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s390/dasd: fix unresponsive device after all channel paths were lost
[deliverable/linux.git] / drivers / s390 / block / dasd_eckd.c
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
33 #include "dasd_int.h"
34 #include "dasd_eckd.h"
35
36 #ifdef PRINTK_HEADER
37 #undef PRINTK_HEADER
38 #endif /* PRINTK_HEADER */
39 #define PRINTK_HEADER "dasd(eckd):"
40
41 #define ECKD_C0(i) (i->home_bytes)
42 #define ECKD_F(i) (i->formula)
43 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
44 (i->factors.f_0x02.f1))
45 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
46 (i->factors.f_0x02.f2))
47 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
48 (i->factors.f_0x02.f3))
49 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
50 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
51 #define ECKD_F6(i) (i->factor6)
52 #define ECKD_F7(i) (i->factor7)
53 #define ECKD_F8(i) (i->factor8)
54
55 /*
56 * raw track access always map to 64k in memory
57 * so it maps to 16 blocks of 4k per track
58 */
59 #define DASD_RAW_BLOCK_PER_TRACK 16
60 #define DASD_RAW_BLOCKSIZE 4096
61 /* 64k are 128 x 512 byte sectors */
62 #define DASD_RAW_SECTORS_PER_TRACK 128
63
64 MODULE_LICENSE("GPL");
65
66 static struct dasd_discipline dasd_eckd_discipline;
67
68 /* The ccw bus type uses this table to find devices that it sends to
69 * dasd_eckd_probe */
70 static struct ccw_device_id dasd_eckd_ids[] = {
71 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
72 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
73 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
74 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
75 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
76 { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
77 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
78 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
79 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
80 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
81 { /* end of list */ },
82 };
83
84 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
85
86 static struct ccw_driver dasd_eckd_driver; /* see below */
87
88 #define INIT_CQR_OK 0
89 #define INIT_CQR_UNFORMATTED 1
90 #define INIT_CQR_ERROR 2
91
92 /* emergency request for reserve/release */
93 static struct {
94 struct dasd_ccw_req cqr;
95 struct ccw1 ccw;
96 char data[32];
97 } *dasd_reserve_req;
98 static DEFINE_MUTEX(dasd_reserve_mutex);
99
100 /* definitions for the path verification worker */
101 struct path_verification_work_data {
102 struct work_struct worker;
103 struct dasd_device *device;
104 struct dasd_ccw_req cqr;
105 struct ccw1 ccw;
106 __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
107 int isglobal;
108 __u8 tbvpm;
109 };
110 static struct path_verification_work_data *path_verification_worker;
111 static DEFINE_MUTEX(dasd_path_verification_mutex);
112
113 /* initial attempt at a probe function. this can be simplified once
114 * the other detection code is gone */
115 static int
116 dasd_eckd_probe (struct ccw_device *cdev)
117 {
118 int ret;
119
120 /* set ECKD specific ccw-device options */
121 ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
122 CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
123 if (ret) {
124 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
125 "dasd_eckd_probe: could not set "
126 "ccw-device options");
127 return ret;
128 }
129 ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
130 return ret;
131 }
132
133 static int
134 dasd_eckd_set_online(struct ccw_device *cdev)
135 {
136 return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
137 }
138
139 static const int sizes_trk0[] = { 28, 148, 84 };
140 #define LABEL_SIZE 140
141
142 /* head and record addresses of count_area read in analysis ccw */
143 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
144 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
145
146 static inline unsigned int
147 round_up_multiple(unsigned int no, unsigned int mult)
148 {
149 int rem = no % mult;
150 return (rem ? no - rem + mult : no);
151 }
152
153 static inline unsigned int
154 ceil_quot(unsigned int d1, unsigned int d2)
155 {
156 return (d1 + (d2 - 1)) / d2;
157 }
158
159 static unsigned int
160 recs_per_track(struct dasd_eckd_characteristics * rdc,
161 unsigned int kl, unsigned int dl)
162 {
163 int dn, kn;
164
165 switch (rdc->dev_type) {
166 case 0x3380:
167 if (kl)
168 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
169 ceil_quot(dl + 12, 32));
170 else
171 return 1499 / (15 + ceil_quot(dl + 12, 32));
172 case 0x3390:
173 dn = ceil_quot(dl + 6, 232) + 1;
174 if (kl) {
175 kn = ceil_quot(kl + 6, 232) + 1;
176 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
177 9 + ceil_quot(dl + 6 * dn, 34));
178 } else
179 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
180 case 0x9345:
181 dn = ceil_quot(dl + 6, 232) + 1;
182 if (kl) {
183 kn = ceil_quot(kl + 6, 232) + 1;
184 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
185 ceil_quot(dl + 6 * dn, 34));
186 } else
187 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
188 }
189 return 0;
190 }
191
192 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
193 {
194 geo->cyl = (__u16) cyl;
195 geo->head = cyl >> 16;
196 geo->head <<= 4;
197 geo->head |= head;
198 }
199
200 static int
201 check_XRC (struct ccw1 *de_ccw,
202 struct DE_eckd_data *data,
203 struct dasd_device *device)
204 {
205 struct dasd_eckd_private *private;
206 int rc;
207
208 private = (struct dasd_eckd_private *) device->private;
209 if (!private->rdc_data.facilities.XRC_supported)
210 return 0;
211
212 /* switch on System Time Stamp - needed for XRC Support */
213 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
214 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
215
216 rc = get_sync_clock(&data->ep_sys_time);
217 /* Ignore return code if sync clock is switched off. */
218 if (rc == -EOPNOTSUPP || rc == -EACCES)
219 rc = 0;
220
221 de_ccw->count = sizeof(struct DE_eckd_data);
222 de_ccw->flags |= CCW_FLAG_SLI;
223 return rc;
224 }
225
226 static int
227 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
228 unsigned int totrk, int cmd, struct dasd_device *device)
229 {
230 struct dasd_eckd_private *private;
231 u32 begcyl, endcyl;
232 u16 heads, beghead, endhead;
233 int rc = 0;
234
235 private = (struct dasd_eckd_private *) device->private;
236
237 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
238 ccw->flags = 0;
239 ccw->count = 16;
240 ccw->cda = (__u32) __pa(data);
241
242 memset(data, 0, sizeof(struct DE_eckd_data));
243 switch (cmd) {
244 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
245 case DASD_ECKD_CCW_READ_RECORD_ZERO:
246 case DASD_ECKD_CCW_READ:
247 case DASD_ECKD_CCW_READ_MT:
248 case DASD_ECKD_CCW_READ_CKD:
249 case DASD_ECKD_CCW_READ_CKD_MT:
250 case DASD_ECKD_CCW_READ_KD:
251 case DASD_ECKD_CCW_READ_KD_MT:
252 case DASD_ECKD_CCW_READ_COUNT:
253 data->mask.perm = 0x1;
254 data->attributes.operation = private->attrib.operation;
255 break;
256 case DASD_ECKD_CCW_WRITE:
257 case DASD_ECKD_CCW_WRITE_MT:
258 case DASD_ECKD_CCW_WRITE_KD:
259 case DASD_ECKD_CCW_WRITE_KD_MT:
260 data->mask.perm = 0x02;
261 data->attributes.operation = private->attrib.operation;
262 rc = check_XRC (ccw, data, device);
263 break;
264 case DASD_ECKD_CCW_WRITE_CKD:
265 case DASD_ECKD_CCW_WRITE_CKD_MT:
266 data->attributes.operation = DASD_BYPASS_CACHE;
267 rc = check_XRC (ccw, data, device);
268 break;
269 case DASD_ECKD_CCW_ERASE:
270 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
271 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
272 data->mask.perm = 0x3;
273 data->mask.auth = 0x1;
274 data->attributes.operation = DASD_BYPASS_CACHE;
275 rc = check_XRC (ccw, data, device);
276 break;
277 default:
278 dev_err(&device->cdev->dev,
279 "0x%x is not a known command\n", cmd);
280 break;
281 }
282
283 data->attributes.mode = 0x3; /* ECKD */
284
285 if ((private->rdc_data.cu_type == 0x2105 ||
286 private->rdc_data.cu_type == 0x2107 ||
287 private->rdc_data.cu_type == 0x1750)
288 && !(private->uses_cdl && trk < 2))
289 data->ga_extended |= 0x40; /* Regular Data Format Mode */
290
291 heads = private->rdc_data.trk_per_cyl;
292 begcyl = trk / heads;
293 beghead = trk % heads;
294 endcyl = totrk / heads;
295 endhead = totrk % heads;
296
297 /* check for sequential prestage - enhance cylinder range */
298 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
299 data->attributes.operation == DASD_SEQ_ACCESS) {
300
301 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
302 endcyl += private->attrib.nr_cyl;
303 else
304 endcyl = (private->real_cyl - 1);
305 }
306
307 set_ch_t(&data->beg_ext, begcyl, beghead);
308 set_ch_t(&data->end_ext, endcyl, endhead);
309 return rc;
310 }
311
312 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
313 struct dasd_device *device)
314 {
315 struct dasd_eckd_private *private;
316 int rc;
317
318 private = (struct dasd_eckd_private *) device->private;
319 if (!private->rdc_data.facilities.XRC_supported)
320 return 0;
321
322 /* switch on System Time Stamp - needed for XRC Support */
323 pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid' */
324 pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
325 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
326
327 rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
328 /* Ignore return code if sync clock is switched off. */
329 if (rc == -EOPNOTSUPP || rc == -EACCES)
330 rc = 0;
331 return rc;
332 }
333
334 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
335 unsigned int rec_on_trk, int count, int cmd,
336 struct dasd_device *device, unsigned int reclen,
337 unsigned int tlf)
338 {
339 struct dasd_eckd_private *private;
340 int sector;
341 int dn, d;
342
343 private = (struct dasd_eckd_private *) device->private;
344
345 memset(data, 0, sizeof(*data));
346 sector = 0;
347 if (rec_on_trk) {
348 switch (private->rdc_data.dev_type) {
349 case 0x3390:
350 dn = ceil_quot(reclen + 6, 232);
351 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
352 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
353 break;
354 case 0x3380:
355 d = 7 + ceil_quot(reclen + 12, 32);
356 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
357 break;
358 }
359 }
360 data->sector = sector;
361 /* note: meaning of count depends on the operation
362 * for record based I/O it's the number of records, but for
363 * track based I/O it's the number of tracks
364 */
365 data->count = count;
366 switch (cmd) {
367 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
368 data->operation.orientation = 0x3;
369 data->operation.operation = 0x03;
370 break;
371 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
372 data->operation.orientation = 0x3;
373 data->operation.operation = 0x16;
374 break;
375 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
376 data->operation.orientation = 0x1;
377 data->operation.operation = 0x03;
378 data->count++;
379 break;
380 case DASD_ECKD_CCW_READ_RECORD_ZERO:
381 data->operation.orientation = 0x3;
382 data->operation.operation = 0x16;
383 data->count++;
384 break;
385 case DASD_ECKD_CCW_WRITE:
386 case DASD_ECKD_CCW_WRITE_MT:
387 case DASD_ECKD_CCW_WRITE_KD:
388 case DASD_ECKD_CCW_WRITE_KD_MT:
389 data->auxiliary.length_valid = 0x1;
390 data->length = reclen;
391 data->operation.operation = 0x01;
392 break;
393 case DASD_ECKD_CCW_WRITE_CKD:
394 case DASD_ECKD_CCW_WRITE_CKD_MT:
395 data->auxiliary.length_valid = 0x1;
396 data->length = reclen;
397 data->operation.operation = 0x03;
398 break;
399 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
400 data->operation.orientation = 0x0;
401 data->operation.operation = 0x3F;
402 data->extended_operation = 0x11;
403 data->length = 0;
404 data->extended_parameter_length = 0x02;
405 if (data->count > 8) {
406 data->extended_parameter[0] = 0xFF;
407 data->extended_parameter[1] = 0xFF;
408 data->extended_parameter[1] <<= (16 - count);
409 } else {
410 data->extended_parameter[0] = 0xFF;
411 data->extended_parameter[0] <<= (8 - count);
412 data->extended_parameter[1] = 0x00;
413 }
414 data->sector = 0xFF;
415 break;
416 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
417 data->auxiliary.length_valid = 0x1;
418 data->length = reclen; /* not tlf, as one might think */
419 data->operation.operation = 0x3F;
420 data->extended_operation = 0x23;
421 break;
422 case DASD_ECKD_CCW_READ:
423 case DASD_ECKD_CCW_READ_MT:
424 case DASD_ECKD_CCW_READ_KD:
425 case DASD_ECKD_CCW_READ_KD_MT:
426 data->auxiliary.length_valid = 0x1;
427 data->length = reclen;
428 data->operation.operation = 0x06;
429 break;
430 case DASD_ECKD_CCW_READ_CKD:
431 case DASD_ECKD_CCW_READ_CKD_MT:
432 data->auxiliary.length_valid = 0x1;
433 data->length = reclen;
434 data->operation.operation = 0x16;
435 break;
436 case DASD_ECKD_CCW_READ_COUNT:
437 data->operation.operation = 0x06;
438 break;
439 case DASD_ECKD_CCW_READ_TRACK:
440 data->operation.orientation = 0x1;
441 data->operation.operation = 0x0C;
442 data->extended_parameter_length = 0;
443 data->sector = 0xFF;
444 break;
445 case DASD_ECKD_CCW_READ_TRACK_DATA:
446 data->auxiliary.length_valid = 0x1;
447 data->length = tlf;
448 data->operation.operation = 0x0C;
449 break;
450 case DASD_ECKD_CCW_ERASE:
451 data->length = reclen;
452 data->auxiliary.length_valid = 0x1;
453 data->operation.operation = 0x0b;
454 break;
455 default:
456 DBF_DEV_EVENT(DBF_ERR, device,
457 "fill LRE unknown opcode 0x%x", cmd);
458 BUG();
459 }
460 set_ch_t(&data->seek_addr,
461 trk / private->rdc_data.trk_per_cyl,
462 trk % private->rdc_data.trk_per_cyl);
463 data->search_arg.cyl = data->seek_addr.cyl;
464 data->search_arg.head = data->seek_addr.head;
465 data->search_arg.record = rec_on_trk;
466 }
467
468 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
469 unsigned int trk, unsigned int totrk, int cmd,
470 struct dasd_device *basedev, struct dasd_device *startdev,
471 unsigned char format, unsigned int rec_on_trk, int count,
472 unsigned int blksize, unsigned int tlf)
473 {
474 struct dasd_eckd_private *basepriv, *startpriv;
475 struct DE_eckd_data *dedata;
476 struct LRE_eckd_data *lredata;
477 u32 begcyl, endcyl;
478 u16 heads, beghead, endhead;
479 int rc = 0;
480
481 basepriv = (struct dasd_eckd_private *) basedev->private;
482 startpriv = (struct dasd_eckd_private *) startdev->private;
483 dedata = &pfxdata->define_extent;
484 lredata = &pfxdata->locate_record;
485
486 ccw->cmd_code = DASD_ECKD_CCW_PFX;
487 ccw->flags = 0;
488 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
489 ccw->count = sizeof(*pfxdata) + 2;
490 ccw->cda = (__u32) __pa(pfxdata);
491 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
492 } else {
493 ccw->count = sizeof(*pfxdata);
494 ccw->cda = (__u32) __pa(pfxdata);
495 memset(pfxdata, 0, sizeof(*pfxdata));
496 }
497
498 /* prefix data */
499 if (format > 1) {
500 DBF_DEV_EVENT(DBF_ERR, basedev,
501 "PFX LRE unknown format 0x%x", format);
502 BUG();
503 return -EINVAL;
504 }
505 pfxdata->format = format;
506 pfxdata->base_address = basepriv->ned->unit_addr;
507 pfxdata->base_lss = basepriv->ned->ID;
508 pfxdata->validity.define_extent = 1;
509
510 /* private uid is kept up to date, conf_data may be outdated */
511 if (startpriv->uid.type != UA_BASE_DEVICE) {
512 pfxdata->validity.verify_base = 1;
513 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
514 pfxdata->validity.hyper_pav = 1;
515 }
516
517 /* define extend data (mostly)*/
518 switch (cmd) {
519 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
520 case DASD_ECKD_CCW_READ_RECORD_ZERO:
521 case DASD_ECKD_CCW_READ:
522 case DASD_ECKD_CCW_READ_MT:
523 case DASD_ECKD_CCW_READ_CKD:
524 case DASD_ECKD_CCW_READ_CKD_MT:
525 case DASD_ECKD_CCW_READ_KD:
526 case DASD_ECKD_CCW_READ_KD_MT:
527 case DASD_ECKD_CCW_READ_COUNT:
528 dedata->mask.perm = 0x1;
529 dedata->attributes.operation = basepriv->attrib.operation;
530 break;
531 case DASD_ECKD_CCW_READ_TRACK:
532 case DASD_ECKD_CCW_READ_TRACK_DATA:
533 dedata->mask.perm = 0x1;
534 dedata->attributes.operation = basepriv->attrib.operation;
535 dedata->blk_size = 0;
536 break;
537 case DASD_ECKD_CCW_WRITE:
538 case DASD_ECKD_CCW_WRITE_MT:
539 case DASD_ECKD_CCW_WRITE_KD:
540 case DASD_ECKD_CCW_WRITE_KD_MT:
541 dedata->mask.perm = 0x02;
542 dedata->attributes.operation = basepriv->attrib.operation;
543 rc = check_XRC_on_prefix(pfxdata, basedev);
544 break;
545 case DASD_ECKD_CCW_WRITE_CKD:
546 case DASD_ECKD_CCW_WRITE_CKD_MT:
547 dedata->attributes.operation = DASD_BYPASS_CACHE;
548 rc = check_XRC_on_prefix(pfxdata, basedev);
549 break;
550 case DASD_ECKD_CCW_ERASE:
551 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
552 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
553 dedata->mask.perm = 0x3;
554 dedata->mask.auth = 0x1;
555 dedata->attributes.operation = DASD_BYPASS_CACHE;
556 rc = check_XRC_on_prefix(pfxdata, basedev);
557 break;
558 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
559 dedata->mask.perm = 0x03;
560 dedata->attributes.operation = basepriv->attrib.operation;
561 dedata->blk_size = 0;
562 break;
563 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
564 dedata->mask.perm = 0x02;
565 dedata->attributes.operation = basepriv->attrib.operation;
566 dedata->blk_size = blksize;
567 rc = check_XRC_on_prefix(pfxdata, basedev);
568 break;
569 default:
570 DBF_DEV_EVENT(DBF_ERR, basedev,
571 "PFX LRE unknown opcode 0x%x", cmd);
572 BUG();
573 return -EINVAL;
574 }
575
576 dedata->attributes.mode = 0x3; /* ECKD */
577
578 if ((basepriv->rdc_data.cu_type == 0x2105 ||
579 basepriv->rdc_data.cu_type == 0x2107 ||
580 basepriv->rdc_data.cu_type == 0x1750)
581 && !(basepriv->uses_cdl && trk < 2))
582 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
583
584 heads = basepriv->rdc_data.trk_per_cyl;
585 begcyl = trk / heads;
586 beghead = trk % heads;
587 endcyl = totrk / heads;
588 endhead = totrk % heads;
589
590 /* check for sequential prestage - enhance cylinder range */
591 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
592 dedata->attributes.operation == DASD_SEQ_ACCESS) {
593
594 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
595 endcyl += basepriv->attrib.nr_cyl;
596 else
597 endcyl = (basepriv->real_cyl - 1);
598 }
599
600 set_ch_t(&dedata->beg_ext, begcyl, beghead);
601 set_ch_t(&dedata->end_ext, endcyl, endhead);
602
603 if (format == 1) {
604 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
605 basedev, blksize, tlf);
606 }
607
608 return rc;
609 }
610
611 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
612 unsigned int trk, unsigned int totrk, int cmd,
613 struct dasd_device *basedev, struct dasd_device *startdev)
614 {
615 return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
616 0, 0, 0, 0, 0);
617 }
618
619 static void
620 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
621 unsigned int rec_on_trk, int no_rec, int cmd,
622 struct dasd_device * device, int reclen)
623 {
624 struct dasd_eckd_private *private;
625 int sector;
626 int dn, d;
627
628 private = (struct dasd_eckd_private *) device->private;
629
630 DBF_DEV_EVENT(DBF_INFO, device,
631 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
632 trk, rec_on_trk, no_rec, cmd, reclen);
633
634 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
635 ccw->flags = 0;
636 ccw->count = 16;
637 ccw->cda = (__u32) __pa(data);
638
639 memset(data, 0, sizeof(struct LO_eckd_data));
640 sector = 0;
641 if (rec_on_trk) {
642 switch (private->rdc_data.dev_type) {
643 case 0x3390:
644 dn = ceil_quot(reclen + 6, 232);
645 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
646 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
647 break;
648 case 0x3380:
649 d = 7 + ceil_quot(reclen + 12, 32);
650 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
651 break;
652 }
653 }
654 data->sector = sector;
655 data->count = no_rec;
656 switch (cmd) {
657 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
658 data->operation.orientation = 0x3;
659 data->operation.operation = 0x03;
660 break;
661 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
662 data->operation.orientation = 0x3;
663 data->operation.operation = 0x16;
664 break;
665 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
666 data->operation.orientation = 0x1;
667 data->operation.operation = 0x03;
668 data->count++;
669 break;
670 case DASD_ECKD_CCW_READ_RECORD_ZERO:
671 data->operation.orientation = 0x3;
672 data->operation.operation = 0x16;
673 data->count++;
674 break;
675 case DASD_ECKD_CCW_WRITE:
676 case DASD_ECKD_CCW_WRITE_MT:
677 case DASD_ECKD_CCW_WRITE_KD:
678 case DASD_ECKD_CCW_WRITE_KD_MT:
679 data->auxiliary.last_bytes_used = 0x1;
680 data->length = reclen;
681 data->operation.operation = 0x01;
682 break;
683 case DASD_ECKD_CCW_WRITE_CKD:
684 case DASD_ECKD_CCW_WRITE_CKD_MT:
685 data->auxiliary.last_bytes_used = 0x1;
686 data->length = reclen;
687 data->operation.operation = 0x03;
688 break;
689 case DASD_ECKD_CCW_READ:
690 case DASD_ECKD_CCW_READ_MT:
691 case DASD_ECKD_CCW_READ_KD:
692 case DASD_ECKD_CCW_READ_KD_MT:
693 data->auxiliary.last_bytes_used = 0x1;
694 data->length = reclen;
695 data->operation.operation = 0x06;
696 break;
697 case DASD_ECKD_CCW_READ_CKD:
698 case DASD_ECKD_CCW_READ_CKD_MT:
699 data->auxiliary.last_bytes_used = 0x1;
700 data->length = reclen;
701 data->operation.operation = 0x16;
702 break;
703 case DASD_ECKD_CCW_READ_COUNT:
704 data->operation.operation = 0x06;
705 break;
706 case DASD_ECKD_CCW_ERASE:
707 data->length = reclen;
708 data->auxiliary.last_bytes_used = 0x1;
709 data->operation.operation = 0x0b;
710 break;
711 default:
712 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
713 "opcode 0x%x", cmd);
714 }
715 set_ch_t(&data->seek_addr,
716 trk / private->rdc_data.trk_per_cyl,
717 trk % private->rdc_data.trk_per_cyl);
718 data->search_arg.cyl = data->seek_addr.cyl;
719 data->search_arg.head = data->seek_addr.head;
720 data->search_arg.record = rec_on_trk;
721 }
722
723 /*
724 * Returns 1 if the block is one of the special blocks that needs
725 * to get read/written with the KD variant of the command.
726 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
727 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
728 * Luckily the KD variants differ only by one bit (0x08) from the
729 * normal variant. So don't wonder about code like:
730 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
731 * ccw->cmd_code |= 0x8;
732 */
733 static inline int
734 dasd_eckd_cdl_special(int blk_per_trk, int recid)
735 {
736 if (recid < 3)
737 return 1;
738 if (recid < blk_per_trk)
739 return 0;
740 if (recid < 2 * blk_per_trk)
741 return 1;
742 return 0;
743 }
744
745 /*
746 * Returns the record size for the special blocks of the cdl format.
747 * Only returns something useful if dasd_eckd_cdl_special is true
748 * for the recid.
749 */
750 static inline int
751 dasd_eckd_cdl_reclen(int recid)
752 {
753 if (recid < 3)
754 return sizes_trk0[recid];
755 return LABEL_SIZE;
756 }
757 /* create unique id from private structure. */
758 static void create_uid(struct dasd_eckd_private *private)
759 {
760 int count;
761 struct dasd_uid *uid;
762
763 uid = &private->uid;
764 memset(uid, 0, sizeof(struct dasd_uid));
765 memcpy(uid->vendor, private->ned->HDA_manufacturer,
766 sizeof(uid->vendor) - 1);
767 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
768 memcpy(uid->serial, private->ned->HDA_location,
769 sizeof(uid->serial) - 1);
770 EBCASC(uid->serial, sizeof(uid->serial) - 1);
771 uid->ssid = private->gneq->subsystemID;
772 uid->real_unit_addr = private->ned->unit_addr;
773 if (private->sneq) {
774 uid->type = private->sneq->sua_flags;
775 if (uid->type == UA_BASE_PAV_ALIAS)
776 uid->base_unit_addr = private->sneq->base_unit_addr;
777 } else {
778 uid->type = UA_BASE_DEVICE;
779 }
780 if (private->vdsneq) {
781 for (count = 0; count < 16; count++) {
782 sprintf(uid->vduit+2*count, "%02x",
783 private->vdsneq->uit[count]);
784 }
785 }
786 }
787
788 /*
789 * Generate device unique id that specifies the physical device.
790 */
791 static int dasd_eckd_generate_uid(struct dasd_device *device)
792 {
793 struct dasd_eckd_private *private;
794 unsigned long flags;
795
796 private = (struct dasd_eckd_private *) device->private;
797 if (!private)
798 return -ENODEV;
799 if (!private->ned || !private->gneq)
800 return -ENODEV;
801 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
802 create_uid(private);
803 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
804 return 0;
805 }
806
807 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
808 {
809 struct dasd_eckd_private *private;
810 unsigned long flags;
811
812 if (device->private) {
813 private = (struct dasd_eckd_private *)device->private;
814 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
815 *uid = private->uid;
816 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
817 return 0;
818 }
819 return -EINVAL;
820 }
821
822 /*
823 * compare device UID with data of a given dasd_eckd_private structure
824 * return 0 for match
825 */
826 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
827 struct dasd_eckd_private *private)
828 {
829 struct dasd_uid device_uid;
830
831 create_uid(private);
832 dasd_eckd_get_uid(device, &device_uid);
833
834 return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
835 }
836
837 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
838 struct dasd_ccw_req *cqr,
839 __u8 *rcd_buffer,
840 __u8 lpm)
841 {
842 struct ccw1 *ccw;
843 /*
844 * buffer has to start with EBCDIC "V1.0" to show
845 * support for virtual device SNEQ
846 */
847 rcd_buffer[0] = 0xE5;
848 rcd_buffer[1] = 0xF1;
849 rcd_buffer[2] = 0x4B;
850 rcd_buffer[3] = 0xF0;
851
852 ccw = cqr->cpaddr;
853 ccw->cmd_code = DASD_ECKD_CCW_RCD;
854 ccw->flags = 0;
855 ccw->cda = (__u32)(addr_t)rcd_buffer;
856 ccw->count = DASD_ECKD_RCD_DATA_SIZE;
857 cqr->magic = DASD_ECKD_MAGIC;
858
859 cqr->startdev = device;
860 cqr->memdev = device;
861 cqr->block = NULL;
862 cqr->expires = 10*HZ;
863 cqr->lpm = lpm;
864 cqr->retries = 256;
865 cqr->buildclk = get_tod_clock();
866 cqr->status = DASD_CQR_FILLED;
867 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
868 }
869
870 /*
871 * Wakeup helper for read_conf
872 * if the cqr is not done and needs some error recovery
873 * the buffer has to be re-initialized with the EBCDIC "V1.0"
874 * to show support for virtual device SNEQ
875 */
876 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
877 {
878 struct ccw1 *ccw;
879 __u8 *rcd_buffer;
880
881 if (cqr->status != DASD_CQR_DONE) {
882 ccw = cqr->cpaddr;
883 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
884 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
885
886 rcd_buffer[0] = 0xE5;
887 rcd_buffer[1] = 0xF1;
888 rcd_buffer[2] = 0x4B;
889 rcd_buffer[3] = 0xF0;
890 }
891 dasd_wakeup_cb(cqr, data);
892 }
893
894 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
895 struct dasd_ccw_req *cqr,
896 __u8 *rcd_buffer,
897 __u8 lpm)
898 {
899 struct ciw *ciw;
900 int rc;
901 /*
902 * sanity check: scan for RCD command in extended SenseID data
903 * some devices do not support RCD
904 */
905 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
906 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
907 return -EOPNOTSUPP;
908
909 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
910 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
911 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
912 cqr->retries = 5;
913 cqr->callback = read_conf_cb;
914 rc = dasd_sleep_on_immediatly(cqr);
915 return rc;
916 }
917
918 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
919 void **rcd_buffer,
920 int *rcd_buffer_size, __u8 lpm)
921 {
922 struct ciw *ciw;
923 char *rcd_buf = NULL;
924 int ret;
925 struct dasd_ccw_req *cqr;
926
927 /*
928 * sanity check: scan for RCD command in extended SenseID data
929 * some devices do not support RCD
930 */
931 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
932 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
933 ret = -EOPNOTSUPP;
934 goto out_error;
935 }
936 rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
937 if (!rcd_buf) {
938 ret = -ENOMEM;
939 goto out_error;
940 }
941 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
942 0, /* use rcd_buf as data ara */
943 device);
944 if (IS_ERR(cqr)) {
945 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
946 "Could not allocate RCD request");
947 ret = -ENOMEM;
948 goto out_error;
949 }
950 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
951 cqr->callback = read_conf_cb;
952 ret = dasd_sleep_on(cqr);
953 /*
954 * on success we update the user input parms
955 */
956 dasd_sfree_request(cqr, cqr->memdev);
957 if (ret)
958 goto out_error;
959
960 *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
961 *rcd_buffer = rcd_buf;
962 return 0;
963 out_error:
964 kfree(rcd_buf);
965 *rcd_buffer = NULL;
966 *rcd_buffer_size = 0;
967 return ret;
968 }
969
970 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
971 {
972
973 struct dasd_sneq *sneq;
974 int i, count;
975
976 private->ned = NULL;
977 private->sneq = NULL;
978 private->vdsneq = NULL;
979 private->gneq = NULL;
980 count = private->conf_len / sizeof(struct dasd_sneq);
981 sneq = (struct dasd_sneq *)private->conf_data;
982 for (i = 0; i < count; ++i) {
983 if (sneq->flags.identifier == 1 && sneq->format == 1)
984 private->sneq = sneq;
985 else if (sneq->flags.identifier == 1 && sneq->format == 4)
986 private->vdsneq = (struct vd_sneq *)sneq;
987 else if (sneq->flags.identifier == 2)
988 private->gneq = (struct dasd_gneq *)sneq;
989 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
990 private->ned = (struct dasd_ned *)sneq;
991 sneq++;
992 }
993 if (!private->ned || !private->gneq) {
994 private->ned = NULL;
995 private->sneq = NULL;
996 private->vdsneq = NULL;
997 private->gneq = NULL;
998 return -EINVAL;
999 }
1000 return 0;
1001
1002 };
1003
1004 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1005 {
1006 struct dasd_gneq *gneq;
1007 int i, count, found;
1008
1009 count = conf_len / sizeof(*gneq);
1010 gneq = (struct dasd_gneq *)conf_data;
1011 found = 0;
1012 for (i = 0; i < count; ++i) {
1013 if (gneq->flags.identifier == 2) {
1014 found = 1;
1015 break;
1016 }
1017 gneq++;
1018 }
1019 if (found)
1020 return ((char *)gneq)[18] & 0x07;
1021 else
1022 return 0;
1023 }
1024
1025 static int dasd_eckd_read_conf(struct dasd_device *device)
1026 {
1027 void *conf_data;
1028 int conf_len, conf_data_saved;
1029 int rc, path_err;
1030 __u8 lpm, opm;
1031 struct dasd_eckd_private *private, path_private;
1032 struct dasd_path *path_data;
1033 struct dasd_uid *uid;
1034 char print_path_uid[60], print_device_uid[60];
1035
1036 private = (struct dasd_eckd_private *) device->private;
1037 path_data = &device->path_data;
1038 opm = ccw_device_get_path_mask(device->cdev);
1039 conf_data_saved = 0;
1040 path_err = 0;
1041 /* get configuration data per operational path */
1042 for (lpm = 0x80; lpm; lpm>>= 1) {
1043 if (!(lpm & opm))
1044 continue;
1045 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1046 &conf_len, lpm);
1047 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
1048 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1049 "Read configuration data returned "
1050 "error %d", rc);
1051 return rc;
1052 }
1053 if (conf_data == NULL) {
1054 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1055 "No configuration data "
1056 "retrieved");
1057 /* no further analysis possible */
1058 path_data->opm |= lpm;
1059 continue; /* no error */
1060 }
1061 /* save first valid configuration data */
1062 if (!conf_data_saved) {
1063 kfree(private->conf_data);
1064 private->conf_data = conf_data;
1065 private->conf_len = conf_len;
1066 if (dasd_eckd_identify_conf_parts(private)) {
1067 private->conf_data = NULL;
1068 private->conf_len = 0;
1069 kfree(conf_data);
1070 continue;
1071 }
1072 /*
1073 * build device UID that other path data
1074 * can be compared to it
1075 */
1076 dasd_eckd_generate_uid(device);
1077 conf_data_saved++;
1078 } else {
1079 path_private.conf_data = conf_data;
1080 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1081 if (dasd_eckd_identify_conf_parts(
1082 &path_private)) {
1083 path_private.conf_data = NULL;
1084 path_private.conf_len = 0;
1085 kfree(conf_data);
1086 continue;
1087 }
1088
1089 if (dasd_eckd_compare_path_uid(
1090 device, &path_private)) {
1091 uid = &path_private.uid;
1092 if (strlen(uid->vduit) > 0)
1093 snprintf(print_path_uid,
1094 sizeof(print_path_uid),
1095 "%s.%s.%04x.%02x.%s",
1096 uid->vendor, uid->serial,
1097 uid->ssid, uid->real_unit_addr,
1098 uid->vduit);
1099 else
1100 snprintf(print_path_uid,
1101 sizeof(print_path_uid),
1102 "%s.%s.%04x.%02x",
1103 uid->vendor, uid->serial,
1104 uid->ssid,
1105 uid->real_unit_addr);
1106 uid = &private->uid;
1107 if (strlen(uid->vduit) > 0)
1108 snprintf(print_device_uid,
1109 sizeof(print_device_uid),
1110 "%s.%s.%04x.%02x.%s",
1111 uid->vendor, uid->serial,
1112 uid->ssid, uid->real_unit_addr,
1113 uid->vduit);
1114 else
1115 snprintf(print_device_uid,
1116 sizeof(print_device_uid),
1117 "%s.%s.%04x.%02x",
1118 uid->vendor, uid->serial,
1119 uid->ssid,
1120 uid->real_unit_addr);
1121 dev_err(&device->cdev->dev,
1122 "Not all channel paths lead to "
1123 "the same device, path %02X leads to "
1124 "device %s instead of %s\n", lpm,
1125 print_path_uid, print_device_uid);
1126 path_err = -EINVAL;
1127 continue;
1128 }
1129
1130 path_private.conf_data = NULL;
1131 path_private.conf_len = 0;
1132 }
1133 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1134 case 0x02:
1135 path_data->npm |= lpm;
1136 break;
1137 case 0x03:
1138 path_data->ppm |= lpm;
1139 break;
1140 }
1141 path_data->opm |= lpm;
1142
1143 if (conf_data != private->conf_data)
1144 kfree(conf_data);
1145 }
1146
1147 return path_err;
1148 }
1149
1150 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1151 {
1152 struct dasd_eckd_private *private;
1153 int mdc;
1154 u32 fcx_max_data;
1155
1156 private = (struct dasd_eckd_private *) device->private;
1157 if (private->fcx_max_data) {
1158 mdc = ccw_device_get_mdc(device->cdev, lpm);
1159 if ((mdc < 0)) {
1160 dev_warn(&device->cdev->dev,
1161 "Detecting the maximum data size for zHPF "
1162 "requests failed (rc=%d) for a new path %x\n",
1163 mdc, lpm);
1164 return mdc;
1165 }
1166 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1167 if (fcx_max_data < private->fcx_max_data) {
1168 dev_warn(&device->cdev->dev,
1169 "The maximum data size for zHPF requests %u "
1170 "on a new path %x is below the active maximum "
1171 "%u\n", fcx_max_data, lpm,
1172 private->fcx_max_data);
1173 return -EACCES;
1174 }
1175 }
1176 return 0;
1177 }
1178
1179 static int rebuild_device_uid(struct dasd_device *device,
1180 struct path_verification_work_data *data)
1181 {
1182 struct dasd_eckd_private *private;
1183 struct dasd_path *path_data;
1184 __u8 lpm, opm;
1185 int rc;
1186
1187 rc = -ENODEV;
1188 private = (struct dasd_eckd_private *) device->private;
1189 path_data = &device->path_data;
1190 opm = device->path_data.opm;
1191
1192 for (lpm = 0x80; lpm; lpm >>= 1) {
1193 if (!(lpm & opm))
1194 continue;
1195 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1196 memset(&data->cqr, 0, sizeof(data->cqr));
1197 data->cqr.cpaddr = &data->ccw;
1198 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1199 data->rcd_buffer,
1200 lpm);
1201
1202 if (rc) {
1203 if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1204 continue;
1205 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1206 "Read configuration data "
1207 "returned error %d", rc);
1208 break;
1209 }
1210 memcpy(private->conf_data, data->rcd_buffer,
1211 DASD_ECKD_RCD_DATA_SIZE);
1212 if (dasd_eckd_identify_conf_parts(private)) {
1213 rc = -ENODEV;
1214 } else /* first valid path is enough */
1215 break;
1216 }
1217
1218 if (!rc)
1219 rc = dasd_eckd_generate_uid(device);
1220
1221 return rc;
1222 }
1223
1224 static void do_path_verification_work(struct work_struct *work)
1225 {
1226 struct path_verification_work_data *data;
1227 struct dasd_device *device;
1228 struct dasd_eckd_private path_private;
1229 struct dasd_uid *uid;
1230 __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1231 __u8 lpm, opm, npm, ppm, epm;
1232 unsigned long flags;
1233 char print_uid[60];
1234 int rc;
1235
1236 data = container_of(work, struct path_verification_work_data, worker);
1237 device = data->device;
1238
1239 /* delay path verification until device was resumed */
1240 if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1241 schedule_work(work);
1242 return;
1243 }
1244
1245 opm = 0;
1246 npm = 0;
1247 ppm = 0;
1248 epm = 0;
1249 for (lpm = 0x80; lpm; lpm >>= 1) {
1250 if (!(lpm & data->tbvpm))
1251 continue;
1252 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1253 memset(&data->cqr, 0, sizeof(data->cqr));
1254 data->cqr.cpaddr = &data->ccw;
1255 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1256 data->rcd_buffer,
1257 lpm);
1258 if (!rc) {
1259 switch (dasd_eckd_path_access(data->rcd_buffer,
1260 DASD_ECKD_RCD_DATA_SIZE)
1261 ) {
1262 case 0x02:
1263 npm |= lpm;
1264 break;
1265 case 0x03:
1266 ppm |= lpm;
1267 break;
1268 }
1269 opm |= lpm;
1270 } else if (rc == -EOPNOTSUPP) {
1271 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1272 "path verification: No configuration "
1273 "data retrieved");
1274 opm |= lpm;
1275 } else if (rc == -EAGAIN) {
1276 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1277 "path verification: device is stopped,"
1278 " try again later");
1279 epm |= lpm;
1280 } else {
1281 dev_warn(&device->cdev->dev,
1282 "Reading device feature codes failed "
1283 "(rc=%d) for new path %x\n", rc, lpm);
1284 continue;
1285 }
1286 if (verify_fcx_max_data(device, lpm)) {
1287 opm &= ~lpm;
1288 npm &= ~lpm;
1289 ppm &= ~lpm;
1290 continue;
1291 }
1292
1293 /*
1294 * save conf_data for comparison after
1295 * rebuild_device_uid may have changed
1296 * the original data
1297 */
1298 memcpy(&path_rcd_buf, data->rcd_buffer,
1299 DASD_ECKD_RCD_DATA_SIZE);
1300 path_private.conf_data = (void *) &path_rcd_buf;
1301 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1302 if (dasd_eckd_identify_conf_parts(&path_private)) {
1303 path_private.conf_data = NULL;
1304 path_private.conf_len = 0;
1305 continue;
1306 }
1307
1308 /*
1309 * compare path UID with device UID only if at least
1310 * one valid path is left
1311 * in other case the device UID may have changed and
1312 * the first working path UID will be used as device UID
1313 */
1314 if (device->path_data.opm &&
1315 dasd_eckd_compare_path_uid(device, &path_private)) {
1316 /*
1317 * the comparison was not successful
1318 * rebuild the device UID with at least one
1319 * known path in case a z/VM hyperswap command
1320 * has changed the device
1321 *
1322 * after this compare again
1323 *
1324 * if either the rebuild or the recompare fails
1325 * the path can not be used
1326 */
1327 if (rebuild_device_uid(device, data) ||
1328 dasd_eckd_compare_path_uid(
1329 device, &path_private)) {
1330 uid = &path_private.uid;
1331 if (strlen(uid->vduit) > 0)
1332 snprintf(print_uid, sizeof(print_uid),
1333 "%s.%s.%04x.%02x.%s",
1334 uid->vendor, uid->serial,
1335 uid->ssid, uid->real_unit_addr,
1336 uid->vduit);
1337 else
1338 snprintf(print_uid, sizeof(print_uid),
1339 "%s.%s.%04x.%02x",
1340 uid->vendor, uid->serial,
1341 uid->ssid,
1342 uid->real_unit_addr);
1343 dev_err(&device->cdev->dev,
1344 "The newly added channel path %02X "
1345 "will not be used because it leads "
1346 "to a different device %s\n",
1347 lpm, print_uid);
1348 opm &= ~lpm;
1349 npm &= ~lpm;
1350 ppm &= ~lpm;
1351 continue;
1352 }
1353 }
1354
1355 /*
1356 * There is a small chance that a path is lost again between
1357 * above path verification and the following modification of
1358 * the device opm mask. We could avoid that race here by using
1359 * yet another path mask, but we rather deal with this unlikely
1360 * situation in dasd_start_IO.
1361 */
1362 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1363 if (!device->path_data.opm && opm) {
1364 device->path_data.opm = opm;
1365 dasd_generic_path_operational(device);
1366 } else
1367 device->path_data.opm |= opm;
1368 device->path_data.npm |= npm;
1369 device->path_data.ppm |= ppm;
1370 device->path_data.tbvpm |= epm;
1371 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1372 }
1373
1374 dasd_put_device(device);
1375 if (data->isglobal)
1376 mutex_unlock(&dasd_path_verification_mutex);
1377 else
1378 kfree(data);
1379 }
1380
1381 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1382 {
1383 struct path_verification_work_data *data;
1384
1385 data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1386 if (!data) {
1387 if (mutex_trylock(&dasd_path_verification_mutex)) {
1388 data = path_verification_worker;
1389 data->isglobal = 1;
1390 } else
1391 return -ENOMEM;
1392 } else {
1393 memset(data, 0, sizeof(*data));
1394 data->isglobal = 0;
1395 }
1396 INIT_WORK(&data->worker, do_path_verification_work);
1397 dasd_get_device(device);
1398 data->device = device;
1399 data->tbvpm = lpm;
1400 schedule_work(&data->worker);
1401 return 0;
1402 }
1403
1404 static int dasd_eckd_read_features(struct dasd_device *device)
1405 {
1406 struct dasd_psf_prssd_data *prssdp;
1407 struct dasd_rssd_features *features;
1408 struct dasd_ccw_req *cqr;
1409 struct ccw1 *ccw;
1410 int rc;
1411 struct dasd_eckd_private *private;
1412
1413 private = (struct dasd_eckd_private *) device->private;
1414 memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1415 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1416 (sizeof(struct dasd_psf_prssd_data) +
1417 sizeof(struct dasd_rssd_features)),
1418 device);
1419 if (IS_ERR(cqr)) {
1420 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1421 "allocate initialization request");
1422 return PTR_ERR(cqr);
1423 }
1424 cqr->startdev = device;
1425 cqr->memdev = device;
1426 cqr->block = NULL;
1427 cqr->retries = 256;
1428 cqr->expires = 10 * HZ;
1429
1430 /* Prepare for Read Subsystem Data */
1431 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1432 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1433 prssdp->order = PSF_ORDER_PRSSD;
1434 prssdp->suborder = 0x41; /* Read Feature Codes */
1435 /* all other bytes of prssdp must be zero */
1436
1437 ccw = cqr->cpaddr;
1438 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1439 ccw->count = sizeof(struct dasd_psf_prssd_data);
1440 ccw->flags |= CCW_FLAG_CC;
1441 ccw->cda = (__u32)(addr_t) prssdp;
1442
1443 /* Read Subsystem Data - feature codes */
1444 features = (struct dasd_rssd_features *) (prssdp + 1);
1445 memset(features, 0, sizeof(struct dasd_rssd_features));
1446
1447 ccw++;
1448 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1449 ccw->count = sizeof(struct dasd_rssd_features);
1450 ccw->cda = (__u32)(addr_t) features;
1451
1452 cqr->buildclk = get_tod_clock();
1453 cqr->status = DASD_CQR_FILLED;
1454 rc = dasd_sleep_on(cqr);
1455 if (rc == 0) {
1456 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1457 features = (struct dasd_rssd_features *) (prssdp + 1);
1458 memcpy(&private->features, features,
1459 sizeof(struct dasd_rssd_features));
1460 } else
1461 dev_warn(&device->cdev->dev, "Reading device feature codes"
1462 " failed with rc=%d\n", rc);
1463 dasd_sfree_request(cqr, cqr->memdev);
1464 return rc;
1465 }
1466
1467
1468 /*
1469 * Build CP for Perform Subsystem Function - SSC.
1470 */
1471 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1472 int enable_pav)
1473 {
1474 struct dasd_ccw_req *cqr;
1475 struct dasd_psf_ssc_data *psf_ssc_data;
1476 struct ccw1 *ccw;
1477
1478 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1479 sizeof(struct dasd_psf_ssc_data),
1480 device);
1481
1482 if (IS_ERR(cqr)) {
1483 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1484 "Could not allocate PSF-SSC request");
1485 return cqr;
1486 }
1487 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1488 psf_ssc_data->order = PSF_ORDER_SSC;
1489 psf_ssc_data->suborder = 0xc0;
1490 if (enable_pav) {
1491 psf_ssc_data->suborder |= 0x08;
1492 psf_ssc_data->reserved[0] = 0x88;
1493 }
1494 ccw = cqr->cpaddr;
1495 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1496 ccw->cda = (__u32)(addr_t)psf_ssc_data;
1497 ccw->count = 66;
1498
1499 cqr->startdev = device;
1500 cqr->memdev = device;
1501 cqr->block = NULL;
1502 cqr->retries = 256;
1503 cqr->expires = 10*HZ;
1504 cqr->buildclk = get_tod_clock();
1505 cqr->status = DASD_CQR_FILLED;
1506 return cqr;
1507 }
1508
1509 /*
1510 * Perform Subsystem Function.
1511 * It is necessary to trigger CIO for channel revalidation since this
1512 * call might change behaviour of DASD devices.
1513 */
1514 static int
1515 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1516 unsigned long flags)
1517 {
1518 struct dasd_ccw_req *cqr;
1519 int rc;
1520
1521 cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1522 if (IS_ERR(cqr))
1523 return PTR_ERR(cqr);
1524
1525 /*
1526 * set flags e.g. turn on failfast, to prevent blocking
1527 * the calling function should handle failed requests
1528 */
1529 cqr->flags |= flags;
1530
1531 rc = dasd_sleep_on(cqr);
1532 if (!rc)
1533 /* trigger CIO to reprobe devices */
1534 css_schedule_reprobe();
1535 else if (cqr->intrc == -EAGAIN)
1536 rc = -EAGAIN;
1537
1538 dasd_sfree_request(cqr, cqr->memdev);
1539 return rc;
1540 }
1541
1542 /*
1543 * Valide storage server of current device.
1544 */
1545 static int dasd_eckd_validate_server(struct dasd_device *device,
1546 unsigned long flags)
1547 {
1548 int rc;
1549 struct dasd_eckd_private *private;
1550 int enable_pav;
1551
1552 private = (struct dasd_eckd_private *) device->private;
1553 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1554 private->uid.type == UA_HYPER_PAV_ALIAS)
1555 return 0;
1556 if (dasd_nopav || MACHINE_IS_VM)
1557 enable_pav = 0;
1558 else
1559 enable_pav = 1;
1560 rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1561
1562 /* may be requested feature is not available on server,
1563 * therefore just report error and go ahead */
1564 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1565 "returned rc=%d", private->uid.ssid, rc);
1566 return rc;
1567 }
1568
1569 /*
1570 * worker to do a validate server in case of a lost pathgroup
1571 */
1572 static void dasd_eckd_do_validate_server(struct work_struct *work)
1573 {
1574 struct dasd_device *device = container_of(work, struct dasd_device,
1575 kick_validate);
1576 unsigned long flags = 0;
1577
1578 set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1579 if (dasd_eckd_validate_server(device, flags)
1580 == -EAGAIN) {
1581 /* schedule worker again if failed */
1582 schedule_work(&device->kick_validate);
1583 return;
1584 }
1585
1586 dasd_put_device(device);
1587 }
1588
1589 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1590 {
1591 dasd_get_device(device);
1592 /* exit if device not online or in offline processing */
1593 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1594 device->state < DASD_STATE_ONLINE) {
1595 dasd_put_device(device);
1596 return;
1597 }
1598 /* queue call to do_validate_server to the kernel event daemon. */
1599 schedule_work(&device->kick_validate);
1600 }
1601
1602 static u32 get_fcx_max_data(struct dasd_device *device)
1603 {
1604 #if defined(CONFIG_64BIT)
1605 int tpm, mdc;
1606 int fcx_in_css, fcx_in_gneq, fcx_in_features;
1607 struct dasd_eckd_private *private;
1608
1609 if (dasd_nofcx)
1610 return 0;
1611 /* is transport mode supported? */
1612 private = (struct dasd_eckd_private *) device->private;
1613 fcx_in_css = css_general_characteristics.fcx;
1614 fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1615 fcx_in_features = private->features.feature[40] & 0x80;
1616 tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1617
1618 if (!tpm)
1619 return 0;
1620
1621 mdc = ccw_device_get_mdc(device->cdev, 0);
1622 if (mdc < 0) {
1623 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1624 " data size for zHPF requests failed\n");
1625 return 0;
1626 } else
1627 return mdc * FCX_MAX_DATA_FACTOR;
1628 #else
1629 return 0;
1630 #endif
1631 }
1632
1633 /*
1634 * Check device characteristics.
1635 * If the device is accessible using ECKD discipline, the device is enabled.
1636 */
1637 static int
1638 dasd_eckd_check_characteristics(struct dasd_device *device)
1639 {
1640 struct dasd_eckd_private *private;
1641 struct dasd_block *block;
1642 struct dasd_uid temp_uid;
1643 int rc, i;
1644 int readonly;
1645 unsigned long value;
1646
1647 /* setup work queue for validate server*/
1648 INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1649
1650 if (!ccw_device_is_pathgroup(device->cdev)) {
1651 dev_warn(&device->cdev->dev,
1652 "A channel path group could not be established\n");
1653 return -EIO;
1654 }
1655 if (!ccw_device_is_multipath(device->cdev)) {
1656 dev_info(&device->cdev->dev,
1657 "The DASD is not operating in multipath mode\n");
1658 }
1659 private = (struct dasd_eckd_private *) device->private;
1660 if (!private) {
1661 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1662 if (!private) {
1663 dev_warn(&device->cdev->dev,
1664 "Allocating memory for private DASD data "
1665 "failed\n");
1666 return -ENOMEM;
1667 }
1668 device->private = (void *) private;
1669 } else {
1670 memset(private, 0, sizeof(*private));
1671 }
1672 /* Invalidate status of initial analysis. */
1673 private->init_cqr_status = -1;
1674 /* Set default cache operations. */
1675 private->attrib.operation = DASD_NORMAL_CACHE;
1676 private->attrib.nr_cyl = 0;
1677
1678 /* Read Configuration Data */
1679 rc = dasd_eckd_read_conf(device);
1680 if (rc)
1681 goto out_err1;
1682
1683 /* set default timeout */
1684 device->default_expires = DASD_EXPIRES;
1685 if (private->gneq) {
1686 value = 1;
1687 for (i = 0; i < private->gneq->timeout.value; i++)
1688 value = 10 * value;
1689 value = value * private->gneq->timeout.number;
1690 /* do not accept useless values */
1691 if (value != 0 && value <= DASD_EXPIRES_MAX)
1692 device->default_expires = value;
1693 }
1694
1695 dasd_eckd_get_uid(device, &temp_uid);
1696 if (temp_uid.type == UA_BASE_DEVICE) {
1697 block = dasd_alloc_block();
1698 if (IS_ERR(block)) {
1699 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1700 "could not allocate dasd "
1701 "block structure");
1702 rc = PTR_ERR(block);
1703 goto out_err1;
1704 }
1705 device->block = block;
1706 block->base = device;
1707 }
1708
1709 /* register lcu with alias handling, enable PAV */
1710 rc = dasd_alias_make_device_known_to_lcu(device);
1711 if (rc)
1712 goto out_err2;
1713
1714 dasd_eckd_validate_server(device, 0);
1715
1716 /* device may report different configuration data after LCU setup */
1717 rc = dasd_eckd_read_conf(device);
1718 if (rc)
1719 goto out_err3;
1720
1721 /* Read Feature Codes */
1722 dasd_eckd_read_features(device);
1723
1724 /* Read Device Characteristics */
1725 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1726 &private->rdc_data, 64);
1727 if (rc) {
1728 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1729 "Read device characteristic failed, rc=%d", rc);
1730 goto out_err3;
1731 }
1732
1733 if ((device->features & DASD_FEATURE_USERAW) &&
1734 !(private->rdc_data.facilities.RT_in_LR)) {
1735 dev_err(&device->cdev->dev, "The storage server does not "
1736 "support raw-track access\n");
1737 rc = -EINVAL;
1738 goto out_err3;
1739 }
1740
1741 /* find the valid cylinder size */
1742 if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1743 private->rdc_data.long_no_cyl)
1744 private->real_cyl = private->rdc_data.long_no_cyl;
1745 else
1746 private->real_cyl = private->rdc_data.no_cyl;
1747
1748 private->fcx_max_data = get_fcx_max_data(device);
1749
1750 readonly = dasd_device_is_ro(device);
1751 if (readonly)
1752 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1753
1754 dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1755 "with %d cylinders, %d heads, %d sectors%s\n",
1756 private->rdc_data.dev_type,
1757 private->rdc_data.dev_model,
1758 private->rdc_data.cu_type,
1759 private->rdc_data.cu_model.model,
1760 private->real_cyl,
1761 private->rdc_data.trk_per_cyl,
1762 private->rdc_data.sec_per_trk,
1763 readonly ? ", read-only device" : "");
1764 return 0;
1765
1766 out_err3:
1767 dasd_alias_disconnect_device_from_lcu(device);
1768 out_err2:
1769 dasd_free_block(device->block);
1770 device->block = NULL;
1771 out_err1:
1772 kfree(private->conf_data);
1773 kfree(device->private);
1774 device->private = NULL;
1775 return rc;
1776 }
1777
1778 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1779 {
1780 struct dasd_eckd_private *private;
1781
1782 private = (struct dasd_eckd_private *) device->private;
1783 dasd_alias_disconnect_device_from_lcu(device);
1784 private->ned = NULL;
1785 private->sneq = NULL;
1786 private->vdsneq = NULL;
1787 private->gneq = NULL;
1788 private->conf_len = 0;
1789 kfree(private->conf_data);
1790 private->conf_data = NULL;
1791 }
1792
1793 static struct dasd_ccw_req *
1794 dasd_eckd_analysis_ccw(struct dasd_device *device)
1795 {
1796 struct dasd_eckd_private *private;
1797 struct eckd_count *count_data;
1798 struct LO_eckd_data *LO_data;
1799 struct dasd_ccw_req *cqr;
1800 struct ccw1 *ccw;
1801 int cplength, datasize;
1802 int i;
1803
1804 private = (struct dasd_eckd_private *) device->private;
1805
1806 cplength = 8;
1807 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1808 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1809 if (IS_ERR(cqr))
1810 return cqr;
1811 ccw = cqr->cpaddr;
1812 /* Define extent for the first 3 tracks. */
1813 define_extent(ccw++, cqr->data, 0, 2,
1814 DASD_ECKD_CCW_READ_COUNT, device);
1815 LO_data = cqr->data + sizeof(struct DE_eckd_data);
1816 /* Locate record for the first 4 records on track 0. */
1817 ccw[-1].flags |= CCW_FLAG_CC;
1818 locate_record(ccw++, LO_data++, 0, 0, 4,
1819 DASD_ECKD_CCW_READ_COUNT, device, 0);
1820
1821 count_data = private->count_area;
1822 for (i = 0; i < 4; i++) {
1823 ccw[-1].flags |= CCW_FLAG_CC;
1824 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1825 ccw->flags = 0;
1826 ccw->count = 8;
1827 ccw->cda = (__u32)(addr_t) count_data;
1828 ccw++;
1829 count_data++;
1830 }
1831
1832 /* Locate record for the first record on track 2. */
1833 ccw[-1].flags |= CCW_FLAG_CC;
1834 locate_record(ccw++, LO_data++, 2, 0, 1,
1835 DASD_ECKD_CCW_READ_COUNT, device, 0);
1836 /* Read count ccw. */
1837 ccw[-1].flags |= CCW_FLAG_CC;
1838 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1839 ccw->flags = 0;
1840 ccw->count = 8;
1841 ccw->cda = (__u32)(addr_t) count_data;
1842
1843 cqr->block = NULL;
1844 cqr->startdev = device;
1845 cqr->memdev = device;
1846 cqr->retries = 255;
1847 cqr->buildclk = get_tod_clock();
1848 cqr->status = DASD_CQR_FILLED;
1849 return cqr;
1850 }
1851
1852 /* differentiate between 'no record found' and any other error */
1853 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1854 {
1855 char *sense;
1856 if (init_cqr->status == DASD_CQR_DONE)
1857 return INIT_CQR_OK;
1858 else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1859 init_cqr->status == DASD_CQR_FAILED) {
1860 sense = dasd_get_sense(&init_cqr->irb);
1861 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1862 return INIT_CQR_UNFORMATTED;
1863 else
1864 return INIT_CQR_ERROR;
1865 } else
1866 return INIT_CQR_ERROR;
1867 }
1868
1869 /*
1870 * This is the callback function for the init_analysis cqr. It saves
1871 * the status of the initial analysis ccw before it frees it and kicks
1872 * the device to continue the startup sequence. This will call
1873 * dasd_eckd_do_analysis again (if the devices has not been marked
1874 * for deletion in the meantime).
1875 */
1876 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1877 void *data)
1878 {
1879 struct dasd_eckd_private *private;
1880 struct dasd_device *device;
1881
1882 device = init_cqr->startdev;
1883 private = (struct dasd_eckd_private *) device->private;
1884 private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1885 dasd_sfree_request(init_cqr, device);
1886 dasd_kick_device(device);
1887 }
1888
1889 static int dasd_eckd_start_analysis(struct dasd_block *block)
1890 {
1891 struct dasd_ccw_req *init_cqr;
1892
1893 init_cqr = dasd_eckd_analysis_ccw(block->base);
1894 if (IS_ERR(init_cqr))
1895 return PTR_ERR(init_cqr);
1896 init_cqr->callback = dasd_eckd_analysis_callback;
1897 init_cqr->callback_data = NULL;
1898 init_cqr->expires = 5*HZ;
1899 /* first try without ERP, so we can later handle unformatted
1900 * devices as special case
1901 */
1902 clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1903 init_cqr->retries = 0;
1904 dasd_add_request_head(init_cqr);
1905 return -EAGAIN;
1906 }
1907
1908 static int dasd_eckd_end_analysis(struct dasd_block *block)
1909 {
1910 struct dasd_device *device;
1911 struct dasd_eckd_private *private;
1912 struct eckd_count *count_area;
1913 unsigned int sb, blk_per_trk;
1914 int status, i;
1915 struct dasd_ccw_req *init_cqr;
1916
1917 device = block->base;
1918 private = (struct dasd_eckd_private *) device->private;
1919 status = private->init_cqr_status;
1920 private->init_cqr_status = -1;
1921 if (status == INIT_CQR_ERROR) {
1922 /* try again, this time with full ERP */
1923 init_cqr = dasd_eckd_analysis_ccw(device);
1924 dasd_sleep_on(init_cqr);
1925 status = dasd_eckd_analysis_evaluation(init_cqr);
1926 dasd_sfree_request(init_cqr, device);
1927 }
1928
1929 if (device->features & DASD_FEATURE_USERAW) {
1930 block->bp_block = DASD_RAW_BLOCKSIZE;
1931 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1932 block->s2b_shift = 3;
1933 goto raw;
1934 }
1935
1936 if (status == INIT_CQR_UNFORMATTED) {
1937 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1938 return -EMEDIUMTYPE;
1939 } else if (status == INIT_CQR_ERROR) {
1940 dev_err(&device->cdev->dev,
1941 "Detecting the DASD disk layout failed because "
1942 "of an I/O error\n");
1943 return -EIO;
1944 }
1945
1946 private->uses_cdl = 1;
1947 /* Check Track 0 for Compatible Disk Layout */
1948 count_area = NULL;
1949 for (i = 0; i < 3; i++) {
1950 if (private->count_area[i].kl != 4 ||
1951 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1952 private->count_area[i].cyl != 0 ||
1953 private->count_area[i].head != count_area_head[i] ||
1954 private->count_area[i].record != count_area_rec[i]) {
1955 private->uses_cdl = 0;
1956 break;
1957 }
1958 }
1959 if (i == 3)
1960 count_area = &private->count_area[4];
1961
1962 if (private->uses_cdl == 0) {
1963 for (i = 0; i < 5; i++) {
1964 if ((private->count_area[i].kl != 0) ||
1965 (private->count_area[i].dl !=
1966 private->count_area[0].dl) ||
1967 private->count_area[i].cyl != 0 ||
1968 private->count_area[i].head != count_area_head[i] ||
1969 private->count_area[i].record != count_area_rec[i])
1970 break;
1971 }
1972 if (i == 5)
1973 count_area = &private->count_area[0];
1974 } else {
1975 if (private->count_area[3].record == 1)
1976 dev_warn(&device->cdev->dev,
1977 "Track 0 has no records following the VTOC\n");
1978 }
1979
1980 if (count_area != NULL && count_area->kl == 0) {
1981 /* we found notthing violating our disk layout */
1982 if (dasd_check_blocksize(count_area->dl) == 0)
1983 block->bp_block = count_area->dl;
1984 }
1985 if (block->bp_block == 0) {
1986 dev_warn(&device->cdev->dev,
1987 "The disk layout of the DASD is not supported\n");
1988 return -EMEDIUMTYPE;
1989 }
1990 block->s2b_shift = 0; /* bits to shift 512 to get a block */
1991 for (sb = 512; sb < block->bp_block; sb = sb << 1)
1992 block->s2b_shift++;
1993
1994 blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1995
1996 raw:
1997 block->blocks = (private->real_cyl *
1998 private->rdc_data.trk_per_cyl *
1999 blk_per_trk);
2000
2001 dev_info(&device->cdev->dev,
2002 "DASD with %d KB/block, %d KB total size, %d KB/track, "
2003 "%s\n", (block->bp_block >> 10),
2004 ((private->real_cyl *
2005 private->rdc_data.trk_per_cyl *
2006 blk_per_trk * (block->bp_block >> 9)) >> 1),
2007 ((blk_per_trk * block->bp_block) >> 10),
2008 private->uses_cdl ?
2009 "compatible disk layout" : "linux disk layout");
2010
2011 return 0;
2012 }
2013
2014 static int dasd_eckd_do_analysis(struct dasd_block *block)
2015 {
2016 struct dasd_eckd_private *private;
2017
2018 private = (struct dasd_eckd_private *) block->base->private;
2019 if (private->init_cqr_status < 0)
2020 return dasd_eckd_start_analysis(block);
2021 else
2022 return dasd_eckd_end_analysis(block);
2023 }
2024
2025 static int dasd_eckd_ready_to_online(struct dasd_device *device)
2026 {
2027 return dasd_alias_add_device(device);
2028 };
2029
2030 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2031 {
2032 cancel_work_sync(&device->reload_device);
2033 cancel_work_sync(&device->kick_validate);
2034 return dasd_alias_remove_device(device);
2035 };
2036
2037 static int
2038 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2039 {
2040 struct dasd_eckd_private *private;
2041
2042 private = (struct dasd_eckd_private *) block->base->private;
2043 if (dasd_check_blocksize(block->bp_block) == 0) {
2044 geo->sectors = recs_per_track(&private->rdc_data,
2045 0, block->bp_block);
2046 }
2047 geo->cylinders = private->rdc_data.no_cyl;
2048 geo->heads = private->rdc_data.trk_per_cyl;
2049 return 0;
2050 }
2051
2052 static struct dasd_ccw_req *
2053 dasd_eckd_format_device(struct dasd_device * device,
2054 struct format_data_t * fdata)
2055 {
2056 struct dasd_eckd_private *private;
2057 struct dasd_ccw_req *fcp;
2058 struct eckd_count *ect;
2059 struct ccw1 *ccw;
2060 void *data;
2061 int rpt;
2062 struct ch_t address;
2063 int cplength, datasize;
2064 int i;
2065 int intensity = 0;
2066 int r0_perm;
2067
2068 private = (struct dasd_eckd_private *) device->private;
2069 rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
2070 set_ch_t(&address,
2071 fdata->start_unit / private->rdc_data.trk_per_cyl,
2072 fdata->start_unit % private->rdc_data.trk_per_cyl);
2073
2074 /* Sanity checks. */
2075 if (fdata->start_unit >=
2076 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2077 dev_warn(&device->cdev->dev, "Start track number %d used in "
2078 "formatting is too big\n", fdata->start_unit);
2079 return ERR_PTR(-EINVAL);
2080 }
2081 if (fdata->start_unit > fdata->stop_unit) {
2082 dev_warn(&device->cdev->dev, "Start track %d used in "
2083 "formatting exceeds end track\n", fdata->start_unit);
2084 return ERR_PTR(-EINVAL);
2085 }
2086 if (dasd_check_blocksize(fdata->blksize) != 0) {
2087 dev_warn(&device->cdev->dev,
2088 "The DASD cannot be formatted with block size %d\n",
2089 fdata->blksize);
2090 return ERR_PTR(-EINVAL);
2091 }
2092
2093 /*
2094 * fdata->intensity is a bit string that tells us what to do:
2095 * Bit 0: write record zero
2096 * Bit 1: write home address, currently not supported
2097 * Bit 2: invalidate tracks
2098 * Bit 3: use OS/390 compatible disk layout (cdl)
2099 * Bit 4: do not allow storage subsystem to modify record zero
2100 * Only some bit combinations do make sense.
2101 */
2102 if (fdata->intensity & 0x10) {
2103 r0_perm = 0;
2104 intensity = fdata->intensity & ~0x10;
2105 } else {
2106 r0_perm = 1;
2107 intensity = fdata->intensity;
2108 }
2109 switch (intensity) {
2110 case 0x00: /* Normal format */
2111 case 0x08: /* Normal format, use cdl. */
2112 cplength = 2 + rpt;
2113 datasize = sizeof(struct DE_eckd_data) +
2114 sizeof(struct LO_eckd_data) +
2115 rpt * sizeof(struct eckd_count);
2116 break;
2117 case 0x01: /* Write record zero and format track. */
2118 case 0x09: /* Write record zero and format track, use cdl. */
2119 cplength = 3 + rpt;
2120 datasize = sizeof(struct DE_eckd_data) +
2121 sizeof(struct LO_eckd_data) +
2122 sizeof(struct eckd_count) +
2123 rpt * sizeof(struct eckd_count);
2124 break;
2125 case 0x04: /* Invalidate track. */
2126 case 0x0c: /* Invalidate track, use cdl. */
2127 cplength = 3;
2128 datasize = sizeof(struct DE_eckd_data) +
2129 sizeof(struct LO_eckd_data) +
2130 sizeof(struct eckd_count);
2131 break;
2132 default:
2133 dev_warn(&device->cdev->dev, "An I/O control call used "
2134 "incorrect flags 0x%x\n", fdata->intensity);
2135 return ERR_PTR(-EINVAL);
2136 }
2137 /* Allocate the format ccw request. */
2138 fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
2139 if (IS_ERR(fcp))
2140 return fcp;
2141
2142 data = fcp->data;
2143 ccw = fcp->cpaddr;
2144
2145 switch (intensity & ~0x08) {
2146 case 0x00: /* Normal format. */
2147 define_extent(ccw++, (struct DE_eckd_data *) data,
2148 fdata->start_unit, fdata->start_unit,
2149 DASD_ECKD_CCW_WRITE_CKD, device);
2150 /* grant subsystem permission to format R0 */
2151 if (r0_perm)
2152 ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
2153 data += sizeof(struct DE_eckd_data);
2154 ccw[-1].flags |= CCW_FLAG_CC;
2155 locate_record(ccw++, (struct LO_eckd_data *) data,
2156 fdata->start_unit, 0, rpt,
2157 DASD_ECKD_CCW_WRITE_CKD, device,
2158 fdata->blksize);
2159 data += sizeof(struct LO_eckd_data);
2160 break;
2161 case 0x01: /* Write record zero + format track. */
2162 define_extent(ccw++, (struct DE_eckd_data *) data,
2163 fdata->start_unit, fdata->start_unit,
2164 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2165 device);
2166 data += sizeof(struct DE_eckd_data);
2167 ccw[-1].flags |= CCW_FLAG_CC;
2168 locate_record(ccw++, (struct LO_eckd_data *) data,
2169 fdata->start_unit, 0, rpt + 1,
2170 DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
2171 device->block->bp_block);
2172 data += sizeof(struct LO_eckd_data);
2173 break;
2174 case 0x04: /* Invalidate track. */
2175 define_extent(ccw++, (struct DE_eckd_data *) data,
2176 fdata->start_unit, fdata->start_unit,
2177 DASD_ECKD_CCW_WRITE_CKD, device);
2178 data += sizeof(struct DE_eckd_data);
2179 ccw[-1].flags |= CCW_FLAG_CC;
2180 locate_record(ccw++, (struct LO_eckd_data *) data,
2181 fdata->start_unit, 0, 1,
2182 DASD_ECKD_CCW_WRITE_CKD, device, 8);
2183 data += sizeof(struct LO_eckd_data);
2184 break;
2185 }
2186 if (intensity & 0x01) { /* write record zero */
2187 ect = (struct eckd_count *) data;
2188 data += sizeof(struct eckd_count);
2189 ect->cyl = address.cyl;
2190 ect->head = address.head;
2191 ect->record = 0;
2192 ect->kl = 0;
2193 ect->dl = 8;
2194 ccw[-1].flags |= CCW_FLAG_CC;
2195 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2196 ccw->flags = CCW_FLAG_SLI;
2197 ccw->count = 8;
2198 ccw->cda = (__u32)(addr_t) ect;
2199 ccw++;
2200 }
2201 if ((intensity & ~0x08) & 0x04) { /* erase track */
2202 ect = (struct eckd_count *) data;
2203 data += sizeof(struct eckd_count);
2204 ect->cyl = address.cyl;
2205 ect->head = address.head;
2206 ect->record = 1;
2207 ect->kl = 0;
2208 ect->dl = 0;
2209 ccw[-1].flags |= CCW_FLAG_CC;
2210 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2211 ccw->flags = CCW_FLAG_SLI;
2212 ccw->count = 8;
2213 ccw->cda = (__u32)(addr_t) ect;
2214 } else { /* write remaining records */
2215 for (i = 0; i < rpt; i++) {
2216 ect = (struct eckd_count *) data;
2217 data += sizeof(struct eckd_count);
2218 ect->cyl = address.cyl;
2219 ect->head = address.head;
2220 ect->record = i + 1;
2221 ect->kl = 0;
2222 ect->dl = fdata->blksize;
2223 /* Check for special tracks 0-1 when formatting CDL */
2224 if ((intensity & 0x08) &&
2225 fdata->start_unit == 0) {
2226 if (i < 3) {
2227 ect->kl = 4;
2228 ect->dl = sizes_trk0[i] - 4;
2229 }
2230 }
2231 if ((intensity & 0x08) &&
2232 fdata->start_unit == 1) {
2233 ect->kl = 44;
2234 ect->dl = LABEL_SIZE - 44;
2235 }
2236 ccw[-1].flags |= CCW_FLAG_CC;
2237 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2238 ccw->flags = CCW_FLAG_SLI;
2239 ccw->count = 8;
2240 ccw->cda = (__u32)(addr_t) ect;
2241 ccw++;
2242 }
2243 }
2244 fcp->startdev = device;
2245 fcp->memdev = device;
2246 fcp->retries = 256;
2247 fcp->buildclk = get_tod_clock();
2248 fcp->status = DASD_CQR_FILLED;
2249 return fcp;
2250 }
2251
2252 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2253 {
2254 cqr->status = DASD_CQR_FILLED;
2255 if (cqr->block && (cqr->startdev != cqr->block->base)) {
2256 dasd_eckd_reset_ccw_to_base_io(cqr);
2257 cqr->startdev = cqr->block->base;
2258 cqr->lpm = cqr->block->base->path_data.opm;
2259 }
2260 };
2261
2262 static dasd_erp_fn_t
2263 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2264 {
2265 struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2266 struct ccw_device *cdev = device->cdev;
2267
2268 switch (cdev->id.cu_type) {
2269 case 0x3990:
2270 case 0x2105:
2271 case 0x2107:
2272 case 0x1750:
2273 return dasd_3990_erp_action;
2274 case 0x9343:
2275 case 0x3880:
2276 default:
2277 return dasd_default_erp_action;
2278 }
2279 }
2280
2281 static dasd_erp_fn_t
2282 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2283 {
2284 return dasd_default_erp_postaction;
2285 }
2286
2287 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2288 struct dasd_ccw_req *cqr,
2289 struct irb *irb)
2290 {
2291 char mask;
2292 char *sense = NULL;
2293 struct dasd_eckd_private *private;
2294
2295 private = (struct dasd_eckd_private *) device->private;
2296 /* first of all check for state change pending interrupt */
2297 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2298 if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2299 /*
2300 * for alias only, not in offline processing
2301 * and only if not suspended
2302 */
2303 if (!device->block && private->lcu &&
2304 device->state == DASD_STATE_ONLINE &&
2305 !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2306 !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2307 /*
2308 * the state change could be caused by an alias
2309 * reassignment remove device from alias handling
2310 * to prevent new requests from being scheduled on
2311 * the wrong alias device
2312 */
2313 dasd_alias_remove_device(device);
2314
2315 /* schedule worker to reload device */
2316 dasd_reload_device(device);
2317 }
2318 dasd_generic_handle_state_change(device);
2319 return;
2320 }
2321
2322 sense = dasd_get_sense(irb);
2323 if (!sense)
2324 return;
2325
2326 /* summary unit check */
2327 if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2328 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2329 dasd_alias_handle_summary_unit_check(device, irb);
2330 return;
2331 }
2332
2333 /* service information message SIM */
2334 if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2335 ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2336 dasd_3990_erp_handle_sim(device, sense);
2337 return;
2338 }
2339
2340 /* loss of device reservation is handled via base devices only
2341 * as alias devices may be used with several bases
2342 */
2343 if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2344 (sense[7] == 0x3F) &&
2345 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2346 test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2347 if (device->features & DASD_FEATURE_FAILONSLCK)
2348 set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2349 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2350 dev_err(&device->cdev->dev,
2351 "The device reservation was lost\n");
2352 }
2353 }
2354
2355 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2356 struct dasd_device *startdev,
2357 struct dasd_block *block,
2358 struct request *req,
2359 sector_t first_rec,
2360 sector_t last_rec,
2361 sector_t first_trk,
2362 sector_t last_trk,
2363 unsigned int first_offs,
2364 unsigned int last_offs,
2365 unsigned int blk_per_trk,
2366 unsigned int blksize)
2367 {
2368 struct dasd_eckd_private *private;
2369 unsigned long *idaws;
2370 struct LO_eckd_data *LO_data;
2371 struct dasd_ccw_req *cqr;
2372 struct ccw1 *ccw;
2373 struct req_iterator iter;
2374 struct bio_vec *bv;
2375 char *dst;
2376 unsigned int off;
2377 int count, cidaw, cplength, datasize;
2378 sector_t recid;
2379 unsigned char cmd, rcmd;
2380 int use_prefix;
2381 struct dasd_device *basedev;
2382
2383 basedev = block->base;
2384 private = (struct dasd_eckd_private *) basedev->private;
2385 if (rq_data_dir(req) == READ)
2386 cmd = DASD_ECKD_CCW_READ_MT;
2387 else if (rq_data_dir(req) == WRITE)
2388 cmd = DASD_ECKD_CCW_WRITE_MT;
2389 else
2390 return ERR_PTR(-EINVAL);
2391
2392 /* Check struct bio and count the number of blocks for the request. */
2393 count = 0;
2394 cidaw = 0;
2395 rq_for_each_segment(bv, req, iter) {
2396 if (bv->bv_len & (blksize - 1))
2397 /* Eckd can only do full blocks. */
2398 return ERR_PTR(-EINVAL);
2399 count += bv->bv_len >> (block->s2b_shift + 9);
2400 #if defined(CONFIG_64BIT)
2401 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2402 cidaw += bv->bv_len >> (block->s2b_shift + 9);
2403 #endif
2404 }
2405 /* Paranoia. */
2406 if (count != last_rec - first_rec + 1)
2407 return ERR_PTR(-EINVAL);
2408
2409 /* use the prefix command if available */
2410 use_prefix = private->features.feature[8] & 0x01;
2411 if (use_prefix) {
2412 /* 1x prefix + number of blocks */
2413 cplength = 2 + count;
2414 /* 1x prefix + cidaws*sizeof(long) */
2415 datasize = sizeof(struct PFX_eckd_data) +
2416 sizeof(struct LO_eckd_data) +
2417 cidaw * sizeof(unsigned long);
2418 } else {
2419 /* 1x define extent + 1x locate record + number of blocks */
2420 cplength = 2 + count;
2421 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2422 datasize = sizeof(struct DE_eckd_data) +
2423 sizeof(struct LO_eckd_data) +
2424 cidaw * sizeof(unsigned long);
2425 }
2426 /* Find out the number of additional locate record ccws for cdl. */
2427 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2428 if (last_rec >= 2*blk_per_trk)
2429 count = 2*blk_per_trk - first_rec;
2430 cplength += count;
2431 datasize += count*sizeof(struct LO_eckd_data);
2432 }
2433 /* Allocate the ccw request. */
2434 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2435 startdev);
2436 if (IS_ERR(cqr))
2437 return cqr;
2438 ccw = cqr->cpaddr;
2439 /* First ccw is define extent or prefix. */
2440 if (use_prefix) {
2441 if (prefix(ccw++, cqr->data, first_trk,
2442 last_trk, cmd, basedev, startdev) == -EAGAIN) {
2443 /* Clock not in sync and XRC is enabled.
2444 * Try again later.
2445 */
2446 dasd_sfree_request(cqr, startdev);
2447 return ERR_PTR(-EAGAIN);
2448 }
2449 idaws = (unsigned long *) (cqr->data +
2450 sizeof(struct PFX_eckd_data));
2451 } else {
2452 if (define_extent(ccw++, cqr->data, first_trk,
2453 last_trk, cmd, basedev) == -EAGAIN) {
2454 /* Clock not in sync and XRC is enabled.
2455 * Try again later.
2456 */
2457 dasd_sfree_request(cqr, startdev);
2458 return ERR_PTR(-EAGAIN);
2459 }
2460 idaws = (unsigned long *) (cqr->data +
2461 sizeof(struct DE_eckd_data));
2462 }
2463 /* Build locate_record+read/write/ccws. */
2464 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2465 recid = first_rec;
2466 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2467 /* Only standard blocks so there is just one locate record. */
2468 ccw[-1].flags |= CCW_FLAG_CC;
2469 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2470 last_rec - recid + 1, cmd, basedev, blksize);
2471 }
2472 rq_for_each_segment(bv, req, iter) {
2473 dst = page_address(bv->bv_page) + bv->bv_offset;
2474 if (dasd_page_cache) {
2475 char *copy = kmem_cache_alloc(dasd_page_cache,
2476 GFP_DMA | __GFP_NOWARN);
2477 if (copy && rq_data_dir(req) == WRITE)
2478 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2479 if (copy)
2480 dst = copy + bv->bv_offset;
2481 }
2482 for (off = 0; off < bv->bv_len; off += blksize) {
2483 sector_t trkid = recid;
2484 unsigned int recoffs = sector_div(trkid, blk_per_trk);
2485 rcmd = cmd;
2486 count = blksize;
2487 /* Locate record for cdl special block ? */
2488 if (private->uses_cdl && recid < 2*blk_per_trk) {
2489 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2490 rcmd |= 0x8;
2491 count = dasd_eckd_cdl_reclen(recid);
2492 if (count < blksize &&
2493 rq_data_dir(req) == READ)
2494 memset(dst + count, 0xe5,
2495 blksize - count);
2496 }
2497 ccw[-1].flags |= CCW_FLAG_CC;
2498 locate_record(ccw++, LO_data++,
2499 trkid, recoffs + 1,
2500 1, rcmd, basedev, count);
2501 }
2502 /* Locate record for standard blocks ? */
2503 if (private->uses_cdl && recid == 2*blk_per_trk) {
2504 ccw[-1].flags |= CCW_FLAG_CC;
2505 locate_record(ccw++, LO_data++,
2506 trkid, recoffs + 1,
2507 last_rec - recid + 1,
2508 cmd, basedev, count);
2509 }
2510 /* Read/write ccw. */
2511 ccw[-1].flags |= CCW_FLAG_CC;
2512 ccw->cmd_code = rcmd;
2513 ccw->count = count;
2514 if (idal_is_needed(dst, blksize)) {
2515 ccw->cda = (__u32)(addr_t) idaws;
2516 ccw->flags = CCW_FLAG_IDA;
2517 idaws = idal_create_words(idaws, dst, blksize);
2518 } else {
2519 ccw->cda = (__u32)(addr_t) dst;
2520 ccw->flags = 0;
2521 }
2522 ccw++;
2523 dst += blksize;
2524 recid++;
2525 }
2526 }
2527 if (blk_noretry_request(req) ||
2528 block->base->features & DASD_FEATURE_FAILFAST)
2529 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2530 cqr->startdev = startdev;
2531 cqr->memdev = startdev;
2532 cqr->block = block;
2533 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2534 cqr->lpm = startdev->path_data.ppm;
2535 cqr->retries = 256;
2536 cqr->buildclk = get_tod_clock();
2537 cqr->status = DASD_CQR_FILLED;
2538 return cqr;
2539 }
2540
2541 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2542 struct dasd_device *startdev,
2543 struct dasd_block *block,
2544 struct request *req,
2545 sector_t first_rec,
2546 sector_t last_rec,
2547 sector_t first_trk,
2548 sector_t last_trk,
2549 unsigned int first_offs,
2550 unsigned int last_offs,
2551 unsigned int blk_per_trk,
2552 unsigned int blksize)
2553 {
2554 unsigned long *idaws;
2555 struct dasd_ccw_req *cqr;
2556 struct ccw1 *ccw;
2557 struct req_iterator iter;
2558 struct bio_vec *bv;
2559 char *dst, *idaw_dst;
2560 unsigned int cidaw, cplength, datasize;
2561 unsigned int tlf;
2562 sector_t recid;
2563 unsigned char cmd;
2564 struct dasd_device *basedev;
2565 unsigned int trkcount, count, count_to_trk_end;
2566 unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2567 unsigned char new_track, end_idaw;
2568 sector_t trkid;
2569 unsigned int recoffs;
2570
2571 basedev = block->base;
2572 if (rq_data_dir(req) == READ)
2573 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2574 else if (rq_data_dir(req) == WRITE)
2575 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2576 else
2577 return ERR_PTR(-EINVAL);
2578
2579 /* Track based I/O needs IDAWs for each page, and not just for
2580 * 64 bit addresses. We need additional idals for pages
2581 * that get filled from two tracks, so we use the number
2582 * of records as upper limit.
2583 */
2584 cidaw = last_rec - first_rec + 1;
2585 trkcount = last_trk - first_trk + 1;
2586
2587 /* 1x prefix + one read/write ccw per track */
2588 cplength = 1 + trkcount;
2589
2590 /* on 31-bit we need space for two 32 bit addresses per page
2591 * on 64-bit one 64 bit address
2592 */
2593 datasize = sizeof(struct PFX_eckd_data) +
2594 cidaw * sizeof(unsigned long long);
2595
2596 /* Allocate the ccw request. */
2597 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2598 startdev);
2599 if (IS_ERR(cqr))
2600 return cqr;
2601 ccw = cqr->cpaddr;
2602 /* transfer length factor: how many bytes to read from the last track */
2603 if (first_trk == last_trk)
2604 tlf = last_offs - first_offs + 1;
2605 else
2606 tlf = last_offs + 1;
2607 tlf *= blksize;
2608
2609 if (prefix_LRE(ccw++, cqr->data, first_trk,
2610 last_trk, cmd, basedev, startdev,
2611 1 /* format */, first_offs + 1,
2612 trkcount, blksize,
2613 tlf) == -EAGAIN) {
2614 /* Clock not in sync and XRC is enabled.
2615 * Try again later.
2616 */
2617 dasd_sfree_request(cqr, startdev);
2618 return ERR_PTR(-EAGAIN);
2619 }
2620
2621 /*
2622 * The translation of request into ccw programs must meet the
2623 * following conditions:
2624 * - all idaws but the first and the last must address full pages
2625 * (or 2K blocks on 31-bit)
2626 * - the scope of a ccw and it's idal ends with the track boundaries
2627 */
2628 idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2629 recid = first_rec;
2630 new_track = 1;
2631 end_idaw = 0;
2632 len_to_track_end = 0;
2633 idaw_dst = NULL;
2634 idaw_len = 0;
2635 rq_for_each_segment(bv, req, iter) {
2636 dst = page_address(bv->bv_page) + bv->bv_offset;
2637 seg_len = bv->bv_len;
2638 while (seg_len) {
2639 if (new_track) {
2640 trkid = recid;
2641 recoffs = sector_div(trkid, blk_per_trk);
2642 count_to_trk_end = blk_per_trk - recoffs;
2643 count = min((last_rec - recid + 1),
2644 (sector_t)count_to_trk_end);
2645 len_to_track_end = count * blksize;
2646 ccw[-1].flags |= CCW_FLAG_CC;
2647 ccw->cmd_code = cmd;
2648 ccw->count = len_to_track_end;
2649 ccw->cda = (__u32)(addr_t)idaws;
2650 ccw->flags = CCW_FLAG_IDA;
2651 ccw++;
2652 recid += count;
2653 new_track = 0;
2654 /* first idaw for a ccw may start anywhere */
2655 if (!idaw_dst)
2656 idaw_dst = dst;
2657 }
2658 /* If we start a new idaw, we must make sure that it
2659 * starts on an IDA_BLOCK_SIZE boundary.
2660 * If we continue an idaw, we must make sure that the
2661 * current segment begins where the so far accumulated
2662 * idaw ends
2663 */
2664 if (!idaw_dst) {
2665 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2666 dasd_sfree_request(cqr, startdev);
2667 return ERR_PTR(-ERANGE);
2668 } else
2669 idaw_dst = dst;
2670 }
2671 if ((idaw_dst + idaw_len) != dst) {
2672 dasd_sfree_request(cqr, startdev);
2673 return ERR_PTR(-ERANGE);
2674 }
2675 part_len = min(seg_len, len_to_track_end);
2676 seg_len -= part_len;
2677 dst += part_len;
2678 idaw_len += part_len;
2679 len_to_track_end -= part_len;
2680 /* collected memory area ends on an IDA_BLOCK border,
2681 * -> create an idaw
2682 * idal_create_words will handle cases where idaw_len
2683 * is larger then IDA_BLOCK_SIZE
2684 */
2685 if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2686 end_idaw = 1;
2687 /* We also need to end the idaw at track end */
2688 if (!len_to_track_end) {
2689 new_track = 1;
2690 end_idaw = 1;
2691 }
2692 if (end_idaw) {
2693 idaws = idal_create_words(idaws, idaw_dst,
2694 idaw_len);
2695 idaw_dst = NULL;
2696 idaw_len = 0;
2697 end_idaw = 0;
2698 }
2699 }
2700 }
2701
2702 if (blk_noretry_request(req) ||
2703 block->base->features & DASD_FEATURE_FAILFAST)
2704 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2705 cqr->startdev = startdev;
2706 cqr->memdev = startdev;
2707 cqr->block = block;
2708 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2709 cqr->lpm = startdev->path_data.ppm;
2710 cqr->retries = 256;
2711 cqr->buildclk = get_tod_clock();
2712 cqr->status = DASD_CQR_FILLED;
2713 return cqr;
2714 }
2715
2716 static int prepare_itcw(struct itcw *itcw,
2717 unsigned int trk, unsigned int totrk, int cmd,
2718 struct dasd_device *basedev,
2719 struct dasd_device *startdev,
2720 unsigned int rec_on_trk, int count,
2721 unsigned int blksize,
2722 unsigned int total_data_size,
2723 unsigned int tlf,
2724 unsigned int blk_per_trk)
2725 {
2726 struct PFX_eckd_data pfxdata;
2727 struct dasd_eckd_private *basepriv, *startpriv;
2728 struct DE_eckd_data *dedata;
2729 struct LRE_eckd_data *lredata;
2730 struct dcw *dcw;
2731
2732 u32 begcyl, endcyl;
2733 u16 heads, beghead, endhead;
2734 u8 pfx_cmd;
2735
2736 int rc = 0;
2737 int sector = 0;
2738 int dn, d;
2739
2740
2741 /* setup prefix data */
2742 basepriv = (struct dasd_eckd_private *) basedev->private;
2743 startpriv = (struct dasd_eckd_private *) startdev->private;
2744 dedata = &pfxdata.define_extent;
2745 lredata = &pfxdata.locate_record;
2746
2747 memset(&pfxdata, 0, sizeof(pfxdata));
2748 pfxdata.format = 1; /* PFX with LRE */
2749 pfxdata.base_address = basepriv->ned->unit_addr;
2750 pfxdata.base_lss = basepriv->ned->ID;
2751 pfxdata.validity.define_extent = 1;
2752
2753 /* private uid is kept up to date, conf_data may be outdated */
2754 if (startpriv->uid.type != UA_BASE_DEVICE) {
2755 pfxdata.validity.verify_base = 1;
2756 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2757 pfxdata.validity.hyper_pav = 1;
2758 }
2759
2760 switch (cmd) {
2761 case DASD_ECKD_CCW_READ_TRACK_DATA:
2762 dedata->mask.perm = 0x1;
2763 dedata->attributes.operation = basepriv->attrib.operation;
2764 dedata->blk_size = blksize;
2765 dedata->ga_extended |= 0x42;
2766 lredata->operation.orientation = 0x0;
2767 lredata->operation.operation = 0x0C;
2768 lredata->auxiliary.check_bytes = 0x01;
2769 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2770 break;
2771 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2772 dedata->mask.perm = 0x02;
2773 dedata->attributes.operation = basepriv->attrib.operation;
2774 dedata->blk_size = blksize;
2775 rc = check_XRC_on_prefix(&pfxdata, basedev);
2776 dedata->ga_extended |= 0x42;
2777 lredata->operation.orientation = 0x0;
2778 lredata->operation.operation = 0x3F;
2779 lredata->extended_operation = 0x23;
2780 lredata->auxiliary.check_bytes = 0x2;
2781 pfx_cmd = DASD_ECKD_CCW_PFX;
2782 break;
2783 default:
2784 DBF_DEV_EVENT(DBF_ERR, basedev,
2785 "prepare itcw, unknown opcode 0x%x", cmd);
2786 BUG();
2787 break;
2788 }
2789 if (rc)
2790 return rc;
2791
2792 dedata->attributes.mode = 0x3; /* ECKD */
2793
2794 heads = basepriv->rdc_data.trk_per_cyl;
2795 begcyl = trk / heads;
2796 beghead = trk % heads;
2797 endcyl = totrk / heads;
2798 endhead = totrk % heads;
2799
2800 /* check for sequential prestage - enhance cylinder range */
2801 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2802 dedata->attributes.operation == DASD_SEQ_ACCESS) {
2803
2804 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2805 endcyl += basepriv->attrib.nr_cyl;
2806 else
2807 endcyl = (basepriv->real_cyl - 1);
2808 }
2809
2810 set_ch_t(&dedata->beg_ext, begcyl, beghead);
2811 set_ch_t(&dedata->end_ext, endcyl, endhead);
2812
2813 dedata->ep_format = 0x20; /* records per track is valid */
2814 dedata->ep_rec_per_track = blk_per_trk;
2815
2816 if (rec_on_trk) {
2817 switch (basepriv->rdc_data.dev_type) {
2818 case 0x3390:
2819 dn = ceil_quot(blksize + 6, 232);
2820 d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2821 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2822 break;
2823 case 0x3380:
2824 d = 7 + ceil_quot(blksize + 12, 32);
2825 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2826 break;
2827 }
2828 }
2829
2830 lredata->auxiliary.length_valid = 1;
2831 lredata->auxiliary.length_scope = 1;
2832 lredata->auxiliary.imbedded_ccw_valid = 1;
2833 lredata->length = tlf;
2834 lredata->imbedded_ccw = cmd;
2835 lredata->count = count;
2836 lredata->sector = sector;
2837 set_ch_t(&lredata->seek_addr, begcyl, beghead);
2838 lredata->search_arg.cyl = lredata->seek_addr.cyl;
2839 lredata->search_arg.head = lredata->seek_addr.head;
2840 lredata->search_arg.record = rec_on_trk;
2841
2842 dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2843 &pfxdata, sizeof(pfxdata), total_data_size);
2844 return IS_ERR(dcw) ? PTR_ERR(dcw) : 0;
2845 }
2846
2847 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2848 struct dasd_device *startdev,
2849 struct dasd_block *block,
2850 struct request *req,
2851 sector_t first_rec,
2852 sector_t last_rec,
2853 sector_t first_trk,
2854 sector_t last_trk,
2855 unsigned int first_offs,
2856 unsigned int last_offs,
2857 unsigned int blk_per_trk,
2858 unsigned int blksize)
2859 {
2860 struct dasd_ccw_req *cqr;
2861 struct req_iterator iter;
2862 struct bio_vec *bv;
2863 char *dst;
2864 unsigned int trkcount, ctidaw;
2865 unsigned char cmd;
2866 struct dasd_device *basedev;
2867 unsigned int tlf;
2868 struct itcw *itcw;
2869 struct tidaw *last_tidaw = NULL;
2870 int itcw_op;
2871 size_t itcw_size;
2872 u8 tidaw_flags;
2873 unsigned int seg_len, part_len, len_to_track_end;
2874 unsigned char new_track;
2875 sector_t recid, trkid;
2876 unsigned int offs;
2877 unsigned int count, count_to_trk_end;
2878 int ret;
2879
2880 basedev = block->base;
2881 if (rq_data_dir(req) == READ) {
2882 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2883 itcw_op = ITCW_OP_READ;
2884 } else if (rq_data_dir(req) == WRITE) {
2885 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2886 itcw_op = ITCW_OP_WRITE;
2887 } else
2888 return ERR_PTR(-EINVAL);
2889
2890 /* trackbased I/O needs address all memory via TIDAWs,
2891 * not just for 64 bit addresses. This allows us to map
2892 * each segment directly to one tidaw.
2893 * In the case of write requests, additional tidaws may
2894 * be needed when a segment crosses a track boundary.
2895 */
2896 trkcount = last_trk - first_trk + 1;
2897 ctidaw = 0;
2898 rq_for_each_segment(bv, req, iter) {
2899 ++ctidaw;
2900 }
2901 if (rq_data_dir(req) == WRITE)
2902 ctidaw += (last_trk - first_trk);
2903
2904 /* Allocate the ccw request. */
2905 itcw_size = itcw_calc_size(0, ctidaw, 0);
2906 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2907 if (IS_ERR(cqr))
2908 return cqr;
2909
2910 /* transfer length factor: how many bytes to read from the last track */
2911 if (first_trk == last_trk)
2912 tlf = last_offs - first_offs + 1;
2913 else
2914 tlf = last_offs + 1;
2915 tlf *= blksize;
2916
2917 itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2918 if (IS_ERR(itcw)) {
2919 ret = -EINVAL;
2920 goto out_error;
2921 }
2922 cqr->cpaddr = itcw_get_tcw(itcw);
2923 if (prepare_itcw(itcw, first_trk, last_trk,
2924 cmd, basedev, startdev,
2925 first_offs + 1,
2926 trkcount, blksize,
2927 (last_rec - first_rec + 1) * blksize,
2928 tlf, blk_per_trk) == -EAGAIN) {
2929 /* Clock not in sync and XRC is enabled.
2930 * Try again later.
2931 */
2932 ret = -EAGAIN;
2933 goto out_error;
2934 }
2935 len_to_track_end = 0;
2936 /*
2937 * A tidaw can address 4k of memory, but must not cross page boundaries
2938 * We can let the block layer handle this by setting
2939 * blk_queue_segment_boundary to page boundaries and
2940 * blk_max_segment_size to page size when setting up the request queue.
2941 * For write requests, a TIDAW must not cross track boundaries, because
2942 * we have to set the CBC flag on the last tidaw for each track.
2943 */
2944 if (rq_data_dir(req) == WRITE) {
2945 new_track = 1;
2946 recid = first_rec;
2947 rq_for_each_segment(bv, req, iter) {
2948 dst = page_address(bv->bv_page) + bv->bv_offset;
2949 seg_len = bv->bv_len;
2950 while (seg_len) {
2951 if (new_track) {
2952 trkid = recid;
2953 offs = sector_div(trkid, blk_per_trk);
2954 count_to_trk_end = blk_per_trk - offs;
2955 count = min((last_rec - recid + 1),
2956 (sector_t)count_to_trk_end);
2957 len_to_track_end = count * blksize;
2958 recid += count;
2959 new_track = 0;
2960 }
2961 part_len = min(seg_len, len_to_track_end);
2962 seg_len -= part_len;
2963 len_to_track_end -= part_len;
2964 /* We need to end the tidaw at track end */
2965 if (!len_to_track_end) {
2966 new_track = 1;
2967 tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
2968 } else
2969 tidaw_flags = 0;
2970 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
2971 dst, part_len);
2972 if (IS_ERR(last_tidaw)) {
2973 ret = -EINVAL;
2974 goto out_error;
2975 }
2976 dst += part_len;
2977 }
2978 }
2979 } else {
2980 rq_for_each_segment(bv, req, iter) {
2981 dst = page_address(bv->bv_page) + bv->bv_offset;
2982 last_tidaw = itcw_add_tidaw(itcw, 0x00,
2983 dst, bv->bv_len);
2984 if (IS_ERR(last_tidaw)) {
2985 ret = -EINVAL;
2986 goto out_error;
2987 }
2988 }
2989 }
2990 last_tidaw->flags |= TIDAW_FLAGS_LAST;
2991 last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
2992 itcw_finalize(itcw);
2993
2994 if (blk_noretry_request(req) ||
2995 block->base->features & DASD_FEATURE_FAILFAST)
2996 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2997 cqr->cpmode = 1;
2998 cqr->startdev = startdev;
2999 cqr->memdev = startdev;
3000 cqr->block = block;
3001 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
3002 cqr->lpm = startdev->path_data.ppm;
3003 cqr->retries = 256;
3004 cqr->buildclk = get_tod_clock();
3005 cqr->status = DASD_CQR_FILLED;
3006 return cqr;
3007 out_error:
3008 dasd_sfree_request(cqr, startdev);
3009 return ERR_PTR(ret);
3010 }
3011
3012 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3013 struct dasd_block *block,
3014 struct request *req)
3015 {
3016 int cmdrtd, cmdwtd;
3017 int use_prefix;
3018 int fcx_multitrack;
3019 struct dasd_eckd_private *private;
3020 struct dasd_device *basedev;
3021 sector_t first_rec, last_rec;
3022 sector_t first_trk, last_trk;
3023 unsigned int first_offs, last_offs;
3024 unsigned int blk_per_trk, blksize;
3025 int cdlspecial;
3026 unsigned int data_size;
3027 struct dasd_ccw_req *cqr;
3028
3029 basedev = block->base;
3030 private = (struct dasd_eckd_private *) basedev->private;
3031
3032 /* Calculate number of blocks/records per track. */
3033 blksize = block->bp_block;
3034 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3035 if (blk_per_trk == 0)
3036 return ERR_PTR(-EINVAL);
3037 /* Calculate record id of first and last block. */
3038 first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3039 first_offs = sector_div(first_trk, blk_per_trk);
3040 last_rec = last_trk =
3041 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3042 last_offs = sector_div(last_trk, blk_per_trk);
3043 cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3044
3045 fcx_multitrack = private->features.feature[40] & 0x20;
3046 data_size = blk_rq_bytes(req);
3047 /* tpm write request add CBC data on each track boundary */
3048 if (rq_data_dir(req) == WRITE)
3049 data_size += (last_trk - first_trk) * 4;
3050
3051 /* is read track data and write track data in command mode supported? */
3052 cmdrtd = private->features.feature[9] & 0x20;
3053 cmdwtd = private->features.feature[12] & 0x40;
3054 use_prefix = private->features.feature[8] & 0x01;
3055
3056 cqr = NULL;
3057 if (cdlspecial || dasd_page_cache) {
3058 /* do nothing, just fall through to the cmd mode single case */
3059 } else if ((data_size <= private->fcx_max_data)
3060 && (fcx_multitrack || (first_trk == last_trk))) {
3061 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3062 first_rec, last_rec,
3063 first_trk, last_trk,
3064 first_offs, last_offs,
3065 blk_per_trk, blksize);
3066 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3067 (PTR_ERR(cqr) != -ENOMEM))
3068 cqr = NULL;
3069 } else if (use_prefix &&
3070 (((rq_data_dir(req) == READ) && cmdrtd) ||
3071 ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3072 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3073 first_rec, last_rec,
3074 first_trk, last_trk,
3075 first_offs, last_offs,
3076 blk_per_trk, blksize);
3077 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3078 (PTR_ERR(cqr) != -ENOMEM))
3079 cqr = NULL;
3080 }
3081 if (!cqr)
3082 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3083 first_rec, last_rec,
3084 first_trk, last_trk,
3085 first_offs, last_offs,
3086 blk_per_trk, blksize);
3087 return cqr;
3088 }
3089
3090 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3091 struct dasd_block *block,
3092 struct request *req)
3093 {
3094 unsigned long *idaws;
3095 struct dasd_device *basedev;
3096 struct dasd_ccw_req *cqr;
3097 struct ccw1 *ccw;
3098 struct req_iterator iter;
3099 struct bio_vec *bv;
3100 char *dst;
3101 unsigned char cmd;
3102 unsigned int trkcount;
3103 unsigned int seg_len, len_to_track_end;
3104 unsigned int first_offs;
3105 unsigned int cidaw, cplength, datasize;
3106 sector_t first_trk, last_trk;
3107 unsigned int pfx_datasize;
3108
3109 /*
3110 * raw track access needs to be mutiple of 64k and on 64k boundary
3111 */
3112 if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
3113 cqr = ERR_PTR(-EINVAL);
3114 goto out;
3115 }
3116 if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
3117 DASD_RAW_SECTORS_PER_TRACK) != 0) {
3118 cqr = ERR_PTR(-EINVAL);
3119 goto out;
3120 }
3121
3122 first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3123 last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3124 DASD_RAW_SECTORS_PER_TRACK;
3125 trkcount = last_trk - first_trk + 1;
3126 first_offs = 0;
3127 basedev = block->base;
3128
3129 if (rq_data_dir(req) == READ)
3130 cmd = DASD_ECKD_CCW_READ_TRACK;
3131 else if (rq_data_dir(req) == WRITE)
3132 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3133 else {
3134 cqr = ERR_PTR(-EINVAL);
3135 goto out;
3136 }
3137
3138 /*
3139 * Raw track based I/O needs IDAWs for each page,
3140 * and not just for 64 bit addresses.
3141 */
3142 cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3143
3144 /* 1x prefix + one read/write ccw per track */
3145 cplength = 1 + trkcount;
3146
3147 /*
3148 * struct PFX_eckd_data has up to 2 byte as extended parameter
3149 * this is needed for write full track and has to be mentioned
3150 * separately
3151 * add 8 instead of 2 to keep 8 byte boundary
3152 */
3153 pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3154
3155 datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3156
3157 /* Allocate the ccw request. */
3158 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3159 datasize, startdev);
3160 if (IS_ERR(cqr))
3161 goto out;
3162 ccw = cqr->cpaddr;
3163
3164 if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3165 basedev, startdev, 1 /* format */, first_offs + 1,
3166 trkcount, 0, 0) == -EAGAIN) {
3167 /* Clock not in sync and XRC is enabled.
3168 * Try again later.
3169 */
3170 dasd_sfree_request(cqr, startdev);
3171 cqr = ERR_PTR(-EAGAIN);
3172 goto out;
3173 }
3174
3175 idaws = (unsigned long *)(cqr->data + pfx_datasize);
3176
3177 len_to_track_end = 0;
3178
3179 rq_for_each_segment(bv, req, iter) {
3180 dst = page_address(bv->bv_page) + bv->bv_offset;
3181 seg_len = bv->bv_len;
3182 if (!len_to_track_end) {
3183 ccw[-1].flags |= CCW_FLAG_CC;
3184 ccw->cmd_code = cmd;
3185 /* maximum 3390 track size */
3186 ccw->count = 57326;
3187 /* 64k map to one track */
3188 len_to_track_end = 65536;
3189 ccw->cda = (__u32)(addr_t)idaws;
3190 ccw->flags |= CCW_FLAG_IDA;
3191 ccw->flags |= CCW_FLAG_SLI;
3192 ccw++;
3193 }
3194 len_to_track_end -= seg_len;
3195 idaws = idal_create_words(idaws, dst, seg_len);
3196 }
3197
3198 if (blk_noretry_request(req) ||
3199 block->base->features & DASD_FEATURE_FAILFAST)
3200 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3201 cqr->startdev = startdev;
3202 cqr->memdev = startdev;
3203 cqr->block = block;
3204 cqr->expires = startdev->default_expires * HZ;
3205 cqr->lpm = startdev->path_data.ppm;
3206 cqr->retries = 256;
3207 cqr->buildclk = get_tod_clock();
3208 cqr->status = DASD_CQR_FILLED;
3209
3210 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3211 cqr = NULL;
3212 out:
3213 return cqr;
3214 }
3215
3216
3217 static int
3218 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3219 {
3220 struct dasd_eckd_private *private;
3221 struct ccw1 *ccw;
3222 struct req_iterator iter;
3223 struct bio_vec *bv;
3224 char *dst, *cda;
3225 unsigned int blksize, blk_per_trk, off;
3226 sector_t recid;
3227 int status;
3228
3229 if (!dasd_page_cache)
3230 goto out;
3231 private = (struct dasd_eckd_private *) cqr->block->base->private;
3232 blksize = cqr->block->bp_block;
3233 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3234 recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3235 ccw = cqr->cpaddr;
3236 /* Skip over define extent & locate record. */
3237 ccw++;
3238 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3239 ccw++;
3240 rq_for_each_segment(bv, req, iter) {
3241 dst = page_address(bv->bv_page) + bv->bv_offset;
3242 for (off = 0; off < bv->bv_len; off += blksize) {
3243 /* Skip locate record. */
3244 if (private->uses_cdl && recid <= 2*blk_per_trk)
3245 ccw++;
3246 if (dst) {
3247 if (ccw->flags & CCW_FLAG_IDA)
3248 cda = *((char **)((addr_t) ccw->cda));
3249 else
3250 cda = (char *)((addr_t) ccw->cda);
3251 if (dst != cda) {
3252 if (rq_data_dir(req) == READ)
3253 memcpy(dst, cda, bv->bv_len);
3254 kmem_cache_free(dasd_page_cache,
3255 (void *)((addr_t)cda & PAGE_MASK));
3256 }
3257 dst = NULL;
3258 }
3259 ccw++;
3260 recid++;
3261 }
3262 }
3263 out:
3264 status = cqr->status == DASD_CQR_DONE;
3265 dasd_sfree_request(cqr, cqr->memdev);
3266 return status;
3267 }
3268
3269 /*
3270 * Modify ccw/tcw in cqr so it can be started on a base device.
3271 *
3272 * Note that this is not enough to restart the cqr!
3273 * Either reset cqr->startdev as well (summary unit check handling)
3274 * or restart via separate cqr (as in ERP handling).
3275 */
3276 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3277 {
3278 struct ccw1 *ccw;
3279 struct PFX_eckd_data *pfxdata;
3280 struct tcw *tcw;
3281 struct tccb *tccb;
3282 struct dcw *dcw;
3283
3284 if (cqr->cpmode == 1) {
3285 tcw = cqr->cpaddr;
3286 tccb = tcw_get_tccb(tcw);
3287 dcw = (struct dcw *)&tccb->tca[0];
3288 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3289 pfxdata->validity.verify_base = 0;
3290 pfxdata->validity.hyper_pav = 0;
3291 } else {
3292 ccw = cqr->cpaddr;
3293 pfxdata = cqr->data;
3294 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3295 pfxdata->validity.verify_base = 0;
3296 pfxdata->validity.hyper_pav = 0;
3297 }
3298 }
3299 }
3300
3301 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3302
3303 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3304 struct dasd_block *block,
3305 struct request *req)
3306 {
3307 struct dasd_eckd_private *private;
3308 struct dasd_device *startdev;
3309 unsigned long flags;
3310 struct dasd_ccw_req *cqr;
3311
3312 startdev = dasd_alias_get_start_dev(base);
3313 if (!startdev)
3314 startdev = base;
3315 private = (struct dasd_eckd_private *) startdev->private;
3316 if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3317 return ERR_PTR(-EBUSY);
3318
3319 spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3320 private->count++;
3321 if ((base->features & DASD_FEATURE_USERAW))
3322 cqr = dasd_raw_build_cp(startdev, block, req);
3323 else
3324 cqr = dasd_eckd_build_cp(startdev, block, req);
3325 if (IS_ERR(cqr))
3326 private->count--;
3327 spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3328 return cqr;
3329 }
3330
3331 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3332 struct request *req)
3333 {
3334 struct dasd_eckd_private *private;
3335 unsigned long flags;
3336
3337 spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3338 private = (struct dasd_eckd_private *) cqr->memdev->private;
3339 private->count--;
3340 spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3341 return dasd_eckd_free_cp(cqr, req);
3342 }
3343
3344 static int
3345 dasd_eckd_fill_info(struct dasd_device * device,
3346 struct dasd_information2_t * info)
3347 {
3348 struct dasd_eckd_private *private;
3349
3350 private = (struct dasd_eckd_private *) device->private;
3351 info->label_block = 2;
3352 info->FBA_layout = private->uses_cdl ? 0 : 1;
3353 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3354 info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3355 memcpy(info->characteristics, &private->rdc_data,
3356 sizeof(struct dasd_eckd_characteristics));
3357 info->confdata_size = min((unsigned long)private->conf_len,
3358 sizeof(info->configuration_data));
3359 memcpy(info->configuration_data, private->conf_data,
3360 info->confdata_size);
3361 return 0;
3362 }
3363
3364 /*
3365 * SECTION: ioctl functions for eckd devices.
3366 */
3367
3368 /*
3369 * Release device ioctl.
3370 * Buils a channel programm to releases a prior reserved
3371 * (see dasd_eckd_reserve) device.
3372 */
3373 static int
3374 dasd_eckd_release(struct dasd_device *device)
3375 {
3376 struct dasd_ccw_req *cqr;
3377 int rc;
3378 struct ccw1 *ccw;
3379 int useglobal;
3380
3381 if (!capable(CAP_SYS_ADMIN))
3382 return -EACCES;
3383
3384 useglobal = 0;
3385 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3386 if (IS_ERR(cqr)) {
3387 mutex_lock(&dasd_reserve_mutex);
3388 useglobal = 1;
3389 cqr = &dasd_reserve_req->cqr;
3390 memset(cqr, 0, sizeof(*cqr));
3391 memset(&dasd_reserve_req->ccw, 0,
3392 sizeof(dasd_reserve_req->ccw));
3393 cqr->cpaddr = &dasd_reserve_req->ccw;
3394 cqr->data = &dasd_reserve_req->data;
3395 cqr->magic = DASD_ECKD_MAGIC;
3396 }
3397 ccw = cqr->cpaddr;
3398 ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3399 ccw->flags |= CCW_FLAG_SLI;
3400 ccw->count = 32;
3401 ccw->cda = (__u32)(addr_t) cqr->data;
3402 cqr->startdev = device;
3403 cqr->memdev = device;
3404 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3405 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3406 cqr->retries = 2; /* set retry counter to enable basic ERP */
3407 cqr->expires = 2 * HZ;
3408 cqr->buildclk = get_tod_clock();
3409 cqr->status = DASD_CQR_FILLED;
3410
3411 rc = dasd_sleep_on_immediatly(cqr);
3412 if (!rc)
3413 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3414
3415 if (useglobal)
3416 mutex_unlock(&dasd_reserve_mutex);
3417 else
3418 dasd_sfree_request(cqr, cqr->memdev);
3419 return rc;
3420 }
3421
3422 /*
3423 * Reserve device ioctl.
3424 * Options are set to 'synchronous wait for interrupt' and
3425 * 'timeout the request'. This leads to a terminate IO if
3426 * the interrupt is outstanding for a certain time.
3427 */
3428 static int
3429 dasd_eckd_reserve(struct dasd_device *device)
3430 {
3431 struct dasd_ccw_req *cqr;
3432 int rc;
3433 struct ccw1 *ccw;
3434 int useglobal;
3435
3436 if (!capable(CAP_SYS_ADMIN))
3437 return -EACCES;
3438
3439 useglobal = 0;
3440 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3441 if (IS_ERR(cqr)) {
3442 mutex_lock(&dasd_reserve_mutex);
3443 useglobal = 1;
3444 cqr = &dasd_reserve_req->cqr;
3445 memset(cqr, 0, sizeof(*cqr));
3446 memset(&dasd_reserve_req->ccw, 0,
3447 sizeof(dasd_reserve_req->ccw));
3448 cqr->cpaddr = &dasd_reserve_req->ccw;
3449 cqr->data = &dasd_reserve_req->data;
3450 cqr->magic = DASD_ECKD_MAGIC;
3451 }
3452 ccw = cqr->cpaddr;
3453 ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3454 ccw->flags |= CCW_FLAG_SLI;
3455 ccw->count = 32;
3456 ccw->cda = (__u32)(addr_t) cqr->data;
3457 cqr->startdev = device;
3458 cqr->memdev = device;
3459 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3460 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3461 cqr->retries = 2; /* set retry counter to enable basic ERP */
3462 cqr->expires = 2 * HZ;
3463 cqr->buildclk = get_tod_clock();
3464 cqr->status = DASD_CQR_FILLED;
3465
3466 rc = dasd_sleep_on_immediatly(cqr);
3467 if (!rc)
3468 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3469
3470 if (useglobal)
3471 mutex_unlock(&dasd_reserve_mutex);
3472 else
3473 dasd_sfree_request(cqr, cqr->memdev);
3474 return rc;
3475 }
3476
3477 /*
3478 * Steal lock ioctl - unconditional reserve device.
3479 * Buils a channel programm to break a device's reservation.
3480 * (unconditional reserve)
3481 */
3482 static int
3483 dasd_eckd_steal_lock(struct dasd_device *device)
3484 {
3485 struct dasd_ccw_req *cqr;
3486 int rc;
3487 struct ccw1 *ccw;
3488 int useglobal;
3489
3490 if (!capable(CAP_SYS_ADMIN))
3491 return -EACCES;
3492
3493 useglobal = 0;
3494 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3495 if (IS_ERR(cqr)) {
3496 mutex_lock(&dasd_reserve_mutex);
3497 useglobal = 1;
3498 cqr = &dasd_reserve_req->cqr;
3499 memset(cqr, 0, sizeof(*cqr));
3500 memset(&dasd_reserve_req->ccw, 0,
3501 sizeof(dasd_reserve_req->ccw));
3502 cqr->cpaddr = &dasd_reserve_req->ccw;
3503 cqr->data = &dasd_reserve_req->data;
3504 cqr->magic = DASD_ECKD_MAGIC;
3505 }
3506 ccw = cqr->cpaddr;
3507 ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3508 ccw->flags |= CCW_FLAG_SLI;
3509 ccw->count = 32;
3510 ccw->cda = (__u32)(addr_t) cqr->data;
3511 cqr->startdev = device;
3512 cqr->memdev = device;
3513 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3514 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3515 cqr->retries = 2; /* set retry counter to enable basic ERP */
3516 cqr->expires = 2 * HZ;
3517 cqr->buildclk = get_tod_clock();
3518 cqr->status = DASD_CQR_FILLED;
3519
3520 rc = dasd_sleep_on_immediatly(cqr);
3521 if (!rc)
3522 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3523
3524 if (useglobal)
3525 mutex_unlock(&dasd_reserve_mutex);
3526 else
3527 dasd_sfree_request(cqr, cqr->memdev);
3528 return rc;
3529 }
3530
3531 /*
3532 * SNID - Sense Path Group ID
3533 * This ioctl may be used in situations where I/O is stalled due to
3534 * a reserve, so if the normal dasd_smalloc_request fails, we use the
3535 * preallocated dasd_reserve_req.
3536 */
3537 static int dasd_eckd_snid(struct dasd_device *device,
3538 void __user *argp)
3539 {
3540 struct dasd_ccw_req *cqr;
3541 int rc;
3542 struct ccw1 *ccw;
3543 int useglobal;
3544 struct dasd_snid_ioctl_data usrparm;
3545
3546 if (!capable(CAP_SYS_ADMIN))
3547 return -EACCES;
3548
3549 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3550 return -EFAULT;
3551
3552 useglobal = 0;
3553 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3554 sizeof(struct dasd_snid_data), device);
3555 if (IS_ERR(cqr)) {
3556 mutex_lock(&dasd_reserve_mutex);
3557 useglobal = 1;
3558 cqr = &dasd_reserve_req->cqr;
3559 memset(cqr, 0, sizeof(*cqr));
3560 memset(&dasd_reserve_req->ccw, 0,
3561 sizeof(dasd_reserve_req->ccw));
3562 cqr->cpaddr = &dasd_reserve_req->ccw;
3563 cqr->data = &dasd_reserve_req->data;
3564 cqr->magic = DASD_ECKD_MAGIC;
3565 }
3566 ccw = cqr->cpaddr;
3567 ccw->cmd_code = DASD_ECKD_CCW_SNID;
3568 ccw->flags |= CCW_FLAG_SLI;
3569 ccw->count = 12;
3570 ccw->cda = (__u32)(addr_t) cqr->data;
3571 cqr->startdev = device;
3572 cqr->memdev = device;
3573 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3574 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3575 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3576 cqr->retries = 5;
3577 cqr->expires = 10 * HZ;
3578 cqr->buildclk = get_tod_clock();
3579 cqr->status = DASD_CQR_FILLED;
3580 cqr->lpm = usrparm.path_mask;
3581
3582 rc = dasd_sleep_on_immediatly(cqr);
3583 /* verify that I/O processing didn't modify the path mask */
3584 if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3585 rc = -EIO;
3586 if (!rc) {
3587 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3588 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3589 rc = -EFAULT;
3590 }
3591
3592 if (useglobal)
3593 mutex_unlock(&dasd_reserve_mutex);
3594 else
3595 dasd_sfree_request(cqr, cqr->memdev);
3596 return rc;
3597 }
3598
3599 /*
3600 * Read performance statistics
3601 */
3602 static int
3603 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3604 {
3605 struct dasd_psf_prssd_data *prssdp;
3606 struct dasd_rssd_perf_stats_t *stats;
3607 struct dasd_ccw_req *cqr;
3608 struct ccw1 *ccw;
3609 int rc;
3610
3611 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
3612 (sizeof(struct dasd_psf_prssd_data) +
3613 sizeof(struct dasd_rssd_perf_stats_t)),
3614 device);
3615 if (IS_ERR(cqr)) {
3616 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3617 "Could not allocate initialization request");
3618 return PTR_ERR(cqr);
3619 }
3620 cqr->startdev = device;
3621 cqr->memdev = device;
3622 cqr->retries = 0;
3623 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3624 cqr->expires = 10 * HZ;
3625
3626 /* Prepare for Read Subsystem Data */
3627 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3628 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3629 prssdp->order = PSF_ORDER_PRSSD;
3630 prssdp->suborder = 0x01; /* Performance Statistics */
3631 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
3632
3633 ccw = cqr->cpaddr;
3634 ccw->cmd_code = DASD_ECKD_CCW_PSF;
3635 ccw->count = sizeof(struct dasd_psf_prssd_data);
3636 ccw->flags |= CCW_FLAG_CC;
3637 ccw->cda = (__u32)(addr_t) prssdp;
3638
3639 /* Read Subsystem Data - Performance Statistics */
3640 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3641 memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3642
3643 ccw++;
3644 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3645 ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3646 ccw->cda = (__u32)(addr_t) stats;
3647
3648 cqr->buildclk = get_tod_clock();
3649 cqr->status = DASD_CQR_FILLED;
3650 rc = dasd_sleep_on(cqr);
3651 if (rc == 0) {
3652 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3653 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3654 if (copy_to_user(argp, stats,
3655 sizeof(struct dasd_rssd_perf_stats_t)))
3656 rc = -EFAULT;
3657 }
3658 dasd_sfree_request(cqr, cqr->memdev);
3659 return rc;
3660 }
3661
3662 /*
3663 * Get attributes (cache operations)
3664 * Returnes the cache attributes used in Define Extend (DE).
3665 */
3666 static int
3667 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3668 {
3669 struct dasd_eckd_private *private =
3670 (struct dasd_eckd_private *)device->private;
3671 struct attrib_data_t attrib = private->attrib;
3672 int rc;
3673
3674 if (!capable(CAP_SYS_ADMIN))
3675 return -EACCES;
3676 if (!argp)
3677 return -EINVAL;
3678
3679 rc = 0;
3680 if (copy_to_user(argp, (long *) &attrib,
3681 sizeof(struct attrib_data_t)))
3682 rc = -EFAULT;
3683
3684 return rc;
3685 }
3686
3687 /*
3688 * Set attributes (cache operations)
3689 * Stores the attributes for cache operation to be used in Define Extend (DE).
3690 */
3691 static int
3692 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3693 {
3694 struct dasd_eckd_private *private =
3695 (struct dasd_eckd_private *)device->private;
3696 struct attrib_data_t attrib;
3697
3698 if (!capable(CAP_SYS_ADMIN))
3699 return -EACCES;
3700 if (!argp)
3701 return -EINVAL;
3702
3703 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3704 return -EFAULT;
3705 private->attrib = attrib;
3706
3707 dev_info(&device->cdev->dev,
3708 "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3709 private->attrib.operation, private->attrib.nr_cyl);
3710 return 0;
3711 }
3712
3713 /*
3714 * Issue syscall I/O to EMC Symmetrix array.
3715 * CCWs are PSF and RSSD
3716 */
3717 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3718 {
3719 struct dasd_symmio_parms usrparm;
3720 char *psf_data, *rssd_result;
3721 struct dasd_ccw_req *cqr;
3722 struct ccw1 *ccw;
3723 char psf0, psf1;
3724 int rc;
3725
3726 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3727 return -EACCES;
3728 psf0 = psf1 = 0;
3729
3730 /* Copy parms from caller */
3731 rc = -EFAULT;
3732 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3733 goto out;
3734 if (is_compat_task() || sizeof(long) == 4) {
3735 /* Make sure pointers are sane even on 31 bit. */
3736 rc = -EINVAL;
3737 if ((usrparm.psf_data >> 32) != 0)
3738 goto out;
3739 if ((usrparm.rssd_result >> 32) != 0)
3740 goto out;
3741 usrparm.psf_data &= 0x7fffffffULL;
3742 usrparm.rssd_result &= 0x7fffffffULL;
3743 }
3744 /* alloc I/O data area */
3745 psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3746 rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3747 if (!psf_data || !rssd_result) {
3748 rc = -ENOMEM;
3749 goto out_free;
3750 }
3751
3752 /* get syscall header from user space */
3753 rc = -EFAULT;
3754 if (copy_from_user(psf_data,
3755 (void __user *)(unsigned long) usrparm.psf_data,
3756 usrparm.psf_data_len))
3757 goto out_free;
3758 psf0 = psf_data[0];
3759 psf1 = psf_data[1];
3760
3761 /* setup CCWs for PSF + RSSD */
3762 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3763 if (IS_ERR(cqr)) {
3764 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3765 "Could not allocate initialization request");
3766 rc = PTR_ERR(cqr);
3767 goto out_free;
3768 }
3769
3770 cqr->startdev = device;
3771 cqr->memdev = device;
3772 cqr->retries = 3;
3773 cqr->expires = 10 * HZ;
3774 cqr->buildclk = get_tod_clock();
3775 cqr->status = DASD_CQR_FILLED;
3776
3777 /* Build the ccws */
3778 ccw = cqr->cpaddr;
3779
3780 /* PSF ccw */
3781 ccw->cmd_code = DASD_ECKD_CCW_PSF;
3782 ccw->count = usrparm.psf_data_len;
3783 ccw->flags |= CCW_FLAG_CC;
3784 ccw->cda = (__u32)(addr_t) psf_data;
3785
3786 ccw++;
3787
3788 /* RSSD ccw */
3789 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3790 ccw->count = usrparm.rssd_result_len;
3791 ccw->flags = CCW_FLAG_SLI ;
3792 ccw->cda = (__u32)(addr_t) rssd_result;
3793
3794 rc = dasd_sleep_on(cqr);
3795 if (rc)
3796 goto out_sfree;
3797
3798 rc = -EFAULT;
3799 if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3800 rssd_result, usrparm.rssd_result_len))
3801 goto out_sfree;
3802 rc = 0;
3803
3804 out_sfree:
3805 dasd_sfree_request(cqr, cqr->memdev);
3806 out_free:
3807 kfree(rssd_result);
3808 kfree(psf_data);
3809 out:
3810 DBF_DEV_EVENT(DBF_WARNING, device,
3811 "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3812 (int) psf0, (int) psf1, rc);
3813 return rc;
3814 }
3815
3816 static int
3817 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3818 {
3819 struct dasd_device *device = block->base;
3820
3821 switch (cmd) {
3822 case BIODASDGATTR:
3823 return dasd_eckd_get_attrib(device, argp);
3824 case BIODASDSATTR:
3825 return dasd_eckd_set_attrib(device, argp);
3826 case BIODASDPSRD:
3827 return dasd_eckd_performance(device, argp);
3828 case BIODASDRLSE:
3829 return dasd_eckd_release(device);
3830 case BIODASDRSRV:
3831 return dasd_eckd_reserve(device);
3832 case BIODASDSLCK:
3833 return dasd_eckd_steal_lock(device);
3834 case BIODASDSNID:
3835 return dasd_eckd_snid(device, argp);
3836 case BIODASDSYMMIO:
3837 return dasd_symm_io(device, argp);
3838 default:
3839 return -ENOTTY;
3840 }
3841 }
3842
3843 /*
3844 * Dump the range of CCWs into 'page' buffer
3845 * and return number of printed chars.
3846 */
3847 static int
3848 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
3849 {
3850 int len, count;
3851 char *datap;
3852
3853 len = 0;
3854 while (from <= to) {
3855 len += sprintf(page + len, PRINTK_HEADER
3856 " CCW %p: %08X %08X DAT:",
3857 from, ((int *) from)[0], ((int *) from)[1]);
3858
3859 /* get pointer to data (consider IDALs) */
3860 if (from->flags & CCW_FLAG_IDA)
3861 datap = (char *) *((addr_t *) (addr_t) from->cda);
3862 else
3863 datap = (char *) ((addr_t) from->cda);
3864
3865 /* dump data (max 32 bytes) */
3866 for (count = 0; count < from->count && count < 32; count++) {
3867 if (count % 8 == 0) len += sprintf(page + len, " ");
3868 if (count % 4 == 0) len += sprintf(page + len, " ");
3869 len += sprintf(page + len, "%02x", datap[count]);
3870 }
3871 len += sprintf(page + len, "\n");
3872 from++;
3873 }
3874 return len;
3875 }
3876
3877 static void
3878 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
3879 char *reason)
3880 {
3881 u64 *sense;
3882 u64 *stat;
3883
3884 sense = (u64 *) dasd_get_sense(irb);
3885 stat = (u64 *) &irb->scsw;
3886 if (sense) {
3887 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
3888 "%016llx %016llx %016llx %016llx",
3889 reason, *stat, *((u32 *) (stat + 1)),
3890 sense[0], sense[1], sense[2], sense[3]);
3891 } else {
3892 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
3893 reason, *stat, *((u32 *) (stat + 1)),
3894 "NO VALID SENSE");
3895 }
3896 }
3897
3898 /*
3899 * Print sense data and related channel program.
3900 * Parts are printed because printk buffer is only 1024 bytes.
3901 */
3902 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3903 struct dasd_ccw_req *req, struct irb *irb)
3904 {
3905 char *page;
3906 struct ccw1 *first, *last, *fail, *from, *to;
3907 int len, sl, sct;
3908
3909 page = (char *) get_zeroed_page(GFP_ATOMIC);
3910 if (page == NULL) {
3911 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3912 "No memory to dump sense data\n");
3913 return;
3914 }
3915 /* dump the sense data */
3916 len = sprintf(page, PRINTK_HEADER
3917 " I/O status report for device %s:\n",
3918 dev_name(&device->cdev->dev));
3919 len += sprintf(page + len, PRINTK_HEADER
3920 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3921 "CS:%02X RC:%d\n",
3922 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3923 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3924 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3925 req ? req->intrc : 0);
3926 len += sprintf(page + len, PRINTK_HEADER
3927 " device %s: Failing CCW: %p\n",
3928 dev_name(&device->cdev->dev),
3929 (void *) (addr_t) irb->scsw.cmd.cpa);
3930 if (irb->esw.esw0.erw.cons) {
3931 for (sl = 0; sl < 4; sl++) {
3932 len += sprintf(page + len, PRINTK_HEADER
3933 " Sense(hex) %2d-%2d:",
3934 (8 * sl), ((8 * sl) + 7));
3935
3936 for (sct = 0; sct < 8; sct++) {
3937 len += sprintf(page + len, " %02x",
3938 irb->ecw[8 * sl + sct]);
3939 }
3940 len += sprintf(page + len, "\n");
3941 }
3942
3943 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3944 /* 24 Byte Sense Data */
3945 sprintf(page + len, PRINTK_HEADER
3946 " 24 Byte: %x MSG %x, "
3947 "%s MSGb to SYSOP\n",
3948 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3949 irb->ecw[1] & 0x10 ? "" : "no");
3950 } else {
3951 /* 32 Byte Sense Data */
3952 sprintf(page + len, PRINTK_HEADER
3953 " 32 Byte: Format: %x "
3954 "Exception class %x\n",
3955 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3956 }
3957 } else {
3958 sprintf(page + len, PRINTK_HEADER
3959 " SORRY - NO VALID SENSE AVAILABLE\n");
3960 }
3961 printk(KERN_ERR "%s", page);
3962
3963 if (req) {
3964 /* req == NULL for unsolicited interrupts */
3965 /* dump the Channel Program (max 140 Bytes per line) */
3966 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3967 first = req->cpaddr;
3968 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3969 to = min(first + 6, last);
3970 len = sprintf(page, PRINTK_HEADER
3971 " Related CP in req: %p\n", req);
3972 dasd_eckd_dump_ccw_range(first, to, page + len);
3973 printk(KERN_ERR "%s", page);
3974
3975 /* print failing CCW area (maximum 4) */
3976 /* scsw->cda is either valid or zero */
3977 len = 0;
3978 from = ++to;
3979 fail = (struct ccw1 *)(addr_t)
3980 irb->scsw.cmd.cpa; /* failing CCW */
3981 if (from < fail - 2) {
3982 from = fail - 2; /* there is a gap - print header */
3983 len += sprintf(page, PRINTK_HEADER "......\n");
3984 }
3985 to = min(fail + 1, last);
3986 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3987
3988 /* print last CCWs (maximum 2) */
3989 from = max(from, ++to);
3990 if (from < last - 1) {
3991 from = last - 1; /* there is a gap - print header */
3992 len += sprintf(page + len, PRINTK_HEADER "......\n");
3993 }
3994 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3995 if (len > 0)
3996 printk(KERN_ERR "%s", page);
3997 }
3998 free_page((unsigned long) page);
3999 }
4000
4001
4002 /*
4003 * Print sense data from a tcw.
4004 */
4005 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4006 struct dasd_ccw_req *req, struct irb *irb)
4007 {
4008 char *page;
4009 int len, sl, sct, residual;
4010 struct tsb *tsb;
4011 u8 *sense, *rcq;
4012
4013 page = (char *) get_zeroed_page(GFP_ATOMIC);
4014 if (page == NULL) {
4015 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4016 "No memory to dump sense data");
4017 return;
4018 }
4019 /* dump the sense data */
4020 len = sprintf(page, PRINTK_HEADER
4021 " I/O status report for device %s:\n",
4022 dev_name(&device->cdev->dev));
4023 len += sprintf(page + len, PRINTK_HEADER
4024 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4025 "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4026 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4027 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4028 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4029 irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4030 req ? req->intrc : 0);
4031 len += sprintf(page + len, PRINTK_HEADER
4032 " device %s: Failing TCW: %p\n",
4033 dev_name(&device->cdev->dev),
4034 (void *) (addr_t) irb->scsw.tm.tcw);
4035
4036 tsb = NULL;
4037 sense = NULL;
4038 if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4039 tsb = tcw_get_tsb(
4040 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4041
4042 if (tsb) {
4043 len += sprintf(page + len, PRINTK_HEADER
4044 " tsb->length %d\n", tsb->length);
4045 len += sprintf(page + len, PRINTK_HEADER
4046 " tsb->flags %x\n", tsb->flags);
4047 len += sprintf(page + len, PRINTK_HEADER
4048 " tsb->dcw_offset %d\n", tsb->dcw_offset);
4049 len += sprintf(page + len, PRINTK_HEADER
4050 " tsb->count %d\n", tsb->count);
4051 residual = tsb->count - 28;
4052 len += sprintf(page + len, PRINTK_HEADER
4053 " residual %d\n", residual);
4054
4055 switch (tsb->flags & 0x07) {
4056 case 1: /* tsa_iostat */
4057 len += sprintf(page + len, PRINTK_HEADER
4058 " tsb->tsa.iostat.dev_time %d\n",
4059 tsb->tsa.iostat.dev_time);
4060 len += sprintf(page + len, PRINTK_HEADER
4061 " tsb->tsa.iostat.def_time %d\n",
4062 tsb->tsa.iostat.def_time);
4063 len += sprintf(page + len, PRINTK_HEADER
4064 " tsb->tsa.iostat.queue_time %d\n",
4065 tsb->tsa.iostat.queue_time);
4066 len += sprintf(page + len, PRINTK_HEADER
4067 " tsb->tsa.iostat.dev_busy_time %d\n",
4068 tsb->tsa.iostat.dev_busy_time);
4069 len += sprintf(page + len, PRINTK_HEADER
4070 " tsb->tsa.iostat.dev_act_time %d\n",
4071 tsb->tsa.iostat.dev_act_time);
4072 sense = tsb->tsa.iostat.sense;
4073 break;
4074 case 2: /* ts_ddpc */
4075 len += sprintf(page + len, PRINTK_HEADER
4076 " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4077 for (sl = 0; sl < 2; sl++) {
4078 len += sprintf(page + len, PRINTK_HEADER
4079 " tsb->tsa.ddpc.rcq %2d-%2d: ",
4080 (8 * sl), ((8 * sl) + 7));
4081 rcq = tsb->tsa.ddpc.rcq;
4082 for (sct = 0; sct < 8; sct++) {
4083 len += sprintf(page + len, " %02x",
4084 rcq[8 * sl + sct]);
4085 }
4086 len += sprintf(page + len, "\n");
4087 }
4088 sense = tsb->tsa.ddpc.sense;
4089 break;
4090 case 3: /* tsa_intrg */
4091 len += sprintf(page + len, PRINTK_HEADER
4092 " tsb->tsa.intrg.: not supportet yet\n");
4093 break;
4094 }
4095
4096 if (sense) {
4097 for (sl = 0; sl < 4; sl++) {
4098 len += sprintf(page + len, PRINTK_HEADER
4099 " Sense(hex) %2d-%2d:",
4100 (8 * sl), ((8 * sl) + 7));
4101 for (sct = 0; sct < 8; sct++) {
4102 len += sprintf(page + len, " %02x",
4103 sense[8 * sl + sct]);
4104 }
4105 len += sprintf(page + len, "\n");
4106 }
4107
4108 if (sense[27] & DASD_SENSE_BIT_0) {
4109 /* 24 Byte Sense Data */
4110 sprintf(page + len, PRINTK_HEADER
4111 " 24 Byte: %x MSG %x, "
4112 "%s MSGb to SYSOP\n",
4113 sense[7] >> 4, sense[7] & 0x0f,
4114 sense[1] & 0x10 ? "" : "no");
4115 } else {
4116 /* 32 Byte Sense Data */
4117 sprintf(page + len, PRINTK_HEADER
4118 " 32 Byte: Format: %x "
4119 "Exception class %x\n",
4120 sense[6] & 0x0f, sense[22] >> 4);
4121 }
4122 } else {
4123 sprintf(page + len, PRINTK_HEADER
4124 " SORRY - NO VALID SENSE AVAILABLE\n");
4125 }
4126 } else {
4127 sprintf(page + len, PRINTK_HEADER
4128 " SORRY - NO TSB DATA AVAILABLE\n");
4129 }
4130 printk(KERN_ERR "%s", page);
4131 free_page((unsigned long) page);
4132 }
4133
4134 static void dasd_eckd_dump_sense(struct dasd_device *device,
4135 struct dasd_ccw_req *req, struct irb *irb)
4136 {
4137 if (scsw_is_tm(&irb->scsw))
4138 dasd_eckd_dump_sense_tcw(device, req, irb);
4139 else
4140 dasd_eckd_dump_sense_ccw(device, req, irb);
4141 }
4142
4143 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4144 {
4145 /*
4146 * the device should be disconnected from our LCU structure
4147 * on restore we will reconnect it and reread LCU specific
4148 * information like PAV support that might have changed
4149 */
4150 dasd_alias_remove_device(device);
4151 dasd_alias_disconnect_device_from_lcu(device);
4152
4153 return 0;
4154 }
4155
4156 static int dasd_eckd_restore_device(struct dasd_device *device)
4157 {
4158 struct dasd_eckd_private *private;
4159 struct dasd_eckd_characteristics temp_rdc_data;
4160 int rc;
4161 struct dasd_uid temp_uid;
4162 unsigned long flags;
4163 unsigned long cqr_flags = 0;
4164
4165 private = (struct dasd_eckd_private *) device->private;
4166
4167 /* Read Configuration Data */
4168 dasd_eckd_read_conf(device);
4169
4170 dasd_eckd_get_uid(device, &temp_uid);
4171 /* Generate device unique id */
4172 rc = dasd_eckd_generate_uid(device);
4173 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4174 if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4175 dev_err(&device->cdev->dev, "The UID of the DASD has "
4176 "changed\n");
4177 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4178 if (rc)
4179 goto out_err;
4180
4181 /* register lcu with alias handling, enable PAV if this is a new lcu */
4182 rc = dasd_alias_make_device_known_to_lcu(device);
4183 if (rc)
4184 return rc;
4185
4186 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4187 dasd_eckd_validate_server(device, cqr_flags);
4188
4189 /* RE-Read Configuration Data */
4190 dasd_eckd_read_conf(device);
4191
4192 /* Read Feature Codes */
4193 dasd_eckd_read_features(device);
4194
4195 /* Read Device Characteristics */
4196 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4197 &temp_rdc_data, 64);
4198 if (rc) {
4199 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4200 "Read device characteristic failed, rc=%d", rc);
4201 goto out_err;
4202 }
4203 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4204 memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4205 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4206
4207 /* add device to alias management */
4208 dasd_alias_add_device(device);
4209
4210 return 0;
4211
4212 out_err:
4213 return -1;
4214 }
4215
4216 static int dasd_eckd_reload_device(struct dasd_device *device)
4217 {
4218 struct dasd_eckd_private *private;
4219 int rc, old_base;
4220 char print_uid[60];
4221 struct dasd_uid uid;
4222 unsigned long flags;
4223
4224 private = (struct dasd_eckd_private *) device->private;
4225
4226 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4227 old_base = private->uid.base_unit_addr;
4228 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4229
4230 /* Read Configuration Data */
4231 rc = dasd_eckd_read_conf(device);
4232 if (rc)
4233 goto out_err;
4234
4235 rc = dasd_eckd_generate_uid(device);
4236 if (rc)
4237 goto out_err;
4238 /*
4239 * update unit address configuration and
4240 * add device to alias management
4241 */
4242 dasd_alias_update_add_device(device);
4243
4244 dasd_eckd_get_uid(device, &uid);
4245
4246 if (old_base != uid.base_unit_addr) {
4247 if (strlen(uid.vduit) > 0)
4248 snprintf(print_uid, sizeof(print_uid),
4249 "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4250 uid.ssid, uid.base_unit_addr, uid.vduit);
4251 else
4252 snprintf(print_uid, sizeof(print_uid),
4253 "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4254 uid.ssid, uid.base_unit_addr);
4255
4256 dev_info(&device->cdev->dev,
4257 "An Alias device was reassigned to a new base device "
4258 "with UID: %s\n", print_uid);
4259 }
4260 return 0;
4261
4262 out_err:
4263 return -1;
4264 }
4265
4266 static struct ccw_driver dasd_eckd_driver = {
4267 .driver = {
4268 .name = "dasd-eckd",
4269 .owner = THIS_MODULE,
4270 },
4271 .ids = dasd_eckd_ids,
4272 .probe = dasd_eckd_probe,
4273 .remove = dasd_generic_remove,
4274 .set_offline = dasd_generic_set_offline,
4275 .set_online = dasd_eckd_set_online,
4276 .notify = dasd_generic_notify,
4277 .path_event = dasd_generic_path_event,
4278 .shutdown = dasd_generic_shutdown,
4279 .freeze = dasd_generic_pm_freeze,
4280 .thaw = dasd_generic_restore_device,
4281 .restore = dasd_generic_restore_device,
4282 .uc_handler = dasd_generic_uc_handler,
4283 .int_class = IRQIO_DAS,
4284 };
4285
4286 /*
4287 * max_blocks is dependent on the amount of storage that is available
4288 * in the static io buffer for each device. Currently each device has
4289 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4290 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4291 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4292 * addition we have one define extent ccw + 16 bytes of data and one
4293 * locate record ccw + 16 bytes of data. That makes:
4294 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4295 * We want to fit two into the available memory so that we can immediately
4296 * start the next request if one finishes off. That makes 249.5 blocks
4297 * for one request. Give a little safety and the result is 240.
4298 */
4299 static struct dasd_discipline dasd_eckd_discipline = {
4300 .owner = THIS_MODULE,
4301 .name = "ECKD",
4302 .ebcname = "ECKD",
4303 .max_blocks = 190,
4304 .check_device = dasd_eckd_check_characteristics,
4305 .uncheck_device = dasd_eckd_uncheck_device,
4306 .do_analysis = dasd_eckd_do_analysis,
4307 .verify_path = dasd_eckd_verify_path,
4308 .ready_to_online = dasd_eckd_ready_to_online,
4309 .online_to_ready = dasd_eckd_online_to_ready,
4310 .fill_geometry = dasd_eckd_fill_geometry,
4311 .start_IO = dasd_start_IO,
4312 .term_IO = dasd_term_IO,
4313 .handle_terminated_request = dasd_eckd_handle_terminated_request,
4314 .format_device = dasd_eckd_format_device,
4315 .erp_action = dasd_eckd_erp_action,
4316 .erp_postaction = dasd_eckd_erp_postaction,
4317 .check_for_device_change = dasd_eckd_check_for_device_change,
4318 .build_cp = dasd_eckd_build_alias_cp,
4319 .free_cp = dasd_eckd_free_alias_cp,
4320 .dump_sense = dasd_eckd_dump_sense,
4321 .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4322 .fill_info = dasd_eckd_fill_info,
4323 .ioctl = dasd_eckd_ioctl,
4324 .freeze = dasd_eckd_pm_freeze,
4325 .restore = dasd_eckd_restore_device,
4326 .reload = dasd_eckd_reload_device,
4327 .get_uid = dasd_eckd_get_uid,
4328 .kick_validate = dasd_eckd_kick_validate_server,
4329 };
4330
4331 static int __init
4332 dasd_eckd_init(void)
4333 {
4334 int ret;
4335
4336 ASCEBC(dasd_eckd_discipline.ebcname, 4);
4337 dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4338 GFP_KERNEL | GFP_DMA);
4339 if (!dasd_reserve_req)
4340 return -ENOMEM;
4341 path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4342 GFP_KERNEL | GFP_DMA);
4343 if (!path_verification_worker) {
4344 kfree(dasd_reserve_req);
4345 return -ENOMEM;
4346 }
4347 ret = ccw_driver_register(&dasd_eckd_driver);
4348 if (!ret)
4349 wait_for_device_probe();
4350 else {
4351 kfree(path_verification_worker);
4352 kfree(dasd_reserve_req);
4353 }
4354 return ret;
4355 }
4356
4357 static void __exit
4358 dasd_eckd_cleanup(void)
4359 {
4360 ccw_driver_unregister(&dasd_eckd_driver);
4361 kfree(path_verification_worker);
4362 kfree(dasd_reserve_req);
4363 }
4364
4365 module_init(dasd_eckd_init);
4366 module_exit(dasd_eckd_cleanup);
Linux kernel - Deliverables
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