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[PATCH] s390: add read_mostly optimization
[linux-2.6-block.git] / drivers / s390 / block / dasd_eckd.c
CommitLineData
1da177e4
LT		 1/*
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
9 *
1da177e4
LT		 10 */
11
12#include <linux/config.h>
13#include <linux/stddef.h>
14#include <linux/kernel.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>
20
21#include <asm/debug.h>
22#include <asm/idals.h>
23#include <asm/ebcdic.h>
24#include <asm/io.h>
25#include <asm/todclk.h>
26#include <asm/uaccess.h>
27#include <asm/ccwdev.h>
28
29#include "dasd_int.h"
30#include "dasd_eckd.h"
31
32#ifdef PRINTK_HEADER
33#undef PRINTK_HEADER
34#endif /* PRINTK_HEADER */
35#define PRINTK_HEADER "dasd(eckd):"
36
37#define ECKD_C0(i) (i->home_bytes)
38#define ECKD_F(i) (i->formula)
39#define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
40 (i->factors.f_0x02.f1))
41#define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
42 (i->factors.f_0x02.f2))
43#define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
44 (i->factors.f_0x02.f3))
45#define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
46#define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
47#define ECKD_F6(i) (i->factor6)
48#define ECKD_F7(i) (i->factor7)
49#define ECKD_F8(i) (i->factor8)
50
51MODULE_LICENSE("GPL");
52
53static struct dasd_discipline dasd_eckd_discipline;
54
55struct dasd_eckd_private {
56 struct dasd_eckd_characteristics rdc_data;
57 struct dasd_eckd_confdata conf_data;
58 struct dasd_eckd_path path_data;
59 struct eckd_count count_area[5];
60 int init_cqr_status;
61 int uses_cdl;
62 struct attrib_data_t attrib; /* e.g. cache operations */
63};
64
65/* The ccw bus type uses this table to find devices that it sends to
66 * dasd_eckd_probe */
67static struct ccw_device_id dasd_eckd_ids[] = {
68 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), driver_info: 0x1},
69 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), driver_info: 0x2},
70 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3390, 0), driver_info: 0x3},
71 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), driver_info: 0x4},
72 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), driver_info: 0x5},
73 { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), driver_info: 0x6},
74 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), driver_info: 0x7},
75 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), driver_info: 0x8},
76 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), driver_info: 0x9},
77 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), driver_info: 0xa},
78 { /* end of list */ },
79};
80
81MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
82
83static struct ccw_driver dasd_eckd_driver; /* see below */
84
85/* initial attempt at a probe function. this can be simplified once
86 * the other detection code is gone */
87static int
88dasd_eckd_probe (struct ccw_device *cdev)
89{
90 int ret;
91
92 ret = dasd_generic_probe (cdev, &dasd_eckd_discipline);
93 if (ret)
94 return ret;
95 ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP | CCWDEV_ALLOW_FORCE);
96 return 0;
97}
98
99static int
100dasd_eckd_set_online(struct ccw_device *cdev)
101{
102 return dasd_generic_set_online (cdev, &dasd_eckd_discipline);
103}
104
105static struct ccw_driver dasd_eckd_driver = {
106 .name = "dasd-eckd",
107 .owner = THIS_MODULE,
108 .ids = dasd_eckd_ids,
109 .probe = dasd_eckd_probe,
110 .remove = dasd_generic_remove,
111 .set_offline = dasd_generic_set_offline,
112 .set_online = dasd_eckd_set_online,
113 .notify = dasd_generic_notify,
114};
115
116static const int sizes_trk0[] = { 28, 148, 84 };
117#define LABEL_SIZE 140
118
119static inline unsigned int
120round_up_multiple(unsigned int no, unsigned int mult)
121{
122 int rem = no % mult;
123 return (rem ? no - rem + mult : no);
124}
125
126static inline unsigned int
127ceil_quot(unsigned int d1, unsigned int d2)
128{
129 return (d1 + (d2 - 1)) / d2;
130}
131
132static inline int
133bytes_per_record(struct dasd_eckd_characteristics *rdc, int kl, int dl)
134{
135 unsigned int fl1, fl2, int1, int2;
136 int bpr;
137
138 switch (rdc->formula) {
139 case 0x01:
140 fl1 = round_up_multiple(ECKD_F2(rdc) + dl, ECKD_F1(rdc));
141 fl2 = round_up_multiple(kl ? ECKD_F2(rdc) + kl : 0,
142 ECKD_F1(rdc));
143 bpr = fl1 + fl2;
144 break;
145 case 0x02:
146 int1 = ceil_quot(dl + ECKD_F6(rdc), ECKD_F5(rdc) << 1);
147 int2 = ceil_quot(kl + ECKD_F6(rdc), ECKD_F5(rdc) << 1);
148 fl1 = round_up_multiple(ECKD_F1(rdc) * ECKD_F2(rdc) + dl +
149 ECKD_F6(rdc) + ECKD_F4(rdc) * int1,
150 ECKD_F1(rdc));
151 fl2 = round_up_multiple(ECKD_F1(rdc) * ECKD_F3(rdc) + kl +
152 ECKD_F6(rdc) + ECKD_F4(rdc) * int2,
153 ECKD_F1(rdc));
154 bpr = fl1 + fl2;
155 break;
156 default:
157 bpr = 0;
158 break;
159 }
160 return bpr;
161}
162
163static inline unsigned int
164bytes_per_track(struct dasd_eckd_characteristics *rdc)
165{
166 return *(unsigned int *) (rdc->byte_per_track) >> 8;
167}
168
169static inline unsigned int
170recs_per_track(struct dasd_eckd_characteristics * rdc,
171 unsigned int kl, unsigned int dl)
172{
173 int dn, kn;
174
175 switch (rdc->dev_type) {
176 case 0x3380:
177 if (kl)
178 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
179 ceil_quot(dl + 12, 32));
180 else
181 return 1499 / (15 + ceil_quot(dl + 12, 32));
182 case 0x3390:
183 dn = ceil_quot(dl + 6, 232) + 1;
184 if (kl) {
185 kn = ceil_quot(kl + 6, 232) + 1;
186 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
187 9 + ceil_quot(dl + 6 * dn, 34));
188 } else
189 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
190 case 0x9345:
191 dn = ceil_quot(dl + 6, 232) + 1;
192 if (kl) {
193 kn = ceil_quot(kl + 6, 232) + 1;
194 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
195 ceil_quot(dl + 6 * dn, 34));
196 } else
197 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
198 }
199 return 0;
200}
201
202static inline void
203check_XRC (struct ccw1 *de_ccw,
204 struct DE_eckd_data *data,
205 struct dasd_device *device)
206{
207 struct dasd_eckd_private *private;
208
209 private = (struct dasd_eckd_private *) device->private;
210
211 /* switch on System Time Stamp - needed for XRC Support */
212 if (private->rdc_data.facilities.XRC_supported) {
213
214 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
215 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
216
217 data->ep_sys_time = get_clock ();
218
219 de_ccw->count = sizeof (struct DE_eckd_data);
220 de_ccw->flags |= CCW_FLAG_SLI;
221 }
222
223 return;
224
225} /* end check_XRC */
226
227static inline void
228define_extent(struct ccw1 * ccw, struct DE_eckd_data * data, int trk,
229 int totrk, int cmd, struct dasd_device * device)
230{
231 struct dasd_eckd_private *private;
232 struct ch_t geo, beg, end;
233
234 private = (struct dasd_eckd_private *) device->private;
235
236 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
237 ccw->flags = 0;
238 ccw->count = 16;
239 ccw->cda = (__u32) __pa(data);
240
241 memset(data, 0, sizeof (struct DE_eckd_data));
242 switch (cmd) {
243 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
244 case DASD_ECKD_CCW_READ_RECORD_ZERO:
245 case DASD_ECKD_CCW_READ:
246 case DASD_ECKD_CCW_READ_MT:
247 case DASD_ECKD_CCW_READ_CKD:
248 case DASD_ECKD_CCW_READ_CKD_MT:
249 case DASD_ECKD_CCW_READ_KD:
250 case DASD_ECKD_CCW_READ_KD_MT:
251 case DASD_ECKD_CCW_READ_COUNT:
252 data->mask.perm = 0x1;
253 data->attributes.operation = private->attrib.operation;
254 break;
255 case DASD_ECKD_CCW_WRITE:
256 case DASD_ECKD_CCW_WRITE_MT:
257 case DASD_ECKD_CCW_WRITE_KD:
258 case DASD_ECKD_CCW_WRITE_KD_MT:
259 data->mask.perm = 0x02;
260 data->attributes.operation = private->attrib.operation;
261 check_XRC (ccw, data, device);
262 break;
263 case DASD_ECKD_CCW_WRITE_CKD:
264 case DASD_ECKD_CCW_WRITE_CKD_MT:
265 data->attributes.operation = DASD_BYPASS_CACHE;
266 check_XRC (ccw, data, device);
267 break;
268 case DASD_ECKD_CCW_ERASE:
269 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
270 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
271 data->mask.perm = 0x3;
272 data->mask.auth = 0x1;
273 data->attributes.operation = DASD_BYPASS_CACHE;
274 check_XRC (ccw, data, device);
275 break;
276 default:
277 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
278 break;
279 }
280
281 data->attributes.mode = 0x3; /* ECKD */
282
283 if ((private->rdc_data.cu_type == 0x2105 ||
284 private->rdc_data.cu_type == 0x2107 ||
285 private->rdc_data.cu_type == 0x1750)
286 && !(private->uses_cdl && trk < 2))
287 data->ga_extended |= 0x40; /* Regular Data Format Mode */
288
289 geo.cyl = private->rdc_data.no_cyl;
290 geo.head = private->rdc_data.trk_per_cyl;
291 beg.cyl = trk / geo.head;
292 beg.head = trk % geo.head;
293 end.cyl = totrk / geo.head;
294 end.head = totrk % geo.head;
295
296 /* check for sequential prestage - enhance cylinder range */
297 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
298 data->attributes.operation == DASD_SEQ_ACCESS) {
299
300 if (end.cyl + private->attrib.nr_cyl < geo.cyl)
301 end.cyl += private->attrib.nr_cyl;
302 else
303 end.cyl = (geo.cyl - 1);
304 }
305
306 data->beg_ext.cyl = beg.cyl;
307 data->beg_ext.head = beg.head;
308 data->end_ext.cyl = end.cyl;
309 data->end_ext.head = end.head;
310}
311
312static inline void
313locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk,
314 int rec_on_trk, int no_rec, int cmd,
315 struct dasd_device * device, int reclen)
316{
317 struct dasd_eckd_private *private;
318 int sector;
319 int dn, d;
320
321 private = (struct dasd_eckd_private *) device->private;
322
323 DBF_DEV_EVENT(DBF_INFO, device,
324 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
325 trk, rec_on_trk, no_rec, cmd, reclen);
326
327 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
328 ccw->flags = 0;
329 ccw->count = 16;
330 ccw->cda = (__u32) __pa(data);
331
332 memset(data, 0, sizeof (struct LO_eckd_data));
333 sector = 0;
334 if (rec_on_trk) {
335 switch (private->rdc_data.dev_type) {
336 case 0x3390:
337 dn = ceil_quot(reclen + 6, 232);
338 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
339 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
340 break;
341 case 0x3380:
342 d = 7 + ceil_quot(reclen + 12, 32);
343 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
344 break;
345 }
346 }
347 data->sector = sector;
348 data->count = no_rec;
349 switch (cmd) {
350 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
351 data->operation.orientation = 0x3;
352 data->operation.operation = 0x03;
353 break;
354 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
355 data->operation.orientation = 0x3;
356 data->operation.operation = 0x16;
357 break;
358 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
359 data->operation.orientation = 0x1;
360 data->operation.operation = 0x03;
361 data->count++;
362 break;
363 case DASD_ECKD_CCW_READ_RECORD_ZERO:
364 data->operation.orientation = 0x3;
365 data->operation.operation = 0x16;
366 data->count++;
367 break;
368 case DASD_ECKD_CCW_WRITE:
369 case DASD_ECKD_CCW_WRITE_MT:
370 case DASD_ECKD_CCW_WRITE_KD:
371 case DASD_ECKD_CCW_WRITE_KD_MT:
372 data->auxiliary.last_bytes_used = 0x1;
373 data->length = reclen;
374 data->operation.operation = 0x01;
375 break;
376 case DASD_ECKD_CCW_WRITE_CKD:
377 case DASD_ECKD_CCW_WRITE_CKD_MT:
378 data->auxiliary.last_bytes_used = 0x1;
379 data->length = reclen;
380 data->operation.operation = 0x03;
381 break;
382 case DASD_ECKD_CCW_READ:
383 case DASD_ECKD_CCW_READ_MT:
384 case DASD_ECKD_CCW_READ_KD:
385 case DASD_ECKD_CCW_READ_KD_MT:
386 data->auxiliary.last_bytes_used = 0x1;
387 data->length = reclen;
388 data->operation.operation = 0x06;
389 break;
390 case DASD_ECKD_CCW_READ_CKD:
391 case DASD_ECKD_CCW_READ_CKD_MT:
392 data->auxiliary.last_bytes_used = 0x1;
393 data->length = reclen;
394 data->operation.operation = 0x16;
395 break;
396 case DASD_ECKD_CCW_READ_COUNT:
397 data->operation.operation = 0x06;
398 break;
399 case DASD_ECKD_CCW_ERASE:
400 data->length = reclen;
401 data->auxiliary.last_bytes_used = 0x1;
402 data->operation.operation = 0x0b;
403 break;
404 default:
405 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
406 }
407 data->seek_addr.cyl = data->search_arg.cyl =
408 trk / private->rdc_data.trk_per_cyl;
409 data->seek_addr.head = data->search_arg.head =
410 trk % private->rdc_data.trk_per_cyl;
411 data->search_arg.record = rec_on_trk;
412}
413
414/*
415 * Returns 1 if the block is one of the special blocks that needs
416 * to get read/written with the KD variant of the command.
417 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
418 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
419 * Luckily the KD variants differ only by one bit (0x08) from the
420 * normal variant. So don't wonder about code like:
421 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
422 * ccw->cmd_code |= 0x8;
423 */
424static inline int
425dasd_eckd_cdl_special(int blk_per_trk, int recid)
426{
427 if (recid < 3)
428 return 1;
429 if (recid < blk_per_trk)
430 return 0;
431 if (recid < 2 * blk_per_trk)
432 return 1;
433 return 0;
434}
435
436/*
437 * Returns the record size for the special blocks of the cdl format.
438 * Only returns something useful if dasd_eckd_cdl_special is true
439 * for the recid.
440 */
441static inline int
442dasd_eckd_cdl_reclen(int recid)
443{
444 if (recid < 3)
445 return sizes_trk0[recid];
446 return LABEL_SIZE;
447}
448
449static int
450dasd_eckd_read_conf(struct dasd_device *device)
451{
452 void *conf_data;
453 int conf_len, conf_data_saved;
454 int rc;
455 __u8 lpm;
456 struct dasd_eckd_private *private;
457 struct dasd_eckd_path *path_data;
458
459 private = (struct dasd_eckd_private *) device->private;
460 path_data = (struct dasd_eckd_path *) &private->path_data;
461 path_data->opm = ccw_device_get_path_mask(device->cdev);
462 lpm = 0x80;
463 conf_data_saved = 0;
464
465 /* get configuration data per operational path */
466 for (lpm = 0x80; lpm; lpm>>= 1) {
467 if (lpm & path_data->opm){
468 rc = read_conf_data_lpm(device->cdev, &conf_data,
469 &conf_len, lpm);
470 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
471 MESSAGE(KERN_WARNING,
472 "Read configuration data returned "
473 "error %d", rc);
474 return rc;
475 }
476 if (conf_data == NULL) {
477 MESSAGE(KERN_WARNING, "%s", "No configuration "
478 "data retrieved");
479 continue; /* no errror */
480 }
481 if (conf_len != sizeof (struct dasd_eckd_confdata)) {
482 MESSAGE(KERN_WARNING,
483 "sizes of configuration data mismatch"
484 "%d (read) vs %ld (expected)",
485 conf_len,
486 sizeof (struct dasd_eckd_confdata));
487 kfree(conf_data);
488 continue; /* no errror */
489 }
490 /* save first valid configuration data */
491 if (!conf_data_saved){
492 memcpy(&private->conf_data, conf_data,
493 sizeof (struct dasd_eckd_confdata));
494 conf_data_saved++;
495 }
496 switch (((char *)conf_data)[242] & 0x07){
497 case 0x02:
498 path_data->npm |= lpm;
499 break;
500 case 0x03:
501 path_data->ppm |= lpm;
502 break;
503 }
504 kfree(conf_data);
505 }
506 }
507 return 0;
508}
509
510
511static int
512dasd_eckd_check_characteristics(struct dasd_device *device)
513{
514 struct dasd_eckd_private *private;
515 void *rdc_data;
516 int rc;
517
518 private = (struct dasd_eckd_private *) device->private;
519 if (private == NULL) {
520 private = kmalloc(sizeof(struct dasd_eckd_private),
521 GFP_KERNEL | GFP_DMA);
522 if (private == NULL) {
523 DEV_MESSAGE(KERN_WARNING, device, "%s",
524 "memory allocation failed for private "
525 "data");
526 return -ENOMEM;
527 }
528 memset(private, 0, sizeof(struct dasd_eckd_private));
529 device->private = (void *) private;
530 }
531 /* Invalidate status of initial analysis. */
532 private->init_cqr_status = -1;
533 /* Set default cache operations. */
534 private->attrib.operation = DASD_NORMAL_CACHE;
535 private->attrib.nr_cyl = 0;
536
537 /* Read Device Characteristics */
538 rdc_data = (void *) &(private->rdc_data);
539 rc = read_dev_chars(device->cdev, &rdc_data, 64);
540 if (rc) {
541 DEV_MESSAGE(KERN_WARNING, device,
542 "Read device characteristics returned error %d",
543 rc);
544 return rc;
545 }
546
547 DEV_MESSAGE(KERN_INFO, device,
548 "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
549 private->rdc_data.dev_type,
550 private->rdc_data.dev_model,
551 private->rdc_data.cu_type,
552 private->rdc_data.cu_model.model,
553 private->rdc_data.no_cyl,
554 private->rdc_data.trk_per_cyl,
555 private->rdc_data.sec_per_trk);
556
557 /* Read Configuration Data */
558 rc = dasd_eckd_read_conf (device);
559 return rc;
560
561}
562
563static struct dasd_ccw_req *
564dasd_eckd_analysis_ccw(struct dasd_device *device)
565{
566 struct dasd_eckd_private *private;
567 struct eckd_count *count_data;
568 struct LO_eckd_data *LO_data;
569 struct dasd_ccw_req *cqr;
570 struct ccw1 *ccw;
571 int cplength, datasize;
572 int i;
573
574 private = (struct dasd_eckd_private *) device->private;
575
576 cplength = 8;
577 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
578 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
579 cplength, datasize, device);
580 if (IS_ERR(cqr))
581 return cqr;
582 ccw = cqr->cpaddr;
583 /* Define extent for the first 3 tracks. */
584 define_extent(ccw++, cqr->data, 0, 2,
585 DASD_ECKD_CCW_READ_COUNT, device);
586 LO_data = cqr->data + sizeof (struct DE_eckd_data);
587 /* Locate record for the first 4 records on track 0. */
588 ccw[-1].flags |= CCW_FLAG_CC;
589 locate_record(ccw++, LO_data++, 0, 0, 4,
590 DASD_ECKD_CCW_READ_COUNT, device, 0);
591
592 count_data = private->count_area;
593 for (i = 0; i < 4; i++) {
594 ccw[-1].flags |= CCW_FLAG_CC;
595 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
596 ccw->flags = 0;
597 ccw->count = 8;
598 ccw->cda = (__u32)(addr_t) count_data;
599 ccw++;
600 count_data++;
601 }
602
603 /* Locate record for the first record on track 2. */
604 ccw[-1].flags |= CCW_FLAG_CC;
605 locate_record(ccw++, LO_data++, 2, 0, 1,
606 DASD_ECKD_CCW_READ_COUNT, device, 0);
607 /* Read count ccw. */
608 ccw[-1].flags |= CCW_FLAG_CC;
609 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
610 ccw->flags = 0;
611 ccw->count = 8;
612 ccw->cda = (__u32)(addr_t) count_data;
613
614 cqr->device = device;
615 cqr->retries = 0;
616 cqr->buildclk = get_clock();
617 cqr->status = DASD_CQR_FILLED;
618 return cqr;
619}
620
621/*
622 * This is the callback function for the init_analysis cqr. It saves
623 * the status of the initial analysis ccw before it frees it and kicks
624 * the device to continue the startup sequence. This will call
625 * dasd_eckd_do_analysis again (if the devices has not been marked
626 * for deletion in the meantime).
627 */
628static void
629dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
630{
631 struct dasd_eckd_private *private;
632 struct dasd_device *device;
633
634 device = init_cqr->device;
635 private = (struct dasd_eckd_private *) device->private;
636 private->init_cqr_status = init_cqr->status;
637 dasd_sfree_request(init_cqr, device);
638 dasd_kick_device(device);
639}
640
641static int
642dasd_eckd_start_analysis(struct dasd_device *device)
643{
644 struct dasd_eckd_private *private;
645 struct dasd_ccw_req *init_cqr;
646
647 private = (struct dasd_eckd_private *) device->private;
648 init_cqr = dasd_eckd_analysis_ccw(device);
649 if (IS_ERR(init_cqr))
650 return PTR_ERR(init_cqr);
651 init_cqr->callback = dasd_eckd_analysis_callback;
652 init_cqr->callback_data = NULL;
653 init_cqr->expires = 5*HZ;
654 dasd_add_request_head(init_cqr);
655 return -EAGAIN;
656}
657
658static int
659dasd_eckd_end_analysis(struct dasd_device *device)
660{
661 struct dasd_eckd_private *private;
662 struct eckd_count *count_area;
663 unsigned int sb, blk_per_trk;
664 int status, i;
665
666 private = (struct dasd_eckd_private *) device->private;
667 status = private->init_cqr_status;
668 private->init_cqr_status = -1;
669 if (status != DASD_CQR_DONE) {
670 DEV_MESSAGE(KERN_WARNING, device, "%s",
671 "volume analysis returned unformatted disk");
672 return -EMEDIUMTYPE;
673 }
674
675 private->uses_cdl = 1;
676 /* Calculate number of blocks/records per track. */
677 blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
678 /* Check Track 0 for Compatible Disk Layout */
679 count_area = NULL;
680 for (i = 0; i < 3; i++) {
681 if (private->count_area[i].kl != 4 ||
682 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
683 private->uses_cdl = 0;
684 break;
685 }
686 }
687 if (i == 3)
688 count_area = &private->count_area[4];
689
690 if (private->uses_cdl == 0) {
691 for (i = 0; i < 5; i++) {
692 if ((private->count_area[i].kl != 0) ||
693 (private->count_area[i].dl !=
694 private->count_area[0].dl))
695 break;
696 }
697 if (i == 5)
698 count_area = &private->count_area[0];
699 } else {
700 if (private->count_area[3].record == 1)
701 DEV_MESSAGE(KERN_WARNING, device, "%s",
702 "Trk 0: no records after VTOC!");
703 }
704 if (count_area != NULL && count_area->kl == 0) {
705 /* we found notthing violating our disk layout */
706 if (dasd_check_blocksize(count_area->dl) == 0)
707 device->bp_block = count_area->dl;
708 }
709 if (device->bp_block == 0) {
710 DEV_MESSAGE(KERN_WARNING, device, "%s",
711 "Volume has incompatible disk layout");
712 return -EMEDIUMTYPE;
713 }
714 device->s2b_shift = 0; /* bits to shift 512 to get a block */
715 for (sb = 512; sb < device->bp_block; sb = sb << 1)
716 device->s2b_shift++;
717
718 blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
719 device->blocks = (private->rdc_data.no_cyl *
720 private->rdc_data.trk_per_cyl *
721 blk_per_trk);
722
723 DEV_MESSAGE(KERN_INFO, device,
724 "(%dkB blks): %dkB at %dkB/trk %s",
725 (device->bp_block >> 10),
726 ((private->rdc_data.no_cyl *
727 private->rdc_data.trk_per_cyl *
728 blk_per_trk * (device->bp_block >> 9)) >> 1),
729 ((blk_per_trk * device->bp_block) >> 10),
730 private->uses_cdl ?
731 "compatible disk layout" : "linux disk layout");
732
733 return 0;
734}
735
736static int
737dasd_eckd_do_analysis(struct dasd_device *device)
738{
739 struct dasd_eckd_private *private;
740
741 private = (struct dasd_eckd_private *) device->private;
742 if (private->init_cqr_status < 0)
743 return dasd_eckd_start_analysis(device);
744 else
745 return dasd_eckd_end_analysis(device);
746}
747
748static int
749dasd_eckd_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
750{
751 struct dasd_eckd_private *private;
752
753 private = (struct dasd_eckd_private *) device->private;
754 if (dasd_check_blocksize(device->bp_block) == 0) {
755 geo->sectors = recs_per_track(&private->rdc_data,
756 0, device->bp_block);
757 }
758 geo->cylinders = private->rdc_data.no_cyl;
759 geo->heads = private->rdc_data.trk_per_cyl;
760 return 0;
761}
762
763static struct dasd_ccw_req *
764dasd_eckd_format_device(struct dasd_device * device,
765 struct format_data_t * fdata)
766{
767 struct dasd_eckd_private *private;
768 struct dasd_ccw_req *fcp;
769 struct eckd_count *ect;
770 struct ccw1 *ccw;
771 void *data;
772 int rpt, cyl, head;
773 int cplength, datasize;
774 int i;
775
776 private = (struct dasd_eckd_private *) device->private;
777 rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
778 cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
779 head = fdata->start_unit % private->rdc_data.trk_per_cyl;
780
781 /* Sanity checks. */
782 if (fdata->start_unit >=
783 (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
784 DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
785 fdata->start_unit);
786 return ERR_PTR(-EINVAL);
787 }
788 if (fdata->start_unit > fdata->stop_unit) {
789 DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
790 fdata->start_unit);
791 return ERR_PTR(-EINVAL);
792 }
793 if (dasd_check_blocksize(fdata->blksize) != 0) {
794 DEV_MESSAGE(KERN_WARNING, device,
795 "Invalid blocksize %d...terminating!",
796 fdata->blksize);
797 return ERR_PTR(-EINVAL);
798 }
799
800 /*
801 * fdata->intensity is a bit string that tells us what to do:
802 * Bit 0: write record zero
803 * Bit 1: write home address, currently not supported
804 * Bit 2: invalidate tracks
805 * Bit 3: use OS/390 compatible disk layout (cdl)
806 * Only some bit combinations do make sense.
807 */
808 switch (fdata->intensity) {
809 case 0x00: /* Normal format */
810 case 0x08: /* Normal format, use cdl. */
811 cplength = 2 + rpt;
812 datasize = sizeof(struct DE_eckd_data) +
813 sizeof(struct LO_eckd_data) +
814 rpt * sizeof(struct eckd_count);
815 break;
816 case 0x01: /* Write record zero and format track. */
817 case 0x09: /* Write record zero and format track, use cdl. */
818 cplength = 3 + rpt;
819 datasize = sizeof(struct DE_eckd_data) +
820 sizeof(struct LO_eckd_data) +
821 sizeof(struct eckd_count) +
822 rpt * sizeof(struct eckd_count);
823 break;
824 case 0x04: /* Invalidate track. */
825 case 0x0c: /* Invalidate track, use cdl. */
826 cplength = 3;
827 datasize = sizeof(struct DE_eckd_data) +
828 sizeof(struct LO_eckd_data) +
829 sizeof(struct eckd_count);
830 break;
831 default:
832 DEV_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.",
833 fdata->intensity);
834 return ERR_PTR(-EINVAL);
835 }
836 /* Allocate the format ccw request. */
837 fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
838 cplength, datasize, device);
839 if (IS_ERR(fcp))
840 return fcp;
841
842 data = fcp->data;
843 ccw = fcp->cpaddr;
844
845 switch (fdata->intensity & ~0x08) {
846 case 0x00: /* Normal format. */
847 define_extent(ccw++, (struct DE_eckd_data *) data,
848 fdata->start_unit, fdata->start_unit,
849 DASD_ECKD_CCW_WRITE_CKD, device);
850 data += sizeof(struct DE_eckd_data);
851 ccw[-1].flags |= CCW_FLAG_CC;
852 locate_record(ccw++, (struct LO_eckd_data *) data,
853 fdata->start_unit, 0, rpt,
854 DASD_ECKD_CCW_WRITE_CKD, device,
855 fdata->blksize);
856 data += sizeof(struct LO_eckd_data);
857 break;
858 case 0x01: /* Write record zero + format track. */
859 define_extent(ccw++, (struct DE_eckd_data *) data,
860 fdata->start_unit, fdata->start_unit,
861 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
862 device);
863 data += sizeof(struct DE_eckd_data);
864 ccw[-1].flags |= CCW_FLAG_CC;
865 locate_record(ccw++, (struct LO_eckd_data *) data,
866 fdata->start_unit, 0, rpt + 1,
867 DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
868 device->bp_block);
869 data += sizeof(struct LO_eckd_data);
870 break;
871 case 0x04: /* Invalidate track. */
872 define_extent(ccw++, (struct DE_eckd_data *) data,
873 fdata->start_unit, fdata->start_unit,
874 DASD_ECKD_CCW_WRITE_CKD, device);
875 data += sizeof(struct DE_eckd_data);
876 ccw[-1].flags |= CCW_FLAG_CC;
877 locate_record(ccw++, (struct LO_eckd_data *) data,
878 fdata->start_unit, 0, 1,
879 DASD_ECKD_CCW_WRITE_CKD, device, 8);
880 data += sizeof(struct LO_eckd_data);
881 break;
882 }
883 if (fdata->intensity & 0x01) { /* write record zero */
884 ect = (struct eckd_count *) data;
885 data += sizeof(struct eckd_count);
886 ect->cyl = cyl;
887 ect->head = head;
888 ect->record = 0;
889 ect->kl = 0;
890 ect->dl = 8;
891 ccw[-1].flags |= CCW_FLAG_CC;
892 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
893 ccw->flags = CCW_FLAG_SLI;
894 ccw->count = 8;
895 ccw->cda = (__u32)(addr_t) ect;
896 ccw++;
897 }
898 if ((fdata->intensity & ~0x08) & 0x04) { /* erase track */
899 ect = (struct eckd_count *) data;
900 data += sizeof(struct eckd_count);
901 ect->cyl = cyl;
902 ect->head = head;
903 ect->record = 1;
904 ect->kl = 0;
905 ect->dl = 0;
906 ccw[-1].flags |= CCW_FLAG_CC;
907 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
908 ccw->flags = CCW_FLAG_SLI;
909 ccw->count = 8;
910 ccw->cda = (__u32)(addr_t) ect;
911 } else { /* write remaining records */
912 for (i = 0; i < rpt; i++) {
913 ect = (struct eckd_count *) data;
914 data += sizeof(struct eckd_count);
915 ect->cyl = cyl;
916 ect->head = head;
917 ect->record = i + 1;
918 ect->kl = 0;
919 ect->dl = fdata->blksize;
920 /* Check for special tracks 0-1 when formatting CDL */
921 if ((fdata->intensity & 0x08) &&
922 fdata->start_unit == 0) {
923 if (i < 3) {
924 ect->kl = 4;
925 ect->dl = sizes_trk0[i] - 4;
926 }
927 }
928 if ((fdata->intensity & 0x08) &&
929 fdata->start_unit == 1) {
930 ect->kl = 44;
931 ect->dl = LABEL_SIZE - 44;
932 }
933 ccw[-1].flags |= CCW_FLAG_CC;
934 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
935 ccw->flags = CCW_FLAG_SLI;
936 ccw->count = 8;
937 ccw->cda = (__u32)(addr_t) ect;
938 ccw++;
939 }
940 }
941 fcp->device = device;
942 fcp->retries = 2; /* set retry counter to enable ERP */
943 fcp->buildclk = get_clock();
944 fcp->status = DASD_CQR_FILLED;
945 return fcp;
946}
947
948static dasd_era_t
949dasd_eckd_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
950{
951 struct dasd_device *device = (struct dasd_device *) cqr->device;
952 struct ccw_device *cdev = device->cdev;
953
954 if (irb->scsw.cstat == 0x00 &&
955 irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
956 return dasd_era_none;
957
958 switch (cdev->id.cu_type) {
959 case 0x3990:
960 case 0x2105:
961 case 0x2107:
962 case 0x1750:
963 return dasd_3990_erp_examine(cqr, irb);
964 case 0x9343:
965 return dasd_9343_erp_examine(cqr, irb);
966 case 0x3880:
967 default:
968 DEV_MESSAGE(KERN_WARNING, device, "%s",
969 "default (unknown CU type) - RECOVERABLE return");
970 return dasd_era_recover;
971 }
972}
973
974static dasd_erp_fn_t
975dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
976{
977 struct dasd_device *device = (struct dasd_device *) cqr->device;
978 struct ccw_device *cdev = device->cdev;
979
980 switch (cdev->id.cu_type) {
981 case 0x3990:
982 case 0x2105:
983 case 0x2107:
984 case 0x1750:
985 return dasd_3990_erp_action;
986 case 0x9343:
987 case 0x3880:
988 default:
989 return dasd_default_erp_action;
990 }
991}
992
993static dasd_erp_fn_t
994dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
995{
996 return dasd_default_erp_postaction;
997}
998
999static struct dasd_ccw_req *
1000dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
1001{
1002 struct dasd_eckd_private *private;
1003 unsigned long *idaws;
1004 struct LO_eckd_data *LO_data;
1005 struct dasd_ccw_req *cqr;
1006 struct ccw1 *ccw;
1007 struct bio *bio;
1008 struct bio_vec *bv;
1009 char *dst;
1010 unsigned int blksize, blk_per_trk, off;
1011 int count, cidaw, cplength, datasize;
1012 sector_t recid, first_rec, last_rec;
1013 sector_t first_trk, last_trk;
1014 unsigned int first_offs, last_offs;
1015 unsigned char cmd, rcmd;
1016 int i;
1017
1018 private = (struct dasd_eckd_private *) device->private;
1019 if (rq_data_dir(req) == READ)
1020 cmd = DASD_ECKD_CCW_READ_MT;
1021 else if (rq_data_dir(req) == WRITE)
1022 cmd = DASD_ECKD_CCW_WRITE_MT;
1023 else
1024 return ERR_PTR(-EINVAL);
1025 /* Calculate number of blocks/records per track. */
1026 blksize = device->bp_block;
1027 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1028 /* Calculate record id of first and last block. */
1029 first_rec = first_trk = req->sector >> device->s2b_shift;
1030 first_offs = sector_div(first_trk, blk_per_trk);
1031 last_rec = last_trk =
1032 (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
1033 last_offs = sector_div(last_trk, blk_per_trk);
1034 /* Check struct bio and count the number of blocks for the request. */
1035 count = 0;
1036 cidaw = 0;
1037 rq_for_each_bio(bio, req) {
1038 bio_for_each_segment(bv, bio, i) {
1039 if (bv->bv_len & (blksize - 1))
1040 /* Eckd can only do full blocks. */
1041 return ERR_PTR(-EINVAL);
1042 count += bv->bv_len >> (device->s2b_shift + 9);
347a8dc3 1043#if defined(CONFIG_64BIT)
1da177e4
LT		 1044 if (idal_is_needed (page_address(bv->bv_page),
1045 bv->bv_len))
1046 cidaw += bv->bv_len >> (device->s2b_shift + 9);
1047#endif
1048 }
1049 }
1050 /* Paranoia. */
1051 if (count != last_rec - first_rec + 1)
1052 return ERR_PTR(-EINVAL);
1053 /* 1x define extent + 1x locate record + number of blocks */
1054 cplength = 2 + count;
1055 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1056 datasize = sizeof(struct DE_eckd_data) + sizeof(struct LO_eckd_data) +
1057 cidaw * sizeof(unsigned long);
1058 /* Find out the number of additional locate record ccws for cdl. */
1059 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1060 if (last_rec >= 2*blk_per_trk)
1061 count = 2*blk_per_trk - first_rec;
1062 cplength += count;
1063 datasize += count*sizeof(struct LO_eckd_data);
1064 }
1065 /* Allocate the ccw request. */
1066 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1067 cplength, datasize, device);
1068 if (IS_ERR(cqr))
1069 return cqr;
1070 ccw = cqr->cpaddr;
1071 /* First ccw is define extent. */
1072 define_extent(ccw++, cqr->data, first_trk, last_trk, cmd, device);
1073 /* Build locate_record+read/write/ccws. */
1074 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_eckd_data));
1075 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1076 recid = first_rec;
1077 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1078 /* Only standard blocks so there is just one locate record. */
1079 ccw[-1].flags |= CCW_FLAG_CC;
1080 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1081 last_rec - recid + 1, cmd, device, blksize);
1082 }
1083 rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
1084 dst = page_address(bv->bv_page) + bv->bv_offset;
1085 if (dasd_page_cache) {
1086 char *copy = kmem_cache_alloc(dasd_page_cache,
1087 SLAB_DMA | __GFP_NOWARN);
1088 if (copy && rq_data_dir(req) == WRITE)
1089 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1090 if (copy)
1091 dst = copy + bv->bv_offset;
1092 }
1093 for (off = 0; off < bv->bv_len; off += blksize) {
1094 sector_t trkid = recid;
1095 unsigned int recoffs = sector_div(trkid, blk_per_trk);
1096 rcmd = cmd;
1097 count = blksize;
1098 /* Locate record for cdl special block ? */
1099 if (private->uses_cdl && recid < 2*blk_per_trk) {
1100 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1101 rcmd |= 0x8;
1102 count = dasd_eckd_cdl_reclen(recid);
ec5883ab
HH		 1103 if (count < blksize &&
1104 rq_data_dir(req) == READ)
1da177e4
LT		 1105 memset(dst + count, 0xe5,
1106 blksize - count);
1107 }
1108 ccw[-1].flags |= CCW_FLAG_CC;
1109 locate_record(ccw++, LO_data++,
1110 trkid, recoffs + 1,
1111 1, rcmd, device, count);
1112 }
1113 /* Locate record for standard blocks ? */
1114 if (private->uses_cdl && recid == 2*blk_per_trk) {
1115 ccw[-1].flags |= CCW_FLAG_CC;
1116 locate_record(ccw++, LO_data++,
1117 trkid, recoffs + 1,
1118 last_rec - recid + 1,
1119 cmd, device, count);
1120 }
1121 /* Read/write ccw. */
1122 ccw[-1].flags |= CCW_FLAG_CC;
1123 ccw->cmd_code = rcmd;
1124 ccw->count = count;
1125 if (idal_is_needed(dst, blksize)) {
1126 ccw->cda = (__u32)(addr_t) idaws;
1127 ccw->flags = CCW_FLAG_IDA;
1128 idaws = idal_create_words(idaws, dst, blksize);
1129 } else {
1130 ccw->cda = (__u32)(addr_t) dst;
1131 ccw->flags = 0;
1132 }
1133 ccw++;
1134 dst += blksize;
1135 recid++;
1136 }
1137 }
1c01b8a5
HH		 1138 if (req->flags & REQ_FAILFAST)
1139 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1da177e4
LT		 1140 cqr->device = device;
1141 cqr->expires = 5 * 60 * HZ; /* 5 minutes */
1142 cqr->lpm = private->path_data.ppm;
1143 cqr->retries = 256;
1144 cqr->buildclk = get_clock();
1145 cqr->status = DASD_CQR_FILLED;
1146 return cqr;
1147}
1148
1149static int
1150dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
1151{
1152 struct dasd_eckd_private *private;
1153 struct ccw1 *ccw;
1154 struct bio *bio;
1155 struct bio_vec *bv;
1156 char *dst, *cda;
1157 unsigned int blksize, blk_per_trk, off;
1158 sector_t recid;
1159 int i, status;
1160
1161 if (!dasd_page_cache)
1162 goto out;
1163 private = (struct dasd_eckd_private *) cqr->device->private;
1164 blksize = cqr->device->bp_block;
1165 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1166 recid = req->sector >> cqr->device->s2b_shift;
1167 ccw = cqr->cpaddr;
1168 /* Skip over define extent & locate record. */
1169 ccw++;
1170 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
1171 ccw++;
1172 rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
1173 dst = page_address(bv->bv_page) + bv->bv_offset;
1174 for (off = 0; off < bv->bv_len; off += blksize) {
1175 /* Skip locate record. */
1176 if (private->uses_cdl && recid <= 2*blk_per_trk)
1177 ccw++;
1178 if (dst) {
1179 if (ccw->flags & CCW_FLAG_IDA)
1180 cda = *((char **)((addr_t) ccw->cda));
1181 else
1182 cda = (char *)((addr_t) ccw->cda);
1183 if (dst != cda) {
1184 if (rq_data_dir(req) == READ)
1185 memcpy(dst, cda, bv->bv_len);
1186 kmem_cache_free(dasd_page_cache,
1187 (void *)((addr_t)cda & PAGE_MASK));
1188 }
1189 dst = NULL;
1190 }
1191 ccw++;
1192 recid++;
1193 }
1194 }
1195out:
1196 status = cqr->status == DASD_CQR_DONE;
1197 dasd_sfree_request(cqr, cqr->device);
1198 return status;
1199}
1200
1201static int
1202dasd_eckd_fill_info(struct dasd_device * device,
1203 struct dasd_information2_t * info)
1204{
1205 struct dasd_eckd_private *private;
1206
1207 private = (struct dasd_eckd_private *) device->private;
1208 info->label_block = 2;
1209 info->FBA_layout = private->uses_cdl ? 0 : 1;
1210 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
1211 info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
1212 memcpy(info->characteristics, &private->rdc_data,
1213 sizeof(struct dasd_eckd_characteristics));
1214 info->confdata_size = sizeof (struct dasd_eckd_confdata);
1215 memcpy(info->configuration_data, &private->conf_data,
1216 sizeof (struct dasd_eckd_confdata));
1217 return 0;
1218}
1219
1220/*
1221 * SECTION: ioctl functions for eckd devices.
1222 */
1223
1224/*
1225 * Release device ioctl.
1226 * Buils a channel programm to releases a prior reserved
1227 * (see dasd_eckd_reserve) device.
1228 */
1229static int
1107ccfb 1230dasd_eckd_release(struct dasd_device *device)
1da177e4 1231{
1da177e4
LT		 1232 struct dasd_ccw_req *cqr;
1233 int rc;
1234
1235 if (!capable(CAP_SYS_ADMIN))
1236 return -EACCES;
1237
1da177e4
LT		 1238 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1239 1, 32, device);
1240 if (IS_ERR(cqr)) {
1241 DEV_MESSAGE(KERN_WARNING, device, "%s",
1242 "Could not allocate initialization request");
1243 return PTR_ERR(cqr);
1244 }
1245 cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
1246 cqr->cpaddr->flags |= CCW_FLAG_SLI;
1247 cqr->cpaddr->count = 32;
1248 cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1249 cqr->device = device;
1250 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1c01b8a5 1251 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1da177e4
LT		 1252 cqr->retries = 0;
1253 cqr->expires = 2 * HZ;
1254 cqr->buildclk = get_clock();
1255 cqr->status = DASD_CQR_FILLED;
1256
1257 rc = dasd_sleep_on_immediatly(cqr);
1258
1259 dasd_sfree_request(cqr, cqr->device);
1260 return rc;
1261}
1262
1263/*
1264 * Reserve device ioctl.
1265 * Options are set to 'synchronous wait for interrupt' and
1266 * 'timeout the request'. This leads to a terminate IO if
1267 * the interrupt is outstanding for a certain time.
1268 */
1269static int
1107ccfb 1270dasd_eckd_reserve(struct dasd_device *device)
1da177e4 1271{
1da177e4
LT		 1272 struct dasd_ccw_req *cqr;
1273 int rc;
1274
1275 if (!capable(CAP_SYS_ADMIN))
1276 return -EACCES;
1277
1da177e4
LT		 1278 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1279 1, 32, device);
1280 if (IS_ERR(cqr)) {
1281 DEV_MESSAGE(KERN_WARNING, device, "%s",
1282 "Could not allocate initialization request");
1283 return PTR_ERR(cqr);
1284 }
1285 cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
1286 cqr->cpaddr->flags |= CCW_FLAG_SLI;
1287 cqr->cpaddr->count = 32;
1288 cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1289 cqr->device = device;
1290 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1c01b8a5 1291 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1da177e4
LT		 1292 cqr->retries = 0;
1293 cqr->expires = 2 * HZ;
1294 cqr->buildclk = get_clock();
1295 cqr->status = DASD_CQR_FILLED;
1296
1297 rc = dasd_sleep_on_immediatly(cqr);
1298
1299 dasd_sfree_request(cqr, cqr->device);
1300 return rc;
1301}
1302
1303/*
1304 * Steal lock ioctl - unconditional reserve device.
1305 * Buils a channel programm to break a device's reservation.
1306 * (unconditional reserve)
1307 */
1308static int
1107ccfb 1309dasd_eckd_steal_lock(struct dasd_device *device)
1da177e4 1310{
1da177e4
LT		 1311 struct dasd_ccw_req *cqr;
1312 int rc;
1313
1314 if (!capable(CAP_SYS_ADMIN))
1315 return -EACCES;
1316
1da177e4
LT		 1317 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1318 1, 32, device);
1319 if (IS_ERR(cqr)) {
1320 DEV_MESSAGE(KERN_WARNING, device, "%s",
1321 "Could not allocate initialization request");
1322 return PTR_ERR(cqr);
1323 }
1324 cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
1325 cqr->cpaddr->flags |= CCW_FLAG_SLI;
1326 cqr->cpaddr->count = 32;
1327 cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1328 cqr->device = device;
1329 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1c01b8a5 1330 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1da177e4
LT		 1331 cqr->retries = 0;
1332 cqr->expires = 2 * HZ;
1333 cqr->buildclk = get_clock();
1334 cqr->status = DASD_CQR_FILLED;
1335
1336 rc = dasd_sleep_on_immediatly(cqr);
1337
1338 dasd_sfree_request(cqr, cqr->device);
1339 return rc;
1340}
1341
1342/*
1343 * Read performance statistics
1344 */
1345static int
1107ccfb 1346dasd_eckd_performance(struct dasd_device *device, void __user *argp)
1da177e4 1347{
1da177e4
LT		 1348 struct dasd_psf_prssd_data *prssdp;
1349 struct dasd_rssd_perf_stats_t *stats;
1350 struct dasd_ccw_req *cqr;
1351 struct ccw1 *ccw;
1352 int rc;
1353
1da177e4
LT		 1354 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1355 1 /* PSF */ + 1 /* RSSD */ ,
1356 (sizeof (struct dasd_psf_prssd_data) +
1357 sizeof (struct dasd_rssd_perf_stats_t)),
1358 device);
1359 if (IS_ERR(cqr)) {
1360 DEV_MESSAGE(KERN_WARNING, device, "%s",
1361 "Could not allocate initialization request");
1362 return PTR_ERR(cqr);
1363 }
1364 cqr->device = device;
1365 cqr->retries = 0;
1366 cqr->expires = 10 * HZ;
1367
1368 /* Prepare for Read Subsystem Data */
1369 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1370 memset(prssdp, 0, sizeof (struct dasd_psf_prssd_data));
1371 prssdp->order = PSF_ORDER_PRSSD;
1372 prssdp->suborder = 0x01; /* Perfomance Statistics */
1373 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
1374
1375 ccw = cqr->cpaddr;
1376 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1377 ccw->count = sizeof (struct dasd_psf_prssd_data);
1378 ccw->flags |= CCW_FLAG_CC;
1379 ccw->cda = (__u32)(addr_t) prssdp;
1380
1381 /* Read Subsystem Data - Performance Statistics */
1382 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1383 memset(stats, 0, sizeof (struct dasd_rssd_perf_stats_t));
1384
1385 ccw++;
1386 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1387 ccw->count = sizeof (struct dasd_rssd_perf_stats_t);
1388 ccw->cda = (__u32)(addr_t) stats;
1389
1390 cqr->buildclk = get_clock();
1391 cqr->status = DASD_CQR_FILLED;
1392 rc = dasd_sleep_on(cqr);
1393 if (rc == 0) {
1394 /* Prepare for Read Subsystem Data */
1395 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1396 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1107ccfb
CH		 1397 if (copy_to_user(argp, stats,
1398 sizeof(struct dasd_rssd_perf_stats_t)))
1399 rc = -EFAULT;
1da177e4
LT		 1400 }
1401 dasd_sfree_request(cqr, cqr->device);
1402 return rc;
1403}
1404
1405/*
1406 * Get attributes (cache operations)
1407 * Returnes the cache attributes used in Define Extend (DE).
1408 */
1409static int
1107ccfb 1410dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
1da177e4 1411{
1107ccfb
CH		 1412 struct dasd_eckd_private *private =
1413 (struct dasd_eckd_private *)device->private;
1414 struct attrib_data_t attrib = private->attrib;
1da177e4
LT		 1415 int rc;
1416
1417 if (!capable(CAP_SYS_ADMIN))
1418 return -EACCES;
1107ccfb 1419 if (!argp)
1da177e4
LT		 1420 return -EINVAL;
1421
1107ccfb
CH		 1422 rc = 0;
1423 if (copy_to_user(argp, (long *) &attrib,
1424 sizeof (struct attrib_data_t)))
1425 rc = -EFAULT;
1da177e4
LT		 1426
1427 return rc;
1428}
1429
1430/*
1431 * Set attributes (cache operations)
1432 * Stores the attributes for cache operation to be used in Define Extend (DE).
1433 */
1434static int
1107ccfb 1435dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
1da177e4 1436{
1107ccfb
CH		 1437 struct dasd_eckd_private *private =
1438 (struct dasd_eckd_private *)device->private;
1da177e4
LT		 1439 struct attrib_data_t attrib;
1440
1441 if (!capable(CAP_SYS_ADMIN))
1442 return -EACCES;
1107ccfb 1443 if (!argp)
1da177e4
LT		 1444 return -EINVAL;
1445
1107ccfb 1446 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
1da177e4 1447 return -EFAULT;
1da177e4
LT		 1448 private->attrib = attrib;
1449
1450 DEV_MESSAGE(KERN_INFO, device,
1451 "cache operation mode set to %x (%i cylinder prestage)",
1452 private->attrib.operation, private->attrib.nr_cyl);
1453 return 0;
1454}
1455
1107ccfb
CH		 1456static int
1457dasd_eckd_ioctl(struct dasd_device *device, unsigned int cmd, void __user *argp)
1458{
1459 switch (cmd) {
1460 case BIODASDGATTR:
1461 return dasd_eckd_get_attrib(device, argp);
1462 case BIODASDSATTR:
1463 return dasd_eckd_set_attrib(device, argp);
1464 case BIODASDPSRD:
1465 return dasd_eckd_performance(device, argp);
1466 case BIODASDRLSE:
1467 return dasd_eckd_release(device);
1468 case BIODASDRSRV:
1469 return dasd_eckd_reserve(device);
1470 case BIODASDSLCK:
1471 return dasd_eckd_steal_lock(device);
1472 default:
1473 return -ENOIOCTLCMD;
1474 }
1475}
1476
1da177e4
LT		 1477/*
1478 * Print sense data and related channel program.
1479 * Parts are printed because printk buffer is only 1024 bytes.
1480 */
1481static void
1482dasd_eckd_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
1483 struct irb *irb)
1484{
1485 char *page;
1486 struct ccw1 *act, *end, *last;
1487 int len, sl, sct, count;
1488
1489 page = (char *) get_zeroed_page(GFP_ATOMIC);
1490 if (page == NULL) {
1491 DEV_MESSAGE(KERN_ERR, device, " %s",
1492 "No memory to dump sense data");
1493 return;
1494 }
1495 len = sprintf(page, KERN_ERR PRINTK_HEADER
1496 " I/O status report for device %s:\n",
1497 device->cdev->dev.bus_id);
1498 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1499 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
1500 irb->scsw.cstat, irb->scsw.dstat);
1501 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1502 " device %s: Failing CCW: %p\n",
1503 device->cdev->dev.bus_id,
1504 (void *) (addr_t) irb->scsw.cpa);
1505 if (irb->esw.esw0.erw.cons) {
1506 for (sl = 0; sl < 4; sl++) {
1507 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1508 " Sense(hex) %2d-%2d:",
1509 (8 * sl), ((8 * sl) + 7));
1510
1511 for (sct = 0; sct < 8; sct++) {
1512 len += sprintf(page + len, " %02x",
1513 irb->ecw[8 * sl + sct]);
1514 }
1515 len += sprintf(page + len, "\n");
1516 }
1517
1518 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
1519 /* 24 Byte Sense Data */
1520 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1521 " 24 Byte: %x MSG %x, "
1522 "%s MSGb to SYSOP\n",
1523 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
1524 irb->ecw[1] & 0x10 ? "" : "no");
1525 } else {
1526 /* 32 Byte Sense Data */
1527 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1528 " 32 Byte: Format: %x "
1529 "Exception class %x\n",
1530 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
1531 }
1532 } else {
1533 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1534 " SORRY - NO VALID SENSE AVAILABLE\n");
1535 }
1536 MESSAGE_LOG(KERN_ERR, "%s",
1537 page + sizeof(KERN_ERR PRINTK_HEADER));
1538
1539 /* dump the Channel Program */
1540 /* print first CCWs (maximum 8) */
1541 act = req->cpaddr;
1542 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
1543 end = min(act + 8, last);
1544 len = sprintf(page, KERN_ERR PRINTK_HEADER
1545 " Related CP in req: %p\n", req);
1546 while (act <= end) {
1547 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1548 " CCW %p: %08X %08X DAT:",
1549 act, ((int *) act)[0], ((int *) act)[1]);
1550 for (count = 0; count < 32 && count < act->count;
1551 count += sizeof(int))
1552 len += sprintf(page + len, " %08X",
1553 ((int *) (addr_t) act->cda)
1554 [(count>>2)]);
1555 len += sprintf(page + len, "\n");
1556 act++;
1557 }
1558 MESSAGE_LOG(KERN_ERR, "%s",
1559 page + sizeof(KERN_ERR PRINTK_HEADER));
1560
1561 /* print failing CCW area */
1562 len = 0;
1563 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
1564 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
1565 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
1566 }
1567 end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
1568 while (act <= end) {
1569 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1570 " CCW %p: %08X %08X DAT:",
1571 act, ((int *) act)[0], ((int *) act)[1]);
1572 for (count = 0; count < 32 && count < act->count;
1573 count += sizeof(int))
1574 len += sprintf(page + len, " %08X",
1575 ((int *) (addr_t) act->cda)
1576 [(count>>2)]);
1577 len += sprintf(page + len, "\n");
1578 act++;
1579 }
1580
1581 /* print last CCWs */
1582 if (act < last - 2) {
1583 act = last - 2;
1584 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
1585 }
1586 while (act <= last) {
1587 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1588 " CCW %p: %08X %08X DAT:",
1589 act, ((int *) act)[0], ((int *) act)[1]);
1590 for (count = 0; count < 32 && count < act->count;
1591 count += sizeof(int))
1592 len += sprintf(page + len, " %08X",
1593 ((int *) (addr_t) act->cda)
1594 [(count>>2)]);
1595 len += sprintf(page + len, "\n");
1596 act++;
1597 }
1598 if (len > 0)
1599 MESSAGE_LOG(KERN_ERR, "%s",
1600 page + sizeof(KERN_ERR PRINTK_HEADER));
1601 free_page((unsigned long) page);
1602}
1603
1604/*
1605 * max_blocks is dependent on the amount of storage that is available
1606 * in the static io buffer for each device. Currently each device has
1607 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
1608 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
1609 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
1610 * addition we have one define extent ccw + 16 bytes of data and one
1611 * locate record ccw + 16 bytes of data. That makes:
1612 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
1613 * We want to fit two into the available memory so that we can immediately
1614 * start the next request if one finishes off. That makes 249.5 blocks
1615 * for one request. Give a little safety and the result is 240.
1616 */
1617static struct dasd_discipline dasd_eckd_discipline = {
1618 .owner = THIS_MODULE,
1619 .name = "ECKD",
1620 .ebcname = "ECKD",
1621 .max_blocks = 240,
1622 .check_device = dasd_eckd_check_characteristics,
1623 .do_analysis = dasd_eckd_do_analysis,
1624 .fill_geometry = dasd_eckd_fill_geometry,
1625 .start_IO = dasd_start_IO,
1626 .term_IO = dasd_term_IO,
1627 .format_device = dasd_eckd_format_device,
1628 .examine_error = dasd_eckd_examine_error,
1629 .erp_action = dasd_eckd_erp_action,
1630 .erp_postaction = dasd_eckd_erp_postaction,
1631 .build_cp = dasd_eckd_build_cp,
1632 .free_cp = dasd_eckd_free_cp,
1633 .dump_sense = dasd_eckd_dump_sense,
1634 .fill_info = dasd_eckd_fill_info,
1107ccfb 1635 .ioctl = dasd_eckd_ioctl,
1da177e4
LT		 1636};
1637
1638static int __init
1639dasd_eckd_init(void)
1640{
1641 int ret;
1642
1da177e4
LT		 1643 ASCEBC(dasd_eckd_discipline.ebcname, 4);
1644
1645 ret = ccw_driver_register(&dasd_eckd_driver);
1107ccfb
CH		 1646 if (!ret)
1647 dasd_generic_auto_online(&dasd_eckd_driver);
1648 return ret;
1da177e4
LT		 1649}
1650
1651static void __exit
1652dasd_eckd_cleanup(void)
1653{
1654 ccw_driver_unregister(&dasd_eckd_driver);
1da177e4
LT		 1655}
1656
1657module_init(dasd_eckd_init);
1658module_exit(dasd_eckd_cleanup);
1659
1660/*
1661 * Overrides for Emacs so that we follow Linus's tabbing style.
1662 * Emacs will notice this stuff at the end of the file and automatically
1663 * adjust the settings for this buffer only. This must remain at the end
1664 * of the file.
1665 * ---------------------------------------------------------------------------
1666 * Local variables:
1667 * c-indent-level: 4
1668 * c-brace-imaginary-offset: 0
1669 * c-brace-offset: -4
1670 * c-argdecl-indent: 4
1671 * c-label-offset: -4
1672 * c-continued-statement-offset: 4
1673 * c-continued-brace-offset: 0
1674 * indent-tabs-mode: 1
1675 * tab-width: 8
1676 * End:
1677 */
Linux 6.x block layer and io_uring tree(s)