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