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1da177e4 LT |
1 | /* |
2 | * File...........: linux/drivers/s390/block/dasd_diag.c | |
3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> | |
4 | * Based on.......: linux/drivers/s390/block/mdisk.c | |
5 | * ...............: by Hartmunt Penner <hpenner@de.ibm.com> | |
6 | * Bugreports.to..: <Linux390@de.ibm.com> | |
7 | * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000 | |
8 | * | |
1c01b8a5 | 9 | * $Revision: 1.53 $ |
1da177e4 LT |
10 | */ |
11 | ||
12 | #include <linux/config.h> | |
13 | #include <linux/stddef.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/slab.h> | |
fd49f41a | 16 | #include <linux/hdreg.h> |
1da177e4 LT |
17 | #include <linux/bio.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
fd49f41a | 20 | #include <linux/jiffies.h> |
1da177e4 LT |
21 | |
22 | #include <asm/dasd.h> | |
23 | #include <asm/debug.h> | |
24 | #include <asm/ebcdic.h> | |
25 | #include <asm/io.h> | |
26 | #include <asm/s390_ext.h> | |
27 | #include <asm/todclk.h> | |
56dc6a88 | 28 | #include <asm/vtoc.h> |
1da177e4 LT |
29 | |
30 | #include "dasd_int.h" | |
31 | #include "dasd_diag.h" | |
32 | ||
1da177e4 LT |
33 | #define PRINTK_HEADER "dasd(diag):" |
34 | ||
35 | MODULE_LICENSE("GPL"); | |
36 | ||
fd49f41a HH |
37 | /* The maximum number of blocks per request (max_blocks) is dependent on the |
38 | * amount of storage that is available in the static I/O buffer for each | |
39 | * device. Currently each device gets 2 pages. We want to fit two requests | |
40 | * into the available memory so that we can immediately start the next if one | |
41 | * finishes. */ | |
42 | #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \ | |
43 | sizeof(struct dasd_diag_req)) / \ | |
44 | sizeof(struct dasd_diag_bio)) / 2) | |
45 | #define DIAG_MAX_RETRIES 32 | |
46 | #define DIAG_TIMEOUT 50 * HZ | |
47 | ||
1da177e4 LT |
48 | struct dasd_discipline dasd_diag_discipline; |
49 | ||
50 | struct dasd_diag_private { | |
51 | struct dasd_diag_characteristics rdc_data; | |
52 | struct dasd_diag_rw_io iob; | |
53 | struct dasd_diag_init_io iib; | |
fd49f41a | 54 | blocknum_t pt_block; |
1da177e4 LT |
55 | }; |
56 | ||
57 | struct dasd_diag_req { | |
fd49f41a | 58 | unsigned int block_count; |
1da177e4 LT |
59 | struct dasd_diag_bio bio[0]; |
60 | }; | |
61 | ||
fd49f41a HH |
62 | static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */ |
63 | ||
64 | /* Perform DIAG250 call with block I/O parameter list iob (input and output) | |
65 | * and function code cmd. | |
66 | * In case of an exception return 3. Otherwise return result of bitwise OR of | |
67 | * resulting condition code and DIAG return code. */ | |
1da177e4 LT |
68 | static __inline__ int |
69 | dia250(void *iob, int cmd) | |
70 | { | |
86b368a5 PO |
71 | typedef union { |
72 | struct dasd_diag_init_io init_io; | |
73 | struct dasd_diag_rw_io rw_io; | |
fd49f41a | 74 | } addr_type; |
1da177e4 LT |
75 | int rc; |
76 | ||
fd49f41a | 77 | __asm__ __volatile__( |
347a8dc3 | 78 | #ifdef CONFIG_64BIT |
fd49f41a HH |
79 | " lghi %0,3\n" |
80 | " lgr 0,%3\n" | |
81 | " diag 0,%2,0x250\n" | |
82 | "0: ipm %0\n" | |
83 | " srl %0,28\n" | |
84 | " or %0,1\n" | |
85 | "1:\n" | |
86 | ".section __ex_table,\"a\"\n" | |
87 | " .align 8\n" | |
88 | " .quad 0b,1b\n" | |
89 | ".previous\n" | |
1da177e4 | 90 | #else |
fd49f41a HH |
91 | " lhi %0,3\n" |
92 | " lr 0,%3\n" | |
93 | " diag 0,%2,0x250\n" | |
94 | "0: ipm %0\n" | |
95 | " srl %0,28\n" | |
96 | " or %0,1\n" | |
97 | "1:\n" | |
98 | ".section __ex_table,\"a\"\n" | |
99 | " .align 4\n" | |
100 | " .long 0b,1b\n" | |
101 | ".previous\n" | |
1da177e4 | 102 | #endif |
fd49f41a HH |
103 | : "=&d" (rc), "=m" (*(addr_type *) iob) |
104 | : "d" (cmd), "d" (iob), "m" (*(addr_type *) iob) | |
105 | : "0", "1", "cc"); | |
1da177e4 LT |
106 | return rc; |
107 | } | |
108 | ||
fd49f41a HH |
109 | /* Initialize block I/O to DIAG device using the specified blocksize and |
110 | * block offset. On success, return zero and set end_block to contain the | |
111 | * number of blocks on the device minus the specified offset. Return non-zero | |
112 | * otherwise. */ | |
1da177e4 | 113 | static __inline__ int |
fd49f41a HH |
114 | mdsk_init_io(struct dasd_device *device, unsigned int blocksize, |
115 | blocknum_t offset, blocknum_t *end_block) | |
1da177e4 LT |
116 | { |
117 | struct dasd_diag_private *private; | |
118 | struct dasd_diag_init_io *iib; | |
119 | int rc; | |
120 | ||
121 | private = (struct dasd_diag_private *) device->private; | |
122 | iib = &private->iib; | |
123 | memset(iib, 0, sizeof (struct dasd_diag_init_io)); | |
124 | ||
125 | iib->dev_nr = _ccw_device_get_device_number(device->cdev); | |
126 | iib->block_size = blocksize; | |
127 | iib->offset = offset; | |
fd49f41a | 128 | iib->flaga = DASD_DIAG_FLAGA_DEFAULT; |
1da177e4 LT |
129 | |
130 | rc = dia250(iib, INIT_BIO); | |
131 | ||
fd49f41a HH |
132 | if ((rc & 3) == 0 && end_block) |
133 | *end_block = iib->end_block; | |
134 | ||
135 | return rc; | |
1da177e4 LT |
136 | } |
137 | ||
fd49f41a HH |
138 | /* Remove block I/O environment for device. Return zero on success, non-zero |
139 | * otherwise. */ | |
1da177e4 LT |
140 | static __inline__ int |
141 | mdsk_term_io(struct dasd_device * device) | |
142 | { | |
143 | struct dasd_diag_private *private; | |
144 | struct dasd_diag_init_io *iib; | |
145 | int rc; | |
146 | ||
147 | private = (struct dasd_diag_private *) device->private; | |
148 | iib = &private->iib; | |
149 | memset(iib, 0, sizeof (struct dasd_diag_init_io)); | |
150 | iib->dev_nr = _ccw_device_get_device_number(device->cdev); | |
151 | rc = dia250(iib, TERM_BIO); | |
fd49f41a HH |
152 | return rc; |
153 | } | |
154 | ||
155 | /* Error recovery for failed DIAG requests - try to reestablish the DIAG | |
156 | * environment. */ | |
157 | static void | |
158 | dasd_diag_erp(struct dasd_device *device) | |
159 | { | |
160 | int rc; | |
161 | ||
162 | mdsk_term_io(device); | |
163 | rc = mdsk_init_io(device, device->bp_block, 0, NULL); | |
164 | if (rc) | |
165 | DEV_MESSAGE(KERN_WARNING, device, "DIAG ERP unsuccessful, " | |
166 | "rc=%d", rc); | |
1da177e4 LT |
167 | } |
168 | ||
fd49f41a HH |
169 | /* Start a given request at the device. Return zero on success, non-zero |
170 | * otherwise. */ | |
1da177e4 LT |
171 | static int |
172 | dasd_start_diag(struct dasd_ccw_req * cqr) | |
173 | { | |
174 | struct dasd_device *device; | |
175 | struct dasd_diag_private *private; | |
176 | struct dasd_diag_req *dreq; | |
177 | int rc; | |
178 | ||
179 | device = cqr->device; | |
fd49f41a HH |
180 | if (cqr->retries < 0) { |
181 | DEV_MESSAGE(KERN_WARNING, device, "DIAG start_IO: request %p " | |
182 | "- no retry left)", cqr); | |
183 | cqr->status = DASD_CQR_FAILED; | |
184 | return -EIO; | |
185 | } | |
1da177e4 LT |
186 | private = (struct dasd_diag_private *) device->private; |
187 | dreq = (struct dasd_diag_req *) cqr->data; | |
188 | ||
189 | private->iob.dev_nr = _ccw_device_get_device_number(device->cdev); | |
190 | private->iob.key = 0; | |
fd49f41a | 191 | private->iob.flags = DASD_DIAG_RWFLAG_ASYNC; |
1da177e4 | 192 | private->iob.block_count = dreq->block_count; |
fd49f41a | 193 | private->iob.interrupt_params = (addr_t) cqr; |
86b368a5 | 194 | private->iob.bio_list = dreq->bio; |
fd49f41a | 195 | private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
1da177e4 LT |
196 | |
197 | cqr->startclk = get_clock(); | |
fd49f41a HH |
198 | cqr->starttime = jiffies; |
199 | cqr->retries--; | |
1da177e4 LT |
200 | |
201 | rc = dia250(&private->iob, RW_BIO); | |
fd49f41a HH |
202 | switch (rc) { |
203 | case 0: /* Synchronous I/O finished successfully */ | |
204 | cqr->stopclk = get_clock(); | |
1da177e4 | 205 | cqr->status = DASD_CQR_DONE; |
fd49f41a HH |
206 | /* Indicate to calling function that only a dasd_schedule_bh() |
207 | and no timer is needed */ | |
208 | rc = -EACCES; | |
209 | break; | |
210 | case 8: /* Asynchronous I/O was started */ | |
1da177e4 LT |
211 | cqr->status = DASD_CQR_IN_IO; |
212 | rc = 0; | |
fd49f41a HH |
213 | break; |
214 | default: /* Error condition */ | |
215 | cqr->status = DASD_CQR_QUEUED; | |
216 | DEV_MESSAGE(KERN_WARNING, device, "dia250 returned rc=%d", rc); | |
217 | dasd_diag_erp(device); | |
218 | rc = -EIO; | |
219 | break; | |
1da177e4 LT |
220 | } |
221 | return rc; | |
222 | } | |
223 | ||
fd49f41a HH |
224 | /* Terminate given request at the device. */ |
225 | static int | |
226 | dasd_diag_term_IO(struct dasd_ccw_req * cqr) | |
227 | { | |
228 | struct dasd_device *device; | |
229 | ||
230 | device = cqr->device; | |
231 | mdsk_term_io(device); | |
232 | mdsk_init_io(device, device->bp_block, 0, NULL); | |
233 | cqr->status = DASD_CQR_CLEAR; | |
234 | cqr->stopclk = get_clock(); | |
235 | dasd_schedule_bh(device); | |
236 | return 0; | |
237 | } | |
238 | ||
239 | /* Handle external interruption. */ | |
1da177e4 LT |
240 | static void |
241 | dasd_ext_handler(struct pt_regs *regs, __u16 code) | |
242 | { | |
243 | struct dasd_ccw_req *cqr, *next; | |
244 | struct dasd_device *device; | |
245 | unsigned long long expires; | |
246 | unsigned long flags; | |
fd49f41a HH |
247 | u8 int_code, status; |
248 | addr_t ip; | |
249 | int rc; | |
1da177e4 | 250 | |
fd49f41a HH |
251 | int_code = *((u8 *) DASD_DIAG_LC_INT_CODE); |
252 | status = *((u8 *) DASD_DIAG_LC_INT_STATUS); | |
253 | switch (int_code) { | |
254 | case DASD_DIAG_CODE_31BIT: | |
255 | ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT); | |
256 | break; | |
257 | case DASD_DIAG_CODE_64BIT: | |
258 | ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT); | |
259 | break; | |
260 | default: | |
261 | return; | |
262 | } | |
1da177e4 LT |
263 | if (!ip) { /* no intparm: unsolicited interrupt */ |
264 | MESSAGE(KERN_DEBUG, "%s", "caught unsolicited interrupt"); | |
265 | return; | |
266 | } | |
fd49f41a | 267 | cqr = (struct dasd_ccw_req *) ip; |
1da177e4 LT |
268 | device = (struct dasd_device *) cqr->device; |
269 | if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { | |
270 | DEV_MESSAGE(KERN_WARNING, device, | |
271 | " magic number of dasd_ccw_req 0x%08X doesn't" | |
272 | " match discipline 0x%08X", | |
273 | cqr->magic, *(int *) (&device->discipline->name)); | |
274 | return; | |
275 | } | |
276 | ||
277 | /* get irq lock to modify request queue */ | |
278 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
279 | ||
fd49f41a HH |
280 | /* Check for a pending clear operation */ |
281 | if (cqr->status == DASD_CQR_CLEAR) { | |
282 | cqr->status = DASD_CQR_QUEUED; | |
283 | dasd_clear_timer(device); | |
284 | dasd_schedule_bh(device); | |
285 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
286 | return; | |
287 | } | |
288 | ||
1da177e4 LT |
289 | cqr->stopclk = get_clock(); |
290 | ||
291 | expires = 0; | |
292 | if (status == 0) { | |
293 | cqr->status = DASD_CQR_DONE; | |
294 | /* Start first request on queue if possible -> fast_io. */ | |
295 | if (!list_empty(&device->ccw_queue)) { | |
296 | next = list_entry(device->ccw_queue.next, | |
297 | struct dasd_ccw_req, list); | |
298 | if (next->status == DASD_CQR_QUEUED) { | |
fd49f41a HH |
299 | rc = dasd_start_diag(next); |
300 | if (rc == 0) | |
1da177e4 | 301 | expires = next->expires; |
fd49f41a | 302 | else if (rc != -EACCES) |
1da177e4 LT |
303 | DEV_MESSAGE(KERN_WARNING, device, "%s", |
304 | "Interrupt fastpath " | |
305 | "failed!"); | |
306 | } | |
307 | } | |
fd49f41a HH |
308 | } else { |
309 | cqr->status = DASD_CQR_QUEUED; | |
310 | DEV_MESSAGE(KERN_WARNING, device, "interrupt status for " | |
311 | "request %p was %d (%d retries left)", cqr, status, | |
312 | cqr->retries); | |
313 | dasd_diag_erp(device); | |
314 | } | |
1da177e4 LT |
315 | |
316 | if (expires != 0) | |
317 | dasd_set_timer(device, expires); | |
318 | else | |
319 | dasd_clear_timer(device); | |
320 | dasd_schedule_bh(device); | |
321 | ||
322 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
323 | } | |
324 | ||
fd49f41a HH |
325 | /* Check whether device can be controlled by DIAG discipline. Return zero on |
326 | * success, non-zero otherwise. */ | |
1da177e4 LT |
327 | static int |
328 | dasd_diag_check_device(struct dasd_device *device) | |
329 | { | |
330 | struct dasd_diag_private *private; | |
331 | struct dasd_diag_characteristics *rdc_data; | |
332 | struct dasd_diag_bio bio; | |
56dc6a88 | 333 | struct vtoc_cms_label *label; |
fd49f41a HH |
334 | blocknum_t end_block; |
335 | unsigned int sb, bsize; | |
1da177e4 LT |
336 | int rc; |
337 | ||
338 | private = (struct dasd_diag_private *) device->private; | |
339 | if (private == NULL) { | |
340 | private = kmalloc(sizeof(struct dasd_diag_private),GFP_KERNEL); | |
341 | if (private == NULL) { | |
342 | DEV_MESSAGE(KERN_WARNING, device, "%s", | |
343 | "memory allocation failed for private data"); | |
344 | return -ENOMEM; | |
345 | } | |
346 | device->private = (void *) private; | |
347 | } | |
348 | /* Read Device Characteristics */ | |
349 | rdc_data = (void *) &(private->rdc_data); | |
350 | rdc_data->dev_nr = _ccw_device_get_device_number(device->cdev); | |
351 | rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); | |
352 | ||
353 | rc = diag210((struct diag210 *) rdc_data); | |
fd49f41a HH |
354 | if (rc) { |
355 | DEV_MESSAGE(KERN_WARNING, device, "failed to retrieve device " | |
356 | "information (rc=%d)", rc); | |
1da177e4 | 357 | return -ENOTSUPP; |
fd49f41a | 358 | } |
1da177e4 LT |
359 | |
360 | /* Figure out position of label block */ | |
361 | switch (private->rdc_data.vdev_class) { | |
362 | case DEV_CLASS_FBA: | |
363 | private->pt_block = 1; | |
364 | break; | |
365 | case DEV_CLASS_ECKD: | |
366 | private->pt_block = 2; | |
367 | break; | |
368 | default: | |
fd49f41a HH |
369 | DEV_MESSAGE(KERN_WARNING, device, "unsupported device class " |
370 | "(class=%d)", private->rdc_data.vdev_class); | |
1da177e4 LT |
371 | return -ENOTSUPP; |
372 | } | |
373 | ||
374 | DBF_DEV_EVENT(DBF_INFO, device, | |
375 | "%04X: %04X on real %04X/%02X", | |
376 | rdc_data->dev_nr, | |
377 | rdc_data->vdev_type, | |
378 | rdc_data->rdev_type, rdc_data->rdev_model); | |
379 | ||
380 | /* terminate all outstanding operations */ | |
381 | mdsk_term_io(device); | |
382 | ||
383 | /* figure out blocksize of device */ | |
56dc6a88 | 384 | label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
385 | if (label == NULL) { |
386 | DEV_MESSAGE(KERN_WARNING, device, "%s", | |
387 | "No memory to allocate initialization request"); | |
388 | return -ENOMEM; | |
389 | } | |
fd49f41a HH |
390 | rc = 0; |
391 | end_block = 0; | |
1da177e4 LT |
392 | /* try all sizes - needed for ECKD devices */ |
393 | for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { | |
fd49f41a | 394 | mdsk_init_io(device, bsize, 0, &end_block); |
1da177e4 LT |
395 | memset(&bio, 0, sizeof (struct dasd_diag_bio)); |
396 | bio.type = MDSK_READ_REQ; | |
397 | bio.block_number = private->pt_block + 1; | |
86b368a5 | 398 | bio.buffer = label; |
1da177e4 LT |
399 | memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); |
400 | private->iob.dev_nr = rdc_data->dev_nr; | |
401 | private->iob.key = 0; | |
402 | private->iob.flags = 0; /* do synchronous io */ | |
403 | private->iob.block_count = 1; | |
404 | private->iob.interrupt_params = 0; | |
86b368a5 | 405 | private->iob.bio_list = &bio; |
fd49f41a HH |
406 | private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
407 | rc = dia250(&private->iob, RW_BIO); | |
1e0291ba PO |
408 | if (rc == 3) { |
409 | DEV_MESSAGE(KERN_WARNING, device, "%s", | |
410 | "DIAG call failed"); | |
411 | rc = -EOPNOTSUPP; | |
412 | goto out; | |
413 | } | |
1da177e4 | 414 | mdsk_term_io(device); |
1e0291ba PO |
415 | if (rc == 0) |
416 | break; | |
1da177e4 | 417 | } |
1e0291ba | 418 | if (bsize > PAGE_SIZE) { |
fd49f41a HH |
419 | DEV_MESSAGE(KERN_WARNING, device, "device access failed " |
420 | "(rc=%d)", rc); | |
421 | rc = -EIO; | |
1e0291ba PO |
422 | goto out; |
423 | } | |
424 | /* check for label block */ | |
425 | if (memcmp(label->label_id, DASD_DIAG_CMS1, | |
426 | sizeof(DASD_DIAG_CMS1)) == 0) { | |
427 | /* get formatted blocksize from label block */ | |
428 | bsize = (unsigned int) label->block_size; | |
429 | device->blocks = (unsigned long) label->block_count; | |
430 | } else | |
431 | device->blocks = end_block; | |
432 | device->bp_block = bsize; | |
433 | device->s2b_shift = 0; /* bits to shift 512 to get a block */ | |
434 | for (sb = 512; sb < bsize; sb = sb << 1) | |
435 | device->s2b_shift++; | |
436 | rc = mdsk_init_io(device, device->bp_block, 0, NULL); | |
437 | if (rc) { | |
438 | DEV_MESSAGE(KERN_WARNING, device, "DIAG initialization " | |
439 | "failed (rc=%d)", rc); | |
440 | rc = -EIO; | |
fd49f41a | 441 | } else { |
1da177e4 | 442 | DEV_MESSAGE(KERN_INFO, device, |
fd49f41a HH |
443 | "(%ld B/blk): %ldkB", |
444 | (unsigned long) device->bp_block, | |
445 | (unsigned long) (device->blocks << | |
446 | device->s2b_shift) >> 1); | |
1da177e4 | 447 | } |
1e0291ba | 448 | out: |
1da177e4 LT |
449 | free_page((long) label); |
450 | return rc; | |
451 | } | |
452 | ||
fd49f41a HH |
453 | /* Fill in virtual disk geometry for device. Return zero on success, non-zero |
454 | * otherwise. */ | |
1da177e4 LT |
455 | static int |
456 | dasd_diag_fill_geometry(struct dasd_device *device, struct hd_geometry *geo) | |
457 | { | |
458 | if (dasd_check_blocksize(device->bp_block) != 0) | |
459 | return -EINVAL; | |
460 | geo->cylinders = (device->blocks << device->s2b_shift) >> 10; | |
461 | geo->heads = 16; | |
462 | geo->sectors = 128 >> device->s2b_shift; | |
463 | return 0; | |
464 | } | |
465 | ||
466 | static dasd_era_t | |
467 | dasd_diag_examine_error(struct dasd_ccw_req * cqr, struct irb * stat) | |
468 | { | |
469 | return dasd_era_fatal; | |
470 | } | |
471 | ||
472 | static dasd_erp_fn_t | |
473 | dasd_diag_erp_action(struct dasd_ccw_req * cqr) | |
474 | { | |
475 | return dasd_default_erp_action; | |
476 | } | |
477 | ||
478 | static dasd_erp_fn_t | |
479 | dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) | |
480 | { | |
481 | return dasd_default_erp_postaction; | |
482 | } | |
483 | ||
fd49f41a HH |
484 | /* Create DASD request from block device request. Return pointer to new |
485 | * request on success, ERR_PTR otherwise. */ | |
1da177e4 LT |
486 | static struct dasd_ccw_req * |
487 | dasd_diag_build_cp(struct dasd_device * device, struct request *req) | |
488 | { | |
489 | struct dasd_ccw_req *cqr; | |
490 | struct dasd_diag_req *dreq; | |
491 | struct dasd_diag_bio *dbio; | |
492 | struct bio *bio; | |
493 | struct bio_vec *bv; | |
494 | char *dst; | |
fd49f41a | 495 | unsigned int count, datasize; |
1da177e4 | 496 | sector_t recid, first_rec, last_rec; |
fd49f41a | 497 | unsigned int blksize, off; |
1da177e4 LT |
498 | unsigned char rw_cmd; |
499 | int i; | |
500 | ||
501 | if (rq_data_dir(req) == READ) | |
502 | rw_cmd = MDSK_READ_REQ; | |
503 | else if (rq_data_dir(req) == WRITE) | |
504 | rw_cmd = MDSK_WRITE_REQ; | |
505 | else | |
506 | return ERR_PTR(-EINVAL); | |
507 | blksize = device->bp_block; | |
508 | /* Calculate record id of first and last block. */ | |
509 | first_rec = req->sector >> device->s2b_shift; | |
510 | last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift; | |
511 | /* Check struct bio and count the number of blocks for the request. */ | |
512 | count = 0; | |
513 | rq_for_each_bio(bio, req) { | |
514 | bio_for_each_segment(bv, bio, i) { | |
515 | if (bv->bv_len & (blksize - 1)) | |
516 | /* Fba can only do full blocks. */ | |
517 | return ERR_PTR(-EINVAL); | |
518 | count += bv->bv_len >> (device->s2b_shift + 9); | |
519 | } | |
520 | } | |
521 | /* Paranoia. */ | |
522 | if (count != last_rec - first_rec + 1) | |
523 | return ERR_PTR(-EINVAL); | |
524 | /* Build the request */ | |
525 | datasize = sizeof(struct dasd_diag_req) + | |
526 | count*sizeof(struct dasd_diag_bio); | |
527 | cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0, | |
528 | datasize, device); | |
529 | if (IS_ERR(cqr)) | |
530 | return cqr; | |
531 | ||
532 | dreq = (struct dasd_diag_req *) cqr->data; | |
533 | dreq->block_count = count; | |
534 | dbio = dreq->bio; | |
535 | recid = first_rec; | |
536 | rq_for_each_bio(bio, req) { | |
537 | bio_for_each_segment(bv, bio, i) { | |
538 | dst = page_address(bv->bv_page) + bv->bv_offset; | |
539 | for (off = 0; off < bv->bv_len; off += blksize) { | |
540 | memset(dbio, 0, sizeof (struct dasd_diag_bio)); | |
541 | dbio->type = rw_cmd; | |
542 | dbio->block_number = recid + 1; | |
86b368a5 | 543 | dbio->buffer = dst; |
1da177e4 LT |
544 | dbio++; |
545 | dst += blksize; | |
546 | recid++; | |
547 | } | |
548 | } | |
549 | } | |
fd49f41a | 550 | cqr->retries = DIAG_MAX_RETRIES; |
1da177e4 | 551 | cqr->buildclk = get_clock(); |
1c01b8a5 HH |
552 | if (req->flags & REQ_FAILFAST) |
553 | set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); | |
1da177e4 | 554 | cqr->device = device; |
fd49f41a | 555 | cqr->expires = DIAG_TIMEOUT; |
1da177e4 LT |
556 | cqr->status = DASD_CQR_FILLED; |
557 | return cqr; | |
558 | } | |
559 | ||
fd49f41a HH |
560 | /* Release DASD request. Return non-zero if request was successful, zero |
561 | * otherwise. */ | |
1da177e4 LT |
562 | static int |
563 | dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) | |
564 | { | |
565 | int status; | |
566 | ||
567 | status = cqr->status == DASD_CQR_DONE; | |
568 | dasd_sfree_request(cqr, cqr->device); | |
569 | return status; | |
570 | } | |
571 | ||
fd49f41a | 572 | /* Fill in IOCTL data for device. */ |
1da177e4 LT |
573 | static int |
574 | dasd_diag_fill_info(struct dasd_device * device, | |
575 | struct dasd_information2_t * info) | |
576 | { | |
577 | struct dasd_diag_private *private; | |
578 | ||
579 | private = (struct dasd_diag_private *) device->private; | |
fd49f41a | 580 | info->label_block = (unsigned int) private->pt_block; |
1da177e4 LT |
581 | info->FBA_layout = 1; |
582 | info->format = DASD_FORMAT_LDL; | |
583 | info->characteristics_size = sizeof (struct dasd_diag_characteristics); | |
584 | memcpy(info->characteristics, | |
585 | &((struct dasd_diag_private *) device->private)->rdc_data, | |
586 | sizeof (struct dasd_diag_characteristics)); | |
587 | info->confdata_size = 0; | |
588 | return 0; | |
589 | } | |
590 | ||
591 | static void | |
592 | dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, | |
593 | struct irb *stat) | |
594 | { | |
595 | DEV_MESSAGE(KERN_ERR, device, "%s", | |
596 | "dump sense not available for DIAG data"); | |
597 | } | |
598 | ||
1da177e4 LT |
599 | struct dasd_discipline dasd_diag_discipline = { |
600 | .owner = THIS_MODULE, | |
601 | .name = "DIAG", | |
602 | .ebcname = "DIAG", | |
fd49f41a | 603 | .max_blocks = DIAG_MAX_BLOCKS, |
1da177e4 LT |
604 | .check_device = dasd_diag_check_device, |
605 | .fill_geometry = dasd_diag_fill_geometry, | |
606 | .start_IO = dasd_start_diag, | |
fd49f41a | 607 | .term_IO = dasd_diag_term_IO, |
1da177e4 LT |
608 | .examine_error = dasd_diag_examine_error, |
609 | .erp_action = dasd_diag_erp_action, | |
610 | .erp_postaction = dasd_diag_erp_postaction, | |
611 | .build_cp = dasd_diag_build_cp, | |
612 | .free_cp = dasd_diag_free_cp, | |
613 | .dump_sense = dasd_diag_dump_sense, | |
614 | .fill_info = dasd_diag_fill_info, | |
615 | }; | |
616 | ||
617 | static int __init | |
618 | dasd_diag_init(void) | |
619 | { | |
620 | if (!MACHINE_IS_VM) { | |
621 | MESSAGE_LOG(KERN_INFO, | |
622 | "Machine is not VM: %s " | |
623 | "discipline not initializing", | |
624 | dasd_diag_discipline.name); | |
fd49f41a | 625 | return -ENODEV; |
1da177e4 LT |
626 | } |
627 | ASCEBC(dasd_diag_discipline.ebcname, 4); | |
628 | ||
629 | ctl_set_bit(0, 9); | |
630 | register_external_interrupt(0x2603, dasd_ext_handler); | |
631 | dasd_diag_discipline_pointer = &dasd_diag_discipline; | |
632 | return 0; | |
633 | } | |
634 | ||
635 | static void __exit | |
636 | dasd_diag_cleanup(void) | |
637 | { | |
1da177e4 LT |
638 | unregister_external_interrupt(0x2603, dasd_ext_handler); |
639 | ctl_clear_bit(0, 9); | |
640 | dasd_diag_discipline_pointer = NULL; | |
641 | } | |
642 | ||
643 | module_init(dasd_diag_init); | |
644 | module_exit(dasd_diag_cleanup); |