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[S390] missing check in dasd_eer_open.
[linux-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
3d052595
HH		 449/*
450 * Generate device unique id that specifies the physical device.
451 */
452static int
453dasd_eckd_generate_uid(struct dasd_device *device, struct dasd_uid *uid)
454{
455 struct dasd_eckd_private *private;
456 struct dasd_eckd_confdata *confdata;
457
458 private = (struct dasd_eckd_private *) device->private;
459 if (!private)
460 return -ENODEV;
461 confdata = &private->conf_data;
462 if (!confdata)
463 return -ENODEV;
464
465 memset(uid, 0, sizeof(struct dasd_uid));
466 strncpy(uid->vendor, confdata->ned1.HDA_manufacturer,
467 sizeof(uid->vendor) - 1);
468 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
469 strncpy(uid->serial, confdata->ned1.HDA_location,
470 sizeof(uid->serial) - 1);
471 EBCASC(uid->serial, sizeof(uid->serial) - 1);
472 uid->ssid = confdata->neq.subsystemID;
473 if (confdata->ned2.sneq.flags == 0x40) {
474 uid->alias = 1;
475 uid->unit_addr = confdata->ned2.sneq.base_unit_addr;
476 } else
477 uid->unit_addr = confdata->ned1.unit_addr;
478
479 return 0;
480}
481
1da177e4
LT		 482static int
483dasd_eckd_read_conf(struct dasd_device *device)
484{
485 void *conf_data;
486 int conf_len, conf_data_saved;
487 int rc;
488 __u8 lpm;
489 struct dasd_eckd_private *private;
490 struct dasd_eckd_path *path_data;
491
492 private = (struct dasd_eckd_private *) device->private;
493 path_data = (struct dasd_eckd_path *) &private->path_data;
494 path_data->opm = ccw_device_get_path_mask(device->cdev);
495 lpm = 0x80;
496 conf_data_saved = 0;
497
498 /* get configuration data per operational path */
499 for (lpm = 0x80; lpm; lpm>>= 1) {
500 if (lpm & path_data->opm){
501 rc = read_conf_data_lpm(device->cdev, &conf_data,
502 &conf_len, lpm);
503 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
504 MESSAGE(KERN_WARNING,
505 "Read configuration data returned "
506 "error %d", rc);
507 return rc;
508 }
509 if (conf_data == NULL) {
510 MESSAGE(KERN_WARNING, "%s", "No configuration "
511 "data retrieved");
512 continue; /* no errror */
513 }
514 if (conf_len != sizeof (struct dasd_eckd_confdata)) {
515 MESSAGE(KERN_WARNING,
516 "sizes of configuration data mismatch"
517 "%d (read) vs %ld (expected)",
518 conf_len,
519 sizeof (struct dasd_eckd_confdata));
520 kfree(conf_data);
521 continue; /* no errror */
522 }
523 /* save first valid configuration data */
524 if (!conf_data_saved){
525 memcpy(&private->conf_data, conf_data,
526 sizeof (struct dasd_eckd_confdata));
527 conf_data_saved++;
528 }
529 switch (((char *)conf_data)[242] & 0x07){
530 case 0x02:
531 path_data->npm |= lpm;
532 break;
533 case 0x03:
534 path_data->ppm |= lpm;
535 break;
536 }
537 kfree(conf_data);
538 }
539 }
540 return 0;
541}
542
3d052595
HH		 543/*
544 * Check device characteristics.
545 * If the device is accessible using ECKD discipline, the device is enabled.
546 */
1da177e4
LT		 547static int
548dasd_eckd_check_characteristics(struct dasd_device *device)
549{
550 struct dasd_eckd_private *private;
3d052595 551 struct dasd_uid uid;
1da177e4
LT		 552 void *rdc_data;
553 int rc;
554
555 private = (struct dasd_eckd_private *) device->private;
556 if (private == NULL) {
557 private = kmalloc(sizeof(struct dasd_eckd_private),
558 GFP_KERNEL | GFP_DMA);
559 if (private == NULL) {
560 DEV_MESSAGE(KERN_WARNING, device, "%s",
561 "memory allocation failed for private "
562 "data");
563 return -ENOMEM;
564 }
565 memset(private, 0, sizeof(struct dasd_eckd_private));
566 device->private = (void *) private;
567 }
568 /* Invalidate status of initial analysis. */
569 private->init_cqr_status = -1;
570 /* Set default cache operations. */
571 private->attrib.operation = DASD_NORMAL_CACHE;
572 private->attrib.nr_cyl = 0;
573
574 /* Read Device Characteristics */
575 rdc_data = (void *) &(private->rdc_data);
3d052595 576 memset(rdc_data, 0, sizeof(rdc_data));
1da177e4
LT		 577 rc = read_dev_chars(device->cdev, &rdc_data, 64);
578 if (rc) {
579 DEV_MESSAGE(KERN_WARNING, device,
580 "Read device characteristics returned error %d",
581 rc);
582 return rc;
583 }
584
585 DEV_MESSAGE(KERN_INFO, device,
586 "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
587 private->rdc_data.dev_type,
588 private->rdc_data.dev_model,
589 private->rdc_data.cu_type,
590 private->rdc_data.cu_model.model,
591 private->rdc_data.no_cyl,
592 private->rdc_data.trk_per_cyl,
593 private->rdc_data.sec_per_trk);
594
595 /* Read Configuration Data */
596 rc = dasd_eckd_read_conf (device);
3d052595
HH		 597 if (rc)
598 return rc;
599
600 /* Generate device unique id and register in devmap */
601 rc = dasd_eckd_generate_uid(device, &uid);
602 if (rc)
603 return rc;
1da177e4 604
3d052595
HH		 605 rc = dasd_set_uid(device->cdev, &uid);
606
607 return rc;
1da177e4
LT		 608}
609
610static struct dasd_ccw_req *
611dasd_eckd_analysis_ccw(struct dasd_device *device)
612{
613 struct dasd_eckd_private *private;
614 struct eckd_count *count_data;
615 struct LO_eckd_data *LO_data;
616 struct dasd_ccw_req *cqr;
617 struct ccw1 *ccw;
618 int cplength, datasize;
619 int i;
620
621 private = (struct dasd_eckd_private *) device->private;
622
623 cplength = 8;
624 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
625 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
626 cplength, datasize, device);
627 if (IS_ERR(cqr))
628 return cqr;
629 ccw = cqr->cpaddr;
630 /* Define extent for the first 3 tracks. */
631 define_extent(ccw++, cqr->data, 0, 2,
632 DASD_ECKD_CCW_READ_COUNT, device);
633 LO_data = cqr->data + sizeof (struct DE_eckd_data);
634 /* Locate record for the first 4 records on track 0. */
635 ccw[-1].flags |= CCW_FLAG_CC;
636 locate_record(ccw++, LO_data++, 0, 0, 4,
637 DASD_ECKD_CCW_READ_COUNT, device, 0);
638
639 count_data = private->count_area;
640 for (i = 0; i < 4; i++) {
641 ccw[-1].flags |= CCW_FLAG_CC;
642 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
643 ccw->flags = 0;
644 ccw->count = 8;
645 ccw->cda = (__u32)(addr_t) count_data;
646 ccw++;
647 count_data++;
648 }
649
650 /* Locate record for the first record on track 2. */
651 ccw[-1].flags |= CCW_FLAG_CC;
652 locate_record(ccw++, LO_data++, 2, 0, 1,
653 DASD_ECKD_CCW_READ_COUNT, device, 0);
654 /* Read count ccw. */
655 ccw[-1].flags |= CCW_FLAG_CC;
656 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
657 ccw->flags = 0;
658 ccw->count = 8;
659 ccw->cda = (__u32)(addr_t) count_data;
660
661 cqr->device = device;
662 cqr->retries = 0;
663 cqr->buildclk = get_clock();
664 cqr->status = DASD_CQR_FILLED;
665 return cqr;
666}
667
668/*
669 * This is the callback function for the init_analysis cqr. It saves
670 * the status of the initial analysis ccw before it frees it and kicks
671 * the device to continue the startup sequence. This will call
672 * dasd_eckd_do_analysis again (if the devices has not been marked
673 * for deletion in the meantime).
674 */
675static void
676dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
677{
678 struct dasd_eckd_private *private;
679 struct dasd_device *device;
680
681 device = init_cqr->device;
682 private = (struct dasd_eckd_private *) device->private;
683 private->init_cqr_status = init_cqr->status;
684 dasd_sfree_request(init_cqr, device);
685 dasd_kick_device(device);
686}
687
688static int
689dasd_eckd_start_analysis(struct dasd_device *device)
690{
691 struct dasd_eckd_private *private;
692 struct dasd_ccw_req *init_cqr;
693
694 private = (struct dasd_eckd_private *) device->private;
695 init_cqr = dasd_eckd_analysis_ccw(device);
696 if (IS_ERR(init_cqr))
697 return PTR_ERR(init_cqr);
698 init_cqr->callback = dasd_eckd_analysis_callback;
699 init_cqr->callback_data = NULL;
700 init_cqr->expires = 5*HZ;
701 dasd_add_request_head(init_cqr);
702 return -EAGAIN;
703}
704
705static int
706dasd_eckd_end_analysis(struct dasd_device *device)
707{
708 struct dasd_eckd_private *private;
709 struct eckd_count *count_area;
710 unsigned int sb, blk_per_trk;
711 int status, i;
712
713 private = (struct dasd_eckd_private *) device->private;
714 status = private->init_cqr_status;
715 private->init_cqr_status = -1;
716 if (status != DASD_CQR_DONE) {
717 DEV_MESSAGE(KERN_WARNING, device, "%s",
718 "volume analysis returned unformatted disk");
719 return -EMEDIUMTYPE;
720 }
721
722 private->uses_cdl = 1;
723 /* Calculate number of blocks/records per track. */
724 blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
725 /* Check Track 0 for Compatible Disk Layout */
726 count_area = NULL;
727 for (i = 0; i < 3; i++) {
728 if (private->count_area[i].kl != 4 ||
729 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
730 private->uses_cdl = 0;
731 break;
732 }
733 }
734 if (i == 3)
735 count_area = &private->count_area[4];
736
737 if (private->uses_cdl == 0) {
738 for (i = 0; i < 5; i++) {
739 if ((private->count_area[i].kl != 0) ||
740 (private->count_area[i].dl !=
741 private->count_area[0].dl))
742 break;
743 }
744 if (i == 5)
745 count_area = &private->count_area[0];
746 } else {
747 if (private->count_area[3].record == 1)
748 DEV_MESSAGE(KERN_WARNING, device, "%s",
749 "Trk 0: no records after VTOC!");
750 }
751 if (count_area != NULL && count_area->kl == 0) {
752 /* we found notthing violating our disk layout */
753 if (dasd_check_blocksize(count_area->dl) == 0)
754 device->bp_block = count_area->dl;
755 }
756 if (device->bp_block == 0) {
757 DEV_MESSAGE(KERN_WARNING, device, "%s",
758 "Volume has incompatible disk layout");
759 return -EMEDIUMTYPE;
760 }
761 device->s2b_shift = 0; /* bits to shift 512 to get a block */
762 for (sb = 512; sb < device->bp_block; sb = sb << 1)
763 device->s2b_shift++;
764
765 blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
766 device->blocks = (private->rdc_data.no_cyl *
767 private->rdc_data.trk_per_cyl *
768 blk_per_trk);
769
770 DEV_MESSAGE(KERN_INFO, device,
771 "(%dkB blks): %dkB at %dkB/trk %s",
772 (device->bp_block >> 10),
773 ((private->rdc_data.no_cyl *
774 private->rdc_data.trk_per_cyl *
775 blk_per_trk * (device->bp_block >> 9)) >> 1),
776 ((blk_per_trk * device->bp_block) >> 10),
777 private->uses_cdl ?
778 "compatible disk layout" : "linux disk layout");
779
780 return 0;
781}
782
783static int
784dasd_eckd_do_analysis(struct dasd_device *device)
785{
786 struct dasd_eckd_private *private;
787
788 private = (struct dasd_eckd_private *) device->private;
789 if (private->init_cqr_status < 0)
790 return dasd_eckd_start_analysis(device);
791 else
792 return dasd_eckd_end_analysis(device);
793}
794
795static int
796dasd_eckd_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
797{
798 struct dasd_eckd_private *private;
799
800 private = (struct dasd_eckd_private *) device->private;
801 if (dasd_check_blocksize(device->bp_block) == 0) {
802 geo->sectors = recs_per_track(&private->rdc_data,
803 0, device->bp_block);
804 }
805 geo->cylinders = private->rdc_data.no_cyl;
806 geo->heads = private->rdc_data.trk_per_cyl;
807 return 0;
808}
809
810static struct dasd_ccw_req *
811dasd_eckd_format_device(struct dasd_device * device,
812 struct format_data_t * fdata)
813{
814 struct dasd_eckd_private *private;
815 struct dasd_ccw_req *fcp;
816 struct eckd_count *ect;
817 struct ccw1 *ccw;
818 void *data;
819 int rpt, cyl, head;
820 int cplength, datasize;
821 int i;
822
823 private = (struct dasd_eckd_private *) device->private;
824 rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
825 cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
826 head = fdata->start_unit % private->rdc_data.trk_per_cyl;
827
828 /* Sanity checks. */
829 if (fdata->start_unit >=
830 (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
831 DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
832 fdata->start_unit);
833 return ERR_PTR(-EINVAL);
834 }
835 if (fdata->start_unit > fdata->stop_unit) {
836 DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
837 fdata->start_unit);
838 return ERR_PTR(-EINVAL);
839 }
840 if (dasd_check_blocksize(fdata->blksize) != 0) {
841 DEV_MESSAGE(KERN_WARNING, device,
842 "Invalid blocksize %d...terminating!",
843 fdata->blksize);
844 return ERR_PTR(-EINVAL);
845 }
846
847 /*
848 * fdata->intensity is a bit string that tells us what to do:
849 * Bit 0: write record zero
850 * Bit 1: write home address, currently not supported
851 * Bit 2: invalidate tracks
852 * Bit 3: use OS/390 compatible disk layout (cdl)
853 * Only some bit combinations do make sense.
854 */
855 switch (fdata->intensity) {
856 case 0x00: /* Normal format */
857 case 0x08: /* Normal format, use cdl. */
858 cplength = 2 + rpt;
859 datasize = sizeof(struct DE_eckd_data) +
860 sizeof(struct LO_eckd_data) +
861 rpt * sizeof(struct eckd_count);
862 break;
863 case 0x01: /* Write record zero and format track. */
864 case 0x09: /* Write record zero and format track, use cdl. */
865 cplength = 3 + rpt;
866 datasize = sizeof(struct DE_eckd_data) +
867 sizeof(struct LO_eckd_data) +
868 sizeof(struct eckd_count) +
869 rpt * sizeof(struct eckd_count);
870 break;
871 case 0x04: /* Invalidate track. */
872 case 0x0c: /* Invalidate track, use cdl. */
873 cplength = 3;
874 datasize = sizeof(struct DE_eckd_data) +
875 sizeof(struct LO_eckd_data) +
876 sizeof(struct eckd_count);
877 break;
878 default:
879 DEV_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.",
880 fdata->intensity);
881 return ERR_PTR(-EINVAL);
882 }
883 /* Allocate the format ccw request. */
884 fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
885 cplength, datasize, device);
886 if (IS_ERR(fcp))
887 return fcp;
888
889 data = fcp->data;
890 ccw = fcp->cpaddr;
891
892 switch (fdata->intensity & ~0x08) {
893 case 0x00: /* Normal format. */
894 define_extent(ccw++, (struct DE_eckd_data *) data,
895 fdata->start_unit, fdata->start_unit,
896 DASD_ECKD_CCW_WRITE_CKD, device);
897 data += sizeof(struct DE_eckd_data);
898 ccw[-1].flags |= CCW_FLAG_CC;
899 locate_record(ccw++, (struct LO_eckd_data *) data,
900 fdata->start_unit, 0, rpt,
901 DASD_ECKD_CCW_WRITE_CKD, device,
902 fdata->blksize);
903 data += sizeof(struct LO_eckd_data);
904 break;
905 case 0x01: /* Write record zero + format track. */
906 define_extent(ccw++, (struct DE_eckd_data *) data,
907 fdata->start_unit, fdata->start_unit,
908 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
909 device);
910 data += sizeof(struct DE_eckd_data);
911 ccw[-1].flags |= CCW_FLAG_CC;
912 locate_record(ccw++, (struct LO_eckd_data *) data,
913 fdata->start_unit, 0, rpt + 1,
914 DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
915 device->bp_block);
916 data += sizeof(struct LO_eckd_data);
917 break;
918 case 0x04: /* Invalidate track. */
919 define_extent(ccw++, (struct DE_eckd_data *) data,
920 fdata->start_unit, fdata->start_unit,
921 DASD_ECKD_CCW_WRITE_CKD, device);
922 data += sizeof(struct DE_eckd_data);
923 ccw[-1].flags |= CCW_FLAG_CC;
924 locate_record(ccw++, (struct LO_eckd_data *) data,
925 fdata->start_unit, 0, 1,
926 DASD_ECKD_CCW_WRITE_CKD, device, 8);
927 data += sizeof(struct LO_eckd_data);
928 break;
929 }
930 if (fdata->intensity & 0x01) { /* write record zero */
931 ect = (struct eckd_count *) data;
932 data += sizeof(struct eckd_count);
933 ect->cyl = cyl;
934 ect->head = head;
935 ect->record = 0;
936 ect->kl = 0;
937 ect->dl = 8;
938 ccw[-1].flags |= CCW_FLAG_CC;
939 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
940 ccw->flags = CCW_FLAG_SLI;
941 ccw->count = 8;
942 ccw->cda = (__u32)(addr_t) ect;
943 ccw++;
944 }
945 if ((fdata->intensity & ~0x08) & 0x04) { /* erase track */
946 ect = (struct eckd_count *) data;
947 data += sizeof(struct eckd_count);
948 ect->cyl = cyl;
949 ect->head = head;
950 ect->record = 1;
951 ect->kl = 0;
952 ect->dl = 0;
953 ccw[-1].flags |= CCW_FLAG_CC;
954 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
955 ccw->flags = CCW_FLAG_SLI;
956 ccw->count = 8;
957 ccw->cda = (__u32)(addr_t) ect;
958 } else { /* write remaining records */
959 for (i = 0; i < rpt; i++) {
960 ect = (struct eckd_count *) data;
961 data += sizeof(struct eckd_count);
962 ect->cyl = cyl;
963 ect->head = head;
964 ect->record = i + 1;
965 ect->kl = 0;
966 ect->dl = fdata->blksize;
967 /* Check for special tracks 0-1 when formatting CDL */
968 if ((fdata->intensity & 0x08) &&
969 fdata->start_unit == 0) {
970 if (i < 3) {
971 ect->kl = 4;
972 ect->dl = sizes_trk0[i] - 4;
973 }
974 }
975 if ((fdata->intensity & 0x08) &&
976 fdata->start_unit == 1) {
977 ect->kl = 44;
978 ect->dl = LABEL_SIZE - 44;
979 }
980 ccw[-1].flags |= CCW_FLAG_CC;
981 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
982 ccw->flags = CCW_FLAG_SLI;
983 ccw->count = 8;
984 ccw->cda = (__u32)(addr_t) ect;
985 ccw++;
986 }
987 }
988 fcp->device = device;
989 fcp->retries = 2; /* set retry counter to enable ERP */
990 fcp->buildclk = get_clock();
991 fcp->status = DASD_CQR_FILLED;
992 return fcp;
993}
994
995static dasd_era_t
996dasd_eckd_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
997{
998 struct dasd_device *device = (struct dasd_device *) cqr->device;
999 struct ccw_device *cdev = device->cdev;
1000
1001 if (irb->scsw.cstat == 0x00 &&
1002 irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
1003 return dasd_era_none;
1004
1005 switch (cdev->id.cu_type) {
1006 case 0x3990:
1007 case 0x2105:
1008 case 0x2107:
1009 case 0x1750:
1010 return dasd_3990_erp_examine(cqr, irb);
1011 case 0x9343:
1012 return dasd_9343_erp_examine(cqr, irb);
1013 case 0x3880:
1014 default:
1015 DEV_MESSAGE(KERN_WARNING, device, "%s",
1016 "default (unknown CU type) - RECOVERABLE return");
1017 return dasd_era_recover;
1018 }
1019}
1020
1021static dasd_erp_fn_t
1022dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1023{
1024 struct dasd_device *device = (struct dasd_device *) cqr->device;
1025 struct ccw_device *cdev = device->cdev;
1026
1027 switch (cdev->id.cu_type) {
1028 case 0x3990:
1029 case 0x2105:
1030 case 0x2107:
1031 case 0x1750:
1032 return dasd_3990_erp_action;
1033 case 0x9343:
1034 case 0x3880:
1035 default:
1036 return dasd_default_erp_action;
1037 }
1038}
1039
1040static dasd_erp_fn_t
1041dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1042{
1043 return dasd_default_erp_postaction;
1044}
1045
1046static struct dasd_ccw_req *
1047dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
1048{
1049 struct dasd_eckd_private *private;
1050 unsigned long *idaws;
1051 struct LO_eckd_data *LO_data;
1052 struct dasd_ccw_req *cqr;
1053 struct ccw1 *ccw;
1054 struct bio *bio;
1055 struct bio_vec *bv;
1056 char *dst;
1057 unsigned int blksize, blk_per_trk, off;
1058 int count, cidaw, cplength, datasize;
1059 sector_t recid, first_rec, last_rec;
1060 sector_t first_trk, last_trk;
1061 unsigned int first_offs, last_offs;
1062 unsigned char cmd, rcmd;
1063 int i;
1064
1065 private = (struct dasd_eckd_private *) device->private;
1066 if (rq_data_dir(req) == READ)
1067 cmd = DASD_ECKD_CCW_READ_MT;
1068 else if (rq_data_dir(req) == WRITE)
1069 cmd = DASD_ECKD_CCW_WRITE_MT;
1070 else
1071 return ERR_PTR(-EINVAL);
1072 /* Calculate number of blocks/records per track. */
1073 blksize = device->bp_block;
1074 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1075 /* Calculate record id of first and last block. */
1076 first_rec = first_trk = req->sector >> device->s2b_shift;
1077 first_offs = sector_div(first_trk, blk_per_trk);
1078 last_rec = last_trk =
1079 (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
1080 last_offs = sector_div(last_trk, blk_per_trk);
1081 /* Check struct bio and count the number of blocks for the request. */
1082 count = 0;
1083 cidaw = 0;
1084 rq_for_each_bio(bio, req) {
1085 bio_for_each_segment(bv, bio, i) {
1086 if (bv->bv_len & (blksize - 1))
1087 /* Eckd can only do full blocks. */
1088 return ERR_PTR(-EINVAL);
1089 count += bv->bv_len >> (device->s2b_shift + 9);
347a8dc3 1090#if defined(CONFIG_64BIT)
1da177e4
LT		 1091 if (idal_is_needed (page_address(bv->bv_page),
1092 bv->bv_len))
1093 cidaw += bv->bv_len >> (device->s2b_shift + 9);
1094#endif
1095 }
1096 }
1097 /* Paranoia. */
1098 if (count != last_rec - first_rec + 1)
1099 return ERR_PTR(-EINVAL);
1100 /* 1x define extent + 1x locate record + number of blocks */
1101 cplength = 2 + count;
1102 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1103 datasize = sizeof(struct DE_eckd_data) + sizeof(struct LO_eckd_data) +
1104 cidaw * sizeof(unsigned long);
1105 /* Find out the number of additional locate record ccws for cdl. */
1106 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1107 if (last_rec >= 2*blk_per_trk)
1108 count = 2*blk_per_trk - first_rec;
1109 cplength += count;
1110 datasize += count*sizeof(struct LO_eckd_data);
1111 }
1112 /* Allocate the ccw request. */
1113 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1114 cplength, datasize, device);
1115 if (IS_ERR(cqr))
1116 return cqr;
1117 ccw = cqr->cpaddr;
1118 /* First ccw is define extent. */
1119 define_extent(ccw++, cqr->data, first_trk, last_trk, cmd, device);
1120 /* Build locate_record+read/write/ccws. */
1121 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_eckd_data));
1122 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1123 recid = first_rec;
1124 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1125 /* Only standard blocks so there is just one locate record. */
1126 ccw[-1].flags |= CCW_FLAG_CC;
1127 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1128 last_rec - recid + 1, cmd, device, blksize);
1129 }
1130 rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
1131 dst = page_address(bv->bv_page) + bv->bv_offset;
1132 if (dasd_page_cache) {
1133 char *copy = kmem_cache_alloc(dasd_page_cache,
1134 SLAB_DMA | __GFP_NOWARN);
1135 if (copy && rq_data_dir(req) == WRITE)
1136 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1137 if (copy)
1138 dst = copy + bv->bv_offset;
1139 }
1140 for (off = 0; off < bv->bv_len; off += blksize) {
1141 sector_t trkid = recid;
1142 unsigned int recoffs = sector_div(trkid, blk_per_trk);
1143 rcmd = cmd;
1144 count = blksize;
1145 /* Locate record for cdl special block ? */
1146 if (private->uses_cdl && recid < 2*blk_per_trk) {
1147 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1148 rcmd |= 0x8;
1149 count = dasd_eckd_cdl_reclen(recid);
ec5883ab
HH		 1150 if (count < blksize &&
1151 rq_data_dir(req) == READ)
1da177e4
LT		 1152 memset(dst + count, 0xe5,
1153 blksize - count);
1154 }
1155 ccw[-1].flags |= CCW_FLAG_CC;
1156 locate_record(ccw++, LO_data++,
1157 trkid, recoffs + 1,
1158 1, rcmd, device, count);
1159 }
1160 /* Locate record for standard blocks ? */
1161 if (private->uses_cdl && recid == 2*blk_per_trk) {
1162 ccw[-1].flags |= CCW_FLAG_CC;
1163 locate_record(ccw++, LO_data++,
1164 trkid, recoffs + 1,
1165 last_rec - recid + 1,
1166 cmd, device, count);
1167 }
1168 /* Read/write ccw. */
1169 ccw[-1].flags |= CCW_FLAG_CC;
1170 ccw->cmd_code = rcmd;
1171 ccw->count = count;
1172 if (idal_is_needed(dst, blksize)) {
1173 ccw->cda = (__u32)(addr_t) idaws;
1174 ccw->flags = CCW_FLAG_IDA;
1175 idaws = idal_create_words(idaws, dst, blksize);
1176 } else {
1177 ccw->cda = (__u32)(addr_t) dst;
1178 ccw->flags = 0;
1179 }
1180 ccw++;
1181 dst += blksize;
1182 recid++;
1183 }
1184 }
1c01b8a5
HH		 1185 if (req->flags & REQ_FAILFAST)
1186 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1da177e4
LT		 1187 cqr->device = device;
1188 cqr->expires = 5 * 60 * HZ; /* 5 minutes */
1189 cqr->lpm = private->path_data.ppm;
1190 cqr->retries = 256;
1191 cqr->buildclk = get_clock();
1192 cqr->status = DASD_CQR_FILLED;
1193 return cqr;
1194}
1195
1196static int
1197dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
1198{
1199 struct dasd_eckd_private *private;
1200 struct ccw1 *ccw;
1201 struct bio *bio;
1202 struct bio_vec *bv;
1203 char *dst, *cda;
1204 unsigned int blksize, blk_per_trk, off;
1205 sector_t recid;
1206 int i, status;
1207
1208 if (!dasd_page_cache)
1209 goto out;
1210 private = (struct dasd_eckd_private *) cqr->device->private;
1211 blksize = cqr->device->bp_block;
1212 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1213 recid = req->sector >> cqr->device->s2b_shift;
1214 ccw = cqr->cpaddr;
1215 /* Skip over define extent & locate record. */
1216 ccw++;
1217 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
1218 ccw++;
1219 rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
1220 dst = page_address(bv->bv_page) + bv->bv_offset;
1221 for (off = 0; off < bv->bv_len; off += blksize) {
1222 /* Skip locate record. */
1223 if (private->uses_cdl && recid <= 2*blk_per_trk)
1224 ccw++;
1225 if (dst) {
1226 if (ccw->flags & CCW_FLAG_IDA)
1227 cda = *((char **)((addr_t) ccw->cda));
1228 else
1229 cda = (char *)((addr_t) ccw->cda);
1230 if (dst != cda) {
1231 if (rq_data_dir(req) == READ)
1232 memcpy(dst, cda, bv->bv_len);
1233 kmem_cache_free(dasd_page_cache,
1234 (void *)((addr_t)cda & PAGE_MASK));
1235 }
1236 dst = NULL;
1237 }
1238 ccw++;
1239 recid++;
1240 }
1241 }
1242out:
1243 status = cqr->status == DASD_CQR_DONE;
1244 dasd_sfree_request(cqr, cqr->device);
1245 return status;
1246}
1247
1248static int
1249dasd_eckd_fill_info(struct dasd_device * device,
1250 struct dasd_information2_t * info)
1251{
1252 struct dasd_eckd_private *private;
1253
1254 private = (struct dasd_eckd_private *) device->private;
1255 info->label_block = 2;
1256 info->FBA_layout = private->uses_cdl ? 0 : 1;
1257 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
1258 info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
1259 memcpy(info->characteristics, &private->rdc_data,
1260 sizeof(struct dasd_eckd_characteristics));
1261 info->confdata_size = sizeof (struct dasd_eckd_confdata);
1262 memcpy(info->configuration_data, &private->conf_data,
1263 sizeof (struct dasd_eckd_confdata));
1264 return 0;
1265}
1266
1267/*
1268 * SECTION: ioctl functions for eckd devices.
1269 */
1270
1271/*
1272 * Release device ioctl.
1273 * Buils a channel programm to releases a prior reserved
1274 * (see dasd_eckd_reserve) device.
1275 */
1276static int
1107ccfb 1277dasd_eckd_release(struct dasd_device *device)
1da177e4 1278{
1da177e4
LT		 1279 struct dasd_ccw_req *cqr;
1280 int rc;
1281
1282 if (!capable(CAP_SYS_ADMIN))
1283 return -EACCES;
1284
1da177e4
LT		 1285 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1286 1, 32, device);
1287 if (IS_ERR(cqr)) {
1288 DEV_MESSAGE(KERN_WARNING, device, "%s",
1289 "Could not allocate initialization request");
1290 return PTR_ERR(cqr);
1291 }
1292 cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
1293 cqr->cpaddr->flags |= CCW_FLAG_SLI;
1294 cqr->cpaddr->count = 32;
1295 cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1296 cqr->device = device;
1297 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1c01b8a5 1298 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1da177e4
LT		 1299 cqr->retries = 0;
1300 cqr->expires = 2 * HZ;
1301 cqr->buildclk = get_clock();
1302 cqr->status = DASD_CQR_FILLED;
1303
1304 rc = dasd_sleep_on_immediatly(cqr);
1305
1306 dasd_sfree_request(cqr, cqr->device);
1307 return rc;
1308}
1309
1310/*
1311 * Reserve device ioctl.
1312 * Options are set to 'synchronous wait for interrupt' and
1313 * 'timeout the request'. This leads to a terminate IO if
1314 * the interrupt is outstanding for a certain time.
1315 */
1316static int
1107ccfb 1317dasd_eckd_reserve(struct dasd_device *device)
1da177e4 1318{
1da177e4
LT		 1319 struct dasd_ccw_req *cqr;
1320 int rc;
1321
1322 if (!capable(CAP_SYS_ADMIN))
1323 return -EACCES;
1324
1da177e4
LT		 1325 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1326 1, 32, device);
1327 if (IS_ERR(cqr)) {
1328 DEV_MESSAGE(KERN_WARNING, device, "%s",
1329 "Could not allocate initialization request");
1330 return PTR_ERR(cqr);
1331 }
1332 cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
1333 cqr->cpaddr->flags |= CCW_FLAG_SLI;
1334 cqr->cpaddr->count = 32;
1335 cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1336 cqr->device = device;
1337 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1c01b8a5 1338 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1da177e4
LT		 1339 cqr->retries = 0;
1340 cqr->expires = 2 * HZ;
1341 cqr->buildclk = get_clock();
1342 cqr->status = DASD_CQR_FILLED;
1343
1344 rc = dasd_sleep_on_immediatly(cqr);
1345
1346 dasd_sfree_request(cqr, cqr->device);
1347 return rc;
1348}
1349
1350/*
1351 * Steal lock ioctl - unconditional reserve device.
1352 * Buils a channel programm to break a device's reservation.
1353 * (unconditional reserve)
1354 */
1355static int
1107ccfb 1356dasd_eckd_steal_lock(struct dasd_device *device)
1da177e4 1357{
1da177e4
LT		 1358 struct dasd_ccw_req *cqr;
1359 int rc;
1360
1361 if (!capable(CAP_SYS_ADMIN))
1362 return -EACCES;
1363
1da177e4
LT		 1364 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1365 1, 32, device);
1366 if (IS_ERR(cqr)) {
1367 DEV_MESSAGE(KERN_WARNING, device, "%s",
1368 "Could not allocate initialization request");
1369 return PTR_ERR(cqr);
1370 }
1371 cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
1372 cqr->cpaddr->flags |= CCW_FLAG_SLI;
1373 cqr->cpaddr->count = 32;
1374 cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1375 cqr->device = device;
1376 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1c01b8a5 1377 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1da177e4
LT		 1378 cqr->retries = 0;
1379 cqr->expires = 2 * HZ;
1380 cqr->buildclk = get_clock();
1381 cqr->status = DASD_CQR_FILLED;
1382
1383 rc = dasd_sleep_on_immediatly(cqr);
1384
1385 dasd_sfree_request(cqr, cqr->device);
1386 return rc;
1387}
1388
1389/*
1390 * Read performance statistics
1391 */
1392static int
1107ccfb 1393dasd_eckd_performance(struct dasd_device *device, void __user *argp)
1da177e4 1394{
1da177e4
LT		 1395 struct dasd_psf_prssd_data *prssdp;
1396 struct dasd_rssd_perf_stats_t *stats;
1397 struct dasd_ccw_req *cqr;
1398 struct ccw1 *ccw;
1399 int rc;
1400
1da177e4
LT		 1401 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1402 1 /* PSF */ + 1 /* RSSD */ ,
1403 (sizeof (struct dasd_psf_prssd_data) +
1404 sizeof (struct dasd_rssd_perf_stats_t)),
1405 device);
1406 if (IS_ERR(cqr)) {
1407 DEV_MESSAGE(KERN_WARNING, device, "%s",
1408 "Could not allocate initialization request");
1409 return PTR_ERR(cqr);
1410 }
1411 cqr->device = device;
1412 cqr->retries = 0;
1413 cqr->expires = 10 * HZ;
1414
1415 /* Prepare for Read Subsystem Data */
1416 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1417 memset(prssdp, 0, sizeof (struct dasd_psf_prssd_data));
1418 prssdp->order = PSF_ORDER_PRSSD;
1419 prssdp->suborder = 0x01; /* Perfomance Statistics */
1420 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
1421
1422 ccw = cqr->cpaddr;
1423 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1424 ccw->count = sizeof (struct dasd_psf_prssd_data);
1425 ccw->flags |= CCW_FLAG_CC;
1426 ccw->cda = (__u32)(addr_t) prssdp;
1427
1428 /* Read Subsystem Data - Performance Statistics */
1429 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1430 memset(stats, 0, sizeof (struct dasd_rssd_perf_stats_t));
1431
1432 ccw++;
1433 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1434 ccw->count = sizeof (struct dasd_rssd_perf_stats_t);
1435 ccw->cda = (__u32)(addr_t) stats;
1436
1437 cqr->buildclk = get_clock();
1438 cqr->status = DASD_CQR_FILLED;
1439 rc = dasd_sleep_on(cqr);
1440 if (rc == 0) {
1441 /* Prepare for Read Subsystem Data */
1442 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1443 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1107ccfb
CH		 1444 if (copy_to_user(argp, stats,
1445 sizeof(struct dasd_rssd_perf_stats_t)))
1446 rc = -EFAULT;
1da177e4
LT		 1447 }
1448 dasd_sfree_request(cqr, cqr->device);
1449 return rc;
1450}
1451
1452/*
1453 * Get attributes (cache operations)
1454 * Returnes the cache attributes used in Define Extend (DE).
1455 */
1456static int
1107ccfb 1457dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
1da177e4 1458{
1107ccfb
CH		 1459 struct dasd_eckd_private *private =
1460 (struct dasd_eckd_private *)device->private;
1461 struct attrib_data_t attrib = private->attrib;
1da177e4
LT		 1462 int rc;
1463
1464 if (!capable(CAP_SYS_ADMIN))
1465 return -EACCES;
1107ccfb 1466 if (!argp)
1da177e4
LT		 1467 return -EINVAL;
1468
1107ccfb
CH		 1469 rc = 0;
1470 if (copy_to_user(argp, (long *) &attrib,
1471 sizeof (struct attrib_data_t)))
1472 rc = -EFAULT;
1da177e4
LT		 1473
1474 return rc;
1475}
1476
1477/*
1478 * Set attributes (cache operations)
1479 * Stores the attributes for cache operation to be used in Define Extend (DE).
1480 */
1481static int
1107ccfb 1482dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
1da177e4 1483{
1107ccfb
CH		 1484 struct dasd_eckd_private *private =
1485 (struct dasd_eckd_private *)device->private;
1da177e4
LT		 1486 struct attrib_data_t attrib;
1487
1488 if (!capable(CAP_SYS_ADMIN))
1489 return -EACCES;
1107ccfb 1490 if (!argp)
1da177e4
LT		 1491 return -EINVAL;
1492
1107ccfb 1493 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
1da177e4 1494 return -EFAULT;
1da177e4
LT		 1495 private->attrib = attrib;
1496
1497 DEV_MESSAGE(KERN_INFO, device,
1498 "cache operation mode set to %x (%i cylinder prestage)",
1499 private->attrib.operation, private->attrib.nr_cyl);
1500 return 0;
1501}
1502
1107ccfb
CH		 1503static int
1504dasd_eckd_ioctl(struct dasd_device *device, unsigned int cmd, void __user *argp)
1505{
1506 switch (cmd) {
1507 case BIODASDGATTR:
1508 return dasd_eckd_get_attrib(device, argp);
1509 case BIODASDSATTR:
1510 return dasd_eckd_set_attrib(device, argp);
1511 case BIODASDPSRD:
1512 return dasd_eckd_performance(device, argp);
1513 case BIODASDRLSE:
1514 return dasd_eckd_release(device);
1515 case BIODASDRSRV:
1516 return dasd_eckd_reserve(device);
1517 case BIODASDSLCK:
1518 return dasd_eckd_steal_lock(device);
1519 default:
1520 return -ENOIOCTLCMD;
1521 }
1522}
1523
1da177e4
LT		 1524/*
1525 * Print sense data and related channel program.
1526 * Parts are printed because printk buffer is only 1024 bytes.
1527 */
1528static void
1529dasd_eckd_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
1530 struct irb *irb)
1531{
1532 char *page;
1533 struct ccw1 *act, *end, *last;
1534 int len, sl, sct, count;
1535
1536 page = (char *) get_zeroed_page(GFP_ATOMIC);
1537 if (page == NULL) {
1538 DEV_MESSAGE(KERN_ERR, device, " %s",
1539 "No memory to dump sense data");
1540 return;
1541 }
1542 len = sprintf(page, KERN_ERR PRINTK_HEADER
1543 " I/O status report for device %s:\n",
1544 device->cdev->dev.bus_id);
1545 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1546 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
1547 irb->scsw.cstat, irb->scsw.dstat);
1548 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1549 " device %s: Failing CCW: %p\n",
1550 device->cdev->dev.bus_id,
1551 (void *) (addr_t) irb->scsw.cpa);
1552 if (irb->esw.esw0.erw.cons) {
1553 for (sl = 0; sl < 4; sl++) {
1554 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1555 " Sense(hex) %2d-%2d:",
1556 (8 * sl), ((8 * sl) + 7));
1557
1558 for (sct = 0; sct < 8; sct++) {
1559 len += sprintf(page + len, " %02x",
1560 irb->ecw[8 * sl + sct]);
1561 }
1562 len += sprintf(page + len, "\n");
1563 }
1564
1565 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
1566 /* 24 Byte Sense Data */
1567 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1568 " 24 Byte: %x MSG %x, "
1569 "%s MSGb to SYSOP\n",
1570 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
1571 irb->ecw[1] & 0x10 ? "" : "no");
1572 } else {
1573 /* 32 Byte Sense Data */
1574 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1575 " 32 Byte: Format: %x "
1576 "Exception class %x\n",
1577 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
1578 }
1579 } else {
1580 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1581 " SORRY - NO VALID SENSE AVAILABLE\n");
1582 }
1583 MESSAGE_LOG(KERN_ERR, "%s",
1584 page + sizeof(KERN_ERR PRINTK_HEADER));
1585
1586 /* dump the Channel Program */
1587 /* print first CCWs (maximum 8) */
1588 act = req->cpaddr;
1589 for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
1590 end = min(act + 8, last);
1591 len = sprintf(page, KERN_ERR PRINTK_HEADER
1592 " Related CP in req: %p\n", req);
1593 while (act <= end) {
1594 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1595 " CCW %p: %08X %08X DAT:",
1596 act, ((int *) act)[0], ((int *) act)[1]);
1597 for (count = 0; count < 32 && count < act->count;
1598 count += sizeof(int))
1599 len += sprintf(page + len, " %08X",
1600 ((int *) (addr_t) act->cda)
1601 [(count>>2)]);
1602 len += sprintf(page + len, "\n");
1603 act++;
1604 }
1605 MESSAGE_LOG(KERN_ERR, "%s",
1606 page + sizeof(KERN_ERR PRINTK_HEADER));
1607
1608 /* print failing CCW area */
1609 len = 0;
1610 if (act < ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
1611 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
1612 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
1613 }
1614 end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
1615 while (act <= end) {
1616 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1617 " CCW %p: %08X %08X DAT:",
1618 act, ((int *) act)[0], ((int *) act)[1]);
1619 for (count = 0; count < 32 && count < act->count;
1620 count += sizeof(int))
1621 len += sprintf(page + len, " %08X",
1622 ((int *) (addr_t) act->cda)
1623 [(count>>2)]);
1624 len += sprintf(page + len, "\n");
1625 act++;
1626 }
1627
1628 /* print last CCWs */
1629 if (act < last - 2) {
1630 act = last - 2;
1631 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
1632 }
1633 while (act <= last) {
1634 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1635 " CCW %p: %08X %08X DAT:",
1636 act, ((int *) act)[0], ((int *) act)[1]);
1637 for (count = 0; count < 32 && count < act->count;
1638 count += sizeof(int))
1639 len += sprintf(page + len, " %08X",
1640 ((int *) (addr_t) act->cda)
1641 [(count>>2)]);
1642 len += sprintf(page + len, "\n");
1643 act++;
1644 }
1645 if (len > 0)
1646 MESSAGE_LOG(KERN_ERR, "%s",
1647 page + sizeof(KERN_ERR PRINTK_HEADER));
1648 free_page((unsigned long) page);
1649}
1650
1651/*
1652 * max_blocks is dependent on the amount of storage that is available
1653 * in the static io buffer for each device. Currently each device has
1654 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
1655 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
1656 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
1657 * addition we have one define extent ccw + 16 bytes of data and one
1658 * locate record ccw + 16 bytes of data. That makes:
1659 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
1660 * We want to fit two into the available memory so that we can immediately
1661 * start the next request if one finishes off. That makes 249.5 blocks
1662 * for one request. Give a little safety and the result is 240.
1663 */
1664static struct dasd_discipline dasd_eckd_discipline = {
1665 .owner = THIS_MODULE,
1666 .name = "ECKD",
1667 .ebcname = "ECKD",
1668 .max_blocks = 240,
1669 .check_device = dasd_eckd_check_characteristics,
1670 .do_analysis = dasd_eckd_do_analysis,
1671 .fill_geometry = dasd_eckd_fill_geometry,
1672 .start_IO = dasd_start_IO,
1673 .term_IO = dasd_term_IO,
1674 .format_device = dasd_eckd_format_device,
1675 .examine_error = dasd_eckd_examine_error,
1676 .erp_action = dasd_eckd_erp_action,
1677 .erp_postaction = dasd_eckd_erp_postaction,
1678 .build_cp = dasd_eckd_build_cp,
1679 .free_cp = dasd_eckd_free_cp,
1680 .dump_sense = dasd_eckd_dump_sense,
1681 .fill_info = dasd_eckd_fill_info,
1107ccfb 1682 .ioctl = dasd_eckd_ioctl,
1da177e4
LT		 1683};
1684
1685static int __init
1686dasd_eckd_init(void)
1687{
1688 int ret;
1689
1da177e4
LT		 1690 ASCEBC(dasd_eckd_discipline.ebcname, 4);
1691
1692 ret = ccw_driver_register(&dasd_eckd_driver);
1107ccfb
CH		 1693 if (!ret)
1694 dasd_generic_auto_online(&dasd_eckd_driver);
1695 return ret;
1da177e4
LT		 1696}
1697
1698static void __exit
1699dasd_eckd_cleanup(void)
1700{
1701 ccw_driver_unregister(&dasd_eckd_driver);
1da177e4
LT		 1702}
1703
1704module_init(dasd_eckd_init);
1705module_exit(dasd_eckd_cleanup);
1706
1707/*
1708 * Overrides for Emacs so that we follow Linus's tabbing style.
1709 * Emacs will notice this stuff at the end of the file and automatically
1710 * adjust the settings for this buffer only. This must remain at the end
1711 * of the file.
1712 * ---------------------------------------------------------------------------
1713 * Local variables:
1714 * c-indent-level: 4
1715 * c-brace-imaginary-offset: 0
1716 * c-brace-offset: -4
1717 * c-argdecl-indent: 4
1718 * c-label-offset: -4
1719 * c-continued-statement-offset: 4
1720 * c-continued-brace-offset: 0
1721 * indent-tabs-mode: 1
1722 * tab-width: 8
1723 * End:
1724 */
Linux 6.x block layer and io_uring tree(s)