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 | ||
fc19f381 SH |
11 | #define KMSG_COMPONENT "dasd" |
12 | ||
1da177e4 LT |
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> |
0a87c5cf | 29 | #include <asm/diag.h> |
1da177e4 LT |
30 | |
31 | #include "dasd_int.h" | |
32 | #include "dasd_diag.h" | |
33 | ||
1da177e4 LT |
34 | #define PRINTK_HEADER "dasd(diag):" |
35 | ||
36 | MODULE_LICENSE("GPL"); | |
37 | ||
fd49f41a HH |
38 | /* The maximum number of blocks per request (max_blocks) is dependent on the |
39 | * amount of storage that is available in the static I/O buffer for each | |
40 | * device. Currently each device gets 2 pages. We want to fit two requests | |
41 | * into the available memory so that we can immediately start the next if one | |
42 | * finishes. */ | |
43 | #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \ | |
44 | sizeof(struct dasd_diag_req)) / \ | |
45 | sizeof(struct dasd_diag_bio)) / 2) | |
46 | #define DIAG_MAX_RETRIES 32 | |
47 | #define DIAG_TIMEOUT 50 * HZ | |
48 | ||
2b67fc46 | 49 | static struct dasd_discipline dasd_diag_discipline; |
1da177e4 LT |
50 | |
51 | struct dasd_diag_private { | |
52 | struct dasd_diag_characteristics rdc_data; | |
53 | struct dasd_diag_rw_io iob; | |
54 | struct dasd_diag_init_io iib; | |
fd49f41a | 55 | blocknum_t pt_block; |
9a92fe48 | 56 | struct ccw_dev_id dev_id; |
1da177e4 LT |
57 | }; |
58 | ||
59 | struct dasd_diag_req { | |
fd49f41a | 60 | unsigned int block_count; |
1da177e4 LT |
61 | struct dasd_diag_bio bio[0]; |
62 | }; | |
63 | ||
fd49f41a HH |
64 | static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */ |
65 | ||
66 | /* Perform DIAG250 call with block I/O parameter list iob (input and output) | |
67 | * and function code cmd. | |
68 | * In case of an exception return 3. Otherwise return result of bitwise OR of | |
69 | * resulting condition code and DIAG return code. */ | |
94c12cc7 | 70 | static inline int dia250(void *iob, int cmd) |
1da177e4 | 71 | { |
04439694 | 72 | register unsigned long reg2 asm ("2") = (unsigned long) iob; |
86b368a5 PO |
73 | typedef union { |
74 | struct dasd_diag_init_io init_io; | |
75 | struct dasd_diag_rw_io rw_io; | |
fd49f41a | 76 | } addr_type; |
1da177e4 LT |
77 | int rc; |
78 | ||
94c12cc7 MS |
79 | rc = 3; |
80 | asm volatile( | |
04439694 | 81 | " diag 2,%2,0x250\n" |
fd49f41a HH |
82 | "0: ipm %0\n" |
83 | " srl %0,28\n" | |
04439694 | 84 | " or %0,3\n" |
fd49f41a | 85 | "1:\n" |
94c12cc7 MS |
86 | EX_TABLE(0b,1b) |
87 | : "+d" (rc), "=m" (*(addr_type *) iob) | |
04439694 PO |
88 | : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob) |
89 | : "3", "cc"); | |
1da177e4 LT |
90 | return rc; |
91 | } | |
92 | ||
fd49f41a HH |
93 | /* Initialize block I/O to DIAG device using the specified blocksize and |
94 | * block offset. On success, return zero and set end_block to contain the | |
95 | * number of blocks on the device minus the specified offset. Return non-zero | |
96 | * otherwise. */ | |
4d284cac | 97 | static inline int |
fd49f41a HH |
98 | mdsk_init_io(struct dasd_device *device, unsigned int blocksize, |
99 | blocknum_t offset, blocknum_t *end_block) | |
1da177e4 LT |
100 | { |
101 | struct dasd_diag_private *private; | |
102 | struct dasd_diag_init_io *iib; | |
103 | int rc; | |
104 | ||
105 | private = (struct dasd_diag_private *) device->private; | |
106 | iib = &private->iib; | |
107 | memset(iib, 0, sizeof (struct dasd_diag_init_io)); | |
108 | ||
9a92fe48 | 109 | iib->dev_nr = private->dev_id.devno; |
1da177e4 LT |
110 | iib->block_size = blocksize; |
111 | iib->offset = offset; | |
fd49f41a | 112 | iib->flaga = DASD_DIAG_FLAGA_DEFAULT; |
1da177e4 LT |
113 | |
114 | rc = dia250(iib, INIT_BIO); | |
115 | ||
fd49f41a HH |
116 | if ((rc & 3) == 0 && end_block) |
117 | *end_block = iib->end_block; | |
118 | ||
119 | return rc; | |
1da177e4 LT |
120 | } |
121 | ||
fd49f41a HH |
122 | /* Remove block I/O environment for device. Return zero on success, non-zero |
123 | * otherwise. */ | |
4d284cac | 124 | static inline int |
1da177e4 LT |
125 | mdsk_term_io(struct dasd_device * device) |
126 | { | |
127 | struct dasd_diag_private *private; | |
128 | struct dasd_diag_init_io *iib; | |
129 | int rc; | |
130 | ||
131 | private = (struct dasd_diag_private *) device->private; | |
132 | iib = &private->iib; | |
133 | memset(iib, 0, sizeof (struct dasd_diag_init_io)); | |
9a92fe48 | 134 | iib->dev_nr = private->dev_id.devno; |
1da177e4 | 135 | rc = dia250(iib, TERM_BIO); |
fd49f41a HH |
136 | return rc; |
137 | } | |
138 | ||
139 | /* Error recovery for failed DIAG requests - try to reestablish the DIAG | |
140 | * environment. */ | |
141 | static void | |
142 | dasd_diag_erp(struct dasd_device *device) | |
143 | { | |
144 | int rc; | |
145 | ||
146 | mdsk_term_io(device); | |
8e09f215 | 147 | rc = mdsk_init_io(device, device->block->bp_block, 0, NULL); |
fd49f41a | 148 | if (rc) |
fc19f381 SH |
149 | dev_warn(&device->cdev->dev, "DIAG ERP failed with " |
150 | "rc=%d\n", rc); | |
1da177e4 LT |
151 | } |
152 | ||
fd49f41a HH |
153 | /* Start a given request at the device. Return zero on success, non-zero |
154 | * otherwise. */ | |
1da177e4 LT |
155 | static int |
156 | dasd_start_diag(struct dasd_ccw_req * cqr) | |
157 | { | |
158 | struct dasd_device *device; | |
159 | struct dasd_diag_private *private; | |
160 | struct dasd_diag_req *dreq; | |
161 | int rc; | |
162 | ||
8e09f215 | 163 | device = cqr->startdev; |
fd49f41a | 164 | if (cqr->retries < 0) { |
fc19f381 | 165 | DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p " |
fd49f41a | 166 | "- no retry left)", cqr); |
8e09f215 | 167 | cqr->status = DASD_CQR_ERROR; |
fd49f41a HH |
168 | return -EIO; |
169 | } | |
1da177e4 LT |
170 | private = (struct dasd_diag_private *) device->private; |
171 | dreq = (struct dasd_diag_req *) cqr->data; | |
172 | ||
9a92fe48 | 173 | private->iob.dev_nr = private->dev_id.devno; |
1da177e4 | 174 | private->iob.key = 0; |
fd49f41a | 175 | private->iob.flags = DASD_DIAG_RWFLAG_ASYNC; |
1da177e4 | 176 | private->iob.block_count = dreq->block_count; |
fd49f41a | 177 | private->iob.interrupt_params = (addr_t) cqr; |
86b368a5 | 178 | private->iob.bio_list = dreq->bio; |
fd49f41a | 179 | private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
1da177e4 LT |
180 | |
181 | cqr->startclk = get_clock(); | |
fd49f41a HH |
182 | cqr->starttime = jiffies; |
183 | cqr->retries--; | |
1da177e4 LT |
184 | |
185 | rc = dia250(&private->iob, RW_BIO); | |
fd49f41a HH |
186 | switch (rc) { |
187 | case 0: /* Synchronous I/O finished successfully */ | |
188 | cqr->stopclk = get_clock(); | |
8e09f215 | 189 | cqr->status = DASD_CQR_SUCCESS; |
fd49f41a HH |
190 | /* Indicate to calling function that only a dasd_schedule_bh() |
191 | and no timer is needed */ | |
192 | rc = -EACCES; | |
193 | break; | |
194 | case 8: /* Asynchronous I/O was started */ | |
1da177e4 LT |
195 | cqr->status = DASD_CQR_IN_IO; |
196 | rc = 0; | |
fd49f41a HH |
197 | break; |
198 | default: /* Error condition */ | |
199 | cqr->status = DASD_CQR_QUEUED; | |
fc19f381 | 200 | DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc); |
fd49f41a HH |
201 | dasd_diag_erp(device); |
202 | rc = -EIO; | |
203 | break; | |
1da177e4 LT |
204 | } |
205 | return rc; | |
206 | } | |
207 | ||
fd49f41a HH |
208 | /* Terminate given request at the device. */ |
209 | static int | |
210 | dasd_diag_term_IO(struct dasd_ccw_req * cqr) | |
211 | { | |
212 | struct dasd_device *device; | |
213 | ||
8e09f215 | 214 | device = cqr->startdev; |
fd49f41a | 215 | mdsk_term_io(device); |
8e09f215 SW |
216 | mdsk_init_io(device, device->block->bp_block, 0, NULL); |
217 | cqr->status = DASD_CQR_CLEAR_PENDING; | |
fd49f41a | 218 | cqr->stopclk = get_clock(); |
8e09f215 | 219 | dasd_schedule_device_bh(device); |
fd49f41a HH |
220 | return 0; |
221 | } | |
222 | ||
223 | /* Handle external interruption. */ | |
1da177e4 | 224 | static void |
5a489b98 | 225 | dasd_ext_handler(__u16 code) |
1da177e4 LT |
226 | { |
227 | struct dasd_ccw_req *cqr, *next; | |
228 | struct dasd_device *device; | |
229 | unsigned long long expires; | |
230 | unsigned long flags; | |
fd49f41a HH |
231 | u8 int_code, status; |
232 | addr_t ip; | |
233 | int rc; | |
1da177e4 | 234 | |
fd49f41a HH |
235 | int_code = *((u8 *) DASD_DIAG_LC_INT_CODE); |
236 | status = *((u8 *) DASD_DIAG_LC_INT_STATUS); | |
237 | switch (int_code) { | |
238 | case DASD_DIAG_CODE_31BIT: | |
239 | ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT); | |
240 | break; | |
241 | case DASD_DIAG_CODE_64BIT: | |
242 | ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT); | |
243 | break; | |
244 | default: | |
245 | return; | |
246 | } | |
1da177e4 | 247 | if (!ip) { /* no intparm: unsolicited interrupt */ |
fc19f381 SH |
248 | DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited " |
249 | "interrupt"); | |
1da177e4 LT |
250 | return; |
251 | } | |
fd49f41a | 252 | cqr = (struct dasd_ccw_req *) ip; |
8e09f215 | 253 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 254 | if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
fc19f381 | 255 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
256 | " magic number of dasd_ccw_req 0x%08X doesn't" |
257 | " match discipline 0x%08X", | |
258 | cqr->magic, *(int *) (&device->discipline->name)); | |
259 | return; | |
260 | } | |
261 | ||
262 | /* get irq lock to modify request queue */ | |
263 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
264 | ||
fd49f41a | 265 | /* Check for a pending clear operation */ |
8e09f215 SW |
266 | if (cqr->status == DASD_CQR_CLEAR_PENDING) { |
267 | cqr->status = DASD_CQR_CLEARED; | |
268 | dasd_device_clear_timer(device); | |
269 | dasd_schedule_device_bh(device); | |
fd49f41a HH |
270 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
271 | return; | |
272 | } | |
273 | ||
1da177e4 LT |
274 | cqr->stopclk = get_clock(); |
275 | ||
276 | expires = 0; | |
277 | if (status == 0) { | |
8e09f215 | 278 | cqr->status = DASD_CQR_SUCCESS; |
1da177e4 LT |
279 | /* Start first request on queue if possible -> fast_io. */ |
280 | if (!list_empty(&device->ccw_queue)) { | |
281 | next = list_entry(device->ccw_queue.next, | |
8e09f215 | 282 | struct dasd_ccw_req, devlist); |
1da177e4 | 283 | if (next->status == DASD_CQR_QUEUED) { |
fd49f41a HH |
284 | rc = dasd_start_diag(next); |
285 | if (rc == 0) | |
1da177e4 | 286 | expires = next->expires; |
1da177e4 LT |
287 | } |
288 | } | |
fd49f41a HH |
289 | } else { |
290 | cqr->status = DASD_CQR_QUEUED; | |
fc19f381 | 291 | DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for " |
fd49f41a HH |
292 | "request %p was %d (%d retries left)", cqr, status, |
293 | cqr->retries); | |
294 | dasd_diag_erp(device); | |
295 | } | |
1da177e4 LT |
296 | |
297 | if (expires != 0) | |
8e09f215 | 298 | dasd_device_set_timer(device, expires); |
1da177e4 | 299 | else |
8e09f215 SW |
300 | dasd_device_clear_timer(device); |
301 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
302 | |
303 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
304 | } | |
305 | ||
fd49f41a HH |
306 | /* Check whether device can be controlled by DIAG discipline. Return zero on |
307 | * success, non-zero otherwise. */ | |
1da177e4 LT |
308 | static int |
309 | dasd_diag_check_device(struct dasd_device *device) | |
310 | { | |
8e09f215 | 311 | struct dasd_block *block; |
1da177e4 LT |
312 | struct dasd_diag_private *private; |
313 | struct dasd_diag_characteristics *rdc_data; | |
314 | struct dasd_diag_bio bio; | |
56dc6a88 | 315 | struct vtoc_cms_label *label; |
fd49f41a HH |
316 | blocknum_t end_block; |
317 | unsigned int sb, bsize; | |
1da177e4 LT |
318 | int rc; |
319 | ||
320 | private = (struct dasd_diag_private *) device->private; | |
321 | if (private == NULL) { | |
138c014d | 322 | private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL); |
1da177e4 | 323 | if (private == NULL) { |
fc19f381 SH |
324 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
325 | "Allocating memory for private DASD data " | |
326 | "failed\n"); | |
1da177e4 LT |
327 | return -ENOMEM; |
328 | } | |
9a92fe48 | 329 | ccw_device_get_id(device->cdev, &private->dev_id); |
1da177e4 LT |
330 | device->private = (void *) private; |
331 | } | |
8e09f215 SW |
332 | block = dasd_alloc_block(); |
333 | if (IS_ERR(block)) { | |
fc19f381 | 334 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
8e09f215 | 335 | "could not allocate dasd block structure"); |
7337194f CH |
336 | device->private = NULL; |
337 | kfree(private); | |
8e09f215 SW |
338 | return PTR_ERR(block); |
339 | } | |
340 | device->block = block; | |
341 | block->base = device; | |
342 | ||
1da177e4 LT |
343 | /* Read Device Characteristics */ |
344 | rdc_data = (void *) &(private->rdc_data); | |
9a92fe48 | 345 | rdc_data->dev_nr = private->dev_id.devno; |
1da177e4 LT |
346 | rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); |
347 | ||
348 | rc = diag210((struct diag210 *) rdc_data); | |
fd49f41a | 349 | if (rc) { |
fc19f381 | 350 | DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device " |
fd49f41a | 351 | "information (rc=%d)", rc); |
8586cb60 | 352 | rc = -EOPNOTSUPP; |
7337194f | 353 | goto out; |
fd49f41a | 354 | } |
1da177e4 LT |
355 | |
356 | /* Figure out position of label block */ | |
357 | switch (private->rdc_data.vdev_class) { | |
358 | case DEV_CLASS_FBA: | |
359 | private->pt_block = 1; | |
360 | break; | |
361 | case DEV_CLASS_ECKD: | |
362 | private->pt_block = 2; | |
363 | break; | |
364 | default: | |
fc19f381 SH |
365 | dev_warn(&device->cdev->dev, "Device type %d is not supported " |
366 | "in DIAG mode\n", private->rdc_data.vdev_class); | |
8586cb60 | 367 | rc = -EOPNOTSUPP; |
7337194f | 368 | goto out; |
1da177e4 LT |
369 | } |
370 | ||
371 | DBF_DEV_EVENT(DBF_INFO, device, | |
372 | "%04X: %04X on real %04X/%02X", | |
373 | rdc_data->dev_nr, | |
374 | rdc_data->vdev_type, | |
375 | rdc_data->rdev_type, rdc_data->rdev_model); | |
376 | ||
377 | /* terminate all outstanding operations */ | |
378 | mdsk_term_io(device); | |
379 | ||
380 | /* figure out blocksize of device */ | |
56dc6a88 | 381 | label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); |
1da177e4 | 382 | if (label == NULL) { |
fc19f381 | 383 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 | 384 | "No memory to allocate initialization request"); |
7337194f CH |
385 | rc = -ENOMEM; |
386 | goto out; | |
1da177e4 | 387 | } |
fd49f41a HH |
388 | rc = 0; |
389 | end_block = 0; | |
1da177e4 LT |
390 | /* try all sizes - needed for ECKD devices */ |
391 | for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { | |
fd49f41a | 392 | mdsk_init_io(device, bsize, 0, &end_block); |
1da177e4 LT |
393 | memset(&bio, 0, sizeof (struct dasd_diag_bio)); |
394 | bio.type = MDSK_READ_REQ; | |
395 | bio.block_number = private->pt_block + 1; | |
86b368a5 | 396 | bio.buffer = label; |
1da177e4 LT |
397 | memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); |
398 | private->iob.dev_nr = rdc_data->dev_nr; | |
399 | private->iob.key = 0; | |
400 | private->iob.flags = 0; /* do synchronous io */ | |
401 | private->iob.block_count = 1; | |
402 | private->iob.interrupt_params = 0; | |
86b368a5 | 403 | private->iob.bio_list = &bio; |
fd49f41a HH |
404 | private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
405 | rc = dia250(&private->iob, RW_BIO); | |
1e0291ba | 406 | if (rc == 3) { |
fc19f381 SH |
407 | dev_warn(&device->cdev->dev, |
408 | "A 64-bit DIAG call failed\n"); | |
1e0291ba | 409 | rc = -EOPNOTSUPP; |
7337194f | 410 | goto out_label; |
1e0291ba | 411 | } |
1da177e4 | 412 | mdsk_term_io(device); |
1e0291ba PO |
413 | if (rc == 0) |
414 | break; | |
1da177e4 | 415 | } |
1e0291ba | 416 | if (bsize > PAGE_SIZE) { |
fc19f381 SH |
417 | dev_warn(&device->cdev->dev, "Accessing the DASD failed because" |
418 | " of an incorrect format (rc=%d)\n", rc); | |
fd49f41a | 419 | rc = -EIO; |
7337194f | 420 | goto out_label; |
1e0291ba PO |
421 | } |
422 | /* check for label block */ | |
423 | if (memcmp(label->label_id, DASD_DIAG_CMS1, | |
424 | sizeof(DASD_DIAG_CMS1)) == 0) { | |
425 | /* get formatted blocksize from label block */ | |
426 | bsize = (unsigned int) label->block_size; | |
8e09f215 | 427 | block->blocks = (unsigned long) label->block_count; |
1e0291ba | 428 | } else |
8e09f215 SW |
429 | block->blocks = end_block; |
430 | block->bp_block = bsize; | |
431 | block->s2b_shift = 0; /* bits to shift 512 to get a block */ | |
1e0291ba | 432 | for (sb = 512; sb < bsize; sb = sb << 1) |
8e09f215 SW |
433 | block->s2b_shift++; |
434 | rc = mdsk_init_io(device, block->bp_block, 0, NULL); | |
1e0291ba | 435 | if (rc) { |
fc19f381 SH |
436 | dev_warn(&device->cdev->dev, "DIAG initialization " |
437 | "failed with rc=%d\n", rc); | |
1e0291ba | 438 | rc = -EIO; |
fd49f41a | 439 | } else { |
fc19f381 SH |
440 | dev_info(&device->cdev->dev, |
441 | "New DASD with %ld byte/block, total size %ld KB\n", | |
442 | (unsigned long) block->bp_block, | |
443 | (unsigned long) (block->blocks << | |
444 | block->s2b_shift) >> 1); | |
1da177e4 | 445 | } |
7337194f | 446 | out_label: |
1da177e4 | 447 | free_page((long) label); |
7337194f CH |
448 | out: |
449 | if (rc) { | |
450 | device->block = NULL; | |
451 | dasd_free_block(block); | |
452 | device->private = NULL; | |
453 | kfree(private); | |
454 | } | |
1da177e4 LT |
455 | return rc; |
456 | } | |
457 | ||
fd49f41a HH |
458 | /* Fill in virtual disk geometry for device. Return zero on success, non-zero |
459 | * otherwise. */ | |
1da177e4 | 460 | static int |
8e09f215 | 461 | dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo) |
1da177e4 | 462 | { |
8e09f215 | 463 | if (dasd_check_blocksize(block->bp_block) != 0) |
1da177e4 | 464 | return -EINVAL; |
8e09f215 | 465 | geo->cylinders = (block->blocks << block->s2b_shift) >> 10; |
1da177e4 | 466 | geo->heads = 16; |
8e09f215 | 467 | geo->sectors = 128 >> block->s2b_shift; |
1da177e4 LT |
468 | return 0; |
469 | } | |
470 | ||
1da177e4 LT |
471 | static dasd_erp_fn_t |
472 | dasd_diag_erp_action(struct dasd_ccw_req * cqr) | |
473 | { | |
474 | return dasd_default_erp_action; | |
475 | } | |
476 | ||
477 | static dasd_erp_fn_t | |
478 | dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) | |
479 | { | |
480 | return dasd_default_erp_postaction; | |
481 | } | |
482 | ||
fd49f41a HH |
483 | /* Create DASD request from block device request. Return pointer to new |
484 | * request on success, ERR_PTR otherwise. */ | |
8e09f215 SW |
485 | static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, |
486 | struct dasd_block *block, | |
487 | struct request *req) | |
1da177e4 LT |
488 | { |
489 | struct dasd_ccw_req *cqr; | |
490 | struct dasd_diag_req *dreq; | |
491 | struct dasd_diag_bio *dbio; | |
5705f702 | 492 | struct req_iterator iter; |
1da177e4 LT |
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 | 498 | unsigned char rw_cmd; |
1da177e4 LT |
499 | |
500 | if (rq_data_dir(req) == READ) | |
501 | rw_cmd = MDSK_READ_REQ; | |
502 | else if (rq_data_dir(req) == WRITE) | |
503 | rw_cmd = MDSK_WRITE_REQ; | |
504 | else | |
505 | return ERR_PTR(-EINVAL); | |
8e09f215 | 506 | blksize = block->bp_block; |
1da177e4 | 507 | /* Calculate record id of first and last block. */ |
83096ebf TH |
508 | first_rec = blk_rq_pos(req) >> block->s2b_shift; |
509 | last_rec = | |
510 | (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; | |
1da177e4 LT |
511 | /* Check struct bio and count the number of blocks for the request. */ |
512 | count = 0; | |
5705f702 | 513 | rq_for_each_segment(bv, req, iter) { |
6c92e699 JA |
514 | if (bv->bv_len & (blksize - 1)) |
515 | /* Fba can only do full blocks. */ | |
516 | return ERR_PTR(-EINVAL); | |
8e09f215 | 517 | count += bv->bv_len >> (block->s2b_shift + 9); |
1da177e4 LT |
518 | } |
519 | /* Paranoia. */ | |
520 | if (count != last_rec - first_rec + 1) | |
521 | return ERR_PTR(-EINVAL); | |
522 | /* Build the request */ | |
523 | datasize = sizeof(struct dasd_diag_req) + | |
524 | count*sizeof(struct dasd_diag_bio); | |
525 | cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0, | |
8e09f215 | 526 | datasize, memdev); |
1da177e4 LT |
527 | if (IS_ERR(cqr)) |
528 | return cqr; | |
138c014d | 529 | |
1da177e4 LT |
530 | dreq = (struct dasd_diag_req *) cqr->data; |
531 | dreq->block_count = count; | |
532 | dbio = dreq->bio; | |
533 | recid = first_rec; | |
5705f702 | 534 | rq_for_each_segment(bv, req, iter) { |
6c92e699 JA |
535 | dst = page_address(bv->bv_page) + bv->bv_offset; |
536 | for (off = 0; off < bv->bv_len; off += blksize) { | |
537 | memset(dbio, 0, sizeof (struct dasd_diag_bio)); | |
538 | dbio->type = rw_cmd; | |
539 | dbio->block_number = recid + 1; | |
540 | dbio->buffer = dst; | |
541 | dbio++; | |
542 | dst += blksize; | |
543 | recid++; | |
544 | } | |
1da177e4 | 545 | } |
fd49f41a | 546 | cqr->retries = DIAG_MAX_RETRIES; |
1da177e4 | 547 | cqr->buildclk = get_clock(); |
13de227b HS |
548 | if (blk_noretry_request(req) || |
549 | block->base->features & DASD_FEATURE_FAILFAST) | |
1c01b8a5 | 550 | set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); |
8e09f215 SW |
551 | cqr->startdev = memdev; |
552 | cqr->memdev = memdev; | |
553 | cqr->block = block; | |
fd49f41a | 554 | cqr->expires = DIAG_TIMEOUT; |
1da177e4 LT |
555 | cqr->status = DASD_CQR_FILLED; |
556 | return cqr; | |
557 | } | |
558 | ||
fd49f41a HH |
559 | /* Release DASD request. Return non-zero if request was successful, zero |
560 | * otherwise. */ | |
1da177e4 LT |
561 | static int |
562 | dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) | |
563 | { | |
564 | int status; | |
565 | ||
566 | status = cqr->status == DASD_CQR_DONE; | |
8e09f215 | 567 | dasd_sfree_request(cqr, cqr->memdev); |
1da177e4 LT |
568 | return status; |
569 | } | |
570 | ||
8e09f215 SW |
571 | static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr) |
572 | { | |
573 | cqr->status = DASD_CQR_FILLED; | |
574 | }; | |
575 | ||
fd49f41a | 576 | /* Fill in IOCTL data for device. */ |
1da177e4 LT |
577 | static int |
578 | dasd_diag_fill_info(struct dasd_device * device, | |
579 | struct dasd_information2_t * info) | |
580 | { | |
581 | struct dasd_diag_private *private; | |
582 | ||
583 | private = (struct dasd_diag_private *) device->private; | |
fd49f41a | 584 | info->label_block = (unsigned int) private->pt_block; |
1da177e4 LT |
585 | info->FBA_layout = 1; |
586 | info->format = DASD_FORMAT_LDL; | |
587 | info->characteristics_size = sizeof (struct dasd_diag_characteristics); | |
588 | memcpy(info->characteristics, | |
589 | &((struct dasd_diag_private *) device->private)->rdc_data, | |
590 | sizeof (struct dasd_diag_characteristics)); | |
591 | info->confdata_size = 0; | |
592 | return 0; | |
593 | } | |
594 | ||
595 | static void | |
596 | dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, | |
597 | struct irb *stat) | |
598 | { | |
fc19f381 | 599 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 LT |
600 | "dump sense not available for DIAG data"); |
601 | } | |
602 | ||
2b67fc46 | 603 | static struct dasd_discipline dasd_diag_discipline = { |
1da177e4 LT |
604 | .owner = THIS_MODULE, |
605 | .name = "DIAG", | |
606 | .ebcname = "DIAG", | |
fd49f41a | 607 | .max_blocks = DIAG_MAX_BLOCKS, |
1da177e4 LT |
608 | .check_device = dasd_diag_check_device, |
609 | .fill_geometry = dasd_diag_fill_geometry, | |
610 | .start_IO = dasd_start_diag, | |
fd49f41a | 611 | .term_IO = dasd_diag_term_IO, |
8e09f215 | 612 | .handle_terminated_request = dasd_diag_handle_terminated_request, |
1da177e4 LT |
613 | .erp_action = dasd_diag_erp_action, |
614 | .erp_postaction = dasd_diag_erp_postaction, | |
615 | .build_cp = dasd_diag_build_cp, | |
616 | .free_cp = dasd_diag_free_cp, | |
617 | .dump_sense = dasd_diag_dump_sense, | |
618 | .fill_info = dasd_diag_fill_info, | |
619 | }; | |
620 | ||
621 | static int __init | |
622 | dasd_diag_init(void) | |
623 | { | |
624 | if (!MACHINE_IS_VM) { | |
fc19f381 SH |
625 | pr_info("Discipline %s cannot be used without z/VM\n", |
626 | dasd_diag_discipline.name); | |
fd49f41a | 627 | return -ENODEV; |
1da177e4 LT |
628 | } |
629 | ASCEBC(dasd_diag_discipline.ebcname, 4); | |
630 | ||
631 | ctl_set_bit(0, 9); | |
632 | register_external_interrupt(0x2603, dasd_ext_handler); | |
633 | dasd_diag_discipline_pointer = &dasd_diag_discipline; | |
634 | return 0; | |
635 | } | |
636 | ||
637 | static void __exit | |
638 | dasd_diag_cleanup(void) | |
639 | { | |
1da177e4 LT |
640 | unregister_external_interrupt(0x2603, dasd_ext_handler); |
641 | ctl_clear_bit(0, 9); | |
642 | dasd_diag_discipline_pointer = NULL; | |
643 | } | |
644 | ||
645 | module_init(dasd_diag_init); | |
646 | module_exit(dasd_diag_cleanup); |