/* * Block OSM * * Copyright (C) 1999-2002 Red Hat Software * * Written by Alan Cox, Building Number Three Ltd * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * For the purpose of avoiding doubt the preferred form of the work * for making modifications shall be a standards compliant form such * gzipped tar and not one requiring a proprietary or patent encumbered * tool to unpack. * * Fixes/additions: * Steve Ralston: * Multiple device handling error fixes, * Added a queue depth. * Alan Cox: * FC920 has an rmw bug. Dont or in the end marker. * Removed queue walk, fixed for 64bitness. * Rewrote much of the code over time * Added indirect block lists * Handle 64K limits on many controllers * Don't use indirects on the Promise (breaks) * Heavily chop down the queue depths * Deepak Saxena: * Independent queues per IOP * Support for dynamic device creation/deletion * Code cleanup * Support for larger I/Os through merge* functions * (taken from DAC960 driver) * Boji T Kannanthanam: * Set the I2O Block devices to be detected in increasing * order of TIDs during boot. * Search and set the I2O block device that we boot off * from as the first device to be claimed (as /dev/i2o/hda) * Properly attach/detach I2O gendisk structure from the * system gendisk list. The I2O block devices now appear in * /proc/partitions. * Markus Lidel : * Minor bugfixes for 2.6. */ #include #include #include #include #include #include #include #include #include #include "i2o_block.h" #define OSM_NAME "block-osm" #define OSM_VERSION "1.325" #define OSM_DESCRIPTION "I2O Block Device OSM" static DEFINE_MUTEX(i2o_block_mutex); static struct i2o_driver i2o_block_driver; /* global Block OSM request mempool */ static struct i2o_block_mempool i2o_blk_req_pool; /* Block OSM class handling definition */ static struct i2o_class_id i2o_block_class_id[] = { {I2O_CLASS_RANDOM_BLOCK_STORAGE}, {I2O_CLASS_END} }; /** * i2o_block_device_free - free the memory of the I2O Block device * @dev: I2O Block device, which should be cleaned up * * Frees the request queue, gendisk and the i2o_block_device structure. */ static void i2o_block_device_free(struct i2o_block_device *dev) { blk_cleanup_queue(dev->gd->queue); put_disk(dev->gd); kfree(dev); }; /** * i2o_block_remove - remove the I2O Block device from the system again * @dev: I2O Block device which should be removed * * Remove gendisk from system and free all allocated memory. * * Always returns 0. */ static int i2o_block_remove(struct device *dev) { struct i2o_device *i2o_dev = to_i2o_device(dev); struct i2o_block_device *i2o_blk_dev = dev_get_drvdata(dev); osm_info("device removed (TID: %03x): %s\n", i2o_dev->lct_data.tid, i2o_blk_dev->gd->disk_name); i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0); del_gendisk(i2o_blk_dev->gd); dev_set_drvdata(dev, NULL); i2o_device_claim_release(i2o_dev); i2o_block_device_free(i2o_blk_dev); return 0; }; /** * i2o_block_device flush - Flush all dirty data of I2O device dev * @dev: I2O device which should be flushed * * Flushes all dirty data on device dev. * * Returns 0 on success or negative error code on failure. */ static int i2o_block_device_flush(struct i2o_device *dev) { struct i2o_message *msg; msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); if (IS_ERR(msg)) return PTR_ERR(msg); msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); msg->u.head[1] = cpu_to_le32(I2O_CMD_BLOCK_CFLUSH << 24 | HOST_TID << 12 | dev-> lct_data.tid); msg->body[0] = cpu_to_le32(60 << 16); osm_debug("Flushing...\n"); return i2o_msg_post_wait(dev->iop, msg, 60); }; /** * i2o_block_device_mount - Mount (load) the media of device dev * @dev: I2O device which should receive the mount request * @media_id: Media Identifier * * Load a media into drive. Identifier should be set to -1, because the * spec does not support any other value. * * Returns 0 on success or negative error code on failure. */ static int i2o_block_device_mount(struct i2o_device *dev, u32 media_id) { struct i2o_message *msg; msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); if (IS_ERR(msg)) return PTR_ERR(msg); msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); msg->u.head[1] = cpu_to_le32(I2O_CMD_BLOCK_MMOUNT << 24 | HOST_TID << 12 | dev-> lct_data.tid); msg->body[0] = cpu_to_le32(-1); msg->body[1] = cpu_to_le32(0x00000000); osm_debug("Mounting...\n"); return i2o_msg_post_wait(dev->iop, msg, 2); }; /** * i2o_block_device_lock - Locks the media of device dev * @dev: I2O device which should receive the lock request * @media_id: Media Identifier * * Lock media of device dev to prevent removal. The media identifier * should be set to -1, because the spec does not support any other value. * * Returns 0 on success or negative error code on failure. */ static int i2o_block_device_lock(struct i2o_device *dev, u32 media_id) { struct i2o_message *msg; msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); if (IS_ERR(msg)) return PTR_ERR(msg); msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); msg->u.head[1] = cpu_to_le32(I2O_CMD_BLOCK_MLOCK << 24 | HOST_TID << 12 | dev-> lct_data.tid); msg->body[0] = cpu_to_le32(-1); osm_debug("Locking...\n"); return i2o_msg_post_wait(dev->iop, msg, 2); }; /** * i2o_block_device_unlock - Unlocks the media of device dev * @dev: I2O device which should receive the unlocked request * @media_id: Media Identifier * * Unlocks the media in device dev. The media identifier should be set to * -1, because the spec does not support any other value. * * Returns 0 on success or negative error code on failure. */ static int i2o_block_device_unlock(struct i2o_device *dev, u32 media_id) { struct i2o_message *msg; msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET); if (IS_ERR(msg)) return PTR_ERR(msg); msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0); msg->u.head[1] = cpu_to_le32(I2O_CMD_BLOCK_MUNLOCK << 24 | HOST_TID << 12 | dev-> lct_data.tid); msg->body[0] = cpu_to_le32(media_id); osm_debug("Unlocking...\n"); return i2o_msg_post_wait(dev->iop, msg, 2); }; /** * i2o_block_device_power - Power management for device dev * @dev: I2O device which should receive the power management request * @op: Operation to send * * Send a power management request to the device dev. * * Returns 0 on success or negative error code on failure. */ static int i2o_block_device_power(struct i2o_block_device *dev, u8 op) { struct i2o_device *i2o_dev = dev->i2o_dev; struct i2o_controller *c = i2o_dev->iop; struct i2o_message *msg; int rc; msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET); if (IS_ERR(msg)) return PTR_ERR(msg); msg->u.head[0] = cpu_to_le32(FOUR_WORD_MSG_SIZE | SGL_OFFSET_0); msg->u.head[1] = cpu_to_le32(I2O_CMD_BLOCK_POWER << 24 | HOST_TID << 12 | i2o_dev-> lct_data.tid); msg->body[0] = cpu_to_le32(op << 24); osm_debug("Power...\n"); rc = i2o_msg_post_wait(c, msg, 60); if (!rc) dev->power = op; return rc; }; /** * i2o_block_request_alloc - Allocate an I2O block request struct * * Allocates an I2O block request struct and initialize the list. * * Returns a i2o_block_request pointer on success or negative error code * on failure. */ static inline struct i2o_block_request *i2o_block_request_alloc(void) { struct i2o_block_request *ireq; ireq = mempool_alloc(i2o_blk_req_pool.pool, GFP_ATOMIC); if (!ireq) return ERR_PTR(-ENOMEM); INIT_LIST_HEAD(&ireq->queue); sg_init_table(ireq->sg_table, I2O_MAX_PHYS_SEGMENTS); return ireq; }; /** * i2o_block_request_free - Frees a I2O block request * @ireq: I2O block request which should be freed * * Frees the allocated memory (give it back to the request mempool). */ static inline void i2o_block_request_free(struct i2o_block_request *ireq) { mempool_free(ireq, i2o_blk_req_pool.pool); }; /** * i2o_block_sglist_alloc - Allocate the SG list and map it * @c: I2O controller to which the request belongs * @ireq: I2O block request * @mptr: message body pointer * * Builds the SG list and map it to be accessible by the controller. * * Returns 0 on failure or 1 on success. */ static inline int i2o_block_sglist_alloc(struct i2o_controller *c, struct i2o_block_request *ireq, u32 ** mptr) { int nents; enum dma_data_direction direction; ireq->dev = &c->pdev->dev; nents = blk_rq_map_sg(ireq->req->q, ireq->req, ireq->sg_table); if (rq_data_dir(ireq->req) == READ) direction = PCI_DMA_FROMDEVICE; else direction = PCI_DMA_TODEVICE; ireq->sg_nents = nents; return i2o_dma_map_sg(c, ireq->sg_table, nents, direction, mptr); }; /** * i2o_block_sglist_free - Frees the SG list * @ireq: I2O block request from which the SG should be freed * * Frees the SG list from the I2O block request. */ static inline void i2o_block_sglist_free(struct i2o_block_request *ireq) { enum dma_data_direction direction; if (rq_data_dir(ireq->req) == READ) direction = PCI_DMA_FROMDEVICE; else direction = PCI_DMA_TODEVICE; dma_unmap_sg(ireq->dev, ireq->sg_table, ireq->sg_nents, direction); }; /** * i2o_block_prep_req_fn - Allocates I2O block device specific struct * @q: request queue for the request * @req: the request to prepare * * Allocate the necessary i2o_block_request struct and connect it to * the request. This is needed that we not lose the SG list later on. * * Returns BLKPREP_OK on success or BLKPREP_DEFER on failure. */ static int i2o_block_prep_req_fn(struct request_queue *q, struct request *req) { struct i2o_block_device *i2o_blk_dev = q->queuedata; struct i2o_block_request *ireq; if (unlikely(!i2o_blk_dev)) { osm_err("block device already removed\n"); return BLKPREP_KILL; } /* connect the i2o_block_request to the request */ if (!req->special) { ireq = i2o_block_request_alloc(); if (IS_ERR(ireq)) { osm_debug("unable to allocate i2o_block_request!\n"); return BLKPREP_DEFER; } ireq->i2o_blk_dev = i2o_blk_dev; req->special = ireq; ireq->req = req; } /* do not come back here */ req->cmd_flags |= REQ_DONTPREP; return BLKPREP_OK; }; /** * i2o_block_delayed_request_fn - delayed request queue function * @work: the delayed request with the queue to start * * If the request queue is stopped for a disk, and there is no open * request, a new event is created, which calls this function to start * the queue after I2O_BLOCK_REQUEST_TIME. Otherwise the queue will never * be started again. */ static void i2o_block_delayed_request_fn(struct work_struct *work) { struct i2o_block_delayed_request *dreq = container_of(work, struct i2o_block_delayed_request, work.work); struct request_queue *q = dreq->queue; unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); blk_start_queue(q); spin_unlock_irqrestore(q->queue_lock, flags); kfree(dreq); }; /** * i2o_block_end_request - Post-processing of completed commands * @req: request which should be completed * @error: 0 for success, < 0 for error * @nr_bytes: number of bytes to complete * * Mark the request as complete. The lock must not be held when entering. * */ static void i2o_block_end_request(struct request *req, int error, int nr_bytes) { struct i2o_block_request *ireq = req->special; struct i2o_block_device *dev = ireq->i2o_blk_dev; struct request_queue *q = req->q; unsigned long flags; if (blk_end_request(req, error, nr_bytes)) if (error) blk_end_request_all(req, -EIO); spin_lock_irqsave(q->queue_lock, flags); if (likely(dev)) { dev->open_queue_depth--; list_del(&ireq->queue); } blk_start_queue(q); spin_unlock_irqrestore(q->queue_lock, flags); i2o_block_sglist_free(ireq); i2o_block_request_free(ireq); }; /** * i2o_block_reply - Block OSM reply handler. * @c: I2O controller from which the message arrives * @m: message id of reply * @msg: the actual I2O message reply * * This function gets all the message replies. * */ static int i2o_block_reply(struct i2o_controller *c, u32 m, struct i2o_message *msg) { struct request *req; int error = 0; req = i2o_cntxt_list_get(c, le32_to_cpu(msg->u.s.tcntxt)); if (unlikely(!req)) { osm_err("NULL reply received!\n"); return -1; } /* * Lets see what is cooking. We stuffed the * request in the context. */ if ((le32_to_cpu(msg->body[0]) >> 24) != 0) { u32 status = le32_to_cpu(msg->body[0]); /* * Device not ready means two things. One is that the * the thing went offline (but not a removal media) * * The second is that you have a SuperTrak 100 and the * firmware got constipated. Unlike standard i2o card * setups the supertrak returns an error rather than * blocking for the timeout in these cases. * * Don't stick a supertrak100 into cache aggressive modes */ osm_err("TID %03x error status: 0x%02x, detailed status: " "0x%04x\n", (le32_to_cpu(msg->u.head[1]) >> 12 & 0xfff), status >> 24, status & 0xffff); req->errors++; error = -EIO; } i2o_block_end_request(req, error, le32_to_cpu(msg->body[1])); return 1; }; static void i2o_block_event(struct work_struct *work) { struct i2o_event *evt = container_of(work, struct i2o_event, work); osm_debug("event received\n"); kfree(evt); }; /* * SCSI-CAM for ioctl geometry mapping * Duplicated with SCSI - this should be moved into somewhere common * perhaps genhd ? * * LBA -> CHS mapping table taken from: * * "Incorporating the I2O Architecture into BIOS for Intel Architecture * Platforms" * * This is an I2O document that is only available to I2O members, * not developers. * * From my understanding, this is how all the I2O cards do this * * Disk Size | Sectors | Heads | Cylinders * ---------------+---------+-------+------------------- * 1 < X <= 528M | 63 | 16 | X/(63 * 16 * 512) * 528M < X <= 1G | 63 | 32 | X/(63 * 32 * 512) * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) * 1 < X <528M | 63 | 16 | X/(63 * 16 * 512) * */ #define BLOCK_SIZE_528M 1081344 #define BLOCK_SIZE_1G 2097152 #define BLOCK_SIZE_21G 4403200 #define BLOCK_SIZE_42G 8806400 #define BLOCK_SIZE_84G 17612800 static void i2o_block_biosparam(unsigned long capacity, unsigned short *cyls, unsigned char *hds, unsigned char *secs) { unsigned long heads, sectors, cylinders; sectors = 63L; /* Maximize sectors per track */ if (capacity <= BLOCK_SIZE_528M) heads = 16; else if (capacity <= BLOCK_SIZE_1G) heads = 32; else if (capacity <= BLOCK_SIZE_21G) heads = 64; else if (capacity <= BLOCK_SIZE_42G) heads = 128; else heads = 255; cylinders = (unsigned long)capacity / (heads * sectors); *cyls = (unsigned short)cylinders; /* Stuff return values */ *secs = (unsigned char)sectors; *hds = (unsigned char)heads; } /** * i2o_block_open - Open the block device * @bdev: block device being opened * @mode: file open mode * * Power up the device, mount and lock the media. This function is called, * if the block device is opened for access. * * Returns 0 on success or negative error code on failure. */ static int i2o_block_open(struct block_device *bdev, fmode_t mode) { struct i2o_block_device *dev = bdev->bd_disk->private_data; if (!dev->i2o_dev) return -ENODEV; mutex_lock(&i2o_block_mutex); if (dev->power > 0x1f) i2o_block_device_power(dev, 0x02); i2o_block_device_mount(dev->i2o_dev, -1); i2o_block_device_lock(dev->i2o_dev, -1); osm_debug("Ready.\n"); mutex_unlock(&i2o_block_mutex); return 0; }; /** * i2o_block_release - Release the I2O block device * @disk: gendisk device being released * @mode: file open mode * * Unlock and unmount the media, and power down the device. Gets called if * the block device is closed. * * Returns 0 on success or negative error code on failure. */ static int i2o_block_release(struct gendisk *disk, fmode_t mode) { struct i2o_block_device *dev = disk->private_data; u8 operation; /* * This is to deail with the case of an application * opening a device and then the device disappears while * it's in use, and then the application tries to release * it. ex: Unmounting a deleted RAID volume at reboot. * If we send messages, it will just cause FAILs since * the TID no longer exists. */ if (!dev->i2o_dev) return 0; mutex_lock(&i2o_block_mutex); i2o_block_device_flush(dev->i2o_dev); i2o_block_device_unlock(dev->i2o_dev, -1); if (dev->flags & (1 << 3 | 1 << 4)) /* Removable */ operation = 0x21; else operation = 0x24; i2o_block_device_power(dev, operation); mutex_unlock(&i2o_block_mutex); return 0; } static int i2o_block_getgeo(struct block_device *bdev, struct hd_geometry *geo) { i2o_block_biosparam(get_capacity(bdev->bd_disk), &geo->cylinders, &geo->heads, &geo->sectors); return 0; } /** * i2o_block_ioctl - Issue device specific ioctl calls. * @bdev: block device being opened * @mode: file open mode * @cmd: ioctl command * @arg: arg * * Handles ioctl request for the block device. * * Return 0 on success or negative error on failure. */ static int i2o_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) { struct gendisk *disk = bdev->bd_disk; struct i2o_block_device *dev = disk->private_data; int ret = -ENOTTY; /* Anyone capable of this syscall can do *real bad* things */ if (!capable(CAP_SYS_ADMIN)) return -EPERM; mutex_lock(&i2o_block_mutex); switch (cmd) { case BLKI2OGRSTRAT: ret = put_user(dev->rcache, (int __user *)arg); break; case BLKI2OGWSTRAT: ret = put_user(dev->wcache, (int __user *)arg); break; case BLKI2OSRSTRAT: ret = -EINVAL; if (arg < 0 || arg > CACHE_SMARTFETCH) break; dev->rcache = arg; ret = 0; break; case BLKI2OSWSTRAT: ret = -EINVAL; if (arg != 0 && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK)) break; dev->wcache = arg; ret = 0; break; } mutex_unlock(&i2o_block_mutex); return ret; }; /** * i2o_block_check_events - Have we seen a media change? * @disk: gendisk which should be verified * @clearing: events being cleared * * Verifies if the media has changed. * * Returns 1 if the media was changed or 0 otherwise. */ static unsigned int i2o_block_check_events(struct gendisk *disk, unsigned int clearing) { struct i2o_block_device *p = disk->private_data; if (p->media_change_flag) { p->media_change_flag = 0; return DISK_EVENT_MEDIA_CHANGE; } return 0; } /** * i2o_block_transfer - Transfer a request to/from the I2O controller * @req: the request which should be transferred * * This function converts the request into a I2O message. The necessary * DMA buffers are allocated and after everything is setup post the message * to the I2O controller. No cleanup is done by this function. It is done * on the interrupt side when the reply arrives. * * Return 0 on success or negative error code on failure. */ static int i2o_block_transfer(struct request *req) { struct i2o_block_device *dev = req->rq_disk->private_data; struct i2o_controller *c; u32 tid; struct i2o_message *msg; u32 *mptr; struct i2o_block_request *ireq = req->special; u32 tcntxt; u32 sgl_offset = SGL_OFFSET_8; u32 ctl_flags = 0x00000000; int rc; u32 cmd; if (unlikely(!dev->i2o_dev)) { osm_err("transfer to removed drive\n"); rc = -ENODEV; goto exit; } tid = dev->i2o_dev->lct_data.tid; c = dev->i2o_dev->iop; msg = i2o_msg_get(c); if (IS_ERR(msg)) { rc = PTR_ERR(msg); goto exit; } tcntxt = i2o_cntxt_list_add(c, req); if (!tcntxt) { rc = -ENOMEM; goto nop_msg; } msg->u.s.icntxt = cpu_to_le32(i2o_block_driver.context); msg->u.s.tcntxt = cpu_to_le32(tcntxt); mptr = &msg->body[0]; if (rq_data_dir(req) == READ) { cmd = I2O_CMD_BLOCK_READ << 24; switch (dev->rcache) { case CACHE_PREFETCH: ctl_flags = 0x201F0008; break; case CACHE_SMARTFETCH: if (blk_rq_sectors(req) > 16) ctl_flags = 0x201F0008; else ctl_flags = 0x001F0000; break; default: break; } } else { cmd = I2O_CMD_BLOCK_WRITE << 24; switch (dev->wcache) { case CACHE_WRITETHROUGH: ctl_flags = 0x001F0008; break; case CACHE_WRITEBACK: ctl_flags = 0x001F0010; break; case CACHE_SMARTBACK: if (blk_rq_sectors(req) > 16) ctl_flags = 0x001F0004; else ctl_flags = 0x001F0010; break; case CACHE_SMARTTHROUGH: if (blk_rq_sectors(req) > 16) ctl_flags = 0x001F0004; else ctl_flags = 0x001F0010; default: break; } } #ifdef CONFIG_I2O_EXT_ADAPTEC if (c->adaptec) { u8 cmd[10]; u32 scsi_flags; u16 hwsec; hwsec = queue_logical_block_size(req->q) >> KERNEL_SECTOR_SHIFT; memset(cmd, 0, 10); sgl_offset = SGL_OFFSET_12; msg->u.head[1] = cpu_to_le32(I2O_CMD_PRIVATE << 24 | HOST_TID << 12 | tid); *mptr++ = cpu_to_le32(I2O_VENDOR_DPT << 16 | I2O_CMD_SCSI_EXEC); *mptr++ = cpu_to_le32(tid); /* * ENABLE_DISCONNECT * SIMPLE_TAG * RETURN_SENSE_DATA_IN_REPLY_MESSAGE_FRAME */ if (rq_data_dir(req) == READ) { cmd[0] = READ_10; scsi_flags = 0x60a0000a; } else { cmd[0] = WRITE_10; scsi_flags = 0xa0a0000a; } *mptr++ = cpu_to_le32(scsi_flags); *((u32 *) & cmd[2]) = cpu_to_be32(blk_rq_pos(req) * hwsec); *((u16 *) & cmd[7]) = cpu_to_be16(blk_rq_sectors(req) * hwsec); memcpy(mptr, cmd, 10); mptr += 4; *mptr++ = cpu_to_le32(blk_rq_bytes(req)); } else #endif { msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid); *mptr++ = cpu_to_le32(ctl_flags); *mptr++ = cpu_to_le32(blk_rq_bytes(req)); *mptr++ = cpu_to_le32((u32) (blk_rq_pos(req) << KERNEL_SECTOR_SHIFT)); *mptr++ = cpu_to_le32(blk_rq_pos(req) >> (32 - KERNEL_SECTOR_SHIFT)); } if (!i2o_block_sglist_alloc(c, ireq, &mptr)) { rc = -ENOMEM; goto context_remove; } msg->u.head[0] = cpu_to_le32(I2O_MESSAGE_SIZE(mptr - &msg->u.head[0]) | sgl_offset); list_add_tail(&ireq->queue, &dev->open_queue); dev->open_queue_depth++; i2o_msg_post(c, msg); return 0; context_remove: i2o_cntxt_list_remove(c, req); nop_msg: i2o_msg_nop(c, msg); exit: return rc; }; /** * i2o_block_request_fn - request queue handling function * @q: request queue from which the request could be fetched * * Takes the next request from the queue, transfers it and if no error * occurs dequeue it from the queue. On arrival of the reply the message * will be processed further. If an error occurs requeue the request. */ static void i2o_block_request_fn(struct request_queue *q) { struct request *req; while ((req = blk_peek_request(q)) != NULL) { if (req->cmd_type == REQ_TYPE_FS) { struct i2o_block_delayed_request *dreq; struct i2o_block_request *ireq = req->special; unsigned int queue_depth; queue_depth = ireq->i2o_blk_dev->open_queue_depth; if (queue_depth < I2O_BLOCK_MAX_OPEN_REQUESTS) { if (!i2o_block_transfer(req)) { blk_start_request(req); continue; } else osm_info("transfer error\n"); } if (queue_depth) break; /* stop the queue and retry later */ dreq = kmalloc(sizeof(*dreq), GFP_ATOMIC); if (!dreq) continue; dreq->queue = q; INIT_DELAYED_WORK(&dreq->work, i2o_block_delayed_request_fn); if (!queue_delayed_work(i2o_block_driver.event_queue, &dreq->work, I2O_BLOCK_RETRY_TIME)) kfree(dreq); else { blk_stop_queue(q); break; } } else { blk_start_request(req); __blk_end_request_all(req, -EIO); } } }; /* I2O Block device operations definition */ static const struct block_device_operations i2o_block_fops = { .owner = THIS_MODULE, .open = i2o_block_open, .release = i2o_block_release, .ioctl = i2o_block_ioctl, .compat_ioctl = i2o_block_ioctl, .getgeo = i2o_block_getgeo, .check_events = i2o_block_check_events, }; /** * i2o_block_device_alloc - Allocate memory for a I2O Block device * * Allocate memory for the i2o_block_device struct, gendisk and request * queue and initialize them as far as no additional information is needed. * * Returns a pointer to the allocated I2O Block device on success or a * negative error code on failure. */ static struct i2o_block_device *i2o_block_device_alloc(void) { struct i2o_block_device *dev; struct gendisk *gd; struct request_queue *queue; int rc; dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) { osm_err("Insufficient memory to allocate I2O Block disk.\n"); rc = -ENOMEM; goto exit; } INIT_LIST_HEAD(&dev->open_queue); spin_lock_init(&dev->lock); dev->rcache = CACHE_PREFETCH; dev->wcache = CACHE_WRITEBACK; /* allocate a gendisk with 16 partitions */ gd = alloc_disk(16); if (!gd) { osm_err("Insufficient memory to allocate gendisk.\n"); rc = -ENOMEM; goto cleanup_dev; } /* initialize the request queue */ queue = blk_init_queue(i2o_block_request_fn, &dev->lock); if (!queue) { osm_err("Insufficient memory to allocate request queue.\n"); rc = -ENOMEM; goto cleanup_queue; } blk_queue_prep_rq(queue, i2o_block_prep_req_fn); gd->major = I2O_MAJOR; gd->queue = queue; gd->fops = &i2o_block_fops; gd->private_data = dev; dev->gd = gd; return dev; cleanup_queue: put_disk(gd); cleanup_dev: kfree(dev); exit: return ERR_PTR(rc); }; /** * i2o_block_probe - verify if dev is a I2O Block device and install it * @dev: device to verify if it is a I2O Block device * * We only verify if the user_tid of the device is 0xfff and then install * the device. Otherwise it is used by some other device (e. g. RAID). * * Returns 0 on success or negative error code on failure. */ static int i2o_block_probe(struct device *dev) { struct i2o_device *i2o_dev = to_i2o_device(dev); struct i2o_controller *c = i2o_dev->iop; struct i2o_block_device *i2o_blk_dev; struct gendisk *gd; struct request_queue *queue; static int unit = 0; int rc; u64 size; u32 blocksize; u16 body_size = 4; u16 power; unsigned short max_sectors; #ifdef CONFIG_I2O_EXT_ADAPTEC if (c->adaptec) body_size = 8; #endif if (c->limit_sectors) max_sectors = I2O_MAX_SECTORS_LIMITED; else max_sectors = I2O_MAX_SECTORS; /* skip devices which are used by IOP */ if (i2o_dev->lct_data.user_tid != 0xfff) { osm_debug("skipping used device %03x\n", i2o_dev->lct_data.tid); return -ENODEV; } if (i2o_device_claim(i2o_dev)) { osm_warn("Unable to claim device. Installation aborted\n"); rc = -EFAULT; goto exit; } i2o_blk_dev = i2o_block_device_alloc(); if (IS_ERR(i2o_blk_dev)) { osm_err("could not alloc a new I2O block device"); rc = PTR_ERR(i2o_blk_dev); goto claim_release; } i2o_blk_dev->i2o_dev = i2o_dev; dev_set_drvdata(dev, i2o_blk_dev); /* setup gendisk */ gd = i2o_blk_dev->gd; gd->first_minor = unit << 4; sprintf(gd->disk_name, "i2o/hd%c", 'a' + unit); gd->driverfs_dev = &i2o_dev->device; /* setup request queue */ queue = gd->queue; queue->queuedata = i2o_blk_dev; blk_queue_max_hw_sectors(queue, max_sectors); blk_queue_max_segments(queue, i2o_sg_tablesize(c, body_size)); osm_debug("max sectors = %d\n", queue->max_sectors); osm_debug("phys segments = %d\n", queue->max_phys_segments); osm_debug("max hw segments = %d\n", queue->max_hw_segments); /* * Ask for the current media data. If that isn't supported * then we ask for the device capacity data */ if (!i2o_parm_field_get(i2o_dev, 0x0004, 1, &blocksize, 4) || !i2o_parm_field_get(i2o_dev, 0x0000, 3, &blocksize, 4)) { blk_queue_logical_block_size(queue, le32_to_cpu(blocksize)); } else osm_warn("unable to get blocksize of %s\n", gd->disk_name); if (!i2o_parm_field_get(i2o_dev, 0x0004, 0, &size, 8) || !i2o_parm_field_get(i2o_dev, 0x0000, 4, &size, 8)) { set_capacity(gd, le64_to_cpu(size) >> KERNEL_SECTOR_SHIFT); } else osm_warn("could not get size of %s\n", gd->disk_name); if (!i2o_parm_field_get(i2o_dev, 0x0000, 2, &power, 2)) i2o_blk_dev->power = power; i2o_event_register(i2o_dev, &i2o_block_driver, 0, 0xffffffff); add_disk(gd); unit++; osm_info("device added (TID: %03x): %s\n", i2o_dev->lct_data.tid, i2o_blk_dev->gd->disk_name); return 0; claim_release: i2o_device_claim_release(i2o_dev); exit: return rc; }; /* Block OSM driver struct */ static struct i2o_driver i2o_block_driver = { .name = OSM_NAME, .event = i2o_block_event, .reply = i2o_block_reply, .classes = i2o_block_class_id, .driver = { .probe = i2o_block_probe, .remove = i2o_block_remove, }, }; /** * i2o_block_init - Block OSM initialization function * * Allocate the slab and mempool for request structs, registers i2o_block * block device and finally register the Block OSM in the I2O core. * * Returns 0 on success or negative error code on failure. */ static int __init i2o_block_init(void) { int rc; int size; printk(KERN_INFO OSM_DESCRIPTION " v" OSM_VERSION "\n"); /* Allocate request mempool and slab */ size = sizeof(struct i2o_block_request); i2o_blk_req_pool.slab = kmem_cache_create("i2o_block_req", size, 0, SLAB_HWCACHE_ALIGN, NULL); if (!i2o_blk_req_pool.slab) { osm_err("can't init request slab\n"); rc = -ENOMEM; goto exit; } i2o_blk_req_pool.pool = mempool_create_slab_pool(I2O_BLOCK_REQ_MEMPOOL_SIZE, i2o_blk_req_pool.slab); if (!i2o_blk_req_pool.pool) { osm_err("can't init request mempool\n"); rc = -ENOMEM; goto free_slab; } /* Register the block device interfaces */ rc = register_blkdev(I2O_MAJOR, "i2o_block"); if (rc) { osm_err("unable to register block device\n"); goto free_mempool; } #ifdef MODULE osm_info("registered device at major %d\n", I2O_MAJOR); #endif /* Register Block OSM into I2O core */ rc = i2o_driver_register(&i2o_block_driver); if (rc) { osm_err("Could not register Block driver\n"); goto unregister_blkdev; } return 0; unregister_blkdev: unregister_blkdev(I2O_MAJOR, "i2o_block"); free_mempool: mempool_destroy(i2o_blk_req_pool.pool); free_slab: kmem_cache_destroy(i2o_blk_req_pool.slab); exit: return rc; }; /** * i2o_block_exit - Block OSM exit function * * Unregisters Block OSM from I2O core, unregisters i2o_block block device * and frees the mempool and slab. */ static void __exit i2o_block_exit(void) { /* Unregister I2O Block OSM from I2O core */ i2o_driver_unregister(&i2o_block_driver); /* Unregister block device */ unregister_blkdev(I2O_MAJOR, "i2o_block"); /* Free request mempool and slab */ mempool_destroy(i2o_blk_req_pool.pool); kmem_cache_destroy(i2o_blk_req_pool.slab); }; MODULE_AUTHOR("Red Hat"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION(OSM_DESCRIPTION); MODULE_VERSION(OSM_VERSION); module_init(i2o_block_init); module_exit(i2o_block_exit);