diff options
Diffstat (limited to 'drivers/message/i2o/i2o_block.c')
| -rw-r--r-- | drivers/message/i2o/i2o_block.c | 1219 |
1 files changed, 1219 insertions, 0 deletions
diff --git a/drivers/message/i2o/i2o_block.c b/drivers/message/i2o/i2o_block.c new file mode 100644 index 0000000..a443e13 --- /dev/null +++ b/drivers/message/i2o/i2o_block.c @@ -0,0 +1,1219 @@ +/* + * 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 <Markus.Lidel@shadowconnect.com>: + * Minor bugfixes for 2.6. + */ + +#include <linux/module.h> +#include <linux/i2o.h> + +#include <linux/mempool.h> + +#include <linux/genhd.h> +#include <linux/blkdev.h> +#include <linux/hdreg.h> + +#include <scsi/scsi.h> + +#include "i2o_block.h" + +#define OSM_NAME "block-osm" +#define OSM_VERSION "1.325" +#define OSM_DESCRIPTION "I2O Block Device OSM" + +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 accessable 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)) { + int leftover = (req->hard_nr_sectors << KERNEL_SECTOR_SHIFT); + + if (blk_pc_request(req)) + leftover = req->data_len; + + if (error) + blk_end_request(req, -EIO, leftover); + } + + 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; + + 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"); + + 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 dissapears 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; + + 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); + + 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; + + /* Anyone capable of this syscall can do *real bad* things */ + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + switch (cmd) { + case BLKI2OGRSTRAT: + return put_user(dev->rcache, (int __user *)arg); + case BLKI2OGWSTRAT: + return put_user(dev->wcache, (int __user *)arg); + case BLKI2OSRSTRAT: + if (arg < 0 || arg > CACHE_SMARTFETCH) + return -EINVAL; + dev->rcache = arg; + break; + case BLKI2OSWSTRAT: + if (arg != 0 + && (arg < CACHE_WRITETHROUGH || arg > CACHE_SMARTBACK)) + return -EINVAL; + dev->wcache = arg; + break; + } + return -ENOTTY; +}; + +/** + * i2o_block_media_changed - Have we seen a media change? + * @disk: gendisk which should be verified + * + * Verifies if the media has changed. + * + * Returns 1 if the media was changed or 0 otherwise. + */ +static int i2o_block_media_changed(struct gendisk *disk) +{ + struct i2o_block_device *p = disk->private_data; + + if (p->media_change_flag) { + p->media_change_flag = 0; + return 1; + } + return 0; +} + +/** + * i2o_block_transfer - Transfer a request to/from the I2O controller + * @req: the request which should be transfered + * + * 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 = dev->i2o_dev->lct_data.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; + } + + 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 (req->nr_sectors > 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 (req->nr_sectors > 16) + ctl_flags = 0x001F0004; + else + ctl_flags = 0x001F0010; + break; + case CACHE_SMARTTHROUGH: + if (req->nr_sectors > 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 = queue_hardsect_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(req->sector * hwsec); + *((u16 *) & cmd[7]) = cpu_to_be16(req->nr_sectors * hwsec); + + memcpy(mptr, cmd, 10); + mptr += 4; + *mptr++ = cpu_to_le32(req->nr_sectors << KERNEL_SECTOR_SHIFT); + } else +#endif + { + msg->u.head[1] = cpu_to_le32(cmd | HOST_TID << 12 | tid); + *mptr++ = cpu_to_le32(ctl_flags); + *mptr++ = cpu_to_le32(req->nr_sectors << KERNEL_SECTOR_SHIFT); + *mptr++ = + cpu_to_le32((u32) (req->sector << KERNEL_SECTOR_SHIFT)); + *mptr++ = + cpu_to_le32(req->sector >> (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 (!blk_queue_plugged(q)) { + req = elv_next_request(q); + if (!req) + break; + + if (blk_fs_request(req)) { + 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)) { + blkdev_dequeue_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 + end_request(req, 0); + } +}; + +/* I2O Block device operations definition */ +static struct block_device_operations i2o_block_fops = { + .owner = THIS_MODULE, + .open = i2o_block_open, + .release = i2o_block_release, + .locked_ioctl = i2o_block_ioctl, + .getgeo = i2o_block_getgeo, + .media_changed = i2o_block_media_changed +}; + +/** + * 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 succes 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_phys_segments(queue, I2O_MAX_PHYS_SEGMENTS); + blk_queue_max_sectors(queue, max_sectors); + blk_queue_max_hw_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_hardsect_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); |
