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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 | 204 | } |
6cc7f168 | 205 | cqr->intrc = rc; |
1da177e4 LT |
206 | return rc; |
207 | } | |
208 | ||
fd49f41a HH |
209 | /* Terminate given request at the device. */ |
210 | static int | |
211 | dasd_diag_term_IO(struct dasd_ccw_req * cqr) | |
212 | { | |
213 | struct dasd_device *device; | |
214 | ||
8e09f215 | 215 | device = cqr->startdev; |
fd49f41a | 216 | mdsk_term_io(device); |
8e09f215 SW |
217 | mdsk_init_io(device, device->block->bp_block, 0, NULL); |
218 | cqr->status = DASD_CQR_CLEAR_PENDING; | |
fd49f41a | 219 | cqr->stopclk = get_clock(); |
8e09f215 | 220 | dasd_schedule_device_bh(device); |
fd49f41a HH |
221 | return 0; |
222 | } | |
223 | ||
224 | /* Handle external interruption. */ | |
1da177e4 | 225 | static void |
5a489b98 | 226 | dasd_ext_handler(__u16 code) |
1da177e4 LT |
227 | { |
228 | struct dasd_ccw_req *cqr, *next; | |
229 | struct dasd_device *device; | |
230 | unsigned long long expires; | |
231 | unsigned long flags; | |
fd49f41a HH |
232 | u8 int_code, status; |
233 | addr_t ip; | |
234 | int rc; | |
1da177e4 | 235 | |
fd49f41a HH |
236 | int_code = *((u8 *) DASD_DIAG_LC_INT_CODE); |
237 | status = *((u8 *) DASD_DIAG_LC_INT_STATUS); | |
238 | switch (int_code) { | |
239 | case DASD_DIAG_CODE_31BIT: | |
240 | ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT); | |
241 | break; | |
242 | case DASD_DIAG_CODE_64BIT: | |
243 | ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT); | |
244 | break; | |
245 | default: | |
246 | return; | |
247 | } | |
1da177e4 | 248 | if (!ip) { /* no intparm: unsolicited interrupt */ |
fc19f381 SH |
249 | DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited " |
250 | "interrupt"); | |
1da177e4 LT |
251 | return; |
252 | } | |
fd49f41a | 253 | cqr = (struct dasd_ccw_req *) ip; |
8e09f215 | 254 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 255 | if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
fc19f381 | 256 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
257 | " magic number of dasd_ccw_req 0x%08X doesn't" |
258 | " match discipline 0x%08X", | |
259 | cqr->magic, *(int *) (&device->discipline->name)); | |
260 | return; | |
261 | } | |
262 | ||
263 | /* get irq lock to modify request queue */ | |
264 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
265 | ||
fd49f41a | 266 | /* Check for a pending clear operation */ |
8e09f215 SW |
267 | if (cqr->status == DASD_CQR_CLEAR_PENDING) { |
268 | cqr->status = DASD_CQR_CLEARED; | |
269 | dasd_device_clear_timer(device); | |
270 | dasd_schedule_device_bh(device); | |
fd49f41a HH |
271 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
272 | return; | |
273 | } | |
274 | ||
1da177e4 LT |
275 | cqr->stopclk = get_clock(); |
276 | ||
277 | expires = 0; | |
278 | if (status == 0) { | |
8e09f215 | 279 | cqr->status = DASD_CQR_SUCCESS; |
1da177e4 LT |
280 | /* Start first request on queue if possible -> fast_io. */ |
281 | if (!list_empty(&device->ccw_queue)) { | |
282 | next = list_entry(device->ccw_queue.next, | |
8e09f215 | 283 | struct dasd_ccw_req, devlist); |
1da177e4 | 284 | if (next->status == DASD_CQR_QUEUED) { |
fd49f41a HH |
285 | rc = dasd_start_diag(next); |
286 | if (rc == 0) | |
1da177e4 | 287 | expires = next->expires; |
1da177e4 LT |
288 | } |
289 | } | |
fd49f41a HH |
290 | } else { |
291 | cqr->status = DASD_CQR_QUEUED; | |
fc19f381 | 292 | DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for " |
fd49f41a HH |
293 | "request %p was %d (%d retries left)", cqr, status, |
294 | cqr->retries); | |
295 | dasd_diag_erp(device); | |
296 | } | |
1da177e4 LT |
297 | |
298 | if (expires != 0) | |
8e09f215 | 299 | dasd_device_set_timer(device, expires); |
1da177e4 | 300 | else |
8e09f215 SW |
301 | dasd_device_clear_timer(device); |
302 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
303 | |
304 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
305 | } | |
306 | ||
fd49f41a HH |
307 | /* Check whether device can be controlled by DIAG discipline. Return zero on |
308 | * success, non-zero otherwise. */ | |
1da177e4 LT |
309 | static int |
310 | dasd_diag_check_device(struct dasd_device *device) | |
311 | { | |
8e09f215 | 312 | struct dasd_block *block; |
1da177e4 LT |
313 | struct dasd_diag_private *private; |
314 | struct dasd_diag_characteristics *rdc_data; | |
315 | struct dasd_diag_bio bio; | |
56dc6a88 | 316 | struct vtoc_cms_label *label; |
fd49f41a HH |
317 | blocknum_t end_block; |
318 | unsigned int sb, bsize; | |
1da177e4 LT |
319 | int rc; |
320 | ||
321 | private = (struct dasd_diag_private *) device->private; | |
322 | if (private == NULL) { | |
138c014d | 323 | private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL); |
1da177e4 | 324 | if (private == NULL) { |
fc19f381 SH |
325 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
326 | "Allocating memory for private DASD data " | |
327 | "failed\n"); | |
1da177e4 LT |
328 | return -ENOMEM; |
329 | } | |
9a92fe48 | 330 | ccw_device_get_id(device->cdev, &private->dev_id); |
1da177e4 LT |
331 | device->private = (void *) private; |
332 | } | |
8e09f215 SW |
333 | block = dasd_alloc_block(); |
334 | if (IS_ERR(block)) { | |
fc19f381 | 335 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
8e09f215 | 336 | "could not allocate dasd block structure"); |
7337194f CH |
337 | device->private = NULL; |
338 | kfree(private); | |
8e09f215 SW |
339 | return PTR_ERR(block); |
340 | } | |
341 | device->block = block; | |
342 | block->base = device; | |
343 | ||
1da177e4 LT |
344 | /* Read Device Characteristics */ |
345 | rdc_data = (void *) &(private->rdc_data); | |
9a92fe48 | 346 | rdc_data->dev_nr = private->dev_id.devno; |
1da177e4 LT |
347 | rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); |
348 | ||
349 | rc = diag210((struct diag210 *) rdc_data); | |
fd49f41a | 350 | if (rc) { |
fc19f381 | 351 | DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device " |
fd49f41a | 352 | "information (rc=%d)", rc); |
8586cb60 | 353 | rc = -EOPNOTSUPP; |
7337194f | 354 | goto out; |
fd49f41a | 355 | } |
1da177e4 LT |
356 | |
357 | /* Figure out position of label block */ | |
358 | switch (private->rdc_data.vdev_class) { | |
359 | case DEV_CLASS_FBA: | |
360 | private->pt_block = 1; | |
361 | break; | |
362 | case DEV_CLASS_ECKD: | |
363 | private->pt_block = 2; | |
364 | break; | |
365 | default: | |
fc19f381 SH |
366 | dev_warn(&device->cdev->dev, "Device type %d is not supported " |
367 | "in DIAG mode\n", private->rdc_data.vdev_class); | |
8586cb60 | 368 | rc = -EOPNOTSUPP; |
7337194f | 369 | goto out; |
1da177e4 LT |
370 | } |
371 | ||
372 | DBF_DEV_EVENT(DBF_INFO, device, | |
373 | "%04X: %04X on real %04X/%02X", | |
374 | rdc_data->dev_nr, | |
375 | rdc_data->vdev_type, | |
376 | rdc_data->rdev_type, rdc_data->rdev_model); | |
377 | ||
378 | /* terminate all outstanding operations */ | |
379 | mdsk_term_io(device); | |
380 | ||
381 | /* figure out blocksize of device */ | |
56dc6a88 | 382 | label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); |
1da177e4 | 383 | if (label == NULL) { |
fc19f381 | 384 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 | 385 | "No memory to allocate initialization request"); |
7337194f CH |
386 | rc = -ENOMEM; |
387 | goto out; | |
1da177e4 | 388 | } |
fd49f41a HH |
389 | rc = 0; |
390 | end_block = 0; | |
1da177e4 LT |
391 | /* try all sizes - needed for ECKD devices */ |
392 | for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { | |
fd49f41a | 393 | mdsk_init_io(device, bsize, 0, &end_block); |
1da177e4 LT |
394 | memset(&bio, 0, sizeof (struct dasd_diag_bio)); |
395 | bio.type = MDSK_READ_REQ; | |
396 | bio.block_number = private->pt_block + 1; | |
86b368a5 | 397 | bio.buffer = label; |
1da177e4 LT |
398 | memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); |
399 | private->iob.dev_nr = rdc_data->dev_nr; | |
400 | private->iob.key = 0; | |
401 | private->iob.flags = 0; /* do synchronous io */ | |
402 | private->iob.block_count = 1; | |
403 | private->iob.interrupt_params = 0; | |
86b368a5 | 404 | private->iob.bio_list = &bio; |
fd49f41a HH |
405 | private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
406 | rc = dia250(&private->iob, RW_BIO); | |
1e0291ba | 407 | if (rc == 3) { |
fc19f381 SH |
408 | dev_warn(&device->cdev->dev, |
409 | "A 64-bit DIAG call failed\n"); | |
1e0291ba | 410 | rc = -EOPNOTSUPP; |
7337194f | 411 | goto out_label; |
1e0291ba | 412 | } |
1da177e4 | 413 | mdsk_term_io(device); |
1e0291ba PO |
414 | if (rc == 0) |
415 | break; | |
1da177e4 | 416 | } |
1e0291ba | 417 | if (bsize > PAGE_SIZE) { |
fc19f381 SH |
418 | dev_warn(&device->cdev->dev, "Accessing the DASD failed because" |
419 | " of an incorrect format (rc=%d)\n", rc); | |
fd49f41a | 420 | rc = -EIO; |
7337194f | 421 | goto out_label; |
1e0291ba PO |
422 | } |
423 | /* check for label block */ | |
424 | if (memcmp(label->label_id, DASD_DIAG_CMS1, | |
425 | sizeof(DASD_DIAG_CMS1)) == 0) { | |
426 | /* get formatted blocksize from label block */ | |
427 | bsize = (unsigned int) label->block_size; | |
8e09f215 | 428 | block->blocks = (unsigned long) label->block_count; |
1e0291ba | 429 | } else |
8e09f215 SW |
430 | block->blocks = end_block; |
431 | block->bp_block = bsize; | |
432 | block->s2b_shift = 0; /* bits to shift 512 to get a block */ | |
1e0291ba | 433 | for (sb = 512; sb < bsize; sb = sb << 1) |
8e09f215 SW |
434 | block->s2b_shift++; |
435 | rc = mdsk_init_io(device, block->bp_block, 0, NULL); | |
1e0291ba | 436 | if (rc) { |
fc19f381 SH |
437 | dev_warn(&device->cdev->dev, "DIAG initialization " |
438 | "failed with rc=%d\n", rc); | |
1e0291ba | 439 | rc = -EIO; |
fd49f41a | 440 | } else { |
fc19f381 SH |
441 | dev_info(&device->cdev->dev, |
442 | "New DASD with %ld byte/block, total size %ld KB\n", | |
443 | (unsigned long) block->bp_block, | |
444 | (unsigned long) (block->blocks << | |
445 | block->s2b_shift) >> 1); | |
1da177e4 | 446 | } |
7337194f | 447 | out_label: |
1da177e4 | 448 | free_page((long) label); |
7337194f CH |
449 | out: |
450 | if (rc) { | |
451 | device->block = NULL; | |
452 | dasd_free_block(block); | |
453 | device->private = NULL; | |
454 | kfree(private); | |
455 | } | |
1da177e4 LT |
456 | return rc; |
457 | } | |
458 | ||
fd49f41a HH |
459 | /* Fill in virtual disk geometry for device. Return zero on success, non-zero |
460 | * otherwise. */ | |
1da177e4 | 461 | static int |
8e09f215 | 462 | dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo) |
1da177e4 | 463 | { |
8e09f215 | 464 | if (dasd_check_blocksize(block->bp_block) != 0) |
1da177e4 | 465 | return -EINVAL; |
8e09f215 | 466 | geo->cylinders = (block->blocks << block->s2b_shift) >> 10; |
1da177e4 | 467 | geo->heads = 16; |
8e09f215 | 468 | geo->sectors = 128 >> block->s2b_shift; |
1da177e4 LT |
469 | return 0; |
470 | } | |
471 | ||
1da177e4 LT |
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. */ | |
8e09f215 SW |
486 | static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, |
487 | struct dasd_block *block, | |
488 | struct request *req) | |
1da177e4 LT |
489 | { |
490 | struct dasd_ccw_req *cqr; | |
491 | struct dasd_diag_req *dreq; | |
492 | struct dasd_diag_bio *dbio; | |
5705f702 | 493 | struct req_iterator iter; |
1da177e4 LT |
494 | struct bio_vec *bv; |
495 | char *dst; | |
fd49f41a | 496 | unsigned int count, datasize; |
1da177e4 | 497 | sector_t recid, first_rec, last_rec; |
fd49f41a | 498 | unsigned int blksize, off; |
1da177e4 | 499 | unsigned char rw_cmd; |
1da177e4 LT |
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); | |
8e09f215 | 507 | blksize = block->bp_block; |
1da177e4 | 508 | /* Calculate record id of first and last block. */ |
83096ebf TH |
509 | first_rec = blk_rq_pos(req) >> block->s2b_shift; |
510 | last_rec = | |
511 | (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; | |
1da177e4 LT |
512 | /* Check struct bio and count the number of blocks for the request. */ |
513 | count = 0; | |
5705f702 | 514 | rq_for_each_segment(bv, req, iter) { |
6c92e699 JA |
515 | if (bv->bv_len & (blksize - 1)) |
516 | /* Fba can only do full blocks. */ | |
517 | return ERR_PTR(-EINVAL); | |
8e09f215 | 518 | count += bv->bv_len >> (block->s2b_shift + 9); |
1da177e4 LT |
519 | } |
520 | /* Paranoia. */ | |
521 | if (count != last_rec - first_rec + 1) | |
522 | return ERR_PTR(-EINVAL); | |
523 | /* Build the request */ | |
524 | datasize = sizeof(struct dasd_diag_req) + | |
525 | count*sizeof(struct dasd_diag_bio); | |
526 | cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0, | |
8e09f215 | 527 | datasize, memdev); |
1da177e4 LT |
528 | if (IS_ERR(cqr)) |
529 | return cqr; | |
138c014d | 530 | |
1da177e4 LT |
531 | dreq = (struct dasd_diag_req *) cqr->data; |
532 | dreq->block_count = count; | |
533 | dbio = dreq->bio; | |
534 | recid = first_rec; | |
5705f702 | 535 | rq_for_each_segment(bv, req, iter) { |
6c92e699 JA |
536 | dst = page_address(bv->bv_page) + bv->bv_offset; |
537 | for (off = 0; off < bv->bv_len; off += blksize) { | |
538 | memset(dbio, 0, sizeof (struct dasd_diag_bio)); | |
539 | dbio->type = rw_cmd; | |
540 | dbio->block_number = recid + 1; | |
541 | dbio->buffer = dst; | |
542 | dbio++; | |
543 | dst += blksize; | |
544 | recid++; | |
545 | } | |
1da177e4 | 546 | } |
fd49f41a | 547 | cqr->retries = DIAG_MAX_RETRIES; |
1da177e4 | 548 | cqr->buildclk = get_clock(); |
13de227b HS |
549 | if (blk_noretry_request(req) || |
550 | block->base->features & DASD_FEATURE_FAILFAST) | |
1c01b8a5 | 551 | set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); |
8e09f215 SW |
552 | cqr->startdev = memdev; |
553 | cqr->memdev = memdev; | |
554 | cqr->block = block; | |
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; | |
8e09f215 | 568 | dasd_sfree_request(cqr, cqr->memdev); |
1da177e4 LT |
569 | return status; |
570 | } | |
571 | ||
8e09f215 SW |
572 | static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr) |
573 | { | |
574 | cqr->status = DASD_CQR_FILLED; | |
575 | }; | |
576 | ||
fd49f41a | 577 | /* Fill in IOCTL data for device. */ |
1da177e4 LT |
578 | static int |
579 | dasd_diag_fill_info(struct dasd_device * device, | |
580 | struct dasd_information2_t * info) | |
581 | { | |
582 | struct dasd_diag_private *private; | |
583 | ||
584 | private = (struct dasd_diag_private *) device->private; | |
fd49f41a | 585 | info->label_block = (unsigned int) private->pt_block; |
1da177e4 LT |
586 | info->FBA_layout = 1; |
587 | info->format = DASD_FORMAT_LDL; | |
588 | info->characteristics_size = sizeof (struct dasd_diag_characteristics); | |
589 | memcpy(info->characteristics, | |
590 | &((struct dasd_diag_private *) device->private)->rdc_data, | |
591 | sizeof (struct dasd_diag_characteristics)); | |
592 | info->confdata_size = 0; | |
593 | return 0; | |
594 | } | |
595 | ||
596 | static void | |
597 | dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, | |
598 | struct irb *stat) | |
599 | { | |
fc19f381 | 600 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 LT |
601 | "dump sense not available for DIAG data"); |
602 | } | |
603 | ||
2b67fc46 | 604 | static struct dasd_discipline dasd_diag_discipline = { |
1da177e4 LT |
605 | .owner = THIS_MODULE, |
606 | .name = "DIAG", | |
607 | .ebcname = "DIAG", | |
fd49f41a | 608 | .max_blocks = DIAG_MAX_BLOCKS, |
1da177e4 LT |
609 | .check_device = dasd_diag_check_device, |
610 | .fill_geometry = dasd_diag_fill_geometry, | |
611 | .start_IO = dasd_start_diag, | |
fd49f41a | 612 | .term_IO = dasd_diag_term_IO, |
8e09f215 | 613 | .handle_terminated_request = dasd_diag_handle_terminated_request, |
1da177e4 LT |
614 | .erp_action = dasd_diag_erp_action, |
615 | .erp_postaction = dasd_diag_erp_postaction, | |
616 | .build_cp = dasd_diag_build_cp, | |
617 | .free_cp = dasd_diag_free_cp, | |
618 | .dump_sense = dasd_diag_dump_sense, | |
619 | .fill_info = dasd_diag_fill_info, | |
620 | }; | |
621 | ||
622 | static int __init | |
623 | dasd_diag_init(void) | |
624 | { | |
625 | if (!MACHINE_IS_VM) { | |
fc19f381 SH |
626 | pr_info("Discipline %s cannot be used without z/VM\n", |
627 | dasd_diag_discipline.name); | |
fd49f41a | 628 | return -ENODEV; |
1da177e4 LT |
629 | } |
630 | ASCEBC(dasd_diag_discipline.ebcname, 4); | |
631 | ||
632 | ctl_set_bit(0, 9); | |
633 | register_external_interrupt(0x2603, dasd_ext_handler); | |
634 | dasd_diag_discipline_pointer = &dasd_diag_discipline; | |
635 | return 0; | |
636 | } | |
637 | ||
638 | static void __exit | |
639 | dasd_diag_cleanup(void) | |
640 | { | |
1da177e4 LT |
641 | unregister_external_interrupt(0x2603, dasd_ext_handler); |
642 | ctl_clear_bit(0, 9); | |
643 | dasd_diag_discipline_pointer = NULL; | |
644 | } | |
645 | ||
646 | module_init(dasd_diag_init); | |
647 | module_exit(dasd_diag_cleanup); |