2 * File...........: linux/drivers/s390/block/dasd_fba.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Bugreports.to..: <Linux390@de.ibm.com>
5 * Copyright IBM Corp. 1999, 2009
8 #define KMSG_COMPONENT "dasd-fba"
10 #include <linux/stddef.h>
11 #include <linux/kernel.h>
12 #include <asm/debug.h>
14 #include <linux/slab.h>
15 #include <linux/hdreg.h> /* HDIO_GETGEO */
16 #include <linux/bio.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
20 #include <asm/idals.h>
21 #include <asm/ebcdic.h>
23 #include <asm/ccwdev.h>
30 #endif /* PRINTK_HEADER */
31 #define PRINTK_HEADER "dasd(fba):"
33 #define DASD_FBA_CCW_WRITE 0x41
34 #define DASD_FBA_CCW_READ 0x42
35 #define DASD_FBA_CCW_LOCATE 0x43
36 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
38 MODULE_LICENSE("GPL");
40 static struct dasd_discipline dasd_fba_discipline;
42 struct dasd_fba_private {
43 struct dasd_fba_characteristics rdc_data;
46 static struct ccw_device_id dasd_fba_ids[] = {
47 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
48 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
49 { /* end of list */ },
52 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
54 static struct ccw_driver dasd_fba_driver; /* see below */
56 dasd_fba_probe(struct ccw_device *cdev)
58 return dasd_generic_probe(cdev, &dasd_fba_discipline);
62 dasd_fba_set_online(struct ccw_device *cdev)
64 return dasd_generic_set_online(cdev, &dasd_fba_discipline);
67 static struct ccw_driver dasd_fba_driver = {
71 .probe = dasd_fba_probe,
72 .remove = dasd_generic_remove,
73 .set_offline = dasd_generic_set_offline,
74 .set_online = dasd_fba_set_online,
75 .notify = dasd_generic_notify,
76 .freeze = dasd_generic_pm_freeze,
77 .thaw = dasd_generic_restore_device,
78 .restore = dasd_generic_restore_device,
82 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
83 int blksize, int beg, int nr)
85 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
88 ccw->cda = (__u32) __pa(data);
89 memset(data, 0, sizeof (struct DE_fba_data));
91 (data->mask).perm = 0x0;
93 (data->mask).perm = 0x1;
95 data->mask.perm = 0x2;
96 data->blk_size = blksize;
98 data->ext_end = nr - 1;
102 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
103 int block_nr, int block_ct)
105 ccw->cmd_code = DASD_FBA_CCW_LOCATE;
108 ccw->cda = (__u32) __pa(data);
109 memset(data, 0, sizeof (struct LO_fba_data));
111 data->operation.cmd = 0x5;
113 data->operation.cmd = 0x6;
115 data->operation.cmd = 0x8;
116 data->blk_nr = block_nr;
117 data->blk_ct = block_ct;
121 dasd_fba_check_characteristics(struct dasd_device *device)
123 struct dasd_block *block;
124 struct dasd_fba_private *private;
125 struct ccw_device *cdev = device->cdev;
128 private = (struct dasd_fba_private *) device->private;
130 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
132 dev_warn(&device->cdev->dev,
133 "Allocating memory for private DASD "
137 device->private = (void *) private;
139 memset(private, 0, sizeof(*private));
141 block = dasd_alloc_block();
143 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s", "could not allocate "
144 "dasd block structure");
145 device->private = NULL;
147 return PTR_ERR(block);
149 device->block = block;
150 block->base = device;
152 /* Read Device Characteristics */
153 rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
154 &private->rdc_data, 32);
156 DBF_EVENT_DEVID(DBF_WARNING, cdev, "Read device "
157 "characteristics returned error %d", rc);
158 device->block = NULL;
159 dasd_free_block(block);
160 device->private = NULL;
165 dev_info(&device->cdev->dev,
166 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
172 ((private->rdc_data.blk_bdsa *
173 (private->rdc_data.blk_size >> 9)) >> 11),
174 private->rdc_data.blk_size);
178 static int dasd_fba_do_analysis(struct dasd_block *block)
180 struct dasd_fba_private *private;
183 private = (struct dasd_fba_private *) block->base->private;
184 rc = dasd_check_blocksize(private->rdc_data.blk_size);
186 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
187 private->rdc_data.blk_size);
190 block->blocks = private->rdc_data.blk_bdsa;
191 block->bp_block = private->rdc_data.blk_size;
192 block->s2b_shift = 0; /* bits to shift 512 to get a block */
193 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
198 static int dasd_fba_fill_geometry(struct dasd_block *block,
199 struct hd_geometry *geo)
201 if (dasd_check_blocksize(block->bp_block) != 0)
203 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
205 geo->sectors = 128 >> block->s2b_shift;
210 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
212 return dasd_default_erp_action;
216 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
218 if (cqr->function == dasd_default_erp_action)
219 return dasd_default_erp_postaction;
221 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
226 static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device,
231 /* first of all check for state change pending interrupt */
232 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
233 if ((irb->scsw.cmd.dstat & mask) == mask) {
234 dasd_generic_handle_state_change(device);
238 /* check for unsolicited interrupts */
239 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
240 "unsolicited interrupt received");
241 device->discipline->dump_sense_dbf(device, irb, "unsolicited");
242 dasd_schedule_device_bh(device);
246 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
247 struct dasd_block *block,
250 struct dasd_fba_private *private;
251 unsigned long *idaws;
252 struct LO_fba_data *LO_data;
253 struct dasd_ccw_req *cqr;
255 struct req_iterator iter;
258 int count, cidaw, cplength, datasize;
259 sector_t recid, first_rec, last_rec;
260 unsigned int blksize, off;
263 private = (struct dasd_fba_private *) block->base->private;
264 if (rq_data_dir(req) == READ) {
265 cmd = DASD_FBA_CCW_READ;
266 } else if (rq_data_dir(req) == WRITE) {
267 cmd = DASD_FBA_CCW_WRITE;
269 return ERR_PTR(-EINVAL);
270 blksize = block->bp_block;
271 /* Calculate record id of first and last block. */
272 first_rec = blk_rq_pos(req) >> block->s2b_shift;
274 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
275 /* Check struct bio and count the number of blocks for the request. */
278 rq_for_each_segment(bv, req, iter) {
279 if (bv->bv_len & (blksize - 1))
280 /* Fba can only do full blocks. */
281 return ERR_PTR(-EINVAL);
282 count += bv->bv_len >> (block->s2b_shift + 9);
283 #if defined(CONFIG_64BIT)
284 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
285 cidaw += bv->bv_len / blksize;
289 if (count != last_rec - first_rec + 1)
290 return ERR_PTR(-EINVAL);
291 /* 1x define extent + 1x locate record + number of blocks */
292 cplength = 2 + count;
293 /* 1x define extent + 1x locate record */
294 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
295 cidaw * sizeof(unsigned long);
297 * Find out number of additional locate record ccws if the device
298 * can't do data chaining.
300 if (private->rdc_data.mode.bits.data_chain == 0) {
301 cplength += count - 1;
302 datasize += (count - 1)*sizeof(struct LO_fba_data);
304 /* Allocate the ccw request. */
305 cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
309 /* First ccw is define extent. */
310 define_extent(ccw++, cqr->data, rq_data_dir(req),
311 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
312 /* Build locate_record + read/write ccws. */
313 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
314 LO_data = (struct LO_fba_data *) (idaws + cidaw);
315 /* Locate record for all blocks for smart devices. */
316 if (private->rdc_data.mode.bits.data_chain != 0) {
317 ccw[-1].flags |= CCW_FLAG_CC;
318 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
321 rq_for_each_segment(bv, req, iter) {
322 dst = page_address(bv->bv_page) + bv->bv_offset;
323 if (dasd_page_cache) {
324 char *copy = kmem_cache_alloc(dasd_page_cache,
325 GFP_DMA | __GFP_NOWARN);
326 if (copy && rq_data_dir(req) == WRITE)
327 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
329 dst = copy + bv->bv_offset;
331 for (off = 0; off < bv->bv_len; off += blksize) {
332 /* Locate record for stupid devices. */
333 if (private->rdc_data.mode.bits.data_chain == 0) {
334 ccw[-1].flags |= CCW_FLAG_CC;
335 locate_record(ccw, LO_data++,
337 recid - first_rec, 1);
338 ccw->flags = CCW_FLAG_CC;
341 if (recid > first_rec)
342 ccw[-1].flags |= CCW_FLAG_DC;
344 ccw[-1].flags |= CCW_FLAG_CC;
347 ccw->count = block->bp_block;
348 if (idal_is_needed(dst, blksize)) {
349 ccw->cda = (__u32)(addr_t) idaws;
350 ccw->flags = CCW_FLAG_IDA;
351 idaws = idal_create_words(idaws, dst, blksize);
353 ccw->cda = (__u32)(addr_t) dst;
361 if (blk_noretry_request(req) ||
362 block->base->features & DASD_FEATURE_FAILFAST)
363 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
364 cqr->startdev = memdev;
365 cqr->memdev = memdev;
367 cqr->expires = 5 * 60 * HZ; /* 5 minutes */
369 cqr->buildclk = get_clock();
370 cqr->status = DASD_CQR_FILLED;
375 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
377 struct dasd_fba_private *private;
379 struct req_iterator iter;
382 unsigned int blksize, off;
385 if (!dasd_page_cache)
387 private = (struct dasd_fba_private *) cqr->block->base->private;
388 blksize = cqr->block->bp_block;
390 /* Skip over define extent & locate record. */
392 if (private->rdc_data.mode.bits.data_chain != 0)
394 rq_for_each_segment(bv, req, iter) {
395 dst = page_address(bv->bv_page) + bv->bv_offset;
396 for (off = 0; off < bv->bv_len; off += blksize) {
397 /* Skip locate record. */
398 if (private->rdc_data.mode.bits.data_chain == 0)
401 if (ccw->flags & CCW_FLAG_IDA)
402 cda = *((char **)((addr_t) ccw->cda));
404 cda = (char *)((addr_t) ccw->cda);
406 if (rq_data_dir(req) == READ)
407 memcpy(dst, cda, bv->bv_len);
408 kmem_cache_free(dasd_page_cache,
409 (void *)((addr_t)cda & PAGE_MASK));
417 status = cqr->status == DASD_CQR_DONE;
418 dasd_sfree_request(cqr, cqr->memdev);
422 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
424 cqr->status = DASD_CQR_FILLED;
428 dasd_fba_fill_info(struct dasd_device * device,
429 struct dasd_information2_t * info)
431 info->label_block = 1;
432 info->FBA_layout = 1;
433 info->format = DASD_FORMAT_LDL;
434 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
435 memcpy(info->characteristics,
436 &((struct dasd_fba_private *) device->private)->rdc_data,
437 sizeof (struct dasd_fba_characteristics));
438 info->confdata_size = 0;
443 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
448 sense = (u64 *) dasd_get_sense(irb);
450 DBF_DEV_EVENT(DBF_EMERG, device,
451 "%s: %s %02x%02x%02x %016llx %016llx %016llx "
453 scsw_is_tm(&irb->scsw) ? "t" : "c",
454 scsw_cc(&irb->scsw), scsw_cstat(&irb->scsw),
455 scsw_dstat(&irb->scsw), sense[0], sense[1],
458 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
459 "SORRY - NO VALID SENSE AVAILABLE\n");
465 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
469 struct ccw1 *act, *end, *last;
470 int len, sl, sct, count;
472 page = (char *) get_zeroed_page(GFP_ATOMIC);
474 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
475 "No memory to dump sense data");
478 len = sprintf(page, KERN_ERR PRINTK_HEADER
479 " I/O status report for device %s:\n",
480 dev_name(&device->cdev->dev));
481 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
482 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
483 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
484 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
485 " device %s: Failing CCW: %p\n",
486 dev_name(&device->cdev->dev),
487 (void *) (addr_t) irb->scsw.cmd.cpa);
488 if (irb->esw.esw0.erw.cons) {
489 for (sl = 0; sl < 4; sl++) {
490 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
491 " Sense(hex) %2d-%2d:",
492 (8 * sl), ((8 * sl) + 7));
494 for (sct = 0; sct < 8; sct++) {
495 len += sprintf(page + len, " %02x",
496 irb->ecw[8 * sl + sct]);
498 len += sprintf(page + len, "\n");
501 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
502 " SORRY - NO VALID SENSE AVAILABLE\n");
504 printk(KERN_ERR "%s", page);
506 /* dump the Channel Program */
507 /* print first CCWs (maximum 8) */
509 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
510 end = min(act + 8, last);
511 len = sprintf(page, KERN_ERR PRINTK_HEADER
512 " Related CP in req: %p\n", req);
514 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
515 " CCW %p: %08X %08X DAT:",
516 act, ((int *) act)[0], ((int *) act)[1]);
517 for (count = 0; count < 32 && count < act->count;
518 count += sizeof(int))
519 len += sprintf(page + len, " %08X",
520 ((int *) (addr_t) act->cda)
522 len += sprintf(page + len, "\n");
525 printk(KERN_ERR "%s", page);
528 /* print failing CCW area */
530 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
531 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
532 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
534 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
536 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
537 " CCW %p: %08X %08X DAT:",
538 act, ((int *) act)[0], ((int *) act)[1]);
539 for (count = 0; count < 32 && count < act->count;
540 count += sizeof(int))
541 len += sprintf(page + len, " %08X",
542 ((int *) (addr_t) act->cda)
544 len += sprintf(page + len, "\n");
548 /* print last CCWs */
549 if (act < last - 2) {
551 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
553 while (act <= last) {
554 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
555 " CCW %p: %08X %08X DAT:",
556 act, ((int *) act)[0], ((int *) act)[1]);
557 for (count = 0; count < 32 && count < act->count;
558 count += sizeof(int))
559 len += sprintf(page + len, " %08X",
560 ((int *) (addr_t) act->cda)
562 len += sprintf(page + len, "\n");
566 printk(KERN_ERR "%s", page);
567 free_page((unsigned long) page);
571 * max_blocks is dependent on the amount of storage that is available
572 * in the static io buffer for each device. Currently each device has
573 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
574 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
575 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
576 * addition we have one define extent ccw + 16 bytes of data and a
577 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
579 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
580 * We want to fit two into the available memory so that we can immediately
581 * start the next request if one finishes off. That makes 100.1 blocks
582 * for one request. Give a little safety and the result is 96.
584 static struct dasd_discipline dasd_fba_discipline = {
585 .owner = THIS_MODULE,
589 .check_device = dasd_fba_check_characteristics,
590 .do_analysis = dasd_fba_do_analysis,
591 .fill_geometry = dasd_fba_fill_geometry,
592 .start_IO = dasd_start_IO,
593 .term_IO = dasd_term_IO,
594 .handle_terminated_request = dasd_fba_handle_terminated_request,
595 .erp_action = dasd_fba_erp_action,
596 .erp_postaction = dasd_fba_erp_postaction,
597 .handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt,
598 .build_cp = dasd_fba_build_cp,
599 .free_cp = dasd_fba_free_cp,
600 .dump_sense = dasd_fba_dump_sense,
601 .dump_sense_dbf = dasd_fba_dump_sense_dbf,
602 .fill_info = dasd_fba_fill_info,
610 ASCEBC(dasd_fba_discipline.ebcname, 4);
611 ret = ccw_driver_register(&dasd_fba_driver);
613 wait_for_device_probe();
619 dasd_fba_cleanup(void)
621 ccw_driver_unregister(&dasd_fba_driver);
624 module_init(dasd_fba_init);
625 module_exit(dasd_fba_cleanup);