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 2009 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * Note: This is the backend part of the split PV disk driver. This driver 29 * is not a nexus driver, nor is it a leaf driver(block/char/stream driver). 30 * Currently, it does not create any minor node. So, although, it runs in 31 * backend domain, it will not be used directly from within dom0. 32 * It simply gets block I/O requests issued by frontend from a shared page 33 * (blkif ring buffer - defined by Xen) between backend and frontend domain, 34 * generates a buf, and push it down to underlying disk target driver via 35 * ldi interface. When buf is done, this driver will generate a response 36 * and put it into ring buffer to inform frontend of the status of the I/O 37 * request issued by it. When a new virtual device entry is added in xenstore, 38 * there will be an watch event sent from Xen to xvdi framework, who will, 39 * in turn, create the devinfo node and try to attach this driver 40 * (see xvdi_create_dev). When frontend peer changes its state to 41 * XenbusStateClose, an event will also be sent from Xen to xvdi framework, 42 * who will detach and remove this devinfo node (see i_xvdi_oestate_handler). 43 * I/O requests get from ring buffer and event coming from xenstore cannot be 44 * trusted. We verify them in xdb_get_buf() and xdb_check_state_transition(). 45 * 46 * Virtual device configuration is read/written from/to the database via 47 * xenbus_* interfaces. Driver also use xvdi_* to interact with hypervisor. 48 * There is an on-going effort to make xvdi_* cover all xenbus_*. 49 */ 50 51 #include <sys/types.h> 52 #include <sys/conf.h> 53 #include <sys/ddi.h> 54 #include <sys/dditypes.h> 55 #include <sys/sunddi.h> 56 #include <sys/list.h> 57 #include <sys/dkio.h> 58 #include <sys/cmlb.h> 59 #include <sys/vtoc.h> 60 #include <sys/modctl.h> 61 #include <sys/bootconf.h> 62 #include <sys/promif.h> 63 #include <sys/sysmacros.h> 64 #include <public/io/xenbus.h> 65 #include <public/io/xs_wire.h> 66 #include <xen/sys/xenbus_impl.h> 67 #include <xen/sys/xendev.h> 68 #include <sys/gnttab.h> 69 #include <sys/scsi/generic/inquiry.h> 70 #include <vm/seg_kmem.h> 71 #include <vm/hat_i86.h> 72 #include <sys/gnttab.h> 73 #include <sys/lofi.h> 74 #include <io/xdf.h> 75 #include <xen/io/blkif_impl.h> 76 #include <io/xdb.h> 77 78 static xdb_t *xdb_statep; 79 static int xdb_debug = 0; 80 81 static void xdb_close(dev_info_t *); 82 static int xdb_push_response(xdb_t *, uint64_t, uint8_t, uint16_t); 83 static int xdb_get_request(xdb_t *, blkif_request_t *); 84 static void blkif_get_x86_32_req(blkif_request_t *, blkif_x86_32_request_t *); 85 static void blkif_get_x86_64_req(blkif_request_t *, blkif_x86_64_request_t *); 86 static int xdb_biodone(buf_t *); 87 88 89 #ifdef DEBUG 90 /* 91 * debug aid functions 92 */ 93 94 static void 95 logva(xdb_t *vdp, uint64_t va) 96 { 97 uint64_t *page_addrs; 98 int i; 99 100 page_addrs = vdp->page_addrs; 101 for (i = 0; i < XDB_MAX_IO_PAGES(vdp); i++) { 102 if (page_addrs[i] == va) 103 debug_enter("VA remapping found!"); 104 } 105 106 for (i = 0; i < XDB_MAX_IO_PAGES(vdp); i++) { 107 if (page_addrs[i] == 0) { 108 page_addrs[i] = va; 109 break; 110 } 111 } 112 ASSERT(i < XDB_MAX_IO_PAGES(vdp)); 113 } 114 115 static void 116 unlogva(xdb_t *vdp, uint64_t va) 117 { 118 uint64_t *page_addrs; 119 int i; 120 121 page_addrs = vdp->page_addrs; 122 for (i = 0; i < XDB_MAX_IO_PAGES(vdp); i++) { 123 if (page_addrs[i] == va) { 124 page_addrs[i] = 0; 125 break; 126 } 127 } 128 ASSERT(i < XDB_MAX_IO_PAGES(vdp)); 129 } 130 131 static void 132 xdb_dump_request_oe(blkif_request_t *req) 133 { 134 int i; 135 136 /* 137 * Exploit the public interface definitions for BLKIF_OP_READ 138 * etc.. 139 */ 140 char *op_name[] = { "read", "write", "barrier", "flush" }; 141 142 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, "op=%s", op_name[req->operation])); 143 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, "num of segments=%d", 144 req->nr_segments)); 145 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, "handle=%d", req->handle)); 146 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, "id=%llu", 147 (unsigned long long)req->id)); 148 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, "start sector=%llu", 149 (unsigned long long)req->sector_number)); 150 for (i = 0; i < req->nr_segments; i++) { 151 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, "gref=%d, first sec=%d," 152 "last sec=%d", req->seg[i].gref, req->seg[i].first_sect, 153 req->seg[i].last_sect)); 154 } 155 } 156 #endif /* DEBUG */ 157 158 /* 159 * Statistics. 160 */ 161 static char *xdb_stats[] = { 162 "rd_reqs", 163 "wr_reqs", 164 "br_reqs", 165 "fl_reqs", 166 "oo_reqs" 167 }; 168 169 static int 170 xdb_kstat_update(kstat_t *ksp, int flag) 171 { 172 xdb_t *vdp; 173 kstat_named_t *knp; 174 175 if (flag != KSTAT_READ) 176 return (EACCES); 177 178 vdp = ksp->ks_private; 179 knp = ksp->ks_data; 180 181 /* 182 * Assignment order should match that of the names in 183 * xdb_stats. 184 */ 185 (knp++)->value.ui64 = vdp->xs_stat_req_reads; 186 (knp++)->value.ui64 = vdp->xs_stat_req_writes; 187 (knp++)->value.ui64 = vdp->xs_stat_req_barriers; 188 (knp++)->value.ui64 = vdp->xs_stat_req_flushes; 189 (knp++)->value.ui64 = 0; /* oo_req */ 190 191 return (0); 192 } 193 194 static boolean_t 195 xdb_kstat_init(xdb_t *vdp) 196 { 197 int nstat = sizeof (xdb_stats) / sizeof (xdb_stats[0]); 198 char **cp = xdb_stats; 199 kstat_named_t *knp; 200 201 if ((vdp->xs_kstats = kstat_create("xdb", 202 ddi_get_instance(vdp->xs_dip), 203 "req_statistics", "block", KSTAT_TYPE_NAMED, 204 nstat, 0)) == NULL) 205 return (B_FALSE); 206 207 vdp->xs_kstats->ks_private = vdp; 208 vdp->xs_kstats->ks_update = xdb_kstat_update; 209 210 knp = vdp->xs_kstats->ks_data; 211 while (nstat > 0) { 212 kstat_named_init(knp, *cp, KSTAT_DATA_UINT64); 213 knp++; 214 cp++; 215 nstat--; 216 } 217 218 kstat_install(vdp->xs_kstats); 219 220 return (B_TRUE); 221 } 222 223 static char * 224 i_pathname(dev_info_t *dip) 225 { 226 char *path, *rv; 227 228 path = kmem_alloc(MAXPATHLEN, KM_SLEEP); 229 (void) ddi_pathname(dip, path); 230 rv = strdup(path); 231 kmem_free(path, MAXPATHLEN); 232 233 return (rv); 234 } 235 236 static buf_t * 237 xdb_get_buf(xdb_t *vdp, blkif_request_t *req, xdb_request_t *xreq) 238 { 239 buf_t *bp; 240 uint8_t segs, curseg; 241 int sectors; 242 int i, err; 243 gnttab_map_grant_ref_t mapops[BLKIF_MAX_SEGMENTS_PER_REQUEST]; 244 ddi_acc_handle_t acchdl; 245 246 acchdl = vdp->xs_ring_hdl; 247 bp = XDB_XREQ2BP(xreq); 248 curseg = xreq->xr_curseg; 249 /* init a new xdb request */ 250 if (req != NULL) { 251 ASSERT(MUTEX_HELD(&vdp->xs_iomutex)); 252 boolean_t pagemapok = B_TRUE; 253 uint8_t op = ddi_get8(acchdl, &req->operation); 254 255 xreq->xr_vdp = vdp; 256 xreq->xr_op = op; 257 xreq->xr_id = ddi_get64(acchdl, &req->id); 258 segs = xreq->xr_buf_pages = ddi_get8(acchdl, &req->nr_segments); 259 if (segs == 0) { 260 if (op != BLKIF_OP_FLUSH_DISKCACHE) 261 cmn_err(CE_WARN, "!non-BLKIF_OP_FLUSH_DISKCACHE" 262 " is seen from domain %d with zero " 263 "length data buffer!", vdp->xs_peer); 264 bioinit(bp); 265 bp->b_bcount = 0; 266 bp->b_lblkno = 0; 267 bp->b_un.b_addr = NULL; 268 return (bp); 269 } else if (op == BLKIF_OP_FLUSH_DISKCACHE) { 270 cmn_err(CE_WARN, "!BLKIF_OP_FLUSH_DISKCACHE" 271 " is seen from domain %d with non-zero " 272 "length data buffer!", vdp->xs_peer); 273 } 274 275 /* 276 * segs should be no bigger than BLKIF_MAX_SEGMENTS_PER_REQUEST 277 * according to the definition of blk interface by Xen 278 * we do sanity check here 279 */ 280 if (segs > BLKIF_MAX_SEGMENTS_PER_REQUEST) 281 segs = xreq->xr_buf_pages = 282 BLKIF_MAX_SEGMENTS_PER_REQUEST; 283 284 for (i = 0; i < segs; i++) { 285 uint8_t fs, ls; 286 287 mapops[i].host_addr = 288 (uint64_t)(uintptr_t)XDB_IOPAGE_VA( 289 vdp->xs_iopage_va, xreq->xr_idx, i); 290 mapops[i].dom = vdp->xs_peer; 291 mapops[i].ref = ddi_get32(acchdl, &req->seg[i].gref); 292 mapops[i].flags = GNTMAP_host_map; 293 if (op != BLKIF_OP_READ) 294 mapops[i].flags |= GNTMAP_readonly; 295 296 fs = ddi_get8(acchdl, &req->seg[i].first_sect); 297 ls = ddi_get8(acchdl, &req->seg[i].last_sect); 298 299 /* 300 * first_sect should be no bigger than last_sect and 301 * both of them should be no bigger than 302 * XB_LAST_SECTOR_IN_SEG according to definition 303 * of blk interface by Xen, so sanity check again 304 */ 305 if (fs > XB_LAST_SECTOR_IN_SEG) 306 fs = XB_LAST_SECTOR_IN_SEG; 307 if (ls > XB_LAST_SECTOR_IN_SEG) 308 ls = XB_LAST_SECTOR_IN_SEG; 309 if (fs > ls) 310 fs = ls; 311 312 xreq->xr_segs[i].fs = fs; 313 xreq->xr_segs[i].ls = ls; 314 } 315 316 /* map in io pages */ 317 err = xen_map_gref(GNTTABOP_map_grant_ref, mapops, i, B_FALSE); 318 if (err != 0) 319 return (NULL); 320 for (i = 0; i < segs; i++) { 321 /* 322 * Although HYPERVISOR_grant_table_op() returned no 323 * error, mapping of each single page can fail. So, 324 * we have to do the check here and handle the error 325 * if needed 326 */ 327 if (mapops[i].status != GNTST_okay) { 328 int j; 329 for (j = 0; j < i; j++) { 330 #ifdef DEBUG 331 unlogva(vdp, mapops[j].host_addr); 332 #endif 333 xen_release_pfn( 334 xreq->xr_plist[j].p_pagenum); 335 } 336 pagemapok = B_FALSE; 337 break; 338 } 339 /* record page mapping handle for unmapping later */ 340 xreq->xr_page_hdls[i] = mapops[i].handle; 341 #ifdef DEBUG 342 logva(vdp, mapops[i].host_addr); 343 #endif 344 /* 345 * Pass the MFNs down using the shadow list (xr_pplist) 346 * 347 * This is pretty ugly since we have implict knowledge 348 * of how the rootnex binds buffers. 349 * The GNTTABOP_map_grant_ref op makes us do some ugly 350 * stuff since we're not allowed to touch these PTEs 351 * from the VM. 352 * 353 * Obviously, these aren't real page_t's. The rootnex 354 * only needs p_pagenum. 355 * Also, don't use btop() here or 32 bit PAE breaks. 356 */ 357 xreq->xr_pplist[i] = &xreq->xr_plist[i]; 358 xreq->xr_plist[i].p_pagenum = 359 xen_assign_pfn(mapops[i].dev_bus_addr >> PAGESHIFT); 360 } 361 362 /* 363 * not all pages mapped in successfully, unmap those mapped-in 364 * page and return failure 365 */ 366 if (!pagemapok) { 367 gnttab_unmap_grant_ref_t unmapop; 368 369 for (i = 0; i < segs; i++) { 370 if (mapops[i].status != GNTST_okay) 371 continue; 372 unmapop.host_addr = 373 (uint64_t)(uintptr_t)XDB_IOPAGE_VA( 374 vdp->xs_iopage_va, xreq->xr_idx, i); 375 unmapop.dev_bus_addr = NULL; 376 unmapop.handle = mapops[i].handle; 377 (void) HYPERVISOR_grant_table_op( 378 GNTTABOP_unmap_grant_ref, &unmapop, 1); 379 } 380 381 return (NULL); 382 } 383 bioinit(bp); 384 bp->b_lblkno = ddi_get64(acchdl, &req->sector_number); 385 bp->b_flags = B_BUSY | B_SHADOW | B_PHYS; 386 bp->b_flags |= (ddi_get8(acchdl, &req->operation) == 387 BLKIF_OP_READ) ? B_READ : (B_WRITE | B_ASYNC); 388 } else { 389 uint64_t blkst; 390 int isread; 391 392 /* reuse this buf */ 393 blkst = bp->b_lblkno + bp->b_bcount / DEV_BSIZE; 394 isread = bp->b_flags & B_READ; 395 bioreset(bp); 396 bp->b_lblkno = blkst; 397 bp->b_flags = B_BUSY | B_SHADOW | B_PHYS; 398 bp->b_flags |= isread ? B_READ : (B_WRITE | B_ASYNC); 399 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, "reuse buf, xreq is %d!!", 400 xreq->xr_idx)); 401 } 402 403 /* form a buf */ 404 bp->b_un.b_addr = XDB_IOPAGE_VA(vdp->xs_iopage_va, xreq->xr_idx, 405 curseg) + xreq->xr_segs[curseg].fs * DEV_BSIZE; 406 bp->b_shadow = &xreq->xr_pplist[curseg]; 407 bp->b_iodone = xdb_biodone; 408 sectors = 0; 409 410 /* 411 * Run through the segments. There are XB_NUM_SECTORS_PER_SEG sectors 412 * per segment. On some OSes (e.g. Linux), there may be empty gaps 413 * between segments. (i.e. the first segment may end on sector 6 and 414 * the second segment start on sector 4). 415 * 416 * if a segments first sector is not set to 0, and this is not the 417 * first segment in our buf, end this buf now. 418 * 419 * if a segments last sector is not set to XB_LAST_SECTOR_IN_SEG, and 420 * this is not the last segment in the request, add this segment into 421 * the buf, then end this buf (updating the pointer to point to the 422 * next segment next time around). 423 */ 424 for (i = curseg; i < xreq->xr_buf_pages; i++) { 425 if ((xreq->xr_segs[i].fs != 0) && (i != curseg)) { 426 break; 427 } 428 sectors += (xreq->xr_segs[i].ls - xreq->xr_segs[i].fs + 1); 429 if ((xreq->xr_segs[i].ls != XB_LAST_SECTOR_IN_SEG) && 430 (i != (xreq->xr_buf_pages - 1))) { 431 i++; 432 break; 433 } 434 } 435 xreq->xr_curseg = i; 436 bp->b_bcount = sectors * DEV_BSIZE; 437 bp->b_bufsize = bp->b_bcount; 438 439 return (bp); 440 } 441 442 static xdb_request_t * 443 xdb_get_req(xdb_t *vdp) 444 { 445 xdb_request_t *req; 446 int idx; 447 448 ASSERT(MUTEX_HELD(&vdp->xs_iomutex)); 449 ASSERT(vdp->xs_free_req != -1); 450 req = &vdp->xs_req[vdp->xs_free_req]; 451 vdp->xs_free_req = req->xr_next; 452 idx = req->xr_idx; 453 bzero(req, sizeof (xdb_request_t)); 454 req->xr_idx = idx; 455 return (req); 456 } 457 458 static void 459 xdb_free_req(xdb_request_t *req) 460 { 461 xdb_t *vdp = req->xr_vdp; 462 463 ASSERT(MUTEX_HELD(&vdp->xs_iomutex)); 464 req->xr_next = vdp->xs_free_req; 465 vdp->xs_free_req = req->xr_idx; 466 } 467 468 static void 469 xdb_response(xdb_t *vdp, blkif_request_t *req, boolean_t ok) 470 { 471 ddi_acc_handle_t acchdl = vdp->xs_ring_hdl; 472 473 if (xdb_push_response(vdp, ddi_get64(acchdl, &req->id), 474 ddi_get8(acchdl, &req->operation), ok)) 475 xvdi_notify_oe(vdp->xs_dip); 476 } 477 478 static void 479 xdb_init_ioreqs(xdb_t *vdp) 480 { 481 int i; 482 483 ASSERT(vdp->xs_nentry); 484 485 if (vdp->xs_req == NULL) 486 vdp->xs_req = kmem_alloc(vdp->xs_nentry * 487 sizeof (xdb_request_t), KM_SLEEP); 488 #ifdef DEBUG 489 if (vdp->page_addrs == NULL) 490 vdp->page_addrs = kmem_zalloc(XDB_MAX_IO_PAGES(vdp) * 491 sizeof (uint64_t), KM_SLEEP); 492 #endif 493 for (i = 0; i < vdp->xs_nentry; i++) { 494 vdp->xs_req[i].xr_idx = i; 495 vdp->xs_req[i].xr_next = i + 1; 496 } 497 vdp->xs_req[vdp->xs_nentry - 1].xr_next = -1; 498 vdp->xs_free_req = 0; 499 500 /* alloc va in host dom for io page mapping */ 501 vdp->xs_iopage_va = vmem_xalloc(heap_arena, 502 XDB_MAX_IO_PAGES(vdp) * PAGESIZE, PAGESIZE, 0, 0, 0, 0, 503 VM_SLEEP); 504 for (i = 0; i < XDB_MAX_IO_PAGES(vdp); i++) 505 hat_prepare_mapping(kas.a_hat, 506 vdp->xs_iopage_va + i * PAGESIZE, NULL); 507 } 508 509 static void 510 xdb_uninit_ioreqs(xdb_t *vdp) 511 { 512 int i; 513 514 for (i = 0; i < XDB_MAX_IO_PAGES(vdp); i++) 515 hat_release_mapping(kas.a_hat, 516 vdp->xs_iopage_va + i * PAGESIZE); 517 vmem_xfree(heap_arena, vdp->xs_iopage_va, 518 XDB_MAX_IO_PAGES(vdp) * PAGESIZE); 519 if (vdp->xs_req != NULL) { 520 kmem_free(vdp->xs_req, vdp->xs_nentry * sizeof (xdb_request_t)); 521 vdp->xs_req = NULL; 522 } 523 #ifdef DEBUG 524 if (vdp->page_addrs != NULL) { 525 kmem_free(vdp->page_addrs, XDB_MAX_IO_PAGES(vdp) * 526 sizeof (uint64_t)); 527 vdp->page_addrs = NULL; 528 } 529 #endif 530 } 531 532 static uint_t 533 xdb_intr(caddr_t arg) 534 { 535 xdb_t *vdp = (xdb_t *)arg; 536 dev_info_t *dip = vdp->xs_dip; 537 blkif_request_t req, *reqp = &req; 538 xdb_request_t *xreq; 539 buf_t *bp; 540 uint8_t op; 541 int ret = DDI_INTR_UNCLAIMED; 542 543 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, 544 "xdb@%s: I/O request received from dom %d", 545 ddi_get_name_addr(dip), vdp->xs_peer)); 546 547 mutex_enter(&vdp->xs_iomutex); 548 549 /* shouldn't touch ring buffer if not in connected state */ 550 if (!vdp->xs_if_connected) { 551 mutex_exit(&vdp->xs_iomutex); 552 return (DDI_INTR_UNCLAIMED); 553 } 554 ASSERT(vdp->xs_hp_connected && vdp->xs_fe_initialised); 555 556 /* 557 * We'll loop till there is no more request in the ring 558 * We won't stuck in this loop for ever since the size of ring buffer 559 * is limited, and frontend will stop pushing requests into it when 560 * the ring buffer is full 561 */ 562 563 /* req_event will be increased in xvdi_ring_get_request() */ 564 while (xdb_get_request(vdp, reqp)) { 565 ret = DDI_INTR_CLAIMED; 566 567 op = ddi_get8(vdp->xs_ring_hdl, &reqp->operation); 568 if (op == BLKIF_OP_READ || 569 op == BLKIF_OP_WRITE || 570 op == BLKIF_OP_WRITE_BARRIER || 571 op == BLKIF_OP_FLUSH_DISKCACHE) { 572 #ifdef DEBUG 573 xdb_dump_request_oe(reqp); 574 #endif 575 xreq = xdb_get_req(vdp); 576 ASSERT(xreq); 577 switch (op) { 578 case BLKIF_OP_READ: 579 vdp->xs_stat_req_reads++; 580 break; 581 case BLKIF_OP_WRITE_BARRIER: 582 vdp->xs_stat_req_barriers++; 583 /* FALLTHRU */ 584 case BLKIF_OP_WRITE: 585 vdp->xs_stat_req_writes++; 586 break; 587 case BLKIF_OP_FLUSH_DISKCACHE: 588 vdp->xs_stat_req_flushes++; 589 break; 590 } 591 592 xreq->xr_curseg = 0; /* start from first segment */ 593 bp = xdb_get_buf(vdp, reqp, xreq); 594 if (bp == NULL) { 595 /* failed to form a buf */ 596 xdb_free_req(xreq); 597 xdb_response(vdp, reqp, B_FALSE); 598 continue; 599 } 600 bp->av_forw = NULL; 601 602 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, 603 " buf %p, blkno %lld, size %lu, addr %p", 604 (void *)bp, (longlong_t)bp->b_blkno, 605 (ulong_t)bp->b_bcount, (void *)bp->b_un.b_addr)); 606 607 /* send bp to underlying blk driver */ 608 if (vdp->xs_f_iobuf == NULL) { 609 vdp->xs_f_iobuf = vdp->xs_l_iobuf = bp; 610 } else { 611 vdp->xs_l_iobuf->av_forw = bp; 612 vdp->xs_l_iobuf = bp; 613 } 614 } else { 615 xdb_response(vdp, reqp, B_FALSE); 616 XDB_DBPRINT(XDB_DBG_IO, (CE_WARN, "xdb@%s: " 617 "Unsupported cmd received from dom %d", 618 ddi_get_name_addr(dip), vdp->xs_peer)); 619 } 620 } 621 /* notify our taskq to push buf to underlying blk driver */ 622 if (ret == DDI_INTR_CLAIMED) 623 cv_broadcast(&vdp->xs_iocv); 624 625 mutex_exit(&vdp->xs_iomutex); 626 627 return (ret); 628 } 629 630 static int 631 xdb_biodone(buf_t *bp) 632 { 633 int i, err, bioerr; 634 uint8_t segs; 635 gnttab_unmap_grant_ref_t unmapops[BLKIF_MAX_SEGMENTS_PER_REQUEST]; 636 xdb_request_t *xreq = XDB_BP2XREQ(bp); 637 xdb_t *vdp = xreq->xr_vdp; 638 buf_t *nbp; 639 640 bioerr = geterror(bp); 641 if (bioerr) 642 XDB_DBPRINT(XDB_DBG_IO, (CE_WARN, "xdb@%s: I/O error %d", 643 ddi_get_name_addr(vdp->xs_dip), bioerr)); 644 645 /* check if we are done w/ this I/O request */ 646 if ((bioerr == 0) && (xreq->xr_curseg < xreq->xr_buf_pages)) { 647 nbp = xdb_get_buf(vdp, NULL, xreq); 648 if (nbp) { 649 err = ldi_strategy(vdp->xs_ldi_hdl, nbp); 650 if (err == 0) { 651 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, 652 "sent buf to backend ok")); 653 return (DDI_SUCCESS); 654 } 655 bioerr = EIO; 656 XDB_DBPRINT(XDB_DBG_IO, (CE_WARN, "xdb@%s: " 657 "sent buf to backend dev failed, err=%d", 658 ddi_get_name_addr(vdp->xs_dip), err)); 659 } else { 660 bioerr = EIO; 661 } 662 } 663 664 /* unmap io pages */ 665 segs = xreq->xr_buf_pages; 666 /* 667 * segs should be no bigger than BLKIF_MAX_SEGMENTS_PER_REQUEST 668 * according to the definition of blk interface by Xen 669 */ 670 ASSERT(segs <= BLKIF_MAX_SEGMENTS_PER_REQUEST); 671 for (i = 0; i < segs; i++) { 672 unmapops[i].host_addr = (uint64_t)(uintptr_t)XDB_IOPAGE_VA( 673 vdp->xs_iopage_va, xreq->xr_idx, i); 674 #ifdef DEBUG 675 mutex_enter(&vdp->xs_iomutex); 676 unlogva(vdp, unmapops[i].host_addr); 677 mutex_exit(&vdp->xs_iomutex); 678 #endif 679 unmapops[i].dev_bus_addr = NULL; 680 unmapops[i].handle = xreq->xr_page_hdls[i]; 681 } 682 err = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, 683 unmapops, segs); 684 ASSERT(!err); 685 686 /* 687 * If we have reached a barrier write or a cache flush , then we must 688 * flush all our I/Os. 689 */ 690 if (xreq->xr_op == BLKIF_OP_WRITE_BARRIER || 691 xreq->xr_op == BLKIF_OP_FLUSH_DISKCACHE) { 692 /* 693 * XXX At this point the write did succeed, so I don't 694 * believe we should report an error because the flush 695 * failed. However, this is a debatable point, so 696 * maybe we need to think more carefully about this. 697 * For now, just cast to void. 698 */ 699 (void) ldi_ioctl(vdp->xs_ldi_hdl, 700 DKIOCFLUSHWRITECACHE, NULL, FKIOCTL, kcred, NULL); 701 } 702 703 mutex_enter(&vdp->xs_iomutex); 704 705 /* send response back to frontend */ 706 if (vdp->xs_if_connected) { 707 ASSERT(vdp->xs_hp_connected && vdp->xs_fe_initialised); 708 if (xdb_push_response(vdp, xreq->xr_id, xreq->xr_op, bioerr)) 709 xvdi_notify_oe(vdp->xs_dip); 710 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, 711 "sent resp back to frontend, id=%llu", 712 (unsigned long long)xreq->xr_id)); 713 } 714 /* free io resources */ 715 biofini(bp); 716 xdb_free_req(xreq); 717 718 vdp->xs_ionum--; 719 if (!vdp->xs_if_connected && (vdp->xs_ionum == 0)) { 720 /* we're closing, someone is waiting for I/O clean-up */ 721 cv_signal(&vdp->xs_ionumcv); 722 } 723 724 mutex_exit(&vdp->xs_iomutex); 725 726 return (DDI_SUCCESS); 727 } 728 729 static int 730 xdb_bindto_frontend(xdb_t *vdp) 731 { 732 int err; 733 char *oename; 734 grant_ref_t gref; 735 evtchn_port_t evtchn; 736 dev_info_t *dip = vdp->xs_dip; 737 char protocol[64] = ""; 738 739 ASSERT(MUTEX_HELD(&vdp->xs_cbmutex)); 740 741 /* 742 * Switch to the XenbusStateInitialised state. This let's the 743 * frontend know that we're about to negotiate a connection. 744 */ 745 (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateInitialised); 746 747 /* 748 * Gather info from frontend 749 */ 750 oename = xvdi_get_oename(dip); 751 if (oename == NULL) 752 return (DDI_FAILURE); 753 754 err = xenbus_gather(XBT_NULL, oename, 755 XBP_RING_REF, "%lu", &gref, 756 XBP_EVENT_CHAN, "%u", &evtchn, 757 NULL); 758 if (err != 0) { 759 xvdi_dev_error(dip, err, 760 "Getting ring-ref and evtchn from frontend"); 761 return (DDI_FAILURE); 762 } 763 764 vdp->xs_blk_protocol = BLKIF_PROTOCOL_NATIVE; 765 vdp->xs_nentry = BLKIF_RING_SIZE; 766 vdp->xs_entrysize = sizeof (union blkif_sring_entry); 767 768 err = xenbus_gather(XBT_NULL, oename, 769 XBP_PROTOCOL, "%63s", protocol, NULL); 770 if (err) 771 (void) strcpy(protocol, "unspecified, assuming native"); 772 else { 773 /* 774 * We must check for NATIVE first, so that the fast path 775 * is taken for copying data from the guest to the host. 776 */ 777 if (strcmp(protocol, XEN_IO_PROTO_ABI_NATIVE) != 0) { 778 if (strcmp(protocol, XEN_IO_PROTO_ABI_X86_32) == 0) { 779 vdp->xs_blk_protocol = BLKIF_PROTOCOL_X86_32; 780 vdp->xs_nentry = BLKIF_X86_32_RING_SIZE; 781 vdp->xs_entrysize = 782 sizeof (union blkif_x86_32_sring_entry); 783 } else if (strcmp(protocol, XEN_IO_PROTO_ABI_X86_64) == 784 0) { 785 vdp->xs_blk_protocol = BLKIF_PROTOCOL_X86_64; 786 vdp->xs_nentry = BLKIF_X86_64_RING_SIZE; 787 vdp->xs_entrysize = 788 sizeof (union blkif_x86_64_sring_entry); 789 } else { 790 xvdi_fatal_error(dip, err, "unknown protocol"); 791 return (DDI_FAILURE); 792 } 793 } 794 } 795 #ifdef DEBUG 796 cmn_err(CE_NOTE, "!xdb@%s: blkif protocol '%s' ", 797 ddi_get_name_addr(dip), protocol); 798 #endif 799 800 /* 801 * Map and init ring. The ring parameters must match those which 802 * have been allocated in the front end. 803 */ 804 if (xvdi_map_ring(dip, vdp->xs_nentry, vdp->xs_entrysize, 805 gref, &vdp->xs_ring) != DDI_SUCCESS) 806 return (DDI_FAILURE); 807 808 /* 809 * This will be removed after we use shadow I/O ring request since 810 * we don't need to access the ring itself directly, thus the access 811 * handle is not needed 812 */ 813 vdp->xs_ring_hdl = vdp->xs_ring->xr_acc_hdl; 814 815 /* bind event channel */ 816 err = xvdi_bind_evtchn(dip, evtchn); 817 if (err != DDI_SUCCESS) { 818 xvdi_unmap_ring(vdp->xs_ring); 819 return (DDI_FAILURE); 820 } 821 822 return (DDI_SUCCESS); 823 } 824 825 static void 826 xdb_unbindfrom_frontend(xdb_t *vdp) 827 { 828 ASSERT(MUTEX_HELD(&vdp->xs_cbmutex)); 829 830 xvdi_free_evtchn(vdp->xs_dip); 831 xvdi_unmap_ring(vdp->xs_ring); 832 } 833 834 /* 835 * xdb_params_change() initiates a allows change to the underlying device/file 836 * that the backend is accessing. It does this by disconnecting from the 837 * frontend, closing the old device, clearing a bunch of xenbus parameters, 838 * and switching back to the XenbusStateInitialising state. The frontend 839 * should notice this transition to the XenbusStateInitialising state and 840 * should attempt to reconnect to us (the backend). 841 */ 842 static void 843 xdb_params_change(xdb_t *vdp, char *params, boolean_t update_xs) 844 { 845 xenbus_transaction_t xbt; 846 dev_info_t *dip = vdp->xs_dip; 847 char *xsname; 848 int err; 849 850 ASSERT(MUTEX_HELD(&vdp->xs_cbmutex)); 851 ASSERT(vdp->xs_params_path != NULL); 852 853 if ((xsname = xvdi_get_xsname(dip)) == NULL) 854 return; 855 if (strcmp(vdp->xs_params_path, params) == 0) 856 return; 857 858 /* 859 * Close the device we're currently accessing and update the 860 * path which points to our backend device/file. 861 */ 862 xdb_close(dip); 863 vdp->xs_fe_initialised = B_FALSE; 864 865 trans_retry: 866 if ((err = xenbus_transaction_start(&xbt)) != 0) { 867 xvdi_dev_error(dip, err, "params change transaction init"); 868 goto errout; 869 } 870 871 /* 872 * Delete all the xenbus properties that are connection dependant 873 * and go back to the initializing state so that the frontend 874 * driver can re-negotiate a connection. 875 */ 876 if (((err = xenbus_rm(xbt, xsname, XBP_FB)) != 0) || 877 ((err = xenbus_rm(xbt, xsname, XBP_INFO)) != 0) || 878 ((err = xenbus_rm(xbt, xsname, "sector-size")) != 0) || 879 ((err = xenbus_rm(xbt, xsname, XBP_SECTORS)) != 0) || 880 ((err = xenbus_rm(xbt, xsname, "instance")) != 0) || 881 ((err = xenbus_rm(xbt, xsname, "node")) != 0) || 882 (update_xs && ((err = xenbus_printf(xbt, xsname, 883 "params", "%s", params)) != 0)) || 884 ((err = xvdi_switch_state(dip, 885 xbt, XenbusStateInitialising) > 0))) { 886 (void) xenbus_transaction_end(xbt, 1); 887 xvdi_dev_error(dip, err, "params change transaction setup"); 888 goto errout; 889 } 890 891 if ((err = xenbus_transaction_end(xbt, 0)) != 0) { 892 if (err == EAGAIN) { 893 /* transaction is ended, don't need to abort it */ 894 goto trans_retry; 895 } 896 xvdi_dev_error(dip, err, "params change transaction commit"); 897 goto errout; 898 } 899 900 /* Change the device that we plan to access */ 901 strfree(vdp->xs_params_path); 902 vdp->xs_params_path = strdup(params); 903 return; 904 905 errout: 906 (void) xvdi_switch_state(dip, xbt, XenbusStateInitialising); 907 } 908 909 /* 910 * xdb_watch_params_cb() - This callback is invoked whenever there 911 * is an update to the following xenbus parameter: 912 * /local/domain/0/backend/vbd/<domU_id>/<domU_dev>/params 913 * 914 * This normally happens during xm block-configure operations, which 915 * are used to change CD device images for HVM domUs. 916 */ 917 /*ARGSUSED*/ 918 static void 919 xdb_watch_params_cb(dev_info_t *dip, const char *path, void *arg) 920 { 921 xdb_t *vdp = (xdb_t *)ddi_get_driver_private(dip); 922 char *xsname, *oename, *str, *str2; 923 924 if (((xsname = xvdi_get_xsname(dip)) == NULL) || 925 ((oename = xvdi_get_oename(dip)) == NULL)) { 926 return; 927 } 928 929 mutex_enter(&vdp->xs_cbmutex); 930 931 if (xenbus_read_str(xsname, "params", &str) != 0) { 932 mutex_exit(&vdp->xs_cbmutex); 933 return; 934 } 935 936 if (strcmp(vdp->xs_params_path, str) == 0) { 937 /* Nothing todo */ 938 mutex_exit(&vdp->xs_cbmutex); 939 strfree(str); 940 return; 941 } 942 943 /* 944 * If the frontend isn't a cd device, doesn't support media 945 * requests, or has locked the media, then we can't change 946 * the params value. restore the current value. 947 */ 948 str2 = NULL; 949 if (!XDB_IS_FE_CD(vdp) || 950 (xenbus_read_str(oename, XBP_MEDIA_REQ, &str2) != 0) || 951 (strcmp(str2, XBV_MEDIA_REQ_LOCK) == 0)) { 952 if (str2 != NULL) 953 strfree(str2); 954 strfree(str); 955 956 str = i_pathname(dip); 957 cmn_err(CE_NOTE, 958 "!%s: media locked, ignoring params update", str); 959 strfree(str); 960 961 mutex_exit(&vdp->xs_cbmutex); 962 return; 963 } 964 965 XDB_DBPRINT(XDB_DBG_INFO, (CE_NOTE, 966 "block-configure params request: \"%s\"", str)); 967 968 xdb_params_change(vdp, str, B_FALSE); 969 mutex_exit(&vdp->xs_cbmutex); 970 strfree(str); 971 } 972 973 /* 974 * xdb_watch_media_req_cb() - This callback is invoked whenever there 975 * is an update to the following xenbus parameter: 976 * /local/domain/<domU_id>/device/vbd/<domU_dev>/media-req 977 * 978 * Media requests are only supported on CD devices and are issued by 979 * the frontend. Currently the only supported media request operaions 980 * are "lock" and "eject". A "lock" prevents the backend from changing 981 * the backing device/file (via xm block-configure). An "eject" requests 982 * tells the backend device that it should disconnect from the frontend 983 * and closing the backing device/file that is currently in use. 984 */ 985 /*ARGSUSED*/ 986 static void 987 xdb_watch_media_req_cb(dev_info_t *dip, const char *path, void *arg) 988 { 989 xdb_t *vdp = (xdb_t *)ddi_get_driver_private(dip); 990 char *oename, *str; 991 992 mutex_enter(&vdp->xs_cbmutex); 993 994 if ((oename = xvdi_get_oename(dip)) == NULL) { 995 mutex_exit(&vdp->xs_cbmutex); 996 return; 997 } 998 999 if (xenbus_read_str(oename, XBP_MEDIA_REQ, &str) != 0) { 1000 mutex_exit(&vdp->xs_cbmutex); 1001 return; 1002 } 1003 1004 if (!XDB_IS_FE_CD(vdp)) { 1005 xvdi_dev_error(dip, EINVAL, 1006 "media-req only supported for cdrom devices"); 1007 mutex_exit(&vdp->xs_cbmutex); 1008 return; 1009 } 1010 1011 if (strcmp(str, XBV_MEDIA_REQ_EJECT) != 0) { 1012 mutex_exit(&vdp->xs_cbmutex); 1013 strfree(str); 1014 return; 1015 } 1016 strfree(str); 1017 1018 XDB_DBPRINT(XDB_DBG_INFO, (CE_NOTE, "media eject request")); 1019 1020 xdb_params_change(vdp, "", B_TRUE); 1021 (void) xenbus_printf(XBT_NULL, oename, 1022 XBP_MEDIA_REQ, "%s", XBV_MEDIA_REQ_NONE); 1023 mutex_exit(&vdp->xs_cbmutex); 1024 } 1025 1026 /* 1027 * If we're dealing with a cdrom device, let the frontend know that 1028 * we support media requests via XBP_MEDIA_REQ_SUP, and setup a watch 1029 * to handle those frontend media request changes, which modify the 1030 * following xenstore parameter: 1031 * /local/domain/<domU_id>/device/vbd/<domU_dev>/media-req 1032 */ 1033 static boolean_t 1034 xdb_media_req_init(xdb_t *vdp) 1035 { 1036 dev_info_t *dip = vdp->xs_dip; 1037 char *xsname, *oename; 1038 1039 ASSERT(MUTEX_HELD(&vdp->xs_cbmutex)); 1040 1041 if (((xsname = xvdi_get_xsname(dip)) == NULL) || 1042 ((oename = xvdi_get_oename(dip)) == NULL)) 1043 return (B_FALSE); 1044 1045 if (!XDB_IS_FE_CD(vdp)) 1046 return (B_TRUE); 1047 1048 if (xenbus_printf(XBT_NULL, xsname, XBP_MEDIA_REQ_SUP, "%d", 1) != 0) 1049 return (B_FALSE); 1050 1051 if (xvdi_add_xb_watch_handler(dip, oename, 1052 XBP_MEDIA_REQ, xdb_watch_media_req_cb, NULL) != DDI_SUCCESS) { 1053 xvdi_dev_error(dip, EAGAIN, 1054 "Failed to register watch for cdrom media requests"); 1055 return (B_FALSE); 1056 } 1057 1058 return (B_TRUE); 1059 } 1060 1061 /* 1062 * Get our params value. Also, if we're using "params" then setup a 1063 * watch to handle xm block-configure operations which modify the 1064 * following xenstore parameter: 1065 * /local/domain/0/backend/vbd/<domU_id>/<domU_dev>/params 1066 */ 1067 static boolean_t 1068 xdb_params_init(xdb_t *vdp) 1069 { 1070 dev_info_t *dip = vdp->xs_dip; 1071 char *str, *xsname; 1072 int err, watch_params = B_FALSE; 1073 1074 ASSERT(MUTEX_HELD(&vdp->xs_cbmutex)); 1075 ASSERT(vdp->xs_params_path == NULL); 1076 1077 if ((xsname = xvdi_get_xsname(dip)) == NULL) 1078 return (B_FALSE); 1079 1080 if ((err = xenbus_read_str(xsname, 1081 "dynamic-device-path", &str)) == ENOENT) { 1082 err = xenbus_read_str(xsname, "params", &str); 1083 watch_params = B_TRUE; 1084 } 1085 if (err != 0) 1086 return (B_FALSE); 1087 vdp->xs_params_path = str; 1088 1089 /* 1090 * If we got our backing store path from "dynamic-device-path" then 1091 * there's no reason to watch "params" 1092 */ 1093 if (!watch_params) 1094 return (B_TRUE); 1095 1096 if (xvdi_add_xb_watch_handler(dip, xsname, "params", 1097 xdb_watch_params_cb, NULL) != DDI_SUCCESS) { 1098 strfree(vdp->xs_params_path); 1099 vdp->xs_params_path = NULL; 1100 return (B_FALSE); 1101 } 1102 1103 return (B_TRUE); 1104 } 1105 1106 #define LOFI_CTRL_NODE "/dev/lofictl" 1107 #define LOFI_DEV_NODE "/devices/pseudo/lofi@0:" 1108 #define LOFI_MODE (FREAD | FWRITE | FEXCL) 1109 1110 static int 1111 xdb_setup_node(xdb_t *vdp, char *path) 1112 { 1113 dev_info_t *dip = vdp->xs_dip; 1114 char *xsname, *str; 1115 ldi_handle_t ldi_hdl; 1116 struct lofi_ioctl *li; 1117 int minor, err; 1118 1119 ASSERT(MUTEX_HELD(&vdp->xs_cbmutex)); 1120 1121 if ((xsname = xvdi_get_xsname(dip)) == NULL) 1122 return (DDI_FAILURE); 1123 1124 if ((err = xenbus_read_str(xsname, "type", &str)) != 0) { 1125 xvdi_dev_error(dip, err, "Getting type from backend device"); 1126 return (DDI_FAILURE); 1127 } 1128 if (strcmp(str, "file") == 0) 1129 vdp->xs_type |= XDB_DEV_BE_LOFI; 1130 strfree(str); 1131 1132 if (!XDB_IS_BE_LOFI(vdp)) { 1133 (void) strlcpy(path, vdp->xs_params_path, MAXPATHLEN); 1134 ASSERT(vdp->xs_lofi_path == NULL); 1135 return (DDI_SUCCESS); 1136 } 1137 1138 do { 1139 err = ldi_open_by_name(LOFI_CTRL_NODE, LOFI_MODE, kcred, 1140 &ldi_hdl, vdp->xs_ldi_li); 1141 } while (err == EBUSY); 1142 if (err != 0) { 1143 return (DDI_FAILURE); 1144 } 1145 1146 li = kmem_zalloc(sizeof (*li), KM_SLEEP); 1147 (void) strlcpy(li->li_filename, vdp->xs_params_path, 1148 sizeof (li->li_filename)); 1149 err = ldi_ioctl(ldi_hdl, LOFI_MAP_FILE, (intptr_t)li, 1150 LOFI_MODE | FKIOCTL, kcred, &minor); 1151 (void) ldi_close(ldi_hdl, LOFI_MODE, kcred); 1152 kmem_free(li, sizeof (*li)); 1153 1154 if (err != 0) { 1155 cmn_err(CE_WARN, "xdb@%s: Failed to create lofi dev for %s", 1156 ddi_get_name_addr(dip), vdp->xs_params_path); 1157 return (DDI_FAILURE); 1158 } 1159 1160 /* 1161 * return '/devices/...' instead of '/dev/lofi/...' since the 1162 * former is available immediately after calling ldi_ioctl 1163 */ 1164 (void) snprintf(path, MAXPATHLEN, LOFI_DEV_NODE "%d", minor); 1165 (void) xenbus_printf(XBT_NULL, xsname, "node", "%s", path); 1166 1167 ASSERT(vdp->xs_lofi_path == NULL); 1168 vdp->xs_lofi_path = strdup(path); 1169 1170 return (DDI_SUCCESS); 1171 } 1172 1173 static void 1174 xdb_teardown_node(xdb_t *vdp) 1175 { 1176 dev_info_t *dip = vdp->xs_dip; 1177 ldi_handle_t ldi_hdl; 1178 struct lofi_ioctl *li; 1179 int err; 1180 1181 ASSERT(MUTEX_HELD(&vdp->xs_cbmutex)); 1182 1183 if (!XDB_IS_BE_LOFI(vdp)) 1184 return; 1185 1186 vdp->xs_type &= ~XDB_DEV_BE_LOFI; 1187 ASSERT(vdp->xs_lofi_path != NULL); 1188 1189 li = kmem_zalloc(sizeof (*li), KM_SLEEP); 1190 (void) strlcpy(li->li_filename, vdp->xs_params_path, 1191 sizeof (li->li_filename)); 1192 1193 do { 1194 err = ldi_open_by_name(LOFI_CTRL_NODE, LOFI_MODE, kcred, 1195 &ldi_hdl, vdp->xs_ldi_li); 1196 } while (err == EBUSY); 1197 1198 if (err != 0) { 1199 kmem_free(li, sizeof (*li)); 1200 return; 1201 } 1202 1203 if (ldi_ioctl(ldi_hdl, LOFI_UNMAP_FILE, (intptr_t)li, 1204 LOFI_MODE | FKIOCTL, kcred, NULL) != 0) { 1205 cmn_err(CE_WARN, "xdb@%s: Failed to delete lofi dev for %s", 1206 ddi_get_name_addr(dip), li->li_filename); 1207 } 1208 1209 (void) ldi_close(ldi_hdl, LOFI_MODE, kcred); 1210 kmem_free(li, sizeof (*li)); 1211 1212 strfree(vdp->xs_lofi_path); 1213 vdp->xs_lofi_path = NULL; 1214 } 1215 1216 static int 1217 xdb_open_device(xdb_t *vdp) 1218 { 1219 dev_info_t *dip = vdp->xs_dip; 1220 uint64_t devsize; 1221 int blksize; 1222 char *nodepath; 1223 1224 ASSERT(MUTEX_HELD(&vdp->xs_cbmutex)); 1225 1226 if (strlen(vdp->xs_params_path) == 0) { 1227 /* 1228 * it's possible to have no backing device when dealing 1229 * with a pv cdrom drive that has no virtual cd associated 1230 * with it. 1231 */ 1232 ASSERT(XDB_IS_FE_CD(vdp)); 1233 ASSERT(vdp->xs_sectors == 0); 1234 ASSERT(vdp->xs_ldi_li == NULL); 1235 ASSERT(vdp->xs_ldi_hdl == NULL); 1236 return (DDI_SUCCESS); 1237 } 1238 1239 if (ldi_ident_from_dip(dip, &vdp->xs_ldi_li) != 0) 1240 return (DDI_FAILURE); 1241 1242 nodepath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 1243 1244 /* try to open backend device */ 1245 if (xdb_setup_node(vdp, nodepath) != DDI_SUCCESS) { 1246 xvdi_dev_error(dip, ENXIO, 1247 "Getting device path of backend device"); 1248 ldi_ident_release(vdp->xs_ldi_li); 1249 kmem_free(nodepath, MAXPATHLEN); 1250 return (DDI_FAILURE); 1251 } 1252 1253 if (ldi_open_by_name(nodepath, 1254 FREAD | (XDB_IS_RO(vdp) ? 0 : FWRITE), 1255 kcred, &vdp->xs_ldi_hdl, vdp->xs_ldi_li) != 0) { 1256 xdb_teardown_node(vdp); 1257 ldi_ident_release(vdp->xs_ldi_li); 1258 cmn_err(CE_WARN, "xdb@%s: Failed to open: %s", 1259 ddi_get_name_addr(dip), nodepath); 1260 kmem_free(nodepath, MAXPATHLEN); 1261 return (DDI_FAILURE); 1262 } 1263 1264 if (ldi_get_size(vdp->xs_ldi_hdl, &devsize) != DDI_SUCCESS) { 1265 (void) ldi_close(vdp->xs_ldi_hdl, 1266 FREAD | (XDB_IS_RO(vdp) ? 0 : FWRITE), kcred); 1267 xdb_teardown_node(vdp); 1268 ldi_ident_release(vdp->xs_ldi_li); 1269 kmem_free(nodepath, MAXPATHLEN); 1270 return (DDI_FAILURE); 1271 } 1272 1273 blksize = ldi_prop_get_int64(vdp->xs_ldi_hdl, 1274 DDI_PROP_DONTPASS | DDI_PROP_NOTPROM, 1275 "blksize", DEV_BSIZE); 1276 if (blksize == DEV_BSIZE) 1277 blksize = ldi_prop_get_int(vdp->xs_ldi_hdl, 1278 LDI_DEV_T_ANY | DDI_PROP_DONTPASS | 1279 DDI_PROP_NOTPROM, "device-blksize", DEV_BSIZE); 1280 1281 vdp->xs_sec_size = blksize; 1282 vdp->xs_sectors = devsize / blksize; 1283 1284 /* check if the underlying device is a CD/DVD disc */ 1285 if (ldi_prop_get_int(vdp->xs_ldi_hdl, LDI_DEV_T_ANY | DDI_PROP_DONTPASS, 1286 INQUIRY_DEVICE_TYPE, DTYPE_DIRECT) == DTYPE_RODIRECT) 1287 vdp->xs_type |= XDB_DEV_BE_CD; 1288 1289 /* check if the underlying device is a removable disk */ 1290 if (ldi_prop_exists(vdp->xs_ldi_hdl, 1291 LDI_DEV_T_ANY | DDI_PROP_DONTPASS | DDI_PROP_NOTPROM, 1292 "removable-media")) 1293 vdp->xs_type |= XDB_DEV_BE_RMB; 1294 1295 kmem_free(nodepath, MAXPATHLEN); 1296 return (DDI_SUCCESS); 1297 } 1298 1299 static void 1300 xdb_close_device(xdb_t *vdp) 1301 { 1302 ASSERT(MUTEX_HELD(&vdp->xs_cbmutex)); 1303 1304 if (strlen(vdp->xs_params_path) == 0) { 1305 ASSERT(XDB_IS_FE_CD(vdp)); 1306 ASSERT(vdp->xs_sectors == 0); 1307 ASSERT(vdp->xs_ldi_li == NULL); 1308 ASSERT(vdp->xs_ldi_hdl == NULL); 1309 return; 1310 } 1311 1312 (void) ldi_close(vdp->xs_ldi_hdl, 1313 FREAD | (XDB_IS_RO(vdp) ? 0 : FWRITE), kcred); 1314 xdb_teardown_node(vdp); 1315 ldi_ident_release(vdp->xs_ldi_li); 1316 vdp->xs_type &= ~(XDB_DEV_BE_CD | XDB_DEV_BE_RMB); 1317 vdp->xs_sectors = 0; 1318 vdp->xs_ldi_li = NULL; 1319 vdp->xs_ldi_hdl = NULL; 1320 } 1321 1322 /* 1323 * Kick-off connect process 1324 * If xs_fe_initialised == B_TRUE and xs_hp_connected == B_TRUE 1325 * the xs_if_connected will be changed to B_TRUE on success, 1326 */ 1327 static void 1328 xdb_start_connect(xdb_t *vdp) 1329 { 1330 xenbus_transaction_t xbt; 1331 dev_info_t *dip = vdp->xs_dip; 1332 boolean_t fb_exists; 1333 int err, instance = ddi_get_instance(dip); 1334 uint64_t sectors; 1335 uint_t dinfo, ssize; 1336 char *xsname; 1337 1338 ASSERT(MUTEX_HELD(&vdp->xs_cbmutex)); 1339 1340 if (((xsname = xvdi_get_xsname(dip)) == NULL) || 1341 ((vdp->xs_peer = xvdi_get_oeid(dip)) == (domid_t)-1)) 1342 return; 1343 1344 mutex_enter(&vdp->xs_iomutex); 1345 /* 1346 * if the hotplug scripts haven't run or if the frontend is not 1347 * initialized, then we can't try to connect. 1348 */ 1349 if (!vdp->xs_hp_connected || !vdp->xs_fe_initialised) { 1350 ASSERT(!vdp->xs_if_connected); 1351 mutex_exit(&vdp->xs_iomutex); 1352 return; 1353 } 1354 1355 /* If we're already connected then there's nothing todo */ 1356 if (vdp->xs_if_connected) { 1357 mutex_exit(&vdp->xs_iomutex); 1358 return; 1359 } 1360 mutex_exit(&vdp->xs_iomutex); 1361 1362 /* 1363 * Start connect to frontend only when backend device are ready 1364 * and frontend has moved to XenbusStateInitialised, which means 1365 * ready to connect. 1366 */ 1367 XDB_DBPRINT(XDB_DBG_INFO, (CE_NOTE, 1368 "xdb@%s: starting connection process", ddi_get_name_addr(dip))); 1369 1370 if (xdb_open_device(vdp) != DDI_SUCCESS) 1371 return; 1372 1373 if (xdb_bindto_frontend(vdp) != DDI_SUCCESS) { 1374 xdb_close_device(vdp); 1375 return; 1376 } 1377 1378 /* init i/o requests */ 1379 xdb_init_ioreqs(vdp); 1380 1381 if (ddi_add_intr(dip, 0, NULL, NULL, xdb_intr, (caddr_t)vdp) 1382 != DDI_SUCCESS) { 1383 xdb_uninit_ioreqs(vdp); 1384 xdb_unbindfrom_frontend(vdp); 1385 xdb_close_device(vdp); 1386 return; 1387 } 1388 1389 dinfo = 0; 1390 if (XDB_IS_RO(vdp)) 1391 dinfo |= VDISK_READONLY; 1392 if (XDB_IS_BE_RMB(vdp)) 1393 dinfo |= VDISK_REMOVABLE; 1394 if (XDB_IS_BE_CD(vdp)) 1395 dinfo |= VDISK_CDROM; 1396 if (XDB_IS_FE_CD(vdp)) 1397 dinfo |= VDISK_REMOVABLE | VDISK_CDROM; 1398 1399 /* 1400 * we can recieve intr any time from now on 1401 * mark that we're ready to take intr 1402 */ 1403 mutex_enter(&vdp->xs_iomutex); 1404 ASSERT(vdp->xs_fe_initialised); 1405 vdp->xs_if_connected = B_TRUE; 1406 mutex_exit(&vdp->xs_iomutex); 1407 1408 trans_retry: 1409 /* write into xenstore the info needed by frontend */ 1410 if ((err = xenbus_transaction_start(&xbt)) != 0) { 1411 xvdi_dev_error(dip, err, "connect transaction init"); 1412 goto errout; 1413 } 1414 1415 /* If feature-barrier isn't present in xenstore, add it. */ 1416 fb_exists = xenbus_exists(xsname, XBP_FB); 1417 1418 ssize = (vdp->xs_sec_size == 0) ? DEV_BSIZE : vdp->xs_sec_size; 1419 sectors = vdp->xs_sectors; 1420 if (((!fb_exists && 1421 (err = xenbus_printf(xbt, xsname, XBP_FB, "%d", 1)))) || 1422 (err = xenbus_printf(xbt, xsname, XBP_INFO, "%u", dinfo)) || 1423 (err = xenbus_printf(xbt, xsname, XBP_SECTOR_SIZE, "%u", ssize)) || 1424 (err = xenbus_printf(xbt, xsname, 1425 XBP_SECTORS, "%"PRIu64, sectors)) || 1426 (err = xenbus_printf(xbt, xsname, "instance", "%d", instance)) || 1427 ((err = xvdi_switch_state(dip, xbt, XenbusStateConnected)) > 0)) { 1428 (void) xenbus_transaction_end(xbt, 1); 1429 xvdi_dev_error(dip, err, "connect transaction setup"); 1430 goto errout; 1431 } 1432 1433 if ((err = xenbus_transaction_end(xbt, 0)) != 0) { 1434 if (err == EAGAIN) { 1435 /* transaction is ended, don't need to abort it */ 1436 goto trans_retry; 1437 } 1438 xvdi_dev_error(dip, err, "connect transaction commit"); 1439 goto errout; 1440 } 1441 1442 return; 1443 1444 errout: 1445 xdb_close(dip); 1446 } 1447 1448 /* 1449 * Disconnect from frontend and close backend device 1450 */ 1451 static void 1452 xdb_close(dev_info_t *dip) 1453 { 1454 xdb_t *vdp = (xdb_t *)ddi_get_driver_private(dip); 1455 1456 ASSERT(MUTEX_HELD(&vdp->xs_cbmutex)); 1457 mutex_enter(&vdp->xs_iomutex); 1458 1459 /* 1460 * if the hotplug scripts haven't run or if the frontend is not 1461 * initialized, then we can't be connected, so there's no 1462 * connection to close. 1463 */ 1464 if (!vdp->xs_hp_connected || !vdp->xs_fe_initialised) { 1465 ASSERT(!vdp->xs_if_connected); 1466 mutex_exit(&vdp->xs_iomutex); 1467 return; 1468 } 1469 1470 /* if we're not connected, there's nothing to do */ 1471 if (!vdp->xs_if_connected) { 1472 cv_broadcast(&vdp->xs_iocv); 1473 mutex_exit(&vdp->xs_iomutex); 1474 return; 1475 } 1476 1477 XDB_DBPRINT(XDB_DBG_INFO, (CE_NOTE, "closing while connected")); 1478 1479 vdp->xs_if_connected = B_FALSE; 1480 cv_broadcast(&vdp->xs_iocv); 1481 1482 mutex_exit(&vdp->xs_iomutex); 1483 1484 /* stop accepting I/O request from frontend */ 1485 ddi_remove_intr(dip, 0, NULL); 1486 1487 /* clear all on-going I/Os, if any */ 1488 mutex_enter(&vdp->xs_iomutex); 1489 while (vdp->xs_ionum > 0) 1490 cv_wait(&vdp->xs_ionumcv, &vdp->xs_iomutex); 1491 mutex_exit(&vdp->xs_iomutex); 1492 1493 /* clean up resources and close this interface */ 1494 xdb_uninit_ioreqs(vdp); 1495 xdb_unbindfrom_frontend(vdp); 1496 xdb_close_device(vdp); 1497 vdp->xs_peer = (domid_t)-1; 1498 } 1499 1500 static void 1501 xdb_send_buf(void *arg) 1502 { 1503 xdb_t *vdp = (xdb_t *)arg; 1504 buf_t *bp; 1505 int err; 1506 1507 mutex_enter(&vdp->xs_iomutex); 1508 while (vdp->xs_send_buf) { 1509 if ((bp = vdp->xs_f_iobuf) == NULL) { 1510 /* wait for some io to send */ 1511 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, 1512 "send buf waiting for io")); 1513 cv_wait(&vdp->xs_iocv, &vdp->xs_iomutex); 1514 continue; 1515 } 1516 1517 vdp->xs_f_iobuf = bp->av_forw; 1518 bp->av_forw = NULL; 1519 vdp->xs_ionum++; 1520 1521 mutex_exit(&vdp->xs_iomutex); 1522 if (bp->b_bcount == 0) { 1523 /* no I/O needs to be done */ 1524 (void) xdb_biodone(bp); 1525 mutex_enter(&vdp->xs_iomutex); 1526 continue; 1527 } 1528 1529 err = EIO; 1530 if (vdp->xs_ldi_hdl != NULL) 1531 err = ldi_strategy(vdp->xs_ldi_hdl, bp); 1532 if (err != 0) { 1533 bp->b_flags |= B_ERROR; 1534 (void) xdb_biodone(bp); 1535 XDB_DBPRINT(XDB_DBG_IO, (CE_WARN, 1536 "xdb@%s: sent buf to backend devfailed, err=%d", 1537 ddi_get_name_addr(vdp->xs_dip), err)); 1538 } else { 1539 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, 1540 "sent buf to backend ok")); 1541 } 1542 mutex_enter(&vdp->xs_iomutex); 1543 } 1544 XDB_DBPRINT(XDB_DBG_IO, (CE_NOTE, "send buf finishing")); 1545 mutex_exit(&vdp->xs_iomutex); 1546 } 1547 1548 /*ARGSUSED*/ 1549 static void 1550 xdb_hp_state_change(dev_info_t *dip, ddi_eventcookie_t id, void *arg, 1551 void *impl_data) 1552 { 1553 xendev_hotplug_state_t state = *(xendev_hotplug_state_t *)impl_data; 1554 xdb_t *vdp = (xdb_t *)ddi_get_driver_private(dip); 1555 1556 XDB_DBPRINT(XDB_DBG_INFO, (CE_NOTE, "xdb@%s: " 1557 "hotplug status change to %d!", ddi_get_name_addr(dip), state)); 1558 1559 if (state != Connected) 1560 return; 1561 1562 mutex_enter(&vdp->xs_cbmutex); 1563 1564 /* If hotplug script have already run, there's nothing todo */ 1565 if (vdp->xs_hp_connected) { 1566 mutex_exit(&vdp->xs_cbmutex); 1567 return; 1568 } 1569 1570 vdp->xs_hp_connected = B_TRUE; 1571 xdb_start_connect(vdp); 1572 mutex_exit(&vdp->xs_cbmutex); 1573 } 1574 1575 /*ARGSUSED*/ 1576 static void 1577 xdb_oe_state_change(dev_info_t *dip, ddi_eventcookie_t id, void *arg, 1578 void *impl_data) 1579 { 1580 XenbusState new_state = *(XenbusState *)impl_data; 1581 xdb_t *vdp = (xdb_t *)ddi_get_driver_private(dip); 1582 1583 XDB_DBPRINT(XDB_DBG_INFO, (CE_NOTE, "xdb@%s: " 1584 "otherend state change to %d!", ddi_get_name_addr(dip), new_state)); 1585 1586 mutex_enter(&vdp->xs_cbmutex); 1587 1588 /* 1589 * Now it'd really be nice if there was a well defined state 1590 * transition model for xen frontend drivers, but unfortunatly 1591 * there isn't. So we're stuck with assuming that all state 1592 * transitions are possible, and we'll just have to deal with 1593 * them regardless of what state we're in. 1594 */ 1595 switch (new_state) { 1596 case XenbusStateUnknown: 1597 case XenbusStateInitialising: 1598 case XenbusStateInitWait: 1599 /* tear down our connection to the frontend */ 1600 xdb_close(dip); 1601 vdp->xs_fe_initialised = B_FALSE; 1602 break; 1603 1604 case XenbusStateInitialised: 1605 /* 1606 * If we were conected, then we need to drop the connection 1607 * and re-negotiate it. 1608 */ 1609 xdb_close(dip); 1610 vdp->xs_fe_initialised = B_TRUE; 1611 xdb_start_connect(vdp); 1612 break; 1613 1614 case XenbusStateConnected: 1615 /* nothing todo here other than congratulate the frontend */ 1616 break; 1617 1618 case XenbusStateClosing: 1619 /* monkey see monkey do */ 1620 (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateClosing); 1621 break; 1622 1623 case XenbusStateClosed: 1624 /* tear down our connection to the frontend */ 1625 xdb_close(dip); 1626 vdp->xs_fe_initialised = B_FALSE; 1627 (void) xvdi_switch_state(dip, XBT_NULL, new_state); 1628 break; 1629 } 1630 1631 mutex_exit(&vdp->xs_cbmutex); 1632 } 1633 1634 static int 1635 xdb_attach(dev_info_t *dip, ddi_attach_cmd_t cmd) 1636 { 1637 ddi_iblock_cookie_t ibc; 1638 xdb_t *vdp; 1639 int instance = ddi_get_instance(dip); 1640 char *xsname, *oename; 1641 char *str; 1642 1643 switch (cmd) { 1644 case DDI_RESUME: 1645 return (DDI_FAILURE); 1646 case DDI_ATTACH: 1647 break; 1648 default: 1649 return (DDI_FAILURE); 1650 } 1651 /* DDI_ATTACH */ 1652 1653 if (((xsname = xvdi_get_xsname(dip)) == NULL) || 1654 ((oename = xvdi_get_oename(dip)) == NULL)) 1655 return (DDI_FAILURE); 1656 1657 /* 1658 * Disable auto-detach. This is necessary so that we don't get 1659 * detached while we're disconnected from the front end. 1660 */ 1661 (void) ddi_prop_update_int(DDI_DEV_T_NONE, dip, DDI_NO_AUTODETACH, 1); 1662 1663 if (ddi_get_iblock_cookie(dip, 0, &ibc) != DDI_SUCCESS) 1664 return (DDI_FAILURE); 1665 1666 if (ddi_soft_state_zalloc(xdb_statep, instance) != DDI_SUCCESS) 1667 return (DDI_FAILURE); 1668 1669 vdp = ddi_get_soft_state(xdb_statep, instance); 1670 vdp->xs_dip = dip; 1671 mutex_init(&vdp->xs_iomutex, NULL, MUTEX_DRIVER, (void *)ibc); 1672 mutex_init(&vdp->xs_cbmutex, NULL, MUTEX_DRIVER, (void *)ibc); 1673 cv_init(&vdp->xs_iocv, NULL, CV_DRIVER, NULL); 1674 cv_init(&vdp->xs_ionumcv, NULL, CV_DRIVER, NULL); 1675 ddi_set_driver_private(dip, vdp); 1676 1677 if (!xdb_kstat_init(vdp)) 1678 goto errout1; 1679 1680 /* Check if the frontend device is supposed to be a cdrom */ 1681 if (xenbus_read_str(oename, XBP_DEV_TYPE, &str) != 0) 1682 return (DDI_FAILURE); 1683 if (strcmp(str, XBV_DEV_TYPE_CD) == 0) 1684 vdp->xs_type |= XDB_DEV_FE_CD; 1685 strfree(str); 1686 1687 /* Check if the frontend device is supposed to be read only */ 1688 if (xenbus_read_str(xsname, "mode", &str) != 0) 1689 return (DDI_FAILURE); 1690 if ((strcmp(str, "r") == NULL) || (strcmp(str, "ro") == NULL)) 1691 vdp->xs_type |= XDB_DEV_RO; 1692 strfree(str); 1693 1694 mutex_enter(&vdp->xs_cbmutex); 1695 if (!xdb_media_req_init(vdp) || !xdb_params_init(vdp)) { 1696 xvdi_remove_xb_watch_handlers(dip); 1697 mutex_exit(&vdp->xs_cbmutex); 1698 goto errout2; 1699 } 1700 mutex_exit(&vdp->xs_cbmutex); 1701 1702 vdp->xs_send_buf = B_TRUE; 1703 vdp->xs_iotaskq = ddi_taskq_create(dip, "xdb_iotask", 1, 1704 TASKQ_DEFAULTPRI, 0); 1705 (void) ddi_taskq_dispatch(vdp->xs_iotaskq, xdb_send_buf, vdp, 1706 DDI_SLEEP); 1707 1708 /* Watch frontend and hotplug state change */ 1709 if ((xvdi_add_event_handler(dip, XS_OE_STATE, xdb_oe_state_change, 1710 NULL) != DDI_SUCCESS) || 1711 (xvdi_add_event_handler(dip, XS_HP_STATE, xdb_hp_state_change, 1712 NULL) != DDI_SUCCESS)) 1713 goto errout3; 1714 1715 /* 1716 * Kick-off hotplug script 1717 */ 1718 if (xvdi_post_event(dip, XEN_HP_ADD) != DDI_SUCCESS) { 1719 cmn_err(CE_WARN, "xdb@%s: failed to start hotplug script", 1720 ddi_get_name_addr(dip)); 1721 goto errout3; 1722 } 1723 1724 /* 1725 * start waiting for hotplug event and otherend state event 1726 * mainly for debugging, frontend will not take any op seeing this 1727 */ 1728 (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateInitWait); 1729 1730 XDB_DBPRINT(XDB_DBG_INFO, (CE_NOTE, "xdb@%s: attached!", 1731 ddi_get_name_addr(dip))); 1732 return (DDI_SUCCESS); 1733 1734 errout3: 1735 ASSERT(vdp->xs_hp_connected && vdp->xs_if_connected); 1736 1737 xvdi_remove_event_handler(dip, NULL); 1738 1739 /* Disconnect from the backend */ 1740 mutex_enter(&vdp->xs_cbmutex); 1741 mutex_enter(&vdp->xs_iomutex); 1742 vdp->xs_send_buf = B_FALSE; 1743 cv_broadcast(&vdp->xs_iocv); 1744 mutex_exit(&vdp->xs_iomutex); 1745 mutex_exit(&vdp->xs_cbmutex); 1746 1747 /* wait for all io to dtrain and destroy io taskq */ 1748 ddi_taskq_destroy(vdp->xs_iotaskq); 1749 1750 /* tear down block-configure watch */ 1751 mutex_enter(&vdp->xs_cbmutex); 1752 xvdi_remove_xb_watch_handlers(dip); 1753 mutex_exit(&vdp->xs_cbmutex); 1754 1755 errout2: 1756 /* remove kstats */ 1757 kstat_delete(vdp->xs_kstats); 1758 1759 errout1: 1760 /* free up driver state */ 1761 ddi_set_driver_private(dip, NULL); 1762 cv_destroy(&vdp->xs_iocv); 1763 cv_destroy(&vdp->xs_ionumcv); 1764 mutex_destroy(&vdp->xs_cbmutex); 1765 mutex_destroy(&vdp->xs_iomutex); 1766 ddi_soft_state_free(xdb_statep, instance); 1767 1768 return (DDI_FAILURE); 1769 } 1770 1771 /*ARGSUSED*/ 1772 static int 1773 xdb_detach(dev_info_t *dip, ddi_detach_cmd_t cmd) 1774 { 1775 int instance = ddi_get_instance(dip); 1776 xdb_t *vdp = XDB_INST2SOFTS(instance); 1777 1778 switch (cmd) { 1779 case DDI_SUSPEND: 1780 return (DDI_FAILURE); 1781 case DDI_DETACH: 1782 break; 1783 default: 1784 return (DDI_FAILURE); 1785 } 1786 1787 /* DDI_DETACH handling */ 1788 1789 /* refuse to detach if we're still in use by the frontend */ 1790 mutex_enter(&vdp->xs_iomutex); 1791 if (vdp->xs_if_connected) { 1792 mutex_exit(&vdp->xs_iomutex); 1793 return (DDI_FAILURE); 1794 } 1795 vdp->xs_send_buf = B_FALSE; 1796 cv_broadcast(&vdp->xs_iocv); 1797 mutex_exit(&vdp->xs_iomutex); 1798 1799 xvdi_remove_event_handler(dip, NULL); 1800 (void) xvdi_post_event(dip, XEN_HP_REMOVE); 1801 1802 ddi_taskq_destroy(vdp->xs_iotaskq); 1803 1804 mutex_enter(&vdp->xs_cbmutex); 1805 xvdi_remove_xb_watch_handlers(dip); 1806 mutex_exit(&vdp->xs_cbmutex); 1807 1808 cv_destroy(&vdp->xs_iocv); 1809 cv_destroy(&vdp->xs_ionumcv); 1810 mutex_destroy(&vdp->xs_cbmutex); 1811 mutex_destroy(&vdp->xs_iomutex); 1812 kstat_delete(vdp->xs_kstats); 1813 ddi_set_driver_private(dip, NULL); 1814 ddi_soft_state_free(xdb_statep, instance); 1815 1816 XDB_DBPRINT(XDB_DBG_INFO, (CE_NOTE, "xdb@%s: detached!", 1817 ddi_get_name_addr(dip))); 1818 return (DDI_SUCCESS); 1819 } 1820 1821 static struct dev_ops xdb_dev_ops = { 1822 DEVO_REV, /* devo_rev */ 1823 0, /* devo_refcnt */ 1824 ddi_getinfo_1to1, /* devo_getinfo */ 1825 nulldev, /* devo_identify */ 1826 nulldev, /* devo_probe */ 1827 xdb_attach, /* devo_attach */ 1828 xdb_detach, /* devo_detach */ 1829 nodev, /* devo_reset */ 1830 NULL, /* devo_cb_ops */ 1831 NULL, /* devo_bus_ops */ 1832 NULL, /* power */ 1833 ddi_quiesce_not_needed, /* quiesce */ 1834 }; 1835 1836 /* 1837 * Module linkage information for the kernel. 1838 */ 1839 static struct modldrv modldrv = { 1840 &mod_driverops, /* Type of module. */ 1841 "vbd backend driver", /* Name of the module */ 1842 &xdb_dev_ops /* driver ops */ 1843 }; 1844 1845 static struct modlinkage xdb_modlinkage = { 1846 MODREV_1, 1847 &modldrv, 1848 NULL 1849 }; 1850 1851 int 1852 _init(void) 1853 { 1854 int rv; 1855 1856 if ((rv = ddi_soft_state_init((void **)&xdb_statep, 1857 sizeof (xdb_t), 0)) == 0) 1858 if ((rv = mod_install(&xdb_modlinkage)) != 0) 1859 ddi_soft_state_fini((void **)&xdb_statep); 1860 return (rv); 1861 } 1862 1863 int 1864 _fini(void) 1865 { 1866 int rv; 1867 1868 if ((rv = mod_remove(&xdb_modlinkage)) != 0) 1869 return (rv); 1870 ddi_soft_state_fini((void **)&xdb_statep); 1871 return (rv); 1872 } 1873 1874 int 1875 _info(struct modinfo *modinfop) 1876 { 1877 return (mod_info(&xdb_modlinkage, modinfop)); 1878 } 1879 1880 static int 1881 xdb_get_request(xdb_t *vdp, blkif_request_t *req) 1882 { 1883 void *src = xvdi_ring_get_request(vdp->xs_ring); 1884 1885 if (src == NULL) 1886 return (0); 1887 1888 switch (vdp->xs_blk_protocol) { 1889 case BLKIF_PROTOCOL_NATIVE: 1890 (void) memcpy(req, src, sizeof (*req)); 1891 break; 1892 case BLKIF_PROTOCOL_X86_32: 1893 blkif_get_x86_32_req(req, src); 1894 break; 1895 case BLKIF_PROTOCOL_X86_64: 1896 blkif_get_x86_64_req(req, src); 1897 break; 1898 default: 1899 cmn_err(CE_PANIC, "xdb@%s: unrecognised protocol: %d", 1900 ddi_get_name_addr(vdp->xs_dip), 1901 vdp->xs_blk_protocol); 1902 } 1903 return (1); 1904 } 1905 1906 static int 1907 xdb_push_response(xdb_t *vdp, uint64_t id, uint8_t op, uint16_t status) 1908 { 1909 ddi_acc_handle_t acchdl = vdp->xs_ring_hdl; 1910 blkif_response_t *rsp = xvdi_ring_get_response(vdp->xs_ring); 1911 blkif_x86_32_response_t *rsp_32 = (blkif_x86_32_response_t *)rsp; 1912 blkif_x86_64_response_t *rsp_64 = (blkif_x86_64_response_t *)rsp; 1913 1914 ASSERT(rsp); 1915 1916 switch (vdp->xs_blk_protocol) { 1917 case BLKIF_PROTOCOL_NATIVE: 1918 ddi_put64(acchdl, &rsp->id, id); 1919 ddi_put8(acchdl, &rsp->operation, op); 1920 ddi_put16(acchdl, (uint16_t *)&rsp->status, 1921 status == 0 ? BLKIF_RSP_OKAY : BLKIF_RSP_ERROR); 1922 break; 1923 case BLKIF_PROTOCOL_X86_32: 1924 ddi_put64(acchdl, &rsp_32->id, id); 1925 ddi_put8(acchdl, &rsp_32->operation, op); 1926 ddi_put16(acchdl, (uint16_t *)&rsp_32->status, 1927 status == 0 ? BLKIF_RSP_OKAY : BLKIF_RSP_ERROR); 1928 break; 1929 case BLKIF_PROTOCOL_X86_64: 1930 ddi_put64(acchdl, &rsp_64->id, id); 1931 ddi_put8(acchdl, &rsp_64->operation, op); 1932 ddi_put16(acchdl, (uint16_t *)&rsp_64->status, 1933 status == 0 ? BLKIF_RSP_OKAY : BLKIF_RSP_ERROR); 1934 break; 1935 default: 1936 cmn_err(CE_PANIC, "xdb@%s: unrecognised protocol: %d", 1937 ddi_get_name_addr(vdp->xs_dip), 1938 vdp->xs_blk_protocol); 1939 } 1940 1941 return (xvdi_ring_push_response(vdp->xs_ring)); 1942 } 1943 1944 static void 1945 blkif_get_x86_32_req(blkif_request_t *dst, blkif_x86_32_request_t *src) 1946 { 1947 int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST; 1948 dst->operation = src->operation; 1949 dst->nr_segments = src->nr_segments; 1950 dst->handle = src->handle; 1951 dst->id = src->id; 1952 dst->sector_number = src->sector_number; 1953 if (n > src->nr_segments) 1954 n = src->nr_segments; 1955 for (i = 0; i < n; i++) 1956 dst->seg[i] = src->seg[i]; 1957 } 1958 1959 static void 1960 blkif_get_x86_64_req(blkif_request_t *dst, blkif_x86_64_request_t *src) 1961 { 1962 int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST; 1963 dst->operation = src->operation; 1964 dst->nr_segments = src->nr_segments; 1965 dst->handle = src->handle; 1966 dst->id = src->id; 1967 dst->sector_number = src->sector_number; 1968 if (n > src->nr_segments) 1969 n = src->nr_segments; 1970 for (i = 0; i < n; i++) 1971 dst->seg[i] = src->seg[i]; 1972 } 1973