Commit | Line | Data |
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6a55d2cd | 1 | // SPDX-License-Identifier: GPL-2.0 |
138c014d | 2 | /* |
1da177e4 LT |
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> | |
a53c8fab | 7 | * Copyright IBM Corp. 1999, 2000 |
1da177e4 | 8 | * |
1da177e4 LT |
9 | */ |
10 | ||
052ff461 | 11 | #include <linux/kernel_stat.h> |
1da177e4 LT |
12 | #include <linux/stddef.h> |
13 | #include <linux/kernel.h> | |
14 | #include <linux/slab.h> | |
fd49f41a | 15 | #include <linux/hdreg.h> |
1da177e4 LT |
16 | #include <linux/bio.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/init.h> | |
fd49f41a | 19 | #include <linux/jiffies.h> |
d09a307f | 20 | #include <asm/asm-extable.h> |
1da177e4 LT |
21 | #include <asm/dasd.h> |
22 | #include <asm/debug.h> | |
1ec2772e | 23 | #include <asm/diag.h> |
1da177e4 | 24 | #include <asm/ebcdic.h> |
b378a982 | 25 | #include <linux/io.h> |
d7b250e2 | 26 | #include <asm/irq.h> |
56dc6a88 | 27 | #include <asm/vtoc.h> |
1da177e4 LT |
28 | |
29 | #include "dasd_int.h" | |
30 | #include "dasd_diag.h" | |
31 | ||
1da177e4 LT |
32 | MODULE_LICENSE("GPL"); |
33 | ||
fd49f41a HH |
34 | /* The maximum number of blocks per request (max_blocks) is dependent on the |
35 | * amount of storage that is available in the static I/O buffer for each | |
36 | * device. Currently each device gets 2 pages. We want to fit two requests | |
37 | * into the available memory so that we can immediately start the next if one | |
38 | * finishes. */ | |
39 | #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \ | |
40 | sizeof(struct dasd_diag_req)) / \ | |
41 | sizeof(struct dasd_diag_bio)) / 2) | |
42 | #define DIAG_MAX_RETRIES 32 | |
7c8faa86 | 43 | #define DIAG_TIMEOUT 50 |
fd49f41a | 44 | |
2b67fc46 | 45 | static struct dasd_discipline dasd_diag_discipline; |
1da177e4 LT |
46 | |
47 | struct dasd_diag_private { | |
48 | struct dasd_diag_characteristics rdc_data; | |
49 | struct dasd_diag_rw_io iob; | |
50 | struct dasd_diag_init_io iib; | |
fd49f41a | 51 | blocknum_t pt_block; |
9a92fe48 | 52 | struct ccw_dev_id dev_id; |
1da177e4 LT |
53 | }; |
54 | ||
55 | struct dasd_diag_req { | |
fd49f41a | 56 | unsigned int block_count; |
fa226f1d | 57 | struct dasd_diag_bio bio[]; |
1da177e4 LT |
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. */ | |
ce0c12b6 | 66 | static inline int __dia250(void *iob, int cmd) |
1da177e4 | 67 | { |
d4a01902 | 68 | union register_pair rx = { .even = (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; |
d4a01902 | 73 | int cc; |
1da177e4 | 74 | |
d4a01902 | 75 | cc = 3; |
94c12cc7 | 76 | asm volatile( |
d4a01902 HC |
77 | " diag %[rx],%[cmd],0x250\n" |
78 | "0: ipm %[cc]\n" | |
79 | " srl %[cc],28\n" | |
fd49f41a | 80 | "1:\n" |
94c12cc7 | 81 | EX_TABLE(0b,1b) |
d4a01902 HC |
82 | : [cc] "+&d" (cc), [rx] "+&d" (rx.pair), "+m" (*(addr_type *)iob) |
83 | : [cmd] "d" (cmd) | |
84 | : "cc"); | |
85 | return cc | rx.odd; | |
1da177e4 LT |
86 | } |
87 | ||
ce0c12b6 HC |
88 | static inline int dia250(void *iob, int cmd) |
89 | { | |
90 | diag_stat_inc(DIAG_STAT_X250); | |
91 | return __dia250(iob, cmd); | |
92 | } | |
93 | ||
fd49f41a HH |
94 | /* Initialize block I/O to DIAG device using the specified blocksize and |
95 | * block offset. On success, return zero and set end_block to contain the | |
96 | * number of blocks on the device minus the specified offset. Return non-zero | |
97 | * otherwise. */ | |
4d284cac | 98 | static inline int |
fd49f41a HH |
99 | mdsk_init_io(struct dasd_device *device, unsigned int blocksize, |
100 | blocknum_t offset, blocknum_t *end_block) | |
1da177e4 | 101 | { |
543691a4 SO |
102 | struct dasd_diag_private *private = device->private; |
103 | struct dasd_diag_init_io *iib = &private->iib; | |
1da177e4 LT |
104 | int rc; |
105 | ||
1da177e4 LT |
106 | memset(iib, 0, sizeof (struct dasd_diag_init_io)); |
107 | ||
9a92fe48 | 108 | iib->dev_nr = private->dev_id.devno; |
1da177e4 LT |
109 | iib->block_size = blocksize; |
110 | iib->offset = offset; | |
fd49f41a | 111 | iib->flaga = DASD_DIAG_FLAGA_DEFAULT; |
1da177e4 LT |
112 | |
113 | rc = dia250(iib, INIT_BIO); | |
114 | ||
fd49f41a HH |
115 | if ((rc & 3) == 0 && end_block) |
116 | *end_block = iib->end_block; | |
117 | ||
118 | return rc; | |
1da177e4 LT |
119 | } |
120 | ||
fd49f41a HH |
121 | /* Remove block I/O environment for device. Return zero on success, non-zero |
122 | * otherwise. */ | |
4d284cac | 123 | static inline int |
1da177e4 LT |
124 | mdsk_term_io(struct dasd_device * device) |
125 | { | |
543691a4 SO |
126 | struct dasd_diag_private *private = device->private; |
127 | struct dasd_diag_init_io *iib = &private->iib; | |
1da177e4 LT |
128 | int rc; |
129 | ||
1da177e4 | 130 | memset(iib, 0, sizeof (struct dasd_diag_init_io)); |
9a92fe48 | 131 | iib->dev_nr = private->dev_id.devno; |
1da177e4 | 132 | rc = dia250(iib, TERM_BIO); |
fd49f41a HH |
133 | return rc; |
134 | } | |
135 | ||
136 | /* Error recovery for failed DIAG requests - try to reestablish the DIAG | |
137 | * environment. */ | |
138 | static void | |
139 | dasd_diag_erp(struct dasd_device *device) | |
140 | { | |
141 | int rc; | |
142 | ||
143 | mdsk_term_io(device); | |
8e09f215 | 144 | rc = mdsk_init_io(device, device->block->bp_block, 0, NULL); |
22825ab7 | 145 | if (rc == 4) { |
33b62a30 | 146 | if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags))) |
baebc70a JP |
147 | pr_warn("%s: The access mode of a DIAG device changed to read-only\n", |
148 | dev_name(&device->cdev->dev)); | |
22825ab7 SW |
149 | rc = 0; |
150 | } | |
fd49f41a | 151 | if (rc) |
baebc70a JP |
152 | pr_warn("%s: DIAG ERP failed with rc=%d\n", |
153 | dev_name(&device->cdev->dev), rc); | |
1da177e4 LT |
154 | } |
155 | ||
fd49f41a HH |
156 | /* Start a given request at the device. Return zero on success, non-zero |
157 | * otherwise. */ | |
1da177e4 LT |
158 | static int |
159 | dasd_start_diag(struct dasd_ccw_req * cqr) | |
160 | { | |
161 | struct dasd_device *device; | |
162 | struct dasd_diag_private *private; | |
163 | struct dasd_diag_req *dreq; | |
164 | int rc; | |
165 | ||
8e09f215 | 166 | device = cqr->startdev; |
fd49f41a | 167 | if (cqr->retries < 0) { |
fc19f381 | 168 | DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p " |
fd49f41a | 169 | "- no retry left)", cqr); |
8e09f215 | 170 | cqr->status = DASD_CQR_ERROR; |
fd49f41a HH |
171 | return -EIO; |
172 | } | |
543691a4 SO |
173 | private = device->private; |
174 | dreq = cqr->data; | |
1da177e4 | 175 | |
9a92fe48 | 176 | private->iob.dev_nr = private->dev_id.devno; |
1da177e4 | 177 | private->iob.key = 0; |
fd49f41a | 178 | private->iob.flags = DASD_DIAG_RWFLAG_ASYNC; |
1da177e4 | 179 | private->iob.block_count = dreq->block_count; |
fd49f41a | 180 | private->iob.interrupt_params = (addr_t) cqr; |
86b368a5 | 181 | private->iob.bio_list = dreq->bio; |
fd49f41a | 182 | private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
1da177e4 | 183 | |
1aae0560 | 184 | cqr->startclk = get_tod_clock(); |
fd49f41a HH |
185 | cqr->starttime = jiffies; |
186 | cqr->retries--; | |
1da177e4 LT |
187 | |
188 | rc = dia250(&private->iob, RW_BIO); | |
fd49f41a HH |
189 | switch (rc) { |
190 | case 0: /* Synchronous I/O finished successfully */ | |
1aae0560 | 191 | cqr->stopclk = get_tod_clock(); |
8e09f215 | 192 | cqr->status = DASD_CQR_SUCCESS; |
fd49f41a HH |
193 | /* Indicate to calling function that only a dasd_schedule_bh() |
194 | and no timer is needed */ | |
195 | rc = -EACCES; | |
196 | break; | |
197 | case 8: /* Asynchronous I/O was started */ | |
1da177e4 LT |
198 | cqr->status = DASD_CQR_IN_IO; |
199 | rc = 0; | |
fd49f41a HH |
200 | break; |
201 | default: /* Error condition */ | |
202 | cqr->status = DASD_CQR_QUEUED; | |
fc19f381 | 203 | DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc); |
fd49f41a HH |
204 | dasd_diag_erp(device); |
205 | rc = -EIO; | |
206 | break; | |
1da177e4 | 207 | } |
6cc7f168 | 208 | cqr->intrc = rc; |
1da177e4 LT |
209 | return rc; |
210 | } | |
211 | ||
fd49f41a HH |
212 | /* Terminate given request at the device. */ |
213 | static int | |
214 | dasd_diag_term_IO(struct dasd_ccw_req * cqr) | |
215 | { | |
216 | struct dasd_device *device; | |
217 | ||
8e09f215 | 218 | device = cqr->startdev; |
fd49f41a | 219 | mdsk_term_io(device); |
8e09f215 SW |
220 | mdsk_init_io(device, device->block->bp_block, 0, NULL); |
221 | cqr->status = DASD_CQR_CLEAR_PENDING; | |
1aae0560 | 222 | cqr->stopclk = get_tod_clock(); |
8e09f215 | 223 | dasd_schedule_device_bh(device); |
fd49f41a HH |
224 | return 0; |
225 | } | |
226 | ||
227 | /* Handle external interruption. */ | |
fde15c3a | 228 | static void dasd_ext_handler(struct ext_code ext_code, |
f6649a7e | 229 | unsigned int param32, unsigned long param64) |
1da177e4 LT |
230 | { |
231 | struct dasd_ccw_req *cqr, *next; | |
232 | struct dasd_device *device; | |
7bf76f01 | 233 | unsigned long expires; |
1da177e4 | 234 | unsigned long flags; |
fd49f41a HH |
235 | addr_t ip; |
236 | int rc; | |
1da177e4 | 237 | |
fde15c3a | 238 | switch (ext_code.subcode >> 8) { |
fd49f41a | 239 | case DASD_DIAG_CODE_31BIT: |
f6649a7e | 240 | ip = (addr_t) param32; |
fd49f41a HH |
241 | break; |
242 | case DASD_DIAG_CODE_64BIT: | |
f6649a7e | 243 | ip = (addr_t) param64; |
fd49f41a HH |
244 | break; |
245 | default: | |
246 | return; | |
247 | } | |
420f42ec | 248 | inc_irq_stat(IRQEXT_DSD); |
1da177e4 | 249 | if (!ip) { /* no intparm: unsolicited interrupt */ |
fc19f381 SH |
250 | DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited " |
251 | "interrupt"); | |
1da177e4 LT |
252 | return; |
253 | } | |
fd49f41a | 254 | cqr = (struct dasd_ccw_req *) ip; |
8e09f215 | 255 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 256 | if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
fc19f381 | 257 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
258 | " magic number of dasd_ccw_req 0x%08X doesn't" |
259 | " match discipline 0x%08X", | |
260 | cqr->magic, *(int *) (&device->discipline->name)); | |
261 | return; | |
262 | } | |
263 | ||
264 | /* get irq lock to modify request queue */ | |
265 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
266 | ||
fd49f41a | 267 | /* Check for a pending clear operation */ |
8e09f215 SW |
268 | if (cqr->status == DASD_CQR_CLEAR_PENDING) { |
269 | cqr->status = DASD_CQR_CLEARED; | |
270 | dasd_device_clear_timer(device); | |
271 | dasd_schedule_device_bh(device); | |
fd49f41a HH |
272 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
273 | return; | |
274 | } | |
275 | ||
1aae0560 | 276 | cqr->stopclk = get_tod_clock(); |
1da177e4 LT |
277 | |
278 | expires = 0; | |
fde15c3a | 279 | if ((ext_code.subcode & 0xff) == 0) { |
8e09f215 | 280 | cqr->status = DASD_CQR_SUCCESS; |
1da177e4 LT |
281 | /* Start first request on queue if possible -> fast_io. */ |
282 | if (!list_empty(&device->ccw_queue)) { | |
283 | next = list_entry(device->ccw_queue.next, | |
8e09f215 | 284 | struct dasd_ccw_req, devlist); |
1da177e4 | 285 | if (next->status == DASD_CQR_QUEUED) { |
fd49f41a HH |
286 | rc = dasd_start_diag(next); |
287 | if (rc == 0) | |
1da177e4 | 288 | expires = next->expires; |
1da177e4 LT |
289 | } |
290 | } | |
fd49f41a HH |
291 | } else { |
292 | cqr->status = DASD_CQR_QUEUED; | |
fc19f381 | 293 | DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for " |
f6649a7e | 294 | "request %p was %d (%d retries left)", cqr, |
fde15c3a | 295 | ext_code.subcode & 0xff, cqr->retries); |
fd49f41a HH |
296 | dasd_diag_erp(device); |
297 | } | |
1da177e4 LT |
298 | |
299 | if (expires != 0) | |
8e09f215 | 300 | dasd_device_set_timer(device, expires); |
1da177e4 | 301 | else |
8e09f215 SW |
302 | dasd_device_clear_timer(device); |
303 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
304 | |
305 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
306 | } | |
307 | ||
fd49f41a HH |
308 | /* Check whether device can be controlled by DIAG discipline. Return zero on |
309 | * success, non-zero otherwise. */ | |
1da177e4 LT |
310 | static int |
311 | dasd_diag_check_device(struct dasd_device *device) | |
312 | { | |
543691a4 | 313 | struct dasd_diag_private *private = device->private; |
1da177e4 | 314 | struct dasd_diag_characteristics *rdc_data; |
56dc6a88 | 315 | struct vtoc_cms_label *label; |
543691a4 | 316 | struct dasd_block *block; |
9f4aa523 | 317 | struct dasd_diag_bio *bio; |
fd49f41a | 318 | unsigned int sb, bsize; |
543691a4 | 319 | blocknum_t end_block; |
1da177e4 LT |
320 | int rc; |
321 | ||
1da177e4 | 322 | if (private == NULL) { |
543691a4 | 323 | private = kzalloc(sizeof(*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); |
543691a4 | 331 | device->private = private; |
1da177e4 | 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 | 344 | /* Read Device Characteristics */ |
543691a4 | 345 | rdc_data = &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 | 356 | |
7c8faa86 | 357 | device->default_expires = DIAG_TIMEOUT; |
1f1ee9ad | 358 | device->default_retries = DIAG_MAX_RETRIES; |
7c8faa86 | 359 | |
1da177e4 LT |
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: | |
baebc70a JP |
369 | pr_warn("%s: Device type %d is not supported in DIAG mode\n", |
370 | dev_name(&device->cdev->dev), | |
371 | private->rdc_data.vdev_class); | |
8586cb60 | 372 | rc = -EOPNOTSUPP; |
7337194f | 373 | goto out; |
1da177e4 LT |
374 | } |
375 | ||
376 | DBF_DEV_EVENT(DBF_INFO, device, | |
377 | "%04X: %04X on real %04X/%02X", | |
378 | rdc_data->dev_nr, | |
379 | rdc_data->vdev_type, | |
380 | rdc_data->rdev_type, rdc_data->rdev_model); | |
381 | ||
382 | /* terminate all outstanding operations */ | |
383 | mdsk_term_io(device); | |
384 | ||
385 | /* figure out blocksize of device */ | |
56dc6a88 | 386 | label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); |
1da177e4 | 387 | if (label == NULL) { |
fc19f381 | 388 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 | 389 | "No memory to allocate initialization request"); |
7337194f CH |
390 | rc = -ENOMEM; |
391 | goto out; | |
1da177e4 | 392 | } |
9f4aa523 SH |
393 | bio = kzalloc(sizeof(*bio), GFP_KERNEL); |
394 | if (bio == NULL) { | |
395 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", | |
396 | "No memory to allocate initialization bio"); | |
397 | rc = -ENOMEM; | |
398 | goto out_label; | |
399 | } | |
fd49f41a HH |
400 | rc = 0; |
401 | end_block = 0; | |
1da177e4 LT |
402 | /* try all sizes - needed for ECKD devices */ |
403 | for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { | |
fd49f41a | 404 | mdsk_init_io(device, bsize, 0, &end_block); |
9f4aa523 SH |
405 | memset(bio, 0, sizeof(*bio)); |
406 | bio->type = MDSK_READ_REQ; | |
407 | bio->block_number = private->pt_block + 1; | |
408 | bio->buffer = label; | |
1da177e4 LT |
409 | memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); |
410 | private->iob.dev_nr = rdc_data->dev_nr; | |
411 | private->iob.key = 0; | |
412 | private->iob.flags = 0; /* do synchronous io */ | |
413 | private->iob.block_count = 1; | |
414 | private->iob.interrupt_params = 0; | |
9f4aa523 | 415 | private->iob.bio_list = bio; |
fd49f41a HH |
416 | private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
417 | rc = dia250(&private->iob, RW_BIO); | |
1e0291ba | 418 | if (rc == 3) { |
baebc70a JP |
419 | pr_warn("%s: A 64-bit DIAG call failed\n", |
420 | dev_name(&device->cdev->dev)); | |
1e0291ba | 421 | rc = -EOPNOTSUPP; |
9f4aa523 | 422 | goto out_bio; |
1e0291ba | 423 | } |
1da177e4 | 424 | mdsk_term_io(device); |
1e0291ba PO |
425 | if (rc == 0) |
426 | break; | |
1da177e4 | 427 | } |
1e0291ba | 428 | if (bsize > PAGE_SIZE) { |
baebc70a JP |
429 | pr_warn("%s: Accessing the DASD failed because of an incorrect format (rc=%d)\n", |
430 | dev_name(&device->cdev->dev), rc); | |
fd49f41a | 431 | rc = -EIO; |
9f4aa523 | 432 | goto out_bio; |
1e0291ba PO |
433 | } |
434 | /* check for label block */ | |
435 | if (memcmp(label->label_id, DASD_DIAG_CMS1, | |
436 | sizeof(DASD_DIAG_CMS1)) == 0) { | |
437 | /* get formatted blocksize from label block */ | |
438 | bsize = (unsigned int) label->block_size; | |
8e09f215 | 439 | block->blocks = (unsigned long) label->block_count; |
1e0291ba | 440 | } else |
8e09f215 SW |
441 | block->blocks = end_block; |
442 | block->bp_block = bsize; | |
443 | block->s2b_shift = 0; /* bits to shift 512 to get a block */ | |
1e0291ba | 444 | for (sb = 512; sb < bsize; sb = sb << 1) |
8e09f215 SW |
445 | block->s2b_shift++; |
446 | rc = mdsk_init_io(device, block->bp_block, 0, NULL); | |
22825ab7 | 447 | if (rc && (rc != 4)) { |
baebc70a JP |
448 | pr_warn("%s: DIAG initialization failed with rc=%d\n", |
449 | dev_name(&device->cdev->dev), rc); | |
1e0291ba | 450 | rc = -EIO; |
fd49f41a | 451 | } else { |
22825ab7 | 452 | if (rc == 4) |
33b62a30 | 453 | set_bit(DASD_FLAG_DEVICE_RO, &device->flags); |
ea058544 SH |
454 | pr_info("%s: New DASD with %ld byte/block, total size %ld " |
455 | "KB%s\n", dev_name(&device->cdev->dev), | |
456 | (unsigned long) block->bp_block, | |
457 | (unsigned long) (block->blocks << | |
458 | block->s2b_shift) >> 1, | |
459 | (rc == 4) ? ", read-only device" : ""); | |
22825ab7 | 460 | rc = 0; |
1da177e4 | 461 | } |
9f4aa523 SH |
462 | out_bio: |
463 | kfree(bio); | |
7337194f | 464 | out_label: |
1da177e4 | 465 | free_page((long) label); |
7337194f CH |
466 | out: |
467 | if (rc) { | |
468 | device->block = NULL; | |
469 | dasd_free_block(block); | |
470 | device->private = NULL; | |
471 | kfree(private); | |
472 | } | |
1da177e4 LT |
473 | return rc; |
474 | } | |
475 | ||
fd49f41a HH |
476 | /* Fill in virtual disk geometry for device. Return zero on success, non-zero |
477 | * otherwise. */ | |
1da177e4 | 478 | static int |
8e09f215 | 479 | dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo) |
1da177e4 | 480 | { |
8e09f215 | 481 | if (dasd_check_blocksize(block->bp_block) != 0) |
1da177e4 | 482 | return -EINVAL; |
8e09f215 | 483 | geo->cylinders = (block->blocks << block->s2b_shift) >> 10; |
1da177e4 | 484 | geo->heads = 16; |
8e09f215 | 485 | geo->sectors = 128 >> block->s2b_shift; |
1da177e4 LT |
486 | return 0; |
487 | } | |
488 | ||
1da177e4 LT |
489 | static dasd_erp_fn_t |
490 | dasd_diag_erp_action(struct dasd_ccw_req * cqr) | |
491 | { | |
492 | return dasd_default_erp_action; | |
493 | } | |
494 | ||
495 | static dasd_erp_fn_t | |
496 | dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) | |
497 | { | |
498 | return dasd_default_erp_postaction; | |
499 | } | |
500 | ||
fd49f41a HH |
501 | /* Create DASD request from block device request. Return pointer to new |
502 | * request on success, ERR_PTR otherwise. */ | |
8e09f215 SW |
503 | static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, |
504 | struct dasd_block *block, | |
505 | struct request *req) | |
1da177e4 LT |
506 | { |
507 | struct dasd_ccw_req *cqr; | |
508 | struct dasd_diag_req *dreq; | |
509 | struct dasd_diag_bio *dbio; | |
5705f702 | 510 | struct req_iterator iter; |
7988613b | 511 | struct bio_vec bv; |
1da177e4 | 512 | char *dst; |
10321aa1 | 513 | unsigned int count; |
1da177e4 | 514 | sector_t recid, first_rec, last_rec; |
fd49f41a | 515 | unsigned int blksize, off; |
1da177e4 | 516 | unsigned char rw_cmd; |
1da177e4 LT |
517 | |
518 | if (rq_data_dir(req) == READ) | |
519 | rw_cmd = MDSK_READ_REQ; | |
520 | else if (rq_data_dir(req) == WRITE) | |
521 | rw_cmd = MDSK_WRITE_REQ; | |
522 | else | |
523 | return ERR_PTR(-EINVAL); | |
8e09f215 | 524 | blksize = block->bp_block; |
1da177e4 | 525 | /* Calculate record id of first and last block. */ |
83096ebf TH |
526 | first_rec = blk_rq_pos(req) >> block->s2b_shift; |
527 | last_rec = | |
528 | (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; | |
1da177e4 LT |
529 | /* Check struct bio and count the number of blocks for the request. */ |
530 | count = 0; | |
5705f702 | 531 | rq_for_each_segment(bv, req, iter) { |
7988613b | 532 | if (bv.bv_len & (blksize - 1)) |
6c92e699 JA |
533 | /* Fba can only do full blocks. */ |
534 | return ERR_PTR(-EINVAL); | |
7988613b | 535 | count += bv.bv_len >> (block->s2b_shift + 9); |
1da177e4 LT |
536 | } |
537 | /* Paranoia. */ | |
538 | if (count != last_rec - first_rec + 1) | |
539 | return ERR_PTR(-EINVAL); | |
540 | /* Build the request */ | |
10321aa1 GS |
541 | cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, struct_size(dreq, bio, count), |
542 | memdev, blk_mq_rq_to_pdu(req)); | |
1da177e4 LT |
543 | if (IS_ERR(cqr)) |
544 | return cqr; | |
138c014d | 545 | |
1da177e4 LT |
546 | dreq = (struct dasd_diag_req *) cqr->data; |
547 | dreq->block_count = count; | |
548 | dbio = dreq->bio; | |
549 | recid = first_rec; | |
5705f702 | 550 | rq_for_each_segment(bv, req, iter) { |
bf5fb875 | 551 | dst = bvec_virt(&bv); |
7988613b | 552 | for (off = 0; off < bv.bv_len; off += blksize) { |
6c92e699 JA |
553 | memset(dbio, 0, sizeof (struct dasd_diag_bio)); |
554 | dbio->type = rw_cmd; | |
555 | dbio->block_number = recid + 1; | |
556 | dbio->buffer = dst; | |
557 | dbio++; | |
558 | dst += blksize; | |
559 | recid++; | |
560 | } | |
1da177e4 | 561 | } |
1f1ee9ad | 562 | cqr->retries = memdev->default_retries; |
1aae0560 | 563 | cqr->buildclk = get_tod_clock(); |
13de227b HS |
564 | if (blk_noretry_request(req) || |
565 | block->base->features & DASD_FEATURE_FAILFAST) | |
1c01b8a5 | 566 | set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); |
8e09f215 SW |
567 | cqr->startdev = memdev; |
568 | cqr->memdev = memdev; | |
569 | cqr->block = block; | |
7c8faa86 | 570 | cqr->expires = memdev->default_expires * HZ; |
1da177e4 LT |
571 | cqr->status = DASD_CQR_FILLED; |
572 | return cqr; | |
573 | } | |
574 | ||
fd49f41a HH |
575 | /* Release DASD request. Return non-zero if request was successful, zero |
576 | * otherwise. */ | |
1da177e4 LT |
577 | static int |
578 | dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) | |
579 | { | |
580 | int status; | |
581 | ||
582 | status = cqr->status == DASD_CQR_DONE; | |
8e09f215 | 583 | dasd_sfree_request(cqr, cqr->memdev); |
1da177e4 LT |
584 | return status; |
585 | } | |
586 | ||
8e09f215 SW |
587 | static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr) |
588 | { | |
a2ace466 HR |
589 | if (cqr->retries < 0) |
590 | cqr->status = DASD_CQR_FAILED; | |
591 | else | |
592 | cqr->status = DASD_CQR_FILLED; | |
8e09f215 SW |
593 | }; |
594 | ||
fd49f41a | 595 | /* Fill in IOCTL data for device. */ |
1da177e4 LT |
596 | static int |
597 | dasd_diag_fill_info(struct dasd_device * device, | |
598 | struct dasd_information2_t * info) | |
599 | { | |
543691a4 | 600 | struct dasd_diag_private *private = device->private; |
1da177e4 | 601 | |
fd49f41a | 602 | info->label_block = (unsigned int) private->pt_block; |
1da177e4 LT |
603 | info->FBA_layout = 1; |
604 | info->format = DASD_FORMAT_LDL; | |
543691a4 SO |
605 | info->characteristics_size = sizeof(private->rdc_data); |
606 | memcpy(info->characteristics, &private->rdc_data, | |
607 | sizeof(private->rdc_data)); | |
1da177e4 LT |
608 | info->confdata_size = 0; |
609 | return 0; | |
610 | } | |
611 | ||
612 | static void | |
613 | dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, | |
614 | struct irb *stat) | |
615 | { | |
fc19f381 | 616 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 LT |
617 | "dump sense not available for DIAG data"); |
618 | } | |
619 | ||
0127a47f | 620 | static unsigned int dasd_diag_max_sectors(struct dasd_block *block) |
a0610a8a | 621 | { |
0127a47f | 622 | return DIAG_MAX_BLOCKS << block->s2b_shift; |
a0610a8a JH |
623 | } |
624 | ||
c0c8a839 SH |
625 | static int dasd_diag_pe_handler(struct dasd_device *device, |
626 | __u8 tbvpm, __u8 fcsecpm) | |
627 | { | |
628 | return dasd_generic_verify_path(device, tbvpm); | |
629 | } | |
630 | ||
2b67fc46 | 631 | static struct dasd_discipline dasd_diag_discipline = { |
1da177e4 LT |
632 | .owner = THIS_MODULE, |
633 | .name = "DIAG", | |
634 | .ebcname = "DIAG", | |
0127a47f | 635 | .max_sectors = dasd_diag_max_sectors, |
1da177e4 | 636 | .check_device = dasd_diag_check_device, |
c0c8a839 | 637 | .pe_handler = dasd_diag_pe_handler, |
1da177e4 LT |
638 | .fill_geometry = dasd_diag_fill_geometry, |
639 | .start_IO = dasd_start_diag, | |
fd49f41a | 640 | .term_IO = dasd_diag_term_IO, |
8e09f215 | 641 | .handle_terminated_request = dasd_diag_handle_terminated_request, |
1da177e4 LT |
642 | .erp_action = dasd_diag_erp_action, |
643 | .erp_postaction = dasd_diag_erp_postaction, | |
644 | .build_cp = dasd_diag_build_cp, | |
645 | .free_cp = dasd_diag_free_cp, | |
646 | .dump_sense = dasd_diag_dump_sense, | |
647 | .fill_info = dasd_diag_fill_info, | |
648 | }; | |
649 | ||
650 | static int __init | |
651 | dasd_diag_init(void) | |
652 | { | |
653 | if (!MACHINE_IS_VM) { | |
fc19f381 SH |
654 | pr_info("Discipline %s cannot be used without z/VM\n", |
655 | dasd_diag_discipline.name); | |
fd49f41a | 656 | return -ENODEV; |
1da177e4 LT |
657 | } |
658 | ASCEBC(dasd_diag_discipline.ebcname, 4); | |
659 | ||
82003c3e | 660 | irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); |
1dad093b | 661 | register_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler); |
1da177e4 LT |
662 | dasd_diag_discipline_pointer = &dasd_diag_discipline; |
663 | return 0; | |
664 | } | |
665 | ||
666 | static void __exit | |
667 | dasd_diag_cleanup(void) | |
668 | { | |
1dad093b | 669 | unregister_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler); |
82003c3e | 670 | irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL); |
1da177e4 LT |
671 | dasd_diag_discipline_pointer = NULL; |
672 | } | |
673 | ||
674 | module_init(dasd_diag_init); | |
675 | module_exit(dasd_diag_cleanup); |