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
11 #define KMSG_COMPONENT "dasd-diag"
13 #include <linux/stddef.h>
14 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/hdreg.h>
17 #include <linux/bio.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/jiffies.h>
23 #include <asm/debug.h>
24 #include <asm/ebcdic.h>
26 #include <asm/s390_ext.h>
31 #include "dasd_diag.h"
33 #define PRINTK_HEADER "dasd(diag):"
35 MODULE_LICENSE("GPL");
37 /* The maximum number of blocks per request (max_blocks) is dependent on the
38 * amount of storage that is available in the static I/O buffer for each
39 * device. Currently each device gets 2 pages. We want to fit two requests
40 * into the available memory so that we can immediately start the next if one
42 #define DIAG_MAX_BLOCKS (((2 * PAGE_SIZE - sizeof(struct dasd_ccw_req) - \
43 sizeof(struct dasd_diag_req)) / \
44 sizeof(struct dasd_diag_bio)) / 2)
45 #define DIAG_MAX_RETRIES 32
46 #define DIAG_TIMEOUT 50 * HZ
48 static struct dasd_discipline dasd_diag_discipline;
50 struct dasd_diag_private {
51 struct dasd_diag_characteristics rdc_data;
52 struct dasd_diag_rw_io iob;
53 struct dasd_diag_init_io iib;
55 struct ccw_dev_id dev_id;
58 struct dasd_diag_req {
59 unsigned int block_count;
60 struct dasd_diag_bio bio[0];
63 static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
65 /* Perform DIAG250 call with block I/O parameter list iob (input and output)
66 * and function code cmd.
67 * In case of an exception return 3. Otherwise return result of bitwise OR of
68 * resulting condition code and DIAG return code. */
69 static inline int dia250(void *iob, int cmd)
71 register unsigned long reg2 asm ("2") = (unsigned long) iob;
73 struct dasd_diag_init_io init_io;
74 struct dasd_diag_rw_io rw_io;
86 : "+d" (rc), "=m" (*(addr_type *) iob)
87 : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob)
92 /* Initialize block I/O to DIAG device using the specified blocksize and
93 * block offset. On success, return zero and set end_block to contain the
94 * number of blocks on the device minus the specified offset. Return non-zero
97 mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
98 blocknum_t offset, blocknum_t *end_block)
100 struct dasd_diag_private *private;
101 struct dasd_diag_init_io *iib;
104 private = (struct dasd_diag_private *) device->private;
106 memset(iib, 0, sizeof (struct dasd_diag_init_io));
108 iib->dev_nr = private->dev_id.devno;
109 iib->block_size = blocksize;
110 iib->offset = offset;
111 iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
113 rc = dia250(iib, INIT_BIO);
115 if ((rc & 3) == 0 && end_block)
116 *end_block = iib->end_block;
121 /* Remove block I/O environment for device. Return zero on success, non-zero
124 mdsk_term_io(struct dasd_device * device)
126 struct dasd_diag_private *private;
127 struct dasd_diag_init_io *iib;
130 private = (struct dasd_diag_private *) device->private;
132 memset(iib, 0, sizeof (struct dasd_diag_init_io));
133 iib->dev_nr = private->dev_id.devno;
134 rc = dia250(iib, TERM_BIO);
138 /* Error recovery for failed DIAG requests - try to reestablish the DIAG
141 dasd_diag_erp(struct dasd_device *device)
145 mdsk_term_io(device);
146 rc = mdsk_init_io(device, device->block->bp_block, 0, NULL);
148 if (!(device->features & DASD_FEATURE_READONLY)) {
149 dev_warn(&device->cdev->dev,
150 "The access mode of a DIAG device changed"
152 device->features |= DASD_FEATURE_READONLY;
157 dev_warn(&device->cdev->dev, "DIAG ERP failed with "
161 /* Start a given request at the device. Return zero on success, non-zero
164 dasd_start_diag(struct dasd_ccw_req * cqr)
166 struct dasd_device *device;
167 struct dasd_diag_private *private;
168 struct dasd_diag_req *dreq;
171 device = cqr->startdev;
172 if (cqr->retries < 0) {
173 DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p "
174 "- no retry left)", cqr);
175 cqr->status = DASD_CQR_ERROR;
178 private = (struct dasd_diag_private *) device->private;
179 dreq = (struct dasd_diag_req *) cqr->data;
181 private->iob.dev_nr = private->dev_id.devno;
182 private->iob.key = 0;
183 private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
184 private->iob.block_count = dreq->block_count;
185 private->iob.interrupt_params = (addr_t) cqr;
186 private->iob.bio_list = dreq->bio;
187 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
189 cqr->startclk = get_clock();
190 cqr->starttime = jiffies;
193 rc = dia250(&private->iob, RW_BIO);
195 case 0: /* Synchronous I/O finished successfully */
196 cqr->stopclk = get_clock();
197 cqr->status = DASD_CQR_SUCCESS;
198 /* Indicate to calling function that only a dasd_schedule_bh()
199 and no timer is needed */
202 case 8: /* Asynchronous I/O was started */
203 cqr->status = DASD_CQR_IN_IO;
206 default: /* Error condition */
207 cqr->status = DASD_CQR_QUEUED;
208 DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc);
209 dasd_diag_erp(device);
217 /* Terminate given request at the device. */
219 dasd_diag_term_IO(struct dasd_ccw_req * cqr)
221 struct dasd_device *device;
223 device = cqr->startdev;
224 mdsk_term_io(device);
225 mdsk_init_io(device, device->block->bp_block, 0, NULL);
226 cqr->status = DASD_CQR_CLEAR_PENDING;
227 cqr->stopclk = get_clock();
228 dasd_schedule_device_bh(device);
232 /* Handle external interruption. */
234 dasd_ext_handler(__u16 code)
236 struct dasd_ccw_req *cqr, *next;
237 struct dasd_device *device;
238 unsigned long long expires;
244 int_code = *((u8 *) DASD_DIAG_LC_INT_CODE);
245 status = *((u8 *) DASD_DIAG_LC_INT_STATUS);
247 case DASD_DIAG_CODE_31BIT:
248 ip = (addr_t) *((u32 *) DASD_DIAG_LC_INT_PARM_31BIT);
250 case DASD_DIAG_CODE_64BIT:
251 ip = (addr_t) *((u64 *) DASD_DIAG_LC_INT_PARM_64BIT);
256 if (!ip) { /* no intparm: unsolicited interrupt */
257 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited "
261 cqr = (struct dasd_ccw_req *) ip;
262 device = (struct dasd_device *) cqr->startdev;
263 if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
264 DBF_DEV_EVENT(DBF_WARNING, device,
265 " magic number of dasd_ccw_req 0x%08X doesn't"
266 " match discipline 0x%08X",
267 cqr->magic, *(int *) (&device->discipline->name));
271 /* get irq lock to modify request queue */
272 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
274 /* Check for a pending clear operation */
275 if (cqr->status == DASD_CQR_CLEAR_PENDING) {
276 cqr->status = DASD_CQR_CLEARED;
277 dasd_device_clear_timer(device);
278 dasd_schedule_device_bh(device);
279 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
283 cqr->stopclk = get_clock();
287 cqr->status = DASD_CQR_SUCCESS;
288 /* Start first request on queue if possible -> fast_io. */
289 if (!list_empty(&device->ccw_queue)) {
290 next = list_entry(device->ccw_queue.next,
291 struct dasd_ccw_req, devlist);
292 if (next->status == DASD_CQR_QUEUED) {
293 rc = dasd_start_diag(next);
295 expires = next->expires;
299 cqr->status = DASD_CQR_QUEUED;
300 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for "
301 "request %p was %d (%d retries left)", cqr, status,
303 dasd_diag_erp(device);
307 dasd_device_set_timer(device, expires);
309 dasd_device_clear_timer(device);
310 dasd_schedule_device_bh(device);
312 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
315 /* Check whether device can be controlled by DIAG discipline. Return zero on
316 * success, non-zero otherwise. */
318 dasd_diag_check_device(struct dasd_device *device)
320 struct dasd_block *block;
321 struct dasd_diag_private *private;
322 struct dasd_diag_characteristics *rdc_data;
323 struct dasd_diag_bio bio;
324 struct vtoc_cms_label *label;
325 blocknum_t end_block;
326 unsigned int sb, bsize;
329 private = (struct dasd_diag_private *) device->private;
330 if (private == NULL) {
331 private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL);
332 if (private == NULL) {
333 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
334 "Allocating memory for private DASD data "
338 ccw_device_get_id(device->cdev, &private->dev_id);
339 device->private = (void *) private;
341 block = dasd_alloc_block();
343 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
344 "could not allocate dasd block structure");
345 device->private = NULL;
347 return PTR_ERR(block);
349 device->block = block;
350 block->base = device;
352 /* Read Device Characteristics */
353 rdc_data = (void *) &(private->rdc_data);
354 rdc_data->dev_nr = private->dev_id.devno;
355 rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
357 rc = diag210((struct diag210 *) rdc_data);
359 DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device "
360 "information (rc=%d)", rc);
365 /* Figure out position of label block */
366 switch (private->rdc_data.vdev_class) {
368 private->pt_block = 1;
371 private->pt_block = 2;
374 dev_warn(&device->cdev->dev, "Device type %d is not supported "
375 "in DIAG mode\n", private->rdc_data.vdev_class);
380 DBF_DEV_EVENT(DBF_INFO, device,
381 "%04X: %04X on real %04X/%02X",
384 rdc_data->rdev_type, rdc_data->rdev_model);
386 /* terminate all outstanding operations */
387 mdsk_term_io(device);
389 /* figure out blocksize of device */
390 label = (struct vtoc_cms_label *) get_zeroed_page(GFP_KERNEL);
392 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
393 "No memory to allocate initialization request");
399 /* try all sizes - needed for ECKD devices */
400 for (bsize = 512; bsize <= PAGE_SIZE; bsize <<= 1) {
401 mdsk_init_io(device, bsize, 0, &end_block);
402 memset(&bio, 0, sizeof (struct dasd_diag_bio));
403 bio.type = MDSK_READ_REQ;
404 bio.block_number = private->pt_block + 1;
406 memset(&private->iob, 0, sizeof (struct dasd_diag_rw_io));
407 private->iob.dev_nr = rdc_data->dev_nr;
408 private->iob.key = 0;
409 private->iob.flags = 0; /* do synchronous io */
410 private->iob.block_count = 1;
411 private->iob.interrupt_params = 0;
412 private->iob.bio_list = &bio;
413 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
414 rc = dia250(&private->iob, RW_BIO);
416 dev_warn(&device->cdev->dev,
417 "A 64-bit DIAG call failed\n");
421 mdsk_term_io(device);
425 if (bsize > PAGE_SIZE) {
426 dev_warn(&device->cdev->dev, "Accessing the DASD failed because"
427 " of an incorrect format (rc=%d)\n", rc);
431 /* check for label block */
432 if (memcmp(label->label_id, DASD_DIAG_CMS1,
433 sizeof(DASD_DIAG_CMS1)) == 0) {
434 /* get formatted blocksize from label block */
435 bsize = (unsigned int) label->block_size;
436 block->blocks = (unsigned long) label->block_count;
438 block->blocks = end_block;
439 block->bp_block = bsize;
440 block->s2b_shift = 0; /* bits to shift 512 to get a block */
441 for (sb = 512; sb < bsize; sb = sb << 1)
443 rc = mdsk_init_io(device, block->bp_block, 0, NULL);
444 if (rc && (rc != 4)) {
445 dev_warn(&device->cdev->dev, "DIAG initialization "
446 "failed with rc=%d\n", rc);
450 device->features |= DASD_FEATURE_READONLY;
451 dev_info(&device->cdev->dev,
452 "New DASD with %ld byte/block, total size %ld KB%s\n",
453 (unsigned long) block->bp_block,
454 (unsigned long) (block->blocks <<
455 block->s2b_shift) >> 1,
456 (rc == 4) ? ", read-only device" : "");
460 free_page((long) label);
463 device->block = NULL;
464 dasd_free_block(block);
465 device->private = NULL;
471 /* Fill in virtual disk geometry for device. Return zero on success, non-zero
474 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
476 if (dasd_check_blocksize(block->bp_block) != 0)
478 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
480 geo->sectors = 128 >> block->s2b_shift;
485 dasd_diag_erp_action(struct dasd_ccw_req * cqr)
487 return dasd_default_erp_action;
491 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
493 return dasd_default_erp_postaction;
496 /* Create DASD request from block device request. Return pointer to new
497 * request on success, ERR_PTR otherwise. */
498 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
499 struct dasd_block *block,
502 struct dasd_ccw_req *cqr;
503 struct dasd_diag_req *dreq;
504 struct dasd_diag_bio *dbio;
505 struct req_iterator iter;
508 unsigned int count, datasize;
509 sector_t recid, first_rec, last_rec;
510 unsigned int blksize, off;
511 unsigned char rw_cmd;
513 if (rq_data_dir(req) == READ)
514 rw_cmd = MDSK_READ_REQ;
515 else if (rq_data_dir(req) == WRITE)
516 rw_cmd = MDSK_WRITE_REQ;
518 return ERR_PTR(-EINVAL);
519 blksize = block->bp_block;
520 /* Calculate record id of first and last block. */
521 first_rec = blk_rq_pos(req) >> block->s2b_shift;
523 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
524 /* Check struct bio and count the number of blocks for the request. */
526 rq_for_each_segment(bv, req, iter) {
527 if (bv->bv_len & (blksize - 1))
528 /* Fba can only do full blocks. */
529 return ERR_PTR(-EINVAL);
530 count += bv->bv_len >> (block->s2b_shift + 9);
533 if (count != last_rec - first_rec + 1)
534 return ERR_PTR(-EINVAL);
535 /* Build the request */
536 datasize = sizeof(struct dasd_diag_req) +
537 count*sizeof(struct dasd_diag_bio);
538 cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev);
542 dreq = (struct dasd_diag_req *) cqr->data;
543 dreq->block_count = count;
546 rq_for_each_segment(bv, req, iter) {
547 dst = page_address(bv->bv_page) + bv->bv_offset;
548 for (off = 0; off < bv->bv_len; off += blksize) {
549 memset(dbio, 0, sizeof (struct dasd_diag_bio));
551 dbio->block_number = recid + 1;
558 cqr->retries = DIAG_MAX_RETRIES;
559 cqr->buildclk = get_clock();
560 if (blk_noretry_request(req) ||
561 block->base->features & DASD_FEATURE_FAILFAST)
562 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
563 cqr->startdev = memdev;
564 cqr->memdev = memdev;
566 cqr->expires = DIAG_TIMEOUT;
567 cqr->status = DASD_CQR_FILLED;
571 /* Release DASD request. Return non-zero if request was successful, zero
574 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
578 status = cqr->status == DASD_CQR_DONE;
579 dasd_sfree_request(cqr, cqr->memdev);
583 static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr)
585 cqr->status = DASD_CQR_FILLED;
588 /* Fill in IOCTL data for device. */
590 dasd_diag_fill_info(struct dasd_device * device,
591 struct dasd_information2_t * info)
593 struct dasd_diag_private *private;
595 private = (struct dasd_diag_private *) device->private;
596 info->label_block = (unsigned int) private->pt_block;
597 info->FBA_layout = 1;
598 info->format = DASD_FORMAT_LDL;
599 info->characteristics_size = sizeof (struct dasd_diag_characteristics);
600 memcpy(info->characteristics,
601 &((struct dasd_diag_private *) device->private)->rdc_data,
602 sizeof (struct dasd_diag_characteristics));
603 info->confdata_size = 0;
608 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
611 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
612 "dump sense not available for DIAG data");
615 static struct dasd_discipline dasd_diag_discipline = {
616 .owner = THIS_MODULE,
619 .max_blocks = DIAG_MAX_BLOCKS,
620 .check_device = dasd_diag_check_device,
621 .fill_geometry = dasd_diag_fill_geometry,
622 .start_IO = dasd_start_diag,
623 .term_IO = dasd_diag_term_IO,
624 .handle_terminated_request = dasd_diag_handle_terminated_request,
625 .erp_action = dasd_diag_erp_action,
626 .erp_postaction = dasd_diag_erp_postaction,
627 .build_cp = dasd_diag_build_cp,
628 .free_cp = dasd_diag_free_cp,
629 .dump_sense = dasd_diag_dump_sense,
630 .fill_info = dasd_diag_fill_info,
636 if (!MACHINE_IS_VM) {
637 pr_info("Discipline %s cannot be used without z/VM\n",
638 dasd_diag_discipline.name);
641 ASCEBC(dasd_diag_discipline.ebcname, 4);
644 register_external_interrupt(0x2603, dasd_ext_handler);
645 dasd_diag_discipline_pointer = &dasd_diag_discipline;
650 dasd_diag_cleanup(void)
652 unregister_external_interrupt(0x2603, dasd_ext_handler);
654 dasd_diag_discipline_pointer = NULL;
657 module_init(dasd_diag_init);
658 module_exit(dasd_diag_cleanup);