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"
13 #include <linux/kernel_stat.h>
14 #include <linux/stddef.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/hdreg.h>
18 #include <linux/bio.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/jiffies.h>
24 #include <asm/debug.h>
25 #include <asm/ebcdic.h>
27 #include <asm/s390_ext.h>
32 #include "dasd_diag.h"
34 #define PRINTK_HEADER "dasd(diag):"
36 MODULE_LICENSE("GPL");
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
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
49 static struct dasd_discipline dasd_diag_discipline;
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;
56 struct ccw_dev_id dev_id;
59 struct dasd_diag_req {
60 unsigned int block_count;
61 struct dasd_diag_bio bio[0];
64 static const u8 DASD_DIAG_CMS1[] = { 0xc3, 0xd4, 0xe2, 0xf1 };/* EBCDIC CMS1 */
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. */
70 static inline int dia250(void *iob, int cmd)
72 register unsigned long reg2 asm ("2") = (unsigned long) iob;
74 struct dasd_diag_init_io init_io;
75 struct dasd_diag_rw_io rw_io;
87 : "+d" (rc), "=m" (*(addr_type *) iob)
88 : "d" (cmd), "d" (reg2), "m" (*(addr_type *) iob)
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
98 mdsk_init_io(struct dasd_device *device, unsigned int blocksize,
99 blocknum_t offset, blocknum_t *end_block)
101 struct dasd_diag_private *private;
102 struct dasd_diag_init_io *iib;
105 private = (struct dasd_diag_private *) device->private;
107 memset(iib, 0, sizeof (struct dasd_diag_init_io));
109 iib->dev_nr = private->dev_id.devno;
110 iib->block_size = blocksize;
111 iib->offset = offset;
112 iib->flaga = DASD_DIAG_FLAGA_DEFAULT;
114 rc = dia250(iib, INIT_BIO);
116 if ((rc & 3) == 0 && end_block)
117 *end_block = iib->end_block;
122 /* Remove block I/O environment for device. Return zero on success, non-zero
125 mdsk_term_io(struct dasd_device * device)
127 struct dasd_diag_private *private;
128 struct dasd_diag_init_io *iib;
131 private = (struct dasd_diag_private *) device->private;
133 memset(iib, 0, sizeof (struct dasd_diag_init_io));
134 iib->dev_nr = private->dev_id.devno;
135 rc = dia250(iib, TERM_BIO);
139 /* Error recovery for failed DIAG requests - try to reestablish the DIAG
142 dasd_diag_erp(struct dasd_device *device)
146 mdsk_term_io(device);
147 rc = mdsk_init_io(device, device->block->bp_block, 0, NULL);
149 if (!(test_and_set_bit(DASD_FLAG_DEVICE_RO, &device->flags)))
150 pr_warning("%s: The access mode of a DIAG device "
151 "changed to read-only\n",
152 dev_name(&device->cdev->dev));
156 pr_warning("%s: DIAG ERP failed with "
157 "rc=%d\n", dev_name(&device->cdev->dev), rc);
160 /* Start a given request at the device. Return zero on success, non-zero
163 dasd_start_diag(struct dasd_ccw_req * cqr)
165 struct dasd_device *device;
166 struct dasd_diag_private *private;
167 struct dasd_diag_req *dreq;
170 device = cqr->startdev;
171 if (cqr->retries < 0) {
172 DBF_DEV_EVENT(DBF_ERR, device, "DIAG start_IO: request %p "
173 "- no retry left)", cqr);
174 cqr->status = DASD_CQR_ERROR;
177 private = (struct dasd_diag_private *) device->private;
178 dreq = (struct dasd_diag_req *) cqr->data;
180 private->iob.dev_nr = private->dev_id.devno;
181 private->iob.key = 0;
182 private->iob.flags = DASD_DIAG_RWFLAG_ASYNC;
183 private->iob.block_count = dreq->block_count;
184 private->iob.interrupt_params = (addr_t) cqr;
185 private->iob.bio_list = dreq->bio;
186 private->iob.flaga = DASD_DIAG_FLAGA_DEFAULT;
188 cqr->startclk = get_clock();
189 cqr->starttime = jiffies;
192 rc = dia250(&private->iob, RW_BIO);
194 case 0: /* Synchronous I/O finished successfully */
195 cqr->stopclk = get_clock();
196 cqr->status = DASD_CQR_SUCCESS;
197 /* Indicate to calling function that only a dasd_schedule_bh()
198 and no timer is needed */
201 case 8: /* Asynchronous I/O was started */
202 cqr->status = DASD_CQR_IN_IO;
205 default: /* Error condition */
206 cqr->status = DASD_CQR_QUEUED;
207 DBF_DEV_EVENT(DBF_WARNING, device, "dia250 returned rc=%d", rc);
208 dasd_diag_erp(device);
216 /* Terminate given request at the device. */
218 dasd_diag_term_IO(struct dasd_ccw_req * cqr)
220 struct dasd_device *device;
222 device = cqr->startdev;
223 mdsk_term_io(device);
224 mdsk_init_io(device, device->block->bp_block, 0, NULL);
225 cqr->status = DASD_CQR_CLEAR_PENDING;
226 cqr->stopclk = get_clock();
227 dasd_schedule_device_bh(device);
231 /* Handle external interruption. */
232 static void dasd_ext_handler(unsigned int ext_int_code,
233 unsigned int param32, unsigned long param64)
235 struct dasd_ccw_req *cqr, *next;
236 struct dasd_device *device;
237 unsigned long long expires;
242 switch (ext_int_code >> 24) {
243 case DASD_DIAG_CODE_31BIT:
244 ip = (addr_t) param32;
246 case DASD_DIAG_CODE_64BIT:
247 ip = (addr_t) param64;
252 kstat_cpu(smp_processor_id()).irqs[EXTINT_DSD]++;
253 if (!ip) { /* no intparm: unsolicited interrupt */
254 DBF_EVENT(DBF_NOTICE, "%s", "caught unsolicited "
258 cqr = (struct dasd_ccw_req *) ip;
259 device = (struct dasd_device *) cqr->startdev;
260 if (strncmp(device->discipline->ebcname, (char *) &cqr->magic, 4)) {
261 DBF_DEV_EVENT(DBF_WARNING, device,
262 " magic number of dasd_ccw_req 0x%08X doesn't"
263 " match discipline 0x%08X",
264 cqr->magic, *(int *) (&device->discipline->name));
268 /* get irq lock to modify request queue */
269 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
271 /* Check for a pending clear operation */
272 if (cqr->status == DASD_CQR_CLEAR_PENDING) {
273 cqr->status = DASD_CQR_CLEARED;
274 dasd_device_clear_timer(device);
275 dasd_schedule_device_bh(device);
276 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
280 cqr->stopclk = get_clock();
283 if ((ext_int_code & 0xff0000) == 0) {
284 cqr->status = DASD_CQR_SUCCESS;
285 /* Start first request on queue if possible -> fast_io. */
286 if (!list_empty(&device->ccw_queue)) {
287 next = list_entry(device->ccw_queue.next,
288 struct dasd_ccw_req, devlist);
289 if (next->status == DASD_CQR_QUEUED) {
290 rc = dasd_start_diag(next);
292 expires = next->expires;
296 cqr->status = DASD_CQR_QUEUED;
297 DBF_DEV_EVENT(DBF_DEBUG, device, "interrupt status for "
298 "request %p was %d (%d retries left)", cqr,
299 (ext_int_code >> 16) & 0xff, cqr->retries);
300 dasd_diag_erp(device);
304 dasd_device_set_timer(device, expires);
306 dasd_device_clear_timer(device);
307 dasd_schedule_device_bh(device);
309 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
312 /* Check whether device can be controlled by DIAG discipline. Return zero on
313 * success, non-zero otherwise. */
315 dasd_diag_check_device(struct dasd_device *device)
317 struct dasd_block *block;
318 struct dasd_diag_private *private;
319 struct dasd_diag_characteristics *rdc_data;
320 struct dasd_diag_bio bio;
321 struct vtoc_cms_label *label;
322 blocknum_t end_block;
323 unsigned int sb, bsize;
326 private = (struct dasd_diag_private *) device->private;
327 if (private == NULL) {
328 private = kzalloc(sizeof(struct dasd_diag_private),GFP_KERNEL);
329 if (private == NULL) {
330 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
331 "Allocating memory for private DASD data "
335 ccw_device_get_id(device->cdev, &private->dev_id);
336 device->private = (void *) private;
338 block = dasd_alloc_block();
340 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
341 "could not allocate dasd block structure");
342 device->private = NULL;
344 return PTR_ERR(block);
346 device->block = block;
347 block->base = device;
349 /* Read Device Characteristics */
350 rdc_data = (void *) &(private->rdc_data);
351 rdc_data->dev_nr = private->dev_id.devno;
352 rdc_data->rdc_len = sizeof (struct dasd_diag_characteristics);
354 rc = diag210((struct diag210 *) rdc_data);
356 DBF_DEV_EVENT(DBF_WARNING, device, "failed to retrieve device "
357 "information (rc=%d)", rc);
362 device->default_expires = DIAG_TIMEOUT;
364 /* Figure out position of label block */
365 switch (private->rdc_data.vdev_class) {
367 private->pt_block = 1;
370 private->pt_block = 2;
373 pr_warning("%s: Device type %d is not supported "
374 "in DIAG mode\n", dev_name(&device->cdev->dev),
375 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 pr_warning("%s: A 64-bit DIAG call failed\n",
417 dev_name(&device->cdev->dev));
421 mdsk_term_io(device);
425 if (bsize > PAGE_SIZE) {
426 pr_warning("%s: Accessing the DASD failed because of an "
427 "incorrect format (rc=%d)\n",
428 dev_name(&device->cdev->dev), rc);
432 /* check for label block */
433 if (memcmp(label->label_id, DASD_DIAG_CMS1,
434 sizeof(DASD_DIAG_CMS1)) == 0) {
435 /* get formatted blocksize from label block */
436 bsize = (unsigned int) label->block_size;
437 block->blocks = (unsigned long) label->block_count;
439 block->blocks = end_block;
440 block->bp_block = bsize;
441 block->s2b_shift = 0; /* bits to shift 512 to get a block */
442 for (sb = 512; sb < bsize; sb = sb << 1)
444 rc = mdsk_init_io(device, block->bp_block, 0, NULL);
445 if (rc && (rc != 4)) {
446 pr_warning("%s: DIAG initialization failed with rc=%d\n",
447 dev_name(&device->cdev->dev), rc);
451 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
452 pr_info("%s: New DASD with %ld byte/block, total size %ld "
453 "KB%s\n", dev_name(&device->cdev->dev),
454 (unsigned long) block->bp_block,
455 (unsigned long) (block->blocks <<
456 block->s2b_shift) >> 1,
457 (rc == 4) ? ", read-only device" : "");
461 free_page((long) label);
464 device->block = NULL;
465 dasd_free_block(block);
466 device->private = NULL;
472 /* Fill in virtual disk geometry for device. Return zero on success, non-zero
475 dasd_diag_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
477 if (dasd_check_blocksize(block->bp_block) != 0)
479 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
481 geo->sectors = 128 >> block->s2b_shift;
486 dasd_diag_erp_action(struct dasd_ccw_req * cqr)
488 return dasd_default_erp_action;
492 dasd_diag_erp_postaction(struct dasd_ccw_req * cqr)
494 return dasd_default_erp_postaction;
497 /* Create DASD request from block device request. Return pointer to new
498 * request on success, ERR_PTR otherwise. */
499 static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
500 struct dasd_block *block,
503 struct dasd_ccw_req *cqr;
504 struct dasd_diag_req *dreq;
505 struct dasd_diag_bio *dbio;
506 struct req_iterator iter;
509 unsigned int count, datasize;
510 sector_t recid, first_rec, last_rec;
511 unsigned int blksize, off;
512 unsigned char rw_cmd;
514 if (rq_data_dir(req) == READ)
515 rw_cmd = MDSK_READ_REQ;
516 else if (rq_data_dir(req) == WRITE)
517 rw_cmd = MDSK_WRITE_REQ;
519 return ERR_PTR(-EINVAL);
520 blksize = block->bp_block;
521 /* Calculate record id of first and last block. */
522 first_rec = blk_rq_pos(req) >> block->s2b_shift;
524 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
525 /* Check struct bio and count the number of blocks for the request. */
527 rq_for_each_segment(bv, req, iter) {
528 if (bv->bv_len & (blksize - 1))
529 /* Fba can only do full blocks. */
530 return ERR_PTR(-EINVAL);
531 count += bv->bv_len >> (block->s2b_shift + 9);
534 if (count != last_rec - first_rec + 1)
535 return ERR_PTR(-EINVAL);
536 /* Build the request */
537 datasize = sizeof(struct dasd_diag_req) +
538 count*sizeof(struct dasd_diag_bio);
539 cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev);
543 dreq = (struct dasd_diag_req *) cqr->data;
544 dreq->block_count = count;
547 rq_for_each_segment(bv, req, iter) {
548 dst = page_address(bv->bv_page) + bv->bv_offset;
549 for (off = 0; off < bv->bv_len; off += blksize) {
550 memset(dbio, 0, sizeof (struct dasd_diag_bio));
552 dbio->block_number = recid + 1;
559 cqr->retries = DIAG_MAX_RETRIES;
560 cqr->buildclk = get_clock();
561 if (blk_noretry_request(req) ||
562 block->base->features & DASD_FEATURE_FAILFAST)
563 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
564 cqr->startdev = memdev;
565 cqr->memdev = memdev;
567 cqr->expires = memdev->default_expires * HZ;
568 cqr->status = DASD_CQR_FILLED;
572 /* Release DASD request. Return non-zero if request was successful, zero
575 dasd_diag_free_cp(struct dasd_ccw_req *cqr, struct request *req)
579 status = cqr->status == DASD_CQR_DONE;
580 dasd_sfree_request(cqr, cqr->memdev);
584 static void dasd_diag_handle_terminated_request(struct dasd_ccw_req *cqr)
586 cqr->status = DASD_CQR_FILLED;
589 /* Fill in IOCTL data for device. */
591 dasd_diag_fill_info(struct dasd_device * device,
592 struct dasd_information2_t * info)
594 struct dasd_diag_private *private;
596 private = (struct dasd_diag_private *) device->private;
597 info->label_block = (unsigned int) private->pt_block;
598 info->FBA_layout = 1;
599 info->format = DASD_FORMAT_LDL;
600 info->characteristics_size = sizeof (struct dasd_diag_characteristics);
601 memcpy(info->characteristics,
602 &((struct dasd_diag_private *) device->private)->rdc_data,
603 sizeof (struct dasd_diag_characteristics));
604 info->confdata_size = 0;
609 dasd_diag_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
612 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
613 "dump sense not available for DIAG data");
616 static struct dasd_discipline dasd_diag_discipline = {
617 .owner = THIS_MODULE,
620 .max_blocks = DIAG_MAX_BLOCKS,
621 .check_device = dasd_diag_check_device,
622 .verify_path = dasd_generic_verify_path,
623 .fill_geometry = dasd_diag_fill_geometry,
624 .start_IO = dasd_start_diag,
625 .term_IO = dasd_diag_term_IO,
626 .handle_terminated_request = dasd_diag_handle_terminated_request,
627 .erp_action = dasd_diag_erp_action,
628 .erp_postaction = dasd_diag_erp_postaction,
629 .build_cp = dasd_diag_build_cp,
630 .free_cp = dasd_diag_free_cp,
631 .dump_sense = dasd_diag_dump_sense,
632 .fill_info = dasd_diag_fill_info,
638 if (!MACHINE_IS_VM) {
639 pr_info("Discipline %s cannot be used without z/VM\n",
640 dasd_diag_discipline.name);
643 ASCEBC(dasd_diag_discipline.ebcname, 4);
646 register_external_interrupt(0x2603, dasd_ext_handler);
647 dasd_diag_discipline_pointer = &dasd_diag_discipline;
652 dasd_diag_cleanup(void)
654 unregister_external_interrupt(0x2603, dasd_ext_handler);
656 dasd_diag_discipline_pointer = NULL;
659 module_init(dasd_diag_init);
660 module_exit(dasd_diag_cleanup);