data, first_trk, first_offs + 1,
3875 trkcount, cmd, basedev, 0, 0);
3876 }
3877
3878 idaws = (unsigned long *)(cqr->data + size);
3879 len_to_track_end = 0;
3880 if (start_padding_sectors) {
3881 ccw[-1].flags |= CCW_FLAG_CC;
3882 ccw->cmd_code = cmd;
3883 /* maximum 3390 track size */
3884 ccw->count = 57326;
3885 /* 64k map to one track */
3886 len_to_track_end = 65536 - start_padding_sectors * 512;
3887 ccw->cda = (__u32)(addr_t)idaws;
3888 ccw->flags |= CCW_FLAG_IDA;
3889 ccw->flags |= CCW_FLAG_SLI;
3890 ccw++;
3891 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3892 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3893 }
3894 rq_for_each_segment(bv, req, iter) {
3895 dst = page_address(bv.bv_page) + bv.bv_offset;
3896 seg_len = bv.bv_len;
3897 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3898 memset(dst, 0, seg_len);
3899 if (!len_to_track_end) {
3900 ccw[-1].flags |= CCW_FLAG_CC;
3901 ccw->cmd_code = cmd;
3902 /* maximum 3390 track size */
3903 ccw->count = 57326;
3904 /* 64k map to one track */
3905 len_to_track_end = 65536;
3906 ccw->cda = (__u32)(addr_t)idaws;
3907 ccw->flags |= CCW_FLAG_IDA;
3908 ccw->flags |= CCW_FLAG_SLI;
3909 ccw++;
3910 }
3911 len_to_track_end -= seg_len;
3912 idaws = idal_create_words(idaws, dst, seg_len);
3913 }
3914 for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3915 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3916 if (blk_noretry_request(req) ||
3917 block->base->features & DASD_FEATURE_FAILFAST)
3918 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3919 cqr->startdev = startdev;
3920 cqr->memdev = startdev;
3921 cqr->block = block;
3922 cqr->expires = startdev->default_expires * HZ;
3923 cqr->lpm = dasd_path_get_ppm(startdev);
3924 cqr->retries = startdev->default_retries;
3925 cqr->buildclk = get_tod_clock();
3926 cqr->status = DASD_CQR_FILLED;
3927
3928 return cqr;
3929 }
3930
3931
3932 static int
3933 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3934 {
3935 struct dasd_eckd_private *private;
3936 struct ccw1 *ccw;
3937 struct req_iterator iter;
3938 struct bio_vec bv;
3939 char *dst, *cda;
3940 unsigned int blksize, blk_per_trk, off;
3941 sector_t recid;
3942 int status;
3943
3944 if (!dasd_page_cache)
3945 goto out;
3946 private = cqr->block->base->private;
3947 blksize = cqr->block->bp_block;
3948 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3949 recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3950 ccw = cqr->cpaddr;
3951 /* Skip over define extent & locate record. */
3952 ccw++;
3953 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3954 ccw++;
3955 rq_for_each_segment(bv, req, iter) {
3956 dst = page_address(bv.bv_page) + bv.bv_offset;
3957 for (off = 0; off < bv.bv_len; off += blksize) {
3958 /* Skip locate record. */
3959 if (private->uses_cdl && recid <= 2*blk_per_trk)
3960 ccw++;
3961 if (dst) {
3962 if (ccw->flags & CCW_FLAG_IDA)
3963 cda = *((char **)((addr_t) ccw->cda));
3964 else
3965 cda = (char *)((addr_t) ccw->cda);
3966 if (dst != cda) {
3967 if (rq_data_dir(req) == READ)
3968 memcpy(dst, cda, bv.bv_len);
3969 kmem_cache_free(dasd_page_cache,
3970 (void *)((addr_t)cda & PAGE_MASK));
3971 }
3972 dst = NULL;
3973 }
3974 ccw++;
3975 recid++;
3976 }
3977 }
3978 out:
3979 status = cqr->status == DASD_CQR_DONE;
3980 dasd_sfree_request(cqr, cqr->memdev);
3981 return status;
3982 }
3983
3984 /*
3985 * Modify ccw/tcw in cqr so it can be started on a base device.
3986 *
3987 * Note that this is not enough to restart the cqr!
3988 * Either reset cqr->startdev as well (summary unit check handling)
3989 * or restart via separate cqr (as in ERP handling).
3990 */
3991 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3992 {
3993 struct ccw1 *ccw;
3994 struct PFX_eckd_data *pfxdata;
3995 struct tcw *tcw;
3996 struct tccb *tccb;
3997 struct dcw *dcw;
3998
3999 if (cqr->cpmode == 1) {
4000 tcw = cqr->cpaddr;
4001 tccb = tcw_get_tccb(tcw);
4002 dcw = (struct dcw *)&tccb->tca[0];
4003 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4004 pfxdata->validity.verify_base = 0;
4005 pfxdata->validity.hyper_pav = 0;
4006 } else {
4007 ccw = cqr->cpaddr;
4008 pfxdata = cqr->data;
4009 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4010 pfxdata->validity.verify_base = 0;
4011 pfxdata->validity.hyper_pav = 0;
4012 }
4013 }
4014 }
4015
4016 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4017
4018 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4019 struct dasd_block *block,
4020 struct request *req)
4021 {
4022 struct dasd_eckd_private *private;
4023 struct dasd_device *startdev;
4024 unsigned long flags;
4025 struct dasd_ccw_req *cqr;
4026
4027 startdev = dasd_alias_get_start_dev(base);
4028 if (!startdev)
4029 startdev = base;
4030 private = startdev->private;
4031 if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4032 return ERR_PTR(-EBUSY);
4033
4034 spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4035 private->count++;
4036 if ((base->features & DASD_FEATURE_USERAW))
4037 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4038 else
4039 cqr = dasd_eckd_build_cp(startdev, block, req);
4040 if (IS_ERR(cqr))
4041 private->count--;
4042 spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4043 return cqr;
4044 }
4045
4046 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4047 struct request *req)
4048 {
4049 struct dasd_eckd_private *private;
4050 unsigned long flags;
4051
4052 spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4053 private = cqr->memdev->private;
4054 private->count--;
4055 spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4056 return dasd_eckd_free_cp(cqr, req);
4057 }
4058
4059 static int
4060 dasd_eckd_fill_info(struct dasd_device * device,
4061 struct dasd_information2_t * info)
4062 {
4063 struct dasd_eckd_private *private = device->private;
4064
4065 info->label_block = 2;
4066 info->FBA_layout = private->uses_cdl ? 0 : 1;
4067 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4068 info->characteristics_size = sizeof(private->rdc_data);
4069 memcpy(info->characteristics, &private->rdc_data,
4070 sizeof(private->rdc_data));
4071 info->confdata_size = min((unsigned long)private->conf_len,
4072 sizeof(info->configuration_data));
4073 memcpy(info->configuration_data, private->conf_data,
4074 info->confdata_size);
4075 return 0;
4076 }
4077
4078 /*
4079 * SECTION: ioctl functions for eckd devices.
4080 */
4081
4082 /*
4083 * Release device ioctl.
4084 * Buils a channel programm to releases a prior reserved
4085 * (see dasd_eckd_reserve) device.
4086 */
4087 static int
4088 dasd_eckd_release(struct dasd_device *device)
4089 {
4090 struct dasd_ccw_req *cqr;
4091 int rc;
4092 struct ccw1 *ccw;
4093 int useglobal;
4094
4095 if (!capable(CAP_SYS_ADMIN))
4096 return -EACCES;
4097
4098 useglobal = 0;
4099 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
4100 if (IS_ERR(cqr)) {
4101 mutex_lock(&dasd_reserve_mutex);
4102 useglobal = 1;
4103 cqr = &dasd_reserve_req->cqr;
4104 memset(cqr, 0, sizeof(*cqr));
4105 memset(&dasd_reserve_req->ccw, 0,
4106 sizeof(dasd_reserve_req->ccw));
4107 cqr->cpaddr = &dasd_reserve_req->ccw;
4108 cqr->data = &dasd_reserve_req->data;
4109 cqr->magic = DASD_ECKD_MAGIC;
4110 }
4111 ccw = cqr->cpaddr;
4112 ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
4113 ccw->flags |= CCW_FLAG_SLI;
4114 ccw->count = 32;
4115 ccw->cda = (__u32)(addr_t) cqr->data;
4116 cqr->startdev = device;
4117 cqr->memdev = device;
4118 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4119 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4120 cqr->retries = 2; /* set retry counter to enable basic ERP */
4121 cqr->expires = 2 * HZ;
4122 cqr->buildclk = get_tod_clock();
4123 cqr->status = DASD_CQR_FILLED;
4124
4125 rc = dasd_sleep_on_immediatly(cqr);
4126 if (!rc)
4127 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4128
4129 if (useglobal)
4130 mutex_unlock(&dasd_reserve_mutex);
4131 else
4132 dasd_sfree_request(cqr, cqr->memdev);
4133 return rc;
4134 }
4135
4136 /*
4137 * Reserve device ioctl.
4138 * Options are set to 'synchronous wait for interrupt' and
4139 * 'timeout the request'. This leads to a terminate IO if
4140 * the interrupt is outstanding for a certain time.
4141 */
4142 static int
4143 dasd_eckd_reserve(struct dasd_device *device)
4144 {
4145 struct dasd_ccw_req *cqr;
4146 int rc;
4147 struct ccw1 *ccw;
4148 int useglobal;
4149
4150 if (!capable(CAP_SYS_ADMIN))
4151 return -EACCES;
4152
4153 useglobal = 0;
4154 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
4155 if (IS_ERR(cqr)) {
4156 mutex_lock(&dasd_reserve_mutex);
4157 useglobal = 1;
4158 cqr = &dasd_reserve_req->cqr;
4159 memset(cqr, 0, sizeof(*cqr));
4160 memset(&dasd_reserve_req->ccw, 0,
4161 sizeof(dasd_reserve_req->ccw));
4162 cqr->cpaddr = &dasd_reserve_req->ccw;
4163 cqr->data = &dasd_reserve_req->data;
4164 cqr->magic = DASD_ECKD_MAGIC;
4165 }
4166 ccw = cqr->cpaddr;
4167 ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
4168 ccw->flags |= CCW_FLAG_SLI;
4169 ccw->count = 32;
4170 ccw->cda = (__u32)(addr_t) cqr->data;
4171 cqr->startdev = device;
4172 cqr->memdev = device;
4173 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4174 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4175 cqr->retries = 2; /* set retry counter to enable basic ERP */
4176 cqr->expires = 2 * HZ;
4177 cqr->buildclk = get_tod_clock();
4178 cqr->status = DASD_CQR_FILLED;
4179
4180 rc = dasd_sleep_on_immediatly(cqr);
4181 if (!rc)
4182 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4183
4184 if (useglobal)
4185 mutex_unlock(&dasd_reserve_mutex);
4186 else
4187 dasd_sfree_request(cqr, cqr->memdev);
4188 return rc;
4189 }
4190
4191 /*
4192 * Steal lock ioctl - unconditional reserve device.
4193 * Buils a channel programm to break a device's reservation.
4194 * (unconditional reserve)
4195 */
4196 static int
4197 dasd_eckd_steal_lock(struct dasd_device *device)
4198 {
4199 struct dasd_ccw_req *cqr;
4200 int rc;
4201 struct ccw1 *ccw;
4202 int useglobal;
4203
4204 if (!capable(CAP_SYS_ADMIN))
4205 return -EACCES;
4206
4207 useglobal = 0;
4208 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
4209 if (IS_ERR(cqr)) {
4210 mutex_lock(&dasd_reserve_mutex);
4211 useglobal = 1;
4212 cqr = &dasd_reserve_req->cqr;
4213 memset(cqr, 0, sizeof(*cqr));
4214 memset(&dasd_reserve_req->ccw, 0,
4215 sizeof(dasd_reserve_req->ccw));
4216 cqr->cpaddr = &dasd_reserve_req->ccw;
4217 cqr->data = &dasd_reserve_req->data;
4218 cqr->magic = DASD_ECKD_MAGIC;
4219 }
4220 ccw = cqr->cpaddr;
4221 ccw->cmd_code = DASD_ECKD_CCW_SLCK;
4222 ccw->flags |= CCW_FLAG_SLI;
4223 ccw->count = 32;
4224 ccw->cda = (__u32)(addr_t) cqr->data;
4225 cqr->startdev = device;
4226 cqr->memdev = device;
4227 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4228 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4229 cqr->retries = 2; /* set retry counter to enable basic ERP */
4230 cqr->expires = 2 * HZ;
4231 cqr->buildclk = get_tod_clock();
4232 cqr->status = DASD_CQR_FILLED;
4233
4234 rc = dasd_sleep_on_immediatly(cqr);
4235 if (!rc)
4236 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4237
4238 if (useglobal)
4239 mutex_unlock(&dasd_reserve_mutex);
4240 else
4241 dasd_sfree_request(cqr, cqr->memdev);
4242 return rc;
4243 }
4244
4245 /*
4246 * SNID - Sense Path Group ID
4247 * This ioctl may be used in situations where I/O is stalled due to
4248 * a reserve, so if the normal dasd_smalloc_request fails, we use the
4249 * preallocated dasd_reserve_req.
4250 */
4251 static int dasd_eckd_snid(struct dasd_device *device,
4252 void __user *argp)
4253 {
4254 struct dasd_ccw_req *cqr;
4255 int rc;
4256 struct ccw1 *ccw;
4257 int useglobal;
4258 struct dasd_snid_ioctl_data usrparm;
4259
4260 if (!capable(CAP_SYS_ADMIN))
4261 return -EACCES;
4262
4263 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4264 return -EFAULT;
4265
4266 useglobal = 0;
4267 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
4268 sizeof(struct dasd_snid_data), device);
4269 if (IS_ERR(cqr)) {
4270 mutex_lock(&dasd_reserve_mutex);
4271 useglobal = 1;
4272 cqr = &dasd_reserve_req->cqr;
4273 memset(cqr, 0, sizeof(*cqr));
4274 memset(&dasd_reserve_req->ccw, 0,
4275 sizeof(dasd_reserve_req->ccw));
4276 cqr->cpaddr = &dasd_reserve_req->ccw;
4277 cqr->data = &dasd_reserve_req->data;
4278 cqr->magic = DASD_ECKD_MAGIC;
4279 }
4280 ccw = cqr->cpaddr;
4281 ccw->cmd_code = DASD_ECKD_CCW_SNID;
4282 ccw->flags |= CCW_FLAG_SLI;
4283 ccw->count = 12;
4284 ccw->cda = (__u32)(addr_t) cqr->data;
4285 cqr->startdev = device;
4286 cqr->memdev = device;
4287 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4288 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4289 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
4290 cqr->retries = 5;
4291 cqr->expires = 10 * HZ;
4292 cqr->buildclk = get_tod_clock();
4293 cqr->status = DASD_CQR_FILLED;
4294 cqr->lpm = usrparm.path_mask;
4295
4296 rc = dasd_sleep_on_immediatly(cqr);
4297 /* verify that I/O processing didn't modify the path mask */
4298 if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
4299 rc = -EIO;
4300 if (!rc) {
4301 usrparm.data = *((struct dasd_snid_data *)cqr->data);
4302 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
4303 rc = -EFAULT;
4304 }
4305
4306 if (useglobal)
4307 mutex_unlock(&dasd_reserve_mutex);
4308 else
4309 dasd_sfree_request(cqr, cqr->memdev);
4310 return rc;
4311 }
4312
4313 /*
4314 * Read performance statistics
4315 */
4316 static int
4317 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
4318 {
4319 struct dasd_psf_prssd_data *prssdp;
4320 struct dasd_rssd_perf_stats_t *stats;
4321 struct dasd_ccw_req *cqr;
4322 struct ccw1 *ccw;
4323 int rc;
4324
4325 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
4326 (sizeof(struct dasd_psf_prssd_data) +
4327 sizeof(struct dasd_rssd_perf_stats_t)),
4328 device);
4329 if (IS_ERR(cqr)) {
4330 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4331 "Could not allocate initialization request");
4332 return PTR_ERR(cqr);
4333 }
4334 cqr->startdev = device;
4335 cqr->memdev = device;
4336 cqr->retries = 0;
4337 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4338 cqr->expires = 10 * HZ;
4339
4340 /* Prepare for Read Subsystem Data */
4341 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4342 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4343 prssdp->order = PSF_ORDER_PRSSD;
4344 prssdp->suborder = 0x01; /* Performance Statistics */
4345 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
4346
4347 ccw = cqr->cpaddr;
4348 ccw->cmd_code = DASD_ECKD_CCW_PSF;
4349 ccw->count = sizeof(struct dasd_psf_prssd_data);
4350 ccw->flags |= CCW_FLAG_CC;
4351 ccw->cda = (__u32)(addr_t) prssdp;
4352
4353 /* Read Subsystem Data - Performance Statistics */
4354 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4355 memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
4356
4357 ccw++;
4358 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4359 ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
4360 ccw->cda = (__u32)(addr_t) stats;
4361
4362 cqr->buildclk = get_tod_clock();
4363 cqr->status = DASD_CQR_FILLED;
4364 rc = dasd_sleep_on(cqr);
4365 if (rc == 0) {
4366 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4367 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4368 if (copy_to_user(argp, stats,
4369 sizeof(struct dasd_rssd_perf_stats_t)))
4370 rc = -EFAULT;
4371 }
4372 dasd_sfree_request(cqr, cqr->memdev);
4373 return rc;
4374 }
4375
4376 /*
4377 * Get attributes (cache operations)
4378 * Returnes the cache attributes used in Define Extend (DE).
4379 */
4380 static int
4381 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
4382 {
4383 struct dasd_eckd_private *private = device->private;
4384 struct attrib_data_t attrib = private->attrib;
4385 int rc;
4386
4387 if (!capable(CAP_SYS_ADMIN))
4388 return -EACCES;
4389 if (!argp)
4390 return -EINVAL;
4391
4392 rc = 0;
4393 if (copy_to_user(argp, (long *) &attrib,
4394 sizeof(struct attrib_data_t)))
4395 rc = -EFAULT;
4396
4397 return rc;
4398 }
4399
4400 /*
4401 * Set attributes (cache operations)
4402 * Stores the attributes for cache operation to be used in Define Extend (DE).
4403 */
4404 static int
4405 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
4406 {
4407 struct dasd_eckd_private *private = device->private;
4408 struct attrib_data_t attrib;
4409
4410 if (!capable(CAP_SYS_ADMIN))
4411 return -EACCES;
4412 if (!argp)
4413 return -EINVAL;
4414
4415 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
4416 return -EFAULT;
4417 private->attrib = attrib;
4418
4419 dev_info(&device->cdev->dev,
4420 "The DASD cache mode was set to %x (%i cylinder prestage)\n",
4421 private->attrib.operation, private->attrib.nr_cyl);
4422 return 0;
4423 }
4424
4425 /*
4426 * Issue syscall I/O to EMC Symmetrix array.
4427 * CCWs are PSF and RSSD
4428 */
4429 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
4430 {
4431 struct dasd_symmio_parms usrparm;
4432 char *psf_data, *rssd_result;
4433 struct dasd_ccw_req *cqr;
4434 struct ccw1 *ccw;
4435 char psf0, psf1;
4436 int rc;
4437
4438 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
4439 return -EACCES;
4440 psf0 = psf1 = 0;
4441
4442 /* Copy parms from caller */
4443 rc = -EFAULT;
4444 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4445 goto out;
4446 if (is_compat_task()) {
4447 /* Make sure pointers are sane even on 31 bit. */
4448 rc = -EINVAL;
4449 if ((usrparm.psf_data >> 32) != 0)
4450 goto out;
4451 if ((usrparm.rssd_result >> 32) != 0)
4452 goto out;
4453 usrparm.psf_data &= 0x7fffffffULL;
4454 usrparm.rssd_result &= 0x7fffffffULL;
4455 }
4456 /* alloc I/O data area */
4457 psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
4458 rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
4459 if (!psf_data || !rssd_result) {
4460 rc = -ENOMEM;
4461 goto out_free;
4462 }
4463
4464 /* get syscall header from user space */
4465 rc = -EFAULT;
4466 if (copy_from_user(psf_data,
4467 (void __user *)(unsigned long) usrparm.psf_data,
4468 usrparm.psf_data_len))
4469 goto out_free;
4470 psf0 = psf_data[0];
4471 psf1 = psf_data[1];
4472
4473 /* setup CCWs for PSF + RSSD */
4474 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
4475 if (IS_ERR(cqr)) {
4476 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4477 "Could not allocate initialization request");
4478 rc = PTR_ERR(cqr);
4479 goto out_free;
4480 }
4481
4482 cqr->startdev = device;
4483 cqr->memdev = device;
4484 cqr->retries = 3;
4485 cqr->expires = 10 * HZ;
4486 cqr->buildclk = get_tod_clock();
4487 cqr->status = DASD_CQR_FILLED;
4488
4489 /* Build the ccws */
4490 ccw = cqr->cpaddr;
4491
4492 /* PSF ccw */
4493 ccw->cmd_code = DASD_ECKD_CCW_PSF;
4494 ccw->count = usrparm.psf_data_len;
4495 ccw->flags |= CCW_FLAG_CC;
4496 ccw->cda = (__u32)(addr_t) psf_data;
4497
4498 ccw++;
4499
4500 /* RSSD ccw */
4501 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4502 ccw->count = usrparm.rssd_result_len;
4503 ccw->flags = CCW_FLAG_SLI ;
4504 ccw->cda = (__u32)(addr_t) rssd_result;
4505
4506 rc = dasd_sleep_on(cqr);
4507 if (rc)
4508 goto out_sfree;
4509
4510 rc = -EFAULT;
4511 if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4512 rssd_result, usrparm.rssd_result_len))
4513 goto out_sfree;
4514 rc = 0;
4515
4516 out_sfree:
4517 dasd_sfree_request(cqr, cqr->memdev);
4518 out_free:
4519 kfree(rssd_result);
4520 kfree(psf_data);
4521 out:
4522 DBF_DEV_EVENT(DBF_WARNING, device,
4523 "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4524 (int) psf0, (int) psf1, rc);
4525 return rc;
4526 }
4527
4528 static int
4529 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4530 {
4531 struct dasd_device *device = block->base;
4532
4533 switch (cmd) {
4534 case BIODASDGATTR:
4535 return dasd_eckd_get_attrib(device, argp);
4536 case BIODASDSATTR:
4537 return dasd_eckd_set_attrib(device, argp);
4538 case BIODASDPSRD:
4539 return dasd_eckd_performance(device, argp);
4540 case BIODASDRLSE:
4541 return dasd_eckd_release(device);
4542 case BIODASDRSRV:
4543 return dasd_eckd_reserve(device);
4544 case BIODASDSLCK:
4545 return dasd_eckd_steal_lock(device);
4546 case BIODASDSNID:
4547 return dasd_eckd_snid(device, argp);
4548 case BIODASDSYMMIO:
4549 return dasd_symm_io(device, argp);
4550 default:
4551 return -ENOTTY;
4552 }
4553 }
4554
4555 /*
4556 * Dump the range of CCWs into 'page' buffer
4557 * and return number of printed chars.
4558 */
4559 static int
4560 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4561 {
4562 int len, count;
4563 char *datap;
4564
4565 len = 0;
4566 while (from <= to) {
4567 len += sprintf(page + len, PRINTK_HEADER
4568 " CCW %p: %08X %08X DAT:",
4569 from, ((int *) from)[0], ((int *) from)[1]);
4570
4571 /* get pointer to data (consider IDALs) */
4572 if (from->flags & CCW_FLAG_IDA)
4573 datap = (char *) *((addr_t *) (addr_t) from->cda);
4574 else
4575 datap = (char *) ((addr_t) from->cda);
4576
4577 /* dump data (max 32 bytes) */
4578 for (count = 0; count < from->count && count < 32; count++) {
4579 if (count % 8 == 0) len += sprintf(page + len, " ");
4580 if (count % 4 == 0) len += sprintf(page + len, " ");
4581 len += sprintf(page + len, "%02x", datap[count]);
4582 }
4583 len += sprintf(page + len, "\n");
4584 from++;
4585 }
4586 return len;
4587 }
4588
4589 static void
4590 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4591 char *reason)
4592 {
4593 u64 *sense;
4594 u64 *stat;
4595
4596 sense = (u64 *) dasd_get_sense(irb);
4597 stat = (u64 *) &irb->scsw;
4598 if (sense) {
4599 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4600 "%016llx %016llx %016llx %016llx",
4601 reason, *stat, *((u32 *) (stat + 1)),
4602 sense[0], sense[1], sense[2], sense[3]);
4603 } else {
4604 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4605 reason, *stat, *((u32 *) (stat + 1)),
4606 "NO VALID SENSE");
4607 }
4608 }
4609
4610 /*
4611 * Print sense data and related channel program.
4612 * Parts are printed because printk buffer is only 1024 bytes.
4613 */
4614 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4615 struct dasd_ccw_req *req, struct irb *irb)
4616 {
4617 char *page;
4618 struct ccw1 *first, *last, *fail, *from, *to;
4619 int len, sl, sct;
4620
4621 page = (char *) get_zeroed_page(GFP_ATOMIC);
4622 if (page == NULL) {
4623 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4624 "No memory to dump sense data\n");
4625 return;
4626 }
4627 /* dump the sense data */
4628 len = sprintf(page, PRINTK_HEADER
4629 " I/O status report for device %s:\n",
4630 dev_name(&device->cdev->dev));
4631 len += sprintf(page + len, PRINTK_HEADER
4632 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4633 "CS:%02X RC:%d\n",
4634 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4635 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4636 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4637 req ? req->intrc : 0);
4638 len += sprintf(page + len, PRINTK_HEADER
4639 " device %s: Failing CCW: %p\n",
4640 dev_name(&device->cdev->dev),
4641 (void *) (addr_t) irb->scsw.cmd.cpa);
4642 if (irb->esw.esw0.erw.cons) {
4643 for (sl = 0; sl < 4; sl++) {
4644 len += sprintf(page + len, PRINTK_HEADER
4645 " Sense(hex) %2d-%2d:",
4646 (8 * sl), ((8 * sl) + 7));
4647
4648 for (sct = 0; sct < 8; sct++) {
4649 len += sprintf(page + len, " %02x",
4650 irb->ecw[8 * sl + sct]);
4651 }
4652 len += sprintf(page + len, "\n");
4653 }
4654
4655 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4656 /* 24 Byte Sense Data */
4657 sprintf(page + len, PRINTK_HEADER
4658 " 24 Byte: %x MSG %x, "
4659 "%s MSGb to SYSOP\n",
4660 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4661 irb->ecw[1] & 0x10 ? "" : "no");
4662 } else {
4663 /* 32 Byte Sense Data */
4664 sprintf(page + len, PRINTK_HEADER
4665 " 32 Byte: Format: %x "
4666 "Exception class %x\n",
4667 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4668 }
4669 } else {
4670 sprintf(page + len, PRINTK_HEADER
4671 " SORRY - NO VALID SENSE AVAILABLE\n");
4672 }
4673 printk(KERN_ERR "%s", page);
4674
4675 if (req) {
4676 /* req == NULL for unsolicited interrupts */
4677 /* dump the Channel Program (max 140 Bytes per line) */
4678 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4679 first = req->cpaddr;
4680 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4681 to = min(first + 6, last);
4682 len = sprintf(page, PRINTK_HEADER
4683 " Related CP in req: %p\n", req);
4684 dasd_eckd_dump_ccw_range(first, to, page + len);
4685 printk(KERN_ERR "%s", page);
4686
4687 /* print failing CCW area (maximum 4) */
4688 /* scsw->cda is either valid or zero */
4689 len = 0;
4690 from = ++to;
4691 fail = (struct ccw1 *)(addr_t)
4692 irb->scsw.cmd.cpa; /* failing CCW */
4693 if (from < fail - 2) {
4694 from = fail - 2; /* there is a gap - print header */
4695 len += sprintf(page, PRINTK_HEADER "......\n");
4696 }
4697 to = min(fail + 1, last);
4698 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4699
4700 /* print last CCWs (maximum 2) */
4701 from = max(from, ++to);
4702 if (from < last - 1) {
4703 from = last - 1; /* there is a gap - print header */
4704 len += sprintf(page + len, PRINTK_HEADER "......\n");
4705 }
4706 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4707 if (len > 0)
4708 printk(KERN_ERR "%s", page);
4709 }
4710 free_page((unsigned long) page);
4711 }
4712
4713
4714 /*
4715 * Print sense data from a tcw.
4716 */
4717 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4718 struct dasd_ccw_req *req, struct irb *irb)
4719 {
4720 char *page;
4721 int len, sl, sct, residual;
4722 struct tsb *tsb;
4723 u8 *sense, *rcq;
4724
4725 page = (char *) get_zeroed_page(GFP_ATOMIC);
4726 if (page == NULL) {
4727 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4728 "No memory to dump sense data");
4729 return;
4730 }
4731 /* dump the sense data */
4732 len = sprintf(page, PRINTK_HEADER
4733 " I/O status report for device %s:\n",
4734 dev_name(&device->cdev->dev));
4735 len += sprintf(page + len, PRINTK_HEADER
4736 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4737 "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4738 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4739 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4740 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4741 irb->scsw.tm.fcxs,
4742 (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
4743 req ? req->intrc : 0);
4744 len += sprintf(page + len, PRINTK_HEADER
4745 " device %s: Failing TCW: %p\n",
4746 dev_name(&device->cdev->dev),
4747 (void *) (addr_t) irb->scsw.tm.tcw);
4748
4749 tsb = NULL;
4750 sense = NULL;
4751 if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4752 tsb = tcw_get_tsb(
4753 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4754
4755 if (tsb) {
4756 len += sprintf(page + len, PRINTK_HEADER
4757 " tsb->length %d\n", tsb->length);
4758 len += sprintf(page + len, PRINTK_HEADER
4759 " tsb->flags %x\n", tsb->flags);
4760 len += sprintf(page + len, PRINTK_HEADER
4761 " tsb->dcw_offset %d\n", tsb->dcw_offset);
4762 len += sprintf(page + len, PRINTK_HEADER
4763 " tsb->count %d\n", tsb->count);
4764 residual = tsb->count - 28;
4765 len += sprintf(page + len, PRINTK_HEADER
4766 " residual %d\n", residual);
4767
4768 switch (tsb->flags & 0x07) {
4769 case 1: /* tsa_iostat */
4770 len += sprintf(page + len, PRINTK_HEADER
4771 " tsb->tsa.iostat.dev_time %d\n",
4772 tsb->tsa.iostat.dev_time);
4773 len += sprintf(page + len, PRINTK_HEADER
4774 " tsb->tsa.iostat.def_time %d\n",
4775 tsb->tsa.iostat.def_time);
4776 len += sprintf(page + len, PRINTK_HEADER
4777 " tsb->tsa.iostat.queue_time %d\n",
4778 tsb->tsa.iostat.queue_time);
4779 len += sprintf(page + len, PRINTK_HEADER
4780 " tsb->tsa.iostat.dev_busy_time %d\n",
4781 tsb->tsa.iostat.dev_busy_time);
4782 len += sprintf(page + len, PRINTK_HEADER
4783 " tsb->tsa.iostat.dev_act_time %d\n",
4784 tsb->tsa.iostat.dev_act_time);
4785 sense = tsb->tsa.iostat.sense;
4786 break;
4787 case 2: /* ts_ddpc */
4788 len += sprintf(page + len, PRINTK_HEADER
4789 " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4790 for (sl = 0; sl < 2; sl++) {
4791 len += sprintf(page + len, PRINTK_HEADER
4792 " tsb->tsa.ddpc.rcq %2d-%2d: ",
4793 (8 * sl), ((8 * sl) + 7));
4794 rcq = tsb->tsa.ddpc.rcq;
4795 for (sct = 0; sct < 8; sct++) {
4796 len += sprintf(page + len, " %02x",
4797 rcq[8 * sl + sct]);
4798 }
4799 len += sprintf(page + len, "\n");
4800 }
4801 sense = tsb->tsa.ddpc.sense;
4802 break;
4803 case 3: /* tsa_intrg */
4804 len += sprintf(page + len, PRINTK_HEADER
4805 " tsb->tsa.intrg.: not supported yet\n");
4806 break;
4807 }
4808
4809 if (sense) {
4810 for (sl = 0; sl < 4; sl++) {
4811 len += sprintf(page + len, PRINTK_HEADER
4812 " Sense(hex) %2d-%2d:",
4813 (8 * sl), ((8 * sl) + 7));
4814 for (sct = 0; sct < 8; sct++) {
4815 len += sprintf(page + len, " %02x",
4816 sense[8 * sl + sct]);
4817 }
4818 len += sprintf(page + len, "\n");
4819 }
4820
4821 if (sense[27] & DASD_SENSE_BIT_0) {
4822 /* 24 Byte Sense Data */
4823 sprintf(page + len, PRINTK_HEADER
4824 " 24 Byte: %x MSG %x, "
4825 "%s MSGb to SYSOP\n",
4826 sense[7] >> 4, sense[7] & 0x0f,
4827 sense[1] & 0x10 ? "" : "no");
4828 } else {
4829 /* 32 Byte Sense Data */
4830 sprintf(page + len, PRINTK_HEADER
4831 " 32 Byte: Format: %x "
4832 "Exception class %x\n",
4833 sense[6] & 0x0f, sense[22] >> 4);
4834 }
4835 } else {
4836 sprintf(page + len, PRINTK_HEADER
4837 " SORRY - NO VALID SENSE AVAILABLE\n");
4838 }
4839 } else {
4840 sprintf(page + len, PRINTK_HEADER
4841 " SORRY - NO TSB DATA AVAILABLE\n");
4842 }
4843 printk(KERN_ERR "%s", page);
4844 free_page((unsigned long) page);
4845 }
4846
4847 static void dasd_eckd_dump_sense(struct dasd_device *device,
4848 struct dasd_ccw_req *req, struct irb *irb)
4849 {
4850 u8 *sense = dasd_get_sense(irb);
4851
4852 if (scsw_is_tm(&irb->scsw)) {
4853 /*
4854 * In some cases the 'File Protected' or 'Incorrect Length'
4855 * error might be expected and log messages shouldn't be written
4856 * then. Check if the according suppress bit is set.
4857 */
4858 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
4859 test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
4860 return;
4861 if (scsw_cstat(&irb->scsw) == 0x40 &&
4862 test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
4863 return;
4864
4865 dasd_eckd_dump_sense_tcw(device, req, irb);
4866 } else {
4867 /*
4868 * In some cases the 'Command Reject' or 'No Record Found'
4869 * error might be expected and log messages shouldn't be
4870 * written then. Check if the according suppress bit is set.
4871 */
4872 if (sense && sense[0] & SNS0_CMD_REJECT &&
4873 test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
4874 return;
4875
4876 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
4877 test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
4878 return;
4879
4880 dasd_eckd_dump_sense_ccw(device, req, irb);
4881 }
4882 }
4883
4884 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4885 {
4886 /*
4887 * the device should be disconnected from our LCU structure
4888 * on restore we will reconnect it and reread LCU specific
4889 * information like PAV support that might have changed
4890 */
4891 dasd_alias_remove_device(device);
4892 dasd_alias_disconnect_device_from_lcu(device);
4893
4894 return 0;
4895 }
4896
4897 static int dasd_eckd_restore_device(struct dasd_device *device)
4898 {
4899 struct dasd_eckd_private *private = device->private;
4900 struct dasd_eckd_characteristics temp_rdc_data;
4901 int rc;
4902 struct dasd_uid temp_uid;
4903 unsigned long flags;
4904 unsigned long cqr_flags = 0;
4905
4906 /* Read Configuration Data */
4907 rc = dasd_eckd_read_conf(device);
4908 if (rc) {
4909 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4910 "Read configuration data failed, rc=%d", rc);
4911 goto out_err;
4912 }
4913
4914 dasd_eckd_get_uid(device, &temp_uid);
4915 /* Generate device unique id */
4916 rc = dasd_eckd_generate_uid(device);
4917 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4918 if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4919 dev_err(&device->cdev->dev, "The UID of the DASD has "
4920 "changed\n");
4921 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4922 if (rc)
4923 goto out_err;
4924
4925 /* register lcu with alias handling, enable PAV if this is a new lcu */
4926 rc = dasd_alias_make_device_known_to_lcu(device);
4927 if (rc)
4928 goto out_err;
4929
4930 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4931 dasd_eckd_validate_server(device, cqr_flags);
4932
4933 /* RE-Read Configuration Data */
4934 rc = dasd_eckd_read_conf(device);
4935 if (rc) {
4936 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4937 "Read configuration data failed, rc=%d", rc);
4938 goto out_err2;
4939 }
4940
4941 /* Read Feature Codes */
4942 dasd_eckd_read_features(device);
4943
4944 /* Read Device Characteristics */
4945 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4946 &temp_rdc_data, 64);
4947 if (rc) {
4948 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4949 "Read device characteristic failed, rc=%d", rc);
4950 goto out_err2;
4951 }
4952 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4953 memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4954 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4955
4956 /* add device to alias management */
4957 dasd_alias_add_device(device);
4958
4959 return 0;
4960
4961 out_err2:
4962 dasd_alias_disconnect_device_from_lcu(device);
4963 out_err:
4964 return -1;
4965 }
4966
4967 static int dasd_eckd_reload_device(struct dasd_device *device)
4968 {
4969 struct dasd_eckd_private *private = device->private;
4970 int rc, old_base;
4971 char print_uid[60];
4972 struct dasd_uid uid;
4973 unsigned long flags;
4974
4975 /*
4976 * remove device from alias handling to prevent new requests
4977 * from being scheduled on the wrong alias device
4978 */
4979 dasd_alias_remove_device(device);
4980
4981 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4982 old_base = private->uid.base_unit_addr;
4983 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4984
4985 /* Read Configuration Data */
4986 rc = dasd_eckd_read_conf(device);
4987 if (rc)
4988 goto out_err;
4989
4990 rc = dasd_eckd_generate_uid(device);
4991 if (rc)
4992 goto out_err;
4993 /*
4994 * update unit address configuration and
4995 * add device to alias management
4996 */
4997 dasd_alias_update_add_device(device);
4998
4999 dasd_eckd_get_uid(device, &uid);
5000
5001 if (old_base != uid.base_unit_addr) {
5002 if (strlen(uid.vduit) > 0)
5003 snprintf(print_uid, sizeof(print_uid),
5004 "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
5005 uid.ssid, uid.base_unit_addr, uid.vduit);
5006 else
5007 snprintf(print_uid, sizeof(print_uid),
5008 "%s.%s.%04x.%02x", uid.vendor, uid.serial,
5009 uid.ssid, uid.base_unit_addr);
5010
5011 dev_info(&device->cdev->dev,
5012 "An Alias device was reassigned to a new base device "
5013 "with UID: %s\n", print_uid);
5014 }
5015 return 0;
5016
5017 out_err:
5018 return -1;
5019 }
5020
5021 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5022 struct dasd_rssd_messages *messages,
5023 __u8 lpum)
5024 {
5025 struct dasd_rssd_messages *message_buf;
5026 struct dasd_psf_prssd_data *prssdp;
5027 struct dasd_ccw_req *cqr;
5028 struct ccw1 *ccw;
5029 int rc;
5030
5031 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5032 (sizeof(struct dasd_psf_prssd_data) +
5033 sizeof(struct dasd_rssd_messages)),
5034 device);
5035 if (IS_ERR(cqr)) {
5036 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5037 "Could not allocate read message buffer request");
5038 return PTR_ERR(cqr);
5039 }
5040
5041 cqr->lpm = lpum;
5042 retry:
5043 cqr->startdev = device;
5044 cqr->memdev = device;
5045 cqr->block = NULL;
5046 cqr->expires = 10 * HZ;
5047 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5048 /* dasd_sleep_on_immediatly does not do complex error
5049 * recovery so clear erp flag and set retry counter to
5050 * do basic erp */
5051 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5052 cqr->retries = 256;
5053
5054 /* Prepare for Read Subsystem Data */
5055 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5056 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5057 prssdp->order = PSF_ORDER_PRSSD;
5058 prssdp->suborder = 0x03; /* Message Buffer */
5059 /* all other bytes of prssdp must be zero */
5060
5061 ccw = cqr->cpaddr;
5062 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5063 ccw->count = sizeof(struct dasd_psf_prssd_data);
5064 ccw->flags |= CCW_FLAG_CC;
5065 ccw->flags |= CCW_FLAG_SLI;
5066 ccw->cda = (__u32)(addr_t) prssdp;
5067
5068 /* Read Subsystem Data - message buffer */
5069 message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5070 memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5071
5072 ccw++;
5073 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5074 ccw->count = sizeof(struct dasd_rssd_messages);
5075 ccw->flags |= CCW_FLAG_SLI;
5076 ccw->cda = (__u32)(addr_t) message_buf;
5077
5078 cqr->buildclk = get_tod_clock();
5079 cqr->status = DASD_CQR_FILLED;
5080 rc = dasd_sleep_on_immediatly(cqr);
5081 if (rc == 0) {
5082 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5083 message_buf = (struct dasd_rssd_messages *)
5084 (prssdp + 1);
5085 memcpy(messages, message_buf,
5086 sizeof(struct dasd_rssd_messages));
5087 } else if (cqr->lpm) {
5088 /*
5089 * on z/VM we might not be able to do I/O on the requested path
5090 * but instead we get the required information on any path
5091 * so retry with open path mask
5092 */
5093 cqr->lpm = 0;
5094 goto retry;
5095 } else
5096 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5097 "Reading messages failed with rc=%d\n"
5098 , rc);
5099 dasd_sfree_request(cqr, cqr->memdev);
5100 return rc;
5101 }
5102
5103 static int dasd_eckd_query_host_access(struct dasd_device *device,
5104 struct dasd_psf_query_host_access *data)
5105 {
5106 struct dasd_eckd_private *private = device->private;
5107 struct dasd_psf_query_host_access *host_access;
5108 struct dasd_psf_prssd_data *prssdp;
5109 struct dasd_ccw_req *cqr;
5110 struct ccw1 *ccw;
5111 int rc;
5112
5113 /* not available for HYPER PAV alias devices */
5114 if (!device->block && private->lcu->pav == HYPER_PAV)
5115 return -EOPNOTSUPP;
5116
5117 /* may not be supported by the storage server */
5118 if (!(private->features.feature[14] & 0x80))
5119 return -EOPNOTSUPP;
5120
5121 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5122 sizeof(struct dasd_psf_prssd_data) + 1,
5123 device);
5124 if (IS_ERR(cqr)) {
5125 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5126 "Could not allocate read message buffer request");
5127 return PTR_ERR(cqr);
5128 }
5129 host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5130 if (!host_access) {
5131 dasd_sfree_request(cqr, device);
5132 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5133 "Could not allocate host_access buffer");
5134 return -ENOMEM;
5135 }
5136 cqr->startdev = device;
5137 cqr->memdev = device;
5138 cqr->block = NULL;
5139 cqr->retries = 256;
5140 cqr->expires = 10 * HZ;
5141
5142 /* Prepare for Read Subsystem Data */
5143 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5144 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5145 prssdp->order = PSF_ORDER_PRSSD;
5146 prssdp->suborder = PSF_SUBORDER_QHA; /* query host access */
5147 /* LSS and Volume that will be queried */
5148 prssdp->lss = private->ned->ID;
5149 prssdp->volume = private->ned->unit_addr;
5150 /* all other bytes of prssdp must be zero */
5151
5152 ccw = cqr->cpaddr;
5153 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5154 ccw->count = sizeof(struct dasd_psf_prssd_data);
5155 ccw->flags |= CCW_FLAG_CC;
5156 ccw->flags |= CCW_FLAG_SLI;
5157 ccw->cda = (__u32)(addr_t) prssdp;
5158
5159 /* Read Subsystem Data - query host access */
5160 ccw++;
5161 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5162 ccw->count = sizeof(struct dasd_psf_query_host_access);
5163 ccw->flags |= CCW_FLAG_SLI;
5164 ccw->cda = (__u32)(addr_t) host_access;
5165
5166 cqr->buildclk = get_tod_clock();
5167 cqr->status = DASD_CQR_FILLED;
5168 /* the command might not be supported, suppress error message */
5169 __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
5170 rc = dasd_sleep_on_interruptible(cqr);
5171 if (rc == 0) {
5172 *data = *host_access;
5173 } else {
5174 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5175 "Reading host access data failed with rc=%d\n",
5176 rc);
5177 rc = -EOPNOTSUPP;
5178 }
5179
5180 dasd_sfree_request(cqr, cqr->memdev);
5181 kfree(host_access);
5182 return rc;
5183 }
5184 /*
5185 * return number of grouped devices
5186 */
5187 static int dasd_eckd_host_access_count(struct dasd_device *device)
5188 {
5189 struct dasd_psf_query_host_access *access;
5190 struct dasd_ckd_path_group_entry *entry;
5191 struct dasd_ckd_host_information *info;
5192 int count = 0;
5193 int rc, i;
5194
5195 access = kzalloc(sizeof(*access), GFP_NOIO);
5196 if (!access) {
5197 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5198 "Could not allocate access buffer");
5199 return -ENOMEM;
5200 }
5201 rc = dasd_eckd_query_host_access(device, access);
5202 if (rc) {
5203 kfree(access);
5204 return rc;
5205 }
5206
5207 info = (struct dasd_ckd_host_information *)
5208 access->host_access_information;
5209 for (i = 0; i < info->entry_count; i++) {
5210 entry = (struct dasd_ckd_path_group_entry *)
5211 (info->entry + i * info->entry_size);
5212 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
5213 count++;
5214 }
5215
5216 kfree(access);
5217 return count;
5218 }
5219
5220 /*
5221 * write host access information to a sequential file
5222 */
5223 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
5224 {
5225 struct dasd_psf_query_host_access *access;
5226 struct dasd_ckd_path_group_entry *entry;
5227 struct dasd_ckd_host_information *info;
5228 char sysplex[9] = "";
5229 int rc, i, j;
5230
5231 access = kzalloc(sizeof(*access), GFP_NOIO);
5232 if (!access) {
5233 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5234 "Could not allocate access buffer");
5235 return -ENOMEM;
5236 }
5237 rc = dasd_eckd_query_host_access(device, access);
5238 if (rc) {
5239 kfree(access);
5240 return rc;
5241 }
5242
5243 info = (struct dasd_ckd_host_information *)
5244 access->host_access_information;
5245 for (i = 0; i < info->entry_count; i++) {
5246 entry = (struct dasd_ckd_path_group_entry *)
5247 (info->entry + i * info->entry_size);
5248 /* PGID */
5249 seq_puts(m, "pgid ");
5250 for (j = 0; j < 11; j++)
5251 seq_printf(m, "%02x", entry->pgid[j]);
5252 seq_putc(m, '\n');
5253 /* FLAGS */
5254 seq_printf(m, "status_flags %02x\n", entry->status_flags);
5255 /* SYSPLEX NAME */
5256 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
5257 EBCASC(sysplex, sizeof(sysplex));
5258 seq_printf(m, "sysplex_name %8s\n", sysplex);
5259 /* SUPPORTED CYLINDER */
5260 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
5261 /* TIMESTAMP */
5262 seq_printf(m, "timestamp %lu\n", (unsigned long)
5263 entry->timestamp);
5264 }
5265 kfree(access);
5266
5267 return 0;
5268 }
5269
5270 /*
5271 * Perform Subsystem Function - CUIR response
5272 */
5273 static int
5274 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
5275 __u32 message_id, __u8 lpum)
5276 {
5277 struct dasd_psf_cuir_response *psf_cuir;
5278 int pos = pathmask_to_pos(lpum);
5279 struct dasd_ccw_req *cqr;
5280 struct ccw1 *ccw;
5281 int rc;
5282
5283 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
5284 sizeof(struct dasd_psf_cuir_response),
5285 device);
5286
5287 if (IS_ERR(cqr)) {
5288 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5289 "Could not allocate PSF-CUIR request");
5290 return PTR_ERR(cqr);
5291 }
5292
5293 psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
5294 psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
5295 psf_cuir->cc = response;
5296 psf_cuir->chpid = device->path[pos].chpid;
5297 psf_cuir->message_id = message_id;
5298 psf_cuir->cssid = device->path[pos].cssid;
5299 psf_cuir->ssid = device->path[pos].ssid;
5300 ccw = cqr->cpaddr;
5301 ccw->cmd_code = DASD_ECKD_CCW_PSF;
5302 ccw->cda = (__u32)(addr_t)psf_cuir;
5303 ccw->flags = CCW_FLAG_SLI;
5304 ccw->count = sizeof(struct dasd_psf_cuir_response);
5305
5306 cqr->startdev = device;
5307 cqr->memdev = device;
5308 cqr->block = NULL;
5309 cqr->retries = 256;
5310 cqr->expires = 10*HZ;
5311 cqr->buildclk = get_tod_clock();
5312 cqr->status = DASD_CQR_FILLED;
5313 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5314
5315 rc = dasd_sleep_on(cqr);
5316
5317 dasd_sfree_request(cqr, cqr->memdev);
5318 return rc;
5319 }
5320
5321 /*
5322 * return configuration data that is referenced by record selector
5323 * if a record selector is specified or per default return the
5324 * conf_data pointer for the path specified by lpum
5325 */
5326 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
5327 __u8 lpum,
5328 struct dasd_cuir_message *cuir)
5329 {
5330 struct dasd_conf_data *conf_data;
5331 int path, pos;
5332
5333 if (cuir->record_selector == 0)
5334 goto out;
5335 for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
5336 conf_data = device->path[pos].conf_data;
5337 if (conf_data->gneq.record_selector ==
5338 cuir->record_selector)
5339 return conf_data;
5340 }
5341 out:
5342 return device->path[pathmask_to_pos(lpum)].conf_data;
5343 }
5344
5345 /*
5346 * This function determines the scope of a reconfiguration request by
5347 * analysing the path and device selection data provided in the CUIR request.
5348 * Returns a path mask containing CUIR affected paths for the give device.
5349 *
5350 * If the CUIR request does not contain the required information return the
5351 * path mask of the path the attention message for the CUIR request was reveived
5352 * on.
5353 */
5354 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
5355 struct dasd_cuir_message *cuir)
5356 {
5357 struct dasd_conf_data *ref_conf_data;
5358 unsigned long bitmask = 0, mask = 0;
5359 struct dasd_conf_data *conf_data;
5360 unsigned int pos, path;
5361 char *ref_gneq, *gneq;
5362 char *ref_ned, *ned;
5363 int tbcpm = 0;
5364
5365 /* if CUIR request does not specify the scope use the path
5366 the attention message was presented on */
5367 if (!cuir->ned_map ||
5368 !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
5369 return lpum;
5370
5371 /* get reference conf data */
5372 ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
5373 /* reference ned is determined by ned_map field */
5374 pos = 8 - ffs(cuir->ned_map);
5375 ref_ned = (char *)&ref_conf_data->neds[pos];
5376 ref_gneq = (char *)&ref_conf_data->gneq;
5377 /* transfer 24 bit neq_map to mask */
5378 mask = cuir->neq_map[2];
5379 mask |= cuir->neq_map[1] << 8;
5380 mask |= cuir->neq_map[0] << 16;
5381
5382 for (path = 0; path < 8; path++) {
5383 /* initialise data per path */
5384 bitmask = mask;
5385 conf_data = device->path[path].conf_data;
5386 pos = 8 - ffs(cuir->ned_map);
5387 ned = (char *) &conf_data->neds[pos];
5388 /* compare reference ned and per path ned */
5389 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
5390 continue;
5391 gneq = (char *)&conf_data->gneq;
5392 /* compare reference gneq and per_path gneq under
5393 24 bit mask where mask bit 0 equals byte 7 of
5394 the gneq and mask bit 24 equals byte 31 */
5395 while (bitmask) {
5396 pos = ffs(bitmask) - 1;
5397 if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
5398 != 0)
5399 break;
5400 clear_bit(pos, &bitmask);
5401 }
5402 if (bitmask)
5403 continue;
5404 /* device and path match the reference values
5405 add path to CUIR scope */
5406 tbcpm |= 0x80 >> path;
5407 }
5408 return tbcpm;
5409 }
5410
5411 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
5412 unsigned long paths, int action)
5413 {
5414 int pos;
5415
5416 while (paths) {
5417 /* get position of bit in mask */
5418 pos = 8 - ffs(paths);
5419 /* get channel path descriptor from this position */
5420 if (action == CUIR_QUIESCE)
5421 pr_warn("Service on the storage server caused path %x.%02x to go offline",
5422 device->path[pos].cssid,
5423 device->path[pos].chpid);
5424 else if (action == CUIR_RESUME)
5425 pr_info("Path %x.%02x is back online after service on the storage server",
5426 device->path[pos].cssid,
5427 device->path[pos].chpid);
5428 clear_bit(7 - pos, &paths);
5429 }
5430 }
5431
5432 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
5433 struct dasd_cuir_message *cuir)
5434 {
5435 unsigned long tbcpm;
5436
5437 tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
5438 /* nothing to do if path is not in use */
5439 if (!(dasd_path_get_opm(device) & tbcpm))
5440 return 0;
5441 if (!(dasd_path_get_opm(device) & ~tbcpm)) {
5442 /* no path would be left if the CUIR action is taken
5443 return error */
5444 return -EINVAL;
5445 }
5446 /* remove device from operational path mask */
5447 dasd_path_remove_opm(device, tbcpm);
5448 dasd_path_add_cuirpm(device, tbcpm);
5449 return tbcpm;
5450 }
5451
5452 /*
5453 * walk through all devices and build a path mask to quiesce them
5454 * return an error if the last path to a device would be removed
5455 *
5456 * if only part of the devices are quiesced and an error
5457 * occurs no onlining necessary, the storage server will
5458 * notify the already set offline devices again
5459 */
5460 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
5461 struct dasd_cuir_message *cuir)
5462 {
5463 struct dasd_eckd_private *private = device->private;
5464 struct alias_pav_group *pavgroup, *tempgroup;
5465 struct dasd_device *dev, *n;
5466 unsigned long paths = 0;
5467 unsigned long flags;
5468 int tbcpm;
5469
5470 /* active devices */
5471 list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
5472 alias_list) {
5473 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5474 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5475 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5476 if (tbcpm < 0)
5477 goto out_err;
5478 paths |= tbcpm;
5479 }
5480 /* inactive devices */
5481 list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
5482 alias_list) {
5483 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5484 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5485 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5486 if (tbcpm < 0)
5487 goto out_err;
5488 paths |= tbcpm;
5489 }
5490 /* devices in PAV groups */
5491 list_for_each_entry_safe(pavgroup, tempgroup,
5492 &private->lcu->grouplist, group) {
5493 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
5494 alias_list) {
5495 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5496 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5497 spin_unlock_irqrestore(
5498 get_ccwdev_lock(dev->cdev), flags);
5499 if (tbcpm < 0)
5500 goto out_err;
5501 paths |= tbcpm;
5502 }
5503 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
5504 alias_list) {
5505 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5506 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5507 spin_unlock_irqrestore(
5508 get_ccwdev_lock(dev->cdev), flags);
5509 if (tbcpm < 0)
5510 goto out_err;
5511 paths |= tbcpm;
5512 }
5513 }
5514 /* notify user about all paths affected by CUIR action */
5515 dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
5516 return 0;
5517 out_err:
5518 return tbcpm;
5519 }
5520
5521 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
5522 struct dasd_cuir_message *cuir)
5523 {
5524 struct dasd_eckd_private *private = device->private;
5525 struct alias_pav_group *pavgroup, *tempgroup;
5526 struct dasd_device *dev, *n;
5527 unsigned long paths = 0;
5528 int tbcpm;
5529
5530 /*
5531 * the path may have been added through a generic path event before
5532 * only trigger path verification if the path is not already in use
5533 */
5534 list_for_each_entry_safe(dev, n,
5535 &private->lcu->active_devices,
5536 alias_list) {
5537 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5538 paths |= tbcpm;
5539 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5540 dasd_path_add_tbvpm(dev, tbcpm);
5541 dasd_schedule_device_bh(dev);
5542 }
5543 }
5544 list_for_each_entry_safe(dev, n,
5545 &private->lcu->inactive_devices,
5546 alias_list) {
5547 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5548 paths |= tbcpm;
5549 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5550 dasd_path_add_tbvpm(dev, tbcpm);
5551 dasd_schedule_device_bh(dev);
5552 }
5553 }
5554 /* devices in PAV groups */
5555 list_for_each_entry_safe(pavgroup, tempgroup,
5556 &private->lcu->grouplist,
5557 group) {
5558 list_for_each_entry_safe(dev, n,
5559 &pavgroup->baselist,
5560 alias_list) {
5561 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5562 paths |= tbcpm;
5563 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5564 dasd_path_add_tbvpm(dev, tbcpm);
5565 dasd_schedule_device_bh(dev);
5566 }
5567 }
5568 list_for_each_entry_safe(dev, n,
5569 &pavgroup->aliaslist,
5570 alias_list) {
5571 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5572 paths |= tbcpm;
5573 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5574 dasd_path_add_tbvpm(dev, tbcpm);
5575 dasd_schedule_device_bh(dev);
5576 }
5577 }
5578 }
5579 /* notify user about all paths affected by CUIR action */
5580 dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
5581 return 0;
5582 }
5583
5584 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
5585 __u8 lpum)
5586 {
5587 struct dasd_cuir_message *cuir = messages;
5588 int response;
5589
5590 DBF_DEV_EVENT(DBF_WARNING, device,
5591 "CUIR request: %016llx %016llx %016llx %08x",
5592 ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
5593 ((u32 *)cuir)[3]);
5594
5595 if (cuir->code == CUIR_QUIESCE) {
5596 /* quiesce */
5597 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
5598 response = PSF_CUIR_LAST_PATH;
5599 else
5600 response = PSF_CUIR_COMPLETED;
5601 } else if (cuir->code == CUIR_RESUME) {
5602 /* resume */
5603 dasd_eckd_cuir_resume(device, lpum, cuir);
5604 response = PSF_CUIR_COMPLETED;
5605 } else
5606 response = PSF_CUIR_NOT_SUPPORTED;
5607
5608 dasd_eckd_psf_cuir_response(device, response,
5609 cuir->message_id, lpum);
5610 DBF_DEV_EVENT(DBF_WARNING, device,
5611 "CUIR response: %d on message ID %08x", response,
5612 cuir->message_id);
5613 /* to make sure there is no attention left schedule work again */
5614 device->discipline->check_attention(device, lpum);
5615 }
5616
5617 static void dasd_eckd_check_attention_work(struct work_struct *work)
5618 {
5619 struct check_attention_work_data *data;
5620 struct dasd_rssd_messages *messages;
5621 struct dasd_device *device;
5622 int rc;
5623
5624 data = container_of(work, struct check_attention_work_data, worker);
5625 device = data->device;
5626 messages = kzalloc(sizeof(*messages), GFP_KERNEL);
5627 if (!messages) {
5628 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5629 "Could not allocate attention message buffer");
5630 goto out;
5631 }
5632 rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
5633 if (rc)
5634 goto out;
5635 if (messages->length == ATTENTION_LENGTH_CUIR &&
5636 messages->format == ATTENTION_FORMAT_CUIR)
5637 dasd_eckd_handle_cuir(device, messages, data->lpum);
5638 out:
5639 dasd_put_device(device);
5640 kfree(messages);
5641 kfree(data);
5642 }
5643
5644 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
5645 {
5646 struct check_attention_work_data *data;
5647
5648 data = kzalloc(sizeof(*data), GFP_ATOMIC);
5649 if (!data)
5650 return -ENOMEM;
5651 INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
5652 dasd_get_device(device);
5653 data->device = device;
5654 data->lpum = lpum;
5655 schedule_work(&data->worker);
5656 return 0;
5657 }
5658
5659 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
5660 {
5661 if (~lpum & dasd_path_get_opm(device)) {
5662 dasd_path_add_nohpfpm(device, lpum);
5663 dasd_path_remove_opm(device, lpum);
5664 dev_err(&device->cdev->dev,
5665 "Channel path %02X lost HPF functionality and is disabled\n",
5666 lpum);
5667 return 1;
5668 }
5669 return 0;
5670 }
5671
5672 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
5673 {
5674 struct dasd_eckd_private *private = device->private;
5675
5676 dev_err(&device->cdev->dev,
5677 "High Performance FICON disabled\n");
5678 private->fcx_max_data = 0;
5679 }
5680
5681 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
5682 {
5683 struct dasd_eckd_private *private = device->private;
5684
5685 return private->fcx_max_data ? 1 : 0;
5686 }
5687
5688 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
5689 struct irb *irb)
5690 {
5691 struct dasd_eckd_private *private = device->private;
5692
5693 if (!private->fcx_max_data) {
5694 /* sanity check for no HPF, the error makes no sense */
5695 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5696 "Trying to disable HPF for a non HPF device");
5697 return;
5698 }
5699 if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
5700 dasd_eckd_disable_hpf_device(device);
5701 } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
5702 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
5703 return;
5704 dasd_eckd_disable_hpf_device(device);
5705 dasd_path_set_tbvpm(device,
5706 dasd_path_get_hpfpm(device));
5707 }
5708 /*
5709 * prevent that any new I/O ist started on the device and schedule a
5710 * requeue of existing requests
5711 */
5712 dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
5713 dasd_schedule_requeue(device);
5714 }
5715
5716 static struct ccw_driver dasd_eckd_driver = {
5717 .driver = {
5718 .name = "dasd-eckd",
5719 .owner = THIS_MODULE,
5720 },
5721 .ids = dasd_eckd_ids,
5722 .probe = dasd_eckd_probe,
5723 .remove = dasd_generic_remove,
5724 .set_offline = dasd_generic_set_offline,
5725 .set_online = dasd_eckd_set_online,
5726 .notify = dasd_generic_notify,
5727 .path_event = dasd_generic_path_event,
5728 .shutdown = dasd_generic_shutdown,
5729 .freeze = dasd_generic_pm_freeze,
5730 .thaw = dasd_generic_restore_device,
5731 .restore = dasd_generic_restore_device,
5732 .uc_handler = dasd_generic_uc_handler,
5733 .int_class = IRQIO_DAS,
5734 };
5735
5736 /*
5737 * max_blocks is dependent on the amount of storage that is available
5738 * in the static io buffer for each device. Currently each device has
5739 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
5740 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
5741 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
5742 * addition we have one define extent ccw + 16 bytes of data and one
5743 * locate record ccw + 16 bytes of data. That makes:
5744 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
5745 * We want to fit two into the available memory so that we can immediately
5746 * start the next request if one finishes off. That makes 249.5 blocks
5747 * for one request. Give a little safety and the result is 240.
5748 */
5749 static struct dasd_discipline dasd_eckd_discipline = {
5750 .owner = THIS_MODULE,
5751 .name = "ECKD",
5752 .ebcname = "ECKD",
5753 .max_blocks = 190,
5754 .check_device = dasd_eckd_check_characteristics,
5755 .uncheck_device = dasd_eckd_uncheck_device,
5756 .do_analysis = dasd_eckd_do_analysis,
5757 .verify_path = dasd_eckd_verify_path,
5758 .basic_to_ready = dasd_eckd_basic_to_ready,
5759 .online_to_ready = dasd_eckd_online_to_ready,
5760 .basic_to_known = dasd_eckd_basic_to_known,
5761 .fill_geometry = dasd_eckd_fill_geometry,
5762 .start_IO = dasd_start_IO,
5763 .term_IO = dasd_term_IO,
5764 .handle_terminated_request = dasd_eckd_handle_terminated_request,
5765 .format_device = dasd_eckd_format_device,
5766 .check_device_format = dasd_eckd_check_device_format,
5767 .erp_action = dasd_eckd_erp_action,
5768 .erp_postaction = dasd_eckd_erp_postaction,
5769 .check_for_device_change = dasd_eckd_check_for_device_change,
5770 .build_cp = dasd_eckd_build_alias_cp,
5771 .free_cp = dasd_eckd_free_alias_cp,
5772 .dump_sense = dasd_eckd_dump_sense,
5773 .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
5774 .fill_info = dasd_eckd_fill_info,
5775 .ioctl = dasd_eckd_ioctl,
5776 .freeze = dasd_eckd_pm_freeze,
5777 .restore = dasd_eckd_restore_device,
5778 .reload = dasd_eckd_reload_device,
5779 .get_uid = dasd_eckd_get_uid,
5780 .kick_validate = dasd_eckd_kick_validate_server,
5781 .check_attention = dasd_eckd_check_attention,
5782 .host_access_count = dasd_eckd_host_access_count,
5783 .hosts_print = dasd_hosts_print,
5784 .handle_hpf_error = dasd_eckd_handle_hpf_error,
5785 .disable_hpf = dasd_eckd_disable_hpf_device,
5786 .hpf_enabled = dasd_eckd_hpf_enabled,
5787 .reset_path = dasd_eckd_reset_path,
5788 };
5789
5790 static int __init
5791 dasd_eckd_init(void)
5792 {
5793 int ret;
5794
5795 ASCEBC(dasd_eckd_discipline.ebcname, 4);
5796 dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
5797 GFP_KERNEL | GFP_DMA);
5798 if (!dasd_reserve_req)
5799 return -ENOMEM;
5800 path_verification_worker = kmalloc(sizeof(*path_verification_worker),
5801 GFP_KERNEL | GFP_DMA);
5802 if (!path_verification_worker) {
5803 kfree(dasd_reserve_req);
5804 return -ENOMEM;
5805 }
5806 rawpadpage = (void *)__get_free_page(GFP_KERNEL);
5807 if (!rawpadpage) {
5808 kfree(path_verification_worker);
5809 kfree(dasd_reserve_req);
5810 return -ENOMEM;
5811 }
5812 ret = ccw_driver_register(&dasd_eckd_driver);
5813 if (!ret)
5814 wait_for_device_probe();
5815 else {
5816 kfree(path_verification_worker);
5817 kfree(dasd_reserve_req);
5818 free_page((unsigned long)rawpadpage);
5819 }
5820 return ret;
5821 }
5822
5823 static void __exit
5824 dasd_eckd_cleanup(void)
5825 {
5826 ccw_driver_unregister(&dasd_eckd_driver);
5827 kfree(path_verification_worker);
5828 kfree(dasd_reserve_req);
5829 free_page((unsigned long)rawpadpage);
5830 }
5831
5832 module_init(dasd_eckd_init);
5833 module_exit(dasd_eckd_cleanup);
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