Commit | Line | Data |
---|---|---|
138c014d | 1 | /* |
1da177e4 LT |
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 | * | |
1da177e4 LT |
9 | */ |
10 | ||
1da177e4 LT |
11 | #include <linux/stddef.h> |
12 | #include <linux/kernel.h> | |
13 | #include <linux/slab.h> | |
fd49f41a | 14 | #include <linux/hdreg.h> |
1da177e4 LT |
15 | #include <linux/bio.h> |
16 | #include <linux/module.h> | |
17 | #include <linux/init.h> | |
fd49f41a | 18 | #include <linux/jiffies.h> |
1da177e4 LT |
19 | |
20 | #include <asm/dasd.h> | |
21 | #include <asm/debug.h> | |
22 | #include <asm/ebcdic.h> | |
23 | #include <asm/io.h> | |
24 | #include <asm/s390_ext.h> | |
25 | #include <asm/todclk.h> | |
56dc6a88 | 26 | #include <asm/vtoc.h> |
1da177e4 LT |
27 | |
28 | #include "dasd_int.h" | |
29 | #include "dasd_diag.h" | |
30 | ||
1da177e4 LT |
31 | #define PRINTK_HEADER "dasd(diag):" |
32 | ||
33 | MODULE_LICENSE("GPL"); | |
34 | ||
fd49f41a HH |
35 | /* The maximum number of blocks per request (max_blocks) is dependent on the |
36 | * amount of storage that is available in the static I/O buffer for each | |
37 | * device. Currently each device gets 2 pages. We want to fit two requests | |
38 | * into the available memory so that we can immediately start the next if one | |
39 | * finishes. */ | |
40 | #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \ | |
41 | sizeof(struct dasd_diag_req)) / \ | |
42 | sizeof(struct dasd_diag_bio)) / 2) | |
43 | #define DIAG_MAX_RETRIES 32 | |
44 | #define DIAG_TIMEOUT 50 * HZ | |
45 | ||
2b67fc46 | 46 | static struct dasd_discipline dasd_diag_discipline; |
1da177e4 LT |
47 | |
48 | struct dasd_diag_private { | |
49 | struct dasd_diag_characteristics rdc_data; | |
50 | struct dasd_diag_rw_io iob; | |
51 | struct dasd_diag_init_io iib; | |
fd49f41a | 52 | blocknum_t pt_block; |
1da177e4 LT |
53 | }; |
54 | ||
55 | struct dasd_diag_req { | |
fd49f41a | 56 | unsigned int block_count; |
1da177e4 LT |
57 | struct dasd_diag_bio bio[0]; |
58 | }; | |
59 | ||
fd49f41a HH |
60 | static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */ |
61 | ||
62 | /* Perform DIAG250 call with block I/O parameter list iob (input and output) | |
63 | * and function code cmd. | |
64 | * In case of an exception return 3. Otherwise return result of bitwise OR of | |
65 | * resulting condition code and DIAG return code. */ | |
94c12cc7 | 66 | static inline int dia250(void *iob, int cmd) |
1da177e4 | 67 | { |
94c12cc7 | 68 | register unsigned long reg0 asm ("0") = (unsigned long) iob; |
86b368a5 PO |
69 | typedef union { |
70 | struct dasd_diag_init_io init_io; | |
71 | struct dasd_diag_rw_io rw_io; | |
fd49f41a | 72 | } addr_type; |
1da177e4 LT |
73 | int rc; |
74 | ||
94c12cc7 MS |
75 | rc = 3; |
76 | asm volatile( | |
fd49f41a HH |
77 | " diag 0,%2,0x250\n" |
78 | "0: ipm %0\n" | |
79 | " srl %0,28\n" | |
80 | " or %0,1\n" | |
81 | "1:\n" | |
94c12cc7 MS |
82 | EX_TABLE(0b,1b) |
83 | : "+d" (rc), "=m" (*(addr_type *) iob) | |
84 | : "d" (cmd), "d" (reg0), "m" (*(addr_type *) iob) | |
85 | : "1", "cc"); | |
1da177e4 LT |
86 | return rc; |
87 | } | |
88 | ||
fd49f41a HH |
89 | /* Initialize block I/O to DIAG device using the specified blocksize and |
90 | * block offset. On success, return zero and set end_block to contain the | |
91 | * number of blocks on the device minus the specified offset. Return non-zero | |
92 | * otherwise. */ | |
4d284cac | 93 | static inline int |
fd49f41a HH |
94 | mdsk_init_io(struct dasd_device *device, unsigned int blocksize, |
95 | blocknum_t offset, blocknum_t *end_block) | |
1da177e4 LT |
96 | { |
97 | struct dasd_diag_private *private; | |
98 | struct dasd_diag_init_io *iib; | |
99 | int rc; | |
100 | ||
101 | private = (struct dasd_diag_private *) device->private; | |
102 | iib = &private->iib; | |
103 | memset(iib, 0, sizeof (struct dasd_diag_init_io)); | |
104 | ||
105 | iib->dev_nr = _ccw_device_get_device_number(device->cdev); | |
106 | iib->block_size = blocksize; | |
107 | iib->offset = offset; | |
fd49f41a | 108 | iib->flaga = DASD_DIAG_FLAGA_DEFAULT; |
1da177e4 LT |
109 | |
110 | rc = dia250(iib, INIT_BIO); | |
111 | ||
fd49f41a HH |
112 | if ((rc & 3) == 0 && end_block) |
113 | *end_block = iib->end_block; | |
114 | ||
115 | return rc; | |
1da177e4 LT |
116 | } |
117 | ||
fd49f41a HH |
118 | /* Remove block I/O environment for device. Return zero on success, non-zero |
119 | * otherwise. */ | |
4d284cac | 120 | static inline int |
1da177e4 LT |
121 | mdsk_term_io(struct dasd_device * device) |
122 | { | |
123 | struct dasd_diag_private *private; | |
124 | struct dasd_diag_init_io *iib; | |
125 | int rc; | |
126 | ||
127 | private = (struct dasd_diag_private *) device->private; | |
128 | iib = &private->iib; | |
129 | memset(iib, 0, sizeof (struct dasd_diag_init_io)); | |
130 | iib->dev_nr = _ccw_device_get_device_number(device->cdev); | |
131 | rc = dia250(iib, TERM_BIO); | |
fd49f41a HH |
132 | return rc; |
133 | } | |
134 | ||
135 | /* Error recovery for failed DIAG requests - try to reestablish the DIAG | |
136 | * environment. */ | |
137 | static void | |
138 | dasd_diag_erp(struct dasd_device *device) | |
139 | { | |
140 | int rc; | |
141 | ||
142 | mdsk_term_io(device); | |
143 | rc = mdsk_init_io(device, device->bp_block, 0, NULL); | |
144 | if (rc) | |
145 | DEV_MESSAGE(KERN_WARNING, device, "DIAG ERP unsuccessful, " | |
146 | "rc=%d", rc); | |
1da177e4 LT |
147 | } |
148 | ||
fd49f41a HH |
149 | /* Start a given request at the device. Return zero on success, non-zero |
150 | * otherwise. */ | |
1da177e4 LT |
151 | static int |
152 | dasd_start_diag(struct dasd_ccw_req * cqr) | |
153 | { | |
154 | struct dasd_device *device; | |
155 | struct dasd_diag_private *private; | |
156 | struct dasd_diag_req *dreq; | |
157 | int rc; | |
158 | ||
159 | device = cqr->device; | |
fd49f41a HH |
160 | if (cqr->retries < 0) { |
161 | DEV_MESSAGE(KERN_WARNING, device, "DIAG start_IO: request %p " | |
162 | "- no retry left)", cqr); | |
163 | cqr->status = DASD_CQR_FAILED; | |
164 | return -EIO; | |
165 | } | |
1da177e4 LT |
166 | private = (struct dasd_diag_private *) device->private; |
167 | dreq = (struct dasd_diag_req *) cqr->data; | |
168 | ||
169 | private->iob.dev_nr = _ccw_device_get_device_number(device->cdev); | |
170 | private->iob.key = 0; | |
fd49f41a | 171 | private->iob.flags = DASD_DIAG_RWFLAG_ASYNC; |
1da177e4 | 172 | private->iob.block_count = dreq->block_count; |
fd49f41a | 173 | private->iob.interrupt_params = (addr_t) cqr; |
86b368a5 | 174 | private->iob.bio_list = dreq->bio; |
fd49f41a | 175 | private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
1da177e4 LT |
176 | |
177 | cqr->startclk = get_clock(); | |
fd49f41a HH |
178 | cqr->starttime = jiffies; |
179 | cqr->retries--; | |
1da177e4 LT |
180 | |
181 | rc = dia250(&private->iob, RW_BIO); | |
fd49f41a HH |
182 | switch (rc) { |
183 | case 0: /* Synchronous I/O finished successfully */ | |
184 | cqr->stopclk = get_clock(); | |
1da177e4 | 185 | cqr->status = DASD_CQR_DONE; |
fd49f41a HH |
186 | /* Indicate to calling function that only a dasd_schedule_bh() |
187 | and no timer is needed */ | |
188 | rc = -EACCES; | |
189 | break; | |
190 | case 8: /* Asynchronous I/O was started */ | |
1da177e4 LT |
191 | cqr->status = DASD_CQR_IN_IO; |
192 | rc = 0; | |
fd49f41a HH |
193 | break; |
194 | default: /* Error condition */ | |
195 | cqr->status = DASD_CQR_QUEUED; | |
196 | DEV_MESSAGE(KERN_WARNING, device, "dia250 returned rc=%d", rc); | |
197 | dasd_diag_erp(device); | |
198 | rc = -EIO; | |
199 | break; | |
1da177e4 LT |
200 | } |
201 | return rc; | |
202 | } | |
203 | ||
fd49f41a HH |
204 | /* Terminate given request at the device. */ |
205 | static int | |
206 | dasd_diag_term_IO(struct dasd_ccw_req * cqr) | |
207 | { | |
208 | struct dasd_device *device; | |
209 | ||
210 | device = cqr->device; | |
211 | mdsk_term_io(device); | |
212 | mdsk_init_io(device, device->bp_block, 0, NULL); | |
213 | cqr->status = DASD_CQR_CLEAR; | |
214 | cqr->stopclk = get_clock(); | |
215 | dasd_schedule_bh(device); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | /* Handle external interruption. */ | |
1da177e4 | 220 | static void |
5a489b98 | 221 | dasd_ext_handler(__u16 code) |
1da177e4 LT |
222 | { |
223 | struct dasd_ccw_req *cqr, *next; | |
224 | struct dasd_device *device; | |
225 | unsigned long long expires; | |
226 | unsigned long flags; | |
fd49f41a HH |
227 | u8 int_code, status; |
228 | addr_t ip; | |
229 | int rc; | |
1da177e4 | 230 | |
fd49f41a HH |
231 | int_code = *((u8 *) DASD_DIAG_LC_INT_CODE); |
232 | status = *((u8 *) DASD_DIAG_LC_INT_STATUS); | |
233 | switch (int_code) { | |
234 | case DASD_DIAG_CODE_31BIT: | |
235 | ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT); | |
236 | break; | |
237 | case DASD_DIAG_CODE_64BIT: | |
238 | ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT); | |
239 | break; | |
240 | default: | |
241 | return; | |
242 | } | |
1da177e4 LT |
243 | if (!ip) { /* no intparm: unsolicited interrupt */ |
244 | MESSAGE(KERN_DEBUG, "%s", "caught unsolicited interrupt"); | |
245 | return; | |
246 | } | |
fd49f41a | 247 | cqr = (struct dasd_ccw_req *) ip; |
1da177e4 LT |
248 | device = (struct dasd_device *) cqr->device; |
249 | if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { | |
250 | DEV_MESSAGE(KERN_WARNING, device, | |
251 | " magic number of dasd_ccw_req 0x%08X doesn't" | |
252 | " match discipline 0x%08X", | |
253 | cqr->magic, *(int *) (&device->discipline->name)); | |
254 | return; | |
255 | } | |
256 | ||
257 | /* get irq lock to modify request queue */ | |
258 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
259 | ||
fd49f41a HH |
260 | /* Check for a pending clear operation */ |
261 | if (cqr->status == DASD_CQR_CLEAR) { | |
262 | cqr->status = DASD_CQR_QUEUED; | |
263 | dasd_clear_timer(device); | |
264 | dasd_schedule_bh(device); | |
265 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
266 | return; | |
267 | } | |
268 | ||
1da177e4 LT |
269 | cqr->stopclk = get_clock(); |
270 | ||
271 | expires = 0; | |
272 | if (status == 0) { | |
273 | cqr->status = DASD_CQR_DONE; | |
274 | /* Start first request on queue if possible -> fast_io. */ | |
275 | if (!list_empty(&device->ccw_queue)) { | |
276 | next = list_entry(device->ccw_queue.next, | |
277 | struct dasd_ccw_req, list); | |
278 | if (next->status == DASD_CQR_QUEUED) { | |
fd49f41a HH |
279 | rc = dasd_start_diag(next); |
280 | if (rc == 0) | |
1da177e4 | 281 | expires = next->expires; |
fd49f41a | 282 | else if (rc != -EACCES) |
1da177e4 LT |
283 | DEV_MESSAGE(KERN_WARNING, device, "%s", |
284 | "Interrupt fastpath " | |
285 | "failed!"); | |
286 | } | |
287 | } | |
fd49f41a HH |
288 | } else { |
289 | cqr->status = DASD_CQR_QUEUED; | |
290 | DEV_MESSAGE(KERN_WARNING, device, "interrupt status for " | |
291 | "request %p was %d (%d retries left)", cqr, status, | |
292 | cqr->retries); | |
293 | dasd_diag_erp(device); | |
294 | } | |
1da177e4 LT |
295 | |
296 | if (expires != 0) | |
297 | dasd_set_timer(device, expires); | |
298 | else | |
299 | dasd_clear_timer(device); | |
300 | dasd_schedule_bh(device); | |
301 | ||
302 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
303 | } | |
304 | ||
fd49f41a HH |
305 | /* Check whether device can be controlled by DIAG discipline. Return zero on |
306 | * success, non-zero otherwise. */ | |
1da177e4 LT |
307 | static int |
308 | dasd_diag_check_device(struct dasd_device *device) | |
309 | { | |
310 | struct dasd_diag_private *private; | |
311 | struct dasd_diag_characteristics *rdc_data; | |
312 | struct dasd_diag_bio bio; | |
56dc6a88 | 313 | struct vtoc_cms_label *label; |
fd49f41a HH |
314 | blocknum_t end_block; |
315 | unsigned int sb, bsize; | |
1da177e4 LT |
316 | int rc; |
317 | ||
318 | private = (struct dasd_diag_private *) device->private; | |
319 | if (private == NULL) { | |
138c014d | 320 | private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL); |
1da177e4 LT |
321 | if (private == NULL) { |
322 | DEV_MESSAGE(KERN_WARNING, device, "%s", | |
323 | "memory allocation failed for private data"); | |
324 | return -ENOMEM; | |
325 | } | |
326 | device->private = (void *) private; | |
327 | } | |
328 | /* Read Device Characteristics */ | |
329 | rdc_data = (void *) &(private->rdc_data); | |
330 | rdc_data->dev_nr = _ccw_device_get_device_number(device->cdev); | |
331 | rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); | |
332 | ||
333 | rc = diag210((struct diag210 *) rdc_data); | |
fd49f41a HH |
334 | if (rc) { |
335 | DEV_MESSAGE(KERN_WARNING, device, "failed to retrieve device " | |
336 | "information (rc=%d)", rc); | |
1da177e4 | 337 | return -ENOTSUPP; |
fd49f41a | 338 | } |
1da177e4 LT |
339 | |
340 | /* Figure out position of label block */ | |
341 | switch (private->rdc_data.vdev_class) { | |
342 | case DEV_CLASS_FBA: | |
343 | private->pt_block = 1; | |
344 | break; | |
345 | case DEV_CLASS_ECKD: | |
346 | private->pt_block = 2; | |
347 | break; | |
348 | default: | |
fd49f41a HH |
349 | DEV_MESSAGE(KERN_WARNING, device, "unsupported device class " |
350 | "(class=%d)", private->rdc_data.vdev_class); | |
1da177e4 LT |
351 | return -ENOTSUPP; |
352 | } | |
353 | ||
354 | DBF_DEV_EVENT(DBF_INFO, device, | |
355 | "%04X: %04X on real %04X/%02X", | |
356 | rdc_data->dev_nr, | |
357 | rdc_data->vdev_type, | |
358 | rdc_data->rdev_type, rdc_data->rdev_model); | |
359 | ||
360 | /* terminate all outstanding operations */ | |
361 | mdsk_term_io(device); | |
362 | ||
363 | /* figure out blocksize of device */ | |
56dc6a88 | 364 | label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); |
1da177e4 LT |
365 | if (label == NULL) { |
366 | DEV_MESSAGE(KERN_WARNING, device, "%s", | |
367 | "No memory to allocate initialization request"); | |
368 | return -ENOMEM; | |
369 | } | |
fd49f41a HH |
370 | rc = 0; |
371 | end_block = 0; | |
1da177e4 LT |
372 | /* try all sizes - needed for ECKD devices */ |
373 | for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { | |
fd49f41a | 374 | mdsk_init_io(device, bsize, 0, &end_block); |
1da177e4 LT |
375 | memset(&bio, 0, sizeof (struct dasd_diag_bio)); |
376 | bio.type = MDSK_READ_REQ; | |
377 | bio.block_number = private->pt_block + 1; | |
86b368a5 | 378 | bio.buffer = label; |
1da177e4 LT |
379 | memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); |
380 | private->iob.dev_nr = rdc_data->dev_nr; | |
381 | private->iob.key = 0; | |
382 | private->iob.flags = 0; /* do synchronous io */ | |
383 | private->iob.block_count = 1; | |
384 | private->iob.interrupt_params = 0; | |
86b368a5 | 385 | private->iob.bio_list = &bio; |
fd49f41a HH |
386 | private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
387 | rc = dia250(&private->iob, RW_BIO); | |
1e0291ba PO |
388 | if (rc == 3) { |
389 | DEV_MESSAGE(KERN_WARNING, device, "%s", | |
390 | "DIAG call failed"); | |
391 | rc = -EOPNOTSUPP; | |
392 | goto out; | |
393 | } | |
1da177e4 | 394 | mdsk_term_io(device); |
1e0291ba PO |
395 | if (rc == 0) |
396 | break; | |
1da177e4 | 397 | } |
1e0291ba | 398 | if (bsize > PAGE_SIZE) { |
fd49f41a HH |
399 | DEV_MESSAGE(KERN_WARNING, device, "device access failed " |
400 | "(rc=%d)", rc); | |
401 | rc = -EIO; | |
1e0291ba PO |
402 | goto out; |
403 | } | |
404 | /* check for label block */ | |
405 | if (memcmp(label->label_id, DASD_DIAG_CMS1, | |
406 | sizeof(DASD_DIAG_CMS1)) == 0) { | |
407 | /* get formatted blocksize from label block */ | |
408 | bsize = (unsigned int) label->block_size; | |
409 | device->blocks = (unsigned long) label->block_count; | |
410 | } else | |
411 | device->blocks = end_block; | |
412 | device->bp_block = bsize; | |
413 | device->s2b_shift = 0; /* bits to shift 512 to get a block */ | |
414 | for (sb = 512; sb < bsize; sb = sb << 1) | |
415 | device->s2b_shift++; | |
416 | rc = mdsk_init_io(device, device->bp_block, 0, NULL); | |
417 | if (rc) { | |
418 | DEV_MESSAGE(KERN_WARNING, device, "DIAG initialization " | |
419 | "failed (rc=%d)", rc); | |
420 | rc = -EIO; | |
fd49f41a | 421 | } else { |
1da177e4 | 422 | DEV_MESSAGE(KERN_INFO, device, |
fd49f41a HH |
423 | "(%ld B/blk): %ldkB", |
424 | (unsigned long) device->bp_block, | |
425 | (unsigned long) (device->blocks << | |
426 | device->s2b_shift) >> 1); | |
1da177e4 | 427 | } |
1e0291ba | 428 | out: |
1da177e4 LT |
429 | free_page((long) label); |
430 | return rc; | |
431 | } | |
432 | ||
fd49f41a HH |
433 | /* Fill in virtual disk geometry for device. Return zero on success, non-zero |
434 | * otherwise. */ | |
1da177e4 LT |
435 | static int |
436 | dasd_diag_fill_geometry(struct dasd_device *device, struct hd_geometry *geo) | |
437 | { | |
438 | if (dasd_check_blocksize(device->bp_block) != 0) | |
439 | return -EINVAL; | |
440 | geo->cylinders = (device->blocks << device->s2b_shift) >> 10; | |
441 | geo->heads = 16; | |
442 | geo->sectors = 128 >> device->s2b_shift; | |
443 | return 0; | |
444 | } | |
445 | ||
446 | static dasd_era_t | |
447 | dasd_diag_examine_error(struct dasd_ccw_req * cqr, struct irb * stat) | |
448 | { | |
449 | return dasd_era_fatal; | |
450 | } | |
451 | ||
452 | static dasd_erp_fn_t | |
453 | dasd_diag_erp_action(struct dasd_ccw_req * cqr) | |
454 | { | |
455 | return dasd_default_erp_action; | |
456 | } | |
457 | ||
458 | static dasd_erp_fn_t | |
459 | dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) | |
460 | { | |
461 | return dasd_default_erp_postaction; | |
462 | } | |
463 | ||
fd49f41a HH |
464 | /* Create DASD request from block device request. Return pointer to new |
465 | * request on success, ERR_PTR otherwise. */ | |
1da177e4 LT |
466 | static struct dasd_ccw_req * |
467 | dasd_diag_build_cp(struct dasd_device * device, struct request *req) | |
468 | { | |
469 | struct dasd_ccw_req *cqr; | |
470 | struct dasd_diag_req *dreq; | |
471 | struct dasd_diag_bio *dbio; | |
472 | struct bio *bio; | |
473 | struct bio_vec *bv; | |
474 | char *dst; | |
fd49f41a | 475 | unsigned int count, datasize; |
1da177e4 | 476 | sector_t recid, first_rec, last_rec; |
fd49f41a | 477 | unsigned int blksize, off; |
1da177e4 LT |
478 | unsigned char rw_cmd; |
479 | int i; | |
480 | ||
481 | if (rq_data_dir(req) == READ) | |
482 | rw_cmd = MDSK_READ_REQ; | |
483 | else if (rq_data_dir(req) == WRITE) | |
484 | rw_cmd = MDSK_WRITE_REQ; | |
485 | else | |
486 | return ERR_PTR(-EINVAL); | |
487 | blksize = device->bp_block; | |
488 | /* Calculate record id of first and last block. */ | |
489 | first_rec = req->sector >> device->s2b_shift; | |
490 | last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift; | |
491 | /* Check struct bio and count the number of blocks for the request. */ | |
492 | count = 0; | |
493 | rq_for_each_bio(bio, req) { | |
494 | bio_for_each_segment(bv, bio, i) { | |
495 | if (bv->bv_len & (blksize - 1)) | |
496 | /* Fba can only do full blocks. */ | |
497 | return ERR_PTR(-EINVAL); | |
498 | count += bv->bv_len >> (device->s2b_shift + 9); | |
499 | } | |
500 | } | |
501 | /* Paranoia. */ | |
502 | if (count != last_rec - first_rec + 1) | |
503 | return ERR_PTR(-EINVAL); | |
504 | /* Build the request */ | |
505 | datasize = sizeof(struct dasd_diag_req) + | |
506 | count*sizeof(struct dasd_diag_bio); | |
507 | cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0, | |
508 | datasize, device); | |
509 | if (IS_ERR(cqr)) | |
510 | return cqr; | |
138c014d | 511 | |
1da177e4 LT |
512 | dreq = (struct dasd_diag_req *) cqr->data; |
513 | dreq->block_count = count; | |
514 | dbio = dreq->bio; | |
515 | recid = first_rec; | |
516 | rq_for_each_bio(bio, req) { | |
517 | bio_for_each_segment(bv, bio, i) { | |
518 | dst = page_address(bv->bv_page) + bv->bv_offset; | |
519 | for (off = 0; off < bv->bv_len; off += blksize) { | |
520 | memset(dbio, 0, sizeof (struct dasd_diag_bio)); | |
521 | dbio->type = rw_cmd; | |
522 | dbio->block_number = recid + 1; | |
86b368a5 | 523 | dbio->buffer = dst; |
1da177e4 LT |
524 | dbio++; |
525 | dst += blksize; | |
526 | recid++; | |
527 | } | |
528 | } | |
529 | } | |
fd49f41a | 530 | cqr->retries = DIAG_MAX_RETRIES; |
1da177e4 | 531 | cqr->buildclk = get_clock(); |
4aff5e23 | 532 | if (req->cmd_flags & REQ_FAILFAST) |
1c01b8a5 | 533 | set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); |
1da177e4 | 534 | cqr->device = device; |
fd49f41a | 535 | cqr->expires = DIAG_TIMEOUT; |
1da177e4 LT |
536 | cqr->status = DASD_CQR_FILLED; |
537 | return cqr; | |
538 | } | |
539 | ||
fd49f41a HH |
540 | /* Release DASD request. Return non-zero if request was successful, zero |
541 | * otherwise. */ | |
1da177e4 LT |
542 | static int |
543 | dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) | |
544 | { | |
545 | int status; | |
546 | ||
547 | status = cqr->status == DASD_CQR_DONE; | |
548 | dasd_sfree_request(cqr, cqr->device); | |
549 | return status; | |
550 | } | |
551 | ||
fd49f41a | 552 | /* Fill in IOCTL data for device. */ |
1da177e4 LT |
553 | static int |
554 | dasd_diag_fill_info(struct dasd_device * device, | |
555 | struct dasd_information2_t * info) | |
556 | { | |
557 | struct dasd_diag_private *private; | |
558 | ||
559 | private = (struct dasd_diag_private *) device->private; | |
fd49f41a | 560 | info->label_block = (unsigned int) private->pt_block; |
1da177e4 LT |
561 | info->FBA_layout = 1; |
562 | info->format = DASD_FORMAT_LDL; | |
563 | info->characteristics_size = sizeof (struct dasd_diag_characteristics); | |
564 | memcpy(info->characteristics, | |
565 | &((struct dasd_diag_private *) device->private)->rdc_data, | |
566 | sizeof (struct dasd_diag_characteristics)); | |
567 | info->confdata_size = 0; | |
568 | return 0; | |
569 | } | |
570 | ||
571 | static void | |
572 | dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, | |
573 | struct irb *stat) | |
574 | { | |
575 | DEV_MESSAGE(KERN_ERR, device, "%s", | |
576 | "dump sense not available for DIAG data"); | |
577 | } | |
578 | ||
2b67fc46 | 579 | static struct dasd_discipline dasd_diag_discipline = { |
1da177e4 LT |
580 | .owner = THIS_MODULE, |
581 | .name = "DIAG", | |
582 | .ebcname = "DIAG", | |
fd49f41a | 583 | .max_blocks = DIAG_MAX_BLOCKS, |
1da177e4 LT |
584 | .check_device = dasd_diag_check_device, |
585 | .fill_geometry = dasd_diag_fill_geometry, | |
586 | .start_IO = dasd_start_diag, | |
fd49f41a | 587 | .term_IO = dasd_diag_term_IO, |
1da177e4 LT |
588 | .examine_error = dasd_diag_examine_error, |
589 | .erp_action = dasd_diag_erp_action, | |
590 | .erp_postaction = dasd_diag_erp_postaction, | |
591 | .build_cp = dasd_diag_build_cp, | |
592 | .free_cp = dasd_diag_free_cp, | |
593 | .dump_sense = dasd_diag_dump_sense, | |
594 | .fill_info = dasd_diag_fill_info, | |
595 | }; | |
596 | ||
597 | static int __init | |
598 | dasd_diag_init(void) | |
599 | { | |
600 | if (!MACHINE_IS_VM) { | |
601 | MESSAGE_LOG(KERN_INFO, | |
602 | "Machine is not VM: %s " | |
603 | "discipline not initializing", | |
604 | dasd_diag_discipline.name); | |
fd49f41a | 605 | return -ENODEV; |
1da177e4 LT |
606 | } |
607 | ASCEBC(dasd_diag_discipline.ebcname, 4); | |
608 | ||
609 | ctl_set_bit(0, 9); | |
610 | register_external_interrupt(0x2603, dasd_ext_handler); | |
611 | dasd_diag_discipline_pointer = &dasd_diag_discipline; | |
612 | return 0; | |
613 | } | |
614 | ||
615 | static void __exit | |
616 | dasd_diag_cleanup(void) | |
617 | { | |
1da177e4 LT |
618 | unregister_external_interrupt(0x2603, dasd_ext_handler); |
619 | ctl_clear_bit(0, 9); | |
620 | dasd_diag_discipline_pointer = NULL; | |
621 | } | |
622 | ||
623 | module_init(dasd_diag_init); | |
624 | module_exit(dasd_diag_cleanup); |