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[POWERPC] kprobes: Fix possible system crash during out-of-line single-stepping
[linux-2.6/openmoko-kernel/knife-kernel.git] / drivers / cdrom / viocd.c
blob54ca931e19ea0a0c0b36bc896432278dc1361812
1 /* -*- linux-c -*-
2 * drivers/cdrom/viocd.c
3 *
4 * iSeries Virtual CD Rom
5 *
6 * Authors: Dave Boutcher <boutcher@us.ibm.com>
7 * Ryan Arnold <ryanarn@us.ibm.com>
8 * Colin Devilbiss <devilbis@us.ibm.com>
9 * Stephen Rothwell <sfr@au1.ibm.com>
10 *
11 * (C) Copyright 2000-2004 IBM Corporation
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License as
15 * published by the Free Software Foundation; either version 2 of the
16 * License, or (at your option) anyu later version.
17 *
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software Foundation,
25 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 *
27 * This routine provides access to CD ROM drives owned and managed by an
28 * OS/400 partition running on the same box as this Linux partition.
29 *
30 * All operations are performed by sending messages back and forth to
31 * the OS/400 partition.
32 */
33
34 #include <linux/major.h>
35 #include <linux/blkdev.h>
36 #include <linux/cdrom.h>
37 #include <linux/errno.h>
38 #include <linux/init.h>
39 #include <linux/dma-mapping.h>
40 #include <linux/module.h>
41 #include <linux/completion.h>
42 #include <linux/proc_fs.h>
43 #include <linux/seq_file.h>
44
45 #include <asm/vio.h>
46 #include <asm/scatterlist.h>
47 #include <asm/iseries/hv_types.h>
48 #include <asm/iseries/hv_lp_event.h>
49 #include <asm/iseries/vio.h>
50
51 #define VIOCD_DEVICE "iseries/vcd"
52
53 #define VIOCD_VERS "1.06"
54
55 #define VIOCD_KERN_WARNING KERN_WARNING "viocd: "
56 #define VIOCD_KERN_INFO KERN_INFO "viocd: "
57
58 struct viocdlpevent {
59 struct HvLpEvent event;
60 u32 reserved;
61 u16 version;
62 u16 sub_result;
63 u16 disk;
64 u16 flags;
65 u32 token;
66 u64 offset; /* On open, max number of disks */
67 u64 len; /* On open, size of the disk */
68 u32 block_size; /* Only set on open */
69 u32 media_size; /* Only set on open */
70 };
71
72 enum viocdsubtype {
73 viocdopen = 0x0001,
74 viocdclose = 0x0002,
75 viocdread = 0x0003,
76 viocdwrite = 0x0004,
77 viocdlockdoor = 0x0005,
78 viocdgetinfo = 0x0006,
79 viocdcheck = 0x0007
80 };
81
82 /*
83 * Should probably make this a module parameter....sigh
84 */
85 #define VIOCD_MAX_CD HVMAXARCHITECTEDVIRTUALCDROMS
86
87 static const struct vio_error_entry viocd_err_table[] = {
88 {0x0201, EINVAL, "Invalid Range"},
89 {0x0202, EINVAL, "Invalid Token"},
90 {0x0203, EIO, "DMA Error"},
91 {0x0204, EIO, "Use Error"},
92 {0x0205, EIO, "Release Error"},
93 {0x0206, EINVAL, "Invalid CD"},
94 {0x020C, EROFS, "Read Only Device"},
95 {0x020D, ENOMEDIUM, "Changed or Missing Volume (or Varied Off?)"},
96 {0x020E, EIO, "Optical System Error (Varied Off?)"},
97 {0x02FF, EIO, "Internal Error"},
98 {0x3010, EIO, "Changed Volume"},
99 {0xC100, EIO, "Optical System Error"},
100 {0x0000, 0, NULL},
101 };
102
103 /*
104 * This is the structure we use to exchange info between driver and interrupt
105 * handler
106 */
107 struct viocd_waitevent {
108 struct completion com;
109 int rc;
110 u16 sub_result;
111 int changed;
112 };
113
114 /* this is a lookup table for the true capabilities of a device */
115 struct capability_entry {
116 char *type;
117 int capability;
118 };
119
120 static struct capability_entry capability_table[] __initdata = {
121 { "6330", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
122 { "6331", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
123 { "6333", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
124 { "632A", CDC_LOCK | CDC_DVD_RAM | CDC_RAM },
125 { "6321", CDC_LOCK },
126 { "632B", 0 },
127 { NULL , CDC_LOCK },
128 };
129
130 /* These are our internal structures for keeping track of devices */
131 static int viocd_numdev;
132
133 struct cdrom_info {
134 char rsrcname[10];
135 char type[4];
136 char model[3];
137 };
138 /*
139 * This needs to be allocated since it is passed to the
140 * Hypervisor and we may be a module.
141 */
142 static struct cdrom_info *viocd_unitinfo;
143 static dma_addr_t unitinfo_dmaaddr;
144
145 struct disk_info {
146 struct gendisk *viocd_disk;
147 struct cdrom_device_info viocd_info;
148 struct device *dev;
149 };
150 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
151
152 #define DEVICE_NR(di) ((di) - &viocd_diskinfo[0])
153
154 static spinlock_t viocd_reqlock;
155
156 #define MAX_CD_REQ 1
157
158 /* procfs support */
159 static int proc_viocd_show(struct seq_file *m, void *v)
160 {
161 int i;
162
163 for (i = 0; i < viocd_numdev; i++) {
164 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
165 "type %4.4s, model %3.3s\n",
166 i, viocd_unitinfo[i].rsrcname,
167 viocd_unitinfo[i].type,
168 viocd_unitinfo[i].model);
169 }
170 return 0;
171 }
172
173 static int proc_viocd_open(struct inode *inode, struct file *file)
174 {
175 return single_open(file, proc_viocd_show, NULL);
176 }
177
178 static struct file_operations proc_viocd_operations = {
179 .open = proc_viocd_open,
180 .read = seq_read,
181 .llseek = seq_lseek,
182 .release = single_release,
183 };
184
185 static int viocd_blk_open(struct inode *inode, struct file *file)
186 {
187 struct disk_info *di = inode->i_bdev->bd_disk->private_data;
188 return cdrom_open(&di->viocd_info, inode, file);
189 }
190
191 static int viocd_blk_release(struct inode *inode, struct file *file)
192 {
193 struct disk_info *di = inode->i_bdev->bd_disk->private_data;
194 return cdrom_release(&di->viocd_info, file);
195 }
196
197 static int viocd_blk_ioctl(struct inode *inode, struct file *file,
198 unsigned cmd, unsigned long arg)
199 {
200 struct disk_info *di = inode->i_bdev->bd_disk->private_data;
201 return cdrom_ioctl(file, &di->viocd_info, inode, cmd, arg);
202 }
203
204 static int viocd_blk_media_changed(struct gendisk *disk)
205 {
206 struct disk_info *di = disk->private_data;
207 return cdrom_media_changed(&di->viocd_info);
208 }
209
210 struct block_device_operations viocd_fops = {
211 .owner = THIS_MODULE,
212 .open = viocd_blk_open,
213 .release = viocd_blk_release,
214 .ioctl = viocd_blk_ioctl,
215 .media_changed = viocd_blk_media_changed,
216 };
217
218 /* Get info on CD devices from OS/400 */
219 static void __init get_viocd_info(void)
220 {
221 HvLpEvent_Rc hvrc;
222 int i;
223 struct viocd_waitevent we;
224
225 viocd_unitinfo = dma_alloc_coherent(iSeries_vio_dev,
226 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
227 &unitinfo_dmaaddr, GFP_ATOMIC);
228 if (viocd_unitinfo == NULL) {
229 printk(VIOCD_KERN_WARNING "error allocating unitinfo\n");
230 return;
231 }
232
233 memset(viocd_unitinfo, 0, sizeof(*viocd_unitinfo) * VIOCD_MAX_CD);
234
235 init_completion(&we.com);
236
237 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
238 HvLpEvent_Type_VirtualIo,
239 viomajorsubtype_cdio | viocdgetinfo,
240 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
241 viopath_sourceinst(viopath_hostLp),
242 viopath_targetinst(viopath_hostLp),
243 (u64)&we, VIOVERSION << 16, unitinfo_dmaaddr, 0,
244 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD, 0);
245 if (hvrc != HvLpEvent_Rc_Good) {
246 printk(VIOCD_KERN_WARNING "cdrom error sending event. rc %d\n",
247 (int)hvrc);
248 goto error_ret;
249 }
250
251 wait_for_completion(&we.com);
252
253 if (we.rc) {
254 const struct vio_error_entry *err =
255 vio_lookup_rc(viocd_err_table, we.sub_result);
256 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on getinfo: %s\n",
257 we.rc, we.sub_result, err->msg);
258 goto error_ret;
259 }
260
261 for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++)
262 viocd_numdev++;
263
264 error_ret:
265 if (viocd_numdev == 0) {
266 dma_free_coherent(iSeries_vio_dev,
267 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
268 viocd_unitinfo, unitinfo_dmaaddr);
269 viocd_unitinfo = NULL;
270 }
271 }
272
273 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
274 {
275 struct disk_info *diskinfo = cdi->handle;
276 int device_no = DEVICE_NR(diskinfo);
277 HvLpEvent_Rc hvrc;
278 struct viocd_waitevent we;
279
280 init_completion(&we.com);
281 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
282 HvLpEvent_Type_VirtualIo,
283 viomajorsubtype_cdio | viocdopen,
284 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
285 viopath_sourceinst(viopath_hostLp),
286 viopath_targetinst(viopath_hostLp),
287 (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
288 0, 0, 0);
289 if (hvrc != 0) {
290 printk(VIOCD_KERN_WARNING
291 "bad rc on HvCallEvent_signalLpEventFast %d\n",
292 (int)hvrc);
293 return -EIO;
294 }
295
296 wait_for_completion(&we.com);
297
298 if (we.rc) {
299 const struct vio_error_entry *err =
300 vio_lookup_rc(viocd_err_table, we.sub_result);
301 printk(VIOCD_KERN_WARNING "bad rc %d:0x%04X on open: %s\n",
302 we.rc, we.sub_result, err->msg);
303 return -err->errno;
304 }
305
306 return 0;
307 }
308
309 static void viocd_release(struct cdrom_device_info *cdi)
310 {
311 int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
312 HvLpEvent_Rc hvrc;
313
314 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
315 HvLpEvent_Type_VirtualIo,
316 viomajorsubtype_cdio | viocdclose,
317 HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
318 viopath_sourceinst(viopath_hostLp),
319 viopath_targetinst(viopath_hostLp), 0,
320 VIOVERSION << 16, ((u64)device_no << 48), 0, 0, 0);
321 if (hvrc != 0)
322 printk(VIOCD_KERN_WARNING
323 "bad rc on HvCallEvent_signalLpEventFast %d\n",
324 (int)hvrc);
325 }
326
327 /* Send a read or write request to OS/400 */
328 static int send_request(struct request *req)
329 {
330 HvLpEvent_Rc hvrc;
331 struct disk_info *diskinfo = req->rq_disk->private_data;
332 u64 len;
333 dma_addr_t dmaaddr;
334 int direction;
335 u16 cmd;
336 struct scatterlist sg;
337
338 BUG_ON(req->nr_phys_segments > 1);
339
340 if (rq_data_dir(req) == READ) {
341 direction = DMA_FROM_DEVICE;
342 cmd = viomajorsubtype_cdio | viocdread;
343 } else {
344 direction = DMA_TO_DEVICE;
345 cmd = viomajorsubtype_cdio | viocdwrite;
346 }
347
348 if (blk_rq_map_sg(req->q, req, &sg) == 0) {
349 printk(VIOCD_KERN_WARNING
350 "error setting up scatter/gather list\n");
351 return -1;
352 }
353
354 if (dma_map_sg(diskinfo->dev, &sg, 1, direction) == 0) {
355 printk(VIOCD_KERN_WARNING "error allocating sg tce\n");
356 return -1;
357 }
358 dmaaddr = sg_dma_address(&sg);
359 len = sg_dma_len(&sg);
360
361 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
362 HvLpEvent_Type_VirtualIo, cmd,
363 HvLpEvent_AckInd_DoAck,
364 HvLpEvent_AckType_ImmediateAck,
365 viopath_sourceinst(viopath_hostLp),
366 viopath_targetinst(viopath_hostLp),
367 (u64)req, VIOVERSION << 16,
368 ((u64)DEVICE_NR(diskinfo) << 48) | dmaaddr,
369 (u64)req->sector * 512, len, 0);
370 if (hvrc != HvLpEvent_Rc_Good) {
371 printk(VIOCD_KERN_WARNING "hv error on op %d\n", (int)hvrc);
372 return -1;
373 }
374
375 return 0;
376 }
377
378
379 static int rwreq;
380
381 static void do_viocd_request(request_queue_t *q)
382 {
383 struct request *req;
384
385 while ((rwreq == 0) && ((req = elv_next_request(q)) != NULL)) {
386 if (!blk_fs_request(req))
387 end_request(req, 0);
388 else if (send_request(req) < 0) {
389 printk(VIOCD_KERN_WARNING
390 "unable to send message to OS/400!");
391 end_request(req, 0);
392 } else
393 rwreq++;
394 }
395 }
396
397 static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
398 {
399 struct viocd_waitevent we;
400 HvLpEvent_Rc hvrc;
401 int device_no = DEVICE_NR((struct disk_info *)cdi->handle);
402
403 init_completion(&we.com);
404
405 /* Send the open event to OS/400 */
406 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
407 HvLpEvent_Type_VirtualIo,
408 viomajorsubtype_cdio | viocdcheck,
409 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
410 viopath_sourceinst(viopath_hostLp),
411 viopath_targetinst(viopath_hostLp),
412 (u64)&we, VIOVERSION << 16, ((u64)device_no << 48),
413 0, 0, 0);
414 if (hvrc != 0) {
415 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
416 (int)hvrc);
417 return -EIO;
418 }
419
420 wait_for_completion(&we.com);
421
422 /* Check the return code. If bad, assume no change */
423 if (we.rc) {
424 const struct vio_error_entry *err =
425 vio_lookup_rc(viocd_err_table, we.sub_result);
426 printk(VIOCD_KERN_WARNING
427 "bad rc %d:0x%04X on check_change: %s; Assuming no change\n",
428 we.rc, we.sub_result, err->msg);
429 return 0;
430 }
431
432 return we.changed;
433 }
434
435 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
436 {
437 HvLpEvent_Rc hvrc;
438 u64 device_no = DEVICE_NR((struct disk_info *)cdi->handle);
439 /* NOTE: flags is 1 or 0 so it won't overwrite the device_no */
440 u64 flags = !!locking;
441 struct viocd_waitevent we;
442
443 init_completion(&we.com);
444
445 /* Send the lockdoor event to OS/400 */
446 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
447 HvLpEvent_Type_VirtualIo,
448 viomajorsubtype_cdio | viocdlockdoor,
449 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
450 viopath_sourceinst(viopath_hostLp),
451 viopath_targetinst(viopath_hostLp),
452 (u64)&we, VIOVERSION << 16,
453 (device_no << 48) | (flags << 32), 0, 0, 0);
454 if (hvrc != 0) {
455 printk(VIOCD_KERN_WARNING "bad rc on HvCallEvent_signalLpEventFast %d\n",
456 (int)hvrc);
457 return -EIO;
458 }
459
460 wait_for_completion(&we.com);
461
462 if (we.rc != 0)
463 return -EIO;
464 return 0;
465 }
466
467 static int viocd_packet(struct cdrom_device_info *cdi,
468 struct packet_command *cgc)
469 {
470 unsigned int buflen = cgc->buflen;
471 int ret = -EIO;
472
473 switch (cgc->cmd[0]) {
474 case GPCMD_READ_DISC_INFO:
475 {
476 disc_information *di = (disc_information *)cgc->buffer;
477
478 if (buflen >= 2) {
479 di->disc_information_length = cpu_to_be16(1);
480 ret = 0;
481 }
482 if (buflen >= 3)
483 di->erasable =
484 (cdi->ops->capability & ~cdi->mask
485 & (CDC_DVD_RAM | CDC_RAM)) != 0;
486 }
487 break;
488 case GPCMD_GET_CONFIGURATION:
489 if (cgc->cmd[3] == CDF_RWRT) {
490 struct rwrt_feature_desc *rfd = (struct rwrt_feature_desc *)(cgc->buffer + sizeof(struct feature_header));
491
492 if ((buflen >=
493 (sizeof(struct feature_header) + sizeof(*rfd))) &&
494 (cdi->ops->capability & ~cdi->mask
495 & (CDC_DVD_RAM | CDC_RAM))) {
496 rfd->feature_code = cpu_to_be16(CDF_RWRT);
497 rfd->curr = 1;
498 ret = 0;
499 }
500 }
501 break;
502 default:
503 if (cgc->sense) {
504 /* indicate Unknown code */
505 cgc->sense->sense_key = 0x05;
506 cgc->sense->asc = 0x20;
507 cgc->sense->ascq = 0x00;
508 }
509 break;
510 }
511
512 cgc->stat = ret;
513 return ret;
514 }
515
516 static void restart_all_queues(int first_index)
517 {
518 int i;
519
520 for (i = first_index + 1; i < viocd_numdev; i++)
521 if (viocd_diskinfo[i].viocd_disk)
522 blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
523 for (i = 0; i <= first_index; i++)
524 if (viocd_diskinfo[i].viocd_disk)
525 blk_run_queue(viocd_diskinfo[i].viocd_disk->queue);
526 }
527
528 /* This routine handles incoming CD LP events */
529 static void vio_handle_cd_event(struct HvLpEvent *event)
530 {
531 struct viocdlpevent *bevent;
532 struct viocd_waitevent *pwe;
533 struct disk_info *di;
534 unsigned long flags;
535 struct request *req;
536
537
538 if (event == NULL)
539 /* Notification that a partition went away! */
540 return;
541 /* First, we should NEVER get an int here...only acks */
542 if (hvlpevent_is_int(event)) {
543 printk(VIOCD_KERN_WARNING
544 "Yikes! got an int in viocd event handler!\n");
545 if (hvlpevent_need_ack(event)) {
546 event->xRc = HvLpEvent_Rc_InvalidSubtype;
547 HvCallEvent_ackLpEvent(event);
548 }
549 }
550
551 bevent = (struct viocdlpevent *)event;
552
553 switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
554 case viocdopen:
555 if (event->xRc == 0) {
556 di = &viocd_diskinfo[bevent->disk];
557 blk_queue_hardsect_size(di->viocd_disk->queue,
558 bevent->block_size);
559 set_capacity(di->viocd_disk,
560 bevent->media_size *
561 bevent->block_size / 512);
562 }
563 /* FALLTHROUGH !! */
564 case viocdgetinfo:
565 case viocdlockdoor:
566 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
567 return_complete:
568 pwe->rc = event->xRc;
569 pwe->sub_result = bevent->sub_result;
570 complete(&pwe->com);
571 break;
572
573 case viocdcheck:
574 pwe = (struct viocd_waitevent *)event->xCorrelationToken;
575 pwe->changed = bevent->flags;
576 goto return_complete;
577
578 case viocdclose:
579 break;
580
581 case viocdwrite:
582 case viocdread:
583 /*
584 * Since this is running in interrupt mode, we need to
585 * make sure we're not stepping on any global I/O operations
586 */
587 di = &viocd_diskinfo[bevent->disk];
588 spin_lock_irqsave(&viocd_reqlock, flags);
589 dma_unmap_single(di->dev, bevent->token, bevent->len,
590 ((event->xSubtype & VIOMINOR_SUBTYPE_MASK) == viocdread)
591 ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
592 req = (struct request *)bevent->event.xCorrelationToken;
593 rwreq--;
594
595 if (event->xRc != HvLpEvent_Rc_Good) {
596 const struct vio_error_entry *err =
597 vio_lookup_rc(viocd_err_table,
598 bevent->sub_result);
599 printk(VIOCD_KERN_WARNING "request %p failed "
600 "with rc %d:0x%04X: %s\n",
601 req, event->xRc,
602 bevent->sub_result, err->msg);
603 end_request(req, 0);
604 } else
605 end_request(req, 1);
606
607 /* restart handling of incoming requests */
608 spin_unlock_irqrestore(&viocd_reqlock, flags);
609 restart_all_queues(bevent->disk);
610 break;
611
612 default:
613 printk(VIOCD_KERN_WARNING
614 "message with invalid subtype %0x04X!\n",
615 event->xSubtype & VIOMINOR_SUBTYPE_MASK);
616 if (hvlpevent_need_ack(event)) {
617 event->xRc = HvLpEvent_Rc_InvalidSubtype;
618 HvCallEvent_ackLpEvent(event);
619 }
620 }
621 }
622
623 static struct cdrom_device_ops viocd_dops = {
624 .open = viocd_open,
625 .release = viocd_release,
626 .media_changed = viocd_media_changed,
627 .lock_door = viocd_lock_door,
628 .generic_packet = viocd_packet,
629 .capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_GENERIC_PACKET | CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_RAM
630 };
631
632 static int __init find_capability(const char *type)
633 {
634 struct capability_entry *entry;
635
636 for(entry = capability_table; entry->type; ++entry)
637 if(!strncmp(entry->type, type, 4))
638 break;
639 return entry->capability;
640 }
641
642 static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
643 {
644 struct gendisk *gendisk;
645 int deviceno;
646 struct disk_info *d;
647 struct cdrom_device_info *c;
648 struct cdrom_info *ci;
649 struct request_queue *q;
650
651 deviceno = vdev->unit_address;
652 if (deviceno >= viocd_numdev)
653 return -ENODEV;
654
655 d = &viocd_diskinfo[deviceno];
656 c = &d->viocd_info;
657 ci = &viocd_unitinfo[deviceno];
658
659 c->ops = &viocd_dops;
660 c->speed = 4;
661 c->capacity = 1;
662 c->handle = d;
663 c->mask = ~find_capability(ci->type);
664 sprintf(c->name, VIOCD_DEVICE "%c", 'a' + deviceno);
665
666 if (register_cdrom(c) != 0) {
667 printk(VIOCD_KERN_WARNING "Cannot register viocd CD-ROM %s!\n",
668 c->name);
669 goto out;
670 }
671 printk(VIOCD_KERN_INFO "cd %s is iSeries resource %10.10s "
672 "type %4.4s, model %3.3s\n",
673 c->name, ci->rsrcname, ci->type, ci->model);
674 q = blk_init_queue(do_viocd_request, &viocd_reqlock);
675 if (q == NULL) {
676 printk(VIOCD_KERN_WARNING "Cannot allocate queue for %s!\n",
677 c->name);
678 goto out_unregister_cdrom;
679 }
680 gendisk = alloc_disk(1);
681 if (gendisk == NULL) {
682 printk(VIOCD_KERN_WARNING "Cannot create gendisk for %s!\n",
683 c->name);
684 goto out_cleanup_queue;
685 }
686 gendisk->major = VIOCD_MAJOR;
687 gendisk->first_minor = deviceno;
688 strncpy(gendisk->disk_name, c->name,
689 sizeof(gendisk->disk_name));
690 blk_queue_max_hw_segments(q, 1);
691 blk_queue_max_phys_segments(q, 1);
692 blk_queue_max_sectors(q, 4096 / 512);
693 gendisk->queue = q;
694 gendisk->fops = &viocd_fops;
695 gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
696 set_capacity(gendisk, 0);
697 gendisk->private_data = d;
698 d->viocd_disk = gendisk;
699 d->dev = &vdev->dev;
700 gendisk->driverfs_dev = d->dev;
701 add_disk(gendisk);
702 return 0;
703
704 out_cleanup_queue:
705 blk_cleanup_queue(q);
706 out_unregister_cdrom:
707 unregister_cdrom(c);
708 out:
709 return -ENODEV;
710 }
711
712 static int viocd_remove(struct vio_dev *vdev)
713 {
714 struct disk_info *d = &viocd_diskinfo[vdev->unit_address];
715
716 if (unregister_cdrom(&d->viocd_info) != 0)
717 printk(VIOCD_KERN_WARNING
718 "Cannot unregister viocd CD-ROM %s!\n",
719 d->viocd_info.name);
720 del_gendisk(d->viocd_disk);
721 blk_cleanup_queue(d->viocd_disk->queue);
722 put_disk(d->viocd_disk);
723 return 0;
724 }
725
726 /**
727 * viocd_device_table: Used by vio.c to match devices that we
728 * support.
729 */
730 static struct vio_device_id viocd_device_table[] __devinitdata = {
731 { "block", "IBM,iSeries-viocd" },
732 { "", "" }
733 };
734 MODULE_DEVICE_TABLE(vio, viocd_device_table);
735
736 static struct vio_driver viocd_driver = {
737 .id_table = viocd_device_table,
738 .probe = viocd_probe,
739 .remove = viocd_remove,
740 .driver = {
741 .name = "viocd",
742 .owner = THIS_MODULE,
743 }
744 };
745
746 static int __init viocd_init(void)
747 {
748 struct proc_dir_entry *e;
749 int ret = 0;
750
751 if (viopath_hostLp == HvLpIndexInvalid) {
752 vio_set_hostlp();
753 /* If we don't have a host, bail out */
754 if (viopath_hostLp == HvLpIndexInvalid)
755 return -ENODEV;
756 }
757
758 printk(VIOCD_KERN_INFO "vers " VIOCD_VERS ", hosting partition %d\n",
759 viopath_hostLp);
760
761 if (register_blkdev(VIOCD_MAJOR, VIOCD_DEVICE) != 0) {
762 printk(VIOCD_KERN_WARNING "Unable to get major %d for %s\n",
763 VIOCD_MAJOR, VIOCD_DEVICE);
764 return -EIO;
765 }
766
767 ret = viopath_open(viopath_hostLp, viomajorsubtype_cdio,
768 MAX_CD_REQ + 2);
769 if (ret) {
770 printk(VIOCD_KERN_WARNING
771 "error opening path to host partition %d\n",
772 viopath_hostLp);
773 goto out_unregister;
774 }
775
776 /* Initialize our request handler */
777 vio_setHandler(viomajorsubtype_cdio, vio_handle_cd_event);
778
779 get_viocd_info();
780
781 spin_lock_init(&viocd_reqlock);
782
783 ret = vio_register_driver(&viocd_driver);
784 if (ret)
785 goto out_free_info;
786
787 e = create_proc_entry("iSeries/viocd", S_IFREG|S_IRUGO, NULL);
788 if (e) {
789 e->owner = THIS_MODULE;
790 e->proc_fops = &proc_viocd_operations;
791 }
792
793 return 0;
794
795 out_free_info:
796 dma_free_coherent(iSeries_vio_dev,
797 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
798 viocd_unitinfo, unitinfo_dmaaddr);
799 vio_clearHandler(viomajorsubtype_cdio);
800 viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
801 out_unregister:
802 unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
803 return ret;
804 }
805
806 static void __exit viocd_exit(void)
807 {
808 remove_proc_entry("iSeries/viocd", NULL);
809 vio_unregister_driver(&viocd_driver);
810 if (viocd_unitinfo != NULL)
811 dma_free_coherent(iSeries_vio_dev,
812 sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
813 viocd_unitinfo, unitinfo_dmaaddr);
814 viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
815 vio_clearHandler(viomajorsubtype_cdio);
816 unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);
817 }
818
819 module_init(viocd_init);
820 module_exit(viocd_exit);
821 MODULE_LICENSE("GPL");
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