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 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 28 #ifndef _SYS_XDB_H 29 #define _SYS_XDB_H 30 31 #pragma ident "%Z%%M% %I% %E% SMI" 32 33 #ifdef __cplusplus 34 extern "C" { 35 #endif 36 37 #define XDB_DBG_ALL 0xf 38 #define XDB_DBG_IO 0x1 39 #define XDB_DBG_INFO 0x2 40 #define XDB_DBPRINT(lvl, fmt) { if (xdb_debug & lvl) cmn_err fmt; } 41 42 /* 43 * Info of the exported blk device 44 */ 45 #define XDB_DEV_RO (1) /* read-only or writable */ 46 #define XDB_IS_RO(vdp) ((vdp)->xs_type & XDB_DEV_RO) 47 #define XDB_DEV_LOFI (1 << 1) /* lofi device or physical device */ 48 #define XDB_IS_LOFI(vdp) ((vdp)->xs_type & XDB_DEV_LOFI) 49 #define XDB_DEV_CD (1 << 2) /* cdrom disc */ 50 #define XDB_IS_CD(vdp) ((vdp)->xs_type & XDB_DEV_CD) 51 #define XDB_DEV_RMB (1 << 3) /* removable device */ 52 #define XDB_IS_RMB(vdp) ((vdp)->xs_type & XDB_DEV_RMB) 53 54 /* 55 * Xdb interface status 56 */ 57 enum xdb_state { 58 /* 59 * initial state 60 */ 61 XDB_UNKNOWN, 62 /* 63 * frontend xenbus state changed to XenbusStateConnected, 64 * we finally connect 65 */ 66 XDB_CONNECTED, 67 /* 68 * frontend xenbus state changed to XenbusStateClosed, 69 * interface disconnected 70 */ 71 XDB_DISCONNECTED 72 }; 73 74 /* 75 * backend device status 76 */ 77 enum xdb_dev_state { 78 /* initial state */ 79 XDB_DEV_UNKNOWN, 80 /* backend device is ready (hotplug script finishes successfully) */ 81 XDB_DEV_READY 82 }; 83 84 /* 85 * frontend status 86 */ 87 enum xdb_fe_state { 88 /* initial state */ 89 XDB_FE_UNKNOWN, 90 /* 91 * frontend's xenbus state has changed to 92 * XenbusStateInitialised, is ready for connecting 93 */ 94 XDB_FE_READY 95 }; 96 97 /* 98 * Other handy macrosx 99 */ 100 #define XDB_MINOR2INST(m) (int)(m) 101 #define XDB_INST2MINOR(i) (minor_t)(i) 102 #define XDB_INST2SOFTS(instance) \ 103 ((xdb_t *)ddi_get_soft_state(xdb_statep, (instance))) 104 #define XDB_MAX_IO_PAGES BLKIF_RING_SIZE * BLKIF_MAX_SEGMENTS_PER_REQUEST 105 /* get kva of a mapped-in page coresponding to (xreq-index, seg) pair */ 106 #define XDB_IOPAGE_VA(_pagebase, _xreqidx, _seg) \ 107 ((_pagebase) + ((_xreqidx) \ 108 * BLKIF_MAX_SEGMENTS_PER_REQUEST \ 109 + (_seg)) * PAGESIZE) 110 #define XDB_XREQ2BP(xreq) (&(xreq)->xr_buf) 111 #define XDB_BP2XREQ(bp) \ 112 ((xdb_request_t *)((char *)(bp) - offsetof(xdb_request_t, xr_buf))) 113 114 /* describe one blkif segment */ 115 typedef struct xdb_seg { 116 uint8_t fs; /* start sector # within this page (segment) */ 117 uint8_t ls; /* end sector # within this page (segment) */ 118 } xdb_seg_t; 119 120 typedef struct xdb xdb_t; 121 122 /* one blkif_request_t matches one xdb_request_t */ 123 typedef struct xdb_request { 124 /* buf associated with this I/O request */ 125 buf_t xr_buf; 126 /* softstate instance associated with this I/O request */ 127 xdb_t *xr_vdp; 128 /* the next segment we're going to process */ 129 int xr_curseg; 130 /* index of this xdb_request_t in vdp->xs_req */ 131 int xr_idx; 132 /* next index for a statical linked list */ 133 int xr_next; 134 /* 'id' copied from blkif_request_t */ 135 uint64_t xr_id; 136 /* 'operation' copied from blkif_request_t */ 137 uint8_t xr_op; 138 /* how many pages(segments) in this I/O request */ 139 uint8_t xr_buf_pages; 140 /* all segments of this I/O request */ 141 xdb_seg_t xr_segs[BLKIF_MAX_SEGMENTS_PER_REQUEST]; 142 /* all grant table handles used in this I/O request */ 143 grant_handle_t xr_page_hdls[BLKIF_MAX_SEGMENTS_PER_REQUEST]; 144 struct page xr_plist[BLKIF_MAX_SEGMENTS_PER_REQUEST]; 145 struct page *xr_pplist[BLKIF_MAX_SEGMENTS_PER_REQUEST]; 146 } xdb_request_t; 147 148 /* Soft state data structure for each backend vbd */ 149 struct xdb { 150 /* devinfo node pointer of this xdb */ 151 dev_info_t *xs_dip; 152 /* coresponding frontend domain id */ 153 domid_t xs_peer; 154 /* read-only, removable, cdrom? */ 155 uint32_t xs_type; 156 /* # of total sectors */ 157 uint64_t xs_sectors; 158 /* blkif I/O request ring buffer */ 159 xendev_ring_t *xs_ring; 160 /* handle to access the ring buffer */ 161 ddi_acc_handle_t xs_ring_hdl; 162 ldi_ident_t xs_ldi_li; 163 ldi_handle_t xs_ldi_hdl; 164 /* base kva for mapped-in I/O page from frontend domain */ 165 caddr_t xs_iopage_va; 166 /* mutex lock for I/O related code path */ 167 kmutex_t xs_iomutex; 168 /* 169 * mutex lock for event handling related code path 170 * need to be grabbed before xs_iomutex 171 */ 172 kmutex_t xs_cbmutex; 173 /* # of on-going I/O buf in backend domain */ 174 uint_t xs_ionum; 175 /* task thread for pushing buf to underlying target driver */ 176 ddi_taskq_t *xs_iotaskq; 177 /* cv used in I/O code path, protected by xs_iomutex */ 178 kcondvar_t xs_iocv; 179 kcondvar_t xs_ionumcv; 180 /* 181 * head and tail of linked list for I/O bufs need to be pushed to 182 * underlying target driver 183 */ 184 buf_t *xs_f_iobuf; 185 buf_t *xs_l_iobuf; 186 /* xdb interface status */ 187 enum xdb_state xs_if_status; 188 /* backend device status */ 189 enum xdb_dev_state xs_dev_status; 190 /* frontend status */ 191 enum xdb_fe_state xs_fe_status; 192 /* head of free list of xdb_request_t */ 193 int xs_free_req; 194 /* pre-allocated xdb_request_t pool */ 195 xdb_request_t xs_req[BLKIF_RING_SIZE]; 196 kstat_t *xs_kstats; 197 uint64_t xs_stat_req_reads; 198 uint64_t xs_stat_req_writes; 199 uint64_t xs_stat_req_barriers; 200 uint64_t xs_stat_req_flushes; 201 #ifdef DEBUG 202 uint64_t page_addrs[XDB_MAX_IO_PAGES]; /* for debug aid */ 203 #endif /* DEBUG */ 204 }; 205 206 #ifdef __cplusplus 207 } 208 #endif 209 210 #endif /* _SYS_XDB_H */ 211