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Bluetooth: hci_uart: Use generic functionality from Broadcom module
[linux/fpc-iii.git] / drivers / s390 / block / dasd_eckd.c
blobd47f5b99623a1e4913f6a8d1b9571e18cf5968f1
1 /*
2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Carsten Otte <Cotte@de.ibm.com>
5 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
7 * Copyright IBM Corp. 1999, 2009
8 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
9 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
10 */
11
12 #define KMSG_COMPONENT "dasd-eckd"
13
14 #include <linux/stddef.h>
15 #include <linux/kernel.h>
16 #include <linux/slab.h>
17 #include <linux/hdreg.h> /* HDIO_GETGEO */
18 #include <linux/bio.h>
19 #include <linux/module.h>
20 #include <linux/compat.h>
21 #include <linux/init.h>
22
23 #include <asm/css_chars.h>
24 #include <asm/debug.h>
25 #include <asm/idals.h>
26 #include <asm/ebcdic.h>
27 #include <asm/io.h>
28 #include <asm/uaccess.h>
29 #include <asm/cio.h>
30 #include <asm/ccwdev.h>
31 #include <asm/itcw.h>
32 #include <asm/schid.h>
33 #include <asm/chpid.h>
34
35 #include "dasd_int.h"
36 #include "dasd_eckd.h"
37
38 #ifdef PRINTK_HEADER
39 #undef PRINTK_HEADER
40 #endif /* PRINTK_HEADER */
41 #define PRINTK_HEADER "dasd(eckd):"
42
43 #define ECKD_C0(i) (i->home_bytes)
44 #define ECKD_F(i) (i->formula)
45 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
46 (i->factors.f_0x02.f1))
47 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
48 (i->factors.f_0x02.f2))
49 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
50 (i->factors.f_0x02.f3))
51 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
52 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
53 #define ECKD_F6(i) (i->factor6)
54 #define ECKD_F7(i) (i->factor7)
55 #define ECKD_F8(i) (i->factor8)
56
57 /*
58 * raw track access always map to 64k in memory
59 * so it maps to 16 blocks of 4k per track
60 */
61 #define DASD_RAW_BLOCK_PER_TRACK 16
62 #define DASD_RAW_BLOCKSIZE 4096
63 /* 64k are 128 x 512 byte sectors */
64 #define DASD_RAW_SECTORS_PER_TRACK 128
65
66 MODULE_LICENSE("GPL");
67
68 static struct dasd_discipline dasd_eckd_discipline;
69
70 /* The ccw bus type uses this table to find devices that it sends to
71 * dasd_eckd_probe */
72 static struct ccw_device_id dasd_eckd_ids[] = {
73 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
74 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
75 { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
76 { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
77 { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
78 { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
79 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
80 { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
81 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
82 { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
83 { /* end of list */ },
84 };
85
86 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
87
88 static struct ccw_driver dasd_eckd_driver; /* see below */
89
90 static void *rawpadpage;
91
92 #define INIT_CQR_OK 0
93 #define INIT_CQR_UNFORMATTED 1
94 #define INIT_CQR_ERROR 2
95
96 /* emergency request for reserve/release */
97 static struct {
98 struct dasd_ccw_req cqr;
99 struct ccw1 ccw;
100 char data[32];
101 } *dasd_reserve_req;
102 static DEFINE_MUTEX(dasd_reserve_mutex);
103
104 /* definitions for the path verification worker */
105 struct path_verification_work_data {
106 struct work_struct worker;
107 struct dasd_device *device;
108 struct dasd_ccw_req cqr;
109 struct ccw1 ccw;
110 __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
111 int isglobal;
112 __u8 tbvpm;
113 };
114 static struct path_verification_work_data *path_verification_worker;
115 static DEFINE_MUTEX(dasd_path_verification_mutex);
116
117 struct check_attention_work_data {
118 struct work_struct worker;
119 struct dasd_device *device;
120 __u8 lpum;
121 };
122
123 /* initial attempt at a probe function. this can be simplified once
124 * the other detection code is gone */
125 static int
126 dasd_eckd_probe (struct ccw_device *cdev)
127 {
128 int ret;
129
130 /* set ECKD specific ccw-device options */
131 ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
132 CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
133 if (ret) {
134 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
135 "dasd_eckd_probe: could not set "
136 "ccw-device options");
137 return ret;
138 }
139 ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
140 return ret;
141 }
142
143 static int
144 dasd_eckd_set_online(struct ccw_device *cdev)
145 {
146 return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
147 }
148
149 static const int sizes_trk0[] = { 28, 148, 84 };
150 #define LABEL_SIZE 140
151
152 /* head and record addresses of count_area read in analysis ccw */
153 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
154 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
155
156 static inline unsigned int
157 round_up_multiple(unsigned int no, unsigned int mult)
158 {
159 int rem = no % mult;
160 return (rem ? no - rem + mult : no);
161 }
162
163 static inline unsigned int
164 ceil_quot(unsigned int d1, unsigned int d2)
165 {
166 return (d1 + (d2 - 1)) / d2;
167 }
168
169 static unsigned int
170 recs_per_track(struct dasd_eckd_characteristics * rdc,
171 unsigned int kl, unsigned int dl)
172 {
173 int dn, kn;
174
175 switch (rdc->dev_type) {
176 case 0x3380:
177 if (kl)
178 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
179 ceil_quot(dl + 12, 32));
180 else
181 return 1499 / (15 + ceil_quot(dl + 12, 32));
182 case 0x3390:
183 dn = ceil_quot(dl + 6, 232) + 1;
184 if (kl) {
185 kn = ceil_quot(kl + 6, 232) + 1;
186 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
187 9 + ceil_quot(dl + 6 * dn, 34));
188 } else
189 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
190 case 0x9345:
191 dn = ceil_quot(dl + 6, 232) + 1;
192 if (kl) {
193 kn = ceil_quot(kl + 6, 232) + 1;
194 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
195 ceil_quot(dl + 6 * dn, 34));
196 } else
197 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
198 }
199 return 0;
200 }
201
202 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
203 {
204 geo->cyl = (__u16) cyl;
205 geo->head = cyl >> 16;
206 geo->head <<= 4;
207 geo->head |= head;
208 }
209
210 static int
211 check_XRC (struct ccw1 *de_ccw,
212 struct DE_eckd_data *data,
213 struct dasd_device *device)
214 {
215 struct dasd_eckd_private *private;
216 int rc;
217
218 private = (struct dasd_eckd_private *) device->private;
219 if (!private->rdc_data.facilities.XRC_supported)
220 return 0;
221
222 /* switch on System Time Stamp - needed for XRC Support */
223 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
224 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
225
226 rc = get_sync_clock(&data->ep_sys_time);
227 /* Ignore return code if sync clock is switched off. */
228 if (rc == -EOPNOTSUPP || rc == -EACCES)
229 rc = 0;
230
231 de_ccw->count = sizeof(struct DE_eckd_data);
232 de_ccw->flags |= CCW_FLAG_SLI;
233 return rc;
234 }
235
236 static int
237 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
238 unsigned int totrk, int cmd, struct dasd_device *device)
239 {
240 struct dasd_eckd_private *private;
241 u32 begcyl, endcyl;
242 u16 heads, beghead, endhead;
243 int rc = 0;
244
245 private = (struct dasd_eckd_private *) device->private;
246
247 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
248 ccw->flags = 0;
249 ccw->count = 16;
250 ccw->cda = (__u32) __pa(data);
251
252 memset(data, 0, sizeof(struct DE_eckd_data));
253 switch (cmd) {
254 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
255 case DASD_ECKD_CCW_READ_RECORD_ZERO:
256 case DASD_ECKD_CCW_READ:
257 case DASD_ECKD_CCW_READ_MT:
258 case DASD_ECKD_CCW_READ_CKD:
259 case DASD_ECKD_CCW_READ_CKD_MT:
260 case DASD_ECKD_CCW_READ_KD:
261 case DASD_ECKD_CCW_READ_KD_MT:
262 case DASD_ECKD_CCW_READ_COUNT:
263 data->mask.perm = 0x1;
264 data->attributes.operation = private->attrib.operation;
265 break;
266 case DASD_ECKD_CCW_WRITE:
267 case DASD_ECKD_CCW_WRITE_MT:
268 case DASD_ECKD_CCW_WRITE_KD:
269 case DASD_ECKD_CCW_WRITE_KD_MT:
270 data->mask.perm = 0x02;
271 data->attributes.operation = private->attrib.operation;
272 rc = check_XRC (ccw, data, device);
273 break;
274 case DASD_ECKD_CCW_WRITE_CKD:
275 case DASD_ECKD_CCW_WRITE_CKD_MT:
276 data->attributes.operation = DASD_BYPASS_CACHE;
277 rc = check_XRC (ccw, data, device);
278 break;
279 case DASD_ECKD_CCW_ERASE:
280 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
281 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
282 data->mask.perm = 0x3;
283 data->mask.auth = 0x1;
284 data->attributes.operation = DASD_BYPASS_CACHE;
285 rc = check_XRC (ccw, data, device);
286 break;
287 default:
288 dev_err(&device->cdev->dev,
289 "0x%x is not a known command\n", cmd);
290 break;
291 }
292
293 data->attributes.mode = 0x3; /* ECKD */
294
295 if ((private->rdc_data.cu_type == 0x2105 ||
296 private->rdc_data.cu_type == 0x2107 ||
297 private->rdc_data.cu_type == 0x1750)
298 && !(private->uses_cdl && trk < 2))
299 data->ga_extended |= 0x40; /* Regular Data Format Mode */
300
301 heads = private->rdc_data.trk_per_cyl;
302 begcyl = trk / heads;
303 beghead = trk % heads;
304 endcyl = totrk / heads;
305 endhead = totrk % heads;
306
307 /* check for sequential prestage - enhance cylinder range */
308 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
309 data->attributes.operation == DASD_SEQ_ACCESS) {
310
311 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
312 endcyl += private->attrib.nr_cyl;
313 else
314 endcyl = (private->real_cyl - 1);
315 }
316
317 set_ch_t(&data->beg_ext, begcyl, beghead);
318 set_ch_t(&data->end_ext, endcyl, endhead);
319 return rc;
320 }
321
322 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
323 struct dasd_device *device)
324 {
325 struct dasd_eckd_private *private;
326 int rc;
327
328 private = (struct dasd_eckd_private *) device->private;
329 if (!private->rdc_data.facilities.XRC_supported)
330 return 0;
331
332 /* switch on System Time Stamp - needed for XRC Support */
333 pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid' */
334 pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
335 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
336
337 rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
338 /* Ignore return code if sync clock is switched off. */
339 if (rc == -EOPNOTSUPP || rc == -EACCES)
340 rc = 0;
341 return rc;
342 }
343
344 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
345 unsigned int rec_on_trk, int count, int cmd,
346 struct dasd_device *device, unsigned int reclen,
347 unsigned int tlf)
348 {
349 struct dasd_eckd_private *private;
350 int sector;
351 int dn, d;
352
353 private = (struct dasd_eckd_private *) device->private;
354
355 memset(data, 0, sizeof(*data));
356 sector = 0;
357 if (rec_on_trk) {
358 switch (private->rdc_data.dev_type) {
359 case 0x3390:
360 dn = ceil_quot(reclen + 6, 232);
361 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
362 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
363 break;
364 case 0x3380:
365 d = 7 + ceil_quot(reclen + 12, 32);
366 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
367 break;
368 }
369 }
370 data->sector = sector;
371 /* note: meaning of count depends on the operation
372 * for record based I/O it's the number of records, but for
373 * track based I/O it's the number of tracks
374 */
375 data->count = count;
376 switch (cmd) {
377 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
378 data->operation.orientation = 0x3;
379 data->operation.operation = 0x03;
380 break;
381 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
382 data->operation.orientation = 0x3;
383 data->operation.operation = 0x16;
384 break;
385 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
386 data->operation.orientation = 0x1;
387 data->operation.operation = 0x03;
388 data->count++;
389 break;
390 case DASD_ECKD_CCW_READ_RECORD_ZERO:
391 data->operation.orientation = 0x3;
392 data->operation.operation = 0x16;
393 data->count++;
394 break;
395 case DASD_ECKD_CCW_WRITE:
396 case DASD_ECKD_CCW_WRITE_MT:
397 case DASD_ECKD_CCW_WRITE_KD:
398 case DASD_ECKD_CCW_WRITE_KD_MT:
399 data->auxiliary.length_valid = 0x1;
400 data->length = reclen;
401 data->operation.operation = 0x01;
402 break;
403 case DASD_ECKD_CCW_WRITE_CKD:
404 case DASD_ECKD_CCW_WRITE_CKD_MT:
405 data->auxiliary.length_valid = 0x1;
406 data->length = reclen;
407 data->operation.operation = 0x03;
408 break;
409 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
410 data->operation.orientation = 0x0;
411 data->operation.operation = 0x3F;
412 data->extended_operation = 0x11;
413 data->length = 0;
414 data->extended_parameter_length = 0x02;
415 if (data->count > 8) {
416 data->extended_parameter[0] = 0xFF;
417 data->extended_parameter[1] = 0xFF;
418 data->extended_parameter[1] <<= (16 - count);
419 } else {
420 data->extended_parameter[0] = 0xFF;
421 data->extended_parameter[0] <<= (8 - count);
422 data->extended_parameter[1] = 0x00;
423 }
424 data->sector = 0xFF;
425 break;
426 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
427 data->auxiliary.length_valid = 0x1;
428 data->length = reclen; /* not tlf, as one might think */
429 data->operation.operation = 0x3F;
430 data->extended_operation = 0x23;
431 break;
432 case DASD_ECKD_CCW_READ:
433 case DASD_ECKD_CCW_READ_MT:
434 case DASD_ECKD_CCW_READ_KD:
435 case DASD_ECKD_CCW_READ_KD_MT:
436 data->auxiliary.length_valid = 0x1;
437 data->length = reclen;
438 data->operation.operation = 0x06;
439 break;
440 case DASD_ECKD_CCW_READ_CKD:
441 case DASD_ECKD_CCW_READ_CKD_MT:
442 data->auxiliary.length_valid = 0x1;
443 data->length = reclen;
444 data->operation.operation = 0x16;
445 break;
446 case DASD_ECKD_CCW_READ_COUNT:
447 data->operation.operation = 0x06;
448 break;
449 case DASD_ECKD_CCW_READ_TRACK:
450 data->operation.orientation = 0x1;
451 data->operation.operation = 0x0C;
452 data->extended_parameter_length = 0;
453 data->sector = 0xFF;
454 break;
455 case DASD_ECKD_CCW_READ_TRACK_DATA:
456 data->auxiliary.length_valid = 0x1;
457 data->length = tlf;
458 data->operation.operation = 0x0C;
459 break;
460 case DASD_ECKD_CCW_ERASE:
461 data->length = reclen;
462 data->auxiliary.length_valid = 0x1;
463 data->operation.operation = 0x0b;
464 break;
465 default:
466 DBF_DEV_EVENT(DBF_ERR, device,
467 "fill LRE unknown opcode 0x%x", cmd);
468 BUG();
469 }
470 set_ch_t(&data->seek_addr,
471 trk / private->rdc_data.trk_per_cyl,
472 trk % private->rdc_data.trk_per_cyl);
473 data->search_arg.cyl = data->seek_addr.cyl;
474 data->search_arg.head = data->seek_addr.head;
475 data->search_arg.record = rec_on_trk;
476 }
477
478 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
479 unsigned int trk, unsigned int totrk, int cmd,
480 struct dasd_device *basedev, struct dasd_device *startdev,
481 unsigned char format, unsigned int rec_on_trk, int count,
482 unsigned int blksize, unsigned int tlf)
483 {
484 struct dasd_eckd_private *basepriv, *startpriv;
485 struct DE_eckd_data *dedata;
486 struct LRE_eckd_data *lredata;
487 u32 begcyl, endcyl;
488 u16 heads, beghead, endhead;
489 int rc = 0;
490
491 basepriv = (struct dasd_eckd_private *) basedev->private;
492 startpriv = (struct dasd_eckd_private *) startdev->private;
493 dedata = &pfxdata->define_extent;
494 lredata = &pfxdata->locate_record;
495
496 ccw->cmd_code = DASD_ECKD_CCW_PFX;
497 ccw->flags = 0;
498 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
499 ccw->count = sizeof(*pfxdata) + 2;
500 ccw->cda = (__u32) __pa(pfxdata);
501 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
502 } else {
503 ccw->count = sizeof(*pfxdata);
504 ccw->cda = (__u32) __pa(pfxdata);
505 memset(pfxdata, 0, sizeof(*pfxdata));
506 }
507
508 /* prefix data */
509 if (format > 1) {
510 DBF_DEV_EVENT(DBF_ERR, basedev,
511 "PFX LRE unknown format 0x%x", format);
512 BUG();
513 return -EINVAL;
514 }
515 pfxdata->format = format;
516 pfxdata->base_address = basepriv->ned->unit_addr;
517 pfxdata->base_lss = basepriv->ned->ID;
518 pfxdata->validity.define_extent = 1;
519
520 /* private uid is kept up to date, conf_data may be outdated */
521 if (startpriv->uid.type != UA_BASE_DEVICE) {
522 pfxdata->validity.verify_base = 1;
523 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
524 pfxdata->validity.hyper_pav = 1;
525 }
526
527 /* define extend data (mostly)*/
528 switch (cmd) {
529 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
530 case DASD_ECKD_CCW_READ_RECORD_ZERO:
531 case DASD_ECKD_CCW_READ:
532 case DASD_ECKD_CCW_READ_MT:
533 case DASD_ECKD_CCW_READ_CKD:
534 case DASD_ECKD_CCW_READ_CKD_MT:
535 case DASD_ECKD_CCW_READ_KD:
536 case DASD_ECKD_CCW_READ_KD_MT:
537 case DASD_ECKD_CCW_READ_COUNT:
538 dedata->mask.perm = 0x1;
539 dedata->attributes.operation = basepriv->attrib.operation;
540 break;
541 case DASD_ECKD_CCW_READ_TRACK:
542 case DASD_ECKD_CCW_READ_TRACK_DATA:
543 dedata->mask.perm = 0x1;
544 dedata->attributes.operation = basepriv->attrib.operation;
545 dedata->blk_size = 0;
546 break;
547 case DASD_ECKD_CCW_WRITE:
548 case DASD_ECKD_CCW_WRITE_MT:
549 case DASD_ECKD_CCW_WRITE_KD:
550 case DASD_ECKD_CCW_WRITE_KD_MT:
551 dedata->mask.perm = 0x02;
552 dedata->attributes.operation = basepriv->attrib.operation;
553 rc = check_XRC_on_prefix(pfxdata, basedev);
554 break;
555 case DASD_ECKD_CCW_WRITE_CKD:
556 case DASD_ECKD_CCW_WRITE_CKD_MT:
557 dedata->attributes.operation = DASD_BYPASS_CACHE;
558 rc = check_XRC_on_prefix(pfxdata, basedev);
559 break;
560 case DASD_ECKD_CCW_ERASE:
561 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
562 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
563 dedata->mask.perm = 0x3;
564 dedata->mask.auth = 0x1;
565 dedata->attributes.operation = DASD_BYPASS_CACHE;
566 rc = check_XRC_on_prefix(pfxdata, basedev);
567 break;
568 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
569 dedata->mask.perm = 0x03;
570 dedata->attributes.operation = basepriv->attrib.operation;
571 dedata->blk_size = 0;
572 break;
573 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
574 dedata->mask.perm = 0x02;
575 dedata->attributes.operation = basepriv->attrib.operation;
576 dedata->blk_size = blksize;
577 rc = check_XRC_on_prefix(pfxdata, basedev);
578 break;
579 default:
580 DBF_DEV_EVENT(DBF_ERR, basedev,
581 "PFX LRE unknown opcode 0x%x", cmd);
582 BUG();
583 return -EINVAL;
584 }
585
586 dedata->attributes.mode = 0x3; /* ECKD */
587
588 if ((basepriv->rdc_data.cu_type == 0x2105 ||
589 basepriv->rdc_data.cu_type == 0x2107 ||
590 basepriv->rdc_data.cu_type == 0x1750)
591 && !(basepriv->uses_cdl && trk < 2))
592 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
593
594 heads = basepriv->rdc_data.trk_per_cyl;
595 begcyl = trk / heads;
596 beghead = trk % heads;
597 endcyl = totrk / heads;
598 endhead = totrk % heads;
599
600 /* check for sequential prestage - enhance cylinder range */
601 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
602 dedata->attributes.operation == DASD_SEQ_ACCESS) {
603
604 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
605 endcyl += basepriv->attrib.nr_cyl;
606 else
607 endcyl = (basepriv->real_cyl - 1);
608 }
609
610 set_ch_t(&dedata->beg_ext, begcyl, beghead);
611 set_ch_t(&dedata->end_ext, endcyl, endhead);
612
613 if (format == 1) {
614 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
615 basedev, blksize, tlf);
616 }
617
618 return rc;
619 }
620
621 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
622 unsigned int trk, unsigned int totrk, int cmd,
623 struct dasd_device *basedev, struct dasd_device *startdev)
624 {
625 return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
626 0, 0, 0, 0, 0);
627 }
628
629 static void
630 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
631 unsigned int rec_on_trk, int no_rec, int cmd,
632 struct dasd_device * device, int reclen)
633 {
634 struct dasd_eckd_private *private;
635 int sector;
636 int dn, d;
637
638 private = (struct dasd_eckd_private *) device->private;
639
640 DBF_DEV_EVENT(DBF_INFO, device,
641 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
642 trk, rec_on_trk, no_rec, cmd, reclen);
643
644 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
645 ccw->flags = 0;
646 ccw->count = 16;
647 ccw->cda = (__u32) __pa(data);
648
649 memset(data, 0, sizeof(struct LO_eckd_data));
650 sector = 0;
651 if (rec_on_trk) {
652 switch (private->rdc_data.dev_type) {
653 case 0x3390:
654 dn = ceil_quot(reclen + 6, 232);
655 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
656 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
657 break;
658 case 0x3380:
659 d = 7 + ceil_quot(reclen + 12, 32);
660 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
661 break;
662 }
663 }
664 data->sector = sector;
665 data->count = no_rec;
666 switch (cmd) {
667 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
668 data->operation.orientation = 0x3;
669 data->operation.operation = 0x03;
670 break;
671 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
672 data->operation.orientation = 0x3;
673 data->operation.operation = 0x16;
674 break;
675 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
676 data->operation.orientation = 0x1;
677 data->operation.operation = 0x03;
678 data->count++;
679 break;
680 case DASD_ECKD_CCW_READ_RECORD_ZERO:
681 data->operation.orientation = 0x3;
682 data->operation.operation = 0x16;
683 data->count++;
684 break;
685 case DASD_ECKD_CCW_WRITE:
686 case DASD_ECKD_CCW_WRITE_MT:
687 case DASD_ECKD_CCW_WRITE_KD:
688 case DASD_ECKD_CCW_WRITE_KD_MT:
689 data->auxiliary.last_bytes_used = 0x1;
690 data->length = reclen;
691 data->operation.operation = 0x01;
692 break;
693 case DASD_ECKD_CCW_WRITE_CKD:
694 case DASD_ECKD_CCW_WRITE_CKD_MT:
695 data->auxiliary.last_bytes_used = 0x1;
696 data->length = reclen;
697 data->operation.operation = 0x03;
698 break;
699 case DASD_ECKD_CCW_READ:
700 case DASD_ECKD_CCW_READ_MT:
701 case DASD_ECKD_CCW_READ_KD:
702 case DASD_ECKD_CCW_READ_KD_MT:
703 data->auxiliary.last_bytes_used = 0x1;
704 data->length = reclen;
705 data->operation.operation = 0x06;
706 break;
707 case DASD_ECKD_CCW_READ_CKD:
708 case DASD_ECKD_CCW_READ_CKD_MT:
709 data->auxiliary.last_bytes_used = 0x1;
710 data->length = reclen;
711 data->operation.operation = 0x16;
712 break;
713 case DASD_ECKD_CCW_READ_COUNT:
714 data->operation.operation = 0x06;
715 break;
716 case DASD_ECKD_CCW_ERASE:
717 data->length = reclen;
718 data->auxiliary.last_bytes_used = 0x1;
719 data->operation.operation = 0x0b;
720 break;
721 default:
722 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
723 "opcode 0x%x", cmd);
724 }
725 set_ch_t(&data->seek_addr,
726 trk / private->rdc_data.trk_per_cyl,
727 trk % private->rdc_data.trk_per_cyl);
728 data->search_arg.cyl = data->seek_addr.cyl;
729 data->search_arg.head = data->seek_addr.head;
730 data->search_arg.record = rec_on_trk;
731 }
732
733 /*
734 * Returns 1 if the block is one of the special blocks that needs
735 * to get read/written with the KD variant of the command.
736 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
737 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
738 * Luckily the KD variants differ only by one bit (0x08) from the
739 * normal variant. So don't wonder about code like:
740 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
741 * ccw->cmd_code |= 0x8;
742 */
743 static inline int
744 dasd_eckd_cdl_special(int blk_per_trk, int recid)
745 {
746 if (recid < 3)
747 return 1;
748 if (recid < blk_per_trk)
749 return 0;
750 if (recid < 2 * blk_per_trk)
751 return 1;
752 return 0;
753 }
754
755 /*
756 * Returns the record size for the special blocks of the cdl format.
757 * Only returns something useful if dasd_eckd_cdl_special is true
758 * for the recid.
759 */
760 static inline int
761 dasd_eckd_cdl_reclen(int recid)
762 {
763 if (recid < 3)
764 return sizes_trk0[recid];
765 return LABEL_SIZE;
766 }
767 /* create unique id from private structure. */
768 static void create_uid(struct dasd_eckd_private *private)
769 {
770 int count;
771 struct dasd_uid *uid;
772
773 uid = &private->uid;
774 memset(uid, 0, sizeof(struct dasd_uid));
775 memcpy(uid->vendor, private->ned->HDA_manufacturer,
776 sizeof(uid->vendor) - 1);
777 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
778 memcpy(uid->serial, private->ned->HDA_location,
779 sizeof(uid->serial) - 1);
780 EBCASC(uid->serial, sizeof(uid->serial) - 1);
781 uid->ssid = private->gneq->subsystemID;
782 uid->real_unit_addr = private->ned->unit_addr;
783 if (private->sneq) {
784 uid->type = private->sneq->sua_flags;
785 if (uid->type == UA_BASE_PAV_ALIAS)
786 uid->base_unit_addr = private->sneq->base_unit_addr;
787 } else {
788 uid->type = UA_BASE_DEVICE;
789 }
790 if (private->vdsneq) {
791 for (count = 0; count < 16; count++) {
792 sprintf(uid->vduit+2*count, "%02x",
793 private->vdsneq->uit[count]);
794 }
795 }
796 }
797
798 /*
799 * Generate device unique id that specifies the physical device.
800 */
801 static int dasd_eckd_generate_uid(struct dasd_device *device)
802 {
803 struct dasd_eckd_private *private;
804 unsigned long flags;
805
806 private = (struct dasd_eckd_private *) device->private;
807 if (!private)
808 return -ENODEV;
809 if (!private->ned || !private->gneq)
810 return -ENODEV;
811 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
812 create_uid(private);
813 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
814 return 0;
815 }
816
817 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
818 {
819 struct dasd_eckd_private *private;
820 unsigned long flags;
821
822 if (device->private) {
823 private = (struct dasd_eckd_private *)device->private;
824 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
825 *uid = private->uid;
826 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
827 return 0;
828 }
829 return -EINVAL;
830 }
831
832 /*
833 * compare device UID with data of a given dasd_eckd_private structure
834 * return 0 for match
835 */
836 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
837 struct dasd_eckd_private *private)
838 {
839 struct dasd_uid device_uid;
840
841 create_uid(private);
842 dasd_eckd_get_uid(device, &device_uid);
843
844 return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
845 }
846
847 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
848 struct dasd_ccw_req *cqr,
849 __u8 *rcd_buffer,
850 __u8 lpm)
851 {
852 struct ccw1 *ccw;
853 /*
854 * buffer has to start with EBCDIC "V1.0" to show
855 * support for virtual device SNEQ
856 */
857 rcd_buffer[0] = 0xE5;
858 rcd_buffer[1] = 0xF1;
859 rcd_buffer[2] = 0x4B;
860 rcd_buffer[3] = 0xF0;
861
862 ccw = cqr->cpaddr;
863 ccw->cmd_code = DASD_ECKD_CCW_RCD;
864 ccw->flags = 0;
865 ccw->cda = (__u32)(addr_t)rcd_buffer;
866 ccw->count = DASD_ECKD_RCD_DATA_SIZE;
867 cqr->magic = DASD_ECKD_MAGIC;
868
869 cqr->startdev = device;
870 cqr->memdev = device;
871 cqr->block = NULL;
872 cqr->expires = 10*HZ;
873 cqr->lpm = lpm;
874 cqr->retries = 256;
875 cqr->buildclk = get_tod_clock();
876 cqr->status = DASD_CQR_FILLED;
877 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
878 }
879
880 /*
881 * Wakeup helper for read_conf
882 * if the cqr is not done and needs some error recovery
883 * the buffer has to be re-initialized with the EBCDIC "V1.0"
884 * to show support for virtual device SNEQ
885 */
886 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
887 {
888 struct ccw1 *ccw;
889 __u8 *rcd_buffer;
890
891 if (cqr->status != DASD_CQR_DONE) {
892 ccw = cqr->cpaddr;
893 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
894 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
895
896 rcd_buffer[0] = 0xE5;
897 rcd_buffer[1] = 0xF1;
898 rcd_buffer[2] = 0x4B;
899 rcd_buffer[3] = 0xF0;
900 }
901 dasd_wakeup_cb(cqr, data);
902 }
903
904 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
905 struct dasd_ccw_req *cqr,
906 __u8 *rcd_buffer,
907 __u8 lpm)
908 {
909 struct ciw *ciw;
910 int rc;
911 /*
912 * sanity check: scan for RCD command in extended SenseID data
913 * some devices do not support RCD
914 */
915 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
916 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
917 return -EOPNOTSUPP;
918
919 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
920 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
921 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
922 cqr->retries = 5;
923 cqr->callback = read_conf_cb;
924 rc = dasd_sleep_on_immediatly(cqr);
925 return rc;
926 }
927
928 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
929 void **rcd_buffer,
930 int *rcd_buffer_size, __u8 lpm)
931 {
932 struct ciw *ciw;
933 char *rcd_buf = NULL;
934 int ret;
935 struct dasd_ccw_req *cqr;
936
937 /*
938 * sanity check: scan for RCD command in extended SenseID data
939 * some devices do not support RCD
940 */
941 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
942 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
943 ret = -EOPNOTSUPP;
944 goto out_error;
945 }
946 rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
947 if (!rcd_buf) {
948 ret = -ENOMEM;
949 goto out_error;
950 }
951 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
952 0, /* use rcd_buf as data ara */
953 device);
954 if (IS_ERR(cqr)) {
955 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
956 "Could not allocate RCD request");
957 ret = -ENOMEM;
958 goto out_error;
959 }
960 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
961 cqr->callback = read_conf_cb;
962 ret = dasd_sleep_on(cqr);
963 /*
964 * on success we update the user input parms
965 */
966 dasd_sfree_request(cqr, cqr->memdev);
967 if (ret)
968 goto out_error;
969
970 *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
971 *rcd_buffer = rcd_buf;
972 return 0;
973 out_error:
974 kfree(rcd_buf);
975 *rcd_buffer = NULL;
976 *rcd_buffer_size = 0;
977 return ret;
978 }
979
980 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
981 {
982
983 struct dasd_sneq *sneq;
984 int i, count;
985
986 private->ned = NULL;
987 private->sneq = NULL;
988 private->vdsneq = NULL;
989 private->gneq = NULL;
990 count = private->conf_len / sizeof(struct dasd_sneq);
991 sneq = (struct dasd_sneq *)private->conf_data;
992 for (i = 0; i < count; ++i) {
993 if (sneq->flags.identifier == 1 && sneq->format == 1)
994 private->sneq = sneq;
995 else if (sneq->flags.identifier == 1 && sneq->format == 4)
996 private->vdsneq = (struct vd_sneq *)sneq;
997 else if (sneq->flags.identifier == 2)
998 private->gneq = (struct dasd_gneq *)sneq;
999 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
1000 private->ned = (struct dasd_ned *)sneq;
1001 sneq++;
1002 }
1003 if (!private->ned || !private->gneq) {
1004 private->ned = NULL;
1005 private->sneq = NULL;
1006 private->vdsneq = NULL;
1007 private->gneq = NULL;
1008 return -EINVAL;
1009 }
1010 return 0;
1011
1012 };
1013
1014 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1015 {
1016 struct dasd_gneq *gneq;
1017 int i, count, found;
1018
1019 count = conf_len / sizeof(*gneq);
1020 gneq = (struct dasd_gneq *)conf_data;
1021 found = 0;
1022 for (i = 0; i < count; ++i) {
1023 if (gneq->flags.identifier == 2) {
1024 found = 1;
1025 break;
1026 }
1027 gneq++;
1028 }
1029 if (found)
1030 return ((char *)gneq)[18] & 0x07;
1031 else
1032 return 0;
1033 }
1034
1035 static int dasd_eckd_read_conf(struct dasd_device *device)
1036 {
1037 void *conf_data;
1038 int conf_len, conf_data_saved;
1039 int rc, path_err;
1040 __u8 lpm, opm;
1041 struct dasd_eckd_private *private, path_private;
1042 struct dasd_path *path_data;
1043 struct dasd_uid *uid;
1044 char print_path_uid[60], print_device_uid[60];
1045
1046 private = (struct dasd_eckd_private *) device->private;
1047 path_data = &device->path_data;
1048 opm = ccw_device_get_path_mask(device->cdev);
1049 conf_data_saved = 0;
1050 path_err = 0;
1051 /* get configuration data per operational path */
1052 for (lpm = 0x80; lpm; lpm>>= 1) {
1053 if (!(lpm & opm))
1054 continue;
1055 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1056 &conf_len, lpm);
1057 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
1058 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1059 "Read configuration data returned "
1060 "error %d", rc);
1061 return rc;
1062 }
1063 if (conf_data == NULL) {
1064 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1065 "No configuration data "
1066 "retrieved");
1067 /* no further analysis possible */
1068 path_data->opm |= lpm;
1069 continue; /* no error */
1070 }
1071 /* save first valid configuration data */
1072 if (!conf_data_saved) {
1073 kfree(private->conf_data);
1074 private->conf_data = conf_data;
1075 private->conf_len = conf_len;
1076 if (dasd_eckd_identify_conf_parts(private)) {
1077 private->conf_data = NULL;
1078 private->conf_len = 0;
1079 kfree(conf_data);
1080 continue;
1081 }
1082 /*
1083 * build device UID that other path data
1084 * can be compared to it
1085 */
1086 dasd_eckd_generate_uid(device);
1087 conf_data_saved++;
1088 } else {
1089 path_private.conf_data = conf_data;
1090 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1091 if (dasd_eckd_identify_conf_parts(
1092 &path_private)) {
1093 path_private.conf_data = NULL;
1094 path_private.conf_len = 0;
1095 kfree(conf_data);
1096 continue;
1097 }
1098
1099 if (dasd_eckd_compare_path_uid(
1100 device, &path_private)) {
1101 uid = &path_private.uid;
1102 if (strlen(uid->vduit) > 0)
1103 snprintf(print_path_uid,
1104 sizeof(print_path_uid),
1105 "%s.%s.%04x.%02x.%s",
1106 uid->vendor, uid->serial,
1107 uid->ssid, uid->real_unit_addr,
1108 uid->vduit);
1109 else
1110 snprintf(print_path_uid,
1111 sizeof(print_path_uid),
1112 "%s.%s.%04x.%02x",
1113 uid->vendor, uid->serial,
1114 uid->ssid,
1115 uid->real_unit_addr);
1116 uid = &private->uid;
1117 if (strlen(uid->vduit) > 0)
1118 snprintf(print_device_uid,
1119 sizeof(print_device_uid),
1120 "%s.%s.%04x.%02x.%s",
1121 uid->vendor, uid->serial,
1122 uid->ssid, uid->real_unit_addr,
1123 uid->vduit);
1124 else
1125 snprintf(print_device_uid,
1126 sizeof(print_device_uid),
1127 "%s.%s.%04x.%02x",
1128 uid->vendor, uid->serial,
1129 uid->ssid,
1130 uid->real_unit_addr);
1131 dev_err(&device->cdev->dev,
1132 "Not all channel paths lead to "
1133 "the same device, path %02X leads to "
1134 "device %s instead of %s\n", lpm,
1135 print_path_uid, print_device_uid);
1136 path_err = -EINVAL;
1137 path_data->cablepm |= lpm;
1138 continue;
1139 }
1140
1141 path_private.conf_data = NULL;
1142 path_private.conf_len = 0;
1143 }
1144 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1145 case 0x02:
1146 path_data->npm |= lpm;
1147 break;
1148 case 0x03:
1149 path_data->ppm |= lpm;
1150 break;
1151 }
1152 path_data->opm |= lpm;
1153 /*
1154 * if the path is used
1155 * it should not be in one of the negative lists
1156 */
1157 path_data->cablepm &= ~lpm;
1158 path_data->hpfpm &= ~lpm;
1159 path_data->cuirpm &= ~lpm;
1160
1161 if (conf_data != private->conf_data)
1162 kfree(conf_data);
1163 }
1164
1165 return path_err;
1166 }
1167
1168 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1169 {
1170 struct dasd_eckd_private *private;
1171 int mdc;
1172 u32 fcx_max_data;
1173
1174 private = (struct dasd_eckd_private *) device->private;
1175 if (private->fcx_max_data) {
1176 mdc = ccw_device_get_mdc(device->cdev, lpm);
1177 if ((mdc < 0)) {
1178 dev_warn(&device->cdev->dev,
1179 "Detecting the maximum data size for zHPF "
1180 "requests failed (rc=%d) for a new path %x\n",
1181 mdc, lpm);
1182 return mdc;
1183 }
1184 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1185 if (fcx_max_data < private->fcx_max_data) {
1186 dev_warn(&device->cdev->dev,
1187 "The maximum data size for zHPF requests %u "
1188 "on a new path %x is below the active maximum "
1189 "%u\n", fcx_max_data, lpm,
1190 private->fcx_max_data);
1191 return -EACCES;
1192 }
1193 }
1194 return 0;
1195 }
1196
1197 static int rebuild_device_uid(struct dasd_device *device,
1198 struct path_verification_work_data *data)
1199 {
1200 struct dasd_eckd_private *private;
1201 struct dasd_path *path_data;
1202 __u8 lpm, opm;
1203 int rc;
1204
1205 rc = -ENODEV;
1206 private = (struct dasd_eckd_private *) device->private;
1207 path_data = &device->path_data;
1208 opm = device->path_data.opm;
1209
1210 for (lpm = 0x80; lpm; lpm >>= 1) {
1211 if (!(lpm & opm))
1212 continue;
1213 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1214 memset(&data->cqr, 0, sizeof(data->cqr));
1215 data->cqr.cpaddr = &data->ccw;
1216 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1217 data->rcd_buffer,
1218 lpm);
1219
1220 if (rc) {
1221 if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1222 continue;
1223 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1224 "Read configuration data "
1225 "returned error %d", rc);
1226 break;
1227 }
1228 memcpy(private->conf_data, data->rcd_buffer,
1229 DASD_ECKD_RCD_DATA_SIZE);
1230 if (dasd_eckd_identify_conf_parts(private)) {
1231 rc = -ENODEV;
1232 } else /* first valid path is enough */
1233 break;
1234 }
1235
1236 if (!rc)
1237 rc = dasd_eckd_generate_uid(device);
1238
1239 return rc;
1240 }
1241
1242 static void do_path_verification_work(struct work_struct *work)
1243 {
1244 struct path_verification_work_data *data;
1245 struct dasd_device *device;
1246 struct dasd_eckd_private path_private;
1247 struct dasd_uid *uid;
1248 __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1249 __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1250 unsigned long flags;
1251 char print_uid[60];
1252 int rc;
1253
1254 data = container_of(work, struct path_verification_work_data, worker);
1255 device = data->device;
1256
1257 /* delay path verification until device was resumed */
1258 if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1259 schedule_work(work);
1260 return;
1261 }
1262
1263 opm = 0;
1264 npm = 0;
1265 ppm = 0;
1266 epm = 0;
1267 hpfpm = 0;
1268 cablepm = 0;
1269
1270 for (lpm = 0x80; lpm; lpm >>= 1) {
1271 if (!(lpm & data->tbvpm))
1272 continue;
1273 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1274 memset(&data->cqr, 0, sizeof(data->cqr));
1275 data->cqr.cpaddr = &data->ccw;
1276 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1277 data->rcd_buffer,
1278 lpm);
1279 if (!rc) {
1280 switch (dasd_eckd_path_access(data->rcd_buffer,
1281 DASD_ECKD_RCD_DATA_SIZE)
1282 ) {
1283 case 0x02:
1284 npm |= lpm;
1285 break;
1286 case 0x03:
1287 ppm |= lpm;
1288 break;
1289 }
1290 opm |= lpm;
1291 } else if (rc == -EOPNOTSUPP) {
1292 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1293 "path verification: No configuration "
1294 "data retrieved");
1295 opm |= lpm;
1296 } else if (rc == -EAGAIN) {
1297 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1298 "path verification: device is stopped,"
1299 " try again later");
1300 epm |= lpm;
1301 } else {
1302 dev_warn(&device->cdev->dev,
1303 "Reading device feature codes failed "
1304 "(rc=%d) for new path %x\n", rc, lpm);
1305 continue;
1306 }
1307 if (verify_fcx_max_data(device, lpm)) {
1308 opm &= ~lpm;
1309 npm &= ~lpm;
1310 ppm &= ~lpm;
1311 hpfpm |= lpm;
1312 continue;
1313 }
1314
1315 /*
1316 * save conf_data for comparison after
1317 * rebuild_device_uid may have changed
1318 * the original data
1319 */
1320 memcpy(&path_rcd_buf, data->rcd_buffer,
1321 DASD_ECKD_RCD_DATA_SIZE);
1322 path_private.conf_data = (void *) &path_rcd_buf;
1323 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1324 if (dasd_eckd_identify_conf_parts(&path_private)) {
1325 path_private.conf_data = NULL;
1326 path_private.conf_len = 0;
1327 continue;
1328 }
1329
1330 /*
1331 * compare path UID with device UID only if at least
1332 * one valid path is left
1333 * in other case the device UID may have changed and
1334 * the first working path UID will be used as device UID
1335 */
1336 if (device->path_data.opm &&
1337 dasd_eckd_compare_path_uid(device, &path_private)) {
1338 /*
1339 * the comparison was not successful
1340 * rebuild the device UID with at least one
1341 * known path in case a z/VM hyperswap command
1342 * has changed the device
1343 *
1344 * after this compare again
1345 *
1346 * if either the rebuild or the recompare fails
1347 * the path can not be used
1348 */
1349 if (rebuild_device_uid(device, data) ||
1350 dasd_eckd_compare_path_uid(
1351 device, &path_private)) {
1352 uid = &path_private.uid;
1353 if (strlen(uid->vduit) > 0)
1354 snprintf(print_uid, sizeof(print_uid),
1355 "%s.%s.%04x.%02x.%s",
1356 uid->vendor, uid->serial,
1357 uid->ssid, uid->real_unit_addr,
1358 uid->vduit);
1359 else
1360 snprintf(print_uid, sizeof(print_uid),
1361 "%s.%s.%04x.%02x",
1362 uid->vendor, uid->serial,
1363 uid->ssid,
1364 uid->real_unit_addr);
1365 dev_err(&device->cdev->dev,
1366 "The newly added channel path %02X "
1367 "will not be used because it leads "
1368 "to a different device %s\n",
1369 lpm, print_uid);
1370 opm &= ~lpm;
1371 npm &= ~lpm;
1372 ppm &= ~lpm;
1373 cablepm |= lpm;
1374 continue;
1375 }
1376 }
1377
1378 /*
1379 * There is a small chance that a path is lost again between
1380 * above path verification and the following modification of
1381 * the device opm mask. We could avoid that race here by using
1382 * yet another path mask, but we rather deal with this unlikely
1383 * situation in dasd_start_IO.
1384 */
1385 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1386 if (!device->path_data.opm && opm) {
1387 device->path_data.opm = opm;
1388 device->path_data.cablepm &= ~opm;
1389 device->path_data.cuirpm &= ~opm;
1390 device->path_data.hpfpm &= ~opm;
1391 dasd_generic_path_operational(device);
1392 } else {
1393 device->path_data.opm |= opm;
1394 device->path_data.cablepm &= ~opm;
1395 device->path_data.cuirpm &= ~opm;
1396 device->path_data.hpfpm &= ~opm;
1397 }
1398 device->path_data.npm |= npm;
1399 device->path_data.ppm |= ppm;
1400 device->path_data.tbvpm |= epm;
1401 device->path_data.cablepm |= cablepm;
1402 device->path_data.hpfpm |= hpfpm;
1403 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1404 }
1405
1406 dasd_put_device(device);
1407 if (data->isglobal)
1408 mutex_unlock(&dasd_path_verification_mutex);
1409 else
1410 kfree(data);
1411 }
1412
1413 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1414 {
1415 struct path_verification_work_data *data;
1416
1417 data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1418 if (!data) {
1419 if (mutex_trylock(&dasd_path_verification_mutex)) {
1420 data = path_verification_worker;
1421 data->isglobal = 1;
1422 } else
1423 return -ENOMEM;
1424 } else {
1425 memset(data, 0, sizeof(*data));
1426 data->isglobal = 0;
1427 }
1428 INIT_WORK(&data->worker, do_path_verification_work);
1429 dasd_get_device(device);
1430 data->device = device;
1431 data->tbvpm = lpm;
1432 schedule_work(&data->worker);
1433 return 0;
1434 }
1435
1436 static int dasd_eckd_read_features(struct dasd_device *device)
1437 {
1438 struct dasd_psf_prssd_data *prssdp;
1439 struct dasd_rssd_features *features;
1440 struct dasd_ccw_req *cqr;
1441 struct ccw1 *ccw;
1442 int rc;
1443 struct dasd_eckd_private *private;
1444
1445 private = (struct dasd_eckd_private *) device->private;
1446 memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1447 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1448 (sizeof(struct dasd_psf_prssd_data) +
1449 sizeof(struct dasd_rssd_features)),
1450 device);
1451 if (IS_ERR(cqr)) {
1452 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1453 "allocate initialization request");
1454 return PTR_ERR(cqr);
1455 }
1456 cqr->startdev = device;
1457 cqr->memdev = device;
1458 cqr->block = NULL;
1459 cqr->retries = 256;
1460 cqr->expires = 10 * HZ;
1461
1462 /* Prepare for Read Subsystem Data */
1463 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1464 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1465 prssdp->order = PSF_ORDER_PRSSD;
1466 prssdp->suborder = 0x41; /* Read Feature Codes */
1467 /* all other bytes of prssdp must be zero */
1468
1469 ccw = cqr->cpaddr;
1470 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1471 ccw->count = sizeof(struct dasd_psf_prssd_data);
1472 ccw->flags |= CCW_FLAG_CC;
1473 ccw->cda = (__u32)(addr_t) prssdp;
1474
1475 /* Read Subsystem Data - feature codes */
1476 features = (struct dasd_rssd_features *) (prssdp + 1);
1477 memset(features, 0, sizeof(struct dasd_rssd_features));
1478
1479 ccw++;
1480 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1481 ccw->count = sizeof(struct dasd_rssd_features);
1482 ccw->cda = (__u32)(addr_t) features;
1483
1484 cqr->buildclk = get_tod_clock();
1485 cqr->status = DASD_CQR_FILLED;
1486 rc = dasd_sleep_on(cqr);
1487 if (rc == 0) {
1488 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1489 features = (struct dasd_rssd_features *) (prssdp + 1);
1490 memcpy(&private->features, features,
1491 sizeof(struct dasd_rssd_features));
1492 } else
1493 dev_warn(&device->cdev->dev, "Reading device feature codes"
1494 " failed with rc=%d\n", rc);
1495 dasd_sfree_request(cqr, cqr->memdev);
1496 return rc;
1497 }
1498
1499
1500 /*
1501 * Build CP for Perform Subsystem Function - SSC.
1502 */
1503 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1504 int enable_pav)
1505 {
1506 struct dasd_ccw_req *cqr;
1507 struct dasd_psf_ssc_data *psf_ssc_data;
1508 struct ccw1 *ccw;
1509
1510 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1511 sizeof(struct dasd_psf_ssc_data),
1512 device);
1513
1514 if (IS_ERR(cqr)) {
1515 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1516 "Could not allocate PSF-SSC request");
1517 return cqr;
1518 }
1519 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1520 psf_ssc_data->order = PSF_ORDER_SSC;
1521 psf_ssc_data->suborder = 0xc0;
1522 if (enable_pav) {
1523 psf_ssc_data->suborder |= 0x08;
1524 psf_ssc_data->reserved[0] = 0x88;
1525 }
1526 ccw = cqr->cpaddr;
1527 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1528 ccw->cda = (__u32)(addr_t)psf_ssc_data;
1529 ccw->count = 66;
1530
1531 cqr->startdev = device;
1532 cqr->memdev = device;
1533 cqr->block = NULL;
1534 cqr->retries = 256;
1535 cqr->expires = 10*HZ;
1536 cqr->buildclk = get_tod_clock();
1537 cqr->status = DASD_CQR_FILLED;
1538 return cqr;
1539 }
1540
1541 /*
1542 * Perform Subsystem Function.
1543 * It is necessary to trigger CIO for channel revalidation since this
1544 * call might change behaviour of DASD devices.
1545 */
1546 static int
1547 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1548 unsigned long flags)
1549 {
1550 struct dasd_ccw_req *cqr;
1551 int rc;
1552
1553 cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1554 if (IS_ERR(cqr))
1555 return PTR_ERR(cqr);
1556
1557 /*
1558 * set flags e.g. turn on failfast, to prevent blocking
1559 * the calling function should handle failed requests
1560 */
1561 cqr->flags |= flags;
1562
1563 rc = dasd_sleep_on(cqr);
1564 if (!rc)
1565 /* trigger CIO to reprobe devices */
1566 css_schedule_reprobe();
1567 else if (cqr->intrc == -EAGAIN)
1568 rc = -EAGAIN;
1569
1570 dasd_sfree_request(cqr, cqr->memdev);
1571 return rc;
1572 }
1573
1574 /*
1575 * Valide storage server of current device.
1576 */
1577 static int dasd_eckd_validate_server(struct dasd_device *device,
1578 unsigned long flags)
1579 {
1580 int rc;
1581 struct dasd_eckd_private *private;
1582 int enable_pav;
1583
1584 private = (struct dasd_eckd_private *) device->private;
1585 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1586 private->uid.type == UA_HYPER_PAV_ALIAS)
1587 return 0;
1588 if (dasd_nopav || MACHINE_IS_VM)
1589 enable_pav = 0;
1590 else
1591 enable_pav = 1;
1592 rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1593
1594 /* may be requested feature is not available on server,
1595 * therefore just report error and go ahead */
1596 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1597 "returned rc=%d", private->uid.ssid, rc);
1598 return rc;
1599 }
1600
1601 /*
1602 * worker to do a validate server in case of a lost pathgroup
1603 */
1604 static void dasd_eckd_do_validate_server(struct work_struct *work)
1605 {
1606 struct dasd_device *device = container_of(work, struct dasd_device,
1607 kick_validate);
1608 unsigned long flags = 0;
1609
1610 set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1611 if (dasd_eckd_validate_server(device, flags)
1612 == -EAGAIN) {
1613 /* schedule worker again if failed */
1614 schedule_work(&device->kick_validate);
1615 return;
1616 }
1617
1618 dasd_put_device(device);
1619 }
1620
1621 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1622 {
1623 dasd_get_device(device);
1624 /* exit if device not online or in offline processing */
1625 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1626 device->state < DASD_STATE_ONLINE) {
1627 dasd_put_device(device);
1628 return;
1629 }
1630 /* queue call to do_validate_server to the kernel event daemon. */
1631 schedule_work(&device->kick_validate);
1632 }
1633
1634 static u32 get_fcx_max_data(struct dasd_device *device)
1635 {
1636 #if defined(CONFIG_64BIT)
1637 int tpm, mdc;
1638 int fcx_in_css, fcx_in_gneq, fcx_in_features;
1639 struct dasd_eckd_private *private;
1640
1641 if (dasd_nofcx)
1642 return 0;
1643 /* is transport mode supported? */
1644 private = (struct dasd_eckd_private *) device->private;
1645 fcx_in_css = css_general_characteristics.fcx;
1646 fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1647 fcx_in_features = private->features.feature[40] & 0x80;
1648 tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1649
1650 if (!tpm)
1651 return 0;
1652
1653 mdc = ccw_device_get_mdc(device->cdev, 0);
1654 if (mdc < 0) {
1655 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1656 " data size for zHPF requests failed\n");
1657 return 0;
1658 } else
1659 return mdc * FCX_MAX_DATA_FACTOR;
1660 #else
1661 return 0;
1662 #endif
1663 }
1664
1665 /*
1666 * Check device characteristics.
1667 * If the device is accessible using ECKD discipline, the device is enabled.
1668 */
1669 static int
1670 dasd_eckd_check_characteristics(struct dasd_device *device)
1671 {
1672 struct dasd_eckd_private *private;
1673 struct dasd_block *block;
1674 struct dasd_uid temp_uid;
1675 int rc, i;
1676 int readonly;
1677 unsigned long value;
1678
1679 /* setup work queue for validate server*/
1680 INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1681
1682 if (!ccw_device_is_pathgroup(device->cdev)) {
1683 dev_warn(&device->cdev->dev,
1684 "A channel path group could not be established\n");
1685 return -EIO;
1686 }
1687 if (!ccw_device_is_multipath(device->cdev)) {
1688 dev_info(&device->cdev->dev,
1689 "The DASD is not operating in multipath mode\n");
1690 }
1691 private = (struct dasd_eckd_private *) device->private;
1692 if (!private) {
1693 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1694 if (!private) {
1695 dev_warn(&device->cdev->dev,
1696 "Allocating memory for private DASD data "
1697 "failed\n");
1698 return -ENOMEM;
1699 }
1700 device->private = (void *) private;
1701 } else {
1702 memset(private, 0, sizeof(*private));
1703 }
1704 /* Invalidate status of initial analysis. */
1705 private->init_cqr_status = -1;
1706 /* Set default cache operations. */
1707 private->attrib.operation = DASD_NORMAL_CACHE;
1708 private->attrib.nr_cyl = 0;
1709
1710 /* Read Configuration Data */
1711 rc = dasd_eckd_read_conf(device);
1712 if (rc)
1713 goto out_err1;
1714
1715 /* set default timeout */
1716 device->default_expires = DASD_EXPIRES;
1717 /* set default retry count */
1718 device->default_retries = DASD_RETRIES;
1719
1720 if (private->gneq) {
1721 value = 1;
1722 for (i = 0; i < private->gneq->timeout.value; i++)
1723 value = 10 * value;
1724 value = value * private->gneq->timeout.number;
1725 /* do not accept useless values */
1726 if (value != 0 && value <= DASD_EXPIRES_MAX)
1727 device->default_expires = value;
1728 }
1729
1730 dasd_eckd_get_uid(device, &temp_uid);
1731 if (temp_uid.type == UA_BASE_DEVICE) {
1732 block = dasd_alloc_block();
1733 if (IS_ERR(block)) {
1734 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1735 "could not allocate dasd "
1736 "block structure");
1737 rc = PTR_ERR(block);
1738 goto out_err1;
1739 }
1740 device->block = block;
1741 block->base = device;
1742 }
1743
1744 /* register lcu with alias handling, enable PAV */
1745 rc = dasd_alias_make_device_known_to_lcu(device);
1746 if (rc)
1747 goto out_err2;
1748
1749 dasd_eckd_validate_server(device, 0);
1750
1751 /* device may report different configuration data after LCU setup */
1752 rc = dasd_eckd_read_conf(device);
1753 if (rc)
1754 goto out_err3;
1755
1756 /* Read Feature Codes */
1757 dasd_eckd_read_features(device);
1758
1759 /* Read Device Characteristics */
1760 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1761 &private->rdc_data, 64);
1762 if (rc) {
1763 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1764 "Read device characteristic failed, rc=%d", rc);
1765 goto out_err3;
1766 }
1767
1768 if ((device->features & DASD_FEATURE_USERAW) &&
1769 !(private->rdc_data.facilities.RT_in_LR)) {
1770 dev_err(&device->cdev->dev, "The storage server does not "
1771 "support raw-track access\n");
1772 rc = -EINVAL;
1773 goto out_err3;
1774 }
1775
1776 /* find the valid cylinder size */
1777 if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1778 private->rdc_data.long_no_cyl)
1779 private->real_cyl = private->rdc_data.long_no_cyl;
1780 else
1781 private->real_cyl = private->rdc_data.no_cyl;
1782
1783 private->fcx_max_data = get_fcx_max_data(device);
1784
1785 readonly = dasd_device_is_ro(device);
1786 if (readonly)
1787 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1788
1789 dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1790 "with %d cylinders, %d heads, %d sectors%s\n",
1791 private->rdc_data.dev_type,
1792 private->rdc_data.dev_model,
1793 private->rdc_data.cu_type,
1794 private->rdc_data.cu_model.model,
1795 private->real_cyl,
1796 private->rdc_data.trk_per_cyl,
1797 private->rdc_data.sec_per_trk,
1798 readonly ? ", read-only device" : "");
1799 return 0;
1800
1801 out_err3:
1802 dasd_alias_disconnect_device_from_lcu(device);
1803 out_err2:
1804 dasd_free_block(device->block);
1805 device->block = NULL;
1806 out_err1:
1807 kfree(private->conf_data);
1808 kfree(device->private);
1809 device->private = NULL;
1810 return rc;
1811 }
1812
1813 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1814 {
1815 struct dasd_eckd_private *private;
1816
1817 private = (struct dasd_eckd_private *) device->private;
1818 dasd_alias_disconnect_device_from_lcu(device);
1819 private->ned = NULL;
1820 private->sneq = NULL;
1821 private->vdsneq = NULL;
1822 private->gneq = NULL;
1823 private->conf_len = 0;
1824 kfree(private->conf_data);
1825 private->conf_data = NULL;
1826 }
1827
1828 static struct dasd_ccw_req *
1829 dasd_eckd_analysis_ccw(struct dasd_device *device)
1830 {
1831 struct dasd_eckd_private *private;
1832 struct eckd_count *count_data;
1833 struct LO_eckd_data *LO_data;
1834 struct dasd_ccw_req *cqr;
1835 struct ccw1 *ccw;
1836 int cplength, datasize;
1837 int i;
1838
1839 private = (struct dasd_eckd_private *) device->private;
1840
1841 cplength = 8;
1842 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1843 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1844 if (IS_ERR(cqr))
1845 return cqr;
1846 ccw = cqr->cpaddr;
1847 /* Define extent for the first 3 tracks. */
1848 define_extent(ccw++, cqr->data, 0, 2,
1849 DASD_ECKD_CCW_READ_COUNT, device);
1850 LO_data = cqr->data + sizeof(struct DE_eckd_data);
1851 /* Locate record for the first 4 records on track 0. */
1852 ccw[-1].flags |= CCW_FLAG_CC;
1853 locate_record(ccw++, LO_data++, 0, 0, 4,
1854 DASD_ECKD_CCW_READ_COUNT, device, 0);
1855
1856 count_data = private->count_area;
1857 for (i = 0; i < 4; i++) {
1858 ccw[-1].flags |= CCW_FLAG_CC;
1859 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1860 ccw->flags = 0;
1861 ccw->count = 8;
1862 ccw->cda = (__u32)(addr_t) count_data;
1863 ccw++;
1864 count_data++;
1865 }
1866
1867 /* Locate record for the first record on track 2. */
1868 ccw[-1].flags |= CCW_FLAG_CC;
1869 locate_record(ccw++, LO_data++, 2, 0, 1,
1870 DASD_ECKD_CCW_READ_COUNT, device, 0);
1871 /* Read count ccw. */
1872 ccw[-1].flags |= CCW_FLAG_CC;
1873 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1874 ccw->flags = 0;
1875 ccw->count = 8;
1876 ccw->cda = (__u32)(addr_t) count_data;
1877
1878 cqr->block = NULL;
1879 cqr->startdev = device;
1880 cqr->memdev = device;
1881 cqr->retries = 255;
1882 cqr->buildclk = get_tod_clock();
1883 cqr->status = DASD_CQR_FILLED;
1884 return cqr;
1885 }
1886
1887 /* differentiate between 'no record found' and any other error */
1888 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1889 {
1890 char *sense;
1891 if (init_cqr->status == DASD_CQR_DONE)
1892 return INIT_CQR_OK;
1893 else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1894 init_cqr->status == DASD_CQR_FAILED) {
1895 sense = dasd_get_sense(&init_cqr->irb);
1896 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1897 return INIT_CQR_UNFORMATTED;
1898 else
1899 return INIT_CQR_ERROR;
1900 } else
1901 return INIT_CQR_ERROR;
1902 }
1903
1904 /*
1905 * This is the callback function for the init_analysis cqr. It saves
1906 * the status of the initial analysis ccw before it frees it and kicks
1907 * the device to continue the startup sequence. This will call
1908 * dasd_eckd_do_analysis again (if the devices has not been marked
1909 * for deletion in the meantime).
1910 */
1911 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1912 void *data)
1913 {
1914 struct dasd_eckd_private *private;
1915 struct dasd_device *device;
1916
1917 device = init_cqr->startdev;
1918 private = (struct dasd_eckd_private *) device->private;
1919 private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1920 dasd_sfree_request(init_cqr, device);
1921 dasd_kick_device(device);
1922 }
1923
1924 static int dasd_eckd_start_analysis(struct dasd_block *block)
1925 {
1926 struct dasd_ccw_req *init_cqr;
1927
1928 init_cqr = dasd_eckd_analysis_ccw(block->base);
1929 if (IS_ERR(init_cqr))
1930 return PTR_ERR(init_cqr);
1931 init_cqr->callback = dasd_eckd_analysis_callback;
1932 init_cqr->callback_data = NULL;
1933 init_cqr->expires = 5*HZ;
1934 /* first try without ERP, so we can later handle unformatted
1935 * devices as special case
1936 */
1937 clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1938 init_cqr->retries = 0;
1939 dasd_add_request_head(init_cqr);
1940 return -EAGAIN;
1941 }
1942
1943 static int dasd_eckd_end_analysis(struct dasd_block *block)
1944 {
1945 struct dasd_device *device;
1946 struct dasd_eckd_private *private;
1947 struct eckd_count *count_area;
1948 unsigned int sb, blk_per_trk;
1949 int status, i;
1950 struct dasd_ccw_req *init_cqr;
1951
1952 device = block->base;
1953 private = (struct dasd_eckd_private *) device->private;
1954 status = private->init_cqr_status;
1955 private->init_cqr_status = -1;
1956 if (status == INIT_CQR_ERROR) {
1957 /* try again, this time with full ERP */
1958 init_cqr = dasd_eckd_analysis_ccw(device);
1959 dasd_sleep_on(init_cqr);
1960 status = dasd_eckd_analysis_evaluation(init_cqr);
1961 dasd_sfree_request(init_cqr, device);
1962 }
1963
1964 if (device->features & DASD_FEATURE_USERAW) {
1965 block->bp_block = DASD_RAW_BLOCKSIZE;
1966 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1967 block->s2b_shift = 3;
1968 goto raw;
1969 }
1970
1971 if (status == INIT_CQR_UNFORMATTED) {
1972 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1973 return -EMEDIUMTYPE;
1974 } else if (status == INIT_CQR_ERROR) {
1975 dev_err(&device->cdev->dev,
1976 "Detecting the DASD disk layout failed because "
1977 "of an I/O error\n");
1978 return -EIO;
1979 }
1980
1981 private->uses_cdl = 1;
1982 /* Check Track 0 for Compatible Disk Layout */
1983 count_area = NULL;
1984 for (i = 0; i < 3; i++) {
1985 if (private->count_area[i].kl != 4 ||
1986 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1987 private->count_area[i].cyl != 0 ||
1988 private->count_area[i].head != count_area_head[i] ||
1989 private->count_area[i].record != count_area_rec[i]) {
1990 private->uses_cdl = 0;
1991 break;
1992 }
1993 }
1994 if (i == 3)
1995 count_area = &private->count_area[4];
1996
1997 if (private->uses_cdl == 0) {
1998 for (i = 0; i < 5; i++) {
1999 if ((private->count_area[i].kl != 0) ||
2000 (private->count_area[i].dl !=
2001 private->count_area[0].dl) ||
2002 private->count_area[i].cyl != 0 ||
2003 private->count_area[i].head != count_area_head[i] ||
2004 private->count_area[i].record != count_area_rec[i])
2005 break;
2006 }
2007 if (i == 5)
2008 count_area = &private->count_area[0];
2009 } else {
2010 if (private->count_area[3].record == 1)
2011 dev_warn(&device->cdev->dev,
2012 "Track 0 has no records following the VTOC\n");
2013 }
2014
2015 if (count_area != NULL && count_area->kl == 0) {
2016 /* we found notthing violating our disk layout */
2017 if (dasd_check_blocksize(count_area->dl) == 0)
2018 block->bp_block = count_area->dl;
2019 }
2020 if (block->bp_block == 0) {
2021 dev_warn(&device->cdev->dev,
2022 "The disk layout of the DASD is not supported\n");
2023 return -EMEDIUMTYPE;
2024 }
2025 block->s2b_shift = 0; /* bits to shift 512 to get a block */
2026 for (sb = 512; sb < block->bp_block; sb = sb << 1)
2027 block->s2b_shift++;
2028
2029 blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2030
2031 raw:
2032 block->blocks = (private->real_cyl *
2033 private->rdc_data.trk_per_cyl *
2034 blk_per_trk);
2035
2036 dev_info(&device->cdev->dev,
2037 "DASD with %d KB/block, %d KB total size, %d KB/track, "
2038 "%s\n", (block->bp_block >> 10),
2039 ((private->real_cyl *
2040 private->rdc_data.trk_per_cyl *
2041 blk_per_trk * (block->bp_block >> 9)) >> 1),
2042 ((blk_per_trk * block->bp_block) >> 10),
2043 private->uses_cdl ?
2044 "compatible disk layout" : "linux disk layout");
2045
2046 return 0;
2047 }
2048
2049 static int dasd_eckd_do_analysis(struct dasd_block *block)
2050 {
2051 struct dasd_eckd_private *private;
2052
2053 private = (struct dasd_eckd_private *) block->base->private;
2054 if (private->init_cqr_status < 0)
2055 return dasd_eckd_start_analysis(block);
2056 else
2057 return dasd_eckd_end_analysis(block);
2058 }
2059
2060 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2061 {
2062 return dasd_alias_add_device(device);
2063 };
2064
2065 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2066 {
2067 cancel_work_sync(&device->reload_device);
2068 cancel_work_sync(&device->kick_validate);
2069 return 0;
2070 };
2071
2072 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2073 {
2074 return dasd_alias_remove_device(device);
2075 };
2076
2077 static int
2078 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2079 {
2080 struct dasd_eckd_private *private;
2081
2082 private = (struct dasd_eckd_private *) block->base->private;
2083 if (dasd_check_blocksize(block->bp_block) == 0) {
2084 geo->sectors = recs_per_track(&private->rdc_data,
2085 0, block->bp_block);
2086 }
2087 geo->cylinders = private->rdc_data.no_cyl;
2088 geo->heads = private->rdc_data.trk_per_cyl;
2089 return 0;
2090 }
2091
2092 static struct dasd_ccw_req *
2093 dasd_eckd_build_format(struct dasd_device *base,
2094 struct format_data_t *fdata,
2095 int enable_pav)
2096 {
2097 struct dasd_eckd_private *base_priv;
2098 struct dasd_eckd_private *start_priv;
2099 struct dasd_device *startdev = NULL;
2100 struct dasd_ccw_req *fcp;
2101 struct eckd_count *ect;
2102 struct ch_t address;
2103 struct ccw1 *ccw;
2104 void *data;
2105 int rpt;
2106 int cplength, datasize;
2107 int i, j;
2108 int intensity = 0;
2109 int r0_perm;
2110 int nr_tracks;
2111 int use_prefix;
2112
2113 if (enable_pav)
2114 startdev = dasd_alias_get_start_dev(base);
2115
2116 if (!startdev)
2117 startdev = base;
2118
2119 start_priv = (struct dasd_eckd_private *) startdev->private;
2120 base_priv = (struct dasd_eckd_private *) base->private;
2121
2122 rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2123
2124 nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2125
2126 /*
2127 * fdata->intensity is a bit string that tells us what to do:
2128 * Bit 0: write record zero
2129 * Bit 1: write home address, currently not supported
2130 * Bit 2: invalidate tracks
2131 * Bit 3: use OS/390 compatible disk layout (cdl)
2132 * Bit 4: do not allow storage subsystem to modify record zero
2133 * Only some bit combinations do make sense.
2134 */
2135 if (fdata->intensity & 0x10) {
2136 r0_perm = 0;
2137 intensity = fdata->intensity & ~0x10;
2138 } else {
2139 r0_perm = 1;
2140 intensity = fdata->intensity;
2141 }
2142
2143 use_prefix = base_priv->features.feature[8] & 0x01;
2144
2145 switch (intensity) {
2146 case 0x00: /* Normal format */
2147 case 0x08: /* Normal format, use cdl. */
2148 cplength = 2 + (rpt*nr_tracks);
2149 if (use_prefix)
2150 datasize = sizeof(struct PFX_eckd_data) +
2151 sizeof(struct LO_eckd_data) +
2152 rpt * nr_tracks * sizeof(struct eckd_count);
2153 else
2154 datasize = sizeof(struct DE_eckd_data) +
2155 sizeof(struct LO_eckd_data) +
2156 rpt * nr_tracks * sizeof(struct eckd_count);
2157 break;
2158 case 0x01: /* Write record zero and format track. */
2159 case 0x09: /* Write record zero and format track, use cdl. */
2160 cplength = 2 + rpt * nr_tracks;
2161 if (use_prefix)
2162 datasize = sizeof(struct PFX_eckd_data) +
2163 sizeof(struct LO_eckd_data) +
2164 sizeof(struct eckd_count) +
2165 rpt * nr_tracks * sizeof(struct eckd_count);
2166 else
2167 datasize = sizeof(struct DE_eckd_data) +
2168 sizeof(struct LO_eckd_data) +
2169 sizeof(struct eckd_count) +
2170 rpt * nr_tracks * sizeof(struct eckd_count);
2171 break;
2172 case 0x04: /* Invalidate track. */
2173 case 0x0c: /* Invalidate track, use cdl. */
2174 cplength = 3;
2175 if (use_prefix)
2176 datasize = sizeof(struct PFX_eckd_data) +
2177 sizeof(struct LO_eckd_data) +
2178 sizeof(struct eckd_count);
2179 else
2180 datasize = sizeof(struct DE_eckd_data) +
2181 sizeof(struct LO_eckd_data) +
2182 sizeof(struct eckd_count);
2183 break;
2184 default:
2185 dev_warn(&startdev->cdev->dev,
2186 "An I/O control call used incorrect flags 0x%x\n",
2187 fdata->intensity);
2188 return ERR_PTR(-EINVAL);
2189 }
2190 /* Allocate the format ccw request. */
2191 fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2192 datasize, startdev);
2193 if (IS_ERR(fcp))
2194 return fcp;
2195
2196 start_priv->count++;
2197 data = fcp->data;
2198 ccw = fcp->cpaddr;
2199
2200 switch (intensity & ~0x08) {
2201 case 0x00: /* Normal format. */
2202 if (use_prefix) {
2203 prefix(ccw++, (struct PFX_eckd_data *) data,
2204 fdata->start_unit, fdata->stop_unit,
2205 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2206 /* grant subsystem permission to format R0 */
2207 if (r0_perm)
2208 ((struct PFX_eckd_data *)data)
2209 ->define_extent.ga_extended |= 0x04;
2210 data += sizeof(struct PFX_eckd_data);
2211 } else {
2212 define_extent(ccw++, (struct DE_eckd_data *) data,
2213 fdata->start_unit, fdata->stop_unit,
2214 DASD_ECKD_CCW_WRITE_CKD, startdev);
2215 /* grant subsystem permission to format R0 */
2216 if (r0_perm)
2217 ((struct DE_eckd_data *) data)
2218 ->ga_extended |= 0x04;
2219 data += sizeof(struct DE_eckd_data);
2220 }
2221 ccw[-1].flags |= CCW_FLAG_CC;
2222 locate_record(ccw++, (struct LO_eckd_data *) data,
2223 fdata->start_unit, 0, rpt*nr_tracks,
2224 DASD_ECKD_CCW_WRITE_CKD, base,
2225 fdata->blksize);
2226 data += sizeof(struct LO_eckd_data);
2227 break;
2228 case 0x01: /* Write record zero + format track. */
2229 if (use_prefix) {
2230 prefix(ccw++, (struct PFX_eckd_data *) data,
2231 fdata->start_unit, fdata->stop_unit,
2232 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2233 base, startdev);
2234 data += sizeof(struct PFX_eckd_data);
2235 } else {
2236 define_extent(ccw++, (struct DE_eckd_data *) data,
2237 fdata->start_unit, fdata->stop_unit,
2238 DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev);
2239 data += sizeof(struct DE_eckd_data);
2240 }
2241 ccw[-1].flags |= CCW_FLAG_CC;
2242 locate_record(ccw++, (struct LO_eckd_data *) data,
2243 fdata->start_unit, 0, rpt * nr_tracks + 1,
2244 DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2245 base->block->bp_block);
2246 data += sizeof(struct LO_eckd_data);
2247 break;
2248 case 0x04: /* Invalidate track. */
2249 if (use_prefix) {
2250 prefix(ccw++, (struct PFX_eckd_data *) data,
2251 fdata->start_unit, fdata->stop_unit,
2252 DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2253 data += sizeof(struct PFX_eckd_data);
2254 } else {
2255 define_extent(ccw++, (struct DE_eckd_data *) data,
2256 fdata->start_unit, fdata->stop_unit,
2257 DASD_ECKD_CCW_WRITE_CKD, startdev);
2258 data += sizeof(struct DE_eckd_data);
2259 }
2260 ccw[-1].flags |= CCW_FLAG_CC;
2261 locate_record(ccw++, (struct LO_eckd_data *) data,
2262 fdata->start_unit, 0, 1,
2263 DASD_ECKD_CCW_WRITE_CKD, base, 8);
2264 data += sizeof(struct LO_eckd_data);
2265 break;
2266 }
2267
2268 for (j = 0; j < nr_tracks; j++) {
2269 /* calculate cylinder and head for the current track */
2270 set_ch_t(&address,
2271 (fdata->start_unit + j) /
2272 base_priv->rdc_data.trk_per_cyl,
2273 (fdata->start_unit + j) %
2274 base_priv->rdc_data.trk_per_cyl);
2275 if (intensity & 0x01) { /* write record zero */
2276 ect = (struct eckd_count *) data;
2277 data += sizeof(struct eckd_count);
2278 ect->cyl = address.cyl;
2279 ect->head = address.head;
2280 ect->record = 0;
2281 ect->kl = 0;
2282 ect->dl = 8;
2283 ccw[-1].flags |= CCW_FLAG_CC;
2284 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2285 ccw->flags = CCW_FLAG_SLI;
2286 ccw->count = 8;
2287 ccw->cda = (__u32)(addr_t) ect;
2288 ccw++;
2289 }
2290 if ((intensity & ~0x08) & 0x04) { /* erase track */
2291 ect = (struct eckd_count *) data;
2292 data += sizeof(struct eckd_count);
2293 ect->cyl = address.cyl;
2294 ect->head = address.head;
2295 ect->record = 1;
2296 ect->kl = 0;
2297 ect->dl = 0;
2298 ccw[-1].flags |= CCW_FLAG_CC;
2299 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2300 ccw->flags = CCW_FLAG_SLI;
2301 ccw->count = 8;
2302 ccw->cda = (__u32)(addr_t) ect;
2303 } else { /* write remaining records */
2304 for (i = 0; i < rpt; i++) {
2305 ect = (struct eckd_count *) data;
2306 data += sizeof(struct eckd_count);
2307 ect->cyl = address.cyl;
2308 ect->head = address.head;
2309 ect->record = i + 1;
2310 ect->kl = 0;
2311 ect->dl = fdata->blksize;
2312 /*
2313 * Check for special tracks 0-1
2314 * when formatting CDL
2315 */
2316 if ((intensity & 0x08) &&
2317 fdata->start_unit == 0) {
2318 if (i < 3) {
2319 ect->kl = 4;
2320 ect->dl = sizes_trk0[i] - 4;
2321 }
2322 }
2323 if ((intensity & 0x08) &&
2324 fdata->start_unit == 1) {
2325 ect->kl = 44;
2326 ect->dl = LABEL_SIZE - 44;
2327 }
2328 ccw[-1].flags |= CCW_FLAG_CC;
2329 if (i != 0 || j == 0)
2330 ccw->cmd_code =
2331 DASD_ECKD_CCW_WRITE_CKD;
2332 else
2333 ccw->cmd_code =
2334 DASD_ECKD_CCW_WRITE_CKD_MT;
2335 ccw->flags = CCW_FLAG_SLI;
2336 ccw->count = 8;
2337 ccw->cda = (__u32)(addr_t) ect;
2338 ccw++;
2339 }
2340 }
2341 }
2342
2343 fcp->startdev = startdev;
2344 fcp->memdev = startdev;
2345 fcp->basedev = base;
2346 fcp->retries = 256;
2347 fcp->expires = startdev->default_expires * HZ;
2348 fcp->buildclk = get_tod_clock();
2349 fcp->status = DASD_CQR_FILLED;
2350
2351 return fcp;
2352 }
2353
2354 static int
2355 dasd_eckd_format_device(struct dasd_device *base,
2356 struct format_data_t *fdata,
2357 int enable_pav)
2358 {
2359 struct dasd_ccw_req *cqr, *n;
2360 struct dasd_block *block;
2361 struct dasd_eckd_private *private;
2362 struct list_head format_queue;
2363 struct dasd_device *device;
2364 int old_stop, format_step;
2365 int step, rc = 0, sleep_rc;
2366
2367 block = base->block;
2368 private = (struct dasd_eckd_private *) base->private;
2369
2370 /* Sanity checks. */
2371 if (fdata->start_unit >=
2372 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2373 dev_warn(&base->cdev->dev,
2374 "Start track number %u used in formatting is too big\n",
2375 fdata->start_unit);
2376 return -EINVAL;
2377 }
2378 if (fdata->stop_unit >=
2379 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2380 dev_warn(&base->cdev->dev,
2381 "Stop track number %u used in formatting is too big\n",
2382 fdata->stop_unit);
2383 return -EINVAL;
2384 }
2385 if (fdata->start_unit > fdata->stop_unit) {
2386 dev_warn(&base->cdev->dev,
2387 "Start track %u used in formatting exceeds end track\n",
2388 fdata->start_unit);
2389 return -EINVAL;
2390 }
2391 if (dasd_check_blocksize(fdata->blksize) != 0) {
2392 dev_warn(&base->cdev->dev,
2393 "The DASD cannot be formatted with block size %u\n",
2394 fdata->blksize);
2395 return -EINVAL;
2396 }
2397
2398 INIT_LIST_HEAD(&format_queue);
2399
2400 old_stop = fdata->stop_unit;
2401 while (fdata->start_unit <= 1) {
2402 fdata->stop_unit = fdata->start_unit;
2403 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2404 list_add(&cqr->blocklist, &format_queue);
2405
2406 fdata->stop_unit = old_stop;
2407 fdata->start_unit++;
2408
2409 if (fdata->start_unit > fdata->stop_unit)
2410 goto sleep;
2411 }
2412
2413 retry:
2414 format_step = 255 / recs_per_track(&private->rdc_data, 0,
2415 fdata->blksize);
2416 while (fdata->start_unit <= old_stop) {
2417 step = fdata->stop_unit - fdata->start_unit + 1;
2418 if (step > format_step)
2419 fdata->stop_unit = fdata->start_unit + format_step - 1;
2420
2421 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2422 if (IS_ERR(cqr)) {
2423 if (PTR_ERR(cqr) == -ENOMEM) {
2424 /*
2425 * not enough memory available
2426 * go to out and start requests
2427 * retry after first requests were finished
2428 */
2429 fdata->stop_unit = old_stop;
2430 goto sleep;
2431 } else
2432 return PTR_ERR(cqr);
2433 }
2434 list_add(&cqr->blocklist, &format_queue);
2435
2436 fdata->start_unit = fdata->stop_unit + 1;
2437 fdata->stop_unit = old_stop;
2438 }
2439
2440 sleep:
2441 sleep_rc = dasd_sleep_on_queue(&format_queue);
2442
2443 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2444 device = cqr->startdev;
2445 private = (struct dasd_eckd_private *) device->private;
2446 if (cqr->status == DASD_CQR_FAILED)
2447 rc = -EIO;
2448 list_del_init(&cqr->blocklist);
2449 dasd_sfree_request(cqr, device);
2450 private->count--;
2451 }
2452
2453 if (sleep_rc)
2454 return sleep_rc;
2455
2456 /*
2457 * in case of ENOMEM we need to retry after
2458 * first requests are finished
2459 */
2460 if (fdata->start_unit <= fdata->stop_unit)
2461 goto retry;
2462
2463 return rc;
2464 }
2465
2466 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2467 {
2468 if (cqr->retries < 0) {
2469 cqr->status = DASD_CQR_FAILED;
2470 return;
2471 }
2472 cqr->status = DASD_CQR_FILLED;
2473 if (cqr->block && (cqr->startdev != cqr->block->base)) {
2474 dasd_eckd_reset_ccw_to_base_io(cqr);
2475 cqr->startdev = cqr->block->base;
2476 cqr->lpm = cqr->block->base->path_data.opm;
2477 }
2478 };
2479
2480 static dasd_erp_fn_t
2481 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2482 {
2483 struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2484 struct ccw_device *cdev = device->cdev;
2485
2486 switch (cdev->id.cu_type) {
2487 case 0x3990:
2488 case 0x2105:
2489 case 0x2107:
2490 case 0x1750:
2491 return dasd_3990_erp_action;
2492 case 0x9343:
2493 case 0x3880:
2494 default:
2495 return dasd_default_erp_action;
2496 }
2497 }
2498
2499 static dasd_erp_fn_t
2500 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2501 {
2502 return dasd_default_erp_postaction;
2503 }
2504
2505 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2506 struct dasd_ccw_req *cqr,
2507 struct irb *irb)
2508 {
2509 char mask;
2510 char *sense = NULL;
2511 struct dasd_eckd_private *private;
2512
2513 private = (struct dasd_eckd_private *) device->private;
2514 /* first of all check for state change pending interrupt */
2515 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2516 if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2517 /*
2518 * for alias only, not in offline processing
2519 * and only if not suspended
2520 */
2521 if (!device->block && private->lcu &&
2522 device->state == DASD_STATE_ONLINE &&
2523 !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2524 !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2525 /*
2526 * the state change could be caused by an alias
2527 * reassignment remove device from alias handling
2528 * to prevent new requests from being scheduled on
2529 * the wrong alias device
2530 */
2531 dasd_alias_remove_device(device);
2532
2533 /* schedule worker to reload device */
2534 dasd_reload_device(device);
2535 }
2536 dasd_generic_handle_state_change(device);
2537 return;
2538 }
2539
2540 sense = dasd_get_sense(irb);
2541 if (!sense)
2542 return;
2543
2544 /* summary unit check */
2545 if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2546 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2547 dasd_alias_handle_summary_unit_check(device, irb);
2548 return;
2549 }
2550
2551 /* service information message SIM */
2552 if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2553 ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2554 dasd_3990_erp_handle_sim(device, sense);
2555 return;
2556 }
2557
2558 /* loss of device reservation is handled via base devices only
2559 * as alias devices may be used with several bases
2560 */
2561 if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2562 (sense[7] == 0x3F) &&
2563 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2564 test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2565 if (device->features & DASD_FEATURE_FAILONSLCK)
2566 set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2567 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2568 dev_err(&device->cdev->dev,
2569 "The device reservation was lost\n");
2570 }
2571 }
2572
2573 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2574 struct dasd_device *startdev,
2575 struct dasd_block *block,
2576 struct request *req,
2577 sector_t first_rec,
2578 sector_t last_rec,
2579 sector_t first_trk,
2580 sector_t last_trk,
2581 unsigned int first_offs,
2582 unsigned int last_offs,
2583 unsigned int blk_per_trk,
2584 unsigned int blksize)
2585 {
2586 struct dasd_eckd_private *private;
2587 unsigned long *idaws;
2588 struct LO_eckd_data *LO_data;
2589 struct dasd_ccw_req *cqr;
2590 struct ccw1 *ccw;
2591 struct req_iterator iter;
2592 struct bio_vec bv;
2593 char *dst;
2594 unsigned int off;
2595 int count, cidaw, cplength, datasize;
2596 sector_t recid;
2597 unsigned char cmd, rcmd;
2598 int use_prefix;
2599 struct dasd_device *basedev;
2600
2601 basedev = block->base;
2602 private = (struct dasd_eckd_private *) basedev->private;
2603 if (rq_data_dir(req) == READ)
2604 cmd = DASD_ECKD_CCW_READ_MT;
2605 else if (rq_data_dir(req) == WRITE)
2606 cmd = DASD_ECKD_CCW_WRITE_MT;
2607 else
2608 return ERR_PTR(-EINVAL);
2609
2610 /* Check struct bio and count the number of blocks for the request. */
2611 count = 0;
2612 cidaw = 0;
2613 rq_for_each_segment(bv, req, iter) {
2614 if (bv.bv_len & (blksize - 1))
2615 /* Eckd can only do full blocks. */
2616 return ERR_PTR(-EINVAL);
2617 count += bv.bv_len >> (block->s2b_shift + 9);
2618 #if defined(CONFIG_64BIT)
2619 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
2620 cidaw += bv.bv_len >> (block->s2b_shift + 9);
2621 #endif
2622 }
2623 /* Paranoia. */
2624 if (count != last_rec - first_rec + 1)
2625 return ERR_PTR(-EINVAL);
2626
2627 /* use the prefix command if available */
2628 use_prefix = private->features.feature[8] & 0x01;
2629 if (use_prefix) {
2630 /* 1x prefix + number of blocks */
2631 cplength = 2 + count;
2632 /* 1x prefix + cidaws*sizeof(long) */
2633 datasize = sizeof(struct PFX_eckd_data) +
2634 sizeof(struct LO_eckd_data) +
2635 cidaw * sizeof(unsigned long);
2636 } else {
2637 /* 1x define extent + 1x locate record + number of blocks */
2638 cplength = 2 + count;
2639 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2640 datasize = sizeof(struct DE_eckd_data) +
2641 sizeof(struct LO_eckd_data) +
2642 cidaw * sizeof(unsigned long);
2643 }
2644 /* Find out the number of additional locate record ccws for cdl. */
2645 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2646 if (last_rec >= 2*blk_per_trk)
2647 count = 2*blk_per_trk - first_rec;
2648 cplength += count;
2649 datasize += count*sizeof(struct LO_eckd_data);
2650 }
2651 /* Allocate the ccw request. */
2652 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2653 startdev);
2654 if (IS_ERR(cqr))
2655 return cqr;
2656 ccw = cqr->cpaddr;
2657 /* First ccw is define extent or prefix. */
2658 if (use_prefix) {
2659 if (prefix(ccw++, cqr->data, first_trk,
2660 last_trk, cmd, basedev, startdev) == -EAGAIN) {
2661 /* Clock not in sync and XRC is enabled.
2662 * Try again later.
2663 */
2664 dasd_sfree_request(cqr, startdev);
2665 return ERR_PTR(-EAGAIN);
2666 }
2667 idaws = (unsigned long *) (cqr->data +
2668 sizeof(struct PFX_eckd_data));
2669 } else {
2670 if (define_extent(ccw++, cqr->data, first_trk,
2671 last_trk, cmd, basedev) == -EAGAIN) {
2672 /* Clock not in sync and XRC is enabled.
2673 * Try again later.
2674 */
2675 dasd_sfree_request(cqr, startdev);
2676 return ERR_PTR(-EAGAIN);
2677 }
2678 idaws = (unsigned long *) (cqr->data +
2679 sizeof(struct DE_eckd_data));
2680 }
2681 /* Build locate_record+read/write/ccws. */
2682 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2683 recid = first_rec;
2684 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2685 /* Only standard blocks so there is just one locate record. */
2686 ccw[-1].flags |= CCW_FLAG_CC;
2687 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2688 last_rec - recid + 1, cmd, basedev, blksize);
2689 }
2690 rq_for_each_segment(bv, req, iter) {
2691 dst = page_address(bv.bv_page) + bv.bv_offset;
2692 if (dasd_page_cache) {
2693 char *copy = kmem_cache_alloc(dasd_page_cache,
2694 GFP_DMA | __GFP_NOWARN);
2695 if (copy && rq_data_dir(req) == WRITE)
2696 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
2697 if (copy)
2698 dst = copy + bv.bv_offset;
2699 }
2700 for (off = 0; off < bv.bv_len; off += blksize) {
2701 sector_t trkid = recid;
2702 unsigned int recoffs = sector_div(trkid, blk_per_trk);
2703 rcmd = cmd;
2704 count = blksize;
2705 /* Locate record for cdl special block ? */
2706 if (private->uses_cdl && recid < 2*blk_per_trk) {
2707 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2708 rcmd |= 0x8;
2709 count = dasd_eckd_cdl_reclen(recid);
2710 if (count < blksize &&
2711 rq_data_dir(req) == READ)
2712 memset(dst + count, 0xe5,
2713 blksize - count);
2714 }
2715 ccw[-1].flags |= CCW_FLAG_CC;
2716 locate_record(ccw++, LO_data++,
2717 trkid, recoffs + 1,
2718 1, rcmd, basedev, count);
2719 }
2720 /* Locate record for standard blocks ? */
2721 if (private->uses_cdl && recid == 2*blk_per_trk) {
2722 ccw[-1].flags |= CCW_FLAG_CC;
2723 locate_record(ccw++, LO_data++,
2724 trkid, recoffs + 1,
2725 last_rec - recid + 1,
2726 cmd, basedev, count);
2727 }
2728 /* Read/write ccw. */
2729 ccw[-1].flags |= CCW_FLAG_CC;
2730 ccw->cmd_code = rcmd;
2731 ccw->count = count;
2732 if (idal_is_needed(dst, blksize)) {
2733 ccw->cda = (__u32)(addr_t) idaws;
2734 ccw->flags = CCW_FLAG_IDA;
2735 idaws = idal_create_words(idaws, dst, blksize);
2736 } else {
2737 ccw->cda = (__u32)(addr_t) dst;
2738 ccw->flags = 0;
2739 }
2740 ccw++;
2741 dst += blksize;
2742 recid++;
2743 }
2744 }
2745 if (blk_noretry_request(req) ||
2746 block->base->features & DASD_FEATURE_FAILFAST)
2747 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2748 cqr->startdev = startdev;
2749 cqr->memdev = startdev;
2750 cqr->block = block;
2751 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2752 cqr->lpm = startdev->path_data.ppm;
2753 cqr->retries = startdev->default_retries;
2754 cqr->buildclk = get_tod_clock();
2755 cqr->status = DASD_CQR_FILLED;
2756 return cqr;
2757 }
2758
2759 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2760 struct dasd_device *startdev,
2761 struct dasd_block *block,
2762 struct request *req,
2763 sector_t first_rec,
2764 sector_t last_rec,
2765 sector_t first_trk,
2766 sector_t last_trk,
2767 unsigned int first_offs,
2768 unsigned int last_offs,
2769 unsigned int blk_per_trk,
2770 unsigned int blksize)
2771 {
2772 unsigned long *idaws;
2773 struct dasd_ccw_req *cqr;
2774 struct ccw1 *ccw;
2775 struct req_iterator iter;
2776 struct bio_vec bv;
2777 char *dst, *idaw_dst;
2778 unsigned int cidaw, cplength, datasize;
2779 unsigned int tlf;
2780 sector_t recid;
2781 unsigned char cmd;
2782 struct dasd_device *basedev;
2783 unsigned int trkcount, count, count_to_trk_end;
2784 unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2785 unsigned char new_track, end_idaw;
2786 sector_t trkid;
2787 unsigned int recoffs;
2788
2789 basedev = block->base;
2790 if (rq_data_dir(req) == READ)
2791 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2792 else if (rq_data_dir(req) == WRITE)
2793 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2794 else
2795 return ERR_PTR(-EINVAL);
2796
2797 /* Track based I/O needs IDAWs for each page, and not just for
2798 * 64 bit addresses. We need additional idals for pages
2799 * that get filled from two tracks, so we use the number
2800 * of records as upper limit.
2801 */
2802 cidaw = last_rec - first_rec + 1;
2803 trkcount = last_trk - first_trk + 1;
2804
2805 /* 1x prefix + one read/write ccw per track */
2806 cplength = 1 + trkcount;
2807
2808 /* on 31-bit we need space for two 32 bit addresses per page
2809 * on 64-bit one 64 bit address
2810 */
2811 datasize = sizeof(struct PFX_eckd_data) +
2812 cidaw * sizeof(unsigned long long);
2813
2814 /* Allocate the ccw request. */
2815 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2816 startdev);
2817 if (IS_ERR(cqr))
2818 return cqr;
2819 ccw = cqr->cpaddr;
2820 /* transfer length factor: how many bytes to read from the last track */
2821 if (first_trk == last_trk)
2822 tlf = last_offs - first_offs + 1;
2823 else
2824 tlf = last_offs + 1;
2825 tlf *= blksize;
2826
2827 if (prefix_LRE(ccw++, cqr->data, first_trk,
2828 last_trk, cmd, basedev, startdev,
2829 1 /* format */, first_offs + 1,
2830 trkcount, blksize,
2831 tlf) == -EAGAIN) {
2832 /* Clock not in sync and XRC is enabled.
2833 * Try again later.
2834 */
2835 dasd_sfree_request(cqr, startdev);
2836 return ERR_PTR(-EAGAIN);
2837 }
2838
2839 /*
2840 * The translation of request into ccw programs must meet the
2841 * following conditions:
2842 * - all idaws but the first and the last must address full pages
2843 * (or 2K blocks on 31-bit)
2844 * - the scope of a ccw and it's idal ends with the track boundaries
2845 */
2846 idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2847 recid = first_rec;
2848 new_track = 1;
2849 end_idaw = 0;
2850 len_to_track_end = 0;
2851 idaw_dst = NULL;
2852 idaw_len = 0;
2853 rq_for_each_segment(bv, req, iter) {
2854 dst = page_address(bv.bv_page) + bv.bv_offset;
2855 seg_len = bv.bv_len;
2856 while (seg_len) {
2857 if (new_track) {
2858 trkid = recid;
2859 recoffs = sector_div(trkid, blk_per_trk);
2860 count_to_trk_end = blk_per_trk - recoffs;
2861 count = min((last_rec - recid + 1),
2862 (sector_t)count_to_trk_end);
2863 len_to_track_end = count * blksize;
2864 ccw[-1].flags |= CCW_FLAG_CC;
2865 ccw->cmd_code = cmd;
2866 ccw->count = len_to_track_end;
2867 ccw->cda = (__u32)(addr_t)idaws;
2868 ccw->flags = CCW_FLAG_IDA;
2869 ccw++;
2870 recid += count;
2871 new_track = 0;
2872 /* first idaw for a ccw may start anywhere */
2873 if (!idaw_dst)
2874 idaw_dst = dst;
2875 }
2876 /* If we start a new idaw, we must make sure that it
2877 * starts on an IDA_BLOCK_SIZE boundary.
2878 * If we continue an idaw, we must make sure that the
2879 * current segment begins where the so far accumulated
2880 * idaw ends
2881 */
2882 if (!idaw_dst) {
2883 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2884 dasd_sfree_request(cqr, startdev);
2885 return ERR_PTR(-ERANGE);
2886 } else
2887 idaw_dst = dst;
2888 }
2889 if ((idaw_dst + idaw_len) != dst) {
2890 dasd_sfree_request(cqr, startdev);
2891 return ERR_PTR(-ERANGE);
2892 }
2893 part_len = min(seg_len, len_to_track_end);
2894 seg_len -= part_len;
2895 dst += part_len;
2896 idaw_len += part_len;
2897 len_to_track_end -= part_len;
2898 /* collected memory area ends on an IDA_BLOCK border,
2899 * -> create an idaw
2900 * idal_create_words will handle cases where idaw_len
2901 * is larger then IDA_BLOCK_SIZE
2902 */
2903 if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2904 end_idaw = 1;
2905 /* We also need to end the idaw at track end */
2906 if (!len_to_track_end) {
2907 new_track = 1;
2908 end_idaw = 1;
2909 }
2910 if (end_idaw) {
2911 idaws = idal_create_words(idaws, idaw_dst,
2912 idaw_len);
2913 idaw_dst = NULL;
2914 idaw_len = 0;
2915 end_idaw = 0;
2916 }
2917 }
2918 }
2919
2920 if (blk_noretry_request(req) ||
2921 block->base->features & DASD_FEATURE_FAILFAST)
2922 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2923 cqr->startdev = startdev;
2924 cqr->memdev = startdev;
2925 cqr->block = block;
2926 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2927 cqr->lpm = startdev->path_data.ppm;
2928 cqr->retries = startdev->default_retries;
2929 cqr->buildclk = get_tod_clock();
2930 cqr->status = DASD_CQR_FILLED;
2931 return cqr;
2932 }
2933
2934 static int prepare_itcw(struct itcw *itcw,
2935 unsigned int trk, unsigned int totrk, int cmd,
2936 struct dasd_device *basedev,
2937 struct dasd_device *startdev,
2938 unsigned int rec_on_trk, int count,
2939 unsigned int blksize,
2940 unsigned int total_data_size,
2941 unsigned int tlf,
2942 unsigned int blk_per_trk)
2943 {
2944 struct PFX_eckd_data pfxdata;
2945 struct dasd_eckd_private *basepriv, *startpriv;
2946 struct DE_eckd_data *dedata;
2947 struct LRE_eckd_data *lredata;
2948 struct dcw *dcw;
2949
2950 u32 begcyl, endcyl;
2951 u16 heads, beghead, endhead;
2952 u8 pfx_cmd;
2953
2954 int rc = 0;
2955 int sector = 0;
2956 int dn, d;
2957
2958
2959 /* setup prefix data */
2960 basepriv = (struct dasd_eckd_private *) basedev->private;
2961 startpriv = (struct dasd_eckd_private *) startdev->private;
2962 dedata = &pfxdata.define_extent;
2963 lredata = &pfxdata.locate_record;
2964
2965 memset(&pfxdata, 0, sizeof(pfxdata));
2966 pfxdata.format = 1; /* PFX with LRE */
2967 pfxdata.base_address = basepriv->ned->unit_addr;
2968 pfxdata.base_lss = basepriv->ned->ID;
2969 pfxdata.validity.define_extent = 1;
2970
2971 /* private uid is kept up to date, conf_data may be outdated */
2972 if (startpriv->uid.type != UA_BASE_DEVICE) {
2973 pfxdata.validity.verify_base = 1;
2974 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2975 pfxdata.validity.hyper_pav = 1;
2976 }
2977
2978 switch (cmd) {
2979 case DASD_ECKD_CCW_READ_TRACK_DATA:
2980 dedata->mask.perm = 0x1;
2981 dedata->attributes.operation = basepriv->attrib.operation;
2982 dedata->blk_size = blksize;
2983 dedata->ga_extended |= 0x42;
2984 lredata->operation.orientation = 0x0;
2985 lredata->operation.operation = 0x0C;
2986 lredata->auxiliary.check_bytes = 0x01;
2987 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2988 break;
2989 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2990 dedata->mask.perm = 0x02;
2991 dedata->attributes.operation = basepriv->attrib.operation;
2992 dedata->blk_size = blksize;
2993 rc = check_XRC_on_prefix(&pfxdata, basedev);
2994 dedata->ga_extended |= 0x42;
2995 lredata->operation.orientation = 0x0;
2996 lredata->operation.operation = 0x3F;
2997 lredata->extended_operation = 0x23;
2998 lredata->auxiliary.check_bytes = 0x2;
2999 pfx_cmd = DASD_ECKD_CCW_PFX;
3000 break;
3001 default:
3002 DBF_DEV_EVENT(DBF_ERR, basedev,
3003 "prepare itcw, unknown opcode 0x%x", cmd);
3004 BUG();
3005 break;
3006 }
3007 if (rc)
3008 return rc;
3009
3010 dedata->attributes.mode = 0x3; /* ECKD */
3011
3012 heads = basepriv->rdc_data.trk_per_cyl;
3013 begcyl = trk / heads;
3014 beghead = trk % heads;
3015 endcyl = totrk / heads;
3016 endhead = totrk % heads;
3017
3018 /* check for sequential prestage - enhance cylinder range */
3019 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3020 dedata->attributes.operation == DASD_SEQ_ACCESS) {
3021
3022 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3023 endcyl += basepriv->attrib.nr_cyl;
3024 else
3025 endcyl = (basepriv->real_cyl - 1);
3026 }
3027
3028 set_ch_t(&dedata->beg_ext, begcyl, beghead);
3029 set_ch_t(&dedata->end_ext, endcyl, endhead);
3030
3031 dedata->ep_format = 0x20; /* records per track is valid */
3032 dedata->ep_rec_per_track = blk_per_trk;
3033
3034 if (rec_on_trk) {
3035 switch (basepriv->rdc_data.dev_type) {
3036 case 0x3390:
3037 dn = ceil_quot(blksize + 6, 232);
3038 d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3039 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3040 break;
3041 case 0x3380:
3042 d = 7 + ceil_quot(blksize + 12, 32);
3043 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3044 break;
3045 }
3046 }
3047
3048 lredata->auxiliary.length_valid = 1;
3049 lredata->auxiliary.length_scope = 1;
3050 lredata->auxiliary.imbedded_ccw_valid = 1;
3051 lredata->length = tlf;
3052 lredata->imbedded_ccw = cmd;
3053 lredata->count = count;
3054 lredata->sector = sector;
3055 set_ch_t(&lredata->seek_addr, begcyl, beghead);
3056 lredata->search_arg.cyl = lredata->seek_addr.cyl;
3057 lredata->search_arg.head = lredata->seek_addr.head;
3058 lredata->search_arg.record = rec_on_trk;
3059
3060 dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3061 &pfxdata, sizeof(pfxdata), total_data_size);
3062 return PTR_RET(dcw);
3063 }
3064
3065 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3066 struct dasd_device *startdev,
3067 struct dasd_block *block,
3068 struct request *req,
3069 sector_t first_rec,
3070 sector_t last_rec,
3071 sector_t first_trk,
3072 sector_t last_trk,
3073 unsigned int first_offs,
3074 unsigned int last_offs,
3075 unsigned int blk_per_trk,
3076 unsigned int blksize)
3077 {
3078 struct dasd_ccw_req *cqr;
3079 struct req_iterator iter;
3080 struct bio_vec bv;
3081 char *dst;
3082 unsigned int trkcount, ctidaw;
3083 unsigned char cmd;
3084 struct dasd_device *basedev;
3085 unsigned int tlf;
3086 struct itcw *itcw;
3087 struct tidaw *last_tidaw = NULL;
3088 int itcw_op;
3089 size_t itcw_size;
3090 u8 tidaw_flags;
3091 unsigned int seg_len, part_len, len_to_track_end;
3092 unsigned char new_track;
3093 sector_t recid, trkid;
3094 unsigned int offs;
3095 unsigned int count, count_to_trk_end;
3096 int ret;
3097
3098 basedev = block->base;
3099 if (rq_data_dir(req) == READ) {
3100 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3101 itcw_op = ITCW_OP_READ;
3102 } else if (rq_data_dir(req) == WRITE) {
3103 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3104 itcw_op = ITCW_OP_WRITE;
3105 } else
3106 return ERR_PTR(-EINVAL);
3107
3108 /* trackbased I/O needs address all memory via TIDAWs,
3109 * not just for 64 bit addresses. This allows us to map
3110 * each segment directly to one tidaw.
3111 * In the case of write requests, additional tidaws may
3112 * be needed when a segment crosses a track boundary.
3113 */
3114 trkcount = last_trk - first_trk + 1;
3115 ctidaw = 0;
3116 rq_for_each_segment(bv, req, iter) {
3117 ++ctidaw;
3118 }
3119 if (rq_data_dir(req) == WRITE)
3120 ctidaw += (last_trk - first_trk);
3121
3122 /* Allocate the ccw request. */
3123 itcw_size = itcw_calc_size(0, ctidaw, 0);
3124 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3125 if (IS_ERR(cqr))
3126 return cqr;
3127
3128 /* transfer length factor: how many bytes to read from the last track */
3129 if (first_trk == last_trk)
3130 tlf = last_offs - first_offs + 1;
3131 else
3132 tlf = last_offs + 1;
3133 tlf *= blksize;
3134
3135 itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3136 if (IS_ERR(itcw)) {
3137 ret = -EINVAL;
3138 goto out_error;
3139 }
3140 cqr->cpaddr = itcw_get_tcw(itcw);
3141 if (prepare_itcw(itcw, first_trk, last_trk,
3142 cmd, basedev, startdev,
3143 first_offs + 1,
3144 trkcount, blksize,
3145 (last_rec - first_rec + 1) * blksize,
3146 tlf, blk_per_trk) == -EAGAIN) {
3147 /* Clock not in sync and XRC is enabled.
3148 * Try again later.
3149 */
3150 ret = -EAGAIN;
3151 goto out_error;
3152 }
3153 len_to_track_end = 0;
3154 /*
3155 * A tidaw can address 4k of memory, but must not cross page boundaries
3156 * We can let the block layer handle this by setting
3157 * blk_queue_segment_boundary to page boundaries and
3158 * blk_max_segment_size to page size when setting up the request queue.
3159 * For write requests, a TIDAW must not cross track boundaries, because
3160 * we have to set the CBC flag on the last tidaw for each track.
3161 */
3162 if (rq_data_dir(req) == WRITE) {
3163 new_track = 1;
3164 recid = first_rec;
3165 rq_for_each_segment(bv, req, iter) {
3166 dst = page_address(bv.bv_page) + bv.bv_offset;
3167 seg_len = bv.bv_len;
3168 while (seg_len) {
3169 if (new_track) {
3170 trkid = recid;
3171 offs = sector_div(trkid, blk_per_trk);
3172 count_to_trk_end = blk_per_trk - offs;
3173 count = min((last_rec - recid + 1),
3174 (sector_t)count_to_trk_end);
3175 len_to_track_end = count * blksize;
3176 recid += count;
3177 new_track = 0;
3178 }
3179 part_len = min(seg_len, len_to_track_end);
3180 seg_len -= part_len;
3181 len_to_track_end -= part_len;
3182 /* We need to end the tidaw at track end */
3183 if (!len_to_track_end) {
3184 new_track = 1;
3185 tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3186 } else
3187 tidaw_flags = 0;
3188 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3189 dst, part_len);
3190 if (IS_ERR(last_tidaw)) {
3191 ret = -EINVAL;
3192 goto out_error;
3193 }
3194 dst += part_len;
3195 }
3196 }
3197 } else {
3198 rq_for_each_segment(bv, req, iter) {
3199 dst = page_address(bv.bv_page) + bv.bv_offset;
3200 last_tidaw = itcw_add_tidaw(itcw, 0x00,
3201 dst, bv.bv_len);
3202 if (IS_ERR(last_tidaw)) {
3203 ret = -EINVAL;
3204 goto out_error;
3205 }
3206 }
3207 }
3208 last_tidaw->flags |= TIDAW_FLAGS_LAST;
3209 last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3210 itcw_finalize(itcw);
3211
3212 if (blk_noretry_request(req) ||
3213 block->base->features & DASD_FEATURE_FAILFAST)
3214 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3215 cqr->cpmode = 1;
3216 cqr->startdev = startdev;
3217 cqr->memdev = startdev;
3218 cqr->block = block;
3219 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
3220 cqr->lpm = startdev->path_data.ppm;
3221 cqr->retries = startdev->default_retries;
3222 cqr->buildclk = get_tod_clock();
3223 cqr->status = DASD_CQR_FILLED;
3224 return cqr;
3225 out_error:
3226 dasd_sfree_request(cqr, startdev);
3227 return ERR_PTR(ret);
3228 }
3229
3230 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3231 struct dasd_block *block,
3232 struct request *req)
3233 {
3234 int cmdrtd, cmdwtd;
3235 int use_prefix;
3236 int fcx_multitrack;
3237 struct dasd_eckd_private *private;
3238 struct dasd_device *basedev;
3239 sector_t first_rec, last_rec;
3240 sector_t first_trk, last_trk;
3241 unsigned int first_offs, last_offs;
3242 unsigned int blk_per_trk, blksize;
3243 int cdlspecial;
3244 unsigned int data_size;
3245 struct dasd_ccw_req *cqr;
3246
3247 basedev = block->base;
3248 private = (struct dasd_eckd_private *) basedev->private;
3249
3250 /* Calculate number of blocks/records per track. */
3251 blksize = block->bp_block;
3252 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3253 if (blk_per_trk == 0)
3254 return ERR_PTR(-EINVAL);
3255 /* Calculate record id of first and last block. */
3256 first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3257 first_offs = sector_div(first_trk, blk_per_trk);
3258 last_rec = last_trk =
3259 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3260 last_offs = sector_div(last_trk, blk_per_trk);
3261 cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3262
3263 fcx_multitrack = private->features.feature[40] & 0x20;
3264 data_size = blk_rq_bytes(req);
3265 if (data_size % blksize)
3266 return ERR_PTR(-EINVAL);
3267 /* tpm write request add CBC data on each track boundary */
3268 if (rq_data_dir(req) == WRITE)
3269 data_size += (last_trk - first_trk) * 4;
3270
3271 /* is read track data and write track data in command mode supported? */
3272 cmdrtd = private->features.feature[9] & 0x20;
3273 cmdwtd = private->features.feature[12] & 0x40;
3274 use_prefix = private->features.feature[8] & 0x01;
3275
3276 cqr = NULL;
3277 if (cdlspecial || dasd_page_cache) {
3278 /* do nothing, just fall through to the cmd mode single case */
3279 } else if ((data_size <= private->fcx_max_data)
3280 && (fcx_multitrack || (first_trk == last_trk))) {
3281 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3282 first_rec, last_rec,
3283 first_trk, last_trk,
3284 first_offs, last_offs,
3285 blk_per_trk, blksize);
3286 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3287 (PTR_ERR(cqr) != -ENOMEM))
3288 cqr = NULL;
3289 } else if (use_prefix &&
3290 (((rq_data_dir(req) == READ) && cmdrtd) ||
3291 ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3292 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3293 first_rec, last_rec,
3294 first_trk, last_trk,
3295 first_offs, last_offs,
3296 blk_per_trk, blksize);
3297 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3298 (PTR_ERR(cqr) != -ENOMEM))
3299 cqr = NULL;
3300 }
3301 if (!cqr)
3302 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3303 first_rec, last_rec,
3304 first_trk, last_trk,
3305 first_offs, last_offs,
3306 blk_per_trk, blksize);
3307 return cqr;
3308 }
3309
3310 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3311 struct dasd_block *block,
3312 struct request *req)
3313 {
3314 unsigned long *idaws;
3315 struct dasd_device *basedev;
3316 struct dasd_ccw_req *cqr;
3317 struct ccw1 *ccw;
3318 struct req_iterator iter;
3319 struct bio_vec bv;
3320 char *dst;
3321 unsigned char cmd;
3322 unsigned int trkcount;
3323 unsigned int seg_len, len_to_track_end;
3324 unsigned int first_offs;
3325 unsigned int cidaw, cplength, datasize;
3326 sector_t first_trk, last_trk, sectors;
3327 sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3328 unsigned int pfx_datasize;
3329
3330 /*
3331 * raw track access needs to be mutiple of 64k and on 64k boundary
3332 * For read requests we can fix an incorrect alignment by padding
3333 * the request with dummy pages.
3334 */
3335 start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3336 end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3337 DASD_RAW_SECTORS_PER_TRACK;
3338 end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3339 DASD_RAW_SECTORS_PER_TRACK;
3340 basedev = block->base;
3341 if ((start_padding_sectors || end_padding_sectors) &&
3342 (rq_data_dir(req) == WRITE)) {
3343 DBF_DEV_EVENT(DBF_ERR, basedev,
3344 "raw write not track aligned (%lu,%lu) req %p",
3345 start_padding_sectors, end_padding_sectors, req);
3346 cqr = ERR_PTR(-EINVAL);
3347 goto out;
3348 }
3349
3350 first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3351 last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3352 DASD_RAW_SECTORS_PER_TRACK;
3353 trkcount = last_trk - first_trk + 1;
3354 first_offs = 0;
3355
3356 if (rq_data_dir(req) == READ)
3357 cmd = DASD_ECKD_CCW_READ_TRACK;
3358 else if (rq_data_dir(req) == WRITE)
3359 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3360 else {
3361 cqr = ERR_PTR(-EINVAL);
3362 goto out;
3363 }
3364
3365 /*
3366 * Raw track based I/O needs IDAWs for each page,
3367 * and not just for 64 bit addresses.
3368 */
3369 cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3370
3371 /* 1x prefix + one read/write ccw per track */
3372 cplength = 1 + trkcount;
3373
3374 /*
3375 * struct PFX_eckd_data has up to 2 byte as extended parameter
3376 * this is needed for write full track and has to be mentioned
3377 * separately
3378 * add 8 instead of 2 to keep 8 byte boundary
3379 */
3380 pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3381
3382 datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3383
3384 /* Allocate the ccw request. */
3385 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3386 datasize, startdev);
3387 if (IS_ERR(cqr))
3388 goto out;
3389 ccw = cqr->cpaddr;
3390
3391 if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3392 basedev, startdev, 1 /* format */, first_offs + 1,
3393 trkcount, 0, 0) == -EAGAIN) {
3394 /* Clock not in sync and XRC is enabled.
3395 * Try again later.
3396 */
3397 dasd_sfree_request(cqr, startdev);
3398 cqr = ERR_PTR(-EAGAIN);
3399 goto out;
3400 }
3401
3402 idaws = (unsigned long *)(cqr->data + pfx_datasize);
3403 len_to_track_end = 0;
3404 if (start_padding_sectors) {
3405 ccw[-1].flags |= CCW_FLAG_CC;
3406 ccw->cmd_code = cmd;
3407 /* maximum 3390 track size */
3408 ccw->count = 57326;
3409 /* 64k map to one track */
3410 len_to_track_end = 65536 - start_padding_sectors * 512;
3411 ccw->cda = (__u32)(addr_t)idaws;
3412 ccw->flags |= CCW_FLAG_IDA;
3413 ccw->flags |= CCW_FLAG_SLI;
3414 ccw++;
3415 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3416 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3417 }
3418 rq_for_each_segment(bv, req, iter) {
3419 dst = page_address(bv.bv_page) + bv.bv_offset;
3420 seg_len = bv.bv_len;
3421 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3422 memset(dst, 0, seg_len);
3423 if (!len_to_track_end) {
3424 ccw[-1].flags |= CCW_FLAG_CC;
3425 ccw->cmd_code = cmd;
3426 /* maximum 3390 track size */
3427 ccw->count = 57326;
3428 /* 64k map to one track */
3429 len_to_track_end = 65536;
3430 ccw->cda = (__u32)(addr_t)idaws;
3431 ccw->flags |= CCW_FLAG_IDA;
3432 ccw->flags |= CCW_FLAG_SLI;
3433 ccw++;
3434 }
3435 len_to_track_end -= seg_len;
3436 idaws = idal_create_words(idaws, dst, seg_len);
3437 }
3438 for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3439 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3440 if (blk_noretry_request(req) ||
3441 block->base->features & DASD_FEATURE_FAILFAST)
3442 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3443 cqr->startdev = startdev;
3444 cqr->memdev = startdev;
3445 cqr->block = block;
3446 cqr->expires = startdev->default_expires * HZ;
3447 cqr->lpm = startdev->path_data.ppm;
3448 cqr->retries = startdev->default_retries;
3449 cqr->buildclk = get_tod_clock();
3450 cqr->status = DASD_CQR_FILLED;
3451
3452 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3453 cqr = NULL;
3454 out:
3455 return cqr;
3456 }
3457
3458
3459 static int
3460 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3461 {
3462 struct dasd_eckd_private *private;
3463 struct ccw1 *ccw;
3464 struct req_iterator iter;
3465 struct bio_vec bv;
3466 char *dst, *cda;
3467 unsigned int blksize, blk_per_trk, off;
3468 sector_t recid;
3469 int status;
3470
3471 if (!dasd_page_cache)
3472 goto out;
3473 private = (struct dasd_eckd_private *) cqr->block->base->private;
3474 blksize = cqr->block->bp_block;
3475 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3476 recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3477 ccw = cqr->cpaddr;
3478 /* Skip over define extent & locate record. */
3479 ccw++;
3480 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3481 ccw++;
3482 rq_for_each_segment(bv, req, iter) {
3483 dst = page_address(bv.bv_page) + bv.bv_offset;
3484 for (off = 0; off < bv.bv_len; off += blksize) {
3485 /* Skip locate record. */
3486 if (private->uses_cdl && recid <= 2*blk_per_trk)
3487 ccw++;
3488 if (dst) {
3489 if (ccw->flags & CCW_FLAG_IDA)
3490 cda = *((char **)((addr_t) ccw->cda));
3491 else
3492 cda = (char *)((addr_t) ccw->cda);
3493 if (dst != cda) {
3494 if (rq_data_dir(req) == READ)
3495 memcpy(dst, cda, bv.bv_len);
3496 kmem_cache_free(dasd_page_cache,
3497 (void *)((addr_t)cda & PAGE_MASK));
3498 }
3499 dst = NULL;
3500 }
3501 ccw++;
3502 recid++;
3503 }
3504 }
3505 out:
3506 status = cqr->status == DASD_CQR_DONE;
3507 dasd_sfree_request(cqr, cqr->memdev);
3508 return status;
3509 }
3510
3511 /*
3512 * Modify ccw/tcw in cqr so it can be started on a base device.
3513 *
3514 * Note that this is not enough to restart the cqr!
3515 * Either reset cqr->startdev as well (summary unit check handling)
3516 * or restart via separate cqr (as in ERP handling).
3517 */
3518 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3519 {
3520 struct ccw1 *ccw;
3521 struct PFX_eckd_data *pfxdata;
3522 struct tcw *tcw;
3523 struct tccb *tccb;
3524 struct dcw *dcw;
3525
3526 if (cqr->cpmode == 1) {
3527 tcw = cqr->cpaddr;
3528 tccb = tcw_get_tccb(tcw);
3529 dcw = (struct dcw *)&tccb->tca[0];
3530 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3531 pfxdata->validity.verify_base = 0;
3532 pfxdata->validity.hyper_pav = 0;
3533 } else {
3534 ccw = cqr->cpaddr;
3535 pfxdata = cqr->data;
3536 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3537 pfxdata->validity.verify_base = 0;
3538 pfxdata->validity.hyper_pav = 0;
3539 }
3540 }
3541 }
3542
3543 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3544
3545 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3546 struct dasd_block *block,
3547 struct request *req)
3548 {
3549 struct dasd_eckd_private *private;
3550 struct dasd_device *startdev;
3551 unsigned long flags;
3552 struct dasd_ccw_req *cqr;
3553
3554 startdev = dasd_alias_get_start_dev(base);
3555 if (!startdev)
3556 startdev = base;
3557 private = (struct dasd_eckd_private *) startdev->private;
3558 if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3559 return ERR_PTR(-EBUSY);
3560
3561 spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3562 private->count++;
3563 if ((base->features & DASD_FEATURE_USERAW))
3564 cqr = dasd_raw_build_cp(startdev, block, req);
3565 else
3566 cqr = dasd_eckd_build_cp(startdev, block, req);
3567 if (IS_ERR(cqr))
3568 private->count--;
3569 spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3570 return cqr;
3571 }
3572
3573 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3574 struct request *req)
3575 {
3576 struct dasd_eckd_private *private;
3577 unsigned long flags;
3578
3579 spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3580 private = (struct dasd_eckd_private *) cqr->memdev->private;
3581 private->count--;
3582 spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3583 return dasd_eckd_free_cp(cqr, req);
3584 }
3585
3586 static int
3587 dasd_eckd_fill_info(struct dasd_device * device,
3588 struct dasd_information2_t * info)
3589 {
3590 struct dasd_eckd_private *private;
3591
3592 private = (struct dasd_eckd_private *) device->private;
3593 info->label_block = 2;
3594 info->FBA_layout = private->uses_cdl ? 0 : 1;
3595 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3596 info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3597 memcpy(info->characteristics, &private->rdc_data,
3598 sizeof(struct dasd_eckd_characteristics));
3599 info->confdata_size = min((unsigned long)private->conf_len,
3600 sizeof(info->configuration_data));
3601 memcpy(info->configuration_data, private->conf_data,
3602 info->confdata_size);
3603 return 0;
3604 }
3605
3606 /*
3607 * SECTION: ioctl functions for eckd devices.
3608 */
3609
3610 /*
3611 * Release device ioctl.
3612 * Buils a channel programm to releases a prior reserved
3613 * (see dasd_eckd_reserve) device.
3614 */
3615 static int
3616 dasd_eckd_release(struct dasd_device *device)
3617 {
3618 struct dasd_ccw_req *cqr;
3619 int rc;
3620 struct ccw1 *ccw;
3621 int useglobal;
3622
3623 if (!capable(CAP_SYS_ADMIN))
3624 return -EACCES;
3625
3626 useglobal = 0;
3627 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3628 if (IS_ERR(cqr)) {
3629 mutex_lock(&dasd_reserve_mutex);
3630 useglobal = 1;
3631 cqr = &dasd_reserve_req->cqr;
3632 memset(cqr, 0, sizeof(*cqr));
3633 memset(&dasd_reserve_req->ccw, 0,
3634 sizeof(dasd_reserve_req->ccw));
3635 cqr->cpaddr = &dasd_reserve_req->ccw;
3636 cqr->data = &dasd_reserve_req->data;
3637 cqr->magic = DASD_ECKD_MAGIC;
3638 }
3639 ccw = cqr->cpaddr;
3640 ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3641 ccw->flags |= CCW_FLAG_SLI;
3642 ccw->count = 32;
3643 ccw->cda = (__u32)(addr_t) cqr->data;
3644 cqr->startdev = device;
3645 cqr->memdev = device;
3646 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3647 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3648 cqr->retries = 2; /* set retry counter to enable basic ERP */
3649 cqr->expires = 2 * HZ;
3650 cqr->buildclk = get_tod_clock();
3651 cqr->status = DASD_CQR_FILLED;
3652
3653 rc = dasd_sleep_on_immediatly(cqr);
3654 if (!rc)
3655 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3656
3657 if (useglobal)
3658 mutex_unlock(&dasd_reserve_mutex);
3659 else
3660 dasd_sfree_request(cqr, cqr->memdev);
3661 return rc;
3662 }
3663
3664 /*
3665 * Reserve device ioctl.
3666 * Options are set to 'synchronous wait for interrupt' and
3667 * 'timeout the request'. This leads to a terminate IO if
3668 * the interrupt is outstanding for a certain time.
3669 */
3670 static int
3671 dasd_eckd_reserve(struct dasd_device *device)
3672 {
3673 struct dasd_ccw_req *cqr;
3674 int rc;
3675 struct ccw1 *ccw;
3676 int useglobal;
3677
3678 if (!capable(CAP_SYS_ADMIN))
3679 return -EACCES;
3680
3681 useglobal = 0;
3682 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3683 if (IS_ERR(cqr)) {
3684 mutex_lock(&dasd_reserve_mutex);
3685 useglobal = 1;
3686 cqr = &dasd_reserve_req->cqr;
3687 memset(cqr, 0, sizeof(*cqr));
3688 memset(&dasd_reserve_req->ccw, 0,
3689 sizeof(dasd_reserve_req->ccw));
3690 cqr->cpaddr = &dasd_reserve_req->ccw;
3691 cqr->data = &dasd_reserve_req->data;
3692 cqr->magic = DASD_ECKD_MAGIC;
3693 }
3694 ccw = cqr->cpaddr;
3695 ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3696 ccw->flags |= CCW_FLAG_SLI;
3697 ccw->count = 32;
3698 ccw->cda = (__u32)(addr_t) cqr->data;
3699 cqr->startdev = device;
3700 cqr->memdev = device;
3701 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3702 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3703 cqr->retries = 2; /* set retry counter to enable basic ERP */
3704 cqr->expires = 2 * HZ;
3705 cqr->buildclk = get_tod_clock();
3706 cqr->status = DASD_CQR_FILLED;
3707
3708 rc = dasd_sleep_on_immediatly(cqr);
3709 if (!rc)
3710 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3711
3712 if (useglobal)
3713 mutex_unlock(&dasd_reserve_mutex);
3714 else
3715 dasd_sfree_request(cqr, cqr->memdev);
3716 return rc;
3717 }
3718
3719 /*
3720 * Steal lock ioctl - unconditional reserve device.
3721 * Buils a channel programm to break a device's reservation.
3722 * (unconditional reserve)
3723 */
3724 static int
3725 dasd_eckd_steal_lock(struct dasd_device *device)
3726 {
3727 struct dasd_ccw_req *cqr;
3728 int rc;
3729 struct ccw1 *ccw;
3730 int useglobal;
3731
3732 if (!capable(CAP_SYS_ADMIN))
3733 return -EACCES;
3734
3735 useglobal = 0;
3736 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3737 if (IS_ERR(cqr)) {
3738 mutex_lock(&dasd_reserve_mutex);
3739 useglobal = 1;
3740 cqr = &dasd_reserve_req->cqr;
3741 memset(cqr, 0, sizeof(*cqr));
3742 memset(&dasd_reserve_req->ccw, 0,
3743 sizeof(dasd_reserve_req->ccw));
3744 cqr->cpaddr = &dasd_reserve_req->ccw;
3745 cqr->data = &dasd_reserve_req->data;
3746 cqr->magic = DASD_ECKD_MAGIC;
3747 }
3748 ccw = cqr->cpaddr;
3749 ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3750 ccw->flags |= CCW_FLAG_SLI;
3751 ccw->count = 32;
3752 ccw->cda = (__u32)(addr_t) cqr->data;
3753 cqr->startdev = device;
3754 cqr->memdev = device;
3755 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3756 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3757 cqr->retries = 2; /* set retry counter to enable basic ERP */
3758 cqr->expires = 2 * HZ;
3759 cqr->buildclk = get_tod_clock();
3760 cqr->status = DASD_CQR_FILLED;
3761
3762 rc = dasd_sleep_on_immediatly(cqr);
3763 if (!rc)
3764 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3765
3766 if (useglobal)
3767 mutex_unlock(&dasd_reserve_mutex);
3768 else
3769 dasd_sfree_request(cqr, cqr->memdev);
3770 return rc;
3771 }
3772
3773 /*
3774 * SNID - Sense Path Group ID
3775 * This ioctl may be used in situations where I/O is stalled due to
3776 * a reserve, so if the normal dasd_smalloc_request fails, we use the
3777 * preallocated dasd_reserve_req.
3778 */
3779 static int dasd_eckd_snid(struct dasd_device *device,
3780 void __user *argp)
3781 {
3782 struct dasd_ccw_req *cqr;
3783 int rc;
3784 struct ccw1 *ccw;
3785 int useglobal;
3786 struct dasd_snid_ioctl_data usrparm;
3787
3788 if (!capable(CAP_SYS_ADMIN))
3789 return -EACCES;
3790
3791 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3792 return -EFAULT;
3793
3794 useglobal = 0;
3795 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3796 sizeof(struct dasd_snid_data), device);
3797 if (IS_ERR(cqr)) {
3798 mutex_lock(&dasd_reserve_mutex);
3799 useglobal = 1;
3800 cqr = &dasd_reserve_req->cqr;
3801 memset(cqr, 0, sizeof(*cqr));
3802 memset(&dasd_reserve_req->ccw, 0,
3803 sizeof(dasd_reserve_req->ccw));
3804 cqr->cpaddr = &dasd_reserve_req->ccw;
3805 cqr->data = &dasd_reserve_req->data;
3806 cqr->magic = DASD_ECKD_MAGIC;
3807 }
3808 ccw = cqr->cpaddr;
3809 ccw->cmd_code = DASD_ECKD_CCW_SNID;
3810 ccw->flags |= CCW_FLAG_SLI;
3811 ccw->count = 12;
3812 ccw->cda = (__u32)(addr_t) cqr->data;
3813 cqr->startdev = device;
3814 cqr->memdev = device;
3815 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3816 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3817 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3818 cqr->retries = 5;
3819 cqr->expires = 10 * HZ;
3820 cqr->buildclk = get_tod_clock();
3821 cqr->status = DASD_CQR_FILLED;
3822 cqr->lpm = usrparm.path_mask;
3823
3824 rc = dasd_sleep_on_immediatly(cqr);
3825 /* verify that I/O processing didn't modify the path mask */
3826 if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3827 rc = -EIO;
3828 if (!rc) {
3829 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3830 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3831 rc = -EFAULT;
3832 }
3833
3834 if (useglobal)
3835 mutex_unlock(&dasd_reserve_mutex);
3836 else
3837 dasd_sfree_request(cqr, cqr->memdev);
3838 return rc;
3839 }
3840
3841 /*
3842 * Read performance statistics
3843 */
3844 static int
3845 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3846 {
3847 struct dasd_psf_prssd_data *prssdp;
3848 struct dasd_rssd_perf_stats_t *stats;
3849 struct dasd_ccw_req *cqr;
3850 struct ccw1 *ccw;
3851 int rc;
3852
3853 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
3854 (sizeof(struct dasd_psf_prssd_data) +
3855 sizeof(struct dasd_rssd_perf_stats_t)),
3856 device);
3857 if (IS_ERR(cqr)) {
3858 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3859 "Could not allocate initialization request");
3860 return PTR_ERR(cqr);
3861 }
3862 cqr->startdev = device;
3863 cqr->memdev = device;
3864 cqr->retries = 0;
3865 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3866 cqr->expires = 10 * HZ;
3867
3868 /* Prepare for Read Subsystem Data */
3869 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3870 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3871 prssdp->order = PSF_ORDER_PRSSD;
3872 prssdp->suborder = 0x01; /* Performance Statistics */
3873 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
3874
3875 ccw = cqr->cpaddr;
3876 ccw->cmd_code = DASD_ECKD_CCW_PSF;
3877 ccw->count = sizeof(struct dasd_psf_prssd_data);
3878 ccw->flags |= CCW_FLAG_CC;
3879 ccw->cda = (__u32)(addr_t) prssdp;
3880
3881 /* Read Subsystem Data - Performance Statistics */
3882 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3883 memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3884
3885 ccw++;
3886 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3887 ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3888 ccw->cda = (__u32)(addr_t) stats;
3889
3890 cqr->buildclk = get_tod_clock();
3891 cqr->status = DASD_CQR_FILLED;
3892 rc = dasd_sleep_on(cqr);
3893 if (rc == 0) {
3894 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3895 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3896 if (copy_to_user(argp, stats,
3897 sizeof(struct dasd_rssd_perf_stats_t)))
3898 rc = -EFAULT;
3899 }
3900 dasd_sfree_request(cqr, cqr->memdev);
3901 return rc;
3902 }
3903
3904 /*
3905 * Get attributes (cache operations)
3906 * Returnes the cache attributes used in Define Extend (DE).
3907 */
3908 static int
3909 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3910 {
3911 struct dasd_eckd_private *private =
3912 (struct dasd_eckd_private *)device->private;
3913 struct attrib_data_t attrib = private->attrib;
3914 int rc;
3915
3916 if (!capable(CAP_SYS_ADMIN))
3917 return -EACCES;
3918 if (!argp)
3919 return -EINVAL;
3920
3921 rc = 0;
3922 if (copy_to_user(argp, (long *) &attrib,
3923 sizeof(struct attrib_data_t)))
3924 rc = -EFAULT;
3925
3926 return rc;
3927 }
3928
3929 /*
3930 * Set attributes (cache operations)
3931 * Stores the attributes for cache operation to be used in Define Extend (DE).
3932 */
3933 static int
3934 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3935 {
3936 struct dasd_eckd_private *private =
3937 (struct dasd_eckd_private *)device->private;
3938 struct attrib_data_t attrib;
3939
3940 if (!capable(CAP_SYS_ADMIN))
3941 return -EACCES;
3942 if (!argp)
3943 return -EINVAL;
3944
3945 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3946 return -EFAULT;
3947 private->attrib = attrib;
3948
3949 dev_info(&device->cdev->dev,
3950 "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3951 private->attrib.operation, private->attrib.nr_cyl);
3952 return 0;
3953 }
3954
3955 /*
3956 * Issue syscall I/O to EMC Symmetrix array.
3957 * CCWs are PSF and RSSD
3958 */
3959 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3960 {
3961 struct dasd_symmio_parms usrparm;
3962 char *psf_data, *rssd_result;
3963 struct dasd_ccw_req *cqr;
3964 struct ccw1 *ccw;
3965 char psf0, psf1;
3966 int rc;
3967
3968 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3969 return -EACCES;
3970 psf0 = psf1 = 0;
3971
3972 /* Copy parms from caller */
3973 rc = -EFAULT;
3974 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3975 goto out;
3976 if (is_compat_task() || sizeof(long) == 4) {
3977 /* Make sure pointers are sane even on 31 bit. */
3978 rc = -EINVAL;
3979 if ((usrparm.psf_data >> 32) != 0)
3980 goto out;
3981 if ((usrparm.rssd_result >> 32) != 0)
3982 goto out;
3983 usrparm.psf_data &= 0x7fffffffULL;
3984 usrparm.rssd_result &= 0x7fffffffULL;
3985 }
3986 /* alloc I/O data area */
3987 psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3988 rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3989 if (!psf_data || !rssd_result) {
3990 rc = -ENOMEM;
3991 goto out_free;
3992 }
3993
3994 /* get syscall header from user space */
3995 rc = -EFAULT;
3996 if (copy_from_user(psf_data,
3997 (void __user *)(unsigned long) usrparm.psf_data,
3998 usrparm.psf_data_len))
3999 goto out_free;
4000 psf0 = psf_data[0];
4001 psf1 = psf_data[1];
4002
4003 /* setup CCWs for PSF + RSSD */
4004 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
4005 if (IS_ERR(cqr)) {
4006 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4007 "Could not allocate initialization request");
4008 rc = PTR_ERR(cqr);
4009 goto out_free;
4010 }
4011
4012 cqr->startdev = device;
4013 cqr->memdev = device;
4014 cqr->retries = 3;
4015 cqr->expires = 10 * HZ;
4016 cqr->buildclk = get_tod_clock();
4017 cqr->status = DASD_CQR_FILLED;
4018
4019 /* Build the ccws */
4020 ccw = cqr->cpaddr;
4021
4022 /* PSF ccw */
4023 ccw->cmd_code = DASD_ECKD_CCW_PSF;
4024 ccw->count = usrparm.psf_data_len;
4025 ccw->flags |= CCW_FLAG_CC;
4026 ccw->cda = (__u32)(addr_t) psf_data;
4027
4028 ccw++;
4029
4030 /* RSSD ccw */
4031 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4032 ccw->count = usrparm.rssd_result_len;
4033 ccw->flags = CCW_FLAG_SLI ;
4034 ccw->cda = (__u32)(addr_t) rssd_result;
4035
4036 rc = dasd_sleep_on(cqr);
4037 if (rc)
4038 goto out_sfree;
4039
4040 rc = -EFAULT;
4041 if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4042 rssd_result, usrparm.rssd_result_len))
4043 goto out_sfree;
4044 rc = 0;
4045
4046 out_sfree:
4047 dasd_sfree_request(cqr, cqr->memdev);
4048 out_free:
4049 kfree(rssd_result);
4050 kfree(psf_data);
4051 out:
4052 DBF_DEV_EVENT(DBF_WARNING, device,
4053 "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4054 (int) psf0, (int) psf1, rc);
4055 return rc;
4056 }
4057
4058 static int
4059 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4060 {
4061 struct dasd_device *device = block->base;
4062
4063 switch (cmd) {
4064 case BIODASDGATTR:
4065 return dasd_eckd_get_attrib(device, argp);
4066 case BIODASDSATTR:
4067 return dasd_eckd_set_attrib(device, argp);
4068 case BIODASDPSRD:
4069 return dasd_eckd_performance(device, argp);
4070 case BIODASDRLSE:
4071 return dasd_eckd_release(device);
4072 case BIODASDRSRV:
4073 return dasd_eckd_reserve(device);
4074 case BIODASDSLCK:
4075 return dasd_eckd_steal_lock(device);
4076 case BIODASDSNID:
4077 return dasd_eckd_snid(device, argp);
4078 case BIODASDSYMMIO:
4079 return dasd_symm_io(device, argp);
4080 default:
4081 return -ENOTTY;
4082 }
4083 }
4084
4085 /*
4086 * Dump the range of CCWs into 'page' buffer
4087 * and return number of printed chars.
4088 */
4089 static int
4090 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4091 {
4092 int len, count;
4093 char *datap;
4094
4095 len = 0;
4096 while (from <= to) {
4097 len += sprintf(page + len, PRINTK_HEADER
4098 " CCW %p: %08X %08X DAT:",
4099 from, ((int *) from)[0], ((int *) from)[1]);
4100
4101 /* get pointer to data (consider IDALs) */
4102 if (from->flags & CCW_FLAG_IDA)
4103 datap = (char *) *((addr_t *) (addr_t) from->cda);
4104 else
4105 datap = (char *) ((addr_t) from->cda);
4106
4107 /* dump data (max 32 bytes) */
4108 for (count = 0; count < from->count && count < 32; count++) {
4109 if (count % 8 == 0) len += sprintf(page + len, " ");
4110 if (count % 4 == 0) len += sprintf(page + len, " ");
4111 len += sprintf(page + len, "%02x", datap[count]);
4112 }
4113 len += sprintf(page + len, "\n");
4114 from++;
4115 }
4116 return len;
4117 }
4118
4119 static void
4120 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4121 char *reason)
4122 {
4123 u64 *sense;
4124 u64 *stat;
4125
4126 sense = (u64 *) dasd_get_sense(irb);
4127 stat = (u64 *) &irb->scsw;
4128 if (sense) {
4129 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4130 "%016llx %016llx %016llx %016llx",
4131 reason, *stat, *((u32 *) (stat + 1)),
4132 sense[0], sense[1], sense[2], sense[3]);
4133 } else {
4134 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4135 reason, *stat, *((u32 *) (stat + 1)),
4136 "NO VALID SENSE");
4137 }
4138 }
4139
4140 /*
4141 * Print sense data and related channel program.
4142 * Parts are printed because printk buffer is only 1024 bytes.
4143 */
4144 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4145 struct dasd_ccw_req *req, struct irb *irb)
4146 {
4147 char *page;
4148 struct ccw1 *first, *last, *fail, *from, *to;
4149 int len, sl, sct;
4150
4151 page = (char *) get_zeroed_page(GFP_ATOMIC);
4152 if (page == NULL) {
4153 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4154 "No memory to dump sense data\n");
4155 return;
4156 }
4157 /* dump the sense data */
4158 len = sprintf(page, PRINTK_HEADER
4159 " I/O status report for device %s:\n",
4160 dev_name(&device->cdev->dev));
4161 len += sprintf(page + len, PRINTK_HEADER
4162 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4163 "CS:%02X RC:%d\n",
4164 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4165 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4166 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4167 req ? req->intrc : 0);
4168 len += sprintf(page + len, PRINTK_HEADER
4169 " device %s: Failing CCW: %p\n",
4170 dev_name(&device->cdev->dev),
4171 (void *) (addr_t) irb->scsw.cmd.cpa);
4172 if (irb->esw.esw0.erw.cons) {
4173 for (sl = 0; sl < 4; sl++) {
4174 len += sprintf(page + len, PRINTK_HEADER
4175 " Sense(hex) %2d-%2d:",
4176 (8 * sl), ((8 * sl) + 7));
4177
4178 for (sct = 0; sct < 8; sct++) {
4179 len += sprintf(page + len, " %02x",
4180 irb->ecw[8 * sl + sct]);
4181 }
4182 len += sprintf(page + len, "\n");
4183 }
4184
4185 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4186 /* 24 Byte Sense Data */
4187 sprintf(page + len, PRINTK_HEADER
4188 " 24 Byte: %x MSG %x, "
4189 "%s MSGb to SYSOP\n",
4190 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4191 irb->ecw[1] & 0x10 ? "" : "no");
4192 } else {
4193 /* 32 Byte Sense Data */
4194 sprintf(page + len, PRINTK_HEADER
4195 " 32 Byte: Format: %x "
4196 "Exception class %x\n",
4197 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4198 }
4199 } else {
4200 sprintf(page + len, PRINTK_HEADER
4201 " SORRY - NO VALID SENSE AVAILABLE\n");
4202 }
4203 printk(KERN_ERR "%s", page);
4204
4205 if (req) {
4206 /* req == NULL for unsolicited interrupts */
4207 /* dump the Channel Program (max 140 Bytes per line) */
4208 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4209 first = req->cpaddr;
4210 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4211 to = min(first + 6, last);
4212 len = sprintf(page, PRINTK_HEADER
4213 " Related CP in req: %p\n", req);
4214 dasd_eckd_dump_ccw_range(first, to, page + len);
4215 printk(KERN_ERR "%s", page);
4216
4217 /* print failing CCW area (maximum 4) */
4218 /* scsw->cda is either valid or zero */
4219 len = 0;
4220 from = ++to;
4221 fail = (struct ccw1 *)(addr_t)
4222 irb->scsw.cmd.cpa; /* failing CCW */
4223 if (from < fail - 2) {
4224 from = fail - 2; /* there is a gap - print header */
4225 len += sprintf(page, PRINTK_HEADER "......\n");
4226 }
4227 to = min(fail + 1, last);
4228 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4229
4230 /* print last CCWs (maximum 2) */
4231 from = max(from, ++to);
4232 if (from < last - 1) {
4233 from = last - 1; /* there is a gap - print header */
4234 len += sprintf(page + len, PRINTK_HEADER "......\n");
4235 }
4236 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4237 if (len > 0)
4238 printk(KERN_ERR "%s", page);
4239 }
4240 free_page((unsigned long) page);
4241 }
4242
4243
4244 /*
4245 * Print sense data from a tcw.
4246 */
4247 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4248 struct dasd_ccw_req *req, struct irb *irb)
4249 {
4250 char *page;
4251 int len, sl, sct, residual;
4252 struct tsb *tsb;
4253 u8 *sense, *rcq;
4254
4255 page = (char *) get_zeroed_page(GFP_ATOMIC);
4256 if (page == NULL) {
4257 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4258 "No memory to dump sense data");
4259 return;
4260 }
4261 /* dump the sense data */
4262 len = sprintf(page, PRINTK_HEADER
4263 " I/O status report for device %s:\n",
4264 dev_name(&device->cdev->dev));
4265 len += sprintf(page + len, PRINTK_HEADER
4266 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4267 "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4268 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4269 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4270 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4271 irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4272 req ? req->intrc : 0);
4273 len += sprintf(page + len, PRINTK_HEADER
4274 " device %s: Failing TCW: %p\n",
4275 dev_name(&device->cdev->dev),
4276 (void *) (addr_t) irb->scsw.tm.tcw);
4277
4278 tsb = NULL;
4279 sense = NULL;
4280 if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4281 tsb = tcw_get_tsb(
4282 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4283
4284 if (tsb) {
4285 len += sprintf(page + len, PRINTK_HEADER
4286 " tsb->length %d\n", tsb->length);
4287 len += sprintf(page + len, PRINTK_HEADER
4288 " tsb->flags %x\n", tsb->flags);
4289 len += sprintf(page + len, PRINTK_HEADER
4290 " tsb->dcw_offset %d\n", tsb->dcw_offset);
4291 len += sprintf(page + len, PRINTK_HEADER
4292 " tsb->count %d\n", tsb->count);
4293 residual = tsb->count - 28;
4294 len += sprintf(page + len, PRINTK_HEADER
4295 " residual %d\n", residual);
4296
4297 switch (tsb->flags & 0x07) {
4298 case 1: /* tsa_iostat */
4299 len += sprintf(page + len, PRINTK_HEADER
4300 " tsb->tsa.iostat.dev_time %d\n",
4301 tsb->tsa.iostat.dev_time);
4302 len += sprintf(page + len, PRINTK_HEADER
4303 " tsb->tsa.iostat.def_time %d\n",
4304 tsb->tsa.iostat.def_time);
4305 len += sprintf(page + len, PRINTK_HEADER
4306 " tsb->tsa.iostat.queue_time %d\n",
4307 tsb->tsa.iostat.queue_time);
4308 len += sprintf(page + len, PRINTK_HEADER
4309 " tsb->tsa.iostat.dev_busy_time %d\n",
4310 tsb->tsa.iostat.dev_busy_time);
4311 len += sprintf(page + len, PRINTK_HEADER
4312 " tsb->tsa.iostat.dev_act_time %d\n",
4313 tsb->tsa.iostat.dev_act_time);
4314 sense = tsb->tsa.iostat.sense;
4315 break;
4316 case 2: /* ts_ddpc */
4317 len += sprintf(page + len, PRINTK_HEADER
4318 " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4319 for (sl = 0; sl < 2; sl++) {
4320 len += sprintf(page + len, PRINTK_HEADER
4321 " tsb->tsa.ddpc.rcq %2d-%2d: ",
4322 (8 * sl), ((8 * sl) + 7));
4323 rcq = tsb->tsa.ddpc.rcq;
4324 for (sct = 0; sct < 8; sct++) {
4325 len += sprintf(page + len, " %02x",
4326 rcq[8 * sl + sct]);
4327 }
4328 len += sprintf(page + len, "\n");
4329 }
4330 sense = tsb->tsa.ddpc.sense;
4331 break;
4332 case 3: /* tsa_intrg */
4333 len += sprintf(page + len, PRINTK_HEADER
4334 " tsb->tsa.intrg.: not supportet yet\n");
4335 break;
4336 }
4337
4338 if (sense) {
4339 for (sl = 0; sl < 4; sl++) {
4340 len += sprintf(page + len, PRINTK_HEADER
4341 " Sense(hex) %2d-%2d:",
4342 (8 * sl), ((8 * sl) + 7));
4343 for (sct = 0; sct < 8; sct++) {
4344 len += sprintf(page + len, " %02x",
4345 sense[8 * sl + sct]);
4346 }
4347 len += sprintf(page + len, "\n");
4348 }
4349
4350 if (sense[27] & DASD_SENSE_BIT_0) {
4351 /* 24 Byte Sense Data */
4352 sprintf(page + len, PRINTK_HEADER
4353 " 24 Byte: %x MSG %x, "
4354 "%s MSGb to SYSOP\n",
4355 sense[7] >> 4, sense[7] & 0x0f,
4356 sense[1] & 0x10 ? "" : "no");
4357 } else {
4358 /* 32 Byte Sense Data */
4359 sprintf(page + len, PRINTK_HEADER
4360 " 32 Byte: Format: %x "
4361 "Exception class %x\n",
4362 sense[6] & 0x0f, sense[22] >> 4);
4363 }
4364 } else {
4365 sprintf(page + len, PRINTK_HEADER
4366 " SORRY - NO VALID SENSE AVAILABLE\n");
4367 }
4368 } else {
4369 sprintf(page + len, PRINTK_HEADER
4370 " SORRY - NO TSB DATA AVAILABLE\n");
4371 }
4372 printk(KERN_ERR "%s", page);
4373 free_page((unsigned long) page);
4374 }
4375
4376 static void dasd_eckd_dump_sense(struct dasd_device *device,
4377 struct dasd_ccw_req *req, struct irb *irb)
4378 {
4379 if (scsw_is_tm(&irb->scsw))
4380 dasd_eckd_dump_sense_tcw(device, req, irb);
4381 else
4382 dasd_eckd_dump_sense_ccw(device, req, irb);
4383 }
4384
4385 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4386 {
4387 /*
4388 * the device should be disconnected from our LCU structure
4389 * on restore we will reconnect it and reread LCU specific
4390 * information like PAV support that might have changed
4391 */
4392 dasd_alias_remove_device(device);
4393 dasd_alias_disconnect_device_from_lcu(device);
4394
4395 return 0;
4396 }
4397
4398 static int dasd_eckd_restore_device(struct dasd_device *device)
4399 {
4400 struct dasd_eckd_private *private;
4401 struct dasd_eckd_characteristics temp_rdc_data;
4402 int rc;
4403 struct dasd_uid temp_uid;
4404 unsigned long flags;
4405 unsigned long cqr_flags = 0;
4406
4407 private = (struct dasd_eckd_private *) device->private;
4408
4409 /* Read Configuration Data */
4410 dasd_eckd_read_conf(device);
4411
4412 dasd_eckd_get_uid(device, &temp_uid);
4413 /* Generate device unique id */
4414 rc = dasd_eckd_generate_uid(device);
4415 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4416 if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4417 dev_err(&device->cdev->dev, "The UID of the DASD has "
4418 "changed\n");
4419 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4420 if (rc)
4421 goto out_err;
4422
4423 /* register lcu with alias handling, enable PAV if this is a new lcu */
4424 rc = dasd_alias_make_device_known_to_lcu(device);
4425 if (rc)
4426 return rc;
4427
4428 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4429 dasd_eckd_validate_server(device, cqr_flags);
4430
4431 /* RE-Read Configuration Data */
4432 dasd_eckd_read_conf(device);
4433
4434 /* Read Feature Codes */
4435 dasd_eckd_read_features(device);
4436
4437 /* Read Device Characteristics */
4438 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4439 &temp_rdc_data, 64);
4440 if (rc) {
4441 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4442 "Read device characteristic failed, rc=%d", rc);
4443 goto out_err;
4444 }
4445 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4446 memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4447 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4448
4449 /* add device to alias management */
4450 dasd_alias_add_device(device);
4451
4452 return 0;
4453
4454 out_err:
4455 return -1;
4456 }
4457
4458 static int dasd_eckd_reload_device(struct dasd_device *device)
4459 {
4460 struct dasd_eckd_private *private;
4461 int rc, old_base;
4462 char print_uid[60];
4463 struct dasd_uid uid;
4464 unsigned long flags;
4465
4466 private = (struct dasd_eckd_private *) device->private;
4467
4468 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4469 old_base = private->uid.base_unit_addr;
4470 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4471
4472 /* Read Configuration Data */
4473 rc = dasd_eckd_read_conf(device);
4474 if (rc)
4475 goto out_err;
4476
4477 rc = dasd_eckd_generate_uid(device);
4478 if (rc)
4479 goto out_err;
4480 /*
4481 * update unit address configuration and
4482 * add device to alias management
4483 */
4484 dasd_alias_update_add_device(device);
4485
4486 dasd_eckd_get_uid(device, &uid);
4487
4488 if (old_base != uid.base_unit_addr) {
4489 if (strlen(uid.vduit) > 0)
4490 snprintf(print_uid, sizeof(print_uid),
4491 "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4492 uid.ssid, uid.base_unit_addr, uid.vduit);
4493 else
4494 snprintf(print_uid, sizeof(print_uid),
4495 "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4496 uid.ssid, uid.base_unit_addr);
4497
4498 dev_info(&device->cdev->dev,
4499 "An Alias device was reassigned to a new base device "
4500 "with UID: %s\n", print_uid);
4501 }
4502 return 0;
4503
4504 out_err:
4505 return -1;
4506 }
4507
4508 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
4509 struct dasd_rssd_messages *messages,
4510 __u8 lpum)
4511 {
4512 struct dasd_rssd_messages *message_buf;
4513 struct dasd_psf_prssd_data *prssdp;
4514 struct dasd_eckd_private *private;
4515 struct dasd_ccw_req *cqr;
4516 struct ccw1 *ccw;
4517 int rc;
4518
4519 private = (struct dasd_eckd_private *) device->private;
4520 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
4521 (sizeof(struct dasd_psf_prssd_data) +
4522 sizeof(struct dasd_rssd_messages)),
4523 device);
4524 if (IS_ERR(cqr)) {
4525 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
4526 "Could not allocate read message buffer request");
4527 return PTR_ERR(cqr);
4528 }
4529
4530 cqr->startdev = device;
4531 cqr->memdev = device;
4532 cqr->block = NULL;
4533 cqr->retries = 256;
4534 cqr->expires = 10 * HZ;
4535
4536 /* we need to check for messages on exactly this path */
4537 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
4538 cqr->lpm = lpum;
4539
4540 /* Prepare for Read Subsystem Data */
4541 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4542 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4543 prssdp->order = PSF_ORDER_PRSSD;
4544 prssdp->suborder = 0x03; /* Message Buffer */
4545 /* all other bytes of prssdp must be zero */
4546
4547 ccw = cqr->cpaddr;
4548 ccw->cmd_code = DASD_ECKD_CCW_PSF;
4549 ccw->count = sizeof(struct dasd_psf_prssd_data);
4550 ccw->flags |= CCW_FLAG_CC;
4551 ccw->flags |= CCW_FLAG_SLI;
4552 ccw->cda = (__u32)(addr_t) prssdp;
4553
4554 /* Read Subsystem Data - message buffer */
4555 message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
4556 memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
4557
4558 ccw++;
4559 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4560 ccw->count = sizeof(struct dasd_rssd_messages);
4561 ccw->flags |= CCW_FLAG_SLI;
4562 ccw->cda = (__u32)(addr_t) message_buf;
4563
4564 cqr->buildclk = get_tod_clock();
4565 cqr->status = DASD_CQR_FILLED;
4566 rc = dasd_sleep_on_immediatly(cqr);
4567 if (rc == 0) {
4568 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4569 message_buf = (struct dasd_rssd_messages *)
4570 (prssdp + 1);
4571 memcpy(messages, message_buf,
4572 sizeof(struct dasd_rssd_messages));
4573 } else
4574 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4575 "Reading messages failed with rc=%d\n"
4576 , rc);
4577 dasd_sfree_request(cqr, cqr->memdev);
4578 return rc;
4579 }
4580
4581 /*
4582 * Perform Subsystem Function - CUIR response
4583 */
4584 static int
4585 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
4586 __u32 message_id,
4587 struct channel_path_desc *desc,
4588 struct subchannel_id sch_id)
4589 {
4590 struct dasd_psf_cuir_response *psf_cuir;
4591 struct dasd_ccw_req *cqr;
4592 struct ccw1 *ccw;
4593 int rc;
4594
4595 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
4596 sizeof(struct dasd_psf_cuir_response),
4597 device);
4598
4599 if (IS_ERR(cqr)) {
4600 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4601 "Could not allocate PSF-CUIR request");
4602 return PTR_ERR(cqr);
4603 }
4604
4605 psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
4606 psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
4607 psf_cuir->cc = response;
4608 if (desc)
4609 psf_cuir->chpid = desc->chpid;
4610 psf_cuir->message_id = message_id;
4611 psf_cuir->cssid = sch_id.cssid;
4612 psf_cuir->ssid = sch_id.ssid;
4613
4614 ccw = cqr->cpaddr;
4615 ccw->cmd_code = DASD_ECKD_CCW_PSF;
4616 ccw->cda = (__u32)(addr_t)psf_cuir;
4617 ccw->count = sizeof(struct dasd_psf_cuir_response);
4618
4619 cqr->startdev = device;
4620 cqr->memdev = device;
4621 cqr->block = NULL;
4622 cqr->retries = 256;
4623 cqr->expires = 10*HZ;
4624 cqr->buildclk = get_tod_clock();
4625 cqr->status = DASD_CQR_FILLED;
4626
4627 rc = dasd_sleep_on(cqr);
4628
4629 dasd_sfree_request(cqr, cqr->memdev);
4630 return rc;
4631 }
4632
4633 static int dasd_eckd_cuir_change_state(struct dasd_device *device, __u8 lpum)
4634 {
4635 unsigned long flags;
4636 __u8 tbcpm;
4637
4638 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4639 tbcpm = device->path_data.opm & ~lpum;
4640 if (tbcpm) {
4641 device->path_data.opm = tbcpm;
4642 device->path_data.cuirpm |= lpum;
4643 }
4644 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4645 return tbcpm ? 0 : PSF_CUIR_LAST_PATH;
4646 }
4647
4648 /*
4649 * walk through all devices and quiesce them
4650 * if it is the last path return error
4651 *
4652 * if only part of the devices are quiesced and an error
4653 * occurs no onlining necessary, the storage server will
4654 * notify the already set offline devices again
4655 */
4656 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
4657 struct channel_path_desc *desc,
4658 struct subchannel_id sch_id)
4659 {
4660 struct alias_pav_group *pavgroup, *tempgroup;
4661 struct dasd_eckd_private *private;
4662 struct dasd_device *dev, *n;
4663 int rc;
4664
4665 private = (struct dasd_eckd_private *) device->private;
4666 rc = 0;
4667
4668 /* active devices */
4669 list_for_each_entry_safe(dev, n,
4670 &private->lcu->active_devices,
4671 alias_list) {
4672 rc = dasd_eckd_cuir_change_state(dev, lpum);
4673 if (rc)
4674 goto out;
4675 }
4676
4677 /* inactive devices */
4678 list_for_each_entry_safe(dev, n,
4679 &private->lcu->inactive_devices,
4680 alias_list) {
4681 rc = dasd_eckd_cuir_change_state(dev, lpum);
4682 if (rc)
4683 goto out;
4684 }
4685
4686 /* devices in PAV groups */
4687 list_for_each_entry_safe(pavgroup, tempgroup,
4688 &private->lcu->grouplist, group) {
4689 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
4690 alias_list) {
4691 rc = dasd_eckd_cuir_change_state(dev, lpum);
4692 if (rc)
4693 goto out;
4694 }
4695 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
4696 alias_list) {
4697 rc = dasd_eckd_cuir_change_state(dev, lpum);
4698 if (rc)
4699 goto out;
4700 }
4701 }
4702
4703 pr_warn("Service on the storage server caused path %x.%02x to go offline",
4704 sch_id.cssid, desc ? desc->chpid : 0);
4705 rc = PSF_CUIR_COMPLETED;
4706 out:
4707 return rc;
4708 }
4709
4710 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
4711 struct channel_path_desc *desc,
4712 struct subchannel_id sch_id)
4713 {
4714 struct alias_pav_group *pavgroup, *tempgroup;
4715 struct dasd_eckd_private *private;
4716 struct dasd_device *dev, *n;
4717
4718 pr_info("Path %x.%02x is back online after service on the storage server",
4719 sch_id.cssid, desc ? desc->chpid : 0);
4720 private = (struct dasd_eckd_private *) device->private;
4721
4722 /*
4723 * the path may have been added through a generic path event before
4724 * only trigger path verification if the path is not already in use
4725 */
4726
4727 list_for_each_entry_safe(dev, n,
4728 &private->lcu->active_devices,
4729 alias_list) {
4730 if (!(dev->path_data.opm & lpum)) {
4731 dev->path_data.tbvpm |= lpum;
4732 dasd_schedule_device_bh(dev);
4733 }
4734 }
4735
4736 list_for_each_entry_safe(dev, n,
4737 &private->lcu->inactive_devices,
4738 alias_list) {
4739 if (!(dev->path_data.opm & lpum)) {
4740 dev->path_data.tbvpm |= lpum;
4741 dasd_schedule_device_bh(dev);
4742 }
4743 }
4744
4745 /* devices in PAV groups */
4746 list_for_each_entry_safe(pavgroup, tempgroup,
4747 &private->lcu->grouplist,
4748 group) {
4749 list_for_each_entry_safe(dev, n,
4750 &pavgroup->baselist,
4751 alias_list) {
4752 if (!(dev->path_data.opm & lpum)) {
4753 dev->path_data.tbvpm |= lpum;
4754 dasd_schedule_device_bh(dev);
4755 }
4756 }
4757 list_for_each_entry_safe(dev, n,
4758 &pavgroup->aliaslist,
4759 alias_list) {
4760 if (!(dev->path_data.opm & lpum)) {
4761 dev->path_data.tbvpm |= lpum;
4762 dasd_schedule_device_bh(dev);
4763 }
4764 }
4765 }
4766 return PSF_CUIR_COMPLETED;
4767 }
4768
4769 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
4770 __u8 lpum)
4771 {
4772 struct dasd_cuir_message *cuir = messages;
4773 struct channel_path_desc *desc;
4774 struct subchannel_id sch_id;
4775 int pos, response;
4776 ccw_device_get_schid(device->cdev, &sch_id);
4777
4778 /* get position of path in mask */
4779 pos = 8 - ffs(lpum);
4780 /* get channel path descriptor from this position */
4781 desc = ccw_device_get_chp_desc(device->cdev, pos);
4782
4783 if (cuir->code == CUIR_QUIESCE) {
4784 /* quiesce */
4785 response = dasd_eckd_cuir_quiesce(device, lpum, desc, sch_id);
4786 } else if (cuir->code == CUIR_RESUME) {
4787 /* resume */
4788 response = dasd_eckd_cuir_resume(device, lpum, desc, sch_id);
4789 } else
4790 response = PSF_CUIR_NOT_SUPPORTED;
4791
4792 dasd_eckd_psf_cuir_response(device, response, cuir->message_id,
4793 desc, sch_id);
4794
4795 /* free descriptor copy */
4796 kfree(desc);
4797 }
4798
4799 static void dasd_eckd_check_attention_work(struct work_struct *work)
4800 {
4801 struct check_attention_work_data *data;
4802 struct dasd_rssd_messages *messages;
4803 struct dasd_device *device;
4804 int rc;
4805
4806 data = container_of(work, struct check_attention_work_data, worker);
4807 device = data->device;
4808
4809 messages = kzalloc(sizeof(*messages), GFP_KERNEL);
4810 if (!messages) {
4811 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4812 "Could not allocate attention message buffer");
4813 goto out;
4814 }
4815
4816 rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
4817 if (rc)
4818 goto out;
4819
4820 if (messages->length == ATTENTION_LENGTH_CUIR &&
4821 messages->format == ATTENTION_FORMAT_CUIR)
4822 dasd_eckd_handle_cuir(device, messages, data->lpum);
4823
4824 out:
4825 dasd_put_device(device);
4826 kfree(messages);
4827 kfree(data);
4828 }
4829
4830 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
4831 {
4832 struct check_attention_work_data *data;
4833
4834 data = kzalloc(sizeof(*data), GFP_ATOMIC);
4835 if (!data)
4836 return -ENOMEM;
4837 INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
4838 dasd_get_device(device);
4839 data->device = device;
4840 data->lpum = lpum;
4841 schedule_work(&data->worker);
4842 return 0;
4843 }
4844
4845 static struct ccw_driver dasd_eckd_driver = {
4846 .driver = {
4847 .name = "dasd-eckd",
4848 .owner = THIS_MODULE,
4849 },
4850 .ids = dasd_eckd_ids,
4851 .probe = dasd_eckd_probe,
4852 .remove = dasd_generic_remove,
4853 .set_offline = dasd_generic_set_offline,
4854 .set_online = dasd_eckd_set_online,
4855 .notify = dasd_generic_notify,
4856 .path_event = dasd_generic_path_event,
4857 .shutdown = dasd_generic_shutdown,
4858 .freeze = dasd_generic_pm_freeze,
4859 .thaw = dasd_generic_restore_device,
4860 .restore = dasd_generic_restore_device,
4861 .uc_handler = dasd_generic_uc_handler,
4862 .int_class = IRQIO_DAS,
4863 };
4864
4865 /*
4866 * max_blocks is dependent on the amount of storage that is available
4867 * in the static io buffer for each device. Currently each device has
4868 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4869 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4870 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4871 * addition we have one define extent ccw + 16 bytes of data and one
4872 * locate record ccw + 16 bytes of data. That makes:
4873 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4874 * We want to fit two into the available memory so that we can immediately
4875 * start the next request if one finishes off. That makes 249.5 blocks
4876 * for one request. Give a little safety and the result is 240.
4877 */
4878 static struct dasd_discipline dasd_eckd_discipline = {
4879 .owner = THIS_MODULE,
4880 .name = "ECKD",
4881 .ebcname = "ECKD",
4882 .max_blocks = 190,
4883 .check_device = dasd_eckd_check_characteristics,
4884 .uncheck_device = dasd_eckd_uncheck_device,
4885 .do_analysis = dasd_eckd_do_analysis,
4886 .verify_path = dasd_eckd_verify_path,
4887 .basic_to_ready = dasd_eckd_basic_to_ready,
4888 .online_to_ready = dasd_eckd_online_to_ready,
4889 .basic_to_known = dasd_eckd_basic_to_known,
4890 .fill_geometry = dasd_eckd_fill_geometry,
4891 .start_IO = dasd_start_IO,
4892 .term_IO = dasd_term_IO,
4893 .handle_terminated_request = dasd_eckd_handle_terminated_request,
4894 .format_device = dasd_eckd_format_device,
4895 .erp_action = dasd_eckd_erp_action,
4896 .erp_postaction = dasd_eckd_erp_postaction,
4897 .check_for_device_change = dasd_eckd_check_for_device_change,
4898 .build_cp = dasd_eckd_build_alias_cp,
4899 .free_cp = dasd_eckd_free_alias_cp,
4900 .dump_sense = dasd_eckd_dump_sense,
4901 .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4902 .fill_info = dasd_eckd_fill_info,
4903 .ioctl = dasd_eckd_ioctl,
4904 .freeze = dasd_eckd_pm_freeze,
4905 .restore = dasd_eckd_restore_device,
4906 .reload = dasd_eckd_reload_device,
4907 .get_uid = dasd_eckd_get_uid,
4908 .kick_validate = dasd_eckd_kick_validate_server,
4909 .check_attention = dasd_eckd_check_attention,
4910 };
4911
4912 static int __init
4913 dasd_eckd_init(void)
4914 {
4915 int ret;
4916
4917 ASCEBC(dasd_eckd_discipline.ebcname, 4);
4918 dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4919 GFP_KERNEL | GFP_DMA);
4920 if (!dasd_reserve_req)
4921 return -ENOMEM;
4922 path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4923 GFP_KERNEL | GFP_DMA);
4924 if (!path_verification_worker) {
4925 kfree(dasd_reserve_req);
4926 return -ENOMEM;
4927 }
4928 rawpadpage = (void *)__get_free_page(GFP_KERNEL);
4929 if (!rawpadpage) {
4930 kfree(path_verification_worker);
4931 kfree(dasd_reserve_req);
4932 return -ENOMEM;
4933 }
4934 ret = ccw_driver_register(&dasd_eckd_driver);
4935 if (!ret)
4936 wait_for_device_probe();
4937 else {
4938 kfree(path_verification_worker);
4939 kfree(dasd_reserve_req);
4940 free_page((unsigned long)rawpadpage);
4941 }
4942 return ret;
4943 }
4944
4945 static void __exit
4946 dasd_eckd_cleanup(void)
4947 {
4948 ccw_driver_unregister(&dasd_eckd_driver);
4949 kfree(path_verification_worker);
4950 kfree(dasd_reserve_req);
4951 free_page((unsigned long)rawpadpage);
4952 }
4953
4954 module_init(dasd_eckd_init);
4955 module_exit(dasd_eckd_cleanup);
Linux with added FPC-III support