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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 | ||
ea058544 | 11 | #define KMSG_COMPONENT "dasd" |
fc19f381 | 12 | |
052ff461 | 13 | #include <linux/kernel_stat.h> |
1da177e4 LT |
14 | #include <linux/stddef.h> |
15 | #include <linux/kernel.h> | |
16 | #include <linux/slab.h> | |
fd49f41a | 17 | #include <linux/hdreg.h> |
1da177e4 LT |
18 | #include <linux/bio.h> |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
fd49f41a | 21 | #include <linux/jiffies.h> |
1da177e4 LT |
22 | |
23 | #include <asm/dasd.h> | |
24 | #include <asm/debug.h> | |
1ec2772e | 25 | #include <asm/diag.h> |
1da177e4 LT |
26 | #include <asm/ebcdic.h> |
27 | #include <asm/io.h> | |
d7b250e2 | 28 | #include <asm/irq.h> |
56dc6a88 | 29 | #include <asm/vtoc.h> |
0a87c5cf | 30 | #include <asm/diag.h> |
1da177e4 LT |
31 | |
32 | #include "dasd_int.h" | |
33 | #include "dasd_diag.h" | |
34 | ||
1da177e4 LT |
35 | #define PRINTK_HEADER "dasd(diag):" |
36 | ||
37 | MODULE_LICENSE("GPL"); | |
38 | ||
fd49f41a HH |
39 | /* The maximum number of blocks per request (max_blocks) is dependent on the |
40 | * amount of storage that is available in the static I/O buffer for each | |
41 | * device. Currently each device gets 2 pages. We want to fit two requests | |
42 | * into the available memory so that we can immediately start the next if one | |
43 | * finishes. */ | |
44 | #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \ | |
45 | sizeof(struct dasd_diag_req)) / \ | |
46 | sizeof(struct dasd_diag_bio)) / 2) | |
47 | #define DIAG_MAX_RETRIES 32 | |
7c8faa86 | 48 | #define DIAG_TIMEOUT 50 |
fd49f41a | 49 | |
2b67fc46 | 50 | static struct dasd_discipline dasd_diag_discipline; |
1da177e4 LT |
51 | |
52 | struct dasd_diag_private { | |
53 | struct dasd_diag_characteristics rdc_data; | |
54 | struct dasd_diag_rw_io iob; | |
55 | struct dasd_diag_init_io iib; | |
fd49f41a | 56 | blocknum_t pt_block; |
9a92fe48 | 57 | struct ccw_dev_id dev_id; |
1da177e4 LT |
58 | }; |
59 | ||
60 | struct dasd_diag_req { | |
fd49f41a | 61 | unsigned int block_count; |
1da177e4 LT |
62 | struct dasd_diag_bio bio[0]; |
63 | }; | |
64 | ||
fd49f41a HH |
65 | static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */ |
66 | ||
67 | /* Perform DIAG250 call with block I/O parameter list iob (input and output) | |
68 | * and function code cmd. | |
69 | * In case of an exception return 3. Otherwise return result of bitwise OR of | |
70 | * resulting condition code and DIAG return code. */ | |
ce0c12b6 | 71 | static inline int __dia250(void *iob, int cmd) |
1da177e4 | 72 | { |
04439694 | 73 | register unsigned long reg2 asm ("2") = (unsigned long) iob; |
86b368a5 PO |
74 | typedef union { |
75 | struct dasd_diag_init_io init_io; | |
76 | struct dasd_diag_rw_io rw_io; | |
fd49f41a | 77 | } addr_type; |
1da177e4 LT |
78 | int rc; |
79 | ||
94c12cc7 MS |
80 | rc = 3; |
81 | asm volatile( | |
04439694 | 82 | " diag 2,%2,0x250\n" |
fd49f41a HH |
83 | "0: ipm %0\n" |
84 | " srl %0,28\n" | |
04439694 | 85 | " or %0,3\n" |
fd49f41a | 86 | "1:\n" |
94c12cc7 MS |
87 | EX_TABLE(0b,1b) |
88 | : "+d" (rc), "=m" (*(addr_type *) iob) | |
04439694 PO |
89 | : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob) |
90 | : "3", "cc"); | |
1da177e4 LT |
91 | return rc; |
92 | } | |
93 | ||
ce0c12b6 HC |
94 | static inline int dia250(void *iob, int cmd) |
95 | { | |
96 | diag_stat_inc(DIAG_STAT_X250); | |
97 | return __dia250(iob, cmd); | |
98 | } | |
99 | ||
fd49f41a HH |
100 | /* Initialize block I/O to DIAG device using the specified blocksize and |
101 | * block offset. On success, return zero and set end_block to contain the | |
102 | * number of blocks on the device minus the specified offset. Return non-zero | |
103 | * otherwise. */ | |
4d284cac | 104 | static inline int |
fd49f41a HH |
105 | mdsk_init_io(struct dasd_device *device, unsigned int blocksize, |
106 | blocknum_t offset, blocknum_t *end_block) | |
1da177e4 | 107 | { |
543691a4 SO |
108 | struct dasd_diag_private *private = device->private; |
109 | struct dasd_diag_init_io *iib = &private->iib; | |
1da177e4 LT |
110 | int rc; |
111 | ||
1da177e4 LT |
112 | memset(iib, 0, sizeof (struct dasd_diag_init_io)); |
113 | ||
9a92fe48 | 114 | iib->dev_nr = private->dev_id.devno; |
1da177e4 LT |
115 | iib->block_size = blocksize; |
116 | iib->offset = offset; | |
fd49f41a | 117 | iib->flaga = DASD_DIAG_FLAGA_DEFAULT; |
1da177e4 LT |
118 | |
119 | rc = dia250(iib, INIT_BIO); | |
120 | ||
fd49f41a HH |
121 | if ((rc & 3) == 0 && end_block) |
122 | *end_block = iib->end_block; | |
123 | ||
124 | return rc; | |
1da177e4 LT |
125 | } |
126 | ||
fd49f41a HH |
127 | /* Remove block I/O environment for device. Return zero on success, non-zero |
128 | * otherwise. */ | |
4d284cac | 129 | static inline int |
1da177e4 LT |
130 | mdsk_term_io(struct dasd_device * device) |
131 | { | |
543691a4 SO |
132 | struct dasd_diag_private *private = device->private; |
133 | struct dasd_diag_init_io *iib = &private->iib; | |
1da177e4 LT |
134 | int rc; |
135 | ||
1da177e4 | 136 | memset(iib, 0, sizeof (struct dasd_diag_init_io)); |
9a92fe48 | 137 | iib->dev_nr = private->dev_id.devno; |
1da177e4 | 138 | rc = dia250(iib, TERM_BIO); |
fd49f41a HH |
139 | return rc; |
140 | } | |
141 | ||
142 | /* Error recovery for failed DIAG requests - try to reestablish the DIAG | |
143 | * environment. */ | |
144 | static void | |
145 | dasd_diag_erp(struct dasd_device *device) | |
146 | { | |
147 | int rc; | |
148 | ||
149 | mdsk_term_io(device); | |
8e09f215 | 150 | rc = mdsk_init_io(device, device->block->bp_block, 0, NULL); |
22825ab7 | 151 | if (rc == 4) { |
33b62a30 | 152 | if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags))) |
baebc70a JP |
153 | pr_warn("%s: The access mode of a DIAG device changed to read-only\n", |
154 | dev_name(&device->cdev->dev)); | |
22825ab7 SW |
155 | rc = 0; |
156 | } | |
fd49f41a | 157 | if (rc) |
baebc70a JP |
158 | pr_warn("%s: DIAG ERP failed with rc=%d\n", |
159 | dev_name(&device->cdev->dev), rc); | |
1da177e4 LT |
160 | } |
161 | ||
fd49f41a HH |
162 | /* Start a given request at the device. Return zero on success, non-zero |
163 | * otherwise. */ | |
1da177e4 LT |
164 | static int |
165 | dasd_start_diag(struct dasd_ccw_req * cqr) | |
166 | { | |
167 | struct dasd_device *device; | |
168 | struct dasd_diag_private *private; | |
169 | struct dasd_diag_req *dreq; | |
170 | int rc; | |
171 | ||
8e09f215 | 172 | device = cqr->startdev; |
fd49f41a | 173 | if (cqr->retries < 0) { |
fc19f381 | 174 | DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p " |
fd49f41a | 175 | "- no retry left)", cqr); |
8e09f215 | 176 | cqr->status = DASD_CQR_ERROR; |
fd49f41a HH |
177 | return -EIO; |
178 | } | |
543691a4 SO |
179 | private = device->private; |
180 | dreq = cqr->data; | |
1da177e4 | 181 | |
9a92fe48 | 182 | private->iob.dev_nr = private->dev_id.devno; |
1da177e4 | 183 | private->iob.key = 0; |
fd49f41a | 184 | private->iob.flags = DASD_DIAG_RWFLAG_ASYNC; |
1da177e4 | 185 | private->iob.block_count = dreq->block_count; |
fd49f41a | 186 | private->iob.interrupt_params = (addr_t) cqr; |
86b368a5 | 187 | private->iob.bio_list = dreq->bio; |
fd49f41a | 188 | private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
1da177e4 | 189 | |
1aae0560 | 190 | cqr->startclk = get_tod_clock(); |
fd49f41a HH |
191 | cqr->starttime = jiffies; |
192 | cqr->retries--; | |
1da177e4 LT |
193 | |
194 | rc = dia250(&private->iob, RW_BIO); | |
fd49f41a HH |
195 | switch (rc) { |
196 | case 0: /* Synchronous I/O finished successfully */ | |
1aae0560 | 197 | cqr->stopclk = get_tod_clock(); |
8e09f215 | 198 | cqr->status = DASD_CQR_SUCCESS; |
fd49f41a HH |
199 | /* Indicate to calling function that only a dasd_schedule_bh() |
200 | and no timer is needed */ | |
201 | rc = -EACCES; | |
202 | break; | |
203 | case 8: /* Asynchronous I/O was started */ | |
1da177e4 LT |
204 | cqr->status = DASD_CQR_IN_IO; |
205 | rc = 0; | |
fd49f41a HH |
206 | break; |
207 | default: /* Error condition */ | |
208 | cqr->status = DASD_CQR_QUEUED; | |
fc19f381 | 209 | DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc); |
fd49f41a HH |
210 | dasd_diag_erp(device); |
211 | rc = -EIO; | |
212 | break; | |
1da177e4 | 213 | } |
6cc7f168 | 214 | cqr->intrc = rc; |
1da177e4 LT |
215 | return rc; |
216 | } | |
217 | ||
fd49f41a HH |
218 | /* Terminate given request at the device. */ |
219 | static int | |
220 | dasd_diag_term_IO(struct dasd_ccw_req * cqr) | |
221 | { | |
222 | struct dasd_device *device; | |
223 | ||
8e09f215 | 224 | device = cqr->startdev; |
fd49f41a | 225 | mdsk_term_io(device); |
8e09f215 SW |
226 | mdsk_init_io(device, device->block->bp_block, 0, NULL); |
227 | cqr->status = DASD_CQR_CLEAR_PENDING; | |
1aae0560 | 228 | cqr->stopclk = get_tod_clock(); |
8e09f215 | 229 | dasd_schedule_device_bh(device); |
fd49f41a HH |
230 | return 0; |
231 | } | |
232 | ||
233 | /* Handle external interruption. */ | |
fde15c3a | 234 | static void dasd_ext_handler(struct ext_code ext_code, |
f6649a7e | 235 | unsigned int param32, unsigned long param64) |
1da177e4 LT |
236 | { |
237 | struct dasd_ccw_req *cqr, *next; | |
238 | struct dasd_device *device; | |
7bf76f01 | 239 | unsigned long expires; |
1da177e4 | 240 | unsigned long flags; |
fd49f41a HH |
241 | addr_t ip; |
242 | int rc; | |
1da177e4 | 243 | |
fde15c3a | 244 | switch (ext_code.subcode >> 8) { |
fd49f41a | 245 | case DASD_DIAG_CODE_31BIT: |
f6649a7e | 246 | ip = (addr_t) param32; |
fd49f41a HH |
247 | break; |
248 | case DASD_DIAG_CODE_64BIT: | |
f6649a7e | 249 | ip = (addr_t) param64; |
fd49f41a HH |
250 | break; |
251 | default: | |
252 | return; | |
253 | } | |
420f42ec | 254 | inc_irq_stat(IRQEXT_DSD); |
1da177e4 | 255 | if (!ip) { /* no intparm: unsolicited interrupt */ |
fc19f381 SH |
256 | DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited " |
257 | "interrupt"); | |
1da177e4 LT |
258 | return; |
259 | } | |
fd49f41a | 260 | cqr = (struct dasd_ccw_req *) ip; |
8e09f215 | 261 | device = (struct dasd_device *) cqr->startdev; |
1da177e4 | 262 | if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) { |
fc19f381 | 263 | DBF_DEV_EVENT(DBF_WARNING, device, |
1da177e4 LT |
264 | " magic number of dasd_ccw_req 0x%08X doesn't" |
265 | " match discipline 0x%08X", | |
266 | cqr->magic, *(int *) (&device->discipline->name)); | |
267 | return; | |
268 | } | |
269 | ||
270 | /* get irq lock to modify request queue */ | |
271 | spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); | |
272 | ||
fd49f41a | 273 | /* Check for a pending clear operation */ |
8e09f215 SW |
274 | if (cqr->status == DASD_CQR_CLEAR_PENDING) { |
275 | cqr->status = DASD_CQR_CLEARED; | |
276 | dasd_device_clear_timer(device); | |
277 | dasd_schedule_device_bh(device); | |
fd49f41a HH |
278 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); |
279 | return; | |
280 | } | |
281 | ||
1aae0560 | 282 | cqr->stopclk = get_tod_clock(); |
1da177e4 LT |
283 | |
284 | expires = 0; | |
fde15c3a | 285 | if ((ext_code.subcode & 0xff) == 0) { |
8e09f215 | 286 | cqr->status = DASD_CQR_SUCCESS; |
1da177e4 LT |
287 | /* Start first request on queue if possible -> fast_io. */ |
288 | if (!list_empty(&device->ccw_queue)) { | |
289 | next = list_entry(device->ccw_queue.next, | |
8e09f215 | 290 | struct dasd_ccw_req, devlist); |
1da177e4 | 291 | if (next->status == DASD_CQR_QUEUED) { |
fd49f41a HH |
292 | rc = dasd_start_diag(next); |
293 | if (rc == 0) | |
1da177e4 | 294 | expires = next->expires; |
1da177e4 LT |
295 | } |
296 | } | |
fd49f41a HH |
297 | } else { |
298 | cqr->status = DASD_CQR_QUEUED; | |
fc19f381 | 299 | DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for " |
f6649a7e | 300 | "request %p was %d (%d retries left)", cqr, |
fde15c3a | 301 | ext_code.subcode & 0xff, cqr->retries); |
fd49f41a HH |
302 | dasd_diag_erp(device); |
303 | } | |
1da177e4 LT |
304 | |
305 | if (expires != 0) | |
8e09f215 | 306 | dasd_device_set_timer(device, expires); |
1da177e4 | 307 | else |
8e09f215 SW |
308 | dasd_device_clear_timer(device); |
309 | dasd_schedule_device_bh(device); | |
1da177e4 LT |
310 | |
311 | spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); | |
312 | } | |
313 | ||
fd49f41a HH |
314 | /* Check whether device can be controlled by DIAG discipline. Return zero on |
315 | * success, non-zero otherwise. */ | |
1da177e4 LT |
316 | static int |
317 | dasd_diag_check_device(struct dasd_device *device) | |
318 | { | |
543691a4 | 319 | struct dasd_diag_private *private = device->private; |
1da177e4 | 320 | struct dasd_diag_characteristics *rdc_data; |
56dc6a88 | 321 | struct vtoc_cms_label *label; |
543691a4 SO |
322 | struct dasd_block *block; |
323 | struct dasd_diag_bio bio; | |
fd49f41a | 324 | unsigned int sb, bsize; |
543691a4 | 325 | blocknum_t end_block; |
1da177e4 LT |
326 | int rc; |
327 | ||
1da177e4 | 328 | if (private == NULL) { |
543691a4 | 329 | private = kzalloc(sizeof(*private), GFP_KERNEL); |
1da177e4 | 330 | if (private == NULL) { |
fc19f381 SH |
331 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
332 | "Allocating memory for private DASD data " | |
333 | "failed\n"); | |
1da177e4 LT |
334 | return -ENOMEM; |
335 | } | |
9a92fe48 | 336 | ccw_device_get_id(device->cdev, &private->dev_id); |
543691a4 | 337 | device->private = private; |
1da177e4 | 338 | } |
8e09f215 SW |
339 | block = dasd_alloc_block(); |
340 | if (IS_ERR(block)) { | |
fc19f381 | 341 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
8e09f215 | 342 | "could not allocate dasd block structure"); |
7337194f CH |
343 | device->private = NULL; |
344 | kfree(private); | |
8e09f215 SW |
345 | return PTR_ERR(block); |
346 | } | |
347 | device->block = block; | |
348 | block->base = device; | |
349 | ||
1da177e4 | 350 | /* Read Device Characteristics */ |
543691a4 | 351 | rdc_data = &private->rdc_data; |
9a92fe48 | 352 | rdc_data->dev_nr = private->dev_id.devno; |
1da177e4 LT |
353 | rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics); |
354 | ||
355 | rc = diag210((struct diag210 *) rdc_data); | |
fd49f41a | 356 | if (rc) { |
fc19f381 | 357 | DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device " |
fd49f41a | 358 | "information (rc=%d)", rc); |
8586cb60 | 359 | rc = -EOPNOTSUPP; |
7337194f | 360 | goto out; |
fd49f41a | 361 | } |
1da177e4 | 362 | |
7c8faa86 | 363 | device->default_expires = DIAG_TIMEOUT; |
1f1ee9ad | 364 | device->default_retries = DIAG_MAX_RETRIES; |
7c8faa86 | 365 | |
1da177e4 LT |
366 | /* Figure out position of label block */ |
367 | switch (private->rdc_data.vdev_class) { | |
368 | case DEV_CLASS_FBA: | |
369 | private->pt_block = 1; | |
370 | break; | |
371 | case DEV_CLASS_ECKD: | |
372 | private->pt_block = 2; | |
373 | break; | |
374 | default: | |
baebc70a JP |
375 | pr_warn("%s: Device type %d is not supported in DIAG mode\n", |
376 | dev_name(&device->cdev->dev), | |
377 | private->rdc_data.vdev_class); | |
8586cb60 | 378 | rc = -EOPNOTSUPP; |
7337194f | 379 | goto out; |
1da177e4 LT |
380 | } |
381 | ||
382 | DBF_DEV_EVENT(DBF_INFO, device, | |
383 | "%04X: %04X on real %04X/%02X", | |
384 | rdc_data->dev_nr, | |
385 | rdc_data->vdev_type, | |
386 | rdc_data->rdev_type, rdc_data->rdev_model); | |
387 | ||
388 | /* terminate all outstanding operations */ | |
389 | mdsk_term_io(device); | |
390 | ||
391 | /* figure out blocksize of device */ | |
56dc6a88 | 392 | label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL); |
1da177e4 | 393 | if (label == NULL) { |
fc19f381 | 394 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 | 395 | "No memory to allocate initialization request"); |
7337194f CH |
396 | rc = -ENOMEM; |
397 | goto out; | |
1da177e4 | 398 | } |
fd49f41a HH |
399 | rc = 0; |
400 | end_block = 0; | |
1da177e4 LT |
401 | /* try all sizes - needed for ECKD devices */ |
402 | for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) { | |
fd49f41a | 403 | mdsk_init_io(device, bsize, 0, &end_block); |
1da177e4 LT |
404 | memset(&bio, 0, sizeof (struct dasd_diag_bio)); |
405 | bio.type = MDSK_READ_REQ; | |
406 | bio.block_number = private->pt_block + 1; | |
86b368a5 | 407 | bio.buffer = label; |
1da177e4 LT |
408 | memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io)); |
409 | private->iob.dev_nr = rdc_data->dev_nr; | |
410 | private->iob.key = 0; | |
411 | private->iob.flags = 0; /* do synchronous io */ | |
412 | private->iob.block_count = 1; | |
413 | private->iob.interrupt_params = 0; | |
86b368a5 | 414 | private->iob.bio_list = &bio; |
fd49f41a HH |
415 | private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT; |
416 | rc = dia250(&private->iob, RW_BIO); | |
1e0291ba | 417 | if (rc == 3) { |
baebc70a JP |
418 | pr_warn("%s: A 64-bit DIAG call failed\n", |
419 | dev_name(&device->cdev->dev)); | |
1e0291ba | 420 | rc = -EOPNOTSUPP; |
7337194f | 421 | goto out_label; |
1e0291ba | 422 | } |
1da177e4 | 423 | mdsk_term_io(device); |
1e0291ba PO |
424 | if (rc == 0) |
425 | break; | |
1da177e4 | 426 | } |
1e0291ba | 427 | if (bsize > PAGE_SIZE) { |
baebc70a JP |
428 | pr_warn("%s: Accessing the DASD failed because of an incorrect format (rc=%d)\n", |
429 | dev_name(&device->cdev->dev), rc); | |
fd49f41a | 430 | rc = -EIO; |
7337194f | 431 | goto out_label; |
1e0291ba PO |
432 | } |
433 | /* check for label block */ | |
434 | if (memcmp(label->label_id, DASD_DIAG_CMS1, | |
435 | sizeof(DASD_DIAG_CMS1)) == 0) { | |
436 | /* get formatted blocksize from label block */ | |
437 | bsize = (unsigned int) label->block_size; | |
8e09f215 | 438 | block->blocks = (unsigned long) label->block_count; |
1e0291ba | 439 | } else |
8e09f215 SW |
440 | block->blocks = end_block; |
441 | block->bp_block = bsize; | |
442 | block->s2b_shift = 0; /* bits to shift 512 to get a block */ | |
1e0291ba | 443 | for (sb = 512; sb < bsize; sb = sb << 1) |
8e09f215 SW |
444 | block->s2b_shift++; |
445 | rc = mdsk_init_io(device, block->bp_block, 0, NULL); | |
22825ab7 | 446 | if (rc && (rc != 4)) { |
baebc70a JP |
447 | pr_warn("%s: DIAG initialization failed with rc=%d\n", |
448 | dev_name(&device->cdev->dev), rc); | |
1e0291ba | 449 | rc = -EIO; |
fd49f41a | 450 | } else { |
22825ab7 | 451 | if (rc == 4) |
33b62a30 | 452 | set_bit(DASD_FLAG_DEVICE_RO, &device->flags); |
ea058544 SH |
453 | pr_info("%s: New DASD with %ld byte/block, total size %ld " |
454 | "KB%s\n", dev_name(&device->cdev->dev), | |
455 | (unsigned long) block->bp_block, | |
456 | (unsigned long) (block->blocks << | |
457 | block->s2b_shift) >> 1, | |
458 | (rc == 4) ? ", read-only device" : ""); | |
22825ab7 | 459 | rc = 0; |
1da177e4 | 460 | } |
7337194f | 461 | out_label: |
1da177e4 | 462 | free_page((long) label); |
7337194f CH |
463 | out: |
464 | if (rc) { | |
465 | device->block = NULL; | |
466 | dasd_free_block(block); | |
467 | device->private = NULL; | |
468 | kfree(private); | |
469 | } | |
1da177e4 LT |
470 | return rc; |
471 | } | |
472 | ||
fd49f41a HH |
473 | /* Fill in virtual disk geometry for device. Return zero on success, non-zero |
474 | * otherwise. */ | |
1da177e4 | 475 | static int |
8e09f215 | 476 | dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo) |
1da177e4 | 477 | { |
8e09f215 | 478 | if (dasd_check_blocksize(block->bp_block) != 0) |
1da177e4 | 479 | return -EINVAL; |
8e09f215 | 480 | geo->cylinders = (block->blocks << block->s2b_shift) >> 10; |
1da177e4 | 481 | geo->heads = 16; |
8e09f215 | 482 | geo->sectors = 128 >> block->s2b_shift; |
1da177e4 LT |
483 | return 0; |
484 | } | |
485 | ||
1da177e4 LT |
486 | static dasd_erp_fn_t |
487 | dasd_diag_erp_action(struct dasd_ccw_req * cqr) | |
488 | { | |
489 | return dasd_default_erp_action; | |
490 | } | |
491 | ||
492 | static dasd_erp_fn_t | |
493 | dasd_diag_erp_postaction(struct dasd_ccw_req * cqr) | |
494 | { | |
495 | return dasd_default_erp_postaction; | |
496 | } | |
497 | ||
fd49f41a HH |
498 | /* Create DASD request from block device request. Return pointer to new |
499 | * request on success, ERR_PTR otherwise. */ | |
8e09f215 SW |
500 | static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev, |
501 | struct dasd_block *block, | |
502 | struct request *req) | |
1da177e4 LT |
503 | { |
504 | struct dasd_ccw_req *cqr; | |
505 | struct dasd_diag_req *dreq; | |
506 | struct dasd_diag_bio *dbio; | |
5705f702 | 507 | struct req_iterator iter; |
7988613b | 508 | struct bio_vec bv; |
1da177e4 | 509 | char *dst; |
fd49f41a | 510 | unsigned int count, datasize; |
1da177e4 | 511 | sector_t recid, first_rec, last_rec; |
fd49f41a | 512 | unsigned int blksize, off; |
1da177e4 | 513 | unsigned char rw_cmd; |
1da177e4 LT |
514 | |
515 | if (rq_data_dir(req) == READ) | |
516 | rw_cmd = MDSK_READ_REQ; | |
517 | else if (rq_data_dir(req) == WRITE) | |
518 | rw_cmd = MDSK_WRITE_REQ; | |
519 | else | |
520 | return ERR_PTR(-EINVAL); | |
8e09f215 | 521 | blksize = block->bp_block; |
1da177e4 | 522 | /* Calculate record id of first and last block. */ |
83096ebf TH |
523 | first_rec = blk_rq_pos(req) >> block->s2b_shift; |
524 | last_rec = | |
525 | (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift; | |
1da177e4 LT |
526 | /* Check struct bio and count the number of blocks for the request. */ |
527 | count = 0; | |
5705f702 | 528 | rq_for_each_segment(bv, req, iter) { |
7988613b | 529 | if (bv.bv_len & (blksize - 1)) |
6c92e699 JA |
530 | /* Fba can only do full blocks. */ |
531 | return ERR_PTR(-EINVAL); | |
7988613b | 532 | count += bv.bv_len >> (block->s2b_shift + 9); |
1da177e4 LT |
533 | } |
534 | /* Paranoia. */ | |
535 | if (count != last_rec - first_rec + 1) | |
536 | return ERR_PTR(-EINVAL); | |
537 | /* Build the request */ | |
538 | datasize = sizeof(struct dasd_diag_req) + | |
539 | count*sizeof(struct dasd_diag_bio); | |
68b781fe | 540 | cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev); |
1da177e4 LT |
541 | if (IS_ERR(cqr)) |
542 | return cqr; | |
138c014d | 543 | |
1da177e4 LT |
544 | dreq = (struct dasd_diag_req *) cqr->data; |
545 | dreq->block_count = count; | |
546 | dbio = dreq->bio; | |
547 | recid = first_rec; | |
5705f702 | 548 | rq_for_each_segment(bv, req, iter) { |
7988613b KO |
549 | dst = page_address(bv.bv_page) + bv.bv_offset; |
550 | for (off = 0; off < bv.bv_len; off += blksize) { | |
6c92e699 JA |
551 | memset(dbio, 0, sizeof (struct dasd_diag_bio)); |
552 | dbio->type = rw_cmd; | |
553 | dbio->block_number = recid + 1; | |
554 | dbio->buffer = dst; | |
555 | dbio++; | |
556 | dst += blksize; | |
557 | recid++; | |
558 | } | |
1da177e4 | 559 | } |
1f1ee9ad | 560 | cqr->retries = memdev->default_retries; |
1aae0560 | 561 | cqr->buildclk = get_tod_clock(); |
13de227b HS |
562 | if (blk_noretry_request(req) || |
563 | block->base->features & DASD_FEATURE_FAILFAST) | |
1c01b8a5 | 564 | set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags); |
8e09f215 SW |
565 | cqr->startdev = memdev; |
566 | cqr->memdev = memdev; | |
567 | cqr->block = block; | |
7c8faa86 | 568 | cqr->expires = memdev->default_expires * HZ; |
1da177e4 LT |
569 | cqr->status = DASD_CQR_FILLED; |
570 | return cqr; | |
571 | } | |
572 | ||
fd49f41a HH |
573 | /* Release DASD request. Return non-zero if request was successful, zero |
574 | * otherwise. */ | |
1da177e4 LT |
575 | static int |
576 | dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req) | |
577 | { | |
578 | int status; | |
579 | ||
580 | status = cqr->status == DASD_CQR_DONE; | |
8e09f215 | 581 | dasd_sfree_request(cqr, cqr->memdev); |
1da177e4 LT |
582 | return status; |
583 | } | |
584 | ||
8e09f215 SW |
585 | static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr) |
586 | { | |
a2ace466 HR |
587 | if (cqr->retries < 0) |
588 | cqr->status = DASD_CQR_FAILED; | |
589 | else | |
590 | cqr->status = DASD_CQR_FILLED; | |
8e09f215 SW |
591 | }; |
592 | ||
fd49f41a | 593 | /* Fill in IOCTL data for device. */ |
1da177e4 LT |
594 | static int |
595 | dasd_diag_fill_info(struct dasd_device * device, | |
596 | struct dasd_information2_t * info) | |
597 | { | |
543691a4 | 598 | struct dasd_diag_private *private = device->private; |
1da177e4 | 599 | |
fd49f41a | 600 | info->label_block = (unsigned int) private->pt_block; |
1da177e4 LT |
601 | info->FBA_layout = 1; |
602 | info->format = DASD_FORMAT_LDL; | |
543691a4 SO |
603 | info->characteristics_size = sizeof(private->rdc_data); |
604 | memcpy(info->characteristics, &private->rdc_data, | |
605 | sizeof(private->rdc_data)); | |
1da177e4 LT |
606 | info->confdata_size = 0; |
607 | return 0; | |
608 | } | |
609 | ||
610 | static void | |
611 | dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req, | |
612 | struct irb *stat) | |
613 | { | |
fc19f381 | 614 | DBF_DEV_EVENT(DBF_WARNING, device, "%s", |
1da177e4 LT |
615 | "dump sense not available for DIAG data"); |
616 | } | |
617 | ||
2b67fc46 | 618 | static struct dasd_discipline dasd_diag_discipline = { |
1da177e4 LT |
619 | .owner = THIS_MODULE, |
620 | .name = "DIAG", | |
621 | .ebcname = "DIAG", | |
fd49f41a | 622 | .max_blocks = DIAG_MAX_BLOCKS, |
1da177e4 | 623 | .check_device = dasd_diag_check_device, |
a4d26c6a | 624 | .verify_path = dasd_generic_verify_path, |
1da177e4 LT |
625 | .fill_geometry = dasd_diag_fill_geometry, |
626 | .start_IO = dasd_start_diag, | |
fd49f41a | 627 | .term_IO = dasd_diag_term_IO, |
8e09f215 | 628 | .handle_terminated_request = dasd_diag_handle_terminated_request, |
1da177e4 LT |
629 | .erp_action = dasd_diag_erp_action, |
630 | .erp_postaction = dasd_diag_erp_postaction, | |
631 | .build_cp = dasd_diag_build_cp, | |
632 | .free_cp = dasd_diag_free_cp, | |
633 | .dump_sense = dasd_diag_dump_sense, | |
634 | .fill_info = dasd_diag_fill_info, | |
635 | }; | |
636 | ||
637 | static int __init | |
638 | dasd_diag_init(void) | |
639 | { | |
640 | if (!MACHINE_IS_VM) { | |
fc19f381 SH |
641 | pr_info("Discipline %s cannot be used without z/VM\n", |
642 | dasd_diag_discipline.name); | |
fd49f41a | 643 | return -ENODEV; |
1da177e4 LT |
644 | } |
645 | ASCEBC(dasd_diag_discipline.ebcname, 4); | |
646 | ||
82003c3e | 647 | irq_subclass_register(IRQ_SUBCLASS_SERVICE_SIGNAL); |
1dad093b | 648 | register_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler); |
1da177e4 LT |
649 | dasd_diag_discipline_pointer = &dasd_diag_discipline; |
650 | return 0; | |
651 | } | |
652 | ||
653 | static void __exit | |
654 | dasd_diag_cleanup(void) | |
655 | { | |
1dad093b | 656 | unregister_external_irq(EXT_IRQ_CP_SERVICE, dasd_ext_handler); |
82003c3e | 657 | irq_subclass_unregister(IRQ_SUBCLASS_SERVICE_SIGNAL); |
1da177e4 LT |
658 | dasd_diag_discipline_pointer = NULL; |
659 | } | |
660 | ||
661 | module_init(dasd_diag_init); | |
662 | module_exit(dasd_diag_cleanup); |