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 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
9 #define KMSG_COMPONENT "dasd"
11 #include <linux/stddef.h>
12 #include <linux/kernel.h>
13 #include <asm/debug.h>
15 #include <linux/slab.h>
16 #include <linux/hdreg.h> /* HDIO_GETGEO */
17 #include <linux/bio.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
21 #include <asm/idals.h>
22 #include <asm/ebcdic.h>
24 #include <asm/todclk.h>
25 #include <asm/ccwdev.h>
32 #endif /* PRINTK_HEADER */
33 #define PRINTK_HEADER "dasd(fba):"
35 #define DASD_FBA_CCW_WRITE 0x41
36 #define DASD_FBA_CCW_READ 0x42
37 #define DASD_FBA_CCW_LOCATE 0x43
38 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
40 MODULE_LICENSE("GPL");
42 static struct dasd_discipline dasd_fba_discipline;
44 struct dasd_fba_private {
45 struct dasd_fba_characteristics rdc_data;
48 static struct ccw_device_id dasd_fba_ids[] = {
49 { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
50 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
51 { /* end of list */ },
54 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
56 static struct ccw_driver dasd_fba_driver; /* see below */
58 dasd_fba_probe(struct ccw_device *cdev)
60 return dasd_generic_probe(cdev, &dasd_fba_discipline);
64 dasd_fba_set_online(struct ccw_device *cdev)
66 return dasd_generic_set_online(cdev, &dasd_fba_discipline);
69 static struct ccw_driver dasd_fba_driver = {
73 .probe = dasd_fba_probe,
74 .remove = dasd_generic_remove,
75 .set_offline = dasd_generic_set_offline,
76 .set_online = dasd_fba_set_online,
77 .notify = dasd_generic_notify,
81 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
82 int blksize, int beg, int nr)
84 ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
87 ccw->cda = (__u32) __pa(data);
88 memset(data, 0, sizeof (struct DE_fba_data));
90 (data->mask).perm = 0x0;
92 (data->mask).perm = 0x1;
94 data->mask.perm = 0x2;
95 data->blk_size = blksize;
97 data->ext_end = nr - 1;
101 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
102 int block_nr, int block_ct)
104 ccw->cmd_code = DASD_FBA_CCW_LOCATE;
107 ccw->cda = (__u32) __pa(data);
108 memset(data, 0, sizeof (struct LO_fba_data));
110 data->operation.cmd = 0x5;
112 data->operation.cmd = 0x6;
114 data->operation.cmd = 0x8;
115 data->blk_nr = block_nr;
116 data->blk_ct = block_ct;
120 dasd_fba_check_characteristics(struct dasd_device *device)
122 struct dasd_block *block;
123 struct dasd_fba_private *private;
124 struct ccw_device *cdev = device->cdev;
127 private = (struct dasd_fba_private *) device->private;
129 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
131 dev_warn(&device->cdev->dev,
132 "Allocating memory for private DASD "
136 device->private = (void *) private;
138 memset(private, 0, sizeof(*private));
140 block = dasd_alloc_block();
142 DBF_EVENT(DBF_WARNING, "could not allocate dasd block "
143 "structure for device: %s",
144 dev_name(&device->cdev->dev));
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, "FBA ", &private->rdc_data,
156 DBF_EVENT(DBF_WARNING, "Read device characteristics returned "
157 "error %d for device: %s",
158 rc, dev_name(&device->cdev->dev));
159 device->block = NULL;
160 dasd_free_block(block);
161 device->private = NULL;
166 dev_info(&device->cdev->dev,
167 "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
173 ((private->rdc_data.blk_bdsa *
174 (private->rdc_data.blk_size >> 9)) >> 11),
175 private->rdc_data.blk_size);
179 static int dasd_fba_do_analysis(struct dasd_block *block)
181 struct dasd_fba_private *private;
184 private = (struct dasd_fba_private *) block->base->private;
185 rc = dasd_check_blocksize(private->rdc_data.blk_size);
187 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
188 private->rdc_data.blk_size);
191 block->blocks = private->rdc_data.blk_bdsa;
192 block->bp_block = private->rdc_data.blk_size;
193 block->s2b_shift = 0; /* bits to shift 512 to get a block */
194 for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
199 static int dasd_fba_fill_geometry(struct dasd_block *block,
200 struct hd_geometry *geo)
202 if (dasd_check_blocksize(block->bp_block) != 0)
204 geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
206 geo->sectors = 128 >> block->s2b_shift;
211 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
213 return dasd_default_erp_action;
217 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
219 if (cqr->function == dasd_default_erp_action)
220 return dasd_default_erp_postaction;
222 DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
227 static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device,
232 /* first of all check for state change pending interrupt */
233 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
234 if ((irb->scsw.cmd.dstat & mask) == mask) {
235 dasd_generic_handle_state_change(device);
239 /* check for unsolicited interrupts */
240 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
241 "unsolicited interrupt received");
242 device->discipline->dump_sense_dbf(device, NULL, irb, "unsolicited");
243 dasd_schedule_device_bh(device);
247 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
248 struct dasd_block *block,
251 struct dasd_fba_private *private;
252 unsigned long *idaws;
253 struct LO_fba_data *LO_data;
254 struct dasd_ccw_req *cqr;
256 struct req_iterator iter;
259 int count, cidaw, cplength, datasize;
260 sector_t recid, first_rec, last_rec;
261 unsigned int blksize, off;
264 private = (struct dasd_fba_private *) block->base->private;
265 if (rq_data_dir(req) == READ) {
266 cmd = DASD_FBA_CCW_READ;
267 } else if (rq_data_dir(req) == WRITE) {
268 cmd = DASD_FBA_CCW_WRITE;
270 return ERR_PTR(-EINVAL);
271 blksize = block->bp_block;
272 /* Calculate record id of first and last block. */
273 first_rec = blk_rq_pos(req) >> block->s2b_shift;
275 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
276 /* Check struct bio and count the number of blocks for the request. */
279 rq_for_each_segment(bv, req, iter) {
280 if (bv->bv_len & (blksize - 1))
281 /* Fba can only do full blocks. */
282 return ERR_PTR(-EINVAL);
283 count += bv->bv_len >> (block->s2b_shift + 9);
284 #if defined(CONFIG_64BIT)
285 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
286 cidaw += bv->bv_len / blksize;
290 if (count != last_rec - first_rec + 1)
291 return ERR_PTR(-EINVAL);
292 /* 1x define extent + 1x locate record + number of blocks */
293 cplength = 2 + count;
294 /* 1x define extent + 1x locate record */
295 datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
296 cidaw * sizeof(unsigned long);
298 * Find out number of additional locate record ccws if the device
299 * can't do data chaining.
301 if (private->rdc_data.mode.bits.data_chain == 0) {
302 cplength += count - 1;
303 datasize += (count - 1)*sizeof(struct LO_fba_data);
305 /* Allocate the ccw request. */
306 cqr = dasd_smalloc_request(dasd_fba_discipline.name,
307 cplength, datasize, memdev);
311 /* First ccw is define extent. */
312 define_extent(ccw++, cqr->data, rq_data_dir(req),
313 block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
314 /* Build locate_record + read/write ccws. */
315 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
316 LO_data = (struct LO_fba_data *) (idaws + cidaw);
317 /* Locate record for all blocks for smart devices. */
318 if (private->rdc_data.mode.bits.data_chain != 0) {
319 ccw[-1].flags |= CCW_FLAG_CC;
320 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
323 rq_for_each_segment(bv, req, iter) {
324 dst = page_address(bv->bv_page) + bv->bv_offset;
325 if (dasd_page_cache) {
326 char *copy = kmem_cache_alloc(dasd_page_cache,
327 GFP_DMA | __GFP_NOWARN);
328 if (copy && rq_data_dir(req) == WRITE)
329 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
331 dst = copy + bv->bv_offset;
333 for (off = 0; off < bv->bv_len; off += blksize) {
334 /* Locate record for stupid devices. */
335 if (private->rdc_data.mode.bits.data_chain == 0) {
336 ccw[-1].flags |= CCW_FLAG_CC;
337 locate_record(ccw, LO_data++,
339 recid - first_rec, 1);
340 ccw->flags = CCW_FLAG_CC;
343 if (recid > first_rec)
344 ccw[-1].flags |= CCW_FLAG_DC;
346 ccw[-1].flags |= CCW_FLAG_CC;
349 ccw->count = block->bp_block;
350 if (idal_is_needed(dst, blksize)) {
351 ccw->cda = (__u32)(addr_t) idaws;
352 ccw->flags = CCW_FLAG_IDA;
353 idaws = idal_create_words(idaws, dst, blksize);
355 ccw->cda = (__u32)(addr_t) dst;
363 if (blk_noretry_request(req) ||
364 block->base->features & DASD_FEATURE_FAILFAST)
365 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
366 cqr->startdev = memdev;
367 cqr->memdev = memdev;
369 cqr->expires = 5 * 60 * HZ; /* 5 minutes */
371 cqr->buildclk = get_clock();
372 cqr->status = DASD_CQR_FILLED;
377 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
379 struct dasd_fba_private *private;
381 struct req_iterator iter;
384 unsigned int blksize, off;
387 if (!dasd_page_cache)
389 private = (struct dasd_fba_private *) cqr->block->base->private;
390 blksize = cqr->block->bp_block;
392 /* Skip over define extent & locate record. */
394 if (private->rdc_data.mode.bits.data_chain != 0)
396 rq_for_each_segment(bv, req, iter) {
397 dst = page_address(bv->bv_page) + bv->bv_offset;
398 for (off = 0; off < bv->bv_len; off += blksize) {
399 /* Skip locate record. */
400 if (private->rdc_data.mode.bits.data_chain == 0)
403 if (ccw->flags & CCW_FLAG_IDA)
404 cda = *((char **)((addr_t) ccw->cda));
406 cda = (char *)((addr_t) ccw->cda);
408 if (rq_data_dir(req) == READ)
409 memcpy(dst, cda, bv->bv_len);
410 kmem_cache_free(dasd_page_cache,
411 (void *)((addr_t)cda & PAGE_MASK));
419 status = cqr->status == DASD_CQR_DONE;
420 dasd_sfree_request(cqr, cqr->memdev);
424 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
426 cqr->status = DASD_CQR_FILLED;
430 dasd_fba_fill_info(struct dasd_device * device,
431 struct dasd_information2_t * info)
433 info->label_block = 1;
434 info->FBA_layout = 1;
435 info->format = DASD_FORMAT_LDL;
436 info->characteristics_size = sizeof(struct dasd_fba_characteristics);
437 memcpy(info->characteristics,
438 &((struct dasd_fba_private *) device->private)->rdc_data,
439 sizeof (struct dasd_fba_characteristics));
440 info->confdata_size = 0;
445 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct dasd_ccw_req *req,
446 struct irb *irb, char *reason)
449 if (irb->esw.esw0.erw.cons) {
450 for (sl = 0; sl < 4; sl++) {
451 DBF_DEV_EVENT(DBF_EMERG, device,
452 "%s: %08x %08x %08x %08x",
453 reason, irb->ecw[8 * 0], irb->ecw[8 * 1],
454 irb->ecw[8 * 2], irb->ecw[8 * 3]);
457 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
458 "SORRY - NO VALID SENSE AVAILABLE\n");
464 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
468 struct ccw1 *act, *end, *last;
469 int len, sl, sct, count;
471 page = (char *) get_zeroed_page(GFP_ATOMIC);
473 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
474 "No memory to dump sense data");
477 len = sprintf(page, KERN_ERR PRINTK_HEADER
478 " I/O status report for device %s:\n",
479 dev_name(&device->cdev->dev));
480 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
481 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
482 irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
483 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
484 " device %s: Failing CCW: %p\n",
485 dev_name(&device->cdev->dev),
486 (void *) (addr_t) irb->scsw.cmd.cpa);
487 if (irb->esw.esw0.erw.cons) {
488 for (sl = 0; sl < 4; sl++) {
489 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
490 " Sense(hex) %2d-%2d:",
491 (8 * sl), ((8 * sl) + 7));
493 for (sct = 0; sct < 8; sct++) {
494 len += sprintf(page + len, " %02x",
495 irb->ecw[8 * sl + sct]);
497 len += sprintf(page + len, "\n");
500 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
501 " SORRY - NO VALID SENSE AVAILABLE\n");
503 printk(KERN_ERR "%s", page);
505 /* dump the Channel Program */
506 /* print first CCWs (maximum 8) */
508 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
509 end = min(act + 8, last);
510 len = sprintf(page, KERN_ERR PRINTK_HEADER
511 " Related CP in req: %p\n", req);
513 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
514 " CCW %p: %08X %08X DAT:",
515 act, ((int *) act)[0], ((int *) act)[1]);
516 for (count = 0; count < 32 && count < act->count;
517 count += sizeof(int))
518 len += sprintf(page + len, " %08X",
519 ((int *) (addr_t) act->cda)
521 len += sprintf(page + len, "\n");
524 printk(KERN_ERR "%s", page);
527 /* print failing CCW area */
529 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
530 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
531 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
533 end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
535 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
536 " CCW %p: %08X %08X DAT:",
537 act, ((int *) act)[0], ((int *) act)[1]);
538 for (count = 0; count < 32 && count < act->count;
539 count += sizeof(int))
540 len += sprintf(page + len, " %08X",
541 ((int *) (addr_t) act->cda)
543 len += sprintf(page + len, "\n");
547 /* print last CCWs */
548 if (act < last - 2) {
550 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
552 while (act <= last) {
553 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
554 " CCW %p: %08X %08X DAT:",
555 act, ((int *) act)[0], ((int *) act)[1]);
556 for (count = 0; count < 32 && count < act->count;
557 count += sizeof(int))
558 len += sprintf(page + len, " %08X",
559 ((int *) (addr_t) act->cda)
561 len += sprintf(page + len, "\n");
565 printk(KERN_ERR "%s", page);
566 free_page((unsigned long) page);
570 * max_blocks is dependent on the amount of storage that is available
571 * in the static io buffer for each device. Currently each device has
572 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
573 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
574 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
575 * addition we have one define extent ccw + 16 bytes of data and a
576 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
578 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
579 * We want to fit two into the available memory so that we can immediately
580 * start the next request if one finishes off. That makes 100.1 blocks
581 * for one request. Give a little safety and the result is 96.
583 static struct dasd_discipline dasd_fba_discipline = {
584 .owner = THIS_MODULE,
588 .check_device = dasd_fba_check_characteristics,
589 .do_analysis = dasd_fba_do_analysis,
590 .fill_geometry = dasd_fba_fill_geometry,
591 .start_IO = dasd_start_IO,
592 .term_IO = dasd_term_IO,
593 .handle_terminated_request = dasd_fba_handle_terminated_request,
594 .erp_action = dasd_fba_erp_action,
595 .erp_postaction = dasd_fba_erp_postaction,
596 .handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt,
597 .build_cp = dasd_fba_build_cp,
598 .free_cp = dasd_fba_free_cp,
599 .dump_sense = dasd_fba_dump_sense,
600 .dump_sense_dbf = dasd_fba_dump_sense_dbf,
601 .fill_info = dasd_fba_fill_info,
609 ASCEBC(dasd_fba_discipline.ebcname, 4);
610 ret = ccw_driver_register(&dasd_fba_driver);
612 wait_for_device_probe();
618 dasd_fba_cleanup(void)
620 ccw_driver_unregister(&dasd_fba_driver);
623 module_init(dasd_fba_init);
624 module_exit(dasd_fba_cleanup);