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>
56 #include <linux/mutex.h>
58 #include <linux/mempool.h>
60 #include <linux/genhd.h>
61 #include <linux/blkdev.h>
62 #include <linux/hdreg.h>
64 #include <scsi/scsi.h>
66 #include "i2o_block.h"
68 #define OSM_NAME "block-osm"
69 #define OSM_VERSION "1.325"
70 #define OSM_DESCRIPTION "I2O Block Device OSM"
72 static DEFINE_MUTEX(i2o_block_mutex);
73 static struct i2o_driver i2o_block_driver;
75 /* global Block OSM request mempool */
76 static struct i2o_block_mempool i2o_blk_req_pool;
78 /* Block OSM class handling definition */
79 static struct i2o_class_id i2o_block_class_id[] = {
80 {I2O_CLASS_RANDOM_BLOCK_STORAGE},
85 * i2o_block_device_free - free the memory of the I2O Block device
86 * @dev: I2O Block device, which should be cleaned up
88 * Frees the request queue, gendisk and the i2o_block_device structure.
90 static void i2o_block_device_free(struct i2o_block_device *dev)
92 blk_cleanup_queue(dev->gd->queue);
100 * i2o_block_remove - remove the I2O Block device from the system again
101 * @dev: I2O Block device which should be removed
103 * Remove gendisk from system and free all allocated memory.
107 static int i2o_block_remove(struct device *dev)
109 struct i2o_device *i2o_dev = to_i2o_device(dev);
110 struct i2o_block_device *i2o_blk_dev = dev_get_drvdata(dev);
112 osm_info("device removed (TID: %03x): %s\n", i2o_dev->lct_data.tid,
113 i2o_blk_dev->gd->disk_name);
115 i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0);
117 del_gendisk(i2o_blk_dev->gd);
119 dev_set_drvdata(dev, NULL);
121 i2o_device_claim_release(i2o_dev);
123 i2o_block_device_free(i2o_blk_dev);
129 * i2o_block_device flush - Flush all dirty data of I2O device dev
130 * @dev: I2O device which should be flushed
132 * Flushes all dirty data on device dev.
134 * Returns 0 on success or negative error code on failure.
136 static int i2o_block_device_flush(struct i2o_device *dev)
138 struct i2o_message *msg;
140 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
144 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
146 cpu_to_le32(I2O_CMD_BLOCK_CFLUSH << 24 | HOST_TID << 12 | dev->
148 msg->body[0] = cpu_to_le32(60 << 16);
149 osm_debug("Flushing...\n");
151 return i2o_msg_post_wait(dev->iop, msg, 60);
155 * i2o_block_device_mount - Mount (load) the media of device dev
156 * @dev: I2O device which should receive the mount request
157 * @media_id: Media Identifier
159 * Load a media into drive. Identifier should be set to -1, because the
160 * spec does not support any other value.
162 * Returns 0 on success or negative error code on failure.
164 static int i2o_block_device_mount(struct i2o_device *dev, u32 media_id)
166 struct i2o_message *msg;
168 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
172 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
174 cpu_to_le32(I2O_CMD_BLOCK_MMOUNT << 24 | HOST_TID << 12 | dev->
176 msg->body[0] = cpu_to_le32(-1);
177 msg->body[1] = cpu_to_le32(0x00000000);
178 osm_debug("Mounting...\n");
180 return i2o_msg_post_wait(dev->iop, msg, 2);
184 * i2o_block_device_lock - Locks the media of device dev
185 * @dev: I2O device which should receive the lock request
186 * @media_id: Media Identifier
188 * Lock media of device dev to prevent removal. The media identifier
189 * should be set to -1, because the spec does not support any other value.
191 * Returns 0 on success or negative error code on failure.
193 static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id)
195 struct i2o_message *msg;
197 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
201 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
203 cpu_to_le32(I2O_CMD_BLOCK_MLOCK << 24 | HOST_TID << 12 | dev->
205 msg->body[0] = cpu_to_le32(-1);
206 osm_debug("Locking...\n");
208 return i2o_msg_post_wait(dev->iop, msg, 2);
212 * i2o_block_device_unlock - Unlocks the media of device dev
213 * @dev: I2O device which should receive the unlocked request
214 * @media_id: Media Identifier
216 * Unlocks the media in device dev. The media identifier should be set to
217 * -1, because the spec does not support any other value.
219 * Returns 0 on success or negative error code on failure.
221 static int i2o_block_device_unlock(struct i2o_device *dev, u32 media_id)
223 struct i2o_message *msg;
225 msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
229 msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
231 cpu_to_le32(I2O_CMD_BLOCK_MUNLOCK << 24 | HOST_TID << 12 | dev->
233 msg->body[0] = cpu_to_le32(media_id);
234 osm_debug("Unlocking...\n");
236 return i2o_msg_post_wait(dev->iop, msg, 2);
240 * i2o_block_device_power - Power management for device dev
241 * @dev: I2O device which should receive the power management request
242 * @op: Operation to send
244 * Send a power management request to the device dev.
246 * Returns 0 on success or negative error code on failure.
248 static int i2o_block_device_power(struct i2o_block_device *dev, u8 op)
250 struct i2o_device *i2o_dev = dev->i2o_dev;
251 struct i2o_controller *c = i2o_dev->iop;
252 struct i2o_message *msg;
255 msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
259 msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0);
261 cpu_to_le32(I2O_CMD_BLOCK_POWER << 24 | HOST_TID << 12 | i2o_dev->
263 msg->body[0] = cpu_to_le32(op << 24);
264 osm_debug("Power...\n");
266 rc = i2o_msg_post_wait(c, msg, 60);
274 * i2o_block_request_alloc - Allocate an I2O block request struct
276 * Allocates an I2O block request struct and initialize the list.
278 * Returns a i2o_block_request pointer on success or negative error code
281 static inline struct i2o_block_request *i2o_block_request_alloc(void)
283 struct i2o_block_request *ireq;
285 ireq = mempool_alloc(i2o_blk_req_pool.pool, GFP_ATOMIC);
287 return ERR_PTR(-ENOMEM);
289 INIT_LIST_HEAD(&ireq->queue);
290 sg_init_table(ireq->sg_table, I2O_MAX_PHYS_SEGMENTS);
296 * i2o_block_request_free - Frees a I2O block request
297 * @ireq: I2O block request which should be freed
299 * Frees the allocated memory (give it back to the request mempool).
301 static inline void i2o_block_request_free(struct i2o_block_request *ireq)
303 mempool_free(ireq, i2o_blk_req_pool.pool);
307 * i2o_block_sglist_alloc - Allocate the SG list and map it
308 * @c: I2O controller to which the request belongs
309 * @ireq: I2O block request
310 * @mptr: message body pointer
312 * Builds the SG list and map it to be accessible by the controller.
314 * Returns 0 on failure or 1 on success.
316 static inline int i2o_block_sglist_alloc(struct i2o_controller *c,
317 struct i2o_block_request *ireq,
321 enum dma_data_direction direction;
323 ireq->dev = &c->pdev->dev;
324 nents = blk_rq_map_sg(ireq->req->q, ireq->req, ireq->sg_table);
326 if (rq_data_dir(ireq->req) == READ)
327 direction = PCI_DMA_FROMDEVICE;
329 direction = PCI_DMA_TODEVICE;
331 ireq->sg_nents = nents;
333 return i2o_dma_map_sg(c, ireq->sg_table, nents, direction, mptr);
337 * i2o_block_sglist_free - Frees the SG list
338 * @ireq: I2O block request from which the SG should be freed
340 * Frees the SG list from the I2O block request.
342 static inline void i2o_block_sglist_free(struct i2o_block_request *ireq)
344 enum dma_data_direction direction;
346 if (rq_data_dir(ireq->req) == READ)
347 direction = PCI_DMA_FROMDEVICE;
349 direction = PCI_DMA_TODEVICE;
351 dma_unmap_sg(ireq->dev, ireq->sg_table, ireq->sg_nents, direction);
355 * i2o_block_prep_req_fn - Allocates I2O block device specific struct
356 * @q: request queue for the request
357 * @req: the request to prepare
359 * Allocate the necessary i2o_block_request struct and connect it to
360 * the request. This is needed that we not lose the SG list later on.
362 * Returns BLKPREP_OK on success or BLKPREP_DEFER on failure.
364 static int i2o_block_prep_req_fn(struct request_queue *q, struct request *req)
366 struct i2o_block_device *i2o_blk_dev = q->queuedata;
367 struct i2o_block_request *ireq;
369 if (unlikely(!i2o_blk_dev)) {
370 osm_err("block device already removed\n");
374 /* connect the i2o_block_request to the request */
376 ireq = i2o_block_request_alloc();
378 osm_debug("unable to allocate i2o_block_request!\n");
379 return BLKPREP_DEFER;
382 ireq->i2o_blk_dev = i2o_blk_dev;
386 /* do not come back here */
387 req->cmd_flags |= REQ_DONTPREP;
393 * i2o_block_delayed_request_fn - delayed request queue function
394 * @work: the delayed request with the queue to start
396 * If the request queue is stopped for a disk, and there is no open
397 * request, a new event is created, which calls this function to start
398 * the queue after I2O_BLOCK_REQUEST_TIME. Otherwise the queue will never
401 static void i2o_block_delayed_request_fn(struct work_struct *work)
403 struct i2o_block_delayed_request *dreq =
404 container_of(work, struct i2o_block_delayed_request,
406 struct request_queue *q = dreq->queue;
409 spin_lock_irqsave(q->queue_lock, flags);
411 spin_unlock_irqrestore(q->queue_lock, flags);
416 * i2o_block_end_request - Post-processing of completed commands
417 * @req: request which should be completed
418 * @error: 0 for success, < 0 for error
419 * @nr_bytes: number of bytes to complete
421 * Mark the request as complete. The lock must not be held when entering.
424 static void i2o_block_end_request(struct request *req, int error,
427 struct i2o_block_request *ireq = req->special;
428 struct i2o_block_device *dev = ireq->i2o_blk_dev;
429 struct request_queue *q = req->q;
432 if (blk_end_request(req, error, nr_bytes))
434 blk_end_request_all(req, -EIO);
436 spin_lock_irqsave(q->queue_lock, flags);
439 dev->open_queue_depth--;
440 list_del(&ireq->queue);
445 spin_unlock_irqrestore(q->queue_lock, flags);
447 i2o_block_sglist_free(ireq);
448 i2o_block_request_free(ireq);
452 * i2o_block_reply - Block OSM reply handler.
453 * @c: I2O controller from which the message arrives
454 * @m: message id of reply
455 * @msg: the actual I2O message reply
457 * This function gets all the message replies.
460 static int i2o_block_reply(struct i2o_controller *c, u32 m,
461 struct i2o_message *msg)
466 req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt));
467 if (unlikely(!req)) {
468 osm_err("NULL reply received!\n");
473 * Lets see what is cooking. We stuffed the
474 * request in the context.
477 if ((le32_to_cpu(msg->body[0]) >> 24) != 0) {
478 u32 status = le32_to_cpu(msg->body[0]);
480 * Device not ready means two things. One is that the
481 * the thing went offline (but not a removal media)
483 * The second is that you have a SuperTrak 100 and the
484 * firmware got constipated. Unlike standard i2o card
485 * setups the supertrak returns an error rather than
486 * blocking for the timeout in these cases.
488 * Don't stick a supertrak100 into cache aggressive modes
491 osm_err("TID %03x error status: 0x%02x, detailed status: "
492 "0x%04x\n", (le32_to_cpu(msg->u.head[1]) >> 12 & 0xfff),
493 status >> 24, status & 0xffff);
500 i2o_block_end_request(req, error, le32_to_cpu(msg->body[1]));
505 static void i2o_block_event(struct work_struct *work)
507 struct i2o_event *evt = container_of(work, struct i2o_event, work);
508 osm_debug("event received\n");
513 * SCSI-CAM for ioctl geometry mapping
514 * Duplicated with SCSI - this should be moved into somewhere common
517 * LBA -> CHS mapping table taken from:
519 * "Incorporating the I2O Architecture into BIOS for Intel Architecture
522 * This is an I2O document that is only available to I2O members,
525 * From my understanding, this is how all the I2O cards do this
527 * Disk Size | Sectors | Heads | Cylinders
528 * ---------------+---------+-------+-------------------
529 * 1 < X <= 528M | 63 | 16 | X/(63 * 16 * 512)
530 * 528M < X <= 1G | 63 | 32 | X/(63 * 32 * 512)
531 * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512)
532 * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512)
535 #define BLOCK_SIZE_528M 1081344
536 #define BLOCK_SIZE_1G 2097152
537 #define BLOCK_SIZE_21G 4403200
538 #define BLOCK_SIZE_42G 8806400
539 #define BLOCK_SIZE_84G 17612800
541 static void i2o_block_biosparam(unsigned long capacity, unsigned short *cyls,
542 unsigned char *hds, unsigned char *secs)
544 unsigned long heads, sectors, cylinders;
546 sectors = 63L; /* Maximize sectors per track */
547 if (capacity <= BLOCK_SIZE_528M)
549 else if (capacity <= BLOCK_SIZE_1G)
551 else if (capacity <= BLOCK_SIZE_21G)
553 else if (capacity <= BLOCK_SIZE_42G)
558 cylinders = (unsigned long)capacity / (heads * sectors);
560 *cyls = (unsigned short)cylinders; /* Stuff return values */
561 *secs = (unsigned char)sectors;
562 *hds = (unsigned char)heads;
566 * i2o_block_open - Open the block device
567 * @bdev: block device being opened
568 * @mode: file open mode
570 * Power up the device, mount and lock the media. This function is called,
571 * if the block device is opened for access.
573 * Returns 0 on success or negative error code on failure.
575 static int i2o_block_open(struct block_device *bdev, fmode_t mode)
577 struct i2o_block_device *dev = bdev->bd_disk->private_data;
582 mutex_lock(&i2o_block_mutex);
583 if (dev->power > 0x1f)
584 i2o_block_device_power(dev, 0x02);
586 i2o_block_device_mount(dev->i2o_dev, -1);
588 i2o_block_device_lock(dev->i2o_dev, -1);
590 osm_debug("Ready.\n");
591 mutex_unlock(&i2o_block_mutex);
597 * i2o_block_release - Release the I2O block device
598 * @disk: gendisk device being released
599 * @mode: file open mode
601 * Unlock and unmount the media, and power down the device. Gets called if
602 * the block device is closed.
604 static void i2o_block_release(struct gendisk *disk, fmode_t mode)
606 struct i2o_block_device *dev = disk->private_data;
610 * This is to deal with the case of an application
611 * opening a device and then the device disappears while
612 * it's in use, and then the application tries to release
613 * it. ex: Unmounting a deleted RAID volume at reboot.
614 * If we send messages, it will just cause FAILs since
615 * the TID no longer exists.
620 mutex_lock(&i2o_block_mutex);
621 i2o_block_device_flush(dev->i2o_dev);
623 i2o_block_device_unlock(dev->i2o_dev, -1);
625 if (dev->flags & (1 << 3 | 1 << 4)) /* Removable */
630 i2o_block_device_power(dev, operation);
631 mutex_unlock(&i2o_block_mutex);
634 static int i2o_block_getgeo(struct block_device *bdev, struct hd_geometry *geo)
636 i2o_block_biosparam(get_capacity(bdev->bd_disk),
637 &geo->cylinders, &geo->heads, &geo->sectors);
642 * i2o_block_ioctl - Issue device specific ioctl calls.
643 * @bdev: block device being opened
644 * @mode: file open mode
645 * @cmd: ioctl command
648 * Handles ioctl request for the block device.
650 * Return 0 on success or negative error on failure.
652 static int i2o_block_ioctl(struct block_device *bdev, fmode_t mode,
653 unsigned int cmd, unsigned long arg)
655 struct gendisk *disk = bdev->bd_disk;
656 struct i2o_block_device *dev = disk->private_data;
659 /* Anyone capable of this syscall can do *real bad* things */
661 if (!capable(CAP_SYS_ADMIN))
664 mutex_lock(&i2o_block_mutex);
667 ret = put_user(dev->rcache, (int __user *)arg);
670 ret = put_user(dev->wcache, (int __user *)arg);
674 if (arg < 0 || arg > CACHE_SMARTFETCH)
682 && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK))
688 mutex_unlock(&i2o_block_mutex);
694 * i2o_block_check_events - Have we seen a media change?
695 * @disk: gendisk which should be verified
696 * @clearing: events being cleared
698 * Verifies if the media has changed.
700 * Returns 1 if the media was changed or 0 otherwise.
702 static unsigned int i2o_block_check_events(struct gendisk *disk,
703 unsigned int clearing)
705 struct i2o_block_device *p = disk->private_data;
707 if (p->media_change_flag) {
708 p->media_change_flag = 0;
709 return DISK_EVENT_MEDIA_CHANGE;
715 * i2o_block_transfer - Transfer a request to/from the I2O controller
716 * @req: the request which should be transferred
718 * This function converts the request into a I2O message. The necessary
719 * DMA buffers are allocated and after everything is setup post the message
720 * to the I2O controller. No cleanup is done by this function. It is done
721 * on the interrupt side when the reply arrives.
723 * Return 0 on success or negative error code on failure.
725 static int i2o_block_transfer(struct request *req)
727 struct i2o_block_device *dev = req->rq_disk->private_data;
728 struct i2o_controller *c;
730 struct i2o_message *msg;
732 struct i2o_block_request *ireq = req->special;
734 u32 sgl_offset = SGL_OFFSET_8;
735 u32 ctl_flags = 0x00000000;
739 if (unlikely(!dev->i2o_dev)) {
740 osm_err("transfer to removed drive\n");
745 tid = dev->i2o_dev->lct_data.tid;
746 c = dev->i2o_dev->iop;
748 msg = i2o_msg_get(c);
754 tcntxt = i2o_cntxt_list_add(c, req);
760 msg->u.s.icntxt = cpu_to_le32(i2o_block_driver.context);
761 msg->u.s.tcntxt = cpu_to_le32(tcntxt);
763 mptr = &msg->body[0];
765 if (rq_data_dir(req) == READ) {
766 cmd = I2O_CMD_BLOCK_READ << 24;
768 switch (dev->rcache) {
770 ctl_flags = 0x201F0008;
773 case CACHE_SMARTFETCH:
774 if (blk_rq_sectors(req) > 16)
775 ctl_flags = 0x201F0008;
777 ctl_flags = 0x001F0000;
784 cmd = I2O_CMD_BLOCK_WRITE << 24;
786 switch (dev->wcache) {
787 case CACHE_WRITETHROUGH:
788 ctl_flags = 0x001F0008;
790 case CACHE_WRITEBACK:
791 ctl_flags = 0x001F0010;
793 case CACHE_SMARTBACK:
794 if (blk_rq_sectors(req) > 16)
795 ctl_flags = 0x001F0004;
797 ctl_flags = 0x001F0010;
799 case CACHE_SMARTTHROUGH:
800 if (blk_rq_sectors(req) > 16)
801 ctl_flags = 0x001F0004;
803 ctl_flags = 0x001F0010;
809 #ifdef CONFIG_I2O_EXT_ADAPTEC
815 hwsec = queue_logical_block_size(req->q) >> KERNEL_SECTOR_SHIFT;
818 sgl_offset = SGL_OFFSET_12;
821 cpu_to_le32(I2O_CMD_PRIVATE << 24 | HOST_TID << 12 | tid);
823 *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC);
824 *mptr++ = cpu_to_le32(tid);
829 * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME
831 if (rq_data_dir(req) == READ) {
833 scsi_flags = 0x60a0000a;
836 scsi_flags = 0xa0a0000a;
839 *mptr++ = cpu_to_le32(scsi_flags);
841 *((u32 *) & cmd[2]) = cpu_to_be32(blk_rq_pos(req) * hwsec);
842 *((u16 *) & cmd[7]) = cpu_to_be16(blk_rq_sectors(req) * hwsec);
844 memcpy(mptr, cmd, 10);
846 *mptr++ = cpu_to_le32(blk_rq_bytes(req));
850 msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid);
851 *mptr++ = cpu_to_le32(ctl_flags);
852 *mptr++ = cpu_to_le32(blk_rq_bytes(req));
854 cpu_to_le32((u32) (blk_rq_pos(req) << KERNEL_SECTOR_SHIFT));
856 cpu_to_le32(blk_rq_pos(req) >> (32 - KERNEL_SECTOR_SHIFT));
859 if (!i2o_block_sglist_alloc(c, ireq, &mptr)) {
865 cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset);
867 list_add_tail(&ireq->queue, &dev->open_queue);
868 dev->open_queue_depth++;
870 i2o_msg_post(c, msg);
875 i2o_cntxt_list_remove(c, req);
885 * i2o_block_request_fn - request queue handling function
886 * @q: request queue from which the request could be fetched
888 * Takes the next request from the queue, transfers it and if no error
889 * occurs dequeue it from the queue. On arrival of the reply the message
890 * will be processed further. If an error occurs requeue the request.
892 static void i2o_block_request_fn(struct request_queue *q)
896 while ((req = blk_peek_request(q)) != NULL) {
897 if (req->cmd_type == REQ_TYPE_FS) {
898 struct i2o_block_delayed_request *dreq;
899 struct i2o_block_request *ireq = req->special;
900 unsigned int queue_depth;
902 queue_depth = ireq->i2o_blk_dev->open_queue_depth;
904 if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS) {
905 if (!i2o_block_transfer(req)) {
906 blk_start_request(req);
909 osm_info("transfer error\n");
915 /* stop the queue and retry later */
916 dreq = kmalloc(sizeof(*dreq), GFP_ATOMIC);
921 INIT_DELAYED_WORK(&dreq->work,
922 i2o_block_delayed_request_fn);
924 if (!queue_delayed_work(i2o_block_driver.event_queue,
926 I2O_BLOCK_RETRY_TIME))
933 blk_start_request(req);
934 __blk_end_request_all(req, -EIO);
939 /* I2O Block device operations definition */
940 static const struct block_device_operations i2o_block_fops = {
941 .owner = THIS_MODULE,
942 .open = i2o_block_open,
943 .release = i2o_block_release,
944 .ioctl = i2o_block_ioctl,
945 .compat_ioctl = i2o_block_ioctl,
946 .getgeo = i2o_block_getgeo,
947 .check_events = i2o_block_check_events,
951 * i2o_block_device_alloc - Allocate memory for a I2O Block device
953 * Allocate memory for the i2o_block_device struct, gendisk and request
954 * queue and initialize them as far as no additional information is needed.
956 * Returns a pointer to the allocated I2O Block device on success or a
957 * negative error code on failure.
959 static struct i2o_block_device *i2o_block_device_alloc(void)
961 struct i2o_block_device *dev;
963 struct request_queue *queue;
966 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
968 osm_err("Insufficient memory to allocate I2O Block disk.\n");
973 INIT_LIST_HEAD(&dev->open_queue);
974 spin_lock_init(&dev->lock);
975 dev->rcache = CACHE_PREFETCH;
976 dev->wcache = CACHE_WRITEBACK;
978 /* allocate a gendisk with 16 partitions */
981 osm_err("Insufficient memory to allocate gendisk.\n");
986 /* initialize the request queue */
987 queue = blk_init_queue(i2o_block_request_fn, &dev->lock);
989 osm_err("Insufficient memory to allocate request queue.\n");
994 blk_queue_prep_rq(queue, i2o_block_prep_req_fn);
996 gd->major = I2O_MAJOR;
998 gd->fops = &i2o_block_fops;
999 gd->private_data = dev;
1016 * i2o_block_probe - verify if dev is a I2O Block device and install it
1017 * @dev: device to verify if it is a I2O Block device
1019 * We only verify if the user_tid of the device is 0xfff and then install
1020 * the device. Otherwise it is used by some other device (e. g. RAID).
1022 * Returns 0 on success or negative error code on failure.
1024 static int i2o_block_probe(struct device *dev)
1026 struct i2o_device *i2o_dev = to_i2o_device(dev);
1027 struct i2o_controller *c = i2o_dev->iop;
1028 struct i2o_block_device *i2o_blk_dev;
1030 struct request_queue *queue;
1031 static int unit = 0;
1037 unsigned short max_sectors;
1039 #ifdef CONFIG_I2O_EXT_ADAPTEC
1044 if (c->limit_sectors)
1045 max_sectors = I2O_MAX_SECTORS_LIMITED;
1047 max_sectors = I2O_MAX_SECTORS;
1049 /* skip devices which are used by IOP */
1050 if (i2o_dev->lct_data.user_tid != 0xfff) {
1051 osm_debug("skipping used device %03x\n", i2o_dev->lct_data.tid);
1055 if (i2o_device_claim(i2o_dev)) {
1056 osm_warn("Unable to claim device. Installation aborted\n");
1061 i2o_blk_dev = i2o_block_device_alloc();
1062 if (IS_ERR(i2o_blk_dev)) {
1063 osm_err("could not alloc a new I2O block device");
1064 rc = PTR_ERR(i2o_blk_dev);
1068 i2o_blk_dev->i2o_dev = i2o_dev;
1069 dev_set_drvdata(dev, i2o_blk_dev);
1072 gd = i2o_blk_dev->gd;
1073 gd->first_minor = unit << 4;
1074 sprintf(gd->disk_name, "i2o/hd%c", 'a' + unit);
1075 gd->driverfs_dev = &i2o_dev->device;
1077 /* setup request queue */
1079 queue->queuedata = i2o_blk_dev;
1081 blk_queue_max_hw_sectors(queue, max_sectors);
1082 blk_queue_max_segments(queue, i2o_sg_tablesize(c, body_size));
1084 osm_debug("max sectors = %d\n", queue->max_sectors);
1085 osm_debug("phys segments = %d\n", queue->max_phys_segments);
1086 osm_debug("max hw segments = %d\n", queue->max_hw_segments);
1089 * Ask for the current media data. If that isn't supported
1090 * then we ask for the device capacity data
1092 if (!i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4) ||
1093 !i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4)) {
1094 blk_queue_logical_block_size(queue, le32_to_cpu(blocksize));
1096 osm_warn("unable to get blocksize of %s\n", gd->disk_name);
1098 if (!i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8) ||
1099 !i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8)) {
1100 set_capacity(gd, le64_to_cpu(size) >> KERNEL_SECTOR_SHIFT);
1102 osm_warn("could not get size of %s\n", gd->disk_name);
1104 if (!i2o_parm_field_get(i2o_dev, 0x0000, 2, &power, 2))
1105 i2o_blk_dev->power = power;
1107 i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0xffffffff);
1113 osm_info("device added (TID: %03x): %s\n", i2o_dev->lct_data.tid,
1114 i2o_blk_dev->gd->disk_name);
1119 i2o_device_claim_release(i2o_dev);
1125 /* Block OSM driver struct */
1126 static struct i2o_driver i2o_block_driver = {
1128 .event = i2o_block_event,
1129 .reply = i2o_block_reply,
1130 .classes = i2o_block_class_id,
1132 .probe = i2o_block_probe,
1133 .remove = i2o_block_remove,
1138 * i2o_block_init - Block OSM initialization function
1140 * Allocate the slab and mempool for request structs, registers i2o_block
1141 * block device and finally register the Block OSM in the I2O core.
1143 * Returns 0 on success or negative error code on failure.
1145 static int __init i2o_block_init(void)
1150 printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n");
1152 /* Allocate request mempool and slab */
1153 size = sizeof(struct i2o_block_request);
1154 i2o_blk_req_pool.slab = kmem_cache_create("i2o_block_req", size, 0,
1155 SLAB_HWCACHE_ALIGN, NULL);
1156 if (!i2o_blk_req_pool.slab) {
1157 osm_err("can't init request slab\n");
1162 i2o_blk_req_pool.pool =
1163 mempool_create_slab_pool(I2O_BLOCK_REQ_MEMPOOL_SIZE,
1164 i2o_blk_req_pool.slab);
1165 if (!i2o_blk_req_pool.pool) {
1166 osm_err("can't init request mempool\n");
1171 /* Register the block device interfaces */
1172 rc = register_blkdev(I2O_MAJOR, "i2o_block");
1174 osm_err("unable to register block device\n");
1178 osm_info("registered device at major %d\n", I2O_MAJOR);
1181 /* Register Block OSM into I2O core */
1182 rc = i2o_driver_register(&i2o_block_driver);
1184 osm_err("Could not register Block driver\n");
1185 goto unregister_blkdev;
1191 unregister_blkdev(I2O_MAJOR, "i2o_block");
1194 mempool_destroy(i2o_blk_req_pool.pool);
1197 kmem_cache_destroy(i2o_blk_req_pool.slab);
1204 * i2o_block_exit - Block OSM exit function
1206 * Unregisters Block OSM from I2O core, unregisters i2o_block block device
1207 * and frees the mempool and slab.
1209 static void __exit i2o_block_exit(void)
1211 /* Unregister I2O Block OSM from I2O core */
1212 i2o_driver_unregister(&i2o_block_driver);
1214 /* Unregister block device */
1215 unregister_blkdev(I2O_MAJOR, "i2o_block");
1217 /* Free request mempool and slab */
1218 mempool_destroy(i2o_blk_req_pool.pool);
1219 kmem_cache_destroy(i2o_blk_req_pool.slab);
1222 MODULE_AUTHOR("Red Hat");
1223 MODULE_LICENSE("GPL");
1224 MODULE_DESCRIPTION(OSM_DESCRIPTION);
1225 MODULE_VERSION(OSM_VERSION);
1227 module_init(i2o_block_init);
1228 module_exit(i2o_block_exit);