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Use dentry_path() to create full path to inode object
[pohmelfs.git] / drivers / s390 / block / dasd_eckd.c
blob2617b1ed4709bffd1f68971ebe27ea2e61e8f62f
1 /*
2 * File...........: linux/drivers/s390/block/dasd_eckd.c
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Horst Hummel <Horst.Hummel@de.ibm.com>
5 * Carsten Otte <Cotte@de.ibm.com>
6 * Martin Schwidefsky <schwidefsky@de.ibm.com>
7 * Bugreports.to..: <Linux390@de.ibm.com>
8 * Copyright IBM Corp. 1999, 2009
9 * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
10 * Author.........: Nigel Hislop <hislop_nigel@emc.com>
11 */
12
13 #define KMSG_COMPONENT "dasd-eckd"
14
15 #include <linux/stddef.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/hdreg.h> /* HDIO_GETGEO */
19 #include <linux/bio.h>
20 #include <linux/module.h>
21 #include <linux/compat.h>
22 #include <linux/init.h>
23
24 #include <asm/debug.h>
25 #include <asm/idals.h>
26 #include <asm/ebcdic.h>
27 #include <asm/io.h>
28 #include <asm/uaccess.h>
29 #include <asm/cio.h>
30 #include <asm/ccwdev.h>
31 #include <asm/itcw.h>
32
33 #include "dasd_int.h"
34 #include "dasd_eckd.h"
35 #include "../cio/chsc.h"
36
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 #define INIT_CQR_OK 0
91 #define INIT_CQR_UNFORMATTED 1
92 #define INIT_CQR_ERROR 2
93
94 /* emergency request for reserve/release */
95 static struct {
96 struct dasd_ccw_req cqr;
97 struct ccw1 ccw;
98 char data[32];
99 } *dasd_reserve_req;
100 static DEFINE_MUTEX(dasd_reserve_mutex);
101
102 /* definitions for the path verification worker */
103 struct path_verification_work_data {
104 struct work_struct worker;
105 struct dasd_device *device;
106 struct dasd_ccw_req cqr;
107 struct ccw1 ccw;
108 __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
109 int isglobal;
110 __u8 tbvpm;
111 };
112 static struct path_verification_work_data *path_verification_worker;
113 static DEFINE_MUTEX(dasd_path_verification_mutex);
114
115 /* initial attempt at a probe function. this can be simplified once
116 * the other detection code is gone */
117 static int
118 dasd_eckd_probe (struct ccw_device *cdev)
119 {
120 int ret;
121
122 /* set ECKD specific ccw-device options */
123 ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
124 CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
125 if (ret) {
126 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
127 "dasd_eckd_probe: could not set "
128 "ccw-device options");
129 return ret;
130 }
131 ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
132 return ret;
133 }
134
135 static int
136 dasd_eckd_set_online(struct ccw_device *cdev)
137 {
138 return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
139 }
140
141 static const int sizes_trk0[] = { 28, 148, 84 };
142 #define LABEL_SIZE 140
143
144 static inline unsigned int
145 round_up_multiple(unsigned int no, unsigned int mult)
146 {
147 int rem = no % mult;
148 return (rem ? no - rem + mult : no);
149 }
150
151 static inline unsigned int
152 ceil_quot(unsigned int d1, unsigned int d2)
153 {
154 return (d1 + (d2 - 1)) / d2;
155 }
156
157 static unsigned int
158 recs_per_track(struct dasd_eckd_characteristics * rdc,
159 unsigned int kl, unsigned int dl)
160 {
161 int dn, kn;
162
163 switch (rdc->dev_type) {
164 case 0x3380:
165 if (kl)
166 return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
167 ceil_quot(dl + 12, 32));
168 else
169 return 1499 / (15 + ceil_quot(dl + 12, 32));
170 case 0x3390:
171 dn = ceil_quot(dl + 6, 232) + 1;
172 if (kl) {
173 kn = ceil_quot(kl + 6, 232) + 1;
174 return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
175 9 + ceil_quot(dl + 6 * dn, 34));
176 } else
177 return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
178 case 0x9345:
179 dn = ceil_quot(dl + 6, 232) + 1;
180 if (kl) {
181 kn = ceil_quot(kl + 6, 232) + 1;
182 return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
183 ceil_quot(dl + 6 * dn, 34));
184 } else
185 return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
186 }
187 return 0;
188 }
189
190 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
191 {
192 geo->cyl = (__u16) cyl;
193 geo->head = cyl >> 16;
194 geo->head <<= 4;
195 geo->head |= head;
196 }
197
198 static int
199 check_XRC (struct ccw1 *de_ccw,
200 struct DE_eckd_data *data,
201 struct dasd_device *device)
202 {
203 struct dasd_eckd_private *private;
204 int rc;
205
206 private = (struct dasd_eckd_private *) device->private;
207 if (!private->rdc_data.facilities.XRC_supported)
208 return 0;
209
210 /* switch on System Time Stamp - needed for XRC Support */
211 data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid' */
212 data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
213
214 rc = get_sync_clock(&data->ep_sys_time);
215 /* Ignore return code if sync clock is switched off. */
216 if (rc == -ENOSYS || rc == -EACCES)
217 rc = 0;
218
219 de_ccw->count = sizeof(struct DE_eckd_data);
220 de_ccw->flags |= CCW_FLAG_SLI;
221 return rc;
222 }
223
224 static int
225 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
226 unsigned int totrk, int cmd, struct dasd_device *device)
227 {
228 struct dasd_eckd_private *private;
229 u32 begcyl, endcyl;
230 u16 heads, beghead, endhead;
231 int rc = 0;
232
233 private = (struct dasd_eckd_private *) device->private;
234
235 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
236 ccw->flags = 0;
237 ccw->count = 16;
238 ccw->cda = (__u32) __pa(data);
239
240 memset(data, 0, sizeof(struct DE_eckd_data));
241 switch (cmd) {
242 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
243 case DASD_ECKD_CCW_READ_RECORD_ZERO:
244 case DASD_ECKD_CCW_READ:
245 case DASD_ECKD_CCW_READ_MT:
246 case DASD_ECKD_CCW_READ_CKD:
247 case DASD_ECKD_CCW_READ_CKD_MT:
248 case DASD_ECKD_CCW_READ_KD:
249 case DASD_ECKD_CCW_READ_KD_MT:
250 case DASD_ECKD_CCW_READ_COUNT:
251 data->mask.perm = 0x1;
252 data->attributes.operation = private->attrib.operation;
253 break;
254 case DASD_ECKD_CCW_WRITE:
255 case DASD_ECKD_CCW_WRITE_MT:
256 case DASD_ECKD_CCW_WRITE_KD:
257 case DASD_ECKD_CCW_WRITE_KD_MT:
258 data->mask.perm = 0x02;
259 data->attributes.operation = private->attrib.operation;
260 rc = check_XRC (ccw, data, device);
261 break;
262 case DASD_ECKD_CCW_WRITE_CKD:
263 case DASD_ECKD_CCW_WRITE_CKD_MT:
264 data->attributes.operation = DASD_BYPASS_CACHE;
265 rc = check_XRC (ccw, data, device);
266 break;
267 case DASD_ECKD_CCW_ERASE:
268 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
269 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
270 data->mask.perm = 0x3;
271 data->mask.auth = 0x1;
272 data->attributes.operation = DASD_BYPASS_CACHE;
273 rc = check_XRC (ccw, data, device);
274 break;
275 default:
276 dev_err(&device->cdev->dev,
277 "0x%x is not a known command\n", cmd);
278 break;
279 }
280
281 data->attributes.mode = 0x3; /* ECKD */
282
283 if ((private->rdc_data.cu_type == 0x2105 ||
284 private->rdc_data.cu_type == 0x2107 ||
285 private->rdc_data.cu_type == 0x1750)
286 && !(private->uses_cdl && trk < 2))
287 data->ga_extended |= 0x40; /* Regular Data Format Mode */
288
289 heads = private->rdc_data.trk_per_cyl;
290 begcyl = trk / heads;
291 beghead = trk % heads;
292 endcyl = totrk / heads;
293 endhead = totrk % heads;
294
295 /* check for sequential prestage - enhance cylinder range */
296 if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
297 data->attributes.operation == DASD_SEQ_ACCESS) {
298
299 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
300 endcyl += private->attrib.nr_cyl;
301 else
302 endcyl = (private->real_cyl - 1);
303 }
304
305 set_ch_t(&data->beg_ext, begcyl, beghead);
306 set_ch_t(&data->end_ext, endcyl, endhead);
307 return rc;
308 }
309
310 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
311 struct dasd_device *device)
312 {
313 struct dasd_eckd_private *private;
314 int rc;
315
316 private = (struct dasd_eckd_private *) device->private;
317 if (!private->rdc_data.facilities.XRC_supported)
318 return 0;
319
320 /* switch on System Time Stamp - needed for XRC Support */
321 pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid' */
322 pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
323 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid' */
324
325 rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
326 /* Ignore return code if sync clock is switched off. */
327 if (rc == -ENOSYS || rc == -EACCES)
328 rc = 0;
329 return rc;
330 }
331
332 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
333 unsigned int rec_on_trk, int count, int cmd,
334 struct dasd_device *device, unsigned int reclen,
335 unsigned int tlf)
336 {
337 struct dasd_eckd_private *private;
338 int sector;
339 int dn, d;
340
341 private = (struct dasd_eckd_private *) device->private;
342
343 memset(data, 0, sizeof(*data));
344 sector = 0;
345 if (rec_on_trk) {
346 switch (private->rdc_data.dev_type) {
347 case 0x3390:
348 dn = ceil_quot(reclen + 6, 232);
349 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
350 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
351 break;
352 case 0x3380:
353 d = 7 + ceil_quot(reclen + 12, 32);
354 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
355 break;
356 }
357 }
358 data->sector = sector;
359 /* note: meaning of count depends on the operation
360 * for record based I/O it's the number of records, but for
361 * track based I/O it's the number of tracks
362 */
363 data->count = count;
364 switch (cmd) {
365 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
366 data->operation.orientation = 0x3;
367 data->operation.operation = 0x03;
368 break;
369 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
370 data->operation.orientation = 0x3;
371 data->operation.operation = 0x16;
372 break;
373 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
374 data->operation.orientation = 0x1;
375 data->operation.operation = 0x03;
376 data->count++;
377 break;
378 case DASD_ECKD_CCW_READ_RECORD_ZERO:
379 data->operation.orientation = 0x3;
380 data->operation.operation = 0x16;
381 data->count++;
382 break;
383 case DASD_ECKD_CCW_WRITE:
384 case DASD_ECKD_CCW_WRITE_MT:
385 case DASD_ECKD_CCW_WRITE_KD:
386 case DASD_ECKD_CCW_WRITE_KD_MT:
387 data->auxiliary.length_valid = 0x1;
388 data->length = reclen;
389 data->operation.operation = 0x01;
390 break;
391 case DASD_ECKD_CCW_WRITE_CKD:
392 case DASD_ECKD_CCW_WRITE_CKD_MT:
393 data->auxiliary.length_valid = 0x1;
394 data->length = reclen;
395 data->operation.operation = 0x03;
396 break;
397 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
398 data->operation.orientation = 0x0;
399 data->operation.operation = 0x3F;
400 data->extended_operation = 0x11;
401 data->length = 0;
402 data->extended_parameter_length = 0x02;
403 if (data->count > 8) {
404 data->extended_parameter[0] = 0xFF;
405 data->extended_parameter[1] = 0xFF;
406 data->extended_parameter[1] <<= (16 - count);
407 } else {
408 data->extended_parameter[0] = 0xFF;
409 data->extended_parameter[0] <<= (8 - count);
410 data->extended_parameter[1] = 0x00;
411 }
412 data->sector = 0xFF;
413 break;
414 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
415 data->auxiliary.length_valid = 0x1;
416 data->length = reclen; /* not tlf, as one might think */
417 data->operation.operation = 0x3F;
418 data->extended_operation = 0x23;
419 break;
420 case DASD_ECKD_CCW_READ:
421 case DASD_ECKD_CCW_READ_MT:
422 case DASD_ECKD_CCW_READ_KD:
423 case DASD_ECKD_CCW_READ_KD_MT:
424 data->auxiliary.length_valid = 0x1;
425 data->length = reclen;
426 data->operation.operation = 0x06;
427 break;
428 case DASD_ECKD_CCW_READ_CKD:
429 case DASD_ECKD_CCW_READ_CKD_MT:
430 data->auxiliary.length_valid = 0x1;
431 data->length = reclen;
432 data->operation.operation = 0x16;
433 break;
434 case DASD_ECKD_CCW_READ_COUNT:
435 data->operation.operation = 0x06;
436 break;
437 case DASD_ECKD_CCW_READ_TRACK:
438 data->operation.orientation = 0x1;
439 data->operation.operation = 0x0C;
440 data->extended_parameter_length = 0;
441 data->sector = 0xFF;
442 break;
443 case DASD_ECKD_CCW_READ_TRACK_DATA:
444 data->auxiliary.length_valid = 0x1;
445 data->length = tlf;
446 data->operation.operation = 0x0C;
447 break;
448 case DASD_ECKD_CCW_ERASE:
449 data->length = reclen;
450 data->auxiliary.length_valid = 0x1;
451 data->operation.operation = 0x0b;
452 break;
453 default:
454 DBF_DEV_EVENT(DBF_ERR, device,
455 "fill LRE unknown opcode 0x%x", cmd);
456 BUG();
457 }
458 set_ch_t(&data->seek_addr,
459 trk / private->rdc_data.trk_per_cyl,
460 trk % private->rdc_data.trk_per_cyl);
461 data->search_arg.cyl = data->seek_addr.cyl;
462 data->search_arg.head = data->seek_addr.head;
463 data->search_arg.record = rec_on_trk;
464 }
465
466 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
467 unsigned int trk, unsigned int totrk, int cmd,
468 struct dasd_device *basedev, struct dasd_device *startdev,
469 unsigned char format, unsigned int rec_on_trk, int count,
470 unsigned int blksize, unsigned int tlf)
471 {
472 struct dasd_eckd_private *basepriv, *startpriv;
473 struct DE_eckd_data *dedata;
474 struct LRE_eckd_data *lredata;
475 u32 begcyl, endcyl;
476 u16 heads, beghead, endhead;
477 int rc = 0;
478
479 basepriv = (struct dasd_eckd_private *) basedev->private;
480 startpriv = (struct dasd_eckd_private *) startdev->private;
481 dedata = &pfxdata->define_extent;
482 lredata = &pfxdata->locate_record;
483
484 ccw->cmd_code = DASD_ECKD_CCW_PFX;
485 ccw->flags = 0;
486 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
487 ccw->count = sizeof(*pfxdata) + 2;
488 ccw->cda = (__u32) __pa(pfxdata);
489 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
490 } else {
491 ccw->count = sizeof(*pfxdata);
492 ccw->cda = (__u32) __pa(pfxdata);
493 memset(pfxdata, 0, sizeof(*pfxdata));
494 }
495
496 /* prefix data */
497 if (format > 1) {
498 DBF_DEV_EVENT(DBF_ERR, basedev,
499 "PFX LRE unknown format 0x%x", format);
500 BUG();
501 return -EINVAL;
502 }
503 pfxdata->format = format;
504 pfxdata->base_address = basepriv->ned->unit_addr;
505 pfxdata->base_lss = basepriv->ned->ID;
506 pfxdata->validity.define_extent = 1;
507
508 /* private uid is kept up to date, conf_data may be outdated */
509 if (startpriv->uid.type != UA_BASE_DEVICE) {
510 pfxdata->validity.verify_base = 1;
511 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
512 pfxdata->validity.hyper_pav = 1;
513 }
514
515 /* define extend data (mostly)*/
516 switch (cmd) {
517 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
518 case DASD_ECKD_CCW_READ_RECORD_ZERO:
519 case DASD_ECKD_CCW_READ:
520 case DASD_ECKD_CCW_READ_MT:
521 case DASD_ECKD_CCW_READ_CKD:
522 case DASD_ECKD_CCW_READ_CKD_MT:
523 case DASD_ECKD_CCW_READ_KD:
524 case DASD_ECKD_CCW_READ_KD_MT:
525 case DASD_ECKD_CCW_READ_COUNT:
526 dedata->mask.perm = 0x1;
527 dedata->attributes.operation = basepriv->attrib.operation;
528 break;
529 case DASD_ECKD_CCW_READ_TRACK:
530 case DASD_ECKD_CCW_READ_TRACK_DATA:
531 dedata->mask.perm = 0x1;
532 dedata->attributes.operation = basepriv->attrib.operation;
533 dedata->blk_size = 0;
534 break;
535 case DASD_ECKD_CCW_WRITE:
536 case DASD_ECKD_CCW_WRITE_MT:
537 case DASD_ECKD_CCW_WRITE_KD:
538 case DASD_ECKD_CCW_WRITE_KD_MT:
539 dedata->mask.perm = 0x02;
540 dedata->attributes.operation = basepriv->attrib.operation;
541 rc = check_XRC_on_prefix(pfxdata, basedev);
542 break;
543 case DASD_ECKD_CCW_WRITE_CKD:
544 case DASD_ECKD_CCW_WRITE_CKD_MT:
545 dedata->attributes.operation = DASD_BYPASS_CACHE;
546 rc = check_XRC_on_prefix(pfxdata, basedev);
547 break;
548 case DASD_ECKD_CCW_ERASE:
549 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
550 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
551 dedata->mask.perm = 0x3;
552 dedata->mask.auth = 0x1;
553 dedata->attributes.operation = DASD_BYPASS_CACHE;
554 rc = check_XRC_on_prefix(pfxdata, basedev);
555 break;
556 case DASD_ECKD_CCW_WRITE_FULL_TRACK:
557 dedata->mask.perm = 0x03;
558 dedata->attributes.operation = basepriv->attrib.operation;
559 dedata->blk_size = 0;
560 break;
561 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
562 dedata->mask.perm = 0x02;
563 dedata->attributes.operation = basepriv->attrib.operation;
564 dedata->blk_size = blksize;
565 rc = check_XRC_on_prefix(pfxdata, basedev);
566 break;
567 default:
568 DBF_DEV_EVENT(DBF_ERR, basedev,
569 "PFX LRE unknown opcode 0x%x", cmd);
570 BUG();
571 return -EINVAL;
572 }
573
574 dedata->attributes.mode = 0x3; /* ECKD */
575
576 if ((basepriv->rdc_data.cu_type == 0x2105 ||
577 basepriv->rdc_data.cu_type == 0x2107 ||
578 basepriv->rdc_data.cu_type == 0x1750)
579 && !(basepriv->uses_cdl && trk < 2))
580 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
581
582 heads = basepriv->rdc_data.trk_per_cyl;
583 begcyl = trk / heads;
584 beghead = trk % heads;
585 endcyl = totrk / heads;
586 endhead = totrk % heads;
587
588 /* check for sequential prestage - enhance cylinder range */
589 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
590 dedata->attributes.operation == DASD_SEQ_ACCESS) {
591
592 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
593 endcyl += basepriv->attrib.nr_cyl;
594 else
595 endcyl = (basepriv->real_cyl - 1);
596 }
597
598 set_ch_t(&dedata->beg_ext, begcyl, beghead);
599 set_ch_t(&dedata->end_ext, endcyl, endhead);
600
601 if (format == 1) {
602 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
603 basedev, blksize, tlf);
604 }
605
606 return rc;
607 }
608
609 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
610 unsigned int trk, unsigned int totrk, int cmd,
611 struct dasd_device *basedev, struct dasd_device *startdev)
612 {
613 return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
614 0, 0, 0, 0, 0);
615 }
616
617 static void
618 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
619 unsigned int rec_on_trk, int no_rec, int cmd,
620 struct dasd_device * device, int reclen)
621 {
622 struct dasd_eckd_private *private;
623 int sector;
624 int dn, d;
625
626 private = (struct dasd_eckd_private *) device->private;
627
628 DBF_DEV_EVENT(DBF_INFO, device,
629 "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
630 trk, rec_on_trk, no_rec, cmd, reclen);
631
632 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
633 ccw->flags = 0;
634 ccw->count = 16;
635 ccw->cda = (__u32) __pa(data);
636
637 memset(data, 0, sizeof(struct LO_eckd_data));
638 sector = 0;
639 if (rec_on_trk) {
640 switch (private->rdc_data.dev_type) {
641 case 0x3390:
642 dn = ceil_quot(reclen + 6, 232);
643 d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
644 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
645 break;
646 case 0x3380:
647 d = 7 + ceil_quot(reclen + 12, 32);
648 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
649 break;
650 }
651 }
652 data->sector = sector;
653 data->count = no_rec;
654 switch (cmd) {
655 case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
656 data->operation.orientation = 0x3;
657 data->operation.operation = 0x03;
658 break;
659 case DASD_ECKD_CCW_READ_HOME_ADDRESS:
660 data->operation.orientation = 0x3;
661 data->operation.operation = 0x16;
662 break;
663 case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
664 data->operation.orientation = 0x1;
665 data->operation.operation = 0x03;
666 data->count++;
667 break;
668 case DASD_ECKD_CCW_READ_RECORD_ZERO:
669 data->operation.orientation = 0x3;
670 data->operation.operation = 0x16;
671 data->count++;
672 break;
673 case DASD_ECKD_CCW_WRITE:
674 case DASD_ECKD_CCW_WRITE_MT:
675 case DASD_ECKD_CCW_WRITE_KD:
676 case DASD_ECKD_CCW_WRITE_KD_MT:
677 data->auxiliary.last_bytes_used = 0x1;
678 data->length = reclen;
679 data->operation.operation = 0x01;
680 break;
681 case DASD_ECKD_CCW_WRITE_CKD:
682 case DASD_ECKD_CCW_WRITE_CKD_MT:
683 data->auxiliary.last_bytes_used = 0x1;
684 data->length = reclen;
685 data->operation.operation = 0x03;
686 break;
687 case DASD_ECKD_CCW_READ:
688 case DASD_ECKD_CCW_READ_MT:
689 case DASD_ECKD_CCW_READ_KD:
690 case DASD_ECKD_CCW_READ_KD_MT:
691 data->auxiliary.last_bytes_used = 0x1;
692 data->length = reclen;
693 data->operation.operation = 0x06;
694 break;
695 case DASD_ECKD_CCW_READ_CKD:
696 case DASD_ECKD_CCW_READ_CKD_MT:
697 data->auxiliary.last_bytes_used = 0x1;
698 data->length = reclen;
699 data->operation.operation = 0x16;
700 break;
701 case DASD_ECKD_CCW_READ_COUNT:
702 data->operation.operation = 0x06;
703 break;
704 case DASD_ECKD_CCW_ERASE:
705 data->length = reclen;
706 data->auxiliary.last_bytes_used = 0x1;
707 data->operation.operation = 0x0b;
708 break;
709 default:
710 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
711 "opcode 0x%x", cmd);
712 }
713 set_ch_t(&data->seek_addr,
714 trk / private->rdc_data.trk_per_cyl,
715 trk % private->rdc_data.trk_per_cyl);
716 data->search_arg.cyl = data->seek_addr.cyl;
717 data->search_arg.head = data->seek_addr.head;
718 data->search_arg.record = rec_on_trk;
719 }
720
721 /*
722 * Returns 1 if the block is one of the special blocks that needs
723 * to get read/written with the KD variant of the command.
724 * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
725 * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
726 * Luckily the KD variants differ only by one bit (0x08) from the
727 * normal variant. So don't wonder about code like:
728 * if (dasd_eckd_cdl_special(blk_per_trk, recid))
729 * ccw->cmd_code |= 0x8;
730 */
731 static inline int
732 dasd_eckd_cdl_special(int blk_per_trk, int recid)
733 {
734 if (recid < 3)
735 return 1;
736 if (recid < blk_per_trk)
737 return 0;
738 if (recid < 2 * blk_per_trk)
739 return 1;
740 return 0;
741 }
742
743 /*
744 * Returns the record size for the special blocks of the cdl format.
745 * Only returns something useful if dasd_eckd_cdl_special is true
746 * for the recid.
747 */
748 static inline int
749 dasd_eckd_cdl_reclen(int recid)
750 {
751 if (recid < 3)
752 return sizes_trk0[recid];
753 return LABEL_SIZE;
754 }
755 /* create unique id from private structure. */
756 static void create_uid(struct dasd_eckd_private *private)
757 {
758 int count;
759 struct dasd_uid *uid;
760
761 uid = &private->uid;
762 memset(uid, 0, sizeof(struct dasd_uid));
763 memcpy(uid->vendor, private->ned->HDA_manufacturer,
764 sizeof(uid->vendor) - 1);
765 EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
766 memcpy(uid->serial, private->ned->HDA_location,
767 sizeof(uid->serial) - 1);
768 EBCASC(uid->serial, sizeof(uid->serial) - 1);
769 uid->ssid = private->gneq->subsystemID;
770 uid->real_unit_addr = private->ned->unit_addr;
771 if (private->sneq) {
772 uid->type = private->sneq->sua_flags;
773 if (uid->type == UA_BASE_PAV_ALIAS)
774 uid->base_unit_addr = private->sneq->base_unit_addr;
775 } else {
776 uid->type = UA_BASE_DEVICE;
777 }
778 if (private->vdsneq) {
779 for (count = 0; count < 16; count++) {
780 sprintf(uid->vduit+2*count, "%02x",
781 private->vdsneq->uit[count]);
782 }
783 }
784 }
785
786 /*
787 * Generate device unique id that specifies the physical device.
788 */
789 static int dasd_eckd_generate_uid(struct dasd_device *device)
790 {
791 struct dasd_eckd_private *private;
792 unsigned long flags;
793
794 private = (struct dasd_eckd_private *) device->private;
795 if (!private)
796 return -ENODEV;
797 if (!private->ned || !private->gneq)
798 return -ENODEV;
799 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
800 create_uid(private);
801 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
802 return 0;
803 }
804
805 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
806 {
807 struct dasd_eckd_private *private;
808 unsigned long flags;
809
810 if (device->private) {
811 private = (struct dasd_eckd_private *)device->private;
812 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
813 *uid = private->uid;
814 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
815 return 0;
816 }
817 return -EINVAL;
818 }
819
820 /*
821 * compare device UID with data of a given dasd_eckd_private structure
822 * return 0 for match
823 */
824 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
825 struct dasd_eckd_private *private)
826 {
827 struct dasd_uid device_uid;
828
829 create_uid(private);
830 dasd_eckd_get_uid(device, &device_uid);
831
832 return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
833 }
834
835 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
836 struct dasd_ccw_req *cqr,
837 __u8 *rcd_buffer,
838 __u8 lpm)
839 {
840 struct ccw1 *ccw;
841 /*
842 * buffer has to start with EBCDIC "V1.0" to show
843 * support for virtual device SNEQ
844 */
845 rcd_buffer[0] = 0xE5;
846 rcd_buffer[1] = 0xF1;
847 rcd_buffer[2] = 0x4B;
848 rcd_buffer[3] = 0xF0;
849
850 ccw = cqr->cpaddr;
851 ccw->cmd_code = DASD_ECKD_CCW_RCD;
852 ccw->flags = 0;
853 ccw->cda = (__u32)(addr_t)rcd_buffer;
854 ccw->count = DASD_ECKD_RCD_DATA_SIZE;
855 cqr->magic = DASD_ECKD_MAGIC;
856
857 cqr->startdev = device;
858 cqr->memdev = device;
859 cqr->block = NULL;
860 cqr->expires = 10*HZ;
861 cqr->lpm = lpm;
862 cqr->retries = 256;
863 cqr->buildclk = get_clock();
864 cqr->status = DASD_CQR_FILLED;
865 set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
866 }
867
868 /*
869 * Wakeup helper for read_conf
870 * if the cqr is not done and needs some error recovery
871 * the buffer has to be re-initialized with the EBCDIC "V1.0"
872 * to show support for virtual device SNEQ
873 */
874 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
875 {
876 struct ccw1 *ccw;
877 __u8 *rcd_buffer;
878
879 if (cqr->status != DASD_CQR_DONE) {
880 ccw = cqr->cpaddr;
881 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
882 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
883
884 rcd_buffer[0] = 0xE5;
885 rcd_buffer[1] = 0xF1;
886 rcd_buffer[2] = 0x4B;
887 rcd_buffer[3] = 0xF0;
888 }
889 dasd_wakeup_cb(cqr, data);
890 }
891
892 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
893 struct dasd_ccw_req *cqr,
894 __u8 *rcd_buffer,
895 __u8 lpm)
896 {
897 struct ciw *ciw;
898 int rc;
899 /*
900 * sanity check: scan for RCD command in extended SenseID data
901 * some devices do not support RCD
902 */
903 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
904 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
905 return -EOPNOTSUPP;
906
907 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
908 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
909 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
910 cqr->retries = 5;
911 cqr->callback = read_conf_cb;
912 rc = dasd_sleep_on_immediatly(cqr);
913 return rc;
914 }
915
916 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
917 void **rcd_buffer,
918 int *rcd_buffer_size, __u8 lpm)
919 {
920 struct ciw *ciw;
921 char *rcd_buf = NULL;
922 int ret;
923 struct dasd_ccw_req *cqr;
924
925 /*
926 * sanity check: scan for RCD command in extended SenseID data
927 * some devices do not support RCD
928 */
929 ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
930 if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
931 ret = -EOPNOTSUPP;
932 goto out_error;
933 }
934 rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
935 if (!rcd_buf) {
936 ret = -ENOMEM;
937 goto out_error;
938 }
939 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
940 0, /* use rcd_buf as data ara */
941 device);
942 if (IS_ERR(cqr)) {
943 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
944 "Could not allocate RCD request");
945 ret = -ENOMEM;
946 goto out_error;
947 }
948 dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
949 cqr->callback = read_conf_cb;
950 ret = dasd_sleep_on(cqr);
951 /*
952 * on success we update the user input parms
953 */
954 dasd_sfree_request(cqr, cqr->memdev);
955 if (ret)
956 goto out_error;
957
958 *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
959 *rcd_buffer = rcd_buf;
960 return 0;
961 out_error:
962 kfree(rcd_buf);
963 *rcd_buffer = NULL;
964 *rcd_buffer_size = 0;
965 return ret;
966 }
967
968 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
969 {
970
971 struct dasd_sneq *sneq;
972 int i, count;
973
974 private->ned = NULL;
975 private->sneq = NULL;
976 private->vdsneq = NULL;
977 private->gneq = NULL;
978 count = private->conf_len / sizeof(struct dasd_sneq);
979 sneq = (struct dasd_sneq *)private->conf_data;
980 for (i = 0; i < count; ++i) {
981 if (sneq->flags.identifier == 1 && sneq->format == 1)
982 private->sneq = sneq;
983 else if (sneq->flags.identifier == 1 && sneq->format == 4)
984 private->vdsneq = (struct vd_sneq *)sneq;
985 else if (sneq->flags.identifier == 2)
986 private->gneq = (struct dasd_gneq *)sneq;
987 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
988 private->ned = (struct dasd_ned *)sneq;
989 sneq++;
990 }
991 if (!private->ned || !private->gneq) {
992 private->ned = NULL;
993 private->sneq = NULL;
994 private->vdsneq = NULL;
995 private->gneq = NULL;
996 return -EINVAL;
997 }
998 return 0;
999
1000 };
1001
1002 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1003 {
1004 struct dasd_gneq *gneq;
1005 int i, count, found;
1006
1007 count = conf_len / sizeof(*gneq);
1008 gneq = (struct dasd_gneq *)conf_data;
1009 found = 0;
1010 for (i = 0; i < count; ++i) {
1011 if (gneq->flags.identifier == 2) {
1012 found = 1;
1013 break;
1014 }
1015 gneq++;
1016 }
1017 if (found)
1018 return ((char *)gneq)[18] & 0x07;
1019 else
1020 return 0;
1021 }
1022
1023 static int dasd_eckd_read_conf(struct dasd_device *device)
1024 {
1025 void *conf_data;
1026 int conf_len, conf_data_saved;
1027 int rc;
1028 __u8 lpm, opm;
1029 struct dasd_eckd_private *private, path_private;
1030 struct dasd_path *path_data;
1031 struct dasd_uid *uid;
1032 char print_path_uid[60], print_device_uid[60];
1033
1034 private = (struct dasd_eckd_private *) device->private;
1035 path_data = &device->path_data;
1036 opm = ccw_device_get_path_mask(device->cdev);
1037 conf_data_saved = 0;
1038 /* get configuration data per operational path */
1039 for (lpm = 0x80; lpm; lpm>>= 1) {
1040 if (!(lpm & opm))
1041 continue;
1042 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1043 &conf_len, lpm);
1044 if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
1045 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1046 "Read configuration data returned "
1047 "error %d", rc);
1048 return rc;
1049 }
1050 if (conf_data == NULL) {
1051 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1052 "No configuration data "
1053 "retrieved");
1054 /* no further analysis possible */
1055 path_data->opm |= lpm;
1056 continue; /* no error */
1057 }
1058 /* save first valid configuration data */
1059 if (!conf_data_saved) {
1060 kfree(private->conf_data);
1061 private->conf_data = conf_data;
1062 private->conf_len = conf_len;
1063 if (dasd_eckd_identify_conf_parts(private)) {
1064 private->conf_data = NULL;
1065 private->conf_len = 0;
1066 kfree(conf_data);
1067 continue;
1068 }
1069 /*
1070 * build device UID that other path data
1071 * can be compared to it
1072 */
1073 dasd_eckd_generate_uid(device);
1074 conf_data_saved++;
1075 } else {
1076 path_private.conf_data = conf_data;
1077 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1078 if (dasd_eckd_identify_conf_parts(
1079 &path_private)) {
1080 path_private.conf_data = NULL;
1081 path_private.conf_len = 0;
1082 kfree(conf_data);
1083 continue;
1084 }
1085
1086 if (dasd_eckd_compare_path_uid(
1087 device, &path_private)) {
1088 uid = &path_private.uid;
1089 if (strlen(uid->vduit) > 0)
1090 snprintf(print_path_uid,
1091 sizeof(print_path_uid),
1092 "%s.%s.%04x.%02x.%s",
1093 uid->vendor, uid->serial,
1094 uid->ssid, uid->real_unit_addr,
1095 uid->vduit);
1096 else
1097 snprintf(print_path_uid,
1098 sizeof(print_path_uid),
1099 "%s.%s.%04x.%02x",
1100 uid->vendor, uid->serial,
1101 uid->ssid,
1102 uid->real_unit_addr);
1103 uid = &private->uid;
1104 if (strlen(uid->vduit) > 0)
1105 snprintf(print_device_uid,
1106 sizeof(print_device_uid),
1107 "%s.%s.%04x.%02x.%s",
1108 uid->vendor, uid->serial,
1109 uid->ssid, uid->real_unit_addr,
1110 uid->vduit);
1111 else
1112 snprintf(print_device_uid,
1113 sizeof(print_device_uid),
1114 "%s.%s.%04x.%02x",
1115 uid->vendor, uid->serial,
1116 uid->ssid,
1117 uid->real_unit_addr);
1118 dev_err(&device->cdev->dev,
1119 "Not all channel paths lead to "
1120 "the same device, path %02X leads to "
1121 "device %s instead of %s\n", lpm,
1122 print_path_uid, print_device_uid);
1123 return -EINVAL;
1124 }
1125
1126 path_private.conf_data = NULL;
1127 path_private.conf_len = 0;
1128 }
1129 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1130 case 0x02:
1131 path_data->npm |= lpm;
1132 break;
1133 case 0x03:
1134 path_data->ppm |= lpm;
1135 break;
1136 }
1137 path_data->opm |= lpm;
1138
1139 if (conf_data != private->conf_data)
1140 kfree(conf_data);
1141 }
1142
1143 return 0;
1144 }
1145
1146 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1147 {
1148 struct dasd_eckd_private *private;
1149 int mdc;
1150 u32 fcx_max_data;
1151
1152 private = (struct dasd_eckd_private *) device->private;
1153 if (private->fcx_max_data) {
1154 mdc = ccw_device_get_mdc(device->cdev, lpm);
1155 if ((mdc < 0)) {
1156 dev_warn(&device->cdev->dev,
1157 "Detecting the maximum data size for zHPF "
1158 "requests failed (rc=%d) for a new path %x\n",
1159 mdc, lpm);
1160 return mdc;
1161 }
1162 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1163 if (fcx_max_data < private->fcx_max_data) {
1164 dev_warn(&device->cdev->dev,
1165 "The maximum data size for zHPF requests %u "
1166 "on a new path %x is below the active maximum "
1167 "%u\n", fcx_max_data, lpm,
1168 private->fcx_max_data);
1169 return -EACCES;
1170 }
1171 }
1172 return 0;
1173 }
1174
1175 static int rebuild_device_uid(struct dasd_device *device,
1176 struct path_verification_work_data *data)
1177 {
1178 struct dasd_eckd_private *private;
1179 struct dasd_path *path_data;
1180 __u8 lpm, opm;
1181 int rc;
1182
1183 rc = -ENODEV;
1184 private = (struct dasd_eckd_private *) device->private;
1185 path_data = &device->path_data;
1186 opm = device->path_data.opm;
1187
1188 for (lpm = 0x80; lpm; lpm >>= 1) {
1189 if (!(lpm & opm))
1190 continue;
1191 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1192 memset(&data->cqr, 0, sizeof(data->cqr));
1193 data->cqr.cpaddr = &data->ccw;
1194 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1195 data->rcd_buffer,
1196 lpm);
1197
1198 if (rc) {
1199 if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1200 continue;
1201 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1202 "Read configuration data "
1203 "returned error %d", rc);
1204 break;
1205 }
1206 memcpy(private->conf_data, data->rcd_buffer,
1207 DASD_ECKD_RCD_DATA_SIZE);
1208 if (dasd_eckd_identify_conf_parts(private)) {
1209 rc = -ENODEV;
1210 } else /* first valid path is enough */
1211 break;
1212 }
1213
1214 if (!rc)
1215 rc = dasd_eckd_generate_uid(device);
1216
1217 return rc;
1218 }
1219
1220 static void do_path_verification_work(struct work_struct *work)
1221 {
1222 struct path_verification_work_data *data;
1223 struct dasd_device *device;
1224 struct dasd_eckd_private path_private;
1225 struct dasd_uid *uid;
1226 __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1227 __u8 lpm, opm, npm, ppm, epm;
1228 unsigned long flags;
1229 char print_uid[60];
1230 int rc;
1231
1232 data = container_of(work, struct path_verification_work_data, worker);
1233 device = data->device;
1234
1235 /* delay path verification until device was resumed */
1236 if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1237 schedule_work(work);
1238 return;
1239 }
1240
1241 opm = 0;
1242 npm = 0;
1243 ppm = 0;
1244 epm = 0;
1245 for (lpm = 0x80; lpm; lpm >>= 1) {
1246 if (!(lpm & data->tbvpm))
1247 continue;
1248 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1249 memset(&data->cqr, 0, sizeof(data->cqr));
1250 data->cqr.cpaddr = &data->ccw;
1251 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1252 data->rcd_buffer,
1253 lpm);
1254 if (!rc) {
1255 switch (dasd_eckd_path_access(data->rcd_buffer,
1256 DASD_ECKD_RCD_DATA_SIZE)
1257 ) {
1258 case 0x02:
1259 npm |= lpm;
1260 break;
1261 case 0x03:
1262 ppm |= lpm;
1263 break;
1264 }
1265 opm |= lpm;
1266 } else if (rc == -EOPNOTSUPP) {
1267 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1268 "path verification: No configuration "
1269 "data retrieved");
1270 opm |= lpm;
1271 } else if (rc == -EAGAIN) {
1272 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1273 "path verification: device is stopped,"
1274 " try again later");
1275 epm |= lpm;
1276 } else {
1277 dev_warn(&device->cdev->dev,
1278 "Reading device feature codes failed "
1279 "(rc=%d) for new path %x\n", rc, lpm);
1280 continue;
1281 }
1282 if (verify_fcx_max_data(device, lpm)) {
1283 opm &= ~lpm;
1284 npm &= ~lpm;
1285 ppm &= ~lpm;
1286 continue;
1287 }
1288
1289 /*
1290 * save conf_data for comparison after
1291 * rebuild_device_uid may have changed
1292 * the original data
1293 */
1294 memcpy(&path_rcd_buf, data->rcd_buffer,
1295 DASD_ECKD_RCD_DATA_SIZE);
1296 path_private.conf_data = (void *) &path_rcd_buf;
1297 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1298 if (dasd_eckd_identify_conf_parts(&path_private)) {
1299 path_private.conf_data = NULL;
1300 path_private.conf_len = 0;
1301 continue;
1302 }
1303
1304 /*
1305 * compare path UID with device UID only if at least
1306 * one valid path is left
1307 * in other case the device UID may have changed and
1308 * the first working path UID will be used as device UID
1309 */
1310 if (device->path_data.opm &&
1311 dasd_eckd_compare_path_uid(device, &path_private)) {
1312 /*
1313 * the comparison was not successful
1314 * rebuild the device UID with at least one
1315 * known path in case a z/VM hyperswap command
1316 * has changed the device
1317 *
1318 * after this compare again
1319 *
1320 * if either the rebuild or the recompare fails
1321 * the path can not be used
1322 */
1323 if (rebuild_device_uid(device, data) ||
1324 dasd_eckd_compare_path_uid(
1325 device, &path_private)) {
1326 uid = &path_private.uid;
1327 if (strlen(uid->vduit) > 0)
1328 snprintf(print_uid, sizeof(print_uid),
1329 "%s.%s.%04x.%02x.%s",
1330 uid->vendor, uid->serial,
1331 uid->ssid, uid->real_unit_addr,
1332 uid->vduit);
1333 else
1334 snprintf(print_uid, sizeof(print_uid),
1335 "%s.%s.%04x.%02x",
1336 uid->vendor, uid->serial,
1337 uid->ssid,
1338 uid->real_unit_addr);
1339 dev_err(&device->cdev->dev,
1340 "The newly added channel path %02X "
1341 "will not be used because it leads "
1342 "to a different device %s\n",
1343 lpm, print_uid);
1344 opm &= ~lpm;
1345 npm &= ~lpm;
1346 ppm &= ~lpm;
1347 continue;
1348 }
1349 }
1350
1351 /*
1352 * There is a small chance that a path is lost again between
1353 * above path verification and the following modification of
1354 * the device opm mask. We could avoid that race here by using
1355 * yet another path mask, but we rather deal with this unlikely
1356 * situation in dasd_start_IO.
1357 */
1358 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1359 if (!device->path_data.opm && opm) {
1360 device->path_data.opm = opm;
1361 dasd_generic_path_operational(device);
1362 } else
1363 device->path_data.opm |= opm;
1364 device->path_data.npm |= npm;
1365 device->path_data.ppm |= ppm;
1366 device->path_data.tbvpm |= epm;
1367 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1368 }
1369
1370 dasd_put_device(device);
1371 if (data->isglobal)
1372 mutex_unlock(&dasd_path_verification_mutex);
1373 else
1374 kfree(data);
1375 }
1376
1377 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1378 {
1379 struct path_verification_work_data *data;
1380
1381 data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1382 if (!data) {
1383 if (mutex_trylock(&dasd_path_verification_mutex)) {
1384 data = path_verification_worker;
1385 data->isglobal = 1;
1386 } else
1387 return -ENOMEM;
1388 } else {
1389 memset(data, 0, sizeof(*data));
1390 data->isglobal = 0;
1391 }
1392 INIT_WORK(&data->worker, do_path_verification_work);
1393 dasd_get_device(device);
1394 data->device = device;
1395 data->tbvpm = lpm;
1396 schedule_work(&data->worker);
1397 return 0;
1398 }
1399
1400 static int dasd_eckd_read_features(struct dasd_device *device)
1401 {
1402 struct dasd_psf_prssd_data *prssdp;
1403 struct dasd_rssd_features *features;
1404 struct dasd_ccw_req *cqr;
1405 struct ccw1 *ccw;
1406 int rc;
1407 struct dasd_eckd_private *private;
1408
1409 private = (struct dasd_eckd_private *) device->private;
1410 memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1411 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1412 (sizeof(struct dasd_psf_prssd_data) +
1413 sizeof(struct dasd_rssd_features)),
1414 device);
1415 if (IS_ERR(cqr)) {
1416 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1417 "allocate initialization request");
1418 return PTR_ERR(cqr);
1419 }
1420 cqr->startdev = device;
1421 cqr->memdev = device;
1422 cqr->block = NULL;
1423 cqr->retries = 256;
1424 cqr->expires = 10 * HZ;
1425
1426 /* Prepare for Read Subsystem Data */
1427 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1428 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1429 prssdp->order = PSF_ORDER_PRSSD;
1430 prssdp->suborder = 0x41; /* Read Feature Codes */
1431 /* all other bytes of prssdp must be zero */
1432
1433 ccw = cqr->cpaddr;
1434 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1435 ccw->count = sizeof(struct dasd_psf_prssd_data);
1436 ccw->flags |= CCW_FLAG_CC;
1437 ccw->cda = (__u32)(addr_t) prssdp;
1438
1439 /* Read Subsystem Data - feature codes */
1440 features = (struct dasd_rssd_features *) (prssdp + 1);
1441 memset(features, 0, sizeof(struct dasd_rssd_features));
1442
1443 ccw++;
1444 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1445 ccw->count = sizeof(struct dasd_rssd_features);
1446 ccw->cda = (__u32)(addr_t) features;
1447
1448 cqr->buildclk = get_clock();
1449 cqr->status = DASD_CQR_FILLED;
1450 rc = dasd_sleep_on(cqr);
1451 if (rc == 0) {
1452 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1453 features = (struct dasd_rssd_features *) (prssdp + 1);
1454 memcpy(&private->features, features,
1455 sizeof(struct dasd_rssd_features));
1456 } else
1457 dev_warn(&device->cdev->dev, "Reading device feature codes"
1458 " failed with rc=%d\n", rc);
1459 dasd_sfree_request(cqr, cqr->memdev);
1460 return rc;
1461 }
1462
1463
1464 /*
1465 * Build CP for Perform Subsystem Function - SSC.
1466 */
1467 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1468 int enable_pav)
1469 {
1470 struct dasd_ccw_req *cqr;
1471 struct dasd_psf_ssc_data *psf_ssc_data;
1472 struct ccw1 *ccw;
1473
1474 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1475 sizeof(struct dasd_psf_ssc_data),
1476 device);
1477
1478 if (IS_ERR(cqr)) {
1479 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1480 "Could not allocate PSF-SSC request");
1481 return cqr;
1482 }
1483 psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1484 psf_ssc_data->order = PSF_ORDER_SSC;
1485 psf_ssc_data->suborder = 0xc0;
1486 if (enable_pav) {
1487 psf_ssc_data->suborder |= 0x08;
1488 psf_ssc_data->reserved[0] = 0x88;
1489 }
1490 ccw = cqr->cpaddr;
1491 ccw->cmd_code = DASD_ECKD_CCW_PSF;
1492 ccw->cda = (__u32)(addr_t)psf_ssc_data;
1493 ccw->count = 66;
1494
1495 cqr->startdev = device;
1496 cqr->memdev = device;
1497 cqr->block = NULL;
1498 cqr->retries = 256;
1499 cqr->expires = 10*HZ;
1500 cqr->buildclk = get_clock();
1501 cqr->status = DASD_CQR_FILLED;
1502 return cqr;
1503 }
1504
1505 /*
1506 * Perform Subsystem Function.
1507 * It is necessary to trigger CIO for channel revalidation since this
1508 * call might change behaviour of DASD devices.
1509 */
1510 static int
1511 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
1512 {
1513 struct dasd_ccw_req *cqr;
1514 int rc;
1515
1516 cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1517 if (IS_ERR(cqr))
1518 return PTR_ERR(cqr);
1519
1520 rc = dasd_sleep_on(cqr);
1521 if (!rc)
1522 /* trigger CIO to reprobe devices */
1523 css_schedule_reprobe();
1524 dasd_sfree_request(cqr, cqr->memdev);
1525 return rc;
1526 }
1527
1528 /*
1529 * Valide storage server of current device.
1530 */
1531 static void dasd_eckd_validate_server(struct dasd_device *device)
1532 {
1533 int rc;
1534 struct dasd_eckd_private *private;
1535 int enable_pav;
1536
1537 private = (struct dasd_eckd_private *) device->private;
1538 if (private->uid.type == UA_BASE_PAV_ALIAS ||
1539 private->uid.type == UA_HYPER_PAV_ALIAS)
1540 return;
1541 if (dasd_nopav || MACHINE_IS_VM)
1542 enable_pav = 0;
1543 else
1544 enable_pav = 1;
1545 rc = dasd_eckd_psf_ssc(device, enable_pav);
1546
1547 /* may be requested feature is not available on server,
1548 * therefore just report error and go ahead */
1549 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1550 "returned rc=%d", private->uid.ssid, rc);
1551 }
1552
1553 /*
1554 * worker to do a validate server in case of a lost pathgroup
1555 */
1556 static void dasd_eckd_do_validate_server(struct work_struct *work)
1557 {
1558 struct dasd_device *device = container_of(work, struct dasd_device,
1559 kick_validate);
1560 dasd_eckd_validate_server(device);
1561 dasd_put_device(device);
1562 }
1563
1564 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1565 {
1566 dasd_get_device(device);
1567 /* queue call to do_validate_server to the kernel event daemon. */
1568 schedule_work(&device->kick_validate);
1569 }
1570
1571 static u32 get_fcx_max_data(struct dasd_device *device)
1572 {
1573 #if defined(CONFIG_64BIT)
1574 int tpm, mdc;
1575 int fcx_in_css, fcx_in_gneq, fcx_in_features;
1576 struct dasd_eckd_private *private;
1577
1578 if (dasd_nofcx)
1579 return 0;
1580 /* is transport mode supported? */
1581 private = (struct dasd_eckd_private *) device->private;
1582 fcx_in_css = css_general_characteristics.fcx;
1583 fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1584 fcx_in_features = private->features.feature[40] & 0x80;
1585 tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1586
1587 if (!tpm)
1588 return 0;
1589
1590 mdc = ccw_device_get_mdc(device->cdev, 0);
1591 if (mdc < 0) {
1592 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1593 " data size for zHPF requests failed\n");
1594 return 0;
1595 } else
1596 return mdc * FCX_MAX_DATA_FACTOR;
1597 #else
1598 return 0;
1599 #endif
1600 }
1601
1602 /*
1603 * Check device characteristics.
1604 * If the device is accessible using ECKD discipline, the device is enabled.
1605 */
1606 static int
1607 dasd_eckd_check_characteristics(struct dasd_device *device)
1608 {
1609 struct dasd_eckd_private *private;
1610 struct dasd_block *block;
1611 struct dasd_uid temp_uid;
1612 int rc, i;
1613 int readonly;
1614 unsigned long value;
1615
1616 /* setup work queue for validate server*/
1617 INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1618
1619 if (!ccw_device_is_pathgroup(device->cdev)) {
1620 dev_warn(&device->cdev->dev,
1621 "A channel path group could not be established\n");
1622 return -EIO;
1623 }
1624 if (!ccw_device_is_multipath(device->cdev)) {
1625 dev_info(&device->cdev->dev,
1626 "The DASD is not operating in multipath mode\n");
1627 }
1628 private = (struct dasd_eckd_private *) device->private;
1629 if (!private) {
1630 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1631 if (!private) {
1632 dev_warn(&device->cdev->dev,
1633 "Allocating memory for private DASD data "
1634 "failed\n");
1635 return -ENOMEM;
1636 }
1637 device->private = (void *) private;
1638 } else {
1639 memset(private, 0, sizeof(*private));
1640 }
1641 /* Invalidate status of initial analysis. */
1642 private->init_cqr_status = -1;
1643 /* Set default cache operations. */
1644 private->attrib.operation = DASD_NORMAL_CACHE;
1645 private->attrib.nr_cyl = 0;
1646
1647 /* Read Configuration Data */
1648 rc = dasd_eckd_read_conf(device);
1649 if (rc)
1650 goto out_err1;
1651
1652 /* set default timeout */
1653 device->default_expires = DASD_EXPIRES;
1654 if (private->gneq) {
1655 value = 1;
1656 for (i = 0; i < private->gneq->timeout.value; i++)
1657 value = 10 * value;
1658 value = value * private->gneq->timeout.number;
1659 /* do not accept useless values */
1660 if (value != 0 && value <= DASD_EXPIRES_MAX)
1661 device->default_expires = value;
1662 }
1663
1664 dasd_eckd_get_uid(device, &temp_uid);
1665 if (temp_uid.type == UA_BASE_DEVICE) {
1666 block = dasd_alloc_block();
1667 if (IS_ERR(block)) {
1668 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1669 "could not allocate dasd "
1670 "block structure");
1671 rc = PTR_ERR(block);
1672 goto out_err1;
1673 }
1674 device->block = block;
1675 block->base = device;
1676 }
1677
1678 /* register lcu with alias handling, enable PAV */
1679 rc = dasd_alias_make_device_known_to_lcu(device);
1680 if (rc)
1681 goto out_err2;
1682
1683 dasd_eckd_validate_server(device);
1684
1685 /* device may report different configuration data after LCU setup */
1686 rc = dasd_eckd_read_conf(device);
1687 if (rc)
1688 goto out_err3;
1689
1690 /* Read Feature Codes */
1691 dasd_eckd_read_features(device);
1692
1693 /* Read Device Characteristics */
1694 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1695 &private->rdc_data, 64);
1696 if (rc) {
1697 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1698 "Read device characteristic failed, rc=%d", rc);
1699 goto out_err3;
1700 }
1701
1702 if ((device->features & DASD_FEATURE_USERAW) &&
1703 !(private->rdc_data.facilities.RT_in_LR)) {
1704 dev_err(&device->cdev->dev, "The storage server does not "
1705 "support raw-track access\n");
1706 rc = -EINVAL;
1707 goto out_err3;
1708 }
1709
1710 /* find the valid cylinder size */
1711 if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1712 private->rdc_data.long_no_cyl)
1713 private->real_cyl = private->rdc_data.long_no_cyl;
1714 else
1715 private->real_cyl = private->rdc_data.no_cyl;
1716
1717 private->fcx_max_data = get_fcx_max_data(device);
1718
1719 readonly = dasd_device_is_ro(device);
1720 if (readonly)
1721 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1722
1723 dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1724 "with %d cylinders, %d heads, %d sectors%s\n",
1725 private->rdc_data.dev_type,
1726 private->rdc_data.dev_model,
1727 private->rdc_data.cu_type,
1728 private->rdc_data.cu_model.model,
1729 private->real_cyl,
1730 private->rdc_data.trk_per_cyl,
1731 private->rdc_data.sec_per_trk,
1732 readonly ? ", read-only device" : "");
1733 return 0;
1734
1735 out_err3:
1736 dasd_alias_disconnect_device_from_lcu(device);
1737 out_err2:
1738 dasd_free_block(device->block);
1739 device->block = NULL;
1740 out_err1:
1741 kfree(private->conf_data);
1742 kfree(device->private);
1743 device->private = NULL;
1744 return rc;
1745 }
1746
1747 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1748 {
1749 struct dasd_eckd_private *private;
1750
1751 private = (struct dasd_eckd_private *) device->private;
1752 dasd_alias_disconnect_device_from_lcu(device);
1753 private->ned = NULL;
1754 private->sneq = NULL;
1755 private->vdsneq = NULL;
1756 private->gneq = NULL;
1757 private->conf_len = 0;
1758 kfree(private->conf_data);
1759 private->conf_data = NULL;
1760 }
1761
1762 static struct dasd_ccw_req *
1763 dasd_eckd_analysis_ccw(struct dasd_device *device)
1764 {
1765 struct dasd_eckd_private *private;
1766 struct eckd_count *count_data;
1767 struct LO_eckd_data *LO_data;
1768 struct dasd_ccw_req *cqr;
1769 struct ccw1 *ccw;
1770 int cplength, datasize;
1771 int i;
1772
1773 private = (struct dasd_eckd_private *) device->private;
1774
1775 cplength = 8;
1776 datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1777 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1778 if (IS_ERR(cqr))
1779 return cqr;
1780 ccw = cqr->cpaddr;
1781 /* Define extent for the first 3 tracks. */
1782 define_extent(ccw++, cqr->data, 0, 2,
1783 DASD_ECKD_CCW_READ_COUNT, device);
1784 LO_data = cqr->data + sizeof(struct DE_eckd_data);
1785 /* Locate record for the first 4 records on track 0. */
1786 ccw[-1].flags |= CCW_FLAG_CC;
1787 locate_record(ccw++, LO_data++, 0, 0, 4,
1788 DASD_ECKD_CCW_READ_COUNT, device, 0);
1789
1790 count_data = private->count_area;
1791 for (i = 0; i < 4; i++) {
1792 ccw[-1].flags |= CCW_FLAG_CC;
1793 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1794 ccw->flags = 0;
1795 ccw->count = 8;
1796 ccw->cda = (__u32)(addr_t) count_data;
1797 ccw++;
1798 count_data++;
1799 }
1800
1801 /* Locate record for the first record on track 2. */
1802 ccw[-1].flags |= CCW_FLAG_CC;
1803 locate_record(ccw++, LO_data++, 2, 0, 1,
1804 DASD_ECKD_CCW_READ_COUNT, device, 0);
1805 /* Read count ccw. */
1806 ccw[-1].flags |= CCW_FLAG_CC;
1807 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1808 ccw->flags = 0;
1809 ccw->count = 8;
1810 ccw->cda = (__u32)(addr_t) count_data;
1811
1812 cqr->block = NULL;
1813 cqr->startdev = device;
1814 cqr->memdev = device;
1815 cqr->retries = 255;
1816 cqr->buildclk = get_clock();
1817 cqr->status = DASD_CQR_FILLED;
1818 return cqr;
1819 }
1820
1821 /* differentiate between 'no record found' and any other error */
1822 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1823 {
1824 char *sense;
1825 if (init_cqr->status == DASD_CQR_DONE)
1826 return INIT_CQR_OK;
1827 else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1828 init_cqr->status == DASD_CQR_FAILED) {
1829 sense = dasd_get_sense(&init_cqr->irb);
1830 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1831 return INIT_CQR_UNFORMATTED;
1832 else
1833 return INIT_CQR_ERROR;
1834 } else
1835 return INIT_CQR_ERROR;
1836 }
1837
1838 /*
1839 * This is the callback function for the init_analysis cqr. It saves
1840 * the status of the initial analysis ccw before it frees it and kicks
1841 * the device to continue the startup sequence. This will call
1842 * dasd_eckd_do_analysis again (if the devices has not been marked
1843 * for deletion in the meantime).
1844 */
1845 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1846 void *data)
1847 {
1848 struct dasd_eckd_private *private;
1849 struct dasd_device *device;
1850
1851 device = init_cqr->startdev;
1852 private = (struct dasd_eckd_private *) device->private;
1853 private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1854 dasd_sfree_request(init_cqr, device);
1855 dasd_kick_device(device);
1856 }
1857
1858 static int dasd_eckd_start_analysis(struct dasd_block *block)
1859 {
1860 struct dasd_ccw_req *init_cqr;
1861
1862 init_cqr = dasd_eckd_analysis_ccw(block->base);
1863 if (IS_ERR(init_cqr))
1864 return PTR_ERR(init_cqr);
1865 init_cqr->callback = dasd_eckd_analysis_callback;
1866 init_cqr->callback_data = NULL;
1867 init_cqr->expires = 5*HZ;
1868 /* first try without ERP, so we can later handle unformatted
1869 * devices as special case
1870 */
1871 clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1872 init_cqr->retries = 0;
1873 dasd_add_request_head(init_cqr);
1874 return -EAGAIN;
1875 }
1876
1877 static int dasd_eckd_end_analysis(struct dasd_block *block)
1878 {
1879 struct dasd_device *device;
1880 struct dasd_eckd_private *private;
1881 struct eckd_count *count_area;
1882 unsigned int sb, blk_per_trk;
1883 int status, i;
1884 struct dasd_ccw_req *init_cqr;
1885
1886 device = block->base;
1887 private = (struct dasd_eckd_private *) device->private;
1888 status = private->init_cqr_status;
1889 private->init_cqr_status = -1;
1890 if (status == INIT_CQR_ERROR) {
1891 /* try again, this time with full ERP */
1892 init_cqr = dasd_eckd_analysis_ccw(device);
1893 dasd_sleep_on(init_cqr);
1894 status = dasd_eckd_analysis_evaluation(init_cqr);
1895 dasd_sfree_request(init_cqr, device);
1896 }
1897
1898 if (device->features & DASD_FEATURE_USERAW) {
1899 block->bp_block = DASD_RAW_BLOCKSIZE;
1900 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1901 block->s2b_shift = 3;
1902 goto raw;
1903 }
1904
1905 if (status == INIT_CQR_UNFORMATTED) {
1906 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1907 return -EMEDIUMTYPE;
1908 } else if (status == INIT_CQR_ERROR) {
1909 dev_err(&device->cdev->dev,
1910 "Detecting the DASD disk layout failed because "
1911 "of an I/O error\n");
1912 return -EIO;
1913 }
1914
1915 private->uses_cdl = 1;
1916 /* Check Track 0 for Compatible Disk Layout */
1917 count_area = NULL;
1918 for (i = 0; i < 3; i++) {
1919 if (private->count_area[i].kl != 4 ||
1920 private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1921 private->uses_cdl = 0;
1922 break;
1923 }
1924 }
1925 if (i == 3)
1926 count_area = &private->count_area[4];
1927
1928 if (private->uses_cdl == 0) {
1929 for (i = 0; i < 5; i++) {
1930 if ((private->count_area[i].kl != 0) ||
1931 (private->count_area[i].dl !=
1932 private->count_area[0].dl))
1933 break;
1934 }
1935 if (i == 5)
1936 count_area = &private->count_area[0];
1937 } else {
1938 if (private->count_area[3].record == 1)
1939 dev_warn(&device->cdev->dev,
1940 "Track 0 has no records following the VTOC\n");
1941 }
1942
1943 if (count_area != NULL && count_area->kl == 0) {
1944 /* we found notthing violating our disk layout */
1945 if (dasd_check_blocksize(count_area->dl) == 0)
1946 block->bp_block = count_area->dl;
1947 }
1948 if (block->bp_block == 0) {
1949 dev_warn(&device->cdev->dev,
1950 "The disk layout of the DASD is not supported\n");
1951 return -EMEDIUMTYPE;
1952 }
1953 block->s2b_shift = 0; /* bits to shift 512 to get a block */
1954 for (sb = 512; sb < block->bp_block; sb = sb << 1)
1955 block->s2b_shift++;
1956
1957 blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1958
1959 raw:
1960 block->blocks = (private->real_cyl *
1961 private->rdc_data.trk_per_cyl *
1962 blk_per_trk);
1963
1964 dev_info(&device->cdev->dev,
1965 "DASD with %d KB/block, %d KB total size, %d KB/track, "
1966 "%s\n", (block->bp_block >> 10),
1967 ((private->real_cyl *
1968 private->rdc_data.trk_per_cyl *
1969 blk_per_trk * (block->bp_block >> 9)) >> 1),
1970 ((blk_per_trk * block->bp_block) >> 10),
1971 private->uses_cdl ?
1972 "compatible disk layout" : "linux disk layout");
1973
1974 return 0;
1975 }
1976
1977 static int dasd_eckd_do_analysis(struct dasd_block *block)
1978 {
1979 struct dasd_eckd_private *private;
1980
1981 private = (struct dasd_eckd_private *) block->base->private;
1982 if (private->init_cqr_status < 0)
1983 return dasd_eckd_start_analysis(block);
1984 else
1985 return dasd_eckd_end_analysis(block);
1986 }
1987
1988 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1989 {
1990 return dasd_alias_add_device(device);
1991 };
1992
1993 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1994 {
1995 cancel_work_sync(&device->reload_device);
1996 return dasd_alias_remove_device(device);
1997 };
1998
1999 static int
2000 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2001 {
2002 struct dasd_eckd_private *private;
2003
2004 private = (struct dasd_eckd_private *) block->base->private;
2005 if (dasd_check_blocksize(block->bp_block) == 0) {
2006 geo->sectors = recs_per_track(&private->rdc_data,
2007 0, block->bp_block);
2008 }
2009 geo->cylinders = private->rdc_data.no_cyl;
2010 geo->heads = private->rdc_data.trk_per_cyl;
2011 return 0;
2012 }
2013
2014 static struct dasd_ccw_req *
2015 dasd_eckd_format_device(struct dasd_device * device,
2016 struct format_data_t * fdata)
2017 {
2018 struct dasd_eckd_private *private;
2019 struct dasd_ccw_req *fcp;
2020 struct eckd_count *ect;
2021 struct ccw1 *ccw;
2022 void *data;
2023 int rpt;
2024 struct ch_t address;
2025 int cplength, datasize;
2026 int i;
2027 int intensity = 0;
2028 int r0_perm;
2029
2030 private = (struct dasd_eckd_private *) device->private;
2031 rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
2032 set_ch_t(&address,
2033 fdata->start_unit / private->rdc_data.trk_per_cyl,
2034 fdata->start_unit % private->rdc_data.trk_per_cyl);
2035
2036 /* Sanity checks. */
2037 if (fdata->start_unit >=
2038 (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2039 dev_warn(&device->cdev->dev, "Start track number %d used in "
2040 "formatting is too big\n", fdata->start_unit);
2041 return ERR_PTR(-EINVAL);
2042 }
2043 if (fdata->start_unit > fdata->stop_unit) {
2044 dev_warn(&device->cdev->dev, "Start track %d used in "
2045 "formatting exceeds end track\n", fdata->start_unit);
2046 return ERR_PTR(-EINVAL);
2047 }
2048 if (dasd_check_blocksize(fdata->blksize) != 0) {
2049 dev_warn(&device->cdev->dev,
2050 "The DASD cannot be formatted with block size %d\n",
2051 fdata->blksize);
2052 return ERR_PTR(-EINVAL);
2053 }
2054
2055 /*
2056 * fdata->intensity is a bit string that tells us what to do:
2057 * Bit 0: write record zero
2058 * Bit 1: write home address, currently not supported
2059 * Bit 2: invalidate tracks
2060 * Bit 3: use OS/390 compatible disk layout (cdl)
2061 * Bit 4: do not allow storage subsystem to modify record zero
2062 * Only some bit combinations do make sense.
2063 */
2064 if (fdata->intensity & 0x10) {
2065 r0_perm = 0;
2066 intensity = fdata->intensity & ~0x10;
2067 } else {
2068 r0_perm = 1;
2069 intensity = fdata->intensity;
2070 }
2071 switch (intensity) {
2072 case 0x00: /* Normal format */
2073 case 0x08: /* Normal format, use cdl. */
2074 cplength = 2 + rpt;
2075 datasize = sizeof(struct DE_eckd_data) +
2076 sizeof(struct LO_eckd_data) +
2077 rpt * sizeof(struct eckd_count);
2078 break;
2079 case 0x01: /* Write record zero and format track. */
2080 case 0x09: /* Write record zero and format track, use cdl. */
2081 cplength = 3 + rpt;
2082 datasize = sizeof(struct DE_eckd_data) +
2083 sizeof(struct LO_eckd_data) +
2084 sizeof(struct eckd_count) +
2085 rpt * sizeof(struct eckd_count);
2086 break;
2087 case 0x04: /* Invalidate track. */
2088 case 0x0c: /* Invalidate track, use cdl. */
2089 cplength = 3;
2090 datasize = sizeof(struct DE_eckd_data) +
2091 sizeof(struct LO_eckd_data) +
2092 sizeof(struct eckd_count);
2093 break;
2094 default:
2095 dev_warn(&device->cdev->dev, "An I/O control call used "
2096 "incorrect flags 0x%x\n", fdata->intensity);
2097 return ERR_PTR(-EINVAL);
2098 }
2099 /* Allocate the format ccw request. */
2100 fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
2101 if (IS_ERR(fcp))
2102 return fcp;
2103
2104 data = fcp->data;
2105 ccw = fcp->cpaddr;
2106
2107 switch (intensity & ~0x08) {
2108 case 0x00: /* Normal format. */
2109 define_extent(ccw++, (struct DE_eckd_data *) data,
2110 fdata->start_unit, fdata->start_unit,
2111 DASD_ECKD_CCW_WRITE_CKD, device);
2112 /* grant subsystem permission to format R0 */
2113 if (r0_perm)
2114 ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
2115 data += sizeof(struct DE_eckd_data);
2116 ccw[-1].flags |= CCW_FLAG_CC;
2117 locate_record(ccw++, (struct LO_eckd_data *) data,
2118 fdata->start_unit, 0, rpt,
2119 DASD_ECKD_CCW_WRITE_CKD, device,
2120 fdata->blksize);
2121 data += sizeof(struct LO_eckd_data);
2122 break;
2123 case 0x01: /* Write record zero + format track. */
2124 define_extent(ccw++, (struct DE_eckd_data *) data,
2125 fdata->start_unit, fdata->start_unit,
2126 DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2127 device);
2128 data += sizeof(struct DE_eckd_data);
2129 ccw[-1].flags |= CCW_FLAG_CC;
2130 locate_record(ccw++, (struct LO_eckd_data *) data,
2131 fdata->start_unit, 0, rpt + 1,
2132 DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
2133 device->block->bp_block);
2134 data += sizeof(struct LO_eckd_data);
2135 break;
2136 case 0x04: /* Invalidate track. */
2137 define_extent(ccw++, (struct DE_eckd_data *) data,
2138 fdata->start_unit, fdata->start_unit,
2139 DASD_ECKD_CCW_WRITE_CKD, device);
2140 data += sizeof(struct DE_eckd_data);
2141 ccw[-1].flags |= CCW_FLAG_CC;
2142 locate_record(ccw++, (struct LO_eckd_data *) data,
2143 fdata->start_unit, 0, 1,
2144 DASD_ECKD_CCW_WRITE_CKD, device, 8);
2145 data += sizeof(struct LO_eckd_data);
2146 break;
2147 }
2148 if (intensity & 0x01) { /* write record zero */
2149 ect = (struct eckd_count *) data;
2150 data += sizeof(struct eckd_count);
2151 ect->cyl = address.cyl;
2152 ect->head = address.head;
2153 ect->record = 0;
2154 ect->kl = 0;
2155 ect->dl = 8;
2156 ccw[-1].flags |= CCW_FLAG_CC;
2157 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2158 ccw->flags = CCW_FLAG_SLI;
2159 ccw->count = 8;
2160 ccw->cda = (__u32)(addr_t) ect;
2161 ccw++;
2162 }
2163 if ((intensity & ~0x08) & 0x04) { /* erase track */
2164 ect = (struct eckd_count *) data;
2165 data += sizeof(struct eckd_count);
2166 ect->cyl = address.cyl;
2167 ect->head = address.head;
2168 ect->record = 1;
2169 ect->kl = 0;
2170 ect->dl = 0;
2171 ccw[-1].flags |= CCW_FLAG_CC;
2172 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2173 ccw->flags = CCW_FLAG_SLI;
2174 ccw->count = 8;
2175 ccw->cda = (__u32)(addr_t) ect;
2176 } else { /* write remaining records */
2177 for (i = 0; i < rpt; i++) {
2178 ect = (struct eckd_count *) data;
2179 data += sizeof(struct eckd_count);
2180 ect->cyl = address.cyl;
2181 ect->head = address.head;
2182 ect->record = i + 1;
2183 ect->kl = 0;
2184 ect->dl = fdata->blksize;
2185 /* Check for special tracks 0-1 when formatting CDL */
2186 if ((intensity & 0x08) &&
2187 fdata->start_unit == 0) {
2188 if (i < 3) {
2189 ect->kl = 4;
2190 ect->dl = sizes_trk0[i] - 4;
2191 }
2192 }
2193 if ((intensity & 0x08) &&
2194 fdata->start_unit == 1) {
2195 ect->kl = 44;
2196 ect->dl = LABEL_SIZE - 44;
2197 }
2198 ccw[-1].flags |= CCW_FLAG_CC;
2199 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2200 ccw->flags = CCW_FLAG_SLI;
2201 ccw->count = 8;
2202 ccw->cda = (__u32)(addr_t) ect;
2203 ccw++;
2204 }
2205 }
2206 fcp->startdev = device;
2207 fcp->memdev = device;
2208 fcp->retries = 256;
2209 fcp->buildclk = get_clock();
2210 fcp->status = DASD_CQR_FILLED;
2211 return fcp;
2212 }
2213
2214 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2215 {
2216 cqr->status = DASD_CQR_FILLED;
2217 if (cqr->block && (cqr->startdev != cqr->block->base)) {
2218 dasd_eckd_reset_ccw_to_base_io(cqr);
2219 cqr->startdev = cqr->block->base;
2220 cqr->lpm = cqr->block->base->path_data.opm;
2221 }
2222 };
2223
2224 static dasd_erp_fn_t
2225 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2226 {
2227 struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2228 struct ccw_device *cdev = device->cdev;
2229
2230 switch (cdev->id.cu_type) {
2231 case 0x3990:
2232 case 0x2105:
2233 case 0x2107:
2234 case 0x1750:
2235 return dasd_3990_erp_action;
2236 case 0x9343:
2237 case 0x3880:
2238 default:
2239 return dasd_default_erp_action;
2240 }
2241 }
2242
2243 static dasd_erp_fn_t
2244 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2245 {
2246 return dasd_default_erp_postaction;
2247 }
2248
2249 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2250 struct dasd_ccw_req *cqr,
2251 struct irb *irb)
2252 {
2253 char mask;
2254 char *sense = NULL;
2255 struct dasd_eckd_private *private;
2256
2257 private = (struct dasd_eckd_private *) device->private;
2258 /* first of all check for state change pending interrupt */
2259 mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2260 if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2261 /*
2262 * for alias only, not in offline processing
2263 * and only if not suspended
2264 */
2265 if (!device->block && private->lcu &&
2266 !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2267 !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2268 /*
2269 * the state change could be caused by an alias
2270 * reassignment remove device from alias handling
2271 * to prevent new requests from being scheduled on
2272 * the wrong alias device
2273 */
2274 dasd_alias_remove_device(device);
2275
2276 /* schedule worker to reload device */
2277 dasd_reload_device(device);
2278 }
2279 dasd_generic_handle_state_change(device);
2280 return;
2281 }
2282
2283 sense = dasd_get_sense(irb);
2284 if (!sense)
2285 return;
2286
2287 /* summary unit check */
2288 if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2289 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2290 dasd_alias_handle_summary_unit_check(device, irb);
2291 return;
2292 }
2293
2294 /* service information message SIM */
2295 if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2296 ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2297 dasd_3990_erp_handle_sim(device, sense);
2298 return;
2299 }
2300
2301 /* loss of device reservation is handled via base devices only
2302 * as alias devices may be used with several bases
2303 */
2304 if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2305 (sense[7] == 0x3F) &&
2306 (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2307 test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2308 if (device->features & DASD_FEATURE_FAILONSLCK)
2309 set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2310 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2311 dev_err(&device->cdev->dev,
2312 "The device reservation was lost\n");
2313 }
2314 }
2315
2316 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2317 struct dasd_device *startdev,
2318 struct dasd_block *block,
2319 struct request *req,
2320 sector_t first_rec,
2321 sector_t last_rec,
2322 sector_t first_trk,
2323 sector_t last_trk,
2324 unsigned int first_offs,
2325 unsigned int last_offs,
2326 unsigned int blk_per_trk,
2327 unsigned int blksize)
2328 {
2329 struct dasd_eckd_private *private;
2330 unsigned long *idaws;
2331 struct LO_eckd_data *LO_data;
2332 struct dasd_ccw_req *cqr;
2333 struct ccw1 *ccw;
2334 struct req_iterator iter;
2335 struct bio_vec *bv;
2336 char *dst;
2337 unsigned int off;
2338 int count, cidaw, cplength, datasize;
2339 sector_t recid;
2340 unsigned char cmd, rcmd;
2341 int use_prefix;
2342 struct dasd_device *basedev;
2343
2344 basedev = block->base;
2345 private = (struct dasd_eckd_private *) basedev->private;
2346 if (rq_data_dir(req) == READ)
2347 cmd = DASD_ECKD_CCW_READ_MT;
2348 else if (rq_data_dir(req) == WRITE)
2349 cmd = DASD_ECKD_CCW_WRITE_MT;
2350 else
2351 return ERR_PTR(-EINVAL);
2352
2353 /* Check struct bio and count the number of blocks for the request. */
2354 count = 0;
2355 cidaw = 0;
2356 rq_for_each_segment(bv, req, iter) {
2357 if (bv->bv_len & (blksize - 1))
2358 /* Eckd can only do full blocks. */
2359 return ERR_PTR(-EINVAL);
2360 count += bv->bv_len >> (block->s2b_shift + 9);
2361 #if defined(CONFIG_64BIT)
2362 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2363 cidaw += bv->bv_len >> (block->s2b_shift + 9);
2364 #endif
2365 }
2366 /* Paranoia. */
2367 if (count != last_rec - first_rec + 1)
2368 return ERR_PTR(-EINVAL);
2369
2370 /* use the prefix command if available */
2371 use_prefix = private->features.feature[8] & 0x01;
2372 if (use_prefix) {
2373 /* 1x prefix + number of blocks */
2374 cplength = 2 + count;
2375 /* 1x prefix + cidaws*sizeof(long) */
2376 datasize = sizeof(struct PFX_eckd_data) +
2377 sizeof(struct LO_eckd_data) +
2378 cidaw * sizeof(unsigned long);
2379 } else {
2380 /* 1x define extent + 1x locate record + number of blocks */
2381 cplength = 2 + count;
2382 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2383 datasize = sizeof(struct DE_eckd_data) +
2384 sizeof(struct LO_eckd_data) +
2385 cidaw * sizeof(unsigned long);
2386 }
2387 /* Find out the number of additional locate record ccws for cdl. */
2388 if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2389 if (last_rec >= 2*blk_per_trk)
2390 count = 2*blk_per_trk - first_rec;
2391 cplength += count;
2392 datasize += count*sizeof(struct LO_eckd_data);
2393 }
2394 /* Allocate the ccw request. */
2395 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2396 startdev);
2397 if (IS_ERR(cqr))
2398 return cqr;
2399 ccw = cqr->cpaddr;
2400 /* First ccw is define extent or prefix. */
2401 if (use_prefix) {
2402 if (prefix(ccw++, cqr->data, first_trk,
2403 last_trk, cmd, basedev, startdev) == -EAGAIN) {
2404 /* Clock not in sync and XRC is enabled.
2405 * Try again later.
2406 */
2407 dasd_sfree_request(cqr, startdev);
2408 return ERR_PTR(-EAGAIN);
2409 }
2410 idaws = (unsigned long *) (cqr->data +
2411 sizeof(struct PFX_eckd_data));
2412 } else {
2413 if (define_extent(ccw++, cqr->data, first_trk,
2414 last_trk, cmd, basedev) == -EAGAIN) {
2415 /* Clock not in sync and XRC is enabled.
2416 * Try again later.
2417 */
2418 dasd_sfree_request(cqr, startdev);
2419 return ERR_PTR(-EAGAIN);
2420 }
2421 idaws = (unsigned long *) (cqr->data +
2422 sizeof(struct DE_eckd_data));
2423 }
2424 /* Build locate_record+read/write/ccws. */
2425 LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2426 recid = first_rec;
2427 if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2428 /* Only standard blocks so there is just one locate record. */
2429 ccw[-1].flags |= CCW_FLAG_CC;
2430 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2431 last_rec - recid + 1, cmd, basedev, blksize);
2432 }
2433 rq_for_each_segment(bv, req, iter) {
2434 dst = page_address(bv->bv_page) + bv->bv_offset;
2435 if (dasd_page_cache) {
2436 char *copy = kmem_cache_alloc(dasd_page_cache,
2437 GFP_DMA | __GFP_NOWARN);
2438 if (copy && rq_data_dir(req) == WRITE)
2439 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2440 if (copy)
2441 dst = copy + bv->bv_offset;
2442 }
2443 for (off = 0; off < bv->bv_len; off += blksize) {
2444 sector_t trkid = recid;
2445 unsigned int recoffs = sector_div(trkid, blk_per_trk);
2446 rcmd = cmd;
2447 count = blksize;
2448 /* Locate record for cdl special block ? */
2449 if (private->uses_cdl && recid < 2*blk_per_trk) {
2450 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2451 rcmd |= 0x8;
2452 count = dasd_eckd_cdl_reclen(recid);
2453 if (count < blksize &&
2454 rq_data_dir(req) == READ)
2455 memset(dst + count, 0xe5,
2456 blksize - count);
2457 }
2458 ccw[-1].flags |= CCW_FLAG_CC;
2459 locate_record(ccw++, LO_data++,
2460 trkid, recoffs + 1,
2461 1, rcmd, basedev, count);
2462 }
2463 /* Locate record for standard blocks ? */
2464 if (private->uses_cdl && recid == 2*blk_per_trk) {
2465 ccw[-1].flags |= CCW_FLAG_CC;
2466 locate_record(ccw++, LO_data++,
2467 trkid, recoffs + 1,
2468 last_rec - recid + 1,
2469 cmd, basedev, count);
2470 }
2471 /* Read/write ccw. */
2472 ccw[-1].flags |= CCW_FLAG_CC;
2473 ccw->cmd_code = rcmd;
2474 ccw->count = count;
2475 if (idal_is_needed(dst, blksize)) {
2476 ccw->cda = (__u32)(addr_t) idaws;
2477 ccw->flags = CCW_FLAG_IDA;
2478 idaws = idal_create_words(idaws, dst, blksize);
2479 } else {
2480 ccw->cda = (__u32)(addr_t) dst;
2481 ccw->flags = 0;
2482 }
2483 ccw++;
2484 dst += blksize;
2485 recid++;
2486 }
2487 }
2488 if (blk_noretry_request(req) ||
2489 block->base->features & DASD_FEATURE_FAILFAST)
2490 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2491 cqr->startdev = startdev;
2492 cqr->memdev = startdev;
2493 cqr->block = block;
2494 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2495 cqr->lpm = startdev->path_data.ppm;
2496 cqr->retries = 256;
2497 cqr->buildclk = get_clock();
2498 cqr->status = DASD_CQR_FILLED;
2499 return cqr;
2500 }
2501
2502 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2503 struct dasd_device *startdev,
2504 struct dasd_block *block,
2505 struct request *req,
2506 sector_t first_rec,
2507 sector_t last_rec,
2508 sector_t first_trk,
2509 sector_t last_trk,
2510 unsigned int first_offs,
2511 unsigned int last_offs,
2512 unsigned int blk_per_trk,
2513 unsigned int blksize)
2514 {
2515 unsigned long *idaws;
2516 struct dasd_ccw_req *cqr;
2517 struct ccw1 *ccw;
2518 struct req_iterator iter;
2519 struct bio_vec *bv;
2520 char *dst, *idaw_dst;
2521 unsigned int cidaw, cplength, datasize;
2522 unsigned int tlf;
2523 sector_t recid;
2524 unsigned char cmd;
2525 struct dasd_device *basedev;
2526 unsigned int trkcount, count, count_to_trk_end;
2527 unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2528 unsigned char new_track, end_idaw;
2529 sector_t trkid;
2530 unsigned int recoffs;
2531
2532 basedev = block->base;
2533 if (rq_data_dir(req) == READ)
2534 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2535 else if (rq_data_dir(req) == WRITE)
2536 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2537 else
2538 return ERR_PTR(-EINVAL);
2539
2540 /* Track based I/O needs IDAWs for each page, and not just for
2541 * 64 bit addresses. We need additional idals for pages
2542 * that get filled from two tracks, so we use the number
2543 * of records as upper limit.
2544 */
2545 cidaw = last_rec - first_rec + 1;
2546 trkcount = last_trk - first_trk + 1;
2547
2548 /* 1x prefix + one read/write ccw per track */
2549 cplength = 1 + trkcount;
2550
2551 /* on 31-bit we need space for two 32 bit addresses per page
2552 * on 64-bit one 64 bit address
2553 */
2554 datasize = sizeof(struct PFX_eckd_data) +
2555 cidaw * sizeof(unsigned long long);
2556
2557 /* Allocate the ccw request. */
2558 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2559 startdev);
2560 if (IS_ERR(cqr))
2561 return cqr;
2562 ccw = cqr->cpaddr;
2563 /* transfer length factor: how many bytes to read from the last track */
2564 if (first_trk == last_trk)
2565 tlf = last_offs - first_offs + 1;
2566 else
2567 tlf = last_offs + 1;
2568 tlf *= blksize;
2569
2570 if (prefix_LRE(ccw++, cqr->data, first_trk,
2571 last_trk, cmd, basedev, startdev,
2572 1 /* format */, first_offs + 1,
2573 trkcount, blksize,
2574 tlf) == -EAGAIN) {
2575 /* Clock not in sync and XRC is enabled.
2576 * Try again later.
2577 */
2578 dasd_sfree_request(cqr, startdev);
2579 return ERR_PTR(-EAGAIN);
2580 }
2581
2582 /*
2583 * The translation of request into ccw programs must meet the
2584 * following conditions:
2585 * - all idaws but the first and the last must address full pages
2586 * (or 2K blocks on 31-bit)
2587 * - the scope of a ccw and it's idal ends with the track boundaries
2588 */
2589 idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2590 recid = first_rec;
2591 new_track = 1;
2592 end_idaw = 0;
2593 len_to_track_end = 0;
2594 idaw_dst = NULL;
2595 idaw_len = 0;
2596 rq_for_each_segment(bv, req, iter) {
2597 dst = page_address(bv->bv_page) + bv->bv_offset;
2598 seg_len = bv->bv_len;
2599 while (seg_len) {
2600 if (new_track) {
2601 trkid = recid;
2602 recoffs = sector_div(trkid, blk_per_trk);
2603 count_to_trk_end = blk_per_trk - recoffs;
2604 count = min((last_rec - recid + 1),
2605 (sector_t)count_to_trk_end);
2606 len_to_track_end = count * blksize;
2607 ccw[-1].flags |= CCW_FLAG_CC;
2608 ccw->cmd_code = cmd;
2609 ccw->count = len_to_track_end;
2610 ccw->cda = (__u32)(addr_t)idaws;
2611 ccw->flags = CCW_FLAG_IDA;
2612 ccw++;
2613 recid += count;
2614 new_track = 0;
2615 /* first idaw for a ccw may start anywhere */
2616 if (!idaw_dst)
2617 idaw_dst = dst;
2618 }
2619 /* If we start a new idaw, we must make sure that it
2620 * starts on an IDA_BLOCK_SIZE boundary.
2621 * If we continue an idaw, we must make sure that the
2622 * current segment begins where the so far accumulated
2623 * idaw ends
2624 */
2625 if (!idaw_dst) {
2626 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2627 dasd_sfree_request(cqr, startdev);
2628 return ERR_PTR(-ERANGE);
2629 } else
2630 idaw_dst = dst;
2631 }
2632 if ((idaw_dst + idaw_len) != dst) {
2633 dasd_sfree_request(cqr, startdev);
2634 return ERR_PTR(-ERANGE);
2635 }
2636 part_len = min(seg_len, len_to_track_end);
2637 seg_len -= part_len;
2638 dst += part_len;
2639 idaw_len += part_len;
2640 len_to_track_end -= part_len;
2641 /* collected memory area ends on an IDA_BLOCK border,
2642 * -> create an idaw
2643 * idal_create_words will handle cases where idaw_len
2644 * is larger then IDA_BLOCK_SIZE
2645 */
2646 if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2647 end_idaw = 1;
2648 /* We also need to end the idaw at track end */
2649 if (!len_to_track_end) {
2650 new_track = 1;
2651 end_idaw = 1;
2652 }
2653 if (end_idaw) {
2654 idaws = idal_create_words(idaws, idaw_dst,
2655 idaw_len);
2656 idaw_dst = NULL;
2657 idaw_len = 0;
2658 end_idaw = 0;
2659 }
2660 }
2661 }
2662
2663 if (blk_noretry_request(req) ||
2664 block->base->features & DASD_FEATURE_FAILFAST)
2665 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2666 cqr->startdev = startdev;
2667 cqr->memdev = startdev;
2668 cqr->block = block;
2669 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2670 cqr->lpm = startdev->path_data.ppm;
2671 cqr->retries = 256;
2672 cqr->buildclk = get_clock();
2673 cqr->status = DASD_CQR_FILLED;
2674 return cqr;
2675 }
2676
2677 static int prepare_itcw(struct itcw *itcw,
2678 unsigned int trk, unsigned int totrk, int cmd,
2679 struct dasd_device *basedev,
2680 struct dasd_device *startdev,
2681 unsigned int rec_on_trk, int count,
2682 unsigned int blksize,
2683 unsigned int total_data_size,
2684 unsigned int tlf,
2685 unsigned int blk_per_trk)
2686 {
2687 struct PFX_eckd_data pfxdata;
2688 struct dasd_eckd_private *basepriv, *startpriv;
2689 struct DE_eckd_data *dedata;
2690 struct LRE_eckd_data *lredata;
2691 struct dcw *dcw;
2692
2693 u32 begcyl, endcyl;
2694 u16 heads, beghead, endhead;
2695 u8 pfx_cmd;
2696
2697 int rc = 0;
2698 int sector = 0;
2699 int dn, d;
2700
2701
2702 /* setup prefix data */
2703 basepriv = (struct dasd_eckd_private *) basedev->private;
2704 startpriv = (struct dasd_eckd_private *) startdev->private;
2705 dedata = &pfxdata.define_extent;
2706 lredata = &pfxdata.locate_record;
2707
2708 memset(&pfxdata, 0, sizeof(pfxdata));
2709 pfxdata.format = 1; /* PFX with LRE */
2710 pfxdata.base_address = basepriv->ned->unit_addr;
2711 pfxdata.base_lss = basepriv->ned->ID;
2712 pfxdata.validity.define_extent = 1;
2713
2714 /* private uid is kept up to date, conf_data may be outdated */
2715 if (startpriv->uid.type != UA_BASE_DEVICE) {
2716 pfxdata.validity.verify_base = 1;
2717 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2718 pfxdata.validity.hyper_pav = 1;
2719 }
2720
2721 switch (cmd) {
2722 case DASD_ECKD_CCW_READ_TRACK_DATA:
2723 dedata->mask.perm = 0x1;
2724 dedata->attributes.operation = basepriv->attrib.operation;
2725 dedata->blk_size = blksize;
2726 dedata->ga_extended |= 0x42;
2727 lredata->operation.orientation = 0x0;
2728 lredata->operation.operation = 0x0C;
2729 lredata->auxiliary.check_bytes = 0x01;
2730 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2731 break;
2732 case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2733 dedata->mask.perm = 0x02;
2734 dedata->attributes.operation = basepriv->attrib.operation;
2735 dedata->blk_size = blksize;
2736 rc = check_XRC_on_prefix(&pfxdata, basedev);
2737 dedata->ga_extended |= 0x42;
2738 lredata->operation.orientation = 0x0;
2739 lredata->operation.operation = 0x3F;
2740 lredata->extended_operation = 0x23;
2741 lredata->auxiliary.check_bytes = 0x2;
2742 pfx_cmd = DASD_ECKD_CCW_PFX;
2743 break;
2744 default:
2745 DBF_DEV_EVENT(DBF_ERR, basedev,
2746 "prepare itcw, unknown opcode 0x%x", cmd);
2747 BUG();
2748 break;
2749 }
2750 if (rc)
2751 return rc;
2752
2753 dedata->attributes.mode = 0x3; /* ECKD */
2754
2755 heads = basepriv->rdc_data.trk_per_cyl;
2756 begcyl = trk / heads;
2757 beghead = trk % heads;
2758 endcyl = totrk / heads;
2759 endhead = totrk % heads;
2760
2761 /* check for sequential prestage - enhance cylinder range */
2762 if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2763 dedata->attributes.operation == DASD_SEQ_ACCESS) {
2764
2765 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2766 endcyl += basepriv->attrib.nr_cyl;
2767 else
2768 endcyl = (basepriv->real_cyl - 1);
2769 }
2770
2771 set_ch_t(&dedata->beg_ext, begcyl, beghead);
2772 set_ch_t(&dedata->end_ext, endcyl, endhead);
2773
2774 dedata->ep_format = 0x20; /* records per track is valid */
2775 dedata->ep_rec_per_track = blk_per_trk;
2776
2777 if (rec_on_trk) {
2778 switch (basepriv->rdc_data.dev_type) {
2779 case 0x3390:
2780 dn = ceil_quot(blksize + 6, 232);
2781 d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2782 sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2783 break;
2784 case 0x3380:
2785 d = 7 + ceil_quot(blksize + 12, 32);
2786 sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2787 break;
2788 }
2789 }
2790
2791 lredata->auxiliary.length_valid = 1;
2792 lredata->auxiliary.length_scope = 1;
2793 lredata->auxiliary.imbedded_ccw_valid = 1;
2794 lredata->length = tlf;
2795 lredata->imbedded_ccw = cmd;
2796 lredata->count = count;
2797 lredata->sector = sector;
2798 set_ch_t(&lredata->seek_addr, begcyl, beghead);
2799 lredata->search_arg.cyl = lredata->seek_addr.cyl;
2800 lredata->search_arg.head = lredata->seek_addr.head;
2801 lredata->search_arg.record = rec_on_trk;
2802
2803 dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2804 &pfxdata, sizeof(pfxdata), total_data_size);
2805 return IS_ERR(dcw) ? PTR_ERR(dcw) : 0;
2806 }
2807
2808 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2809 struct dasd_device *startdev,
2810 struct dasd_block *block,
2811 struct request *req,
2812 sector_t first_rec,
2813 sector_t last_rec,
2814 sector_t first_trk,
2815 sector_t last_trk,
2816 unsigned int first_offs,
2817 unsigned int last_offs,
2818 unsigned int blk_per_trk,
2819 unsigned int blksize)
2820 {
2821 struct dasd_ccw_req *cqr;
2822 struct req_iterator iter;
2823 struct bio_vec *bv;
2824 char *dst;
2825 unsigned int trkcount, ctidaw;
2826 unsigned char cmd;
2827 struct dasd_device *basedev;
2828 unsigned int tlf;
2829 struct itcw *itcw;
2830 struct tidaw *last_tidaw = NULL;
2831 int itcw_op;
2832 size_t itcw_size;
2833 u8 tidaw_flags;
2834 unsigned int seg_len, part_len, len_to_track_end;
2835 unsigned char new_track;
2836 sector_t recid, trkid;
2837 unsigned int offs;
2838 unsigned int count, count_to_trk_end;
2839
2840 basedev = block->base;
2841 if (rq_data_dir(req) == READ) {
2842 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2843 itcw_op = ITCW_OP_READ;
2844 } else if (rq_data_dir(req) == WRITE) {
2845 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2846 itcw_op = ITCW_OP_WRITE;
2847 } else
2848 return ERR_PTR(-EINVAL);
2849
2850 /* trackbased I/O needs address all memory via TIDAWs,
2851 * not just for 64 bit addresses. This allows us to map
2852 * each segment directly to one tidaw.
2853 * In the case of write requests, additional tidaws may
2854 * be needed when a segment crosses a track boundary.
2855 */
2856 trkcount = last_trk - first_trk + 1;
2857 ctidaw = 0;
2858 rq_for_each_segment(bv, req, iter) {
2859 ++ctidaw;
2860 }
2861 if (rq_data_dir(req) == WRITE)
2862 ctidaw += (last_trk - first_trk);
2863
2864 /* Allocate the ccw request. */
2865 itcw_size = itcw_calc_size(0, ctidaw, 0);
2866 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2867 if (IS_ERR(cqr))
2868 return cqr;
2869
2870 /* transfer length factor: how many bytes to read from the last track */
2871 if (first_trk == last_trk)
2872 tlf = last_offs - first_offs + 1;
2873 else
2874 tlf = last_offs + 1;
2875 tlf *= blksize;
2876
2877 itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2878 if (IS_ERR(itcw)) {
2879 dasd_sfree_request(cqr, startdev);
2880 return ERR_PTR(-EINVAL);
2881 }
2882 cqr->cpaddr = itcw_get_tcw(itcw);
2883 if (prepare_itcw(itcw, first_trk, last_trk,
2884 cmd, basedev, startdev,
2885 first_offs + 1,
2886 trkcount, blksize,
2887 (last_rec - first_rec + 1) * blksize,
2888 tlf, blk_per_trk) == -EAGAIN) {
2889 /* Clock not in sync and XRC is enabled.
2890 * Try again later.
2891 */
2892 dasd_sfree_request(cqr, startdev);
2893 return ERR_PTR(-EAGAIN);
2894 }
2895 len_to_track_end = 0;
2896 /*
2897 * A tidaw can address 4k of memory, but must not cross page boundaries
2898 * We can let the block layer handle this by setting
2899 * blk_queue_segment_boundary to page boundaries and
2900 * blk_max_segment_size to page size when setting up the request queue.
2901 * For write requests, a TIDAW must not cross track boundaries, because
2902 * we have to set the CBC flag on the last tidaw for each track.
2903 */
2904 if (rq_data_dir(req) == WRITE) {
2905 new_track = 1;
2906 recid = first_rec;
2907 rq_for_each_segment(bv, req, iter) {
2908 dst = page_address(bv->bv_page) + bv->bv_offset;
2909 seg_len = bv->bv_len;
2910 while (seg_len) {
2911 if (new_track) {
2912 trkid = recid;
2913 offs = sector_div(trkid, blk_per_trk);
2914 count_to_trk_end = blk_per_trk - offs;
2915 count = min((last_rec - recid + 1),
2916 (sector_t)count_to_trk_end);
2917 len_to_track_end = count * blksize;
2918 recid += count;
2919 new_track = 0;
2920 }
2921 part_len = min(seg_len, len_to_track_end);
2922 seg_len -= part_len;
2923 len_to_track_end -= part_len;
2924 /* We need to end the tidaw at track end */
2925 if (!len_to_track_end) {
2926 new_track = 1;
2927 tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
2928 } else
2929 tidaw_flags = 0;
2930 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
2931 dst, part_len);
2932 if (IS_ERR(last_tidaw))
2933 return ERR_PTR(-EINVAL);
2934 dst += part_len;
2935 }
2936 }
2937 } else {
2938 rq_for_each_segment(bv, req, iter) {
2939 dst = page_address(bv->bv_page) + bv->bv_offset;
2940 last_tidaw = itcw_add_tidaw(itcw, 0x00,
2941 dst, bv->bv_len);
2942 if (IS_ERR(last_tidaw))
2943 return ERR_PTR(-EINVAL);
2944 }
2945 }
2946 last_tidaw->flags |= TIDAW_FLAGS_LAST;
2947 last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
2948 itcw_finalize(itcw);
2949
2950 if (blk_noretry_request(req) ||
2951 block->base->features & DASD_FEATURE_FAILFAST)
2952 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2953 cqr->cpmode = 1;
2954 cqr->startdev = startdev;
2955 cqr->memdev = startdev;
2956 cqr->block = block;
2957 cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
2958 cqr->lpm = startdev->path_data.ppm;
2959 cqr->retries = 256;
2960 cqr->buildclk = get_clock();
2961 cqr->status = DASD_CQR_FILLED;
2962 return cqr;
2963 }
2964
2965 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2966 struct dasd_block *block,
2967 struct request *req)
2968 {
2969 int cmdrtd, cmdwtd;
2970 int use_prefix;
2971 int fcx_multitrack;
2972 struct dasd_eckd_private *private;
2973 struct dasd_device *basedev;
2974 sector_t first_rec, last_rec;
2975 sector_t first_trk, last_trk;
2976 unsigned int first_offs, last_offs;
2977 unsigned int blk_per_trk, blksize;
2978 int cdlspecial;
2979 unsigned int data_size;
2980 struct dasd_ccw_req *cqr;
2981
2982 basedev = block->base;
2983 private = (struct dasd_eckd_private *) basedev->private;
2984
2985 /* Calculate number of blocks/records per track. */
2986 blksize = block->bp_block;
2987 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2988 if (blk_per_trk == 0)
2989 return ERR_PTR(-EINVAL);
2990 /* Calculate record id of first and last block. */
2991 first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
2992 first_offs = sector_div(first_trk, blk_per_trk);
2993 last_rec = last_trk =
2994 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
2995 last_offs = sector_div(last_trk, blk_per_trk);
2996 cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2997
2998 fcx_multitrack = private->features.feature[40] & 0x20;
2999 data_size = blk_rq_bytes(req);
3000 /* tpm write request add CBC data on each track boundary */
3001 if (rq_data_dir(req) == WRITE)
3002 data_size += (last_trk - first_trk) * 4;
3003
3004 /* is read track data and write track data in command mode supported? */
3005 cmdrtd = private->features.feature[9] & 0x20;
3006 cmdwtd = private->features.feature[12] & 0x40;
3007 use_prefix = private->features.feature[8] & 0x01;
3008
3009 cqr = NULL;
3010 if (cdlspecial || dasd_page_cache) {
3011 /* do nothing, just fall through to the cmd mode single case */
3012 } else if ((data_size <= private->fcx_max_data)
3013 && (fcx_multitrack || (first_trk == last_trk))) {
3014 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3015 first_rec, last_rec,
3016 first_trk, last_trk,
3017 first_offs, last_offs,
3018 blk_per_trk, blksize);
3019 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3020 (PTR_ERR(cqr) != -ENOMEM))
3021 cqr = NULL;
3022 } else if (use_prefix &&
3023 (((rq_data_dir(req) == READ) && cmdrtd) ||
3024 ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3025 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3026 first_rec, last_rec,
3027 first_trk, last_trk,
3028 first_offs, last_offs,
3029 blk_per_trk, blksize);
3030 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3031 (PTR_ERR(cqr) != -ENOMEM))
3032 cqr = NULL;
3033 }
3034 if (!cqr)
3035 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3036 first_rec, last_rec,
3037 first_trk, last_trk,
3038 first_offs, last_offs,
3039 blk_per_trk, blksize);
3040 return cqr;
3041 }
3042
3043 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3044 struct dasd_block *block,
3045 struct request *req)
3046 {
3047 unsigned long *idaws;
3048 struct dasd_device *basedev;
3049 struct dasd_ccw_req *cqr;
3050 struct ccw1 *ccw;
3051 struct req_iterator iter;
3052 struct bio_vec *bv;
3053 char *dst;
3054 unsigned char cmd;
3055 unsigned int trkcount;
3056 unsigned int seg_len, len_to_track_end;
3057 unsigned int first_offs;
3058 unsigned int cidaw, cplength, datasize;
3059 sector_t first_trk, last_trk;
3060 unsigned int pfx_datasize;
3061
3062 /*
3063 * raw track access needs to be mutiple of 64k and on 64k boundary
3064 */
3065 if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
3066 cqr = ERR_PTR(-EINVAL);
3067 goto out;
3068 }
3069 if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
3070 DASD_RAW_SECTORS_PER_TRACK) != 0) {
3071 cqr = ERR_PTR(-EINVAL);
3072 goto out;
3073 }
3074
3075 first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3076 last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3077 DASD_RAW_SECTORS_PER_TRACK;
3078 trkcount = last_trk - first_trk + 1;
3079 first_offs = 0;
3080 basedev = block->base;
3081
3082 if (rq_data_dir(req) == READ)
3083 cmd = DASD_ECKD_CCW_READ_TRACK;
3084 else if (rq_data_dir(req) == WRITE)
3085 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3086 else {
3087 cqr = ERR_PTR(-EINVAL);
3088 goto out;
3089 }
3090
3091 /*
3092 * Raw track based I/O needs IDAWs for each page,
3093 * and not just for 64 bit addresses.
3094 */
3095 cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3096
3097 /* 1x prefix + one read/write ccw per track */
3098 cplength = 1 + trkcount;
3099
3100 /*
3101 * struct PFX_eckd_data has up to 2 byte as extended parameter
3102 * this is needed for write full track and has to be mentioned
3103 * separately
3104 * add 8 instead of 2 to keep 8 byte boundary
3105 */
3106 pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3107
3108 datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3109
3110 /* Allocate the ccw request. */
3111 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3112 datasize, startdev);
3113 if (IS_ERR(cqr))
3114 goto out;
3115 ccw = cqr->cpaddr;
3116
3117 if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3118 basedev, startdev, 1 /* format */, first_offs + 1,
3119 trkcount, 0, 0) == -EAGAIN) {
3120 /* Clock not in sync and XRC is enabled.
3121 * Try again later.
3122 */
3123 dasd_sfree_request(cqr, startdev);
3124 cqr = ERR_PTR(-EAGAIN);
3125 goto out;
3126 }
3127
3128 idaws = (unsigned long *)(cqr->data + pfx_datasize);
3129
3130 len_to_track_end = 0;
3131
3132 rq_for_each_segment(bv, req, iter) {
3133 dst = page_address(bv->bv_page) + bv->bv_offset;
3134 seg_len = bv->bv_len;
3135 if (!len_to_track_end) {
3136 ccw[-1].flags |= CCW_FLAG_CC;
3137 ccw->cmd_code = cmd;
3138 /* maximum 3390 track size */
3139 ccw->count = 57326;
3140 /* 64k map to one track */
3141 len_to_track_end = 65536;
3142 ccw->cda = (__u32)(addr_t)idaws;
3143 ccw->flags |= CCW_FLAG_IDA;
3144 ccw->flags |= CCW_FLAG_SLI;
3145 ccw++;
3146 }
3147 len_to_track_end -= seg_len;
3148 idaws = idal_create_words(idaws, dst, seg_len);
3149 }
3150
3151 if (blk_noretry_request(req) ||
3152 block->base->features & DASD_FEATURE_FAILFAST)
3153 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3154 cqr->startdev = startdev;
3155 cqr->memdev = startdev;
3156 cqr->block = block;
3157 cqr->expires = startdev->default_expires * HZ;
3158 cqr->lpm = startdev->path_data.ppm;
3159 cqr->retries = 256;
3160 cqr->buildclk = get_clock();
3161 cqr->status = DASD_CQR_FILLED;
3162
3163 if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3164 cqr = NULL;
3165 out:
3166 return cqr;
3167 }
3168
3169
3170 static int
3171 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3172 {
3173 struct dasd_eckd_private *private;
3174 struct ccw1 *ccw;
3175 struct req_iterator iter;
3176 struct bio_vec *bv;
3177 char *dst, *cda;
3178 unsigned int blksize, blk_per_trk, off;
3179 sector_t recid;
3180 int status;
3181
3182 if (!dasd_page_cache)
3183 goto out;
3184 private = (struct dasd_eckd_private *) cqr->block->base->private;
3185 blksize = cqr->block->bp_block;
3186 blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3187 recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3188 ccw = cqr->cpaddr;
3189 /* Skip over define extent & locate record. */
3190 ccw++;
3191 if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3192 ccw++;
3193 rq_for_each_segment(bv, req, iter) {
3194 dst = page_address(bv->bv_page) + bv->bv_offset;
3195 for (off = 0; off < bv->bv_len; off += blksize) {
3196 /* Skip locate record. */
3197 if (private->uses_cdl && recid <= 2*blk_per_trk)
3198 ccw++;
3199 if (dst) {
3200 if (ccw->flags & CCW_FLAG_IDA)
3201 cda = *((char **)((addr_t) ccw->cda));
3202 else
3203 cda = (char *)((addr_t) ccw->cda);
3204 if (dst != cda) {
3205 if (rq_data_dir(req) == READ)
3206 memcpy(dst, cda, bv->bv_len);
3207 kmem_cache_free(dasd_page_cache,
3208 (void *)((addr_t)cda & PAGE_MASK));
3209 }
3210 dst = NULL;
3211 }
3212 ccw++;
3213 recid++;
3214 }
3215 }
3216 out:
3217 status = cqr->status == DASD_CQR_DONE;
3218 dasd_sfree_request(cqr, cqr->memdev);
3219 return status;
3220 }
3221
3222 /*
3223 * Modify ccw/tcw in cqr so it can be started on a base device.
3224 *
3225 * Note that this is not enough to restart the cqr!
3226 * Either reset cqr->startdev as well (summary unit check handling)
3227 * or restart via separate cqr (as in ERP handling).
3228 */
3229 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3230 {
3231 struct ccw1 *ccw;
3232 struct PFX_eckd_data *pfxdata;
3233 struct tcw *tcw;
3234 struct tccb *tccb;
3235 struct dcw *dcw;
3236
3237 if (cqr->cpmode == 1) {
3238 tcw = cqr->cpaddr;
3239 tccb = tcw_get_tccb(tcw);
3240 dcw = (struct dcw *)&tccb->tca[0];
3241 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3242 pfxdata->validity.verify_base = 0;
3243 pfxdata->validity.hyper_pav = 0;
3244 } else {
3245 ccw = cqr->cpaddr;
3246 pfxdata = cqr->data;
3247 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3248 pfxdata->validity.verify_base = 0;
3249 pfxdata->validity.hyper_pav = 0;
3250 }
3251 }
3252 }
3253
3254 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3255
3256 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3257 struct dasd_block *block,
3258 struct request *req)
3259 {
3260 struct dasd_eckd_private *private;
3261 struct dasd_device *startdev;
3262 unsigned long flags;
3263 struct dasd_ccw_req *cqr;
3264
3265 startdev = dasd_alias_get_start_dev(base);
3266 if (!startdev)
3267 startdev = base;
3268 private = (struct dasd_eckd_private *) startdev->private;
3269 if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3270 return ERR_PTR(-EBUSY);
3271
3272 spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3273 private->count++;
3274 if ((base->features & DASD_FEATURE_USERAW))
3275 cqr = dasd_raw_build_cp(startdev, block, req);
3276 else
3277 cqr = dasd_eckd_build_cp(startdev, block, req);
3278 if (IS_ERR(cqr))
3279 private->count--;
3280 spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3281 return cqr;
3282 }
3283
3284 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3285 struct request *req)
3286 {
3287 struct dasd_eckd_private *private;
3288 unsigned long flags;
3289
3290 spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3291 private = (struct dasd_eckd_private *) cqr->memdev->private;
3292 private->count--;
3293 spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3294 return dasd_eckd_free_cp(cqr, req);
3295 }
3296
3297 static int
3298 dasd_eckd_fill_info(struct dasd_device * device,
3299 struct dasd_information2_t * info)
3300 {
3301 struct dasd_eckd_private *private;
3302
3303 private = (struct dasd_eckd_private *) device->private;
3304 info->label_block = 2;
3305 info->FBA_layout = private->uses_cdl ? 0 : 1;
3306 info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3307 info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3308 memcpy(info->characteristics, &private->rdc_data,
3309 sizeof(struct dasd_eckd_characteristics));
3310 info->confdata_size = min((unsigned long)private->conf_len,
3311 sizeof(info->configuration_data));
3312 memcpy(info->configuration_data, private->conf_data,
3313 info->confdata_size);
3314 return 0;
3315 }
3316
3317 /*
3318 * SECTION: ioctl functions for eckd devices.
3319 */
3320
3321 /*
3322 * Release device ioctl.
3323 * Buils a channel programm to releases a prior reserved
3324 * (see dasd_eckd_reserve) device.
3325 */
3326 static int
3327 dasd_eckd_release(struct dasd_device *device)
3328 {
3329 struct dasd_ccw_req *cqr;
3330 int rc;
3331 struct ccw1 *ccw;
3332 int useglobal;
3333
3334 if (!capable(CAP_SYS_ADMIN))
3335 return -EACCES;
3336
3337 useglobal = 0;
3338 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3339 if (IS_ERR(cqr)) {
3340 mutex_lock(&dasd_reserve_mutex);
3341 useglobal = 1;
3342 cqr = &dasd_reserve_req->cqr;
3343 memset(cqr, 0, sizeof(*cqr));
3344 memset(&dasd_reserve_req->ccw, 0,
3345 sizeof(dasd_reserve_req->ccw));
3346 cqr->cpaddr = &dasd_reserve_req->ccw;
3347 cqr->data = &dasd_reserve_req->data;
3348 cqr->magic = DASD_ECKD_MAGIC;
3349 }
3350 ccw = cqr->cpaddr;
3351 ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3352 ccw->flags |= CCW_FLAG_SLI;
3353 ccw->count = 32;
3354 ccw->cda = (__u32)(addr_t) cqr->data;
3355 cqr->startdev = device;
3356 cqr->memdev = device;
3357 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3358 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3359 cqr->retries = 2; /* set retry counter to enable basic ERP */
3360 cqr->expires = 2 * HZ;
3361 cqr->buildclk = get_clock();
3362 cqr->status = DASD_CQR_FILLED;
3363
3364 rc = dasd_sleep_on_immediatly(cqr);
3365 if (!rc)
3366 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3367
3368 if (useglobal)
3369 mutex_unlock(&dasd_reserve_mutex);
3370 else
3371 dasd_sfree_request(cqr, cqr->memdev);
3372 return rc;
3373 }
3374
3375 /*
3376 * Reserve device ioctl.
3377 * Options are set to 'synchronous wait for interrupt' and
3378 * 'timeout the request'. This leads to a terminate IO if
3379 * the interrupt is outstanding for a certain time.
3380 */
3381 static int
3382 dasd_eckd_reserve(struct dasd_device *device)
3383 {
3384 struct dasd_ccw_req *cqr;
3385 int rc;
3386 struct ccw1 *ccw;
3387 int useglobal;
3388
3389 if (!capable(CAP_SYS_ADMIN))
3390 return -EACCES;
3391
3392 useglobal = 0;
3393 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3394 if (IS_ERR(cqr)) {
3395 mutex_lock(&dasd_reserve_mutex);
3396 useglobal = 1;
3397 cqr = &dasd_reserve_req->cqr;
3398 memset(cqr, 0, sizeof(*cqr));
3399 memset(&dasd_reserve_req->ccw, 0,
3400 sizeof(dasd_reserve_req->ccw));
3401 cqr->cpaddr = &dasd_reserve_req->ccw;
3402 cqr->data = &dasd_reserve_req->data;
3403 cqr->magic = DASD_ECKD_MAGIC;
3404 }
3405 ccw = cqr->cpaddr;
3406 ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3407 ccw->flags |= CCW_FLAG_SLI;
3408 ccw->count = 32;
3409 ccw->cda = (__u32)(addr_t) cqr->data;
3410 cqr->startdev = device;
3411 cqr->memdev = device;
3412 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3413 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3414 cqr->retries = 2; /* set retry counter to enable basic ERP */
3415 cqr->expires = 2 * HZ;
3416 cqr->buildclk = get_clock();
3417 cqr->status = DASD_CQR_FILLED;
3418
3419 rc = dasd_sleep_on_immediatly(cqr);
3420 if (!rc)
3421 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3422
3423 if (useglobal)
3424 mutex_unlock(&dasd_reserve_mutex);
3425 else
3426 dasd_sfree_request(cqr, cqr->memdev);
3427 return rc;
3428 }
3429
3430 /*
3431 * Steal lock ioctl - unconditional reserve device.
3432 * Buils a channel programm to break a device's reservation.
3433 * (unconditional reserve)
3434 */
3435 static int
3436 dasd_eckd_steal_lock(struct dasd_device *device)
3437 {
3438 struct dasd_ccw_req *cqr;
3439 int rc;
3440 struct ccw1 *ccw;
3441 int useglobal;
3442
3443 if (!capable(CAP_SYS_ADMIN))
3444 return -EACCES;
3445
3446 useglobal = 0;
3447 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3448 if (IS_ERR(cqr)) {
3449 mutex_lock(&dasd_reserve_mutex);
3450 useglobal = 1;
3451 cqr = &dasd_reserve_req->cqr;
3452 memset(cqr, 0, sizeof(*cqr));
3453 memset(&dasd_reserve_req->ccw, 0,
3454 sizeof(dasd_reserve_req->ccw));
3455 cqr->cpaddr = &dasd_reserve_req->ccw;
3456 cqr->data = &dasd_reserve_req->data;
3457 cqr->magic = DASD_ECKD_MAGIC;
3458 }
3459 ccw = cqr->cpaddr;
3460 ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3461 ccw->flags |= CCW_FLAG_SLI;
3462 ccw->count = 32;
3463 ccw->cda = (__u32)(addr_t) cqr->data;
3464 cqr->startdev = device;
3465 cqr->memdev = device;
3466 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3467 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3468 cqr->retries = 2; /* set retry counter to enable basic ERP */
3469 cqr->expires = 2 * HZ;
3470 cqr->buildclk = get_clock();
3471 cqr->status = DASD_CQR_FILLED;
3472
3473 rc = dasd_sleep_on_immediatly(cqr);
3474 if (!rc)
3475 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3476
3477 if (useglobal)
3478 mutex_unlock(&dasd_reserve_mutex);
3479 else
3480 dasd_sfree_request(cqr, cqr->memdev);
3481 return rc;
3482 }
3483
3484 /*
3485 * SNID - Sense Path Group ID
3486 * This ioctl may be used in situations where I/O is stalled due to
3487 * a reserve, so if the normal dasd_smalloc_request fails, we use the
3488 * preallocated dasd_reserve_req.
3489 */
3490 static int dasd_eckd_snid(struct dasd_device *device,
3491 void __user *argp)
3492 {
3493 struct dasd_ccw_req *cqr;
3494 int rc;
3495 struct ccw1 *ccw;
3496 int useglobal;
3497 struct dasd_snid_ioctl_data usrparm;
3498
3499 if (!capable(CAP_SYS_ADMIN))
3500 return -EACCES;
3501
3502 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3503 return -EFAULT;
3504
3505 useglobal = 0;
3506 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3507 sizeof(struct dasd_snid_data), device);
3508 if (IS_ERR(cqr)) {
3509 mutex_lock(&dasd_reserve_mutex);
3510 useglobal = 1;
3511 cqr = &dasd_reserve_req->cqr;
3512 memset(cqr, 0, sizeof(*cqr));
3513 memset(&dasd_reserve_req->ccw, 0,
3514 sizeof(dasd_reserve_req->ccw));
3515 cqr->cpaddr = &dasd_reserve_req->ccw;
3516 cqr->data = &dasd_reserve_req->data;
3517 cqr->magic = DASD_ECKD_MAGIC;
3518 }
3519 ccw = cqr->cpaddr;
3520 ccw->cmd_code = DASD_ECKD_CCW_SNID;
3521 ccw->flags |= CCW_FLAG_SLI;
3522 ccw->count = 12;
3523 ccw->cda = (__u32)(addr_t) cqr->data;
3524 cqr->startdev = device;
3525 cqr->memdev = device;
3526 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3527 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3528 set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3529 cqr->retries = 5;
3530 cqr->expires = 10 * HZ;
3531 cqr->buildclk = get_clock();
3532 cqr->status = DASD_CQR_FILLED;
3533 cqr->lpm = usrparm.path_mask;
3534
3535 rc = dasd_sleep_on_immediatly(cqr);
3536 /* verify that I/O processing didn't modify the path mask */
3537 if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3538 rc = -EIO;
3539 if (!rc) {
3540 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3541 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3542 rc = -EFAULT;
3543 }
3544
3545 if (useglobal)
3546 mutex_unlock(&dasd_reserve_mutex);
3547 else
3548 dasd_sfree_request(cqr, cqr->memdev);
3549 return rc;
3550 }
3551
3552 /*
3553 * Read performance statistics
3554 */
3555 static int
3556 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3557 {
3558 struct dasd_psf_prssd_data *prssdp;
3559 struct dasd_rssd_perf_stats_t *stats;
3560 struct dasd_ccw_req *cqr;
3561 struct ccw1 *ccw;
3562 int rc;
3563
3564 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
3565 (sizeof(struct dasd_psf_prssd_data) +
3566 sizeof(struct dasd_rssd_perf_stats_t)),
3567 device);
3568 if (IS_ERR(cqr)) {
3569 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3570 "Could not allocate initialization request");
3571 return PTR_ERR(cqr);
3572 }
3573 cqr->startdev = device;
3574 cqr->memdev = device;
3575 cqr->retries = 0;
3576 clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3577 cqr->expires = 10 * HZ;
3578
3579 /* Prepare for Read Subsystem Data */
3580 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3581 memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3582 prssdp->order = PSF_ORDER_PRSSD;
3583 prssdp->suborder = 0x01; /* Performance Statistics */
3584 prssdp->varies[1] = 0x01; /* Perf Statistics for the Subsystem */
3585
3586 ccw = cqr->cpaddr;
3587 ccw->cmd_code = DASD_ECKD_CCW_PSF;
3588 ccw->count = sizeof(struct dasd_psf_prssd_data);
3589 ccw->flags |= CCW_FLAG_CC;
3590 ccw->cda = (__u32)(addr_t) prssdp;
3591
3592 /* Read Subsystem Data - Performance Statistics */
3593 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3594 memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3595
3596 ccw++;
3597 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3598 ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3599 ccw->cda = (__u32)(addr_t) stats;
3600
3601 cqr->buildclk = get_clock();
3602 cqr->status = DASD_CQR_FILLED;
3603 rc = dasd_sleep_on(cqr);
3604 if (rc == 0) {
3605 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3606 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3607 if (copy_to_user(argp, stats,
3608 sizeof(struct dasd_rssd_perf_stats_t)))
3609 rc = -EFAULT;
3610 }
3611 dasd_sfree_request(cqr, cqr->memdev);
3612 return rc;
3613 }
3614
3615 /*
3616 * Get attributes (cache operations)
3617 * Returnes the cache attributes used in Define Extend (DE).
3618 */
3619 static int
3620 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3621 {
3622 struct dasd_eckd_private *private =
3623 (struct dasd_eckd_private *)device->private;
3624 struct attrib_data_t attrib = private->attrib;
3625 int rc;
3626
3627 if (!capable(CAP_SYS_ADMIN))
3628 return -EACCES;
3629 if (!argp)
3630 return -EINVAL;
3631
3632 rc = 0;
3633 if (copy_to_user(argp, (long *) &attrib,
3634 sizeof(struct attrib_data_t)))
3635 rc = -EFAULT;
3636
3637 return rc;
3638 }
3639
3640 /*
3641 * Set attributes (cache operations)
3642 * Stores the attributes for cache operation to be used in Define Extend (DE).
3643 */
3644 static int
3645 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3646 {
3647 struct dasd_eckd_private *private =
3648 (struct dasd_eckd_private *)device->private;
3649 struct attrib_data_t attrib;
3650
3651 if (!capable(CAP_SYS_ADMIN))
3652 return -EACCES;
3653 if (!argp)
3654 return -EINVAL;
3655
3656 if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3657 return -EFAULT;
3658 private->attrib = attrib;
3659
3660 dev_info(&device->cdev->dev,
3661 "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3662 private->attrib.operation, private->attrib.nr_cyl);
3663 return 0;
3664 }
3665
3666 /*
3667 * Issue syscall I/O to EMC Symmetrix array.
3668 * CCWs are PSF and RSSD
3669 */
3670 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3671 {
3672 struct dasd_symmio_parms usrparm;
3673 char *psf_data, *rssd_result;
3674 struct dasd_ccw_req *cqr;
3675 struct ccw1 *ccw;
3676 char psf0, psf1;
3677 int rc;
3678
3679 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3680 return -EACCES;
3681 psf0 = psf1 = 0;
3682
3683 /* Copy parms from caller */
3684 rc = -EFAULT;
3685 if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3686 goto out;
3687 if (is_compat_task() || sizeof(long) == 4) {
3688 /* Make sure pointers are sane even on 31 bit. */
3689 rc = -EINVAL;
3690 if ((usrparm.psf_data >> 32) != 0)
3691 goto out;
3692 if ((usrparm.rssd_result >> 32) != 0)
3693 goto out;
3694 usrparm.psf_data &= 0x7fffffffULL;
3695 usrparm.rssd_result &= 0x7fffffffULL;
3696 }
3697 /* alloc I/O data area */
3698 psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3699 rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3700 if (!psf_data || !rssd_result) {
3701 rc = -ENOMEM;
3702 goto out_free;
3703 }
3704
3705 /* get syscall header from user space */
3706 rc = -EFAULT;
3707 if (copy_from_user(psf_data,
3708 (void __user *)(unsigned long) usrparm.psf_data,
3709 usrparm.psf_data_len))
3710 goto out_free;
3711 psf0 = psf_data[0];
3712 psf1 = psf_data[1];
3713
3714 /* setup CCWs for PSF + RSSD */
3715 cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3716 if (IS_ERR(cqr)) {
3717 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3718 "Could not allocate initialization request");
3719 rc = PTR_ERR(cqr);
3720 goto out_free;
3721 }
3722
3723 cqr->startdev = device;
3724 cqr->memdev = device;
3725 cqr->retries = 3;
3726 cqr->expires = 10 * HZ;
3727 cqr->buildclk = get_clock();
3728 cqr->status = DASD_CQR_FILLED;
3729
3730 /* Build the ccws */
3731 ccw = cqr->cpaddr;
3732
3733 /* PSF ccw */
3734 ccw->cmd_code = DASD_ECKD_CCW_PSF;
3735 ccw->count = usrparm.psf_data_len;
3736 ccw->flags |= CCW_FLAG_CC;
3737 ccw->cda = (__u32)(addr_t) psf_data;
3738
3739 ccw++;
3740
3741 /* RSSD ccw */
3742 ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3743 ccw->count = usrparm.rssd_result_len;
3744 ccw->flags = CCW_FLAG_SLI ;
3745 ccw->cda = (__u32)(addr_t) rssd_result;
3746
3747 rc = dasd_sleep_on(cqr);
3748 if (rc)
3749 goto out_sfree;
3750
3751 rc = -EFAULT;
3752 if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3753 rssd_result, usrparm.rssd_result_len))
3754 goto out_sfree;
3755 rc = 0;
3756
3757 out_sfree:
3758 dasd_sfree_request(cqr, cqr->memdev);
3759 out_free:
3760 kfree(rssd_result);
3761 kfree(psf_data);
3762 out:
3763 DBF_DEV_EVENT(DBF_WARNING, device,
3764 "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3765 (int) psf0, (int) psf1, rc);
3766 return rc;
3767 }
3768
3769 static int
3770 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3771 {
3772 struct dasd_device *device = block->base;
3773
3774 switch (cmd) {
3775 case BIODASDGATTR:
3776 return dasd_eckd_get_attrib(device, argp);
3777 case BIODASDSATTR:
3778 return dasd_eckd_set_attrib(device, argp);
3779 case BIODASDPSRD:
3780 return dasd_eckd_performance(device, argp);
3781 case BIODASDRLSE:
3782 return dasd_eckd_release(device);
3783 case BIODASDRSRV:
3784 return dasd_eckd_reserve(device);
3785 case BIODASDSLCK:
3786 return dasd_eckd_steal_lock(device);
3787 case BIODASDSNID:
3788 return dasd_eckd_snid(device, argp);
3789 case BIODASDSYMMIO:
3790 return dasd_symm_io(device, argp);
3791 default:
3792 return -ENOIOCTLCMD;
3793 }
3794 }
3795
3796 /*
3797 * Dump the range of CCWs into 'page' buffer
3798 * and return number of printed chars.
3799 */
3800 static int
3801 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
3802 {
3803 int len, count;
3804 char *datap;
3805
3806 len = 0;
3807 while (from <= to) {
3808 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3809 " CCW %p: %08X %08X DAT:",
3810 from, ((int *) from)[0], ((int *) from)[1]);
3811
3812 /* get pointer to data (consider IDALs) */
3813 if (from->flags & CCW_FLAG_IDA)
3814 datap = (char *) *((addr_t *) (addr_t) from->cda);
3815 else
3816 datap = (char *) ((addr_t) from->cda);
3817
3818 /* dump data (max 32 bytes) */
3819 for (count = 0; count < from->count && count < 32; count++) {
3820 if (count % 8 == 0) len += sprintf(page + len, " ");
3821 if (count % 4 == 0) len += sprintf(page + len, " ");
3822 len += sprintf(page + len, "%02x", datap[count]);
3823 }
3824 len += sprintf(page + len, "\n");
3825 from++;
3826 }
3827 return len;
3828 }
3829
3830 static void
3831 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
3832 char *reason)
3833 {
3834 u64 *sense;
3835 u64 *stat;
3836
3837 sense = (u64 *) dasd_get_sense(irb);
3838 stat = (u64 *) &irb->scsw;
3839 if (sense) {
3840 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
3841 "%016llx %016llx %016llx %016llx",
3842 reason, *stat, *((u32 *) (stat + 1)),
3843 sense[0], sense[1], sense[2], sense[3]);
3844 } else {
3845 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
3846 reason, *stat, *((u32 *) (stat + 1)),
3847 "NO VALID SENSE");
3848 }
3849 }
3850
3851 /*
3852 * Print sense data and related channel program.
3853 * Parts are printed because printk buffer is only 1024 bytes.
3854 */
3855 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3856 struct dasd_ccw_req *req, struct irb *irb)
3857 {
3858 char *page;
3859 struct ccw1 *first, *last, *fail, *from, *to;
3860 int len, sl, sct;
3861
3862 page = (char *) get_zeroed_page(GFP_ATOMIC);
3863 if (page == NULL) {
3864 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3865 "No memory to dump sense data\n");
3866 return;
3867 }
3868 /* dump the sense data */
3869 len = sprintf(page, KERN_ERR PRINTK_HEADER
3870 " I/O status report for device %s:\n",
3871 dev_name(&device->cdev->dev));
3872 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3873 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3874 "CS:%02X RC:%d\n",
3875 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3876 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3877 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3878 req ? req->intrc : 0);
3879 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3880 " device %s: Failing CCW: %p\n",
3881 dev_name(&device->cdev->dev),
3882 (void *) (addr_t) irb->scsw.cmd.cpa);
3883 if (irb->esw.esw0.erw.cons) {
3884 for (sl = 0; sl < 4; sl++) {
3885 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3886 " Sense(hex) %2d-%2d:",
3887 (8 * sl), ((8 * sl) + 7));
3888
3889 for (sct = 0; sct < 8; sct++) {
3890 len += sprintf(page + len, " %02x",
3891 irb->ecw[8 * sl + sct]);
3892 }
3893 len += sprintf(page + len, "\n");
3894 }
3895
3896 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3897 /* 24 Byte Sense Data */
3898 sprintf(page + len, KERN_ERR PRINTK_HEADER
3899 " 24 Byte: %x MSG %x, "
3900 "%s MSGb to SYSOP\n",
3901 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3902 irb->ecw[1] & 0x10 ? "" : "no");
3903 } else {
3904 /* 32 Byte Sense Data */
3905 sprintf(page + len, KERN_ERR PRINTK_HEADER
3906 " 32 Byte: Format: %x "
3907 "Exception class %x\n",
3908 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3909 }
3910 } else {
3911 sprintf(page + len, KERN_ERR PRINTK_HEADER
3912 " SORRY - NO VALID SENSE AVAILABLE\n");
3913 }
3914 printk("%s", page);
3915
3916 if (req) {
3917 /* req == NULL for unsolicited interrupts */
3918 /* dump the Channel Program (max 140 Bytes per line) */
3919 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3920 first = req->cpaddr;
3921 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3922 to = min(first + 6, last);
3923 len = sprintf(page, KERN_ERR PRINTK_HEADER
3924 " Related CP in req: %p\n", req);
3925 dasd_eckd_dump_ccw_range(first, to, page + len);
3926 printk("%s", page);
3927
3928 /* print failing CCW area (maximum 4) */
3929 /* scsw->cda is either valid or zero */
3930 len = 0;
3931 from = ++to;
3932 fail = (struct ccw1 *)(addr_t)
3933 irb->scsw.cmd.cpa; /* failing CCW */
3934 if (from < fail - 2) {
3935 from = fail - 2; /* there is a gap - print header */
3936 len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3937 }
3938 to = min(fail + 1, last);
3939 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3940
3941 /* print last CCWs (maximum 2) */
3942 from = max(from, ++to);
3943 if (from < last - 1) {
3944 from = last - 1; /* there is a gap - print header */
3945 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3946 }
3947 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3948 if (len > 0)
3949 printk("%s", page);
3950 }
3951 free_page((unsigned long) page);
3952 }
3953
3954
3955 /*
3956 * Print sense data from a tcw.
3957 */
3958 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3959 struct dasd_ccw_req *req, struct irb *irb)
3960 {
3961 char *page;
3962 int len, sl, sct, residual;
3963 struct tsb *tsb;
3964 u8 *sense, *rcq;
3965
3966 page = (char *) get_zeroed_page(GFP_ATOMIC);
3967 if (page == NULL) {
3968 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3969 "No memory to dump sense data");
3970 return;
3971 }
3972 /* dump the sense data */
3973 len = sprintf(page, KERN_ERR PRINTK_HEADER
3974 " I/O status report for device %s:\n",
3975 dev_name(&device->cdev->dev));
3976 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3977 " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3978 "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
3979 req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3980 scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3981 scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3982 irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
3983 req ? req->intrc : 0);
3984 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3985 " device %s: Failing TCW: %p\n",
3986 dev_name(&device->cdev->dev),
3987 (void *) (addr_t) irb->scsw.tm.tcw);
3988
3989 tsb = NULL;
3990 sense = NULL;
3991 if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
3992 tsb = tcw_get_tsb(
3993 (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3994
3995 if (tsb) {
3996 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3997 " tsb->length %d\n", tsb->length);
3998 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3999 " tsb->flags %x\n", tsb->flags);
4000 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4001 " tsb->dcw_offset %d\n", tsb->dcw_offset);
4002 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4003 " tsb->count %d\n", tsb->count);
4004 residual = tsb->count - 28;
4005 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4006 " residual %d\n", residual);
4007
4008 switch (tsb->flags & 0x07) {
4009 case 1: /* tsa_iostat */
4010 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4011 " tsb->tsa.iostat.dev_time %d\n",
4012 tsb->tsa.iostat.dev_time);
4013 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4014 " tsb->tsa.iostat.def_time %d\n",
4015 tsb->tsa.iostat.def_time);
4016 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4017 " tsb->tsa.iostat.queue_time %d\n",
4018 tsb->tsa.iostat.queue_time);
4019 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4020 " tsb->tsa.iostat.dev_busy_time %d\n",
4021 tsb->tsa.iostat.dev_busy_time);
4022 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4023 " tsb->tsa.iostat.dev_act_time %d\n",
4024 tsb->tsa.iostat.dev_act_time);
4025 sense = tsb->tsa.iostat.sense;
4026 break;
4027 case 2: /* ts_ddpc */
4028 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4029 " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4030 for (sl = 0; sl < 2; sl++) {
4031 len += sprintf(page + len,
4032 KERN_ERR PRINTK_HEADER
4033 " tsb->tsa.ddpc.rcq %2d-%2d: ",
4034 (8 * sl), ((8 * sl) + 7));
4035 rcq = tsb->tsa.ddpc.rcq;
4036 for (sct = 0; sct < 8; sct++) {
4037 len += sprintf(page + len, " %02x",
4038 rcq[8 * sl + sct]);
4039 }
4040 len += sprintf(page + len, "\n");
4041 }
4042 sense = tsb->tsa.ddpc.sense;
4043 break;
4044 case 3: /* tsa_intrg */
4045 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4046 " tsb->tsa.intrg.: not supportet yet \n");
4047 break;
4048 }
4049
4050 if (sense) {
4051 for (sl = 0; sl < 4; sl++) {
4052 len += sprintf(page + len,
4053 KERN_ERR PRINTK_HEADER
4054 " Sense(hex) %2d-%2d:",
4055 (8 * sl), ((8 * sl) + 7));
4056 for (sct = 0; sct < 8; sct++) {
4057 len += sprintf(page + len, " %02x",
4058 sense[8 * sl + sct]);
4059 }
4060 len += sprintf(page + len, "\n");
4061 }
4062
4063 if (sense[27] & DASD_SENSE_BIT_0) {
4064 /* 24 Byte Sense Data */
4065 sprintf(page + len, KERN_ERR PRINTK_HEADER
4066 " 24 Byte: %x MSG %x, "
4067 "%s MSGb to SYSOP\n",
4068 sense[7] >> 4, sense[7] & 0x0f,
4069 sense[1] & 0x10 ? "" : "no");
4070 } else {
4071 /* 32 Byte Sense Data */
4072 sprintf(page + len, KERN_ERR PRINTK_HEADER
4073 " 32 Byte: Format: %x "
4074 "Exception class %x\n",
4075 sense[6] & 0x0f, sense[22] >> 4);
4076 }
4077 } else {
4078 sprintf(page + len, KERN_ERR PRINTK_HEADER
4079 " SORRY - NO VALID SENSE AVAILABLE\n");
4080 }
4081 } else {
4082 sprintf(page + len, KERN_ERR PRINTK_HEADER
4083 " SORRY - NO TSB DATA AVAILABLE\n");
4084 }
4085 printk("%s", page);
4086 free_page((unsigned long) page);
4087 }
4088
4089 static void dasd_eckd_dump_sense(struct dasd_device *device,
4090 struct dasd_ccw_req *req, struct irb *irb)
4091 {
4092 if (scsw_is_tm(&irb->scsw))
4093 dasd_eckd_dump_sense_tcw(device, req, irb);
4094 else
4095 dasd_eckd_dump_sense_ccw(device, req, irb);
4096 }
4097
4098 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4099 {
4100 /*
4101 * the device should be disconnected from our LCU structure
4102 * on restore we will reconnect it and reread LCU specific
4103 * information like PAV support that might have changed
4104 */
4105 dasd_alias_remove_device(device);
4106 dasd_alias_disconnect_device_from_lcu(device);
4107
4108 return 0;
4109 }
4110
4111 static int dasd_eckd_restore_device(struct dasd_device *device)
4112 {
4113 struct dasd_eckd_private *private;
4114 struct dasd_eckd_characteristics temp_rdc_data;
4115 int rc;
4116 struct dasd_uid temp_uid;
4117 unsigned long flags;
4118
4119 private = (struct dasd_eckd_private *) device->private;
4120
4121 /* Read Configuration Data */
4122 rc = dasd_eckd_read_conf(device);
4123 if (rc)
4124 goto out_err;
4125
4126 dasd_eckd_get_uid(device, &temp_uid);
4127 /* Generate device unique id */
4128 rc = dasd_eckd_generate_uid(device);
4129 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4130 if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4131 dev_err(&device->cdev->dev, "The UID of the DASD has "
4132 "changed\n");
4133 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4134 if (rc)
4135 goto out_err;
4136
4137 /* register lcu with alias handling, enable PAV if this is a new lcu */
4138 rc = dasd_alias_make_device_known_to_lcu(device);
4139 if (rc)
4140 return rc;
4141 dasd_eckd_validate_server(device);
4142
4143 /* RE-Read Configuration Data */
4144 rc = dasd_eckd_read_conf(device);
4145 if (rc)
4146 goto out_err;
4147
4148 /* Read Feature Codes */
4149 dasd_eckd_read_features(device);
4150
4151 /* Read Device Characteristics */
4152 rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4153 &temp_rdc_data, 64);
4154 if (rc) {
4155 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4156 "Read device characteristic failed, rc=%d", rc);
4157 goto out_err;
4158 }
4159 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4160 memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4161 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4162
4163 /* add device to alias management */
4164 dasd_alias_add_device(device);
4165
4166 return 0;
4167
4168 out_err:
4169 return -1;
4170 }
4171
4172 static int dasd_eckd_reload_device(struct dasd_device *device)
4173 {
4174 struct dasd_eckd_private *private;
4175 int rc, old_base;
4176 char print_uid[60];
4177 struct dasd_uid uid;
4178 unsigned long flags;
4179
4180 private = (struct dasd_eckd_private *) device->private;
4181
4182 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4183 old_base = private->uid.base_unit_addr;
4184 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4185
4186 /* Read Configuration Data */
4187 rc = dasd_eckd_read_conf(device);
4188 if (rc)
4189 goto out_err;
4190
4191 rc = dasd_eckd_generate_uid(device);
4192 if (rc)
4193 goto out_err;
4194 /*
4195 * update unit address configuration and
4196 * add device to alias management
4197 */
4198 dasd_alias_update_add_device(device);
4199
4200 dasd_eckd_get_uid(device, &uid);
4201
4202 if (old_base != uid.base_unit_addr) {
4203 if (strlen(uid.vduit) > 0)
4204 snprintf(print_uid, sizeof(print_uid),
4205 "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4206 uid.ssid, uid.base_unit_addr, uid.vduit);
4207 else
4208 snprintf(print_uid, sizeof(print_uid),
4209 "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4210 uid.ssid, uid.base_unit_addr);
4211
4212 dev_info(&device->cdev->dev,
4213 "An Alias device was reassigned to a new base device "
4214 "with UID: %s\n", print_uid);
4215 }
4216 return 0;
4217
4218 out_err:
4219 return -1;
4220 }
4221
4222 static struct ccw_driver dasd_eckd_driver = {
4223 .driver = {
4224 .name = "dasd-eckd",
4225 .owner = THIS_MODULE,
4226 },
4227 .ids = dasd_eckd_ids,
4228 .probe = dasd_eckd_probe,
4229 .remove = dasd_generic_remove,
4230 .set_offline = dasd_generic_set_offline,
4231 .set_online = dasd_eckd_set_online,
4232 .notify = dasd_generic_notify,
4233 .path_event = dasd_generic_path_event,
4234 .freeze = dasd_generic_pm_freeze,
4235 .thaw = dasd_generic_restore_device,
4236 .restore = dasd_generic_restore_device,
4237 .uc_handler = dasd_generic_uc_handler,
4238 .int_class = IOINT_DAS,
4239 };
4240
4241 /*
4242 * max_blocks is dependent on the amount of storage that is available
4243 * in the static io buffer for each device. Currently each device has
4244 * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4245 * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4246 * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4247 * addition we have one define extent ccw + 16 bytes of data and one
4248 * locate record ccw + 16 bytes of data. That makes:
4249 * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4250 * We want to fit two into the available memory so that we can immediately
4251 * start the next request if one finishes off. That makes 249.5 blocks
4252 * for one request. Give a little safety and the result is 240.
4253 */
4254 static struct dasd_discipline dasd_eckd_discipline = {
4255 .owner = THIS_MODULE,
4256 .name = "ECKD",
4257 .ebcname = "ECKD",
4258 .max_blocks = 190,
4259 .check_device = dasd_eckd_check_characteristics,
4260 .uncheck_device = dasd_eckd_uncheck_device,
4261 .do_analysis = dasd_eckd_do_analysis,
4262 .verify_path = dasd_eckd_verify_path,
4263 .ready_to_online = dasd_eckd_ready_to_online,
4264 .online_to_ready = dasd_eckd_online_to_ready,
4265 .fill_geometry = dasd_eckd_fill_geometry,
4266 .start_IO = dasd_start_IO,
4267 .term_IO = dasd_term_IO,
4268 .handle_terminated_request = dasd_eckd_handle_terminated_request,
4269 .format_device = dasd_eckd_format_device,
4270 .erp_action = dasd_eckd_erp_action,
4271 .erp_postaction = dasd_eckd_erp_postaction,
4272 .check_for_device_change = dasd_eckd_check_for_device_change,
4273 .build_cp = dasd_eckd_build_alias_cp,
4274 .free_cp = dasd_eckd_free_alias_cp,
4275 .dump_sense = dasd_eckd_dump_sense,
4276 .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4277 .fill_info = dasd_eckd_fill_info,
4278 .ioctl = dasd_eckd_ioctl,
4279 .freeze = dasd_eckd_pm_freeze,
4280 .restore = dasd_eckd_restore_device,
4281 .reload = dasd_eckd_reload_device,
4282 .get_uid = dasd_eckd_get_uid,
4283 .kick_validate = dasd_eckd_kick_validate_server,
4284 };
4285
4286 static int __init
4287 dasd_eckd_init(void)
4288 {
4289 int ret;
4290
4291 ASCEBC(dasd_eckd_discipline.ebcname, 4);
4292 dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4293 GFP_KERNEL | GFP_DMA);
4294 if (!dasd_reserve_req)
4295 return -ENOMEM;
4296 path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4297 GFP_KERNEL | GFP_DMA);
4298 if (!path_verification_worker) {
4299 kfree(dasd_reserve_req);
4300 return -ENOMEM;
4301 }
4302 ret = ccw_driver_register(&dasd_eckd_driver);
4303 if (!ret)
4304 wait_for_device_probe();
4305 else {
4306 kfree(path_verification_worker);
4307 kfree(dasd_reserve_req);
4308 }
4309 return ret;
4310 }
4311
4312 static void __exit
4313 dasd_eckd_cleanup(void)
4314 {
4315 ccw_driver_unregister(&dasd_eckd_driver);
4316 kfree(path_verification_worker);
4317 kfree(dasd_reserve_req);
4318 }
4319
4320 module_init(dasd_eckd_init);
4321 module_exit(dasd_eckd_cleanup);