1 /* $OpenBSD: xen.c,v 1.95 2020/02/13 15:39:02 mikeb Exp $ */ 2 3 /* 4 * Copyright (c) 2015, 2016, 2017 Mike Belopuhov 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/param.h> 20 21 /* Xen requires locked atomic operations */ 22 #ifndef MULTIPROCESSOR 23 #define _XENMPATOMICS 24 #define MULTIPROCESSOR 25 #endif 26 #include <sys/atomic.h> 27 #ifdef _XENMPATOMICS 28 #undef MULTIPROCESSOR 29 #undef _XENMPATOMICS 30 #endif 31 32 #include <sys/systm.h> 33 #include <sys/proc.h> 34 #include <sys/signal.h> 35 #include <sys/signalvar.h> 36 #include <sys/refcnt.h> 37 #include <sys/malloc.h> 38 #include <sys/kernel.h> 39 #include <sys/stdint.h> 40 #include <sys/device.h> 41 #include <sys/task.h> 42 #include <sys/syslog.h> 43 44 #include <machine/bus.h> 45 #include <machine/cpu.h> 46 #include <machine/cpufunc.h> 47 48 #include <uvm/uvm_extern.h> 49 50 #include <machine/i82489var.h> 51 52 #include <dev/rndvar.h> 53 54 #include <dev/pv/pvvar.h> 55 #include <dev/pv/pvreg.h> 56 #include <dev/pv/xenreg.h> 57 #include <dev/pv/xenvar.h> 58 59 /* #define XEN_DEBUG */ 60 61 #ifdef XEN_DEBUG 62 #define DPRINTF(x...) printf(x) 63 #else 64 #define DPRINTF(x...) 65 #endif 66 67 struct xen_softc *xen_sc; 68 69 int xen_init_hypercall(struct xen_softc *); 70 int xen_getfeatures(struct xen_softc *); 71 int xen_init_info_page(struct xen_softc *); 72 int xen_init_cbvec(struct xen_softc *); 73 int xen_init_interrupts(struct xen_softc *); 74 void xen_intr_dispatch(void *); 75 int xen_init_grant_tables(struct xen_softc *); 76 struct xen_gntent * 77 xen_grant_table_grow(struct xen_softc *); 78 int xen_grant_table_alloc(struct xen_softc *, grant_ref_t *); 79 void xen_grant_table_free(struct xen_softc *, grant_ref_t); 80 void xen_grant_table_enter(struct xen_softc *, grant_ref_t, paddr_t, 81 int, int); 82 void xen_grant_table_remove(struct xen_softc *, grant_ref_t); 83 void xen_disable_emulated_devices(struct xen_softc *); 84 85 int xen_match(struct device *, void *, void *); 86 void xen_attach(struct device *, struct device *, void *); 87 void xen_deferred(struct device *); 88 void xen_control(void *); 89 void xen_hotplug(void *); 90 void xen_resume(struct device *); 91 int xen_activate(struct device *, int); 92 int xen_attach_device(struct xen_softc *, struct xen_devlist *, 93 const char *, const char *); 94 int xen_probe_devices(struct xen_softc *); 95 96 int xen_bus_dmamap_create(bus_dma_tag_t, bus_size_t, int, bus_size_t, 97 bus_size_t, int, bus_dmamap_t *); 98 void xen_bus_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t); 99 int xen_bus_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t, 100 struct proc *, int); 101 int xen_bus_dmamap_load_mbuf(bus_dma_tag_t, bus_dmamap_t, struct mbuf *, 102 int); 103 void xen_bus_dmamap_unload(bus_dma_tag_t, bus_dmamap_t); 104 void xen_bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_addr_t, 105 bus_size_t, int); 106 107 int xs_attach(struct xen_softc *); 108 109 struct cfdriver xen_cd = { 110 NULL, "xen", DV_DULL 111 }; 112 113 const struct cfattach xen_ca = { 114 sizeof(struct xen_softc), xen_match, xen_attach, NULL, xen_activate 115 }; 116 117 struct bus_dma_tag xen_bus_dma_tag = { 118 NULL, 119 xen_bus_dmamap_create, 120 xen_bus_dmamap_destroy, 121 xen_bus_dmamap_load, 122 xen_bus_dmamap_load_mbuf, 123 NULL, 124 NULL, 125 xen_bus_dmamap_unload, 126 xen_bus_dmamap_sync, 127 _bus_dmamem_alloc, 128 NULL, 129 _bus_dmamem_free, 130 _bus_dmamem_map, 131 _bus_dmamem_unmap, 132 NULL, 133 }; 134 135 int 136 xen_match(struct device *parent, void *match, void *aux) 137 { 138 struct pv_attach_args *pva = aux; 139 struct pvbus_hv *hv = &pva->pva_hv[PVBUS_XEN]; 140 141 if (hv->hv_base == 0) 142 return (0); 143 144 return (1); 145 } 146 147 void 148 xen_attach(struct device *parent, struct device *self, void *aux) 149 { 150 struct pv_attach_args *pva = (struct pv_attach_args *)aux; 151 struct pvbus_hv *hv = &pva->pva_hv[PVBUS_XEN]; 152 struct xen_softc *sc = (struct xen_softc *)self; 153 154 sc->sc_base = hv->hv_base; 155 sc->sc_dmat = pva->pva_dmat; 156 157 if (xen_init_hypercall(sc)) 158 return; 159 160 /* Wire it up to the global */ 161 xen_sc = sc; 162 163 if (xen_getfeatures(sc)) 164 return; 165 166 if (xen_init_info_page(sc)) 167 return; 168 169 xen_init_cbvec(sc); 170 171 if (xen_init_interrupts(sc)) 172 return; 173 174 if (xen_init_grant_tables(sc)) 175 return; 176 177 if (xs_attach(sc)) 178 return; 179 180 xen_probe_devices(sc); 181 182 /* pvbus(4) key/value interface */ 183 hv->hv_kvop = xs_kvop; 184 hv->hv_arg = sc; 185 186 xen_disable_emulated_devices(sc); 187 188 config_mountroot(self, xen_deferred); 189 } 190 191 void 192 xen_deferred(struct device *self) 193 { 194 struct xen_softc *sc = (struct xen_softc *)self; 195 196 if (!(sc->sc_flags & XSF_CBVEC)) { 197 DPRINTF("%s: callback vector hasn't been established\n", 198 sc->sc_dev.dv_xname); 199 return; 200 } 201 202 xen_intr_enable(); 203 204 if (xs_watch(sc, "control", "shutdown", &sc->sc_ctltsk, 205 xen_control, sc)) 206 printf("%s: failed to setup shutdown control watch\n", 207 sc->sc_dev.dv_xname); 208 } 209 210 void 211 xen_control(void *arg) 212 { 213 struct xen_softc *sc = arg; 214 struct xs_transaction xst; 215 char action[128]; 216 int error; 217 218 memset(&xst, 0, sizeof(xst)); 219 xst.xst_id = 0; 220 xst.xst_cookie = sc->sc_xs; 221 222 error = xs_getprop(sc, "control", "shutdown", action, sizeof(action)); 223 if (error) { 224 if (error != ENOENT) 225 printf("%s: failed to process control event\n", 226 sc->sc_dev.dv_xname); 227 return; 228 } 229 230 if (strlen(action) == 0) 231 return; 232 233 /* Acknowledge the event */ 234 xs_setprop(sc, "control", "shutdown", "", 0); 235 236 if (strcmp(action, "halt") == 0 || strcmp(action, "poweroff") == 0) { 237 pvbus_shutdown(&sc->sc_dev); 238 } else if (strcmp(action, "reboot") == 0) { 239 pvbus_reboot(&sc->sc_dev); 240 } else if (strcmp(action, "crash") == 0) { 241 panic("xen told us to do this"); 242 } else if (strcmp(action, "suspend") == 0) { 243 /* Not implemented yet */ 244 } else { 245 printf("%s: unknown shutdown event \"%s\"\n", 246 sc->sc_dev.dv_xname, action); 247 } 248 } 249 250 void 251 xen_resume(struct device *self) 252 { 253 } 254 255 int 256 xen_activate(struct device *self, int act) 257 { 258 int rv = 0; 259 260 switch (act) { 261 case DVACT_RESUME: 262 xen_resume(self); 263 break; 264 } 265 return (rv); 266 } 267 268 int 269 xen_init_hypercall(struct xen_softc *sc) 270 { 271 extern void *xen_hypercall_page; 272 uint32_t regs[4]; 273 paddr_t pa; 274 275 /* Get hypercall page configuration MSR */ 276 CPUID(sc->sc_base + CPUID_OFFSET_XEN_HYPERCALL, 277 regs[0], regs[1], regs[2], regs[3]); 278 279 /* We don't support more than one hypercall page */ 280 if (regs[0] != 1) { 281 printf(": requested %u hypercall pages\n", regs[0]); 282 return (-1); 283 } 284 285 sc->sc_hc = &xen_hypercall_page; 286 287 if (!pmap_extract(pmap_kernel(), (vaddr_t)sc->sc_hc, &pa)) { 288 printf(": hypercall page PA extraction failed\n"); 289 return (-1); 290 } 291 wrmsr(regs[1], pa); 292 293 return (0); 294 } 295 296 int 297 xen_hypercall(struct xen_softc *sc, int op, int argc, ...) 298 { 299 va_list ap; 300 ulong argv[5]; 301 int i; 302 303 if (argc < 0 || argc > 5) 304 return (-1); 305 va_start(ap, argc); 306 for (i = 0; i < argc; i++) 307 argv[i] = (ulong)va_arg(ap, ulong); 308 va_end(ap); 309 return (xen_hypercallv(sc, op, argc, argv)); 310 } 311 312 int 313 xen_hypercallv(struct xen_softc *sc, int op, int argc, ulong *argv) 314 { 315 ulong hcall; 316 int rv = 0; 317 318 hcall = (ulong)sc->sc_hc + op * 32; 319 320 #if defined(XEN_DEBUG) && disabled 321 { 322 int i; 323 324 printf("hypercall %d", op); 325 if (argc > 0) { 326 printf(", args {"); 327 for (i = 0; i < argc; i++) 328 printf(" %#lx", argv[i]); 329 printf(" }\n"); 330 } else 331 printf("\n"); 332 } 333 #endif 334 335 switch (argc) { 336 case 0: { 337 HYPERCALL_RES1; 338 __asm__ volatile ( \ 339 HYPERCALL_LABEL \ 340 : HYPERCALL_OUT1 \ 341 : HYPERCALL_PTR(hcall) \ 342 : HYPERCALL_CLOBBER \ 343 ); 344 HYPERCALL_RET(rv); 345 break; 346 } 347 case 1: { 348 HYPERCALL_RES1; HYPERCALL_RES2; 349 HYPERCALL_ARG1(argv[0]); 350 __asm__ volatile ( \ 351 HYPERCALL_LABEL \ 352 : HYPERCALL_OUT1 HYPERCALL_OUT2 \ 353 : HYPERCALL_IN1 \ 354 , HYPERCALL_PTR(hcall) \ 355 : HYPERCALL_CLOBBER \ 356 ); 357 HYPERCALL_RET(rv); 358 break; 359 } 360 case 2: { 361 HYPERCALL_RES1; HYPERCALL_RES2; HYPERCALL_RES3; 362 HYPERCALL_ARG1(argv[0]); HYPERCALL_ARG2(argv[1]); 363 __asm__ volatile ( \ 364 HYPERCALL_LABEL \ 365 : HYPERCALL_OUT1 HYPERCALL_OUT2 \ 366 HYPERCALL_OUT3 \ 367 : HYPERCALL_IN1 HYPERCALL_IN2 \ 368 , HYPERCALL_PTR(hcall) \ 369 : HYPERCALL_CLOBBER \ 370 ); 371 HYPERCALL_RET(rv); 372 break; 373 } 374 case 3: { 375 HYPERCALL_RES1; HYPERCALL_RES2; HYPERCALL_RES3; 376 HYPERCALL_RES4; 377 HYPERCALL_ARG1(argv[0]); HYPERCALL_ARG2(argv[1]); 378 HYPERCALL_ARG3(argv[2]); 379 __asm__ volatile ( \ 380 HYPERCALL_LABEL \ 381 : HYPERCALL_OUT1 HYPERCALL_OUT2 \ 382 HYPERCALL_OUT3 HYPERCALL_OUT4 \ 383 : HYPERCALL_IN1 HYPERCALL_IN2 \ 384 HYPERCALL_IN3 \ 385 , HYPERCALL_PTR(hcall) \ 386 : HYPERCALL_CLOBBER \ 387 ); 388 HYPERCALL_RET(rv); 389 break; 390 } 391 case 4: { 392 HYPERCALL_RES1; HYPERCALL_RES2; HYPERCALL_RES3; 393 HYPERCALL_RES4; HYPERCALL_RES5; 394 HYPERCALL_ARG1(argv[0]); HYPERCALL_ARG2(argv[1]); 395 HYPERCALL_ARG3(argv[2]); HYPERCALL_ARG4(argv[3]); 396 __asm__ volatile ( \ 397 HYPERCALL_LABEL \ 398 : HYPERCALL_OUT1 HYPERCALL_OUT2 \ 399 HYPERCALL_OUT3 HYPERCALL_OUT4 \ 400 HYPERCALL_OUT5 \ 401 : HYPERCALL_IN1 HYPERCALL_IN2 \ 402 HYPERCALL_IN3 HYPERCALL_IN4 \ 403 , HYPERCALL_PTR(hcall) \ 404 : HYPERCALL_CLOBBER \ 405 ); 406 HYPERCALL_RET(rv); 407 break; 408 } 409 case 5: { 410 HYPERCALL_RES1; HYPERCALL_RES2; HYPERCALL_RES3; 411 HYPERCALL_RES4; HYPERCALL_RES5; HYPERCALL_RES6; 412 HYPERCALL_ARG1(argv[0]); HYPERCALL_ARG2(argv[1]); 413 HYPERCALL_ARG3(argv[2]); HYPERCALL_ARG4(argv[3]); 414 HYPERCALL_ARG5(argv[4]); 415 __asm__ volatile ( \ 416 HYPERCALL_LABEL \ 417 : HYPERCALL_OUT1 HYPERCALL_OUT2 \ 418 HYPERCALL_OUT3 HYPERCALL_OUT4 \ 419 HYPERCALL_OUT5 HYPERCALL_OUT6 \ 420 : HYPERCALL_IN1 HYPERCALL_IN2 \ 421 HYPERCALL_IN3 HYPERCALL_IN4 \ 422 HYPERCALL_IN5 \ 423 , HYPERCALL_PTR(hcall) \ 424 : HYPERCALL_CLOBBER \ 425 ); 426 HYPERCALL_RET(rv); 427 break; 428 } 429 default: 430 DPRINTF("%s: wrong number of arguments: %d\n", __func__, argc); 431 rv = -1; 432 break; 433 } 434 return (rv); 435 } 436 437 int 438 xen_getfeatures(struct xen_softc *sc) 439 { 440 struct xen_feature_info xfi; 441 442 memset(&xfi, 0, sizeof(xfi)); 443 if (xen_hypercall(sc, XC_VERSION, 2, XENVER_get_features, &xfi) < 0) { 444 printf(": failed to fetch features\n"); 445 return (-1); 446 } 447 sc->sc_features = xfi.submap; 448 #ifdef XEN_DEBUG 449 printf(": features %b", sc->sc_features, 450 "\20\014DOM0\013PIRQ\012PVCLOCK\011CBVEC\010GNTFLAGS\007HMA" 451 "\006PTUPD\005PAE4G\004SUPERVISOR\003AUTOPMAP\002WDT\001WPT"); 452 #else 453 printf(": features %#x", sc->sc_features); 454 #endif 455 return (0); 456 } 457 458 #ifdef XEN_DEBUG 459 void 460 xen_print_info_page(void) 461 { 462 struct xen_softc *sc = xen_sc; 463 struct shared_info *s = sc->sc_ipg; 464 struct vcpu_info *v; 465 int i; 466 467 virtio_membar_sync(); 468 for (i = 0; i < XEN_LEGACY_MAX_VCPUS; i++) { 469 v = &s->vcpu_info[i]; 470 if (!v->evtchn_upcall_pending && !v->evtchn_upcall_mask && 471 !v->evtchn_pending_sel && !v->time.version && 472 !v->time.tsc_timestamp && !v->time.system_time && 473 !v->time.tsc_to_system_mul && !v->time.tsc_shift) 474 continue; 475 printf("vcpu%d:\n" 476 " upcall_pending=%02x upcall_mask=%02x pending_sel=%#lx\n" 477 " time version=%u tsc=%llu system=%llu\n" 478 " time mul=%u shift=%d\n", 479 i, v->evtchn_upcall_pending, v->evtchn_upcall_mask, 480 v->evtchn_pending_sel, v->time.version, 481 v->time.tsc_timestamp, v->time.system_time, 482 v->time.tsc_to_system_mul, v->time.tsc_shift); 483 } 484 printf("pending events: "); 485 for (i = 0; i < nitems(s->evtchn_pending); i++) { 486 if (s->evtchn_pending[i] == 0) 487 continue; 488 printf(" %d:%#lx", i, s->evtchn_pending[i]); 489 } 490 printf("\nmasked events: "); 491 for (i = 0; i < nitems(s->evtchn_mask); i++) { 492 if (s->evtchn_mask[i] == 0xffffffffffffffffULL) 493 continue; 494 printf(" %d:%#lx", i, s->evtchn_mask[i]); 495 } 496 printf("\nwc ver=%u sec=%u nsec=%u\n", s->wc_version, s->wc_sec, 497 s->wc_nsec); 498 printf("arch maxpfn=%lu framelist=%lu nmi=%lu\n", s->arch.max_pfn, 499 s->arch.pfn_to_mfn_frame_list, s->arch.nmi_reason); 500 } 501 #endif /* XEN_DEBUG */ 502 503 int 504 xen_init_info_page(struct xen_softc *sc) 505 { 506 struct xen_add_to_physmap xatp; 507 paddr_t pa; 508 509 sc->sc_ipg = malloc(PAGE_SIZE, M_DEVBUF, M_NOWAIT | M_ZERO); 510 if (sc->sc_ipg == NULL) { 511 printf(": failed to allocate shared info page\n"); 512 return (-1); 513 } 514 if (!pmap_extract(pmap_kernel(), (vaddr_t)sc->sc_ipg, &pa)) { 515 printf(": shared info page PA extraction failed\n"); 516 free(sc->sc_ipg, M_DEVBUF, PAGE_SIZE); 517 return (-1); 518 } 519 xatp.domid = DOMID_SELF; 520 xatp.idx = 0; 521 xatp.space = XENMAPSPACE_shared_info; 522 xatp.gpfn = atop(pa); 523 if (xen_hypercall(sc, XC_MEMORY, 2, XENMEM_add_to_physmap, &xatp)) { 524 printf(": failed to register shared info page\n"); 525 free(sc->sc_ipg, M_DEVBUF, PAGE_SIZE); 526 return (-1); 527 } 528 return (0); 529 } 530 531 int 532 xen_init_cbvec(struct xen_softc *sc) 533 { 534 struct xen_hvm_param xhp; 535 536 if ((sc->sc_features & XENFEAT_CBVEC) == 0) 537 return (ENOENT); 538 539 xhp.domid = DOMID_SELF; 540 xhp.index = HVM_PARAM_CALLBACK_IRQ; 541 xhp.value = HVM_CALLBACK_VECTOR(LAPIC_XEN_VECTOR); 542 if (xen_hypercall(sc, XC_HVM, 2, HVMOP_set_param, &xhp)) { 543 /* Will retry with the xspd(4) PCI interrupt */ 544 return (ENOENT); 545 } 546 DPRINTF(", idtvec %d", LAPIC_XEN_VECTOR); 547 548 sc->sc_flags |= XSF_CBVEC; 549 550 return (0); 551 } 552 553 int 554 xen_init_interrupts(struct xen_softc *sc) 555 { 556 int i; 557 558 sc->sc_irq = LAPIC_XEN_VECTOR; 559 560 /* 561 * Clear all pending events and mask all interrupts 562 */ 563 for (i = 0; i < nitems(sc->sc_ipg->evtchn_pending); i++) { 564 sc->sc_ipg->evtchn_pending[i] = 0; 565 sc->sc_ipg->evtchn_mask[i] = ~0UL; 566 } 567 568 SLIST_INIT(&sc->sc_intrs); 569 570 mtx_init(&sc->sc_islck, IPL_NET); 571 572 return (0); 573 } 574 575 static int 576 xen_evtchn_hypercall(struct xen_softc *sc, int cmd, void *arg, size_t len) 577 { 578 struct evtchn_op compat; 579 int error; 580 581 error = xen_hypercall(sc, XC_EVTCHN, 2, cmd, arg); 582 if (error == -ENOXENSYS) { 583 memset(&compat, 0, sizeof(compat)); 584 compat.cmd = cmd; 585 memcpy(&compat.u, arg, len); 586 error = xen_hypercall(sc, XC_OEVTCHN, 1, &compat); 587 } 588 return (error); 589 } 590 591 static inline void 592 xen_intsrc_add(struct xen_softc *sc, struct xen_intsrc *xi) 593 { 594 refcnt_init(&xi->xi_refcnt); 595 mtx_enter(&sc->sc_islck); 596 SLIST_INSERT_HEAD(&sc->sc_intrs, xi, xi_entry); 597 mtx_leave(&sc->sc_islck); 598 } 599 600 static inline struct xen_intsrc * 601 xen_intsrc_acquire(struct xen_softc *sc, evtchn_port_t port) 602 { 603 struct xen_intsrc *xi = NULL; 604 605 mtx_enter(&sc->sc_islck); 606 SLIST_FOREACH(xi, &sc->sc_intrs, xi_entry) { 607 if (xi->xi_port == port) { 608 refcnt_take(&xi->xi_refcnt); 609 break; 610 } 611 } 612 mtx_leave(&sc->sc_islck); 613 return (xi); 614 } 615 616 static inline void 617 xen_intsrc_release(struct xen_softc *sc, struct xen_intsrc *xi) 618 { 619 refcnt_rele_wake(&xi->xi_refcnt); 620 } 621 622 static inline struct xen_intsrc * 623 xen_intsrc_remove(struct xen_softc *sc, evtchn_port_t port) 624 { 625 struct xen_intsrc *xi; 626 627 mtx_enter(&sc->sc_islck); 628 SLIST_FOREACH(xi, &sc->sc_intrs, xi_entry) { 629 if (xi->xi_port == port) { 630 SLIST_REMOVE(&sc->sc_intrs, xi, xen_intsrc, xi_entry); 631 break; 632 } 633 } 634 mtx_leave(&sc->sc_islck); 635 if (xi != NULL) 636 refcnt_finalize(&xi->xi_refcnt, "xenisrm"); 637 return (xi); 638 } 639 640 static inline void 641 xen_intr_mask_acquired(struct xen_softc *sc, struct xen_intsrc *xi) 642 { 643 xi->xi_masked = 1; 644 set_bit(xi->xi_port, &sc->sc_ipg->evtchn_mask[0]); 645 } 646 647 static inline int 648 xen_intr_unmask_release(struct xen_softc *sc, struct xen_intsrc *xi) 649 { 650 struct evtchn_unmask eu; 651 652 xi->xi_masked = 0; 653 if (!test_bit(xi->xi_port, &sc->sc_ipg->evtchn_mask[0])) { 654 xen_intsrc_release(sc, xi); 655 return (0); 656 } 657 eu.port = xi->xi_port; 658 xen_intsrc_release(sc, xi); 659 return (xen_evtchn_hypercall(sc, EVTCHNOP_unmask, &eu, sizeof(eu))); 660 } 661 662 void 663 xen_intr_ack(void) 664 { 665 struct xen_softc *sc = xen_sc; 666 struct shared_info *s = sc->sc_ipg; 667 struct cpu_info *ci = curcpu(); 668 struct vcpu_info *v = &s->vcpu_info[CPU_INFO_UNIT(ci)]; 669 670 v->evtchn_upcall_pending = 0; 671 virtio_membar_sync(); 672 } 673 674 void 675 xen_intr(void) 676 { 677 struct xen_softc *sc = xen_sc; 678 struct xen_intsrc *xi; 679 struct shared_info *s = sc->sc_ipg; 680 struct cpu_info *ci = curcpu(); 681 struct vcpu_info *v = &s->vcpu_info[CPU_INFO_UNIT(ci)]; 682 ulong pending, selector; 683 int port, bit, row; 684 685 v->evtchn_upcall_pending = 0; 686 selector = atomic_swap_ulong(&v->evtchn_pending_sel, 0); 687 688 for (row = 0; selector > 0; selector >>= 1, row++) { 689 if ((selector & 1) == 0) 690 continue; 691 if ((sc->sc_ipg->evtchn_pending[row] & 692 ~(sc->sc_ipg->evtchn_mask[row])) == 0) 693 continue; 694 pending = atomic_swap_ulong(&sc->sc_ipg->evtchn_pending[row], 695 0) & ~(sc->sc_ipg->evtchn_mask[row]); 696 for (bit = 0; pending > 0; pending >>= 1, bit++) { 697 if ((pending & 1) == 0) 698 continue; 699 port = (row * LONG_BIT) + bit; 700 if ((xi = xen_intsrc_acquire(sc, port)) == NULL) { 701 printf("%s: unhandled interrupt on port %d\n", 702 sc->sc_dev.dv_xname, port); 703 continue; 704 } 705 xi->xi_evcnt.ec_count++; 706 xen_intr_mask_acquired(sc, xi); 707 if (!task_add(xi->xi_taskq, &xi->xi_task)) 708 xen_intsrc_release(sc, xi); 709 } 710 } 711 } 712 713 void 714 xen_intr_schedule(xen_intr_handle_t xih) 715 { 716 struct xen_softc *sc = xen_sc; 717 struct xen_intsrc *xi; 718 719 if ((xi = xen_intsrc_acquire(sc, (evtchn_port_t)xih)) != NULL) { 720 xen_intr_mask_acquired(sc, xi); 721 if (!task_add(xi->xi_taskq, &xi->xi_task)) 722 xen_intsrc_release(sc, xi); 723 } 724 } 725 726 /* 727 * This code achieves two goals: 1) makes sure that *after* masking 728 * the interrupt source we're not getting more task_adds: intr_barrier 729 * will take care of that, and 2) makes sure that the interrupt task 730 * has finished executing the current task and won't be called again: 731 * it sets up a barrier task to await completion of the current task 732 * and relies on the interrupt masking to prevent submission of new 733 * tasks in the future. 734 */ 735 void 736 xen_intr_barrier(xen_intr_handle_t xih) 737 { 738 struct xen_softc *sc = xen_sc; 739 struct xen_intsrc *xi; 740 741 /* 742 * XXX This will need to be revised once intr_barrier starts 743 * using its argument. 744 */ 745 intr_barrier(NULL); 746 747 if ((xi = xen_intsrc_acquire(sc, (evtchn_port_t)xih)) != NULL) { 748 taskq_barrier(xi->xi_taskq); 749 xen_intsrc_release(sc, xi); 750 } 751 } 752 753 void 754 xen_intr_signal(xen_intr_handle_t xih) 755 { 756 struct xen_softc *sc = xen_sc; 757 struct xen_intsrc *xi; 758 struct evtchn_send es; 759 760 if ((xi = xen_intsrc_acquire(sc, (evtchn_port_t)xih)) != NULL) { 761 es.port = xi->xi_port; 762 xen_intsrc_release(sc, xi); 763 xen_evtchn_hypercall(sc, EVTCHNOP_send, &es, sizeof(es)); 764 } 765 } 766 767 int 768 xen_intr_establish(evtchn_port_t port, xen_intr_handle_t *xih, int domain, 769 void (*handler)(void *), void *arg, char *name) 770 { 771 struct xen_softc *sc = xen_sc; 772 struct xen_intsrc *xi; 773 struct evtchn_alloc_unbound eau; 774 #ifdef notyet 775 struct evtchn_bind_vcpu ebv; 776 #endif 777 #if defined(XEN_DEBUG) && disabled 778 struct evtchn_status es; 779 #endif 780 781 if (port && (xi = xen_intsrc_acquire(sc, port)) != NULL) { 782 xen_intsrc_release(sc, xi); 783 DPRINTF("%s: interrupt handler has already been established " 784 "for port %u\n", sc->sc_dev.dv_xname, port); 785 return (-1); 786 } 787 788 xi = malloc(sizeof(*xi), M_DEVBUF, M_NOWAIT | M_ZERO); 789 if (xi == NULL) 790 return (-1); 791 792 xi->xi_port = (evtchn_port_t)*xih; 793 794 xi->xi_handler = handler; 795 xi->xi_ctx = arg; 796 797 xi->xi_taskq = taskq_create(name, 1, IPL_NET, TASKQ_MPSAFE); 798 if (!xi->xi_taskq) { 799 printf("%s: failed to create interrupt task for %s\n", 800 sc->sc_dev.dv_xname, name); 801 free(xi, M_DEVBUF, sizeof(*xi)); 802 return (-1); 803 } 804 task_set(&xi->xi_task, xen_intr_dispatch, xi); 805 806 if (port == 0) { 807 /* We're being asked to allocate a new event port */ 808 memset(&eau, 0, sizeof(eau)); 809 eau.dom = DOMID_SELF; 810 eau.remote_dom = domain; 811 if (xen_evtchn_hypercall(sc, EVTCHNOP_alloc_unbound, &eau, 812 sizeof(eau)) != 0) { 813 DPRINTF("%s: failed to allocate new event port\n", 814 sc->sc_dev.dv_xname); 815 free(xi, M_DEVBUF, sizeof(*xi)); 816 return (-1); 817 } 818 *xih = xi->xi_port = eau.port; 819 } else { 820 *xih = xi->xi_port = port; 821 /* 822 * The Event Channel API didn't open this port, so it is not 823 * responsible for closing it automatically on unbind. 824 */ 825 xi->xi_noclose = 1; 826 } 827 828 #ifdef notyet 829 /* Bind interrupt to VCPU#0 */ 830 memset(&ebv, 0, sizeof(ebv)); 831 ebv.port = xi->xi_port; 832 ebv.vcpu = 0; 833 if (xen_evtchn_hypercall(sc, EVTCHNOP_bind_vcpu, &ebv, sizeof(ebv))) { 834 printf("%s: failed to bind interrupt on port %u to vcpu%d\n", 835 sc->sc_dev.dv_xname, ebv.port, ebv.vcpu); 836 } 837 #endif 838 839 evcount_attach(&xi->xi_evcnt, name, &sc->sc_irq); 840 841 xen_intsrc_add(sc, xi); 842 843 /* Mask the event port */ 844 set_bit(xi->xi_port, &sc->sc_ipg->evtchn_mask[0]); 845 846 #if defined(XEN_DEBUG) && disabled 847 memset(&es, 0, sizeof(es)); 848 es.dom = DOMID_SELF; 849 es.port = xi->xi_port; 850 if (xen_evtchn_hypercall(sc, EVTCHNOP_status, &es, sizeof(es))) { 851 printf("%s: failed to obtain status for port %d\n", 852 sc->sc_dev.dv_xname, es.port); 853 } 854 printf("%s: port %u bound to vcpu%u", sc->sc_dev.dv_xname, 855 es.port, es.vcpu); 856 if (es.status == EVTCHNSTAT_interdomain) 857 printf(": domain %d port %u\n", es.u.interdomain.dom, 858 es.u.interdomain.port); 859 else if (es.status == EVTCHNSTAT_unbound) 860 printf(": domain %d\n", es.u.unbound.dom); 861 else if (es.status == EVTCHNSTAT_pirq) 862 printf(": pirq %u\n", es.u.pirq); 863 else if (es.status == EVTCHNSTAT_virq) 864 printf(": virq %u\n", es.u.virq); 865 else 866 printf("\n"); 867 #endif 868 869 return (0); 870 } 871 872 int 873 xen_intr_disestablish(xen_intr_handle_t xih) 874 { 875 struct xen_softc *sc = xen_sc; 876 evtchn_port_t port = (evtchn_port_t)xih; 877 struct evtchn_close ec; 878 struct xen_intsrc *xi; 879 880 if ((xi = xen_intsrc_remove(sc, port)) == NULL) 881 return (-1); 882 883 evcount_detach(&xi->xi_evcnt); 884 885 taskq_destroy(xi->xi_taskq); 886 887 set_bit(xi->xi_port, &sc->sc_ipg->evtchn_mask[0]); 888 clear_bit(xi->xi_port, &sc->sc_ipg->evtchn_pending[0]); 889 890 if (!xi->xi_noclose) { 891 ec.port = xi->xi_port; 892 if (xen_evtchn_hypercall(sc, EVTCHNOP_close, &ec, sizeof(ec))) { 893 DPRINTF("%s: failed to close event port %u\n", 894 sc->sc_dev.dv_xname, xi->xi_port); 895 } 896 } 897 898 free(xi, M_DEVBUF, sizeof(*xi)); 899 return (0); 900 } 901 902 void 903 xen_intr_dispatch(void *arg) 904 { 905 struct xen_softc *sc = xen_sc; 906 struct xen_intsrc *xi = arg; 907 908 if (xi->xi_handler) 909 xi->xi_handler(xi->xi_ctx); 910 911 xen_intr_unmask_release(sc, xi); 912 } 913 914 void 915 xen_intr_enable(void) 916 { 917 struct xen_softc *sc = xen_sc; 918 struct xen_intsrc *xi; 919 struct evtchn_unmask eu; 920 921 mtx_enter(&sc->sc_islck); 922 SLIST_FOREACH(xi, &sc->sc_intrs, xi_entry) { 923 if (!xi->xi_masked) { 924 eu.port = xi->xi_port; 925 if (xen_evtchn_hypercall(sc, EVTCHNOP_unmask, &eu, 926 sizeof(eu))) 927 printf("%s: unmasking port %u failed\n", 928 sc->sc_dev.dv_xname, xi->xi_port); 929 virtio_membar_sync(); 930 if (test_bit(xi->xi_port, &sc->sc_ipg->evtchn_mask[0])) 931 printf("%s: port %u is still masked\n", 932 sc->sc_dev.dv_xname, xi->xi_port); 933 } 934 } 935 mtx_leave(&sc->sc_islck); 936 } 937 938 void 939 xen_intr_mask(xen_intr_handle_t xih) 940 { 941 struct xen_softc *sc = xen_sc; 942 evtchn_port_t port = (evtchn_port_t)xih; 943 struct xen_intsrc *xi; 944 945 if ((xi = xen_intsrc_acquire(sc, port)) != NULL) { 946 xen_intr_mask_acquired(sc, xi); 947 xen_intsrc_release(sc, xi); 948 } 949 } 950 951 int 952 xen_intr_unmask(xen_intr_handle_t xih) 953 { 954 struct xen_softc *sc = xen_sc; 955 evtchn_port_t port = (evtchn_port_t)xih; 956 struct xen_intsrc *xi; 957 958 if ((xi = xen_intsrc_acquire(sc, port)) != NULL) 959 return (xen_intr_unmask_release(sc, xi)); 960 961 return (0); 962 } 963 964 int 965 xen_init_grant_tables(struct xen_softc *sc) 966 { 967 struct gnttab_query_size gqs; 968 969 gqs.dom = DOMID_SELF; 970 if (xen_hypercall(sc, XC_GNTTAB, 3, GNTTABOP_query_size, &gqs, 1)) { 971 printf(": failed the query for grant table pages\n"); 972 return (-1); 973 } 974 if (gqs.nr_frames == 0 || gqs.nr_frames > gqs.max_nr_frames) { 975 printf(": invalid number of grant table pages: %u/%u\n", 976 gqs.nr_frames, gqs.max_nr_frames); 977 return (-1); 978 } 979 980 sc->sc_gntmax = gqs.max_nr_frames; 981 982 sc->sc_gnt = mallocarray(sc->sc_gntmax + 1, sizeof(struct xen_gntent), 983 M_DEVBUF, M_ZERO | M_NOWAIT); 984 if (sc->sc_gnt == NULL) { 985 printf(": failed to allocate grant table lookup table\n"); 986 return (-1); 987 } 988 989 mtx_init(&sc->sc_gntlck, IPL_NET); 990 991 if (xen_grant_table_grow(sc) == NULL) { 992 free(sc->sc_gnt, M_DEVBUF, sc->sc_gntmax * 993 sizeof(struct xen_gntent)); 994 return (-1); 995 } 996 997 printf(", %d grant table frames", sc->sc_gntmax); 998 999 xen_bus_dma_tag._cookie = sc; 1000 1001 return (0); 1002 } 1003 1004 struct xen_gntent * 1005 xen_grant_table_grow(struct xen_softc *sc) 1006 { 1007 struct xen_add_to_physmap xatp; 1008 struct xen_gntent *ge; 1009 void *va; 1010 paddr_t pa; 1011 1012 if (sc->sc_gntcnt == sc->sc_gntmax) { 1013 printf("%s: grant table frame allotment limit reached\n", 1014 sc->sc_dev.dv_xname); 1015 return (NULL); 1016 } 1017 1018 va = km_alloc(PAGE_SIZE, &kv_any, &kp_zero, &kd_nowait); 1019 if (va == NULL) 1020 return (NULL); 1021 if (!pmap_extract(pmap_kernel(), (vaddr_t)va, &pa)) { 1022 printf("%s: grant table page PA extraction failed\n", 1023 sc->sc_dev.dv_xname); 1024 km_free(va, PAGE_SIZE, &kv_any, &kp_zero); 1025 return (NULL); 1026 } 1027 1028 mtx_enter(&sc->sc_gntlck); 1029 1030 ge = &sc->sc_gnt[sc->sc_gntcnt]; 1031 ge->ge_table = va; 1032 1033 xatp.domid = DOMID_SELF; 1034 xatp.idx = sc->sc_gntcnt; 1035 xatp.space = XENMAPSPACE_grant_table; 1036 xatp.gpfn = atop(pa); 1037 if (xen_hypercall(sc, XC_MEMORY, 2, XENMEM_add_to_physmap, &xatp)) { 1038 printf("%s: failed to add a grant table page\n", 1039 sc->sc_dev.dv_xname); 1040 km_free(ge->ge_table, PAGE_SIZE, &kv_any, &kp_zero); 1041 mtx_leave(&sc->sc_gntlck); 1042 return (NULL); 1043 } 1044 ge->ge_start = sc->sc_gntcnt * GNTTAB_NEPG; 1045 /* First page has 8 reserved entries */ 1046 ge->ge_reserved = ge->ge_start == 0 ? GNTTAB_NR_RESERVED_ENTRIES : 0; 1047 ge->ge_free = GNTTAB_NEPG - ge->ge_reserved; 1048 ge->ge_next = ge->ge_reserved; 1049 mtx_init(&ge->ge_lock, IPL_NET); 1050 1051 sc->sc_gntcnt++; 1052 mtx_leave(&sc->sc_gntlck); 1053 1054 return (ge); 1055 } 1056 1057 int 1058 xen_grant_table_alloc(struct xen_softc *sc, grant_ref_t *ref) 1059 { 1060 struct xen_gntent *ge; 1061 int i; 1062 1063 /* Start with a previously allocated table page */ 1064 ge = &sc->sc_gnt[sc->sc_gntcnt - 1]; 1065 if (ge->ge_free > 0) { 1066 mtx_enter(&ge->ge_lock); 1067 if (ge->ge_free > 0) 1068 goto search; 1069 mtx_leave(&ge->ge_lock); 1070 } 1071 1072 /* Try other existing table pages */ 1073 for (i = 0; i < sc->sc_gntcnt; i++) { 1074 ge = &sc->sc_gnt[i]; 1075 if (ge->ge_free == 0) 1076 continue; 1077 mtx_enter(&ge->ge_lock); 1078 if (ge->ge_free > 0) 1079 goto search; 1080 mtx_leave(&ge->ge_lock); 1081 } 1082 1083 alloc: 1084 /* Allocate a new table page */ 1085 if ((ge = xen_grant_table_grow(sc)) == NULL) 1086 return (-1); 1087 1088 mtx_enter(&ge->ge_lock); 1089 if (ge->ge_free == 0) { 1090 /* We were not fast enough... */ 1091 mtx_leave(&ge->ge_lock); 1092 goto alloc; 1093 } 1094 1095 search: 1096 for (i = ge->ge_next; 1097 /* Math works here because GNTTAB_NEPG is a power of 2 */ 1098 i != ((ge->ge_next + GNTTAB_NEPG - 1) & (GNTTAB_NEPG - 1)); 1099 i++) { 1100 if (i == GNTTAB_NEPG) 1101 i = 0; 1102 if (ge->ge_reserved && i < ge->ge_reserved) 1103 continue; 1104 if (ge->ge_table[i].frame != 0) 1105 continue; 1106 *ref = ge->ge_start + i; 1107 ge->ge_table[i].flags = GTF_invalid; 1108 ge->ge_table[i].frame = 0xffffffff; /* Mark as taken */ 1109 if ((ge->ge_next = i + 1) == GNTTAB_NEPG) 1110 ge->ge_next = ge->ge_reserved; 1111 ge->ge_free--; 1112 mtx_leave(&ge->ge_lock); 1113 return (0); 1114 } 1115 mtx_leave(&ge->ge_lock); 1116 1117 panic("page full, sc %p gnt %p (%d) ge %p", sc, sc->sc_gnt, 1118 sc->sc_gntcnt, ge); 1119 return (-1); 1120 } 1121 1122 void 1123 xen_grant_table_free(struct xen_softc *sc, grant_ref_t ref) 1124 { 1125 struct xen_gntent *ge; 1126 1127 #ifdef XEN_DEBUG 1128 if (ref > sc->sc_gntcnt * GNTTAB_NEPG) 1129 panic("unmanaged ref %u sc %p gnt %p (%d)", ref, sc, 1130 sc->sc_gnt, sc->sc_gntcnt); 1131 #endif 1132 ge = &sc->sc_gnt[ref / GNTTAB_NEPG]; 1133 mtx_enter(&ge->ge_lock); 1134 #ifdef XEN_DEBUG 1135 if (ref < ge->ge_start || ref > ge->ge_start + GNTTAB_NEPG) { 1136 mtx_leave(&ge->ge_lock); 1137 panic("out of bounds ref %u ge %p start %u sc %p gnt %p", 1138 ref, ge, ge->ge_start, sc, sc->sc_gnt); 1139 } 1140 #endif 1141 ref -= ge->ge_start; 1142 if (ge->ge_table[ref].flags != GTF_invalid) { 1143 mtx_leave(&ge->ge_lock); 1144 panic("reference %u is still in use, flags %#x frame %#x", 1145 ref + ge->ge_start, ge->ge_table[ref].flags, 1146 ge->ge_table[ref].frame); 1147 } 1148 ge->ge_table[ref].frame = 0; 1149 ge->ge_next = ref; 1150 ge->ge_free++; 1151 mtx_leave(&ge->ge_lock); 1152 } 1153 1154 void 1155 xen_grant_table_enter(struct xen_softc *sc, grant_ref_t ref, paddr_t pa, 1156 int domain, int flags) 1157 { 1158 struct xen_gntent *ge; 1159 1160 #ifdef XEN_DEBUG 1161 if (ref > sc->sc_gntcnt * GNTTAB_NEPG) 1162 panic("unmanaged ref %u sc %p gnt %p (%d)", ref, sc, 1163 sc->sc_gnt, sc->sc_gntcnt); 1164 #endif 1165 ge = &sc->sc_gnt[ref / GNTTAB_NEPG]; 1166 #ifdef XEN_DEBUG 1167 if (ref < ge->ge_start || ref > ge->ge_start + GNTTAB_NEPG) { 1168 panic("out of bounds ref %u ge %p start %u sc %p gnt %p", 1169 ref, ge, ge->ge_start, sc, sc->sc_gnt); 1170 } 1171 #endif 1172 ref -= ge->ge_start; 1173 if (ge->ge_table[ref].flags != GTF_invalid) { 1174 panic("reference %u is still in use, flags %#x frame %#x", 1175 ref + ge->ge_start, ge->ge_table[ref].flags, 1176 ge->ge_table[ref].frame); 1177 } 1178 ge->ge_table[ref].frame = atop(pa); 1179 ge->ge_table[ref].domid = domain; 1180 virtio_membar_sync(); 1181 ge->ge_table[ref].flags = GTF_permit_access | flags; 1182 virtio_membar_sync(); 1183 } 1184 1185 void 1186 xen_grant_table_remove(struct xen_softc *sc, grant_ref_t ref) 1187 { 1188 struct xen_gntent *ge; 1189 uint32_t flags, *ptr; 1190 int loop; 1191 1192 #ifdef XEN_DEBUG 1193 if (ref > sc->sc_gntcnt * GNTTAB_NEPG) 1194 panic("unmanaged ref %u sc %p gnt %p (%d)", ref, sc, 1195 sc->sc_gnt, sc->sc_gntcnt); 1196 #endif 1197 ge = &sc->sc_gnt[ref / GNTTAB_NEPG]; 1198 #ifdef XEN_DEBUG 1199 if (ref < ge->ge_start || ref > ge->ge_start + GNTTAB_NEPG) { 1200 panic("out of bounds ref %u ge %p start %u sc %p gnt %p", 1201 ref, ge, ge->ge_start, sc, sc->sc_gnt); 1202 } 1203 #endif 1204 ref -= ge->ge_start; 1205 /* Invalidate the grant reference */ 1206 virtio_membar_sync(); 1207 ptr = (uint32_t *)&ge->ge_table[ref]; 1208 flags = (ge->ge_table[ref].flags & ~(GTF_reading|GTF_writing)) | 1209 (ge->ge_table[ref].domid << 16); 1210 loop = 0; 1211 while (atomic_cas_uint(ptr, flags, GTF_invalid) != flags) { 1212 if (loop++ > 10) { 1213 panic("grant table reference %u is held " 1214 "by domain %d: frame %#x flags %#x", 1215 ref + ge->ge_start, ge->ge_table[ref].domid, 1216 ge->ge_table[ref].frame, ge->ge_table[ref].flags); 1217 } 1218 #if (defined(__amd64__) || defined(__i386__)) 1219 __asm volatile("pause": : : "memory"); 1220 #endif 1221 } 1222 ge->ge_table[ref].frame = 0xffffffff; 1223 } 1224 1225 int 1226 xen_bus_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments, 1227 bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamp) 1228 { 1229 struct xen_softc *sc = t->_cookie; 1230 struct xen_gntmap *gm; 1231 int i, error; 1232 1233 if (maxsegsz < PAGE_SIZE) 1234 return (EINVAL); 1235 1236 /* Allocate a dma map structure */ 1237 error = bus_dmamap_create(sc->sc_dmat, size, nsegments, maxsegsz, 1238 boundary, flags, dmamp); 1239 if (error) 1240 return (error); 1241 /* Allocate an array of grant table pa<->ref maps */ 1242 gm = mallocarray(nsegments, sizeof(struct xen_gntmap), M_DEVBUF, 1243 M_ZERO | ((flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)); 1244 if (gm == NULL) { 1245 bus_dmamap_destroy(sc->sc_dmat, *dmamp); 1246 *dmamp = NULL; 1247 return (ENOMEM); 1248 } 1249 /* Wire it to the dma map */ 1250 (*dmamp)->_dm_cookie = gm; 1251 /* Claim references from the grant table */ 1252 for (i = 0; i < (*dmamp)->_dm_segcnt; i++) { 1253 if (xen_grant_table_alloc(sc, &gm[i].gm_ref)) { 1254 xen_bus_dmamap_destroy(t, *dmamp); 1255 *dmamp = NULL; 1256 return (ENOBUFS); 1257 } 1258 } 1259 return (0); 1260 } 1261 1262 void 1263 xen_bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map) 1264 { 1265 struct xen_softc *sc = t->_cookie; 1266 struct xen_gntmap *gm; 1267 int i; 1268 1269 gm = map->_dm_cookie; 1270 for (i = 0; i < map->_dm_segcnt; i++) { 1271 if (gm[i].gm_ref == 0) 1272 continue; 1273 xen_grant_table_free(sc, gm[i].gm_ref); 1274 } 1275 free(gm, M_DEVBUF, map->_dm_segcnt * sizeof(struct xen_gntmap)); 1276 bus_dmamap_destroy(sc->sc_dmat, map); 1277 } 1278 1279 int 1280 xen_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf, 1281 bus_size_t buflen, struct proc *p, int flags) 1282 { 1283 struct xen_softc *sc = t->_cookie; 1284 struct xen_gntmap *gm = map->_dm_cookie; 1285 int i, domain, error; 1286 1287 domain = flags >> 16; 1288 flags &= 0xffff; 1289 error = bus_dmamap_load(sc->sc_dmat, map, buf, buflen, p, flags); 1290 if (error) 1291 return (error); 1292 for (i = 0; i < map->dm_nsegs; i++) { 1293 xen_grant_table_enter(sc, gm[i].gm_ref, map->dm_segs[i].ds_addr, 1294 domain, flags & BUS_DMA_WRITE ? GTF_readonly : 0); 1295 gm[i].gm_paddr = map->dm_segs[i].ds_addr; 1296 map->dm_segs[i].ds_addr = gm[i].gm_ref; 1297 } 1298 return (0); 1299 } 1300 1301 int 1302 xen_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m0, 1303 int flags) 1304 { 1305 struct xen_softc *sc = t->_cookie; 1306 struct xen_gntmap *gm = map->_dm_cookie; 1307 int i, domain, error; 1308 1309 domain = flags >> 16; 1310 flags &= 0xffff; 1311 error = bus_dmamap_load_mbuf(sc->sc_dmat, map, m0, flags); 1312 if (error) 1313 return (error); 1314 for (i = 0; i < map->dm_nsegs; i++) { 1315 xen_grant_table_enter(sc, gm[i].gm_ref, map->dm_segs[i].ds_addr, 1316 domain, flags & BUS_DMA_WRITE ? GTF_readonly : 0); 1317 gm[i].gm_paddr = map->dm_segs[i].ds_addr; 1318 map->dm_segs[i].ds_addr = gm[i].gm_ref; 1319 } 1320 return (0); 1321 } 1322 1323 void 1324 xen_bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map) 1325 { 1326 struct xen_softc *sc = t->_cookie; 1327 struct xen_gntmap *gm = map->_dm_cookie; 1328 int i; 1329 1330 for (i = 0; i < map->dm_nsegs; i++) { 1331 if (gm[i].gm_paddr == 0) 1332 continue; 1333 xen_grant_table_remove(sc, gm[i].gm_ref); 1334 map->dm_segs[i].ds_addr = gm[i].gm_paddr; 1335 gm[i].gm_paddr = 0; 1336 } 1337 bus_dmamap_unload(sc->sc_dmat, map); 1338 } 1339 1340 void 1341 xen_bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t addr, 1342 bus_size_t size, int op) 1343 { 1344 if ((op == (BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE)) || 1345 (op == (BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE))) 1346 virtio_membar_sync(); 1347 } 1348 1349 static int 1350 xen_attach_print(void *aux, const char *name) 1351 { 1352 struct xen_attach_args *xa = aux; 1353 1354 if (name) 1355 printf("\"%s\" at %s: %s", xa->xa_name, name, xa->xa_node); 1356 1357 return (UNCONF); 1358 } 1359 1360 int 1361 xen_attach_device(struct xen_softc *sc, struct xen_devlist *xdl, 1362 const char *name, const char *unit) 1363 { 1364 struct xen_attach_args xa; 1365 struct xen_device *xdv; 1366 unsigned long long res; 1367 1368 xa.xa_dmat = &xen_bus_dma_tag; 1369 1370 strlcpy(xa.xa_name, name, sizeof(xa.xa_name)); 1371 snprintf(xa.xa_node, sizeof(xa.xa_node), "device/%s/%s", name, unit); 1372 1373 if (xs_getprop(sc, xa.xa_node, "backend", xa.xa_backend, 1374 sizeof(xa.xa_backend))) { 1375 DPRINTF("%s: failed to identify \"backend\" for " 1376 "\"%s\"\n", sc->sc_dev.dv_xname, xa.xa_node); 1377 return (EIO); 1378 } 1379 1380 if (xs_getnum(sc, xa.xa_node, "backend-id", &res) || res > UINT16_MAX) { 1381 DPRINTF("%s: invalid \"backend-id\" for \"%s\"\n", 1382 sc->sc_dev.dv_xname, xa.xa_node); 1383 return (EIO); 1384 } 1385 xa.xa_domid = (uint16_t)res; 1386 1387 xdv = malloc(sizeof(struct xen_device), M_DEVBUF, M_ZERO | M_NOWAIT); 1388 if (xdv == NULL) 1389 return (ENOMEM); 1390 1391 strlcpy(xdv->dv_unit, unit, sizeof(xdv->dv_unit)); 1392 LIST_INSERT_HEAD(&xdl->dl_devs, xdv, dv_entry); 1393 1394 xdv->dv_dev = config_found((struct device *)sc, &xa, xen_attach_print); 1395 1396 return (0); 1397 } 1398 1399 int 1400 xen_probe_devices(struct xen_softc *sc) 1401 { 1402 struct xen_devlist *xdl; 1403 struct xs_transaction xst; 1404 struct iovec *iovp1 = NULL, *iovp2 = NULL; 1405 int i, j, error, iov1_cnt = 0, iov2_cnt = 0; 1406 char path[256]; 1407 1408 memset(&xst, 0, sizeof(xst)); 1409 xst.xst_id = 0; 1410 xst.xst_cookie = sc->sc_xs; 1411 1412 if ((error = xs_cmd(&xst, XS_LIST, "device", &iovp1, &iov1_cnt)) != 0) 1413 return (error); 1414 1415 for (i = 0; i < iov1_cnt; i++) { 1416 if (strcmp("suspend", (char *)iovp1[i].iov_base) == 0) 1417 continue; 1418 snprintf(path, sizeof(path), "device/%s", 1419 (char *)iovp1[i].iov_base); 1420 if ((error = xs_cmd(&xst, XS_LIST, path, &iovp2, 1421 &iov2_cnt)) != 0) 1422 goto out; 1423 if ((xdl = malloc(sizeof(struct xen_devlist), M_DEVBUF, 1424 M_ZERO | M_NOWAIT)) == NULL) { 1425 error = ENOMEM; 1426 goto out; 1427 } 1428 xdl->dl_xen = sc; 1429 strlcpy(xdl->dl_node, (const char *)iovp1[i].iov_base, 1430 XEN_MAX_NODE_LEN); 1431 for (j = 0; j < iov2_cnt; j++) { 1432 error = xen_attach_device(sc, xdl, 1433 (const char *)iovp1[i].iov_base, 1434 (const char *)iovp2[j].iov_base); 1435 if (error) { 1436 printf("%s: failed to attach \"%s/%s\"\n", 1437 sc->sc_dev.dv_xname, path, 1438 (const char *)iovp2[j].iov_base); 1439 goto out; 1440 } 1441 } 1442 /* Setup a watch for every device subtree */ 1443 if (xs_watch(sc, "device", (char *)iovp1[i].iov_base, 1444 &xdl->dl_task, xen_hotplug, xdl)) 1445 printf("%s: failed to setup hotplug watch for \"%s\"\n", 1446 sc->sc_dev.dv_xname, (char *)iovp1[i].iov_base); 1447 SLIST_INSERT_HEAD(&sc->sc_devlists, xdl, dl_entry); 1448 xs_resfree(&xst, iovp2, iov2_cnt); 1449 iovp2 = NULL; 1450 iov2_cnt = 0; 1451 } 1452 1453 out: 1454 if (iovp2) 1455 xs_resfree(&xst, iovp2, iov2_cnt); 1456 xs_resfree(&xst, iovp1, iov1_cnt); 1457 return (error); 1458 } 1459 1460 void 1461 xen_hotplug(void *arg) 1462 { 1463 struct xen_devlist *xdl = arg; 1464 struct xen_softc *sc = xdl->dl_xen; 1465 struct xen_device *xdv, *xvdn; 1466 struct xs_transaction xst; 1467 struct iovec *iovp = NULL; 1468 int error, i, keep, iov_cnt = 0; 1469 char path[256]; 1470 int8_t *seen; 1471 1472 memset(&xst, 0, sizeof(xst)); 1473 xst.xst_id = 0; 1474 xst.xst_cookie = sc->sc_xs; 1475 1476 snprintf(path, sizeof(path), "device/%s", xdl->dl_node); 1477 if ((error = xs_cmd(&xst, XS_LIST, path, &iovp, &iov_cnt)) != 0) 1478 return; 1479 1480 seen = malloc(iov_cnt, M_TEMP, M_ZERO | M_WAITOK); 1481 1482 /* Detect all removed and kept devices */ 1483 LIST_FOREACH_SAFE(xdv, &xdl->dl_devs, dv_entry, xvdn) { 1484 for (i = 0, keep = 0; i < iov_cnt; i++) { 1485 if (!seen[i] && 1486 !strcmp(xdv->dv_unit, (char *)iovp[i].iov_base)) { 1487 seen[i]++; 1488 keep++; 1489 break; 1490 } 1491 } 1492 if (!keep) { 1493 DPRINTF("%s: removing \"%s/%s\"\n", sc->sc_dev.dv_xname, 1494 xdl->dl_node, xdv->dv_unit); 1495 LIST_REMOVE(xdv, dv_entry); 1496 config_detach(xdv->dv_dev, 0); 1497 free(xdv, M_DEVBUF, sizeof(struct xen_device)); 1498 } 1499 } 1500 1501 /* Attach all new devices */ 1502 for (i = 0; i < iov_cnt; i++) { 1503 if (seen[i]) 1504 continue; 1505 DPRINTF("%s: attaching \"%s/%s\"\n", sc->sc_dev.dv_xname, 1506 xdl->dl_node, (const char *)iovp[i].iov_base); 1507 error = xen_attach_device(sc, xdl, xdl->dl_node, 1508 (const char *)iovp[i].iov_base); 1509 if (error) { 1510 printf("%s: failed to attach \"%s/%s\"\n", 1511 sc->sc_dev.dv_xname, path, 1512 (const char *)iovp[i].iov_base); 1513 continue; 1514 } 1515 } 1516 1517 free(seen, M_TEMP, iov_cnt); 1518 1519 xs_resfree(&xst, iovp, iov_cnt); 1520 } 1521 1522 #include <machine/pio.h> 1523 1524 #define XMI_PORT 0x10 1525 #define XMI_MAGIC 0x49d2 1526 #define XMI_UNPLUG_IDE 0x01 1527 #define XMI_UNPLUG_NIC 0x02 1528 #define XMI_UNPLUG_IDESEC 0x04 1529 1530 void 1531 xen_disable_emulated_devices(struct xen_softc *sc) 1532 { 1533 #if defined(__i386__) || defined(__amd64__) 1534 ushort unplug = 0; 1535 1536 if (inw(XMI_PORT) != XMI_MAGIC) { 1537 printf("%s: failed to disable emulated devices\n", 1538 sc->sc_dev.dv_xname); 1539 return; 1540 } 1541 if (sc->sc_unplug & XEN_UNPLUG_IDE) 1542 unplug |= XMI_UNPLUG_IDE; 1543 if (sc->sc_unplug & XEN_UNPLUG_IDESEC) 1544 unplug |= XMI_UNPLUG_IDESEC; 1545 if (sc->sc_unplug & XEN_UNPLUG_NIC) 1546 unplug |= XMI_UNPLUG_NIC; 1547 if (unplug) 1548 outw(XMI_PORT, unplug); 1549 #endif /* __i386__ || __amd64__ */ 1550 } 1551 1552 void 1553 xen_unplug_emulated(void *xsc, int what) 1554 { 1555 struct xen_softc *sc = xsc; 1556 1557 sc->sc_unplug |= what; 1558 } 1559