Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/s390/char/tape_3590.c

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

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