[POWERPC] Fix viodasd geometry calculations
[wandboard.git] / drivers / block / viodasd.c
blobdae39911a11dd37a93c7c0323423c0d78357a563
1 /* -*- linux-c -*-
2 * viodasd.c
3 * Authors: Dave Boutcher <boutcher@us.ibm.com>
4 * Ryan Arnold <ryanarn@us.ibm.com>
5 * Colin Devilbiss <devilbis@us.ibm.com>
6 * Stephen Rothwell <sfr@au1.ibm.com>
8 * (C) Copyright 2000-2004 IBM Corporation
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of the
13 * License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 * This routine provides access to disk space (termed "DASD" in historical
25 * IBM terms) owned and managed by an OS/400 partition running on the
26 * same box as this Linux partition.
28 * All disk operations are performed by sending messages back and forth to
29 * the OS/400 partition.
31 #include <linux/major.h>
32 #include <linux/fs.h>
33 #include <linux/module.h>
34 #include <linux/kernel.h>
35 #include <linux/blkdev.h>
36 #include <linux/genhd.h>
37 #include <linux/hdreg.h>
38 #include <linux/errno.h>
39 #include <linux/init.h>
40 #include <linux/string.h>
41 #include <linux/dma-mapping.h>
42 #include <linux/completion.h>
43 #include <linux/device.h>
44 #include <linux/kernel.h>
46 #include <asm/uaccess.h>
47 #include <asm/vio.h>
48 #include <asm/iseries/hv_types.h>
49 #include <asm/iseries/hv_lp_event.h>
50 #include <asm/iseries/hv_lp_config.h>
51 #include <asm/iseries/vio.h>
52 #include <asm/firmware.h>
54 MODULE_DESCRIPTION("iSeries Virtual DASD");
55 MODULE_AUTHOR("Dave Boutcher");
56 MODULE_LICENSE("GPL");
59 * We only support 7 partitions per physical disk....so with minor
60 * numbers 0-255 we get a maximum of 32 disks.
62 #define VIOD_GENHD_NAME "iseries/vd"
64 #define VIOD_VERS "1.64"
66 #define VIOD_KERN_WARNING KERN_WARNING "viod: "
67 #define VIOD_KERN_INFO KERN_INFO "viod: "
69 enum {
70 PARTITION_SHIFT = 3,
71 MAX_DISKNO = HVMAXARCHITECTEDVIRTUALDISKS,
72 MAX_DISK_NAME = sizeof(((struct gendisk *)0)->disk_name)
75 static DEFINE_SPINLOCK(viodasd_spinlock);
77 #define VIOMAXREQ 16
78 #define VIOMAXBLOCKDMA 12
80 #define DEVICE_NO(cell) ((struct viodasd_device *)(cell) - &viodasd_devices[0])
82 struct open_data {
83 u64 disk_size;
84 u16 max_disk;
85 u16 cylinders;
86 u16 tracks;
87 u16 sectors;
88 u16 bytes_per_sector;
91 struct rw_data {
92 u64 offset;
93 struct {
94 u32 token;
95 u32 reserved;
96 u64 len;
97 } dma_info[VIOMAXBLOCKDMA];
100 struct vioblocklpevent {
101 struct HvLpEvent event;
102 u32 reserved;
103 u16 version;
104 u16 sub_result;
105 u16 disk;
106 u16 flags;
107 union {
108 struct open_data open_data;
109 struct rw_data rw_data;
110 u64 changed;
111 } u;
114 #define vioblockflags_ro 0x0001
116 enum vioblocksubtype {
117 vioblockopen = 0x0001,
118 vioblockclose = 0x0002,
119 vioblockread = 0x0003,
120 vioblockwrite = 0x0004,
121 vioblockflush = 0x0005,
122 vioblockcheck = 0x0007
125 struct viodasd_waitevent {
126 struct completion com;
127 int rc;
128 u16 sub_result;
129 int max_disk; /* open */
132 static const struct vio_error_entry viodasd_err_table[] = {
133 { 0x0201, EINVAL, "Invalid Range" },
134 { 0x0202, EINVAL, "Invalid Token" },
135 { 0x0203, EIO, "DMA Error" },
136 { 0x0204, EIO, "Use Error" },
137 { 0x0205, EIO, "Release Error" },
138 { 0x0206, EINVAL, "Invalid Disk" },
139 { 0x0207, EBUSY, "Cant Lock" },
140 { 0x0208, EIO, "Already Locked" },
141 { 0x0209, EIO, "Already Unlocked" },
142 { 0x020A, EIO, "Invalid Arg" },
143 { 0x020B, EIO, "Bad IFS File" },
144 { 0x020C, EROFS, "Read Only Device" },
145 { 0x02FF, EIO, "Internal Error" },
146 { 0x0000, 0, NULL },
150 * Figure out the biggest I/O request (in sectors) we can accept
152 #define VIODASD_MAXSECTORS (4096 / 512 * VIOMAXBLOCKDMA)
155 * Number of disk I/O requests we've sent to OS/400
157 static int num_req_outstanding;
160 * This is our internal structure for keeping track of disk devices
162 struct viodasd_device {
163 u16 cylinders;
164 u16 tracks;
165 u16 sectors;
166 u16 bytes_per_sector;
167 u64 size;
168 int read_only;
169 spinlock_t q_lock;
170 struct gendisk *disk;
171 struct device *dev;
172 } viodasd_devices[MAX_DISKNO];
175 * External open entry point.
177 static int viodasd_open(struct inode *ino, struct file *fil)
179 struct viodasd_device *d = ino->i_bdev->bd_disk->private_data;
180 HvLpEvent_Rc hvrc;
181 struct viodasd_waitevent we;
182 u16 flags = 0;
184 if (d->read_only) {
185 if ((fil != NULL) && (fil->f_mode & FMODE_WRITE))
186 return -EROFS;
187 flags = vioblockflags_ro;
190 init_completion(&we.com);
192 /* Send the open event to OS/400 */
193 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
194 HvLpEvent_Type_VirtualIo,
195 viomajorsubtype_blockio | vioblockopen,
196 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
197 viopath_sourceinst(viopath_hostLp),
198 viopath_targetinst(viopath_hostLp),
199 (u64)(unsigned long)&we, VIOVERSION << 16,
200 ((u64)DEVICE_NO(d) << 48) | ((u64)flags << 32),
201 0, 0, 0);
202 if (hvrc != 0) {
203 printk(VIOD_KERN_WARNING "HV open failed %d\n", (int)hvrc);
204 return -EIO;
207 wait_for_completion(&we.com);
209 /* Check the return code */
210 if (we.rc != 0) {
211 const struct vio_error_entry *err =
212 vio_lookup_rc(viodasd_err_table, we.sub_result);
214 printk(VIOD_KERN_WARNING
215 "bad rc opening disk: %d:0x%04x (%s)\n",
216 (int)we.rc, we.sub_result, err->msg);
217 return -EIO;
220 return 0;
224 * External release entry point.
226 static int viodasd_release(struct inode *ino, struct file *fil)
228 struct viodasd_device *d = ino->i_bdev->bd_disk->private_data;
229 HvLpEvent_Rc hvrc;
231 /* Send the event to OS/400. We DON'T expect a response */
232 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
233 HvLpEvent_Type_VirtualIo,
234 viomajorsubtype_blockio | vioblockclose,
235 HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
236 viopath_sourceinst(viopath_hostLp),
237 viopath_targetinst(viopath_hostLp),
238 0, VIOVERSION << 16,
239 ((u64)DEVICE_NO(d) << 48) /* | ((u64)flags << 32) */,
240 0, 0, 0);
241 if (hvrc != 0)
242 printk(VIOD_KERN_WARNING "HV close call failed %d\n",
243 (int)hvrc);
244 return 0;
248 /* External ioctl entry point.
250 static int viodasd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
252 struct gendisk *disk = bdev->bd_disk;
253 struct viodasd_device *d = disk->private_data;
255 geo->sectors = d->sectors ? d->sectors : 32;
256 geo->heads = d->tracks ? d->tracks : 64;
257 geo->cylinders = d->cylinders ? d->cylinders :
258 get_capacity(disk) / (geo->sectors * geo->heads);
260 return 0;
264 * Our file operations table
266 static struct block_device_operations viodasd_fops = {
267 .owner = THIS_MODULE,
268 .open = viodasd_open,
269 .release = viodasd_release,
270 .getgeo = viodasd_getgeo,
274 * End a request
276 static void viodasd_end_request(struct request *req, int uptodate,
277 int num_sectors)
279 if (end_that_request_first(req, uptodate, num_sectors))
280 return;
281 add_disk_randomness(req->rq_disk);
282 end_that_request_last(req, uptodate);
286 * Send an actual I/O request to OS/400
288 static int send_request(struct request *req)
290 u64 start;
291 int direction;
292 int nsg;
293 u16 viocmd;
294 HvLpEvent_Rc hvrc;
295 struct vioblocklpevent *bevent;
296 struct HvLpEvent *hev;
297 struct scatterlist sg[VIOMAXBLOCKDMA];
298 int sgindex;
299 int statindex;
300 struct viodasd_device *d;
301 unsigned long flags;
303 start = (u64)req->sector << 9;
305 if (rq_data_dir(req) == READ) {
306 direction = DMA_FROM_DEVICE;
307 viocmd = viomajorsubtype_blockio | vioblockread;
308 statindex = 0;
309 } else {
310 direction = DMA_TO_DEVICE;
311 viocmd = viomajorsubtype_blockio | vioblockwrite;
312 statindex = 1;
315 d = req->rq_disk->private_data;
317 /* Now build the scatter-gather list */
318 nsg = blk_rq_map_sg(req->q, req, sg);
319 nsg = dma_map_sg(d->dev, sg, nsg, direction);
321 spin_lock_irqsave(&viodasd_spinlock, flags);
322 num_req_outstanding++;
324 /* This optimization handles a single DMA block */
325 if (nsg == 1)
326 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
327 HvLpEvent_Type_VirtualIo, viocmd,
328 HvLpEvent_AckInd_DoAck,
329 HvLpEvent_AckType_ImmediateAck,
330 viopath_sourceinst(viopath_hostLp),
331 viopath_targetinst(viopath_hostLp),
332 (u64)(unsigned long)req, VIOVERSION << 16,
333 ((u64)DEVICE_NO(d) << 48), start,
334 ((u64)sg_dma_address(&sg[0])) << 32,
335 sg_dma_len(&sg[0]));
336 else {
337 bevent = (struct vioblocklpevent *)
338 vio_get_event_buffer(viomajorsubtype_blockio);
339 if (bevent == NULL) {
340 printk(VIOD_KERN_WARNING
341 "error allocating disk event buffer\n");
342 goto error_ret;
346 * Now build up the actual request. Note that we store
347 * the pointer to the request in the correlation
348 * token so we can match the response up later
350 memset(bevent, 0, sizeof(struct vioblocklpevent));
351 hev = &bevent->event;
352 hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DO_ACK |
353 HV_LP_EVENT_INT;
354 hev->xType = HvLpEvent_Type_VirtualIo;
355 hev->xSubtype = viocmd;
356 hev->xSourceLp = HvLpConfig_getLpIndex();
357 hev->xTargetLp = viopath_hostLp;
358 hev->xSizeMinus1 =
359 offsetof(struct vioblocklpevent, u.rw_data.dma_info) +
360 (sizeof(bevent->u.rw_data.dma_info[0]) * nsg) - 1;
361 hev->xSourceInstanceId = viopath_sourceinst(viopath_hostLp);
362 hev->xTargetInstanceId = viopath_targetinst(viopath_hostLp);
363 hev->xCorrelationToken = (u64)req;
364 bevent->version = VIOVERSION;
365 bevent->disk = DEVICE_NO(d);
366 bevent->u.rw_data.offset = start;
369 * Copy just the dma information from the sg list
370 * into the request
372 for (sgindex = 0; sgindex < nsg; sgindex++) {
373 bevent->u.rw_data.dma_info[sgindex].token =
374 sg_dma_address(&sg[sgindex]);
375 bevent->u.rw_data.dma_info[sgindex].len =
376 sg_dma_len(&sg[sgindex]);
379 /* Send the request */
380 hvrc = HvCallEvent_signalLpEvent(&bevent->event);
381 vio_free_event_buffer(viomajorsubtype_blockio, bevent);
384 if (hvrc != HvLpEvent_Rc_Good) {
385 printk(VIOD_KERN_WARNING
386 "error sending disk event to OS/400 (rc %d)\n",
387 (int)hvrc);
388 goto error_ret;
390 spin_unlock_irqrestore(&viodasd_spinlock, flags);
391 return 0;
393 error_ret:
394 num_req_outstanding--;
395 spin_unlock_irqrestore(&viodasd_spinlock, flags);
396 dma_unmap_sg(d->dev, sg, nsg, direction);
397 return -1;
401 * This is the external request processing routine
403 static void do_viodasd_request(request_queue_t *q)
405 struct request *req;
408 * If we already have the maximum number of requests
409 * outstanding to OS/400 just bail out. We'll come
410 * back later.
412 while (num_req_outstanding < VIOMAXREQ) {
413 req = elv_next_request(q);
414 if (req == NULL)
415 return;
416 /* dequeue the current request from the queue */
417 blkdev_dequeue_request(req);
418 /* check that request contains a valid command */
419 if (!blk_fs_request(req)) {
420 viodasd_end_request(req, 0, req->hard_nr_sectors);
421 continue;
423 /* Try sending the request */
424 if (send_request(req) != 0)
425 viodasd_end_request(req, 0, req->hard_nr_sectors);
430 * Probe a single disk and fill in the viodasd_device structure
431 * for it.
433 static void probe_disk(struct viodasd_device *d)
435 HvLpEvent_Rc hvrc;
436 struct viodasd_waitevent we;
437 int dev_no = DEVICE_NO(d);
438 struct gendisk *g;
439 struct request_queue *q;
440 u16 flags = 0;
442 retry:
443 init_completion(&we.com);
445 /* Send the open event to OS/400 */
446 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
447 HvLpEvent_Type_VirtualIo,
448 viomajorsubtype_blockio | vioblockopen,
449 HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck,
450 viopath_sourceinst(viopath_hostLp),
451 viopath_targetinst(viopath_hostLp),
452 (u64)(unsigned long)&we, VIOVERSION << 16,
453 ((u64)dev_no << 48) | ((u64)flags<< 32),
454 0, 0, 0);
455 if (hvrc != 0) {
456 printk(VIOD_KERN_WARNING "bad rc on HV open %d\n", (int)hvrc);
457 return;
460 wait_for_completion(&we.com);
462 if (we.rc != 0) {
463 if (flags != 0)
464 return;
465 /* try again with read only flag set */
466 flags = vioblockflags_ro;
467 goto retry;
469 if (we.max_disk > (MAX_DISKNO - 1)) {
470 static int warned;
472 if (warned == 0) {
473 warned++;
474 printk(VIOD_KERN_INFO
475 "Only examining the first %d "
476 "of %d disks connected\n",
477 MAX_DISKNO, we.max_disk + 1);
481 /* Send the close event to OS/400. We DON'T expect a response */
482 hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp,
483 HvLpEvent_Type_VirtualIo,
484 viomajorsubtype_blockio | vioblockclose,
485 HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck,
486 viopath_sourceinst(viopath_hostLp),
487 viopath_targetinst(viopath_hostLp),
488 0, VIOVERSION << 16,
489 ((u64)dev_no << 48) | ((u64)flags << 32),
490 0, 0, 0);
491 if (hvrc != 0) {
492 printk(VIOD_KERN_WARNING
493 "bad rc sending event to OS/400 %d\n", (int)hvrc);
494 return;
496 /* create the request queue for the disk */
497 spin_lock_init(&d->q_lock);
498 q = blk_init_queue(do_viodasd_request, &d->q_lock);
499 if (q == NULL) {
500 printk(VIOD_KERN_WARNING "cannot allocate queue for disk %d\n",
501 dev_no);
502 return;
504 g = alloc_disk(1 << PARTITION_SHIFT);
505 if (g == NULL) {
506 printk(VIOD_KERN_WARNING
507 "cannot allocate disk structure for disk %d\n",
508 dev_no);
509 blk_cleanup_queue(q);
510 return;
513 d->disk = g;
514 blk_queue_max_hw_segments(q, VIOMAXBLOCKDMA);
515 blk_queue_max_phys_segments(q, VIOMAXBLOCKDMA);
516 blk_queue_max_sectors(q, VIODASD_MAXSECTORS);
517 g->major = VIODASD_MAJOR;
518 g->first_minor = dev_no << PARTITION_SHIFT;
519 if (dev_no >= 26)
520 snprintf(g->disk_name, sizeof(g->disk_name),
521 VIOD_GENHD_NAME "%c%c",
522 'a' + (dev_no / 26) - 1, 'a' + (dev_no % 26));
523 else
524 snprintf(g->disk_name, sizeof(g->disk_name),
525 VIOD_GENHD_NAME "%c", 'a' + (dev_no % 26));
526 g->fops = &viodasd_fops;
527 g->queue = q;
528 g->private_data = d;
529 g->driverfs_dev = d->dev;
530 set_capacity(g, d->size >> 9);
532 printk(VIOD_KERN_INFO "disk %d: %lu sectors (%lu MB) "
533 "CHS=%d/%d/%d sector size %d%s\n",
534 dev_no, (unsigned long)(d->size >> 9),
535 (unsigned long)(d->size >> 20),
536 (int)d->cylinders, (int)d->tracks,
537 (int)d->sectors, (int)d->bytes_per_sector,
538 d->read_only ? " (RO)" : "");
540 /* register us in the global list */
541 add_disk(g);
544 /* returns the total number of scatterlist elements converted */
545 static int block_event_to_scatterlist(const struct vioblocklpevent *bevent,
546 struct scatterlist *sg, int *total_len)
548 int i, numsg;
549 const struct rw_data *rw_data = &bevent->u.rw_data;
550 static const int offset =
551 offsetof(struct vioblocklpevent, u.rw_data.dma_info);
552 static const int element_size = sizeof(rw_data->dma_info[0]);
554 numsg = ((bevent->event.xSizeMinus1 + 1) - offset) / element_size;
555 if (numsg > VIOMAXBLOCKDMA)
556 numsg = VIOMAXBLOCKDMA;
558 *total_len = 0;
559 memset(sg, 0, sizeof(sg[0]) * VIOMAXBLOCKDMA);
561 for (i = 0; (i < numsg) && (rw_data->dma_info[i].len > 0); ++i) {
562 sg_dma_address(&sg[i]) = rw_data->dma_info[i].token;
563 sg_dma_len(&sg[i]) = rw_data->dma_info[i].len;
564 *total_len += rw_data->dma_info[i].len;
566 return i;
570 * Restart all queues, starting with the one _after_ the disk given,
571 * thus reducing the chance of starvation of higher numbered disks.
573 static void viodasd_restart_all_queues_starting_from(int first_index)
575 int i;
577 for (i = first_index + 1; i < MAX_DISKNO; ++i)
578 if (viodasd_devices[i].disk)
579 blk_run_queue(viodasd_devices[i].disk->queue);
580 for (i = 0; i <= first_index; ++i)
581 if (viodasd_devices[i].disk)
582 blk_run_queue(viodasd_devices[i].disk->queue);
586 * For read and write requests, decrement the number of outstanding requests,
587 * Free the DMA buffers we allocated.
589 static int viodasd_handle_read_write(struct vioblocklpevent *bevent)
591 int num_sg, num_sect, pci_direction, total_len;
592 struct request *req;
593 struct scatterlist sg[VIOMAXBLOCKDMA];
594 struct HvLpEvent *event = &bevent->event;
595 unsigned long irq_flags;
596 struct viodasd_device *d;
597 int error;
598 spinlock_t *qlock;
600 num_sg = block_event_to_scatterlist(bevent, sg, &total_len);
601 num_sect = total_len >> 9;
602 if (event->xSubtype == (viomajorsubtype_blockio | vioblockread))
603 pci_direction = DMA_FROM_DEVICE;
604 else
605 pci_direction = DMA_TO_DEVICE;
606 req = (struct request *)bevent->event.xCorrelationToken;
607 d = req->rq_disk->private_data;
609 dma_unmap_sg(d->dev, sg, num_sg, pci_direction);
612 * Since this is running in interrupt mode, we need to make sure
613 * we're not stepping on any global I/O operations
615 spin_lock_irqsave(&viodasd_spinlock, irq_flags);
616 num_req_outstanding--;
617 spin_unlock_irqrestore(&viodasd_spinlock, irq_flags);
619 error = event->xRc != HvLpEvent_Rc_Good;
620 if (error) {
621 const struct vio_error_entry *err;
622 err = vio_lookup_rc(viodasd_err_table, bevent->sub_result);
623 printk(VIOD_KERN_WARNING "read/write error %d:0x%04x (%s)\n",
624 event->xRc, bevent->sub_result, err->msg);
625 num_sect = req->hard_nr_sectors;
627 qlock = req->q->queue_lock;
628 spin_lock_irqsave(qlock, irq_flags);
629 viodasd_end_request(req, !error, num_sect);
630 spin_unlock_irqrestore(qlock, irq_flags);
632 /* Finally, try to get more requests off of this device's queue */
633 viodasd_restart_all_queues_starting_from(DEVICE_NO(d));
635 return 0;
638 /* This routine handles incoming block LP events */
639 static void handle_block_event(struct HvLpEvent *event)
641 struct vioblocklpevent *bevent = (struct vioblocklpevent *)event;
642 struct viodasd_waitevent *pwe;
644 if (event == NULL)
645 /* Notification that a partition went away! */
646 return;
647 /* First, we should NEVER get an int here...only acks */
648 if (hvlpevent_is_int(event)) {
649 printk(VIOD_KERN_WARNING
650 "Yikes! got an int in viodasd event handler!\n");
651 if (hvlpevent_need_ack(event)) {
652 event->xRc = HvLpEvent_Rc_InvalidSubtype;
653 HvCallEvent_ackLpEvent(event);
657 switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) {
658 case vioblockopen:
660 * Handle a response to an open request. We get all the
661 * disk information in the response, so update it. The
662 * correlation token contains a pointer to a waitevent
663 * structure that has a completion in it. update the
664 * return code in the waitevent structure and post the
665 * completion to wake up the guy who sent the request
667 pwe = (struct viodasd_waitevent *)event->xCorrelationToken;
668 pwe->rc = event->xRc;
669 pwe->sub_result = bevent->sub_result;
670 if (event->xRc == HvLpEvent_Rc_Good) {
671 const struct open_data *data = &bevent->u.open_data;
672 struct viodasd_device *device =
673 &viodasd_devices[bevent->disk];
674 device->read_only =
675 bevent->flags & vioblockflags_ro;
676 device->size = data->disk_size;
677 device->cylinders = data->cylinders;
678 device->tracks = data->tracks;
679 device->sectors = data->sectors;
680 device->bytes_per_sector = data->bytes_per_sector;
681 pwe->max_disk = data->max_disk;
683 complete(&pwe->com);
684 break;
685 case vioblockclose:
686 break;
687 case vioblockread:
688 case vioblockwrite:
689 viodasd_handle_read_write(bevent);
690 break;
692 default:
693 printk(VIOD_KERN_WARNING "invalid subtype!");
694 if (hvlpevent_need_ack(event)) {
695 event->xRc = HvLpEvent_Rc_InvalidSubtype;
696 HvCallEvent_ackLpEvent(event);
702 * Get the driver to reprobe for more disks.
704 static ssize_t probe_disks(struct device_driver *drv, const char *buf,
705 size_t count)
707 struct viodasd_device *d;
709 for (d = viodasd_devices; d < &viodasd_devices[MAX_DISKNO]; d++) {
710 if (d->disk == NULL)
711 probe_disk(d);
713 return count;
715 static DRIVER_ATTR(probe, S_IWUSR, NULL, probe_disks);
717 static int viodasd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
719 struct viodasd_device *d = &viodasd_devices[vdev->unit_address];
721 d->dev = &vdev->dev;
722 probe_disk(d);
723 if (d->disk == NULL)
724 return -ENODEV;
725 return 0;
728 static int viodasd_remove(struct vio_dev *vdev)
730 struct viodasd_device *d;
732 d = &viodasd_devices[vdev->unit_address];
733 if (d->disk) {
734 del_gendisk(d->disk);
735 blk_cleanup_queue(d->disk->queue);
736 put_disk(d->disk);
737 d->disk = NULL;
739 d->dev = NULL;
740 return 0;
744 * viodasd_device_table: Used by vio.c to match devices that we
745 * support.
747 static struct vio_device_id viodasd_device_table[] __devinitdata = {
748 { "block", "IBM,iSeries-viodasd" },
749 { "", "" }
751 MODULE_DEVICE_TABLE(vio, viodasd_device_table);
753 static struct vio_driver viodasd_driver = {
754 .id_table = viodasd_device_table,
755 .probe = viodasd_probe,
756 .remove = viodasd_remove,
757 .driver = {
758 .name = "viodasd",
759 .owner = THIS_MODULE,
763 static int need_delete_probe;
766 * Initialize the whole device driver. Handle module and non-module
767 * versions
769 static int __init viodasd_init(void)
771 int rc;
773 if (!firmware_has_feature(FW_FEATURE_ISERIES)) {
774 rc = -ENODEV;
775 goto early_fail;
778 /* Try to open to our host lp */
779 if (viopath_hostLp == HvLpIndexInvalid)
780 vio_set_hostlp();
782 if (viopath_hostLp == HvLpIndexInvalid) {
783 printk(VIOD_KERN_WARNING "invalid hosting partition\n");
784 rc = -EIO;
785 goto early_fail;
788 printk(VIOD_KERN_INFO "vers " VIOD_VERS ", hosting partition %d\n",
789 viopath_hostLp);
791 /* register the block device */
792 rc = register_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME);
793 if (rc) {
794 printk(VIOD_KERN_WARNING
795 "Unable to get major number %d for %s\n",
796 VIODASD_MAJOR, VIOD_GENHD_NAME);
797 goto early_fail;
799 /* Actually open the path to the hosting partition */
800 rc = viopath_open(viopath_hostLp, viomajorsubtype_blockio,
801 VIOMAXREQ + 2);
802 if (rc) {
803 printk(VIOD_KERN_WARNING
804 "error opening path to host partition %d\n",
805 viopath_hostLp);
806 goto unregister_blk;
809 /* Initialize our request handler */
810 vio_setHandler(viomajorsubtype_blockio, handle_block_event);
812 rc = vio_register_driver(&viodasd_driver);
813 if (rc) {
814 printk(VIOD_KERN_WARNING "vio_register_driver failed\n");
815 goto unset_handler;
819 * If this call fails, it just means that we cannot dynamically
820 * add virtual disks, but the driver will still work fine for
821 * all existing disk, so ignore the failure.
823 if (!driver_create_file(&viodasd_driver.driver, &driver_attr_probe))
824 need_delete_probe = 1;
826 return 0;
828 unset_handler:
829 vio_clearHandler(viomajorsubtype_blockio);
830 viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2);
831 unregister_blk:
832 unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME);
833 early_fail:
834 return rc;
836 module_init(viodasd_init);
838 void __exit viodasd_exit(void)
840 if (need_delete_probe)
841 driver_remove_file(&viodasd_driver.driver, &driver_attr_probe);
842 vio_unregister_driver(&viodasd_driver);
843 vio_clearHandler(viomajorsubtype_blockio);
844 viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2);
845 unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME);
847 module_exit(viodasd_exit);