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1da177e4 LT |
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 |