You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
3.3 KiB
103 lines
3.3 KiB
/*
|
|
* Block OSM structures/API
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef I2O_BLOCK_OSM_H
|
|
#define I2O_BLOCK_OSM_H
|
|
|
|
#define I2O_BLOCK_RETRY_TIME HZ/4
|
|
#define I2O_BLOCK_MAX_OPEN_REQUESTS 50
|
|
|
|
/* request queue sizes */
|
|
#define I2O_BLOCK_REQ_MEMPOOL_SIZE 32
|
|
|
|
#define KERNEL_SECTOR_SHIFT 9
|
|
#define KERNEL_SECTOR_SIZE (1 << KERNEL_SECTOR_SHIFT)
|
|
|
|
/* I2O Block OSM mempool struct */
|
|
struct i2o_block_mempool {
|
|
kmem_cache_t *slab;
|
|
mempool_t *pool;
|
|
};
|
|
|
|
/* I2O Block device descriptor */
|
|
struct i2o_block_device {
|
|
struct i2o_device *i2o_dev; /* pointer to I2O device */
|
|
struct gendisk *gd;
|
|
spinlock_t lock; /* queue lock */
|
|
struct list_head open_queue; /* list of transfered, but unfinished
|
|
requests */
|
|
unsigned int open_queue_depth; /* number of requests in the queue */
|
|
|
|
int rcache; /* read cache flags */
|
|
int wcache; /* write cache flags */
|
|
int flags;
|
|
u16 power; /* power state */
|
|
int media_change_flag; /* media changed flag */
|
|
};
|
|
|
|
/* I2O Block device request */
|
|
struct i2o_block_request {
|
|
struct list_head queue;
|
|
struct request *req; /* corresponding request */
|
|
struct i2o_block_device *i2o_blk_dev; /* I2O block device */
|
|
struct device *dev; /* device used for DMA */
|
|
int sg_nents; /* number of SG elements */
|
|
struct scatterlist sg_table[I2O_MAX_PHYS_SEGMENTS]; /* SG table */
|
|
};
|
|
|
|
/* I2O Block device delayed request */
|
|
struct i2o_block_delayed_request {
|
|
struct work_struct work;
|
|
struct request_queue *queue;
|
|
};
|
|
|
|
#endif
|
|
|