Commit | Line | Data |
---|---|---|
810cb5b3 FM |
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> | |
0a87c5cf | 17 | #include <asm/diag.h> |
810cb5b3 FM |
18 | |
19 | #include "vmur.h" | |
20 | ||
21 | /* | |
22 | * Driver overview | |
23 | * | |
24 | * Unit record device support is implemented as a character device driver. | |
25 | * We can fit at least 16 bits into a device minor number and use the | |
26 | * simple method of mapping a character device number with minor abcd | |
27 | * to the unit record device with devno abcd. | |
28 | * I/O to virtual unit record devices is handled as follows: | |
29 | * Reads: Diagnose code 0x14 (input spool file manipulation) | |
30 | * is used to read spool data page-wise. | |
31 | * Writes: The CCW used is WRITE_CCW_CMD (0x01). The device's record length | |
32 | * is available by reading sysfs attr reclen. Each write() to the device | |
33 | * must specify an integral multiple (maximal 511) of reclen. | |
34 | */ | |
35 | ||
36 | static char ur_banner[] = "z/VM virtual unit record device driver"; | |
37 | ||
38 | MODULE_AUTHOR("IBM Corporation"); | |
39 | MODULE_DESCRIPTION("s390 z/VM virtual unit record device driver"); | |
40 | MODULE_LICENSE("GPL"); | |
41 | ||
42 | #define PRINTK_HEADER "vmur: " | |
43 | ||
44 | static dev_t ur_first_dev_maj_min; | |
45 | static struct class *vmur_class; | |
46 | static struct debug_info *vmur_dbf; | |
47 | ||
48 | /* We put the device's record length (for writes) in the driver_info field */ | |
49 | static struct ccw_device_id ur_ids[] = { | |
50 | { CCWDEV_CU_DI(READER_PUNCH_DEVTYPE, 80) }, | |
51 | { CCWDEV_CU_DI(PRINTER_DEVTYPE, 132) }, | |
52 | { /* end of list */ } | |
53 | }; | |
54 | ||
55 | MODULE_DEVICE_TABLE(ccw, ur_ids); | |
56 | ||
57 | static int ur_probe(struct ccw_device *cdev); | |
58 | static void ur_remove(struct ccw_device *cdev); | |
59 | static int ur_set_online(struct ccw_device *cdev); | |
60 | static int ur_set_offline(struct ccw_device *cdev); | |
61 | ||
62 | static struct ccw_driver ur_driver = { | |
63 | .name = "vmur", | |
64 | .owner = THIS_MODULE, | |
65 | .ids = ur_ids, | |
66 | .probe = ur_probe, | |
67 | .remove = ur_remove, | |
68 | .set_online = ur_set_online, | |
69 | .set_offline = ur_set_offline, | |
70 | }; | |
71 | ||
8127a1f8 MH |
72 | static DEFINE_MUTEX(vmur_mutex); |
73 | ||
810cb5b3 FM |
74 | /* |
75 | * Allocation, freeing, getting and putting of urdev structures | |
8127a1f8 MH |
76 | * |
77 | * Each ur device (urd) contains a reference to its corresponding ccw device | |
78 | * (cdev) using the urd->cdev pointer. Each ccw device has a reference to the | |
79 | * ur device using the cdev->dev.driver_data pointer. | |
80 | * | |
81 | * urd references: | |
82 | * - ur_probe gets a urd reference, ur_remove drops the reference | |
83 | * (cdev->dev.driver_data) | |
84 | * - ur_open gets a urd reference, ur_relase drops the reference | |
85 | * (urf->urd) | |
86 | * | |
87 | * cdev references: | |
88 | * - urdev_alloc get a cdev reference (urd->cdev) | |
89 | * - urdev_free drops the cdev reference (urd->cdev) | |
90 | * | |
91 | * Setting and clearing of cdev->dev.driver_data is protected by the ccwdev lock | |
810cb5b3 FM |
92 | */ |
93 | static struct urdev *urdev_alloc(struct ccw_device *cdev) | |
94 | { | |
95 | struct urdev *urd; | |
96 | ||
97 | urd = kzalloc(sizeof(struct urdev), GFP_KERNEL); | |
98 | if (!urd) | |
99 | return NULL; | |
810cb5b3 FM |
100 | urd->reclen = cdev->id.driver_info; |
101 | ccw_device_get_id(cdev, &urd->dev_id); | |
102 | mutex_init(&urd->io_mutex); | |
103 | mutex_init(&urd->open_mutex); | |
8127a1f8 MH |
104 | atomic_set(&urd->ref_count, 1); |
105 | urd->cdev = cdev; | |
106 | get_device(&cdev->dev); | |
810cb5b3 FM |
107 | return urd; |
108 | } | |
109 | ||
110 | static void urdev_free(struct urdev *urd) | |
111 | { | |
8127a1f8 MH |
112 | TRACE("urdev_free: %p\n", urd); |
113 | if (urd->cdev) | |
114 | put_device(&urd->cdev->dev); | |
810cb5b3 FM |
115 | kfree(urd); |
116 | } | |
117 | ||
8127a1f8 MH |
118 | static void urdev_get(struct urdev *urd) |
119 | { | |
120 | atomic_inc(&urd->ref_count); | |
121 | } | |
122 | ||
123 | static struct urdev *urdev_get_from_cdev(struct ccw_device *cdev) | |
124 | { | |
125 | struct urdev *urd; | |
126 | unsigned long flags; | |
127 | ||
128 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
129 | urd = cdev->dev.driver_data; | |
130 | if (urd) | |
131 | urdev_get(urd); | |
132 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
133 | return urd; | |
134 | } | |
135 | ||
810cb5b3 FM |
136 | static struct urdev *urdev_get_from_devno(u16 devno) |
137 | { | |
138 | char bus_id[16]; | |
139 | struct ccw_device *cdev; | |
8127a1f8 | 140 | struct urdev *urd; |
810cb5b3 FM |
141 | |
142 | sprintf(bus_id, "0.0.%04x", devno); | |
143 | cdev = get_ccwdev_by_busid(&ur_driver, bus_id); | |
144 | if (!cdev) | |
145 | return NULL; | |
8127a1f8 MH |
146 | urd = urdev_get_from_cdev(cdev); |
147 | put_device(&cdev->dev); | |
148 | return urd; | |
810cb5b3 FM |
149 | } |
150 | ||
151 | static void urdev_put(struct urdev *urd) | |
152 | { | |
8127a1f8 MH |
153 | if (atomic_dec_and_test(&urd->ref_count)) |
154 | urdev_free(urd); | |
810cb5b3 FM |
155 | } |
156 | ||
157 | /* | |
158 | * Low-level functions to do I/O to a ur device. | |
159 | * alloc_chan_prog | |
1eade380 | 160 | * free_chan_prog |
810cb5b3 FM |
161 | * do_ur_io |
162 | * ur_int_handler | |
163 | * | |
164 | * alloc_chan_prog allocates and builds the channel program | |
1eade380 | 165 | * free_chan_prog frees memory of the channel program |
810cb5b3 FM |
166 | * |
167 | * do_ur_io issues the channel program to the device and blocks waiting | |
168 | * on a completion event it publishes at urd->io_done. The function | |
169 | * serialises itself on the device's mutex so that only one I/O | |
170 | * is issued at a time (and that I/O is synchronous). | |
171 | * | |
172 | * ur_int_handler catches the "I/O done" interrupt, writes the | |
173 | * subchannel status word into the scsw member of the urdev structure | |
174 | * and complete()s the io_done to wake the waiting do_ur_io. | |
175 | * | |
176 | * The caller of do_ur_io is responsible for kfree()ing the channel program | |
177 | * address pointer that alloc_chan_prog returned. | |
178 | */ | |
179 | ||
1eade380 MH |
180 | static void free_chan_prog(struct ccw1 *cpa) |
181 | { | |
182 | struct ccw1 *ptr = cpa; | |
183 | ||
184 | while (ptr->cda) { | |
185 | kfree((void *)(addr_t) ptr->cda); | |
186 | ptr++; | |
187 | } | |
188 | kfree(cpa); | |
189 | } | |
810cb5b3 FM |
190 | |
191 | /* | |
192 | * alloc_chan_prog | |
193 | * The channel program we use is write commands chained together | |
194 | * with a final NOP CCW command-chained on (which ensures that CE and DE | |
195 | * are presented together in a single interrupt instead of as separate | |
196 | * interrupts unless an incorrect length indication kicks in first). The | |
1eade380 | 197 | * data length in each CCW is reclen. |
810cb5b3 | 198 | */ |
1eade380 MH |
199 | static struct ccw1 *alloc_chan_prog(const char __user *ubuf, int rec_count, |
200 | int reclen) | |
810cb5b3 | 201 | { |
810cb5b3 | 202 | struct ccw1 *cpa; |
1eade380 | 203 | void *kbuf; |
810cb5b3 FM |
204 | int i; |
205 | ||
1eade380 | 206 | TRACE("alloc_chan_prog(%p, %i, %i)\n", ubuf, rec_count, reclen); |
810cb5b3 FM |
207 | |
208 | /* | |
209 | * We chain a NOP onto the writes to force CE+DE together. | |
210 | * That means we allocate room for CCWs to cover count/reclen | |
211 | * records plus a NOP. | |
212 | */ | |
1eade380 MH |
213 | cpa = kzalloc((rec_count + 1) * sizeof(struct ccw1), |
214 | GFP_KERNEL | GFP_DMA); | |
810cb5b3 | 215 | if (!cpa) |
1eade380 | 216 | return ERR_PTR(-ENOMEM); |
810cb5b3 | 217 | |
1eade380 | 218 | for (i = 0; i < rec_count; i++) { |
810cb5b3 FM |
219 | cpa[i].cmd_code = WRITE_CCW_CMD; |
220 | cpa[i].flags = CCW_FLAG_CC | CCW_FLAG_SLI; | |
221 | cpa[i].count = reclen; | |
1eade380 MH |
222 | kbuf = kmalloc(reclen, GFP_KERNEL | GFP_DMA); |
223 | if (!kbuf) { | |
224 | free_chan_prog(cpa); | |
225 | return ERR_PTR(-ENOMEM); | |
226 | } | |
227 | cpa[i].cda = (u32)(addr_t) kbuf; | |
228 | if (copy_from_user(kbuf, ubuf, reclen)) { | |
229 | free_chan_prog(cpa); | |
230 | return ERR_PTR(-EFAULT); | |
231 | } | |
232 | ubuf += reclen; | |
810cb5b3 FM |
233 | } |
234 | /* The following NOP CCW forces CE+DE to be presented together */ | |
235 | cpa[i].cmd_code = CCW_CMD_NOOP; | |
810cb5b3 FM |
236 | return cpa; |
237 | } | |
238 | ||
239 | static int do_ur_io(struct urdev *urd, struct ccw1 *cpa) | |
240 | { | |
241 | int rc; | |
242 | struct ccw_device *cdev = urd->cdev; | |
278bc68c | 243 | DECLARE_COMPLETION_ONSTACK(event); |
810cb5b3 FM |
244 | |
245 | TRACE("do_ur_io: cpa=%p\n", cpa); | |
246 | ||
247 | rc = mutex_lock_interruptible(&urd->io_mutex); | |
248 | if (rc) | |
249 | return rc; | |
250 | ||
251 | urd->io_done = &event; | |
252 | ||
253 | spin_lock_irq(get_ccwdev_lock(cdev)); | |
254 | rc = ccw_device_start(cdev, cpa, 1, 0, 0); | |
255 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
256 | ||
257 | TRACE("do_ur_io: ccw_device_start returned %d\n", rc); | |
258 | if (rc) | |
259 | goto out; | |
260 | ||
261 | wait_for_completion(&event); | |
262 | TRACE("do_ur_io: I/O complete\n"); | |
263 | rc = 0; | |
264 | ||
265 | out: | |
266 | mutex_unlock(&urd->io_mutex); | |
267 | return rc; | |
268 | } | |
269 | ||
270 | /* | |
271 | * ur interrupt handler, called from the ccw_device layer | |
272 | */ | |
273 | static void ur_int_handler(struct ccw_device *cdev, unsigned long intparm, | |
274 | struct irb *irb) | |
275 | { | |
276 | struct urdev *urd; | |
277 | ||
278 | TRACE("ur_int_handler: intparm=0x%lx cstat=%02x dstat=%02x res=%u\n", | |
279 | intparm, irb->scsw.cstat, irb->scsw.dstat, irb->scsw.count); | |
280 | ||
281 | if (!intparm) { | |
282 | TRACE("ur_int_handler: unsolicited interrupt\n"); | |
283 | return; | |
284 | } | |
285 | urd = cdev->dev.driver_data; | |
8127a1f8 | 286 | BUG_ON(!urd); |
810cb5b3 FM |
287 | /* On special conditions irb is an error pointer */ |
288 | if (IS_ERR(irb)) | |
289 | urd->io_request_rc = PTR_ERR(irb); | |
290 | else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END)) | |
291 | urd->io_request_rc = 0; | |
292 | else | |
293 | urd->io_request_rc = -EIO; | |
294 | ||
295 | complete(urd->io_done); | |
296 | } | |
297 | ||
298 | /* | |
299 | * reclen sysfs attribute - The record length to be used for write CCWs | |
300 | */ | |
301 | static ssize_t ur_attr_reclen_show(struct device *dev, | |
302 | struct device_attribute *attr, char *buf) | |
303 | { | |
8127a1f8 MH |
304 | struct urdev *urd; |
305 | int rc; | |
810cb5b3 | 306 | |
8127a1f8 MH |
307 | urd = urdev_get_from_cdev(to_ccwdev(dev)); |
308 | if (!urd) | |
309 | return -ENODEV; | |
310 | rc = sprintf(buf, "%zu\n", urd->reclen); | |
311 | urdev_put(urd); | |
312 | return rc; | |
810cb5b3 FM |
313 | } |
314 | ||
315 | static DEVICE_ATTR(reclen, 0444, ur_attr_reclen_show, NULL); | |
316 | ||
317 | static int ur_create_attributes(struct device *dev) | |
318 | { | |
319 | return device_create_file(dev, &dev_attr_reclen); | |
320 | } | |
321 | ||
322 | static void ur_remove_attributes(struct device *dev) | |
323 | { | |
324 | device_remove_file(dev, &dev_attr_reclen); | |
325 | } | |
326 | ||
327 | /* | |
328 | * diagnose code 0x210 - retrieve device information | |
329 | * cc=0 normal completion, we have a real device | |
330 | * cc=1 CP paging error | |
331 | * cc=2 The virtual device exists, but is not associated with a real device | |
332 | * cc=3 Invalid device address, or the virtual device does not exist | |
333 | */ | |
334 | static int get_urd_class(struct urdev *urd) | |
335 | { | |
336 | static struct diag210 ur_diag210; | |
337 | int cc; | |
338 | ||
339 | ur_diag210.vrdcdvno = urd->dev_id.devno; | |
340 | ur_diag210.vrdclen = sizeof(struct diag210); | |
341 | ||
342 | cc = diag210(&ur_diag210); | |
343 | switch (cc) { | |
344 | case 0: | |
345 | return -ENOTSUPP; | |
346 | case 2: | |
347 | return ur_diag210.vrdcvcla; /* virtual device class */ | |
348 | case 3: | |
349 | return -ENODEV; | |
350 | default: | |
351 | return -EIO; | |
352 | } | |
353 | } | |
354 | ||
355 | /* | |
356 | * Allocation and freeing of urfile structures | |
357 | */ | |
358 | static struct urfile *urfile_alloc(struct urdev *urd) | |
359 | { | |
360 | struct urfile *urf; | |
361 | ||
362 | urf = kzalloc(sizeof(struct urfile), GFP_KERNEL); | |
363 | if (!urf) | |
364 | return NULL; | |
365 | urf->urd = urd; | |
366 | ||
367 | TRACE("urfile_alloc: urd=%p urf=%p rl=%zu\n", urd, urf, | |
368 | urf->dev_reclen); | |
369 | ||
370 | return urf; | |
371 | } | |
372 | ||
373 | static void urfile_free(struct urfile *urf) | |
374 | { | |
375 | TRACE("urfile_free: urf=%p urd=%p\n", urf, urf->urd); | |
376 | kfree(urf); | |
377 | } | |
378 | ||
379 | /* | |
380 | * The fops implementation of the character device driver | |
381 | */ | |
382 | static ssize_t do_write(struct urdev *urd, const char __user *udata, | |
383 | size_t count, size_t reclen, loff_t *ppos) | |
384 | { | |
385 | struct ccw1 *cpa; | |
810cb5b3 FM |
386 | int rc; |
387 | ||
1eade380 MH |
388 | cpa = alloc_chan_prog(udata, count / reclen, reclen); |
389 | if (IS_ERR(cpa)) | |
390 | return PTR_ERR(cpa); | |
810cb5b3 FM |
391 | |
392 | rc = do_ur_io(urd, cpa); | |
393 | if (rc) | |
394 | goto fail_kfree_cpa; | |
395 | ||
396 | if (urd->io_request_rc) { | |
397 | rc = urd->io_request_rc; | |
398 | goto fail_kfree_cpa; | |
399 | } | |
400 | *ppos += count; | |
401 | rc = count; | |
1eade380 | 402 | |
810cb5b3 | 403 | fail_kfree_cpa: |
1eade380 | 404 | free_chan_prog(cpa); |
810cb5b3 FM |
405 | return rc; |
406 | } | |
407 | ||
408 | static ssize_t ur_write(struct file *file, const char __user *udata, | |
409 | size_t count, loff_t *ppos) | |
410 | { | |
411 | struct urfile *urf = file->private_data; | |
412 | ||
413 | TRACE("ur_write: count=%zu\n", count); | |
414 | ||
415 | if (count == 0) | |
416 | return 0; | |
417 | ||
418 | if (count % urf->dev_reclen) | |
419 | return -EINVAL; /* count must be a multiple of reclen */ | |
420 | ||
421 | if (count > urf->dev_reclen * MAX_RECS_PER_IO) | |
422 | count = urf->dev_reclen * MAX_RECS_PER_IO; | |
423 | ||
424 | return do_write(urf->urd, udata, count, urf->dev_reclen, ppos); | |
425 | } | |
426 | ||
810cb5b3 FM |
427 | /* |
428 | * diagnose code 0x14 subcode 0x0028 - position spool file to designated | |
429 | * record | |
430 | * cc=0 normal completion | |
431 | * cc=2 no file active on the virtual reader or device not ready | |
432 | * cc=3 record specified is beyond EOF | |
433 | */ | |
434 | static int diag_position_to_record(int devno, int record) | |
435 | { | |
436 | int cc; | |
437 | ||
0a87c5cf | 438 | cc = diag14(record, devno, 0x28); |
810cb5b3 FM |
439 | switch (cc) { |
440 | case 0: | |
441 | return 0; | |
442 | case 2: | |
443 | return -ENOMEDIUM; | |
444 | case 3: | |
445 | return -ENODATA; /* position beyond end of file */ | |
446 | default: | |
447 | return -EIO; | |
448 | } | |
449 | } | |
450 | ||
451 | /* | |
452 | * diagnose code 0x14 subcode 0x0000 - read next spool file buffer | |
453 | * cc=0 normal completion | |
454 | * cc=1 EOF reached | |
455 | * cc=2 no file active on the virtual reader, and no file eligible | |
456 | * cc=3 file already active on the virtual reader or specified virtual | |
457 | * reader does not exist or is not a reader | |
458 | */ | |
459 | static int diag_read_file(int devno, char *buf) | |
460 | { | |
461 | int cc; | |
462 | ||
0a87c5cf | 463 | cc = diag14((unsigned long) buf, devno, 0x00); |
810cb5b3 FM |
464 | switch (cc) { |
465 | case 0: | |
466 | return 0; | |
467 | case 1: | |
468 | return -ENODATA; | |
469 | case 2: | |
470 | return -ENOMEDIUM; | |
471 | default: | |
472 | return -EIO; | |
473 | } | |
474 | } | |
475 | ||
476 | static ssize_t diag14_read(struct file *file, char __user *ubuf, size_t count, | |
477 | loff_t *offs) | |
478 | { | |
479 | size_t len, copied, res; | |
480 | char *buf; | |
481 | int rc; | |
482 | u16 reclen; | |
483 | struct urdev *urd; | |
484 | ||
485 | urd = ((struct urfile *) file->private_data)->urd; | |
486 | reclen = ((struct urfile *) file->private_data)->file_reclen; | |
487 | ||
488 | rc = diag_position_to_record(urd->dev_id.devno, *offs / PAGE_SIZE + 1); | |
489 | if (rc == -ENODATA) | |
490 | return 0; | |
491 | if (rc) | |
492 | return rc; | |
493 | ||
494 | len = min((size_t) PAGE_SIZE, count); | |
3eed13cc | 495 | buf = (char *) __get_free_page(GFP_KERNEL | GFP_DMA); |
810cb5b3 FM |
496 | if (!buf) |
497 | return -ENOMEM; | |
498 | ||
499 | copied = 0; | |
500 | res = (size_t) (*offs % PAGE_SIZE); | |
501 | do { | |
502 | rc = diag_read_file(urd->dev_id.devno, buf); | |
503 | if (rc == -ENODATA) { | |
504 | break; | |
505 | } | |
506 | if (rc) | |
507 | goto fail; | |
2b3d8c9e | 508 | if (reclen && (copied == 0) && (*offs < PAGE_SIZE)) |
810cb5b3 FM |
509 | *((u16 *) &buf[FILE_RECLEN_OFFSET]) = reclen; |
510 | len = min(count - copied, PAGE_SIZE - res); | |
511 | if (copy_to_user(ubuf + copied, buf + res, len)) { | |
512 | rc = -EFAULT; | |
513 | goto fail; | |
514 | } | |
515 | res = 0; | |
516 | copied += len; | |
517 | } while (copied != count); | |
518 | ||
519 | *offs += copied; | |
520 | rc = copied; | |
521 | fail: | |
3eed13cc | 522 | free_page((unsigned long) buf); |
810cb5b3 FM |
523 | return rc; |
524 | } | |
525 | ||
526 | static ssize_t ur_read(struct file *file, char __user *ubuf, size_t count, | |
527 | loff_t *offs) | |
528 | { | |
529 | struct urdev *urd; | |
530 | int rc; | |
531 | ||
532 | TRACE("ur_read: count=%zu ppos=%li\n", count, (unsigned long) *offs); | |
533 | ||
534 | if (count == 0) | |
535 | return 0; | |
536 | ||
537 | urd = ((struct urfile *) file->private_data)->urd; | |
538 | rc = mutex_lock_interruptible(&urd->io_mutex); | |
539 | if (rc) | |
540 | return rc; | |
541 | rc = diag14_read(file, ubuf, count, offs); | |
542 | mutex_unlock(&urd->io_mutex); | |
543 | return rc; | |
544 | } | |
545 | ||
546 | /* | |
547 | * diagnose code 0x14 subcode 0x0fff - retrieve next file descriptor | |
548 | * cc=0 normal completion | |
549 | * cc=1 no files on reader queue or no subsequent file | |
550 | * cc=2 spid specified is invalid | |
551 | */ | |
552 | static int diag_read_next_file_info(struct file_control_block *buf, int spid) | |
553 | { | |
554 | int cc; | |
555 | ||
0a87c5cf | 556 | cc = diag14((unsigned long) buf, spid, 0xfff); |
810cb5b3 FM |
557 | switch (cc) { |
558 | case 0: | |
559 | return 0; | |
560 | default: | |
561 | return -ENODATA; | |
562 | } | |
563 | } | |
564 | ||
3eed13cc | 565 | static int verify_uri_device(struct urdev *urd) |
810cb5b3 | 566 | { |
3eed13cc | 567 | struct file_control_block *fcb; |
810cb5b3 FM |
568 | char *buf; |
569 | int rc; | |
570 | ||
3eed13cc MH |
571 | fcb = kmalloc(sizeof(*fcb), GFP_KERNEL | GFP_DMA); |
572 | if (!fcb) | |
573 | return -ENOMEM; | |
574 | ||
575 | /* check for empty reader device (beginning of chain) */ | |
576 | rc = diag_read_next_file_info(fcb, 0); | |
577 | if (rc) | |
578 | goto fail_free_fcb; | |
579 | ||
580 | /* if file is in hold status, we do not read it */ | |
581 | if (fcb->file_stat & (FLG_SYSTEM_HOLD | FLG_USER_HOLD)) { | |
582 | rc = -EPERM; | |
583 | goto fail_free_fcb; | |
584 | } | |
585 | ||
586 | /* open file on virtual reader */ | |
587 | buf = (char *) __get_free_page(GFP_KERNEL | GFP_DMA); | |
588 | if (!buf) { | |
589 | rc = -ENOMEM; | |
590 | goto fail_free_fcb; | |
591 | } | |
592 | rc = diag_read_file(urd->dev_id.devno, buf); | |
593 | if ((rc != 0) && (rc != -ENODATA)) /* EOF does not hurt */ | |
594 | goto fail_free_buf; | |
595 | ||
596 | /* check if the file on top of the queue is open now */ | |
597 | rc = diag_read_next_file_info(fcb, 0); | |
598 | if (rc) | |
599 | goto fail_free_buf; | |
600 | if (!(fcb->file_stat & FLG_IN_USE)) { | |
601 | rc = -EMFILE; | |
602 | goto fail_free_buf; | |
603 | } | |
604 | rc = 0; | |
605 | ||
606 | fail_free_buf: | |
607 | free_page((unsigned long) buf); | |
608 | fail_free_fcb: | |
609 | kfree(fcb); | |
610 | return rc; | |
611 | } | |
612 | ||
613 | static int verify_device(struct urdev *urd) | |
614 | { | |
810cb5b3 FM |
615 | switch (urd->class) { |
616 | case DEV_CLASS_UR_O: | |
617 | return 0; /* no check needed here */ | |
618 | case DEV_CLASS_UR_I: | |
3eed13cc | 619 | return verify_uri_device(urd); |
810cb5b3 FM |
620 | default: |
621 | return -ENOTSUPP; | |
622 | } | |
623 | } | |
624 | ||
3eed13cc | 625 | static int get_uri_file_reclen(struct urdev *urd) |
810cb5b3 | 626 | { |
3eed13cc | 627 | struct file_control_block *fcb; |
810cb5b3 FM |
628 | int rc; |
629 | ||
3eed13cc MH |
630 | fcb = kmalloc(sizeof(*fcb), GFP_KERNEL | GFP_DMA); |
631 | if (!fcb) | |
632 | return -ENOMEM; | |
633 | rc = diag_read_next_file_info(fcb, 0); | |
634 | if (rc) | |
635 | goto fail_free; | |
636 | if (fcb->file_stat & FLG_CP_DUMP) | |
637 | rc = 0; | |
638 | else | |
639 | rc = fcb->rec_len; | |
640 | ||
641 | fail_free: | |
642 | kfree(fcb); | |
643 | return rc; | |
644 | } | |
645 | ||
646 | static int get_file_reclen(struct urdev *urd) | |
647 | { | |
810cb5b3 FM |
648 | switch (urd->class) { |
649 | case DEV_CLASS_UR_O: | |
650 | return 0; | |
651 | case DEV_CLASS_UR_I: | |
3eed13cc | 652 | return get_uri_file_reclen(urd); |
810cb5b3 FM |
653 | default: |
654 | return -ENOTSUPP; | |
655 | } | |
810cb5b3 FM |
656 | } |
657 | ||
658 | static int ur_open(struct inode *inode, struct file *file) | |
659 | { | |
660 | u16 devno; | |
661 | struct urdev *urd; | |
662 | struct urfile *urf; | |
663 | unsigned short accmode; | |
664 | int rc; | |
665 | ||
666 | accmode = file->f_flags & O_ACCMODE; | |
667 | ||
668 | if (accmode == O_RDWR) | |
669 | return -EACCES; | |
670 | ||
671 | /* | |
672 | * We treat the minor number as the devno of the ur device | |
673 | * to find in the driver tree. | |
674 | */ | |
675 | devno = MINOR(file->f_dentry->d_inode->i_rdev); | |
676 | ||
677 | urd = urdev_get_from_devno(devno); | |
678 | if (!urd) | |
679 | return -ENXIO; | |
680 | ||
681 | if (file->f_flags & O_NONBLOCK) { | |
682 | if (!mutex_trylock(&urd->open_mutex)) { | |
683 | rc = -EBUSY; | |
684 | goto fail_put; | |
685 | } | |
686 | } else { | |
687 | if (mutex_lock_interruptible(&urd->open_mutex)) { | |
688 | rc = -ERESTARTSYS; | |
689 | goto fail_put; | |
690 | } | |
691 | } | |
692 | ||
693 | TRACE("ur_open\n"); | |
694 | ||
695 | if (((accmode == O_RDONLY) && (urd->class != DEV_CLASS_UR_I)) || | |
696 | ((accmode == O_WRONLY) && (urd->class != DEV_CLASS_UR_O))) { | |
697 | TRACE("ur_open: unsupported dev class (%d)\n", urd->class); | |
698 | rc = -EACCES; | |
699 | goto fail_unlock; | |
700 | } | |
701 | ||
702 | rc = verify_device(urd); | |
703 | if (rc) | |
704 | goto fail_unlock; | |
705 | ||
706 | urf = urfile_alloc(urd); | |
707 | if (!urf) { | |
708 | rc = -ENOMEM; | |
709 | goto fail_unlock; | |
710 | } | |
711 | ||
712 | urf->dev_reclen = urd->reclen; | |
713 | rc = get_file_reclen(urd); | |
714 | if (rc < 0) | |
715 | goto fail_urfile_free; | |
716 | urf->file_reclen = rc; | |
717 | file->private_data = urf; | |
718 | return 0; | |
719 | ||
720 | fail_urfile_free: | |
721 | urfile_free(urf); | |
722 | fail_unlock: | |
723 | mutex_unlock(&urd->open_mutex); | |
724 | fail_put: | |
725 | urdev_put(urd); | |
726 | return rc; | |
727 | } | |
728 | ||
729 | static int ur_release(struct inode *inode, struct file *file) | |
730 | { | |
731 | struct urfile *urf = file->private_data; | |
732 | ||
733 | TRACE("ur_release\n"); | |
734 | mutex_unlock(&urf->urd->open_mutex); | |
735 | urdev_put(urf->urd); | |
736 | urfile_free(urf); | |
737 | return 0; | |
738 | } | |
739 | ||
740 | static loff_t ur_llseek(struct file *file, loff_t offset, int whence) | |
741 | { | |
742 | loff_t newpos; | |
743 | ||
744 | if ((file->f_flags & O_ACCMODE) != O_RDONLY) | |
745 | return -ESPIPE; /* seek allowed only for reader */ | |
746 | if (offset % PAGE_SIZE) | |
747 | return -ESPIPE; /* only multiples of 4K allowed */ | |
748 | switch (whence) { | |
749 | case 0: /* SEEK_SET */ | |
750 | newpos = offset; | |
751 | break; | |
752 | case 1: /* SEEK_CUR */ | |
753 | newpos = file->f_pos + offset; | |
754 | break; | |
755 | default: | |
756 | return -EINVAL; | |
757 | } | |
758 | file->f_pos = newpos; | |
759 | return newpos; | |
760 | } | |
761 | ||
5c81cdbe | 762 | static const struct file_operations ur_fops = { |
810cb5b3 FM |
763 | .owner = THIS_MODULE, |
764 | .open = ur_open, | |
765 | .release = ur_release, | |
766 | .read = ur_read, | |
767 | .write = ur_write, | |
768 | .llseek = ur_llseek, | |
769 | }; | |
770 | ||
771 | /* | |
772 | * ccw_device infrastructure: | |
8127a1f8 MH |
773 | * ur_probe creates the struct urdev (with refcount = 1), the device |
774 | * attributes, sets up the interrupt handler and validates the virtual | |
775 | * unit record device. | |
776 | * ur_remove removes the device attributes and drops the reference to | |
777 | * struct urdev. | |
778 | * | |
779 | * ur_probe, ur_remove, ur_set_online and ur_set_offline are serialized | |
780 | * by the vmur_mutex lock. | |
781 | * | |
782 | * urd->char_device is used as indication that the online function has | |
783 | * been completed successfully. | |
810cb5b3 FM |
784 | */ |
785 | static int ur_probe(struct ccw_device *cdev) | |
786 | { | |
787 | struct urdev *urd; | |
788 | int rc; | |
789 | ||
8127a1f8 | 790 | TRACE("ur_probe: cdev=%p\n", cdev); |
810cb5b3 | 791 | |
8127a1f8 | 792 | mutex_lock(&vmur_mutex); |
810cb5b3 FM |
793 | urd = urdev_alloc(cdev); |
794 | if (!urd) { | |
795 | rc = -ENOMEM; | |
8127a1f8 | 796 | goto fail_unlock; |
810cb5b3 | 797 | } |
8127a1f8 | 798 | |
810cb5b3 FM |
799 | rc = ur_create_attributes(&cdev->dev); |
800 | if (rc) { | |
801 | rc = -ENOMEM; | |
8127a1f8 | 802 | goto fail_urdev_put; |
810cb5b3 | 803 | } |
810cb5b3 FM |
804 | cdev->handler = ur_int_handler; |
805 | ||
806 | /* validate virtual unit record device */ | |
807 | urd->class = get_urd_class(urd); | |
808 | if (urd->class < 0) { | |
809 | rc = urd->class; | |
8127a1f8 | 810 | goto fail_remove_attr; |
810cb5b3 FM |
811 | } |
812 | if ((urd->class != DEV_CLASS_UR_I) && (urd->class != DEV_CLASS_UR_O)) { | |
813 | rc = -ENOTSUPP; | |
8127a1f8 | 814 | goto fail_remove_attr; |
810cb5b3 | 815 | } |
8127a1f8 MH |
816 | spin_lock_irq(get_ccwdev_lock(cdev)); |
817 | cdev->dev.driver_data = urd; | |
818 | spin_unlock_irq(get_ccwdev_lock(cdev)); | |
810cb5b3 | 819 | |
8127a1f8 | 820 | mutex_unlock(&vmur_mutex); |
810cb5b3 FM |
821 | return 0; |
822 | ||
8127a1f8 | 823 | fail_remove_attr: |
810cb5b3 | 824 | ur_remove_attributes(&cdev->dev); |
8127a1f8 MH |
825 | fail_urdev_put: |
826 | urdev_put(urd); | |
827 | fail_unlock: | |
828 | mutex_unlock(&vmur_mutex); | |
829 | return rc; | |
810cb5b3 FM |
830 | } |
831 | ||
832 | static int ur_set_online(struct ccw_device *cdev) | |
833 | { | |
834 | struct urdev *urd; | |
835 | int minor, major, rc; | |
836 | char node_id[16]; | |
837 | ||
8127a1f8 | 838 | TRACE("ur_set_online: cdev=%p\n", cdev); |
810cb5b3 | 839 | |
8127a1f8 MH |
840 | mutex_lock(&vmur_mutex); |
841 | urd = urdev_get_from_cdev(cdev); | |
842 | if (!urd) { | |
843 | /* ur_remove already deleted our urd */ | |
844 | rc = -ENODEV; | |
845 | goto fail_unlock; | |
846 | } | |
847 | ||
848 | if (urd->char_device) { | |
849 | /* Another ur_set_online was faster */ | |
850 | rc = -EBUSY; | |
851 | goto fail_urdev_put; | |
852 | } | |
810cb5b3 | 853 | |
810cb5b3 FM |
854 | minor = urd->dev_id.devno; |
855 | major = MAJOR(ur_first_dev_maj_min); | |
856 | ||
857 | urd->char_device = cdev_alloc(); | |
858 | if (!urd->char_device) { | |
859 | rc = -ENOMEM; | |
8127a1f8 | 860 | goto fail_urdev_put; |
810cb5b3 FM |
861 | } |
862 | ||
863 | cdev_init(urd->char_device, &ur_fops); | |
864 | urd->char_device->dev = MKDEV(major, minor); | |
865 | urd->char_device->owner = ur_fops.owner; | |
866 | ||
867 | rc = cdev_add(urd->char_device, urd->char_device->dev, 1); | |
868 | if (rc) | |
869 | goto fail_free_cdev; | |
870 | if (urd->cdev->id.cu_type == READER_PUNCH_DEVTYPE) { | |
871 | if (urd->class == DEV_CLASS_UR_I) | |
872 | sprintf(node_id, "vmrdr-%s", cdev->dev.bus_id); | |
873 | if (urd->class == DEV_CLASS_UR_O) | |
874 | sprintf(node_id, "vmpun-%s", cdev->dev.bus_id); | |
875 | } else if (urd->cdev->id.cu_type == PRINTER_DEVTYPE) { | |
876 | sprintf(node_id, "vmprt-%s", cdev->dev.bus_id); | |
877 | } else { | |
878 | rc = -ENOTSUPP; | |
879 | goto fail_free_cdev; | |
880 | } | |
881 | ||
882 | urd->device = device_create(vmur_class, NULL, urd->char_device->dev, | |
883 | "%s", node_id); | |
884 | if (IS_ERR(urd->device)) { | |
885 | rc = PTR_ERR(urd->device); | |
886 | TRACE("ur_set_online: device_create rc=%d\n", rc); | |
887 | goto fail_free_cdev; | |
888 | } | |
8127a1f8 MH |
889 | urdev_put(urd); |
890 | mutex_unlock(&vmur_mutex); | |
810cb5b3 FM |
891 | return 0; |
892 | ||
893 | fail_free_cdev: | |
894 | cdev_del(urd->char_device); | |
8127a1f8 MH |
895 | urd->char_device = NULL; |
896 | fail_urdev_put: | |
897 | urdev_put(urd); | |
898 | fail_unlock: | |
899 | mutex_unlock(&vmur_mutex); | |
810cb5b3 FM |
900 | return rc; |
901 | } | |
902 | ||
8127a1f8 | 903 | static int ur_set_offline_force(struct ccw_device *cdev, int force) |
810cb5b3 FM |
904 | { |
905 | struct urdev *urd; | |
8127a1f8 | 906 | int rc; |
810cb5b3 | 907 | |
8127a1f8 MH |
908 | TRACE("ur_set_offline: cdev=%p\n", cdev); |
909 | urd = urdev_get_from_cdev(cdev); | |
910 | if (!urd) | |
911 | /* ur_remove already deleted our urd */ | |
912 | return -ENODEV; | |
913 | if (!urd->char_device) { | |
914 | /* Another ur_set_offline was faster */ | |
915 | rc = -EBUSY; | |
916 | goto fail_urdev_put; | |
917 | } | |
918 | if (!force && (atomic_read(&urd->ref_count) > 2)) { | |
919 | /* There is still a user of urd (e.g. ur_open) */ | |
920 | TRACE("ur_set_offline: BUSY\n"); | |
921 | rc = -EBUSY; | |
922 | goto fail_urdev_put; | |
923 | } | |
810cb5b3 FM |
924 | device_destroy(vmur_class, urd->char_device->dev); |
925 | cdev_del(urd->char_device); | |
8127a1f8 MH |
926 | urd->char_device = NULL; |
927 | rc = 0; | |
810cb5b3 | 928 | |
8127a1f8 MH |
929 | fail_urdev_put: |
930 | urdev_put(urd); | |
931 | return rc; | |
932 | } | |
933 | ||
934 | static int ur_set_offline(struct ccw_device *cdev) | |
935 | { | |
936 | int rc; | |
937 | ||
938 | mutex_lock(&vmur_mutex); | |
939 | rc = ur_set_offline_force(cdev, 0); | |
940 | mutex_unlock(&vmur_mutex); | |
941 | return rc; | |
942 | } | |
943 | ||
944 | static void ur_remove(struct ccw_device *cdev) | |
945 | { | |
946 | unsigned long flags; | |
947 | ||
948 | TRACE("ur_remove\n"); | |
949 | ||
950 | mutex_lock(&vmur_mutex); | |
951 | ||
952 | if (cdev->online) | |
953 | ur_set_offline_force(cdev, 1); | |
954 | ur_remove_attributes(&cdev->dev); | |
955 | ||
956 | spin_lock_irqsave(get_ccwdev_lock(cdev), flags); | |
957 | urdev_put(cdev->dev.driver_data); | |
958 | cdev->dev.driver_data = NULL; | |
959 | spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); | |
960 | ||
961 | mutex_unlock(&vmur_mutex); | |
810cb5b3 FM |
962 | } |
963 | ||
964 | /* | |
965 | * Module initialisation and cleanup | |
966 | */ | |
967 | static int __init ur_init(void) | |
968 | { | |
969 | int rc; | |
970 | dev_t dev; | |
971 | ||
972 | if (!MACHINE_IS_VM) { | |
973 | PRINT_ERR("%s is only available under z/VM.\n", ur_banner); | |
974 | return -ENODEV; | |
975 | } | |
976 | ||
977 | vmur_dbf = debug_register("vmur", 4, 1, 4 * sizeof(long)); | |
978 | if (!vmur_dbf) | |
979 | return -ENOMEM; | |
980 | rc = debug_register_view(vmur_dbf, &debug_sprintf_view); | |
981 | if (rc) | |
982 | goto fail_free_dbf; | |
983 | ||
984 | debug_set_level(vmur_dbf, 6); | |
985 | ||
986 | rc = ccw_driver_register(&ur_driver); | |
987 | if (rc) | |
988 | goto fail_free_dbf; | |
989 | ||
990 | rc = alloc_chrdev_region(&dev, 0, NUM_MINORS, "vmur"); | |
991 | if (rc) { | |
992 | PRINT_ERR("alloc_chrdev_region failed: err = %d\n", rc); | |
993 | goto fail_unregister_driver; | |
994 | } | |
995 | ur_first_dev_maj_min = MKDEV(MAJOR(dev), 0); | |
996 | ||
997 | vmur_class = class_create(THIS_MODULE, "vmur"); | |
998 | if (IS_ERR(vmur_class)) { | |
999 | rc = PTR_ERR(vmur_class); | |
1000 | goto fail_unregister_region; | |
1001 | } | |
1002 | PRINT_INFO("%s loaded.\n", ur_banner); | |
1003 | return 0; | |
1004 | ||
1005 | fail_unregister_region: | |
1006 | unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS); | |
1007 | fail_unregister_driver: | |
1008 | ccw_driver_unregister(&ur_driver); | |
1009 | fail_free_dbf: | |
1010 | debug_unregister(vmur_dbf); | |
1011 | return rc; | |
1012 | } | |
1013 | ||
1014 | static void __exit ur_exit(void) | |
1015 | { | |
1016 | class_destroy(vmur_class); | |
1017 | unregister_chrdev_region(ur_first_dev_maj_min, NUM_MINORS); | |
1018 | ccw_driver_unregister(&ur_driver); | |
1019 | debug_unregister(vmur_dbf); | |
1020 | PRINT_INFO("%s unloaded.\n", ur_banner); | |
1021 | } | |
1022 | ||
1023 | module_init(ur_init); | |
1024 | module_exit(ur_exit); |