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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / s390 / char / tape_3590.c
blob49c6aab7ad788d6bd9c3090af9d0931922f2c2e2
1 /*
2 * drivers/s390/char/tape_3590.c
3 * tape device discipline for 3590 tapes.
4 *
5 * Copyright IBM Corp. 2001, 2009
6 * Author(s): Stefan Bader <shbader@de.ibm.com>
7 * Michael Holzheu <holzheu@de.ibm.com>
8 * Martin Schwidefsky <schwidefsky@de.ibm.com>
9 */
10
11 #define KMSG_COMPONENT "tape_3590"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/init.h>
17 #include <linux/bio.h>
18 #include <asm/ebcdic.h>
19
20 #define TAPE_DBF_AREA tape_3590_dbf
21 #define BUFSIZE 512 /* size of buffers for dynamic generated messages */
22
23 #include "tape.h"
24 #include "tape_std.h"
25 #include "tape_3590.h"
26
27 static struct workqueue_struct *tape_3590_wq;
28
29 /*
30 * Pointer to debug area.
31 */
32 debug_info_t *TAPE_DBF_AREA = NULL;
33 EXPORT_SYMBOL(TAPE_DBF_AREA);
34
35 /*******************************************************************
36 * Error Recovery functions:
37 * - Read Opposite: implemented
38 * - Read Device (buffered) log: BRA
39 * - Read Library log: BRA
40 * - Swap Devices: BRA
41 * - Long Busy: implemented
42 * - Special Intercept: BRA
43 * - Read Alternate: implemented
44 *******************************************************************/
45
46 static const char *tape_3590_msg[TAPE_3590_MAX_MSG] = {
47 [0x00] = "",
48 [0x10] = "Lost Sense",
49 [0x11] = "Assigned Elsewhere",
50 [0x12] = "Allegiance Reset",
51 [0x13] = "Shared Access Violation",
52 [0x20] = "Command Reject",
53 [0x21] = "Configuration Error",
54 [0x22] = "Protection Exception",
55 [0x23] = "Write Protect",
56 [0x24] = "Write Length",
57 [0x25] = "Read-Only Format",
58 [0x31] = "Beginning of Partition",
59 [0x33] = "End of Partition",
60 [0x34] = "End of Data",
61 [0x35] = "Block not found",
62 [0x40] = "Device Intervention",
63 [0x41] = "Loader Intervention",
64 [0x42] = "Library Intervention",
65 [0x50] = "Write Error",
66 [0x51] = "Erase Error",
67 [0x52] = "Formatting Error",
68 [0x53] = "Read Error",
69 [0x54] = "Unsupported Format",
70 [0x55] = "No Formatting",
71 [0x56] = "Positioning lost",
72 [0x57] = "Read Length",
73 [0x60] = "Unsupported Medium",
74 [0x61] = "Medium Length Error",
75 [0x62] = "Medium removed",
76 [0x64] = "Load Check",
77 [0x65] = "Unload Check",
78 [0x70] = "Equipment Check",
79 [0x71] = "Bus out Check",
80 [0x72] = "Protocol Error",
81 [0x73] = "Interface Error",
82 [0x74] = "Overrun",
83 [0x75] = "Halt Signal",
84 [0x90] = "Device fenced",
85 [0x91] = "Device Path fenced",
86 [0xa0] = "Volume misplaced",
87 [0xa1] = "Volume inaccessible",
88 [0xa2] = "Volume in input",
89 [0xa3] = "Volume ejected",
90 [0xa4] = "All categories reserved",
91 [0xa5] = "Duplicate Volume",
92 [0xa6] = "Library Manager Offline",
93 [0xa7] = "Library Output Station full",
94 [0xa8] = "Vision System non-operational",
95 [0xa9] = "Library Manager Equipment Check",
96 [0xaa] = "Library Equipment Check",
97 [0xab] = "All Library Cells full",
98 [0xac] = "No Cleaner Volumes in Library",
99 [0xad] = "I/O Station door open",
100 [0xae] = "Subsystem environmental alert",
101 };
102
103 static int crypt_supported(struct tape_device *device)
104 {
105 return TAPE390_CRYPT_SUPPORTED(TAPE_3590_CRYPT_INFO(device));
106 }
107
108 static int crypt_enabled(struct tape_device *device)
109 {
110 return TAPE390_CRYPT_ON(TAPE_3590_CRYPT_INFO(device));
111 }
112
113 static void ext_to_int_kekl(struct tape390_kekl *in,
114 struct tape3592_kekl *out)
115 {
116 int i;
117
118 memset(out, 0, sizeof(*out));
119 if (in->type == TAPE390_KEKL_TYPE_HASH)
120 out->flags |= 0x40;
121 if (in->type_on_tape == TAPE390_KEKL_TYPE_HASH)
122 out->flags |= 0x80;
123 strncpy(out->label, in->label, 64);
124 for (i = strlen(in->label); i < sizeof(out->label); i++)
125 out->label[i] = ' ';
126 ASCEBC(out->label, sizeof(out->label));
127 }
128
129 static void int_to_ext_kekl(struct tape3592_kekl *in,
130 struct tape390_kekl *out)
131 {
132 memset(out, 0, sizeof(*out));
133 if(in->flags & 0x40)
134 out->type = TAPE390_KEKL_TYPE_HASH;
135 else
136 out->type = TAPE390_KEKL_TYPE_LABEL;
137 if(in->flags & 0x80)
138 out->type_on_tape = TAPE390_KEKL_TYPE_HASH;
139 else
140 out->type_on_tape = TAPE390_KEKL_TYPE_LABEL;
141 memcpy(out->label, in->label, sizeof(in->label));
142 EBCASC(out->label, sizeof(in->label));
143 strim(out->label);
144 }
145
146 static void int_to_ext_kekl_pair(struct tape3592_kekl_pair *in,
147 struct tape390_kekl_pair *out)
148 {
149 if (in->count == 0) {
150 out->kekl[0].type = TAPE390_KEKL_TYPE_NONE;
151 out->kekl[0].type_on_tape = TAPE390_KEKL_TYPE_NONE;
152 out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
153 out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
154 } else if (in->count == 1) {
155 int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
156 out->kekl[1].type = TAPE390_KEKL_TYPE_NONE;
157 out->kekl[1].type_on_tape = TAPE390_KEKL_TYPE_NONE;
158 } else if (in->count == 2) {
159 int_to_ext_kekl(&in->kekl[0], &out->kekl[0]);
160 int_to_ext_kekl(&in->kekl[1], &out->kekl[1]);
161 } else {
162 printk("Invalid KEKL number: %d\n", in->count);
163 BUG();
164 }
165 }
166
167 static int check_ext_kekl(struct tape390_kekl *kekl)
168 {
169 if (kekl->type == TAPE390_KEKL_TYPE_NONE)
170 goto invalid;
171 if (kekl->type > TAPE390_KEKL_TYPE_HASH)
172 goto invalid;
173 if (kekl->type_on_tape == TAPE390_KEKL_TYPE_NONE)
174 goto invalid;
175 if (kekl->type_on_tape > TAPE390_KEKL_TYPE_HASH)
176 goto invalid;
177 if ((kekl->type == TAPE390_KEKL_TYPE_HASH) &&
178 (kekl->type_on_tape == TAPE390_KEKL_TYPE_LABEL))
179 goto invalid;
180
181 return 0;
182 invalid:
183 return -EINVAL;
184 }
185
186 static int check_ext_kekl_pair(struct tape390_kekl_pair *kekls)
187 {
188 if (check_ext_kekl(&kekls->kekl[0]))
189 goto invalid;
190 if (check_ext_kekl(&kekls->kekl[1]))
191 goto invalid;
192
193 return 0;
194 invalid:
195 return -EINVAL;
196 }
197
198 /*
199 * Query KEKLs
200 */
201 static int tape_3592_kekl_query(struct tape_device *device,
202 struct tape390_kekl_pair *ext_kekls)
203 {
204 struct tape_request *request;
205 struct tape3592_kekl_query_order *order;
206 struct tape3592_kekl_query_data *int_kekls;
207 int rc;
208
209 DBF_EVENT(6, "tape3592_kekl_query\n");
210 int_kekls = kmalloc(sizeof(*int_kekls), GFP_KERNEL|GFP_DMA);
211 if (!int_kekls)
212 return -ENOMEM;
213 request = tape_alloc_request(2, sizeof(*order));
214 if (IS_ERR(request)) {
215 rc = PTR_ERR(request);
216 goto fail_malloc;
217 }
218 order = request->cpdata;
219 memset(order,0,sizeof(*order));
220 order->code = 0xe2;
221 order->max_count = 2;
222 request->op = TO_KEKL_QUERY;
223 tape_ccw_cc(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
224 tape_ccw_end(request->cpaddr + 1, READ_SS_DATA, sizeof(*int_kekls),
225 int_kekls);
226 rc = tape_do_io(device, request);
227 if (rc)
228 goto fail_request;
229 int_to_ext_kekl_pair(&int_kekls->kekls, ext_kekls);
230
231 rc = 0;
232 fail_request:
233 tape_free_request(request);
234 fail_malloc:
235 kfree(int_kekls);
236 return rc;
237 }
238
239 /*
240 * IOCTL: Query KEKLs
241 */
242 static int tape_3592_ioctl_kekl_query(struct tape_device *device,
243 unsigned long arg)
244 {
245 int rc;
246 struct tape390_kekl_pair *ext_kekls;
247
248 DBF_EVENT(6, "tape_3592_ioctl_kekl_query\n");
249 if (!crypt_supported(device))
250 return -ENOSYS;
251 if (!crypt_enabled(device))
252 return -EUNATCH;
253 ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL);
254 if (!ext_kekls)
255 return -ENOMEM;
256 rc = tape_3592_kekl_query(device, ext_kekls);
257 if (rc != 0)
258 goto fail;
259 if (copy_to_user((char __user *) arg, ext_kekls, sizeof(*ext_kekls))) {
260 rc = -EFAULT;
261 goto fail;
262 }
263 rc = 0;
264 fail:
265 kfree(ext_kekls);
266 return rc;
267 }
268
269 static int tape_3590_mttell(struct tape_device *device, int mt_count);
270
271 /*
272 * Set KEKLs
273 */
274 static int tape_3592_kekl_set(struct tape_device *device,
275 struct tape390_kekl_pair *ext_kekls)
276 {
277 struct tape_request *request;
278 struct tape3592_kekl_set_order *order;
279
280 DBF_EVENT(6, "tape3592_kekl_set\n");
281 if (check_ext_kekl_pair(ext_kekls)) {
282 DBF_EVENT(6, "invalid kekls\n");
283 return -EINVAL;
284 }
285 if (tape_3590_mttell(device, 0) != 0)
286 return -EBADSLT;
287 request = tape_alloc_request(1, sizeof(*order));
288 if (IS_ERR(request))
289 return PTR_ERR(request);
290 order = request->cpdata;
291 memset(order, 0, sizeof(*order));
292 order->code = 0xe3;
293 order->kekls.count = 2;
294 ext_to_int_kekl(&ext_kekls->kekl[0], &order->kekls.kekl[0]);
295 ext_to_int_kekl(&ext_kekls->kekl[1], &order->kekls.kekl[1]);
296 request->op = TO_KEKL_SET;
297 tape_ccw_end(request->cpaddr, PERF_SUBSYS_FUNC, sizeof(*order), order);
298
299 return tape_do_io_free(device, request);
300 }
301
302 /*
303 * IOCTL: Set KEKLs
304 */
305 static int tape_3592_ioctl_kekl_set(struct tape_device *device,
306 unsigned long arg)
307 {
308 int rc;
309 struct tape390_kekl_pair *ext_kekls;
310
311 DBF_EVENT(6, "tape_3592_ioctl_kekl_set\n");
312 if (!crypt_supported(device))
313 return -ENOSYS;
314 if (!crypt_enabled(device))
315 return -EUNATCH;
316 ext_kekls = kmalloc(sizeof(*ext_kekls), GFP_KERNEL);
317 if (!ext_kekls)
318 return -ENOMEM;
319 if (copy_from_user(ext_kekls, (char __user *)arg, sizeof(*ext_kekls))) {
320 rc = -EFAULT;
321 goto out;
322 }
323 rc = tape_3592_kekl_set(device, ext_kekls);
324 out:
325 kfree(ext_kekls);
326 return rc;
327 }
328
329 /*
330 * Enable encryption
331 */
332 static struct tape_request *__tape_3592_enable_crypt(struct tape_device *device)
333 {
334 struct tape_request *request;
335 char *data;
336
337 DBF_EVENT(6, "tape_3592_enable_crypt\n");
338 if (!crypt_supported(device))
339 return ERR_PTR(-ENOSYS);
340 request = tape_alloc_request(2, 72);
341 if (IS_ERR(request))
342 return request;
343 data = request->cpdata;
344 memset(data,0,72);
345
346 data[0] = 0x05;
347 data[36 + 0] = 0x03;
348 data[36 + 1] = 0x03;
349 data[36 + 4] = 0x40;
350 data[36 + 6] = 0x01;
351 data[36 + 14] = 0x2f;
352 data[36 + 18] = 0xc3;
353 data[36 + 35] = 0x72;
354 request->op = TO_CRYPT_ON;
355 tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
356 tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
357 return request;
358 }
359
360 static int tape_3592_enable_crypt(struct tape_device *device)
361 {
362 struct tape_request *request;
363
364 request = __tape_3592_enable_crypt(device);
365 if (IS_ERR(request))
366 return PTR_ERR(request);
367 return tape_do_io_free(device, request);
368 }
369
370 static void tape_3592_enable_crypt_async(struct tape_device *device)
371 {
372 struct tape_request *request;
373
374 request = __tape_3592_enable_crypt(device);
375 if (!IS_ERR(request))
376 tape_do_io_async_free(device, request);
377 }
378
379 /*
380 * Disable encryption
381 */
382 static struct tape_request *__tape_3592_disable_crypt(struct tape_device *device)
383 {
384 struct tape_request *request;
385 char *data;
386
387 DBF_EVENT(6, "tape_3592_disable_crypt\n");
388 if (!crypt_supported(device))
389 return ERR_PTR(-ENOSYS);
390 request = tape_alloc_request(2, 72);
391 if (IS_ERR(request))
392 return request;
393 data = request->cpdata;
394 memset(data,0,72);
395
396 data[0] = 0x05;
397 data[36 + 0] = 0x03;
398 data[36 + 1] = 0x03;
399 data[36 + 35] = 0x32;
400
401 request->op = TO_CRYPT_OFF;
402 tape_ccw_cc(request->cpaddr, MODE_SET_CB, 36, data);
403 tape_ccw_end(request->cpaddr + 1, MODE_SET_CB, 36, data + 36);
404
405 return request;
406 }
407
408 static int tape_3592_disable_crypt(struct tape_device *device)
409 {
410 struct tape_request *request;
411
412 request = __tape_3592_disable_crypt(device);
413 if (IS_ERR(request))
414 return PTR_ERR(request);
415 return tape_do_io_free(device, request);
416 }
417
418 static void tape_3592_disable_crypt_async(struct tape_device *device)
419 {
420 struct tape_request *request;
421
422 request = __tape_3592_disable_crypt(device);
423 if (!IS_ERR(request))
424 tape_do_io_async_free(device, request);
425 }
426
427 /*
428 * IOCTL: Set encryption status
429 */
430 static int tape_3592_ioctl_crypt_set(struct tape_device *device,
431 unsigned long arg)
432 {
433 struct tape390_crypt_info info;
434
435 DBF_EVENT(6, "tape_3592_ioctl_crypt_set\n");
436 if (!crypt_supported(device))
437 return -ENOSYS;
438 if (copy_from_user(&info, (char __user *)arg, sizeof(info)))
439 return -EFAULT;
440 if (info.status & ~TAPE390_CRYPT_ON_MASK)
441 return -EINVAL;
442 if (info.status & TAPE390_CRYPT_ON_MASK)
443 return tape_3592_enable_crypt(device);
444 else
445 return tape_3592_disable_crypt(device);
446 }
447
448 static int tape_3590_sense_medium(struct tape_device *device);
449
450 /*
451 * IOCTL: Query enryption status
452 */
453 static int tape_3592_ioctl_crypt_query(struct tape_device *device,
454 unsigned long arg)
455 {
456 DBF_EVENT(6, "tape_3592_ioctl_crypt_query\n");
457 if (!crypt_supported(device))
458 return -ENOSYS;
459 tape_3590_sense_medium(device);
460 if (copy_to_user((char __user *) arg, &TAPE_3590_CRYPT_INFO(device),
461 sizeof(TAPE_3590_CRYPT_INFO(device))))
462 return -EFAULT;
463 else
464 return 0;
465 }
466
467 /*
468 * 3590 IOCTL Overload
469 */
470 static int
471 tape_3590_ioctl(struct tape_device *device, unsigned int cmd, unsigned long arg)
472 {
473 switch (cmd) {
474 case TAPE390_DISPLAY: {
475 struct display_struct disp;
476
477 if (copy_from_user(&disp, (char __user *) arg, sizeof(disp)))
478 return -EFAULT;
479
480 return tape_std_display(device, &disp);
481 }
482 case TAPE390_KEKL_SET:
483 return tape_3592_ioctl_kekl_set(device, arg);
484 case TAPE390_KEKL_QUERY:
485 return tape_3592_ioctl_kekl_query(device, arg);
486 case TAPE390_CRYPT_SET:
487 return tape_3592_ioctl_crypt_set(device, arg);
488 case TAPE390_CRYPT_QUERY:
489 return tape_3592_ioctl_crypt_query(device, arg);
490 default:
491 return -EINVAL; /* no additional ioctls */
492 }
493 }
494
495 /*
496 * SENSE Medium: Get Sense data about medium state
497 */
498 static int tape_3590_sense_medium(struct tape_device *device)
499 {
500 struct tape_request *request;
501
502 request = tape_alloc_request(1, 128);
503 if (IS_ERR(request))
504 return PTR_ERR(request);
505 request->op = TO_MSEN;
506 tape_ccw_end(request->cpaddr, MEDIUM_SENSE, 128, request->cpdata);
507 return tape_do_io_free(device, request);
508 }
509
510 static void tape_3590_sense_medium_async(struct tape_device *device)
511 {
512 struct tape_request *request;
513
514 request = tape_alloc_request(1, 128);
515 if (IS_ERR(request))
516 return;
517 request->op = TO_MSEN;
518 tape_ccw_end(request->cpaddr, MEDIUM_SENSE, 128, request->cpdata);
519 tape_do_io_async_free(device, request);
520 }
521
522 /*
523 * MTTELL: Tell block. Return the number of block relative to current file.
524 */
525 static int
526 tape_3590_mttell(struct tape_device *device, int mt_count)
527 {
528 __u64 block_id;
529 int rc;
530
531 rc = tape_std_read_block_id(device, &block_id);
532 if (rc)
533 return rc;
534 return block_id >> 32;
535 }
536
537 /*
538 * MTSEEK: seek to the specified block.
539 */
540 static int
541 tape_3590_mtseek(struct tape_device *device, int count)
542 {
543 struct tape_request *request;
544
545 DBF_EVENT(6, "xsee id: %x\n", count);
546 request = tape_alloc_request(3, 4);
547 if (IS_ERR(request))
548 return PTR_ERR(request);
549 request->op = TO_LBL;
550 tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
551 *(__u32 *) request->cpdata = count;
552 tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
553 tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
554 return tape_do_io_free(device, request);
555 }
556
557 /*
558 * Read Opposite Error Recovery Function:
559 * Used, when Read Forward does not work
560 */
561 static void
562 tape_3590_read_opposite(struct tape_device *device,
563 struct tape_request *request)
564 {
565 struct tape_3590_disc_data *data;
566
567 /*
568 * We have allocated 4 ccws in tape_std_read, so we can now
569 * transform the request to a read backward, followed by a
570 * forward space block.
571 */
572 request->op = TO_RBA;
573 tape_ccw_cc(request->cpaddr, MODE_SET_DB, 1, device->modeset_byte);
574 data = device->discdata;
575 tape_ccw_cc_idal(request->cpaddr + 1, data->read_back_op,
576 device->char_data.idal_buf);
577 tape_ccw_cc(request->cpaddr + 2, FORSPACEBLOCK, 0, NULL);
578 tape_ccw_end(request->cpaddr + 3, NOP, 0, NULL);
579 DBF_EVENT(6, "xrop ccwg\n");
580 }
581
582 /*
583 * Read Attention Msg
584 * This should be done after an interrupt with attention bit (0x80)
585 * in device state.
586 *
587 * After a "read attention message" request there are two possible
588 * results:
589 *
590 * 1. A unit check is presented, when attention sense is present (e.g. when
591 * a medium has been unloaded). The attention sense comes then
592 * together with the unit check. The recovery action is either "retry"
593 * (in case there is an attention message pending) or "permanent error".
594 *
595 * 2. The attention msg is written to the "read subsystem data" buffer.
596 * In this case we probably should print it to the console.
597 */
598 static void tape_3590_read_attmsg_async(struct tape_device *device)
599 {
600 struct tape_request *request;
601 char *buf;
602
603 request = tape_alloc_request(3, 4096);
604 if (IS_ERR(request))
605 return;
606 request->op = TO_READ_ATTMSG;
607 buf = request->cpdata;
608 buf[0] = PREP_RD_SS_DATA;
609 buf[6] = RD_ATTMSG; /* read att msg */
610 tape_ccw_cc(request->cpaddr, PERFORM_SS_FUNC, 12, buf);
611 tape_ccw_cc(request->cpaddr + 1, READ_SS_DATA, 4096 - 12, buf + 12);
612 tape_ccw_end(request->cpaddr + 2, NOP, 0, NULL);
613 tape_do_io_async_free(device, request);
614 }
615
616 /*
617 * These functions are used to schedule follow-up actions from within an
618 * interrupt context (like unsolicited interrupts).
619 * Note: the work handler is called by the system work queue. The tape
620 * commands started by the handler need to be asynchrounous, otherwise
621 * a deadlock can occur e.g. in case of a deferred cc=1 (see __tape_do_irq).
622 */
623 struct work_handler_data {
624 struct tape_device *device;
625 enum tape_op op;
626 struct work_struct work;
627 };
628
629 static void
630 tape_3590_work_handler(struct work_struct *work)
631 {
632 struct work_handler_data *p =
633 container_of(work, struct work_handler_data, work);
634
635 switch (p->op) {
636 case TO_MSEN:
637 tape_3590_sense_medium_async(p->device);
638 break;
639 case TO_READ_ATTMSG:
640 tape_3590_read_attmsg_async(p->device);
641 break;
642 case TO_CRYPT_ON:
643 tape_3592_enable_crypt_async(p->device);
644 break;
645 case TO_CRYPT_OFF:
646 tape_3592_disable_crypt_async(p->device);
647 break;
648 default:
649 DBF_EVENT(3, "T3590: work handler undefined for "
650 "operation 0x%02x\n", p->op);
651 }
652 tape_put_device(p->device);
653 kfree(p);
654 }
655
656 static int
657 tape_3590_schedule_work(struct tape_device *device, enum tape_op op)
658 {
659 struct work_handler_data *p;
660
661 if ((p = kzalloc(sizeof(*p), GFP_ATOMIC)) == NULL)
662 return -ENOMEM;
663
664 INIT_WORK(&p->work, tape_3590_work_handler);
665
666 p->device = tape_get_device(device);
667 p->op = op;
668
669 queue_work(tape_3590_wq, &p->work);
670 return 0;
671 }
672
673 #ifdef CONFIG_S390_TAPE_BLOCK
674 /*
675 * Tape Block READ
676 */
677 static struct tape_request *
678 tape_3590_bread(struct tape_device *device, struct request *req)
679 {
680 struct tape_request *request;
681 struct ccw1 *ccw;
682 int count = 0, start_block;
683 unsigned off;
684 char *dst;
685 struct bio_vec *bv;
686 struct req_iterator iter;
687
688 DBF_EVENT(6, "xBREDid:");
689 start_block = blk_rq_pos(req) >> TAPEBLOCK_HSEC_S2B;
690 DBF_EVENT(6, "start_block = %i\n", start_block);
691
692 rq_for_each_segment(bv, req, iter)
693 count += bv->bv_len >> (TAPEBLOCK_HSEC_S2B + 9);
694
695 request = tape_alloc_request(2 + count + 1, 4);
696 if (IS_ERR(request))
697 return request;
698 request->op = TO_BLOCK;
699 *(__u32 *) request->cpdata = start_block;
700 ccw = request->cpaddr;
701 ccw = tape_ccw_cc(ccw, MODE_SET_DB, 1, device->modeset_byte);
702
703 /*
704 * We always setup a nop after the mode set ccw. This slot is
705 * used in tape_std_check_locate to insert a locate ccw if the
706 * current tape position doesn't match the start block to be read.
707 */
708 ccw = tape_ccw_cc(ccw, NOP, 0, NULL);
709
710 rq_for_each_segment(bv, req, iter) {
711 dst = page_address(bv->bv_page) + bv->bv_offset;
712 for (off = 0; off < bv->bv_len; off += TAPEBLOCK_HSEC_SIZE) {
713 ccw->flags = CCW_FLAG_CC;
714 ccw->cmd_code = READ_FORWARD;
715 ccw->count = TAPEBLOCK_HSEC_SIZE;
716 set_normalized_cda(ccw, (void *) __pa(dst));
717 ccw++;
718 dst += TAPEBLOCK_HSEC_SIZE;
719 }
720 BUG_ON(off > bv->bv_len);
721 }
722 ccw = tape_ccw_end(ccw, NOP, 0, NULL);
723 DBF_EVENT(6, "xBREDccwg\n");
724 return request;
725 }
726
727 static void
728 tape_3590_free_bread(struct tape_request *request)
729 {
730 struct ccw1 *ccw;
731
732 /* Last ccw is a nop and doesn't need clear_normalized_cda */
733 for (ccw = request->cpaddr; ccw->flags & CCW_FLAG_CC; ccw++)
734 if (ccw->cmd_code == READ_FORWARD)
735 clear_normalized_cda(ccw);
736 tape_free_request(request);
737 }
738
739 /*
740 * check_locate is called just before the tape request is passed to
741 * the common io layer for execution. It has to check the current
742 * tape position and insert a locate ccw if it doesn't match the
743 * start block for the request.
744 */
745 static void
746 tape_3590_check_locate(struct tape_device *device, struct tape_request *request)
747 {
748 __u32 *start_block;
749
750 start_block = (__u32 *) request->cpdata;
751 if (*start_block != device->blk_data.block_position) {
752 /* Add the start offset of the file to get the real block. */
753 *start_block += device->bof;
754 tape_ccw_cc(request->cpaddr + 1, LOCATE, 4, request->cpdata);
755 }
756 }
757 #endif
758
759 static void tape_3590_med_state_set(struct tape_device *device,
760 struct tape_3590_med_sense *sense)
761 {
762 struct tape390_crypt_info *c_info;
763
764 c_info = &TAPE_3590_CRYPT_INFO(device);
765
766 DBF_EVENT(6, "medium state: %x:%x\n", sense->macst, sense->masst);
767 switch (sense->macst) {
768 case 0x04:
769 case 0x05:
770 case 0x06:
771 tape_med_state_set(device, MS_UNLOADED);
772 TAPE_3590_CRYPT_INFO(device).medium_status = 0;
773 return;
774 case 0x08:
775 case 0x09:
776 tape_med_state_set(device, MS_LOADED);
777 break;
778 default:
779 tape_med_state_set(device, MS_UNKNOWN);
780 return;
781 }
782 c_info->medium_status |= TAPE390_MEDIUM_LOADED_MASK;
783 if (sense->flags & MSENSE_CRYPT_MASK) {
784 DBF_EVENT(6, "Medium is encrypted (%04x)\n", sense->flags);
785 c_info->medium_status |= TAPE390_MEDIUM_ENCRYPTED_MASK;
786 } else {
787 DBF_EVENT(6, "Medium is not encrypted %04x\n", sense->flags);
788 c_info->medium_status &= ~TAPE390_MEDIUM_ENCRYPTED_MASK;
789 }
790 }
791
792 /*
793 * The done handler is called at device/channel end and wakes up the sleeping
794 * process
795 */
796 static int
797 tape_3590_done(struct tape_device *device, struct tape_request *request)
798 {
799
800 DBF_EVENT(6, "%s done\n", tape_op_verbose[request->op]);
801
802 switch (request->op) {
803 case TO_BSB:
804 case TO_BSF:
805 case TO_DSE:
806 case TO_FSB:
807 case TO_FSF:
808 case TO_LBL:
809 case TO_RFO:
810 case TO_RBA:
811 case TO_REW:
812 case TO_WRI:
813 case TO_WTM:
814 case TO_BLOCK:
815 case TO_LOAD:
816 tape_med_state_set(device, MS_LOADED);
817 break;
818 case TO_RUN:
819 tape_med_state_set(device, MS_UNLOADED);
820 tape_3590_schedule_work(device, TO_CRYPT_OFF);
821 break;
822 case TO_MSEN:
823 tape_3590_med_state_set(device, request->cpdata);
824 break;
825 case TO_CRYPT_ON:
826 TAPE_3590_CRYPT_INFO(device).status
827 |= TAPE390_CRYPT_ON_MASK;
828 *(device->modeset_byte) |= 0x03;
829 break;
830 case TO_CRYPT_OFF:
831 TAPE_3590_CRYPT_INFO(device).status
832 &= ~TAPE390_CRYPT_ON_MASK;
833 *(device->modeset_byte) &= ~0x03;
834 break;
835 case TO_RBI: /* RBI seems to succeed even without medium loaded. */
836 case TO_NOP: /* Same to NOP. */
837 case TO_READ_CONFIG:
838 case TO_READ_ATTMSG:
839 case TO_DIS:
840 case TO_ASSIGN:
841 case TO_UNASSIGN:
842 case TO_SIZE:
843 case TO_KEKL_SET:
844 case TO_KEKL_QUERY:
845 case TO_RDC:
846 break;
847 }
848 return TAPE_IO_SUCCESS;
849 }
850
851 /*
852 * This function is called, when error recovery was successful
853 */
854 static inline int
855 tape_3590_erp_succeded(struct tape_device *device, struct tape_request *request)
856 {
857 DBF_EVENT(3, "Error Recovery successful for %s\n",
858 tape_op_verbose[request->op]);
859 return tape_3590_done(device, request);
860 }
861
862 /*
863 * This function is called, when error recovery was not successful
864 */
865 static inline int
866 tape_3590_erp_failed(struct tape_device *device, struct tape_request *request,
867 struct irb *irb, int rc)
868 {
869 DBF_EVENT(3, "Error Recovery failed for %s\n",
870 tape_op_verbose[request->op]);
871 tape_dump_sense_dbf(device, request, irb);
872 return rc;
873 }
874
875 /*
876 * Error Recovery do retry
877 */
878 static inline int
879 tape_3590_erp_retry(struct tape_device *device, struct tape_request *request,
880 struct irb *irb)
881 {
882 DBF_EVENT(2, "Retry: %s\n", tape_op_verbose[request->op]);
883 tape_dump_sense_dbf(device, request, irb);
884 return TAPE_IO_RETRY;
885 }
886
887 /*
888 * Handle unsolicited interrupts
889 */
890 static int
891 tape_3590_unsolicited_irq(struct tape_device *device, struct irb *irb)
892 {
893 if (irb->scsw.cmd.dstat == DEV_STAT_CHN_END)
894 /* Probably result of halt ssch */
895 return TAPE_IO_PENDING;
896 else if (irb->scsw.cmd.dstat == 0x85)
897 /* Device Ready */
898 DBF_EVENT(3, "unsol.irq! tape ready: %08x\n", device->cdev_id);
899 else if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
900 tape_3590_schedule_work(device, TO_READ_ATTMSG);
901 } else {
902 DBF_EVENT(3, "unsol.irq! dev end: %08x\n", device->cdev_id);
903 tape_dump_sense_dbf(device, NULL, irb);
904 }
905 /* check medium state */
906 tape_3590_schedule_work(device, TO_MSEN);
907 return TAPE_IO_SUCCESS;
908 }
909
910 /*
911 * Basic Recovery routine
912 */
913 static int
914 tape_3590_erp_basic(struct tape_device *device, struct tape_request *request,
915 struct irb *irb, int rc)
916 {
917 struct tape_3590_sense *sense;
918
919 sense = (struct tape_3590_sense *) irb->ecw;
920
921 switch (sense->bra) {
922 case SENSE_BRA_PER:
923 return tape_3590_erp_failed(device, request, irb, rc);
924 case SENSE_BRA_CONT:
925 return tape_3590_erp_succeded(device, request);
926 case SENSE_BRA_RE:
927 return tape_3590_erp_retry(device, request, irb);
928 case SENSE_BRA_DRE:
929 return tape_3590_erp_failed(device, request, irb, rc);
930 default:
931 BUG();
932 return TAPE_IO_STOP;
933 }
934 }
935
936 /*
937 * RDL: Read Device (buffered) log
938 */
939 static int
940 tape_3590_erp_read_buf_log(struct tape_device *device,
941 struct tape_request *request, struct irb *irb)
942 {
943 /*
944 * We just do the basic error recovery at the moment (retry).
945 * Perhaps in the future, we read the log and dump it somewhere...
946 */
947 return tape_3590_erp_basic(device, request, irb, -EIO);
948 }
949
950 /*
951 * SWAP: Swap Devices
952 */
953 static int
954 tape_3590_erp_swap(struct tape_device *device, struct tape_request *request,
955 struct irb *irb)
956 {
957 /*
958 * This error recovery should swap the tapes
959 * if the original has a problem. The operation
960 * should proceed with the new tape... this
961 * should probably be done in user space!
962 */
963 dev_warn (&device->cdev->dev, "The tape medium must be loaded into a "
964 "different tape unit\n");
965 return tape_3590_erp_basic(device, request, irb, -EIO);
966 }
967
968 /*
969 * LBY: Long Busy
970 */
971 static int
972 tape_3590_erp_long_busy(struct tape_device *device,
973 struct tape_request *request, struct irb *irb)
974 {
975 DBF_EVENT(6, "Device is busy\n");
976 return TAPE_IO_LONG_BUSY;
977 }
978
979 /*
980 * SPI: Special Intercept
981 */
982 static int
983 tape_3590_erp_special_interrupt(struct tape_device *device,
984 struct tape_request *request, struct irb *irb)
985 {
986 return tape_3590_erp_basic(device, request, irb, -EIO);
987 }
988
989 /*
990 * RDA: Read Alternate
991 */
992 static int
993 tape_3590_erp_read_alternate(struct tape_device *device,
994 struct tape_request *request, struct irb *irb)
995 {
996 struct tape_3590_disc_data *data;
997
998 /*
999 * The issued Read Backward or Read Previous command is not
1000 * supported by the device
1001 * The recovery action should be to issue another command:
1002 * Read Revious: if Read Backward is not supported
1003 * Read Backward: if Read Previous is not supported
1004 */
1005 data = device->discdata;
1006 if (data->read_back_op == READ_PREVIOUS) {
1007 DBF_EVENT(2, "(%08x): No support for READ_PREVIOUS command\n",
1008 device->cdev_id);
1009 data->read_back_op = READ_BACKWARD;
1010 } else {
1011 DBF_EVENT(2, "(%08x): No support for READ_BACKWARD command\n",
1012 device->cdev_id);
1013 data->read_back_op = READ_PREVIOUS;
1014 }
1015 tape_3590_read_opposite(device, request);
1016 return tape_3590_erp_retry(device, request, irb);
1017 }
1018
1019 /*
1020 * Error Recovery read opposite
1021 */
1022 static int
1023 tape_3590_erp_read_opposite(struct tape_device *device,
1024 struct tape_request *request, struct irb *irb)
1025 {
1026 switch (request->op) {
1027 case TO_RFO:
1028 /*
1029 * We did read forward, but the data could not be read.
1030 * We will read backward and then skip forward again.
1031 */
1032 tape_3590_read_opposite(device, request);
1033 return tape_3590_erp_retry(device, request, irb);
1034 case TO_RBA:
1035 /* We tried to read forward and backward, but hat no success */
1036 return tape_3590_erp_failed(device, request, irb, -EIO);
1037 break;
1038 default:
1039 return tape_3590_erp_failed(device, request, irb, -EIO);
1040 }
1041 }
1042
1043 /*
1044 * Print an MIM (Media Information Message) (message code f0)
1045 */
1046 static void
1047 tape_3590_print_mim_msg_f0(struct tape_device *device, struct irb *irb)
1048 {
1049 struct tape_3590_sense *sense;
1050 char *exception, *service;
1051
1052 exception = kmalloc(BUFSIZE, GFP_ATOMIC);
1053 service = kmalloc(BUFSIZE, GFP_ATOMIC);
1054
1055 if (!exception || !service)
1056 goto out_nomem;
1057
1058 sense = (struct tape_3590_sense *) irb->ecw;
1059 /* Exception Message */
1060 switch (sense->fmt.f70.emc) {
1061 case 0x02:
1062 snprintf(exception, BUFSIZE, "Data degraded");
1063 break;
1064 case 0x03:
1065 snprintf(exception, BUFSIZE, "Data degraded in partion %i",
1066 sense->fmt.f70.mp);
1067 break;
1068 case 0x04:
1069 snprintf(exception, BUFSIZE, "Medium degraded");
1070 break;
1071 case 0x05:
1072 snprintf(exception, BUFSIZE, "Medium degraded in partition %i",
1073 sense->fmt.f70.mp);
1074 break;
1075 case 0x06:
1076 snprintf(exception, BUFSIZE, "Block 0 Error");
1077 break;
1078 case 0x07:
1079 snprintf(exception, BUFSIZE, "Medium Exception 0x%02x",
1080 sense->fmt.f70.md);
1081 break;
1082 default:
1083 snprintf(exception, BUFSIZE, "0x%02x",
1084 sense->fmt.f70.emc);
1085 break;
1086 }
1087 /* Service Message */
1088 switch (sense->fmt.f70.smc) {
1089 case 0x02:
1090 snprintf(service, BUFSIZE, "Reference Media maintenance "
1091 "procedure %i", sense->fmt.f70.md);
1092 break;
1093 default:
1094 snprintf(service, BUFSIZE, "0x%02x",
1095 sense->fmt.f70.smc);
1096 break;
1097 }
1098
1099 dev_warn (&device->cdev->dev, "Tape media information: exception %s, "
1100 "service %s\n", exception, service);
1101
1102 out_nomem:
1103 kfree(exception);
1104 kfree(service);
1105 }
1106
1107 /*
1108 * Print an I/O Subsystem Service Information Message (message code f1)
1109 */
1110 static void
1111 tape_3590_print_io_sim_msg_f1(struct tape_device *device, struct irb *irb)
1112 {
1113 struct tape_3590_sense *sense;
1114 char *exception, *service;
1115
1116 exception = kmalloc(BUFSIZE, GFP_ATOMIC);
1117 service = kmalloc(BUFSIZE, GFP_ATOMIC);
1118
1119 if (!exception || !service)
1120 goto out_nomem;
1121
1122 sense = (struct tape_3590_sense *) irb->ecw;
1123 /* Exception Message */
1124 switch (sense->fmt.f71.emc) {
1125 case 0x01:
1126 snprintf(exception, BUFSIZE, "Effect of failure is unknown");
1127 break;
1128 case 0x02:
1129 snprintf(exception, BUFSIZE, "CU Exception - no performance "
1130 "impact");
1131 break;
1132 case 0x03:
1133 snprintf(exception, BUFSIZE, "CU Exception on channel "
1134 "interface 0x%02x", sense->fmt.f71.md[0]);
1135 break;
1136 case 0x04:
1137 snprintf(exception, BUFSIZE, "CU Exception on device path "
1138 "0x%02x", sense->fmt.f71.md[0]);
1139 break;
1140 case 0x05:
1141 snprintf(exception, BUFSIZE, "CU Exception on library path "
1142 "0x%02x", sense->fmt.f71.md[0]);
1143 break;
1144 case 0x06:
1145 snprintf(exception, BUFSIZE, "CU Exception on node 0x%02x",
1146 sense->fmt.f71.md[0]);
1147 break;
1148 case 0x07:
1149 snprintf(exception, BUFSIZE, "CU Exception on partition "
1150 "0x%02x", sense->fmt.f71.md[0]);
1151 break;
1152 default:
1153 snprintf(exception, BUFSIZE, "0x%02x",
1154 sense->fmt.f71.emc);
1155 }
1156 /* Service Message */
1157 switch (sense->fmt.f71.smc) {
1158 case 0x01:
1159 snprintf(service, BUFSIZE, "Repair impact is unknown");
1160 break;
1161 case 0x02:
1162 snprintf(service, BUFSIZE, "Repair will not impact cu "
1163 "performance");
1164 break;
1165 case 0x03:
1166 if (sense->fmt.f71.mdf == 0)
1167 snprintf(service, BUFSIZE, "Repair will disable node "
1168 "0x%x on CU", sense->fmt.f71.md[1]);
1169 else
1170 snprintf(service, BUFSIZE, "Repair will disable "
1171 "nodes (0x%x-0x%x) on CU", sense->fmt.f71.md[1],
1172 sense->fmt.f71.md[2]);
1173 break;
1174 case 0x04:
1175 if (sense->fmt.f71.mdf == 0)
1176 snprintf(service, BUFSIZE, "Repair will disable "
1177 "channel path 0x%x on CU",
1178 sense->fmt.f71.md[1]);
1179 else
1180 snprintf(service, BUFSIZE, "Repair will disable cannel"
1181 " paths (0x%x-0x%x) on CU",
1182 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1183 break;
1184 case 0x05:
1185 if (sense->fmt.f71.mdf == 0)
1186 snprintf(service, BUFSIZE, "Repair will disable device"
1187 " path 0x%x on CU", sense->fmt.f71.md[1]);
1188 else
1189 snprintf(service, BUFSIZE, "Repair will disable device"
1190 " paths (0x%x-0x%x) on CU",
1191 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1192 break;
1193 case 0x06:
1194 if (sense->fmt.f71.mdf == 0)
1195 snprintf(service, BUFSIZE, "Repair will disable "
1196 "library path 0x%x on CU",
1197 sense->fmt.f71.md[1]);
1198 else
1199 snprintf(service, BUFSIZE, "Repair will disable "
1200 "library paths (0x%x-0x%x) on CU",
1201 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1202 break;
1203 case 0x07:
1204 snprintf(service, BUFSIZE, "Repair will disable access to CU");
1205 break;
1206 default:
1207 snprintf(service, BUFSIZE, "0x%02x",
1208 sense->fmt.f71.smc);
1209 }
1210
1211 dev_warn (&device->cdev->dev, "I/O subsystem information: exception"
1212 " %s, service %s\n", exception, service);
1213 out_nomem:
1214 kfree(exception);
1215 kfree(service);
1216 }
1217
1218 /*
1219 * Print an Device Subsystem Service Information Message (message code f2)
1220 */
1221 static void
1222 tape_3590_print_dev_sim_msg_f2(struct tape_device *device, struct irb *irb)
1223 {
1224 struct tape_3590_sense *sense;
1225 char *exception, *service;
1226
1227 exception = kmalloc(BUFSIZE, GFP_ATOMIC);
1228 service = kmalloc(BUFSIZE, GFP_ATOMIC);
1229
1230 if (!exception || !service)
1231 goto out_nomem;
1232
1233 sense = (struct tape_3590_sense *) irb->ecw;
1234 /* Exception Message */
1235 switch (sense->fmt.f71.emc) {
1236 case 0x01:
1237 snprintf(exception, BUFSIZE, "Effect of failure is unknown");
1238 break;
1239 case 0x02:
1240 snprintf(exception, BUFSIZE, "DV Exception - no performance"
1241 " impact");
1242 break;
1243 case 0x03:
1244 snprintf(exception, BUFSIZE, "DV Exception on channel "
1245 "interface 0x%02x", sense->fmt.f71.md[0]);
1246 break;
1247 case 0x04:
1248 snprintf(exception, BUFSIZE, "DV Exception on loader 0x%02x",
1249 sense->fmt.f71.md[0]);
1250 break;
1251 case 0x05:
1252 snprintf(exception, BUFSIZE, "DV Exception on message display"
1253 " 0x%02x", sense->fmt.f71.md[0]);
1254 break;
1255 case 0x06:
1256 snprintf(exception, BUFSIZE, "DV Exception in tape path");
1257 break;
1258 case 0x07:
1259 snprintf(exception, BUFSIZE, "DV Exception in drive");
1260 break;
1261 default:
1262 snprintf(exception, BUFSIZE, "0x%02x",
1263 sense->fmt.f71.emc);
1264 }
1265 /* Service Message */
1266 switch (sense->fmt.f71.smc) {
1267 case 0x01:
1268 snprintf(service, BUFSIZE, "Repair impact is unknown");
1269 break;
1270 case 0x02:
1271 snprintf(service, BUFSIZE, "Repair will not impact device "
1272 "performance");
1273 break;
1274 case 0x03:
1275 if (sense->fmt.f71.mdf == 0)
1276 snprintf(service, BUFSIZE, "Repair will disable "
1277 "channel path 0x%x on DV",
1278 sense->fmt.f71.md[1]);
1279 else
1280 snprintf(service, BUFSIZE, "Repair will disable "
1281 "channel path (0x%x-0x%x) on DV",
1282 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1283 break;
1284 case 0x04:
1285 if (sense->fmt.f71.mdf == 0)
1286 snprintf(service, BUFSIZE, "Repair will disable "
1287 "interface 0x%x on DV", sense->fmt.f71.md[1]);
1288 else
1289 snprintf(service, BUFSIZE, "Repair will disable "
1290 "interfaces (0x%x-0x%x) on DV",
1291 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1292 break;
1293 case 0x05:
1294 if (sense->fmt.f71.mdf == 0)
1295 snprintf(service, BUFSIZE, "Repair will disable loader"
1296 " 0x%x on DV", sense->fmt.f71.md[1]);
1297 else
1298 snprintf(service, BUFSIZE, "Repair will disable loader"
1299 " (0x%x-0x%x) on DV",
1300 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1301 break;
1302 case 0x07:
1303 snprintf(service, BUFSIZE, "Repair will disable access to DV");
1304 break;
1305 case 0x08:
1306 if (sense->fmt.f71.mdf == 0)
1307 snprintf(service, BUFSIZE, "Repair will disable "
1308 "message display 0x%x on DV",
1309 sense->fmt.f71.md[1]);
1310 else
1311 snprintf(service, BUFSIZE, "Repair will disable "
1312 "message displays (0x%x-0x%x) on DV",
1313 sense->fmt.f71.md[1], sense->fmt.f71.md[2]);
1314 break;
1315 case 0x09:
1316 snprintf(service, BUFSIZE, "Clean DV");
1317 break;
1318 default:
1319 snprintf(service, BUFSIZE, "0x%02x",
1320 sense->fmt.f71.smc);
1321 }
1322
1323 dev_warn (&device->cdev->dev, "Device subsystem information: exception"
1324 " %s, service %s\n", exception, service);
1325 out_nomem:
1326 kfree(exception);
1327 kfree(service);
1328 }
1329
1330 /*
1331 * Print standard ERA Message
1332 */
1333 static void
1334 tape_3590_print_era_msg(struct tape_device *device, struct irb *irb)
1335 {
1336 struct tape_3590_sense *sense;
1337
1338 sense = (struct tape_3590_sense *) irb->ecw;
1339 if (sense->mc == 0)
1340 return;
1341 if ((sense->mc > 0) && (sense->mc < TAPE_3590_MAX_MSG)) {
1342 if (tape_3590_msg[sense->mc] != NULL)
1343 dev_warn (&device->cdev->dev, "The tape unit has "
1344 "issued sense message %s\n",
1345 tape_3590_msg[sense->mc]);
1346 else
1347 dev_warn (&device->cdev->dev, "The tape unit has "
1348 "issued an unknown sense message code 0x%x\n",
1349 sense->mc);
1350 return;
1351 }
1352 if (sense->mc == 0xf0) {
1353 /* Standard Media Information Message */
1354 dev_warn (&device->cdev->dev, "MIM SEV=%i, MC=%02x, ES=%x/%x, "
1355 "RC=%02x-%04x-%02x\n", sense->fmt.f70.sev, sense->mc,
1356 sense->fmt.f70.emc, sense->fmt.f70.smc,
1357 sense->fmt.f70.refcode, sense->fmt.f70.mid,
1358 sense->fmt.f70.fid);
1359 tape_3590_print_mim_msg_f0(device, irb);
1360 return;
1361 }
1362 if (sense->mc == 0xf1) {
1363 /* Standard I/O Subsystem Service Information Message */
1364 dev_warn (&device->cdev->dev, "IOSIM SEV=%i, DEVTYPE=3590/%02x,"
1365 " MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n",
1366 sense->fmt.f71.sev, device->cdev->id.dev_model,
1367 sense->mc, sense->fmt.f71.emc, sense->fmt.f71.smc,
1368 sense->fmt.f71.refcode1, sense->fmt.f71.refcode2,
1369 sense->fmt.f71.refcode3);
1370 tape_3590_print_io_sim_msg_f1(device, irb);
1371 return;
1372 }
1373 if (sense->mc == 0xf2) {
1374 /* Standard Device Service Information Message */
1375 dev_warn (&device->cdev->dev, "DEVSIM SEV=%i, DEVTYPE=3590/%02x"
1376 ", MC=%02x, ES=%x/%x, REF=0x%04x-0x%04x-0x%04x\n",
1377 sense->fmt.f71.sev, device->cdev->id.dev_model,
1378 sense->mc, sense->fmt.f71.emc, sense->fmt.f71.smc,
1379 sense->fmt.f71.refcode1, sense->fmt.f71.refcode2,
1380 sense->fmt.f71.refcode3);
1381 tape_3590_print_dev_sim_msg_f2(device, irb);
1382 return;
1383 }
1384 if (sense->mc == 0xf3) {
1385 /* Standard Library Service Information Message */
1386 return;
1387 }
1388 dev_warn (&device->cdev->dev, "The tape unit has issued an unknown "
1389 "sense message code %x\n", sense->mc);
1390 }
1391
1392 static int tape_3590_crypt_error(struct tape_device *device,
1393 struct tape_request *request, struct irb *irb)
1394 {
1395 u8 cu_rc;
1396 u16 ekm_rc2;
1397 char *sense;
1398
1399 sense = ((struct tape_3590_sense *) irb->ecw)->fmt.data;
1400 cu_rc = sense[0];
1401 ekm_rc2 = *((u16*) &sense[10]);
1402 if ((cu_rc == 0) && (ekm_rc2 == 0xee31))
1403 /* key not defined on EKM */
1404 return tape_3590_erp_basic(device, request, irb, -EKEYREJECTED);
1405 if ((cu_rc == 1) || (cu_rc == 2))
1406 /* No connection to EKM */
1407 return tape_3590_erp_basic(device, request, irb, -ENOTCONN);
1408
1409 dev_err (&device->cdev->dev, "The tape unit failed to obtain the "
1410 "encryption key from EKM\n");
1411
1412 return tape_3590_erp_basic(device, request, irb, -ENOKEY);
1413 }
1414
1415 /*
1416 * 3590 error Recovery routine:
1417 * If possible, it tries to recover from the error. If this is not possible,
1418 * inform the user about the problem.
1419 */
1420 static int
1421 tape_3590_unit_check(struct tape_device *device, struct tape_request *request,
1422 struct irb *irb)
1423 {
1424 struct tape_3590_sense *sense;
1425
1426 #ifdef CONFIG_S390_TAPE_BLOCK
1427 if (request->op == TO_BLOCK) {
1428 /*
1429 * Recovery for block device requests. Set the block_position
1430 * to something invalid and retry.
1431 */
1432 device->blk_data.block_position = -1;
1433 if (request->retries-- <= 0)
1434 return tape_3590_erp_failed(device, request, irb, -EIO);
1435 else
1436 return tape_3590_erp_retry(device, request, irb);
1437 }
1438 #endif
1439
1440 sense = (struct tape_3590_sense *) irb->ecw;
1441
1442 DBF_EVENT(6, "Unit Check: RQC = %x\n", sense->rc_rqc);
1443
1444 /*
1445 * First check all RC-QRCs where we want to do something special
1446 * - "break": basic error recovery is done
1447 * - "goto out:": just print error message if available
1448 */
1449 switch (sense->rc_rqc) {
1450
1451 case 0x1110:
1452 tape_3590_print_era_msg(device, irb);
1453 return tape_3590_erp_read_buf_log(device, request, irb);
1454
1455 case 0x2011:
1456 tape_3590_print_era_msg(device, irb);
1457 return tape_3590_erp_read_alternate(device, request, irb);
1458
1459 case 0x2230:
1460 case 0x2231:
1461 tape_3590_print_era_msg(device, irb);
1462 return tape_3590_erp_special_interrupt(device, request, irb);
1463 case 0x2240:
1464 return tape_3590_crypt_error(device, request, irb);
1465
1466 case 0x3010:
1467 DBF_EVENT(2, "(%08x): Backward at Beginning of Partition\n",
1468 device->cdev_id);
1469 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1470 case 0x3012:
1471 DBF_EVENT(2, "(%08x): Forward at End of Partition\n",
1472 device->cdev_id);
1473 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1474 case 0x3020:
1475 DBF_EVENT(2, "(%08x): End of Data Mark\n", device->cdev_id);
1476 return tape_3590_erp_basic(device, request, irb, -ENOSPC);
1477
1478 case 0x3122:
1479 DBF_EVENT(2, "(%08x): Rewind Unload initiated\n",
1480 device->cdev_id);
1481 return tape_3590_erp_basic(device, request, irb, -EIO);
1482 case 0x3123:
1483 DBF_EVENT(2, "(%08x): Rewind Unload complete\n",
1484 device->cdev_id);
1485 tape_med_state_set(device, MS_UNLOADED);
1486 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1487 return tape_3590_erp_basic(device, request, irb, 0);
1488
1489 case 0x4010:
1490 /*
1491 * print additional msg since default msg
1492 * "device intervention" is not very meaningfull
1493 */
1494 tape_med_state_set(device, MS_UNLOADED);
1495 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1496 return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
1497 case 0x4012: /* Device Long Busy */
1498 /* XXX: Also use long busy handling here? */
1499 DBF_EVENT(6, "(%08x): LONG BUSY\n", device->cdev_id);
1500 tape_3590_print_era_msg(device, irb);
1501 return tape_3590_erp_basic(device, request, irb, -EBUSY);
1502 case 0x4014:
1503 DBF_EVENT(6, "(%08x): Crypto LONG BUSY\n", device->cdev_id);
1504 return tape_3590_erp_long_busy(device, request, irb);
1505
1506 case 0x5010:
1507 if (sense->rac == 0xd0) {
1508 /* Swap */
1509 tape_3590_print_era_msg(device, irb);
1510 return tape_3590_erp_swap(device, request, irb);
1511 }
1512 if (sense->rac == 0x26) {
1513 /* Read Opposite */
1514 tape_3590_print_era_msg(device, irb);
1515 return tape_3590_erp_read_opposite(device, request,
1516 irb);
1517 }
1518 return tape_3590_erp_basic(device, request, irb, -EIO);
1519 case 0x5020:
1520 case 0x5021:
1521 case 0x5022:
1522 case 0x5040:
1523 case 0x5041:
1524 case 0x5042:
1525 tape_3590_print_era_msg(device, irb);
1526 return tape_3590_erp_swap(device, request, irb);
1527
1528 case 0x5110:
1529 case 0x5111:
1530 return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);
1531
1532 case 0x5120:
1533 case 0x1120:
1534 tape_med_state_set(device, MS_UNLOADED);
1535 tape_3590_schedule_work(device, TO_CRYPT_OFF);
1536 return tape_3590_erp_basic(device, request, irb, -ENOMEDIUM);
1537
1538 case 0x6020:
1539 return tape_3590_erp_basic(device, request, irb, -EMEDIUMTYPE);
1540
1541 case 0x8011:
1542 return tape_3590_erp_basic(device, request, irb, -EPERM);
1543 case 0x8013:
1544 dev_warn (&device->cdev->dev, "A different host has privileged"
1545 " access to the tape unit\n");
1546 return tape_3590_erp_basic(device, request, irb, -EPERM);
1547 default:
1548 return tape_3590_erp_basic(device, request, irb, -EIO);
1549 }
1550 }
1551
1552 /*
1553 * 3590 interrupt handler:
1554 */
1555 static int
1556 tape_3590_irq(struct tape_device *device, struct tape_request *request,
1557 struct irb *irb)
1558 {
1559 if (request == NULL)
1560 return tape_3590_unsolicited_irq(device, irb);
1561
1562 if ((irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) &&
1563 (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) &&
1564 (request->op == TO_WRI)) {
1565 /* Write at end of volume */
1566 DBF_EVENT(2, "End of volume\n");
1567 return tape_3590_erp_failed(device, request, irb, -ENOSPC);
1568 }
1569
1570 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
1571 return tape_3590_unit_check(device, request, irb);
1572
1573 if (irb->scsw.cmd.dstat & DEV_STAT_DEV_END) {
1574 if (irb->scsw.cmd.dstat == DEV_STAT_UNIT_EXCEP) {
1575 if (request->op == TO_FSB || request->op == TO_BSB)
1576 request->rescnt++;
1577 else
1578 DBF_EVENT(5, "Unit Exception!\n");
1579 }
1580
1581 return tape_3590_done(device, request);
1582 }
1583
1584 if (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) {
1585 DBF_EVENT(2, "cannel end\n");
1586 return TAPE_IO_PENDING;
1587 }
1588
1589 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1590 DBF_EVENT(2, "Unit Attention when busy..\n");
1591 return TAPE_IO_PENDING;
1592 }
1593
1594 DBF_EVENT(6, "xunknownirq\n");
1595 tape_dump_sense_dbf(device, request, irb);
1596 return TAPE_IO_STOP;
1597 }
1598
1599
1600 static int tape_3590_read_dev_chars(struct tape_device *device,
1601 struct tape_3590_rdc_data *rdc_data)
1602 {
1603 int rc;
1604 struct tape_request *request;
1605
1606 request = tape_alloc_request(1, sizeof(*rdc_data));
1607 if (IS_ERR(request))
1608 return PTR_ERR(request);
1609 request->op = TO_RDC;
1610 tape_ccw_end(request->cpaddr, CCW_CMD_RDC, sizeof(*rdc_data),
1611 request->cpdata);
1612 rc = tape_do_io(device, request);
1613 if (rc == 0)
1614 memcpy(rdc_data, request->cpdata, sizeof(*rdc_data));
1615 tape_free_request(request);
1616 return rc;
1617 }
1618
1619 /*
1620 * Setup device function
1621 */
1622 static int
1623 tape_3590_setup_device(struct tape_device *device)
1624 {
1625 int rc;
1626 struct tape_3590_disc_data *data;
1627 struct tape_3590_rdc_data *rdc_data;
1628
1629 DBF_EVENT(6, "3590 device setup\n");
1630 data = kzalloc(sizeof(struct tape_3590_disc_data), GFP_KERNEL | GFP_DMA);
1631 if (data == NULL)
1632 return -ENOMEM;
1633 data->read_back_op = READ_PREVIOUS;
1634 device->discdata = data;
1635
1636 rdc_data = kmalloc(sizeof(*rdc_data), GFP_KERNEL | GFP_DMA);
1637 if (!rdc_data) {
1638 rc = -ENOMEM;
1639 goto fail_kmalloc;
1640 }
1641 rc = tape_3590_read_dev_chars(device, rdc_data);
1642 if (rc) {
1643 DBF_LH(3, "Read device characteristics failed!\n");
1644 goto fail_rdc_data;
1645 }
1646 rc = tape_std_assign(device);
1647 if (rc)
1648 goto fail_rdc_data;
1649 if (rdc_data->data[31] == 0x13) {
1650 data->crypt_info.capability |= TAPE390_CRYPT_SUPPORTED_MASK;
1651 tape_3592_disable_crypt(device);
1652 } else {
1653 DBF_EVENT(6, "Device has NO crypto support\n");
1654 }
1655 /* Try to find out if medium is loaded */
1656 rc = tape_3590_sense_medium(device);
1657 if (rc) {
1658 DBF_LH(3, "3590 medium sense returned %d\n", rc);
1659 goto fail_rdc_data;
1660 }
1661 return 0;
1662
1663 fail_rdc_data:
1664 kfree(rdc_data);
1665 fail_kmalloc:
1666 kfree(data);
1667 return rc;
1668 }
1669
1670 /*
1671 * Cleanup device function
1672 */
1673 static void
1674 tape_3590_cleanup_device(struct tape_device *device)
1675 {
1676 flush_workqueue(tape_3590_wq);
1677 tape_std_unassign(device);
1678
1679 kfree(device->discdata);
1680 device->discdata = NULL;
1681 }
1682
1683 /*
1684 * List of 3590 magnetic tape commands.
1685 */
1686 static tape_mtop_fn tape_3590_mtop[TAPE_NR_MTOPS] = {
1687 [MTRESET] = tape_std_mtreset,
1688 [MTFSF] = tape_std_mtfsf,
1689 [MTBSF] = tape_std_mtbsf,
1690 [MTFSR] = tape_std_mtfsr,
1691 [MTBSR] = tape_std_mtbsr,
1692 [MTWEOF] = tape_std_mtweof,
1693 [MTREW] = tape_std_mtrew,
1694 [MTOFFL] = tape_std_mtoffl,
1695 [MTNOP] = tape_std_mtnop,
1696 [MTRETEN] = tape_std_mtreten,
1697 [MTBSFM] = tape_std_mtbsfm,
1698 [MTFSFM] = tape_std_mtfsfm,
1699 [MTEOM] = tape_std_mteom,
1700 [MTERASE] = tape_std_mterase,
1701 [MTRAS1] = NULL,
1702 [MTRAS2] = NULL,
1703 [MTRAS3] = NULL,
1704 [MTSETBLK] = tape_std_mtsetblk,
1705 [MTSETDENSITY] = NULL,
1706 [MTSEEK] = tape_3590_mtseek,
1707 [MTTELL] = tape_3590_mttell,
1708 [MTSETDRVBUFFER] = NULL,
1709 [MTFSS] = NULL,
1710 [MTBSS] = NULL,
1711 [MTWSM] = NULL,
1712 [MTLOCK] = NULL,
1713 [MTUNLOCK] = NULL,
1714 [MTLOAD] = tape_std_mtload,
1715 [MTUNLOAD] = tape_std_mtunload,
1716 [MTCOMPRESSION] = tape_std_mtcompression,
1717 [MTSETPART] = NULL,
1718 [MTMKPART] = NULL
1719 };
1720
1721 /*
1722 * Tape discipline structure for 3590.
1723 */
1724 static struct tape_discipline tape_discipline_3590 = {
1725 .owner = THIS_MODULE,
1726 .setup_device = tape_3590_setup_device,
1727 .cleanup_device = tape_3590_cleanup_device,
1728 .process_eov = tape_std_process_eov,
1729 .irq = tape_3590_irq,
1730 .read_block = tape_std_read_block,
1731 .write_block = tape_std_write_block,
1732 #ifdef CONFIG_S390_TAPE_BLOCK
1733 .bread = tape_3590_bread,
1734 .free_bread = tape_3590_free_bread,
1735 .check_locate = tape_3590_check_locate,
1736 #endif
1737 .ioctl_fn = tape_3590_ioctl,
1738 .mtop_array = tape_3590_mtop
1739 };
1740
1741 static struct ccw_device_id tape_3590_ids[] = {
1742 {CCW_DEVICE_DEVTYPE(0x3590, 0, 0x3590, 0), .driver_info = tape_3590},
1743 {CCW_DEVICE_DEVTYPE(0x3592, 0, 0x3592, 0), .driver_info = tape_3592},
1744 { /* end of list */ }
1745 };
1746
1747 static int
1748 tape_3590_online(struct ccw_device *cdev)
1749 {
1750 return tape_generic_online(dev_get_drvdata(&cdev->dev),
1751 &tape_discipline_3590);
1752 }
1753
1754 static struct ccw_driver tape_3590_driver = {
1755 .driver = {
1756 .name = "tape_3590",
1757 .owner = THIS_MODULE,
1758 },
1759 .ids = tape_3590_ids,
1760 .probe = tape_generic_probe,
1761 .remove = tape_generic_remove,
1762 .set_offline = tape_generic_offline,
1763 .set_online = tape_3590_online,
1764 .freeze = tape_generic_pm_suspend,
1765 .int_class = IOINT_TAP,
1766 };
1767
1768 /*
1769 * Setup discipline structure.
1770 */
1771 static int
1772 tape_3590_init(void)
1773 {
1774 int rc;
1775
1776 TAPE_DBF_AREA = debug_register("tape_3590", 2, 2, 4 * sizeof(long));
1777 debug_register_view(TAPE_DBF_AREA, &debug_sprintf_view);
1778 #ifdef DBF_LIKE_HELL
1779 debug_set_level(TAPE_DBF_AREA, 6);
1780 #endif
1781
1782 DBF_EVENT(3, "3590 init\n");
1783
1784 tape_3590_wq = alloc_workqueue("tape_3590", 0, 0);
1785 if (!tape_3590_wq)
1786 return -ENOMEM;
1787
1788 /* Register driver for 3590 tapes. */
1789 rc = ccw_driver_register(&tape_3590_driver);
1790 if (rc) {
1791 destroy_workqueue(tape_3590_wq);
1792 DBF_EVENT(3, "3590 init failed\n");
1793 } else
1794 DBF_EVENT(3, "3590 registered\n");
1795 return rc;
1796 }
1797
1798 static void
1799 tape_3590_exit(void)
1800 {
1801 ccw_driver_unregister(&tape_3590_driver);
1802 destroy_workqueue(tape_3590_wq);
1803 debug_unregister(TAPE_DBF_AREA);
1804 }
1805
1806 MODULE_DEVICE_TABLE(ccw, tape_3590_ids);
1807 MODULE_AUTHOR("(C) 2001,2006 IBM Corporation");
1808 MODULE_DESCRIPTION("Linux on zSeries channel attached 3590 tape device driver");
1809 MODULE_LICENSE("GPL");
1810
1811 module_init(tape_3590_init);
1812 module_exit(tape_3590_exit);