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 #include <linux/stddef.h>
10 #include <linux/kernel.h>
11 #include <asm/debug.h>
13 #include <linux/slab.h>
14 #include <linux/hdreg.h> /* HDIO_GETGEO */
15 #include <linux/bio.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
19 #include <asm/idals.h>
20 #include <asm/ebcdic.h>
22 #include <asm/todclk.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
,
79 define_extent(struct ccw1
* ccw
, struct DE_fba_data
*data
, int rw
,
80 int blksize
, int beg
, int nr
)
82 ccw
->cmd_code
= DASD_FBA_CCW_DEFINE_EXTENT
;
85 ccw
->cda
= (__u32
) __pa(data
);
86 memset(data
, 0, sizeof (struct DE_fba_data
));
88 (data
->mask
).perm
= 0x0;
90 (data
->mask
).perm
= 0x1;
92 data
->mask
.perm
= 0x2;
93 data
->blk_size
= blksize
;
95 data
->ext_end
= nr
- 1;
99 locate_record(struct ccw1
* ccw
, struct LO_fba_data
*data
, int rw
,
100 int block_nr
, int block_ct
)
102 ccw
->cmd_code
= DASD_FBA_CCW_LOCATE
;
105 ccw
->cda
= (__u32
) __pa(data
);
106 memset(data
, 0, sizeof (struct LO_fba_data
));
108 data
->operation
.cmd
= 0x5;
110 data
->operation
.cmd
= 0x6;
112 data
->operation
.cmd
= 0x8;
113 data
->blk_nr
= block_nr
;
114 data
->blk_ct
= block_ct
;
118 dasd_fba_check_characteristics(struct dasd_device
*device
)
120 struct dasd_block
*block
;
121 struct dasd_fba_private
*private;
122 struct ccw_device
*cdev
= device
->cdev
;
126 private = (struct dasd_fba_private
*) device
->private;
127 if (private == NULL
) {
128 private = kzalloc(sizeof(struct dasd_fba_private
),
129 GFP_KERNEL
| GFP_DMA
);
130 if (private == NULL
) {
131 DEV_MESSAGE(KERN_WARNING
, device
, "%s",
132 "memory allocation failed for private "
136 device
->private = (void *) private;
138 block
= dasd_alloc_block();
140 DEV_MESSAGE(KERN_WARNING
, device
, "%s",
141 "could not allocate dasd block structure");
142 kfree(device
->private);
143 return PTR_ERR(block
);
145 device
->block
= block
;
146 block
->base
= device
;
148 /* Read Device Characteristics */
149 rdc_data
= (void *) &(private->rdc_data
);
150 rc
= dasd_generic_read_dev_chars(device
, "FBA ", &rdc_data
, 32);
152 DEV_MESSAGE(KERN_WARNING
, device
,
153 "Read device characteristics returned error %d",
158 DEV_MESSAGE(KERN_INFO
, device
,
159 "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
164 ((private->rdc_data
.blk_bdsa
*
165 (private->rdc_data
.blk_size
>> 9)) >> 11),
166 private->rdc_data
.blk_size
);
170 static int dasd_fba_do_analysis(struct dasd_block
*block
)
172 struct dasd_fba_private
*private;
175 private = (struct dasd_fba_private
*) block
->base
->private;
176 rc
= dasd_check_blocksize(private->rdc_data
.blk_size
);
178 DEV_MESSAGE(KERN_INFO
, block
->base
, "unknown blocksize %d",
179 private->rdc_data
.blk_size
);
182 block
->blocks
= private->rdc_data
.blk_bdsa
;
183 block
->bp_block
= private->rdc_data
.blk_size
;
184 block
->s2b_shift
= 0; /* bits to shift 512 to get a block */
185 for (sb
= 512; sb
< private->rdc_data
.blk_size
; sb
= sb
<< 1)
190 static int dasd_fba_fill_geometry(struct dasd_block
*block
,
191 struct hd_geometry
*geo
)
193 if (dasd_check_blocksize(block
->bp_block
) != 0)
195 geo
->cylinders
= (block
->blocks
<< block
->s2b_shift
) >> 10;
197 geo
->sectors
= 128 >> block
->s2b_shift
;
202 dasd_fba_erp_action(struct dasd_ccw_req
* cqr
)
204 return dasd_default_erp_action
;
208 dasd_fba_erp_postaction(struct dasd_ccw_req
* cqr
)
210 if (cqr
->function
== dasd_default_erp_action
)
211 return dasd_default_erp_postaction
;
213 DEV_MESSAGE(KERN_WARNING
, cqr
->startdev
, "unknown ERP action %p",
218 static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device
*device
,
223 /* first of all check for state change pending interrupt */
224 mask
= DEV_STAT_ATTENTION
| DEV_STAT_DEV_END
| DEV_STAT_UNIT_EXCEP
;
225 if ((irb
->scsw
.dstat
& mask
) == mask
) {
226 dasd_generic_handle_state_change(device
);
230 /* check for unsolicited interrupts */
231 DEV_MESSAGE(KERN_DEBUG
, device
, "%s",
232 "unsolicited interrupt received");
233 device
->discipline
->dump_sense(device
, NULL
, irb
);
234 dasd_schedule_device_bh(device
);
238 static struct dasd_ccw_req
*dasd_fba_build_cp(struct dasd_device
* memdev
,
239 struct dasd_block
*block
,
242 struct dasd_fba_private
*private;
243 unsigned long *idaws
;
244 struct LO_fba_data
*LO_data
;
245 struct dasd_ccw_req
*cqr
;
247 struct req_iterator iter
;
250 int count
, cidaw
, cplength
, datasize
;
251 sector_t recid
, first_rec
, last_rec
;
252 unsigned int blksize
, off
;
255 private = (struct dasd_fba_private
*) block
->base
->private;
256 if (rq_data_dir(req
) == READ
) {
257 cmd
= DASD_FBA_CCW_READ
;
258 } else if (rq_data_dir(req
) == WRITE
) {
259 cmd
= DASD_FBA_CCW_WRITE
;
261 return ERR_PTR(-EINVAL
);
262 blksize
= block
->bp_block
;
263 /* Calculate record id of first and last block. */
264 first_rec
= req
->sector
>> block
->s2b_shift
;
265 last_rec
= (req
->sector
+ req
->nr_sectors
- 1) >> block
->s2b_shift
;
266 /* Check struct bio and count the number of blocks for the request. */
269 rq_for_each_segment(bv
, req
, iter
) {
270 if (bv
->bv_len
& (blksize
- 1))
271 /* Fba can only do full blocks. */
272 return ERR_PTR(-EINVAL
);
273 count
+= bv
->bv_len
>> (block
->s2b_shift
+ 9);
274 #if defined(CONFIG_64BIT)
275 if (idal_is_needed (page_address(bv
->bv_page
), bv
->bv_len
))
276 cidaw
+= bv
->bv_len
/ blksize
;
280 if (count
!= last_rec
- first_rec
+ 1)
281 return ERR_PTR(-EINVAL
);
282 /* 1x define extent + 1x locate record + number of blocks */
283 cplength
= 2 + count
;
284 /* 1x define extent + 1x locate record */
285 datasize
= sizeof(struct DE_fba_data
) + sizeof(struct LO_fba_data
) +
286 cidaw
* sizeof(unsigned long);
288 * Find out number of additional locate record ccws if the device
289 * can't do data chaining.
291 if (private->rdc_data
.mode
.bits
.data_chain
== 0) {
292 cplength
+= count
- 1;
293 datasize
+= (count
- 1)*sizeof(struct LO_fba_data
);
295 /* Allocate the ccw request. */
296 cqr
= dasd_smalloc_request(dasd_fba_discipline
.name
,
297 cplength
, datasize
, memdev
);
301 /* First ccw is define extent. */
302 define_extent(ccw
++, cqr
->data
, rq_data_dir(req
),
303 block
->bp_block
, req
->sector
, req
->nr_sectors
);
304 /* Build locate_record + read/write ccws. */
305 idaws
= (unsigned long *) (cqr
->data
+ sizeof(struct DE_fba_data
));
306 LO_data
= (struct LO_fba_data
*) (idaws
+ cidaw
);
307 /* Locate record for all blocks for smart devices. */
308 if (private->rdc_data
.mode
.bits
.data_chain
!= 0) {
309 ccw
[-1].flags
|= CCW_FLAG_CC
;
310 locate_record(ccw
++, LO_data
++, rq_data_dir(req
), 0, count
);
313 rq_for_each_segment(bv
, req
, iter
) {
314 dst
= page_address(bv
->bv_page
) + bv
->bv_offset
;
315 if (dasd_page_cache
) {
316 char *copy
= kmem_cache_alloc(dasd_page_cache
,
317 GFP_DMA
| __GFP_NOWARN
);
318 if (copy
&& rq_data_dir(req
) == WRITE
)
319 memcpy(copy
+ bv
->bv_offset
, dst
, bv
->bv_len
);
321 dst
= copy
+ bv
->bv_offset
;
323 for (off
= 0; off
< bv
->bv_len
; off
+= blksize
) {
324 /* Locate record for stupid devices. */
325 if (private->rdc_data
.mode
.bits
.data_chain
== 0) {
326 ccw
[-1].flags
|= CCW_FLAG_CC
;
327 locate_record(ccw
, LO_data
++,
329 recid
- first_rec
, 1);
330 ccw
->flags
= CCW_FLAG_CC
;
333 if (recid
> first_rec
)
334 ccw
[-1].flags
|= CCW_FLAG_DC
;
336 ccw
[-1].flags
|= CCW_FLAG_CC
;
339 ccw
->count
= block
->bp_block
;
340 if (idal_is_needed(dst
, blksize
)) {
341 ccw
->cda
= (__u32
)(addr_t
) idaws
;
342 ccw
->flags
= CCW_FLAG_IDA
;
343 idaws
= idal_create_words(idaws
, dst
, blksize
);
345 ccw
->cda
= (__u32
)(addr_t
) dst
;
353 if (req
->cmd_flags
& REQ_FAILFAST
)
354 set_bit(DASD_CQR_FLAGS_FAILFAST
, &cqr
->flags
);
355 cqr
->startdev
= memdev
;
356 cqr
->memdev
= memdev
;
358 cqr
->expires
= 5 * 60 * HZ
; /* 5 minutes */
360 cqr
->buildclk
= get_clock();
361 cqr
->status
= DASD_CQR_FILLED
;
366 dasd_fba_free_cp(struct dasd_ccw_req
*cqr
, struct request
*req
)
368 struct dasd_fba_private
*private;
370 struct req_iterator iter
;
373 unsigned int blksize
, off
;
376 if (!dasd_page_cache
)
378 private = (struct dasd_fba_private
*) cqr
->block
->base
->private;
379 blksize
= cqr
->block
->bp_block
;
381 /* Skip over define extent & locate record. */
383 if (private->rdc_data
.mode
.bits
.data_chain
!= 0)
385 rq_for_each_segment(bv
, req
, iter
) {
386 dst
= page_address(bv
->bv_page
) + bv
->bv_offset
;
387 for (off
= 0; off
< bv
->bv_len
; off
+= blksize
) {
388 /* Skip locate record. */
389 if (private->rdc_data
.mode
.bits
.data_chain
== 0)
392 if (ccw
->flags
& CCW_FLAG_IDA
)
393 cda
= *((char **)((addr_t
) ccw
->cda
));
395 cda
= (char *)((addr_t
) ccw
->cda
);
397 if (rq_data_dir(req
) == READ
)
398 memcpy(dst
, cda
, bv
->bv_len
);
399 kmem_cache_free(dasd_page_cache
,
400 (void *)((addr_t
)cda
& PAGE_MASK
));
408 status
= cqr
->status
== DASD_CQR_DONE
;
409 dasd_sfree_request(cqr
, cqr
->memdev
);
413 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req
*cqr
)
415 cqr
->status
= DASD_CQR_FILLED
;
419 dasd_fba_fill_info(struct dasd_device
* device
,
420 struct dasd_information2_t
* info
)
422 info
->label_block
= 1;
423 info
->FBA_layout
= 1;
424 info
->format
= DASD_FORMAT_LDL
;
425 info
->characteristics_size
= sizeof(struct dasd_fba_characteristics
);
426 memcpy(info
->characteristics
,
427 &((struct dasd_fba_private
*) device
->private)->rdc_data
,
428 sizeof (struct dasd_fba_characteristics
));
429 info
->confdata_size
= 0;
434 dasd_fba_dump_sense(struct dasd_device
*device
, struct dasd_ccw_req
* req
,
438 struct ccw1
*act
, *end
, *last
;
439 int len
, sl
, sct
, count
;
441 page
= (char *) get_zeroed_page(GFP_ATOMIC
);
443 DEV_MESSAGE(KERN_ERR
, device
, " %s",
444 "No memory to dump sense data");
447 len
= sprintf(page
, KERN_ERR PRINTK_HEADER
448 " I/O status report for device %s:\n",
449 device
->cdev
->dev
.bus_id
);
450 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
451 " in req: %p CS: 0x%02X DS: 0x%02X\n", req
,
452 irb
->scsw
.cstat
, irb
->scsw
.dstat
);
453 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
454 " device %s: Failing CCW: %p\n",
455 device
->cdev
->dev
.bus_id
,
456 (void *) (addr_t
) irb
->scsw
.cpa
);
457 if (irb
->esw
.esw0
.erw
.cons
) {
458 for (sl
= 0; sl
< 4; sl
++) {
459 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
460 " Sense(hex) %2d-%2d:",
461 (8 * sl
), ((8 * sl
) + 7));
463 for (sct
= 0; sct
< 8; sct
++) {
464 len
+= sprintf(page
+ len
, " %02x",
465 irb
->ecw
[8 * sl
+ sct
]);
467 len
+= sprintf(page
+ len
, "\n");
470 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
471 " SORRY - NO VALID SENSE AVAILABLE\n");
473 MESSAGE_LOG(KERN_ERR
, "%s",
474 page
+ sizeof(KERN_ERR PRINTK_HEADER
));
476 /* dump the Channel Program */
477 /* print first CCWs (maximum 8) */
479 for (last
= act
; last
->flags
& (CCW_FLAG_CC
| CCW_FLAG_DC
); last
++);
480 end
= min(act
+ 8, last
);
481 len
= sprintf(page
, KERN_ERR PRINTK_HEADER
482 " Related CP in req: %p\n", req
);
484 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
485 " CCW %p: %08X %08X DAT:",
486 act
, ((int *) act
)[0], ((int *) act
)[1]);
487 for (count
= 0; count
< 32 && count
< act
->count
;
488 count
+= sizeof(int))
489 len
+= sprintf(page
+ len
, " %08X",
490 ((int *) (addr_t
) act
->cda
)
492 len
+= sprintf(page
+ len
, "\n");
495 MESSAGE_LOG(KERN_ERR
, "%s",
496 page
+ sizeof(KERN_ERR PRINTK_HEADER
));
499 /* print failing CCW area */
501 if (act
< ((struct ccw1
*)(addr_t
) irb
->scsw
.cpa
) - 2) {
502 act
= ((struct ccw1
*)(addr_t
) irb
->scsw
.cpa
) - 2;
503 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
"......\n");
505 end
= min((struct ccw1
*)(addr_t
) irb
->scsw
.cpa
+ 2, last
);
507 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
508 " CCW %p: %08X %08X DAT:",
509 act
, ((int *) act
)[0], ((int *) act
)[1]);
510 for (count
= 0; count
< 32 && count
< act
->count
;
511 count
+= sizeof(int))
512 len
+= sprintf(page
+ len
, " %08X",
513 ((int *) (addr_t
) act
->cda
)
515 len
+= sprintf(page
+ len
, "\n");
519 /* print last CCWs */
520 if (act
< last
- 2) {
522 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
"......\n");
524 while (act
<= last
) {
525 len
+= sprintf(page
+ len
, KERN_ERR PRINTK_HEADER
526 " CCW %p: %08X %08X DAT:",
527 act
, ((int *) act
)[0], ((int *) act
)[1]);
528 for (count
= 0; count
< 32 && count
< act
->count
;
529 count
+= sizeof(int))
530 len
+= sprintf(page
+ len
, " %08X",
531 ((int *) (addr_t
) act
->cda
)
533 len
+= sprintf(page
+ len
, "\n");
537 MESSAGE_LOG(KERN_ERR
, "%s",
538 page
+ sizeof(KERN_ERR PRINTK_HEADER
));
539 free_page((unsigned long) page
);
543 * max_blocks is dependent on the amount of storage that is available
544 * in the static io buffer for each device. Currently each device has
545 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
546 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
547 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
548 * addition we have one define extent ccw + 16 bytes of data and a
549 * locate record ccw for each block (stupid devices!) + 16 bytes of data.
551 * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
552 * We want to fit two into the available memory so that we can immediately
553 * start the next request if one finishes off. That makes 100.1 blocks
554 * for one request. Give a little safety and the result is 96.
556 static struct dasd_discipline dasd_fba_discipline
= {
557 .owner
= THIS_MODULE
,
561 .check_device
= dasd_fba_check_characteristics
,
562 .do_analysis
= dasd_fba_do_analysis
,
563 .fill_geometry
= dasd_fba_fill_geometry
,
564 .start_IO
= dasd_start_IO
,
565 .term_IO
= dasd_term_IO
,
566 .handle_terminated_request
= dasd_fba_handle_terminated_request
,
567 .erp_action
= dasd_fba_erp_action
,
568 .erp_postaction
= dasd_fba_erp_postaction
,
569 .handle_unsolicited_interrupt
= dasd_fba_handle_unsolicited_interrupt
,
570 .build_cp
= dasd_fba_build_cp
,
571 .free_cp
= dasd_fba_free_cp
,
572 .dump_sense
= dasd_fba_dump_sense
,
573 .fill_info
= dasd_fba_fill_info
,
579 ASCEBC(dasd_fba_discipline
.ebcname
, 4);
580 return ccw_driver_register(&dasd_fba_driver
);
584 dasd_fba_cleanup(void)
586 ccw_driver_unregister(&dasd_fba_driver
);
589 module_init(dasd_fba_init
);
590 module_exit(dasd_fba_cleanup
);