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 */ 106