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 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * xdf.c - Xen Virtual Block Device Driver 29 * TODO: 30 * - support alternate block size (currently only DEV_BSIZE supported) 31 * - revalidate geometry for removable devices 32 */ 33 34 #pragma ident "%Z%%M% %I% %E% SMI" 35 36 #include <sys/ddi.h> 37 #include <sys/sunddi.h> 38 #include <sys/conf.h> 39 #include <sys/cmlb.h> 40 #include <sys/dkio.h> 41 #include <sys/promif.h> 42 #include <sys/sysmacros.h> 43 #include <sys/kstat.h> 44 #include <sys/mach_mmu.h> 45 #ifdef XPV_HVM_DRIVER 46 #include <sys/xpv_support.h> 47 #include <sys/sunndi.h> 48 #endif /* XPV_HVM_DRIVER */ 49 #include <public/io/xenbus.h> 50 #include <xen/sys/xenbus_impl.h> 51 #include <xen/sys/xendev.h> 52 #include <sys/gnttab.h> 53 #include <sys/scsi/generic/inquiry.h> 54 #include <xen/io/blkif_impl.h> 55 #include <io/xdf.h> 56 57 #define FLUSH_DISKCACHE 0x1 58 #define WRITE_BARRIER 0x2 59 #define DEFAULT_FLUSH_BLOCK 156 /* block to write to cause a cache flush */ 60 #define USE_WRITE_BARRIER(vdp) \ 61 ((vdp)->xdf_feature_barrier && !(vdp)->xdf_flush_supported) 62 #define USE_FLUSH_DISKCACHE(vdp) \ 63 ((vdp)->xdf_feature_barrier && (vdp)->xdf_flush_supported) 64 #define IS_WRITE_BARRIER(vdp, bp) \ 65 (!IS_READ(bp) && USE_WRITE_BARRIER(vdp) && \ 66 ((bp)->b_un.b_addr == (vdp)->xdf_cache_flush_block)) 67 #define IS_FLUSH_DISKCACHE(bp) \ 68 (!IS_READ(bp) && USE_FLUSH_DISKCACHE(vdp) && ((bp)->b_bcount == 0)) 69 70 static void *vbd_ss; 71 static kmem_cache_t *xdf_vreq_cache; 72 static kmem_cache_t *xdf_gs_cache; 73 static int xdf_maxphys = XB_MAXPHYS; 74 int xdfdebug = 0; 75 extern int do_polled_io; 76 diskaddr_t xdf_flush_block = DEFAULT_FLUSH_BLOCK; 77 int xdf_barrier_flush_disable = 0; 78 79 /* 80 * dev_ops and cb_ops entrypoints 81 */ 82 static int xdf_getinfo(dev_info_t *, ddi_info_cmd_t, void *, void **); 83 static int xdf_attach(dev_info_t *, ddi_attach_cmd_t); 84 static int xdf_detach(dev_info_t *, ddi_detach_cmd_t); 85 static int xdf_reset(dev_info_t *, ddi_reset_cmd_t); 86 static int xdf_open(dev_t *, int, int, cred_t *); 87 static int xdf_close(dev_t, int, int, struct cred *); 88 static int xdf_strategy(struct buf *); 89 static int xdf_read(dev_t, struct uio *, cred_t *); 90 static int xdf_aread(dev_t, struct aio_req *, cred_t *); 91 static int xdf_write(dev_t, struct uio *, cred_t *); 92 static int xdf_awrite(dev_t, struct aio_req *, cred_t *); 93 static int xdf_dump(dev_t, caddr_t, daddr_t, int); 94 static int xdf_ioctl(dev_t, int, intptr_t, int, cred_t *, int *); 95 static uint_t xdf_intr(caddr_t); 96 static int xdf_prop_op(dev_t, dev_info_t *, ddi_prop_op_t, int, char *, 97 caddr_t, int *); 98 99 /* 100 * misc private functions 101 */ 102 static int xdf_suspend(dev_info_t *); 103 static int xdf_resume(dev_info_t *); 104 static int xdf_start_connect(xdf_t *); 105 static int xdf_start_disconnect(xdf_t *); 106 static int xdf_post_connect(xdf_t *); 107 static void xdf_post_disconnect(xdf_t *); 108 static void xdf_oe_change(dev_info_t *, ddi_eventcookie_t, void *, void *); 109 static void xdf_iostart(xdf_t *); 110 static void xdf_iofini(xdf_t *, uint64_t, int); 111 static int xdf_prepare_rreq(xdf_t *, struct buf *, blkif_request_t *); 112 static int xdf_drain_io(xdf_t *); 113 static boolean_t xdf_isopen(xdf_t *, int); 114 static int xdf_check_state_transition(xdf_t *, XenbusState); 115 static int xdf_connect(xdf_t *, boolean_t); 116 static int xdf_dmacallback(caddr_t); 117 static void xdf_timeout_handler(void *); 118 static uint_t xdf_iorestart(caddr_t); 119 static v_req_t *vreq_get(xdf_t *, buf_t *); 120 static void vreq_free(xdf_t *, v_req_t *); 121 static int vreq_setup(xdf_t *, v_req_t *); 122 static ge_slot_t *gs_get(xdf_t *, int); 123 static void gs_free(xdf_t *, ge_slot_t *); 124 static grant_ref_t gs_grant(ge_slot_t *, mfn_t); 125 static void unexpectedie(xdf_t *); 126 static void xdfmin(struct buf *); 127 static void xdf_synthetic_pgeom(dev_info_t *, cmlb_geom_t *); 128 extern int xdf_kstat_create(dev_info_t *, char *, int); 129 extern void xdf_kstat_delete(dev_info_t *); 130 131 #if defined(XPV_HVM_DRIVER) 132 static void xdf_hvm_add(dev_info_t *); 133 static void xdf_hvm_rm(dev_info_t *); 134 static void xdf_hvm_init(void); 135 static void xdf_hvm_fini(void); 136 #endif /* XPV_HVM_DRIVER */ 137 138 static struct cb_ops xdf_cbops = { 139 xdf_open, 140 xdf_close, 141 xdf_strategy, 142 nodev, 143 xdf_dump, 144 xdf_read, 145 xdf_write, 146 xdf_ioctl, 147 nodev, 148 nodev, 149 nodev, 150 nochpoll, 151 xdf_prop_op, 152 NULL, 153 D_MP | D_NEW | D_64BIT, 154 CB_REV, 155 xdf_aread, 156 xdf_awrite 157 }; 158 159 struct dev_ops xdf_devops = { 160 DEVO_REV, /* devo_rev */ 161 0, /* devo_refcnt */ 162 xdf_getinfo, /* devo_getinfo */ 163 nulldev, /* devo_identify */ 164 nulldev, /* devo_probe */ 165 xdf_attach, /* devo_attach */ 166 xdf_detach, /* devo_detach */ 167 xdf_reset, /* devo_reset */ 168 &xdf_cbops, /* devo_cb_ops */ 169 (struct bus_ops *)NULL /* devo_bus_ops */ 170 }; 171 172 static struct modldrv modldrv = { 173 &mod_driverops, /* Type of module. This one is a driver */ 174 "virtual block driver %I%", /* short description */ 175 &xdf_devops /* driver specific ops */ 176 }; 177 178 static struct modlinkage xdf_modlinkage = { 179 MODREV_1, (void *)&modldrv, NULL 180 }; 181 182 /* 183 * I/O buffer DMA attributes 184 * Make sure: one DMA window contains BLKIF_MAX_SEGMENTS_PER_REQUEST at most 185 */ 186 static ddi_dma_attr_t xb_dma_attr = { 187 DMA_ATTR_V0, 188 (uint64_t)0, /* lowest address */ 189 (uint64_t)0xffffffffffffffff, /* highest usable address */ 190 (uint64_t)0xffffff, /* DMA counter limit max */ 191 (uint64_t)XB_BSIZE, /* alignment in bytes */ 192 XB_BSIZE - 1, /* bitmap of burst sizes */ 193 XB_BSIZE, /* min transfer */ 194 (uint64_t)XB_MAX_XFER, /* maximum transfer */ 195 (uint64_t)PAGEOFFSET, /* 1 page segment length */ 196 BLKIF_MAX_SEGMENTS_PER_REQUEST, /* maximum number of segments */ 197 XB_BSIZE, /* granularity */ 198 0, /* flags (reserved) */ 199 }; 200 201 static ddi_device_acc_attr_t xc_acc_attr = { 202 DDI_DEVICE_ATTR_V0, 203 DDI_NEVERSWAP_ACC, 204 DDI_STRICTORDER_ACC 205 }; 206 207 /* callbacks from commmon label */ 208 209 int xdf_lb_rdwr(dev_info_t *, uchar_t, void *, diskaddr_t, size_t, void *); 210 int xdf_lb_getinfo(dev_info_t *, int, void *, void *); 211 212 static cmlb_tg_ops_t xdf_lb_ops = { 213 TG_DK_OPS_VERSION_1, 214 xdf_lb_rdwr, 215 xdf_lb_getinfo 216 }; 217 218 int 219 _init(void) 220 { 221 int rc; 222 223 if ((rc = ddi_soft_state_init(&vbd_ss, sizeof (xdf_t), 0)) != 0) 224 return (rc); 225 226 xdf_vreq_cache = kmem_cache_create("xdf_vreq_cache", 227 sizeof (v_req_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 228 xdf_gs_cache = kmem_cache_create("xdf_gs_cache", 229 sizeof (ge_slot_t), 0, NULL, NULL, NULL, NULL, NULL, 0); 230 231 #if defined(XPV_HVM_DRIVER) 232 xdf_hvm_init(); 233 #endif /* XPV_HVM_DRIVER */ 234 235 if ((rc = mod_install(&xdf_modlinkage)) != 0) { 236 #if defined(XPV_HVM_DRIVER) 237 xdf_hvm_fini(); 238 #endif /* XPV_HVM_DRIVER */ 239 kmem_cache_destroy(xdf_vreq_cache); 240 kmem_cache_destroy(xdf_gs_cache); 241 ddi_soft_state_fini(&vbd_ss); 242 return (rc); 243 } 244 245 return (rc); 246 } 247 248 int 249 _fini(void) 250 { 251 252 int err; 253 if ((err = mod_remove(&xdf_modlinkage)) != 0) 254 return (err); 255 256 #if defined(XPV_HVM_DRIVER) 257 xdf_hvm_fini(); 258 #endif /* XPV_HVM_DRIVER */ 259 260 kmem_cache_destroy(xdf_vreq_cache); 261 kmem_cache_destroy(xdf_gs_cache); 262 ddi_soft_state_fini(&vbd_ss); 263 264 return (0); 265 } 266 267 int 268 _info(struct modinfo *modinfop) 269 { 270 return (mod_info(&xdf_modlinkage, modinfop)); 271 } 272 273 /*ARGSUSED*/ 274 static int 275 xdf_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **rp) 276 { 277 int instance; 278 xdf_t *vbdp; 279 280 instance = XDF_INST(getminor((dev_t)arg)); 281 282 switch (cmd) { 283 case DDI_INFO_DEVT2DEVINFO: 284 if ((vbdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) { 285 *rp = NULL; 286 return (DDI_FAILURE); 287 } 288 *rp = vbdp->xdf_dip; 289 return (DDI_SUCCESS); 290 291 case DDI_INFO_DEVT2INSTANCE: 292 *rp = (void *)(uintptr_t)instance; 293 return (DDI_SUCCESS); 294 295 default: 296 return (DDI_FAILURE); 297 } 298 } 299 300 static int 301 xdf_prop_op(dev_t dev, dev_info_t *dip, ddi_prop_op_t prop_op, int mod_flags, 302 char *name, caddr_t valuep, int *lengthp) 303 { 304 int instance = ddi_get_instance(dip); 305 xdf_t *vdp; 306 diskaddr_t p_blkcnt; 307 308 /* 309 * xdf dynamic properties are device specific and size oriented. 310 * Requests issued under conditions where size is valid are passed 311 * to ddi_prop_op_nblocks with the size information, otherwise the 312 * request is passed to ddi_prop_op. 313 */ 314 vdp = ddi_get_soft_state(vbd_ss, instance); 315 316 if ((dev == DDI_DEV_T_ANY) || (vdp == NULL)) 317 return (ddi_prop_op(dev, dip, prop_op, mod_flags, 318 name, valuep, lengthp)); 319 320 /* do cv_wait until connected or failed */ 321 mutex_enter(&vdp->xdf_dev_lk); 322 if (xdf_connect(vdp, B_TRUE) != XD_READY) { 323 mutex_exit(&vdp->xdf_dev_lk); 324 goto out; 325 } 326 mutex_exit(&vdp->xdf_dev_lk); 327 328 if (cmlb_partinfo(vdp->xdf_vd_lbl, XDF_PART(getminor(dev)), &p_blkcnt, 329 NULL, NULL, NULL, NULL) == 0) 330 return (ddi_prop_op_nblocks(dev, dip, prop_op, mod_flags, 331 name, valuep, lengthp, (uint64_t)p_blkcnt)); 332 333 out: 334 return (ddi_prop_op(dev, dip, prop_op, mod_flags, name, valuep, 335 lengthp)); 336 } 337 338 static int 339 xdf_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) 340 { 341 xdf_t *vdp; 342 ddi_iblock_cookie_t softibc; 343 int instance; 344 345 xdfdebug = ddi_prop_get_int(DDI_DEV_T_ANY, devi, DDI_PROP_NOTPROM, 346 "xdfdebug", 0); 347 348 switch (cmd) { 349 case DDI_ATTACH: 350 break; 351 352 case DDI_RESUME: 353 return (xdf_resume(devi)); 354 355 default: 356 return (DDI_FAILURE); 357 } 358 359 instance = ddi_get_instance(devi); 360 if (ddi_soft_state_zalloc(vbd_ss, instance) != DDI_SUCCESS) 361 return (DDI_FAILURE); 362 363 DPRINTF(DDI_DBG, ("xdf%d: attaching\n", instance)); 364 vdp = ddi_get_soft_state(vbd_ss, instance); 365 ddi_set_driver_private(devi, vdp); 366 vdp->xdf_dip = devi; 367 cv_init(&vdp->xdf_dev_cv, NULL, CV_DEFAULT, NULL); 368 369 if (ddi_get_iblock_cookie(devi, 0, &vdp->xdf_ibc) != DDI_SUCCESS) { 370 cmn_err(CE_WARN, "xdf@%s: failed to get iblock cookie", 371 ddi_get_name_addr(devi)); 372 goto errout0; 373 } 374 mutex_init(&vdp->xdf_dev_lk, NULL, MUTEX_DRIVER, (void *)vdp->xdf_ibc); 375 mutex_init(&vdp->xdf_cb_lk, NULL, MUTEX_DRIVER, (void *)vdp->xdf_ibc); 376 mutex_init(&vdp->xdf_iostat_lk, NULL, MUTEX_DRIVER, 377 (void *)vdp->xdf_ibc); 378 379 if (ddi_get_soft_iblock_cookie(devi, DDI_SOFTINT_LOW, &softibc) 380 != DDI_SUCCESS) { 381 cmn_err(CE_WARN, "xdf@%s: failed to get softintr iblock cookie", 382 ddi_get_name_addr(devi)); 383 goto errout0; 384 } 385 if (ddi_add_softintr(devi, DDI_SOFTINT_LOW, &vdp->xdf_softintr_id, 386 &softibc, NULL, xdf_iorestart, (caddr_t)vdp) != DDI_SUCCESS) { 387 cmn_err(CE_WARN, "xdf@%s: failed to add softintr", 388 ddi_get_name_addr(devi)); 389 goto errout0; 390 } 391 392 #if !defined(XPV_HVM_DRIVER) 393 /* create kstat for iostat(1M) */ 394 if (xdf_kstat_create(devi, "xdf", instance) != 0) { 395 cmn_err(CE_WARN, "xdf@%s: failed to create kstat", 396 ddi_get_name_addr(devi)); 397 goto errout0; 398 } 399 #endif /* !XPV_HVM_DRIVER */ 400 401 /* driver handles kernel-issued IOCTLs */ 402 if (ddi_prop_create(DDI_DEV_T_NONE, devi, DDI_PROP_CANSLEEP, 403 DDI_KERNEL_IOCTL, NULL, 0) != DDI_PROP_SUCCESS) { 404 cmn_err(CE_WARN, "xdf@%s: cannot create DDI_KERNEL_IOCTL prop", 405 ddi_get_name_addr(devi)); 406 goto errout0; 407 } 408 409 /* 410 * Initialize the physical geometry stucture. Note that currently 411 * we don't know the size of the backend device so the number 412 * of blocks on the device will be initialized to zero. Once 413 * we connect to the backend device we'll update the physical 414 * geometry to reflect the real size of the device. 415 */ 416 xdf_synthetic_pgeom(devi, &vdp->xdf_pgeom); 417 418 /* 419 * create default device minor nodes: non-removable disk 420 * we will adjust minor nodes after we are connected w/ backend 421 */ 422 cmlb_alloc_handle(&vdp->xdf_vd_lbl); 423 if (cmlb_attach(devi, &xdf_lb_ops, DTYPE_DIRECT, 0, 1, DDI_NT_BLOCK, 424 #if defined(XPV_HVM_DRIVER) 425 CMLB_CREATE_ALTSLICE_VTOC_16_DTYPE_DIRECT | 426 CMLB_INTERNAL_MINOR_NODES, 427 #else /* !XPV_HVM_DRIVER */ 428 CMLB_FAKE_LABEL_ONE_PARTITION, 429 #endif /* !XPV_HVM_DRIVER */ 430 vdp->xdf_vd_lbl, NULL) != 0) { 431 cmn_err(CE_WARN, "xdf@%s: default cmlb attach failed", 432 ddi_get_name_addr(devi)); 433 goto errout0; 434 } 435 436 /* 437 * We ship with cache-enabled disks 438 */ 439 vdp->xdf_wce = 1; 440 441 mutex_enter(&vdp->xdf_cb_lk); 442 443 /* Watch backend XenbusState change */ 444 if (xvdi_add_event_handler(devi, XS_OE_STATE, 445 xdf_oe_change) != DDI_SUCCESS) { 446 mutex_exit(&vdp->xdf_cb_lk); 447 goto errout0; 448 } 449 450 if (xdf_start_connect(vdp) != DDI_SUCCESS) { 451 cmn_err(CE_WARN, "xdf@%s: start connection failed", 452 ddi_get_name_addr(devi)); 453 (void) xdf_start_disconnect(vdp); 454 mutex_exit(&vdp->xdf_cb_lk); 455 goto errout1; 456 } 457 458 mutex_exit(&vdp->xdf_cb_lk); 459 460 list_create(&vdp->xdf_vreq_act, sizeof (v_req_t), 461 offsetof(v_req_t, v_link)); 462 list_create(&vdp->xdf_gs_act, sizeof (ge_slot_t), 463 offsetof(ge_slot_t, link)); 464 465 #if defined(XPV_HVM_DRIVER) 466 xdf_hvm_add(devi); 467 468 (void) ddi_prop_update_int(DDI_DEV_T_NONE, devi, DDI_NO_AUTODETACH, 1); 469 470 /* 471 * Report our version to dom0. 472 */ 473 if (xenbus_printf(XBT_NULL, "hvmpv/xdf", "version", "%d", 474 HVMPV_XDF_VERS)) 475 cmn_err(CE_WARN, "xdf: couldn't write version\n"); 476 #endif /* XPV_HVM_DRIVER */ 477 478 ddi_report_dev(devi); 479 480 DPRINTF(DDI_DBG, ("xdf%d: attached\n", instance)); 481 482 return (DDI_SUCCESS); 483 484 errout1: 485 xvdi_remove_event_handler(devi, XS_OE_STATE); 486 errout0: 487 if (vdp->xdf_vd_lbl != NULL) { 488 cmlb_detach(vdp->xdf_vd_lbl, NULL); 489 cmlb_free_handle(&vdp->xdf_vd_lbl); 490 } 491 #if !defined(XPV_HVM_DRIVER) 492 xdf_kstat_delete(devi); 493 #endif /* !XPV_HVM_DRIVER */ 494 if (vdp->xdf_softintr_id != NULL) 495 ddi_remove_softintr(vdp->xdf_softintr_id); 496 if (vdp->xdf_ibc != NULL) { 497 mutex_destroy(&vdp->xdf_cb_lk); 498 mutex_destroy(&vdp->xdf_dev_lk); 499 } 500 cv_destroy(&vdp->xdf_dev_cv); 501 ddi_soft_state_free(vbd_ss, instance); 502 ddi_set_driver_private(devi, NULL); 503 ddi_prop_remove_all(devi); 504 cmn_err(CE_WARN, "xdf@%s: attach failed", ddi_get_name_addr(devi)); 505 return (DDI_FAILURE); 506 } 507 508 static int 509 xdf_detach(dev_info_t *devi, ddi_detach_cmd_t cmd) 510 { 511 xdf_t *vdp; 512 int instance; 513 514 switch (cmd) { 515 516 case DDI_PM_SUSPEND: 517 break; 518 519 case DDI_SUSPEND: 520 return (xdf_suspend(devi)); 521 522 case DDI_DETACH: 523 break; 524 525 default: 526 return (DDI_FAILURE); 527 } 528 529 instance = ddi_get_instance(devi); 530 DPRINTF(DDI_DBG, ("xdf%d: detaching\n", instance)); 531 vdp = ddi_get_soft_state(vbd_ss, instance); 532 533 if (vdp == NULL) 534 return (DDI_FAILURE); 535 536 mutex_enter(&vdp->xdf_dev_lk); 537 if (xdf_isopen(vdp, -1)) { 538 mutex_exit(&vdp->xdf_dev_lk); 539 return (DDI_FAILURE); 540 } 541 542 if (vdp->xdf_status != XD_CLOSED) { 543 mutex_exit(&vdp->xdf_dev_lk); 544 return (DDI_FAILURE); 545 } 546 547 #if defined(XPV_HVM_DRIVER) 548 xdf_hvm_rm(devi); 549 #endif /* XPV_HVM_DRIVER */ 550 551 ASSERT(!ISDMACBON(vdp)); 552 mutex_exit(&vdp->xdf_dev_lk); 553 554 if (vdp->xdf_timeout_id != 0) 555 (void) untimeout(vdp->xdf_timeout_id); 556 557 xvdi_remove_event_handler(devi, XS_OE_STATE); 558 559 /* we'll support backend running in domU later */ 560 #ifdef DOMU_BACKEND 561 (void) xvdi_post_event(devi, XEN_HP_REMOVE); 562 #endif 563 564 list_destroy(&vdp->xdf_vreq_act); 565 list_destroy(&vdp->xdf_gs_act); 566 ddi_prop_remove_all(devi); 567 xdf_kstat_delete(devi); 568 ddi_remove_softintr(vdp->xdf_softintr_id); 569 ddi_set_driver_private(devi, NULL); 570 cv_destroy(&vdp->xdf_dev_cv); 571 mutex_destroy(&vdp->xdf_cb_lk); 572 mutex_destroy(&vdp->xdf_dev_lk); 573 if (vdp->xdf_cache_flush_block != NULL) 574 kmem_free(vdp->xdf_flush_mem, 2 * DEV_BSIZE); 575 ddi_soft_state_free(vbd_ss, instance); 576 return (DDI_SUCCESS); 577 } 578 579 static int 580 xdf_suspend(dev_info_t *devi) 581 { 582 xdf_t *vdp; 583 int instance; 584 enum xdf_state st; 585 586 instance = ddi_get_instance(devi); 587 588 if (xdfdebug & SUSRES_DBG) 589 xen_printf("xdf_suspend: xdf#%d\n", instance); 590 591 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 592 return (DDI_FAILURE); 593 594 xvdi_suspend(devi); 595 596 mutex_enter(&vdp->xdf_cb_lk); 597 mutex_enter(&vdp->xdf_dev_lk); 598 st = vdp->xdf_status; 599 /* change status to stop further I/O requests */ 600 if (st == XD_READY) 601 vdp->xdf_status = XD_SUSPEND; 602 mutex_exit(&vdp->xdf_dev_lk); 603 mutex_exit(&vdp->xdf_cb_lk); 604 605 /* make sure no more I/O responses left in the ring buffer */ 606 if ((st == XD_INIT) || (st == XD_READY)) { 607 #ifdef XPV_HVM_DRIVER 608 ec_unbind_evtchn(vdp->xdf_evtchn); 609 #else /* !XPV_HVM_DRIVER */ 610 (void) ddi_remove_intr(devi, 0, NULL); 611 #endif /* !XPV_HVM_DRIVER */ 612 (void) xdf_drain_io(vdp); 613 /* 614 * no need to teardown the ring buffer here 615 * it will be simply re-init'ed during resume when 616 * we call xvdi_alloc_ring 617 */ 618 } 619 620 if (xdfdebug & SUSRES_DBG) 621 xen_printf("xdf_suspend: SUCCESS\n"); 622 623 return (DDI_SUCCESS); 624 } 625 626 /*ARGSUSED*/ 627 static int 628 xdf_resume(dev_info_t *devi) 629 { 630 xdf_t *vdp; 631 int instance; 632 633 instance = ddi_get_instance(devi); 634 if (xdfdebug & SUSRES_DBG) 635 xen_printf("xdf_resume: xdf%d\n", instance); 636 637 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 638 return (DDI_FAILURE); 639 640 mutex_enter(&vdp->xdf_cb_lk); 641 642 if (xvdi_resume(devi) != DDI_SUCCESS) { 643 mutex_exit(&vdp->xdf_cb_lk); 644 return (DDI_FAILURE); 645 } 646 647 mutex_enter(&vdp->xdf_dev_lk); 648 ASSERT(vdp->xdf_status != XD_READY); 649 vdp->xdf_status = XD_UNKNOWN; 650 mutex_exit(&vdp->xdf_dev_lk); 651 652 if (xdf_start_connect(vdp) != DDI_SUCCESS) { 653 mutex_exit(&vdp->xdf_cb_lk); 654 return (DDI_FAILURE); 655 } 656 657 mutex_exit(&vdp->xdf_cb_lk); 658 659 if (xdfdebug & SUSRES_DBG) 660 xen_printf("xdf_resume: done\n"); 661 return (DDI_SUCCESS); 662 } 663 664 /*ARGSUSED*/ 665 static int 666 xdf_reset(dev_info_t *devi, ddi_reset_cmd_t cmd) 667 { 668 xdf_t *vdp; 669 int instance; 670 671 instance = ddi_get_instance(devi); 672 DPRINTF(DDI_DBG, ("xdf%d: resetting\n", instance)); 673 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 674 return (DDI_FAILURE); 675 676 /* 677 * wait for any outstanding I/O to complete 678 */ 679 (void) xdf_drain_io(vdp); 680 681 DPRINTF(DDI_DBG, ("xdf%d: reset complete\n", instance)); 682 return (DDI_SUCCESS); 683 } 684 685 static int 686 xdf_open(dev_t *devp, int flag, int otyp, cred_t *credp) 687 { 688 minor_t minor; 689 xdf_t *vdp; 690 int part; 691 ulong_t parbit; 692 diskaddr_t p_blkct = 0; 693 boolean_t firstopen; 694 boolean_t nodelay; 695 696 minor = getminor(*devp); 697 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 698 return (ENXIO); 699 700 nodelay = (flag & (FNDELAY | FNONBLOCK)); 701 702 DPRINTF(DDI_DBG, ("xdf%d: opening\n", XDF_INST(minor))); 703 704 /* do cv_wait until connected or failed */ 705 mutex_enter(&vdp->xdf_dev_lk); 706 if (!nodelay && (xdf_connect(vdp, B_TRUE) != XD_READY)) { 707 mutex_exit(&vdp->xdf_dev_lk); 708 return (ENXIO); 709 } 710 711 if ((flag & FWRITE) && XD_IS_RO(vdp)) { 712 mutex_exit(&vdp->xdf_dev_lk); 713 return (EROFS); 714 } 715 716 part = XDF_PART(minor); 717 parbit = 1 << part; 718 if ((vdp->xdf_vd_exclopen & parbit) || 719 ((flag & FEXCL) && xdf_isopen(vdp, part))) { 720 mutex_exit(&vdp->xdf_dev_lk); 721 return (EBUSY); 722 } 723 724 /* are we the first one to open this node? */ 725 firstopen = !xdf_isopen(vdp, -1); 726 727 if (otyp == OTYP_LYR) 728 vdp->xdf_vd_lyropen[part]++; 729 730 vdp->xdf_vd_open[otyp] |= parbit; 731 732 if (flag & FEXCL) 733 vdp->xdf_vd_exclopen |= parbit; 734 735 mutex_exit(&vdp->xdf_dev_lk); 736 737 /* force a re-validation */ 738 if (firstopen) 739 cmlb_invalidate(vdp->xdf_vd_lbl, NULL); 740 741 /* 742 * check size 743 * ignore CD/DVD which contains a zero-sized s0 744 */ 745 if (!nodelay && !XD_IS_CD(vdp) && 746 ((cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkct, 747 NULL, NULL, NULL, NULL) != 0) || (p_blkct == 0))) { 748 (void) xdf_close(*devp, flag, otyp, credp); 749 return (ENXIO); 750 } 751 752 return (0); 753 } 754 755 /*ARGSUSED*/ 756 static int 757 xdf_close(dev_t dev, int flag, int otyp, struct cred *credp) 758 { 759 minor_t minor; 760 xdf_t *vdp; 761 int part; 762 ulong_t parbit; 763 764 minor = getminor(dev); 765 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 766 return (ENXIO); 767 768 mutex_enter(&vdp->xdf_dev_lk); 769 part = XDF_PART(minor); 770 if (!xdf_isopen(vdp, part)) { 771 mutex_exit(&vdp->xdf_dev_lk); 772 return (ENXIO); 773 } 774 parbit = 1 << part; 775 776 ASSERT((vdp->xdf_vd_open[otyp] & parbit) != 0); 777 if (otyp == OTYP_LYR) { 778 ASSERT(vdp->xdf_vd_lyropen[part] > 0); 779 if (--vdp->xdf_vd_lyropen[part] == 0) 780 vdp->xdf_vd_open[otyp] &= ~parbit; 781 } else { 782 vdp->xdf_vd_open[otyp] &= ~parbit; 783 } 784 vdp->xdf_vd_exclopen &= ~parbit; 785 786 mutex_exit(&vdp->xdf_dev_lk); 787 return (0); 788 } 789 790 static int 791 xdf_strategy(struct buf *bp) 792 { 793 xdf_t *vdp; 794 minor_t minor; 795 diskaddr_t p_blkct, p_blkst; 796 ulong_t nblks; 797 int part; 798 799 minor = getminor(bp->b_edev); 800 part = XDF_PART(minor); 801 802 vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor)); 803 if ((vdp == NULL) || !xdf_isopen(vdp, part)) { 804 bioerror(bp, ENXIO); 805 bp->b_resid = bp->b_bcount; 806 biodone(bp); 807 return (0); 808 } 809 810 /* Check for writes to a read only device */ 811 if (!IS_READ(bp) && XD_IS_RO(vdp)) { 812 bioerror(bp, EROFS); 813 bp->b_resid = bp->b_bcount; 814 biodone(bp); 815 return (0); 816 } 817 818 /* Check if this I/O is accessing a partition or the entire disk */ 819 if ((long)bp->b_private == XB_SLICE_NONE) { 820 /* This I/O is using an absolute offset */ 821 p_blkct = vdp->xdf_xdev_nblocks; 822 p_blkst = 0; 823 } else { 824 /* This I/O is using a partition relative offset */ 825 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkct, 826 &p_blkst, NULL, NULL, NULL)) { 827 bioerror(bp, ENXIO); 828 bp->b_resid = bp->b_bcount; 829 biodone(bp); 830 return (0); 831 } 832 } 833 834 /* check for a starting block beyond the disk or partition limit */ 835 if (bp->b_blkno > p_blkct) { 836 DPRINTF(IO_DBG, ("xdf: block %lld exceeds VBD size %"PRIu64, 837 (longlong_t)bp->b_blkno, (uint64_t)p_blkct)); 838 bioerror(bp, EINVAL); 839 bp->b_resid = bp->b_bcount; 840 biodone(bp); 841 return (0); 842 } 843 844 /* Legacy: don't set error flag at this case */ 845 if (bp->b_blkno == p_blkct) { 846 bp->b_resid = bp->b_bcount; 847 biodone(bp); 848 return (0); 849 } 850 851 /* Adjust for partial transfer */ 852 nblks = bp->b_bcount >> XB_BSHIFT; 853 if ((bp->b_blkno + nblks) > p_blkct) { 854 bp->b_resid = ((bp->b_blkno + nblks) - p_blkct) << XB_BSHIFT; 855 bp->b_bcount -= bp->b_resid; 856 } 857 858 DPRINTF(IO_DBG, ("xdf: strategy blk %lld len %lu\n", 859 (longlong_t)bp->b_blkno, (ulong_t)bp->b_bcount)); 860 861 /* Fix up the buf struct */ 862 bp->b_flags |= B_BUSY; 863 bp->av_forw = bp->av_back = NULL; /* not tagged with a v_req */ 864 bp->b_private = (void *)(uintptr_t)p_blkst; 865 866 mutex_enter(&vdp->xdf_dev_lk); 867 if (vdp->xdf_xdev_iostat != NULL) 868 kstat_waitq_enter(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 869 if (vdp->xdf_f_act == NULL) { 870 vdp->xdf_f_act = vdp->xdf_l_act = bp; 871 } else { 872 vdp->xdf_l_act->av_forw = bp; 873 vdp->xdf_l_act = bp; 874 } 875 mutex_exit(&vdp->xdf_dev_lk); 876 877 xdf_iostart(vdp); 878 if (do_polled_io) 879 (void) xdf_drain_io(vdp); 880 return (0); 881 } 882 883 /*ARGSUSED*/ 884 static int 885 xdf_read(dev_t dev, struct uio *uiop, cred_t *credp) 886 { 887 888 xdf_t *vdp; 889 minor_t minor; 890 diskaddr_t p_blkcnt; 891 int part; 892 893 minor = getminor(dev); 894 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 895 return (ENXIO); 896 897 DPRINTF(IO_DBG, ("xdf: read offset 0x%"PRIx64"\n", 898 (int64_t)uiop->uio_offset)); 899 900 part = XDF_PART(minor); 901 if (!xdf_isopen(vdp, part)) 902 return (ENXIO); 903 904 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 905 NULL, NULL, NULL, NULL)) 906 return (ENXIO); 907 908 if (U_INVAL(uiop)) 909 return (EINVAL); 910 911 return (physio(xdf_strategy, NULL, dev, B_READ, xdfmin, uiop)); 912 } 913 914 /*ARGSUSED*/ 915 static int 916 xdf_write(dev_t dev, struct uio *uiop, cred_t *credp) 917 { 918 xdf_t *vdp; 919 minor_t minor; 920 diskaddr_t p_blkcnt; 921 int part; 922 923 minor = getminor(dev); 924 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 925 return (ENXIO); 926 927 DPRINTF(IO_DBG, ("xdf: write offset 0x%"PRIx64"\n", 928 (int64_t)uiop->uio_offset)); 929 930 part = XDF_PART(minor); 931 if (!xdf_isopen(vdp, part)) 932 return (ENXIO); 933 934 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 935 NULL, NULL, NULL, NULL)) 936 return (ENXIO); 937 938 if (uiop->uio_loffset >= XB_DTOB(p_blkcnt)) 939 return (ENOSPC); 940 941 if (U_INVAL(uiop)) 942 return (EINVAL); 943 944 return (physio(xdf_strategy, NULL, dev, B_WRITE, minphys, uiop)); 945 } 946 947 /*ARGSUSED*/ 948 static int 949 xdf_aread(dev_t dev, struct aio_req *aiop, cred_t *credp) 950 { 951 xdf_t *vdp; 952 minor_t minor; 953 struct uio *uiop = aiop->aio_uio; 954 diskaddr_t p_blkcnt; 955 int part; 956 957 minor = getminor(dev); 958 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 959 return (ENXIO); 960 961 part = XDF_PART(minor); 962 if (!xdf_isopen(vdp, part)) 963 return (ENXIO); 964 965 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 966 NULL, NULL, NULL, NULL)) 967 return (ENXIO); 968 969 if (uiop->uio_loffset >= XB_DTOB(p_blkcnt)) 970 return (ENOSPC); 971 972 if (U_INVAL(uiop)) 973 return (EINVAL); 974 975 return (aphysio(xdf_strategy, anocancel, dev, B_READ, minphys, aiop)); 976 } 977 978 /*ARGSUSED*/ 979 static int 980 xdf_awrite(dev_t dev, struct aio_req *aiop, cred_t *credp) 981 { 982 xdf_t *vdp; 983 minor_t minor; 984 struct uio *uiop = aiop->aio_uio; 985 diskaddr_t p_blkcnt; 986 int part; 987 988 minor = getminor(dev); 989 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 990 return (ENXIO); 991 992 part = XDF_PART(minor); 993 if (!xdf_isopen(vdp, part)) 994 return (ENXIO); 995 996 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 997 NULL, NULL, NULL, NULL)) 998 return (ENXIO); 999 1000 if (uiop->uio_loffset >= XB_DTOB(p_blkcnt)) 1001 return (ENOSPC); 1002 1003 if (U_INVAL(uiop)) 1004 return (EINVAL); 1005 1006 return (aphysio(xdf_strategy, anocancel, dev, B_WRITE, minphys, aiop)); 1007 } 1008 1009 static int 1010 xdf_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblk) 1011 { 1012 struct buf dumpbuf, *dbp; 1013 xdf_t *vdp; 1014 minor_t minor; 1015 int err = 0; 1016 int part; 1017 diskaddr_t p_blkcnt, p_blkst; 1018 1019 minor = getminor(dev); 1020 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 1021 return (ENXIO); 1022 1023 DPRINTF(IO_DBG, ("xdf: dump addr (0x%p) blk (%ld) nblks (%d)\n", 1024 addr, blkno, nblk)); 1025 1026 part = XDF_PART(minor); 1027 if (!xdf_isopen(vdp, part)) 1028 return (ENXIO); 1029 1030 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, &p_blkst, 1031 NULL, NULL, NULL)) 1032 return (ENXIO); 1033 1034 if ((blkno + nblk) > p_blkcnt) { 1035 cmn_err(CE_WARN, "xdf: block %ld exceeds VBD size %"PRIu64, 1036 blkno + nblk, (uint64_t)p_blkcnt); 1037 return (EINVAL); 1038 } 1039 1040 dbp = &dumpbuf; 1041 bioinit(dbp); 1042 dbp->b_flags = B_BUSY; 1043 dbp->b_un.b_addr = addr; 1044 dbp->b_bcount = nblk << DEV_BSHIFT; 1045 dbp->b_blkno = blkno; 1046 dbp->b_edev = dev; 1047 dbp->b_private = (void *)(uintptr_t)p_blkst; 1048 1049 mutex_enter(&vdp->xdf_dev_lk); 1050 if (vdp->xdf_xdev_iostat != NULL) 1051 kstat_waitq_enter(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1052 if (vdp->xdf_f_act == NULL) { 1053 vdp->xdf_f_act = vdp->xdf_l_act = dbp; 1054 } else { 1055 vdp->xdf_l_act->av_forw = dbp; 1056 vdp->xdf_l_act = dbp; 1057 } 1058 dbp->av_forw = NULL; 1059 dbp->av_back = NULL; 1060 mutex_exit(&vdp->xdf_dev_lk); 1061 xdf_iostart(vdp); 1062 err = xdf_drain_io(vdp); 1063 biofini(dbp); 1064 return (err); 1065 } 1066 1067 /*ARGSUSED*/ 1068 static int 1069 xdf_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp, 1070 int *rvalp) 1071 { 1072 int instance; 1073 xdf_t *vdp; 1074 minor_t minor; 1075 int part; 1076 1077 minor = getminor(dev); 1078 instance = XDF_INST(minor); 1079 1080 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 1081 return (ENXIO); 1082 1083 DPRINTF(IOCTL_DBG, ("xdf%d:ioctl: cmd %d (0x%x)\n", 1084 instance, cmd, cmd)); 1085 1086 part = XDF_PART(minor); 1087 if (!xdf_isopen(vdp, part)) 1088 return (ENXIO); 1089 1090 switch (cmd) { 1091 case DKIOCGMEDIAINFO: { 1092 struct dk_minfo media_info; 1093 1094 media_info.dki_lbsize = DEV_BSIZE; 1095 media_info.dki_capacity = vdp->xdf_pgeom.g_capacity; 1096 media_info.dki_media_type = DK_FIXED_DISK; 1097 1098 if (ddi_copyout(&media_info, (void *)arg, 1099 sizeof (struct dk_minfo), mode)) { 1100 return (EFAULT); 1101 } else { 1102 return (0); 1103 } 1104 } 1105 1106 case DKIOCINFO: { 1107 struct dk_cinfo info; 1108 1109 /* controller information */ 1110 if (XD_IS_CD(vdp)) 1111 info.dki_ctype = DKC_CDROM; 1112 else 1113 info.dki_ctype = DKC_VBD; 1114 1115 info.dki_cnum = 0; 1116 (void) strncpy((char *)(&info.dki_cname), "xdf", 8); 1117 1118 /* unit information */ 1119 info.dki_unit = ddi_get_instance(vdp->xdf_dip); 1120 (void) strncpy((char *)(&info.dki_dname), "xdf", 8); 1121 info.dki_flags = DKI_FMTVOL; 1122 info.dki_partition = part; 1123 info.dki_maxtransfer = maxphys / DEV_BSIZE; 1124 info.dki_addr = 0; 1125 info.dki_space = 0; 1126 info.dki_prio = 0; 1127 info.dki_vec = 0; 1128 1129 if (ddi_copyout(&info, (void *)arg, sizeof (info), mode)) 1130 return (EFAULT); 1131 else 1132 return (0); 1133 } 1134 1135 case DKIOCSTATE: { 1136 enum dkio_state dkstate = DKIO_INSERTED; 1137 if (ddi_copyout(&dkstate, (void *)arg, sizeof (dkstate), 1138 mode) != 0) 1139 return (EFAULT); 1140 return (0); 1141 } 1142 1143 /* 1144 * is media removable? 1145 */ 1146 case DKIOCREMOVABLE: { 1147 int i = XD_IS_RM(vdp) ? 1 : 0; 1148 if (ddi_copyout(&i, (caddr_t)arg, sizeof (int), mode)) 1149 return (EFAULT); 1150 return (0); 1151 } 1152 1153 case DKIOCG_PHYGEOM: 1154 case DKIOCG_VIRTGEOM: 1155 case DKIOCGGEOM: 1156 case DKIOCSGEOM: 1157 case DKIOCGAPART: 1158 case DKIOCSAPART: 1159 case DKIOCGVTOC: 1160 case DKIOCSVTOC: 1161 case DKIOCPARTINFO: 1162 case DKIOCGMBOOT: 1163 case DKIOCSMBOOT: 1164 case DKIOCGETEFI: 1165 case DKIOCSETEFI: 1166 case DKIOCPARTITION: { 1167 int rc; 1168 1169 rc = cmlb_ioctl(vdp->xdf_vd_lbl, dev, cmd, arg, mode, credp, 1170 rvalp, NULL); 1171 return (rc); 1172 } 1173 1174 case DKIOCGETWCE: 1175 if (ddi_copyout(&vdp->xdf_wce, (void *)arg, 1176 sizeof (vdp->xdf_wce), mode)) 1177 return (EFAULT); 1178 return (0); 1179 case DKIOCSETWCE: 1180 if (ddi_copyin((void *)arg, &vdp->xdf_wce, 1181 sizeof (vdp->xdf_wce), mode)) 1182 return (EFAULT); 1183 return (0); 1184 case DKIOCFLUSHWRITECACHE: { 1185 int rc; 1186 struct dk_callback *dkc = (struct dk_callback *)arg; 1187 1188 if (vdp->xdf_flush_supported) { 1189 rc = xdf_lb_rdwr(vdp->xdf_dip, TG_WRITE, 1190 NULL, 0, 0, (void *)dev); 1191 } else if (vdp->xdf_feature_barrier && 1192 !xdf_barrier_flush_disable) { 1193 rc = xdf_lb_rdwr(vdp->xdf_dip, TG_WRITE, 1194 vdp->xdf_cache_flush_block, xdf_flush_block, 1195 DEV_BSIZE, (void *)dev); 1196 } else { 1197 return (ENOTTY); 1198 } 1199 if ((mode & FKIOCTL) && (dkc != NULL) && 1200 (dkc->dkc_callback != NULL)) { 1201 (*dkc->dkc_callback)(dkc->dkc_cookie, rc); 1202 /* need to return 0 after calling callback */ 1203 rc = 0; 1204 } 1205 return (rc); 1206 } 1207 1208 default: 1209 return (ENOTTY); 1210 } 1211 } 1212 1213 /* 1214 * xdf interrupt handler 1215 */ 1216 static uint_t 1217 xdf_intr(caddr_t arg) 1218 { 1219 xdf_t *vdp = (xdf_t *)arg; 1220 xendev_ring_t *xbr; 1221 blkif_response_t *resp; 1222 int bioerr; 1223 uint64_t id; 1224 extern int do_polled_io; 1225 uint8_t op; 1226 uint16_t status; 1227 ddi_acc_handle_t acchdl; 1228 1229 mutex_enter(&vdp->xdf_dev_lk); 1230 1231 if ((xbr = vdp->xdf_xb_ring) == NULL) { 1232 mutex_exit(&vdp->xdf_dev_lk); 1233 return (DDI_INTR_UNCLAIMED); 1234 } 1235 1236 acchdl = vdp->xdf_xb_ring_hdl; 1237 1238 /* 1239 * complete all requests which have a response 1240 */ 1241 while (resp = xvdi_ring_get_response(xbr)) { 1242 id = ddi_get64(acchdl, &resp->id); 1243 op = ddi_get8(acchdl, &resp->operation); 1244 status = ddi_get16(acchdl, (uint16_t *)&resp->status); 1245 DPRINTF(INTR_DBG, ("resp: op %d id %"PRIu64" status %d\n", 1246 op, id, status)); 1247 1248 /* 1249 * XXPV - close connection to the backend and restart 1250 */ 1251 if (status != BLKIF_RSP_OKAY) { 1252 DPRINTF(IO_DBG, ("xdf@%s: I/O error while %s", 1253 ddi_get_name_addr(vdp->xdf_dip), 1254 (op == BLKIF_OP_READ) ? "reading" : "writing")); 1255 bioerr = EIO; 1256 } else { 1257 bioerr = 0; 1258 } 1259 1260 xdf_iofini(vdp, id, bioerr); 1261 } 1262 1263 mutex_exit(&vdp->xdf_dev_lk); 1264 1265 if (!do_polled_io) 1266 xdf_iostart(vdp); 1267 1268 return (DDI_INTR_CLAIMED); 1269 } 1270 1271 int xdf_fbrewrites; /* how many times was our flush block rewritten */ 1272 1273 /* 1274 * Snarf new data if our flush block was re-written 1275 */ 1276 static void 1277 check_fbwrite(xdf_t *vdp, buf_t *bp, daddr_t blkno) 1278 { 1279 int nblks; 1280 boolean_t mapin; 1281 1282 if (IS_WRITE_BARRIER(vdp, bp)) 1283 return; /* write was a flush write */ 1284 1285 mapin = B_FALSE; 1286 nblks = bp->b_bcount >> DEV_BSHIFT; 1287 if (xdf_flush_block >= blkno && xdf_flush_block < (blkno + nblks)) { 1288 xdf_fbrewrites++; 1289 if (bp->b_flags & (B_PAGEIO | B_PHYS)) { 1290 mapin = B_TRUE; 1291 bp_mapin(bp); 1292 } 1293 bcopy(bp->b_un.b_addr + 1294 ((xdf_flush_block - blkno) << DEV_BSHIFT), 1295 vdp->xdf_cache_flush_block, DEV_BSIZE); 1296 if (mapin) 1297 bp_mapout(bp); 1298 } 1299 } 1300 1301 static void 1302 xdf_iofini(xdf_t *vdp, uint64_t id, int bioerr) 1303 { 1304 ge_slot_t *gs = (ge_slot_t *)(uintptr_t)id; 1305 v_req_t *vreq = gs->vreq; 1306 buf_t *bp = vreq->v_buf; 1307 1308 gs_free(vdp, gs); 1309 if (bioerr) 1310 bioerror(bp, bioerr); 1311 vreq->v_nslots--; 1312 if (vreq->v_nslots != 0) 1313 return; 1314 1315 XDF_UPDATE_IO_STAT(vdp, bp); 1316 if (vdp->xdf_xdev_iostat != NULL) 1317 kstat_runq_exit(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1318 1319 if (IS_ERROR(bp)) 1320 bp->b_resid = bp->b_bcount; 1321 1322 vreq_free(vdp, vreq); 1323 biodone(bp); 1324 } 1325 1326 /* 1327 * return value of xdf_prepare_rreq() 1328 * used in xdf_iostart() 1329 */ 1330 #define XF_PARTIAL 0 /* rreq is full, not all I/O in buf transferred */ 1331 #define XF_COMP 1 /* no more I/O left in buf */ 1332 1333 static void 1334 xdf_iostart(xdf_t *vdp) 1335 { 1336 xendev_ring_t *xbr; 1337 struct buf *bp; 1338 blkif_request_t *rreq; 1339 int retval; 1340 int rreqready = 0; 1341 1342 xbr = vdp->xdf_xb_ring; 1343 1344 /* 1345 * populate the ring request(s) 1346 * 1347 * loop until there is no buf to transfer or no free slot 1348 * available in I/O ring 1349 */ 1350 mutex_enter(&vdp->xdf_dev_lk); 1351 1352 for (;;) { 1353 if (vdp->xdf_status != XD_READY) 1354 break; 1355 1356 /* active buf queue empty? */ 1357 if ((bp = vdp->xdf_f_act) == NULL) 1358 break; 1359 1360 /* try to grab a vreq for this bp */ 1361 if ((BP2VREQ(bp) == NULL) && (vreq_get(vdp, bp) == NULL)) 1362 break; 1363 /* alloc DMA/GTE resources */ 1364 if (vreq_setup(vdp, BP2VREQ(bp)) != DDI_SUCCESS) 1365 break; 1366 1367 /* get next blkif_request in the ring */ 1368 if ((rreq = xvdi_ring_get_request(xbr)) == NULL) 1369 break; 1370 bzero(rreq, sizeof (blkif_request_t)); 1371 1372 /* populate blkif_request with this buf */ 1373 rreqready++; 1374 retval = xdf_prepare_rreq(vdp, bp, rreq); 1375 if (retval == XF_COMP) { 1376 /* finish this bp, switch to next one */ 1377 if (vdp->xdf_xdev_iostat != NULL) 1378 kstat_waitq_to_runq( 1379 KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1380 vdp->xdf_f_act = bp->av_forw; 1381 bp->av_forw = NULL; 1382 } 1383 } 1384 1385 /* 1386 * Send the request(s) to the backend 1387 */ 1388 if (rreqready) { 1389 if (xvdi_ring_push_request(xbr)) { 1390 DPRINTF(IO_DBG, ("xdf_iostart: " 1391 "sent request(s) to backend\n")); 1392 xvdi_notify_oe(vdp->xdf_dip); 1393 } 1394 } 1395 1396 mutex_exit(&vdp->xdf_dev_lk); 1397 } 1398 1399 /* 1400 * populate a single blkif_request_t w/ a buf 1401 */ 1402 static int 1403 xdf_prepare_rreq(xdf_t *vdp, struct buf *bp, blkif_request_t *rreq) 1404 { 1405 int rval; 1406 grant_ref_t gr; 1407 uint8_t fsect, lsect; 1408 size_t bcnt; 1409 paddr_t dma_addr; 1410 off_t blk_off; 1411 dev_info_t *dip = vdp->xdf_dip; 1412 blkif_vdev_t vdev = xvdi_get_vdevnum(dip); 1413 v_req_t *vreq = BP2VREQ(bp); 1414 uint64_t blkno = vreq->v_blkno; 1415 uint_t ndmacs = vreq->v_ndmacs; 1416 ddi_acc_handle_t acchdl = vdp->xdf_xb_ring_hdl; 1417 int seg = 0; 1418 int isread = IS_READ(bp); 1419 1420 if (isread) 1421 ddi_put8(acchdl, &rreq->operation, BLKIF_OP_READ); 1422 else { 1423 switch (vreq->v_flush_diskcache) { 1424 case FLUSH_DISKCACHE: 1425 ddi_put8(acchdl, &rreq->operation, 1426 BLKIF_OP_FLUSH_DISKCACHE); 1427 ddi_put16(acchdl, &rreq->handle, vdev); 1428 ddi_put64(acchdl, &rreq->id, 1429 (uint64_t)(uintptr_t)(vreq->v_gs)); 1430 ddi_put8(acchdl, &rreq->nr_segments, 0); 1431 return (XF_COMP); 1432 case WRITE_BARRIER: 1433 ddi_put8(acchdl, &rreq->operation, 1434 BLKIF_OP_WRITE_BARRIER); 1435 break; 1436 default: 1437 if (!vdp->xdf_wce) 1438 ddi_put8(acchdl, &rreq->operation, 1439 BLKIF_OP_WRITE_BARRIER); 1440 else 1441 ddi_put8(acchdl, &rreq->operation, 1442 BLKIF_OP_WRITE); 1443 break; 1444 } 1445 } 1446 1447 ddi_put16(acchdl, &rreq->handle, vdev); 1448 ddi_put64(acchdl, &rreq->sector_number, blkno); 1449 ddi_put64(acchdl, &rreq->id, (uint64_t)(uintptr_t)(vreq->v_gs)); 1450 1451 /* 1452 * loop until all segments are populated or no more dma cookie in buf 1453 */ 1454 for (;;) { 1455 /* 1456 * Each segment of a blkif request can transfer up to 1457 * one 4K page of data. 1458 */ 1459 bcnt = vreq->v_dmac.dmac_size; 1460 ASSERT(bcnt <= PAGESIZE); 1461 ASSERT((bcnt % XB_BSIZE) == 0); 1462 dma_addr = vreq->v_dmac.dmac_laddress; 1463 blk_off = (uint_t)((paddr_t)XB_SEGOFFSET & dma_addr); 1464 ASSERT((blk_off & XB_BMASK) == 0); 1465 fsect = blk_off >> XB_BSHIFT; 1466 lsect = fsect + (bcnt >> XB_BSHIFT) - 1; 1467 ASSERT(fsect < XB_MAX_SEGLEN / XB_BSIZE && 1468 lsect < XB_MAX_SEGLEN / XB_BSIZE); 1469 DPRINTF(IO_DBG, (" ""seg%d: dmacS %lu blk_off %ld\n", 1470 seg, vreq->v_dmac.dmac_size, blk_off)); 1471 gr = gs_grant(vreq->v_gs, PATOMA(dma_addr) >> PAGESHIFT); 1472 ddi_put32(acchdl, &rreq->seg[seg].gref, gr); 1473 ddi_put8(acchdl, &rreq->seg[seg].first_sect, fsect); 1474 ddi_put8(acchdl, &rreq->seg[seg].last_sect, lsect); 1475 DPRINTF(IO_DBG, (" ""seg%d: fs %d ls %d gr %d dma 0x%"PRIx64 1476 "\n", seg, fsect, lsect, gr, dma_addr)); 1477 1478 blkno += (bcnt >> XB_BSHIFT); 1479 seg++; 1480 ASSERT(seg <= BLKIF_MAX_SEGMENTS_PER_REQUEST); 1481 if (--ndmacs) { 1482 ddi_dma_nextcookie(vreq->v_dmahdl, &vreq->v_dmac); 1483 continue; 1484 } 1485 1486 vreq->v_status = VREQ_DMAWIN_DONE; 1487 vreq->v_blkno = blkno; 1488 if (vreq->v_dmaw + 1 == vreq->v_ndmaws) 1489 /* last win */ 1490 rval = XF_COMP; 1491 else 1492 rval = XF_PARTIAL; 1493 break; 1494 } 1495 ddi_put8(acchdl, &rreq->nr_segments, seg); 1496 DPRINTF(IO_DBG, ("xdf_prepare_rreq: request id=%"PRIx64" ready\n", 1497 rreq->id)); 1498 1499 return (rval); 1500 } 1501 1502 #define XDF_QSEC 50000 /* .005 second */ 1503 #define XDF_POLLCNT 12 /* loop for 12 times before time out */ 1504 1505 static int 1506 xdf_drain_io(xdf_t *vdp) 1507 { 1508 int pollc, rval; 1509 xendev_ring_t *xbr; 1510 1511 if (xdfdebug & SUSRES_DBG) 1512 xen_printf("xdf_drain_io: start\n"); 1513 1514 mutex_enter(&vdp->xdf_dev_lk); 1515 1516 if ((vdp->xdf_status != XD_READY) && (vdp->xdf_status != XD_SUSPEND)) 1517 goto out; 1518 1519 rval = 0; 1520 xbr = vdp->xdf_xb_ring; 1521 ASSERT(xbr != NULL); 1522 1523 for (pollc = 0; pollc < XDF_POLLCNT; pollc++) { 1524 if (xvdi_ring_has_unconsumed_responses(xbr)) { 1525 mutex_exit(&vdp->xdf_dev_lk); 1526 (void) xdf_intr((caddr_t)vdp); 1527 mutex_enter(&vdp->xdf_dev_lk); 1528 } 1529 if (!xvdi_ring_has_incomp_request(xbr)) 1530 goto out; 1531 1532 #ifndef XPV_HVM_DRIVER 1533 (void) HYPERVISOR_yield(); 1534 #endif /* XPV_HVM_DRIVER */ 1535 /* 1536 * file-backed devices can be slow 1537 */ 1538 drv_usecwait(XDF_QSEC << pollc); 1539 } 1540 cmn_err(CE_WARN, "xdf_polled_io: timeout"); 1541 rval = EIO; 1542 out: 1543 mutex_exit(&vdp->xdf_dev_lk); 1544 if (xdfdebug & SUSRES_DBG) 1545 xen_printf("xdf_drain_io: end, err=%d\n", rval); 1546 return (rval); 1547 } 1548 1549 /* ARGSUSED5 */ 1550 int 1551 xdf_lb_rdwr(dev_info_t *devi, uchar_t cmd, void *bufp, 1552 diskaddr_t start, size_t reqlen, void *tg_cookie) 1553 { 1554 xdf_t *vdp; 1555 struct buf *bp; 1556 int err = 0; 1557 1558 vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)); 1559 if (vdp == NULL) 1560 return (ENXIO); 1561 1562 if ((start + (reqlen >> DEV_BSHIFT)) > vdp->xdf_pgeom.g_capacity) 1563 return (EINVAL); 1564 1565 bp = getrbuf(KM_SLEEP); 1566 if (cmd == TG_READ) 1567 bp->b_flags = B_BUSY | B_READ; 1568 else 1569 bp->b_flags = B_BUSY | B_WRITE; 1570 bp->b_un.b_addr = bufp; 1571 bp->b_bcount = reqlen; 1572 bp->b_blkno = start; 1573 bp->b_edev = DDI_DEV_T_NONE; /* don't have dev_t */ 1574 1575 mutex_enter(&vdp->xdf_dev_lk); 1576 if (vdp->xdf_xdev_iostat != NULL) 1577 kstat_waitq_enter(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1578 if (vdp->xdf_f_act == NULL) { 1579 vdp->xdf_f_act = vdp->xdf_l_act = bp; 1580 } else { 1581 vdp->xdf_l_act->av_forw = bp; 1582 vdp->xdf_l_act = bp; 1583 } 1584 mutex_exit(&vdp->xdf_dev_lk); 1585 xdf_iostart(vdp); 1586 err = biowait(bp); 1587 1588 ASSERT(bp->b_flags & B_DONE); 1589 1590 freerbuf(bp); 1591 return (err); 1592 } 1593 1594 /* 1595 * synthetic geometry 1596 */ 1597 #define XDF_NSECTS 256 1598 #define XDF_NHEADS 16 1599 1600 static void 1601 xdf_synthetic_pgeom(dev_info_t *devi, cmlb_geom_t *geomp) 1602 { 1603 xdf_t *vdp; 1604 uint_t ncyl; 1605 1606 vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)); 1607 1608 ncyl = vdp->xdf_xdev_nblocks / (XDF_NHEADS * XDF_NSECTS); 1609 1610 geomp->g_ncyl = ncyl == 0 ? 1 : ncyl; 1611 geomp->g_acyl = 0; 1612 geomp->g_nhead = XDF_NHEADS; 1613 geomp->g_secsize = XB_BSIZE; 1614 geomp->g_nsect = XDF_NSECTS; 1615 geomp->g_intrlv = 0; 1616 geomp->g_rpm = 7200; 1617 geomp->g_capacity = vdp->xdf_xdev_nblocks; 1618 } 1619 1620 static int 1621 xdf_lb_getcap(dev_info_t *devi, diskaddr_t *capp) 1622 { 1623 xdf_t *vdp; 1624 1625 vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)); 1626 1627 if (vdp == NULL) 1628 return (ENXIO); 1629 1630 mutex_enter(&vdp->xdf_dev_lk); 1631 *capp = vdp->xdf_pgeom.g_capacity; 1632 DPRINTF(LBL_DBG, ("capacity %llu\n", *capp)); 1633 mutex_exit(&vdp->xdf_dev_lk); 1634 return (0); 1635 } 1636 1637 static int 1638 xdf_lb_getpgeom(dev_info_t *devi, cmlb_geom_t *geomp) 1639 { 1640 xdf_t *vdp; 1641 1642 if ((vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi))) == NULL) 1643 return (ENXIO); 1644 *geomp = vdp->xdf_pgeom; 1645 return (0); 1646 } 1647 1648 /* 1649 * No real HBA, no geometry available from it 1650 */ 1651 /*ARGSUSED*/ 1652 static int 1653 xdf_lb_getvgeom(dev_info_t *devi, cmlb_geom_t *geomp) 1654 { 1655 return (EINVAL); 1656 } 1657 1658 static int 1659 xdf_lb_getattribute(dev_info_t *devi, tg_attribute_t *tgattributep) 1660 { 1661 xdf_t *vdp; 1662 1663 if (!(vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)))) 1664 return (ENXIO); 1665 1666 if (XD_IS_RO(vdp)) 1667 tgattributep->media_is_writable = 0; 1668 else 1669 tgattributep->media_is_writable = 1; 1670 return (0); 1671 } 1672 1673 /* ARGSUSED3 */ 1674 int 1675 xdf_lb_getinfo(dev_info_t *devi, int cmd, void *arg, void *tg_cookie) 1676 { 1677 switch (cmd) { 1678 case TG_GETPHYGEOM: 1679 return (xdf_lb_getpgeom(devi, (cmlb_geom_t *)arg)); 1680 case TG_GETVIRTGEOM: 1681 return (xdf_lb_getvgeom(devi, (cmlb_geom_t *)arg)); 1682 case TG_GETCAPACITY: 1683 return (xdf_lb_getcap(devi, (diskaddr_t *)arg)); 1684 case TG_GETBLOCKSIZE: 1685 *(uint32_t *)arg = XB_BSIZE; 1686 return (0); 1687 case TG_GETATTR: 1688 return (xdf_lb_getattribute(devi, (tg_attribute_t *)arg)); 1689 default: 1690 return (ENOTTY); 1691 } 1692 } 1693 1694 /* 1695 * Kick-off connect process 1696 * Status should be XD_UNKNOWN or XD_CLOSED 1697 * On success, status will be changed to XD_INIT 1698 * On error, status won't be changed 1699 */ 1700 static int 1701 xdf_start_connect(xdf_t *vdp) 1702 { 1703 char *xsnode; 1704 grant_ref_t gref; 1705 xenbus_transaction_t xbt; 1706 int rv; 1707 dev_info_t *dip = vdp->xdf_dip; 1708 1709 if ((vdp->xdf_peer = xvdi_get_oeid(dip)) == (domid_t)-1) 1710 goto errout; 1711 1712 if (xvdi_alloc_evtchn(dip) != DDI_SUCCESS) { 1713 cmn_err(CE_WARN, "xdf@%s: failed to alloc event channel", 1714 ddi_get_name_addr(dip)); 1715 goto errout; 1716 } 1717 vdp->xdf_evtchn = xvdi_get_evtchn(dip); 1718 #ifdef XPV_HVM_DRIVER 1719 ec_bind_evtchn_to_handler(vdp->xdf_evtchn, IPL_VBD, xdf_intr, vdp); 1720 #else /* !XPV_HVM_DRIVER */ 1721 if (ddi_add_intr(dip, 0, NULL, NULL, xdf_intr, (caddr_t)vdp) != 1722 DDI_SUCCESS) { 1723 cmn_err(CE_WARN, "xdf_start_connect: xdf@%s: " 1724 "failed to add intr handler", ddi_get_name_addr(dip)); 1725 goto errout1; 1726 } 1727 #endif /* !XPV_HVM_DRIVER */ 1728 1729 if (xvdi_alloc_ring(dip, BLKIF_RING_SIZE, 1730 sizeof (union blkif_sring_entry), &gref, &vdp->xdf_xb_ring) != 1731 DDI_SUCCESS) { 1732 cmn_err(CE_WARN, "xdf@%s: failed to alloc comm ring", 1733 ddi_get_name_addr(dip)); 1734 goto errout2; 1735 } 1736 vdp->xdf_xb_ring_hdl = vdp->xdf_xb_ring->xr_acc_hdl; /* ugly!! */ 1737 1738 /* 1739 * Write into xenstore the info needed by backend 1740 */ 1741 if ((xsnode = xvdi_get_xsname(dip)) == NULL) { 1742 cmn_err(CE_WARN, "xdf@%s: " 1743 "failed to get xenstore node path", 1744 ddi_get_name_addr(dip)); 1745 goto fail_trans; 1746 } 1747 trans_retry: 1748 if (xenbus_transaction_start(&xbt)) { 1749 cmn_err(CE_WARN, "xdf@%s: failed to start transaction", 1750 ddi_get_name_addr(dip)); 1751 xvdi_fatal_error(dip, EIO, "transaction start"); 1752 goto fail_trans; 1753 } 1754 1755 if (rv = xenbus_printf(xbt, xsnode, "ring-ref", "%u", gref)) { 1756 cmn_err(CE_WARN, "xdf@%s: failed to write ring-ref", 1757 ddi_get_name_addr(dip)); 1758 xvdi_fatal_error(dip, rv, "writing ring-ref"); 1759 goto abort_trans; 1760 } 1761 1762 if (rv = xenbus_printf(xbt, xsnode, "event-channel", "%u", 1763 vdp->xdf_evtchn)) { 1764 cmn_err(CE_WARN, "xdf@%s: failed to write event-channel", 1765 ddi_get_name_addr(dip)); 1766 xvdi_fatal_error(dip, rv, "writing event-channel"); 1767 goto abort_trans; 1768 } 1769 1770 /* 1771 * "protocol" is written by the domain builder in the case of PV 1772 * domains. However, it is not written for HVM domains, so let's 1773 * write it here. 1774 */ 1775 if (rv = xenbus_printf(xbt, xsnode, "protocol", "%s", 1776 XEN_IO_PROTO_ABI_NATIVE)) { 1777 cmn_err(CE_WARN, "xdf@%s: failed to write protocol", 1778 ddi_get_name_addr(dip)); 1779 xvdi_fatal_error(dip, rv, "writing protocol"); 1780 goto abort_trans; 1781 } 1782 1783 if ((rv = xvdi_switch_state(dip, xbt, XenbusStateInitialised)) > 0) { 1784 cmn_err(CE_WARN, "xdf@%s: " 1785 "failed to switch state to XenbusStateInitialised", 1786 ddi_get_name_addr(dip)); 1787 xvdi_fatal_error(dip, rv, "writing state"); 1788 goto abort_trans; 1789 } 1790 1791 /* kick-off connect process */ 1792 if (rv = xenbus_transaction_end(xbt, 0)) { 1793 if (rv == EAGAIN) 1794 goto trans_retry; 1795 cmn_err(CE_WARN, "xdf@%s: failed to end transaction", 1796 ddi_get_name_addr(dip)); 1797 xvdi_fatal_error(dip, rv, "completing transaction"); 1798 goto fail_trans; 1799 } 1800 1801 ASSERT(mutex_owned(&vdp->xdf_cb_lk)); 1802 mutex_enter(&vdp->xdf_dev_lk); 1803 vdp->xdf_status = XD_INIT; 1804 mutex_exit(&vdp->xdf_dev_lk); 1805 1806 return (DDI_SUCCESS); 1807 1808 abort_trans: 1809 (void) xenbus_transaction_end(xbt, 1); 1810 fail_trans: 1811 xvdi_free_ring(vdp->xdf_xb_ring); 1812 errout2: 1813 #ifdef XPV_HVM_DRIVER 1814 ec_unbind_evtchn(vdp->xdf_evtchn); 1815 #else /* !XPV_HVM_DRIVER */ 1816 (void) ddi_remove_intr(vdp->xdf_dip, 0, NULL); 1817 #endif /* !XPV_HVM_DRIVER */ 1818 errout1: 1819 xvdi_free_evtchn(dip); 1820 errout: 1821 cmn_err(CE_WARN, "xdf@%s: fail to kick-off connecting", 1822 ddi_get_name_addr(dip)); 1823 return (DDI_FAILURE); 1824 } 1825 1826 /* 1827 * Kick-off disconnect process 1828 * Status won't be changed 1829 */ 1830 static int 1831 xdf_start_disconnect(xdf_t *vdp) 1832 { 1833 if (xvdi_switch_state(vdp->xdf_dip, XBT_NULL, XenbusStateClosed) > 0) { 1834 cmn_err(CE_WARN, "xdf@%s: fail to kick-off disconnecting", 1835 ddi_get_name_addr(vdp->xdf_dip)); 1836 return (DDI_FAILURE); 1837 } 1838 1839 return (DDI_SUCCESS); 1840 } 1841 1842 int 1843 xdf_get_flush_block(xdf_t *vdp) 1844 { 1845 /* 1846 * Get a DEV_BSIZE aligned bufer 1847 */ 1848 vdp->xdf_flush_mem = kmem_alloc(DEV_BSIZE * 2, KM_SLEEP); 1849 vdp->xdf_cache_flush_block = 1850 (char *)P2ROUNDUP((uintptr_t)(vdp->xdf_flush_mem), DEV_BSIZE); 1851 if (xdf_lb_rdwr(vdp->xdf_dip, TG_READ, vdp->xdf_cache_flush_block, 1852 xdf_flush_block, DEV_BSIZE, NULL) != 0) 1853 return (DDI_FAILURE); 1854 return (DDI_SUCCESS); 1855 } 1856 1857 /* 1858 * Finish other initialization after we've connected to backend 1859 * Status should be XD_INIT before calling this routine 1860 * On success, status should be changed to XD_READY 1861 * On error, status should stay XD_INIT 1862 */ 1863 static int 1864 xdf_post_connect(xdf_t *vdp) 1865 { 1866 int rv; 1867 uint_t len; 1868 char *type; 1869 char *barrier; 1870 dev_info_t *devi = vdp->xdf_dip; 1871 1872 /* 1873 * Determine if feature barrier is supported by backend 1874 */ 1875 if (xenbus_read(XBT_NULL, xvdi_get_oename(devi), 1876 "feature-barrier", (void **)&barrier, &len) == 0) { 1877 vdp->xdf_feature_barrier = 1; 1878 kmem_free(barrier, len); 1879 } else { 1880 cmn_err(CE_NOTE, "xdf@%s: failed to read feature-barrier", 1881 ddi_get_name_addr(vdp->xdf_dip)); 1882 vdp->xdf_feature_barrier = 0; 1883 } 1884 1885 /* probe backend */ 1886 if (rv = xenbus_gather(XBT_NULL, xvdi_get_oename(devi), 1887 "sectors", "%"SCNu64, &vdp->xdf_xdev_nblocks, 1888 "info", "%u", &vdp->xdf_xdev_info, NULL)) { 1889 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1890 "cannot read backend info", ddi_get_name_addr(devi)); 1891 xvdi_fatal_error(devi, rv, "reading backend info"); 1892 return (DDI_FAILURE); 1893 } 1894 1895 /* 1896 * Make sure that the device we're connecting isn't smaller than 1897 * the old connected device. 1898 */ 1899 if (vdp->xdf_xdev_nblocks < vdp->xdf_pgeom.g_capacity) { 1900 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1901 "backend disk device shrank", ddi_get_name_addr(devi)); 1902 /* XXX: call xvdi_fatal_error() here? */ 1903 xvdi_fatal_error(devi, rv, "reading backend info"); 1904 return (DDI_FAILURE); 1905 } 1906 1907 /* 1908 * Only update the physical geometry to reflect the new device 1909 * size if this is the first time we're connecting to the backend 1910 * device. Once we assign a physical geometry to a device it stays 1911 * fixed until: 1912 * - we get detach and re-attached (at which point we 1913 * automatically assign a new physical geometry). 1914 * - someone calls TG_SETPHYGEOM to explicity set the 1915 * physical geometry. 1916 */ 1917 if (vdp->xdf_pgeom.g_capacity == 0) 1918 xdf_synthetic_pgeom(devi, &vdp->xdf_pgeom); 1919 1920 /* fix disk type */ 1921 if (xenbus_read(XBT_NULL, xvdi_get_xsname(devi), "device-type", 1922 (void **)&type, &len) != 0) { 1923 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1924 "cannot read device-type", ddi_get_name_addr(devi)); 1925 xvdi_fatal_error(devi, rv, "reading device-type"); 1926 return (DDI_FAILURE); 1927 } 1928 if (strcmp(type, "cdrom") == 0) 1929 vdp->xdf_xdev_info |= VDISK_CDROM; 1930 kmem_free(type, len); 1931 1932 /* 1933 * We've created all the minor nodes via cmlb_attach() using default 1934 * value in xdf_attach() to make it possible to block in xdf_open(), 1935 * in case there's anyone (say, booting thread) ever trying to open 1936 * it before connected to backend. We will refresh all those minor 1937 * nodes w/ latest info we've got now when we are almost connected. 1938 * 1939 * Don't do this when xdf is already opened by someone (could happen 1940 * during resume), for that cmlb_attach() will invalid the label info 1941 * and confuse those who has already opened the node, which is bad. 1942 */ 1943 if (!xdf_isopen(vdp, -1) && (XD_IS_CD(vdp) || XD_IS_RM(vdp))) { 1944 /* re-init cmlb w/ latest info we got from backend */ 1945 if (cmlb_attach(devi, &xdf_lb_ops, 1946 XD_IS_CD(vdp) ? DTYPE_RODIRECT : DTYPE_DIRECT, 1947 XD_IS_RM(vdp), 1, DDI_NT_BLOCK, 1948 #if defined(XPV_HVM_DRIVER) 1949 CMLB_CREATE_ALTSLICE_VTOC_16_DTYPE_DIRECT | 1950 CMLB_INTERNAL_MINOR_NODES, 1951 #else /* !XPV_HVM_DRIVER */ 1952 CMLB_FAKE_LABEL_ONE_PARTITION, 1953 #endif /* !XPV_HVM_DRIVER */ 1954 vdp->xdf_vd_lbl, NULL) != 0) { 1955 cmn_err(CE_WARN, "xdf@%s: cmlb attach failed", 1956 ddi_get_name_addr(devi)); 1957 return (DDI_FAILURE); 1958 } 1959 } 1960 1961 /* mark vbd is ready for I/O */ 1962 ASSERT(mutex_owned(&vdp->xdf_cb_lk)); 1963 mutex_enter(&vdp->xdf_dev_lk); 1964 vdp->xdf_status = XD_READY; 1965 mutex_exit(&vdp->xdf_dev_lk); 1966 /* 1967 * If backend has feature-barrier, see if it supports disk 1968 * cache flush op. 1969 */ 1970 vdp->xdf_flush_supported = 0; 1971 if (vdp->xdf_feature_barrier) { 1972 /* 1973 * Pretend we already know flush is supported so probe 1974 * will attempt the correct op. 1975 */ 1976 vdp->xdf_flush_supported = 1; 1977 if (xdf_lb_rdwr(vdp->xdf_dip, TG_WRITE, NULL, 0, 0, 0) == 0) { 1978 vdp->xdf_flush_supported = 1; 1979 } else { 1980 vdp->xdf_flush_supported = 0; 1981 /* 1982 * If the other end does not support the cache flush op 1983 * then we must use a barrier-write to force disk 1984 * cache flushing. Barrier writes require that a data 1985 * block actually be written. 1986 * Cache a block to barrier-write when we are 1987 * asked to perform a flush. 1988 * XXX - would it be better to just copy 1 block 1989 * (512 bytes) from whatever write we did last 1990 * and rewrite that block? 1991 */ 1992 if (xdf_get_flush_block(vdp) != DDI_SUCCESS) 1993 return (DDI_FAILURE); 1994 } 1995 } 1996 1997 cmn_err(CE_CONT, "?xdf@%s: %"PRIu64" blocks", ddi_get_name_addr(devi), 1998 (uint64_t)vdp->xdf_xdev_nblocks); 1999 2000 return (DDI_SUCCESS); 2001 } 2002 2003 /* 2004 * Finish other uninitialization after we've disconnected from backend 2005 * when status is XD_CLOSING or XD_INIT. After returns, status is XD_CLOSED 2006 */ 2007 static void 2008 xdf_post_disconnect(xdf_t *vdp) 2009 { 2010 #ifdef XPV_HVM_DRIVER 2011 ec_unbind_evtchn(vdp->xdf_evtchn); 2012 #else /* !XPV_HVM_DRIVER */ 2013 (void) ddi_remove_intr(vdp->xdf_dip, 0, NULL); 2014 #endif /* !XPV_HVM_DRIVER */ 2015 xvdi_free_evtchn(vdp->xdf_dip); 2016 xvdi_free_ring(vdp->xdf_xb_ring); 2017 vdp->xdf_xb_ring = NULL; 2018 vdp->xdf_xb_ring_hdl = NULL; 2019 vdp->xdf_peer = (domid_t)-1; 2020 2021 ASSERT(mutex_owned(&vdp->xdf_cb_lk)); 2022 mutex_enter(&vdp->xdf_dev_lk); 2023 vdp->xdf_status = XD_CLOSED; 2024 mutex_exit(&vdp->xdf_dev_lk); 2025 } 2026 2027 /*ARGSUSED*/ 2028 static void 2029 xdf_oe_change(dev_info_t *dip, ddi_eventcookie_t id, void *arg, void *impl_data) 2030 { 2031 XenbusState new_state = *(XenbusState *)impl_data; 2032 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2033 boolean_t unexpect_die = B_FALSE; 2034 int status; 2035 2036 DPRINTF(DDI_DBG, ("xdf@%s: otherend state change to %d!\n", 2037 ddi_get_name_addr(dip), new_state)); 2038 2039 mutex_enter(&vdp->xdf_cb_lk); 2040 2041 if (xdf_check_state_transition(vdp, new_state) == DDI_FAILURE) { 2042 mutex_exit(&vdp->xdf_cb_lk); 2043 return; 2044 } 2045 2046 switch (new_state) { 2047 case XenbusStateInitialising: 2048 ASSERT(vdp->xdf_status == XD_CLOSED); 2049 /* 2050 * backend recovered from a previous failure, 2051 * kick-off connect process again 2052 */ 2053 if (xdf_start_connect(vdp) != DDI_SUCCESS) { 2054 cmn_err(CE_WARN, "xdf@%s:" 2055 " failed to start reconnecting to backend", 2056 ddi_get_name_addr(dip)); 2057 } 2058 break; 2059 case XenbusStateConnected: 2060 ASSERT(vdp->xdf_status == XD_INIT); 2061 (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateConnected); 2062 /* finish final init after connect */ 2063 if (xdf_post_connect(vdp) != DDI_SUCCESS) 2064 (void) xdf_start_disconnect(vdp); 2065 break; 2066 case XenbusStateClosing: 2067 if (vdp->xdf_status == XD_READY) { 2068 mutex_enter(&vdp->xdf_dev_lk); 2069 if (xdf_isopen(vdp, -1)) { 2070 cmn_err(CE_NOTE, "xdf@%s: hot-unplug failed, " 2071 "still in use", ddi_get_name_addr(dip)); 2072 mutex_exit(&vdp->xdf_dev_lk); 2073 break; 2074 } else { 2075 vdp->xdf_status = XD_CLOSING; 2076 } 2077 mutex_exit(&vdp->xdf_dev_lk); 2078 } 2079 (void) xdf_start_disconnect(vdp); 2080 break; 2081 case XenbusStateClosed: 2082 /* first check if BE closed unexpectedly */ 2083 mutex_enter(&vdp->xdf_dev_lk); 2084 if (xdf_isopen(vdp, -1)) { 2085 unexpect_die = B_TRUE; 2086 unexpectedie(vdp); 2087 cmn_err(CE_WARN, "xdf@%s: backend closed, " 2088 "reconnecting...", ddi_get_name_addr(dip)); 2089 } 2090 mutex_exit(&vdp->xdf_dev_lk); 2091 2092 if (vdp->xdf_status == XD_READY) { 2093 mutex_enter(&vdp->xdf_dev_lk); 2094 vdp->xdf_status = XD_CLOSING; 2095 mutex_exit(&vdp->xdf_dev_lk); 2096 2097 #ifdef DOMU_BACKEND 2098 (void) xvdi_post_event(dip, XEN_HP_REMOVE); 2099 #endif 2100 2101 xdf_post_disconnect(vdp); 2102 (void) xvdi_switch_state(dip, XBT_NULL, 2103 XenbusStateClosed); 2104 } else if ((vdp->xdf_status == XD_INIT) || 2105 (vdp->xdf_status == XD_CLOSING)) { 2106 xdf_post_disconnect(vdp); 2107 } else { 2108 mutex_enter(&vdp->xdf_dev_lk); 2109 vdp->xdf_status = XD_CLOSED; 2110 mutex_exit(&vdp->xdf_dev_lk); 2111 } 2112 } 2113 2114 /* notify anybody waiting for oe state change */ 2115 mutex_enter(&vdp->xdf_dev_lk); 2116 cv_broadcast(&vdp->xdf_dev_cv); 2117 mutex_exit(&vdp->xdf_dev_lk); 2118 2119 status = vdp->xdf_status; 2120 mutex_exit(&vdp->xdf_cb_lk); 2121 2122 if (status == XD_READY) { 2123 xdf_iostart(vdp); 2124 } else if ((status == XD_CLOSED) && !unexpect_die) { 2125 /* interface is closed successfully, remove all minor nodes */ 2126 cmlb_detach(vdp->xdf_vd_lbl, NULL); 2127 cmlb_free_handle(&vdp->xdf_vd_lbl); 2128 } 2129 } 2130 2131 /* check if partition is open, -1 - check all partitions on the disk */ 2132 static boolean_t 2133 xdf_isopen(xdf_t *vdp, int partition) 2134 { 2135 int i; 2136 ulong_t parbit; 2137 boolean_t rval = B_FALSE; 2138 2139 ASSERT((partition == -1) || 2140 ((partition >= 0) || (partition < XDF_PEXT))); 2141 2142 if (partition == -1) 2143 parbit = (ulong_t)-1; 2144 else 2145 parbit = 1 << partition; 2146 2147 for (i = 0; i < OTYPCNT; i++) { 2148 if (vdp->xdf_vd_open[i] & parbit) 2149 rval = B_TRUE; 2150 } 2151 2152 return (rval); 2153 } 2154 2155 /* 2156 * Xdf_check_state_transition will check the XenbusState change to see 2157 * if the change is a valid transition or not. 2158 * The new state is written by backend domain, or by running xenstore-write 2159 * to change it manually in dom0 2160 */ 2161 static int 2162 xdf_check_state_transition(xdf_t *vdp, XenbusState oestate) 2163 { 2164 int status; 2165 int stcheck; 2166 #define STOK 0 /* need further process */ 2167 #define STNOP 1 /* no action need taking */ 2168 #define STBUG 2 /* unexpected state change, could be a bug */ 2169 2170 status = vdp->xdf_status; 2171 stcheck = STOK; 2172 2173 switch (status) { 2174 case XD_UNKNOWN: 2175 if ((oestate == XenbusStateUnknown) || 2176 (oestate == XenbusStateConnected)) 2177 stcheck = STBUG; 2178 else if ((oestate == XenbusStateInitialising) || 2179 (oestate == XenbusStateInitWait) || 2180 (oestate == XenbusStateInitialised)) 2181 stcheck = STNOP; 2182 break; 2183 case XD_INIT: 2184 if (oestate == XenbusStateUnknown) 2185 stcheck = STBUG; 2186 else if ((oestate == XenbusStateInitialising) || 2187 (oestate == XenbusStateInitWait) || 2188 (oestate == XenbusStateInitialised)) 2189 stcheck = STNOP; 2190 break; 2191 case XD_READY: 2192 if ((oestate == XenbusStateUnknown) || 2193 (oestate == XenbusStateInitialising) || 2194 (oestate == XenbusStateInitWait) || 2195 (oestate == XenbusStateInitialised)) 2196 stcheck = STBUG; 2197 else if (oestate == XenbusStateConnected) 2198 stcheck = STNOP; 2199 break; 2200 case XD_CLOSING: 2201 if ((oestate == XenbusStateUnknown) || 2202 (oestate == XenbusStateInitialising) || 2203 (oestate == XenbusStateInitWait) || 2204 (oestate == XenbusStateInitialised) || 2205 (oestate == XenbusStateConnected)) 2206 stcheck = STBUG; 2207 else if (oestate == XenbusStateClosing) 2208 stcheck = STNOP; 2209 break; 2210 case XD_CLOSED: 2211 if ((oestate == XenbusStateUnknown) || 2212 (oestate == XenbusStateConnected)) 2213 stcheck = STBUG; 2214 else if ((oestate == XenbusStateInitWait) || 2215 (oestate == XenbusStateInitialised) || 2216 (oestate == XenbusStateClosing) || 2217 (oestate == XenbusStateClosed)) 2218 stcheck = STNOP; 2219 break; 2220 case XD_SUSPEND: 2221 default: 2222 stcheck = STBUG; 2223 } 2224 2225 if (stcheck == STOK) 2226 return (DDI_SUCCESS); 2227 2228 if (stcheck == STBUG) 2229 cmn_err(CE_NOTE, "xdf@%s: unexpected otherend " 2230 "state change to %d!, when status is %d", 2231 ddi_get_name_addr(vdp->xdf_dip), oestate, status); 2232 2233 return (DDI_FAILURE); 2234 } 2235 2236 static int 2237 xdf_connect(xdf_t *vdp, boolean_t wait) 2238 { 2239 ASSERT(mutex_owned(&vdp->xdf_dev_lk)); 2240 while (vdp->xdf_status != XD_READY) { 2241 if (!wait || (vdp->xdf_status > XD_READY)) 2242 break; 2243 2244 if (cv_wait_sig(&vdp->xdf_dev_cv, &vdp->xdf_dev_lk) == 0) 2245 break; 2246 } 2247 2248 return (vdp->xdf_status); 2249 } 2250 2251 /* 2252 * callback func when DMA/GTE resources is available 2253 * 2254 * Note: we only register one callback function to grant table subsystem 2255 * since we only have one 'struct gnttab_free_callback' in xdf_t. 2256 */ 2257 static int 2258 xdf_dmacallback(caddr_t arg) 2259 { 2260 xdf_t *vdp = (xdf_t *)arg; 2261 ASSERT(vdp != NULL); 2262 2263 DPRINTF(DMA_DBG, ("xdf@%s: DMA callback started\n", 2264 ddi_get_name_addr(vdp->xdf_dip))); 2265 2266 ddi_trigger_softintr(vdp->xdf_softintr_id); 2267 return (DDI_DMA_CALLBACK_DONE); 2268 } 2269 2270 static uint_t 2271 xdf_iorestart(caddr_t arg) 2272 { 2273 xdf_t *vdp = (xdf_t *)arg; 2274 2275 ASSERT(vdp != NULL); 2276 2277 mutex_enter(&vdp->xdf_dev_lk); 2278 ASSERT(ISDMACBON(vdp)); 2279 SETDMACBOFF(vdp); 2280 mutex_exit(&vdp->xdf_dev_lk); 2281 2282 xdf_iostart(vdp); 2283 2284 return (DDI_INTR_CLAIMED); 2285 } 2286 2287 static void 2288 xdf_timeout_handler(void *arg) 2289 { 2290 xdf_t *vdp = arg; 2291 2292 mutex_enter(&vdp->xdf_dev_lk); 2293 vdp->xdf_timeout_id = 0; 2294 mutex_exit(&vdp->xdf_dev_lk); 2295 2296 /* new timeout thread could be re-scheduled */ 2297 xdf_iostart(vdp); 2298 } 2299 2300 /* 2301 * Alloc a vreq for this bp 2302 * bp->av_back contains the pointer to the vreq upon return 2303 */ 2304 static v_req_t * 2305 vreq_get(xdf_t *vdp, buf_t *bp) 2306 { 2307 v_req_t *vreq = NULL; 2308 2309 ASSERT(BP2VREQ(bp) == NULL); 2310 2311 vreq = kmem_cache_alloc(xdf_vreq_cache, KM_NOSLEEP); 2312 if (vreq == NULL) { 2313 if (vdp->xdf_timeout_id == 0) 2314 /* restart I/O after one second */ 2315 vdp->xdf_timeout_id = 2316 timeout(xdf_timeout_handler, vdp, hz); 2317 return (NULL); 2318 } 2319 bzero(vreq, sizeof (v_req_t)); 2320 2321 list_insert_head(&vdp->xdf_vreq_act, (void *)vreq); 2322 bp->av_back = (buf_t *)vreq; 2323 vreq->v_buf = bp; 2324 vreq->v_status = VREQ_INIT; 2325 /* init of other fields in vreq is up to the caller */ 2326 2327 return (vreq); 2328 } 2329 2330 static void 2331 vreq_free(xdf_t *vdp, v_req_t *vreq) 2332 { 2333 buf_t *bp = vreq->v_buf; 2334 2335 list_remove(&vdp->xdf_vreq_act, (void *)vreq); 2336 2337 if (vreq->v_flush_diskcache == FLUSH_DISKCACHE) 2338 goto done; 2339 2340 switch (vreq->v_status) { 2341 case VREQ_DMAWIN_DONE: 2342 case VREQ_GS_ALLOCED: 2343 case VREQ_DMABUF_BOUND: 2344 (void) ddi_dma_unbind_handle(vreq->v_dmahdl); 2345 /*FALLTHRU*/ 2346 case VREQ_DMAMEM_ALLOCED: 2347 if (!ALIGNED_XFER(bp)) { 2348 ASSERT(vreq->v_abuf != NULL); 2349 if (!IS_ERROR(bp) && IS_READ(bp)) 2350 bcopy(vreq->v_abuf, bp->b_un.b_addr, 2351 bp->b_bcount); 2352 ddi_dma_mem_free(&vreq->v_align); 2353 } 2354 /*FALLTHRU*/ 2355 case VREQ_MEMDMAHDL_ALLOCED: 2356 if (!ALIGNED_XFER(bp)) 2357 ddi_dma_free_handle(&vreq->v_memdmahdl); 2358 /*FALLTHRU*/ 2359 case VREQ_DMAHDL_ALLOCED: 2360 ddi_dma_free_handle(&vreq->v_dmahdl); 2361 break; 2362 default: 2363 break; 2364 } 2365 done: 2366 vreq->v_buf->av_back = NULL; 2367 kmem_cache_free(xdf_vreq_cache, vreq); 2368 } 2369 2370 /* 2371 * Initalize the DMA and grant table resources for the buf 2372 */ 2373 static int 2374 vreq_setup(xdf_t *vdp, v_req_t *vreq) 2375 { 2376 int rc; 2377 ddi_dma_attr_t dmaattr; 2378 uint_t ndcs, ndws; 2379 ddi_dma_handle_t dh; 2380 ddi_dma_handle_t mdh; 2381 ddi_dma_cookie_t dc; 2382 ddi_acc_handle_t abh; 2383 caddr_t aba; 2384 ge_slot_t *gs; 2385 size_t bufsz; 2386 off_t off; 2387 size_t sz; 2388 buf_t *bp = vreq->v_buf; 2389 int dma_flags = (IS_READ(bp) ? DDI_DMA_READ : DDI_DMA_WRITE) | 2390 DDI_DMA_STREAMING | DDI_DMA_PARTIAL; 2391 2392 switch (vreq->v_status) { 2393 case VREQ_INIT: 2394 if (IS_FLUSH_DISKCACHE(bp)) { 2395 if ((gs = gs_get(vdp, IS_READ(bp))) == NULL) { 2396 DPRINTF(DMA_DBG, ( 2397 "xdf@%s: get ge_slotfailed\n", 2398 ddi_get_name_addr(vdp->xdf_dip))); 2399 return (DDI_FAILURE); 2400 } 2401 vreq->v_blkno = 0; 2402 vreq->v_nslots = 1; 2403 vreq->v_gs = gs; 2404 vreq->v_flush_diskcache = FLUSH_DISKCACHE; 2405 vreq->v_status = VREQ_GS_ALLOCED; 2406 gs->vreq = vreq; 2407 return (DDI_SUCCESS); 2408 } 2409 2410 if (IS_WRITE_BARRIER(vdp, bp)) 2411 vreq->v_flush_diskcache = WRITE_BARRIER; 2412 vreq->v_blkno = bp->b_blkno + 2413 (diskaddr_t)(uintptr_t)bp->b_private; 2414 bp->b_private = NULL; 2415 /* See if we wrote new data to our flush block */ 2416 if (!IS_READ(bp) && USE_WRITE_BARRIER(vdp)) 2417 check_fbwrite(vdp, bp, vreq->v_blkno); 2418 vreq->v_status = VREQ_INIT_DONE; 2419 /*FALLTHRU*/ 2420 2421 case VREQ_INIT_DONE: 2422 /* 2423 * alloc DMA handle 2424 */ 2425 rc = ddi_dma_alloc_handle(vdp->xdf_dip, &xb_dma_attr, 2426 xdf_dmacallback, (caddr_t)vdp, &dh); 2427 if (rc != DDI_SUCCESS) { 2428 SETDMACBON(vdp); 2429 DPRINTF(DMA_DBG, ("xdf@%s: DMA handle alloc failed\n", 2430 ddi_get_name_addr(vdp->xdf_dip))); 2431 return (DDI_FAILURE); 2432 } 2433 2434 vreq->v_dmahdl = dh; 2435 vreq->v_status = VREQ_DMAHDL_ALLOCED; 2436 /*FALLTHRU*/ 2437 2438 case VREQ_DMAHDL_ALLOCED: 2439 /* 2440 * alloc dma handle for 512-byte aligned buf 2441 */ 2442 if (!ALIGNED_XFER(bp)) { 2443 /* 2444 * XXPV: we need to temporarily enlarge the seg 2445 * boundary and s/g length to work round CR6381968 2446 */ 2447 dmaattr = xb_dma_attr; 2448 dmaattr.dma_attr_seg = (uint64_t)-1; 2449 dmaattr.dma_attr_sgllen = INT_MAX; 2450 rc = ddi_dma_alloc_handle(vdp->xdf_dip, &dmaattr, 2451 xdf_dmacallback, (caddr_t)vdp, &mdh); 2452 if (rc != DDI_SUCCESS) { 2453 SETDMACBON(vdp); 2454 DPRINTF(DMA_DBG, ("xdf@%s: unaligned buf DMA" 2455 "handle alloc failed\n", 2456 ddi_get_name_addr(vdp->xdf_dip))); 2457 return (DDI_FAILURE); 2458 } 2459 vreq->v_memdmahdl = mdh; 2460 vreq->v_status = VREQ_MEMDMAHDL_ALLOCED; 2461 } 2462 /*FALLTHRU*/ 2463 2464 case VREQ_MEMDMAHDL_ALLOCED: 2465 /* 2466 * alloc 512-byte aligned buf 2467 */ 2468 if (!ALIGNED_XFER(bp)) { 2469 if (bp->b_flags & (B_PAGEIO | B_PHYS)) 2470 bp_mapin(bp); 2471 2472 rc = ddi_dma_mem_alloc(vreq->v_memdmahdl, 2473 roundup(bp->b_bcount, XB_BSIZE), &xc_acc_attr, 2474 DDI_DMA_STREAMING, xdf_dmacallback, (caddr_t)vdp, 2475 &aba, &bufsz, &abh); 2476 if (rc != DDI_SUCCESS) { 2477 SETDMACBON(vdp); 2478 DPRINTF(DMA_DBG, ( 2479 "xdf@%s: DMA mem allocation failed\n", 2480 ddi_get_name_addr(vdp->xdf_dip))); 2481 return (DDI_FAILURE); 2482 } 2483 2484 vreq->v_abuf = aba; 2485 vreq->v_align = abh; 2486 vreq->v_status = VREQ_DMAMEM_ALLOCED; 2487 2488 ASSERT(bufsz >= bp->b_bcount); 2489 if (!IS_READ(bp)) 2490 bcopy(bp->b_un.b_addr, vreq->v_abuf, 2491 bp->b_bcount); 2492 } 2493 /*FALLTHRU*/ 2494 2495 case VREQ_DMAMEM_ALLOCED: 2496 /* 2497 * dma bind 2498 */ 2499 if (ALIGNED_XFER(bp)) { 2500 rc = ddi_dma_buf_bind_handle(vreq->v_dmahdl, bp, 2501 dma_flags, xdf_dmacallback, (caddr_t)vdp, 2502 &dc, &ndcs); 2503 } else { 2504 rc = ddi_dma_addr_bind_handle(vreq->v_dmahdl, 2505 NULL, vreq->v_abuf, bp->b_bcount, dma_flags, 2506 xdf_dmacallback, (caddr_t)vdp, &dc, &ndcs); 2507 } 2508 if (rc == DDI_DMA_MAPPED || rc == DDI_DMA_PARTIAL_MAP) { 2509 /* get num of dma windows */ 2510 if (rc == DDI_DMA_PARTIAL_MAP) { 2511 rc = ddi_dma_numwin(vreq->v_dmahdl, &ndws); 2512 ASSERT(rc == DDI_SUCCESS); 2513 } else { 2514 ndws = 1; 2515 } 2516 } else { 2517 SETDMACBON(vdp); 2518 DPRINTF(DMA_DBG, ("xdf@%s: DMA bind failed\n", 2519 ddi_get_name_addr(vdp->xdf_dip))); 2520 return (DDI_FAILURE); 2521 } 2522 2523 vreq->v_dmac = dc; 2524 vreq->v_dmaw = 0; 2525 vreq->v_ndmacs = ndcs; 2526 vreq->v_ndmaws = ndws; 2527 vreq->v_nslots = ndws; 2528 vreq->v_status = VREQ_DMABUF_BOUND; 2529 /*FALLTHRU*/ 2530 2531 case VREQ_DMABUF_BOUND: 2532 /* 2533 * get ge_slot, callback is set upon failure from gs_get(), 2534 * if not set previously 2535 */ 2536 if ((gs = gs_get(vdp, IS_READ(bp))) == NULL) { 2537 DPRINTF(DMA_DBG, ("xdf@%s: get ge_slot failed\n", 2538 ddi_get_name_addr(vdp->xdf_dip))); 2539 return (DDI_FAILURE); 2540 } 2541 2542 vreq->v_gs = gs; 2543 gs->vreq = vreq; 2544 vreq->v_status = VREQ_GS_ALLOCED; 2545 break; 2546 2547 case VREQ_GS_ALLOCED: 2548 /* nothing need to be done */ 2549 break; 2550 2551 case VREQ_DMAWIN_DONE: 2552 /* 2553 * move to the next dma window 2554 */ 2555 ASSERT((vreq->v_dmaw + 1) < vreq->v_ndmaws); 2556 2557 /* get a ge_slot for this DMA window */ 2558 if ((gs = gs_get(vdp, IS_READ(bp))) == NULL) { 2559 DPRINTF(DMA_DBG, ("xdf@%s: get ge_slot failed\n", 2560 ddi_get_name_addr(vdp->xdf_dip))); 2561 return (DDI_FAILURE); 2562 } 2563 2564 vreq->v_gs = gs; 2565 gs->vreq = vreq; 2566 vreq->v_dmaw++; 2567 rc = ddi_dma_getwin(vreq->v_dmahdl, vreq->v_dmaw, &off, &sz, 2568 &vreq->v_dmac, &vreq->v_ndmacs); 2569 ASSERT(rc == DDI_SUCCESS); 2570 vreq->v_status = VREQ_GS_ALLOCED; 2571 break; 2572 2573 default: 2574 return (DDI_FAILURE); 2575 } 2576 2577 return (DDI_SUCCESS); 2578 } 2579 2580 static ge_slot_t * 2581 gs_get(xdf_t *vdp, int isread) 2582 { 2583 grant_ref_t gh; 2584 ge_slot_t *gs; 2585 2586 /* try to alloc GTEs needed in this slot, first */ 2587 if (gnttab_alloc_grant_references( 2588 BLKIF_MAX_SEGMENTS_PER_REQUEST, &gh) == -1) { 2589 if (vdp->xdf_gnt_callback.next == NULL) { 2590 SETDMACBON(vdp); 2591 gnttab_request_free_callback( 2592 &vdp->xdf_gnt_callback, 2593 (void (*)(void *))xdf_dmacallback, 2594 (void *)vdp, 2595 BLKIF_MAX_SEGMENTS_PER_REQUEST); 2596 } 2597 return (NULL); 2598 } 2599 2600 gs = kmem_cache_alloc(xdf_gs_cache, KM_NOSLEEP); 2601 if (gs == NULL) { 2602 gnttab_free_grant_references(gh); 2603 if (vdp->xdf_timeout_id == 0) 2604 /* restart I/O after one second */ 2605 vdp->xdf_timeout_id = 2606 timeout(xdf_timeout_handler, vdp, hz); 2607 return (NULL); 2608 } 2609 2610 /* init gs_slot */ 2611 list_insert_head(&vdp->xdf_gs_act, (void *)gs); 2612 gs->oeid = vdp->xdf_peer; 2613 gs->isread = isread; 2614 gs->ghead = gh; 2615 gs->ngrefs = 0; 2616 2617 return (gs); 2618 } 2619 2620 static void 2621 gs_free(xdf_t *vdp, ge_slot_t *gs) 2622 { 2623 int i; 2624 grant_ref_t *gp = gs->ge; 2625 int ngrefs = gs->ngrefs; 2626 boolean_t isread = gs->isread; 2627 2628 list_remove(&vdp->xdf_gs_act, (void *)gs); 2629 2630 /* release all grant table entry resources used in this slot */ 2631 for (i = 0; i < ngrefs; i++, gp++) 2632 gnttab_end_foreign_access(*gp, !isread, 0); 2633 gnttab_free_grant_references(gs->ghead); 2634 2635 kmem_cache_free(xdf_gs_cache, (void *)gs); 2636 } 2637 2638 static grant_ref_t 2639 gs_grant(ge_slot_t *gs, mfn_t mfn) 2640 { 2641 grant_ref_t gr = gnttab_claim_grant_reference(&gs->ghead); 2642 2643 ASSERT(gr != -1); 2644 ASSERT(gs->ngrefs < BLKIF_MAX_SEGMENTS_PER_REQUEST); 2645 gs->ge[gs->ngrefs++] = gr; 2646 gnttab_grant_foreign_access_ref(gr, gs->oeid, mfn, !gs->isread); 2647 2648 return (gr); 2649 } 2650 2651 static void 2652 unexpectedie(xdf_t *vdp) 2653 { 2654 /* clean up I/Os in ring that have responses */ 2655 if (xvdi_ring_has_unconsumed_responses(vdp->xdf_xb_ring)) { 2656 mutex_exit(&vdp->xdf_dev_lk); 2657 (void) xdf_intr((caddr_t)vdp); 2658 mutex_enter(&vdp->xdf_dev_lk); 2659 } 2660 2661 /* free up all grant table entries */ 2662 while (!list_is_empty(&vdp->xdf_gs_act)) 2663 gs_free(vdp, list_head(&vdp->xdf_gs_act)); 2664 2665 /* 2666 * move bp back to active list orderly 2667 * vreq_busy is updated in vreq_free() 2668 */ 2669 while (!list_is_empty(&vdp->xdf_vreq_act)) { 2670 v_req_t *vreq = list_head(&vdp->xdf_vreq_act); 2671 buf_t *bp = vreq->v_buf; 2672 2673 bp->av_back = NULL; 2674 bp->b_resid = bp->b_bcount; 2675 if (vdp->xdf_f_act == NULL) { 2676 vdp->xdf_f_act = vdp->xdf_l_act = bp; 2677 } else { 2678 /* move to the head of list */ 2679 bp->av_forw = vdp->xdf_f_act; 2680 vdp->xdf_f_act = bp; 2681 } 2682 if (vdp->xdf_xdev_iostat != NULL) 2683 kstat_runq_back_to_waitq( 2684 KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 2685 vreq_free(vdp, vreq); 2686 } 2687 } 2688 2689 static void 2690 xdfmin(struct buf *bp) 2691 { 2692 if (bp->b_bcount > xdf_maxphys) 2693 bp->b_bcount = xdf_maxphys; 2694 } 2695 2696 void 2697 xdf_kstat_delete(dev_info_t *dip) 2698 { 2699 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2700 kstat_t *kstat; 2701 2702 /* 2703 * The locking order here is xdf_iostat_lk and then xdf_dev_lk. 2704 * xdf_dev_lk is used to protect the xdf_xdev_iostat pointer 2705 * and the contents of the our kstat. xdf_iostat_lk is used 2706 * to protect the allocation and freeing of the actual kstat. 2707 * xdf_dev_lk can't be used for this purpose because kstat 2708 * readers use it to access the contents of the kstat and 2709 * hence it can't be held when calling kstat_delete(). 2710 */ 2711 mutex_enter(&vdp->xdf_iostat_lk); 2712 mutex_enter(&vdp->xdf_dev_lk); 2713 2714 if (vdp->xdf_xdev_iostat == NULL) { 2715 mutex_exit(&vdp->xdf_dev_lk); 2716 mutex_exit(&vdp->xdf_iostat_lk); 2717 return; 2718 } 2719 2720 kstat = vdp->xdf_xdev_iostat; 2721 vdp->xdf_xdev_iostat = NULL; 2722 mutex_exit(&vdp->xdf_dev_lk); 2723 2724 kstat_delete(kstat); 2725 mutex_exit(&vdp->xdf_iostat_lk); 2726 } 2727 2728 int 2729 xdf_kstat_create(dev_info_t *dip, char *ks_module, int ks_instance) 2730 { 2731 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2732 2733 /* See comment about locking in xdf_kstat_delete(). */ 2734 mutex_enter(&vdp->xdf_iostat_lk); 2735 mutex_enter(&vdp->xdf_dev_lk); 2736 2737 if (vdp->xdf_xdev_iostat != NULL) { 2738 mutex_exit(&vdp->xdf_dev_lk); 2739 mutex_exit(&vdp->xdf_iostat_lk); 2740 return (-1); 2741 } 2742 2743 if ((vdp->xdf_xdev_iostat = kstat_create( 2744 ks_module, ks_instance, NULL, "disk", 2745 KSTAT_TYPE_IO, 1, KSTAT_FLAG_PERSISTENT)) == NULL) { 2746 mutex_exit(&vdp->xdf_dev_lk); 2747 mutex_exit(&vdp->xdf_iostat_lk); 2748 return (-1); 2749 } 2750 2751 vdp->xdf_xdev_iostat->ks_lock = &vdp->xdf_dev_lk; 2752 kstat_install(vdp->xdf_xdev_iostat); 2753 mutex_exit(&vdp->xdf_dev_lk); 2754 mutex_exit(&vdp->xdf_iostat_lk); 2755 2756 return (0); 2757 } 2758 2759 #if defined(XPV_HVM_DRIVER) 2760 2761 typedef struct xdf_hvm_entry { 2762 list_node_t xdf_he_list; 2763 char *xdf_he_path; 2764 dev_info_t *xdf_he_dip; 2765 } xdf_hvm_entry_t; 2766 2767 static list_t xdf_hvm_list; 2768 static kmutex_t xdf_hvm_list_lock; 2769 2770 static xdf_hvm_entry_t * 2771 i_xdf_hvm_find(char *path, dev_info_t *dip) 2772 { 2773 xdf_hvm_entry_t *i; 2774 2775 ASSERT((path != NULL) || (dip != NULL)); 2776 ASSERT(MUTEX_HELD(&xdf_hvm_list_lock)); 2777 2778 i = list_head(&xdf_hvm_list); 2779 while (i != NULL) { 2780 if ((path != NULL) && strcmp(i->xdf_he_path, path) != 0) { 2781 i = list_next(&xdf_hvm_list, i); 2782 continue; 2783 } 2784 if ((dip != NULL) && (i->xdf_he_dip != dip)) { 2785 i = list_next(&xdf_hvm_list, i); 2786 continue; 2787 } 2788 break; 2789 } 2790 return (i); 2791 } 2792 2793 dev_info_t * 2794 xdf_hvm_hold(char *path) 2795 { 2796 xdf_hvm_entry_t *i; 2797 dev_info_t *dip; 2798 2799 mutex_enter(&xdf_hvm_list_lock); 2800 i = i_xdf_hvm_find(path, NULL); 2801 if (i == NULL) { 2802 mutex_exit(&xdf_hvm_list_lock); 2803 return (B_FALSE); 2804 } 2805 ndi_hold_devi(dip = i->xdf_he_dip); 2806 mutex_exit(&xdf_hvm_list_lock); 2807 return (dip); 2808 } 2809 2810 static void 2811 xdf_hvm_add(dev_info_t *dip) 2812 { 2813 xdf_hvm_entry_t *i; 2814 char *path; 2815 2816 /* figure out the path for the dip */ 2817 path = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 2818 (void) ddi_pathname(dip, path); 2819 2820 i = kmem_alloc(sizeof (*i), KM_SLEEP); 2821 i->xdf_he_dip = dip; 2822 i->xdf_he_path = i_ddi_strdup(path, KM_SLEEP); 2823 2824 mutex_enter(&xdf_hvm_list_lock); 2825 ASSERT(i_xdf_hvm_find(path, NULL) == NULL); 2826 ASSERT(i_xdf_hvm_find(NULL, dip) == NULL); 2827 list_insert_head(&xdf_hvm_list, i); 2828 mutex_exit(&xdf_hvm_list_lock); 2829 2830 kmem_free(path, MAXPATHLEN); 2831 } 2832 2833 static void 2834 xdf_hvm_rm(dev_info_t *dip) 2835 { 2836 xdf_hvm_entry_t *i; 2837 2838 mutex_enter(&xdf_hvm_list_lock); 2839 VERIFY((i = i_xdf_hvm_find(NULL, dip)) != NULL); 2840 list_remove(&xdf_hvm_list, i); 2841 mutex_exit(&xdf_hvm_list_lock); 2842 2843 kmem_free(i->xdf_he_path, strlen(i->xdf_he_path) + 1); 2844 kmem_free(i, sizeof (*i)); 2845 } 2846 2847 static void 2848 xdf_hvm_init(void) 2849 { 2850 list_create(&xdf_hvm_list, sizeof (xdf_hvm_entry_t), 2851 offsetof(xdf_hvm_entry_t, xdf_he_list)); 2852 mutex_init(&xdf_hvm_list_lock, NULL, MUTEX_DEFAULT, NULL); 2853 } 2854 2855 static void 2856 xdf_hvm_fini(void) 2857 { 2858 ASSERT(list_head(&xdf_hvm_list) == NULL); 2859 list_destroy(&xdf_hvm_list); 2860 mutex_destroy(&xdf_hvm_list_lock); 2861 } 2862 2863 int 2864 xdf_hvm_connect(dev_info_t *dip) 2865 { 2866 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2867 int rv; 2868 2869 /* do cv_wait until connected or failed */ 2870 mutex_enter(&vdp->xdf_dev_lk); 2871 rv = xdf_connect(vdp, B_TRUE); 2872 mutex_exit(&vdp->xdf_dev_lk); 2873 return ((rv == XD_READY) ? 0 : -1); 2874 } 2875 2876 int 2877 xdf_hvm_setpgeom(dev_info_t *dip, cmlb_geom_t *geomp) 2878 { 2879 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2880 2881 /* sanity check the requested physical geometry */ 2882 mutex_enter(&vdp->xdf_dev_lk); 2883 if ((geomp->g_secsize != XB_BSIZE) || 2884 (geomp->g_capacity == 0)) { 2885 mutex_exit(&vdp->xdf_dev_lk); 2886 return (EINVAL); 2887 } 2888 2889 /* 2890 * If we've already connected to the backend device then make sure 2891 * we're not defining a physical geometry larger than our backend 2892 * device. 2893 */ 2894 if ((vdp->xdf_xdev_nblocks != 0) && 2895 (geomp->g_capacity > vdp->xdf_xdev_nblocks)) { 2896 mutex_exit(&vdp->xdf_dev_lk); 2897 return (EINVAL); 2898 } 2899 2900 vdp->xdf_pgeom = *geomp; 2901 mutex_exit(&vdp->xdf_dev_lk); 2902 2903 /* force a re-validation */ 2904 cmlb_invalidate(vdp->xdf_vd_lbl, NULL); 2905 2906 return (0); 2907 } 2908 2909 #endif /* XPV_HVM_DRIVER */ 2910