| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Block OSM structures/API |
| 3 | * |
| 4 | * Copyright (C) 1999-2002 Red Hat Software |
| 5 | * |
| 6 | * Written by Alan Cox, Building Number Three Ltd |
| 7 | * |
| 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. |
| 12 | * |
| 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. |
| 17 | * |
| 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 |
| 21 | * tool to unpack. |
| 22 | * |
| 23 | * Fixes/additions: |
| 24 | * Steve Ralston: |
| 25 | * Multiple device handling error fixes, |
| 26 | * Added a queue depth. |
| 27 | * Alan Cox: |
| 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 |
| 35 | * Deepak Saxena: |
| 36 | * Independent queues per IOP |
| 37 | * Support for dynamic device creation/deletion |
| 38 | * Code cleanup |
| 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 |
| 48 | * /proc/partitions. |
| 49 | * Markus Lidel <Markus.Lidel@shadowconnect.com>: |
| 50 | * Minor bugfixes for 2.6. |
| 51 | */ |
| 52 | |
| 53 | #ifndef I2O_BLOCK_OSM_H |
| 54 | #define I2O_BLOCK_OSM_H |
| 55 | |
| 56 | #define I2O_BLOCK_RETRY_TIME HZ/4 |
| 57 | #define I2O_BLOCK_MAX_OPEN_REQUESTS 50 |
| 58 | |
| 59 | /* I2O Block OSM mempool struct */ |
| 60 | struct i2o_block_mempool { |
| 61 | kmem_cache_t *slab; |
| 62 | mempool_t *pool; |
| 63 | }; |
| 64 | |
| 65 | /* I2O Block device descriptor */ |
| 66 | struct i2o_block_device { |
| 67 | struct i2o_device *i2o_dev; /* pointer to I2O device */ |
| 68 | struct gendisk *gd; |
| 69 | spinlock_t lock; /* queue lock */ |
| 70 | struct list_head open_queue; /* list of transfered, but unfinished |
| 71 | requests */ |
| 72 | unsigned int open_queue_depth; /* number of requests in the queue */ |
| 73 | |
| 74 | int rcache; /* read cache flags */ |
| 75 | int wcache; /* write cache flags */ |
| 76 | int flags; |
| 77 | int power; /* power state */ |
| 78 | int media_change_flag; /* media changed flag */ |
| 79 | }; |
| 80 | |
| 81 | /* I2O Block device request */ |
| 82 | struct i2o_block_request |
| 83 | { |
| 84 | struct list_head queue; |
| 85 | struct request *req; /* corresponding request */ |
| 86 | struct i2o_block_device *i2o_blk_dev; /* I2O block device */ |
| 87 | int sg_dma_direction; /* direction of DMA buffer read/write */ |
| 88 | int sg_nents; /* number of SG elements */ |
| 89 | struct scatterlist sg_table[I2O_MAX_SEGMENTS]; /* SG table */ |
| 90 | }; |
| 91 | |
| 92 | /* I2O Block device delayed request */ |
| 93 | struct i2o_block_delayed_request |
| 94 | { |
| 95 | struct work_struct work; |
| 96 | struct request_queue *queue; |
| 97 | }; |
| 98 | |
| 99 | #endif |