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9
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11#define KMSG_COMPONENT "vmur"
12#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14#include <linux/cdev.h>
15#include <linux/smp_lock.h>
16
17#include <asm/uaccess.h>
18#include <asm/cio.h>
19#include <asm/ccwdev.h>
20#include <asm/debug.h>
21#include <asm/diag.h>
22
23#include "vmur.h"
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40static char ur_banner[] = "z/VM virtual unit record device driver";
41
42MODULE_AUTHOR("IBM Corporation");
43MODULE_DESCRIPTION("s390 z/VM virtual unit record device driver");
44MODULE_LICENSE("GPL");
45
46static dev_t ur_first_dev_maj_min;
47static struct class *vmur_class;
48static struct debug_info *vmur_dbf;
49
50
51static struct ccw_device_id ur_ids[] = {
52 { CCWDEV_CU_DI(READER_PUNCH_DEVTYPE, 80) },
53 { CCWDEV_CU_DI(PRINTER_DEVTYPE, 132) },
54 { }
55};
56
57MODULE_DEVICE_TABLE(ccw, ur_ids);
58
59static int ur_probe(struct ccw_device *cdev);
60static void ur_remove(struct ccw_device *cdev);
61static int ur_set_online(struct ccw_device *cdev);
62static int ur_set_offline(struct ccw_device *cdev);
63static int ur_pm_suspend(struct ccw_device *cdev);
64
65static struct ccw_driver ur_driver = {
66 .name = "vmur",
67 .owner = THIS_MODULE,
68 .ids = ur_ids,
69 .probe = ur_probe,
70 .remove = ur_remove,
71 .set_online = ur_set_online,
72 .set_offline = ur_set_offline,
73 .freeze = ur_pm_suspend,
74};
75
76static DEFINE_MUTEX(vmur_mutex);
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97static struct urdev *urdev_alloc(struct ccw_device *cdev)
98{
99 struct urdev *urd;
100
101 urd = kzalloc(sizeof(struct urdev), GFP_KERNEL);
102 if (!urd)
103 return NULL;
104 urd->reclen = cdev->id.driver_info;
105 ccw_device_get_id(cdev, &urd->dev_id);
106 mutex_init(&urd->io_mutex);
107 init_waitqueue_head(&urd->wait);
108 spin_lock_init(&urd->open_lock);
109 atomic_set(&urd->ref_count, 1);
110 urd->cdev = cdev;
111 get_device(&cdev->dev);
112 return urd;
113}
114
115static void urdev_free(struct urdev *urd)
116{
117 TRACE("urdev_free: %p\n", urd);
118 if (urd->cdev)
119 put_device(&urd->cdev->dev);
120 kfree(urd);
121}
122
123static void urdev_get(struct urdev *urd)
124{
125 atomic_inc(&urd->ref_count);
126}
127
128static struct urdev *urdev_get_from_cdev(struct ccw_device *cdev)
129{
130 struct urdev *urd;
131 unsigned long flags;
132
133 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
134 urd = dev_get_drvdata(&cdev->dev);
135 if (urd)
136 urdev_get(urd);
137 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
138 return urd;
139}
140
141static struct urdev *urdev_get_from_devno(u16 devno)
142{
143 char bus_id[16];
144 struct ccw_device *cdev;
145 struct urdev *urd;
146
147 sprintf(bus_id, "0.0.%04x", devno);
148 cdev = get_ccwdev_by_busid(&ur_driver, bus_id);
149 if (!cdev)
150 return NULL;
151 urd = urdev_get_from_cdev(cdev);
152 put_device(&cdev->dev);
153 return urd;
154}
155
156static void urdev_put(struct urdev *urd)
157{
158 if (atomic_dec_and_test(&urd->ref_count))
159 urdev_free(urd);
160}
161
162
163
164
165
166
167
168
169
170
171static int ur_pm_suspend(struct ccw_device *cdev)
172{
173 struct urdev *urd = dev_get_drvdata(&cdev->dev);
174
175 TRACE("ur_pm_suspend: cdev=%p\n", cdev);
176 if (urd->open_flag) {
177 pr_err("Unit record device %s is busy, %s refusing to "
178 "suspend.\n", dev_name(&cdev->dev), ur_banner);
179 return -EBUSY;
180 }
181 return 0;
182}
183
184
185
186
187
188
189
190
191
192
193
194
195
196
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199
200
201
202
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204
205
206
207static void free_chan_prog(struct ccw1 *cpa)
208{
209 struct ccw1 *ptr = cpa;
210
211 while (ptr->cda) {
212 kfree((void *)(addr_t) ptr->cda);
213 ptr++;
214 }
215 kfree(cpa);
216}
217
218
219
220
221
222
223
224
225
226static struct ccw1 *alloc_chan_prog(const char __user *ubuf, int rec_count,
227 int reclen)
228{
229 struct ccw1 *cpa;
230 void *kbuf;
231 int i;
232
233 TRACE("alloc_chan_prog(%p, %i, %i)\n", ubuf, rec_count, reclen);
234
235
236
237
238
239
240 cpa = kzalloc((rec_count + 1) * sizeof(struct ccw1),
241 GFP_KERNEL | GFP_DMA);
242 if (!cpa)
243 return ERR_PTR(-ENOMEM);
244
245 for (i = 0; i < rec_count; i++) {
246 cpa[i].cmd_code = WRITE_CCW_CMD;
247 cpa[i].flags = CCW_FLAG_CC | CCW_FLAG_SLI;
248 cpa[i].count = reclen;
249 kbuf = kmalloc(reclen, GFP_KERNEL | GFP_DMA);
250 if (!kbuf) {
251 free_chan_prog(cpa);
252 return ERR_PTR(-ENOMEM);
253 }
254 cpa[i].cda = (u32)(addr_t) kbuf;
255 if (copy_from_user(kbuf, ubuf, reclen)) {
256 free_chan_prog(cpa);
257 return ERR_PTR(-EFAULT);
258 }
259 ubuf += reclen;
260 }
261
262 cpa[i].cmd_code = CCW_CMD_NOOP;
263 return cpa;
264}
265
266static int do_ur_io(struct urdev *urd, struct ccw1 *cpa)
267{
268 int rc;
269 struct ccw_device *cdev = urd->cdev;
270 DECLARE_COMPLETION_ONSTACK(event);
271
272 TRACE("do_ur_io: cpa=%p\n", cpa);
273
274 rc = mutex_lock_interruptible(&urd->io_mutex);
275 if (rc)
276 return rc;
277
278 urd->io_done = &event;
279
280 spin_lock_irq(get_ccwdev_lock(cdev));
281 rc = ccw_device_start(cdev, cpa, 1, 0, 0);
282 spin_unlock_irq(get_ccwdev_lock(cdev));
283
284 TRACE("do_ur_io: ccw_device_start returned %d\n", rc);
285 if (rc)
286 goto out;
287
288 wait_for_completion(&event);
289 TRACE("do_ur_io: I/O complete\n");
290 rc = 0;
291
292out:
293 mutex_unlock(&urd->io_mutex);
294 return rc;
295}
296
297
298
299
300static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm,
301 struct irb *irb)
302{
303 struct urdev *urd;
304
305 TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n",
306 intparm, irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
307 irb->scsw.cmd.count);
308
309 if (!intparm) {
310 TRACE("ur_int_handler: unsolicited interrupt\n");
311 return;
312 }
313 urd = dev_get_drvdata(&cdev->dev);
314 BUG_ON(!urd);
315
316 if (IS_ERR(irb))
317 urd->io_request_rc = PTR_ERR(irb);
318 else if (irb->scsw.cmd.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
319 urd->io_request_rc = 0;
320 else
321 urd->io_request_rc = -EIO;
322
323 complete(urd->io_done);
324}
325
326
327
328
329static ssize_t ur_attr_reclen_show(struct device *dev,
330 struct device_attribute *attr, char *buf)
331{
332 struct urdev *urd;
333 int rc;
334
335 urd = urdev_get_from_cdev(to_ccwdev(dev));
336 if (!urd)
337 return -ENODEV;
338 rc = sprintf(buf, "%zu\n", urd->reclen);
339 urdev_put(urd);
340 return rc;
341}
342
343static DEVICE_ATTR(reclen, 0444, ur_attr_reclen_show, NULL);
344
345static int ur_create_attributes(struct device *dev)
346{
347 return device_create_file(dev, &dev_attr_reclen);
348}
349
350static void ur_remove_attributes(struct device *dev)
351{
352 device_remove_file(dev, &dev_attr_reclen);
353}
354
355
356
357
358
359
360
361
362static int get_urd_class(struct urdev *urd)
363{
364 static struct diag210 ur_diag210;
365 int cc;
366
367 ur_diag210.vrdcdvno = urd->dev_id.devno;
368 ur_diag210.vrdclen = sizeof(struct diag210);
369
370 cc = diag210(&ur_diag210);
371 switch (cc) {
372 case 0:
373 return -EOPNOTSUPP;
374 case 2:
375 return ur_diag210.vrdcvcla;
376 case 3:
377 return -ENODEV;
378 default:
379 return -EIO;
380 }
381}
382
383
384
385
386static struct urfile *urfile_alloc(struct urdev *urd)
387{
388 struct urfile *urf;
389
390 urf = kzalloc(sizeof(struct urfile), GFP_KERNEL);
391 if (!urf)
392 return NULL;
393 urf->urd = urd;
394
395 TRACE("urfile_alloc: urd=%p urf=%p rl=%zu\n", urd, urf,
396 urf->dev_reclen);
397
398 return urf;
399}
400
401static void urfile_free(struct urfile *urf)
402{
403 TRACE("urfile_free: urf=%p urd=%p\n", urf, urf->urd);
404 kfree(urf);
405}
406
407
408
409
410static ssize_t do_write(struct urdev *urd, const char __user *udata,
411 size_t count, size_t reclen, loff_t *ppos)
412{
413 struct ccw1 *cpa;
414 int rc;
415
416 cpa = alloc_chan_prog(udata, count / reclen, reclen);
417 if (IS_ERR(cpa))
418 return PTR_ERR(cpa);
419
420 rc = do_ur_io(urd, cpa);
421 if (rc)
422 goto fail_kfree_cpa;
423
424 if (urd->io_request_rc) {
425 rc = urd->io_request_rc;
426 goto fail_kfree_cpa;
427 }
428 *ppos += count;
429 rc = count;
430
431fail_kfree_cpa:
432 free_chan_prog(cpa);
433 return rc;
434}
435
436static ssize_t ur_write(struct file *file, const char __user *udata,
437 size_t count, loff_t *ppos)
438{
439 struct urfile *urf = file->private_data;
440
441 TRACE("ur_write: count=%zu\n", count);
442
443 if (count == 0)
444 return 0;
445
446 if (count % urf->dev_reclen)
447 return -EINVAL;
448
449 if (count > urf->dev_reclen * MAX_RECS_PER_IO)
450 count = urf->dev_reclen * MAX_RECS_PER_IO;
451
452 return do_write(urf->urd, udata, count, urf->dev_reclen, ppos);
453}
454
455
456
457
458
459
460
461
462static int diag_position_to_record(int devno, int record)
463{
464 int cc;
465
466 cc = diag14(record, devno, 0x28);
467 switch (cc) {
468 case 0:
469 return 0;
470 case 2:
471 return -ENOMEDIUM;
472 case 3:
473 return -ENODATA;
474 default:
475 return -EIO;
476 }
477}
478
479
480
481
482
483
484
485
486
487static int diag_read_file(int devno, char *buf)
488{
489 int cc;
490
491 cc = diag14((unsigned long) buf, devno, 0x00);
492 switch (cc) {
493 case 0:
494 return 0;
495 case 1:
496 return -ENODATA;
497 case 2:
498 return -ENOMEDIUM;
499 default:
500 return -EIO;
501 }
502}
503
504static ssize_t diag14_read(struct file *file, char __user *ubuf, size_t count,
505 loff_t *offs)
506{
507 size_t len, copied, res;
508 char *buf;
509 int rc;
510 u16 reclen;
511 struct urdev *urd;
512
513 urd = ((struct urfile *) file->private_data)->urd;
514 reclen = ((struct urfile *) file->private_data)->file_reclen;
515
516 rc = diag_position_to_record(urd->dev_id.devno, *offs / PAGE_SIZE + 1);
517 if (rc == -ENODATA)
518 return 0;
519 if (rc)
520 return rc;
521
522 len = min((size_t) PAGE_SIZE, count);
523 buf = (char *) __get_free_page(GFP_KERNEL | GFP_DMA);
524 if (!buf)
525 return -ENOMEM;
526
527 copied = 0;
528 res = (size_t) (*offs % PAGE_SIZE);
529 do {
530 rc = diag_read_file(urd->dev_id.devno, buf);
531 if (rc == -ENODATA) {
532 break;
533 }
534 if (rc)
535 goto fail;
536 if (reclen && (copied == 0) && (*offs < PAGE_SIZE))
537 *((u16 *) &buf[FILE_RECLEN_OFFSET]) = reclen;
538 len = min(count - copied, PAGE_SIZE - res);
539 if (copy_to_user(ubuf + copied, buf + res, len)) {
540 rc = -EFAULT;
541 goto fail;
542 }
543 res = 0;
544 copied += len;
545 } while (copied != count);
546
547 *offs += copied;
548 rc = copied;
549fail:
550 free_page((unsigned long) buf);
551 return rc;
552}
553
554static ssize_t ur_read(struct file *file, char __user *ubuf, size_t count,
555 loff_t *offs)
556{
557 struct urdev *urd;
558 int rc;
559
560 TRACE("ur_read: count=%zu ppos=%li\n", count, (unsigned long) *offs);
561
562 if (count == 0)
563 return 0;
564
565 urd = ((struct urfile *) file->private_data)->urd;
566 rc = mutex_lock_interruptible(&urd->io_mutex);
567 if (rc)
568 return rc;
569 rc = diag14_read(file, ubuf, count, offs);
570 mutex_unlock(&urd->io_mutex);
571 return rc;
572}
573
574
575
576
577
578
579
580static int diag_read_next_file_info(struct file_control_block *buf, int spid)
581{
582 int cc;
583
584 cc = diag14((unsigned long) buf, spid, 0xfff);
585 switch (cc) {
586 case 0:
587 return 0;
588 default:
589 return -ENODATA;
590 }
591}
592
593static int verify_uri_device(struct urdev *urd)
594{
595 struct file_control_block *fcb;
596 char *buf;
597 int rc;
598
599 fcb = kmalloc(sizeof(*fcb), GFP_KERNEL | GFP_DMA);
600 if (!fcb)
601 return -ENOMEM;
602
603
604 rc = diag_read_next_file_info(fcb, 0);
605 if (rc)
606 goto fail_free_fcb;
607
608
609 if (fcb->file_stat & (FLG_SYSTEM_HOLD | FLG_USER_HOLD)) {
610 rc = -EPERM;
611 goto fail_free_fcb;
612 }
613
614
615 buf = (char *) __get_free_page(GFP_KERNEL | GFP_DMA);
616 if (!buf) {
617 rc = -ENOMEM;
618 goto fail_free_fcb;
619 }
620 rc = diag_read_file(urd->dev_id.devno, buf);
621 if ((rc != 0) && (rc != -ENODATA))
622 goto fail_free_buf;
623
624
625 rc = diag_read_next_file_info(fcb, 0);
626 if (rc)
627 goto fail_free_buf;
628 if (!(fcb->file_stat & FLG_IN_USE)) {
629 rc = -EMFILE;
630 goto fail_free_buf;
631 }
632 rc = 0;
633
634fail_free_buf:
635 free_page((unsigned long) buf);
636fail_free_fcb:
637 kfree(fcb);
638 return rc;
639}
640
641static int verify_device(struct urdev *urd)
642{
643 switch (urd->class) {
644 case DEV_CLASS_UR_O:
645 return 0;
646 case DEV_CLASS_UR_I:
647 return verify_uri_device(urd);
648 default:
649 return -EOPNOTSUPP;
650 }
651}
652
653static int get_uri_file_reclen(struct urdev *urd)
654{
655 struct file_control_block *fcb;
656 int rc;
657
658 fcb = kmalloc(sizeof(*fcb), GFP_KERNEL | GFP_DMA);
659 if (!fcb)
660 return -ENOMEM;
661 rc = diag_read_next_file_info(fcb, 0);
662 if (rc)
663 goto fail_free;
664 if (fcb->file_stat & FLG_CP_DUMP)
665 rc = 0;
666 else
667 rc = fcb->rec_len;
668
669fail_free:
670 kfree(fcb);
671 return rc;
672}
673
674static int get_file_reclen(struct urdev *urd)
675{
676 switch (urd->class) {
677 case DEV_CLASS_UR_O:
678 return 0;
679 case DEV_CLASS_UR_I:
680 return get_uri_file_reclen(urd);
681 default:
682 return -EOPNOTSUPP;
683 }
684}
685
686static int ur_open(struct inode *inode, struct file *file)
687{
688 u16 devno;
689 struct urdev *urd;
690 struct urfile *urf;
691 unsigned short accmode;
692 int rc;
693
694 accmode = file->f_flags & O_ACCMODE;
695
696 if (accmode == O_RDWR)
697 return -EACCES;
698 lock_kernel();
699
700
701
702
703 devno = MINOR(file->f_dentry->d_inode->i_rdev);
704
705 urd = urdev_get_from_devno(devno);
706 if (!urd) {
707 rc = -ENXIO;
708 goto out;
709 }
710
711 spin_lock(&urd->open_lock);
712 while (urd->open_flag) {
713 spin_unlock(&urd->open_lock);
714 if (file->f_flags & O_NONBLOCK) {
715 rc = -EBUSY;
716 goto fail_put;
717 }
718 if (wait_event_interruptible(urd->wait, urd->open_flag == 0)) {
719 rc = -ERESTARTSYS;
720 goto fail_put;
721 }
722 spin_lock(&urd->open_lock);
723 }
724 urd->open_flag++;
725 spin_unlock(&urd->open_lock);
726
727 TRACE("ur_open\n");
728
729 if (((accmode == O_RDONLY) && (urd->class != DEV_CLASS_UR_I)) ||
730 ((accmode == O_WRONLY) && (urd->class != DEV_CLASS_UR_O))) {
731 TRACE("ur_open: unsupported dev class (%d)\n", urd->class);
732 rc = -EACCES;
733 goto fail_unlock;
734 }
735
736 rc = verify_device(urd);
737 if (rc)
738 goto fail_unlock;
739
740 urf = urfile_alloc(urd);
741 if (!urf) {
742 rc = -ENOMEM;
743 goto fail_unlock;
744 }
745
746 urf->dev_reclen = urd->reclen;
747 rc = get_file_reclen(urd);
748 if (rc < 0)
749 goto fail_urfile_free;
750 urf->file_reclen = rc;
751 file->private_data = urf;
752 unlock_kernel();
753 return 0;
754
755fail_urfile_free:
756 urfile_free(urf);
757fail_unlock:
758 spin_lock(&urd->open_lock);
759 urd->open_flag--;
760 spin_unlock(&urd->open_lock);
761fail_put:
762 urdev_put(urd);
763out:
764 unlock_kernel();
765 return rc;
766}
767
768static int ur_release(struct inode *inode, struct file *file)
769{
770 struct urfile *urf = file->private_data;
771
772 TRACE("ur_release\n");
773 spin_lock(&urf->urd->open_lock);
774 urf->urd->open_flag--;
775 spin_unlock(&urf->urd->open_lock);
776 wake_up_interruptible(&urf->urd->wait);
777 urdev_put(urf->urd);
778 urfile_free(urf);
779 return 0;
780}
781
782static loff_t ur_llseek(struct file *file, loff_t offset, int whence)
783{
784 loff_t newpos;
785
786 if ((file->f_flags & O_ACCMODE) != O_RDONLY)
787 return -ESPIPE;
788 if (offset % PAGE_SIZE)
789 return -ESPIPE;
790 switch (whence) {
791 case 0:
792 newpos = offset;
793 break;
794 case 1:
795 newpos = file->f_pos + offset;
796 break;
797 default:
798 return -EINVAL;
799 }
800 file->f_pos = newpos;
801 return newpos;
802}
803
804static const struct file_operations ur_fops = {
805 .owner = THIS_MODULE,
806 .open = ur_open,
807 .release = ur_release,
808 .read = ur_read,
809 .write = ur_write,
810 .llseek = ur_llseek,
811};
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827static int ur_probe(struct ccw_device *cdev)
828{
829 struct urdev *urd;
830 int rc;
831
832 TRACE("ur_probe: cdev=%p\n", cdev);
833
834 mutex_lock(&vmur_mutex);
835 urd = urdev_alloc(cdev);
836 if (!urd) {
837 rc = -ENOMEM;
838 goto fail_unlock;
839 }
840
841 rc = ur_create_attributes(&cdev->dev);
842 if (rc) {
843 rc = -ENOMEM;
844 goto fail_urdev_put;
845 }
846 cdev->handler = ur_int_handler;
847
848
849 urd->class = get_urd_class(urd);
850 if (urd->class < 0) {
851 rc = urd->class;
852 goto fail_remove_attr;
853 }
854 if ((urd->class != DEV_CLASS_UR_I) && (urd->class != DEV_CLASS_UR_O)) {
855 rc = -EOPNOTSUPP;
856 goto fail_remove_attr;
857 }
858 spin_lock_irq(get_ccwdev_lock(cdev));
859 dev_set_drvdata(&cdev->dev, urd);
860 spin_unlock_irq(get_ccwdev_lock(cdev));
861
862 mutex_unlock(&vmur_mutex);
863 return 0;
864
865fail_remove_attr:
866 ur_remove_attributes(&cdev->dev);
867fail_urdev_put:
868 urdev_put(urd);
869fail_unlock:
870 mutex_unlock(&vmur_mutex);
871 return rc;
872}
873
874static int ur_set_online(struct ccw_device *cdev)
875{
876 struct urdev *urd;
877 int minor, major, rc;
878 char node_id[16];
879
880 TRACE("ur_set_online: cdev=%p\n", cdev);
881
882 mutex_lock(&vmur_mutex);
883 urd = urdev_get_from_cdev(cdev);
884 if (!urd) {
885
886 rc = -ENODEV;
887 goto fail_unlock;
888 }
889
890 if (urd->char_device) {
891
892 rc = -EBUSY;
893 goto fail_urdev_put;
894 }
895
896 minor = urd->dev_id.devno;
897 major = MAJOR(ur_first_dev_maj_min);
898
899 urd->char_device = cdev_alloc();
900 if (!urd->char_device) {
901 rc = -ENOMEM;
902 goto fail_urdev_put;
903 }
904
905 cdev_init(urd->char_device, &ur_fops);
906 urd->char_device->dev = MKDEV(major, minor);
907 urd->char_device->owner = ur_fops.owner;
908
909 rc = cdev_add(urd->char_device, urd->char_device->dev, 1);
910 if (rc)
911 goto fail_free_cdev;
912 if (urd->cdev->id.cu_type == READER_PUNCH_DEVTYPE) {
913 if (urd->class == DEV_CLASS_UR_I)
914 sprintf(node_id, "vmrdr-%s", dev_name(&cdev->dev));
915 if (urd->class == DEV_CLASS_UR_O)
916 sprintf(node_id, "vmpun-%s", dev_name(&cdev->dev));
917 } else if (urd->cdev->id.cu_type == PRINTER_DEVTYPE) {
918 sprintf(node_id, "vmprt-%s", dev_name(&cdev->dev));
919 } else {
920 rc = -EOPNOTSUPP;
921 goto fail_free_cdev;
922 }
923
924 urd->device = device_create(vmur_class, NULL, urd->char_device->dev,
925 NULL, "%s", node_id);
926 if (IS_ERR(urd->device)) {
927 rc = PTR_ERR(urd->device);
928 TRACE("ur_set_online: device_create rc=%d\n", rc);
929 goto fail_free_cdev;
930 }
931 urdev_put(urd);
932 mutex_unlock(&vmur_mutex);
933 return 0;
934
935fail_free_cdev:
936 cdev_del(urd->char_device);
937 urd->char_device = NULL;
938fail_urdev_put:
939 urdev_put(urd);
940fail_unlock:
941 mutex_unlock(&vmur_mutex);
942 return rc;
943}
944
945static int ur_set_offline_force(struct ccw_device *cdev, int force)
946{
947 struct urdev *urd;
948 int rc;
949
950 TRACE("ur_set_offline: cdev=%p\n", cdev);
951 urd = urdev_get_from_cdev(cdev);
952 if (!urd)
953
954 return -ENODEV;
955 if (!urd->char_device) {
956
957 rc = -EBUSY;
958 goto fail_urdev_put;
959 }
960 if (!force && (atomic_read(&urd->ref_count) > 2)) {
961
962 TRACE("ur_set_offline: BUSY\n");
963 rc = -EBUSY;
964 goto fail_urdev_put;
965 }
966 device_destroy(vmur_class, urd->char_device->dev);
967 cdev_del(urd->char_device);
968 urd->char_device = NULL;
969 rc = 0;
970
971fail_urdev_put:
972 urdev_put(urd);
973 return rc;
974}
975
976static int ur_set_offline(struct ccw_device *cdev)
977{
978 int rc;
979
980 mutex_lock(&vmur_mutex);
981 rc = ur_set_offline_force(cdev, 0);
982 mutex_unlock(&vmur_mutex);
983 return rc;
984}
985
986static void ur_remove(struct ccw_device *cdev)
987{
988 unsigned long flags;
989
990 TRACE("ur_remove\n");
991
992 mutex_lock(&vmur_mutex);
993
994 if (cdev->online)
995 ur_set_offline_force(cdev, 1);
996 ur_remove_attributes(&cdev->dev);
997
998 spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
999 urdev_put(dev_get_drvdata(&cdev->dev));
1000 dev_set_drvdata(&cdev->dev, NULL);
1001 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
1002
1003 mutex_unlock(&vmur_mutex);
1004}
1005
1006
1007
1008
1009static int __init ur_init(void)
1010{
1011 int rc;
1012 dev_t dev;
1013
1014 if (!MACHINE_IS_VM) {
1015 pr_err("The %s cannot be loaded without z/VM\n",
1016 ur_banner);
1017 return -ENODEV;
1018 }
1019
1020 vmur_dbf = debug_register("vmur", 4, 1, 4 * sizeof(long));
1021 if (!vmur_dbf)
1022 return -ENOMEM;
1023 rc = debug_register_view(vmur_dbf, &debug_sprintf_view);
1024 if (rc)
1025 goto fail_free_dbf;
1026
1027 debug_set_level(vmur_dbf, 6);
1028
1029 vmur_class = class_create(THIS_MODULE, "vmur");
1030 if (IS_ERR(vmur_class)) {
1031 rc = PTR_ERR(vmur_class);
1032 goto fail_free_dbf;
1033 }
1034
1035 rc = ccw_driver_register(&ur_driver);
1036 if (rc)
1037 goto fail_class_destroy;
1038
1039 rc = alloc_chrdev_region(&dev, 0, NUM_MINORS, "vmur");
1040 if (rc) {
1041 pr_err("Kernel function alloc_chrdev_region failed with "
1042 "error code %d\n", rc);
1043 goto fail_unregister_driver;
1044 }
1045 ur_first_dev_maj_min = MKDEV(MAJOR(dev), 0);
1046
1047 pr_info("%s loaded.\n", ur_banner);
1048 return 0;
1049
1050fail_unregister_driver:
1051 ccw_driver_unregister(&ur_driver);
1052fail_class_destroy:
1053 class_destroy(vmur_class);
1054fail_free_dbf:
1055 debug_unregister(vmur_dbf);
1056 return rc;
1057}
1058
1059static void __exit ur_exit(void)
1060{
1061 unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS);
1062 ccw_driver_unregister(&ur_driver);
1063 class_destroy(vmur_class);
1064 debug_unregister(vmur_dbf);
1065 pr_info("%s unloaded.\n", ur_banner);
1066}
1067
1068module_init(ur_init);
1069module_exit(ur_exit);
1070