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Linux 4.1.16
[linux/fpc-iii.git] / drivers / s390 / block / dasd_eckd.c
blob6215f6455eb84ccc876e70156279681dce0e9bc3
1 /*
2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999, 2009
8 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
9 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
10 */
11
12 #define KMSG_COMPONENT "dasd-eckd"
13
14 #include <linux/stddef.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/hdreg.h> /* HDIO_GETGEO */
18 #include <linux/bio.h>
19 #include <linux/module.h>
20 #include <linux/compat.h>
21 #include <linux/init.h>
22
23 #include <asm/css_chars.h>
24 #include <asm/debug.h>
25 #include <asm/idals.h>
26 #include <asm/ebcdic.h>
27 #include <asm/io.h>
28 #include <asm/uaccess.h>
29 #include <asm/cio.h>
30 #include <asm/ccwdev.h>
31 #include <asm/itcw.h>
32 #include <asm/schid.h>
33 #include <asm/chpid.h>
34
35 #include "dasd_int.h"
36 #include "dasd_eckd.h"
37
38 #ifdef PRINTK_HEADER
39 #undef PRINTK_HEADER
40 #endif /* PRINTK_HEADER */
41 #define PRINTK_HEADER "dasd(eckd):"
42
43 #define ECKD_C0(i) (i->home_bytes)
44 #define ECKD_F(i) (i->formula)
45 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
46 (i->factors.f_0x02.f1))
47 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
48 (i->factors.f_0x02.f2))
49 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
50 (i->factors.f_0x02.f3))
51 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
52 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
53 #define ECKD_F6(i) (i->factor6)
54 #define ECKD_F7(i) (i->factor7)
55 #define ECKD_F8(i) (i->factor8)
56
57 /*
58 * raw track access always map to 64k in memory
59 * so it maps to 16 blocks of 4k per track
60 */
61 #define DASD_RAW_BLOCK_PER_TRACK 16
62 #define DASD_RAW_BLOCKSIZE 4096
63 /* 64k are 128 x 512 byte sectors */
64 #define DASD_RAW_SECTORS_PER_TRACK 128
65
66 MODULE_LICENSE("GPL");
67
68 static struct dasd_discipline dasd_eckd_discipline;
69
70 /* The ccw bus type uses this table to find devices that it sends to
71 * dasd_eckd_probe */
72 static struct ccw_device_id dasd_eckd_ids[] = {
73 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
74 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
75 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
76 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
77 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
78 { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
79 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
80 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
81 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
82 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
83 { /* end of list */ },
84 };
85
86 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
87
88 static struct ccw_driver dasd_eckd_driver; /* see below */
89
90 static void *rawpadpage;
91
92 #define INIT_CQR_OK 0
93 #define INIT_CQR_UNFORMATTED 1
94 #define INIT_CQR_ERROR 2
95
96 /* emergency request for reserve/release */
97 static struct {
98 struct dasd_ccw_req cqr;
99 struct ccw1 ccw;
100 char data[32];
101 } *dasd_reserve_req;
102 static DEFINE_MUTEX(dasd_reserve_mutex);
103
104 /* definitions for the path verification worker */
105 struct path_verification_work_data {
106 struct work_struct worker;
107 struct dasd_device *device;
108 struct dasd_ccw_req cqr;
109 struct ccw1 ccw;
110 __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
111 int isglobal;
112 __u8 tbvpm;
113 };
114 static struct path_verification_work_data *path_verification_worker;
115 static DEFINE_MUTEX(dasd_path_verification_mutex);
116
117 struct check_attention_work_data {
118 struct work_struct worker;
119 struct dasd_device *device;
120 __u8 lpum;
121 };
122
123 /* initial attempt at a probe function. this can be simplified once
124 * the other detection code is gone */
125 static int
126 dasd_eckd_probe (struct ccw_device *cdev)
127 {
128 int ret;
129
130 /* set ECKD specific ccw-device options */
131 ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
132 CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
133 if (ret) {
134 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
135 "dasd_eckd_probe: could not set "
136 "ccw-device options");
137 return ret;
138 }
139 ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
140 return ret;
141 }
142
143 static int
144 dasd_eckd_set_online(struct ccw_device *cdev)
145 {
146 return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
147 }
148
149 static const int sizes_trk0[] = { 28, 148, 84 };
150 #define LABEL_SIZE 140
151
152 /* head and record addresses of count_area read in analysis ccw */
153 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
154 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
155
156 static inline unsigned int
157 round_up_multiple(unsigned int no, unsigned int mult)
158 {
159 int rem = no % mult;
160 return (rem ? no - rem + mult : no);
161 }
162
163 static inline unsigned int
164 ceil_quot(unsigned int d1, unsigned int d2)
165 {
166 return (d1 + (d2 - 1)) / d2;
167 }
168
169 static unsigned int
170 recs_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
202 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
203 {
204 geo->cyl = (__u16) cyl;
205 geo->head = cyl >> 16;
206 geo->head <<= 4;
207 geo->head |= head;
208 }
209
210 static int
211 check_XRC (struct ccw1 *de_ccw,
212 struct DE_eckd_data *data,
213 struct dasd_device *device)
214 {
215 struct dasd_eckd_private *private;
216 int rc;
217
218 private = (struct dasd_eckd_private *) device->private;
219 if (!private->rdc_data.facilities.XRC_supported)
220 return 0;
221
222 /* switch on System Time Stamp - needed for XRC Support */
223 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
224 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
225
226 rc = get_sync_clock(&data->ep_sys_time);
227 /* Ignore return code if sync clock is switched off. */
228 if (rc == -EOPNOTSUPP || rc == -EACCES)
229 rc = 0;
230
231 de_ccw->count = sizeof(struct DE_eckd_data);
232 de_ccw->flags |= CCW_FLAG_SLI;
233 return rc;
234 }
235
236 static int
237 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
238 unsigned int totrk, int cmd, struct dasd_device *device)
239 {
240 struct dasd_eckd_private *private;
241 u32 begcyl, endcyl;
242 u16 heads, beghead, endhead;
243 int rc = 0;
244
245 private = (struct dasd_eckd_private *) device->private;
246
247 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
248 ccw->flags = 0;
249 ccw->count = 16;
250 ccw->cda = (__u32) __pa(data);
251
252 memset(data, 0, sizeof(struct DE_eckd_data));
253 switch (cmd) {
254 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
255 case DASD_ECKD_CCW_READ_RECORD_ZERO:
256 case DASD_ECKD_CCW_READ:
257 case DASD_ECKD_CCW_READ_MT:
258 case DASD_ECKD_CCW_READ_CKD:
259 case DASD_ECKD_CCW_READ_CKD_MT:
260 case DASD_ECKD_CCW_READ_KD:
261 case DASD_ECKD_CCW_READ_KD_MT:
262 case DASD_ECKD_CCW_READ_COUNT:
263 data->mask.perm = 0x1;
264 data->attributes.operation = private->attrib.operation;
265 break;
266 case DASD_ECKD_CCW_WRITE:
267 case DASD_ECKD_CCW_WRITE_MT:
268 case DASD_ECKD_CCW_WRITE_KD:
269 case DASD_ECKD_CCW_WRITE_KD_MT:
270 data->mask.perm = 0x02;
271 data->attributes.operation = private->attrib.operation;
272 rc = check_XRC (ccw, data, device);
273 break;
274 case DASD_ECKD_CCW_WRITE_CKD:
275 case DASD_ECKD_CCW_WRITE_CKD_MT:
276 data->attributes.operation = DASD_BYPASS_CACHE;
277 rc = check_XRC (ccw, data, device);
278 break;
279 case DASD_ECKD_CCW_ERASE:
280 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
281 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
282 data->mask.perm = 0x3;
283 data->mask.auth = 0x1;
284 data->attributes.operation = DASD_BYPASS_CACHE;
285 rc = check_XRC (ccw, data, device);
286 break;
287 default:
288 dev_err(&device->cdev->dev,
289 "0x%x is not a known command\n", cmd);
290 break;
291 }
292
293 data->attributes.mode = 0x3; /* ECKD */
294
295 if ((private->rdc_data.cu_type == 0x2105 ||
296 private->rdc_data.cu_type == 0x2107 ||
297 private->rdc_data.cu_type == 0x1750)
298 && !(private->uses_cdl && trk < 2))
299 data->ga_extended |= 0x40; /* Regular Data Format Mode */
300
301 heads = private->rdc_data.trk_per_cyl;
302 begcyl = trk / heads;
303 beghead = trk % heads;
304 endcyl = totrk / heads;
305 endhead = totrk % heads;
306
307 /* check for sequential prestage - enhance cylinder range */
308 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
309 data->attributes.operation == DASD_SEQ_ACCESS) {
310
311 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
312 endcyl += private->attrib.nr_cyl;
313 else
314 endcyl = (private->real_cyl - 1);
315 }
316
317 set_ch_t(&data->beg_ext, begcyl, beghead);
318 set_ch_t(&data->end_ext, endcyl, endhead);
319 return rc;
320 }
321
322 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
323 struct dasd_device *device)
324 {
325 struct dasd_eckd_private *private;
326 int rc;
327
328 private = (struct dasd_eckd_private *) device->private;
329 if (!private->rdc_data.facilities.XRC_supported)
330 return 0;
331
332 /* switch on System Time Stamp - needed for XRC Support */
333 pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid' */
334 pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
335 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
336
337 rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
338 /* Ignore return code if sync clock is switched off. */
339 if (rc == -EOPNOTSUPP || rc == -EACCES)
340 rc = 0;
341 return rc;
342 }
343
344 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
345 unsigned int rec_on_trk, int count, int cmd,
346 struct dasd_device *device, unsigned int reclen,
347 unsigned int tlf)
348 {
349 struct dasd_eckd_private *private;
350 int sector;
351 int dn, d;
352
353 private = (struct dasd_eckd_private *) device->private;
354
355 memset(data, 0, sizeof(*data));
356 sector = 0;
357 if (rec_on_trk) {
358 switch (private->rdc_data.dev_type) {
359 case 0x3390:
360 dn = ceil_quot(reclen + 6, 232);
361 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
362 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
363 break;
364 case 0x3380:
365 d = 7 + ceil_quot(reclen + 12, 32);
366 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
367 break;
368 }
369 }
370 data->sector = sector;
371 /* note: meaning of count depends on the operation
372 * for record based I/O it's the number of records, but for
373 * track based I/O it's the number of tracks
374 */
375 data->count = count;
376 switch (cmd) {
377 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
378 data->operation.orientation = 0x3;
379 data->operation.operation = 0x03;
380 break;
381 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
382 data->operation.orientation = 0x3;
383 data->operation.operation = 0x16;
384 break;
385 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
386 data->operation.orientation = 0x1;
387 data->operation.operation = 0x03;
388 data->count++;
389 break;
390 case DASD_ECKD_CCW_READ_RECORD_ZERO:
391 data->operation.orientation = 0x3;
392 data->operation.operation = 0x16;
393 data->count++;
394 break;
395 case DASD_ECKD_CCW_WRITE:
396 case DASD_ECKD_CCW_WRITE_MT:
397 case DASD_ECKD_CCW_WRITE_KD:
398 case DASD_ECKD_CCW_WRITE_KD_MT:
399 data->auxiliary.length_valid = 0x1;
400 data->length = reclen;
401 data->operation.operation = 0x01;
402 break;
403 case DASD_ECKD_CCW_WRITE_CKD:
404 case DASD_ECKD_CCW_WRITE_CKD_MT:
405 data->auxiliary.length_valid = 0x1;
406 data->length = reclen;
407 data->operation.operation = 0x03;
408 break;
409 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
410 data->operation.orientation = 0x0;
411 data->operation.operation = 0x3F;
412 data->extended_operation = 0x11;
413 data->length = 0;
414 data->extended_parameter_length = 0x02;
415 if (data->count > 8) {
416 data->extended_parameter[0] = 0xFF;
417 data->extended_parameter[1] = 0xFF;
418 data->extended_parameter[1] <<= (16 - count);
419 } else {
420 data->extended_parameter[0] = 0xFF;
421 data->extended_parameter[0] <<= (8 - count);
422 data->extended_parameter[1] = 0x00;
423 }
424 data->sector = 0xFF;
425 break;
426 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
427 data->auxiliary.length_valid = 0x1;
428 data->length = reclen; /* not tlf, as one might think */
429 data->operation.operation = 0x3F;
430 data->extended_operation = 0x23;
431 break;
432 case DASD_ECKD_CCW_READ:
433 case DASD_ECKD_CCW_READ_MT:
434 case DASD_ECKD_CCW_READ_KD:
435 case DASD_ECKD_CCW_READ_KD_MT:
436 data->auxiliary.length_valid = 0x1;
437 data->length = reclen;
438 data->operation.operation = 0x06;
439 break;
440 case DASD_ECKD_CCW_READ_CKD:
441 case DASD_ECKD_CCW_READ_CKD_MT:
442 data->auxiliary.length_valid = 0x1;
443 data->length = reclen;
444 data->operation.operation = 0x16;
445 break;
446 case DASD_ECKD_CCW_READ_COUNT:
447 data->operation.operation = 0x06;
448 break;
449 case DASD_ECKD_CCW_READ_TRACK:
450 data->operation.orientation = 0x1;
451 data->operation.operation = 0x0C;
452 data->extended_parameter_length = 0;
453 data->sector = 0xFF;
454 break;
455 case DASD_ECKD_CCW_READ_TRACK_DATA:
456 data->auxiliary.length_valid = 0x1;
457 data->length = tlf;
458 data->operation.operation = 0x0C;
459 break;
460 case DASD_ECKD_CCW_ERASE:
461 data->length = reclen;
462 data->auxiliary.length_valid = 0x1;
463 data->operation.operation = 0x0b;
464 break;
465 default:
466 DBF_DEV_EVENT(DBF_ERR, device,
467 "fill LRE unknown opcode 0x%x", cmd);
468 BUG();
469 }
470 set_ch_t(&data->seek_addr,
471 trk / private->rdc_data.trk_per_cyl,
472 trk % private->rdc_data.trk_per_cyl);
473 data->search_arg.cyl = data->seek_addr.cyl;
474 data->search_arg.head = data->seek_addr.head;
475 data->search_arg.record = rec_on_trk;
476 }
477
478 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
479 unsigned int trk, unsigned int totrk, int cmd,
480 struct dasd_device *basedev, struct dasd_device *startdev,
481 unsigned char format, unsigned int rec_on_trk, int count,
482 unsigned int blksize, unsigned int tlf)
483 {
484 struct dasd_eckd_private *basepriv, *startpriv;
485 struct DE_eckd_data *dedata;
486 struct LRE_eckd_data *lredata;
487 u32 begcyl, endcyl;
488 u16 heads, beghead, endhead;
489 int rc = 0;
490
491 basepriv = (struct dasd_eckd_private *) basedev->private;
492 startpriv = (struct dasd_eckd_private *) startdev->private;
493 dedata = &pfxdata->define_extent;
494 lredata = &pfxdata->locate_record;
495
496 ccw->cmd_code = DASD_ECKD_CCW_PFX;
497 ccw->flags = 0;
498 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
499 ccw->count = sizeof(*pfxdata) + 2;
500 ccw->cda = (__u32) __pa(pfxdata);
501 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
502 } else {
503 ccw->count = sizeof(*pfxdata);
504 ccw->cda = (__u32) __pa(pfxdata);
505 memset(pfxdata, 0, sizeof(*pfxdata));
506 }
507
508 /* prefix data */
509 if (format > 1) {
510 DBF_DEV_EVENT(DBF_ERR, basedev,
511 "PFX LRE unknown format 0x%x", format);
512 BUG();
513 return -EINVAL;
514 }
515 pfxdata->format = format;
516 pfxdata->base_address = basepriv->ned->unit_addr;
517 pfxdata->base_lss = basepriv->ned->ID;
518 pfxdata->validity.define_extent = 1;
519
520 /* private uid is kept up to date, conf_data may be outdated */
521 if (startpriv->uid.type != UA_BASE_DEVICE) {
522 pfxdata->validity.verify_base = 1;
523 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
524 pfxdata->validity.hyper_pav = 1;
525 }
526
527 /* define extend data (mostly)*/
528 switch (cmd) {
529 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
530 case DASD_ECKD_CCW_READ_RECORD_ZERO:
531 case DASD_ECKD_CCW_READ:
532 case DASD_ECKD_CCW_READ_MT:
533 case DASD_ECKD_CCW_READ_CKD:
534 case DASD_ECKD_CCW_READ_CKD_MT:
535 case DASD_ECKD_CCW_READ_KD:
536 case DASD_ECKD_CCW_READ_KD_MT:
537 case DASD_ECKD_CCW_READ_COUNT:
538 dedata->mask.perm = 0x1;
539 dedata->attributes.operation = basepriv->attrib.operation;
540 break;
541 case DASD_ECKD_CCW_READ_TRACK:
542 case DASD_ECKD_CCW_READ_TRACK_DATA:
543 dedata->mask.perm = 0x1;
544 dedata->attributes.operation = basepriv->attrib.operation;
545 dedata->blk_size = 0;
546 break;
547 case DASD_ECKD_CCW_WRITE:
548 case DASD_ECKD_CCW_WRITE_MT:
549 case DASD_ECKD_CCW_WRITE_KD:
550 case DASD_ECKD_CCW_WRITE_KD_MT:
551 dedata->mask.perm = 0x02;
552 dedata->attributes.operation = basepriv->attrib.operation;
553 rc = check_XRC_on_prefix(pfxdata, basedev);
554 break;
555 case DASD_ECKD_CCW_WRITE_CKD:
556 case DASD_ECKD_CCW_WRITE_CKD_MT:
557 dedata->attributes.operation = DASD_BYPASS_CACHE;
558 rc = check_XRC_on_prefix(pfxdata, basedev);
559 break;
560 case DASD_ECKD_CCW_ERASE:
561 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
562 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
563 dedata->mask.perm = 0x3;
564 dedata->mask.auth = 0x1;
565 dedata->attributes.operation = DASD_BYPASS_CACHE;
566 rc = check_XRC_on_prefix(pfxdata, basedev);
567 break;
568 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
569 dedata->mask.perm = 0x03;
570 dedata->attributes.operation = basepriv->attrib.operation;
571 dedata->blk_size = 0;
572 break;
573 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
574 dedata->mask.perm = 0x02;
575 dedata->attributes.operation = basepriv->attrib.operation;
576 dedata->blk_size = blksize;
577 rc = check_XRC_on_prefix(pfxdata, basedev);
578 break;
579 default:
580 DBF_DEV_EVENT(DBF_ERR, basedev,
581 "PFX LRE unknown opcode 0x%x", cmd);
582 BUG();
583 return -EINVAL;
584 }
585
586 dedata->attributes.mode = 0x3; /* ECKD */
587
588 if ((basepriv->rdc_data.cu_type == 0x2105 ||
589 basepriv->rdc_data.cu_type == 0x2107 ||
590 basepriv->rdc_data.cu_type == 0x1750)
591 && !(basepriv->uses_cdl && trk < 2))
592 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
593
594 heads = basepriv->rdc_data.trk_per_cyl;
595 begcyl = trk / heads;
596 beghead = trk % heads;
597 endcyl = totrk / heads;
598 endhead = totrk % heads;
599
600 /* check for sequential prestage - enhance cylinder range */
601 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
602 dedata->attributes.operation == DASD_SEQ_ACCESS) {
603
604 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
605 endcyl += basepriv->attrib.nr_cyl;
606 else
607 endcyl = (basepriv->real_cyl - 1);
608 }
609
610 set_ch_t(&dedata->beg_ext, begcyl, beghead);
611 set_ch_t(&dedata->end_ext, endcyl, endhead);
612
613 if (format == 1) {
614 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
615 basedev, blksize, tlf);
616 }
617
618 return rc;
619 }
620
621 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
622 unsigned int trk, unsigned int totrk, int cmd,
623 struct dasd_device *basedev, struct dasd_device *startdev)
624 {
625 return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
626 0, 0, 0, 0, 0);
627 }
628
629 static void
630 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
631 unsigned int rec_on_trk, int no_rec, int cmd,
632 struct dasd_device * device, int reclen)
633 {
634 struct dasd_eckd_private *private;
635 int sector;
636 int dn, d;
637
638 private = (struct dasd_eckd_private *) device->private;
639
640 DBF_DEV_EVENT(DBF_INFO, device,
641 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
642 trk, rec_on_trk, no_rec, cmd, reclen);
643
644 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
645 ccw->flags = 0;
646 ccw->count = 16;
647 ccw->cda = (__u32) __pa(data);
648
649 memset(data, 0, sizeof(struct LO_eckd_data));
650 sector = 0;
651 if (rec_on_trk) {
652 switch (private->rdc_data.dev_type) {
653 case 0x3390:
654 dn = ceil_quot(reclen + 6, 232);
655 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
656 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
657 break;
658 case 0x3380:
659 d = 7 + ceil_quot(reclen + 12, 32);
660 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
661 break;
662 }
663 }
664 data->sector = sector;
665 data->count = no_rec;
666 switch (cmd) {
667 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
668 data->operation.orientation = 0x3;
669 data->operation.operation = 0x03;
670 break;
671 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
672 data->operation.orientation = 0x3;
673 data->operation.operation = 0x16;
674 break;
675 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
676 data->operation.orientation = 0x1;
677 data->operation.operation = 0x03;
678 data->count++;
679 break;
680 case DASD_ECKD_CCW_READ_RECORD_ZERO:
681 data->operation.orientation = 0x3;
682 data->operation.operation = 0x16;
683 data->count++;
684 break;
685 case DASD_ECKD_CCW_WRITE:
686 case DASD_ECKD_CCW_WRITE_MT:
687 case DASD_ECKD_CCW_WRITE_KD:
688 case DASD_ECKD_CCW_WRITE_KD_MT:
689 data->auxiliary.last_bytes_used = 0x1;
690 data->length = reclen;
691 data->operation.operation = 0x01;
692 break;
693 case DASD_ECKD_CCW_WRITE_CKD:
694 case DASD_ECKD_CCW_WRITE_CKD_MT:
695 data->auxiliary.last_bytes_used = 0x1;
696 data->length = reclen;
697 data->operation.operation = 0x03;
698 break;
699 case DASD_ECKD_CCW_READ:
700 case DASD_ECKD_CCW_READ_MT:
701 case DASD_ECKD_CCW_READ_KD:
702 case DASD_ECKD_CCW_READ_KD_MT:
703 data->auxiliary.last_bytes_used = 0x1;
704 data->length = reclen;
705 data->operation.operation = 0x06;
706 break;
707 case DASD_ECKD_CCW_READ_CKD:
708 case DASD_ECKD_CCW_READ_CKD_MT:
709 data->auxiliary.last_bytes_used = 0x1;
710 data->length = reclen;
711 data->operation.operation = 0x16;
712 break;
713 case DASD_ECKD_CCW_READ_COUNT:
714 data->operation.operation = 0x06;
715 break;
716 case DASD_ECKD_CCW_ERASE:
717 data->length = reclen;
718 data->auxiliary.last_bytes_used = 0x1;
719 data->operation.operation = 0x0b;
720 break;
721 default:
722 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
723 "opcode 0x%x", cmd);
724 }
725 set_ch_t(&data->seek_addr,
726 trk / private->rdc_data.trk_per_cyl,
727 trk % private->rdc_data.trk_per_cyl);
728 data->search_arg.cyl = data->seek_addr.cyl;
729 data->search_arg.head = data->seek_addr.head;
730 data->search_arg.record = rec_on_trk;
731 }
732
733 /*
734 * Returns 1 if the block is one of the special blocks that needs
735 * to get read/written with the KD variant of the command.
736 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
737 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
738 * Luckily the KD variants differ only by one bit (0x08) from the
739 * normal variant. So don't wonder about code like:
740 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
741 * ccw->cmd_code |= 0x8;
742 */
743 static inline int
744 dasd_eckd_cdl_special(int blk_per_trk, int recid)
745 {
746 if (recid < 3)
747 return 1;
748 if (recid < blk_per_trk)
749 return 0;
750 if (recid < 2 * blk_per_trk)
751 return 1;
752 return 0;
753 }
754
755 /*
756 * Returns the record size for the special blocks of the cdl format.
757 * Only returns something useful if dasd_eckd_cdl_special is true
758 * for the recid.
759 */
760 static inline int
761 dasd_eckd_cdl_reclen(int recid)
762 {
763 if (recid < 3)
764 return sizes_trk0[recid];
765 return LABEL_SIZE;
766 }
767 /* create unique id from private structure. */
768 static void create_uid(struct dasd_eckd_private *private)
769 {
770 int count;
771 struct dasd_uid *uid;
772
773 uid = &private->uid;
774 memset(uid, 0, sizeof(struct dasd_uid));
775 memcpy(uid->vendor, private->ned->HDA_manufacturer,
776 sizeof(uid->vendor) - 1);
777 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
778 memcpy(uid->serial, private->ned->HDA_location,
779 sizeof(uid->serial) - 1);
780 EBCASC(uid->serial, sizeof(uid->serial) - 1);
781 uid->ssid = private->gneq->subsystemID;
782 uid->real_unit_addr = private->ned->unit_addr;
783 if (private->sneq) {
784 uid->type = private->sneq->sua_flags;
785 if (uid->type == UA_BASE_PAV_ALIAS)
786 uid->base_unit_addr = private->sneq->base_unit_addr;
787 } else {
788 uid->type = UA_BASE_DEVICE;
789 }
790 if (private->vdsneq) {
791 for (count = 0; count < 16; count++) {
792 sprintf(uid->vduit+2*count, "%02x",
793 private->vdsneq->uit[count]);
794 }
795 }
796 }
797
798 /*
799 * Generate device unique id that specifies the physical device.
800 */
801 static int dasd_eckd_generate_uid(struct dasd_device *device)
802 {
803 struct dasd_eckd_private *private;
804 unsigned long flags;
805
806 private = (struct dasd_eckd_private *) device->private;
807 if (!private)
808 return -ENODEV;
809 if (!private->ned || !private->gneq)
810 return -ENODEV;
811 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
812 create_uid(private);
813 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
814 return 0;
815 }
816
817 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
818 {
819 struct dasd_eckd_private *private;
820 unsigned long flags;
821
822 if (device->private) {
823 private = (struct dasd_eckd_private *)device->private;
824 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
825 *uid = private->uid;
826 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
827 return 0;
828 }
829 return -EINVAL;
830 }
831
832 /*
833 * compare device UID with data of a given dasd_eckd_private structure
834 * return 0 for match
835 */
836 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
837 struct dasd_eckd_private *private)
838 {
839 struct dasd_uid device_uid;
840
841 create_uid(private);
842 dasd_eckd_get_uid(device, &device_uid);
843
844 return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
845 }
846
847 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
848 struct dasd_ccw_req *cqr,
849 __u8 *rcd_buffer,
850 __u8 lpm)
851 {
852 struct ccw1 *ccw;
853 /*
854 * buffer has to start with EBCDIC "V1.0" to show
855 * support for virtual device SNEQ
856 */
857 rcd_buffer[0] = 0xE5;
858 rcd_buffer[1] = 0xF1;
859 rcd_buffer[2] = 0x4B;
860 rcd_buffer[3] = 0xF0;
861
862 ccw = cqr->cpaddr;
863 ccw->cmd_code = DASD_ECKD_CCW_RCD;
864 ccw->flags = 0;
865 ccw->cda = (__u32)(addr_t)rcd_buffer;
866 ccw->count = DASD_ECKD_RCD_DATA_SIZE;
867 cqr->magic = DASD_ECKD_MAGIC;
868
869 cqr->startdev = device;
870 cqr->memdev = device;
871 cqr->block = NULL;
872 cqr->expires = 10*HZ;
873 cqr->lpm = lpm;
874 cqr->retries = 256;
875 cqr->buildclk = get_tod_clock();
876 cqr->status = DASD_CQR_FILLED;
877 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
878 }
879
880 /*
881 * Wakeup helper for read_conf
882 * if the cqr is not done and needs some error recovery
883 * the buffer has to be re-initialized with the EBCDIC "V1.0"
884 * to show support for virtual device SNEQ
885 */
886 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
887 {
888 struct ccw1 *ccw;
889 __u8 *rcd_buffer;
890
891 if (cqr->status != DASD_CQR_DONE) {
892 ccw = cqr->cpaddr;
893 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
894 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
895
896 rcd_buffer[0] = 0xE5;
897 rcd_buffer[1] = 0xF1;
898 rcd_buffer[2] = 0x4B;
899 rcd_buffer[3] = 0xF0;
900 }
901 dasd_wakeup_cb(cqr, data);
902 }
903
904 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
905 struct dasd_ccw_req *cqr,
906 __u8 *rcd_buffer,
907 __u8 lpm)
908 {
909 struct ciw *ciw;
910 int rc;
911 /*
912 * sanity check: scan for RCD command in extended SenseID data
913 * some devices do not support RCD
914 */
915 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
916 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
917 return -EOPNOTSUPP;
918
919 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
920 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
921 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
922 cqr->retries = 5;
923 cqr->callback = read_conf_cb;
924 rc = dasd_sleep_on_immediatly(cqr);
925 return rc;
926 }
927
928 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
929 void **rcd_buffer,
930 int *rcd_buffer_size, __u8 lpm)
931 {
932 struct ciw *ciw;
933 char *rcd_buf = NULL;
934 int ret;
935 struct dasd_ccw_req *cqr;
936
937 /*
938 * sanity check: scan for RCD command in extended SenseID data
939 * some devices do not support RCD
940 */
941 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
942 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
943 ret = -EOPNOTSUPP;
944 goto out_error;
945 }
946 rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
947 if (!rcd_buf) {
948 ret = -ENOMEM;
949 goto out_error;
950 }
951 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
952 0, /* use rcd_buf as data ara */
953 device);
954 if (IS_ERR(cqr)) {
955 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
956 "Could not allocate RCD request");
957 ret = -ENOMEM;
958 goto out_error;
959 }
960 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
961 cqr->callback = read_conf_cb;
962 ret = dasd_sleep_on(cqr);
963 /*
964 * on success we update the user input parms
965 */
966 dasd_sfree_request(cqr, cqr->memdev);
967 if (ret)
968 goto out_error;
969
970 *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
971 *rcd_buffer = rcd_buf;
972 return 0;
973 out_error:
974 kfree(rcd_buf);
975 *rcd_buffer = NULL;
976 *rcd_buffer_size = 0;
977 return ret;
978 }
979
980 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
981 {
982
983 struct dasd_sneq *sneq;
984 int i, count;
985
986 private->ned = NULL;
987 private->sneq = NULL;
988 private->vdsneq = NULL;
989 private->gneq = NULL;
990 count = private->conf_len / sizeof(struct dasd_sneq);
991 sneq = (struct dasd_sneq *)private->conf_data;
992 for (i = 0; i < count; ++i) {
993 if (sneq->flags.identifier == 1 && sneq->format == 1)
994 private->sneq = sneq;
995 else if (sneq->flags.identifier == 1 && sneq->format == 4)
996 private->vdsneq = (struct vd_sneq *)sneq;
997 else if (sneq->flags.identifier == 2)
998 private->gneq = (struct dasd_gneq *)sneq;
999 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
1000 private->ned = (struct dasd_ned *)sneq;
1001 sneq++;
1002 }
1003 if (!private->ned || !private->gneq) {
1004 private->ned = NULL;
1005 private->sneq = NULL;
1006 private->vdsneq = NULL;
1007 private->gneq = NULL;
1008 return -EINVAL;
1009 }
1010 return 0;
1011
1012 };
1013
1014 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1015 {
1016 struct dasd_gneq *gneq;
1017 int i, count, found;
1018
1019 count = conf_len / sizeof(*gneq);
1020 gneq = (struct dasd_gneq *)conf_data;
1021 found = 0;
1022 for (i = 0; i < count; ++i) {
1023 if (gneq->flags.identifier == 2) {
1024 found = 1;
1025 break;
1026 }
1027 gneq++;
1028 }
1029 if (found)
1030 return ((char *)gneq)[18] & 0x07;
1031 else
1032 return 0;
1033 }
1034
1035 static int dasd_eckd_read_conf(struct dasd_device *device)
1036 {
1037 void *conf_data;
1038 int conf_len, conf_data_saved;
1039 int rc, path_err;
1040 __u8 lpm, opm;
1041 struct dasd_eckd_private *private, path_private;
1042 struct dasd_path *path_data;
1043 struct dasd_uid *uid;
1044 char print_path_uid[60], print_device_uid[60];
1045
1046 private = (struct dasd_eckd_private *) device->private;
1047 path_data = &device->path_data;
1048 opm = ccw_device_get_path_mask(device->cdev);
1049 conf_data_saved = 0;
1050 path_err = 0;
1051 /* get configuration data per operational path */
1052 for (lpm = 0x80; lpm; lpm>>= 1) {
1053 if (!(lpm & opm))
1054 continue;
1055 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1056 &conf_len, lpm);
1057 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
1058 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1059 "Read configuration data returned "
1060 "error %d", rc);
1061 return rc;
1062 }
1063 if (conf_data == NULL) {
1064 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1065 "No configuration data "
1066 "retrieved");
1067 /* no further analysis possible */
1068 path_data->opm |= lpm;
1069 continue; /* no error */
1070 }
1071 /* save first valid configuration data */
1072 if (!conf_data_saved) {
1073 kfree(private->conf_data);
1074 private->conf_data = conf_data;
1075 private->conf_len = conf_len;
1076 if (dasd_eckd_identify_conf_parts(private)) {
1077 private->conf_data = NULL;
1078 private->conf_len = 0;
1079 kfree(conf_data);
1080 continue;
1081 }
1082 /*
1083 * build device UID that other path data
1084 * can be compared to it
1085 */
1086 dasd_eckd_generate_uid(device);
1087 conf_data_saved++;
1088 } else {
1089 path_private.conf_data = conf_data;
1090 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1091 if (dasd_eckd_identify_conf_parts(
1092 &path_private)) {
1093 path_private.conf_data = NULL;
1094 path_private.conf_len = 0;
1095 kfree(conf_data);
1096 continue;
1097 }
1098
1099 if (dasd_eckd_compare_path_uid(
1100 device, &path_private)) {
1101 uid = &path_private.uid;
1102 if (strlen(uid->vduit) > 0)
1103 snprintf(print_path_uid,
1104 sizeof(print_path_uid),
1105 "%s.%s.%04x.%02x.%s",
1106 uid->vendor, uid->serial,
1107 uid->ssid, uid->real_unit_addr,
1108 uid->vduit);
1109 else
1110 snprintf(print_path_uid,
1111 sizeof(print_path_uid),
1112 "%s.%s.%04x.%02x",
1113 uid->vendor, uid->serial,
1114 uid->ssid,
1115 uid->real_unit_addr);
1116 uid = &private->uid;
1117 if (strlen(uid->vduit) > 0)
1118 snprintf(print_device_uid,
1119 sizeof(print_device_uid),
1120 "%s.%s.%04x.%02x.%s",
1121 uid->vendor, uid->serial,
1122 uid->ssid, uid->real_unit_addr,
1123 uid->vduit);
1124 else
1125 snprintf(print_device_uid,
1126 sizeof(print_device_uid),
1127 "%s.%s.%04x.%02x",
1128 uid->vendor, uid->serial,
1129 uid->ssid,
1130 uid->real_unit_addr);
1131 dev_err(&device->cdev->dev,
1132 "Not all channel paths lead to "
1133 "the same device, path %02X leads to "
1134 "device %s instead of %s\n", lpm,
1135 print_path_uid, print_device_uid);
1136 path_err = -EINVAL;
1137 path_data->cablepm |= lpm;
1138 continue;
1139 }
1140
1141 path_private.conf_data = NULL;
1142 path_private.conf_len = 0;
1143 }
1144 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1145 case 0x02:
1146 path_data->npm |= lpm;
1147 break;
1148 case 0x03:
1149 path_data->ppm |= lpm;
1150 break;
1151 }
1152 path_data->opm |= lpm;
1153 /*
1154 * if the path is used
1155 * it should not be in one of the negative lists
1156 */
1157 path_data->cablepm &= ~lpm;
1158 path_data->hpfpm &= ~lpm;
1159 path_data->cuirpm &= ~lpm;
1160
1161 if (conf_data != private->conf_data)
1162 kfree(conf_data);
1163 }
1164
1165 return path_err;
1166 }
1167
1168 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1169 {
1170 struct dasd_eckd_private *private;
1171 int mdc;
1172 u32 fcx_max_data;
1173
1174 private = (struct dasd_eckd_private *) device->private;
1175 if (private->fcx_max_data) {
1176 mdc = ccw_device_get_mdc(device->cdev, lpm);
1177 if ((mdc < 0)) {
1178 dev_warn(&device->cdev->dev,
1179 "Detecting the maximum data size for zHPF "
1180 "requests failed (rc=%d) for a new path %x\n",
1181 mdc, lpm);
1182 return mdc;
1183 }
1184 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1185 if (fcx_max_data < private->fcx_max_data) {
1186 dev_warn(&device->cdev->dev,
1187 "The maximum data size for zHPF requests %u "
1188 "on a new path %x is below the active maximum "
1189 "%u\n", fcx_max_data, lpm,
1190 private->fcx_max_data);
1191 return -EACCES;
1192 }
1193 }
1194 return 0;
1195 }
1196
1197 static int rebuild_device_uid(struct dasd_device *device,
1198 struct path_verification_work_data *data)
1199 {
1200 struct dasd_eckd_private *private;
1201 struct dasd_path *path_data;
1202 __u8 lpm, opm;
1203 int rc;
1204
1205 rc = -ENODEV;
1206 private = (struct dasd_eckd_private *) device->private;
1207 path_data = &device->path_data;
1208 opm = device->path_data.opm;
1209
1210 for (lpm = 0x80; lpm; lpm >>= 1) {
1211 if (!(lpm & opm))
1212 continue;
1213 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1214 memset(&data->cqr, 0, sizeof(data->cqr));
1215 data->cqr.cpaddr = &data->ccw;
1216 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1217 data->rcd_buffer,
1218 lpm);
1219
1220 if (rc) {
1221 if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1222 continue;
1223 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1224 "Read configuration data "
1225 "returned error %d", rc);
1226 break;
1227 }
1228 memcpy(private->conf_data, data->rcd_buffer,
1229 DASD_ECKD_RCD_DATA_SIZE);
1230 if (dasd_eckd_identify_conf_parts(private)) {
1231 rc = -ENODEV;
1232 } else /* first valid path is enough */
1233 break;
1234 }
1235
1236 if (!rc)
1237 rc = dasd_eckd_generate_uid(device);
1238
1239 return rc;
1240 }
1241
1242 static void do_path_verification_work(struct work_struct *work)
1243 {
1244 struct path_verification_work_data *data;
1245 struct dasd_device *device;
1246 struct dasd_eckd_private path_private;
1247 struct dasd_uid *uid;
1248 __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1249 __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1250 unsigned long flags;
1251 char print_uid[60];
1252 int rc;
1253
1254 data = container_of(work, struct path_verification_work_data, worker);
1255 device = data->device;
1256
1257 /* delay path verification until device was resumed */
1258 if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1259 schedule_work(work);
1260 return;
1261 }
1262
1263 opm = 0;
1264 npm = 0;
1265 ppm = 0;
1266 epm = 0;
1267 hpfpm = 0;
1268 cablepm = 0;
1269
1270 for (lpm = 0x80; lpm; lpm >>= 1) {
1271 if (!(lpm & data->tbvpm))
1272 continue;
1273 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1274 memset(&data->cqr, 0, sizeof(data->cqr));
1275 data->cqr.cpaddr = &data->ccw;
1276 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1277 data->rcd_buffer,
1278 lpm);
1279 if (!rc) {
1280 switch (dasd_eckd_path_access(data->rcd_buffer,
1281 DASD_ECKD_RCD_DATA_SIZE)
1282 ) {
1283 case 0x02:
1284 npm |= lpm;
1285 break;
1286 case 0x03:
1287 ppm |= lpm;
1288 break;
1289 }
1290 opm |= lpm;
1291 } else if (rc == -EOPNOTSUPP) {
1292 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1293 "path verification: No configuration "
1294 "data retrieved");
1295 opm |= lpm;
1296 } else if (rc == -EAGAIN) {
1297 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1298 "path verification: device is stopped,"
1299 " try again later");
1300 epm |= lpm;
1301 } else {
1302 dev_warn(&device->cdev->dev,
1303 "Reading device feature codes failed "
1304 "(rc=%d) for new path %x\n", rc, lpm);
1305 continue;
1306 }
1307 if (verify_fcx_max_data(device, lpm)) {
1308 opm &= ~lpm;
1309 npm &= ~lpm;
1310 ppm &= ~lpm;
1311 hpfpm |= lpm;
1312 continue;
1313 }
1314
1315 /*
1316 * save conf_data for comparison after
1317 * rebuild_device_uid may have changed
1318 * the original data
1319 */
1320 memcpy(&path_rcd_buf, data->rcd_buffer,
1321 DASD_ECKD_RCD_DATA_SIZE);
1322 path_private.conf_data = (void *) &path_rcd_buf;
1323 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1324 if (dasd_eckd_identify_conf_parts(&path_private)) {
1325 path_private.conf_data = NULL;
1326 path_private.conf_len = 0;
1327 continue;
1328 }
1329
1330 /*
1331 * compare path UID with device UID only if at least
1332 * one valid path is left
1333 * in other case the device UID may have changed and
1334 * the first working path UID will be used as device UID
1335 */
1336 if (device->path_data.opm &&
1337 dasd_eckd_compare_path_uid(device, &path_private)) {
1338 /*
1339 * the comparison was not successful
1340 * rebuild the device UID with at least one
1341 * known path in case a z/VM hyperswap command
1342 * has changed the device
1343 *
1344 * after this compare again
1345 *
1346 * if either the rebuild or the recompare fails
1347 * the path can not be used
1348 */
1349 if (rebuild_device_uid(device, data) ||
1350 dasd_eckd_compare_path_uid(
1351 device, &path_private)) {
1352 uid = &path_private.uid;
1353 if (strlen(uid->vduit) > 0)
1354 snprintf(print_uid, sizeof(print_uid),
1355 "%s.%s.%04x.%02x.%s",
1356 uid->vendor, uid->serial,
1357 uid->ssid, uid->real_unit_addr,
1358 uid->vduit);
1359 else
1360 snprintf(print_uid, sizeof(print_uid),
1361 "%s.%s.%04x.%02x",
1362 uid->vendor, uid->serial,
1363 uid->ssid,
1364 uid->real_unit_addr);
1365 dev_err(&device->cdev->dev,
1366 "The newly added channel path %02X "
1367 "will not be used because it leads "
1368 "to a different device %s\n",
1369 lpm, print_uid);
1370 opm &= ~lpm;
1371 npm &= ~lpm;
1372 ppm &= ~lpm;
1373 cablepm |= lpm;
1374 continue;
1375 }
1376 }
1377
1378 /*
1379 * There is a small chance that a path is lost again between
1380 * above path verification and the following modification of
1381 * the device opm mask. We could avoid that race here by using
1382 * yet another path mask, but we rather deal with this unlikely
1383 * situation in dasd_start_IO.
1384 */
1385 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1386 if (!device->path_data.opm && opm) {
1387 device->path_data.opm = opm;
1388 device->path_data.cablepm &= ~opm;
1389 device->path_data.cuirpm &= ~opm;
1390 device->path_data.hpfpm &= ~opm;
1391 dasd_generic_path_operational(device);
1392 } else {
1393 device->path_data.opm |= opm;
1394 device->path_data.cablepm &= ~opm;
1395 device->path_data.cuirpm &= ~opm;
1396 device->path_data.hpfpm &= ~opm;
1397 }
1398 device->path_data.npm |= npm;
1399 device->path_data.ppm |= ppm;
1400 device->path_data.tbvpm |= epm;
1401 device->path_data.cablepm |= cablepm;
1402 device->path_data.hpfpm |= hpfpm;
1403 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1404 }
1405
1406 dasd_put_device(device);
1407 if (data->isglobal)
1408 mutex_unlock(&dasd_path_verification_mutex);
1409 else
1410 kfree(data);
1411 }
1412
1413 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1414 {
1415 struct path_verification_work_data *data;
1416
1417 data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1418 if (!data) {
1419 if (mutex_trylock(&dasd_path_verification_mutex)) {
1420 data = path_verification_worker;
1421 data->isglobal = 1;
1422 } else
1423 return -ENOMEM;
1424 } else {
1425 memset(data, 0, sizeof(*data));
1426 data->isglobal = 0;
1427 }
1428 INIT_WORK(&data->worker, do_path_verification_work);
1429 dasd_get_device(device);
1430 data->device = device;
1431 data->tbvpm = lpm;
1432 schedule_work(&data->worker);
1433 return 0;
1434 }
1435
1436 static int dasd_eckd_read_features(struct dasd_device *device)
1437 {
1438 struct dasd_psf_prssd_data *prssdp;
1439 struct dasd_rssd_features *features;
1440 struct dasd_ccw_req *cqr;
1441 struct ccw1 *ccw;
1442 int rc;
1443 struct dasd_eckd_private *private;
1444
1445 private = (struct dasd_eckd_private *) device->private;
1446 memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1447 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1448 (sizeof(struct dasd_psf_prssd_data) +
1449 sizeof(struct dasd_rssd_features)),
1450 device);
1451 if (IS_ERR(cqr)) {
1452 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1453 "allocate initialization request");
1454 return PTR_ERR(cqr);
1455 }
1456 cqr->startdev = device;
1457 cqr->memdev = device;
1458 cqr->block = NULL;
1459 cqr->retries = 256;
1460 cqr->expires = 10 * HZ;
1461
1462 /* Prepare for Read Subsystem Data */
1463 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1464 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1465 prssdp->order = PSF_ORDER_PRSSD;
1466 prssdp->suborder = 0x41; /* Read Feature Codes */
1467 /* all other bytes of prssdp must be zero */
1468
1469 ccw = cqr->cpaddr;
1470 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1471 ccw->count = sizeof(struct dasd_psf_prssd_data);
1472 ccw->flags |= CCW_FLAG_CC;
1473 ccw->cda = (__u32)(addr_t) prssdp;
1474
1475 /* Read Subsystem Data - feature codes */
1476 features = (struct dasd_rssd_features *) (prssdp + 1);
1477 memset(features, 0, sizeof(struct dasd_rssd_features));
1478
1479 ccw++;
1480 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1481 ccw->count = sizeof(struct dasd_rssd_features);
1482 ccw->cda = (__u32)(addr_t) features;
1483
1484 cqr->buildclk = get_tod_clock();
1485 cqr->status = DASD_CQR_FILLED;
1486 rc = dasd_sleep_on(cqr);
1487 if (rc == 0) {
1488 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1489 features = (struct dasd_rssd_features *) (prssdp + 1);
1490 memcpy(&private->features, features,
1491 sizeof(struct dasd_rssd_features));
1492 } else
1493 dev_warn(&device->cdev->dev, "Reading device feature codes"
1494 " failed with rc=%d\n", rc);
1495 dasd_sfree_request(cqr, cqr->memdev);
1496 return rc;
1497 }
1498
1499
1500 /*
1501 * Build CP for Perform Subsystem Function - SSC.
1502 */
1503 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1504 int enable_pav)
1505 {
1506 struct dasd_ccw_req *cqr;
1507 struct dasd_psf_ssc_data *psf_ssc_data;
1508 struct ccw1 *ccw;
1509
1510 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1511 sizeof(struct dasd_psf_ssc_data),
1512 device);
1513
1514 if (IS_ERR(cqr)) {
1515 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1516 "Could not allocate PSF-SSC request");
1517 return cqr;
1518 }
1519 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1520 psf_ssc_data->order = PSF_ORDER_SSC;
1521 psf_ssc_data->suborder = 0xc0;
1522 if (enable_pav) {
1523 psf_ssc_data->suborder |= 0x08;
1524 psf_ssc_data->reserved[0] = 0x88;
1525 }
1526 ccw = cqr->cpaddr;
1527 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1528 ccw->cda = (__u32)(addr_t)psf_ssc_data;
1529 ccw->count = 66;
1530
1531 cqr->startdev = device;
1532 cqr->memdev = device;
1533 cqr->block = NULL;
1534 cqr->retries = 256;
1535 cqr->expires = 10*HZ;
1536 cqr->buildclk = get_tod_clock();
1537 cqr->status = DASD_CQR_FILLED;
1538 return cqr;
1539 }
1540
1541 /*
1542 * Perform Subsystem Function.
1543 * It is necessary to trigger CIO for channel revalidation since this
1544 * call might change behaviour of DASD devices.
1545 */
1546 static int
1547 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1548 unsigned long flags)
1549 {
1550 struct dasd_ccw_req *cqr;
1551 int rc;
1552
1553 cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1554 if (IS_ERR(cqr))
1555 return PTR_ERR(cqr);
1556
1557 /*
1558 * set flags e.g. turn on failfast, to prevent blocking
1559 * the calling function should handle failed requests
1560 */
1561 cqr->flags |= flags;
1562
1563 rc = dasd_sleep_on(cqr);
1564 if (!rc)
1565 /* trigger CIO to reprobe devices */
1566 css_schedule_reprobe();
1567 else if (cqr->intrc == -EAGAIN)
1568 rc = -EAGAIN;
1569
1570 dasd_sfree_request(cqr, cqr->memdev);
1571 return rc;
1572 }
1573
1574 /*
1575 * Valide storage server of current device.
1576 */
1577 static int dasd_eckd_validate_server(struct dasd_device *device,
1578 unsigned long flags)
1579 {
1580 int rc;
1581 struct dasd_eckd_private *private;
1582 int enable_pav;
1583
1584 private = (struct dasd_eckd_private *) device->private;
1585 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1586 private->uid.type == UA_HYPER_PAV_ALIAS)
1587 return 0;
1588 if (dasd_nopav || MACHINE_IS_VM)
1589 enable_pav = 0;
1590 else
1591 enable_pav = 1;
1592 rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1593
1594 /* may be requested feature is not available on server,
1595 * therefore just report error and go ahead */
1596 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1597 "returned rc=%d", private->uid.ssid, rc);
1598 return rc;
1599 }
1600
1601 /*
1602 * worker to do a validate server in case of a lost pathgroup
1603 */
1604 static void dasd_eckd_do_validate_server(struct work_struct *work)
1605 {
1606 struct dasd_device *device = container_of(work, struct dasd_device,
1607 kick_validate);
1608 unsigned long flags = 0;
1609
1610 set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1611 if (dasd_eckd_validate_server(device, flags)
1612 == -EAGAIN) {
1613 /* schedule worker again if failed */
1614 schedule_work(&device->kick_validate);
1615 return;
1616 }
1617
1618 dasd_put_device(device);
1619 }
1620
1621 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1622 {
1623 dasd_get_device(device);
1624 /* exit if device not online or in offline processing */
1625 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1626 device->state < DASD_STATE_ONLINE) {
1627 dasd_put_device(device);
1628 return;
1629 }
1630 /* queue call to do_validate_server to the kernel event daemon. */
1631 if (!schedule_work(&device->kick_validate))
1632 dasd_put_device(device);
1633 }
1634
1635 static u32 get_fcx_max_data(struct dasd_device *device)
1636 {
1637 int tpm, mdc;
1638 int fcx_in_css, fcx_in_gneq, fcx_in_features;
1639 struct dasd_eckd_private *private;
1640
1641 if (dasd_nofcx)
1642 return 0;
1643 /* is transport mode supported? */
1644 private = (struct dasd_eckd_private *) device->private;
1645 fcx_in_css = css_general_characteristics.fcx;
1646 fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1647 fcx_in_features = private->features.feature[40] & 0x80;
1648 tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1649
1650 if (!tpm)
1651 return 0;
1652
1653 mdc = ccw_device_get_mdc(device->cdev, 0);
1654 if (mdc < 0) {
1655 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1656 " data size for zHPF requests failed\n");
1657 return 0;
1658 } else
1659 return mdc * FCX_MAX_DATA_FACTOR;
1660 }
1661
1662 /*
1663 * Check device characteristics.
1664 * If the device is accessible using ECKD discipline, the device is enabled.
1665 */
1666 static int
1667 dasd_eckd_check_characteristics(struct dasd_device *device)
1668 {
1669 struct dasd_eckd_private *private;
1670 struct dasd_block *block;
1671 struct dasd_uid temp_uid;
1672 int rc, i;
1673 int readonly;
1674 unsigned long value;
1675
1676 /* setup work queue for validate server*/
1677 INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1678
1679 if (!ccw_device_is_pathgroup(device->cdev)) {
1680 dev_warn(&device->cdev->dev,
1681 "A channel path group could not be established\n");
1682 return -EIO;
1683 }
1684 if (!ccw_device_is_multipath(device->cdev)) {
1685 dev_info(&device->cdev->dev,
1686 "The DASD is not operating in multipath mode\n");
1687 }
1688 private = (struct dasd_eckd_private *) device->private;
1689 if (!private) {
1690 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1691 if (!private) {
1692 dev_warn(&device->cdev->dev,
1693 "Allocating memory for private DASD data "
1694 "failed\n");
1695 return -ENOMEM;
1696 }
1697 device->private = (void *) private;
1698 } else {
1699 memset(private, 0, sizeof(*private));
1700 }
1701 /* Invalidate status of initial analysis. */
1702 private->init_cqr_status = -1;
1703 /* Set default cache operations. */
1704 private->attrib.operation = DASD_NORMAL_CACHE;
1705 private->attrib.nr_cyl = 0;
1706
1707 /* Read Configuration Data */
1708 rc = dasd_eckd_read_conf(device);
1709 if (rc)
1710 goto out_err1;
1711
1712 /* set default timeout */
1713 device->default_expires = DASD_EXPIRES;
1714 /* set default retry count */
1715 device->default_retries = DASD_RETRIES;
1716
1717 if (private->gneq) {
1718 value = 1;
1719 for (i = 0; i < private->gneq->timeout.value; i++)
1720 value = 10 * value;
1721 value = value * private->gneq->timeout.number;
1722 /* do not accept useless values */
1723 if (value != 0 && value <= DASD_EXPIRES_MAX)
1724 device->default_expires = value;
1725 }
1726
1727 dasd_eckd_get_uid(device, &temp_uid);
1728 if (temp_uid.type == UA_BASE_DEVICE) {
1729 block = dasd_alloc_block();
1730 if (IS_ERR(block)) {
1731 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1732 "could not allocate dasd "
1733 "block structure");
1734 rc = PTR_ERR(block);
1735 goto out_err1;
1736 }
1737 device->block = block;
1738 block->base = device;
1739 }
1740
1741 /* register lcu with alias handling, enable PAV */
1742 rc = dasd_alias_make_device_known_to_lcu(device);
1743 if (rc)
1744 goto out_err2;
1745
1746 dasd_eckd_validate_server(device, 0);
1747
1748 /* device may report different configuration data after LCU setup */
1749 rc = dasd_eckd_read_conf(device);
1750 if (rc)
1751 goto out_err3;
1752
1753 /* Read Feature Codes */
1754 dasd_eckd_read_features(device);
1755
1756 /* Read Device Characteristics */
1757 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1758 &private->rdc_data, 64);
1759 if (rc) {
1760 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1761 "Read device characteristic failed, rc=%d", rc);
1762 goto out_err3;
1763 }
1764
1765 if ((device->features & DASD_FEATURE_USERAW) &&
1766 !(private->rdc_data.facilities.RT_in_LR)) {
1767 dev_err(&device->cdev->dev, "The storage server does not "
1768 "support raw-track access\n");
1769 rc = -EINVAL;
1770 goto out_err3;
1771 }
1772
1773 /* find the valid cylinder size */
1774 if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1775 private->rdc_data.long_no_cyl)
1776 private->real_cyl = private->rdc_data.long_no_cyl;
1777 else
1778 private->real_cyl = private->rdc_data.no_cyl;
1779
1780 private->fcx_max_data = get_fcx_max_data(device);
1781
1782 readonly = dasd_device_is_ro(device);
1783 if (readonly)
1784 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1785
1786 dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1787 "with %d cylinders, %d heads, %d sectors%s\n",
1788 private->rdc_data.dev_type,
1789 private->rdc_data.dev_model,
1790 private->rdc_data.cu_type,
1791 private->rdc_data.cu_model.model,
1792 private->real_cyl,
1793 private->rdc_data.trk_per_cyl,
1794 private->rdc_data.sec_per_trk,
1795 readonly ? ", read-only device" : "");
1796 return 0;
1797
1798 out_err3:
1799 dasd_alias_disconnect_device_from_lcu(device);
1800 out_err2:
1801 dasd_free_block(device->block);
1802 device->block = NULL;
1803 out_err1:
1804 kfree(private->conf_data);
1805 kfree(device->private);
1806 device->private = NULL;
1807 return rc;
1808 }
1809
1810 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1811 {
1812 struct dasd_eckd_private *private;
1813
1814 private = (struct dasd_eckd_private *) device->private;
1815 dasd_alias_disconnect_device_from_lcu(device);
1816 private->ned = NULL;
1817 private->sneq = NULL;
1818 private->vdsneq = NULL;
1819 private->gneq = NULL;
1820 private->conf_len = 0;
1821 kfree(private->conf_data);
1822 private->conf_data = NULL;
1823 }
1824
1825 static struct dasd_ccw_req *
1826 dasd_eckd_analysis_ccw(struct dasd_device *device)
1827 {
1828 struct dasd_eckd_private *private;
1829 struct eckd_count *count_data;
1830 struct LO_eckd_data *LO_data;
1831 struct dasd_ccw_req *cqr;
1832 struct ccw1 *ccw;
1833 int cplength, datasize;
1834 int i;
1835
1836 private = (struct dasd_eckd_private *) device->private;
1837
1838 cplength = 8;
1839 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1840 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1841 if (IS_ERR(cqr))
1842 return cqr;
1843 ccw = cqr->cpaddr;
1844 /* Define extent for the first 3 tracks. */
1845 define_extent(ccw++, cqr->data, 0, 2,
1846 DASD_ECKD_CCW_READ_COUNT, device);
1847 LO_data = cqr->data + sizeof(struct DE_eckd_data);
1848 /* Locate record for the first 4 records on track 0. */
1849 ccw[-1].flags |= CCW_FLAG_CC;
1850 locate_record(ccw++, LO_data++, 0, 0, 4,
1851 DASD_ECKD_CCW_READ_COUNT, device, 0);
1852
1853 count_data = private->count_area;
1854 for (i = 0; i < 4; i++) {
1855 ccw[-1].flags |= CCW_FLAG_CC;
1856 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1857 ccw->flags = 0;
1858 ccw->count = 8;
1859 ccw->cda = (__u32)(addr_t) count_data;
1860 ccw++;
1861 count_data++;
1862 }
1863
1864 /* Locate record for the first record on track 2. */
1865 ccw[-1].flags |= CCW_FLAG_CC;
1866 locate_record(ccw++, LO_data++, 2, 0, 1,
1867 DASD_ECKD_CCW_READ_COUNT, device, 0);
1868 /* Read count ccw. */
1869 ccw[-1].flags |= CCW_FLAG_CC;
1870 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1871 ccw->flags = 0;
1872 ccw->count = 8;
1873 ccw->cda = (__u32)(addr_t) count_data;
1874
1875 cqr->block = NULL;
1876 cqr->startdev = device;
1877 cqr->memdev = device;
1878 cqr->retries = 255;
1879 cqr->buildclk = get_tod_clock();
1880 cqr->status = DASD_CQR_FILLED;
1881 return cqr;
1882 }
1883
1884 /* differentiate between 'no record found' and any other error */
1885 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1886 {
1887 char *sense;
1888 if (init_cqr->status == DASD_CQR_DONE)
1889 return INIT_CQR_OK;
1890 else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1891 init_cqr->status == DASD_CQR_FAILED) {
1892 sense = dasd_get_sense(&init_cqr->irb);
1893 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1894 return INIT_CQR_UNFORMATTED;
1895 else
1896 return INIT_CQR_ERROR;
1897 } else
1898 return INIT_CQR_ERROR;
1899 }
1900
1901 /*
1902 * This is the callback function for the init_analysis cqr. It saves
1903 * the status of the initial analysis ccw before it frees it and kicks
1904 * the device to continue the startup sequence. This will call
1905 * dasd_eckd_do_analysis again (if the devices has not been marked
1906 * for deletion in the meantime).
1907 */
1908 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1909 void *data)
1910 {
1911 struct dasd_eckd_private *private;
1912 struct dasd_device *device;
1913
1914 device = init_cqr->startdev;
1915 private = (struct dasd_eckd_private *) device->private;
1916 private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1917 dasd_sfree_request(init_cqr, device);
1918 dasd_kick_device(device);
1919 }
1920
1921 static int dasd_eckd_start_analysis(struct dasd_block *block)
1922 {
1923 struct dasd_ccw_req *init_cqr;
1924
1925 init_cqr = dasd_eckd_analysis_ccw(block->base);
1926 if (IS_ERR(init_cqr))
1927 return PTR_ERR(init_cqr);
1928 init_cqr->callback = dasd_eckd_analysis_callback;
1929 init_cqr->callback_data = NULL;
1930 init_cqr->expires = 5*HZ;
1931 /* first try without ERP, so we can later handle unformatted
1932 * devices as special case
1933 */
1934 clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1935 init_cqr->retries = 0;
1936 dasd_add_request_head(init_cqr);
1937 return -EAGAIN;
1938 }
1939
1940 static int dasd_eckd_end_analysis(struct dasd_block *block)
1941 {
1942 struct dasd_device *device;
1943 struct dasd_eckd_private *private;
1944 struct eckd_count *count_area;
1945 unsigned int sb, blk_per_trk;
1946 int status, i;
1947 struct dasd_ccw_req *init_cqr;
1948
1949 device = block->base;
1950 private = (struct dasd_eckd_private *) device->private;
1951 status = private->init_cqr_status;
1952 private->init_cqr_status = -1;
1953 if (status == INIT_CQR_ERROR) {
1954 /* try again, this time with full ERP */
1955 init_cqr = dasd_eckd_analysis_ccw(device);
1956 dasd_sleep_on(init_cqr);
1957 status = dasd_eckd_analysis_evaluation(init_cqr);
1958 dasd_sfree_request(init_cqr, device);
1959 }
1960
1961 if (device->features & DASD_FEATURE_USERAW) {
1962 block->bp_block = DASD_RAW_BLOCKSIZE;
1963 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1964 block->s2b_shift = 3;
1965 goto raw;
1966 }
1967
1968 if (status == INIT_CQR_UNFORMATTED) {
1969 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1970 return -EMEDIUMTYPE;
1971 } else if (status == INIT_CQR_ERROR) {
1972 dev_err(&device->cdev->dev,
1973 "Detecting the DASD disk layout failed because "
1974 "of an I/O error\n");
1975 return -EIO;
1976 }
1977
1978 private->uses_cdl = 1;
1979 /* Check Track 0 for Compatible Disk Layout */
1980 count_area = NULL;
1981 for (i = 0; i < 3; i++) {
1982 if (private->count_area[i].kl != 4 ||
1983 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1984 private->count_area[i].cyl != 0 ||
1985 private->count_area[i].head != count_area_head[i] ||
1986 private->count_area[i].record != count_area_rec[i]) {
1987 private->uses_cdl = 0;
1988 break;
1989 }
1990 }
1991 if (i == 3)
1992 count_area = &private->count_area[4];
1993
1994 if (private->uses_cdl == 0) {
1995 for (i = 0; i < 5; i++) {
1996 if ((private->count_area[i].kl != 0) ||
1997 (private->count_area[i].dl !=
1998 private->count_area[0].dl) ||
1999 private->count_area[i].cyl != 0 ||
2000 private->count_area[i].head != count_area_head[i] ||
2001 private->count_area[i].record != count_area_rec[i])
2002 break;
2003 }
2004 if (i == 5)
2005 count_area = &private->count_area[0];
2006 } else {
2007 if (private->count_area[3].record == 1)
2008 dev_warn(&device->cdev->dev,
2009 "Track 0 has no records following the VTOC\n");
2010 }
2011
2012 if (count_area != NULL && count_area->kl == 0) {
2013 /* we found notthing violating our disk layout */
2014 if (dasd_check_blocksize(count_area->dl) == 0)
2015 block->bp_block = count_area->dl;
2016 }
2017 if (block->bp_block == 0) {
2018 dev_warn(&device->cdev->dev,
2019 "The disk layout of the DASD is not supported\n");
2020 return -EMEDIUMTYPE;
2021 }
2022 block->s2b_shift = 0; /* bits to shift 512 to get a block */
2023 for (sb = 512; sb < block->bp_block; sb = sb << 1)
2024 block->s2b_shift++;
2025
2026 blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2027
2028 raw:
2029 block->blocks = (private->real_cyl *
2030 private->rdc_data.trk_per_cyl *
2031 blk_per_trk);
2032
2033 dev_info(&device->cdev->dev,
2034 "DASD with %d KB/block, %d KB total size, %d KB/track, "
2035 "%s\n", (block->bp_block >> 10),
2036 ((private->real_cyl *
2037 private->rdc_data.trk_per_cyl *
2038 blk_per_trk * (block->bp_block >> 9)) >> 1),
2039 ((blk_per_trk * block->bp_block) >> 10),
2040 private->uses_cdl ?
2041 "compatible disk layout" : "linux disk layout");
2042
2043 return 0;
2044 }
2045
2046 static int dasd_eckd_do_analysis(struct dasd_block *block)
2047 {
2048 struct dasd_eckd_private *private;
2049
2050 private = (struct dasd_eckd_private *) block->base->private;
2051 if (private->init_cqr_status < 0)
2052 return dasd_eckd_start_analysis(block);
2053 else
2054 return dasd_eckd_end_analysis(block);
2055 }
2056
2057 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2058 {
2059 return dasd_alias_add_device(device);
2060 };
2061
2062 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2063 {
2064 cancel_work_sync(&device->reload_device);
2065 cancel_work_sync(&device->kick_validate);
2066 return 0;
2067 };
2068
2069 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2070 {
2071 return dasd_alias_remove_device(device);
2072 };
2073
2074 static int
2075 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2076 {
2077 struct dasd_eckd_private *private;
2078
2079 private = (struct dasd_eckd_private *) block->base->private;
2080 if (dasd_check_blocksize(block->bp_block) == 0) {
2081 geo->sectors = recs_per_track(&private->rdc_data,
2082 0, block->bp_block);
2083 }
2084 geo->cylinders = private->rdc_data.no_cyl;
2085 geo->heads = private->rdc_data.trk_per_cyl;
2086 return 0;
2087 }
2088
2089 static struct dasd_ccw_req *
2090 dasd_eckd_build_format(struct dasd_device *base,
2091 struct format_data_t *fdata,
2092 int enable_pav)
2093 {
2094 struct dasd_eckd_private *base_priv;
2095 struct dasd_eckd_private *start_priv;
2096 struct dasd_device *startdev = NULL;
2097 struct dasd_ccw_req *fcp;
2098 struct eckd_count *ect;
2099 struct ch_t address;
2100 struct ccw1 *ccw;
2101 void *data;
2102 int rpt;
2103 int cplength, datasize;
2104 int i, j;
2105 int intensity = 0;
2106 int r0_perm;
2107 int nr_tracks;
2108 int use_prefix;
2109
2110 if (enable_pav)
2111 startdev = dasd_alias_get_start_dev(base);
2112
2113 if (!startdev)
2114 startdev = base;
2115
2116 start_priv = (struct dasd_eckd_private *) startdev->private;
2117 base_priv = (struct dasd_eckd_private *) base->private;
2118
2119 rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2120
2121 nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2122
2123 /*
2124 * fdata->intensity is a bit string that tells us what to do:
2125 * Bit 0: write record zero
2126 * Bit 1: write home address, currently not supported
2127 * Bit 2: invalidate tracks
2128 * Bit 3: use OS/390 compatible disk layout (cdl)
2129 * Bit 4: do not allow storage subsystem to modify record zero
2130 * Only some bit combinations do make sense.
2131 */
2132 if (fdata->intensity & 0x10) {
2133 r0_perm = 0;
2134 intensity = fdata->intensity & ~0x10;
2135 } else {
2136 r0_perm = 1;
2137 intensity = fdata->intensity;
2138 }
2139
2140 use_prefix = base_priv->features.feature[8] & 0x01;
2141
2142 switch (intensity) {
2143 case 0x00: /* Normal format */
2144 case 0x08: /* Normal format, use cdl. */
2145 cplength = 2 + (rpt*nr_tracks);
2146 if (use_prefix)
2147 datasize = sizeof(struct PFX_eckd_data) +
2148 sizeof(struct LO_eckd_data) +
2149 rpt * nr_tracks * sizeof(struct eckd_count);
2150 else
2151 datasize = sizeof(struct DE_eckd_data) +
2152 sizeof(struct LO_eckd_data) +
2153 rpt * nr_tracks * sizeof(struct eckd_count);
2154 break;
2155 case 0x01: /* Write record zero and format track. */
2156 case 0x09: /* Write record zero and format track, use cdl. */
2157 cplength = 2 + rpt * nr_tracks;
2158 if (use_prefix)
2159 datasize = sizeof(struct PFX_eckd_data) +
2160 sizeof(struct LO_eckd_data) +
2161 sizeof(struct eckd_count) +
2162 rpt * nr_tracks * sizeof(struct eckd_count);
2163 else
2164 datasize = sizeof(struct DE_eckd_data) +
2165 sizeof(struct LO_eckd_data) +
2166 sizeof(struct eckd_count) +
2167 rpt * nr_tracks * sizeof(struct eckd_count);
2168 break;
2169 case 0x04: /* Invalidate track. */
2170 case 0x0c: /* Invalidate track, use cdl. */
2171 cplength = 3;
2172 if (use_prefix)
2173 datasize = sizeof(struct PFX_eckd_data) +
2174 sizeof(struct LO_eckd_data) +
2175 sizeof(struct eckd_count);
2176 else
2177 datasize = sizeof(struct DE_eckd_data) +
2178 sizeof(struct LO_eckd_data) +
2179 sizeof(struct eckd_count);
2180 break;
2181 default:
2182 dev_warn(&startdev->cdev->dev,
2183 "An I/O control call used incorrect flags 0x%x\n",
2184 fdata->intensity);
2185 return ERR_PTR(-EINVAL);
2186 }
2187 /* Allocate the format ccw request. */
2188 fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2189 datasize, startdev);
2190 if (IS_ERR(fcp))
2191 return fcp;
2192
2193 start_priv->count++;
2194 data = fcp->data;
2195 ccw = fcp->cpaddr;
2196
2197 switch (intensity & ~0x08) {
2198 case 0x00: /* Normal format. */
2199 if (use_prefix) {
2200 prefix(ccw++, (struct PFX_eckd_data *) data,
2201 fdata->start_unit, fdata->stop_unit,
2202 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2203 /* grant subsystem permission to format R0 */
2204 if (r0_perm)
2205 ((struct PFX_eckd_data *)data)
2206 ->define_extent.ga_extended |= 0x04;
2207 data += sizeof(struct PFX_eckd_data);
2208 } else {
2209 define_extent(ccw++, (struct DE_eckd_data *) data,
2210 fdata->start_unit, fdata->stop_unit,
2211 DASD_ECKD_CCW_WRITE_CKD, startdev);
2212 /* grant subsystem permission to format R0 */
2213 if (r0_perm)
2214 ((struct DE_eckd_data *) data)
2215 ->ga_extended |= 0x04;
2216 data += sizeof(struct DE_eckd_data);
2217 }
2218 ccw[-1].flags |= CCW_FLAG_CC;
2219 locate_record(ccw++, (struct LO_eckd_data *) data,
2220 fdata->start_unit, 0, rpt*nr_tracks,
2221 DASD_ECKD_CCW_WRITE_CKD, base,
2222 fdata->blksize);
2223 data += sizeof(struct LO_eckd_data);
2224 break;
2225 case 0x01: /* Write record zero + format track. */
2226 if (use_prefix) {
2227 prefix(ccw++, (struct PFX_eckd_data *) data,
2228 fdata->start_unit, fdata->stop_unit,
2229 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2230 base, startdev);
2231 data += sizeof(struct PFX_eckd_data);
2232 } else {
2233 define_extent(ccw++, (struct DE_eckd_data *) data,
2234 fdata->start_unit, fdata->stop_unit,
2235 DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev);
2236 data += sizeof(struct DE_eckd_data);
2237 }
2238 ccw[-1].flags |= CCW_FLAG_CC;
2239 locate_record(ccw++, (struct LO_eckd_data *) data,
2240 fdata->start_unit, 0, rpt * nr_tracks + 1,
2241 DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2242 base->block->bp_block);
2243 data += sizeof(struct LO_eckd_data);
2244 break;
2245 case 0x04: /* Invalidate track. */
2246 if (use_prefix) {
2247 prefix(ccw++, (struct PFX_eckd_data *) data,
2248 fdata->start_unit, fdata->stop_unit,
2249 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2250 data += sizeof(struct PFX_eckd_data);
2251 } else {
2252 define_extent(ccw++, (struct DE_eckd_data *) data,
2253 fdata->start_unit, fdata->stop_unit,
2254 DASD_ECKD_CCW_WRITE_CKD, startdev);
2255 data += sizeof(struct DE_eckd_data);
2256 }
2257 ccw[-1].flags |= CCW_FLAG_CC;
2258 locate_record(ccw++, (struct LO_eckd_data *) data,
2259 fdata->start_unit, 0, 1,
2260 DASD_ECKD_CCW_WRITE_CKD, base, 8);
2261 data += sizeof(struct LO_eckd_data);
2262 break;
2263 }
2264
2265 for (j = 0; j < nr_tracks; j++) {
2266 /* calculate cylinder and head for the current track */
2267 set_ch_t(&address,
2268 (fdata->start_unit + j) /
2269 base_priv->rdc_data.trk_per_cyl,
2270 (fdata->start_unit + j) %
2271 base_priv->rdc_data.trk_per_cyl);
2272 if (intensity & 0x01) { /* write record zero */
2273 ect = (struct eckd_count *) data;
2274 data += sizeof(struct eckd_count);
2275 ect->cyl = address.cyl;
2276 ect->head = address.head;
2277 ect->record = 0;
2278 ect->kl = 0;
2279 ect->dl = 8;
2280 ccw[-1].flags |= CCW_FLAG_CC;
2281 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2282 ccw->flags = CCW_FLAG_SLI;
2283 ccw->count = 8;
2284 ccw->cda = (__u32)(addr_t) ect;
2285 ccw++;
2286 }
2287 if ((intensity & ~0x08) & 0x04) { /* erase track */
2288 ect = (struct eckd_count *) data;
2289 data += sizeof(struct eckd_count);
2290 ect->cyl = address.cyl;
2291 ect->head = address.head;
2292 ect->record = 1;
2293 ect->kl = 0;
2294 ect->dl = 0;
2295 ccw[-1].flags |= CCW_FLAG_CC;
2296 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2297 ccw->flags = CCW_FLAG_SLI;
2298 ccw->count = 8;
2299 ccw->cda = (__u32)(addr_t) ect;
2300 } else { /* write remaining records */
2301 for (i = 0; i < rpt; i++) {
2302 ect = (struct eckd_count *) data;
2303 data += sizeof(struct eckd_count);
2304 ect->cyl = address.cyl;
2305 ect->head = address.head;
2306 ect->record = i + 1;
2307 ect->kl = 0;
2308 ect->dl = fdata->blksize;
2309 /*
2310 * Check for special tracks 0-1
2311 * when formatting CDL
2312 */
2313 if ((intensity & 0x08) &&
2314 fdata->start_unit == 0) {
2315 if (i < 3) {
2316 ect->kl = 4;
2317 ect->dl = sizes_trk0[i] - 4;
2318 }
2319 }
2320 if ((intensity & 0x08) &&
2321 fdata->start_unit == 1) {
2322 ect->kl = 44;
2323 ect->dl = LABEL_SIZE - 44;
2324 }
2325 ccw[-1].flags |= CCW_FLAG_CC;
2326 if (i != 0 || j == 0)
2327 ccw->cmd_code =
2328 DASD_ECKD_CCW_WRITE_CKD;
2329 else
2330 ccw->cmd_code =
2331 DASD_ECKD_CCW_WRITE_CKD_MT;
2332 ccw->flags = CCW_FLAG_SLI;
2333 ccw->count = 8;
2334 ccw->cda = (__u32)(addr_t) ect;
2335 ccw++;
2336 }
2337 }
2338 }
2339
2340 fcp->startdev = startdev;
2341 fcp->memdev = startdev;
2342 fcp->basedev = base;
2343 fcp->retries = 256;
2344 fcp->expires = startdev->default_expires * HZ;
2345 fcp->buildclk = get_tod_clock();
2346 fcp->status = DASD_CQR_FILLED;
2347
2348 return fcp;
2349 }
2350
2351 static int
2352 dasd_eckd_format_device(struct dasd_device *base,
2353 struct format_data_t *fdata,
2354 int enable_pav)
2355 {
2356 struct dasd_ccw_req *cqr, *n;
2357 struct dasd_block *block;
2358 struct dasd_eckd_private *private;
2359 struct list_head format_queue;
2360 struct dasd_device *device;
2361 int old_stop, format_step;
2362 int step, rc = 0, sleep_rc;
2363
2364 block = base->block;
2365 private = (struct dasd_eckd_private *) base->private;
2366
2367 /* Sanity checks. */
2368 if (fdata->start_unit >=
2369 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2370 dev_warn(&base->cdev->dev,
2371 "Start track number %u used in formatting is too big\n",
2372 fdata->start_unit);
2373 return -EINVAL;
2374 }
2375 if (fdata->stop_unit >=
2376 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2377 dev_warn(&base->cdev->dev,
2378 "Stop track number %u used in formatting is too big\n",
2379 fdata->stop_unit);
2380 return -EINVAL;
2381 }
2382 if (fdata->start_unit > fdata->stop_unit) {
2383 dev_warn(&base->cdev->dev,
2384 "Start track %u used in formatting exceeds end track\n",
2385 fdata->start_unit);
2386 return -EINVAL;
2387 }
2388 if (dasd_check_blocksize(fdata->blksize) != 0) {
2389 dev_warn(&base->cdev->dev,
2390 "The DASD cannot be formatted with block size %u\n",
2391 fdata->blksize);
2392 return -EINVAL;
2393 }
2394
2395 INIT_LIST_HEAD(&format_queue);
2396
2397 old_stop = fdata->stop_unit;
2398 while (fdata->start_unit <= 1) {
2399 fdata->stop_unit = fdata->start_unit;
2400 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2401 list_add(&cqr->blocklist, &format_queue);
2402
2403 fdata->stop_unit = old_stop;
2404 fdata->start_unit++;
2405
2406 if (fdata->start_unit > fdata->stop_unit)
2407 goto sleep;
2408 }
2409
2410 retry:
2411 format_step = 255 / recs_per_track(&private->rdc_data, 0,
2412 fdata->blksize);
2413 while (fdata->start_unit <= old_stop) {
2414 step = fdata->stop_unit - fdata->start_unit + 1;
2415 if (step > format_step)
2416 fdata->stop_unit = fdata->start_unit + format_step - 1;
2417
2418 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2419 if (IS_ERR(cqr)) {
2420 if (PTR_ERR(cqr) == -ENOMEM) {
2421 /*
2422 * not enough memory available
2423 * go to out and start requests
2424 * retry after first requests were finished
2425 */
2426 fdata->stop_unit = old_stop;
2427 goto sleep;
2428 } else
2429 return PTR_ERR(cqr);
2430 }
2431 list_add(&cqr->blocklist, &format_queue);
2432
2433 fdata->start_unit = fdata->stop_unit + 1;
2434 fdata->stop_unit = old_stop;
2435 }
2436
2437 sleep:
2438 sleep_rc = dasd_sleep_on_queue(&format_queue);
2439
2440 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2441 device = cqr->startdev;
2442 private = (struct dasd_eckd_private *) device->private;
2443 if (cqr->status == DASD_CQR_FAILED)
2444 rc = -EIO;
2445 list_del_init(&cqr->blocklist);
2446 dasd_sfree_request(cqr, device);
2447 private->count--;
2448 }
2449
2450 if (sleep_rc)
2451 return sleep_rc;
2452
2453 /*
2454 * in case of ENOMEM we need to retry after
2455 * first requests are finished
2456 */
2457 if (fdata->start_unit <= fdata->stop_unit)
2458 goto retry;
2459
2460 return rc;
2461 }
2462
2463 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2464 {
2465 if (cqr->retries < 0) {
2466 cqr->status = DASD_CQR_FAILED;
2467 return;
2468 }
2469 cqr->status = DASD_CQR_FILLED;
2470 if (cqr->block && (cqr->startdev != cqr->block->base)) {
2471 dasd_eckd_reset_ccw_to_base_io(cqr);
2472 cqr->startdev = cqr->block->base;
2473 cqr->lpm = cqr->block->base->path_data.opm;
2474 }
2475 };
2476
2477 static dasd_erp_fn_t
2478 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2479 {
2480 struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2481 struct ccw_device *cdev = device->cdev;
2482
2483 switch (cdev->id.cu_type) {
2484 case 0x3990:
2485 case 0x2105:
2486 case 0x2107:
2487 case 0x1750:
2488 return dasd_3990_erp_action;
2489 case 0x9343:
2490 case 0x3880:
2491 default:
2492 return dasd_default_erp_action;
2493 }
2494 }
2495
2496 static dasd_erp_fn_t
2497 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2498 {
2499 return dasd_default_erp_postaction;
2500 }
2501
2502 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2503 struct dasd_ccw_req *cqr,
2504 struct irb *irb)
2505 {
2506 char mask;
2507 char *sense = NULL;
2508 struct dasd_eckd_private *private;
2509
2510 private = (struct dasd_eckd_private *) device->private;
2511 /* first of all check for state change pending interrupt */
2512 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2513 if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2514 /*
2515 * for alias only, not in offline processing
2516 * and only if not suspended
2517 */
2518 if (!device->block && private->lcu &&
2519 device->state == DASD_STATE_ONLINE &&
2520 !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2521 !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2522 /*
2523 * the state change could be caused by an alias
2524 * reassignment remove device from alias handling
2525 * to prevent new requests from being scheduled on
2526 * the wrong alias device
2527 */
2528 dasd_alias_remove_device(device);
2529
2530 /* schedule worker to reload device */
2531 dasd_reload_device(device);
2532 }
2533 dasd_generic_handle_state_change(device);
2534 return;
2535 }
2536
2537 sense = dasd_get_sense(irb);
2538 if (!sense)
2539 return;
2540
2541 /* summary unit check */
2542 if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2543 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2544 dasd_alias_handle_summary_unit_check(device, irb);
2545 return;
2546 }
2547
2548 /* service information message SIM */
2549 if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2550 ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2551 dasd_3990_erp_handle_sim(device, sense);
2552 return;
2553 }
2554
2555 /* loss of device reservation is handled via base devices only
2556 * as alias devices may be used with several bases
2557 */
2558 if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2559 (sense[7] == 0x3F) &&
2560 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2561 test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2562 if (device->features & DASD_FEATURE_FAILONSLCK)
2563 set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2564 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2565 dev_err(&device->cdev->dev,
2566 "The device reservation was lost\n");
2567 }
2568 }
2569
2570 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2571 struct dasd_device *startdev,
2572 struct dasd_block *block,
2573 struct request *req,
2574 sector_t first_rec,
2575 sector_t last_rec,
2576 sector_t first_trk,
2577 sector_t last_trk,
2578 unsigned int first_offs,
2579 unsigned int last_offs,
2580 unsigned int blk_per_trk,
2581 unsigned int blksize)
2582 {
2583 struct dasd_eckd_private *private;
2584 unsigned long *idaws;
2585 struct LO_eckd_data *LO_data;
2586 struct dasd_ccw_req *cqr;
2587 struct ccw1 *ccw;
2588 struct req_iterator iter;
2589 struct bio_vec bv;
2590 char *dst;
2591 unsigned int off;
2592 int count, cidaw, cplength, datasize;
2593 sector_t recid;
2594 unsigned char cmd, rcmd;
2595 int use_prefix;
2596 struct dasd_device *basedev;
2597
2598 basedev = block->base;
2599 private = (struct dasd_eckd_private *) basedev->private;
2600 if (rq_data_dir(req) == READ)
2601 cmd = DASD_ECKD_CCW_READ_MT;
2602 else if (rq_data_dir(req) == WRITE)
2603 cmd = DASD_ECKD_CCW_WRITE_MT;
2604 else
2605 return ERR_PTR(-EINVAL);
2606
2607 /* Check struct bio and count the number of blocks for the request. */
2608 count = 0;
2609 cidaw = 0;
2610 rq_for_each_segment(bv, req, iter) {
2611 if (bv.bv_len & (blksize - 1))
2612 /* Eckd can only do full blocks. */
2613 return ERR_PTR(-EINVAL);
2614 count += bv.bv_len >> (block->s2b_shift + 9);
2615 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
2616 cidaw += bv.bv_len >> (block->s2b_shift + 9);
2617 }
2618 /* Paranoia. */
2619 if (count != last_rec - first_rec + 1)
2620 return ERR_PTR(-EINVAL);
2621
2622 /* use the prefix command if available */
2623 use_prefix = private->features.feature[8] & 0x01;
2624 if (use_prefix) {
2625 /* 1x prefix + number of blocks */
2626 cplength = 2 + count;
2627 /* 1x prefix + cidaws*sizeof(long) */
2628 datasize = sizeof(struct PFX_eckd_data) +
2629 sizeof(struct LO_eckd_data) +
2630 cidaw * sizeof(unsigned long);
2631 } else {
2632 /* 1x define extent + 1x locate record + number of blocks */
2633 cplength = 2 + count;
2634 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2635 datasize = sizeof(struct DE_eckd_data) +
2636 sizeof(struct LO_eckd_data) +
2637 cidaw * sizeof(unsigned long);
2638 }
2639 /* Find out the number of additional locate record ccws for cdl. */
2640 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2641 if (last_rec >= 2*blk_per_trk)
2642 count = 2*blk_per_trk - first_rec;
2643 cplength += count;
2644 datasize += count*sizeof(struct LO_eckd_data);
2645 }
2646 /* Allocate the ccw request. */
2647 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2648 startdev);
2649 if (IS_ERR(cqr))
2650 return cqr;
2651 ccw = cqr->cpaddr;
2652 /* First ccw is define extent or prefix. */
2653 if (use_prefix) {
2654 if (prefix(ccw++, cqr->data, first_trk,
2655 last_trk, cmd, basedev, startdev) == -EAGAIN) {
2656 /* Clock not in sync and XRC is enabled.
2657 * Try again later.
2658 */
2659 dasd_sfree_request(cqr, startdev);
2660 return ERR_PTR(-EAGAIN);
2661 }
2662 idaws = (unsigned long *) (cqr->data +
2663 sizeof(struct PFX_eckd_data));
2664 } else {
2665 if (define_extent(ccw++, cqr->data, first_trk,
2666 last_trk, cmd, basedev) == -EAGAIN) {
2667 /* Clock not in sync and XRC is enabled.
2668 * Try again later.
2669 */
2670 dasd_sfree_request(cqr, startdev);
2671 return ERR_PTR(-EAGAIN);
2672 }
2673 idaws = (unsigned long *) (cqr->data +
2674 sizeof(struct DE_eckd_data));
2675 }
2676 /* Build locate_record+read/write/ccws. */
2677 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2678 recid = first_rec;
2679 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2680 /* Only standard blocks so there is just one locate record. */
2681 ccw[-1].flags |= CCW_FLAG_CC;
2682 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2683 last_rec - recid + 1, cmd, basedev, blksize);
2684 }
2685 rq_for_each_segment(bv, req, iter) {
2686 dst = page_address(bv.bv_page) + bv.bv_offset;
2687 if (dasd_page_cache) {
2688 char *copy = kmem_cache_alloc(dasd_page_cache,
2689 GFP_DMA | __GFP_NOWARN);
2690 if (copy && rq_data_dir(req) == WRITE)
2691 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
2692 if (copy)
2693 dst = copy + bv.bv_offset;
2694 }
2695 for (off = 0; off < bv.bv_len; off += blksize) {
2696 sector_t trkid = recid;
2697 unsigned int recoffs = sector_div(trkid, blk_per_trk);
2698 rcmd = cmd;
2699 count = blksize;
2700 /* Locate record for cdl special block ? */
2701 if (private->uses_cdl && recid < 2*blk_per_trk) {
2702 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2703 rcmd |= 0x8;
2704 count = dasd_eckd_cdl_reclen(recid);
2705 if (count < blksize &&
2706 rq_data_dir(req) == READ)
2707 memset(dst + count, 0xe5,
2708 blksize - count);
2709 }
2710 ccw[-1].flags |= CCW_FLAG_CC;
2711 locate_record(ccw++, LO_data++,
2712 trkid, recoffs + 1,
2713 1, rcmd, basedev, count);
2714 }
2715 /* Locate record for standard blocks ? */
2716 if (private->uses_cdl && recid == 2*blk_per_trk) {
2717 ccw[-1].flags |= CCW_FLAG_CC;
2718 locate_record(ccw++, LO_data++,
2719 trkid, recoffs + 1,
2720 last_rec - recid + 1,
2721 cmd, basedev, count);
2722 }
2723 /* Read/write ccw. */
2724 ccw[-1].flags |= CCW_FLAG_CC;
2725 ccw->cmd_code = rcmd;
2726 ccw->count = count;
2727 if (idal_is_needed(dst, blksize)) {
2728 ccw->cda = (__u32)(addr_t) idaws;
2729 ccw->flags = CCW_FLAG_IDA;
2730 idaws = idal_create_words(idaws, dst, blksize);
2731 } else {
2732 ccw->cda = (__u32)(addr_t) dst;
2733 ccw->flags = 0;
2734 }
2735 ccw++;
2736 dst += blksize;
2737 recid++;
2738 }
2739 }
2740 if (blk_noretry_request(req) ||
2741 block->base->features & DASD_FEATURE_FAILFAST)
2742 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2743 cqr->startdev = startdev;
2744 cqr->memdev = startdev;
2745 cqr->block = block;
2746 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2747 cqr->lpm = startdev->path_data.ppm;
2748 cqr->retries = startdev->default_retries;
2749 cqr->buildclk = get_tod_clock();
2750 cqr->status = DASD_CQR_FILLED;
2751 return cqr;
2752 }
2753
2754 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2755 struct dasd_device *startdev,
2756 struct dasd_block *block,
2757 struct request *req,
2758 sector_t first_rec,
2759 sector_t last_rec,
2760 sector_t first_trk,
2761 sector_t last_trk,
2762 unsigned int first_offs,
2763 unsigned int last_offs,
2764 unsigned int blk_per_trk,
2765 unsigned int blksize)
2766 {
2767 unsigned long *idaws;
2768 struct dasd_ccw_req *cqr;
2769 struct ccw1 *ccw;
2770 struct req_iterator iter;
2771 struct bio_vec bv;
2772 char *dst, *idaw_dst;
2773 unsigned int cidaw, cplength, datasize;
2774 unsigned int tlf;
2775 sector_t recid;
2776 unsigned char cmd;
2777 struct dasd_device *basedev;
2778 unsigned int trkcount, count, count_to_trk_end;
2779 unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2780 unsigned char new_track, end_idaw;
2781 sector_t trkid;
2782 unsigned int recoffs;
2783
2784 basedev = block->base;
2785 if (rq_data_dir(req) == READ)
2786 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2787 else if (rq_data_dir(req) == WRITE)
2788 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2789 else
2790 return ERR_PTR(-EINVAL);
2791
2792 /* Track based I/O needs IDAWs for each page, and not just for
2793 * 64 bit addresses. We need additional idals for pages
2794 * that get filled from two tracks, so we use the number
2795 * of records as upper limit.
2796 */
2797 cidaw = last_rec - first_rec + 1;
2798 trkcount = last_trk - first_trk + 1;
2799
2800 /* 1x prefix + one read/write ccw per track */
2801 cplength = 1 + trkcount;
2802
2803 /* on 31-bit we need space for two 32 bit addresses per page
2804 * on 64-bit one 64 bit address
2805 */
2806 datasize = sizeof(struct PFX_eckd_data) +
2807 cidaw * sizeof(unsigned long long);
2808
2809 /* Allocate the ccw request. */
2810 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2811 startdev);
2812 if (IS_ERR(cqr))
2813 return cqr;
2814 ccw = cqr->cpaddr;
2815 /* transfer length factor: how many bytes to read from the last track */
2816 if (first_trk == last_trk)
2817 tlf = last_offs - first_offs + 1;
2818 else
2819 tlf = last_offs + 1;
2820 tlf *= blksize;
2821
2822 if (prefix_LRE(ccw++, cqr->data, first_trk,
2823 last_trk, cmd, basedev, startdev,
2824 1 /* format */, first_offs + 1,
2825 trkcount, blksize,
2826 tlf) == -EAGAIN) {
2827 /* Clock not in sync and XRC is enabled.
2828 * Try again later.
2829 */
2830 dasd_sfree_request(cqr, startdev);
2831 return ERR_PTR(-EAGAIN);
2832 }
2833
2834 /*
2835 * The translation of request into ccw programs must meet the
2836 * following conditions:
2837 * - all idaws but the first and the last must address full pages
2838 * (or 2K blocks on 31-bit)
2839 * - the scope of a ccw and it's idal ends with the track boundaries
2840 */
2841 idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2842 recid = first_rec;
2843 new_track = 1;
2844 end_idaw = 0;
2845 len_to_track_end = 0;
2846 idaw_dst = NULL;
2847 idaw_len = 0;
2848 rq_for_each_segment(bv, req, iter) {
2849 dst = page_address(bv.bv_page) + bv.bv_offset;
2850 seg_len = bv.bv_len;
2851 while (seg_len) {
2852 if (new_track) {
2853 trkid = recid;
2854 recoffs = sector_div(trkid, blk_per_trk);
2855 count_to_trk_end = blk_per_trk - recoffs;
2856 count = min((last_rec - recid + 1),
2857 (sector_t)count_to_trk_end);
2858 len_to_track_end = count * blksize;
2859 ccw[-1].flags |= CCW_FLAG_CC;
2860 ccw->cmd_code = cmd;
2861 ccw->count = len_to_track_end;
2862 ccw->cda = (__u32)(addr_t)idaws;
2863 ccw->flags = CCW_FLAG_IDA;
2864 ccw++;
2865 recid += count;
2866 new_track = 0;
2867 /* first idaw for a ccw may start anywhere */
2868 if (!idaw_dst)
2869 idaw_dst = dst;
2870 }
2871 /* If we start a new idaw, we must make sure that it
2872 * starts on an IDA_BLOCK_SIZE boundary.
2873 * If we continue an idaw, we must make sure that the
2874 * current segment begins where the so far accumulated
2875 * idaw ends
2876 */
2877 if (!idaw_dst) {
2878 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2879 dasd_sfree_request(cqr, startdev);
2880 return ERR_PTR(-ERANGE);
2881 } else
2882 idaw_dst = dst;
2883 }
2884 if ((idaw_dst + idaw_len) != dst) {
2885 dasd_sfree_request(cqr, startdev);
2886 return ERR_PTR(-ERANGE);
2887 }
2888 part_len = min(seg_len, len_to_track_end);
2889 seg_len -= part_len;
2890 dst += part_len;
2891 idaw_len += part_len;
2892 len_to_track_end -= part_len;
2893 /* collected memory area ends on an IDA_BLOCK border,
2894 * -> create an idaw
2895 * idal_create_words will handle cases where idaw_len
2896 * is larger then IDA_BLOCK_SIZE
2897 */
2898 if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2899 end_idaw = 1;
2900 /* We also need to end the idaw at track end */
2901 if (!len_to_track_end) {
2902 new_track = 1;
2903 end_idaw = 1;
2904 }
2905 if (end_idaw) {
2906 idaws = idal_create_words(idaws, idaw_dst,
2907 idaw_len);
2908 idaw_dst = NULL;
2909 idaw_len = 0;
2910 end_idaw = 0;
2911 }
2912 }
2913 }
2914
2915 if (blk_noretry_request(req) ||
2916 block->base->features & DASD_FEATURE_FAILFAST)
2917 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2918 cqr->startdev = startdev;
2919 cqr->memdev = startdev;
2920 cqr->block = block;
2921 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2922 cqr->lpm = startdev->path_data.ppm;
2923 cqr->retries = startdev->default_retries;
2924 cqr->buildclk = get_tod_clock();
2925 cqr->status = DASD_CQR_FILLED;
2926 return cqr;
2927 }
2928
2929 static int prepare_itcw(struct itcw *itcw,
2930 unsigned int trk, unsigned int totrk, int cmd,
2931 struct dasd_device *basedev,
2932 struct dasd_device *startdev,
2933 unsigned int rec_on_trk, int count,
2934 unsigned int blksize,
2935 unsigned int total_data_size,
2936 unsigned int tlf,
2937 unsigned int blk_per_trk)
2938 {
2939 struct PFX_eckd_data pfxdata;
2940 struct dasd_eckd_private *basepriv, *startpriv;
2941 struct DE_eckd_data *dedata;
2942 struct LRE_eckd_data *lredata;
2943 struct dcw *dcw;
2944
2945 u32 begcyl, endcyl;
2946 u16 heads, beghead, endhead;
2947 u8 pfx_cmd;
2948
2949 int rc = 0;
2950 int sector = 0;
2951 int dn, d;
2952
2953
2954 /* setup prefix data */
2955 basepriv = (struct dasd_eckd_private *) basedev->private;
2956 startpriv = (struct dasd_eckd_private *) startdev->private;
2957 dedata = &pfxdata.define_extent;
2958 lredata = &pfxdata.locate_record;
2959
2960 memset(&pfxdata, 0, sizeof(pfxdata));
2961 pfxdata.format = 1; /* PFX with LRE */
2962 pfxdata.base_address = basepriv->ned->unit_addr;
2963 pfxdata.base_lss = basepriv->ned->ID;
2964 pfxdata.validity.define_extent = 1;
2965
2966 /* private uid is kept up to date, conf_data may be outdated */
2967 if (startpriv->uid.type != UA_BASE_DEVICE) {
2968 pfxdata.validity.verify_base = 1;
2969 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2970 pfxdata.validity.hyper_pav = 1;
2971 }
2972
2973 switch (cmd) {
2974 case DASD_ECKD_CCW_READ_TRACK_DATA:
2975 dedata->mask.perm = 0x1;
2976 dedata->attributes.operation = basepriv->attrib.operation;
2977 dedata->blk_size = blksize;
2978 dedata->ga_extended |= 0x42;
2979 lredata->operation.orientation = 0x0;
2980 lredata->operation.operation = 0x0C;
2981 lredata->auxiliary.check_bytes = 0x01;
2982 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2983 break;
2984 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2985 dedata->mask.perm = 0x02;
2986 dedata->attributes.operation = basepriv->attrib.operation;
2987 dedata->blk_size = blksize;
2988 rc = check_XRC_on_prefix(&pfxdata, basedev);
2989 dedata->ga_extended |= 0x42;
2990 lredata->operation.orientation = 0x0;
2991 lredata->operation.operation = 0x3F;
2992 lredata->extended_operation = 0x23;
2993 lredata->auxiliary.check_bytes = 0x2;
2994 pfx_cmd = DASD_ECKD_CCW_PFX;
2995 break;
2996 default:
2997 DBF_DEV_EVENT(DBF_ERR, basedev,
2998 "prepare itcw, unknown opcode 0x%x", cmd);
2999 BUG();
3000 break;
3001 }
3002 if (rc)
3003 return rc;
3004
3005 dedata->attributes.mode = 0x3; /* ECKD */
3006
3007 heads = basepriv->rdc_data.trk_per_cyl;
3008 begcyl = trk / heads;
3009 beghead = trk % heads;
3010 endcyl = totrk / heads;
3011 endhead = totrk % heads;
3012
3013 /* check for sequential prestage - enhance cylinder range */
3014 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3015 dedata->attributes.operation == DASD_SEQ_ACCESS) {
3016
3017 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3018 endcyl += basepriv->attrib.nr_cyl;
3019 else
3020 endcyl = (basepriv->real_cyl - 1);
3021 }
3022
3023 set_ch_t(&dedata->beg_ext, begcyl, beghead);
3024 set_ch_t(&dedata->end_ext, endcyl, endhead);
3025
3026 dedata->ep_format = 0x20; /* records per track is valid */
3027 dedata->ep_rec_per_track = blk_per_trk;
3028
3029 if (rec_on_trk) {
3030 switch (basepriv->rdc_data.dev_type) {
3031 case 0x3390:
3032 dn = ceil_quot(blksize + 6, 232);
3033 d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3034 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3035 break;
3036 case 0x3380:
3037 d = 7 + ceil_quot(blksize + 12, 32);
3038 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3039 break;
3040 }
3041 }
3042
3043 lredata->auxiliary.length_valid = 1;
3044 lredata->auxiliary.length_scope = 1;
3045 lredata->auxiliary.imbedded_ccw_valid = 1;
3046 lredata->length = tlf;
3047 lredata->imbedded_ccw = cmd;
3048 lredata->count = count;
3049 lredata->sector = sector;
3050 set_ch_t(&lredata->seek_addr, begcyl, beghead);
3051 lredata->search_arg.cyl = lredata->seek_addr.cyl;
3052 lredata->search_arg.head = lredata->seek_addr.head;
3053 lredata->search_arg.record = rec_on_trk;
3054
3055 dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3056 &pfxdata, sizeof(pfxdata), total_data_size);
3057 return PTR_RET(dcw);
3058 }
3059
3060 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3061 struct dasd_device *startdev,
3062 struct dasd_block *block,
3063 struct request *req,
3064 sector_t first_rec,
3065 sector_t last_rec,
3066 sector_t first_trk,
3067 sector_t last_trk,
3068 unsigned int first_offs,
3069 unsigned int last_offs,
3070 unsigned int blk_per_trk,
3071 unsigned int blksize)
3072 {
3073 struct dasd_ccw_req *cqr;
3074 struct req_iterator iter;
3075 struct bio_vec bv;
3076 char *dst;
3077 unsigned int trkcount, ctidaw;
3078 unsigned char cmd;
3079 struct dasd_device *basedev;
3080 unsigned int tlf;
3081 struct itcw *itcw;
3082 struct tidaw *last_tidaw = NULL;
3083 int itcw_op;
3084 size_t itcw_size;
3085 u8 tidaw_flags;
3086 unsigned int seg_len, part_len, len_to_track_end;
3087 unsigned char new_track;
3088 sector_t recid, trkid;
3089 unsigned int offs;
3090 unsigned int count, count_to_trk_end;
3091 int ret;
3092
3093 basedev = block->base;
3094 if (rq_data_dir(req) == READ) {
3095 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3096 itcw_op = ITCW_OP_READ;
3097 } else if (rq_data_dir(req) == WRITE) {
3098 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3099 itcw_op = ITCW_OP_WRITE;
3100 } else
3101 return ERR_PTR(-EINVAL);
3102
3103 /* trackbased I/O needs address all memory via TIDAWs,
3104 * not just for 64 bit addresses. This allows us to map
3105 * each segment directly to one tidaw.
3106 * In the case of write requests, additional tidaws may
3107 * be needed when a segment crosses a track boundary.
3108 */
3109 trkcount = last_trk - first_trk + 1;
3110 ctidaw = 0;
3111 rq_for_each_segment(bv, req, iter) {
3112 ++ctidaw;
3113 }
3114 if (rq_data_dir(req) == WRITE)
3115 ctidaw += (last_trk - first_trk);
3116
3117 /* Allocate the ccw request. */
3118 itcw_size = itcw_calc_size(0, ctidaw, 0);
3119 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3120 if (IS_ERR(cqr))
3121 return cqr;
3122
3123 /* transfer length factor: how many bytes to read from the last track */
3124 if (first_trk == last_trk)
3125 tlf = last_offs - first_offs + 1;
3126 else
3127 tlf = last_offs + 1;
3128 tlf *= blksize;
3129
3130 itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3131 if (IS_ERR(itcw)) {
3132 ret = -EINVAL;
3133 goto out_error;
3134 }
3135 cqr->cpaddr = itcw_get_tcw(itcw);
3136 if (prepare_itcw(itcw, first_trk, last_trk,
3137 cmd, basedev, startdev,
3138 first_offs + 1,
3139 trkcount, blksize,
3140 (last_rec - first_rec + 1) * blksize,
3141 tlf, blk_per_trk) == -EAGAIN) {
3142 /* Clock not in sync and XRC is enabled.
3143 * Try again later.
3144 */
3145 ret = -EAGAIN;
3146 goto out_error;
3147 }
3148 len_to_track_end = 0;
3149 /*
3150 * A tidaw can address 4k of memory, but must not cross page boundaries
3151 * We can let the block layer handle this by setting
3152 * blk_queue_segment_boundary to page boundaries and
3153 * blk_max_segment_size to page size when setting up the request queue.
3154 * For write requests, a TIDAW must not cross track boundaries, because
3155 * we have to set the CBC flag on the last tidaw for each track.
3156 */
3157 if (rq_data_dir(req) == WRITE) {
3158 new_track = 1;
3159 recid = first_rec;
3160 rq_for_each_segment(bv, req, iter) {
3161 dst = page_address(bv.bv_page) + bv.bv_offset;
3162 seg_len = bv.bv_len;
3163 while (seg_len) {
3164 if (new_track) {
3165 trkid = recid;
3166 offs = sector_div(trkid, blk_per_trk);
3167 count_to_trk_end = blk_per_trk - offs;
3168 count = min((last_rec - recid + 1),
3169 (sector_t)count_to_trk_end);
3170 len_to_track_end = count * blksize;
3171 recid += count;
3172 new_track = 0;
3173 }
3174 part_len = min(seg_len, len_to_track_end);
3175 seg_len -= part_len;
3176 len_to_track_end -= part_len;
3177 /* We need to end the tidaw at track end */
3178 if (!len_to_track_end) {
3179 new_track = 1;
3180 tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3181 } else
3182 tidaw_flags = 0;
3183 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3184 dst, part_len);
3185 if (IS_ERR(last_tidaw)) {
3186 ret = -EINVAL;
3187 goto out_error;
3188 }
3189 dst += part_len;
3190 }
3191 }
3192 } else {
3193 rq_for_each_segment(bv, req, iter) {
3194 dst = page_address(bv.bv_page) + bv.bv_offset;
3195 last_tidaw = itcw_add_tidaw(itcw, 0x00,
3196 dst, bv.bv_len);
3197 if (IS_ERR(last_tidaw)) {
3198 ret = -EINVAL;
3199 goto out_error;
3200 }
3201 }
3202 }
3203 last_tidaw->flags |= TIDAW_FLAGS_LAST;
3204 last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3205 itcw_finalize(itcw);
3206
3207 if (blk_noretry_request(req) ||
3208 block->base->features & DASD_FEATURE_FAILFAST)
3209 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3210 cqr->cpmode = 1;
3211 cqr->startdev = startdev;
3212 cqr->memdev = startdev;
3213 cqr->block = block;
3214 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
3215 cqr->lpm = startdev->path_data.ppm;
3216 cqr->retries = startdev->default_retries;
3217 cqr->buildclk = get_tod_clock();
3218 cqr->status = DASD_CQR_FILLED;
3219 return cqr;
3220 out_error:
3221 dasd_sfree_request(cqr, startdev);
3222 return ERR_PTR(ret);
3223 }
3224
3225 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3226 struct dasd_block *block,
3227 struct request *req)
3228 {
3229 int cmdrtd, cmdwtd;
3230 int use_prefix;
3231 int fcx_multitrack;
3232 struct dasd_eckd_private *private;
3233 struct dasd_device *basedev;
3234 sector_t first_rec, last_rec;
3235 sector_t first_trk, last_trk;
3236 unsigned int first_offs, last_offs;
3237 unsigned int blk_per_trk, blksize;
3238 int cdlspecial;
3239 unsigned int data_size;
3240 struct dasd_ccw_req *cqr;
3241
3242 basedev = block->base;
3243 private = (struct dasd_eckd_private *) basedev->private;
3244
3245 /* Calculate number of blocks/records per track. */
3246 blksize = block->bp_block;
3247 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3248 if (blk_per_trk == 0)
3249 return ERR_PTR(-EINVAL);
3250 /* Calculate record id of first and last block. */
3251 first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3252 first_offs = sector_div(first_trk, blk_per_trk);
3253 last_rec = last_trk =
3254 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3255 last_offs = sector_div(last_trk, blk_per_trk);
3256 cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3257
3258 fcx_multitrack = private->features.feature[40] & 0x20;
3259 data_size = blk_rq_bytes(req);
3260 if (data_size % blksize)
3261 return ERR_PTR(-EINVAL);
3262 /* tpm write request add CBC data on each track boundary */
3263 if (rq_data_dir(req) == WRITE)
3264 data_size += (last_trk - first_trk) * 4;
3265
3266 /* is read track data and write track data in command mode supported? */
3267 cmdrtd = private->features.feature[9] & 0x20;
3268 cmdwtd = private->features.feature[12] & 0x40;
3269 use_prefix = private->features.feature[8] & 0x01;
3270
3271 cqr = NULL;
3272 if (cdlspecial || dasd_page_cache) {
3273 /* do nothing, just fall through to the cmd mode single case */
3274 } else if ((data_size <= private->fcx_max_data)
3275 && (fcx_multitrack || (first_trk == last_trk))) {
3276 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3277 first_rec, last_rec,
3278 first_trk, last_trk,
3279 first_offs, last_offs,
3280 blk_per_trk, blksize);
3281 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3282 (PTR_ERR(cqr) != -ENOMEM))
3283 cqr = NULL;
3284 } else if (use_prefix &&
3285 (((rq_data_dir(req) == READ) && cmdrtd) ||
3286 ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3287 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3288 first_rec, last_rec,
3289 first_trk, last_trk,
3290 first_offs, last_offs,
3291 blk_per_trk, blksize);
3292 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3293 (PTR_ERR(cqr) != -ENOMEM))
3294 cqr = NULL;
3295 }
3296 if (!cqr)
3297 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3298 first_rec, last_rec,
3299 first_trk, last_trk,
3300 first_offs, last_offs,
3301 blk_per_trk, blksize);
3302 return cqr;
3303 }
3304
3305 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3306 struct dasd_block *block,
3307 struct request *req)
3308 {
3309 unsigned long *idaws;
3310 struct dasd_device *basedev;
3311 struct dasd_ccw_req *cqr;
3312 struct ccw1 *ccw;
3313 struct req_iterator iter;
3314 struct bio_vec bv;
3315 char *dst;
3316 unsigned char cmd;
3317 unsigned int trkcount;
3318 unsigned int seg_len, len_to_track_end;
3319 unsigned int first_offs;
3320 unsigned int cidaw, cplength, datasize;
3321 sector_t first_trk, last_trk, sectors;
3322 sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3323 unsigned int pfx_datasize;
3324
3325 /*
3326 * raw track access needs to be mutiple of 64k and on 64k boundary
3327 * For read requests we can fix an incorrect alignment by padding
3328 * the request with dummy pages.
3329 */
3330 start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3331 end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3332 DASD_RAW_SECTORS_PER_TRACK;
3333 end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3334 DASD_RAW_SECTORS_PER_TRACK;
3335 basedev = block->base;
3336 if ((start_padding_sectors || end_padding_sectors) &&
3337 (rq_data_dir(req) == WRITE)) {
3338 DBF_DEV_EVENT(DBF_ERR, basedev,
3339 "raw write not track aligned (%lu,%lu) req %p",
3340 start_padding_sectors, end_padding_sectors, req);
3341 cqr = ERR_PTR(-EINVAL);
3342 goto out;
3343 }
3344
3345 first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3346 last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3347 DASD_RAW_SECTORS_PER_TRACK;
3348 trkcount = last_trk - first_trk + 1;
3349 first_offs = 0;
3350
3351 if (rq_data_dir(req) == READ)
3352 cmd = DASD_ECKD_CCW_READ_TRACK;
3353 else if (rq_data_dir(req) == WRITE)
3354 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3355 else {
3356 cqr = ERR_PTR(-EINVAL);
3357 goto out;
3358 }
3359
3360 /*
3361 * Raw track based I/O needs IDAWs for each page,
3362 * and not just for 64 bit addresses.
3363 */
3364 cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3365
3366 /* 1x prefix + one read/write ccw per track */
3367 cplength = 1 + trkcount;
3368
3369 /*
3370 * struct PFX_eckd_data has up to 2 byte as extended parameter
3371 * this is needed for write full track and has to be mentioned
3372 * separately
3373 * add 8 instead of 2 to keep 8 byte boundary
3374 */
3375 pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3376
3377 datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3378
3379 /* Allocate the ccw request. */
3380 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3381 datasize, startdev);
3382 if (IS_ERR(cqr))
3383 goto out;
3384 ccw = cqr->cpaddr;
3385
3386 if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3387 basedev, startdev, 1 /* format */, first_offs + 1,
3388 trkcount, 0, 0) == -EAGAIN) {
3389 /* Clock not in sync and XRC is enabled.
3390 * Try again later.
3391 */
3392 dasd_sfree_request(cqr, startdev);
3393 cqr = ERR_PTR(-EAGAIN);
3394 goto out;
3395 }
3396
3397 idaws = (unsigned long *)(cqr->data + pfx_datasize);
3398 len_to_track_end = 0;
3399 if (start_padding_sectors) {
3400 ccw[-1].flags |= CCW_FLAG_CC;
3401 ccw->cmd_code = cmd;
3402 /* maximum 3390 track size */
3403 ccw->count = 57326;
3404 /* 64k map to one track */
3405 len_to_track_end = 65536 - start_padding_sectors * 512;
3406 ccw->cda = (__u32)(addr_t)idaws;
3407 ccw->flags |= CCW_FLAG_IDA;
3408 ccw->flags |= CCW_FLAG_SLI;
3409 ccw++;
3410 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3411 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3412 }
3413 rq_for_each_segment(bv, req, iter) {
3414 dst = page_address(bv.bv_page) + bv.bv_offset;
3415 seg_len = bv.bv_len;
3416 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3417 memset(dst, 0, seg_len);
3418 if (!len_to_track_end) {
3419 ccw[-1].flags |= CCW_FLAG_CC;
3420 ccw->cmd_code = cmd;
3421 /* maximum 3390 track size */
3422 ccw->count = 57326;
3423 /* 64k map to one track */
3424 len_to_track_end = 65536;
3425 ccw->cda = (__u32)(addr_t)idaws;
3426 ccw->flags |= CCW_FLAG_IDA;
3427 ccw->flags |= CCW_FLAG_SLI;
3428 ccw++;
3429 }
3430 len_to_track_end -= seg_len;
3431 idaws = idal_create_words(idaws, dst, seg_len);
3432 }
3433 for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3434 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3435 if (blk_noretry_request(req) ||
3436 block->base->features & DASD_FEATURE_FAILFAST)
3437 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3438 cqr->startdev = startdev;
3439 cqr->memdev = startdev;
3440 cqr->block = block;
3441 cqr->expires = startdev->default_expires * HZ;
3442 cqr->lpm = startdev->path_data.ppm;
3443 cqr->retries = startdev->default_retries;
3444 cqr->buildclk = get_tod_clock();
3445 cqr->status = DASD_CQR_FILLED;
3446
3447 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3448 cqr = NULL;
3449 out:
3450 return cqr;
3451 }
3452
3453
3454 static int
3455 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3456 {
3457 struct dasd_eckd_private *private;
3458 struct ccw1 *ccw;
3459 struct req_iterator iter;
3460 struct bio_vec bv;
3461 char *dst, *cda;
3462 unsigned int blksize, blk_per_trk, off;
3463 sector_t recid;
3464 int status;
3465
3466 if (!dasd_page_cache)
3467 goto out;
3468 private = (struct dasd_eckd_private *) cqr->block->base->private;
3469 blksize = cqr->block->bp_block;
3470 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3471 recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3472 ccw = cqr->cpaddr;
3473 /* Skip over define extent & locate record. */
3474 ccw++;
3475 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3476 ccw++;
3477 rq_for_each_segment(bv, req, iter) {
3478 dst = page_address(bv.bv_page) + bv.bv_offset;
3479 for (off = 0; off < bv.bv_len; off += blksize) {
3480 /* Skip locate record. */
3481 if (private->uses_cdl && recid <= 2*blk_per_trk)
3482 ccw++;
3483 if (dst) {
3484 if (ccw->flags & CCW_FLAG_IDA)
3485 cda = *((char **)((addr_t) ccw->cda));
3486 else
3487 cda = (char *)((addr_t) ccw->cda);
3488 if (dst != cda) {
3489 if (rq_data_dir(req) == READ)
3490 memcpy(dst, cda, bv.bv_len);
3491 kmem_cache_free(dasd_page_cache,
3492 (void *)((addr_t)cda & PAGE_MASK));
3493 }
3494 dst = NULL;
3495 }
3496 ccw++;
3497 recid++;
3498 }
3499 }
3500 out:
3501 status = cqr->status == DASD_CQR_DONE;
3502 dasd_sfree_request(cqr, cqr->memdev);
3503 return status;
3504 }
3505
3506 /*
3507 * Modify ccw/tcw in cqr so it can be started on a base device.
3508 *
3509 * Note that this is not enough to restart the cqr!
3510 * Either reset cqr->startdev as well (summary unit check handling)
3511 * or restart via separate cqr (as in ERP handling).
3512 */
3513 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3514 {
3515 struct ccw1 *ccw;
3516 struct PFX_eckd_data *pfxdata;
3517 struct tcw *tcw;
3518 struct tccb *tccb;
3519 struct dcw *dcw;
3520
3521 if (cqr->cpmode == 1) {
3522 tcw = cqr->cpaddr;
3523 tccb = tcw_get_tccb(tcw);
3524 dcw = (struct dcw *)&tccb->tca[0];
3525 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3526 pfxdata->validity.verify_base = 0;
3527 pfxdata->validity.hyper_pav = 0;
3528 } else {
3529 ccw = cqr->cpaddr;
3530 pfxdata = cqr->data;
3531 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3532 pfxdata->validity.verify_base = 0;
3533 pfxdata->validity.hyper_pav = 0;
3534 }
3535 }
3536 }
3537
3538 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3539
3540 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3541 struct dasd_block *block,
3542 struct request *req)
3543 {
3544 struct dasd_eckd_private *private;
3545 struct dasd_device *startdev;
3546 unsigned long flags;
3547 struct dasd_ccw_req *cqr;
3548
3549 startdev = dasd_alias_get_start_dev(base);
3550 if (!startdev)
3551 startdev = base;
3552 private = (struct dasd_eckd_private *) startdev->private;
3553 if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3554 return ERR_PTR(-EBUSY);
3555
3556 spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3557 private->count++;
3558 if ((base->features & DASD_FEATURE_USERAW))
3559 cqr = dasd_raw_build_cp(startdev, block, req);
3560 else
3561 cqr = dasd_eckd_build_cp(startdev, block, req);
3562 if (IS_ERR(cqr))
3563 private->count--;
3564 spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3565 return cqr;
3566 }
3567
3568 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3569 struct request *req)
3570 {
3571 struct dasd_eckd_private *private;
3572 unsigned long flags;
3573
3574 spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3575 private = (struct dasd_eckd_private *) cqr->memdev->private;
3576 private->count--;
3577 spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3578 return dasd_eckd_free_cp(cqr, req);
3579 }
3580
3581 static int
3582 dasd_eckd_fill_info(struct dasd_device * device,
3583 struct dasd_information2_t * info)
3584 {
3585 struct dasd_eckd_private *private;
3586
3587 private = (struct dasd_eckd_private *) device->private;
3588 info->label_block = 2;
3589 info->FBA_layout = private->uses_cdl ? 0 : 1;
3590 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3591 info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3592 memcpy(info->characteristics, &private->rdc_data,
3593 sizeof(struct dasd_eckd_characteristics));
3594 info->confdata_size = min((unsigned long)private->conf_len,
3595 sizeof(info->configuration_data));
3596 memcpy(info->configuration_data, private->conf_data,
3597 info->confdata_size);
3598 return 0;
3599 }
3600
3601 /*
3602 * SECTION: ioctl functions for eckd devices.
3603 */
3604
3605 /*
3606 * Release device ioctl.
3607 * Buils a channel programm to releases a prior reserved
3608 * (see dasd_eckd_reserve) device.
3609 */
3610 static int
3611 dasd_eckd_release(struct dasd_device *device)
3612 {
3613 struct dasd_ccw_req *cqr;
3614 int rc;
3615 struct ccw1 *ccw;
3616 int useglobal;
3617
3618 if (!capable(CAP_SYS_ADMIN))
3619 return -EACCES;
3620
3621 useglobal = 0;
3622 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3623 if (IS_ERR(cqr)) {
3624 mutex_lock(&dasd_reserve_mutex);
3625 useglobal = 1;
3626 cqr = &dasd_reserve_req->cqr;
3627 memset(cqr, 0, sizeof(*cqr));
3628 memset(&dasd_reserve_req->ccw, 0,
3629 sizeof(dasd_reserve_req->ccw));
3630 cqr->cpaddr = &dasd_reserve_req->ccw;
3631 cqr->data = &dasd_reserve_req->data;
3632 cqr->magic = DASD_ECKD_MAGIC;
3633 }
3634 ccw = cqr->cpaddr;
3635 ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3636 ccw->flags |= CCW_FLAG_SLI;
3637 ccw->count = 32;
3638 ccw->cda = (__u32)(addr_t) cqr->data;
3639 cqr->startdev = device;
3640 cqr->memdev = device;
3641 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3642 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3643 cqr->retries = 2; /* set retry counter to enable basic ERP */
3644 cqr->expires = 2 * HZ;
3645 cqr->buildclk = get_tod_clock();
3646 cqr->status = DASD_CQR_FILLED;
3647
3648 rc = dasd_sleep_on_immediatly(cqr);
3649 if (!rc)
3650 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3651
3652 if (useglobal)
3653 mutex_unlock(&dasd_reserve_mutex);
3654 else
3655 dasd_sfree_request(cqr, cqr->memdev);
3656 return rc;
3657 }
3658
3659 /*
3660 * Reserve device ioctl.
3661 * Options are set to 'synchronous wait for interrupt' and
3662 * 'timeout the request'. This leads to a terminate IO if
3663 * the interrupt is outstanding for a certain time.
3664 */
3665 static int
3666 dasd_eckd_reserve(struct dasd_device *device)
3667 {
3668 struct dasd_ccw_req *cqr;
3669 int rc;
3670 struct ccw1 *ccw;
3671 int useglobal;
3672
3673 if (!capable(CAP_SYS_ADMIN))
3674 return -EACCES;
3675
3676 useglobal = 0;
3677 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3678 if (IS_ERR(cqr)) {
3679 mutex_lock(&dasd_reserve_mutex);
3680 useglobal = 1;
3681 cqr = &dasd_reserve_req->cqr;
3682 memset(cqr, 0, sizeof(*cqr));
3683 memset(&dasd_reserve_req->ccw, 0,
3684 sizeof(dasd_reserve_req->ccw));
3685 cqr->cpaddr = &dasd_reserve_req->ccw;
3686 cqr->data = &dasd_reserve_req->data;
3687 cqr->magic = DASD_ECKD_MAGIC;
3688 }
3689 ccw = cqr->cpaddr;
3690 ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3691 ccw->flags |= CCW_FLAG_SLI;
3692 ccw->count = 32;
3693 ccw->cda = (__u32)(addr_t) cqr->data;
3694 cqr->startdev = device;
3695 cqr->memdev = device;
3696 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3697 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3698 cqr->retries = 2; /* set retry counter to enable basic ERP */
3699 cqr->expires = 2 * HZ;
3700 cqr->buildclk = get_tod_clock();
3701 cqr->status = DASD_CQR_FILLED;
3702
3703 rc = dasd_sleep_on_immediatly(cqr);
3704 if (!rc)
3705 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3706
3707 if (useglobal)
3708 mutex_unlock(&dasd_reserve_mutex);
3709 else
3710 dasd_sfree_request(cqr, cqr->memdev);
3711 return rc;
3712 }
3713
3714 /*
3715 * Steal lock ioctl - unconditional reserve device.
3716 * Buils a channel programm to break a device's reservation.
3717 * (unconditional reserve)
3718 */
3719 static int
3720 dasd_eckd_steal_lock(struct dasd_device *device)
3721 {
3722 struct dasd_ccw_req *cqr;
3723 int rc;
3724 struct ccw1 *ccw;
3725 int useglobal;
3726
3727 if (!capable(CAP_SYS_ADMIN))
3728 return -EACCES;
3729
3730 useglobal = 0;
3731 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3732 if (IS_ERR(cqr)) {
3733 mutex_lock(&dasd_reserve_mutex);
3734 useglobal = 1;
3735 cqr = &dasd_reserve_req->cqr;
3736 memset(cqr, 0, sizeof(*cqr));
3737 memset(&dasd_reserve_req->ccw, 0,
3738 sizeof(dasd_reserve_req->ccw));
3739 cqr->cpaddr = &dasd_reserve_req->ccw;
3740 cqr->data = &dasd_reserve_req->data;
3741 cqr->magic = DASD_ECKD_MAGIC;
3742 }
3743 ccw = cqr->cpaddr;
3744 ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3745 ccw->flags |= CCW_FLAG_SLI;
3746 ccw->count = 32;
3747 ccw->cda = (__u32)(addr_t) cqr->data;
3748 cqr->startdev = device;
3749 cqr->memdev = device;
3750 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3751 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3752 cqr->retries = 2; /* set retry counter to enable basic ERP */
3753 cqr->expires = 2 * HZ;
3754 cqr->buildclk = get_tod_clock();
3755 cqr->status = DASD_CQR_FILLED;
3756
3757 rc = dasd_sleep_on_immediatly(cqr);
3758 if (!rc)
3759 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3760
3761 if (useglobal)
3762 mutex_unlock(&dasd_reserve_mutex);
3763 else
3764 dasd_sfree_request(cqr, cqr->memdev);
3765 return rc;
3766 }
3767
3768 /*
3769 * SNID - Sense Path Group ID
3770 * This ioctl may be used in situations where I/O is stalled due to
3771 * a reserve, so if the normal dasd_smalloc_request fails, we use the
3772 * preallocated dasd_reserve_req.
3773 */
3774 static int dasd_eckd_snid(struct dasd_device *device,
3775 void __user *argp)
3776 {
3777 struct dasd_ccw_req *cqr;
3778 int rc;
3779 struct ccw1 *ccw;
3780 int useglobal;
3781 struct dasd_snid_ioctl_data usrparm;
3782
3783 if (!capable(CAP_SYS_ADMIN))
3784 return -EACCES;
3785
3786 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3787 return -EFAULT;
3788
3789 useglobal = 0;
3790 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3791 sizeof(struct dasd_snid_data), device);
3792 if (IS_ERR(cqr)) {
3793 mutex_lock(&dasd_reserve_mutex);
3794 useglobal = 1;
3795 cqr = &dasd_reserve_req->cqr;
3796 memset(cqr, 0, sizeof(*cqr));
3797 memset(&dasd_reserve_req->ccw, 0,
3798 sizeof(dasd_reserve_req->ccw));
3799 cqr->cpaddr = &dasd_reserve_req->ccw;
3800 cqr->data = &dasd_reserve_req->data;
3801 cqr->magic = DASD_ECKD_MAGIC;
3802 }
3803 ccw = cqr->cpaddr;
3804 ccw->cmd_code = DASD_ECKD_CCW_SNID;
3805 ccw->flags |= CCW_FLAG_SLI;
3806 ccw->count = 12;
3807 ccw->cda = (__u32)(addr_t) cqr->data;
3808 cqr->startdev = device;
3809 cqr->memdev = device;
3810 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3811 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3812 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3813 cqr->retries = 5;
3814 cqr->expires = 10 * HZ;
3815 cqr->buildclk = get_tod_clock();
3816 cqr->status = DASD_CQR_FILLED;
3817 cqr->lpm = usrparm.path_mask;
3818
3819 rc = dasd_sleep_on_immediatly(cqr);
3820 /* verify that I/O processing didn't modify the path mask */
3821 if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3822 rc = -EIO;
3823 if (!rc) {
3824 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3825 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3826 rc = -EFAULT;
3827 }
3828
3829 if (useglobal)
3830 mutex_unlock(&dasd_reserve_mutex);
3831 else
3832 dasd_sfree_request(cqr, cqr->memdev);
3833 return rc;
3834 }
3835
3836 /*
3837 * Read performance statistics
3838 */
3839 static int
3840 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3841 {
3842 struct dasd_psf_prssd_data *prssdp;
3843 struct dasd_rssd_perf_stats_t *stats;
3844 struct dasd_ccw_req *cqr;
3845 struct ccw1 *ccw;
3846 int rc;
3847
3848 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
3849 (sizeof(struct dasd_psf_prssd_data) +
3850 sizeof(struct dasd_rssd_perf_stats_t)),
3851 device);
3852 if (IS_ERR(cqr)) {
3853 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3854 "Could not allocate initialization request");
3855 return PTR_ERR(cqr);
3856 }
3857 cqr->startdev = device;
3858 cqr->memdev = device;
3859 cqr->retries = 0;
3860 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3861 cqr->expires = 10 * HZ;
3862
3863 /* Prepare for Read Subsystem Data */
3864 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3865 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3866 prssdp->order = PSF_ORDER_PRSSD;
3867 prssdp->suborder = 0x01; /* Performance Statistics */
3868 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
3869
3870 ccw = cqr->cpaddr;
3871 ccw->cmd_code = DASD_ECKD_CCW_PSF;
3872 ccw->count = sizeof(struct dasd_psf_prssd_data);
3873 ccw->flags |= CCW_FLAG_CC;
3874 ccw->cda = (__u32)(addr_t) prssdp;
3875
3876 /* Read Subsystem Data - Performance Statistics */
3877 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3878 memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3879
3880 ccw++;
3881 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3882 ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3883 ccw->cda = (__u32)(addr_t) stats;
3884
3885 cqr->buildclk = get_tod_clock();
3886 cqr->status = DASD_CQR_FILLED;
3887 rc = dasd_sleep_on(cqr);
3888 if (rc == 0) {
3889 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3890 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3891 if (copy_to_user(argp, stats,
3892 sizeof(struct dasd_rssd_perf_stats_t)))
3893 rc = -EFAULT;
3894 }
3895 dasd_sfree_request(cqr, cqr->memdev);
3896 return rc;
3897 }
3898
3899 /*
3900 * Get attributes (cache operations)
3901 * Returnes the cache attributes used in Define Extend (DE).
3902 */
3903 static int
3904 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3905 {
3906 struct dasd_eckd_private *private =
3907 (struct dasd_eckd_private *)device->private;
3908 struct attrib_data_t attrib = private->attrib;
3909 int rc;
3910
3911 if (!capable(CAP_SYS_ADMIN))
3912 return -EACCES;
3913 if (!argp)
3914 return -EINVAL;
3915
3916 rc = 0;
3917 if (copy_to_user(argp, (long *) &attrib,
3918 sizeof(struct attrib_data_t)))
3919 rc = -EFAULT;
3920
3921 return rc;
3922 }
3923
3924 /*
3925 * Set attributes (cache operations)
3926 * Stores the attributes for cache operation to be used in Define Extend (DE).
3927 */
3928 static int
3929 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3930 {
3931 struct dasd_eckd_private *private =
3932 (struct dasd_eckd_private *)device->private;
3933 struct attrib_data_t attrib;
3934
3935 if (!capable(CAP_SYS_ADMIN))
3936 return -EACCES;
3937 if (!argp)
3938 return -EINVAL;
3939
3940 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3941 return -EFAULT;
3942 private->attrib = attrib;
3943
3944 dev_info(&device->cdev->dev,
3945 "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3946 private->attrib.operation, private->attrib.nr_cyl);
3947 return 0;
3948 }
3949
3950 /*
3951 * Issue syscall I/O to EMC Symmetrix array.
3952 * CCWs are PSF and RSSD
3953 */
3954 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3955 {
3956 struct dasd_symmio_parms usrparm;
3957 char *psf_data, *rssd_result;
3958 struct dasd_ccw_req *cqr;
3959 struct ccw1 *ccw;
3960 char psf0, psf1;
3961 int rc;
3962
3963 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3964 return -EACCES;
3965 psf0 = psf1 = 0;
3966
3967 /* Copy parms from caller */
3968 rc = -EFAULT;
3969 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3970 goto out;
3971 if (is_compat_task() || sizeof(long) == 4) {
3972 /* Make sure pointers are sane even on 31 bit. */
3973 rc = -EINVAL;
3974 if ((usrparm.psf_data >> 32) != 0)
3975 goto out;
3976 if ((usrparm.rssd_result >> 32) != 0)
3977 goto out;
3978 usrparm.psf_data &= 0x7fffffffULL;
3979 usrparm.rssd_result &= 0x7fffffffULL;
3980 }
3981 /* alloc I/O data area */
3982 psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3983 rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3984 if (!psf_data || !rssd_result) {
3985 rc = -ENOMEM;
3986 goto out_free;
3987 }
3988
3989 /* get syscall header from user space */
3990 rc = -EFAULT;
3991 if (copy_from_user(psf_data,
3992 (void __user *)(unsigned long) usrparm.psf_data,
3993 usrparm.psf_data_len))
3994 goto out_free;
3995 psf0 = psf_data[0];
3996 psf1 = psf_data[1];
3997
3998 /* setup CCWs for PSF + RSSD */
3999 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
4000 if (IS_ERR(cqr)) {
4001 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4002 "Could not allocate initialization request");
4003 rc = PTR_ERR(cqr);
4004 goto out_free;
4005 }
4006
4007 cqr->startdev = device;
4008 cqr->memdev = device;
4009 cqr->retries = 3;
4010 cqr->expires = 10 * HZ;
4011 cqr->buildclk = get_tod_clock();
4012 cqr->status = DASD_CQR_FILLED;
4013
4014 /* Build the ccws */
4015 ccw = cqr->cpaddr;
4016
4017 /* PSF ccw */
4018 ccw->cmd_code = DASD_ECKD_CCW_PSF;
4019 ccw->count = usrparm.psf_data_len;
4020 ccw->flags |= CCW_FLAG_CC;
4021 ccw->cda = (__u32)(addr_t) psf_data;
4022
4023 ccw++;
4024
4025 /* RSSD ccw */
4026 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4027 ccw->count = usrparm.rssd_result_len;
4028 ccw->flags = CCW_FLAG_SLI ;
4029 ccw->cda = (__u32)(addr_t) rssd_result;
4030
4031 rc = dasd_sleep_on(cqr);
4032 if (rc)
4033 goto out_sfree;
4034
4035 rc = -EFAULT;
4036 if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4037 rssd_result, usrparm.rssd_result_len))
4038 goto out_sfree;
4039 rc = 0;
4040
4041 out_sfree:
4042 dasd_sfree_request(cqr, cqr->memdev);
4043 out_free:
4044 kfree(rssd_result);
4045 kfree(psf_data);
4046 out:
4047 DBF_DEV_EVENT(DBF_WARNING, device,
4048 "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4049 (int) psf0, (int) psf1, rc);
4050 return rc;
4051 }
4052
4053 static int
4054 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4055 {
4056 struct dasd_device *device = block->base;
4057
4058 switch (cmd) {
4059 case BIODASDGATTR:
4060 return dasd_eckd_get_attrib(device, argp);
4061 case BIODASDSATTR:
4062 return dasd_eckd_set_attrib(device, argp);
4063 case BIODASDPSRD:
4064 return dasd_eckd_performance(device, argp);
4065 case BIODASDRLSE:
4066 return dasd_eckd_release(device);
4067 case BIODASDRSRV:
4068 return dasd_eckd_reserve(device);
4069 case BIODASDSLCK:
4070 return dasd_eckd_steal_lock(device);
4071 case BIODASDSNID:
4072 return dasd_eckd_snid(device, argp);
4073 case BIODASDSYMMIO:
4074 return dasd_symm_io(device, argp);
4075 default:
4076 return -ENOTTY;
4077 }
4078 }
4079
4080 /*
4081 * Dump the range of CCWs into 'page' buffer
4082 * and return number of printed chars.
4083 */
4084 static int
4085 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4086 {
4087 int len, count;
4088 char *datap;
4089
4090 len = 0;
4091 while (from <= to) {
4092 len += sprintf(page + len, PRINTK_HEADER
4093 " CCW %p: %08X %08X DAT:",
4094 from, ((int *) from)[0], ((int *) from)[1]);
4095
4096 /* get pointer to data (consider IDALs) */
4097 if (from->flags & CCW_FLAG_IDA)
4098 datap = (char *) *((addr_t *) (addr_t) from->cda);
4099 else
4100 datap = (char *) ((addr_t) from->cda);
4101
4102 /* dump data (max 32 bytes) */
4103 for (count = 0; count < from->count && count < 32; count++) {
4104 if (count % 8 == 0) len += sprintf(page + len, " ");
4105 if (count % 4 == 0) len += sprintf(page + len, " ");
4106 len += sprintf(page + len, "%02x", datap[count]);
4107 }
4108 len += sprintf(page + len, "\n");
4109 from++;
4110 }
4111 return len;
4112 }
4113
4114 static void
4115 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4116 char *reason)
4117 {
4118 u64 *sense;
4119 u64 *stat;
4120
4121 sense = (u64 *) dasd_get_sense(irb);
4122 stat = (u64 *) &irb->scsw;
4123 if (sense) {
4124 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4125 "%016llx %016llx %016llx %016llx",
4126 reason, *stat, *((u32 *) (stat + 1)),
4127 sense[0], sense[1], sense[2], sense[3]);
4128 } else {
4129 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4130 reason, *stat, *((u32 *) (stat + 1)),
4131 "NO VALID SENSE");
4132 }
4133 }
4134
4135 /*
4136 * Print sense data and related channel program.
4137 * Parts are printed because printk buffer is only 1024 bytes.
4138 */
4139 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4140 struct dasd_ccw_req *req, struct irb *irb)
4141 {
4142 char *page;
4143 struct ccw1 *first, *last, *fail, *from, *to;
4144 int len, sl, sct;
4145
4146 page = (char *) get_zeroed_page(GFP_ATOMIC);
4147 if (page == NULL) {
4148 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4149 "No memory to dump sense data\n");
4150 return;
4151 }
4152 /* dump the sense data */
4153 len = sprintf(page, PRINTK_HEADER
4154 " I/O status report for device %s:\n",
4155 dev_name(&device->cdev->dev));
4156 len += sprintf(page + len, PRINTK_HEADER
4157 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4158 "CS:%02X RC:%d\n",
4159 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4160 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4161 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4162 req ? req->intrc : 0);
4163 len += sprintf(page + len, PRINTK_HEADER
4164 " device %s: Failing CCW: %p\n",
4165 dev_name(&device->cdev->dev),
4166 (void *) (addr_t) irb->scsw.cmd.cpa);
4167 if (irb->esw.esw0.erw.cons) {
4168 for (sl = 0; sl < 4; sl++) {
4169 len += sprintf(page + len, PRINTK_HEADER
4170 " Sense(hex) %2d-%2d:",
4171 (8 * sl), ((8 * sl) + 7));
4172
4173 for (sct = 0; sct < 8; sct++) {
4174 len += sprintf(page + len, " %02x",
4175 irb->ecw[8 * sl + sct]);
4176 }
4177 len += sprintf(page + len, "\n");
4178 }
4179
4180 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4181 /* 24 Byte Sense Data */
4182 sprintf(page + len, PRINTK_HEADER
4183 " 24 Byte: %x MSG %x, "
4184 "%s MSGb to SYSOP\n",
4185 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4186 irb->ecw[1] & 0x10 ? "" : "no");
4187 } else {
4188 /* 32 Byte Sense Data */
4189 sprintf(page + len, PRINTK_HEADER
4190 " 32 Byte: Format: %x "
4191 "Exception class %x\n",
4192 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4193 }
4194 } else {
4195 sprintf(page + len, PRINTK_HEADER
4196 " SORRY - NO VALID SENSE AVAILABLE\n");
4197 }
4198 printk(KERN_ERR "%s", page);
4199
4200 if (req) {
4201 /* req == NULL for unsolicited interrupts */
4202 /* dump the Channel Program (max 140 Bytes per line) */
4203 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4204 first = req->cpaddr;
4205 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4206 to = min(first + 6, last);
4207 len = sprintf(page, PRINTK_HEADER
4208 " Related CP in req: %p\n", req);
4209 dasd_eckd_dump_ccw_range(first, to, page + len);
4210 printk(KERN_ERR "%s", page);
4211
4212 /* print failing CCW area (maximum 4) */
4213 /* scsw->cda is either valid or zero */
4214 len = 0;
4215 from = ++to;
4216 fail = (struct ccw1 *)(addr_t)
4217 irb->scsw.cmd.cpa; /* failing CCW */
4218 if (from < fail - 2) {
4219 from = fail - 2; /* there is a gap - print header */
4220 len += sprintf(page, PRINTK_HEADER "......\n");
4221 }
4222 to = min(fail + 1, last);
4223 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4224
4225 /* print last CCWs (maximum 2) */
4226 from = max(from, ++to);
4227 if (from < last - 1) {
4228 from = last - 1; /* there is a gap - print header */
4229 len += sprintf(page + len, PRINTK_HEADER "......\n");
4230 }
4231 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4232 if (len > 0)
4233 printk(KERN_ERR "%s", page);
4234 }
4235 free_page((unsigned long) page);
4236 }
4237
4238
4239 /*
4240 * Print sense data from a tcw.
4241 */
4242 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4243 struct dasd_ccw_req *req, struct irb *irb)
4244 {
4245 char *page;
4246 int len, sl, sct, residual;
4247 struct tsb *tsb;
4248 u8 *sense, *rcq;
4249
4250 page = (char *) get_zeroed_page(GFP_ATOMIC);
4251 if (page == NULL) {
4252 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4253 "No memory to dump sense data");
4254 return;
4255 }
4256 /* dump the sense data */
4257 len = sprintf(page, PRINTK_HEADER
4258 " I/O status report for device %s:\n",
4259 dev_name(&device->cdev->dev));
4260 len += sprintf(page + len, PRINTK_HEADER
4261 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4262 "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4263 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4264 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4265 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4266 irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4267 req ? req->intrc : 0);
4268 len += sprintf(page + len, PRINTK_HEADER
4269 " device %s: Failing TCW: %p\n",
4270 dev_name(&device->cdev->dev),
4271 (void *) (addr_t) irb->scsw.tm.tcw);
4272
4273 tsb = NULL;
4274 sense = NULL;
4275 if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4276 tsb = tcw_get_tsb(
4277 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4278
4279 if (tsb) {
4280 len += sprintf(page + len, PRINTK_HEADER
4281 " tsb->length %d\n", tsb->length);
4282 len += sprintf(page + len, PRINTK_HEADER
4283 " tsb->flags %x\n", tsb->flags);
4284 len += sprintf(page + len, PRINTK_HEADER
4285 " tsb->dcw_offset %d\n", tsb->dcw_offset);
4286 len += sprintf(page + len, PRINTK_HEADER
4287 " tsb->count %d\n", tsb->count);
4288 residual = tsb->count - 28;
4289 len += sprintf(page + len, PRINTK_HEADER
4290 " residual %d\n", residual);
4291
4292 switch (tsb->flags & 0x07) {
4293 case 1: /* tsa_iostat */
4294 len += sprintf(page + len, PRINTK_HEADER
4295 " tsb->tsa.iostat.dev_time %d\n",
4296 tsb->tsa.iostat.dev_time);
4297 len += sprintf(page + len, PRINTK_HEADER
4298 " tsb->tsa.iostat.def_time %d\n",
4299 tsb->tsa.iostat.def_time);
4300 len += sprintf(page + len, PRINTK_HEADER
4301 " tsb->tsa.iostat.queue_time %d\n",
4302 tsb->tsa.iostat.queue_time);
4303 len += sprintf(page + len, PRINTK_HEADER
4304 " tsb->tsa.iostat.dev_busy_time %d\n",
4305 tsb->tsa.iostat.dev_busy_time);
4306 len += sprintf(page + len, PRINTK_HEADER
4307 " tsb->tsa.iostat.dev_act_time %d\n",
4308 tsb->tsa.iostat.dev_act_time);
4309 sense = tsb->tsa.iostat.sense;
4310 break;
4311 case 2: /* ts_ddpc */
4312 len += sprintf(page + len, PRINTK_HEADER
4313 " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4314 for (sl = 0; sl < 2; sl++) {
4315 len += sprintf(page + len, PRINTK_HEADER
4316 " tsb->tsa.ddpc.rcq %2d-%2d: ",
4317 (8 * sl), ((8 * sl) + 7));
4318 rcq = tsb->tsa.ddpc.rcq;
4319 for (sct = 0; sct < 8; sct++) {
4320 len += sprintf(page + len, " %02x",
4321 rcq[8 * sl + sct]);
4322 }
4323 len += sprintf(page + len, "\n");
4324 }
4325 sense = tsb->tsa.ddpc.sense;
4326 break;
4327 case 3: /* tsa_intrg */
4328 len += sprintf(page + len, PRINTK_HEADER
4329 " tsb->tsa.intrg.: not supportet yet\n");
4330 break;
4331 }
4332
4333 if (sense) {
4334 for (sl = 0; sl < 4; sl++) {
4335 len += sprintf(page + len, PRINTK_HEADER
4336 " Sense(hex) %2d-%2d:",
4337 (8 * sl), ((8 * sl) + 7));
4338 for (sct = 0; sct < 8; sct++) {
4339 len += sprintf(page + len, " %02x",
4340 sense[8 * sl + sct]);
4341 }
4342 len += sprintf(page + len, "\n");
4343 }
4344
4345 if (sense[27] & DASD_SENSE_BIT_0) {
4346 /* 24 Byte Sense Data */
4347 sprintf(page + len, PRINTK_HEADER
4348 " 24 Byte: %x MSG %x, "
4349 "%s MSGb to SYSOP\n",
4350 sense[7] >> 4, sense[7] & 0x0f,
4351 sense[1] & 0x10 ? "" : "no");
4352 } else {
4353 /* 32 Byte Sense Data */
4354 sprintf(page + len, PRINTK_HEADER
4355 " 32 Byte: Format: %x "
4356 "Exception class %x\n",
4357 sense[6] & 0x0f, sense[22] >> 4);
4358 }
4359 } else {
4360 sprintf(page + len, PRINTK_HEADER
4361 " SORRY - NO VALID SENSE AVAILABLE\n");
4362 }
4363 } else {
4364 sprintf(page + len, PRINTK_HEADER
4365 " SORRY - NO TSB DATA AVAILABLE\n");
4366 }
4367 printk(KERN_ERR "%s", page);
4368 free_page((unsigned long) page);
4369 }
4370
4371 static void dasd_eckd_dump_sense(struct dasd_device *device,
4372 struct dasd_ccw_req *req, struct irb *irb)
4373 {
4374 if (scsw_is_tm(&irb->scsw))
4375 dasd_eckd_dump_sense_tcw(device, req, irb);
4376 else
4377 dasd_eckd_dump_sense_ccw(device, req, irb);
4378 }
4379
4380 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4381 {
4382 /*
4383 * the device should be disconnected from our LCU structure
4384 * on restore we will reconnect it and reread LCU specific
4385 * information like PAV support that might have changed
4386 */
4387 dasd_alias_remove_device(device);
4388 dasd_alias_disconnect_device_from_lcu(device);
4389
4390 return 0;
4391 }
4392
4393 static int dasd_eckd_restore_device(struct dasd_device *device)
4394 {
4395 struct dasd_eckd_private *private;
4396 struct dasd_eckd_characteristics temp_rdc_data;
4397 int rc;
4398 struct dasd_uid temp_uid;
4399 unsigned long flags;
4400 unsigned long cqr_flags = 0;
4401
4402 private = (struct dasd_eckd_private *) device->private;
4403
4404 /* Read Configuration Data */
4405 dasd_eckd_read_conf(device);
4406
4407 dasd_eckd_get_uid(device, &temp_uid);
4408 /* Generate device unique id */
4409 rc = dasd_eckd_generate_uid(device);
4410 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4411 if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4412 dev_err(&device->cdev->dev, "The UID of the DASD has "
4413 "changed\n");
4414 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4415 if (rc)
4416 goto out_err;
4417
4418 /* register lcu with alias handling, enable PAV if this is a new lcu */
4419 rc = dasd_alias_make_device_known_to_lcu(device);
4420 if (rc)
4421 return rc;
4422
4423 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4424 dasd_eckd_validate_server(device, cqr_flags);
4425
4426 /* RE-Read Configuration Data */
4427 dasd_eckd_read_conf(device);
4428
4429 /* Read Feature Codes */
4430 dasd_eckd_read_features(device);
4431
4432 /* Read Device Characteristics */
4433 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4434 &temp_rdc_data, 64);
4435 if (rc) {
4436 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4437 "Read device characteristic failed, rc=%d", rc);
4438 goto out_err;
4439 }
4440 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4441 memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4442 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4443
4444 /* add device to alias management */
4445 dasd_alias_add_device(device);
4446
4447 return 0;
4448
4449 out_err:
4450 return -1;
4451 }
4452
4453 static int dasd_eckd_reload_device(struct dasd_device *device)
4454 {
4455 struct dasd_eckd_private *private;
4456 int rc, old_base;
4457 char print_uid[60];
4458 struct dasd_uid uid;
4459 unsigned long flags;
4460
4461 private = (struct dasd_eckd_private *) device->private;
4462
4463 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4464 old_base = private->uid.base_unit_addr;
4465 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4466
4467 /* Read Configuration Data */
4468 rc = dasd_eckd_read_conf(device);
4469 if (rc)
4470 goto out_err;
4471
4472 rc = dasd_eckd_generate_uid(device);
4473 if (rc)
4474 goto out_err;
4475 /*
4476 * update unit address configuration and
4477 * add device to alias management
4478 */
4479 dasd_alias_update_add_device(device);
4480
4481 dasd_eckd_get_uid(device, &uid);
4482
4483 if (old_base != uid.base_unit_addr) {
4484 if (strlen(uid.vduit) > 0)
4485 snprintf(print_uid, sizeof(print_uid),
4486 "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4487 uid.ssid, uid.base_unit_addr, uid.vduit);
4488 else
4489 snprintf(print_uid, sizeof(print_uid),
4490 "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4491 uid.ssid, uid.base_unit_addr);
4492
4493 dev_info(&device->cdev->dev,
4494 "An Alias device was reassigned to a new base device "
4495 "with UID: %s\n", print_uid);
4496 }
4497 return 0;
4498
4499 out_err:
4500 return -1;
4501 }
4502
4503 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
4504 struct dasd_rssd_messages *messages,
4505 __u8 lpum)
4506 {
4507 struct dasd_rssd_messages *message_buf;
4508 struct dasd_psf_prssd_data *prssdp;
4509 struct dasd_eckd_private *private;
4510 struct dasd_ccw_req *cqr;
4511 struct ccw1 *ccw;
4512 int rc;
4513
4514 private = (struct dasd_eckd_private *) device->private;
4515 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
4516 (sizeof(struct dasd_psf_prssd_data) +
4517 sizeof(struct dasd_rssd_messages)),
4518 device);
4519 if (IS_ERR(cqr)) {
4520 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
4521 "Could not allocate read message buffer request");
4522 return PTR_ERR(cqr);
4523 }
4524
4525 cqr->startdev = device;
4526 cqr->memdev = device;
4527 cqr->block = NULL;
4528 cqr->retries = 256;
4529 cqr->expires = 10 * HZ;
4530
4531 /* we need to check for messages on exactly this path */
4532 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
4533 cqr->lpm = lpum;
4534
4535 /* Prepare for Read Subsystem Data */
4536 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4537 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4538 prssdp->order = PSF_ORDER_PRSSD;
4539 prssdp->suborder = 0x03; /* Message Buffer */
4540 /* all other bytes of prssdp must be zero */
4541
4542 ccw = cqr->cpaddr;
4543 ccw->cmd_code = DASD_ECKD_CCW_PSF;
4544 ccw->count = sizeof(struct dasd_psf_prssd_data);
4545 ccw->flags |= CCW_FLAG_CC;
4546 ccw->flags |= CCW_FLAG_SLI;
4547 ccw->cda = (__u32)(addr_t) prssdp;
4548
4549 /* Read Subsystem Data - message buffer */
4550 message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
4551 memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
4552
4553 ccw++;
4554 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4555 ccw->count = sizeof(struct dasd_rssd_messages);
4556 ccw->flags |= CCW_FLAG_SLI;
4557 ccw->cda = (__u32)(addr_t) message_buf;
4558
4559 cqr->buildclk = get_tod_clock();
4560 cqr->status = DASD_CQR_FILLED;
4561 rc = dasd_sleep_on_immediatly(cqr);
4562 if (rc == 0) {
4563 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4564 message_buf = (struct dasd_rssd_messages *)
4565 (prssdp + 1);
4566 memcpy(messages, message_buf,
4567 sizeof(struct dasd_rssd_messages));
4568 } else
4569 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4570 "Reading messages failed with rc=%d\n"
4571 , rc);
4572 dasd_sfree_request(cqr, cqr->memdev);
4573 return rc;
4574 }
4575
4576 /*
4577 * Perform Subsystem Function - CUIR response
4578 */
4579 static int
4580 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
4581 __u32 message_id,
4582 struct channel_path_desc *desc,
4583 struct subchannel_id sch_id)
4584 {
4585 struct dasd_psf_cuir_response *psf_cuir;
4586 struct dasd_ccw_req *cqr;
4587 struct ccw1 *ccw;
4588 int rc;
4589
4590 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
4591 sizeof(struct dasd_psf_cuir_response),
4592 device);
4593
4594 if (IS_ERR(cqr)) {
4595 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4596 "Could not allocate PSF-CUIR request");
4597 return PTR_ERR(cqr);
4598 }
4599
4600 psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
4601 psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
4602 psf_cuir->cc = response;
4603 if (desc)
4604 psf_cuir->chpid = desc->chpid;
4605 psf_cuir->message_id = message_id;
4606 psf_cuir->cssid = sch_id.cssid;
4607 psf_cuir->ssid = sch_id.ssid;
4608
4609 ccw = cqr->cpaddr;
4610 ccw->cmd_code = DASD_ECKD_CCW_PSF;
4611 ccw->cda = (__u32)(addr_t)psf_cuir;
4612 ccw->count = sizeof(struct dasd_psf_cuir_response);
4613
4614 cqr->startdev = device;
4615 cqr->memdev = device;
4616 cqr->block = NULL;
4617 cqr->retries = 256;
4618 cqr->expires = 10*HZ;
4619 cqr->buildclk = get_tod_clock();
4620 cqr->status = DASD_CQR_FILLED;
4621
4622 rc = dasd_sleep_on(cqr);
4623
4624 dasd_sfree_request(cqr, cqr->memdev);
4625 return rc;
4626 }
4627
4628 static int dasd_eckd_cuir_change_state(struct dasd_device *device, __u8 lpum)
4629 {
4630 unsigned long flags;
4631 __u8 tbcpm;
4632
4633 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4634 tbcpm = device->path_data.opm & ~lpum;
4635 if (tbcpm) {
4636 device->path_data.opm = tbcpm;
4637 device->path_data.cuirpm |= lpum;
4638 }
4639 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4640 return tbcpm ? 0 : PSF_CUIR_LAST_PATH;
4641 }
4642
4643 /*
4644 * walk through all devices and quiesce them
4645 * if it is the last path return error
4646 *
4647 * if only part of the devices are quiesced and an error
4648 * occurs no onlining necessary, the storage server will
4649 * notify the already set offline devices again
4650 */
4651 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
4652 struct channel_path_desc *desc,
4653 struct subchannel_id sch_id)
4654 {
4655 struct alias_pav_group *pavgroup, *tempgroup;
4656 struct dasd_eckd_private *private;
4657 struct dasd_device *dev, *n;
4658 int rc;
4659
4660 private = (struct dasd_eckd_private *) device->private;
4661 rc = 0;
4662
4663 /* active devices */
4664 list_for_each_entry_safe(dev, n,
4665 &private->lcu->active_devices,
4666 alias_list) {
4667 rc = dasd_eckd_cuir_change_state(dev, lpum);
4668 if (rc)
4669 goto out;
4670 }
4671
4672 /* inactive devices */
4673 list_for_each_entry_safe(dev, n,
4674 &private->lcu->inactive_devices,
4675 alias_list) {
4676 rc = dasd_eckd_cuir_change_state(dev, lpum);
4677 if (rc)
4678 goto out;
4679 }
4680
4681 /* devices in PAV groups */
4682 list_for_each_entry_safe(pavgroup, tempgroup,
4683 &private->lcu->grouplist, group) {
4684 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
4685 alias_list) {
4686 rc = dasd_eckd_cuir_change_state(dev, lpum);
4687 if (rc)
4688 goto out;
4689 }
4690 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
4691 alias_list) {
4692 rc = dasd_eckd_cuir_change_state(dev, lpum);
4693 if (rc)
4694 goto out;
4695 }
4696 }
4697
4698 pr_warn("Service on the storage server caused path %x.%02x to go offline",
4699 sch_id.cssid, desc ? desc->chpid : 0);
4700 rc = PSF_CUIR_COMPLETED;
4701 out:
4702 return rc;
4703 }
4704
4705 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
4706 struct channel_path_desc *desc,
4707 struct subchannel_id sch_id)
4708 {
4709 struct alias_pav_group *pavgroup, *tempgroup;
4710 struct dasd_eckd_private *private;
4711 struct dasd_device *dev, *n;
4712
4713 pr_info("Path %x.%02x is back online after service on the storage server",
4714 sch_id.cssid, desc ? desc->chpid : 0);
4715 private = (struct dasd_eckd_private *) device->private;
4716
4717 /*
4718 * the path may have been added through a generic path event before
4719 * only trigger path verification if the path is not already in use
4720 */
4721
4722 list_for_each_entry_safe(dev, n,
4723 &private->lcu->active_devices,
4724 alias_list) {
4725 if (!(dev->path_data.opm & lpum)) {
4726 dev->path_data.tbvpm |= lpum;
4727 dasd_schedule_device_bh(dev);
4728 }
4729 }
4730
4731 list_for_each_entry_safe(dev, n,
4732 &private->lcu->inactive_devices,
4733 alias_list) {
4734 if (!(dev->path_data.opm & lpum)) {
4735 dev->path_data.tbvpm |= lpum;
4736 dasd_schedule_device_bh(dev);
4737 }
4738 }
4739
4740 /* devices in PAV groups */
4741 list_for_each_entry_safe(pavgroup, tempgroup,
4742 &private->lcu->grouplist,
4743 group) {
4744 list_for_each_entry_safe(dev, n,
4745 &pavgroup->baselist,
4746 alias_list) {
4747 if (!(dev->path_data.opm & lpum)) {
4748 dev->path_data.tbvpm |= lpum;
4749 dasd_schedule_device_bh(dev);
4750 }
4751 }
4752 list_for_each_entry_safe(dev, n,
4753 &pavgroup->aliaslist,
4754 alias_list) {
4755 if (!(dev->path_data.opm & lpum)) {
4756 dev->path_data.tbvpm |= lpum;
4757 dasd_schedule_device_bh(dev);
4758 }
4759 }
4760 }
4761 return PSF_CUIR_COMPLETED;
4762 }
4763
4764 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
4765 __u8 lpum)
4766 {
4767 struct dasd_cuir_message *cuir = messages;
4768 struct channel_path_desc *desc;
4769 struct subchannel_id sch_id;
4770 int pos, response;
4771 ccw_device_get_schid(device->cdev, &sch_id);
4772
4773 /* get position of path in mask */
4774 pos = 8 - ffs(lpum);
4775 /* get channel path descriptor from this position */
4776 desc = ccw_device_get_chp_desc(device->cdev, pos);
4777
4778 if (cuir->code == CUIR_QUIESCE) {
4779 /* quiesce */
4780 response = dasd_eckd_cuir_quiesce(device, lpum, desc, sch_id);
4781 } else if (cuir->code == CUIR_RESUME) {
4782 /* resume */
4783 response = dasd_eckd_cuir_resume(device, lpum, desc, sch_id);
4784 } else
4785 response = PSF_CUIR_NOT_SUPPORTED;
4786
4787 dasd_eckd_psf_cuir_response(device, response, cuir->message_id,
4788 desc, sch_id);
4789
4790 /* free descriptor copy */
4791 kfree(desc);
4792 }
4793
4794 static void dasd_eckd_check_attention_work(struct work_struct *work)
4795 {
4796 struct check_attention_work_data *data;
4797 struct dasd_rssd_messages *messages;
4798 struct dasd_device *device;
4799 int rc;
4800
4801 data = container_of(work, struct check_attention_work_data, worker);
4802 device = data->device;
4803
4804 messages = kzalloc(sizeof(*messages), GFP_KERNEL);
4805 if (!messages) {
4806 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4807 "Could not allocate attention message buffer");
4808 goto out;
4809 }
4810
4811 rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
4812 if (rc)
4813 goto out;
4814
4815 if (messages->length == ATTENTION_LENGTH_CUIR &&
4816 messages->format == ATTENTION_FORMAT_CUIR)
4817 dasd_eckd_handle_cuir(device, messages, data->lpum);
4818
4819 out:
4820 dasd_put_device(device);
4821 kfree(messages);
4822 kfree(data);
4823 }
4824
4825 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
4826 {
4827 struct check_attention_work_data *data;
4828
4829 data = kzalloc(sizeof(*data), GFP_ATOMIC);
4830 if (!data)
4831 return -ENOMEM;
4832 INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
4833 dasd_get_device(device);
4834 data->device = device;
4835 data->lpum = lpum;
4836 schedule_work(&data->worker);
4837 return 0;
4838 }
4839
4840 static struct ccw_driver dasd_eckd_driver = {
4841 .driver = {
4842 .name = "dasd-eckd",
4843 .owner = THIS_MODULE,
4844 },
4845 .ids = dasd_eckd_ids,
4846 .probe = dasd_eckd_probe,
4847 .remove = dasd_generic_remove,
4848 .set_offline = dasd_generic_set_offline,
4849 .set_online = dasd_eckd_set_online,
4850 .notify = dasd_generic_notify,
4851 .path_event = dasd_generic_path_event,
4852 .shutdown = dasd_generic_shutdown,
4853 .freeze = dasd_generic_pm_freeze,
4854 .thaw = dasd_generic_restore_device,
4855 .restore = dasd_generic_restore_device,
4856 .uc_handler = dasd_generic_uc_handler,
4857 .int_class = IRQIO_DAS,
4858 };
4859
4860 /*
4861 * max_blocks is dependent on the amount of storage that is available
4862 * in the static io buffer for each device. Currently each device has
4863 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4864 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4865 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4866 * addition we have one define extent ccw + 16 bytes of data and one
4867 * locate record ccw + 16 bytes of data. That makes:
4868 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4869 * We want to fit two into the available memory so that we can immediately
4870 * start the next request if one finishes off. That makes 249.5 blocks
4871 * for one request. Give a little safety and the result is 240.
4872 */
4873 static struct dasd_discipline dasd_eckd_discipline = {
4874 .owner = THIS_MODULE,
4875 .name = "ECKD",
4876 .ebcname = "ECKD",
4877 .max_blocks = 190,
4878 .check_device = dasd_eckd_check_characteristics,
4879 .uncheck_device = dasd_eckd_uncheck_device,
4880 .do_analysis = dasd_eckd_do_analysis,
4881 .verify_path = dasd_eckd_verify_path,
4882 .basic_to_ready = dasd_eckd_basic_to_ready,
4883 .online_to_ready = dasd_eckd_online_to_ready,
4884 .basic_to_known = dasd_eckd_basic_to_known,
4885 .fill_geometry = dasd_eckd_fill_geometry,
4886 .start_IO = dasd_start_IO,
4887 .term_IO = dasd_term_IO,
4888 .handle_terminated_request = dasd_eckd_handle_terminated_request,
4889 .format_device = dasd_eckd_format_device,
4890 .erp_action = dasd_eckd_erp_action,
4891 .erp_postaction = dasd_eckd_erp_postaction,
4892 .check_for_device_change = dasd_eckd_check_for_device_change,
4893 .build_cp = dasd_eckd_build_alias_cp,
4894 .free_cp = dasd_eckd_free_alias_cp,
4895 .dump_sense = dasd_eckd_dump_sense,
4896 .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4897 .fill_info = dasd_eckd_fill_info,
4898 .ioctl = dasd_eckd_ioctl,
4899 .freeze = dasd_eckd_pm_freeze,
4900 .restore = dasd_eckd_restore_device,
4901 .reload = dasd_eckd_reload_device,
4902 .get_uid = dasd_eckd_get_uid,
4903 .kick_validate = dasd_eckd_kick_validate_server,
4904 .check_attention = dasd_eckd_check_attention,
4905 };
4906
4907 static int __init
4908 dasd_eckd_init(void)
4909 {
4910 int ret;
4911
4912 ASCEBC(dasd_eckd_discipline.ebcname, 4);
4913 dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4914 GFP_KERNEL | GFP_DMA);
4915 if (!dasd_reserve_req)
4916 return -ENOMEM;
4917 path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4918 GFP_KERNEL | GFP_DMA);
4919 if (!path_verification_worker) {
4920 kfree(dasd_reserve_req);
4921 return -ENOMEM;
4922 }
4923 rawpadpage = (void *)__get_free_page(GFP_KERNEL);
4924 if (!rawpadpage) {
4925 kfree(path_verification_worker);
4926 kfree(dasd_reserve_req);
4927 return -ENOMEM;
4928 }
4929 ret = ccw_driver_register(&dasd_eckd_driver);
4930 if (!ret)
4931 wait_for_device_probe();
4932 else {
4933 kfree(path_verification_worker);
4934 kfree(dasd_reserve_req);
4935 free_page((unsigned long)rawpadpage);
4936 }
4937 return ret;
4938 }
4939
4940 static void __exit
4941 dasd_eckd_cleanup(void)
4942 {
4943 ccw_driver_unregister(&dasd_eckd_driver);
4944 kfree(path_verification_worker);
4945 kfree(dasd_reserve_req);
4946 free_page((unsigned long)rawpadpage);
4947 }
4948
4949 module_init(dasd_eckd_init);
4950 module_exit(dasd_eckd_cleanup);
Linux with added FPC-III support