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/kernel.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>
53 MODULE_DESCRIPTION("iSeries Virtual DASD");
54 MODULE_AUTHOR("Dave Boutcher");
55 MODULE_LICENSE("GPL");
58 * We only support 7 partitions per physical disk....so with minor
59 * numbers 0-255 we get a maximum of 32 disks.
61 #define VIOD_GENHD_NAME "iseries/vd"
62 #define VIOD_GENHD_DEVFS_NAME "iseries/disc"
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
);
78 #define VIOMAXBLOCKDMA 12
80 #define DEVICE_NO(cell) ((struct viodasd_device *)(cell) - &viodasd_devices[0])
97 } dma_info
[VIOMAXBLOCKDMA
];
100 struct vioblocklpevent
{
101 struct HvLpEvent event
;
108 struct open_data open_data
;
109 struct rw_data rw_data
;
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
;
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" },
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
{
166 u16 bytes_per_sector
;
170 struct gendisk
*disk
;
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
;
181 struct viodasd_waitevent we
;
185 if ((fil
!= NULL
) && (fil
->f_mode
& FMODE_WRITE
))
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),
203 printk(VIOD_KERN_WARNING
"HV open failed %d\n", (int)hvrc
);
207 wait_for_completion(&we
.com
);
209 /* Check the return code */
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
);
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
;
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
),
239 ((u64
)DEVICE_NO(d
) << 48) /* | ((u64)flags << 32) */,
242 printk(VIOD_KERN_WARNING
"HV close call failed %d\n",
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
: 0;
256 geo
->heads
= d
->tracks
? d
->tracks
: 64;
257 geo
->cylinders
= d
->cylinders
? d
->cylinders
:
258 get_capacity(disk
) / (geo
->cylinders
* geo
->heads
);
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
,
276 static void viodasd_end_request(struct request
*req
, int uptodate
,
279 if (end_that_request_first(req
, uptodate
, num_sectors
))
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
)
295 struct vioblocklpevent
*bevent
;
296 struct scatterlist sg
[VIOMAXBLOCKDMA
];
299 struct viodasd_device
*d
;
302 start
= (u64
)req
->sector
<< 9;
304 if (rq_data_dir(req
) == READ
) {
305 direction
= DMA_FROM_DEVICE
;
306 viocmd
= viomajorsubtype_blockio
| vioblockread
;
309 direction
= DMA_TO_DEVICE
;
310 viocmd
= viomajorsubtype_blockio
| vioblockwrite
;
314 d
= req
->rq_disk
->private_data
;
316 /* Now build the scatter-gather list */
317 nsg
= blk_rq_map_sg(req
->q
, req
, sg
);
318 nsg
= dma_map_sg(d
->dev
, sg
, nsg
, direction
);
320 spin_lock_irqsave(&viodasd_spinlock
, flags
);
321 num_req_outstanding
++;
323 /* This optimization handles a single DMA block */
325 hvrc
= HvCallEvent_signalLpEventFast(viopath_hostLp
,
326 HvLpEvent_Type_VirtualIo
, viocmd
,
327 HvLpEvent_AckInd_DoAck
,
328 HvLpEvent_AckType_ImmediateAck
,
329 viopath_sourceinst(viopath_hostLp
),
330 viopath_targetinst(viopath_hostLp
),
331 (u64
)(unsigned long)req
, VIOVERSION
<< 16,
332 ((u64
)DEVICE_NO(d
) << 48), start
,
333 ((u64
)sg_dma_address(&sg
[0])) << 32,
336 bevent
= (struct vioblocklpevent
*)
337 vio_get_event_buffer(viomajorsubtype_blockio
);
338 if (bevent
== NULL
) {
339 printk(VIOD_KERN_WARNING
340 "error allocating disk event buffer\n");
345 * Now build up the actual request. Note that we store
346 * the pointer to the request in the correlation
347 * token so we can match the response up later
349 memset(bevent
, 0, sizeof(struct vioblocklpevent
));
350 bevent
->event
.xFlags
.xValid
= 1;
351 bevent
->event
.xFlags
.xFunction
= HvLpEvent_Function_Int
;
352 bevent
->event
.xFlags
.xAckInd
= HvLpEvent_AckInd_DoAck
;
353 bevent
->event
.xFlags
.xAckType
= HvLpEvent_AckType_ImmediateAck
;
354 bevent
->event
.xType
= HvLpEvent_Type_VirtualIo
;
355 bevent
->event
.xSubtype
= viocmd
;
356 bevent
->event
.xSourceLp
= HvLpConfig_getLpIndex();
357 bevent
->event
.xTargetLp
= viopath_hostLp
;
358 bevent
->event
.xSizeMinus1
=
359 offsetof(struct vioblocklpevent
, u
.rw_data
.dma_info
) +
360 (sizeof(bevent
->u
.rw_data
.dma_info
[0]) * nsg
) - 1;
361 bevent
->event
.xSourceInstanceId
=
362 viopath_sourceinst(viopath_hostLp
);
363 bevent
->event
.xTargetInstanceId
=
364 viopath_targetinst(viopath_hostLp
);
365 bevent
->event
.xCorrelationToken
= (u64
)req
;
366 bevent
->version
= VIOVERSION
;
367 bevent
->disk
= DEVICE_NO(d
);
368 bevent
->u
.rw_data
.offset
= start
;
371 * Copy just the dma information from the sg list
374 for (sgindex
= 0; sgindex
< nsg
; sgindex
++) {
375 bevent
->u
.rw_data
.dma_info
[sgindex
].token
=
376 sg_dma_address(&sg
[sgindex
]);
377 bevent
->u
.rw_data
.dma_info
[sgindex
].len
=
378 sg_dma_len(&sg
[sgindex
]);
381 /* Send the request */
382 hvrc
= HvCallEvent_signalLpEvent(&bevent
->event
);
383 vio_free_event_buffer(viomajorsubtype_blockio
, bevent
);
386 if (hvrc
!= HvLpEvent_Rc_Good
) {
387 printk(VIOD_KERN_WARNING
388 "error sending disk event to OS/400 (rc %d)\n",
392 spin_unlock_irqrestore(&viodasd_spinlock
, flags
);
396 num_req_outstanding
--;
397 spin_unlock_irqrestore(&viodasd_spinlock
, flags
);
398 dma_unmap_sg(d
->dev
, sg
, nsg
, direction
);
403 * This is the external request processing routine
405 static void do_viodasd_request(request_queue_t
*q
)
410 * If we already have the maximum number of requests
411 * outstanding to OS/400 just bail out. We'll come
414 while (num_req_outstanding
< VIOMAXREQ
) {
415 req
= elv_next_request(q
);
418 /* dequeue the current request from the queue */
419 blkdev_dequeue_request(req
);
420 /* check that request contains a valid command */
421 if (!blk_fs_request(req
)) {
422 viodasd_end_request(req
, 0, req
->hard_nr_sectors
);
425 /* Try sending the request */
426 if (send_request(req
) != 0)
427 viodasd_end_request(req
, 0, req
->hard_nr_sectors
);
432 * Probe a single disk and fill in the viodasd_device structure
435 static void probe_disk(struct viodasd_device
*d
)
438 struct viodasd_waitevent we
;
439 int dev_no
= DEVICE_NO(d
);
441 struct request_queue
*q
;
445 init_completion(&we
.com
);
447 /* Send the open event to OS/400 */
448 hvrc
= HvCallEvent_signalLpEventFast(viopath_hostLp
,
449 HvLpEvent_Type_VirtualIo
,
450 viomajorsubtype_blockio
| vioblockopen
,
451 HvLpEvent_AckInd_DoAck
, HvLpEvent_AckType_ImmediateAck
,
452 viopath_sourceinst(viopath_hostLp
),
453 viopath_targetinst(viopath_hostLp
),
454 (u64
)(unsigned long)&we
, VIOVERSION
<< 16,
455 ((u64
)dev_no
<< 48) | ((u64
)flags
<< 32),
458 printk(VIOD_KERN_WARNING
"bad rc on HV open %d\n", (int)hvrc
);
462 wait_for_completion(&we
.com
);
467 /* try again with read only flag set */
468 flags
= vioblockflags_ro
;
471 if (we
.max_disk
> (MAX_DISKNO
- 1)) {
476 printk(VIOD_KERN_INFO
477 "Only examining the first %d "
478 "of %d disks connected\n",
479 MAX_DISKNO
, we
.max_disk
+ 1);
483 /* Send the close event to OS/400. We DON'T expect a response */
484 hvrc
= HvCallEvent_signalLpEventFast(viopath_hostLp
,
485 HvLpEvent_Type_VirtualIo
,
486 viomajorsubtype_blockio
| vioblockclose
,
487 HvLpEvent_AckInd_NoAck
, HvLpEvent_AckType_ImmediateAck
,
488 viopath_sourceinst(viopath_hostLp
),
489 viopath_targetinst(viopath_hostLp
),
491 ((u64
)dev_no
<< 48) | ((u64
)flags
<< 32),
494 printk(VIOD_KERN_WARNING
495 "bad rc sending event to OS/400 %d\n", (int)hvrc
);
498 /* create the request queue for the disk */
499 spin_lock_init(&d
->q_lock
);
500 q
= blk_init_queue(do_viodasd_request
, &d
->q_lock
);
502 printk(VIOD_KERN_WARNING
"cannot allocate queue for disk %d\n",
506 g
= alloc_disk(1 << PARTITION_SHIFT
);
508 printk(VIOD_KERN_WARNING
509 "cannot allocate disk structure for disk %d\n",
511 blk_cleanup_queue(q
);
516 blk_queue_max_hw_segments(q
, VIOMAXBLOCKDMA
);
517 blk_queue_max_phys_segments(q
, VIOMAXBLOCKDMA
);
518 blk_queue_max_sectors(q
, VIODASD_MAXSECTORS
);
519 g
->major
= VIODASD_MAJOR
;
520 g
->first_minor
= dev_no
<< PARTITION_SHIFT
;
522 snprintf(g
->disk_name
, sizeof(g
->disk_name
),
523 VIOD_GENHD_NAME
"%c%c",
524 'a' + (dev_no
/ 26) - 1, 'a' + (dev_no
% 26));
526 snprintf(g
->disk_name
, sizeof(g
->disk_name
),
527 VIOD_GENHD_NAME
"%c", 'a' + (dev_no
% 26));
528 snprintf(g
->devfs_name
, sizeof(g
->devfs_name
),
529 "%s%d", VIOD_GENHD_DEVFS_NAME
, dev_no
);
530 g
->fops
= &viodasd_fops
;
533 g
->driverfs_dev
= d
->dev
;
534 set_capacity(g
, d
->size
>> 9);
536 printk(VIOD_KERN_INFO
"disk %d: %lu sectors (%lu MB) "
537 "CHS=%d/%d/%d sector size %d%s\n",
538 dev_no
, (unsigned long)(d
->size
>> 9),
539 (unsigned long)(d
->size
>> 20),
540 (int)d
->cylinders
, (int)d
->tracks
,
541 (int)d
->sectors
, (int)d
->bytes_per_sector
,
542 d
->read_only
? " (RO)" : "");
544 /* register us in the global list */
548 /* returns the total number of scatterlist elements converted */
549 static int block_event_to_scatterlist(const struct vioblocklpevent
*bevent
,
550 struct scatterlist
*sg
, int *total_len
)
553 const struct rw_data
*rw_data
= &bevent
->u
.rw_data
;
554 static const int offset
=
555 offsetof(struct vioblocklpevent
, u
.rw_data
.dma_info
);
556 static const int element_size
= sizeof(rw_data
->dma_info
[0]);
558 numsg
= ((bevent
->event
.xSizeMinus1
+ 1) - offset
) / element_size
;
559 if (numsg
> VIOMAXBLOCKDMA
)
560 numsg
= VIOMAXBLOCKDMA
;
563 memset(sg
, 0, sizeof(sg
[0]) * VIOMAXBLOCKDMA
);
565 for (i
= 0; (i
< numsg
) && (rw_data
->dma_info
[i
].len
> 0); ++i
) {
566 sg_dma_address(&sg
[i
]) = rw_data
->dma_info
[i
].token
;
567 sg_dma_len(&sg
[i
]) = rw_data
->dma_info
[i
].len
;
568 *total_len
+= rw_data
->dma_info
[i
].len
;
574 * Restart all queues, starting with the one _after_ the disk given,
575 * thus reducing the chance of starvation of higher numbered disks.
577 static void viodasd_restart_all_queues_starting_from(int first_index
)
581 for (i
= first_index
+ 1; i
< MAX_DISKNO
; ++i
)
582 if (viodasd_devices
[i
].disk
)
583 blk_run_queue(viodasd_devices
[i
].disk
->queue
);
584 for (i
= 0; i
<= first_index
; ++i
)
585 if (viodasd_devices
[i
].disk
)
586 blk_run_queue(viodasd_devices
[i
].disk
->queue
);
590 * For read and write requests, decrement the number of outstanding requests,
591 * Free the DMA buffers we allocated.
593 static int viodasd_handle_read_write(struct vioblocklpevent
*bevent
)
595 int num_sg
, num_sect
, pci_direction
, total_len
;
597 struct scatterlist sg
[VIOMAXBLOCKDMA
];
598 struct HvLpEvent
*event
= &bevent
->event
;
599 unsigned long irq_flags
;
600 struct viodasd_device
*d
;
604 num_sg
= block_event_to_scatterlist(bevent
, sg
, &total_len
);
605 num_sect
= total_len
>> 9;
606 if (event
->xSubtype
== (viomajorsubtype_blockio
| vioblockread
))
607 pci_direction
= DMA_FROM_DEVICE
;
609 pci_direction
= DMA_TO_DEVICE
;
610 req
= (struct request
*)bevent
->event
.xCorrelationToken
;
611 d
= req
->rq_disk
->private_data
;
613 dma_unmap_sg(d
->dev
, sg
, num_sg
, pci_direction
);
616 * Since this is running in interrupt mode, we need to make sure
617 * we're not stepping on any global I/O operations
619 spin_lock_irqsave(&viodasd_spinlock
, irq_flags
);
620 num_req_outstanding
--;
621 spin_unlock_irqrestore(&viodasd_spinlock
, irq_flags
);
623 error
= event
->xRc
!= HvLpEvent_Rc_Good
;
625 const struct vio_error_entry
*err
;
626 err
= vio_lookup_rc(viodasd_err_table
, bevent
->sub_result
);
627 printk(VIOD_KERN_WARNING
"read/write error %d:0x%04x (%s)\n",
628 event
->xRc
, bevent
->sub_result
, err
->msg
);
629 num_sect
= req
->hard_nr_sectors
;
631 qlock
= req
->q
->queue_lock
;
632 spin_lock_irqsave(qlock
, irq_flags
);
633 viodasd_end_request(req
, !error
, num_sect
);
634 spin_unlock_irqrestore(qlock
, irq_flags
);
636 /* Finally, try to get more requests off of this device's queue */
637 viodasd_restart_all_queues_starting_from(DEVICE_NO(d
));
642 /* This routine handles incoming block LP events */
643 static void handle_block_event(struct HvLpEvent
*event
)
645 struct vioblocklpevent
*bevent
= (struct vioblocklpevent
*)event
;
646 struct viodasd_waitevent
*pwe
;
649 /* Notification that a partition went away! */
651 /* First, we should NEVER get an int here...only acks */
652 if (event
->xFlags
.xFunction
== HvLpEvent_Function_Int
) {
653 printk(VIOD_KERN_WARNING
654 "Yikes! got an int in viodasd event handler!\n");
655 if (event
->xFlags
.xAckInd
== HvLpEvent_AckInd_DoAck
) {
656 event
->xRc
= HvLpEvent_Rc_InvalidSubtype
;
657 HvCallEvent_ackLpEvent(event
);
661 switch (event
->xSubtype
& VIOMINOR_SUBTYPE_MASK
) {
664 * Handle a response to an open request. We get all the
665 * disk information in the response, so update it. The
666 * correlation token contains a pointer to a waitevent
667 * structure that has a completion in it. update the
668 * return code in the waitevent structure and post the
669 * completion to wake up the guy who sent the request
671 pwe
= (struct viodasd_waitevent
*)event
->xCorrelationToken
;
672 pwe
->rc
= event
->xRc
;
673 pwe
->sub_result
= bevent
->sub_result
;
674 if (event
->xRc
== HvLpEvent_Rc_Good
) {
675 const struct open_data
*data
= &bevent
->u
.open_data
;
676 struct viodasd_device
*device
=
677 &viodasd_devices
[bevent
->disk
];
679 bevent
->flags
& vioblockflags_ro
;
680 device
->size
= data
->disk_size
;
681 device
->cylinders
= data
->cylinders
;
682 device
->tracks
= data
->tracks
;
683 device
->sectors
= data
->sectors
;
684 device
->bytes_per_sector
= data
->bytes_per_sector
;
685 pwe
->max_disk
= data
->max_disk
;
693 viodasd_handle_read_write(bevent
);
697 printk(VIOD_KERN_WARNING
"invalid subtype!");
698 if (event
->xFlags
.xAckInd
== HvLpEvent_AckInd_DoAck
) {
699 event
->xRc
= HvLpEvent_Rc_InvalidSubtype
;
700 HvCallEvent_ackLpEvent(event
);
706 * Get the driver to reprobe for more disks.
708 static ssize_t
probe_disks(struct device_driver
*drv
, const char *buf
,
711 struct viodasd_device
*d
;
713 for (d
= viodasd_devices
; d
< &viodasd_devices
[MAX_DISKNO
]; d
++) {
719 static DRIVER_ATTR(probe
, S_IWUSR
, NULL
, probe_disks
);
721 static int viodasd_probe(struct vio_dev
*vdev
, const struct vio_device_id
*id
)
723 struct viodasd_device
*d
= &viodasd_devices
[vdev
->unit_address
];
732 static int viodasd_remove(struct vio_dev
*vdev
)
734 struct viodasd_device
*d
;
736 d
= &viodasd_devices
[vdev
->unit_address
];
738 del_gendisk(d
->disk
);
739 blk_cleanup_queue(d
->disk
->queue
);
748 * viodasd_device_table: Used by vio.c to match devices that we
751 static struct vio_device_id viodasd_device_table
[] __devinitdata
= {
755 MODULE_DEVICE_TABLE(vio
, viodasd_device_table
);
757 static struct vio_driver viodasd_driver
= {
758 .id_table
= viodasd_device_table
,
759 .probe
= viodasd_probe
,
760 .remove
= viodasd_remove
,
763 .owner
= THIS_MODULE
,
768 * Initialize the whole device driver. Handle module and non-module
771 static int __init
viodasd_init(void)
775 /* Try to open to our host lp */
776 if (viopath_hostLp
== HvLpIndexInvalid
)
779 if (viopath_hostLp
== HvLpIndexInvalid
) {
780 printk(VIOD_KERN_WARNING
"invalid hosting partition\n");
784 printk(VIOD_KERN_INFO
"vers " VIOD_VERS
", hosting partition %d\n",
787 /* register the block device */
788 if (register_blkdev(VIODASD_MAJOR
, VIOD_GENHD_NAME
)) {
789 printk(VIOD_KERN_WARNING
790 "Unable to get major number %d for %s\n",
791 VIODASD_MAJOR
, VIOD_GENHD_NAME
);
794 /* Actually open the path to the hosting partition */
795 if (viopath_open(viopath_hostLp
, viomajorsubtype_blockio
,
797 printk(VIOD_KERN_WARNING
798 "error opening path to host partition %d\n",
800 unregister_blkdev(VIODASD_MAJOR
, VIOD_GENHD_NAME
);
804 /* Initialize our request handler */
805 vio_setHandler(viomajorsubtype_blockio
, handle_block_event
);
807 rc
= vio_register_driver(&viodasd_driver
);
809 driver_create_file(&viodasd_driver
.driver
, &driver_attr_probe
);
812 module_init(viodasd_init
);
814 void viodasd_exit(void)
816 driver_remove_file(&viodasd_driver
.driver
, &driver_attr_probe
);
817 vio_unregister_driver(&viodasd_driver
);
818 vio_clearHandler(viomajorsubtype_blockio
);
819 unregister_blkdev(VIODASD_MAJOR
, VIOD_GENHD_NAME
);
820 viopath_close(viopath_hostLp
, viomajorsubtype_blockio
, VIOMAXREQ
+ 2);
823 module_exit(viodasd_exit
);