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V4L/DVB (6715): ivtv: Remove unnecessary register update
[linux-2.6/verdex.git] / drivers / s390 / block / dasd_eckd.c
blob44adf8496bda6e238f3ca106a5bf804f96f64ecc
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 *
10 */
11
12 #include <linux/stddef.h>
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/hdreg.h> /* HDIO_GETGEO */
16 #include <linux/bio.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19
20 #include <asm/debug.h>
21 #include <asm/idals.h>
22 #include <asm/ebcdic.h>
23 #include <asm/io.h>
24 #include <asm/todclk.h>
25 #include <asm/uaccess.h>
26 #include <asm/cio.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
51 MODULE_LICENSE("GPL");
52
53 static struct dasd_discipline dasd_eckd_discipline;
54
55 struct 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 */
67 static 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
81 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
82
83 static 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 */
87 static int
88 dasd_eckd_probe (struct ccw_device *cdev)
89 {
90 int ret;
91
92 /* set ECKD specific ccw-device options */
93 ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE);
94 if (ret) {
95 printk(KERN_WARNING
96 "dasd_eckd_probe: could not set ccw-device options "
97 "for %s\n", cdev->dev.bus_id);
98 return ret;
99 }
100 ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
101 return ret;
102 }
103
104 static int
105 dasd_eckd_set_online(struct ccw_device *cdev)
106 {
107 return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
108 }
109
110 static struct ccw_driver dasd_eckd_driver = {
111 .name = "dasd-eckd",
112 .owner = THIS_MODULE,
113 .ids = dasd_eckd_ids,
114 .probe = dasd_eckd_probe,
115 .remove = dasd_generic_remove,
116 .set_offline = dasd_generic_set_offline,
117 .set_online = dasd_eckd_set_online,
118 .notify = dasd_generic_notify,
119 };
120
121 static const int sizes_trk0[] = { 28, 148, 84 };
122 #define LABEL_SIZE 140
123
124 static inline unsigned int
125 round_up_multiple(unsigned int no, unsigned int mult)
126 {
127 int rem = no % mult;
128 return (rem ? no - rem + mult : no);
129 }
130
131 static inline unsigned int
132 ceil_quot(unsigned int d1, unsigned int d2)
133 {
134 return (d1 + (d2 - 1)) / d2;
135 }
136
137 static unsigned int
138 recs_per_track(struct dasd_eckd_characteristics * rdc,
139 unsigned int kl, unsigned int dl)
140 {
141 int dn, kn;
142
143 switch (rdc->dev_type) {
144 case 0x3380:
145 if (kl)
146 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
147 ceil_quot(dl + 12, 32));
148 else
149 return 1499 / (15 + ceil_quot(dl + 12, 32));
150 case 0x3390:
151 dn = ceil_quot(dl + 6, 232) + 1;
152 if (kl) {
153 kn = ceil_quot(kl + 6, 232) + 1;
154 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
155 9 + ceil_quot(dl + 6 * dn, 34));
156 } else
157 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
158 case 0x9345:
159 dn = ceil_quot(dl + 6, 232) + 1;
160 if (kl) {
161 kn = ceil_quot(kl + 6, 232) + 1;
162 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
163 ceil_quot(dl + 6 * dn, 34));
164 } else
165 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
166 }
167 return 0;
168 }
169
170 static int
171 check_XRC (struct ccw1 *de_ccw,
172 struct DE_eckd_data *data,
173 struct dasd_device *device)
174 {
175 struct dasd_eckd_private *private;
176 int rc;
177
178 private = (struct dasd_eckd_private *) device->private;
179 if (!private->rdc_data.facilities.XRC_supported)
180 return 0;
181
182 /* switch on System Time Stamp - needed for XRC Support */
183 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
184 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
185
186 rc = get_sync_clock(&data->ep_sys_time);
187 /* Ignore return code if sync clock is switched off. */
188 if (rc == -ENOSYS || rc == -EACCES)
189 rc = 0;
190
191 de_ccw->count = sizeof (struct DE_eckd_data);
192 de_ccw->flags |= CCW_FLAG_SLI;
193 return rc;
194 }
195
196 static int
197 define_extent(struct ccw1 * ccw, struct DE_eckd_data * data, int trk,
198 int totrk, int cmd, struct dasd_device * device)
199 {
200 struct dasd_eckd_private *private;
201 struct ch_t geo, beg, end;
202 int rc = 0;
203
204 private = (struct dasd_eckd_private *) device->private;
205
206 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
207 ccw->flags = 0;
208 ccw->count = 16;
209 ccw->cda = (__u32) __pa(data);
210
211 memset(data, 0, sizeof (struct DE_eckd_data));
212 switch (cmd) {
213 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
214 case DASD_ECKD_CCW_READ_RECORD_ZERO:
215 case DASD_ECKD_CCW_READ:
216 case DASD_ECKD_CCW_READ_MT:
217 case DASD_ECKD_CCW_READ_CKD:
218 case DASD_ECKD_CCW_READ_CKD_MT:
219 case DASD_ECKD_CCW_READ_KD:
220 case DASD_ECKD_CCW_READ_KD_MT:
221 case DASD_ECKD_CCW_READ_COUNT:
222 data->mask.perm = 0x1;
223 data->attributes.operation = private->attrib.operation;
224 break;
225 case DASD_ECKD_CCW_WRITE:
226 case DASD_ECKD_CCW_WRITE_MT:
227 case DASD_ECKD_CCW_WRITE_KD:
228 case DASD_ECKD_CCW_WRITE_KD_MT:
229 data->mask.perm = 0x02;
230 data->attributes.operation = private->attrib.operation;
231 rc = check_XRC (ccw, data, device);
232 break;
233 case DASD_ECKD_CCW_WRITE_CKD:
234 case DASD_ECKD_CCW_WRITE_CKD_MT:
235 data->attributes.operation = DASD_BYPASS_CACHE;
236 rc = check_XRC (ccw, data, device);
237 break;
238 case DASD_ECKD_CCW_ERASE:
239 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
240 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
241 data->mask.perm = 0x3;
242 data->mask.auth = 0x1;
243 data->attributes.operation = DASD_BYPASS_CACHE;
244 rc = check_XRC (ccw, data, device);
245 break;
246 default:
247 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
248 break;
249 }
250
251 data->attributes.mode = 0x3; /* ECKD */
252
253 if ((private->rdc_data.cu_type == 0x2105 ||
254 private->rdc_data.cu_type == 0x2107 ||
255 private->rdc_data.cu_type == 0x1750)
256 && !(private->uses_cdl && trk < 2))
257 data->ga_extended |= 0x40; /* Regular Data Format Mode */
258
259 geo.cyl = private->rdc_data.no_cyl;
260 geo.head = private->rdc_data.trk_per_cyl;
261 beg.cyl = trk / geo.head;
262 beg.head = trk % geo.head;
263 end.cyl = totrk / geo.head;
264 end.head = totrk % geo.head;
265
266 /* check for sequential prestage - enhance cylinder range */
267 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
268 data->attributes.operation == DASD_SEQ_ACCESS) {
269
270 if (end.cyl + private->attrib.nr_cyl < geo.cyl)
271 end.cyl += private->attrib.nr_cyl;
272 else
273 end.cyl = (geo.cyl - 1);
274 }
275
276 data->beg_ext.cyl = beg.cyl;
277 data->beg_ext.head = beg.head;
278 data->end_ext.cyl = end.cyl;
279 data->end_ext.head = end.head;
280 return rc;
281 }
282
283 static void
284 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, int trk,
285 int rec_on_trk, int no_rec, int cmd,
286 struct dasd_device * device, int reclen)
287 {
288 struct dasd_eckd_private *private;
289 int sector;
290 int dn, d;
291
292 private = (struct dasd_eckd_private *) device->private;
293
294 DBF_DEV_EVENT(DBF_INFO, device,
295 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
296 trk, rec_on_trk, no_rec, cmd, reclen);
297
298 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
299 ccw->flags = 0;
300 ccw->count = 16;
301 ccw->cda = (__u32) __pa(data);
302
303 memset(data, 0, sizeof (struct LO_eckd_data));
304 sector = 0;
305 if (rec_on_trk) {
306 switch (private->rdc_data.dev_type) {
307 case 0x3390:
308 dn = ceil_quot(reclen + 6, 232);
309 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
310 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
311 break;
312 case 0x3380:
313 d = 7 + ceil_quot(reclen + 12, 32);
314 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
315 break;
316 }
317 }
318 data->sector = sector;
319 data->count = no_rec;
320 switch (cmd) {
321 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
322 data->operation.orientation = 0x3;
323 data->operation.operation = 0x03;
324 break;
325 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
326 data->operation.orientation = 0x3;
327 data->operation.operation = 0x16;
328 break;
329 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
330 data->operation.orientation = 0x1;
331 data->operation.operation = 0x03;
332 data->count++;
333 break;
334 case DASD_ECKD_CCW_READ_RECORD_ZERO:
335 data->operation.orientation = 0x3;
336 data->operation.operation = 0x16;
337 data->count++;
338 break;
339 case DASD_ECKD_CCW_WRITE:
340 case DASD_ECKD_CCW_WRITE_MT:
341 case DASD_ECKD_CCW_WRITE_KD:
342 case DASD_ECKD_CCW_WRITE_KD_MT:
343 data->auxiliary.last_bytes_used = 0x1;
344 data->length = reclen;
345 data->operation.operation = 0x01;
346 break;
347 case DASD_ECKD_CCW_WRITE_CKD:
348 case DASD_ECKD_CCW_WRITE_CKD_MT:
349 data->auxiliary.last_bytes_used = 0x1;
350 data->length = reclen;
351 data->operation.operation = 0x03;
352 break;
353 case DASD_ECKD_CCW_READ:
354 case DASD_ECKD_CCW_READ_MT:
355 case DASD_ECKD_CCW_READ_KD:
356 case DASD_ECKD_CCW_READ_KD_MT:
357 data->auxiliary.last_bytes_used = 0x1;
358 data->length = reclen;
359 data->operation.operation = 0x06;
360 break;
361 case DASD_ECKD_CCW_READ_CKD:
362 case DASD_ECKD_CCW_READ_CKD_MT:
363 data->auxiliary.last_bytes_used = 0x1;
364 data->length = reclen;
365 data->operation.operation = 0x16;
366 break;
367 case DASD_ECKD_CCW_READ_COUNT:
368 data->operation.operation = 0x06;
369 break;
370 case DASD_ECKD_CCW_ERASE:
371 data->length = reclen;
372 data->auxiliary.last_bytes_used = 0x1;
373 data->operation.operation = 0x0b;
374 break;
375 default:
376 DEV_MESSAGE(KERN_ERR, device, "unknown opcode 0x%x", cmd);
377 }
378 data->seek_addr.cyl = data->search_arg.cyl =
379 trk / private->rdc_data.trk_per_cyl;
380 data->seek_addr.head = data->search_arg.head =
381 trk % private->rdc_data.trk_per_cyl;
382 data->search_arg.record = rec_on_trk;
383 }
384
385 /*
386 * Returns 1 if the block is one of the special blocks that needs
387 * to get read/written with the KD variant of the command.
388 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
389 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
390 * Luckily the KD variants differ only by one bit (0x08) from the
391 * normal variant. So don't wonder about code like:
392 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
393 * ccw->cmd_code |= 0x8;
394 */
395 static inline int
396 dasd_eckd_cdl_special(int blk_per_trk, int recid)
397 {
398 if (recid < 3)
399 return 1;
400 if (recid < blk_per_trk)
401 return 0;
402 if (recid < 2 * blk_per_trk)
403 return 1;
404 return 0;
405 }
406
407 /*
408 * Returns the record size for the special blocks of the cdl format.
409 * Only returns something useful if dasd_eckd_cdl_special is true
410 * for the recid.
411 */
412 static inline int
413 dasd_eckd_cdl_reclen(int recid)
414 {
415 if (recid < 3)
416 return sizes_trk0[recid];
417 return LABEL_SIZE;
418 }
419
420 /*
421 * Generate device unique id that specifies the physical device.
422 */
423 static int
424 dasd_eckd_generate_uid(struct dasd_device *device, struct dasd_uid *uid)
425 {
426 struct dasd_eckd_private *private;
427 struct dasd_eckd_confdata *confdata;
428
429 private = (struct dasd_eckd_private *) device->private;
430 if (!private)
431 return -ENODEV;
432 confdata = &private->conf_data;
433 if (!confdata)
434 return -ENODEV;
435
436 memset(uid, 0, sizeof(struct dasd_uid));
437 memcpy(uid->vendor, confdata->ned1.HDA_manufacturer,
438 sizeof(uid->vendor) - 1);
439 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
440 memcpy(uid->serial, confdata->ned1.HDA_location,
441 sizeof(uid->serial) - 1);
442 EBCASC(uid->serial, sizeof(uid->serial) - 1);
443 uid->ssid = confdata->neq.subsystemID;
444 if (confdata->ned2.sneq.flags == 0x40) {
445 uid->alias = 1;
446 uid->unit_addr = confdata->ned2.sneq.base_unit_addr;
447 } else
448 uid->unit_addr = confdata->ned1.unit_addr;
449
450 return 0;
451 }
452
453 static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
454 void *rcd_buffer,
455 struct ciw *ciw, __u8 lpm)
456 {
457 struct dasd_ccw_req *cqr;
458 struct ccw1 *ccw;
459
460 cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
461
462 if (IS_ERR(cqr)) {
463 DEV_MESSAGE(KERN_WARNING, device, "%s",
464 "Could not allocate RCD request");
465 return cqr;
466 }
467
468 ccw = cqr->cpaddr;
469 ccw->cmd_code = ciw->cmd;
470 ccw->cda = (__u32)(addr_t)rcd_buffer;
471 ccw->count = ciw->count;
472
473 cqr->device = device;
474 cqr->expires = 10*HZ;
475 cqr->lpm = lpm;
476 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
477 cqr->retries = 2;
478 cqr->buildclk = get_clock();
479 cqr->status = DASD_CQR_FILLED;
480 return cqr;
481 }
482
483 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
484 void **rcd_buffer,
485 int *rcd_buffer_size, __u8 lpm)
486 {
487 struct ciw *ciw;
488 char *rcd_buf = NULL;
489 int ret;
490 struct dasd_ccw_req *cqr;
491
492 /*
493 * scan for RCD command in extended SenseID data
494 */
495 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
496 if (!ciw || ciw->cmd == 0) {
497 ret = -EOPNOTSUPP;
498 goto out_error;
499 }
500 rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
501 if (!rcd_buf) {
502 ret = -ENOMEM;
503 goto out_error;
504 }
505 cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
506 if (IS_ERR(cqr)) {
507 ret = PTR_ERR(cqr);
508 goto out_error;
509 }
510 ret = dasd_sleep_on(cqr);
511 /*
512 * on success we update the user input parms
513 */
514 dasd_sfree_request(cqr, cqr->device);
515 if (ret)
516 goto out_error;
517
518 *rcd_buffer_size = ciw->count;
519 *rcd_buffer = rcd_buf;
520 return 0;
521 out_error:
522 kfree(rcd_buf);
523 *rcd_buffer = NULL;
524 *rcd_buffer_size = 0;
525 return ret;
526 }
527
528 static int
529 dasd_eckd_read_conf(struct dasd_device *device)
530 {
531 void *conf_data;
532 int conf_len, conf_data_saved;
533 int rc;
534 __u8 lpm;
535 struct dasd_eckd_private *private;
536 struct dasd_eckd_path *path_data;
537
538 private = (struct dasd_eckd_private *) device->private;
539 path_data = (struct dasd_eckd_path *) &private->path_data;
540 path_data->opm = ccw_device_get_path_mask(device->cdev);
541 lpm = 0x80;
542 conf_data_saved = 0;
543
544 /* get configuration data per operational path */
545 for (lpm = 0x80; lpm; lpm>>= 1) {
546 if (lpm & path_data->opm){
547 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
548 &conf_len, lpm);
549 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
550 MESSAGE(KERN_WARNING,
551 "Read configuration data returned "
552 "error %d", rc);
553 return rc;
554 }
555 if (conf_data == NULL) {
556 MESSAGE(KERN_WARNING, "%s", "No configuration "
557 "data retrieved");
558 continue; /* no error */
559 }
560 if (conf_len != sizeof (struct dasd_eckd_confdata)) {
561 MESSAGE(KERN_WARNING,
562 "sizes of configuration data mismatch"
563 "%d (read) vs %ld (expected)",
564 conf_len,
565 sizeof (struct dasd_eckd_confdata));
566 kfree(conf_data);
567 continue; /* no error */
568 }
569 /* save first valid configuration data */
570 if (!conf_data_saved){
571 memcpy(&private->conf_data, conf_data,
572 sizeof (struct dasd_eckd_confdata));
573 conf_data_saved++;
574 }
575 switch (((char *)conf_data)[242] & 0x07){
576 case 0x02:
577 path_data->npm |= lpm;
578 break;
579 case 0x03:
580 path_data->ppm |= lpm;
581 break;
582 }
583 kfree(conf_data);
584 }
585 }
586 return 0;
587 }
588
589 /*
590 * Build CP for Perform Subsystem Function - SSC.
591 */
592 static struct dasd_ccw_req *
593 dasd_eckd_build_psf_ssc(struct dasd_device *device)
594 {
595 struct dasd_ccw_req *cqr;
596 struct dasd_psf_ssc_data *psf_ssc_data;
597 struct ccw1 *ccw;
598
599 cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
600 sizeof(struct dasd_psf_ssc_data),
601 device);
602
603 if (IS_ERR(cqr)) {
604 DEV_MESSAGE(KERN_WARNING, device, "%s",
605 "Could not allocate PSF-SSC request");
606 return cqr;
607 }
608 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
609 psf_ssc_data->order = PSF_ORDER_SSC;
610 psf_ssc_data->suborder = 0x08;
611
612 ccw = cqr->cpaddr;
613 ccw->cmd_code = DASD_ECKD_CCW_PSF;
614 ccw->cda = (__u32)(addr_t)psf_ssc_data;
615 ccw->count = 66;
616
617 cqr->device = device;
618 cqr->expires = 10*HZ;
619 cqr->buildclk = get_clock();
620 cqr->status = DASD_CQR_FILLED;
621 return cqr;
622 }
623
624 /*
625 * Perform Subsystem Function.
626 * It is necessary to trigger CIO for channel revalidation since this
627 * call might change behaviour of DASD devices.
628 */
629 static int
630 dasd_eckd_psf_ssc(struct dasd_device *device)
631 {
632 struct dasd_ccw_req *cqr;
633 int rc;
634
635 cqr = dasd_eckd_build_psf_ssc(device);
636 if (IS_ERR(cqr))
637 return PTR_ERR(cqr);
638
639 rc = dasd_sleep_on(cqr);
640 if (!rc)
641 /* trigger CIO to reprobe devices */
642 css_schedule_reprobe();
643 dasd_sfree_request(cqr, cqr->device);
644 return rc;
645 }
646
647 /*
648 * Valide storage server of current device.
649 */
650 static int
651 dasd_eckd_validate_server(struct dasd_device *device, struct dasd_uid *uid)
652 {
653 int rc;
654
655 /* Currently PAV is the only reason to 'validate' server on LPAR */
656 if (dasd_nopav || MACHINE_IS_VM)
657 return 0;
658
659 rc = dasd_eckd_psf_ssc(device);
660 /* may be requested feature is not available on server,
661 * therefore just report error and go ahead */
662 DEV_MESSAGE(KERN_INFO, device,
663 "PSF-SSC on storage subsystem %s.%s.%04x returned rc=%d",
664 uid->vendor, uid->serial, uid->ssid, rc);
665 /* RE-Read Configuration Data */
666 return dasd_eckd_read_conf(device);
667 }
668
669 /*
670 * Check device characteristics.
671 * If the device is accessible using ECKD discipline, the device is enabled.
672 */
673 static int
674 dasd_eckd_check_characteristics(struct dasd_device *device)
675 {
676 struct dasd_eckd_private *private;
677 struct dasd_uid uid;
678 void *rdc_data;
679 int rc;
680
681 private = (struct dasd_eckd_private *) device->private;
682 if (private == NULL) {
683 private = kzalloc(sizeof(struct dasd_eckd_private),
684 GFP_KERNEL | GFP_DMA);
685 if (private == NULL) {
686 DEV_MESSAGE(KERN_WARNING, device, "%s",
687 "memory allocation failed for private "
688 "data");
689 return -ENOMEM;
690 }
691 device->private = (void *) private;
692 }
693 /* Invalidate status of initial analysis. */
694 private->init_cqr_status = -1;
695 /* Set default cache operations. */
696 private->attrib.operation = DASD_NORMAL_CACHE;
697 private->attrib.nr_cyl = 0;
698
699 /* Read Configuration Data */
700 rc = dasd_eckd_read_conf(device);
701 if (rc)
702 return rc;
703
704 /* Generate device unique id and register in devmap */
705 rc = dasd_eckd_generate_uid(device, &uid);
706 if (rc)
707 return rc;
708 rc = dasd_set_uid(device->cdev, &uid);
709 if (rc == 1) /* new server found */
710 rc = dasd_eckd_validate_server(device, &uid);
711 if (rc)
712 return rc;
713
714 /* Read Device Characteristics */
715 rdc_data = (void *) &(private->rdc_data);
716 memset(rdc_data, 0, sizeof(rdc_data));
717 rc = dasd_generic_read_dev_chars(device, "ECKD", &rdc_data, 64);
718 if (rc)
719 DEV_MESSAGE(KERN_WARNING, device,
720 "Read device characteristics returned "
721 "rc=%d", rc);
722
723 DEV_MESSAGE(KERN_INFO, device,
724 "%04X/%02X(CU:%04X/%02X) Cyl:%d Head:%d Sec:%d",
725 private->rdc_data.dev_type,
726 private->rdc_data.dev_model,
727 private->rdc_data.cu_type,
728 private->rdc_data.cu_model.model,
729 private->rdc_data.no_cyl,
730 private->rdc_data.trk_per_cyl,
731 private->rdc_data.sec_per_trk);
732 return rc;
733 }
734
735 static struct dasd_ccw_req *
736 dasd_eckd_analysis_ccw(struct dasd_device *device)
737 {
738 struct dasd_eckd_private *private;
739 struct eckd_count *count_data;
740 struct LO_eckd_data *LO_data;
741 struct dasd_ccw_req *cqr;
742 struct ccw1 *ccw;
743 int cplength, datasize;
744 int i;
745
746 private = (struct dasd_eckd_private *) device->private;
747
748 cplength = 8;
749 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
750 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
751 cplength, datasize, device);
752 if (IS_ERR(cqr))
753 return cqr;
754 ccw = cqr->cpaddr;
755 /* Define extent for the first 3 tracks. */
756 define_extent(ccw++, cqr->data, 0, 2,
757 DASD_ECKD_CCW_READ_COUNT, device);
758 LO_data = cqr->data + sizeof (struct DE_eckd_data);
759 /* Locate record for the first 4 records on track 0. */
760 ccw[-1].flags |= CCW_FLAG_CC;
761 locate_record(ccw++, LO_data++, 0, 0, 4,
762 DASD_ECKD_CCW_READ_COUNT, device, 0);
763
764 count_data = private->count_area;
765 for (i = 0; i < 4; i++) {
766 ccw[-1].flags |= CCW_FLAG_CC;
767 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
768 ccw->flags = 0;
769 ccw->count = 8;
770 ccw->cda = (__u32)(addr_t) count_data;
771 ccw++;
772 count_data++;
773 }
774
775 /* Locate record for the first record on track 2. */
776 ccw[-1].flags |= CCW_FLAG_CC;
777 locate_record(ccw++, LO_data++, 2, 0, 1,
778 DASD_ECKD_CCW_READ_COUNT, device, 0);
779 /* Read count ccw. */
780 ccw[-1].flags |= CCW_FLAG_CC;
781 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
782 ccw->flags = 0;
783 ccw->count = 8;
784 ccw->cda = (__u32)(addr_t) count_data;
785
786 cqr->device = device;
787 cqr->retries = 0;
788 cqr->buildclk = get_clock();
789 cqr->status = DASD_CQR_FILLED;
790 return cqr;
791 }
792
793 /*
794 * This is the callback function for the init_analysis cqr. It saves
795 * the status of the initial analysis ccw before it frees it and kicks
796 * the device to continue the startup sequence. This will call
797 * dasd_eckd_do_analysis again (if the devices has not been marked
798 * for deletion in the meantime).
799 */
800 static void
801 dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr, void *data)
802 {
803 struct dasd_eckd_private *private;
804 struct dasd_device *device;
805
806 device = init_cqr->device;
807 private = (struct dasd_eckd_private *) device->private;
808 private->init_cqr_status = init_cqr->status;
809 dasd_sfree_request(init_cqr, device);
810 dasd_kick_device(device);
811 }
812
813 static int
814 dasd_eckd_start_analysis(struct dasd_device *device)
815 {
816 struct dasd_eckd_private *private;
817 struct dasd_ccw_req *init_cqr;
818
819 private = (struct dasd_eckd_private *) device->private;
820 init_cqr = dasd_eckd_analysis_ccw(device);
821 if (IS_ERR(init_cqr))
822 return PTR_ERR(init_cqr);
823 init_cqr->callback = dasd_eckd_analysis_callback;
824 init_cqr->callback_data = NULL;
825 init_cqr->expires = 5*HZ;
826 dasd_add_request_head(init_cqr);
827 return -EAGAIN;
828 }
829
830 static int
831 dasd_eckd_end_analysis(struct dasd_device *device)
832 {
833 struct dasd_eckd_private *private;
834 struct eckd_count *count_area;
835 unsigned int sb, blk_per_trk;
836 int status, i;
837
838 private = (struct dasd_eckd_private *) device->private;
839 status = private->init_cqr_status;
840 private->init_cqr_status = -1;
841 if (status != DASD_CQR_DONE) {
842 DEV_MESSAGE(KERN_WARNING, device, "%s",
843 "volume analysis returned unformatted disk");
844 return -EMEDIUMTYPE;
845 }
846
847 private->uses_cdl = 1;
848 /* Calculate number of blocks/records per track. */
849 blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
850 /* Check Track 0 for Compatible Disk Layout */
851 count_area = NULL;
852 for (i = 0; i < 3; i++) {
853 if (private->count_area[i].kl != 4 ||
854 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
855 private->uses_cdl = 0;
856 break;
857 }
858 }
859 if (i == 3)
860 count_area = &private->count_area[4];
861
862 if (private->uses_cdl == 0) {
863 for (i = 0; i < 5; i++) {
864 if ((private->count_area[i].kl != 0) ||
865 (private->count_area[i].dl !=
866 private->count_area[0].dl))
867 break;
868 }
869 if (i == 5)
870 count_area = &private->count_area[0];
871 } else {
872 if (private->count_area[3].record == 1)
873 DEV_MESSAGE(KERN_WARNING, device, "%s",
874 "Trk 0: no records after VTOC!");
875 }
876 if (count_area != NULL && count_area->kl == 0) {
877 /* we found notthing violating our disk layout */
878 if (dasd_check_blocksize(count_area->dl) == 0)
879 device->bp_block = count_area->dl;
880 }
881 if (device->bp_block == 0) {
882 DEV_MESSAGE(KERN_WARNING, device, "%s",
883 "Volume has incompatible disk layout");
884 return -EMEDIUMTYPE;
885 }
886 device->s2b_shift = 0; /* bits to shift 512 to get a block */
887 for (sb = 512; sb < device->bp_block; sb = sb << 1)
888 device->s2b_shift++;
889
890 blk_per_trk = recs_per_track(&private->rdc_data, 0, device->bp_block);
891 device->blocks = (private->rdc_data.no_cyl *
892 private->rdc_data.trk_per_cyl *
893 blk_per_trk);
894
895 DEV_MESSAGE(KERN_INFO, device,
896 "(%dkB blks): %dkB at %dkB/trk %s",
897 (device->bp_block >> 10),
898 ((private->rdc_data.no_cyl *
899 private->rdc_data.trk_per_cyl *
900 blk_per_trk * (device->bp_block >> 9)) >> 1),
901 ((blk_per_trk * device->bp_block) >> 10),
902 private->uses_cdl ?
903 "compatible disk layout" : "linux disk layout");
904
905 return 0;
906 }
907
908 static int
909 dasd_eckd_do_analysis(struct dasd_device *device)
910 {
911 struct dasd_eckd_private *private;
912
913 private = (struct dasd_eckd_private *) device->private;
914 if (private->init_cqr_status < 0)
915 return dasd_eckd_start_analysis(device);
916 else
917 return dasd_eckd_end_analysis(device);
918 }
919
920 static int
921 dasd_eckd_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
922 {
923 struct dasd_eckd_private *private;
924
925 private = (struct dasd_eckd_private *) device->private;
926 if (dasd_check_blocksize(device->bp_block) == 0) {
927 geo->sectors = recs_per_track(&private->rdc_data,
928 0, device->bp_block);
929 }
930 geo->cylinders = private->rdc_data.no_cyl;
931 geo->heads = private->rdc_data.trk_per_cyl;
932 return 0;
933 }
934
935 static struct dasd_ccw_req *
936 dasd_eckd_format_device(struct dasd_device * device,
937 struct format_data_t * fdata)
938 {
939 struct dasd_eckd_private *private;
940 struct dasd_ccw_req *fcp;
941 struct eckd_count *ect;
942 struct ccw1 *ccw;
943 void *data;
944 int rpt, cyl, head;
945 int cplength, datasize;
946 int i;
947
948 private = (struct dasd_eckd_private *) device->private;
949 rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
950 cyl = fdata->start_unit / private->rdc_data.trk_per_cyl;
951 head = fdata->start_unit % private->rdc_data.trk_per_cyl;
952
953 /* Sanity checks. */
954 if (fdata->start_unit >=
955 (private->rdc_data.no_cyl * private->rdc_data.trk_per_cyl)) {
956 DEV_MESSAGE(KERN_INFO, device, "Track no %d too big!",
957 fdata->start_unit);
958 return ERR_PTR(-EINVAL);
959 }
960 if (fdata->start_unit > fdata->stop_unit) {
961 DEV_MESSAGE(KERN_INFO, device, "Track %d reached! ending.",
962 fdata->start_unit);
963 return ERR_PTR(-EINVAL);
964 }
965 if (dasd_check_blocksize(fdata->blksize) != 0) {
966 DEV_MESSAGE(KERN_WARNING, device,
967 "Invalid blocksize %d...terminating!",
968 fdata->blksize);
969 return ERR_PTR(-EINVAL);
970 }
971
972 /*
973 * fdata->intensity is a bit string that tells us what to do:
974 * Bit 0: write record zero
975 * Bit 1: write home address, currently not supported
976 * Bit 2: invalidate tracks
977 * Bit 3: use OS/390 compatible disk layout (cdl)
978 * Only some bit combinations do make sense.
979 */
980 switch (fdata->intensity) {
981 case 0x00: /* Normal format */
982 case 0x08: /* Normal format, use cdl. */
983 cplength = 2 + rpt;
984 datasize = sizeof(struct DE_eckd_data) +
985 sizeof(struct LO_eckd_data) +
986 rpt * sizeof(struct eckd_count);
987 break;
988 case 0x01: /* Write record zero and format track. */
989 case 0x09: /* Write record zero and format track, use cdl. */
990 cplength = 3 + rpt;
991 datasize = sizeof(struct DE_eckd_data) +
992 sizeof(struct LO_eckd_data) +
993 sizeof(struct eckd_count) +
994 rpt * sizeof(struct eckd_count);
995 break;
996 case 0x04: /* Invalidate track. */
997 case 0x0c: /* Invalidate track, use cdl. */
998 cplength = 3;
999 datasize = sizeof(struct DE_eckd_data) +
1000 sizeof(struct LO_eckd_data) +
1001 sizeof(struct eckd_count);
1002 break;
1003 default:
1004 DEV_MESSAGE(KERN_WARNING, device, "Invalid flags 0x%x.",
1005 fdata->intensity);
1006 return ERR_PTR(-EINVAL);
1007 }
1008 /* Allocate the format ccw request. */
1009 fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
1010 cplength, datasize, device);
1011 if (IS_ERR(fcp))
1012 return fcp;
1013
1014 data = fcp->data;
1015 ccw = fcp->cpaddr;
1016
1017 switch (fdata->intensity & ~0x08) {
1018 case 0x00: /* Normal format. */
1019 define_extent(ccw++, (struct DE_eckd_data *) data,
1020 fdata->start_unit, fdata->start_unit,
1021 DASD_ECKD_CCW_WRITE_CKD, device);
1022 data += sizeof(struct DE_eckd_data);
1023 ccw[-1].flags |= CCW_FLAG_CC;
1024 locate_record(ccw++, (struct LO_eckd_data *) data,
1025 fdata->start_unit, 0, rpt,
1026 DASD_ECKD_CCW_WRITE_CKD, device,
1027 fdata->blksize);
1028 data += sizeof(struct LO_eckd_data);
1029 break;
1030 case 0x01: /* Write record zero + format track. */
1031 define_extent(ccw++, (struct DE_eckd_data *) data,
1032 fdata->start_unit, fdata->start_unit,
1033 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
1034 device);
1035 data += sizeof(struct DE_eckd_data);
1036 ccw[-1].flags |= CCW_FLAG_CC;
1037 locate_record(ccw++, (struct LO_eckd_data *) data,
1038 fdata->start_unit, 0, rpt + 1,
1039 DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
1040 device->bp_block);
1041 data += sizeof(struct LO_eckd_data);
1042 break;
1043 case 0x04: /* Invalidate track. */
1044 define_extent(ccw++, (struct DE_eckd_data *) data,
1045 fdata->start_unit, fdata->start_unit,
1046 DASD_ECKD_CCW_WRITE_CKD, device);
1047 data += sizeof(struct DE_eckd_data);
1048 ccw[-1].flags |= CCW_FLAG_CC;
1049 locate_record(ccw++, (struct LO_eckd_data *) data,
1050 fdata->start_unit, 0, 1,
1051 DASD_ECKD_CCW_WRITE_CKD, device, 8);
1052 data += sizeof(struct LO_eckd_data);
1053 break;
1054 }
1055 if (fdata->intensity & 0x01) { /* write record zero */
1056 ect = (struct eckd_count *) data;
1057 data += sizeof(struct eckd_count);
1058 ect->cyl = cyl;
1059 ect->head = head;
1060 ect->record = 0;
1061 ect->kl = 0;
1062 ect->dl = 8;
1063 ccw[-1].flags |= CCW_FLAG_CC;
1064 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
1065 ccw->flags = CCW_FLAG_SLI;
1066 ccw->count = 8;
1067 ccw->cda = (__u32)(addr_t) ect;
1068 ccw++;
1069 }
1070 if ((fdata->intensity & ~0x08) & 0x04) { /* erase track */
1071 ect = (struct eckd_count *) data;
1072 data += sizeof(struct eckd_count);
1073 ect->cyl = cyl;
1074 ect->head = head;
1075 ect->record = 1;
1076 ect->kl = 0;
1077 ect->dl = 0;
1078 ccw[-1].flags |= CCW_FLAG_CC;
1079 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1080 ccw->flags = CCW_FLAG_SLI;
1081 ccw->count = 8;
1082 ccw->cda = (__u32)(addr_t) ect;
1083 } else { /* write remaining records */
1084 for (i = 0; i < rpt; i++) {
1085 ect = (struct eckd_count *) data;
1086 data += sizeof(struct eckd_count);
1087 ect->cyl = cyl;
1088 ect->head = head;
1089 ect->record = i + 1;
1090 ect->kl = 0;
1091 ect->dl = fdata->blksize;
1092 /* Check for special tracks 0-1 when formatting CDL */
1093 if ((fdata->intensity & 0x08) &&
1094 fdata->start_unit == 0) {
1095 if (i < 3) {
1096 ect->kl = 4;
1097 ect->dl = sizes_trk0[i] - 4;
1098 }
1099 }
1100 if ((fdata->intensity & 0x08) &&
1101 fdata->start_unit == 1) {
1102 ect->kl = 44;
1103 ect->dl = LABEL_SIZE - 44;
1104 }
1105 ccw[-1].flags |= CCW_FLAG_CC;
1106 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
1107 ccw->flags = CCW_FLAG_SLI;
1108 ccw->count = 8;
1109 ccw->cda = (__u32)(addr_t) ect;
1110 ccw++;
1111 }
1112 }
1113 fcp->device = device;
1114 fcp->retries = 2; /* set retry counter to enable ERP */
1115 fcp->buildclk = get_clock();
1116 fcp->status = DASD_CQR_FILLED;
1117 return fcp;
1118 }
1119
1120 static dasd_era_t
1121 dasd_eckd_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
1122 {
1123 struct dasd_device *device = (struct dasd_device *) cqr->device;
1124 struct ccw_device *cdev = device->cdev;
1125
1126 if (irb->scsw.cstat == 0x00 &&
1127 irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
1128 return dasd_era_none;
1129
1130 switch (cdev->id.cu_type) {
1131 case 0x3990:
1132 case 0x2105:
1133 case 0x2107:
1134 case 0x1750:
1135 return dasd_3990_erp_examine(cqr, irb);
1136 case 0x9343:
1137 return dasd_9343_erp_examine(cqr, irb);
1138 case 0x3880:
1139 default:
1140 DEV_MESSAGE(KERN_WARNING, device, "%s",
1141 "default (unknown CU type) - RECOVERABLE return");
1142 return dasd_era_recover;
1143 }
1144 }
1145
1146 static dasd_erp_fn_t
1147 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
1148 {
1149 struct dasd_device *device = (struct dasd_device *) cqr->device;
1150 struct ccw_device *cdev = device->cdev;
1151
1152 switch (cdev->id.cu_type) {
1153 case 0x3990:
1154 case 0x2105:
1155 case 0x2107:
1156 case 0x1750:
1157 return dasd_3990_erp_action;
1158 case 0x9343:
1159 case 0x3880:
1160 default:
1161 return dasd_default_erp_action;
1162 }
1163 }
1164
1165 static dasd_erp_fn_t
1166 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
1167 {
1168 return dasd_default_erp_postaction;
1169 }
1170
1171 static struct dasd_ccw_req *
1172 dasd_eckd_build_cp(struct dasd_device * device, struct request *req)
1173 {
1174 struct dasd_eckd_private *private;
1175 unsigned long *idaws;
1176 struct LO_eckd_data *LO_data;
1177 struct dasd_ccw_req *cqr;
1178 struct ccw1 *ccw;
1179 struct req_iterator iter;
1180 struct bio_vec *bv;
1181 char *dst;
1182 unsigned int blksize, blk_per_trk, off;
1183 int count, cidaw, cplength, datasize;
1184 sector_t recid, first_rec, last_rec;
1185 sector_t first_trk, last_trk;
1186 unsigned int first_offs, last_offs;
1187 unsigned char cmd, rcmd;
1188
1189 private = (struct dasd_eckd_private *) device->private;
1190 if (rq_data_dir(req) == READ)
1191 cmd = DASD_ECKD_CCW_READ_MT;
1192 else if (rq_data_dir(req) == WRITE)
1193 cmd = DASD_ECKD_CCW_WRITE_MT;
1194 else
1195 return ERR_PTR(-EINVAL);
1196 /* Calculate number of blocks/records per track. */
1197 blksize = device->bp_block;
1198 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1199 /* Calculate record id of first and last block. */
1200 first_rec = first_trk = req->sector >> device->s2b_shift;
1201 first_offs = sector_div(first_trk, blk_per_trk);
1202 last_rec = last_trk =
1203 (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
1204 last_offs = sector_div(last_trk, blk_per_trk);
1205 /* Check struct bio and count the number of blocks for the request. */
1206 count = 0;
1207 cidaw = 0;
1208 rq_for_each_segment(bv, req, iter) {
1209 if (bv->bv_len & (blksize - 1))
1210 /* Eckd can only do full blocks. */
1211 return ERR_PTR(-EINVAL);
1212 count += bv->bv_len >> (device->s2b_shift + 9);
1213 #if defined(CONFIG_64BIT)
1214 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
1215 cidaw += bv->bv_len >> (device->s2b_shift + 9);
1216 #endif
1217 }
1218 /* Paranoia. */
1219 if (count != last_rec - first_rec + 1)
1220 return ERR_PTR(-EINVAL);
1221 /* 1x define extent + 1x locate record + number of blocks */
1222 cplength = 2 + count;
1223 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
1224 datasize = sizeof(struct DE_eckd_data) + sizeof(struct LO_eckd_data) +
1225 cidaw * sizeof(unsigned long);
1226 /* Find out the number of additional locate record ccws for cdl. */
1227 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
1228 if (last_rec >= 2*blk_per_trk)
1229 count = 2*blk_per_trk - first_rec;
1230 cplength += count;
1231 datasize += count*sizeof(struct LO_eckd_data);
1232 }
1233 /* Allocate the ccw request. */
1234 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1235 cplength, datasize, device);
1236 if (IS_ERR(cqr))
1237 return cqr;
1238 ccw = cqr->cpaddr;
1239 /* First ccw is define extent. */
1240 if (define_extent(ccw++, cqr->data, first_trk,
1241 last_trk, cmd, device) == -EAGAIN) {
1242 /* Clock not in sync and XRC is enabled. Try again later. */
1243 dasd_sfree_request(cqr, device);
1244 return ERR_PTR(-EAGAIN);
1245 }
1246 /* Build locate_record+read/write/ccws. */
1247 idaws = (unsigned long *) (cqr->data + sizeof(struct DE_eckd_data));
1248 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
1249 recid = first_rec;
1250 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
1251 /* Only standard blocks so there is just one locate record. */
1252 ccw[-1].flags |= CCW_FLAG_CC;
1253 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
1254 last_rec - recid + 1, cmd, device, blksize);
1255 }
1256 rq_for_each_segment(bv, req, iter) {
1257 dst = page_address(bv->bv_page) + bv->bv_offset;
1258 if (dasd_page_cache) {
1259 char *copy = kmem_cache_alloc(dasd_page_cache,
1260 GFP_DMA | __GFP_NOWARN);
1261 if (copy && rq_data_dir(req) == WRITE)
1262 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
1263 if (copy)
1264 dst = copy + bv->bv_offset;
1265 }
1266 for (off = 0; off < bv->bv_len; off += blksize) {
1267 sector_t trkid = recid;
1268 unsigned int recoffs = sector_div(trkid, blk_per_trk);
1269 rcmd = cmd;
1270 count = blksize;
1271 /* Locate record for cdl special block ? */
1272 if (private->uses_cdl && recid < 2*blk_per_trk) {
1273 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
1274 rcmd |= 0x8;
1275 count = dasd_eckd_cdl_reclen(recid);
1276 if (count < blksize &&
1277 rq_data_dir(req) == READ)
1278 memset(dst + count, 0xe5,
1279 blksize - count);
1280 }
1281 ccw[-1].flags |= CCW_FLAG_CC;
1282 locate_record(ccw++, LO_data++,
1283 trkid, recoffs + 1,
1284 1, rcmd, device, count);
1285 }
1286 /* Locate record for standard blocks ? */
1287 if (private->uses_cdl && recid == 2*blk_per_trk) {
1288 ccw[-1].flags |= CCW_FLAG_CC;
1289 locate_record(ccw++, LO_data++,
1290 trkid, recoffs + 1,
1291 last_rec - recid + 1,
1292 cmd, device, count);
1293 }
1294 /* Read/write ccw. */
1295 ccw[-1].flags |= CCW_FLAG_CC;
1296 ccw->cmd_code = rcmd;
1297 ccw->count = count;
1298 if (idal_is_needed(dst, blksize)) {
1299 ccw->cda = (__u32)(addr_t) idaws;
1300 ccw->flags = CCW_FLAG_IDA;
1301 idaws = idal_create_words(idaws, dst, blksize);
1302 } else {
1303 ccw->cda = (__u32)(addr_t) dst;
1304 ccw->flags = 0;
1305 }
1306 ccw++;
1307 dst += blksize;
1308 recid++;
1309 }
1310 }
1311 if (req->cmd_flags & REQ_FAILFAST)
1312 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1313 cqr->device = device;
1314 cqr->expires = 5 * 60 * HZ; /* 5 minutes */
1315 cqr->lpm = private->path_data.ppm;
1316 cqr->retries = 256;
1317 cqr->buildclk = get_clock();
1318 cqr->status = DASD_CQR_FILLED;
1319 return cqr;
1320 }
1321
1322 static int
1323 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
1324 {
1325 struct dasd_eckd_private *private;
1326 struct ccw1 *ccw;
1327 struct req_iterator iter;
1328 struct bio_vec *bv;
1329 char *dst, *cda;
1330 unsigned int blksize, blk_per_trk, off;
1331 sector_t recid;
1332 int status;
1333
1334 if (!dasd_page_cache)
1335 goto out;
1336 private = (struct dasd_eckd_private *) cqr->device->private;
1337 blksize = cqr->device->bp_block;
1338 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
1339 recid = req->sector >> cqr->device->s2b_shift;
1340 ccw = cqr->cpaddr;
1341 /* Skip over define extent & locate record. */
1342 ccw++;
1343 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
1344 ccw++;
1345 rq_for_each_segment(bv, req, iter) {
1346 dst = page_address(bv->bv_page) + bv->bv_offset;
1347 for (off = 0; off < bv->bv_len; off += blksize) {
1348 /* Skip locate record. */
1349 if (private->uses_cdl && recid <= 2*blk_per_trk)
1350 ccw++;
1351 if (dst) {
1352 if (ccw->flags & CCW_FLAG_IDA)
1353 cda = *((char **)((addr_t) ccw->cda));
1354 else
1355 cda = (char *)((addr_t) ccw->cda);
1356 if (dst != cda) {
1357 if (rq_data_dir(req) == READ)
1358 memcpy(dst, cda, bv->bv_len);
1359 kmem_cache_free(dasd_page_cache,
1360 (void *)((addr_t)cda & PAGE_MASK));
1361 }
1362 dst = NULL;
1363 }
1364 ccw++;
1365 recid++;
1366 }
1367 }
1368 out:
1369 status = cqr->status == DASD_CQR_DONE;
1370 dasd_sfree_request(cqr, cqr->device);
1371 return status;
1372 }
1373
1374 static int
1375 dasd_eckd_fill_info(struct dasd_device * device,
1376 struct dasd_information2_t * info)
1377 {
1378 struct dasd_eckd_private *private;
1379
1380 private = (struct dasd_eckd_private *) device->private;
1381 info->label_block = 2;
1382 info->FBA_layout = private->uses_cdl ? 0 : 1;
1383 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
1384 info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
1385 memcpy(info->characteristics, &private->rdc_data,
1386 sizeof(struct dasd_eckd_characteristics));
1387 info->confdata_size = sizeof (struct dasd_eckd_confdata);
1388 memcpy(info->configuration_data, &private->conf_data,
1389 sizeof (struct dasd_eckd_confdata));
1390 return 0;
1391 }
1392
1393 /*
1394 * SECTION: ioctl functions for eckd devices.
1395 */
1396
1397 /*
1398 * Release device ioctl.
1399 * Buils a channel programm to releases a prior reserved
1400 * (see dasd_eckd_reserve) device.
1401 */
1402 static int
1403 dasd_eckd_release(struct dasd_device *device)
1404 {
1405 struct dasd_ccw_req *cqr;
1406 int rc;
1407
1408 if (!capable(CAP_SYS_ADMIN))
1409 return -EACCES;
1410
1411 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1412 1, 32, device);
1413 if (IS_ERR(cqr)) {
1414 DEV_MESSAGE(KERN_WARNING, device, "%s",
1415 "Could not allocate initialization request");
1416 return PTR_ERR(cqr);
1417 }
1418 cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RELEASE;
1419 cqr->cpaddr->flags |= CCW_FLAG_SLI;
1420 cqr->cpaddr->count = 32;
1421 cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1422 cqr->device = device;
1423 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1424 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1425 cqr->retries = 2; /* set retry counter to enable basic ERP */
1426 cqr->expires = 2 * HZ;
1427 cqr->buildclk = get_clock();
1428 cqr->status = DASD_CQR_FILLED;
1429
1430 rc = dasd_sleep_on_immediatly(cqr);
1431
1432 dasd_sfree_request(cqr, cqr->device);
1433 return rc;
1434 }
1435
1436 /*
1437 * Reserve device ioctl.
1438 * Options are set to 'synchronous wait for interrupt' and
1439 * 'timeout the request'. This leads to a terminate IO if
1440 * the interrupt is outstanding for a certain time.
1441 */
1442 static int
1443 dasd_eckd_reserve(struct dasd_device *device)
1444 {
1445 struct dasd_ccw_req *cqr;
1446 int rc;
1447
1448 if (!capable(CAP_SYS_ADMIN))
1449 return -EACCES;
1450
1451 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1452 1, 32, device);
1453 if (IS_ERR(cqr)) {
1454 DEV_MESSAGE(KERN_WARNING, device, "%s",
1455 "Could not allocate initialization request");
1456 return PTR_ERR(cqr);
1457 }
1458 cqr->cpaddr->cmd_code = DASD_ECKD_CCW_RESERVE;
1459 cqr->cpaddr->flags |= CCW_FLAG_SLI;
1460 cqr->cpaddr->count = 32;
1461 cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1462 cqr->device = device;
1463 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1464 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1465 cqr->retries = 2; /* set retry counter to enable basic ERP */
1466 cqr->expires = 2 * HZ;
1467 cqr->buildclk = get_clock();
1468 cqr->status = DASD_CQR_FILLED;
1469
1470 rc = dasd_sleep_on_immediatly(cqr);
1471
1472 dasd_sfree_request(cqr, cqr->device);
1473 return rc;
1474 }
1475
1476 /*
1477 * Steal lock ioctl - unconditional reserve device.
1478 * Buils a channel programm to break a device's reservation.
1479 * (unconditional reserve)
1480 */
1481 static int
1482 dasd_eckd_steal_lock(struct dasd_device *device)
1483 {
1484 struct dasd_ccw_req *cqr;
1485 int rc;
1486
1487 if (!capable(CAP_SYS_ADMIN))
1488 return -EACCES;
1489
1490 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1491 1, 32, device);
1492 if (IS_ERR(cqr)) {
1493 DEV_MESSAGE(KERN_WARNING, device, "%s",
1494 "Could not allocate initialization request");
1495 return PTR_ERR(cqr);
1496 }
1497 cqr->cpaddr->cmd_code = DASD_ECKD_CCW_SLCK;
1498 cqr->cpaddr->flags |= CCW_FLAG_SLI;
1499 cqr->cpaddr->count = 32;
1500 cqr->cpaddr->cda = (__u32)(addr_t) cqr->data;
1501 cqr->device = device;
1502 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
1503 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
1504 cqr->retries = 2; /* set retry counter to enable basic ERP */
1505 cqr->expires = 2 * HZ;
1506 cqr->buildclk = get_clock();
1507 cqr->status = DASD_CQR_FILLED;
1508
1509 rc = dasd_sleep_on_immediatly(cqr);
1510
1511 dasd_sfree_request(cqr, cqr->device);
1512 return rc;
1513 }
1514
1515 /*
1516 * Read performance statistics
1517 */
1518 static int
1519 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
1520 {
1521 struct dasd_psf_prssd_data *prssdp;
1522 struct dasd_rssd_perf_stats_t *stats;
1523 struct dasd_ccw_req *cqr;
1524 struct ccw1 *ccw;
1525 int rc;
1526
1527 cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
1528 1 /* PSF */ + 1 /* RSSD */ ,
1529 (sizeof (struct dasd_psf_prssd_data) +
1530 sizeof (struct dasd_rssd_perf_stats_t)),
1531 device);
1532 if (IS_ERR(cqr)) {
1533 DEV_MESSAGE(KERN_WARNING, device, "%s",
1534 "Could not allocate initialization request");
1535 return PTR_ERR(cqr);
1536 }
1537 cqr->device = device;
1538 cqr->retries = 0;
1539 cqr->expires = 10 * HZ;
1540
1541 /* Prepare for Read Subsystem Data */
1542 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1543 memset(prssdp, 0, sizeof (struct dasd_psf_prssd_data));
1544 prssdp->order = PSF_ORDER_PRSSD;
1545 prssdp->suborder = 0x01; /* Perfomance Statistics */
1546 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
1547
1548 ccw = cqr->cpaddr;
1549 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1550 ccw->count = sizeof (struct dasd_psf_prssd_data);
1551 ccw->flags |= CCW_FLAG_CC;
1552 ccw->cda = (__u32)(addr_t) prssdp;
1553
1554 /* Read Subsystem Data - Performance Statistics */
1555 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1556 memset(stats, 0, sizeof (struct dasd_rssd_perf_stats_t));
1557
1558 ccw++;
1559 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1560 ccw->count = sizeof (struct dasd_rssd_perf_stats_t);
1561 ccw->cda = (__u32)(addr_t) stats;
1562
1563 cqr->buildclk = get_clock();
1564 cqr->status = DASD_CQR_FILLED;
1565 rc = dasd_sleep_on(cqr);
1566 if (rc == 0) {
1567 /* Prepare for Read Subsystem Data */
1568 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1569 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
1570 if (copy_to_user(argp, stats,
1571 sizeof(struct dasd_rssd_perf_stats_t)))
1572 rc = -EFAULT;
1573 }
1574 dasd_sfree_request(cqr, cqr->device);
1575 return rc;
1576 }
1577
1578 /*
1579 * Get attributes (cache operations)
1580 * Returnes the cache attributes used in Define Extend (DE).
1581 */
1582 static int
1583 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
1584 {
1585 struct dasd_eckd_private *private =
1586 (struct dasd_eckd_private *)device->private;
1587 struct attrib_data_t attrib = private->attrib;
1588 int rc;
1589
1590 if (!capable(CAP_SYS_ADMIN))
1591 return -EACCES;
1592 if (!argp)
1593 return -EINVAL;
1594
1595 rc = 0;
1596 if (copy_to_user(argp, (long *) &attrib,
1597 sizeof (struct attrib_data_t)))
1598 rc = -EFAULT;
1599
1600 return rc;
1601 }
1602
1603 /*
1604 * Set attributes (cache operations)
1605 * Stores the attributes for cache operation to be used in Define Extend (DE).
1606 */
1607 static int
1608 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
1609 {
1610 struct dasd_eckd_private *private =
1611 (struct dasd_eckd_private *)device->private;
1612 struct attrib_data_t attrib;
1613
1614 if (!capable(CAP_SYS_ADMIN))
1615 return -EACCES;
1616 if (!argp)
1617 return -EINVAL;
1618
1619 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
1620 return -EFAULT;
1621 private->attrib = attrib;
1622
1623 DEV_MESSAGE(KERN_INFO, device,
1624 "cache operation mode set to %x (%i cylinder prestage)",
1625 private->attrib.operation, private->attrib.nr_cyl);
1626 return 0;
1627 }
1628
1629 static int
1630 dasd_eckd_ioctl(struct dasd_device *device, unsigned int cmd, void __user *argp)
1631 {
1632 switch (cmd) {
1633 case BIODASDGATTR:
1634 return dasd_eckd_get_attrib(device, argp);
1635 case BIODASDSATTR:
1636 return dasd_eckd_set_attrib(device, argp);
1637 case BIODASDPSRD:
1638 return dasd_eckd_performance(device, argp);
1639 case BIODASDRLSE:
1640 return dasd_eckd_release(device);
1641 case BIODASDRSRV:
1642 return dasd_eckd_reserve(device);
1643 case BIODASDSLCK:
1644 return dasd_eckd_steal_lock(device);
1645 default:
1646 return -ENOIOCTLCMD;
1647 }
1648 }
1649
1650 /*
1651 * Dump the range of CCWs into 'page' buffer
1652 * and return number of printed chars.
1653 */
1654 static int
1655 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
1656 {
1657 int len, count;
1658 char *datap;
1659
1660 len = 0;
1661 while (from <= to) {
1662 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1663 " CCW %p: %08X %08X DAT:",
1664 from, ((int *) from)[0], ((int *) from)[1]);
1665
1666 /* get pointer to data (consider IDALs) */
1667 if (from->flags & CCW_FLAG_IDA)
1668 datap = (char *) *((addr_t *) (addr_t) from->cda);
1669 else
1670 datap = (char *) ((addr_t) from->cda);
1671
1672 /* dump data (max 32 bytes) */
1673 for (count = 0; count < from->count && count < 32; count++) {
1674 if (count % 8 == 0) len += sprintf(page + len, " ");
1675 if (count % 4 == 0) len += sprintf(page + len, " ");
1676 len += sprintf(page + len, "%02x", datap[count]);
1677 }
1678 len += sprintf(page + len, "\n");
1679 from++;
1680 }
1681 return len;
1682 }
1683
1684 /*
1685 * Print sense data and related channel program.
1686 * Parts are printed because printk buffer is only 1024 bytes.
1687 */
1688 static void
1689 dasd_eckd_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
1690 struct irb *irb)
1691 {
1692 char *page;
1693 struct ccw1 *first, *last, *fail, *from, *to;
1694 int len, sl, sct;
1695
1696 page = (char *) get_zeroed_page(GFP_ATOMIC);
1697 if (page == NULL) {
1698 DEV_MESSAGE(KERN_ERR, device, " %s",
1699 "No memory to dump sense data");
1700 return;
1701 }
1702 /* dump the sense data */
1703 len = sprintf(page, KERN_ERR PRINTK_HEADER
1704 " I/O status report for device %s:\n",
1705 device->cdev->dev.bus_id);
1706 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1707 " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
1708 irb->scsw.cstat, irb->scsw.dstat);
1709 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1710 " device %s: Failing CCW: %p\n",
1711 device->cdev->dev.bus_id,
1712 (void *) (addr_t) irb->scsw.cpa);
1713 if (irb->esw.esw0.erw.cons) {
1714 for (sl = 0; sl < 4; sl++) {
1715 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
1716 " Sense(hex) %2d-%2d:",
1717 (8 * sl), ((8 * sl) + 7));
1718
1719 for (sct = 0; sct < 8; sct++) {
1720 len += sprintf(page + len, " %02x",
1721 irb->ecw[8 * sl + sct]);
1722 }
1723 len += sprintf(page + len, "\n");
1724 }
1725
1726 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
1727 /* 24 Byte Sense Data */
1728 sprintf(page + len, KERN_ERR PRINTK_HEADER
1729 " 24 Byte: %x MSG %x, "
1730 "%s MSGb to SYSOP\n",
1731 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
1732 irb->ecw[1] & 0x10 ? "" : "no");
1733 } else {
1734 /* 32 Byte Sense Data */
1735 sprintf(page + len, KERN_ERR PRINTK_HEADER
1736 " 32 Byte: Format: %x "
1737 "Exception class %x\n",
1738 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
1739 }
1740 } else {
1741 sprintf(page + len, KERN_ERR PRINTK_HEADER
1742 " SORRY - NO VALID SENSE AVAILABLE\n");
1743 }
1744 printk("%s", page);
1745
1746 /* dump the Channel Program (max 140 Bytes per line) */
1747 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
1748 first = req->cpaddr;
1749 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
1750 to = min(first + 6, last);
1751 len = sprintf(page, KERN_ERR PRINTK_HEADER
1752 " Related CP in req: %p\n", req);
1753 dasd_eckd_dump_ccw_range(first, to, page + len);
1754 printk("%s", page);
1755
1756 /* print failing CCW area (maximum 4) */
1757 /* scsw->cda is either valid or zero */
1758 len = 0;
1759 from = ++to;
1760 fail = (struct ccw1 *)(addr_t) irb->scsw.cpa; /* failing CCW */
1761 if (from < fail - 2) {
1762 from = fail - 2; /* there is a gap - print header */
1763 len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
1764 }
1765 to = min(fail + 1, last);
1766 len += dasd_eckd_dump_ccw_range(from, to, page + len);
1767
1768 /* print last CCWs (maximum 2) */
1769 from = max(from, ++to);
1770 if (from < last - 1) {
1771 from = last - 1; /* there is a gap - print header */
1772 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
1773 }
1774 len += dasd_eckd_dump_ccw_range(from, last, page + len);
1775 if (len > 0)
1776 printk("%s", page);
1777 free_page((unsigned long) page);
1778 }
1779
1780 /*
1781 * max_blocks is dependent on the amount of storage that is available
1782 * in the static io buffer for each device. Currently each device has
1783 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
1784 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
1785 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
1786 * addition we have one define extent ccw + 16 bytes of data and one
1787 * locate record ccw + 16 bytes of data. That makes:
1788 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
1789 * We want to fit two into the available memory so that we can immediately
1790 * start the next request if one finishes off. That makes 249.5 blocks
1791 * for one request. Give a little safety and the result is 240.
1792 */
1793 static struct dasd_discipline dasd_eckd_discipline = {
1794 .owner = THIS_MODULE,
1795 .name = "ECKD",
1796 .ebcname = "ECKD",
1797 .max_blocks = 240,
1798 .check_device = dasd_eckd_check_characteristics,
1799 .do_analysis = dasd_eckd_do_analysis,
1800 .fill_geometry = dasd_eckd_fill_geometry,
1801 .start_IO = dasd_start_IO,
1802 .term_IO = dasd_term_IO,
1803 .format_device = dasd_eckd_format_device,
1804 .examine_error = dasd_eckd_examine_error,
1805 .erp_action = dasd_eckd_erp_action,
1806 .erp_postaction = dasd_eckd_erp_postaction,
1807 .build_cp = dasd_eckd_build_cp,
1808 .free_cp = dasd_eckd_free_cp,
1809 .dump_sense = dasd_eckd_dump_sense,
1810 .fill_info = dasd_eckd_fill_info,
1811 .ioctl = dasd_eckd_ioctl,
1812 };
1813
1814 static int __init
1815 dasd_eckd_init(void)
1816 {
1817 ASCEBC(dasd_eckd_discipline.ebcname, 4);
1818 return ccw_driver_register(&dasd_eckd_driver);
1819 }
1820
1821 static void __exit
1822 dasd_eckd_cleanup(void)
1823 {
1824 ccw_driver_unregister(&dasd_eckd_driver);
1825 }
1826
1827 module_init(dasd_eckd_init);
1828 module_exit(dasd_eckd_cleanup);
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