xdf.c revision 7656:2621e50fdf4a
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#include <sys/ddi.h> 35#include <sys/sunddi.h> 36#include <sys/conf.h> 37#include <sys/cmlb.h> 38#include <sys/dkio.h> 39#include <sys/promif.h> 40#include <sys/sysmacros.h> 41#include <sys/kstat.h> 42#include <sys/mach_mmu.h> 43#ifdef XPV_HVM_DRIVER 44#include <sys/xpv_support.h> 45#include <sys/sunndi.h> 46#endif /* XPV_HVM_DRIVER */ 47#include <public/io/xenbus.h> 48#include <xen/sys/xenbus_impl.h> 49#include <xen/sys/xendev.h> 50#include <sys/gnttab.h> 51#include <sys/scsi/generic/inquiry.h> 52#include <xen/io/blkif_impl.h> 53#include <io/xdf.h> 54 55#define FLUSH_DISKCACHE 0x1 56#define WRITE_BARRIER 0x2 57#define DEFAULT_FLUSH_BLOCK 156 /* block to write to cause a cache flush */ 58#define USE_WRITE_BARRIER(vdp) \ 59 ((vdp)->xdf_feature_barrier && !(vdp)->xdf_flush_supported) 60#define USE_FLUSH_DISKCACHE(vdp) \ 61 ((vdp)->xdf_feature_barrier && (vdp)->xdf_flush_supported) 62#define IS_WRITE_BARRIER(vdp, bp) \ 63 (!IS_READ(bp) && USE_WRITE_BARRIER(vdp) && \ 64 ((bp)->b_un.b_addr == (vdp)->xdf_cache_flush_block)) 65#define IS_FLUSH_DISKCACHE(bp) \ 66 (!IS_READ(bp) && USE_FLUSH_DISKCACHE(vdp) && ((bp)->b_bcount == 0)) 67 68static void *vbd_ss; 69static kmem_cache_t *xdf_vreq_cache; 70static kmem_cache_t *xdf_gs_cache; 71static int xdf_maxphys = XB_MAXPHYS; 72int xdfdebug = 0; 73extern int do_polled_io; 74diskaddr_t xdf_flush_block = DEFAULT_FLUSH_BLOCK; 75int xdf_barrier_flush_disable = 0; 76 77/* 78 * dev_ops and cb_ops entrypoints 79 */ 80static int xdf_getinfo(dev_info_t *, ddi_info_cmd_t, void *, void **); 81static int xdf_attach(dev_info_t *, ddi_attach_cmd_t); 82static int xdf_detach(dev_info_t *, ddi_detach_cmd_t); 83static int xdf_reset(dev_info_t *, ddi_reset_cmd_t); 84static int xdf_open(dev_t *, int, int, cred_t *); 85static int xdf_close(dev_t, int, int, struct cred *); 86static int xdf_strategy(struct buf *); 87static int xdf_read(dev_t, struct uio *, cred_t *); 88static int xdf_aread(dev_t, struct aio_req *, cred_t *); 89static int xdf_write(dev_t, struct uio *, cred_t *); 90static int xdf_awrite(dev_t, struct aio_req *, cred_t *); 91static int xdf_dump(dev_t, caddr_t, daddr_t, int); 92static int xdf_ioctl(dev_t, int, intptr_t, int, cred_t *, int *); 93static uint_t xdf_intr(caddr_t); 94static int xdf_prop_op(dev_t, dev_info_t *, ddi_prop_op_t, int, char *, 95 caddr_t, int *); 96 97/* 98 * misc private functions 99 */ 100static int xdf_suspend(dev_info_t *); 101static int xdf_resume(dev_info_t *); 102static int xdf_start_connect(xdf_t *); 103static int xdf_start_disconnect(xdf_t *); 104static int xdf_post_connect(xdf_t *); 105static void xdf_post_disconnect(xdf_t *); 106static void xdf_oe_change(dev_info_t *, ddi_eventcookie_t, void *, void *); 107static void xdf_iostart(xdf_t *); 108static void xdf_iofini(xdf_t *, uint64_t, int); 109static int xdf_prepare_rreq(xdf_t *, struct buf *, blkif_request_t *); 110static int xdf_drain_io(xdf_t *); 111static boolean_t xdf_isopen(xdf_t *, int); 112static int xdf_check_state_transition(xdf_t *, XenbusState); 113static int xdf_connect(xdf_t *, boolean_t); 114static int xdf_dmacallback(caddr_t); 115static void xdf_timeout_handler(void *); 116static uint_t xdf_iorestart(caddr_t); 117static v_req_t *vreq_get(xdf_t *, buf_t *); 118static void vreq_free(xdf_t *, v_req_t *); 119static int vreq_setup(xdf_t *, v_req_t *); 120static ge_slot_t *gs_get(xdf_t *, int); 121static void gs_free(xdf_t *, ge_slot_t *); 122static grant_ref_t gs_grant(ge_slot_t *, mfn_t); 123static void unexpectedie(xdf_t *); 124static void xdfmin(struct buf *); 125static void xdf_synthetic_pgeom(dev_info_t *, cmlb_geom_t *); 126extern int xdf_kstat_create(dev_info_t *, char *, int); 127extern void xdf_kstat_delete(dev_info_t *); 128 129#if defined(XPV_HVM_DRIVER) 130static void xdf_hvm_add(dev_info_t *); 131static void xdf_hvm_rm(dev_info_t *); 132static void xdf_hvm_init(void); 133static void xdf_hvm_fini(void); 134#endif /* XPV_HVM_DRIVER */ 135 136static struct cb_ops xdf_cbops = { 137 xdf_open, 138 xdf_close, 139 xdf_strategy, 140 nodev, 141 xdf_dump, 142 xdf_read, 143 xdf_write, 144 xdf_ioctl, 145 nodev, 146 nodev, 147 nodev, 148 nochpoll, 149 xdf_prop_op, 150 NULL, 151 D_MP | D_NEW | D_64BIT, 152 CB_REV, 153 xdf_aread, 154 xdf_awrite 155}; 156 157struct dev_ops xdf_devops = { 158 DEVO_REV, /* devo_rev */ 159 0, /* devo_refcnt */ 160 xdf_getinfo, /* devo_getinfo */ 161 nulldev, /* devo_identify */ 162 nulldev, /* devo_probe */ 163 xdf_attach, /* devo_attach */ 164 xdf_detach, /* devo_detach */ 165 xdf_reset, /* devo_reset */ 166 &xdf_cbops, /* devo_cb_ops */ 167 (struct bus_ops *)NULL, /* devo_bus_ops */ 168 NULL, /* devo_power */ 169 ddi_quiesce_not_supported, /* devo_quiesce */ 170}; 171 172static struct modldrv modldrv = { 173 &mod_driverops, /* Type of module. This one is a driver */ 174 "virtual block driver", /* short description */ 175 &xdf_devops /* driver specific ops */ 176}; 177 178static 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 */ 186static 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 201static 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 209int xdf_lb_rdwr(dev_info_t *, uchar_t, void *, diskaddr_t, size_t, void *); 210int xdf_lb_getinfo(dev_info_t *, int, void *, void *); 211 212static cmlb_tg_ops_t xdf_lb_ops = { 213 TG_DK_OPS_VERSION_1, 214 xdf_lb_rdwr, 215 xdf_lb_getinfo 216}; 217 218int 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 248int 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 267int 268_info(struct modinfo *modinfop) 269{ 270 return (mod_info(&xdf_modlinkage, modinfop)); 271} 272 273/*ARGSUSED*/ 274static int 275xdf_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 300static int 301xdf_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 xdf_t *vdp; 305 306 if ((vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(dip))) == NULL) 307 return (ddi_prop_op(dev, dip, prop_op, mod_flags, 308 name, valuep, lengthp)); 309 310 return (cmlb_prop_op(vdp->xdf_vd_lbl, 311 dev, dip, prop_op, mod_flags, name, valuep, lengthp, 312 XDF_PART(getminor(dev)), NULL)); 313} 314 315static int 316xdf_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) 317{ 318 xdf_t *vdp; 319 ddi_iblock_cookie_t softibc; 320 int instance; 321 322 xdfdebug = ddi_prop_get_int(DDI_DEV_T_ANY, devi, DDI_PROP_NOTPROM, 323 "xdfdebug", 0); 324 325 switch (cmd) { 326 case DDI_ATTACH: 327 break; 328 329 case DDI_RESUME: 330 return (xdf_resume(devi)); 331 332 default: 333 return (DDI_FAILURE); 334 } 335 336 instance = ddi_get_instance(devi); 337 if (ddi_soft_state_zalloc(vbd_ss, instance) != DDI_SUCCESS) 338 return (DDI_FAILURE); 339 340 DPRINTF(DDI_DBG, ("xdf%d: attaching\n", instance)); 341 vdp = ddi_get_soft_state(vbd_ss, instance); 342 ddi_set_driver_private(devi, vdp); 343 vdp->xdf_dip = devi; 344 cv_init(&vdp->xdf_dev_cv, NULL, CV_DEFAULT, NULL); 345 346 if (ddi_get_iblock_cookie(devi, 0, &vdp->xdf_ibc) != DDI_SUCCESS) { 347 cmn_err(CE_WARN, "xdf@%s: failed to get iblock cookie", 348 ddi_get_name_addr(devi)); 349 goto errout0; 350 } 351 mutex_init(&vdp->xdf_dev_lk, NULL, MUTEX_DRIVER, (void *)vdp->xdf_ibc); 352 mutex_init(&vdp->xdf_cb_lk, NULL, MUTEX_DRIVER, (void *)vdp->xdf_ibc); 353 mutex_init(&vdp->xdf_iostat_lk, NULL, MUTEX_DRIVER, 354 (void *)vdp->xdf_ibc); 355 356 if (ddi_get_soft_iblock_cookie(devi, DDI_SOFTINT_LOW, &softibc) 357 != DDI_SUCCESS) { 358 cmn_err(CE_WARN, "xdf@%s: failed to get softintr iblock cookie", 359 ddi_get_name_addr(devi)); 360 goto errout0; 361 } 362 if (ddi_add_softintr(devi, DDI_SOFTINT_LOW, &vdp->xdf_softintr_id, 363 &softibc, NULL, xdf_iorestart, (caddr_t)vdp) != DDI_SUCCESS) { 364 cmn_err(CE_WARN, "xdf@%s: failed to add softintr", 365 ddi_get_name_addr(devi)); 366 goto errout0; 367 } 368 369#if !defined(XPV_HVM_DRIVER) 370 /* create kstat for iostat(1M) */ 371 if (xdf_kstat_create(devi, "xdf", instance) != 0) { 372 cmn_err(CE_WARN, "xdf@%s: failed to create kstat", 373 ddi_get_name_addr(devi)); 374 goto errout0; 375 } 376#endif /* !XPV_HVM_DRIVER */ 377 378 /* driver handles kernel-issued IOCTLs */ 379 if (ddi_prop_create(DDI_DEV_T_NONE, devi, DDI_PROP_CANSLEEP, 380 DDI_KERNEL_IOCTL, NULL, 0) != DDI_PROP_SUCCESS) { 381 cmn_err(CE_WARN, "xdf@%s: cannot create DDI_KERNEL_IOCTL prop", 382 ddi_get_name_addr(devi)); 383 goto errout0; 384 } 385 386 /* 387 * Initialize the physical geometry stucture. Note that currently 388 * we don't know the size of the backend device so the number 389 * of blocks on the device will be initialized to zero. Once 390 * we connect to the backend device we'll update the physical 391 * geometry to reflect the real size of the device. 392 */ 393 xdf_synthetic_pgeom(devi, &vdp->xdf_pgeom); 394 395 /* 396 * create default device minor nodes: non-removable disk 397 * we will adjust minor nodes after we are connected w/ backend 398 */ 399 cmlb_alloc_handle(&vdp->xdf_vd_lbl); 400 if (cmlb_attach(devi, &xdf_lb_ops, DTYPE_DIRECT, 0, 1, 401 DDI_NT_BLOCK_XVMD, 402#if defined(XPV_HVM_DRIVER) 403 CMLB_CREATE_ALTSLICE_VTOC_16_DTYPE_DIRECT | 404 CMLB_INTERNAL_MINOR_NODES, 405#else /* !XPV_HVM_DRIVER */ 406 CMLB_FAKE_LABEL_ONE_PARTITION, 407#endif /* !XPV_HVM_DRIVER */ 408 vdp->xdf_vd_lbl, NULL) != 0) { 409 cmn_err(CE_WARN, "xdf@%s: default cmlb attach failed", 410 ddi_get_name_addr(devi)); 411 goto errout0; 412 } 413 414 /* 415 * We ship with cache-enabled disks 416 */ 417 vdp->xdf_wce = 1; 418 419 mutex_enter(&vdp->xdf_cb_lk); 420 421 /* Watch backend XenbusState change */ 422 if (xvdi_add_event_handler(devi, XS_OE_STATE, 423 xdf_oe_change) != DDI_SUCCESS) { 424 mutex_exit(&vdp->xdf_cb_lk); 425 goto errout0; 426 } 427 428 if (xdf_start_connect(vdp) != DDI_SUCCESS) { 429 cmn_err(CE_WARN, "xdf@%s: start connection failed", 430 ddi_get_name_addr(devi)); 431 (void) xdf_start_disconnect(vdp); 432 mutex_exit(&vdp->xdf_cb_lk); 433 goto errout1; 434 } 435 436 mutex_exit(&vdp->xdf_cb_lk); 437 438 list_create(&vdp->xdf_vreq_act, sizeof (v_req_t), 439 offsetof(v_req_t, v_link)); 440 list_create(&vdp->xdf_gs_act, sizeof (ge_slot_t), 441 offsetof(ge_slot_t, link)); 442 443#if defined(XPV_HVM_DRIVER) 444 xdf_hvm_add(devi); 445 446 (void) ddi_prop_update_int(DDI_DEV_T_NONE, devi, DDI_NO_AUTODETACH, 1); 447 448 /* 449 * Report our version to dom0. 450 */ 451 if (xenbus_printf(XBT_NULL, "hvmpv/xdf", "version", "%d", 452 HVMPV_XDF_VERS)) 453 cmn_err(CE_WARN, "xdf: couldn't write version\n"); 454#endif /* XPV_HVM_DRIVER */ 455 456 ddi_report_dev(devi); 457 458 DPRINTF(DDI_DBG, ("xdf%d: attached\n", instance)); 459 460 return (DDI_SUCCESS); 461 462errout1: 463 xvdi_remove_event_handler(devi, XS_OE_STATE); 464errout0: 465 if (vdp->xdf_vd_lbl != NULL) { 466 cmlb_detach(vdp->xdf_vd_lbl, NULL); 467 cmlb_free_handle(&vdp->xdf_vd_lbl); 468 vdp->xdf_vd_lbl = NULL; 469 } 470#if !defined(XPV_HVM_DRIVER) 471 xdf_kstat_delete(devi); 472#endif /* !XPV_HVM_DRIVER */ 473 if (vdp->xdf_softintr_id != NULL) 474 ddi_remove_softintr(vdp->xdf_softintr_id); 475 if (vdp->xdf_ibc != NULL) { 476 mutex_destroy(&vdp->xdf_cb_lk); 477 mutex_destroy(&vdp->xdf_dev_lk); 478 } 479 cv_destroy(&vdp->xdf_dev_cv); 480 ddi_soft_state_free(vbd_ss, instance); 481 ddi_set_driver_private(devi, NULL); 482 ddi_prop_remove_all(devi); 483 cmn_err(CE_WARN, "xdf@%s: attach failed", ddi_get_name_addr(devi)); 484 return (DDI_FAILURE); 485} 486 487static int 488xdf_detach(dev_info_t *devi, ddi_detach_cmd_t cmd) 489{ 490 xdf_t *vdp; 491 int instance; 492 493 switch (cmd) { 494 495 case DDI_PM_SUSPEND: 496 break; 497 498 case DDI_SUSPEND: 499 return (xdf_suspend(devi)); 500 501 case DDI_DETACH: 502 break; 503 504 default: 505 return (DDI_FAILURE); 506 } 507 508 instance = ddi_get_instance(devi); 509 DPRINTF(DDI_DBG, ("xdf%d: detaching\n", instance)); 510 vdp = ddi_get_soft_state(vbd_ss, instance); 511 512 if (vdp == NULL) 513 return (DDI_FAILURE); 514 515 mutex_enter(&vdp->xdf_dev_lk); 516 if (xdf_isopen(vdp, -1)) { 517 mutex_exit(&vdp->xdf_dev_lk); 518 return (DDI_FAILURE); 519 } 520 521 if (vdp->xdf_status != XD_CLOSED) { 522 mutex_exit(&vdp->xdf_dev_lk); 523 return (DDI_FAILURE); 524 } 525 526#if defined(XPV_HVM_DRIVER) 527 xdf_hvm_rm(devi); 528#endif /* XPV_HVM_DRIVER */ 529 530 ASSERT(!ISDMACBON(vdp)); 531 mutex_exit(&vdp->xdf_dev_lk); 532 533 if (vdp->xdf_timeout_id != 0) 534 (void) untimeout(vdp->xdf_timeout_id); 535 536 xvdi_remove_event_handler(devi, XS_OE_STATE); 537 538 /* we'll support backend running in domU later */ 539#ifdef DOMU_BACKEND 540 (void) xvdi_post_event(devi, XEN_HP_REMOVE); 541#endif 542 543 list_destroy(&vdp->xdf_vreq_act); 544 list_destroy(&vdp->xdf_gs_act); 545 ddi_prop_remove_all(devi); 546 xdf_kstat_delete(devi); 547 ddi_remove_softintr(vdp->xdf_softintr_id); 548 ddi_set_driver_private(devi, NULL); 549 cv_destroy(&vdp->xdf_dev_cv); 550 mutex_destroy(&vdp->xdf_cb_lk); 551 mutex_destroy(&vdp->xdf_dev_lk); 552 if (vdp->xdf_cache_flush_block != NULL) 553 kmem_free(vdp->xdf_flush_mem, 2 * DEV_BSIZE); 554 ddi_soft_state_free(vbd_ss, instance); 555 return (DDI_SUCCESS); 556} 557 558static int 559xdf_suspend(dev_info_t *devi) 560{ 561 xdf_t *vdp; 562 int instance; 563 enum xdf_state st; 564 565 instance = ddi_get_instance(devi); 566 567 if (xdfdebug & SUSRES_DBG) 568 xen_printf("xdf_suspend: xdf#%d\n", instance); 569 570 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 571 return (DDI_FAILURE); 572 573 xvdi_suspend(devi); 574 575 mutex_enter(&vdp->xdf_cb_lk); 576 mutex_enter(&vdp->xdf_dev_lk); 577 st = vdp->xdf_status; 578 /* change status to stop further I/O requests */ 579 if (st == XD_READY) 580 vdp->xdf_status = XD_SUSPEND; 581 mutex_exit(&vdp->xdf_dev_lk); 582 mutex_exit(&vdp->xdf_cb_lk); 583 584 /* make sure no more I/O responses left in the ring buffer */ 585 if ((st == XD_INIT) || (st == XD_READY)) { 586#ifdef XPV_HVM_DRIVER 587 ec_unbind_evtchn(vdp->xdf_evtchn); 588 xvdi_free_evtchn(devi); 589#else /* !XPV_HVM_DRIVER */ 590 (void) ddi_remove_intr(devi, 0, NULL); 591#endif /* !XPV_HVM_DRIVER */ 592 (void) xdf_drain_io(vdp); 593 /* 594 * no need to teardown the ring buffer here 595 * it will be simply re-init'ed during resume when 596 * we call xvdi_alloc_ring 597 */ 598 } 599 600 if (xdfdebug & SUSRES_DBG) 601 xen_printf("xdf_suspend: SUCCESS\n"); 602 603 return (DDI_SUCCESS); 604} 605 606/*ARGSUSED*/ 607static int 608xdf_resume(dev_info_t *devi) 609{ 610 xdf_t *vdp; 611 int instance; 612 613 instance = ddi_get_instance(devi); 614 if (xdfdebug & SUSRES_DBG) 615 xen_printf("xdf_resume: xdf%d\n", instance); 616 617 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 618 return (DDI_FAILURE); 619 620 mutex_enter(&vdp->xdf_cb_lk); 621 622 if (xvdi_resume(devi) != DDI_SUCCESS) { 623 mutex_exit(&vdp->xdf_cb_lk); 624 return (DDI_FAILURE); 625 } 626 627 mutex_enter(&vdp->xdf_dev_lk); 628 ASSERT(vdp->xdf_status != XD_READY); 629 vdp->xdf_status = XD_UNKNOWN; 630 mutex_exit(&vdp->xdf_dev_lk); 631 632 if (xdf_start_connect(vdp) != DDI_SUCCESS) { 633 mutex_exit(&vdp->xdf_cb_lk); 634 return (DDI_FAILURE); 635 } 636 637 mutex_exit(&vdp->xdf_cb_lk); 638 639 if (xdfdebug & SUSRES_DBG) 640 xen_printf("xdf_resume: done\n"); 641 return (DDI_SUCCESS); 642} 643 644/*ARGSUSED*/ 645static int 646xdf_reset(dev_info_t *devi, ddi_reset_cmd_t cmd) 647{ 648 xdf_t *vdp; 649 int instance; 650 651 instance = ddi_get_instance(devi); 652 DPRINTF(DDI_DBG, ("xdf%d: resetting\n", instance)); 653 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 654 return (DDI_FAILURE); 655 656 /* 657 * wait for any outstanding I/O to complete 658 */ 659 (void) xdf_drain_io(vdp); 660 661 DPRINTF(DDI_DBG, ("xdf%d: reset complete\n", instance)); 662 return (DDI_SUCCESS); 663} 664 665static int 666xdf_open(dev_t *devp, int flag, int otyp, cred_t *credp) 667{ 668 minor_t minor; 669 xdf_t *vdp; 670 int part; 671 ulong_t parbit; 672 diskaddr_t p_blkct = 0; 673 boolean_t firstopen; 674 boolean_t nodelay; 675 676 minor = getminor(*devp); 677 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 678 return (ENXIO); 679 680 nodelay = (flag & (FNDELAY | FNONBLOCK)); 681 682 DPRINTF(DDI_DBG, ("xdf%d: opening\n", XDF_INST(minor))); 683 684 /* do cv_wait until connected or failed */ 685 mutex_enter(&vdp->xdf_dev_lk); 686 if (!nodelay && (xdf_connect(vdp, B_TRUE) != XD_READY)) { 687 mutex_exit(&vdp->xdf_dev_lk); 688 return (ENXIO); 689 } 690 691 if ((flag & FWRITE) && XD_IS_RO(vdp)) { 692 mutex_exit(&vdp->xdf_dev_lk); 693 return (EROFS); 694 } 695 696 part = XDF_PART(minor); 697 parbit = 1 << part; 698 if ((vdp->xdf_vd_exclopen & parbit) || 699 ((flag & FEXCL) && xdf_isopen(vdp, part))) { 700 mutex_exit(&vdp->xdf_dev_lk); 701 return (EBUSY); 702 } 703 704 /* are we the first one to open this node? */ 705 firstopen = !xdf_isopen(vdp, -1); 706 707 if (otyp == OTYP_LYR) 708 vdp->xdf_vd_lyropen[part]++; 709 710 vdp->xdf_vd_open[otyp] |= parbit; 711 712 if (flag & FEXCL) 713 vdp->xdf_vd_exclopen |= parbit; 714 715 mutex_exit(&vdp->xdf_dev_lk); 716 717 /* force a re-validation */ 718 if (firstopen) 719 cmlb_invalidate(vdp->xdf_vd_lbl, NULL); 720 721 /* 722 * check size 723 * ignore CD/DVD which contains a zero-sized s0 724 */ 725 if (!nodelay && !XD_IS_CD(vdp) && 726 ((cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkct, 727 NULL, NULL, NULL, NULL) != 0) || (p_blkct == 0))) { 728 (void) xdf_close(*devp, flag, otyp, credp); 729 return (ENXIO); 730 } 731 732 return (0); 733} 734 735/*ARGSUSED*/ 736static int 737xdf_close(dev_t dev, int flag, int otyp, struct cred *credp) 738{ 739 minor_t minor; 740 xdf_t *vdp; 741 int part; 742 ulong_t parbit; 743 744 minor = getminor(dev); 745 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 746 return (ENXIO); 747 748 mutex_enter(&vdp->xdf_dev_lk); 749 part = XDF_PART(minor); 750 if (!xdf_isopen(vdp, part)) { 751 mutex_exit(&vdp->xdf_dev_lk); 752 return (ENXIO); 753 } 754 parbit = 1 << part; 755 756 ASSERT((vdp->xdf_vd_open[otyp] & parbit) != 0); 757 if (otyp == OTYP_LYR) { 758 ASSERT(vdp->xdf_vd_lyropen[part] > 0); 759 if (--vdp->xdf_vd_lyropen[part] == 0) 760 vdp->xdf_vd_open[otyp] &= ~parbit; 761 } else { 762 vdp->xdf_vd_open[otyp] &= ~parbit; 763 } 764 vdp->xdf_vd_exclopen &= ~parbit; 765 766 mutex_exit(&vdp->xdf_dev_lk); 767 return (0); 768} 769 770static int 771xdf_strategy(struct buf *bp) 772{ 773 xdf_t *vdp; 774 minor_t minor; 775 diskaddr_t p_blkct, p_blkst; 776 ulong_t nblks; 777 int part; 778 779 minor = getminor(bp->b_edev); 780 part = XDF_PART(minor); 781 782 vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor)); 783 if ((vdp == NULL) || !xdf_isopen(vdp, part)) { 784 bioerror(bp, ENXIO); 785 bp->b_resid = bp->b_bcount; 786 biodone(bp); 787 return (0); 788 } 789 790 /* Check for writes to a read only device */ 791 if (!IS_READ(bp) && XD_IS_RO(vdp)) { 792 bioerror(bp, EROFS); 793 bp->b_resid = bp->b_bcount; 794 biodone(bp); 795 return (0); 796 } 797 798 /* Check if this I/O is accessing a partition or the entire disk */ 799 if ((long)bp->b_private == XB_SLICE_NONE) { 800 /* This I/O is using an absolute offset */ 801 p_blkct = vdp->xdf_xdev_nblocks; 802 p_blkst = 0; 803 } else { 804 /* This I/O is using a partition relative offset */ 805 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkct, 806 &p_blkst, NULL, NULL, NULL)) { 807 bioerror(bp, ENXIO); 808 bp->b_resid = bp->b_bcount; 809 biodone(bp); 810 return (0); 811 } 812 } 813 814 /* check for a starting block beyond the disk or partition limit */ 815 if (bp->b_blkno > p_blkct) { 816 DPRINTF(IO_DBG, ("xdf: block %lld exceeds VBD size %"PRIu64, 817 (longlong_t)bp->b_blkno, (uint64_t)p_blkct)); 818 bioerror(bp, EINVAL); 819 bp->b_resid = bp->b_bcount; 820 biodone(bp); 821 return (0); 822 } 823 824 /* Legacy: don't set error flag at this case */ 825 if (bp->b_blkno == p_blkct) { 826 bp->b_resid = bp->b_bcount; 827 biodone(bp); 828 return (0); 829 } 830 831 /* Adjust for partial transfer */ 832 nblks = bp->b_bcount >> XB_BSHIFT; 833 if ((bp->b_blkno + nblks) > p_blkct) { 834 bp->b_resid = ((bp->b_blkno + nblks) - p_blkct) << XB_BSHIFT; 835 bp->b_bcount -= bp->b_resid; 836 } 837 838 DPRINTF(IO_DBG, ("xdf: strategy blk %lld len %lu\n", 839 (longlong_t)bp->b_blkno, (ulong_t)bp->b_bcount)); 840 841 /* Fix up the buf struct */ 842 bp->b_flags |= B_BUSY; 843 bp->av_forw = bp->av_back = NULL; /* not tagged with a v_req */ 844 bp->b_private = (void *)(uintptr_t)p_blkst; 845 846 mutex_enter(&vdp->xdf_dev_lk); 847 if (vdp->xdf_xdev_iostat != NULL) 848 kstat_waitq_enter(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 849 if (vdp->xdf_f_act == NULL) { 850 vdp->xdf_f_act = vdp->xdf_l_act = bp; 851 } else { 852 vdp->xdf_l_act->av_forw = bp; 853 vdp->xdf_l_act = bp; 854 } 855 mutex_exit(&vdp->xdf_dev_lk); 856 857 xdf_iostart(vdp); 858 if (do_polled_io) 859 (void) xdf_drain_io(vdp); 860 return (0); 861} 862 863/*ARGSUSED*/ 864static int 865xdf_read(dev_t dev, struct uio *uiop, cred_t *credp) 866{ 867 868 xdf_t *vdp; 869 minor_t minor; 870 diskaddr_t p_blkcnt; 871 int part; 872 873 minor = getminor(dev); 874 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 875 return (ENXIO); 876 877 DPRINTF(IO_DBG, ("xdf: read offset 0x%"PRIx64"\n", 878 (int64_t)uiop->uio_offset)); 879 880 part = XDF_PART(minor); 881 if (!xdf_isopen(vdp, part)) 882 return (ENXIO); 883 884 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 885 NULL, NULL, NULL, NULL)) 886 return (ENXIO); 887 888 if (U_INVAL(uiop)) 889 return (EINVAL); 890 891 return (physio(xdf_strategy, NULL, dev, B_READ, xdfmin, uiop)); 892} 893 894/*ARGSUSED*/ 895static int 896xdf_write(dev_t dev, struct uio *uiop, cred_t *credp) 897{ 898 xdf_t *vdp; 899 minor_t minor; 900 diskaddr_t p_blkcnt; 901 int part; 902 903 minor = getminor(dev); 904 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 905 return (ENXIO); 906 907 DPRINTF(IO_DBG, ("xdf: write offset 0x%"PRIx64"\n", 908 (int64_t)uiop->uio_offset)); 909 910 part = XDF_PART(minor); 911 if (!xdf_isopen(vdp, part)) 912 return (ENXIO); 913 914 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 915 NULL, NULL, NULL, NULL)) 916 return (ENXIO); 917 918 if (uiop->uio_loffset >= XB_DTOB(p_blkcnt)) 919 return (ENOSPC); 920 921 if (U_INVAL(uiop)) 922 return (EINVAL); 923 924 return (physio(xdf_strategy, NULL, dev, B_WRITE, minphys, uiop)); 925} 926 927/*ARGSUSED*/ 928static int 929xdf_aread(dev_t dev, struct aio_req *aiop, cred_t *credp) 930{ 931 xdf_t *vdp; 932 minor_t minor; 933 struct uio *uiop = aiop->aio_uio; 934 diskaddr_t p_blkcnt; 935 int part; 936 937 minor = getminor(dev); 938 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 939 return (ENXIO); 940 941 part = XDF_PART(minor); 942 if (!xdf_isopen(vdp, part)) 943 return (ENXIO); 944 945 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 946 NULL, NULL, NULL, NULL)) 947 return (ENXIO); 948 949 if (uiop->uio_loffset >= XB_DTOB(p_blkcnt)) 950 return (ENOSPC); 951 952 if (U_INVAL(uiop)) 953 return (EINVAL); 954 955 return (aphysio(xdf_strategy, anocancel, dev, B_READ, minphys, aiop)); 956} 957 958/*ARGSUSED*/ 959static int 960xdf_awrite(dev_t dev, struct aio_req *aiop, cred_t *credp) 961{ 962 xdf_t *vdp; 963 minor_t minor; 964 struct uio *uiop = aiop->aio_uio; 965 diskaddr_t p_blkcnt; 966 int part; 967 968 minor = getminor(dev); 969 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 970 return (ENXIO); 971 972 part = XDF_PART(minor); 973 if (!xdf_isopen(vdp, part)) 974 return (ENXIO); 975 976 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, 977 NULL, NULL, NULL, NULL)) 978 return (ENXIO); 979 980 if (uiop->uio_loffset >= XB_DTOB(p_blkcnt)) 981 return (ENOSPC); 982 983 if (U_INVAL(uiop)) 984 return (EINVAL); 985 986 return (aphysio(xdf_strategy, anocancel, dev, B_WRITE, minphys, aiop)); 987} 988 989static int 990xdf_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblk) 991{ 992 struct buf dumpbuf, *dbp; 993 xdf_t *vdp; 994 minor_t minor; 995 int err = 0; 996 int part; 997 diskaddr_t p_blkcnt, p_blkst; 998 999 minor = getminor(dev); 1000 if ((vdp = ddi_get_soft_state(vbd_ss, XDF_INST(minor))) == NULL) 1001 return (ENXIO); 1002 1003 DPRINTF(IO_DBG, ("xdf: dump addr (0x%p) blk (%ld) nblks (%d)\n", 1004 (void *)addr, blkno, nblk)); 1005 1006 part = XDF_PART(minor); 1007 if (!xdf_isopen(vdp, part)) 1008 return (ENXIO); 1009 1010 if (cmlb_partinfo(vdp->xdf_vd_lbl, part, &p_blkcnt, &p_blkst, 1011 NULL, NULL, NULL)) 1012 return (ENXIO); 1013 1014 if ((blkno + nblk) > p_blkcnt) { 1015 cmn_err(CE_WARN, "xdf: block %ld exceeds VBD size %"PRIu64, 1016 blkno + nblk, (uint64_t)p_blkcnt); 1017 return (EINVAL); 1018 } 1019 1020 dbp = &dumpbuf; 1021 bioinit(dbp); 1022 dbp->b_flags = B_BUSY; 1023 dbp->b_un.b_addr = addr; 1024 dbp->b_bcount = nblk << DEV_BSHIFT; 1025 dbp->b_blkno = blkno; 1026 dbp->b_edev = dev; 1027 dbp->b_private = (void *)(uintptr_t)p_blkst; 1028 1029 mutex_enter(&vdp->xdf_dev_lk); 1030 if (vdp->xdf_xdev_iostat != NULL) 1031 kstat_waitq_enter(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1032 if (vdp->xdf_f_act == NULL) { 1033 vdp->xdf_f_act = vdp->xdf_l_act = dbp; 1034 } else { 1035 vdp->xdf_l_act->av_forw = dbp; 1036 vdp->xdf_l_act = dbp; 1037 } 1038 dbp->av_forw = NULL; 1039 dbp->av_back = NULL; 1040 mutex_exit(&vdp->xdf_dev_lk); 1041 xdf_iostart(vdp); 1042 err = xdf_drain_io(vdp); 1043 biofini(dbp); 1044 return (err); 1045} 1046 1047/*ARGSUSED*/ 1048static int 1049xdf_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp, 1050 int *rvalp) 1051{ 1052 int instance; 1053 xdf_t *vdp; 1054 minor_t minor; 1055 int part; 1056 1057 minor = getminor(dev); 1058 instance = XDF_INST(minor); 1059 1060 if ((vdp = ddi_get_soft_state(vbd_ss, instance)) == NULL) 1061 return (ENXIO); 1062 1063 DPRINTF(IOCTL_DBG, ("xdf%d:ioctl: cmd %d (0x%x)\n", 1064 instance, cmd, cmd)); 1065 1066 part = XDF_PART(minor); 1067 if (!xdf_isopen(vdp, part)) 1068 return (ENXIO); 1069 1070 switch (cmd) { 1071 case DKIOCGMEDIAINFO: { 1072 struct dk_minfo media_info; 1073 1074 media_info.dki_lbsize = DEV_BSIZE; 1075 media_info.dki_capacity = vdp->xdf_pgeom.g_capacity; 1076 media_info.dki_media_type = DK_FIXED_DISK; 1077 1078 if (ddi_copyout(&media_info, (void *)arg, 1079 sizeof (struct dk_minfo), mode)) { 1080 return (EFAULT); 1081 } else { 1082 return (0); 1083 } 1084 } 1085 1086 case DKIOCINFO: { 1087 struct dk_cinfo info; 1088 1089 /* controller information */ 1090 if (XD_IS_CD(vdp)) 1091 info.dki_ctype = DKC_CDROM; 1092 else 1093 info.dki_ctype = DKC_VBD; 1094 1095 info.dki_cnum = 0; 1096 (void) strncpy((char *)(&info.dki_cname), "xdf", 8); 1097 1098 /* unit information */ 1099 info.dki_unit = ddi_get_instance(vdp->xdf_dip); 1100 (void) strncpy((char *)(&info.dki_dname), "xdf", 8); 1101 info.dki_flags = DKI_FMTVOL; 1102 info.dki_partition = part; 1103 info.dki_maxtransfer = maxphys / DEV_BSIZE; 1104 info.dki_addr = 0; 1105 info.dki_space = 0; 1106 info.dki_prio = 0; 1107 info.dki_vec = 0; 1108 1109 if (ddi_copyout(&info, (void *)arg, sizeof (info), mode)) 1110 return (EFAULT); 1111 else 1112 return (0); 1113 } 1114 1115 case DKIOCSTATE: { 1116 enum dkio_state dkstate = DKIO_INSERTED; 1117 if (ddi_copyout(&dkstate, (void *)arg, sizeof (dkstate), 1118 mode) != 0) 1119 return (EFAULT); 1120 return (0); 1121 } 1122 1123 /* 1124 * is media removable? 1125 */ 1126 case DKIOCREMOVABLE: { 1127 int i = XD_IS_RM(vdp) ? 1 : 0; 1128 if (ddi_copyout(&i, (caddr_t)arg, sizeof (int), mode)) 1129 return (EFAULT); 1130 return (0); 1131 } 1132 1133 case DKIOCG_PHYGEOM: 1134 case DKIOCG_VIRTGEOM: 1135 case DKIOCGGEOM: 1136 case DKIOCSGEOM: 1137 case DKIOCGAPART: 1138 case DKIOCSAPART: 1139 case DKIOCGVTOC: 1140 case DKIOCSVTOC: 1141 case DKIOCPARTINFO: 1142 case DKIOCGEXTVTOC: 1143 case DKIOCSEXTVTOC: 1144 case DKIOCEXTPARTINFO: 1145 case DKIOCGMBOOT: 1146 case DKIOCSMBOOT: 1147 case DKIOCGETEFI: 1148 case DKIOCSETEFI: 1149 case DKIOCPARTITION: { 1150 int rc; 1151 1152 rc = cmlb_ioctl(vdp->xdf_vd_lbl, dev, cmd, arg, mode, credp, 1153 rvalp, NULL); 1154 return (rc); 1155 } 1156 1157 case DKIOCGETWCE: 1158 if (ddi_copyout(&vdp->xdf_wce, (void *)arg, 1159 sizeof (vdp->xdf_wce), mode)) 1160 return (EFAULT); 1161 return (0); 1162 case DKIOCSETWCE: 1163 if (ddi_copyin((void *)arg, &vdp->xdf_wce, 1164 sizeof (vdp->xdf_wce), mode)) 1165 return (EFAULT); 1166 return (0); 1167 case DKIOCFLUSHWRITECACHE: { 1168 int rc; 1169 struct dk_callback *dkc = (struct dk_callback *)arg; 1170 1171 if (vdp->xdf_flush_supported) { 1172 rc = xdf_lb_rdwr(vdp->xdf_dip, TG_WRITE, 1173 NULL, 0, 0, (void *)dev); 1174 } else if (vdp->xdf_feature_barrier && 1175 !xdf_barrier_flush_disable) { 1176 rc = xdf_lb_rdwr(vdp->xdf_dip, TG_WRITE, 1177 vdp->xdf_cache_flush_block, xdf_flush_block, 1178 DEV_BSIZE, (void *)dev); 1179 } else { 1180 return (ENOTTY); 1181 } 1182 if ((mode & FKIOCTL) && (dkc != NULL) && 1183 (dkc->dkc_callback != NULL)) { 1184 (*dkc->dkc_callback)(dkc->dkc_cookie, rc); 1185 /* need to return 0 after calling callback */ 1186 rc = 0; 1187 } 1188 return (rc); 1189 } 1190 1191 default: 1192 return (ENOTTY); 1193 } 1194} 1195 1196/* 1197 * xdf interrupt handler 1198 */ 1199static uint_t 1200xdf_intr(caddr_t arg) 1201{ 1202 xdf_t *vdp = (xdf_t *)arg; 1203 xendev_ring_t *xbr; 1204 blkif_response_t *resp; 1205 int bioerr; 1206 uint64_t id; 1207 extern int do_polled_io; 1208 uint8_t op; 1209 uint16_t status; 1210 ddi_acc_handle_t acchdl; 1211 1212 mutex_enter(&vdp->xdf_dev_lk); 1213 1214 if ((xbr = vdp->xdf_xb_ring) == NULL) { 1215 mutex_exit(&vdp->xdf_dev_lk); 1216 return (DDI_INTR_UNCLAIMED); 1217 } 1218 1219 acchdl = vdp->xdf_xb_ring_hdl; 1220 1221 /* 1222 * complete all requests which have a response 1223 */ 1224 while (resp = xvdi_ring_get_response(xbr)) { 1225 id = ddi_get64(acchdl, &resp->id); 1226 op = ddi_get8(acchdl, &resp->operation); 1227 status = ddi_get16(acchdl, (uint16_t *)&resp->status); 1228 DPRINTF(INTR_DBG, ("resp: op %d id %"PRIu64" status %d\n", 1229 op, id, status)); 1230 1231 /* 1232 * XXPV - close connection to the backend and restart 1233 */ 1234 if (status != BLKIF_RSP_OKAY) { 1235 DPRINTF(IO_DBG, ("xdf@%s: I/O error while %s", 1236 ddi_get_name_addr(vdp->xdf_dip), 1237 (op == BLKIF_OP_READ) ? "reading" : "writing")); 1238 bioerr = EIO; 1239 } else { 1240 bioerr = 0; 1241 } 1242 1243 xdf_iofini(vdp, id, bioerr); 1244 } 1245 1246 mutex_exit(&vdp->xdf_dev_lk); 1247 1248 if (!do_polled_io) 1249 xdf_iostart(vdp); 1250 1251 return (DDI_INTR_CLAIMED); 1252} 1253 1254int xdf_fbrewrites; /* how many times was our flush block rewritten */ 1255 1256/* 1257 * Snarf new data if our flush block was re-written 1258 */ 1259static void 1260check_fbwrite(xdf_t *vdp, buf_t *bp, daddr_t blkno) 1261{ 1262 int nblks; 1263 boolean_t mapin; 1264 1265 if (IS_WRITE_BARRIER(vdp, bp)) 1266 return; /* write was a flush write */ 1267 1268 mapin = B_FALSE; 1269 nblks = bp->b_bcount >> DEV_BSHIFT; 1270 if (xdf_flush_block >= blkno && xdf_flush_block < (blkno + nblks)) { 1271 xdf_fbrewrites++; 1272 if (bp->b_flags & (B_PAGEIO | B_PHYS)) { 1273 mapin = B_TRUE; 1274 bp_mapin(bp); 1275 } 1276 bcopy(bp->b_un.b_addr + 1277 ((xdf_flush_block - blkno) << DEV_BSHIFT), 1278 vdp->xdf_cache_flush_block, DEV_BSIZE); 1279 if (mapin) 1280 bp_mapout(bp); 1281 } 1282} 1283 1284static void 1285xdf_iofini(xdf_t *vdp, uint64_t id, int bioerr) 1286{ 1287 ge_slot_t *gs = (ge_slot_t *)(uintptr_t)id; 1288 v_req_t *vreq = gs->vreq; 1289 buf_t *bp = vreq->v_buf; 1290 1291 gs_free(vdp, gs); 1292 if (bioerr) 1293 bioerror(bp, bioerr); 1294 vreq->v_nslots--; 1295 if (vreq->v_nslots != 0) 1296 return; 1297 1298 XDF_UPDATE_IO_STAT(vdp, bp); 1299 if (vdp->xdf_xdev_iostat != NULL) 1300 kstat_runq_exit(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1301 1302 if (IS_ERROR(bp)) 1303 bp->b_resid = bp->b_bcount; 1304 1305 vreq_free(vdp, vreq); 1306 biodone(bp); 1307} 1308 1309/* 1310 * return value of xdf_prepare_rreq() 1311 * used in xdf_iostart() 1312 */ 1313#define XF_PARTIAL 0 /* rreq is full, not all I/O in buf transferred */ 1314#define XF_COMP 1 /* no more I/O left in buf */ 1315 1316static void 1317xdf_iostart(xdf_t *vdp) 1318{ 1319 xendev_ring_t *xbr; 1320 struct buf *bp; 1321 blkif_request_t *rreq; 1322 int retval; 1323 int rreqready = 0; 1324 1325 xbr = vdp->xdf_xb_ring; 1326 1327 /* 1328 * populate the ring request(s) 1329 * 1330 * loop until there is no buf to transfer or no free slot 1331 * available in I/O ring 1332 */ 1333 mutex_enter(&vdp->xdf_dev_lk); 1334 1335 for (;;) { 1336 if (vdp->xdf_status != XD_READY) 1337 break; 1338 1339 /* active buf queue empty? */ 1340 if ((bp = vdp->xdf_f_act) == NULL) 1341 break; 1342 1343 /* try to grab a vreq for this bp */ 1344 if ((BP2VREQ(bp) == NULL) && (vreq_get(vdp, bp) == NULL)) 1345 break; 1346 /* alloc DMA/GTE resources */ 1347 if (vreq_setup(vdp, BP2VREQ(bp)) != DDI_SUCCESS) 1348 break; 1349 1350 /* get next blkif_request in the ring */ 1351 if ((rreq = xvdi_ring_get_request(xbr)) == NULL) 1352 break; 1353 bzero(rreq, sizeof (blkif_request_t)); 1354 1355 /* populate blkif_request with this buf */ 1356 rreqready++; 1357 retval = xdf_prepare_rreq(vdp, bp, rreq); 1358 if (retval == XF_COMP) { 1359 /* finish this bp, switch to next one */ 1360 if (vdp->xdf_xdev_iostat != NULL) 1361 kstat_waitq_to_runq( 1362 KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1363 vdp->xdf_f_act = bp->av_forw; 1364 bp->av_forw = NULL; 1365 } 1366 } 1367 1368 /* 1369 * Send the request(s) to the backend 1370 */ 1371 if (rreqready) { 1372 if (xvdi_ring_push_request(xbr)) { 1373 DPRINTF(IO_DBG, ("xdf_iostart: " 1374 "sent request(s) to backend\n")); 1375 xvdi_notify_oe(vdp->xdf_dip); 1376 } 1377 } 1378 1379 mutex_exit(&vdp->xdf_dev_lk); 1380} 1381 1382/* 1383 * populate a single blkif_request_t w/ a buf 1384 */ 1385static int 1386xdf_prepare_rreq(xdf_t *vdp, struct buf *bp, blkif_request_t *rreq) 1387{ 1388 int rval; 1389 grant_ref_t gr; 1390 uint8_t fsect, lsect; 1391 size_t bcnt; 1392 paddr_t dma_addr; 1393 off_t blk_off; 1394 dev_info_t *dip = vdp->xdf_dip; 1395 blkif_vdev_t vdev = xvdi_get_vdevnum(dip); 1396 v_req_t *vreq = BP2VREQ(bp); 1397 uint64_t blkno = vreq->v_blkno; 1398 uint_t ndmacs = vreq->v_ndmacs; 1399 ddi_acc_handle_t acchdl = vdp->xdf_xb_ring_hdl; 1400 int seg = 0; 1401 int isread = IS_READ(bp); 1402 1403 if (isread) 1404 ddi_put8(acchdl, &rreq->operation, BLKIF_OP_READ); 1405 else { 1406 switch (vreq->v_flush_diskcache) { 1407 case FLUSH_DISKCACHE: 1408 ddi_put8(acchdl, &rreq->operation, 1409 BLKIF_OP_FLUSH_DISKCACHE); 1410 ddi_put16(acchdl, &rreq->handle, vdev); 1411 ddi_put64(acchdl, &rreq->id, 1412 (uint64_t)(uintptr_t)(vreq->v_gs)); 1413 ddi_put8(acchdl, &rreq->nr_segments, 0); 1414 return (XF_COMP); 1415 case WRITE_BARRIER: 1416 ddi_put8(acchdl, &rreq->operation, 1417 BLKIF_OP_WRITE_BARRIER); 1418 break; 1419 default: 1420 if (!vdp->xdf_wce) 1421 ddi_put8(acchdl, &rreq->operation, 1422 BLKIF_OP_WRITE_BARRIER); 1423 else 1424 ddi_put8(acchdl, &rreq->operation, 1425 BLKIF_OP_WRITE); 1426 break; 1427 } 1428 } 1429 1430 ddi_put16(acchdl, &rreq->handle, vdev); 1431 ddi_put64(acchdl, &rreq->sector_number, blkno); 1432 ddi_put64(acchdl, &rreq->id, (uint64_t)(uintptr_t)(vreq->v_gs)); 1433 1434 /* 1435 * loop until all segments are populated or no more dma cookie in buf 1436 */ 1437 for (;;) { 1438 /* 1439 * Each segment of a blkif request can transfer up to 1440 * one 4K page of data. 1441 */ 1442 bcnt = vreq->v_dmac.dmac_size; 1443 ASSERT(bcnt <= PAGESIZE); 1444 ASSERT((bcnt % XB_BSIZE) == 0); 1445 dma_addr = vreq->v_dmac.dmac_laddress; 1446 blk_off = (uint_t)((paddr_t)XB_SEGOFFSET & dma_addr); 1447 ASSERT((blk_off & XB_BMASK) == 0); 1448 fsect = blk_off >> XB_BSHIFT; 1449 lsect = fsect + (bcnt >> XB_BSHIFT) - 1; 1450 ASSERT(fsect < XB_MAX_SEGLEN / XB_BSIZE && 1451 lsect < XB_MAX_SEGLEN / XB_BSIZE); 1452 DPRINTF(IO_DBG, (" ""seg%d: dmacS %lu blk_off %ld\n", 1453 seg, vreq->v_dmac.dmac_size, blk_off)); 1454 gr = gs_grant(vreq->v_gs, PATOMA(dma_addr) >> PAGESHIFT); 1455 ddi_put32(acchdl, &rreq->seg[seg].gref, gr); 1456 ddi_put8(acchdl, &rreq->seg[seg].first_sect, fsect); 1457 ddi_put8(acchdl, &rreq->seg[seg].last_sect, lsect); 1458 DPRINTF(IO_DBG, (" ""seg%d: fs %d ls %d gr %d dma 0x%"PRIx64 1459 "\n", seg, fsect, lsect, gr, dma_addr)); 1460 1461 blkno += (bcnt >> XB_BSHIFT); 1462 seg++; 1463 ASSERT(seg <= BLKIF_MAX_SEGMENTS_PER_REQUEST); 1464 if (--ndmacs) { 1465 ddi_dma_nextcookie(vreq->v_dmahdl, &vreq->v_dmac); 1466 continue; 1467 } 1468 1469 vreq->v_status = VREQ_DMAWIN_DONE; 1470 vreq->v_blkno = blkno; 1471 if (vreq->v_dmaw + 1 == vreq->v_ndmaws) 1472 /* last win */ 1473 rval = XF_COMP; 1474 else 1475 rval = XF_PARTIAL; 1476 break; 1477 } 1478 ddi_put8(acchdl, &rreq->nr_segments, seg); 1479 DPRINTF(IO_DBG, ("xdf_prepare_rreq: request id=%"PRIx64" ready\n", 1480 rreq->id)); 1481 1482 return (rval); 1483} 1484 1485#define XDF_QSEC 50000 /* .005 second */ 1486#define XDF_POLLCNT 12 /* loop for 12 times before time out */ 1487 1488static int 1489xdf_drain_io(xdf_t *vdp) 1490{ 1491 int pollc, rval; 1492 xendev_ring_t *xbr; 1493 1494 if (xdfdebug & SUSRES_DBG) 1495 xen_printf("xdf_drain_io: start\n"); 1496 1497 mutex_enter(&vdp->xdf_dev_lk); 1498 1499 if ((vdp->xdf_status != XD_READY) && (vdp->xdf_status != XD_SUSPEND)) 1500 goto out; 1501 1502 rval = 0; 1503 xbr = vdp->xdf_xb_ring; 1504 ASSERT(xbr != NULL); 1505 1506 for (pollc = 0; pollc < XDF_POLLCNT; pollc++) { 1507 if (xvdi_ring_has_unconsumed_responses(xbr)) { 1508 mutex_exit(&vdp->xdf_dev_lk); 1509 (void) xdf_intr((caddr_t)vdp); 1510 mutex_enter(&vdp->xdf_dev_lk); 1511 } 1512 if (!xvdi_ring_has_incomp_request(xbr)) 1513 goto out; 1514 1515#ifndef XPV_HVM_DRIVER 1516 (void) HYPERVISOR_yield(); 1517#endif /* XPV_HVM_DRIVER */ 1518 /* 1519 * file-backed devices can be slow 1520 */ 1521 drv_usecwait(XDF_QSEC << pollc); 1522 } 1523 cmn_err(CE_WARN, "xdf_polled_io: timeout"); 1524 rval = EIO; 1525out: 1526 mutex_exit(&vdp->xdf_dev_lk); 1527 if (xdfdebug & SUSRES_DBG) 1528 xen_printf("xdf_drain_io: end, err=%d\n", rval); 1529 return (rval); 1530} 1531 1532/* ARGSUSED5 */ 1533int 1534xdf_lb_rdwr(dev_info_t *devi, uchar_t cmd, void *bufp, 1535 diskaddr_t start, size_t reqlen, void *tg_cookie) 1536{ 1537 xdf_t *vdp; 1538 struct buf *bp; 1539 int err = 0; 1540 1541 vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)); 1542 if (vdp == NULL) 1543 return (ENXIO); 1544 1545 if ((start + (reqlen >> DEV_BSHIFT)) > vdp->xdf_pgeom.g_capacity) 1546 return (EINVAL); 1547 1548 bp = getrbuf(KM_SLEEP); 1549 if (cmd == TG_READ) 1550 bp->b_flags = B_BUSY | B_READ; 1551 else 1552 bp->b_flags = B_BUSY | B_WRITE; 1553 bp->b_un.b_addr = bufp; 1554 bp->b_bcount = reqlen; 1555 bp->b_blkno = start; 1556 bp->b_edev = DDI_DEV_T_NONE; /* don't have dev_t */ 1557 1558 mutex_enter(&vdp->xdf_dev_lk); 1559 if (vdp->xdf_xdev_iostat != NULL) 1560 kstat_waitq_enter(KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 1561 if (vdp->xdf_f_act == NULL) { 1562 vdp->xdf_f_act = vdp->xdf_l_act = bp; 1563 } else { 1564 vdp->xdf_l_act->av_forw = bp; 1565 vdp->xdf_l_act = bp; 1566 } 1567 mutex_exit(&vdp->xdf_dev_lk); 1568 xdf_iostart(vdp); 1569 err = biowait(bp); 1570 1571 ASSERT(bp->b_flags & B_DONE); 1572 1573 freerbuf(bp); 1574 return (err); 1575} 1576 1577/* 1578 * synthetic geometry 1579 */ 1580#define XDF_NSECTS 256 1581#define XDF_NHEADS 16 1582 1583static void 1584xdf_synthetic_pgeom(dev_info_t *devi, cmlb_geom_t *geomp) 1585{ 1586 xdf_t *vdp; 1587 uint_t ncyl; 1588 1589 vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)); 1590 1591 ncyl = vdp->xdf_xdev_nblocks / (XDF_NHEADS * XDF_NSECTS); 1592 1593 geomp->g_ncyl = ncyl == 0 ? 1 : ncyl; 1594 geomp->g_acyl = 0; 1595 geomp->g_nhead = XDF_NHEADS; 1596 geomp->g_secsize = XB_BSIZE; 1597 geomp->g_nsect = XDF_NSECTS; 1598 geomp->g_intrlv = 0; 1599 geomp->g_rpm = 7200; 1600 geomp->g_capacity = vdp->xdf_xdev_nblocks; 1601} 1602 1603static int 1604xdf_lb_getcap(dev_info_t *devi, diskaddr_t *capp) 1605{ 1606 xdf_t *vdp; 1607 1608 vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)); 1609 1610 if (vdp == NULL) 1611 return (ENXIO); 1612 1613 mutex_enter(&vdp->xdf_dev_lk); 1614 *capp = vdp->xdf_pgeom.g_capacity; 1615 DPRINTF(LBL_DBG, ("capacity %llu\n", *capp)); 1616 mutex_exit(&vdp->xdf_dev_lk); 1617 return (0); 1618} 1619 1620static int 1621xdf_lb_getpgeom(dev_info_t *devi, cmlb_geom_t *geomp) 1622{ 1623 xdf_t *vdp; 1624 1625 if ((vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi))) == NULL) 1626 return (ENXIO); 1627 *geomp = vdp->xdf_pgeom; 1628 return (0); 1629} 1630 1631/* 1632 * No real HBA, no geometry available from it 1633 */ 1634/*ARGSUSED*/ 1635static int 1636xdf_lb_getvgeom(dev_info_t *devi, cmlb_geom_t *geomp) 1637{ 1638 return (EINVAL); 1639} 1640 1641static int 1642xdf_lb_getattribute(dev_info_t *devi, tg_attribute_t *tgattributep) 1643{ 1644 xdf_t *vdp; 1645 1646 if (!(vdp = ddi_get_soft_state(vbd_ss, ddi_get_instance(devi)))) 1647 return (ENXIO); 1648 1649 if (XD_IS_RO(vdp)) 1650 tgattributep->media_is_writable = 0; 1651 else 1652 tgattributep->media_is_writable = 1; 1653 return (0); 1654} 1655 1656/* ARGSUSED3 */ 1657int 1658xdf_lb_getinfo(dev_info_t *devi, int cmd, void *arg, void *tg_cookie) 1659{ 1660 switch (cmd) { 1661 case TG_GETPHYGEOM: 1662 return (xdf_lb_getpgeom(devi, (cmlb_geom_t *)arg)); 1663 case TG_GETVIRTGEOM: 1664 return (xdf_lb_getvgeom(devi, (cmlb_geom_t *)arg)); 1665 case TG_GETCAPACITY: 1666 return (xdf_lb_getcap(devi, (diskaddr_t *)arg)); 1667 case TG_GETBLOCKSIZE: 1668 *(uint32_t *)arg = XB_BSIZE; 1669 return (0); 1670 case TG_GETATTR: 1671 return (xdf_lb_getattribute(devi, (tg_attribute_t *)arg)); 1672 default: 1673 return (ENOTTY); 1674 } 1675} 1676 1677/* 1678 * Kick-off connect process 1679 * Status should be XD_UNKNOWN or XD_CLOSED 1680 * On success, status will be changed to XD_INIT 1681 * On error, status won't be changed 1682 */ 1683static int 1684xdf_start_connect(xdf_t *vdp) 1685{ 1686 char *xsnode; 1687 grant_ref_t gref; 1688 xenbus_transaction_t xbt; 1689 int rv; 1690 dev_info_t *dip = vdp->xdf_dip; 1691 1692 if ((vdp->xdf_peer = xvdi_get_oeid(dip)) == (domid_t)-1) 1693 goto errout; 1694 1695 if (xvdi_alloc_evtchn(dip) != DDI_SUCCESS) { 1696 cmn_err(CE_WARN, "xdf@%s: failed to alloc event channel", 1697 ddi_get_name_addr(dip)); 1698 goto errout; 1699 } 1700 vdp->xdf_evtchn = xvdi_get_evtchn(dip); 1701#ifdef XPV_HVM_DRIVER 1702 ec_bind_evtchn_to_handler(vdp->xdf_evtchn, IPL_VBD, xdf_intr, vdp); 1703#else /* !XPV_HVM_DRIVER */ 1704 if (ddi_add_intr(dip, 0, NULL, NULL, xdf_intr, (caddr_t)vdp) != 1705 DDI_SUCCESS) { 1706 cmn_err(CE_WARN, "xdf_start_connect: xdf@%s: " 1707 "failed to add intr handler", ddi_get_name_addr(dip)); 1708 goto errout1; 1709 } 1710#endif /* !XPV_HVM_DRIVER */ 1711 1712 if (xvdi_alloc_ring(dip, BLKIF_RING_SIZE, 1713 sizeof (union blkif_sring_entry), &gref, &vdp->xdf_xb_ring) != 1714 DDI_SUCCESS) { 1715 cmn_err(CE_WARN, "xdf@%s: failed to alloc comm ring", 1716 ddi_get_name_addr(dip)); 1717 goto errout2; 1718 } 1719 vdp->xdf_xb_ring_hdl = vdp->xdf_xb_ring->xr_acc_hdl; /* ugly!! */ 1720 1721 /* 1722 * Write into xenstore the info needed by backend 1723 */ 1724 if ((xsnode = xvdi_get_xsname(dip)) == NULL) { 1725 cmn_err(CE_WARN, "xdf@%s: " 1726 "failed to get xenstore node path", 1727 ddi_get_name_addr(dip)); 1728 goto fail_trans; 1729 } 1730trans_retry: 1731 if (xenbus_transaction_start(&xbt)) { 1732 cmn_err(CE_WARN, "xdf@%s: failed to start transaction", 1733 ddi_get_name_addr(dip)); 1734 xvdi_fatal_error(dip, EIO, "transaction start"); 1735 goto fail_trans; 1736 } 1737 1738 if (rv = xenbus_printf(xbt, xsnode, "ring-ref", "%u", gref)) { 1739 cmn_err(CE_WARN, "xdf@%s: failed to write ring-ref", 1740 ddi_get_name_addr(dip)); 1741 xvdi_fatal_error(dip, rv, "writing ring-ref"); 1742 goto abort_trans; 1743 } 1744 1745 if (rv = xenbus_printf(xbt, xsnode, "event-channel", "%u", 1746 vdp->xdf_evtchn)) { 1747 cmn_err(CE_WARN, "xdf@%s: failed to write event-channel", 1748 ddi_get_name_addr(dip)); 1749 xvdi_fatal_error(dip, rv, "writing event-channel"); 1750 goto abort_trans; 1751 } 1752 1753 /* 1754 * "protocol" is written by the domain builder in the case of PV 1755 * domains. However, it is not written for HVM domains, so let's 1756 * write it here. 1757 */ 1758 if (rv = xenbus_printf(xbt, xsnode, "protocol", "%s", 1759 XEN_IO_PROTO_ABI_NATIVE)) { 1760 cmn_err(CE_WARN, "xdf@%s: failed to write protocol", 1761 ddi_get_name_addr(dip)); 1762 xvdi_fatal_error(dip, rv, "writing protocol"); 1763 goto abort_trans; 1764 } 1765 1766 if ((rv = xvdi_switch_state(dip, xbt, XenbusStateInitialised)) > 0) { 1767 cmn_err(CE_WARN, "xdf@%s: " 1768 "failed to switch state to XenbusStateInitialised", 1769 ddi_get_name_addr(dip)); 1770 xvdi_fatal_error(dip, rv, "writing state"); 1771 goto abort_trans; 1772 } 1773 1774 /* kick-off connect process */ 1775 if (rv = xenbus_transaction_end(xbt, 0)) { 1776 if (rv == EAGAIN) 1777 goto trans_retry; 1778 cmn_err(CE_WARN, "xdf@%s: failed to end transaction", 1779 ddi_get_name_addr(dip)); 1780 xvdi_fatal_error(dip, rv, "completing transaction"); 1781 goto fail_trans; 1782 } 1783 1784 ASSERT(mutex_owned(&vdp->xdf_cb_lk)); 1785 mutex_enter(&vdp->xdf_dev_lk); 1786 vdp->xdf_status = XD_INIT; 1787 mutex_exit(&vdp->xdf_dev_lk); 1788 1789 return (DDI_SUCCESS); 1790 1791abort_trans: 1792 (void) xenbus_transaction_end(xbt, 1); 1793fail_trans: 1794 xvdi_free_ring(vdp->xdf_xb_ring); 1795errout2: 1796#ifdef XPV_HVM_DRIVER 1797 ec_unbind_evtchn(vdp->xdf_evtchn); 1798#else /* !XPV_HVM_DRIVER */ 1799 (void) ddi_remove_intr(vdp->xdf_dip, 0, NULL); 1800#endif /* !XPV_HVM_DRIVER */ 1801errout1: 1802 xvdi_free_evtchn(dip); 1803errout: 1804 cmn_err(CE_WARN, "xdf@%s: fail to kick-off connecting", 1805 ddi_get_name_addr(dip)); 1806 return (DDI_FAILURE); 1807} 1808 1809/* 1810 * Kick-off disconnect process 1811 * Status won't be changed 1812 */ 1813static int 1814xdf_start_disconnect(xdf_t *vdp) 1815{ 1816 if (xvdi_switch_state(vdp->xdf_dip, XBT_NULL, XenbusStateClosed) > 0) { 1817 cmn_err(CE_WARN, "xdf@%s: fail to kick-off disconnecting", 1818 ddi_get_name_addr(vdp->xdf_dip)); 1819 return (DDI_FAILURE); 1820 } 1821 1822 return (DDI_SUCCESS); 1823} 1824 1825int 1826xdf_get_flush_block(xdf_t *vdp) 1827{ 1828 /* 1829 * Get a DEV_BSIZE aligned bufer 1830 */ 1831 vdp->xdf_flush_mem = kmem_alloc(DEV_BSIZE * 2, KM_SLEEP); 1832 vdp->xdf_cache_flush_block = 1833 (char *)P2ROUNDUP((uintptr_t)(vdp->xdf_flush_mem), DEV_BSIZE); 1834 if (xdf_lb_rdwr(vdp->xdf_dip, TG_READ, vdp->xdf_cache_flush_block, 1835 xdf_flush_block, DEV_BSIZE, NULL) != 0) 1836 return (DDI_FAILURE); 1837 return (DDI_SUCCESS); 1838} 1839 1840/* 1841 * Finish other initialization after we've connected to backend 1842 * Status should be XD_INIT before calling this routine 1843 * On success, status should be changed to XD_READY 1844 * On error, status should stay XD_INIT 1845 */ 1846static int 1847xdf_post_connect(xdf_t *vdp) 1848{ 1849 int rv; 1850 uint_t len; 1851 char *type; 1852 char *barrier; 1853 dev_info_t *devi = vdp->xdf_dip; 1854 1855 /* 1856 * Determine if feature barrier is supported by backend 1857 */ 1858 if (xenbus_read(XBT_NULL, xvdi_get_oename(devi), 1859 "feature-barrier", (void **)&barrier, &len) == 0) { 1860 vdp->xdf_feature_barrier = 1; 1861 kmem_free(barrier, len); 1862 } else { 1863 cmn_err(CE_NOTE, "xdf@%s: failed to read feature-barrier", 1864 ddi_get_name_addr(vdp->xdf_dip)); 1865 vdp->xdf_feature_barrier = 0; 1866 } 1867 1868 /* probe backend */ 1869 if (rv = xenbus_gather(XBT_NULL, xvdi_get_oename(devi), 1870 "sectors", "%"SCNu64, &vdp->xdf_xdev_nblocks, 1871 "info", "%u", &vdp->xdf_xdev_info, NULL)) { 1872 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1873 "cannot read backend info", ddi_get_name_addr(devi)); 1874 xvdi_fatal_error(devi, rv, "reading backend info"); 1875 return (DDI_FAILURE); 1876 } 1877 1878 /* 1879 * Make sure that the device we're connecting isn't smaller than 1880 * the old connected device. 1881 */ 1882 if (vdp->xdf_xdev_nblocks < vdp->xdf_pgeom.g_capacity) { 1883 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1884 "backend disk device shrank", ddi_get_name_addr(devi)); 1885 /* XXX: call xvdi_fatal_error() here? */ 1886 xvdi_fatal_error(devi, rv, "reading backend info"); 1887 return (DDI_FAILURE); 1888 } 1889 1890#ifdef _ILP32 1891 if (vdp->xdf_xdev_nblocks > DK_MAX_BLOCKS) { 1892 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1893 "backend disk device too large with %llu blocks for" 1894 " 32-bit kernel", ddi_get_name_addr(devi), 1895 vdp->xdf_xdev_nblocks); 1896 xvdi_fatal_error(devi, rv, "reading backend info"); 1897 return (DDI_FAILURE); 1898 } 1899#endif 1900 1901 1902 /* 1903 * Only update the physical geometry to reflect the new device 1904 * size if this is the first time we're connecting to the backend 1905 * device. Once we assign a physical geometry to a device it stays 1906 * fixed until: 1907 * - we get detach and re-attached (at which point we 1908 * automatically assign a new physical geometry). 1909 * - someone calls TG_SETPHYGEOM to explicity set the 1910 * physical geometry. 1911 */ 1912 if (vdp->xdf_pgeom.g_capacity == 0) 1913 xdf_synthetic_pgeom(devi, &vdp->xdf_pgeom); 1914 1915 /* fix disk type */ 1916 if (xenbus_read(XBT_NULL, xvdi_get_xsname(devi), "device-type", 1917 (void **)&type, &len) != 0) { 1918 cmn_err(CE_WARN, "xdf_post_connect: xdf@%s: " 1919 "cannot read device-type", ddi_get_name_addr(devi)); 1920 xvdi_fatal_error(devi, rv, "reading device-type"); 1921 return (DDI_FAILURE); 1922 } 1923 if (strcmp(type, "cdrom") == 0) 1924 vdp->xdf_xdev_info |= VDISK_CDROM; 1925 kmem_free(type, len); 1926 1927 /* 1928 * We've created all the minor nodes via cmlb_attach() using default 1929 * value in xdf_attach() to make it possible to block in xdf_open(), 1930 * in case there's anyone (say, booting thread) ever trying to open 1931 * it before connected to backend. We will refresh all those minor 1932 * nodes w/ latest info we've got now when we are almost connected. 1933 * 1934 * Don't do this when xdf is already opened by someone (could happen 1935 * during resume), for that cmlb_attach() will invalid the label info 1936 * and confuse those who has already opened the node, which is bad. 1937 */ 1938 if (!xdf_isopen(vdp, -1) && (XD_IS_CD(vdp) || XD_IS_RM(vdp))) { 1939 /* re-init cmlb w/ latest info we got from backend */ 1940 if (cmlb_attach(devi, &xdf_lb_ops, 1941 XD_IS_CD(vdp) ? DTYPE_RODIRECT : DTYPE_DIRECT, 1942 XD_IS_RM(vdp), 1, 1943 XD_IS_CD(vdp) ? DDI_NT_CD_XVMD : DDI_NT_BLOCK_XVMD, 1944#if defined(XPV_HVM_DRIVER) 1945 CMLB_CREATE_ALTSLICE_VTOC_16_DTYPE_DIRECT | 1946 CMLB_INTERNAL_MINOR_NODES, 1947#else /* !XPV_HVM_DRIVER */ 1948 CMLB_FAKE_LABEL_ONE_PARTITION, 1949#endif /* !XPV_HVM_DRIVER */ 1950 vdp->xdf_vd_lbl, NULL) != 0) { 1951 cmn_err(CE_WARN, "xdf@%s: cmlb attach failed", 1952 ddi_get_name_addr(devi)); 1953 return (DDI_FAILURE); 1954 } 1955 } 1956 1957 /* mark vbd is ready for I/O */ 1958 ASSERT(mutex_owned(&vdp->xdf_cb_lk)); 1959 mutex_enter(&vdp->xdf_dev_lk); 1960 vdp->xdf_status = XD_READY; 1961 mutex_exit(&vdp->xdf_dev_lk); 1962 /* 1963 * If backend has feature-barrier, see if it supports disk 1964 * cache flush op. 1965 */ 1966 vdp->xdf_flush_supported = 0; 1967 if (vdp->xdf_feature_barrier) { 1968 /* 1969 * Pretend we already know flush is supported so probe 1970 * will attempt the correct op. 1971 */ 1972 vdp->xdf_flush_supported = 1; 1973 if (xdf_lb_rdwr(vdp->xdf_dip, TG_WRITE, NULL, 0, 0, 0) == 0) { 1974 vdp->xdf_flush_supported = 1; 1975 } else { 1976 vdp->xdf_flush_supported = 0; 1977 /* 1978 * If the other end does not support the cache flush op 1979 * then we must use a barrier-write to force disk 1980 * cache flushing. Barrier writes require that a data 1981 * block actually be written. 1982 * Cache a block to barrier-write when we are 1983 * asked to perform a flush. 1984 * XXX - would it be better to just copy 1 block 1985 * (512 bytes) from whatever write we did last 1986 * and rewrite that block? 1987 */ 1988 if (xdf_get_flush_block(vdp) != DDI_SUCCESS) 1989 return (DDI_FAILURE); 1990 } 1991 } 1992 1993 cmn_err(CE_CONT, "?xdf@%s: %"PRIu64" blocks", ddi_get_name_addr(devi), 1994 (uint64_t)vdp->xdf_xdev_nblocks); 1995 1996 return (DDI_SUCCESS); 1997} 1998 1999/* 2000 * Finish other uninitialization after we've disconnected from backend 2001 * when status is XD_CLOSING or XD_INIT. After returns, status is XD_CLOSED 2002 */ 2003static void 2004xdf_post_disconnect(xdf_t *vdp) 2005{ 2006#ifdef XPV_HVM_DRIVER 2007 ec_unbind_evtchn(vdp->xdf_evtchn); 2008#else /* !XPV_HVM_DRIVER */ 2009 (void) ddi_remove_intr(vdp->xdf_dip, 0, NULL); 2010#endif /* !XPV_HVM_DRIVER */ 2011 xvdi_free_evtchn(vdp->xdf_dip); 2012 xvdi_free_ring(vdp->xdf_xb_ring); 2013 vdp->xdf_xb_ring = NULL; 2014 vdp->xdf_xb_ring_hdl = NULL; 2015 vdp->xdf_peer = (domid_t)-1; 2016 2017 ASSERT(mutex_owned(&vdp->xdf_cb_lk)); 2018 mutex_enter(&vdp->xdf_dev_lk); 2019 vdp->xdf_status = XD_CLOSED; 2020 mutex_exit(&vdp->xdf_dev_lk); 2021} 2022 2023/*ARGSUSED*/ 2024static void 2025xdf_oe_change(dev_info_t *dip, ddi_eventcookie_t id, void *arg, void *impl_data) 2026{ 2027 XenbusState new_state = *(XenbusState *)impl_data; 2028 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2029 boolean_t unexpect_die = B_FALSE; 2030 int status; 2031 2032 DPRINTF(DDI_DBG, ("xdf@%s: otherend state change to %d!\n", 2033 ddi_get_name_addr(dip), new_state)); 2034 2035 mutex_enter(&vdp->xdf_cb_lk); 2036 2037 if (xdf_check_state_transition(vdp, new_state) == DDI_FAILURE) { 2038 mutex_exit(&vdp->xdf_cb_lk); 2039 return; 2040 } 2041 2042 switch (new_state) { 2043 case XenbusStateInitialising: 2044 ASSERT(vdp->xdf_status == XD_CLOSED); 2045 /* 2046 * backend recovered from a previous failure, 2047 * kick-off connect process again 2048 */ 2049 if (xdf_start_connect(vdp) != DDI_SUCCESS) { 2050 cmn_err(CE_WARN, "xdf@%s:" 2051 " failed to start reconnecting to backend", 2052 ddi_get_name_addr(dip)); 2053 } 2054 break; 2055 case XenbusStateConnected: 2056 ASSERT(vdp->xdf_status == XD_INIT); 2057 (void) xvdi_switch_state(dip, XBT_NULL, XenbusStateConnected); 2058 /* finish final init after connect */ 2059 if (xdf_post_connect(vdp) != DDI_SUCCESS) 2060 (void) xdf_start_disconnect(vdp); 2061 break; 2062 case XenbusStateClosing: 2063 if (vdp->xdf_status == XD_READY) { 2064 mutex_enter(&vdp->xdf_dev_lk); 2065 if (xdf_isopen(vdp, -1)) { 2066 cmn_err(CE_NOTE, "xdf@%s: hot-unplug failed, " 2067 "still in use", ddi_get_name_addr(dip)); 2068 mutex_exit(&vdp->xdf_dev_lk); 2069 break; 2070 } else { 2071 vdp->xdf_status = XD_CLOSING; 2072 } 2073 mutex_exit(&vdp->xdf_dev_lk); 2074 } 2075 (void) xdf_start_disconnect(vdp); 2076 break; 2077 case XenbusStateClosed: 2078 /* first check if BE closed unexpectedly */ 2079 mutex_enter(&vdp->xdf_dev_lk); 2080 if (xdf_isopen(vdp, -1)) { 2081 unexpect_die = B_TRUE; 2082 unexpectedie(vdp); 2083 cmn_err(CE_WARN, "xdf@%s: backend closed, " 2084 "reconnecting...", ddi_get_name_addr(dip)); 2085 } 2086 mutex_exit(&vdp->xdf_dev_lk); 2087 2088 if (vdp->xdf_status == XD_READY) { 2089 mutex_enter(&vdp->xdf_dev_lk); 2090 vdp->xdf_status = XD_CLOSING; 2091 mutex_exit(&vdp->xdf_dev_lk); 2092 2093#ifdef DOMU_BACKEND 2094 (void) xvdi_post_event(dip, XEN_HP_REMOVE); 2095#endif 2096 2097 xdf_post_disconnect(vdp); 2098 (void) xvdi_switch_state(dip, XBT_NULL, 2099 XenbusStateClosed); 2100 } else if ((vdp->xdf_status == XD_INIT) || 2101 (vdp->xdf_status == XD_CLOSING)) { 2102 xdf_post_disconnect(vdp); 2103 } else { 2104 mutex_enter(&vdp->xdf_dev_lk); 2105 vdp->xdf_status = XD_CLOSED; 2106 mutex_exit(&vdp->xdf_dev_lk); 2107 } 2108 } 2109 2110 /* notify anybody waiting for oe state change */ 2111 mutex_enter(&vdp->xdf_dev_lk); 2112 cv_broadcast(&vdp->xdf_dev_cv); 2113 mutex_exit(&vdp->xdf_dev_lk); 2114 2115 status = vdp->xdf_status; 2116 mutex_exit(&vdp->xdf_cb_lk); 2117 2118 if (status == XD_READY) { 2119 xdf_iostart(vdp); 2120 } else if ((status == XD_CLOSED) && !unexpect_die) { 2121 /* interface is closed successfully, remove all minor nodes */ 2122 if (vdp->xdf_vd_lbl != NULL) { 2123 cmlb_detach(vdp->xdf_vd_lbl, NULL); 2124 cmlb_free_handle(&vdp->xdf_vd_lbl); 2125 vdp->xdf_vd_lbl = NULL; 2126 } 2127 } 2128} 2129 2130/* check if partition is open, -1 - check all partitions on the disk */ 2131static boolean_t 2132xdf_isopen(xdf_t *vdp, int partition) 2133{ 2134 int i; 2135 ulong_t parbit; 2136 boolean_t rval = B_FALSE; 2137 2138 ASSERT((partition == -1) || 2139 ((partition >= 0) || (partition < XDF_PEXT))); 2140 2141 if (partition == -1) 2142 parbit = (ulong_t)-1; 2143 else 2144 parbit = 1 << partition; 2145 2146 for (i = 0; i < OTYPCNT; i++) { 2147 if (vdp->xdf_vd_open[i] & parbit) 2148 rval = B_TRUE; 2149 } 2150 2151 return (rval); 2152} 2153 2154/* 2155 * Xdf_check_state_transition will check the XenbusState change to see 2156 * if the change is a valid transition or not. 2157 * The new state is written by backend domain, or by running xenstore-write 2158 * to change it manually in dom0 2159 */ 2160static int 2161xdf_check_state_transition(xdf_t *vdp, XenbusState oestate) 2162{ 2163 int status; 2164 int stcheck; 2165#define STOK 0 /* need further process */ 2166#define STNOP 1 /* no action need taking */ 2167#define STBUG 2 /* unexpected state change, could be a bug */ 2168 2169 status = vdp->xdf_status; 2170 stcheck = STOK; 2171 2172 switch (status) { 2173 case XD_UNKNOWN: 2174 if ((oestate == XenbusStateUnknown) || 2175 (oestate == XenbusStateConnected)) 2176 stcheck = STBUG; 2177 else if ((oestate == XenbusStateInitialising) || 2178 (oestate == XenbusStateInitWait) || 2179 (oestate == XenbusStateInitialised)) 2180 stcheck = STNOP; 2181 break; 2182 case XD_INIT: 2183 if (oestate == XenbusStateUnknown) 2184 stcheck = STBUG; 2185 else if ((oestate == XenbusStateInitialising) || 2186 (oestate == XenbusStateInitWait) || 2187 (oestate == XenbusStateInitialised)) 2188 stcheck = STNOP; 2189 break; 2190 case XD_READY: 2191 if ((oestate == XenbusStateUnknown) || 2192 (oestate == XenbusStateInitialising) || 2193 (oestate == XenbusStateInitWait) || 2194 (oestate == XenbusStateInitialised)) 2195 stcheck = STBUG; 2196 else if (oestate == XenbusStateConnected) 2197 stcheck = STNOP; 2198 break; 2199 case XD_CLOSING: 2200 if ((oestate == XenbusStateUnknown) || 2201 (oestate == XenbusStateInitialising) || 2202 (oestate == XenbusStateInitWait) || 2203 (oestate == XenbusStateInitialised) || 2204 (oestate == XenbusStateConnected)) 2205 stcheck = STBUG; 2206 else if (oestate == XenbusStateClosing) 2207 stcheck = STNOP; 2208 break; 2209 case XD_CLOSED: 2210 if ((oestate == XenbusStateUnknown) || 2211 (oestate == XenbusStateConnected)) 2212 stcheck = STBUG; 2213 else if ((oestate == XenbusStateInitWait) || 2214 (oestate == XenbusStateInitialised) || 2215 (oestate == XenbusStateClosing) || 2216 (oestate == XenbusStateClosed)) 2217 stcheck = STNOP; 2218 break; 2219 case XD_SUSPEND: 2220 default: 2221 stcheck = STBUG; 2222 } 2223 2224 if (stcheck == STOK) 2225 return (DDI_SUCCESS); 2226 2227 if (stcheck == STBUG) 2228 cmn_err(CE_NOTE, "xdf@%s: unexpected otherend " 2229 "state change to %d!, when status is %d", 2230 ddi_get_name_addr(vdp->xdf_dip), oestate, status); 2231 2232 return (DDI_FAILURE); 2233} 2234 2235static int 2236xdf_connect(xdf_t *vdp, boolean_t wait) 2237{ 2238 ASSERT(mutex_owned(&vdp->xdf_dev_lk)); 2239 while (vdp->xdf_status != XD_READY) { 2240 if (!wait || (vdp->xdf_status > XD_READY)) 2241 break; 2242 2243 if (cv_wait_sig(&vdp->xdf_dev_cv, &vdp->xdf_dev_lk) == 0) 2244 break; 2245 } 2246 2247 return (vdp->xdf_status); 2248} 2249 2250/* 2251 * callback func when DMA/GTE resources is available 2252 * 2253 * Note: we only register one callback function to grant table subsystem 2254 * since we only have one 'struct gnttab_free_callback' in xdf_t. 2255 */ 2256static int 2257xdf_dmacallback(caddr_t arg) 2258{ 2259 xdf_t *vdp = (xdf_t *)arg; 2260 ASSERT(vdp != NULL); 2261 2262 DPRINTF(DMA_DBG, ("xdf@%s: DMA callback started\n", 2263 ddi_get_name_addr(vdp->xdf_dip))); 2264 2265 ddi_trigger_softintr(vdp->xdf_softintr_id); 2266 return (DDI_DMA_CALLBACK_DONE); 2267} 2268 2269static uint_t 2270xdf_iorestart(caddr_t arg) 2271{ 2272 xdf_t *vdp = (xdf_t *)arg; 2273 2274 ASSERT(vdp != NULL); 2275 2276 mutex_enter(&vdp->xdf_dev_lk); 2277 ASSERT(ISDMACBON(vdp)); 2278 SETDMACBOFF(vdp); 2279 mutex_exit(&vdp->xdf_dev_lk); 2280 2281 xdf_iostart(vdp); 2282 2283 return (DDI_INTR_CLAIMED); 2284} 2285 2286static void 2287xdf_timeout_handler(void *arg) 2288{ 2289 xdf_t *vdp = arg; 2290 2291 mutex_enter(&vdp->xdf_dev_lk); 2292 vdp->xdf_timeout_id = 0; 2293 mutex_exit(&vdp->xdf_dev_lk); 2294 2295 /* new timeout thread could be re-scheduled */ 2296 xdf_iostart(vdp); 2297} 2298 2299/* 2300 * Alloc a vreq for this bp 2301 * bp->av_back contains the pointer to the vreq upon return 2302 */ 2303static v_req_t * 2304vreq_get(xdf_t *vdp, buf_t *bp) 2305{ 2306 v_req_t *vreq = NULL; 2307 2308 ASSERT(BP2VREQ(bp) == NULL); 2309 2310 vreq = kmem_cache_alloc(xdf_vreq_cache, KM_NOSLEEP); 2311 if (vreq == NULL) { 2312 if (vdp->xdf_timeout_id == 0) 2313 /* restart I/O after one second */ 2314 vdp->xdf_timeout_id = 2315 timeout(xdf_timeout_handler, vdp, hz); 2316 return (NULL); 2317 } 2318 bzero(vreq, sizeof (v_req_t)); 2319 2320 list_insert_head(&vdp->xdf_vreq_act, (void *)vreq); 2321 bp->av_back = (buf_t *)vreq; 2322 vreq->v_buf = bp; 2323 vreq->v_status = VREQ_INIT; 2324 /* init of other fields in vreq is up to the caller */ 2325 2326 return (vreq); 2327} 2328 2329static void 2330vreq_free(xdf_t *vdp, v_req_t *vreq) 2331{ 2332 buf_t *bp = vreq->v_buf; 2333 2334 list_remove(&vdp->xdf_vreq_act, (void *)vreq); 2335 2336 if (vreq->v_flush_diskcache == FLUSH_DISKCACHE) 2337 goto done; 2338 2339 switch (vreq->v_status) { 2340 case VREQ_DMAWIN_DONE: 2341 case VREQ_GS_ALLOCED: 2342 case VREQ_DMABUF_BOUND: 2343 (void) ddi_dma_unbind_handle(vreq->v_dmahdl); 2344 /*FALLTHRU*/ 2345 case VREQ_DMAMEM_ALLOCED: 2346 if (!ALIGNED_XFER(bp)) { 2347 ASSERT(vreq->v_abuf != NULL); 2348 if (!IS_ERROR(bp) && IS_READ(bp)) 2349 bcopy(vreq->v_abuf, bp->b_un.b_addr, 2350 bp->b_bcount); 2351 ddi_dma_mem_free(&vreq->v_align); 2352 } 2353 /*FALLTHRU*/ 2354 case VREQ_MEMDMAHDL_ALLOCED: 2355 if (!ALIGNED_XFER(bp)) 2356 ddi_dma_free_handle(&vreq->v_memdmahdl); 2357 /*FALLTHRU*/ 2358 case VREQ_DMAHDL_ALLOCED: 2359 ddi_dma_free_handle(&vreq->v_dmahdl); 2360 break; 2361 default: 2362 break; 2363 } 2364done: 2365 vreq->v_buf->av_back = NULL; 2366 kmem_cache_free(xdf_vreq_cache, vreq); 2367} 2368 2369/* 2370 * Initalize the DMA and grant table resources for the buf 2371 */ 2372static int 2373vreq_setup(xdf_t *vdp, v_req_t *vreq) 2374{ 2375 int rc; 2376 ddi_dma_attr_t dmaattr; 2377 uint_t ndcs, ndws; 2378 ddi_dma_handle_t dh; 2379 ddi_dma_handle_t mdh; 2380 ddi_dma_cookie_t dc; 2381 ddi_acc_handle_t abh; 2382 caddr_t aba; 2383 ge_slot_t *gs; 2384 size_t bufsz; 2385 off_t off; 2386 size_t sz; 2387 buf_t *bp = vreq->v_buf; 2388 int dma_flags = (IS_READ(bp) ? DDI_DMA_READ : DDI_DMA_WRITE) | 2389 DDI_DMA_STREAMING | DDI_DMA_PARTIAL; 2390 2391 switch (vreq->v_status) { 2392 case VREQ_INIT: 2393 if (IS_FLUSH_DISKCACHE(bp)) { 2394 if ((gs = gs_get(vdp, IS_READ(bp))) == NULL) { 2395 DPRINTF(DMA_DBG, ( 2396 "xdf@%s: get ge_slotfailed\n", 2397 ddi_get_name_addr(vdp->xdf_dip))); 2398 return (DDI_FAILURE); 2399 } 2400 vreq->v_blkno = 0; 2401 vreq->v_nslots = 1; 2402 vreq->v_gs = gs; 2403 vreq->v_flush_diskcache = FLUSH_DISKCACHE; 2404 vreq->v_status = VREQ_GS_ALLOCED; 2405 gs->vreq = vreq; 2406 return (DDI_SUCCESS); 2407 } 2408 2409 if (IS_WRITE_BARRIER(vdp, bp)) 2410 vreq->v_flush_diskcache = WRITE_BARRIER; 2411 vreq->v_blkno = bp->b_blkno + 2412 (diskaddr_t)(uintptr_t)bp->b_private; 2413 bp->b_private = NULL; 2414 /* See if we wrote new data to our flush block */ 2415 if (!IS_READ(bp) && USE_WRITE_BARRIER(vdp)) 2416 check_fbwrite(vdp, bp, vreq->v_blkno); 2417 vreq->v_status = VREQ_INIT_DONE; 2418 /*FALLTHRU*/ 2419 2420 case VREQ_INIT_DONE: 2421 /* 2422 * alloc DMA handle 2423 */ 2424 rc = ddi_dma_alloc_handle(vdp->xdf_dip, &xb_dma_attr, 2425 xdf_dmacallback, (caddr_t)vdp, &dh); 2426 if (rc != DDI_SUCCESS) { 2427 SETDMACBON(vdp); 2428 DPRINTF(DMA_DBG, ("xdf@%s: DMA handle alloc failed\n", 2429 ddi_get_name_addr(vdp->xdf_dip))); 2430 return (DDI_FAILURE); 2431 } 2432 2433 vreq->v_dmahdl = dh; 2434 vreq->v_status = VREQ_DMAHDL_ALLOCED; 2435 /*FALLTHRU*/ 2436 2437 case VREQ_DMAHDL_ALLOCED: 2438 /* 2439 * alloc dma handle for 512-byte aligned buf 2440 */ 2441 if (!ALIGNED_XFER(bp)) { 2442 /* 2443 * XXPV: we need to temporarily enlarge the seg 2444 * boundary and s/g length to work round CR6381968 2445 */ 2446 dmaattr = xb_dma_attr; 2447 dmaattr.dma_attr_seg = (uint64_t)-1; 2448 dmaattr.dma_attr_sgllen = INT_MAX; 2449 rc = ddi_dma_alloc_handle(vdp->xdf_dip, &dmaattr, 2450 xdf_dmacallback, (caddr_t)vdp, &mdh); 2451 if (rc != DDI_SUCCESS) { 2452 SETDMACBON(vdp); 2453 DPRINTF(DMA_DBG, ("xdf@%s: unaligned buf DMA" 2454 "handle alloc failed\n", 2455 ddi_get_name_addr(vdp->xdf_dip))); 2456 return (DDI_FAILURE); 2457 } 2458 vreq->v_memdmahdl = mdh; 2459 vreq->v_status = VREQ_MEMDMAHDL_ALLOCED; 2460 } 2461 /*FALLTHRU*/ 2462 2463 case VREQ_MEMDMAHDL_ALLOCED: 2464 /* 2465 * alloc 512-byte aligned buf 2466 */ 2467 if (!ALIGNED_XFER(bp)) { 2468 if (bp->b_flags & (B_PAGEIO | B_PHYS)) 2469 bp_mapin(bp); 2470 2471 rc = ddi_dma_mem_alloc(vreq->v_memdmahdl, 2472 roundup(bp->b_bcount, XB_BSIZE), &xc_acc_attr, 2473 DDI_DMA_STREAMING, xdf_dmacallback, (caddr_t)vdp, 2474 &aba, &bufsz, &abh); 2475 if (rc != DDI_SUCCESS) { 2476 SETDMACBON(vdp); 2477 DPRINTF(DMA_DBG, ( 2478 "xdf@%s: DMA mem allocation failed\n", 2479 ddi_get_name_addr(vdp->xdf_dip))); 2480 return (DDI_FAILURE); 2481 } 2482 2483 vreq->v_abuf = aba; 2484 vreq->v_align = abh; 2485 vreq->v_status = VREQ_DMAMEM_ALLOCED; 2486 2487 ASSERT(bufsz >= bp->b_bcount); 2488 if (!IS_READ(bp)) 2489 bcopy(bp->b_un.b_addr, vreq->v_abuf, 2490 bp->b_bcount); 2491 } 2492 /*FALLTHRU*/ 2493 2494 case VREQ_DMAMEM_ALLOCED: 2495 /* 2496 * dma bind 2497 */ 2498 if (ALIGNED_XFER(bp)) { 2499 rc = ddi_dma_buf_bind_handle(vreq->v_dmahdl, bp, 2500 dma_flags, xdf_dmacallback, (caddr_t)vdp, 2501 &dc, &ndcs); 2502 } else { 2503 rc = ddi_dma_addr_bind_handle(vreq->v_dmahdl, 2504 NULL, vreq->v_abuf, bp->b_bcount, dma_flags, 2505 xdf_dmacallback, (caddr_t)vdp, &dc, &ndcs); 2506 } 2507 if (rc == DDI_DMA_MAPPED || rc == DDI_DMA_PARTIAL_MAP) { 2508 /* get num of dma windows */ 2509 if (rc == DDI_DMA_PARTIAL_MAP) { 2510 rc = ddi_dma_numwin(vreq->v_dmahdl, &ndws); 2511 ASSERT(rc == DDI_SUCCESS); 2512 } else { 2513 ndws = 1; 2514 } 2515 } else { 2516 SETDMACBON(vdp); 2517 DPRINTF(DMA_DBG, ("xdf@%s: DMA bind failed\n", 2518 ddi_get_name_addr(vdp->xdf_dip))); 2519 return (DDI_FAILURE); 2520 } 2521 2522 vreq->v_dmac = dc; 2523 vreq->v_dmaw = 0; 2524 vreq->v_ndmacs = ndcs; 2525 vreq->v_ndmaws = ndws; 2526 vreq->v_nslots = ndws; 2527 vreq->v_status = VREQ_DMABUF_BOUND; 2528 /*FALLTHRU*/ 2529 2530 case VREQ_DMABUF_BOUND: 2531 /* 2532 * get ge_slot, callback is set upon failure from gs_get(), 2533 * if not set previously 2534 */ 2535 if ((gs = gs_get(vdp, IS_READ(bp))) == NULL) { 2536 DPRINTF(DMA_DBG, ("xdf@%s: get ge_slot failed\n", 2537 ddi_get_name_addr(vdp->xdf_dip))); 2538 return (DDI_FAILURE); 2539 } 2540 2541 vreq->v_gs = gs; 2542 gs->vreq = vreq; 2543 vreq->v_status = VREQ_GS_ALLOCED; 2544 break; 2545 2546 case VREQ_GS_ALLOCED: 2547 /* nothing need to be done */ 2548 break; 2549 2550 case VREQ_DMAWIN_DONE: 2551 /* 2552 * move to the next dma window 2553 */ 2554 ASSERT((vreq->v_dmaw + 1) < vreq->v_ndmaws); 2555 2556 /* get a ge_slot for this DMA window */ 2557 if ((gs = gs_get(vdp, IS_READ(bp))) == NULL) { 2558 DPRINTF(DMA_DBG, ("xdf@%s: get ge_slot failed\n", 2559 ddi_get_name_addr(vdp->xdf_dip))); 2560 return (DDI_FAILURE); 2561 } 2562 2563 vreq->v_gs = gs; 2564 gs->vreq = vreq; 2565 vreq->v_dmaw++; 2566 rc = ddi_dma_getwin(vreq->v_dmahdl, vreq->v_dmaw, &off, &sz, 2567 &vreq->v_dmac, &vreq->v_ndmacs); 2568 ASSERT(rc == DDI_SUCCESS); 2569 vreq->v_status = VREQ_GS_ALLOCED; 2570 break; 2571 2572 default: 2573 return (DDI_FAILURE); 2574 } 2575 2576 return (DDI_SUCCESS); 2577} 2578 2579static ge_slot_t * 2580gs_get(xdf_t *vdp, int isread) 2581{ 2582 grant_ref_t gh; 2583 ge_slot_t *gs; 2584 2585 /* try to alloc GTEs needed in this slot, first */ 2586 if (gnttab_alloc_grant_references( 2587 BLKIF_MAX_SEGMENTS_PER_REQUEST, &gh) == -1) { 2588 if (vdp->xdf_gnt_callback.next == NULL) { 2589 SETDMACBON(vdp); 2590 gnttab_request_free_callback( 2591 &vdp->xdf_gnt_callback, 2592 (void (*)(void *))xdf_dmacallback, 2593 (void *)vdp, 2594 BLKIF_MAX_SEGMENTS_PER_REQUEST); 2595 } 2596 return (NULL); 2597 } 2598 2599 gs = kmem_cache_alloc(xdf_gs_cache, KM_NOSLEEP); 2600 if (gs == NULL) { 2601 gnttab_free_grant_references(gh); 2602 if (vdp->xdf_timeout_id == 0) 2603 /* restart I/O after one second */ 2604 vdp->xdf_timeout_id = 2605 timeout(xdf_timeout_handler, vdp, hz); 2606 return (NULL); 2607 } 2608 2609 /* init gs_slot */ 2610 list_insert_head(&vdp->xdf_gs_act, (void *)gs); 2611 gs->oeid = vdp->xdf_peer; 2612 gs->isread = isread; 2613 gs->ghead = gh; 2614 gs->ngrefs = 0; 2615 2616 return (gs); 2617} 2618 2619static void 2620gs_free(xdf_t *vdp, ge_slot_t *gs) 2621{ 2622 int i; 2623 grant_ref_t *gp = gs->ge; 2624 int ngrefs = gs->ngrefs; 2625 boolean_t isread = gs->isread; 2626 2627 list_remove(&vdp->xdf_gs_act, (void *)gs); 2628 2629 /* release all grant table entry resources used in this slot */ 2630 for (i = 0; i < ngrefs; i++, gp++) 2631 gnttab_end_foreign_access(*gp, !isread, 0); 2632 gnttab_free_grant_references(gs->ghead); 2633 2634 kmem_cache_free(xdf_gs_cache, (void *)gs); 2635} 2636 2637static grant_ref_t 2638gs_grant(ge_slot_t *gs, mfn_t mfn) 2639{ 2640 grant_ref_t gr = gnttab_claim_grant_reference(&gs->ghead); 2641 2642 ASSERT(gr != -1); 2643 ASSERT(gs->ngrefs < BLKIF_MAX_SEGMENTS_PER_REQUEST); 2644 gs->ge[gs->ngrefs++] = gr; 2645 gnttab_grant_foreign_access_ref(gr, gs->oeid, mfn, !gs->isread); 2646 2647 return (gr); 2648} 2649 2650static void 2651unexpectedie(xdf_t *vdp) 2652{ 2653 /* clean up I/Os in ring that have responses */ 2654 if (xvdi_ring_has_unconsumed_responses(vdp->xdf_xb_ring)) { 2655 mutex_exit(&vdp->xdf_dev_lk); 2656 (void) xdf_intr((caddr_t)vdp); 2657 mutex_enter(&vdp->xdf_dev_lk); 2658 } 2659 2660 /* free up all grant table entries */ 2661 while (!list_is_empty(&vdp->xdf_gs_act)) 2662 gs_free(vdp, list_head(&vdp->xdf_gs_act)); 2663 2664 /* 2665 * move bp back to active list orderly 2666 * vreq_busy is updated in vreq_free() 2667 */ 2668 while (!list_is_empty(&vdp->xdf_vreq_act)) { 2669 v_req_t *vreq = list_head(&vdp->xdf_vreq_act); 2670 buf_t *bp = vreq->v_buf; 2671 2672 bp->av_back = NULL; 2673 bp->b_resid = bp->b_bcount; 2674 if (vdp->xdf_f_act == NULL) { 2675 vdp->xdf_f_act = vdp->xdf_l_act = bp; 2676 } else { 2677 /* move to the head of list */ 2678 bp->av_forw = vdp->xdf_f_act; 2679 vdp->xdf_f_act = bp; 2680 } 2681 if (vdp->xdf_xdev_iostat != NULL) 2682 kstat_runq_back_to_waitq( 2683 KSTAT_IO_PTR(vdp->xdf_xdev_iostat)); 2684 vreq_free(vdp, vreq); 2685 } 2686} 2687 2688static void 2689xdfmin(struct buf *bp) 2690{ 2691 if (bp->b_bcount > xdf_maxphys) 2692 bp->b_bcount = xdf_maxphys; 2693} 2694 2695void 2696xdf_kstat_delete(dev_info_t *dip) 2697{ 2698 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2699 kstat_t *kstat; 2700 2701 /* 2702 * The locking order here is xdf_iostat_lk and then xdf_dev_lk. 2703 * xdf_dev_lk is used to protect the xdf_xdev_iostat pointer 2704 * and the contents of the our kstat. xdf_iostat_lk is used 2705 * to protect the allocation and freeing of the actual kstat. 2706 * xdf_dev_lk can't be used for this purpose because kstat 2707 * readers use it to access the contents of the kstat and 2708 * hence it can't be held when calling kstat_delete(). 2709 */ 2710 mutex_enter(&vdp->xdf_iostat_lk); 2711 mutex_enter(&vdp->xdf_dev_lk); 2712 2713 if (vdp->xdf_xdev_iostat == NULL) { 2714 mutex_exit(&vdp->xdf_dev_lk); 2715 mutex_exit(&vdp->xdf_iostat_lk); 2716 return; 2717 } 2718 2719 kstat = vdp->xdf_xdev_iostat; 2720 vdp->xdf_xdev_iostat = NULL; 2721 mutex_exit(&vdp->xdf_dev_lk); 2722 2723 kstat_delete(kstat); 2724 mutex_exit(&vdp->xdf_iostat_lk); 2725} 2726 2727int 2728xdf_kstat_create(dev_info_t *dip, char *ks_module, int ks_instance) 2729{ 2730 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2731 2732 /* See comment about locking in xdf_kstat_delete(). */ 2733 mutex_enter(&vdp->xdf_iostat_lk); 2734 mutex_enter(&vdp->xdf_dev_lk); 2735 2736 if (vdp->xdf_xdev_iostat != NULL) { 2737 mutex_exit(&vdp->xdf_dev_lk); 2738 mutex_exit(&vdp->xdf_iostat_lk); 2739 return (-1); 2740 } 2741 2742 if ((vdp->xdf_xdev_iostat = kstat_create( 2743 ks_module, ks_instance, NULL, "disk", 2744 KSTAT_TYPE_IO, 1, KSTAT_FLAG_PERSISTENT)) == NULL) { 2745 mutex_exit(&vdp->xdf_dev_lk); 2746 mutex_exit(&vdp->xdf_iostat_lk); 2747 return (-1); 2748 } 2749 2750 vdp->xdf_xdev_iostat->ks_lock = &vdp->xdf_dev_lk; 2751 kstat_install(vdp->xdf_xdev_iostat); 2752 mutex_exit(&vdp->xdf_dev_lk); 2753 mutex_exit(&vdp->xdf_iostat_lk); 2754 2755 return (0); 2756} 2757 2758#if defined(XPV_HVM_DRIVER) 2759 2760typedef struct xdf_hvm_entry { 2761 list_node_t xdf_he_list; 2762 char *xdf_he_path; 2763 dev_info_t *xdf_he_dip; 2764} xdf_hvm_entry_t; 2765 2766static list_t xdf_hvm_list; 2767static kmutex_t xdf_hvm_list_lock; 2768 2769static xdf_hvm_entry_t * 2770i_xdf_hvm_find(char *path, dev_info_t *dip) 2771{ 2772 xdf_hvm_entry_t *i; 2773 2774 ASSERT((path != NULL) || (dip != NULL)); 2775 ASSERT(MUTEX_HELD(&xdf_hvm_list_lock)); 2776 2777 i = list_head(&xdf_hvm_list); 2778 while (i != NULL) { 2779 if ((path != NULL) && strcmp(i->xdf_he_path, path) != 0) { 2780 i = list_next(&xdf_hvm_list, i); 2781 continue; 2782 } 2783 if ((dip != NULL) && (i->xdf_he_dip != dip)) { 2784 i = list_next(&xdf_hvm_list, i); 2785 continue; 2786 } 2787 break; 2788 } 2789 return (i); 2790} 2791 2792dev_info_t * 2793xdf_hvm_hold(char *path) 2794{ 2795 xdf_hvm_entry_t *i; 2796 dev_info_t *dip; 2797 2798 mutex_enter(&xdf_hvm_list_lock); 2799 i = i_xdf_hvm_find(path, NULL); 2800 if (i == NULL) { 2801 mutex_exit(&xdf_hvm_list_lock); 2802 return (B_FALSE); 2803 } 2804 ndi_hold_devi(dip = i->xdf_he_dip); 2805 mutex_exit(&xdf_hvm_list_lock); 2806 return (dip); 2807} 2808 2809static void 2810xdf_hvm_add(dev_info_t *dip) 2811{ 2812 xdf_hvm_entry_t *i; 2813 char *path; 2814 2815 /* figure out the path for the dip */ 2816 path = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 2817 (void) ddi_pathname(dip, path); 2818 2819 i = kmem_alloc(sizeof (*i), KM_SLEEP); 2820 i->xdf_he_dip = dip; 2821 i->xdf_he_path = i_ddi_strdup(path, KM_SLEEP); 2822 2823 mutex_enter(&xdf_hvm_list_lock); 2824 ASSERT(i_xdf_hvm_find(path, NULL) == NULL); 2825 ASSERT(i_xdf_hvm_find(NULL, dip) == NULL); 2826 list_insert_head(&xdf_hvm_list, i); 2827 mutex_exit(&xdf_hvm_list_lock); 2828 2829 kmem_free(path, MAXPATHLEN); 2830} 2831 2832static void 2833xdf_hvm_rm(dev_info_t *dip) 2834{ 2835 xdf_hvm_entry_t *i; 2836 2837 mutex_enter(&xdf_hvm_list_lock); 2838 VERIFY((i = i_xdf_hvm_find(NULL, dip)) != NULL); 2839 list_remove(&xdf_hvm_list, i); 2840 mutex_exit(&xdf_hvm_list_lock); 2841 2842 kmem_free(i->xdf_he_path, strlen(i->xdf_he_path) + 1); 2843 kmem_free(i, sizeof (*i)); 2844} 2845 2846static void 2847xdf_hvm_init(void) 2848{ 2849 list_create(&xdf_hvm_list, sizeof (xdf_hvm_entry_t), 2850 offsetof(xdf_hvm_entry_t, xdf_he_list)); 2851 mutex_init(&xdf_hvm_list_lock, NULL, MUTEX_DEFAULT, NULL); 2852} 2853 2854static void 2855xdf_hvm_fini(void) 2856{ 2857 ASSERT(list_head(&xdf_hvm_list) == NULL); 2858 list_destroy(&xdf_hvm_list); 2859 mutex_destroy(&xdf_hvm_list_lock); 2860} 2861 2862int 2863xdf_hvm_connect(dev_info_t *dip) 2864{ 2865 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2866 int rv; 2867 2868 /* do cv_wait until connected or failed */ 2869 mutex_enter(&vdp->xdf_dev_lk); 2870 rv = xdf_connect(vdp, B_TRUE); 2871 mutex_exit(&vdp->xdf_dev_lk); 2872 return ((rv == XD_READY) ? 0 : -1); 2873} 2874 2875int 2876xdf_hvm_setpgeom(dev_info_t *dip, cmlb_geom_t *geomp) 2877{ 2878 xdf_t *vdp = (xdf_t *)ddi_get_driver_private(dip); 2879 2880 /* sanity check the requested physical geometry */ 2881 mutex_enter(&vdp->xdf_dev_lk); 2882 if ((geomp->g_secsize != XB_BSIZE) || 2883 (geomp->g_capacity == 0)) { 2884 mutex_exit(&vdp->xdf_dev_lk); 2885 return (EINVAL); 2886 } 2887 2888 /* 2889 * If we've already connected to the backend device then make sure 2890 * we're not defining a physical geometry larger than our backend 2891 * device. 2892 */ 2893 if ((vdp->xdf_xdev_nblocks != 0) && 2894 (geomp->g_capacity > vdp->xdf_xdev_nblocks)) { 2895 mutex_exit(&vdp->xdf_dev_lk); 2896 return (EINVAL); 2897 } 2898 2899 vdp->xdf_pgeom = *geomp; 2900 mutex_exit(&vdp->xdf_dev_lk); 2901 2902 /* force a re-validation */ 2903 cmlb_invalidate(vdp->xdf_vd_lbl, NULL); 2904 2905 return (0); 2906} 2907 2908#endif /* XPV_HVM_DRIVER */ 2909