1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26
27 #ifndef _SD_IOB_H
28 #define _SD_IOB_H
29
30 #ifdef __cplusplus
31 extern "C" {
32 #endif
33
34 #define MAX_HOOK_LOCKS 32
35 typedef int (*dcb_t)(struct buf *); /* driver callback type */
36
37 /*
38 * order of end action calls:
39 * driver callback (iob_drv_iodone) is stuffed in b_iodone and called by
40 * the device driver when i/o completes. It calls the hook end action
41 * (iob_hook_iodone) which maintains the completion count (iob_hook.count)
42 * and calls the clients end action (iob_hook.func) when the chain is complete.
43 */
44 typedef struct iob_hook {
45 struct iob_hook *next_hook;
46 struct buf *chain; /* all the buffers for this iob */
47 struct buf *tail; /* tail of buffer chain */
48 int count; /* number of bufs on the chain */
49 nsc_off_t start_fba; /* initial disk block for the xfer */
50 nsc_off_t last_fba; /* last disk block for the xfer */
51 nsc_size_t size; /* # bytes for entire transfer */
52 unsigned char *last_vaddr; /* ending addr of last i/o request */
53 sdbc_ea_fn_t func; /* clients end action routine */
54 int (* iob_hook_iodone)(struct buf *, struct iob_hook *);
55 dcb_t iob_drv_iodone; /* driver call back */
56 blind_t param; /* param for clnt end action routine */
57 int flags; /* flags for each buffer */
58 int error; /* any error */
59 int skipped; /* this iob used sd_add_mem */
60 kmutex_t *lockp; /* mutex for releasing buffers */
61 kcondvar_t wait; /* sync for sleeping on synch i/o */
62 #ifdef _SD_BIO_STATS
63 int PAGE_IO, NORM_IO, SKIP_IO;
64 int PAGE_COMBINED;
65 nsc_size_t NORM_IO_SIZE;
66 #endif /* _SD_BIO_STATS */
67 } iob_hook_t;
68
69 typedef struct _sd_buf_list {
70 iob_hook_t *hooks; /* all of the iob hooks */
71 iob_hook_t *hook_head; /* free iob hook */
72 int bl_init_count; /* total count */
73 int bl_hooks_avail; /* monitor available hook count */
74 int bl_hook_lowmark; /* record if ever run out of hooks */
75 int hook_waiters; /* count of waiters */
76 int max_hook_waiters; /* record max ever waiters */
77 kcondvar_t hook_wait; /* sync for sleeping on synch i/o */
78 kmutex_t hook_locks[MAX_HOOK_LOCKS];
79 } _sd_buf_list_t;
80
81 /*
82 * NOTE: if you change this, then also make changes to the generation
83 * of sd_iob_impl*.c in src/uts/common/Makefile.files and Makefile.rules!
84 */
85 #define _SD_DEFAULT_IOBUFS 4096
86
87 /* define driver callback and driver callback function table */
88
89 #define IOB_DCBP(i) (sd_iob_dcb ## i)
90
91 #define IOB_DCB(i) \
92 int \
93 IOB_DCBP(i)(struct buf *bp) \
94 { \
95 return ((*_sd_buflist.hooks[i].iob_hook_iodone) \
96 (bp, &_sd_buflist.hooks[i])); \
97 }
98
99 extern _sd_buf_list_t _sd_buflist;
100
101 #ifdef __cplusplus
102 }
103 #endif
104
105 #endif /* _SD_IOB_H */