2 * File...........: linux/drivers/s390/block/dasd_eckd.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
13 #include <linux/config.h>
14 #include <linux/stddef.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/hdreg.h> /* HDIO_GETGEO */
18 #include <linux/bio.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
22 #include <asm/debug.h>
23 #include <asm/idals.h>
24 #include <asm/ebcdic.h>
26 #include <asm/todclk.h>
27 #include <asm/uaccess.h>
28 #include <asm/ccwdev.h>
31 #include "dasd_eckd.h"
35 #endif /* PRINTK_HEADER */
36 #define PRINTK_HEADER "dasd(eckd):"
38 #define ECKD_C0(i) (i->home_bytes)
39 #define ECKD_F(i) (i->formula)
40 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):(i->factors.f_0x02.f1))
41 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):(i->factors.f_0x02.f2))
42 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):(i->factors.f_0x02.f3))
43 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
44 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
45 #define ECKD_F6(i) (i->factor6)
46 #define ECKD_F7(i) (i->factor7)
47 #define ECKD_F8(i) (i->factor8)
49 MODULE_LICENSE("GPL");
51 static struct dasd_discipline dasd_eckd_discipline;
53 struct dasd_eckd_private {
54 struct dasd_eckd_characteristics rdc_data;
55 struct dasd_eckd_confdata conf_data;
56 struct eckd_count count_area[5];
59 struct attrib_data_t attrib; /* e.g. cache operations */
62 /* The ccw bus type uses this table to find devices that it sends to
64 static struct ccw_device_id dasd_eckd_ids[] = {
65 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), driver_info: 0x1},
66 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), driver_info: 0x2},
67 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), driver_info: 0x3},
68 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), driver_info: 0x4},
69 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), driver_info: 0x5},
70 { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), driver_info: 0x6},
71 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), driver_info: 0x7},
72 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), driver_info: 0x8},
73 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), driver_info: 0x9},
74 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), driver_info: 0xa},
75 { /* end of list */ },
78 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
80 static struct ccw_driver dasd_eckd_driver; /* see below */
82 /* initial attempt at a probe function. this can be simplified once
83 * the other detection code is gone */
85 dasd_eckd_probe (struct ccw_device *cdev)
89 ret = dasd_generic_probe (cdev, &dasd_eckd_discipline);
92 ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP | CCWDEV_ALLOW_FORCE);
97 dasd_eckd_set_online(struct ccw_device *cdev)
99 return dasd_generic_set_online (cdev, &dasd_eckd_discipline);
102 static struct ccw_driver dasd_eckd_driver = {
104 .owner = THIS_MODULE,
105 .ids = dasd_eckd_ids,
106 .probe = dasd_eckd_probe,
107 .remove = dasd_generic_remove,
108 .set_offline = dasd_generic_set_offline,
109 .set_online = dasd_eckd_set_online,
110 .notify = dasd_generic_notify,
113 static const int sizes_trk0[] = { 28, 148, 84 };
114 #define LABEL_SIZE 140
116 static inline unsigned int
117 round_up_multiple(unsigned int no, unsigned int mult)
120 return (rem ? no - rem + mult : no);
123 static inline unsigned int
124 ceil_quot(unsigned int d1, unsigned int d2)
126 return (d1 + (d2 - 1)) / d2;
130 bytes_per_record(struct dasd_eckd_characteristics *rdc, int kl, int dl)
132 unsigned int fl1, fl2, int1, int2;
135 switch (rdc->formula) {
137 fl1 = round_up_multiple(ECKD_F2(rdc) + dl, ECKD_F1(rdc));
138 fl2 = round_up_multiple(kl ? ECKD_F2(rdc) + kl : 0,
143 int1 = ceil_quot(dl + ECKD_F6(rdc), ECKD_F5(rdc) << 1);
144 int2 = ceil_quot(kl + ECKD_F6(rdc), ECKD_F5(rdc) << 1);
145 fl1 = round_up_multiple(ECKD_F1(rdc) * ECKD_F2(rdc) + dl +
146 ECKD_F6(rdc) + ECKD_F4(rdc) * int1,
148 fl2 = round_up_multiple(ECKD_F1(rdc) * ECKD_F3(rdc) + kl +
149 ECKD_F6(rdc) + ECKD_F4(rdc) * int2,
154 MESSAGE(KERN_ERR, "unknown formula%d", rdc->formula);
161 static inline unsigned int
162 bytes_per_track(struct dasd_eckd_characteristics *rdc)
164 return *(unsigned int *) (rdc->byte_per_track) >> 8;
167 static inline unsigned int
168 recs_per_track(struct dasd_eckd_characteristics * rdc,
169 unsigned int kl, unsigned int dl)
173 switch (rdc->dev_type) {
176 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
177 ceil_quot(dl + 12, 32));
179 return 1499 / (15 + ceil_quot(dl + 12, 32));
181 dn = ceil_quot(dl + 6, 232) + 1;
183 kn = ceil_quot(kl + 6, 232) + 1;
184 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
185 9 + ceil_quot(dl + 6 * dn, 34));
187 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
189 dn = ceil_quot(dl + 6, 232) + 1;
191 kn = ceil_quot(kl + 6, 232) + 1;
192 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
193 ceil_quot(dl + 6 * dn, 34));
195 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
201 check_XRC (struct ccw1 *de_ccw,
202 struct DE_eckd_data *data,
203 struct dasd_device *device)
205 struct dasd_eckd_private *private;
207 private = (struct dasd_eckd_private *) device->private;
209 /* switch on System Time Stamp - needed for XRC Support */
210 if (private->rdc_data.facilities.XRC_supported) {
212 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
213 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
215 data->ep_sys_time = get_clock ();
217 de_ccw->count = sizeof (struct DE_eckd_data);
218 de_ccw->flags |= CCW_FLAG_SLI;
223 } /* end check_XRC */
226 define_extent(struct ccw1 * ccw, struct DE_eckd_data * data, int trk,
227 int totrk, int cmd, struct dasd_device * device)
229 struct dasd_eckd_private *private;
230 struct ch_t geo, beg, end;
232 private = (struct dasd_eckd_private *) device->private;
234 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
237 ccw->cda = (__u32) __pa(data);
239 memset(data, 0, sizeof (struct DE_eckd_data));
241 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
242 case DASD_ECKD_CCW_READ_RECORD_ZERO:
243 case DASD_ECKD_CCW_READ:
244 case DASD_ECKD_CCW_READ_MT:
245 case DASD_ECKD_CCW_READ_CKD:
246 case DASD_ECKD_CCW_READ_CKD_MT:
247 case DASD_ECKD_CCW_READ_KD:
248 case DASD_ECKD_CCW_READ_KD_MT:
249 case DASD_ECKD_CCW_READ_COUNT:
250 data->mask.perm = 0x1;
251 data->attributes.operation = private->attrib.operation;
253 case DASD_ECKD_CCW_WRITE:
254 case DASD_ECKD_CCW_WRITE_MT:
255 case DASD_ECKD_CCW_WRITE_KD:
256 case DASD_ECKD_CCW_WRITE_KD_MT:
257 data->mask.perm = 0x02;
258 data->attributes.operation = private->attrib.operation;
259 check_XRC (ccw, data, device);
261 case DASD_ECKD_CCW_WRITE_CKD:
262 case DASD_ECKD_CCW_WRITE_CKD_MT:
263 data->attributes.operation = DASD_BYPASS_CACHE;
264 check_XRC (ccw, data, device);
266 case DASD_ECKD_CCW_ERASE:
267 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
268 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
269 data->mask.perm = 0x3;
270 data->mask.auth = 0x1;
271 data->attributes.operation = DASD_BYPASS_CACHE;
272 check_XRC (ccw, data, device);
275 MESSAGE(KERN_ERR, "unknown opcode 0x%x", cmd);
279 data->attributes.mode = 0x3; /* ECKD */
281 if ((private->rdc_data.cu_type == 0x2105 ||
282 private->rdc_data.cu_type == 0x2107 ||
283 private->rdc_data.cu_type == 0x1750)
284 && !(private->uses_cdl && trk < 2))
285 data->ga_extended |= 0x40; /* Regular Data Format Mode */
287 geo.cyl = private->rdc_data.no_cyl;
288 geo.head = private->rdc_data.trk_per_cyl;
289 beg.cyl = trk / geo.head;
290 beg.head = trk % geo.head;
291 end.cyl = totrk / geo.head;
292 end.head = totrk % geo.head;
294 /* check for sequential prestage - enhance cylinder range */
295 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
296 data->attributes.operation == DASD_SEQ_ACCESS) {
298 if (end.cyl + private->attrib.nr_cyl < geo.cyl)
299 end.cyl += private->attrib.nr_cyl;
301 end.cyl = (geo.cyl - 1);
304 data->beg_ext.cyl = beg.cyl;
305 data->beg_ext.head = beg.head;
306 data->end_ext.cyl = end.cyl;
307 data->end_ext.head = end.head;
311 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk,
312 int rec_on_trk, int no_rec, int cmd,
313 struct dasd_device * device, int reclen)
315 struct dasd_eckd_private *private;
319 private = (struct dasd_eckd_private *) device->private;
322 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
323 trk, rec_on_trk, no_rec, cmd, reclen);
325 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
328 ccw->cda = (__u32) __pa(data);
330 memset(data, 0, sizeof (struct LO_eckd_data));
333 switch (private->rdc_data.dev_type) {
335 dn = ceil_quot(reclen + 6, 232);
336 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
337 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
340 d = 7 + ceil_quot(reclen + 12, 32);
341 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
345 data->sector = sector;
346 data->count = no_rec;
348 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
349 data->operation.orientation = 0x3;
350 data->operation.operation = 0x03;
352 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
353 data->operation.orientation = 0x3;
354 data->operation.operation = 0x16;
356 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
357 data->operation.orientation = 0x1;
358 data->operation.operation = 0x03;
361 case DASD_ECKD_CCW_READ_RECORD_ZERO:
362 data->operation.orientation = 0x3;
363 data->operation.operation = 0x16;
366 case DASD_ECKD_CCW_WRITE:
367 case DASD_ECKD_CCW_WRITE_MT:
368 case DASD_ECKD_CCW_WRITE_KD:
369 case DASD_ECKD_CCW_WRITE_KD_MT:
370 data->auxiliary.last_bytes_used = 0x1;
371 data->length = reclen;
372 data->operation.operation = 0x01;
374 case DASD_ECKD_CCW_WRITE_CKD:
375 case DASD_ECKD_CCW_WRITE_CKD_MT:
376 data->auxiliary.last_bytes_used = 0x1;
377 data->length = reclen;
378 data->operation.operation = 0x03;
380 case DASD_ECKD_CCW_READ:
381 case DASD_ECKD_CCW_READ_MT:
382 case DASD_ECKD_CCW_READ_KD:
383 case DASD_ECKD_CCW_READ_KD_MT:
384 data->auxiliary.last_bytes_used = 0x1;
385 data->length = reclen;
386 data->operation.operation = 0x06;
388 case DASD_ECKD_CCW_READ_CKD:
389 case DASD_ECKD_CCW_READ_CKD_MT:
390 data->auxiliary.last_bytes_used = 0x1;
391 data->length = reclen;
392 data->operation.operation = 0x16;
394 case DASD_ECKD_CCW_READ_COUNT:
395 data->operation.operation = 0x06;
397 case DASD_ECKD_CCW_ERASE:
398 data->length = reclen;
399 data->auxiliary.last_bytes_used = 0x1;
400 data->operation.operation = 0x0b;
403 MESSAGE(KERN_ERR, "unknown opcode 0x%x", cmd);
405 data->seek_addr.cyl = data->search_arg.cyl =
406 trk / private->rdc_data.trk_per_cyl;
407 data->seek_addr.head = data->search_arg.head =
408 trk % private->rdc_data.trk_per_cyl;
409 data->search_arg.record = rec_on_trk;
413 * Returns 1 if the block is one of the special blocks that needs
414 * to get read/written with the KD variant of the command.
415 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
416 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
417 * Luckily the KD variants differ only by one bit (0x08) from the
418 * normal variant. So don't wonder about code like:
419 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
420 * ccw->cmd_code |= 0x8;
423 dasd_eckd_cdl_special(int blk_per_trk, int recid)
427 if (recid < blk_per_trk)
429 if (recid < 2 * blk_per_trk)
435 * Returns the record size for the special blocks of the cdl format.
436 * Only returns something useful if dasd_eckd_cdl_special is true
440 dasd_eckd_cdl_reclen(int recid)
443 return sizes_trk0[recid];
448 dasd_eckd_check_characteristics(struct dasd_device *device)
450 struct dasd_eckd_private *private;
456 private = (struct dasd_eckd_private *) device->private;
457 if (private == NULL) {
458 private = kmalloc(sizeof(struct dasd_eckd_private),
459 GFP_KERNEL | GFP_DMA);
460 if (private == NULL) {
461 MESSAGE(KERN_WARNING, "%s",
462 "memory allocation failed for private data");
465 device->private = (void *) private;
467 /* Invalidate status of initial analysis. */
468 private->init_cqr_status = -1;
469 /* Set default cache operations. */
470 private->attrib.operation = DASD_NORMAL_CACHE;
471 private->attrib.nr_cyl = 0;
473 /* Read Device Characteristics */
474 rdc_data = (void *) &(private->rdc_data);
475 rc = read_dev_chars(device->cdev, &rdc_data, 64);
477 MESSAGE(KERN_WARNING,
478 "Read device characteristics returned error %d", rc);
482 DEV_MESSAGE(KERN_INFO, device,
483 "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
484 private->rdc_data.dev_type,
485 private->rdc_data.dev_model,
486 private->rdc_data.cu_type,
487 private->rdc_data.cu_model.model,
488 private->rdc_data.no_cyl,
489 private->rdc_data.trk_per_cyl,
490 private->rdc_data.sec_per_trk);
492 /* Read Configuration Data */
493 rc = read_conf_data(device->cdev, &conf_data, &conf_len);
494 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
495 MESSAGE(KERN_WARNING,
496 "Read configuration data returned error %d", rc);
499 if (conf_data == NULL) {
500 MESSAGE(KERN_WARNING, "%s", "No configuration data retrieved");
501 return 0; /* no errror */
503 if (conf_len != sizeof (struct dasd_eckd_confdata)) {
504 MESSAGE(KERN_WARNING,
505 "sizes of configuration data mismatch"
506 "%d (read) vs %ld (expected)",
507 conf_len, sizeof (struct dasd_eckd_confdata));
509 kfree(conf_data); /* allocated by read_conf_data() */
510 return 0; /* no errror */
512 memcpy(&private->conf_data, conf_data,
513 sizeof (struct dasd_eckd_confdata));
514 kfree(conf_data); /* allocated by read_conf_data() */
518 static struct dasd_ccw_req *
519 dasd_eckd_analysis_ccw(struct dasd_device *device)
521 struct dasd_eckd_private *private;
522 struct eckd_count *count_data;
523 struct LO_eckd_data *LO_data;
524 struct dasd_ccw_req *cqr;
526 int cplength, datasize;
529 private = (struct dasd_eckd_private *) device->private;
532 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
533 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
534 cplength, datasize, device);
538 /* Define extent for the first 3 tracks. */
539 define_extent(ccw++, cqr->data, 0, 2,
540 DASD_ECKD_CCW_READ_COUNT, device);
541 LO_data = cqr->data + sizeof (struct DE_eckd_data);
542 /* Locate record for the first 4 records on track 0. */
543 ccw[-1].flags |= CCW_FLAG_CC;
544 locate_record(ccw++, LO_data++, 0, 0, 4,
545 DASD_ECKD_CCW_READ_COUNT, device, 0);
547 count_data = private->count_area;
548 for (i = 0; i < 4; i++) {
549 ccw[-1].flags |= CCW_FLAG_CC;
550 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
553 ccw->cda = (__u32)(addr_t) count_data;
558 /* Locate record for the first record on track 2. */
559 ccw[-1].flags |= CCW_FLAG_CC;
560 locate_record(ccw++, LO_data++, 2, 0, 1,
561 DASD_ECKD_CCW_READ_COUNT, device, 0);
562 /* Read count ccw. */
563 ccw[-1].flags |= CCW_FLAG_CC;
564 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
567 ccw->cda = (__u32)(addr_t) count_data;
569 cqr->device = device;
571 cqr->buildclk = get_clock();
572 cqr->status = DASD_CQR_FILLED;
577 * This is the callback function for the init_analysis cqr. It saves
578 * the status of the initial analysis ccw before it frees it and kicks
579 * the device to continue the startup sequence. This will call
580 * dasd_eckd_do_analysis again (if the devices has not been marked
581 * for deletion in the meantime).
584 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
586 struct dasd_eckd_private *private;
587 struct dasd_device *device;
589 device = init_cqr->device;
590 private = (struct dasd_eckd_private *) device->private;
591 private->init_cqr_status = init_cqr->status;
592 dasd_sfree_request(init_cqr, device);
593 dasd_kick_device(device);
597 dasd_eckd_start_analysis(struct dasd_device *device)
599 struct dasd_eckd_private *private;
600 struct dasd_ccw_req *init_cqr;
602 private = (struct dasd_eckd_private *) device->private;
603 init_cqr = dasd_eckd_analysis_ccw(device);
604 if (IS_ERR(init_cqr))
605 return PTR_ERR(init_cqr);
606 init_cqr->callback = dasd_eckd_analysis_callback;
607 init_cqr->callback_data = NULL;
608 init_cqr->expires = 5*HZ;
609 dasd_add_request_head(init_cqr);
614 dasd_eckd_end_analysis(struct dasd_device *device)
616 struct dasd_eckd_private *private;
617 struct eckd_count *count_area;
618 unsigned int sb, blk_per_trk;
621 private = (struct dasd_eckd_private *) device->private;
622 status = private->init_cqr_status;
623 private->init_cqr_status = -1;
624 if (status != DASD_CQR_DONE) {
625 DEV_MESSAGE(KERN_WARNING, device, "%s",
626 "volume analysis returned unformatted disk");
630 private->uses_cdl = 1;
631 /* Calculate number of blocks/records per track. */
632 blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
633 /* Check Track 0 for Compatible Disk Layout */
635 for (i = 0; i < 3; i++) {
636 if (private->count_area[i].kl != 4 ||
637 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
638 private->uses_cdl = 0;
643 count_area = &private->count_area[4];
645 if (private->uses_cdl == 0) {
646 for (i = 0; i < 5; i++) {
647 if ((private->count_area[i].kl != 0) ||
648 (private->count_area[i].dl !=
649 private->count_area[0].dl))
653 count_area = &private->count_area[0];
655 if (private->count_area[3].record == 1)
656 DEV_MESSAGE(KERN_WARNING, device, "%s",
657 "Trk 0: no records after VTOC!");
659 if (count_area != NULL && count_area->kl == 0) {
660 /* we found notthing violating our disk layout */
661 if (dasd_check_blocksize(count_area->dl) == 0)
662 device->bp_block = count_area->dl;
664 if (device->bp_block == 0) {
665 DEV_MESSAGE(KERN_WARNING, device, "%s",
666 "Volume has incompatible disk layout");
669 device->s2b_shift = 0; /* bits to shift 512 to get a block */
670 for (sb = 512; sb < device->bp_block; sb = sb << 1)
673 blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
674 device->blocks = (private->rdc_data.no_cyl *
675 private->rdc_data.trk_per_cyl *
678 DEV_MESSAGE(KERN_INFO, device,
679 "(%dkB blks): %dkB at %dkB/trk %s",
680 (device->bp_block >> 10),
681 ((private->rdc_data.no_cyl *
682 private->rdc_data.trk_per_cyl *
683 blk_per_trk * (device->bp_block >> 9)) >> 1),
684 ((blk_per_trk * device->bp_block) >> 10),
686 "compatible disk layout" : "linux disk layout");
692 dasd_eckd_do_analysis(struct dasd_device *device)
694 struct dasd_eckd_private *private;
696 private = (struct dasd_eckd_private *) device->private;
697 if (private->init_cqr_status < 0)
698 return dasd_eckd_start_analysis(device);
700 return dasd_eckd_end_analysis(device);
704 dasd_eckd_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
706 struct dasd_eckd_private *private;
708 private = (struct dasd_eckd_private *) device->private;
709 if (dasd_check_blocksize(device->bp_block) == 0) {
710 geo->sectors = recs_per_track(&private->rdc_data,
711 0, device->bp_block);
713 geo->cylinders = private->rdc_data.no_cyl;
714 geo->heads = private->rdc_data.trk_per_cyl;
718 static struct dasd_ccw_req *
719 dasd_eckd_format_device(struct dasd_device * device,
720 struct format_data_t * fdata)
722 struct dasd_eckd_private *private;
723 struct dasd_ccw_req *fcp;
724 struct eckd_count *ect;
728 int cplength, datasize;
731 private = (struct dasd_eckd_private *) device->private;
732 rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
733 cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
734 head = fdata->start_unit % private->rdc_data.trk_per_cyl;
737 if (fdata->start_unit >=
738 (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
739 DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
741 return ERR_PTR(-EINVAL);
743 if (fdata->start_unit > fdata->stop_unit) {
744 DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
746 return ERR_PTR(-EINVAL);
748 if (dasd_check_blocksize(fdata->blksize) != 0) {
749 MESSAGE(KERN_WARNING, "Invalid blocksize %d...terminating!",
751 return ERR_PTR(-EINVAL);
755 * fdata->intensity is a bit string that tells us what to do:
756 * Bit 0: write record zero
757 * Bit 1: write home address, currently not supported
758 * Bit 2: invalidate tracks
759 * Bit 3: use OS/390 compatible disk layout (cdl)
760 * Only some bit combinations do make sense.
762 switch (fdata->intensity) {
763 case 0x00: /* Normal format */
764 case 0x08: /* Normal format, use cdl. */
766 datasize = sizeof(struct DE_eckd_data) +
767 sizeof(struct LO_eckd_data) +
768 rpt * sizeof(struct eckd_count);
770 case 0x01: /* Write record zero and format track. */
771 case 0x09: /* Write record zero and format track, use cdl. */
773 datasize = sizeof(struct DE_eckd_data) +
774 sizeof(struct LO_eckd_data) +
775 sizeof(struct eckd_count) +
776 rpt * sizeof(struct eckd_count);
778 case 0x04: /* Invalidate track. */
779 case 0x0c: /* Invalidate track, use cdl. */
781 datasize = sizeof(struct DE_eckd_data) +
782 sizeof(struct LO_eckd_data) +
783 sizeof(struct eckd_count);
786 MESSAGE(KERN_WARNING, "Invalid flags 0x%x.", fdata->intensity);
787 return ERR_PTR(-EINVAL);
789 /* Allocate the format ccw request. */
790 fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
791 cplength, datasize, device);
798 switch (fdata->intensity & ~0x08) {
799 case 0x00: /* Normal format. */
800 define_extent(ccw++, (struct DE_eckd_data *) data,
801 fdata->start_unit, fdata->start_unit,
802 DASD_ECKD_CCW_WRITE_CKD, device);
803 data += sizeof(struct DE_eckd_data);
804 ccw[-1].flags |= CCW_FLAG_CC;
805 locate_record(ccw++, (struct LO_eckd_data *) data,
806 fdata->start_unit, 0, rpt,
807 DASD_ECKD_CCW_WRITE_CKD, device,
809 data += sizeof(struct LO_eckd_data);
811 case 0x01: /* Write record zero + format track. */
812 define_extent(ccw++, (struct DE_eckd_data *) data,
813 fdata->start_unit, fdata->start_unit,
814 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
816 data += sizeof(struct DE_eckd_data);
817 ccw[-1].flags |= CCW_FLAG_CC;
818 locate_record(ccw++, (struct LO_eckd_data *) data,
819 fdata->start_unit, 0, rpt + 1,
820 DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
822 data += sizeof(struct LO_eckd_data);
824 case 0x04: /* Invalidate track. */
825 define_extent(ccw++, (struct DE_eckd_data *) data,
826 fdata->start_unit, fdata->start_unit,
827 DASD_ECKD_CCW_WRITE_CKD, device);
828 data += sizeof(struct DE_eckd_data);
829 ccw[-1].flags |= CCW_FLAG_CC;
830 locate_record(ccw++, (struct LO_eckd_data *) data,
831 fdata->start_unit, 0, 1,
832 DASD_ECKD_CCW_WRITE_CKD, device, 8);
833 data += sizeof(struct LO_eckd_data);
836 if (fdata->intensity & 0x01) { /* write record zero */
837 ect = (struct eckd_count *) data;
838 data += sizeof(struct eckd_count);
844 ccw[-1].flags |= CCW_FLAG_CC;
845 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
846 ccw->flags = CCW_FLAG_SLI;
848 ccw->cda = (__u32)(addr_t) ect;
851 if ((fdata->intensity & ~0x08) & 0x04) { /* erase track */
852 ect = (struct eckd_count *) data;
853 data += sizeof(struct eckd_count);
859 ccw[-1].flags |= CCW_FLAG_CC;
860 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
861 ccw->flags = CCW_FLAG_SLI;
863 ccw->cda = (__u32)(addr_t) ect;
864 } else { /* write remaining records */
865 for (i = 0; i < rpt; i++) {
866 ect = (struct eckd_count *) data;
867 data += sizeof(struct eckd_count);
872 ect->dl = fdata->blksize;
873 /* Check for special tracks 0-1 when formatting CDL */
874 if ((fdata->intensity & 0x08) &&
875 fdata->start_unit == 0) {
878 ect->dl = sizes_trk0[i] - 4;
881 if ((fdata->intensity & 0x08) &&
882 fdata->start_unit == 1) {
884 ect->dl = LABEL_SIZE - 44;
886 ccw[-1].flags |= CCW_FLAG_CC;
887 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
888 ccw->flags = CCW_FLAG_SLI;
890 ccw->cda = (__u32)(addr_t) ect;
894 fcp->device = device;
895 fcp->retries = 2; /* set retry counter to enable ERP */
896 fcp->buildclk = get_clock();
897 fcp->status = DASD_CQR_FILLED;
902 dasd_eckd_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
904 struct dasd_device *device = (struct dasd_device *) cqr->device;
905 struct ccw_device *cdev = device->cdev;
907 if (irb->scsw.cstat == 0x00 &&
908 irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
909 return dasd_era_none;
911 switch (cdev->id.cu_type) {
916 return dasd_3990_erp_examine(cqr, irb);
918 return dasd_9343_erp_examine(cqr, irb);
921 MESSAGE(KERN_WARNING, "%s",
922 "default (unknown CU type) - RECOVERABLE return");
923 return dasd_era_recover;
928 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
930 struct dasd_device *device = (struct dasd_device *) cqr->device;
931 struct ccw_device *cdev = device->cdev;
933 switch (cdev->id.cu_type) {
938 return dasd_3990_erp_action;
940 /* Return dasd_9343_erp_action; */
943 return dasd_default_erp_action;
948 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
950 return dasd_default_erp_postaction;
953 static struct dasd_ccw_req *
954 dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
956 struct dasd_eckd_private *private;
957 unsigned long *idaws;
958 struct LO_eckd_data *LO_data;
959 struct dasd_ccw_req *cqr;
964 unsigned int blksize, blk_per_trk, off;
965 int count, cidaw, cplength, datasize;
966 sector_t recid, first_rec, last_rec;
967 sector_t first_trk, last_trk;
968 unsigned int first_offs, last_offs;
969 unsigned char cmd, rcmd;
972 private = (struct dasd_eckd_private *) device->private;
973 if (rq_data_dir(req) == READ)
974 cmd = DASD_ECKD_CCW_READ_MT;
975 else if (rq_data_dir(req) == WRITE)
976 cmd = DASD_ECKD_CCW_WRITE_MT;
978 return ERR_PTR(-EINVAL);
979 /* Calculate number of blocks/records per track. */
980 blksize = device->bp_block;
981 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
982 /* Calculate record id of first and last block. */
983 first_rec = first_trk = req->sector >> device->s2b_shift;
984 first_offs = sector_div(first_trk, blk_per_trk);
985 last_rec = last_trk =
986 (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
987 last_offs = sector_div(last_trk, blk_per_trk);
988 /* Check struct bio and count the number of blocks for the request. */
991 rq_for_each_bio(bio, req) {
992 bio_for_each_segment(bv, bio, i) {
993 if (bv->bv_len & (blksize - 1))
994 /* Eckd can only do full blocks. */
995 return ERR_PTR(-EINVAL);
996 count += bv->bv_len >> (device->s2b_shift + 9);
997 #if defined(CONFIG_ARCH_S390X)
998 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
999 cidaw += bv->bv_len >> (device->s2b_shift + 9);
1004 if (count != last_rec - first_rec + 1)
1005 return ERR_PTR(-EINVAL);
1006 /* 1x define extent + 1x locate record + number of blocks */
1007 cplength = 2 + count;
1008 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1009 datasize = sizeof(struct DE_eckd_data) + sizeof(struct LO_eckd_data) +
1010 cidaw * sizeof(unsigned long);
1011 /* Find out the number of additional locate record ccws for cdl. */
1012 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1013 if (last_rec >= 2*blk_per_trk)
1014 count = 2*blk_per_trk - first_rec;
1016 datasize += count*sizeof(struct LO_eckd_data);
1018 /* Allocate the ccw request. */
1019 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1020 cplength, datasize, device);
1024 /* First ccw is define extent. */
1025 define_extent(ccw++, cqr->data, first_trk, last_trk, cmd, device);
1026 /* Build locate_record+read/write/ccws. */
1027 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_eckd_data));
1028 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1030 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1031 /* Only standard blocks so there is just one locate record. */
1032 ccw[-1].flags |= CCW_FLAG_CC;
1033 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1034 last_rec - recid + 1, cmd, device, blksize);
1036 rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
1037 dst = page_address(bv->bv_page) + bv->bv_offset;
1038 for (off = 0; off < bv->bv_len; off += blksize) {
1039 sector_t trkid = recid;
1040 unsigned int recoffs = sector_div(trkid, blk_per_trk);
1043 /* Locate record for cdl special block ? */
1044 if (private->uses_cdl && recid < 2*blk_per_trk) {
1045 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1047 count = dasd_eckd_cdl_reclen(recid);
1048 if (count < blksize)
1049 memset(dst + count, 0xe5,
1052 ccw[-1].flags |= CCW_FLAG_CC;
1053 locate_record(ccw++, LO_data++,
1055 1, rcmd, device, count);
1057 /* Locate record for standard blocks ? */
1058 if (private->uses_cdl && recid == 2*blk_per_trk) {
1059 ccw[-1].flags |= CCW_FLAG_CC;
1060 locate_record(ccw++, LO_data++,
1062 last_rec - recid + 1,
1063 cmd, device, count);
1065 /* Read/write ccw. */
1066 ccw[-1].flags |= CCW_FLAG_CC;
1067 ccw->cmd_code = rcmd;
1069 if (idal_is_needed(dst, blksize)) {
1070 ccw->cda = (__u32)(addr_t) idaws;
1071 ccw->flags = CCW_FLAG_IDA;
1072 idaws = idal_create_words(idaws, dst, blksize);
1074 ccw->cda = (__u32)(addr_t) dst;
1082 cqr->device = device;
1083 cqr->expires = 5 * 60 * HZ; /* 5 minutes */
1084 cqr->lpm = LPM_ANYPATH;
1086 cqr->buildclk = get_clock();
1087 cqr->status = DASD_CQR_FILLED;
1092 dasd_eckd_fill_info(struct dasd_device * device,
1093 struct dasd_information2_t * info)
1095 struct dasd_eckd_private *private;
1097 private = (struct dasd_eckd_private *) device->private;
1098 info->label_block = 2;
1099 info->FBA_layout = private->uses_cdl ? 0 : 1;
1100 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
1101 info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
1102 memcpy(info->characteristics, &private->rdc_data,
1103 sizeof(struct dasd_eckd_characteristics));
1104 info->confdata_size = sizeof (struct dasd_eckd_confdata);
1105 memcpy(info->configuration_data, &private->conf_data,
1106 sizeof (struct dasd_eckd_confdata));
1111 * SECTION: ioctl functions for eckd devices.
1115 * Release device ioctl.
1116 * Buils a channel programm to releases a prior reserved
1117 * (see dasd_eckd_reserve) device.
1120 dasd_eckd_release(struct block_device *bdev, int no, long args)
1122 struct dasd_device *device;
1123 struct dasd_ccw_req *cqr;
1126 if (!capable(CAP_SYS_ADMIN))
1129 device = bdev->bd_disk->private_data;
1133 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1136 MESSAGE(KERN_WARNING, "%s",
1137 "No memory to allocate initialization request");
1140 cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
1141 cqr->cpaddr->flags |= CCW_FLAG_SLI;
1142 cqr->cpaddr->count = 32;
1143 cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1144 cqr->device = device;
1145 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1147 cqr->expires = 2 * HZ;
1148 cqr->buildclk = get_clock();
1149 cqr->status = DASD_CQR_FILLED;
1151 rc = dasd_sleep_on_immediatly(cqr);
1153 dasd_sfree_request(cqr, cqr->device);
1158 * Reserve device ioctl.
1159 * Options are set to 'synchronous wait for interrupt' and
1160 * 'timeout the request'. This leads to a terminate IO if
1161 * the interrupt is outstanding for a certain time.
1164 dasd_eckd_reserve(struct block_device *bdev, int no, long args)
1166 struct dasd_device *device;
1167 struct dasd_ccw_req *cqr;
1170 if (!capable(CAP_SYS_ADMIN))
1173 device = bdev->bd_disk->private_data;
1177 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1180 MESSAGE(KERN_WARNING, "%s",
1181 "No memory to allocate initialization request");
1184 cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
1185 cqr->cpaddr->flags |= CCW_FLAG_SLI;
1186 cqr->cpaddr->count = 32;
1187 cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1188 cqr->device = device;
1189 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1191 cqr->expires = 2 * HZ;
1192 cqr->buildclk = get_clock();
1193 cqr->status = DASD_CQR_FILLED;
1195 rc = dasd_sleep_on_immediatly(cqr);
1197 dasd_sfree_request(cqr, cqr->device);
1202 * Steal lock ioctl - unconditional reserve device.
1203 * Buils a channel programm to break a device's reservation.
1204 * (unconditional reserve)
1207 dasd_eckd_steal_lock(struct block_device *bdev, int no, long args)
1209 struct dasd_device *device;
1210 struct dasd_ccw_req *cqr;
1213 if (!capable(CAP_SYS_ADMIN))
1216 device = bdev->bd_disk->private_data;
1220 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1223 MESSAGE(KERN_WARNING, "%s",
1224 "No memory to allocate initialization request");
1227 cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
1228 cqr->cpaddr->flags |= CCW_FLAG_SLI;
1229 cqr->cpaddr->count = 32;
1230 cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1231 cqr->device = device;
1232 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1234 cqr->expires = 2 * HZ;
1235 cqr->buildclk = get_clock();
1236 cqr->status = DASD_CQR_FILLED;
1238 rc = dasd_sleep_on_immediatly(cqr);
1240 dasd_sfree_request(cqr, cqr->device);
1245 * Read performance statistics
1248 dasd_eckd_performance(struct block_device *bdev, int no, long args)
1250 struct dasd_device *device;
1251 struct dasd_psf_prssd_data *prssdp;
1252 struct dasd_rssd_perf_stats_t *stats;
1253 struct dasd_ccw_req *cqr;
1257 device = bdev->bd_disk->private_data;
1261 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1262 1 /* PSF */ + 1 /* RSSD */ ,
1263 (sizeof (struct dasd_psf_prssd_data) +
1264 sizeof (struct dasd_rssd_perf_stats_t)),
1267 MESSAGE(KERN_WARNING, "%s",
1268 "No memory to allocate initialization request");
1271 cqr->device = device;
1273 cqr->expires = 10 * HZ;
1275 /* Prepare for Read Subsystem Data */
1276 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1277 memset(prssdp, 0, sizeof (struct dasd_psf_prssd_data));
1278 prssdp->order = PSF_ORDER_PRSSD;
1279 prssdp->suborder = 0x01; /* Perfomance Statistics */
1280 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
1283 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1284 ccw->count = sizeof (struct dasd_psf_prssd_data);
1285 ccw->flags |= CCW_FLAG_CC;
1286 ccw->cda = (__u32)(addr_t) prssdp;
1288 /* Read Subsystem Data - Performance Statistics */
1289 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1290 memset(stats, 0, sizeof (struct dasd_rssd_perf_stats_t));
1293 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1294 ccw->count = sizeof (struct dasd_rssd_perf_stats_t);
1295 ccw->cda = (__u32)(addr_t) stats;
1297 cqr->buildclk = get_clock();
1298 cqr->status = DASD_CQR_FILLED;
1299 rc = dasd_sleep_on(cqr);
1301 /* Prepare for Read Subsystem Data */
1302 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1303 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1304 rc = copy_to_user((long __user *) args, (long *) stats,
1305 sizeof(struct dasd_rssd_perf_stats_t));
1307 dasd_sfree_request(cqr, cqr->device);
1312 * Get attributes (cache operations)
1313 * Returnes the cache attributes used in Define Extend (DE).
1316 dasd_eckd_get_attrib (struct block_device *bdev, int no, long args)
1318 struct dasd_device *device;
1319 struct dasd_eckd_private *private;
1320 struct attrib_data_t attrib;
1323 if (!capable(CAP_SYS_ADMIN))
1328 device = bdev->bd_disk->private_data;
1332 private = (struct dasd_eckd_private *) device->private;
1333 attrib = private->attrib;
1335 rc = copy_to_user((long __user *) args, (long *) &attrib,
1336 sizeof (struct attrib_data_t));
1342 * Set attributes (cache operations)
1343 * Stores the attributes for cache operation to be used in Define Extend (DE).
1346 dasd_eckd_set_attrib(struct block_device *bdev, int no, long args)
1348 struct dasd_device *device;
1349 struct dasd_eckd_private *private;
1350 struct attrib_data_t attrib;
1352 if (!capable(CAP_SYS_ADMIN))
1357 device = bdev->bd_disk->private_data;
1361 if (copy_from_user(&attrib, (void __user *) args,
1362 sizeof (struct attrib_data_t))) {
1366 private = (struct dasd_eckd_private *) device->private;
1368 private->attrib = attrib;
1370 DBF_DEV_EVENT(DBF_ERR, device,
1371 "cache operation mode set to "
1372 "%x (%i cylinder prestage)",
1373 private->attrib.operation, private->attrib.nr_cyl);
1379 dasd_eckd_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
1387 page = (char *) get_zeroed_page(GFP_ATOMIC);
1389 MESSAGE(KERN_ERR, "%s", "No memory to dump sense data");
1392 len = sprintf(page, KERN_ERR PRINTK_HEADER
1393 "device %s: I/O status report:\n",
1394 device->cdev->dev.bus_id);
1395 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1396 "in req: %p CS: 0x%02X DS: 0x%02X\n", req,
1397 irb->scsw.cstat, irb->scsw.dstat);
1398 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1399 "Failing CCW: %p\n",
1400 (void *) (addr_t) irb->scsw.cpa);
1404 "CCW %p: %08X %08X",
1405 act, ((int *) act)[0], ((int *) act)[1]);
1407 "DAT: %08X %08X %08X %08X",
1408 ((int *) (addr_t) act->cda)[0],
1409 ((int *) (addr_t) act->cda)[1],
1410 ((int *) (addr_t) act->cda)[2],
1411 ((int *) (addr_t) act->cda)[3]);
1412 } while (act++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
1413 if (irb->esw.esw0.erw.cons) {
1414 for (sl = 0; sl < 4; sl++) {
1415 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1416 "Sense(hex) %2d-%2d:",
1417 (8 * sl), ((8 * sl) + 7));
1419 for (sct = 0; sct < 8; sct++) {
1420 len += sprintf(page + len, " %02x",
1421 irb->ecw[8 * sl + sct]);
1423 len += sprintf(page + len, "\n");
1426 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
1427 /* 24 Byte Sense Data */
1428 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1429 "24 Byte: %x MSG %x, %s MSGb to SYSOP\n",
1430 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
1431 irb->ecw[1] & 0x10 ? "" : "no");
1433 /* 32 Byte Sense Data */
1434 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1435 "32 Byte: Format: %x "
1436 "Exception class %x\n",
1437 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
1440 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1441 "SORRY - NO VALID SENSE AVAILABLE\n");
1444 MESSAGE(KERN_ERR, "Sense data:\n%s", page);
1446 free_page((unsigned long) page);
1450 * max_blocks is dependent on the amount of storage that is available
1451 * in the static io buffer for each device. Currently each device has
1452 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
1453 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
1454 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
1455 * addition we have one define extent ccw + 16 bytes of data and one
1456 * locate record ccw + 16 bytes of data. That makes:
1457 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
1458 * We want to fit two into the available memory so that we can immediately
1459 * start the next request if one finishes off. That makes 249.5 blocks
1460 * for one request. Give a little safety and the result is 240.
1462 static struct dasd_discipline dasd_eckd_discipline = {
1463 .owner = THIS_MODULE,
1467 .check_device = dasd_eckd_check_characteristics,
1468 .do_analysis = dasd_eckd_do_analysis,
1469 .fill_geometry = dasd_eckd_fill_geometry,
1470 .start_IO = dasd_start_IO,
1471 .term_IO = dasd_term_IO,
1472 .format_device = dasd_eckd_format_device,
1473 .examine_error = dasd_eckd_examine_error,
1474 .erp_action = dasd_eckd_erp_action,
1475 .erp_postaction = dasd_eckd_erp_postaction,
1476 .build_cp = dasd_eckd_build_cp,
1477 .dump_sense = dasd_eckd_dump_sense,
1478 .fill_info = dasd_eckd_fill_info,
1482 dasd_eckd_init(void)
1486 dasd_ioctl_no_register(THIS_MODULE, BIODASDGATTR,
1487 dasd_eckd_get_attrib);
1488 dasd_ioctl_no_register(THIS_MODULE, BIODASDSATTR,
1489 dasd_eckd_set_attrib);
1490 dasd_ioctl_no_register(THIS_MODULE, BIODASDPSRD,
1491 dasd_eckd_performance);
1492 dasd_ioctl_no_register(THIS_MODULE, BIODASDRLSE,
1494 dasd_ioctl_no_register(THIS_MODULE, BIODASDRSRV,
1496 dasd_ioctl_no_register(THIS_MODULE, BIODASDSLCK,
1497 dasd_eckd_steal_lock);
1499 ASCEBC(dasd_eckd_discipline.ebcname, 4);
1501 ret = ccw_driver_register(&dasd_eckd_driver);
1503 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDGATTR,
1504 dasd_eckd_get_attrib);
1505 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDSATTR,
1506 dasd_eckd_set_attrib);
1507 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDPSRD,
1508 dasd_eckd_performance);
1509 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDRLSE,
1511 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDRSRV,
1513 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDSLCK,
1514 dasd_eckd_steal_lock);
1518 dasd_generic_auto_online(&dasd_eckd_driver);
1523 dasd_eckd_cleanup(void)
1525 ccw_driver_unregister(&dasd_eckd_driver);
1527 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDGATTR,
1528 dasd_eckd_get_attrib);
1529 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDSATTR,
1530 dasd_eckd_set_attrib);
1531 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDPSRD,
1532 dasd_eckd_performance);
1533 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDRLSE,
1535 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDRSRV,
1537 dasd_ioctl_no_unregister(THIS_MODULE, BIODASDSLCK,
1538 dasd_eckd_steal_lock);
1541 module_init(dasd_eckd_init);
1542 module_exit(dasd_eckd_cleanup);
1545 * Overrides for Emacs so that we follow Linus's tabbing style.
1546 * Emacs will notice this stuff at the end of the file and automatically
1547 * adjust the settings for this buffer only. This must remain at the end
1549 * ---------------------------------------------------------------------------
1552 * c-brace-imaginary-offset: 0
1553 * c-brace-offset: -4
1554 * c-argdecl-indent: 4
1555 * c-label-offset: -4
1556 * c-continued-statement-offset: 4
1557 * c-continued-brace-offset: 0
1558 * indent-tabs-mode: 1