4 * Copyright (C) 1999-2002 Red Hat Software
6 * Written by Alan Cox, Building Number Three Ltd
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * For the purpose of avoiding doubt the preferred form of the work
19 * for making modifications shall be a standards compliant form such
20 * gzipped tar and not one requiring a proprietary or patent encumbered
25 * Multiple device handling error fixes,
26 * Added a queue depth.
28 * FC920 has an rmw bug. Dont or in the end marker.
29 * Removed queue walk, fixed for 64bitness.
30 * Rewrote much of the code over time
31 * Added indirect block lists
32 * Handle 64K limits on many controllers
33 * Don't use indirects on the Promise (breaks)
34 * Heavily chop down the queue depths
36 * Independent queues per IOP
37 * Support for dynamic device creation/deletion
39 * Support for larger I/Os through merge* functions
40 * (taken from DAC960 driver)
41 * Boji T Kannanthanam:
42 * Set the I2O Block devices to be detected in increasing
43 * order of TIDs during boot.
44 * Search and set the I2O block device that we boot off
45 * from as the first device to be claimed (as /dev/i2o/hda)
46 * Properly attach/detach I2O gendisk structure from the
47 * system gendisk list. The I2O block devices now appear in
49 * Markus Lidel <Markus.Lidel@shadowconnect.com>:
50 * Minor bugfixes for 2.6.
53 #include <linux/module.h>
54 #include <linux/slab.h>
55 #include <linux/i2o.h>
57 #include <linux/mempool.h>
59 #include <linux/genhd.h>
60 #include <linux/blkdev.h>
61 #include <linux/hdreg.h>
63 #include <scsi/scsi.h>
65 #include "i2o_block.h"
67 #define OSM_NAME "block-osm"
68 #define OSM_VERSION "1.325"
69 #define OSM_DESCRIPTION "I2O Block Device OSM"
71 static struct i2o_driver i2o_block_driver;
73 /* global Block OSM request mempool */
74 static struct i2o_block_mempool i2o_blk_req_pool;
76 /* Block OSM class handling definition */
77 static struct i2o_class_id i2o_block_class_id[] = {
78 {I2O_CLASS_RANDOM_BLOCK_STORAGE},
83 * i2o_block_device_free - free the memory of the I2O Block device
84 * @dev: I2O Block device, which should be cleaned up
86 * Frees the request queue, gendisk and the i2o_block_device structure.
88 static void i2o_block_device_free(struct i2o_block_device *dev)
90 blk_cleanup_queue(dev->gd->queue);
98 * i2o_block_remove - remove the I2O Block device from the system again
99 * @dev: I2O Block device which should be removed
101 * Remove gendisk from system and free all allocated memory.
105 static int i2o_block_remove(struct device *dev)
107 struct i2o_device *i2o_dev = to_i2o_device(dev);
108 struct i2o_block_device *i2o_blk_dev = dev_get_drvdata(dev);
110 osm_info("device removed (TID: %03x): %s\n", i2o_dev->lct_data.tid,
111 i2o_blk_dev->gd->disk_name);
113 i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0);
115 del_gendisk(i2o_blk_dev->gd);
117 dev_set_drvdata(dev, NULL);
119 i2o_device_claim_release(i2o_dev);
121 i2o_block_device_free(i2o_blk_dev);
127 * i2o_block_device flush - Flush all dirty data of I2O device dev
128 * @dev: I2O device which should be flushed
130 * Flushes all dirty data on device dev.
132 * Returns 0 on success or negative error code on failure.
134 static int i2o_block_device_flush(struct i2o_device *dev)
136 struct i2o_message *msg;
138 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
142 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
144 cpu_to_le32(I2O_CMD_BLOCK_CFLUSH << 24 | HOST_TID << 12 | dev->
146 msg->body[0] = cpu_to_le32(60 << 16);
147 osm_debug("Flushing...\n");
149 return i2o_msg_post_wait(dev->iop, msg, 60);
153 * i2o_block_device_mount - Mount (load) the media of device dev
154 * @dev: I2O device which should receive the mount request
155 * @media_id: Media Identifier
157 * Load a media into drive. Identifier should be set to -1, because the
158 * spec does not support any other value.
160 * Returns 0 on success or negative error code on failure.
162 static int i2o_block_device_mount(struct i2o_device *dev, u32 media_id)
164 struct i2o_message *msg;
166 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
170 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
172 cpu_to_le32(I2O_CMD_BLOCK_MMOUNT << 24 | HOST_TID << 12 | dev->
174 msg->body[0] = cpu_to_le32(-1);
175 msg->body[1] = cpu_to_le32(0x00000000);
176 osm_debug("Mounting...\n");
178 return i2o_msg_post_wait(dev->iop, msg, 2);
182 * i2o_block_device_lock - Locks the media of device dev
183 * @dev: I2O device which should receive the lock request
184 * @media_id: Media Identifier
186 * Lock media of device dev to prevent removal. The media identifier
187 * should be set to -1, because the spec does not support any other value.
189 * Returns 0 on success or negative error code on failure.
191 static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id)
193 struct i2o_message *msg;
195 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
199 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
201 cpu_to_le32(I2O_CMD_BLOCK_MLOCK << 24 | HOST_TID << 12 | dev->
203 msg->body[0] = cpu_to_le32(-1);
204 osm_debug("Locking...\n");
206 return i2o_msg_post_wait(dev->iop, msg, 2);
210 * i2o_block_device_unlock - Unlocks the media of device dev
211 * @dev: I2O device which should receive the unlocked request
212 * @media_id: Media Identifier
214 * Unlocks the media in device dev. The media identifier should be set to
215 * -1, because the spec does not support any other value.
217 * Returns 0 on success or negative error code on failure.
219 static int i2o_block_device_unlock(struct i2o_device *dev, u32 media_id)
221 struct i2o_message *msg;
223 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
227 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
229 cpu_to_le32(I2O_CMD_BLOCK_MUNLOCK << 24 | HOST_TID << 12 | dev->
231 msg->body[0] = cpu_to_le32(media_id);
232 osm_debug("Unlocking...\n");
234 return i2o_msg_post_wait(dev->iop, msg, 2);
238 * i2o_block_device_power - Power management for device dev
239 * @dev: I2O device which should receive the power management request
240 * @op: Operation to send
242 * Send a power management request to the device dev.
244 * Returns 0 on success or negative error code on failure.
246 static int i2o_block_device_power(struct i2o_block_device *dev, u8 op)
248 struct i2o_device *i2o_dev = dev->i2o_dev;
249 struct i2o_controller *c = i2o_dev->iop;
250 struct i2o_message *msg;
253 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
257 msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0);
259 cpu_to_le32(I2O_CMD_BLOCK_POWER << 24 | HOST_TID << 12 | i2o_dev->
261 msg->body[0] = cpu_to_le32(op << 24);
262 osm_debug("Power...\n");
264 rc = i2o_msg_post_wait(c, msg, 60);
272 * i2o_block_request_alloc - Allocate an I2O block request struct
274 * Allocates an I2O block request struct and initialize the list.
276 * Returns a i2o_block_request pointer on success or negative error code
279 static inline struct i2o_block_request *i2o_block_request_alloc(void)
281 struct i2o_block_request *ireq;
283 ireq = mempool_alloc(i2o_blk_req_pool.pool, GFP_ATOMIC);
285 return ERR_PTR(-ENOMEM);
287 INIT_LIST_HEAD(&ireq->queue);
288 sg_init_table(ireq->sg_table, I2O_MAX_PHYS_SEGMENTS);
294 * i2o_block_request_free - Frees a I2O block request
295 * @ireq: I2O block request which should be freed
297 * Frees the allocated memory (give it back to the request mempool).
299 static inline void i2o_block_request_free(struct i2o_block_request *ireq)
301 mempool_free(ireq, i2o_blk_req_pool.pool);
305 * i2o_block_sglist_alloc - Allocate the SG list and map it
306 * @c: I2O controller to which the request belongs
307 * @ireq: I2O block request
308 * @mptr: message body pointer
310 * Builds the SG list and map it to be accessable by the controller.
312 * Returns 0 on failure or 1 on success.
314 static inline int i2o_block_sglist_alloc(struct i2o_controller *c,
315 struct i2o_block_request *ireq,
319 enum dma_data_direction direction;
321 ireq->dev = &c->pdev->dev;
322 nents = blk_rq_map_sg(ireq->req->q, ireq->req, ireq->sg_table);
324 if (rq_data_dir(ireq->req) == READ)
325 direction = PCI_DMA_FROMDEVICE;
327 direction = PCI_DMA_TODEVICE;
329 ireq->sg_nents = nents;
331 return i2o_dma_map_sg(c, ireq->sg_table, nents, direction, mptr);
335 * i2o_block_sglist_free - Frees the SG list
336 * @ireq: I2O block request from which the SG should be freed
338 * Frees the SG list from the I2O block request.
340 static inline void i2o_block_sglist_free(struct i2o_block_request *ireq)
342 enum dma_data_direction direction;
344 if (rq_data_dir(ireq->req) == READ)
345 direction = PCI_DMA_FROMDEVICE;
347 direction = PCI_DMA_TODEVICE;
349 dma_unmap_sg(ireq->dev, ireq->sg_table, ireq->sg_nents, direction);
353 * i2o_block_prep_req_fn - Allocates I2O block device specific struct
354 * @q: request queue for the request
355 * @req: the request to prepare
357 * Allocate the necessary i2o_block_request struct and connect it to
358 * the request. This is needed that we not lose the SG list later on.
360 * Returns BLKPREP_OK on success or BLKPREP_DEFER on failure.
362 static int i2o_block_prep_req_fn(struct request_queue *q, struct request *req)
364 struct i2o_block_device *i2o_blk_dev = q->queuedata;
365 struct i2o_block_request *ireq;
367 if (unlikely(!i2o_blk_dev)) {
368 osm_err("block device already removed\n");
372 /* connect the i2o_block_request to the request */
374 ireq = i2o_block_request_alloc();
376 osm_debug("unable to allocate i2o_block_request!\n");
377 return BLKPREP_DEFER;
380 ireq->i2o_blk_dev = i2o_blk_dev;
384 /* do not come back here */
385 req->cmd_flags |= REQ_DONTPREP;
391 * i2o_block_delayed_request_fn - delayed request queue function
392 * @work: the delayed request with the queue to start
394 * If the request queue is stopped for a disk, and there is no open
395 * request, a new event is created, which calls this function to start
396 * the queue after I2O_BLOCK_REQUEST_TIME. Otherwise the queue will never
399 static void i2o_block_delayed_request_fn(struct work_struct *work)
401 struct i2o_block_delayed_request *dreq =
402 container_of(work, struct i2o_block_delayed_request,
404 struct request_queue *q = dreq->queue;
407 spin_lock_irqsave(q->queue_lock, flags);
409 spin_unlock_irqrestore(q->queue_lock, flags);
414 * i2o_block_end_request - Post-processing of completed commands
415 * @req: request which should be completed
416 * @error: 0 for success, < 0 for error
417 * @nr_bytes: number of bytes to complete
419 * Mark the request as complete. The lock must not be held when entering.
422 static void i2o_block_end_request(struct request *req, int error,
425 struct i2o_block_request *ireq = req->special;
426 struct i2o_block_device *dev = ireq->i2o_blk_dev;
427 struct request_queue *q = req->q;
430 if (blk_end_request(req, error, nr_bytes))
432 blk_end_request_all(req, -EIO);
434 spin_lock_irqsave(q->queue_lock, flags);
437 dev->open_queue_depth--;
438 list_del(&ireq->queue);
443 spin_unlock_irqrestore(q->queue_lock, flags);
445 i2o_block_sglist_free(ireq);
446 i2o_block_request_free(ireq);
450 * i2o_block_reply - Block OSM reply handler.
451 * @c: I2O controller from which the message arrives
452 * @m: message id of reply
453 * @msg: the actual I2O message reply
455 * This function gets all the message replies.
458 static int i2o_block_reply(struct i2o_controller *c, u32 m,
459 struct i2o_message *msg)
464 req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
465 if (unlikely(!req)) {
466 osm_err("NULL reply received!\n");
471 * Lets see what is cooking. We stuffed the
472 * request in the context.
475 if ((le32_to_cpu(msg->body[0]) >> 24) != 0) {
476 u32 status = le32_to_cpu(msg->body[0]);
478 * Device not ready means two things. One is that the
479 * the thing went offline (but not a removal media)
481 * The second is that you have a SuperTrak 100 and the
482 * firmware got constipated. Unlike standard i2o card
483 * setups the supertrak returns an error rather than
484 * blocking for the timeout in these cases.
486 * Don't stick a supertrak100 into cache aggressive modes
489 osm_err("TID %03x error status: 0x%02x, detailed status: "
490 "0x%04x\n", (le32_to_cpu(msg->u.head[1]) >> 12 & 0xfff),
491 status >> 24, status & 0xffff);
498 i2o_block_end_request(req, error, le32_to_cpu(msg->body[1]));
503 static void i2o_block_event(struct work_struct *work)
505 struct i2o_event *evt = container_of(work, struct i2o_event, work);
506 osm_debug("event received\n");
511 * SCSI-CAM for ioctl geometry mapping
512 * Duplicated with SCSI - this should be moved into somewhere common
515 * LBA -> CHS mapping table taken from:
517 * "Incorporating the I2O Architecture into BIOS for Intel Architecture
520 * This is an I2O document that is only available to I2O members,
523 * From my understanding, this is how all the I2O cards do this
525 * Disk Size | Sectors | Heads | Cylinders
526 * ---------------+---------+-------+-------------------
527 * 1 < X <= 528M | 63 | 16 | X/(63 * 16 * 512)
528 * 528M < X <= 1G | 63 | 32 | X/(63 * 32 * 512)
529 * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512)
530 * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512)
533 #define BLOCK_SIZE_528M 1081344
534 #define BLOCK_SIZE_1G 2097152
535 #define BLOCK_SIZE_21G 4403200
536 #define BLOCK_SIZE_42G 8806400
537 #define BLOCK_SIZE_84G 17612800
539 static void i2o_block_biosparam(unsigned long capacity, unsigned short *cyls,
540 unsigned char *hds, unsigned char *secs)
542 unsigned long heads, sectors, cylinders;
544 sectors = 63L; /* Maximize sectors per track */
545 if (capacity <= BLOCK_SIZE_528M)
547 else if (capacity <= BLOCK_SIZE_1G)
549 else if (capacity <= BLOCK_SIZE_21G)
551 else if (capacity <= BLOCK_SIZE_42G)
556 cylinders = (unsigned long)capacity / (heads * sectors);
558 *cyls = (unsigned short)cylinders; /* Stuff return values */
559 *secs = (unsigned char)sectors;
560 *hds = (unsigned char)heads;
564 * i2o_block_open - Open the block device
565 * @bdev: block device being opened
566 * @mode: file open mode
568 * Power up the device, mount and lock the media. This function is called,
569 * if the block device is opened for access.
571 * Returns 0 on success or negative error code on failure.
573 static int i2o_block_open(struct block_device *bdev, fmode_t mode)
575 struct i2o_block_device *dev = bdev->bd_disk->private_data;
580 if (dev->power > 0x1f)
581 i2o_block_device_power(dev, 0x02);
583 i2o_block_device_mount(dev->i2o_dev, -1);
585 i2o_block_device_lock(dev->i2o_dev, -1);
587 osm_debug("Ready.\n");
593 * i2o_block_release - Release the I2O block device
594 * @disk: gendisk device being released
595 * @mode: file open mode
597 * Unlock and unmount the media, and power down the device. Gets called if
598 * the block device is closed.
600 * Returns 0 on success or negative error code on failure.
602 static int i2o_block_release(struct gendisk *disk, fmode_t mode)
604 struct i2o_block_device *dev = disk->private_data;
608 * This is to deail with the case of an application
609 * opening a device and then the device dissapears while
610 * it's in use, and then the application tries to release
611 * it. ex: Unmounting a deleted RAID volume at reboot.
612 * If we send messages, it will just cause FAILs since
613 * the TID no longer exists.
618 i2o_block_device_flush(dev->i2o_dev);
620 i2o_block_device_unlock(dev->i2o_dev, -1);
622 if (dev->flags & (1 << 3 | 1 << 4)) /* Removable */
627 i2o_block_device_power(dev, operation);
632 static int i2o_block_getgeo(struct block_device *bdev, struct hd_geometry *geo)
634 i2o_block_biosparam(get_capacity(bdev->bd_disk),
635 &geo->cylinders, &geo->heads, &geo->sectors);
640 * i2o_block_ioctl - Issue device specific ioctl calls.
641 * @bdev: block device being opened
642 * @mode: file open mode
643 * @cmd: ioctl command
646 * Handles ioctl request for the block device.
648 * Return 0 on success or negative error on failure.
650 static int i2o_block_ioctl(struct block_device *bdev, fmode_t mode,
651 unsigned int cmd, unsigned long arg)
653 struct gendisk *disk = bdev->bd_disk;
654 struct i2o_block_device *dev = disk->private_data;
656 /* Anyone capable of this syscall can do *real bad* things */
658 if (!capable(CAP_SYS_ADMIN))
663 return put_user(dev->rcache, (int __user *)arg);
665 return put_user(dev->wcache, (int __user *)arg);
667 if (arg < 0 || arg > CACHE_SMARTFETCH)
673 && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK))
682 * i2o_block_media_changed - Have we seen a media change?
683 * @disk: gendisk which should be verified
685 * Verifies if the media has changed.
687 * Returns 1 if the media was changed or 0 otherwise.
689 static int i2o_block_media_changed(struct gendisk *disk)
691 struct i2o_block_device *p = disk->private_data;
693 if (p->media_change_flag) {
694 p->media_change_flag = 0;
701 * i2o_block_transfer - Transfer a request to/from the I2O controller
702 * @req: the request which should be transfered
704 * This function converts the request into a I2O message. The necessary
705 * DMA buffers are allocated and after everything is setup post the message
706 * to the I2O controller. No cleanup is done by this function. It is done
707 * on the interrupt side when the reply arrives.
709 * Return 0 on success or negative error code on failure.
711 static int i2o_block_transfer(struct request *req)
713 struct i2o_block_device *dev = req->rq_disk->private_data;
714 struct i2o_controller *c;
715 u32 tid = dev->i2o_dev->lct_data.tid;
716 struct i2o_message *msg;
718 struct i2o_block_request *ireq = req->special;
720 u32 sgl_offset = SGL_OFFSET_8;
721 u32 ctl_flags = 0x00000000;
725 if (unlikely(!dev->i2o_dev)) {
726 osm_err("transfer to removed drive\n");
731 c = dev->i2o_dev->iop;
733 msg = i2o_msg_get(c);
739 tcntxt = i2o_cntxt_list_add(c, req);
745 msg->u.s.icntxt = cpu_to_le32(i2o_block_driver.context);
746 msg->u.s.tcntxt = cpu_to_le32(tcntxt);
748 mptr = &msg->body[0];
750 if (rq_data_dir(req) == READ) {
751 cmd = I2O_CMD_BLOCK_READ << 24;
753 switch (dev->rcache) {
755 ctl_flags = 0x201F0008;
758 case CACHE_SMARTFETCH:
759 if (blk_rq_sectors(req) > 16)
760 ctl_flags = 0x201F0008;
762 ctl_flags = 0x001F0000;
769 cmd = I2O_CMD_BLOCK_WRITE << 24;
771 switch (dev->wcache) {
772 case CACHE_WRITETHROUGH:
773 ctl_flags = 0x001F0008;
775 case CACHE_WRITEBACK:
776 ctl_flags = 0x001F0010;
778 case CACHE_SMARTBACK:
779 if (blk_rq_sectors(req) > 16)
780 ctl_flags = 0x001F0004;
782 ctl_flags = 0x001F0010;
784 case CACHE_SMARTTHROUGH:
785 if (blk_rq_sectors(req) > 16)
786 ctl_flags = 0x001F0004;
788 ctl_flags = 0x001F0010;
794 #ifdef CONFIG_I2O_EXT_ADAPTEC
800 hwsec = queue_logical_block_size(req->q) >> KERNEL_SECTOR_SHIFT;
803 sgl_offset = SGL_OFFSET_12;
806 cpu_to_le32(I2O_CMD_PRIVATE << 24 | HOST_TID << 12 | tid);
808 *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC);
809 *mptr++ = cpu_to_le32(tid);
814 * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME
816 if (rq_data_dir(req) == READ) {
818 scsi_flags = 0x60a0000a;
821 scsi_flags = 0xa0a0000a;
824 *mptr++ = cpu_to_le32(scsi_flags);
826 *((u32 *) & cmd[2]) = cpu_to_be32(blk_rq_pos(req) * hwsec);
827 *((u16 *) & cmd[7]) = cpu_to_be16(blk_rq_sectors(req) * hwsec);
829 memcpy(mptr, cmd, 10);
831 *mptr++ = cpu_to_le32(blk_rq_bytes(req));
835 msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid);
836 *mptr++ = cpu_to_le32(ctl_flags);
837 *mptr++ = cpu_to_le32(blk_rq_bytes(req));
839 cpu_to_le32((u32) (blk_rq_pos(req) << KERNEL_SECTOR_SHIFT));
841 cpu_to_le32(blk_rq_pos(req) >> (32 - KERNEL_SECTOR_SHIFT));
844 if (!i2o_block_sglist_alloc(c, ireq, &mptr)) {
850 cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset);
852 list_add_tail(&ireq->queue, &dev->open_queue);
853 dev->open_queue_depth++;
855 i2o_msg_post(c, msg);
860 i2o_cntxt_list_remove(c, req);
870 * i2o_block_request_fn - request queue handling function
871 * @q: request queue from which the request could be fetched
873 * Takes the next request from the queue, transfers it and if no error
874 * occurs dequeue it from the queue. On arrival of the reply the message
875 * will be processed further. If an error occurs requeue the request.
877 static void i2o_block_request_fn(struct request_queue *q)
881 while (!blk_queue_plugged(q)) {
882 req = blk_peek_request(q);
886 if (blk_fs_request(req)) {
887 struct i2o_block_delayed_request *dreq;
888 struct i2o_block_request *ireq = req->special;
889 unsigned int queue_depth;
891 queue_depth = ireq->i2o_blk_dev->open_queue_depth;
893 if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS) {
894 if (!i2o_block_transfer(req)) {
895 blk_start_request(req);
898 osm_info("transfer error\n");
904 /* stop the queue and retry later */
905 dreq = kmalloc(sizeof(*dreq), GFP_ATOMIC);
910 INIT_DELAYED_WORK(&dreq->work,
911 i2o_block_delayed_request_fn);
913 if (!queue_delayed_work(i2o_block_driver.event_queue,
915 I2O_BLOCK_RETRY_TIME))
922 blk_start_request(req);
923 __blk_end_request_all(req, -EIO);
928 /* I2O Block device operations definition */
929 static const struct block_device_operations i2o_block_fops = {
930 .owner = THIS_MODULE,
931 .open = i2o_block_open,
932 .release = i2o_block_release,
933 .locked_ioctl = i2o_block_ioctl,
934 .getgeo = i2o_block_getgeo,
935 .media_changed = i2o_block_media_changed
939 * i2o_block_device_alloc - Allocate memory for a I2O Block device
941 * Allocate memory for the i2o_block_device struct, gendisk and request
942 * queue and initialize them as far as no additional information is needed.
944 * Returns a pointer to the allocated I2O Block device on success or a
945 * negative error code on failure.
947 static struct i2o_block_device *i2o_block_device_alloc(void)
949 struct i2o_block_device *dev;
951 struct request_queue *queue;
954 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
956 osm_err("Insufficient memory to allocate I2O Block disk.\n");
961 INIT_LIST_HEAD(&dev->open_queue);
962 spin_lock_init(&dev->lock);
963 dev->rcache = CACHE_PREFETCH;
964 dev->wcache = CACHE_WRITEBACK;
966 /* allocate a gendisk with 16 partitions */
969 osm_err("Insufficient memory to allocate gendisk.\n");
974 /* initialize the request queue */
975 queue = blk_init_queue(i2o_block_request_fn, &dev->lock);
977 osm_err("Insufficient memory to allocate request queue.\n");
982 blk_queue_prep_rq(queue, i2o_block_prep_req_fn);
984 gd->major = I2O_MAJOR;
986 gd->fops = &i2o_block_fops;
987 gd->private_data = dev;
1004 * i2o_block_probe - verify if dev is a I2O Block device and install it
1005 * @dev: device to verify if it is a I2O Block device
1007 * We only verify if the user_tid of the device is 0xfff and then install
1008 * the device. Otherwise it is used by some other device (e. g. RAID).
1010 * Returns 0 on success or negative error code on failure.
1012 static int i2o_block_probe(struct device *dev)
1014 struct i2o_device *i2o_dev = to_i2o_device(dev);
1015 struct i2o_controller *c = i2o_dev->iop;
1016 struct i2o_block_device *i2o_blk_dev;
1018 struct request_queue *queue;
1019 static int unit = 0;
1025 unsigned short max_sectors;
1027 #ifdef CONFIG_I2O_EXT_ADAPTEC
1032 if (c->limit_sectors)
1033 max_sectors = I2O_MAX_SECTORS_LIMITED;
1035 max_sectors = I2O_MAX_SECTORS;
1037 /* skip devices which are used by IOP */
1038 if (i2o_dev->lct_data.user_tid != 0xfff) {
1039 osm_debug("skipping used device %03x\n", i2o_dev->lct_data.tid);
1043 if (i2o_device_claim(i2o_dev)) {
1044 osm_warn("Unable to claim device. Installation aborted\n");
1049 i2o_blk_dev = i2o_block_device_alloc();
1050 if (IS_ERR(i2o_blk_dev)) {
1051 osm_err("could not alloc a new I2O block device");
1052 rc = PTR_ERR(i2o_blk_dev);
1056 i2o_blk_dev->i2o_dev = i2o_dev;
1057 dev_set_drvdata(dev, i2o_blk_dev);
1060 gd = i2o_blk_dev->gd;
1061 gd->first_minor = unit << 4;
1062 sprintf(gd->disk_name, "i2o/hd%c", 'a' + unit);
1063 gd->driverfs_dev = &i2o_dev->device;
1065 /* setup request queue */
1067 queue->queuedata = i2o_blk_dev;
1069 blk_queue_max_hw_sectors(queue, max_sectors);
1070 blk_queue_max_segments(queue, i2o_sg_tablesize(c, body_size));
1072 osm_debug("max sectors = %d\n", queue->max_sectors);
1073 osm_debug("phys segments = %d\n", queue->max_phys_segments);
1074 osm_debug("max hw segments = %d\n", queue->max_hw_segments);
1077 * Ask for the current media data. If that isn't supported
1078 * then we ask for the device capacity data
1080 if (!i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4) ||
1081 !i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4)) {
1082 blk_queue_logical_block_size(queue, le32_to_cpu(blocksize));
1084 osm_warn("unable to get blocksize of %s\n", gd->disk_name);
1086 if (!i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8) ||
1087 !i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8)) {
1088 set_capacity(gd, le64_to_cpu(size) >> KERNEL_SECTOR_SHIFT);
1090 osm_warn("could not get size of %s\n", gd->disk_name);
1092 if (!i2o_parm_field_get(i2o_dev, 0x0000, 2, &power, 2))
1093 i2o_blk_dev->power = power;
1095 i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0xffffffff);
1101 osm_info("device added (TID: %03x): %s\n", i2o_dev->lct_data.tid,
1102 i2o_blk_dev->gd->disk_name);
1107 i2o_device_claim_release(i2o_dev);
1113 /* Block OSM driver struct */
1114 static struct i2o_driver i2o_block_driver = {
1116 .event = i2o_block_event,
1117 .reply = i2o_block_reply,
1118 .classes = i2o_block_class_id,
1120 .probe = i2o_block_probe,
1121 .remove = i2o_block_remove,
1126 * i2o_block_init - Block OSM initialization function
1128 * Allocate the slab and mempool for request structs, registers i2o_block
1129 * block device and finally register the Block OSM in the I2O core.
1131 * Returns 0 on success or negative error code on failure.
1133 static int __init i2o_block_init(void)
1138 printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
1140 /* Allocate request mempool and slab */
1141 size = sizeof(struct i2o_block_request);
1142 i2o_blk_req_pool.slab = kmem_cache_create("i2o_block_req", size, 0,
1143 SLAB_HWCACHE_ALIGN, NULL);
1144 if (!i2o_blk_req_pool.slab) {
1145 osm_err("can't init request slab\n");
1150 i2o_blk_req_pool.pool =
1151 mempool_create_slab_pool(I2O_BLOCK_REQ_MEMPOOL_SIZE,
1152 i2o_blk_req_pool.slab);
1153 if (!i2o_blk_req_pool.pool) {
1154 osm_err("can't init request mempool\n");
1159 /* Register the block device interfaces */
1160 rc = register_blkdev(I2O_MAJOR, "i2o_block");
1162 osm_err("unable to register block device\n");
1166 osm_info("registered device at major %d\n", I2O_MAJOR);
1169 /* Register Block OSM into I2O core */
1170 rc = i2o_driver_register(&i2o_block_driver);
1172 osm_err("Could not register Block driver\n");
1173 goto unregister_blkdev;
1179 unregister_blkdev(I2O_MAJOR, "i2o_block");
1182 mempool_destroy(i2o_blk_req_pool.pool);
1185 kmem_cache_destroy(i2o_blk_req_pool.slab);
1192 * i2o_block_exit - Block OSM exit function
1194 * Unregisters Block OSM from I2O core, unregisters i2o_block block device
1195 * and frees the mempool and slab.
1197 static void __exit i2o_block_exit(void)
1199 /* Unregister I2O Block OSM from I2O core */
1200 i2o_driver_unregister(&i2o_block_driver);
1202 /* Unregister block device */
1203 unregister_blkdev(I2O_MAJOR, "i2o_block");
1205 /* Free request mempool and slab */
1206 mempool_destroy(i2o_blk_req_pool.pool);
1207 kmem_cache_destroy(i2o_blk_req_pool.slab);
1210 MODULE_AUTHOR("Red Hat");
1211 MODULE_LICENSE("GPL");
1212 MODULE_DESCRIPTION(OSM_DESCRIPTION);
1213 MODULE_VERSION(OSM_VERSION);
1215 module_init(i2o_block_init);
1216 module_exit(i2o_block_exit);