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-rw-r--r--arch/s390/defconfig1
-rw-r--r--drivers/s390/char/Kconfig6
-rw-r--r--drivers/s390/char/Makefile1
-rw-r--r--drivers/s390/char/vmur.c906
-rw-r--r--drivers/s390/char/vmur.h104
5 files changed, 1018 insertions, 0 deletions
diff --git a/arch/s390/defconfig b/arch/s390/defconfig
index d518693b5890..2aae23dba4bb 100644
--- a/arch/s390/defconfig
+++ b/arch/s390/defconfig
@@ -512,6 +512,7 @@ CONFIG_S390_TAPE_34XX=m
512# CONFIG_VMCP is not set 512# CONFIG_VMCP is not set
513# CONFIG_MONREADER is not set 513# CONFIG_MONREADER is not set
514CONFIG_MONWRITER=m 514CONFIG_MONWRITER=m
515CONFIG_S390_VMUR=m
515# CONFIG_POWER_SUPPLY is not set 516# CONFIG_POWER_SUPPLY is not set
516 517
517# 518#
diff --git a/drivers/s390/char/Kconfig b/drivers/s390/char/Kconfig
index 66102a184322..a3d095de5d7d 100644
--- a/drivers/s390/char/Kconfig
+++ b/drivers/s390/char/Kconfig
@@ -164,3 +164,9 @@ config MONWRITER
164 help 164 help
165 Character device driver for writing z/VM monitor service records 165 Character device driver for writing z/VM monitor service records
166 166
167config S390_VMUR
168 tristate "z/VM unit record device driver"
169 default "m"
170 help
171 Character device driver for z/VM reader, puncher and printer.
172
diff --git a/drivers/s390/char/Makefile b/drivers/s390/char/Makefile
index c210784bdf46..130de19916f2 100644
--- a/drivers/s390/char/Makefile
+++ b/drivers/s390/char/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_S390_TAPE_34XX) += tape_34xx.o
29obj-$(CONFIG_S390_TAPE_3590) += tape_3590.o 29obj-$(CONFIG_S390_TAPE_3590) += tape_3590.o
30obj-$(CONFIG_MONREADER) += monreader.o 30obj-$(CONFIG_MONREADER) += monreader.o
31obj-$(CONFIG_MONWRITER) += monwriter.o 31obj-$(CONFIG_MONWRITER) += monwriter.o
32obj-$(CONFIG_S390_VMUR) += vmur.o
32 33
33zcore_mod-objs := sclp_sdias.o zcore.o 34zcore_mod-objs := sclp_sdias.o zcore.o
34obj-$(CONFIG_ZFCPDUMP) += zcore_mod.o 35obj-$(CONFIG_ZFCPDUMP) += zcore_mod.o
diff --git a/drivers/s390/char/vmur.c b/drivers/s390/char/vmur.c
new file mode 100644
index 000000000000..e90b0f846195
--- /dev/null
+++ b/drivers/s390/char/vmur.c
@@ -0,0 +1,906 @@
1/*
2 * Linux driver for System z and s390 unit record devices
3 * (z/VM virtual punch, reader, printer)
4 *
5 * Copyright IBM Corp. 2001, 2007
6 * Authors: Malcolm Beattie <beattiem@uk.ibm.com>
7 * Michael Holzheu <holzheu@de.ibm.com>
8 * Frank Munzert <munzert@de.ibm.com>
9 */
10
11#include <linux/cdev.h>
12
13#include <asm/uaccess.h>
14#include <asm/cio.h>
15#include <asm/ccwdev.h>
16#include <asm/debug.h>
17
18#include "vmur.h"
19
20/*
21 * Driver overview
22 *
23 * Unit record device support is implemented as a character device driver.
24 * We can fit at least 16 bits into a device minor number and use the
25 * simple method of mapping a character device number with minor abcd
26 * to the unit record device with devno abcd.
27 * I/O to virtual unit record devices is handled as follows:
28 * Reads: Diagnose code 0x14 (input spool file manipulation)
29 * is used to read spool data page-wise.
30 * Writes: The CCW used is WRITE_CCW_CMD (0x01). The device's record length
31 * is available by reading sysfs attr reclen. Each write() to the device
32 * must specify an integral multiple (maximal 511) of reclen.
33 */
34
35static char ur_banner[] = "z/VM virtual unit record device driver";
36
37MODULE_AUTHOR("IBM Corporation");
38MODULE_DESCRIPTION("s390 z/VM virtual unit record device driver");
39MODULE_LICENSE("GPL");
40
41#define PRINTK_HEADER "vmur: "
42
43static dev_t ur_first_dev_maj_min;
44static struct class *vmur_class;
45static struct debug_info *vmur_dbf;
46
47/* We put the device's record length (for writes) in the driver_info field */
48static struct ccw_device_id ur_ids[] = {
49 { CCWDEV_CU_DI(READER_PUNCH_DEVTYPE, 80) },
50 { CCWDEV_CU_DI(PRINTER_DEVTYPE, 132) },
51 { /* end of list */ }
52};
53
54MODULE_DEVICE_TABLE(ccw, ur_ids);
55
56static int ur_probe(struct ccw_device *cdev);
57static void ur_remove(struct ccw_device *cdev);
58static int ur_set_online(struct ccw_device *cdev);
59static int ur_set_offline(struct ccw_device *cdev);
60
61static struct ccw_driver ur_driver = {
62 .name = "vmur",
63 .owner = THIS_MODULE,
64 .ids = ur_ids,
65 .probe = ur_probe,
66 .remove = ur_remove,
67 .set_online = ur_set_online,
68 .set_offline = ur_set_offline,
69};
70
71/*
72 * Allocation, freeing, getting and putting of urdev structures
73 */
74static struct urdev *urdev_alloc(struct ccw_device *cdev)
75{
76 struct urdev *urd;
77
78 urd = kzalloc(sizeof(struct urdev), GFP_KERNEL);
79 if (!urd)
80 return NULL;
81 urd->cdev = cdev;
82 urd->reclen = cdev->id.driver_info;
83 ccw_device_get_id(cdev, &urd->dev_id);
84 mutex_init(&urd->io_mutex);
85 mutex_init(&urd->open_mutex);
86 return urd;
87}
88
89static void urdev_free(struct urdev *urd)
90{
91 kfree(urd);
92}
93
94/*
95 * This is how the character device driver gets a reference to a
96 * ur device. When this call returns successfully, a reference has
97 * been taken (by get_device) on the underlying kobject. The recipient
98 * of this urdev pointer must eventually drop it with urdev_put(urd)
99 * which does the corresponding put_device().
100 */
101static struct urdev *urdev_get_from_devno(u16 devno)
102{
103 char bus_id[16];
104 struct ccw_device *cdev;
105
106 sprintf(bus_id, "0.0.%04x", devno);
107 cdev = get_ccwdev_by_busid(&ur_driver, bus_id);
108 if (!cdev)
109 return NULL;
110
111 return cdev->dev.driver_data;
112}
113
114static void urdev_put(struct urdev *urd)
115{
116 put_device(&urd->cdev->dev);
117}
118
119/*
120 * Low-level functions to do I/O to a ur device.
121 * alloc_chan_prog
122 * do_ur_io
123 * ur_int_handler
124 *
125 * alloc_chan_prog allocates and builds the channel program
126 *
127 * do_ur_io issues the channel program to the device and blocks waiting
128 * on a completion event it publishes at urd->io_done. The function
129 * serialises itself on the device's mutex so that only one I/O
130 * is issued at a time (and that I/O is synchronous).
131 *
132 * ur_int_handler catches the "I/O done" interrupt, writes the
133 * subchannel status word into the scsw member of the urdev structure
134 * and complete()s the io_done to wake the waiting do_ur_io.
135 *
136 * The caller of do_ur_io is responsible for kfree()ing the channel program
137 * address pointer that alloc_chan_prog returned.
138 */
139
140
141/*
142 * alloc_chan_prog
143 * The channel program we use is write commands chained together
144 * with a final NOP CCW command-chained on (which ensures that CE and DE
145 * are presented together in a single interrupt instead of as separate
146 * interrupts unless an incorrect length indication kicks in first). The
147 * data length in each CCW is reclen. The caller must ensure that count
148 * is an integral multiple of reclen.
149 * The channel program pointer returned by this function must be freed
150 * with kfree. The caller is responsible for checking that
151 * count/reclen is not ridiculously large.
152 */
153static struct ccw1 *alloc_chan_prog(char *buf, size_t count, size_t reclen)
154{
155 size_t num_ccws;
156 struct ccw1 *cpa;
157 int i;
158
159 TRACE("alloc_chan_prog(%p, %zu, %zu)\n", buf, count, reclen);
160
161 /*
162 * We chain a NOP onto the writes to force CE+DE together.
163 * That means we allocate room for CCWs to cover count/reclen
164 * records plus a NOP.
165 */
166 num_ccws = count / reclen + 1;
167 cpa = kmalloc(num_ccws * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
168 if (!cpa)
169 return NULL;
170
171 for (i = 0; count; i++) {
172 cpa[i].cmd_code = WRITE_CCW_CMD;
173 cpa[i].flags = CCW_FLAG_CC | CCW_FLAG_SLI;
174 cpa[i].count = reclen;
175 cpa[i].cda = __pa(buf);
176 buf += reclen;
177 count -= reclen;
178 }
179 /* The following NOP CCW forces CE+DE to be presented together */
180 cpa[i].cmd_code = CCW_CMD_NOOP;
181 cpa[i].flags = 0;
182 cpa[i].count = 0;
183 cpa[i].cda = 0;
184
185 return cpa;
186}
187
188static int do_ur_io(struct urdev *urd, struct ccw1 *cpa)
189{
190 int rc;
191 struct ccw_device *cdev = urd->cdev;
192 DECLARE_COMPLETION(event);
193
194 TRACE("do_ur_io: cpa=%p\n", cpa);
195
196 rc = mutex_lock_interruptible(&urd->io_mutex);
197 if (rc)
198 return rc;
199
200 urd->io_done = &event;
201
202 spin_lock_irq(get_ccwdev_lock(cdev));
203 rc = ccw_device_start(cdev, cpa, 1, 0, 0);
204 spin_unlock_irq(get_ccwdev_lock(cdev));
205
206 TRACE("do_ur_io: ccw_device_start returned %d\n", rc);
207 if (rc)
208 goto out;
209
210 wait_for_completion(&event);
211 TRACE("do_ur_io: I/O complete\n");
212 rc = 0;
213
214out:
215 mutex_unlock(&urd->io_mutex);
216 return rc;
217}
218
219/*
220 * ur interrupt handler, called from the ccw_device layer
221 */
222static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm,
223 struct irb *irb)
224{
225 struct urdev *urd;
226
227 TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n",
228 intparm, irb->scsw.cstat, irb->scsw.dstat, irb->scsw.count);
229
230 if (!intparm) {
231 TRACE("ur_int_handler: unsolicited interrupt\n");
232 return;
233 }
234 urd = cdev->dev.driver_data;
235 /* On special conditions irb is an error pointer */
236 if (IS_ERR(irb))
237 urd->io_request_rc = PTR_ERR(irb);
238 else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
239 urd->io_request_rc = 0;
240 else
241 urd->io_request_rc = -EIO;
242
243 complete(urd->io_done);
244}
245
246/*
247 * reclen sysfs attribute - The record length to be used for write CCWs
248 */
249static ssize_t ur_attr_reclen_show(struct device *dev,
250 struct device_attribute *attr, char *buf)
251{
252 struct urdev *urd = dev->driver_data;
253
254 return sprintf(buf, "%zu\n", urd->reclen);
255}
256
257static DEVICE_ATTR(reclen, 0444, ur_attr_reclen_show, NULL);
258
259static int ur_create_attributes(struct device *dev)
260{
261 return device_create_file(dev, &dev_attr_reclen);
262}
263
264static void ur_remove_attributes(struct device *dev)
265{
266 device_remove_file(dev, &dev_attr_reclen);
267}
268
269/*
270 * diagnose code 0x210 - retrieve device information
271 * cc=0 normal completion, we have a real device
272 * cc=1 CP paging error
273 * cc=2 The virtual device exists, but is not associated with a real device
274 * cc=3 Invalid device address, or the virtual device does not exist
275 */
276static int get_urd_class(struct urdev *urd)
277{
278 static struct diag210 ur_diag210;
279 int cc;
280
281 ur_diag210.vrdcdvno = urd->dev_id.devno;
282 ur_diag210.vrdclen = sizeof(struct diag210);
283
284 cc = diag210(&ur_diag210);
285 switch (cc) {
286 case 0:
287 return -ENOTSUPP;
288 case 2:
289 return ur_diag210.vrdcvcla; /* virtual device class */
290 case 3:
291 return -ENODEV;
292 default:
293 return -EIO;
294 }
295}
296
297/*
298 * Allocation and freeing of urfile structures
299 */
300static struct urfile *urfile_alloc(struct urdev *urd)
301{
302 struct urfile *urf;
303
304 urf = kzalloc(sizeof(struct urfile), GFP_KERNEL);
305 if (!urf)
306 return NULL;
307 urf->urd = urd;
308
309 TRACE("urfile_alloc: urd=%p urf=%p rl=%zu\n", urd, urf,
310 urf->dev_reclen);
311
312 return urf;
313}
314
315static void urfile_free(struct urfile *urf)
316{
317 TRACE("urfile_free: urf=%p urd=%p\n", urf, urf->urd);
318 kfree(urf);
319}
320
321/*
322 * The fops implementation of the character device driver
323 */
324static ssize_t do_write(struct urdev *urd, const char __user *udata,
325 size_t count, size_t reclen, loff_t *ppos)
326{
327 struct ccw1 *cpa;
328 char *buf;
329 int rc;
330
331 /* Data buffer must be under 2GB line for fmt1 CCWs: hence GFP_DMA */
332 buf = kmalloc(count, GFP_KERNEL | GFP_DMA);
333 if (!buf)
334 return -ENOMEM;
335
336 if (copy_from_user(buf, udata, count)) {
337 rc = -EFAULT;
338 goto fail_kfree_buf;
339 }
340
341 cpa = alloc_chan_prog(buf, count, reclen);
342 if (!cpa) {
343 rc = -ENOMEM;
344 goto fail_kfree_buf;
345 }
346
347 rc = do_ur_io(urd, cpa);
348 if (rc)
349 goto fail_kfree_cpa;
350
351 if (urd->io_request_rc) {
352 rc = urd->io_request_rc;
353 goto fail_kfree_cpa;
354 }
355 *ppos += count;
356 rc = count;
357fail_kfree_cpa:
358 kfree(cpa);
359fail_kfree_buf:
360 kfree(buf);
361 return rc;
362}
363
364static ssize_t ur_write(struct file *file, const char __user *udata,
365 size_t count, loff_t *ppos)
366{
367 struct urfile *urf = file->private_data;
368
369 TRACE("ur_write: count=%zu\n", count);
370
371 if (count == 0)
372 return 0;
373
374 if (count % urf->dev_reclen)
375 return -EINVAL; /* count must be a multiple of reclen */
376
377 if (count > urf->dev_reclen * MAX_RECS_PER_IO)
378 count = urf->dev_reclen * MAX_RECS_PER_IO;
379
380 return do_write(urf->urd, udata, count, urf->dev_reclen, ppos);
381}
382
383static int do_diag_14(unsigned long rx, unsigned long ry1,
384 unsigned long subcode)
385{
386 register unsigned long _ry1 asm("2") = ry1;
387 register unsigned long _ry2 asm("3") = subcode;
388 int rc = 0;
389
390 asm volatile(
391#ifdef CONFIG_64BIT
392 " sam31\n"
393 " diag %2,2,0x14\n"
394 " sam64\n"
395#else
396 " diag %2,2,0x14\n"
397#endif
398 " ipm %0\n"
399 " srl %0,28\n"
400 : "=d" (rc), "+d" (_ry2)
401 : "d" (rx), "d" (_ry1)
402 : "cc");
403
404 TRACE("diag 14: subcode=0x%lx, cc=%i\n", subcode, rc);
405 return rc;
406}
407
408/*
409 * diagnose code 0x14 subcode 0x0028 - position spool file to designated
410 * record
411 * cc=0 normal completion
412 * cc=2 no file active on the virtual reader or device not ready
413 * cc=3 record specified is beyond EOF
414 */
415static int diag_position_to_record(int devno, int record)
416{
417 int cc;
418
419 cc = do_diag_14(record, devno, 0x28);
420 switch (cc) {
421 case 0:
422 return 0;
423 case 2:
424 return -ENOMEDIUM;
425 case 3:
426 return -ENODATA; /* position beyond end of file */
427 default:
428 return -EIO;
429 }
430}
431
432/*
433 * diagnose code 0x14 subcode 0x0000 - read next spool file buffer
434 * cc=0 normal completion
435 * cc=1 EOF reached
436 * cc=2 no file active on the virtual reader, and no file eligible
437 * cc=3 file already active on the virtual reader or specified virtual
438 * reader does not exist or is not a reader
439 */
440static int diag_read_file(int devno, char *buf)
441{
442 int cc;
443
444 cc = do_diag_14((unsigned long) buf, devno, 0x00);
445 switch (cc) {
446 case 0:
447 return 0;
448 case 1:
449 return -ENODATA;
450 case 2:
451 return -ENOMEDIUM;
452 default:
453 return -EIO;
454 }
455}
456
457static ssize_t diag14_read(struct file *file, char __user *ubuf, size_t count,
458 loff_t *offs)
459{
460 size_t len, copied, res;
461 char *buf;
462 int rc;
463 u16 reclen;
464 struct urdev *urd;
465
466 urd = ((struct urfile *) file->private_data)->urd;
467 reclen = ((struct urfile *) file->private_data)->file_reclen;
468
469 rc = diag_position_to_record(urd->dev_id.devno, *offs / PAGE_SIZE + 1);
470 if (rc == -ENODATA)
471 return 0;
472 if (rc)
473 return rc;
474
475 len = min((size_t) PAGE_SIZE, count);
476 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
477 if (!buf)
478 return -ENOMEM;
479
480 copied = 0;
481 res = (size_t) (*offs % PAGE_SIZE);
482 do {
483 rc = diag_read_file(urd->dev_id.devno, buf);
484 if (rc == -ENODATA) {
485 break;
486 }
487 if (rc)
488 goto fail;
489 if (reclen)
490 *((u16 *) &buf[FILE_RECLEN_OFFSET]) = reclen;
491 len = min(count - copied, PAGE_SIZE - res);
492 if (copy_to_user(ubuf + copied, buf + res, len)) {
493 rc = -EFAULT;
494 goto fail;
495 }
496 res = 0;
497 copied += len;
498 } while (copied != count);
499
500 *offs += copied;
501 rc = copied;
502fail:
503 kfree(buf);
504 return rc;
505}
506
507static ssize_t ur_read(struct file *file, char __user *ubuf, size_t count,
508 loff_t *offs)
509{
510 struct urdev *urd;
511 int rc;
512
513 TRACE("ur_read: count=%zu ppos=%li\n", count, (unsigned long) *offs);
514
515 if (count == 0)
516 return 0;
517
518 urd = ((struct urfile *) file->private_data)->urd;
519 rc = mutex_lock_interruptible(&urd->io_mutex);
520 if (rc)
521 return rc;
522 rc = diag14_read(file, ubuf, count, offs);
523 mutex_unlock(&urd->io_mutex);
524 return rc;
525}
526
527/*
528 * diagnose code 0x14 subcode 0x0fff - retrieve next file descriptor
529 * cc=0 normal completion
530 * cc=1 no files on reader queue or no subsequent file
531 * cc=2 spid specified is invalid
532 */
533static int diag_read_next_file_info(struct file_control_block *buf, int spid)
534{
535 int cc;
536
537 cc = do_diag_14((unsigned long) buf, spid, 0xfff);
538 switch (cc) {
539 case 0:
540 return 0;
541 default:
542 return -ENODATA;
543 }
544}
545
546static int verify_device(struct urdev *urd)
547{
548 struct file_control_block fcb;
549 char *buf;
550 int rc;
551
552 switch (urd->class) {
553 case DEV_CLASS_UR_O:
554 return 0; /* no check needed here */
555 case DEV_CLASS_UR_I:
556 /* check for empty reader device (beginning of chain) */
557 rc = diag_read_next_file_info(&fcb, 0);
558 if (rc)
559 return rc;
560
561 /* open file on virtual reader */
562 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
563 if (!buf)
564 return -ENOMEM;
565 rc = diag_read_file(urd->dev_id.devno, buf);
566 kfree(buf);
567
568 if ((rc != 0) && (rc != -ENODATA)) /* EOF does not hurt */
569 return rc;
570 return 0;
571 default:
572 return -ENOTSUPP;
573 }
574}
575
576static int get_file_reclen(struct urdev *urd)
577{
578 struct file_control_block fcb;
579 int rc;
580
581 switch (urd->class) {
582 case DEV_CLASS_UR_O:
583 return 0;
584 case DEV_CLASS_UR_I:
585 rc = diag_read_next_file_info(&fcb, 0);
586 if (rc)
587 return rc;
588 break;
589 default:
590 return -ENOTSUPP;
591 }
592 if (fcb.file_stat & FLG_CP_DUMP)
593 return 0;
594
595 return fcb.rec_len;
596}
597
598static int ur_open(struct inode *inode, struct file *file)
599{
600 u16 devno;
601 struct urdev *urd;
602 struct urfile *urf;
603 unsigned short accmode;
604 int rc;
605
606 accmode = file->f_flags & O_ACCMODE;
607
608 if (accmode == O_RDWR)
609 return -EACCES;
610
611 /*
612 * We treat the minor number as the devno of the ur device
613 * to find in the driver tree.
614 */
615 devno = MINOR(file->f_dentry->d_inode->i_rdev);
616
617 urd = urdev_get_from_devno(devno);
618 if (!urd)
619 return -ENXIO;
620
621 if (file->f_flags & O_NONBLOCK) {
622 if (!mutex_trylock(&urd->open_mutex)) {
623 rc = -EBUSY;
624 goto fail_put;
625 }
626 } else {
627 if (mutex_lock_interruptible(&urd->open_mutex)) {
628 rc = -ERESTARTSYS;
629 goto fail_put;
630 }
631 }
632
633 TRACE("ur_open\n");
634
635 if (((accmode == O_RDONLY) && (urd->class != DEV_CLASS_UR_I)) ||
636 ((accmode == O_WRONLY) && (urd->class != DEV_CLASS_UR_O))) {
637 TRACE("ur_open: unsupported dev class (%d)\n", urd->class);
638 rc = -EACCES;
639 goto fail_unlock;
640 }
641
642 rc = verify_device(urd);
643 if (rc)
644 goto fail_unlock;
645
646 urf = urfile_alloc(urd);
647 if (!urf) {
648 rc = -ENOMEM;
649 goto fail_unlock;
650 }
651
652 urf->dev_reclen = urd->reclen;
653 rc = get_file_reclen(urd);
654 if (rc < 0)
655 goto fail_urfile_free;
656 urf->file_reclen = rc;
657 file->private_data = urf;
658 return 0;
659
660fail_urfile_free:
661 urfile_free(urf);
662fail_unlock:
663 mutex_unlock(&urd->open_mutex);
664fail_put:
665 urdev_put(urd);
666 return rc;
667}
668
669static int ur_release(struct inode *inode, struct file *file)
670{
671 struct urfile *urf = file->private_data;
672
673 TRACE("ur_release\n");
674 mutex_unlock(&urf->urd->open_mutex);
675 urdev_put(urf->urd);
676 urfile_free(urf);
677 return 0;
678}
679
680static loff_t ur_llseek(struct file *file, loff_t offset, int whence)
681{
682 loff_t newpos;
683
684 if ((file->f_flags & O_ACCMODE) != O_RDONLY)
685 return -ESPIPE; /* seek allowed only for reader */
686 if (offset % PAGE_SIZE)
687 return -ESPIPE; /* only multiples of 4K allowed */
688 switch (whence) {
689 case 0: /* SEEK_SET */
690 newpos = offset;
691 break;
692 case 1: /* SEEK_CUR */
693 newpos = file->f_pos + offset;
694 break;
695 default:
696 return -EINVAL;
697 }
698 file->f_pos = newpos;
699 return newpos;
700}
701
702static struct file_operations ur_fops = {
703 .owner = THIS_MODULE,
704 .open = ur_open,
705 .release = ur_release,
706 .read = ur_read,
707 .write = ur_write,
708 .llseek = ur_llseek,
709};
710
711/*
712 * ccw_device infrastructure:
713 * ur_probe gets its own ref to the device (i.e. get_device),
714 * creates the struct urdev, the device attributes, sets up
715 * the interrupt handler and validates the virtual unit record device.
716 * ur_remove removes the device attributes, frees the struct urdev
717 * and drops (put_device) the ref to the device we got in ur_probe.
718 */
719static int ur_probe(struct ccw_device *cdev)
720{
721 struct urdev *urd;
722 int rc;
723
724 TRACE("ur_probe: cdev=%p state=%d\n", cdev, *(int *) cdev->private);
725
726 if (!get_device(&cdev->dev))
727 return -ENODEV;
728
729 urd = urdev_alloc(cdev);
730 if (!urd) {
731 rc = -ENOMEM;
732 goto fail;
733 }
734 rc = ur_create_attributes(&cdev->dev);
735 if (rc) {
736 rc = -ENOMEM;
737 goto fail;
738 }
739 cdev->dev.driver_data = urd;
740 cdev->handler = ur_int_handler;
741
742 /* validate virtual unit record device */
743 urd->class = get_urd_class(urd);
744 if (urd->class < 0) {
745 rc = urd->class;
746 goto fail;
747 }
748 if ((urd->class != DEV_CLASS_UR_I) && (urd->class != DEV_CLASS_UR_O)) {
749 rc = -ENOTSUPP;
750 goto fail;
751 }
752
753 return 0;
754
755fail:
756 urdev_free(urd);
757 put_device(&cdev->dev);
758 return rc;
759}
760
761static void ur_remove(struct ccw_device *cdev)
762{
763 struct urdev *urd = cdev->dev.driver_data;
764
765 TRACE("ur_remove\n");
766 if (cdev->online)
767 ur_set_offline(cdev);
768 ur_remove_attributes(&cdev->dev);
769 urdev_free(urd);
770 put_device(&cdev->dev);
771}
772
773static int ur_set_online(struct ccw_device *cdev)
774{
775 struct urdev *urd;
776 int minor, major, rc;
777 char node_id[16];
778
779 TRACE("ur_set_online: cdev=%p state=%d\n", cdev,
780 *(int *) cdev->private);
781
782 if (!try_module_get(ur_driver.owner))
783 return -EINVAL;
784
785 urd = (struct urdev *) cdev->dev.driver_data;
786 minor = urd->dev_id.devno;
787 major = MAJOR(ur_first_dev_maj_min);
788
789 urd->char_device = cdev_alloc();
790 if (!urd->char_device) {
791 rc = -ENOMEM;
792 goto fail_module_put;
793 }
794
795 cdev_init(urd->char_device, &ur_fops);
796 urd->char_device->dev = MKDEV(major, minor);
797 urd->char_device->owner = ur_fops.owner;
798
799 rc = cdev_add(urd->char_device, urd->char_device->dev, 1);
800 if (rc)
801 goto fail_free_cdev;
802 if (urd->cdev->id.cu_type == READER_PUNCH_DEVTYPE) {
803 if (urd->class == DEV_CLASS_UR_I)
804 sprintf(node_id, "vmrdr-%s", cdev->dev.bus_id);
805 if (urd->class == DEV_CLASS_UR_O)
806 sprintf(node_id, "vmpun-%s", cdev->dev.bus_id);
807 } else if (urd->cdev->id.cu_type == PRINTER_DEVTYPE) {
808 sprintf(node_id, "vmprt-%s", cdev->dev.bus_id);
809 } else {
810 rc = -ENOTSUPP;
811 goto fail_free_cdev;
812 }
813
814 urd->device = device_create(vmur_class, NULL, urd->char_device->dev,
815 "%s", node_id);
816 if (IS_ERR(urd->device)) {
817 rc = PTR_ERR(urd->device);
818 TRACE("ur_set_online: device_create rc=%d\n", rc);
819 goto fail_free_cdev;
820 }
821
822 return 0;
823
824fail_free_cdev:
825 cdev_del(urd->char_device);
826fail_module_put:
827 module_put(ur_driver.owner);
828
829 return rc;
830}
831
832static int ur_set_offline(struct ccw_device *cdev)
833{
834 struct urdev *urd;
835
836 TRACE("ur_set_offline: cdev=%p cdev->private=%p state=%d\n",
837 cdev, cdev->private, *(int *) cdev->private);
838 urd = (struct urdev *) cdev->dev.driver_data;
839 device_destroy(vmur_class, urd->char_device->dev);
840 cdev_del(urd->char_device);
841 module_put(ur_driver.owner);
842
843 return 0;
844}
845
846/*
847 * Module initialisation and cleanup
848 */
849static int __init ur_init(void)
850{
851 int rc;
852 dev_t dev;
853
854 if (!MACHINE_IS_VM) {
855 PRINT_ERR("%s is only available under z/VM.\n", ur_banner);
856 return -ENODEV;
857 }
858
859 vmur_dbf = debug_register("vmur", 4, 1, 4 * sizeof(long));
860 if (!vmur_dbf)
861 return -ENOMEM;
862 rc = debug_register_view(vmur_dbf, &debug_sprintf_view);
863 if (rc)
864 goto fail_free_dbf;
865
866 debug_set_level(vmur_dbf, 6);
867
868 rc = ccw_driver_register(&ur_driver);
869 if (rc)
870 goto fail_free_dbf;
871
872 rc = alloc_chrdev_region(&dev, 0, NUM_MINORS, "vmur");
873 if (rc) {
874 PRINT_ERR("alloc_chrdev_region failed: err = %d\n", rc);
875 goto fail_unregister_driver;
876 }
877 ur_first_dev_maj_min = MKDEV(MAJOR(dev), 0);
878
879 vmur_class = class_create(THIS_MODULE, "vmur");
880 if (IS_ERR(vmur_class)) {
881 rc = PTR_ERR(vmur_class);
882 goto fail_unregister_region;
883 }
884 PRINT_INFO("%s loaded.\n", ur_banner);
885 return 0;
886
887fail_unregister_region:
888 unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS);
889fail_unregister_driver:
890 ccw_driver_unregister(&ur_driver);
891fail_free_dbf:
892 debug_unregister(vmur_dbf);
893 return rc;
894}
895
896static void __exit ur_exit(void)
897{
898 class_destroy(vmur_class);
899 unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS);
900 ccw_driver_unregister(&ur_driver);
901 debug_unregister(vmur_dbf);
902 PRINT_INFO("%s unloaded.\n", ur_banner);
903}
904
905module_init(ur_init);
906module_exit(ur_exit);
diff --git a/drivers/s390/char/vmur.h b/drivers/s390/char/vmur.h
new file mode 100644
index 000000000000..16d0a4e38e40
--- /dev/null
+++ b/drivers/s390/char/vmur.h
@@ -0,0 +1,104 @@
1/*
2 * Linux driver for System z and s390 unit record devices
3 * (z/VM virtual punch, reader, printer)
4 *
5 * Copyright IBM Corp. 2001, 2007
6 * Authors: Malcolm Beattie <beattiem@uk.ibm.com>
7 * Michael Holzheu <holzheu@de.ibm.com>
8 * Frank Munzert <munzert@de.ibm.com>
9 */
10
11#ifndef _VMUR_H_
12#define _VMUR_H_
13
14#define DEV_CLASS_UR_I 0x20 /* diag210 unit record input device class */
15#define DEV_CLASS_UR_O 0x10 /* diag210 unit record output device class */
16/*
17 * we only support z/VM's default unit record devices:
18 * both in SPOOL directory control statement and in CP DEFINE statement
19 * RDR defaults to 2540 reader
20 * PUN defaults to 2540 punch
21 * PRT defaults to 1403 printer
22 */
23#define READER_PUNCH_DEVTYPE 0x2540
24#define PRINTER_DEVTYPE 0x1403
25
26/* z/VM spool file control block SFBLOK */
27struct file_control_block {
28 char reserved_1[8];
29 char user_owner[8];
30 char user_orig[8];
31 __s32 data_recs;
32 __s16 rec_len;
33 __s16 file_num;
34 __u8 file_stat;
35 __u8 dev_type;
36 char reserved_2[6];
37 char file_name[12];
38 char file_type[12];
39 char create_date[8];
40 char create_time[8];
41 char reserved_3[6];
42 __u8 file_class;
43 __u8 sfb_lok;
44 __u64 distr_code;
45 __u32 reserved_4;
46 __u8 current_starting_copy_number;
47 __u8 sfblock_cntrl_flags;
48 __u8 reserved_5;
49 __u8 more_status_flags;
50 char rest[200];
51} __attribute__ ((packed));
52
53#define FLG_CP_DUMP 0x10
54
55/*
56 * A struct urdev is created for each ur device that is made available
57 * via the ccw_device driver model.
58 */
59struct urdev {
60 struct ccw_device *cdev; /* Backpointer to ccw device */
61 struct mutex io_mutex; /* Serialises device IO */
62 struct mutex open_mutex; /* Serialises access to device */
63 struct completion *io_done; /* do_ur_io waits; irq completes */
64 struct device *device;
65 struct cdev *char_device;
66 struct ccw_dev_id dev_id; /* device id */
67 size_t reclen; /* Record length for *write* CCWs */
68 int class; /* VM device class */
69 int io_request_rc; /* return code from I/O request */
70};
71
72/*
73 * A struct urfile is allocated at open() time for each device and
74 * freed on release().
75 */
76struct urfile {
77 struct urdev *urd;
78 unsigned int flags;
79 size_t dev_reclen;
80 __u16 file_reclen;
81};
82
83/*
84 * Device major/minor definitions.
85 */
86
87#define UR_MAJOR 0 /* get dynamic major */
88/*
89 * We map minor numbers directly to device numbers (0-FFFF) for simplicity.
90 * This avoids having to allocate (and manage) slot numbers.
91 */
92#define NUM_MINORS 65536
93
94/* Limiting each I/O to 511 records limits chan prog to 4KB (511 r/w + 1 NOP) */
95#define MAX_RECS_PER_IO 511
96#define WRITE_CCW_CMD 0x01
97
98#define TRACE(x...) debug_sprintf_event(vmur_dbf, 1, x)
99#define CCWDEV_CU_DI(cutype, di) \
100 CCW_DEVICE(cutype, 0x00), .driver_info = (di)
101
102#define FILE_RECLEN_OFFSET 4064 /* reclen offset in spool data block */
103
104#endif /* _VMUR_H_ */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-27 17:11:18 -0500