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>
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/scatterlist.h>
46 #include <asm/uaccess.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: "
71 MAX_DISKNO
= HVMAXARCHITECTEDVIRTUALDISKS
,
72 MAX_DISK_NAME
= sizeof(((struct gendisk
*)0)->disk_name
)
75 static DEFINE_SPINLOCK(viodasd_spinlock
);
79 #define DEVICE_NO(cell) ((struct viodasd_device *)(cell) - &viodasd_devices[0])
81 struct viodasd_waitevent
{
82 struct completion com
;
85 int max_disk
; /* open */
88 static const struct vio_error_entry viodasd_err_table
[] = {
89 { 0x0201, EINVAL
, "Invalid Range" },
90 { 0x0202, EINVAL
, "Invalid Token" },
91 { 0x0203, EIO
, "DMA Error" },
92 { 0x0204, EIO
, "Use Error" },
93 { 0x0205, EIO
, "Release Error" },
94 { 0x0206, EINVAL
, "Invalid Disk" },
95 { 0x0207, EBUSY
, "Cant Lock" },
96 { 0x0208, EIO
, "Already Locked" },
97 { 0x0209, EIO
, "Already Unlocked" },
98 { 0x020A, EIO
, "Invalid Arg" },
99 { 0x020B, EIO
, "Bad IFS File" },
100 { 0x020C, EROFS
, "Read Only Device" },
101 { 0x02FF, EIO
, "Internal Error" },
106 * Figure out the biggest I/O request (in sectors) we can accept
108 #define VIODASD_MAXSECTORS (4096 / 512 * VIOMAXBLOCKDMA)
111 * Number of disk I/O requests we've sent to OS/400
113 static int num_req_outstanding
;
116 * This is our internal structure for keeping track of disk devices
118 struct viodasd_device
{
122 u16 bytes_per_sector
;
126 struct gendisk
*disk
;
128 } viodasd_devices
[MAX_DISKNO
];
131 * External open entry point.
133 static int viodasd_open(struct inode
*ino
, struct file
*fil
)
135 struct viodasd_device
*d
= ino
->i_bdev
->bd_disk
->private_data
;
137 struct viodasd_waitevent we
;
141 if ((fil
!= NULL
) && (fil
->f_mode
& FMODE_WRITE
))
143 flags
= vioblockflags_ro
;
146 init_completion(&we
.com
);
148 /* Send the open event to OS/400 */
149 hvrc
= HvCallEvent_signalLpEventFast(viopath_hostLp
,
150 HvLpEvent_Type_VirtualIo
,
151 viomajorsubtype_blockio
| vioblockopen
,
152 HvLpEvent_AckInd_DoAck
, HvLpEvent_AckType_ImmediateAck
,
153 viopath_sourceinst(viopath_hostLp
),
154 viopath_targetinst(viopath_hostLp
),
155 (u64
)(unsigned long)&we
, VIOVERSION
<< 16,
156 ((u64
)DEVICE_NO(d
) << 48) | ((u64
)flags
<< 32),
159 printk(VIOD_KERN_WARNING
"HV open failed %d\n", (int)hvrc
);
163 wait_for_completion(&we
.com
);
165 /* Check the return code */
167 const struct vio_error_entry
*err
=
168 vio_lookup_rc(viodasd_err_table
, we
.sub_result
);
170 printk(VIOD_KERN_WARNING
171 "bad rc opening disk: %d:0x%04x (%s)\n",
172 (int)we
.rc
, we
.sub_result
, err
->msg
);
180 * External release entry point.
182 static int viodasd_release(struct inode
*ino
, struct file
*fil
)
184 struct viodasd_device
*d
= ino
->i_bdev
->bd_disk
->private_data
;
187 /* Send the event to OS/400. We DON'T expect a response */
188 hvrc
= HvCallEvent_signalLpEventFast(viopath_hostLp
,
189 HvLpEvent_Type_VirtualIo
,
190 viomajorsubtype_blockio
| vioblockclose
,
191 HvLpEvent_AckInd_NoAck
, HvLpEvent_AckType_ImmediateAck
,
192 viopath_sourceinst(viopath_hostLp
),
193 viopath_targetinst(viopath_hostLp
),
195 ((u64
)DEVICE_NO(d
) << 48) /* | ((u64)flags << 32) */,
198 printk(VIOD_KERN_WARNING
"HV close call failed %d\n",
204 /* External ioctl entry point.
206 static int viodasd_getgeo(struct block_device
*bdev
, struct hd_geometry
*geo
)
208 struct gendisk
*disk
= bdev
->bd_disk
;
209 struct viodasd_device
*d
= disk
->private_data
;
211 geo
->sectors
= d
->sectors
? d
->sectors
: 32;
212 geo
->heads
= d
->tracks
? d
->tracks
: 64;
213 geo
->cylinders
= d
->cylinders
? d
->cylinders
:
214 get_capacity(disk
) / (geo
->sectors
* geo
->heads
);
220 * Our file operations table
222 static struct block_device_operations viodasd_fops
= {
223 .owner
= THIS_MODULE
,
224 .open
= viodasd_open
,
225 .release
= viodasd_release
,
226 .getgeo
= viodasd_getgeo
,
232 static void viodasd_end_request(struct request
*req
, int uptodate
,
235 if (end_that_request_first(req
, uptodate
, num_sectors
))
237 add_disk_randomness(req
->rq_disk
);
238 end_that_request_last(req
, uptodate
);
242 * Send an actual I/O request to OS/400
244 static int send_request(struct request
*req
)
251 struct vioblocklpevent
*bevent
;
252 struct HvLpEvent
*hev
;
253 struct scatterlist sg
[VIOMAXBLOCKDMA
];
256 struct viodasd_device
*d
;
259 start
= (u64
)req
->sector
<< 9;
261 if (rq_data_dir(req
) == READ
) {
262 direction
= DMA_FROM_DEVICE
;
263 viocmd
= viomajorsubtype_blockio
| vioblockread
;
266 direction
= DMA_TO_DEVICE
;
267 viocmd
= viomajorsubtype_blockio
| vioblockwrite
;
271 d
= req
->rq_disk
->private_data
;
273 /* Now build the scatter-gather list */
274 sg_init_table(sg
, VIOMAXBLOCKDMA
);
275 nsg
= blk_rq_map_sg(req
->q
, req
, sg
);
276 nsg
= dma_map_sg(d
->dev
, sg
, nsg
, direction
);
278 spin_lock_irqsave(&viodasd_spinlock
, flags
);
279 num_req_outstanding
++;
281 /* This optimization handles a single DMA block */
283 hvrc
= HvCallEvent_signalLpEventFast(viopath_hostLp
,
284 HvLpEvent_Type_VirtualIo
, viocmd
,
285 HvLpEvent_AckInd_DoAck
,
286 HvLpEvent_AckType_ImmediateAck
,
287 viopath_sourceinst(viopath_hostLp
),
288 viopath_targetinst(viopath_hostLp
),
289 (u64
)(unsigned long)req
, VIOVERSION
<< 16,
290 ((u64
)DEVICE_NO(d
) << 48), start
,
291 ((u64
)sg_dma_address(&sg
[0])) << 32,
294 bevent
= (struct vioblocklpevent
*)
295 vio_get_event_buffer(viomajorsubtype_blockio
);
296 if (bevent
== NULL
) {
297 printk(VIOD_KERN_WARNING
298 "error allocating disk event buffer\n");
303 * Now build up the actual request. Note that we store
304 * the pointer to the request in the correlation
305 * token so we can match the response up later
307 memset(bevent
, 0, sizeof(struct vioblocklpevent
));
308 hev
= &bevent
->event
;
309 hev
->flags
= HV_LP_EVENT_VALID
| HV_LP_EVENT_DO_ACK
|
311 hev
->xType
= HvLpEvent_Type_VirtualIo
;
312 hev
->xSubtype
= viocmd
;
313 hev
->xSourceLp
= HvLpConfig_getLpIndex();
314 hev
->xTargetLp
= viopath_hostLp
;
316 offsetof(struct vioblocklpevent
, u
.rw_data
.dma_info
) +
317 (sizeof(bevent
->u
.rw_data
.dma_info
[0]) * nsg
) - 1;
318 hev
->xSourceInstanceId
= viopath_sourceinst(viopath_hostLp
);
319 hev
->xTargetInstanceId
= viopath_targetinst(viopath_hostLp
);
320 hev
->xCorrelationToken
= (u64
)req
;
321 bevent
->version
= VIOVERSION
;
322 bevent
->disk
= DEVICE_NO(d
);
323 bevent
->u
.rw_data
.offset
= start
;
326 * Copy just the dma information from the sg list
329 for (sgindex
= 0; sgindex
< nsg
; sgindex
++) {
330 bevent
->u
.rw_data
.dma_info
[sgindex
].token
=
331 sg_dma_address(&sg
[sgindex
]);
332 bevent
->u
.rw_data
.dma_info
[sgindex
].len
=
333 sg_dma_len(&sg
[sgindex
]);
336 /* Send the request */
337 hvrc
= HvCallEvent_signalLpEvent(&bevent
->event
);
338 vio_free_event_buffer(viomajorsubtype_blockio
, bevent
);
341 if (hvrc
!= HvLpEvent_Rc_Good
) {
342 printk(VIOD_KERN_WARNING
343 "error sending disk event to OS/400 (rc %d)\n",
347 spin_unlock_irqrestore(&viodasd_spinlock
, flags
);
351 num_req_outstanding
--;
352 spin_unlock_irqrestore(&viodasd_spinlock
, flags
);
353 dma_unmap_sg(d
->dev
, sg
, nsg
, direction
);
358 * This is the external request processing routine
360 static void do_viodasd_request(struct request_queue
*q
)
365 * If we already have the maximum number of requests
366 * outstanding to OS/400 just bail out. We'll come
369 while (num_req_outstanding
< VIOMAXREQ
) {
370 req
= elv_next_request(q
);
373 /* dequeue the current request from the queue */
374 blkdev_dequeue_request(req
);
375 /* check that request contains a valid command */
376 if (!blk_fs_request(req
)) {
377 viodasd_end_request(req
, 0, req
->hard_nr_sectors
);
380 /* Try sending the request */
381 if (send_request(req
) != 0)
382 viodasd_end_request(req
, 0, req
->hard_nr_sectors
);
387 * Probe a single disk and fill in the viodasd_device structure
390 static int probe_disk(struct viodasd_device
*d
)
393 struct viodasd_waitevent we
;
394 int dev_no
= DEVICE_NO(d
);
396 struct request_queue
*q
;
400 init_completion(&we
.com
);
402 /* Send the open event to OS/400 */
403 hvrc
= HvCallEvent_signalLpEventFast(viopath_hostLp
,
404 HvLpEvent_Type_VirtualIo
,
405 viomajorsubtype_blockio
| vioblockopen
,
406 HvLpEvent_AckInd_DoAck
, HvLpEvent_AckType_ImmediateAck
,
407 viopath_sourceinst(viopath_hostLp
),
408 viopath_targetinst(viopath_hostLp
),
409 (u64
)(unsigned long)&we
, VIOVERSION
<< 16,
410 ((u64
)dev_no
<< 48) | ((u64
)flags
<< 32),
413 printk(VIOD_KERN_WARNING
"bad rc on HV open %d\n", (int)hvrc
);
417 wait_for_completion(&we
.com
);
422 /* try again with read only flag set */
423 flags
= vioblockflags_ro
;
426 if (we
.max_disk
> (MAX_DISKNO
- 1)) {
431 printk(VIOD_KERN_INFO
432 "Only examining the first %d "
433 "of %d disks connected\n",
434 MAX_DISKNO
, we
.max_disk
+ 1);
438 /* Send the close event to OS/400. We DON'T expect a response */
439 hvrc
= HvCallEvent_signalLpEventFast(viopath_hostLp
,
440 HvLpEvent_Type_VirtualIo
,
441 viomajorsubtype_blockio
| vioblockclose
,
442 HvLpEvent_AckInd_NoAck
, HvLpEvent_AckType_ImmediateAck
,
443 viopath_sourceinst(viopath_hostLp
),
444 viopath_targetinst(viopath_hostLp
),
446 ((u64
)dev_no
<< 48) | ((u64
)flags
<< 32),
449 printk(VIOD_KERN_WARNING
450 "bad rc sending event to OS/400 %d\n", (int)hvrc
);
454 if (d
->dev
== NULL
) {
455 /* this is when we reprobe for new disks */
456 if (vio_create_viodasd(dev_no
) == NULL
) {
457 printk(VIOD_KERN_WARNING
458 "cannot allocate virtual device for disk %d\n",
463 * The vio_create_viodasd will have recursed into this
464 * routine with d->dev set to the new vio device and
465 * will finish the setup of the disk below.
470 /* create the request queue for the disk */
471 spin_lock_init(&d
->q_lock
);
472 q
= blk_init_queue(do_viodasd_request
, &d
->q_lock
);
474 printk(VIOD_KERN_WARNING
"cannot allocate queue for disk %d\n",
478 g
= alloc_disk(1 << PARTITION_SHIFT
);
480 printk(VIOD_KERN_WARNING
481 "cannot allocate disk structure for disk %d\n",
483 blk_cleanup_queue(q
);
488 blk_queue_max_hw_segments(q
, VIOMAXBLOCKDMA
);
489 blk_queue_max_phys_segments(q
, VIOMAXBLOCKDMA
);
490 blk_queue_max_sectors(q
, VIODASD_MAXSECTORS
);
491 g
->major
= VIODASD_MAJOR
;
492 g
->first_minor
= dev_no
<< PARTITION_SHIFT
;
494 snprintf(g
->disk_name
, sizeof(g
->disk_name
),
495 VIOD_GENHD_NAME
"%c%c",
496 'a' + (dev_no
/ 26) - 1, 'a' + (dev_no
% 26));
498 snprintf(g
->disk_name
, sizeof(g
->disk_name
),
499 VIOD_GENHD_NAME
"%c", 'a' + (dev_no
% 26));
500 g
->fops
= &viodasd_fops
;
503 g
->driverfs_dev
= d
->dev
;
504 set_capacity(g
, d
->size
>> 9);
506 printk(VIOD_KERN_INFO
"disk %d: %lu sectors (%lu MB) "
507 "CHS=%d/%d/%d sector size %d%s\n",
508 dev_no
, (unsigned long)(d
->size
>> 9),
509 (unsigned long)(d
->size
>> 20),
510 (int)d
->cylinders
, (int)d
->tracks
,
511 (int)d
->sectors
, (int)d
->bytes_per_sector
,
512 d
->read_only
? " (RO)" : "");
514 /* register us in the global list */
519 /* returns the total number of scatterlist elements converted */
520 static int block_event_to_scatterlist(const struct vioblocklpevent
*bevent
,
521 struct scatterlist
*sg
, int *total_len
)
524 const struct rw_data
*rw_data
= &bevent
->u
.rw_data
;
525 static const int offset
=
526 offsetof(struct vioblocklpevent
, u
.rw_data
.dma_info
);
527 static const int element_size
= sizeof(rw_data
->dma_info
[0]);
529 numsg
= ((bevent
->event
.xSizeMinus1
+ 1) - offset
) / element_size
;
530 if (numsg
> VIOMAXBLOCKDMA
)
531 numsg
= VIOMAXBLOCKDMA
;
534 memset(sg
, 0, sizeof(sg
[0]) * VIOMAXBLOCKDMA
);
536 for (i
= 0; (i
< numsg
) && (rw_data
->dma_info
[i
].len
> 0); ++i
) {
537 sg_dma_address(&sg
[i
]) = rw_data
->dma_info
[i
].token
;
538 sg_dma_len(&sg
[i
]) = rw_data
->dma_info
[i
].len
;
539 *total_len
+= rw_data
->dma_info
[i
].len
;
545 * Restart all queues, starting with the one _after_ the disk given,
546 * thus reducing the chance of starvation of higher numbered disks.
548 static void viodasd_restart_all_queues_starting_from(int first_index
)
552 for (i
= first_index
+ 1; i
< MAX_DISKNO
; ++i
)
553 if (viodasd_devices
[i
].disk
)
554 blk_run_queue(viodasd_devices
[i
].disk
->queue
);
555 for (i
= 0; i
<= first_index
; ++i
)
556 if (viodasd_devices
[i
].disk
)
557 blk_run_queue(viodasd_devices
[i
].disk
->queue
);
561 * For read and write requests, decrement the number of outstanding requests,
562 * Free the DMA buffers we allocated.
564 static int viodasd_handle_read_write(struct vioblocklpevent
*bevent
)
566 int num_sg
, num_sect
, pci_direction
, total_len
;
568 struct scatterlist sg
[VIOMAXBLOCKDMA
];
569 struct HvLpEvent
*event
= &bevent
->event
;
570 unsigned long irq_flags
;
571 struct viodasd_device
*d
;
575 num_sg
= block_event_to_scatterlist(bevent
, sg
, &total_len
);
576 num_sect
= total_len
>> 9;
577 if (event
->xSubtype
== (viomajorsubtype_blockio
| vioblockread
))
578 pci_direction
= DMA_FROM_DEVICE
;
580 pci_direction
= DMA_TO_DEVICE
;
581 req
= (struct request
*)bevent
->event
.xCorrelationToken
;
582 d
= req
->rq_disk
->private_data
;
584 dma_unmap_sg(d
->dev
, sg
, num_sg
, pci_direction
);
587 * Since this is running in interrupt mode, we need to make sure
588 * we're not stepping on any global I/O operations
590 spin_lock_irqsave(&viodasd_spinlock
, irq_flags
);
591 num_req_outstanding
--;
592 spin_unlock_irqrestore(&viodasd_spinlock
, irq_flags
);
594 error
= event
->xRc
!= HvLpEvent_Rc_Good
;
596 const struct vio_error_entry
*err
;
597 err
= vio_lookup_rc(viodasd_err_table
, bevent
->sub_result
);
598 printk(VIOD_KERN_WARNING
"read/write error %d:0x%04x (%s)\n",
599 event
->xRc
, bevent
->sub_result
, err
->msg
);
600 num_sect
= req
->hard_nr_sectors
;
602 qlock
= req
->q
->queue_lock
;
603 spin_lock_irqsave(qlock
, irq_flags
);
604 viodasd_end_request(req
, !error
, num_sect
);
605 spin_unlock_irqrestore(qlock
, irq_flags
);
607 /* Finally, try to get more requests off of this device's queue */
608 viodasd_restart_all_queues_starting_from(DEVICE_NO(d
));
613 /* This routine handles incoming block LP events */
614 static void handle_block_event(struct HvLpEvent
*event
)
616 struct vioblocklpevent
*bevent
= (struct vioblocklpevent
*)event
;
617 struct viodasd_waitevent
*pwe
;
620 /* Notification that a partition went away! */
622 /* First, we should NEVER get an int here...only acks */
623 if (hvlpevent_is_int(event
)) {
624 printk(VIOD_KERN_WARNING
625 "Yikes! got an int in viodasd event handler!\n");
626 if (hvlpevent_need_ack(event
)) {
627 event
->xRc
= HvLpEvent_Rc_InvalidSubtype
;
628 HvCallEvent_ackLpEvent(event
);
632 switch (event
->xSubtype
& VIOMINOR_SUBTYPE_MASK
) {
635 * Handle a response to an open request. We get all the
636 * disk information in the response, so update it. The
637 * correlation token contains a pointer to a waitevent
638 * structure that has a completion in it. update the
639 * return code in the waitevent structure and post the
640 * completion to wake up the guy who sent the request
642 pwe
= (struct viodasd_waitevent
*)event
->xCorrelationToken
;
643 pwe
->rc
= event
->xRc
;
644 pwe
->sub_result
= bevent
->sub_result
;
645 if (event
->xRc
== HvLpEvent_Rc_Good
) {
646 const struct open_data
*data
= &bevent
->u
.open_data
;
647 struct viodasd_device
*device
=
648 &viodasd_devices
[bevent
->disk
];
650 bevent
->flags
& vioblockflags_ro
;
651 device
->size
= data
->disk_size
;
652 device
->cylinders
= data
->cylinders
;
653 device
->tracks
= data
->tracks
;
654 device
->sectors
= data
->sectors
;
655 device
->bytes_per_sector
= data
->bytes_per_sector
;
656 pwe
->max_disk
= data
->max_disk
;
664 viodasd_handle_read_write(bevent
);
668 printk(VIOD_KERN_WARNING
"invalid subtype!");
669 if (hvlpevent_need_ack(event
)) {
670 event
->xRc
= HvLpEvent_Rc_InvalidSubtype
;
671 HvCallEvent_ackLpEvent(event
);
677 * Get the driver to reprobe for more disks.
679 static ssize_t
probe_disks(struct device_driver
*drv
, const char *buf
,
682 struct viodasd_device
*d
;
684 for (d
= viodasd_devices
; d
< &viodasd_devices
[MAX_DISKNO
]; d
++) {
690 static DRIVER_ATTR(probe
, S_IWUSR
, NULL
, probe_disks
);
692 static int viodasd_probe(struct vio_dev
*vdev
, const struct vio_device_id
*id
)
694 struct viodasd_device
*d
= &viodasd_devices
[vdev
->unit_address
];
702 static int viodasd_remove(struct vio_dev
*vdev
)
704 struct viodasd_device
*d
;
706 d
= &viodasd_devices
[vdev
->unit_address
];
708 del_gendisk(d
->disk
);
709 blk_cleanup_queue(d
->disk
->queue
);
718 * viodasd_device_table: Used by vio.c to match devices that we
721 static struct vio_device_id viodasd_device_table
[] __devinitdata
= {
722 { "block", "IBM,iSeries-viodasd" },
725 MODULE_DEVICE_TABLE(vio
, viodasd_device_table
);
727 static struct vio_driver viodasd_driver
= {
728 .id_table
= viodasd_device_table
,
729 .probe
= viodasd_probe
,
730 .remove
= viodasd_remove
,
733 .owner
= THIS_MODULE
,
737 static int need_delete_probe
;
740 * Initialize the whole device driver. Handle module and non-module
743 static int __init
viodasd_init(void)
747 if (!firmware_has_feature(FW_FEATURE_ISERIES
)) {
752 /* Try to open to our host lp */
753 if (viopath_hostLp
== HvLpIndexInvalid
)
756 if (viopath_hostLp
== HvLpIndexInvalid
) {
757 printk(VIOD_KERN_WARNING
"invalid hosting partition\n");
762 printk(VIOD_KERN_INFO
"vers " VIOD_VERS
", hosting partition %d\n",
765 /* register the block device */
766 rc
= register_blkdev(VIODASD_MAJOR
, VIOD_GENHD_NAME
);
768 printk(VIOD_KERN_WARNING
769 "Unable to get major number %d for %s\n",
770 VIODASD_MAJOR
, VIOD_GENHD_NAME
);
773 /* Actually open the path to the hosting partition */
774 rc
= viopath_open(viopath_hostLp
, viomajorsubtype_blockio
,
777 printk(VIOD_KERN_WARNING
778 "error opening path to host partition %d\n",
783 /* Initialize our request handler */
784 vio_setHandler(viomajorsubtype_blockio
, handle_block_event
);
786 rc
= vio_register_driver(&viodasd_driver
);
788 printk(VIOD_KERN_WARNING
"vio_register_driver failed\n");
793 * If this call fails, it just means that we cannot dynamically
794 * add virtual disks, but the driver will still work fine for
795 * all existing disk, so ignore the failure.
797 if (!driver_create_file(&viodasd_driver
.driver
, &driver_attr_probe
))
798 need_delete_probe
= 1;
803 vio_clearHandler(viomajorsubtype_blockio
);
804 viopath_close(viopath_hostLp
, viomajorsubtype_blockio
, VIOMAXREQ
+ 2);
806 unregister_blkdev(VIODASD_MAJOR
, VIOD_GENHD_NAME
);
810 module_init(viodasd_init
);
812 void __exit
viodasd_exit(void)
814 if (need_delete_probe
)
815 driver_remove_file(&viodasd_driver
.driver
, &driver_attr_probe
);
816 vio_unregister_driver(&viodasd_driver
);
817 vio_clearHandler(viomajorsubtype_blockio
);
818 viopath_close(viopath_hostLp
, viomajorsubtype_blockio
, VIOMAXREQ
+ 2);
819 unregister_blkdev(VIODASD_MAJOR
, VIOD_GENHD_NAME
);
821 module_exit(viodasd_exit
);