104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
/*
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* Block OSM structures/API
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*
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* Copyright (C) 1999-2002 Red Hat Software
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*
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* Written by Alan Cox, Building Number Three Ltd
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* For the purpose of avoiding doubt the preferred form of the work
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* for making modifications shall be a standards compliant form such
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* gzipped tar and not one requiring a proprietary or patent encumbered
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* tool to unpack.
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*
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* Fixes/additions:
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* Steve Ralston:
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* Multiple device handling error fixes,
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* Added a queue depth.
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* Alan Cox:
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* FC920 has an rmw bug. Dont or in the end marker.
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* Removed queue walk, fixed for 64bitness.
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* Rewrote much of the code over time
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* Added indirect block lists
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* Handle 64K limits on many controllers
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* Don't use indirects on the Promise (breaks)
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* Heavily chop down the queue depths
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* Deepak Saxena:
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* Independent queues per IOP
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* Support for dynamic device creation/deletion
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* Code cleanup
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* Support for larger I/Os through merge* functions
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* (taken from DAC960 driver)
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* Boji T Kannanthanam:
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* Set the I2O Block devices to be detected in increasing
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* order of TIDs during boot.
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* Search and set the I2O block device that we boot off
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* from as the first device to be claimed (as /dev/i2o/hda)
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* Properly attach/detach I2O gendisk structure from the
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* system gendisk list. The I2O block devices now appear in
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* /proc/partitions.
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* Markus Lidel <Markus.Lidel@shadowconnect.com>:
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* Minor bugfixes for 2.6.
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*/
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#ifndef I2O_BLOCK_OSM_H
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#define I2O_BLOCK_OSM_H
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#define I2O_BLOCK_RETRY_TIME HZ/4
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#define I2O_BLOCK_MAX_OPEN_REQUESTS 50
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/* request queue sizes */
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#define I2O_BLOCK_REQ_MEMPOOL_SIZE 32
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#define KERNEL_SECTOR_SHIFT 9
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#define KERNEL_SECTOR_SIZE (1 << KERNEL_SECTOR_SHIFT)
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/* I2O Block OSM mempool struct */
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struct i2o_block_mempool {
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struct kmem_cache *slab;
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mempool_t *pool;
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};
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/* I2O Block device descriptor */
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struct i2o_block_device {
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struct i2o_device *i2o_dev; /* pointer to I2O device */
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struct gendisk *gd;
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spinlock_t lock; /* queue lock */
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struct list_head open_queue; /* list of transferred, but unfinished
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requests */
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unsigned int open_queue_depth; /* number of requests in the queue */
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int rcache; /* read cache flags */
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int wcache; /* write cache flags */
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int flags;
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u16 power; /* power state */
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int media_change_flag; /* media changed flag */
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};
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/* I2O Block device request */
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struct i2o_block_request {
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struct list_head queue;
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struct request *req; /* corresponding request */
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struct i2o_block_device *i2o_blk_dev; /* I2O block device */
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struct device *dev; /* device used for DMA */
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int sg_nents; /* number of SG elements */
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struct scatterlist sg_table[I2O_MAX_PHYS_SEGMENTS]; /* SG table */
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};
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/* I2O Block device delayed request */
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struct i2o_block_delayed_request {
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struct delayed_work work;
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struct request_queue *queue;
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};
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#endif
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