1 /* $OpenBSD: xen.c,v 1.91 2017/11/26 16:11:45 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; 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 return (0); 655 eu.port = xi->xi_port; 656 xen_intsrc_release(sc, xi); 657 return (xen_evtchn_hypercall(sc, EVTCHNOP_unmask, &eu, sizeof(eu))); 658 } 659 660 void 661 xen_intr_ack(void) 662 { 663 struct xen_softc *sc = xen_sc; 664 struct shared_info *s = sc->sc_ipg; 665 struct cpu_info *ci = curcpu(); 666 struct vcpu_info *v = &s->vcpu_info[CPU_INFO_UNIT(ci)]; 667 668 v->evtchn_upcall_pending = 0; 669 virtio_membar_sync(); 670 } 671 672 void 673 xen_intr(void) 674 { 675 struct xen_softc *sc = xen_sc; 676 struct xen_intsrc *xi; 677 struct shared_info *s = sc->sc_ipg; 678 struct cpu_info *ci = curcpu(); 679 struct vcpu_info *v = &s->vcpu_info[CPU_INFO_UNIT(ci)]; 680 ulong pending, selector; 681 int port, bit, row; 682 683 v->evtchn_upcall_pending = 0; 684 selector = atomic_swap_ulong(&v->evtchn_pending_sel, 0); 685 686 for (row = 0; selector > 0; selector >>= 1, row++) { 687 if ((selector & 1) == 0) 688 continue; 689 if ((sc->sc_ipg->evtchn_pending[row] & 690 ~(sc->sc_ipg->evtchn_mask[row])) == 0) 691 continue; 692 pending = atomic_swap_ulong(&sc->sc_ipg->evtchn_pending[row], 693 0) & ~(sc->sc_ipg->evtchn_mask[row]); 694 for (bit = 0; pending > 0; pending >>= 1, bit++) { 695 if ((pending & 1) == 0) 696 continue; 697 port = (row * LONG_BIT) + bit; 698 if ((xi = xen_intsrc_acquire(sc, port)) == NULL) { 699 printf("%s: unhandled interrupt on port %d\n", 700 sc->sc_dev.dv_xname, port); 701 continue; 702 } 703 xi->xi_evcnt.ec_count++; 704 xen_intr_mask_acquired(sc, xi); 705 task_add(xi->xi_taskq, &xi->xi_task); 706 } 707 } 708 } 709 710 void 711 xen_intr_schedule(xen_intr_handle_t xih) 712 { 713 struct xen_softc *sc = xen_sc; 714 struct xen_intsrc *xi; 715 716 if ((xi = xen_intsrc_acquire(sc, (evtchn_port_t)xih)) != NULL) 717 task_add(xi->xi_taskq, &xi->xi_task); 718 } 719 720 /* 721 * This code achieves two goals: 1) makes sure that *after* masking 722 * the interrupt source we're not getting more task_adds: intr_barrier 723 * will take care of that, and 2) makes sure that the interrupt task 724 * has finished executing the current task and won't be called again: 725 * it sets up a barrier task to await completion of the current task 726 * and relies on the interrupt masking to prevent submission of new 727 * tasks in the future. 728 */ 729 void 730 xen_intr_barrier(xen_intr_handle_t xih) 731 { 732 struct xen_softc *sc = xen_sc; 733 struct xen_intsrc *xi; 734 735 /* 736 * XXX This will need to be revised once intr_barrier starts 737 * using its argument. 738 */ 739 intr_barrier(NULL); 740 741 if ((xi = xen_intsrc_acquire(sc, (evtchn_port_t)xih)) != NULL) { 742 taskq_barrier(xi->xi_taskq); 743 xen_intsrc_release(sc, xi); 744 } 745 } 746 747 void 748 xen_intr_signal(xen_intr_handle_t xih) 749 { 750 struct xen_softc *sc = xen_sc; 751 struct xen_intsrc *xi; 752 struct evtchn_send es; 753 754 if ((xi = xen_intsrc_acquire(sc, (evtchn_port_t)xih)) != NULL) { 755 es.port = xi->xi_port; 756 xen_intsrc_release(sc, xi); 757 xen_evtchn_hypercall(sc, EVTCHNOP_send, &es, sizeof(es)); 758 } 759 } 760 761 int 762 xen_intr_establish(evtchn_port_t port, xen_intr_handle_t *xih, int domain, 763 void (*handler)(void *), void *arg, char *name) 764 { 765 struct xen_softc *sc = xen_sc; 766 struct xen_intsrc *xi; 767 struct evtchn_alloc_unbound eau; 768 #ifdef notyet 769 struct evtchn_bind_vcpu ebv; 770 #endif 771 #if defined(XEN_DEBUG) && disabled 772 struct evtchn_status es; 773 #endif 774 775 if (port && (xi = xen_intsrc_acquire(sc, port)) != NULL) { 776 xen_intsrc_release(sc, xi); 777 DPRINTF("%s: interrupt handler has already been established " 778 "for port %u\n", sc->sc_dev.dv_xname, port); 779 return (-1); 780 } 781 782 xi = malloc(sizeof(*xi), M_DEVBUF, M_NOWAIT | M_ZERO); 783 if (xi == NULL) 784 return (-1); 785 786 xi->xi_port = (evtchn_port_t)*xih; 787 788 xi->xi_handler = handler; 789 xi->xi_ctx = arg; 790 791 xi->xi_taskq = taskq_create(name, 1, IPL_NET, TASKQ_MPSAFE); 792 if (!xi->xi_taskq) { 793 printf("%s: failed to create interrupt task for %s\n", 794 sc->sc_dev.dv_xname, name); 795 free(xi, M_DEVBUF, sizeof(*xi)); 796 return (-1); 797 } 798 task_set(&xi->xi_task, xen_intr_dispatch, xi); 799 800 if (port == 0) { 801 /* We're being asked to allocate a new event port */ 802 memset(&eau, 0, sizeof(eau)); 803 eau.dom = DOMID_SELF; 804 eau.remote_dom = domain; 805 if (xen_evtchn_hypercall(sc, EVTCHNOP_alloc_unbound, &eau, 806 sizeof(eau)) != 0) { 807 DPRINTF("%s: failed to allocate new event port\n", 808 sc->sc_dev.dv_xname); 809 free(xi, M_DEVBUF, sizeof(*xi)); 810 return (-1); 811 } 812 *xih = xi->xi_port = eau.port; 813 } else { 814 *xih = xi->xi_port = port; 815 /* 816 * The Event Channel API didn't open this port, so it is not 817 * responsible for closing it automatically on unbind. 818 */ 819 xi->xi_noclose = 1; 820 } 821 822 #ifdef notyet 823 /* Bind interrupt to VCPU#0 */ 824 memset(&ebv, 0, sizeof(ebv)); 825 ebv.port = xi->xi_port; 826 ebv.vcpu = 0; 827 if (xen_evtchn_hypercall(sc, EVTCHNOP_bind_vcpu, &ebv, sizeof(ebv))) { 828 printf("%s: failed to bind interrupt on port %u to vcpu%d\n", 829 sc->sc_dev.dv_xname, ebv.port, ebv.vcpu); 830 } 831 #endif 832 833 evcount_attach(&xi->xi_evcnt, name, &sc->sc_irq); 834 835 xen_intsrc_add(sc, xi); 836 837 /* Mask the event port */ 838 set_bit(xi->xi_port, &sc->sc_ipg->evtchn_mask[0]); 839 840 #if defined(XEN_DEBUG) && disabled 841 memset(&es, 0, sizeof(es)); 842 es.dom = DOMID_SELF; 843 es.port = xi->xi_port; 844 if (xen_evtchn_hypercall(sc, EVTCHNOP_status, &es, sizeof(es))) { 845 printf("%s: failed to obtain status for port %d\n", 846 sc->sc_dev.dv_xname, es.port); 847 } 848 printf("%s: port %u bound to vcpu%u", sc->sc_dev.dv_xname, 849 es.port, es.vcpu); 850 if (es.status == EVTCHNSTAT_interdomain) 851 printf(": domain %d port %u\n", es.u.interdomain.dom, 852 es.u.interdomain.port); 853 else if (es.status == EVTCHNSTAT_unbound) 854 printf(": domain %d\n", es.u.unbound.dom); 855 else if (es.status == EVTCHNSTAT_pirq) 856 printf(": pirq %u\n", es.u.pirq); 857 else if (es.status == EVTCHNSTAT_virq) 858 printf(": virq %u\n", es.u.virq); 859 else 860 printf("\n"); 861 #endif 862 863 return (0); 864 } 865 866 int 867 xen_intr_disestablish(xen_intr_handle_t xih) 868 { 869 struct xen_softc *sc = xen_sc; 870 evtchn_port_t port = (evtchn_port_t)xih; 871 struct evtchn_close ec; 872 struct xen_intsrc *xi; 873 874 if ((xi = xen_intsrc_remove(sc, port)) == NULL) 875 return (-1); 876 877 evcount_detach(&xi->xi_evcnt); 878 879 taskq_destroy(xi->xi_taskq); 880 881 set_bit(xi->xi_port, &sc->sc_ipg->evtchn_mask[0]); 882 clear_bit(xi->xi_port, &sc->sc_ipg->evtchn_pending[0]); 883 884 if (!xi->xi_noclose) { 885 ec.port = xi->xi_port; 886 if (xen_evtchn_hypercall(sc, EVTCHNOP_close, &ec, sizeof(ec))) { 887 DPRINTF("%s: failed to close event port %u\n", 888 sc->sc_dev.dv_xname, xi->xi_port); 889 } 890 } 891 892 free(xi, M_DEVBUF, sizeof(*xi)); 893 return (0); 894 } 895 896 void 897 xen_intr_dispatch(void *arg) 898 { 899 struct xen_softc *sc = xen_sc; 900 struct xen_intsrc *xi = arg; 901 902 if (xi->xi_handler) 903 xi->xi_handler(xi->xi_ctx); 904 905 xen_intr_unmask_release(sc, xi); 906 } 907 908 void 909 xen_intr_enable(void) 910 { 911 struct xen_softc *sc = xen_sc; 912 struct xen_intsrc *xi; 913 struct evtchn_unmask eu; 914 915 mtx_enter(&sc->sc_islck); 916 SLIST_FOREACH(xi, &sc->sc_intrs, xi_entry) { 917 if (!xi->xi_masked) { 918 eu.port = xi->xi_port; 919 if (xen_evtchn_hypercall(sc, EVTCHNOP_unmask, &eu, 920 sizeof(eu))) 921 printf("%s: unmasking port %u failed\n", 922 sc->sc_dev.dv_xname, xi->xi_port); 923 virtio_membar_sync(); 924 if (test_bit(xi->xi_port, &sc->sc_ipg->evtchn_mask[0])) 925 printf("%s: port %u is still masked\n", 926 sc->sc_dev.dv_xname, xi->xi_port); 927 } 928 } 929 mtx_leave(&sc->sc_islck); 930 } 931 932 void 933 xen_intr_mask(xen_intr_handle_t xih) 934 { 935 struct xen_softc *sc = xen_sc; 936 evtchn_port_t port = (evtchn_port_t)xih; 937 struct xen_intsrc *xi; 938 939 if ((xi = xen_intsrc_acquire(sc, port)) != NULL) { 940 xen_intr_mask_acquired(sc, xi); 941 xen_intsrc_release(sc, xi); 942 } 943 } 944 945 int 946 xen_intr_unmask(xen_intr_handle_t xih) 947 { 948 struct xen_softc *sc = xen_sc; 949 evtchn_port_t port = (evtchn_port_t)xih; 950 struct xen_intsrc *xi; 951 952 if ((xi = xen_intsrc_acquire(sc, port)) != NULL) 953 return (xen_intr_unmask_release(sc, xi)); 954 955 return (0); 956 } 957 958 int 959 xen_init_grant_tables(struct xen_softc *sc) 960 { 961 struct gnttab_query_size gqs; 962 963 gqs.dom = DOMID_SELF; 964 if (xen_hypercall(sc, XC_GNTTAB, 3, GNTTABOP_query_size, &gqs, 1)) { 965 printf(": failed the query for grant table pages\n"); 966 return (-1); 967 } 968 if (gqs.nr_frames == 0 || gqs.nr_frames > gqs.max_nr_frames) { 969 printf(": invalid number of grant table pages: %u/%u\n", 970 gqs.nr_frames, gqs.max_nr_frames); 971 return (-1); 972 } 973 974 sc->sc_gntmax = gqs.max_nr_frames; 975 976 sc->sc_gnt = mallocarray(sc->sc_gntmax + 1, sizeof(struct xen_gntent), 977 M_DEVBUF, M_ZERO | M_NOWAIT); 978 if (sc->sc_gnt == NULL) { 979 printf(": failed to allocate grant table lookup table\n"); 980 return (-1); 981 } 982 983 mtx_init(&sc->sc_gntlck, IPL_NET); 984 985 if (xen_grant_table_grow(sc) == NULL) { 986 free(sc->sc_gnt, M_DEVBUF, sc->sc_gntmax * 987 sizeof(struct xen_gntent)); 988 return (-1); 989 } 990 991 printf(", %d grant table frames", sc->sc_gntmax); 992 993 xen_bus_dma_tag._cookie = sc; 994 995 return (0); 996 } 997 998 struct xen_gntent * 999 xen_grant_table_grow(struct xen_softc *sc) 1000 { 1001 struct xen_add_to_physmap xatp; 1002 struct xen_gntent *ge; 1003 void *va; 1004 paddr_t pa; 1005 1006 if (sc->sc_gntcnt == sc->sc_gntmax) { 1007 printf("%s: grant table frame allotment limit reached\n", 1008 sc->sc_dev.dv_xname); 1009 return (NULL); 1010 } 1011 1012 va = km_alloc(PAGE_SIZE, &kv_any, &kp_zero, &kd_nowait); 1013 if (va == NULL) 1014 return (NULL); 1015 if (!pmap_extract(pmap_kernel(), (vaddr_t)va, &pa)) { 1016 printf("%s: grant table page PA extraction failed\n", 1017 sc->sc_dev.dv_xname); 1018 km_free(va, PAGE_SIZE, &kv_any, &kp_zero); 1019 return (NULL); 1020 } 1021 1022 mtx_enter(&sc->sc_gntlck); 1023 1024 ge = &sc->sc_gnt[sc->sc_gntcnt]; 1025 ge->ge_table = va; 1026 1027 xatp.domid = DOMID_SELF; 1028 xatp.idx = sc->sc_gntcnt; 1029 xatp.space = XENMAPSPACE_grant_table; 1030 xatp.gpfn = atop(pa); 1031 if (xen_hypercall(sc, XC_MEMORY, 2, XENMEM_add_to_physmap, &xatp)) { 1032 printf("%s: failed to add a grant table page\n", 1033 sc->sc_dev.dv_xname); 1034 km_free(ge->ge_table, PAGE_SIZE, &kv_any, &kp_zero); 1035 mtx_leave(&sc->sc_gntlck); 1036 return (NULL); 1037 } 1038 ge->ge_start = sc->sc_gntcnt * GNTTAB_NEPG; 1039 /* First page has 8 reserved entries */ 1040 ge->ge_reserved = ge->ge_start == 0 ? GNTTAB_NR_RESERVED_ENTRIES : 0; 1041 ge->ge_free = GNTTAB_NEPG - ge->ge_reserved; 1042 ge->ge_next = ge->ge_reserved; 1043 mtx_init(&ge->ge_lock, IPL_NET); 1044 1045 sc->sc_gntcnt++; 1046 mtx_leave(&sc->sc_gntlck); 1047 1048 return (ge); 1049 } 1050 1051 int 1052 xen_grant_table_alloc(struct xen_softc *sc, grant_ref_t *ref) 1053 { 1054 struct xen_gntent *ge; 1055 int i; 1056 1057 /* Start with a previously allocated table page */ 1058 ge = &sc->sc_gnt[sc->sc_gntcnt - 1]; 1059 if (ge->ge_free > 0) { 1060 mtx_enter(&ge->ge_lock); 1061 if (ge->ge_free > 0) 1062 goto search; 1063 mtx_leave(&ge->ge_lock); 1064 } 1065 1066 /* Try other existing table pages */ 1067 for (i = 0; i < sc->sc_gntcnt; i++) { 1068 ge = &sc->sc_gnt[i]; 1069 if (ge->ge_free == 0) 1070 continue; 1071 mtx_enter(&ge->ge_lock); 1072 if (ge->ge_free > 0) 1073 goto search; 1074 mtx_leave(&ge->ge_lock); 1075 } 1076 1077 alloc: 1078 /* Allocate a new table page */ 1079 if ((ge = xen_grant_table_grow(sc)) == NULL) 1080 return (-1); 1081 1082 mtx_enter(&ge->ge_lock); 1083 if (ge->ge_free == 0) { 1084 /* We were not fast enough... */ 1085 mtx_leave(&ge->ge_lock); 1086 goto alloc; 1087 } 1088 1089 search: 1090 for (i = ge->ge_next; 1091 /* Math works here because GNTTAB_NEPG is a power of 2 */ 1092 i != ((ge->ge_next + GNTTAB_NEPG - 1) & (GNTTAB_NEPG - 1)); 1093 i++) { 1094 if (i == GNTTAB_NEPG) 1095 i = 0; 1096 if (ge->ge_reserved && i < ge->ge_reserved) 1097 continue; 1098 if (ge->ge_table[i].frame != 0) 1099 continue; 1100 *ref = ge->ge_start + i; 1101 ge->ge_table[i].flags = GTF_invalid; 1102 ge->ge_table[i].frame = 0xffffffff; /* Mark as taken */ 1103 if ((ge->ge_next = i + 1) == GNTTAB_NEPG) 1104 ge->ge_next = ge->ge_reserved; 1105 ge->ge_free--; 1106 mtx_leave(&ge->ge_lock); 1107 return (0); 1108 } 1109 mtx_leave(&ge->ge_lock); 1110 1111 panic("page full, sc %p gnt %p (%d) ge %p", sc, sc->sc_gnt, 1112 sc->sc_gntcnt, ge); 1113 return (-1); 1114 } 1115 1116 void 1117 xen_grant_table_free(struct xen_softc *sc, grant_ref_t ref) 1118 { 1119 struct xen_gntent *ge; 1120 1121 #ifdef XEN_DEBUG 1122 if (ref > sc->sc_gntcnt * GNTTAB_NEPG) 1123 panic("unmanaged ref %u sc %p gnt %p (%d)", ref, sc, 1124 sc->sc_gnt, sc->sc_gntcnt); 1125 #endif 1126 ge = &sc->sc_gnt[ref / GNTTAB_NEPG]; 1127 mtx_enter(&ge->ge_lock); 1128 #ifdef XEN_DEBUG 1129 if (ref < ge->ge_start || ref > ge->ge_start + GNTTAB_NEPG) { 1130 mtx_leave(&ge->ge_lock); 1131 panic("out of bounds ref %u ge %p start %u sc %p gnt %p", 1132 ref, ge, ge->ge_start, sc, sc->sc_gnt); 1133 } 1134 #endif 1135 ref -= ge->ge_start; 1136 if (ge->ge_table[ref].flags != GTF_invalid) { 1137 mtx_leave(&ge->ge_lock); 1138 panic("reference %u is still in use, flags %#x frame %#x", 1139 ref + ge->ge_start, ge->ge_table[ref].flags, 1140 ge->ge_table[ref].frame); 1141 } 1142 ge->ge_table[ref].frame = 0; 1143 ge->ge_next = ref; 1144 ge->ge_free++; 1145 mtx_leave(&ge->ge_lock); 1146 } 1147 1148 void 1149 xen_grant_table_enter(struct xen_softc *sc, grant_ref_t ref, paddr_t pa, 1150 int domain, int flags) 1151 { 1152 struct xen_gntent *ge; 1153 1154 #ifdef XEN_DEBUG 1155 if (ref > sc->sc_gntcnt * GNTTAB_NEPG) 1156 panic("unmanaged ref %u sc %p gnt %p (%d)", ref, sc, 1157 sc->sc_gnt, sc->sc_gntcnt); 1158 #endif 1159 ge = &sc->sc_gnt[ref / GNTTAB_NEPG]; 1160 #ifdef XEN_DEBUG 1161 if (ref < ge->ge_start || ref > ge->ge_start + GNTTAB_NEPG) { 1162 panic("out of bounds ref %u ge %p start %u sc %p gnt %p", 1163 ref, ge, ge->ge_start, sc, sc->sc_gnt); 1164 } 1165 #endif 1166 ref -= ge->ge_start; 1167 if (ge->ge_table[ref].flags != GTF_invalid) { 1168 panic("reference %u is still in use, flags %#x frame %#x", 1169 ref + ge->ge_start, ge->ge_table[ref].flags, 1170 ge->ge_table[ref].frame); 1171 } 1172 ge->ge_table[ref].frame = atop(pa); 1173 ge->ge_table[ref].domid = domain; 1174 virtio_membar_sync(); 1175 ge->ge_table[ref].flags = GTF_permit_access | flags; 1176 virtio_membar_sync(); 1177 } 1178 1179 void 1180 xen_grant_table_remove(struct xen_softc *sc, grant_ref_t ref) 1181 { 1182 struct xen_gntent *ge; 1183 uint32_t flags, *ptr; 1184 int loop; 1185 1186 #ifdef XEN_DEBUG 1187 if (ref > sc->sc_gntcnt * GNTTAB_NEPG) 1188 panic("unmanaged ref %u sc %p gnt %p (%d)", ref, sc, 1189 sc->sc_gnt, sc->sc_gntcnt); 1190 #endif 1191 ge = &sc->sc_gnt[ref / GNTTAB_NEPG]; 1192 #ifdef XEN_DEBUG 1193 if (ref < ge->ge_start || ref > ge->ge_start + GNTTAB_NEPG) { 1194 panic("out of bounds ref %u ge %p start %u sc %p gnt %p", 1195 ref, ge, ge->ge_start, sc, sc->sc_gnt); 1196 } 1197 #endif 1198 ref -= ge->ge_start; 1199 /* Invalidate the grant reference */ 1200 virtio_membar_sync(); 1201 ptr = (uint32_t *)&ge->ge_table[ref]; 1202 flags = (ge->ge_table[ref].flags & ~(GTF_reading|GTF_writing)) | 1203 (ge->ge_table[ref].domid << 16); 1204 loop = 0; 1205 while (atomic_cas_uint(ptr, flags, GTF_invalid) != flags) { 1206 if (loop++ > 10) { 1207 panic("%s: grant table reference %u is held " 1208 "by domain %d: frame %#x flags %#x\n", 1209 sc->sc_dev.dv_xname, ref + ge->ge_start, 1210 ge->ge_table[ref].domid, ge->ge_table[ref].frame, 1211 ge->ge_table[ref].flags); 1212 } 1213 #if (defined(__amd64__) || defined(__i386__)) 1214 __asm volatile("pause": : : "memory"); 1215 #endif 1216 } 1217 ge->ge_table[ref].frame = 0xffffffff; 1218 } 1219 1220 int 1221 xen_bus_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments, 1222 bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamp) 1223 { 1224 struct xen_softc *sc = t->_cookie; 1225 struct xen_gntmap *gm; 1226 int i, error; 1227 1228 if (maxsegsz < PAGE_SIZE) 1229 return (EINVAL); 1230 1231 /* Allocate a dma map structure */ 1232 error = bus_dmamap_create(sc->sc_dmat, size, nsegments, maxsegsz, 1233 boundary, flags, dmamp); 1234 if (error) 1235 return (error); 1236 /* Allocate an array of grant table pa<->ref maps */ 1237 gm = mallocarray(nsegments, sizeof(struct xen_gntmap), M_DEVBUF, 1238 M_ZERO | ((flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)); 1239 if (gm == NULL) { 1240 bus_dmamap_destroy(sc->sc_dmat, *dmamp); 1241 *dmamp = NULL; 1242 return (ENOMEM); 1243 } 1244 /* Wire it to the dma map */ 1245 (*dmamp)->_dm_cookie = gm; 1246 /* Claim references from the grant table */ 1247 for (i = 0; i < (*dmamp)->_dm_segcnt; i++) { 1248 if (xen_grant_table_alloc(sc, &gm[i].gm_ref)) { 1249 xen_bus_dmamap_destroy(t, *dmamp); 1250 *dmamp = NULL; 1251 return (ENOBUFS); 1252 } 1253 } 1254 return (0); 1255 } 1256 1257 void 1258 xen_bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map) 1259 { 1260 struct xen_softc *sc = t->_cookie; 1261 struct xen_gntmap *gm; 1262 int i; 1263 1264 gm = map->_dm_cookie; 1265 for (i = 0; i < map->_dm_segcnt; i++) { 1266 if (gm[i].gm_ref == 0) 1267 continue; 1268 xen_grant_table_free(sc, gm[i].gm_ref); 1269 } 1270 free(gm, M_DEVBUF, map->_dm_segcnt * sizeof(struct xen_gntmap)); 1271 bus_dmamap_destroy(sc->sc_dmat, map); 1272 } 1273 1274 int 1275 xen_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf, 1276 bus_size_t buflen, struct proc *p, int flags) 1277 { 1278 struct xen_softc *sc = t->_cookie; 1279 struct xen_gntmap *gm = map->_dm_cookie; 1280 int i, domain, error; 1281 1282 domain = flags >> 16; 1283 flags &= 0xffff; 1284 error = bus_dmamap_load(sc->sc_dmat, map, buf, buflen, p, flags); 1285 if (error) 1286 return (error); 1287 for (i = 0; i < map->dm_nsegs; i++) { 1288 xen_grant_table_enter(sc, gm[i].gm_ref, map->dm_segs[i].ds_addr, 1289 domain, flags & BUS_DMA_WRITE ? GTF_readonly : 0); 1290 gm[i].gm_paddr = map->dm_segs[i].ds_addr; 1291 map->dm_segs[i].ds_addr = gm[i].gm_ref; 1292 } 1293 return (0); 1294 } 1295 1296 int 1297 xen_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m0, 1298 int flags) 1299 { 1300 struct xen_softc *sc = t->_cookie; 1301 struct xen_gntmap *gm = map->_dm_cookie; 1302 int i, domain, error; 1303 1304 domain = flags >> 16; 1305 flags &= 0xffff; 1306 error = bus_dmamap_load_mbuf(sc->sc_dmat, map, m0, flags); 1307 if (error) 1308 return (error); 1309 for (i = 0; i < map->dm_nsegs; i++) { 1310 xen_grant_table_enter(sc, gm[i].gm_ref, map->dm_segs[i].ds_addr, 1311 domain, flags & BUS_DMA_WRITE ? GTF_readonly : 0); 1312 gm[i].gm_paddr = map->dm_segs[i].ds_addr; 1313 map->dm_segs[i].ds_addr = gm[i].gm_ref; 1314 } 1315 return (0); 1316 } 1317 1318 void 1319 xen_bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map) 1320 { 1321 struct xen_softc *sc = t->_cookie; 1322 struct xen_gntmap *gm = map->_dm_cookie; 1323 int i; 1324 1325 for (i = 0; i < map->dm_nsegs; i++) { 1326 if (gm[i].gm_paddr == 0) 1327 continue; 1328 xen_grant_table_remove(sc, gm[i].gm_ref); 1329 map->dm_segs[i].ds_addr = gm[i].gm_paddr; 1330 gm[i].gm_paddr = 0; 1331 } 1332 bus_dmamap_unload(sc->sc_dmat, map); 1333 } 1334 1335 void 1336 xen_bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t addr, 1337 bus_size_t size, int op) 1338 { 1339 if ((op == (BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE)) || 1340 (op == (BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE))) 1341 virtio_membar_sync(); 1342 } 1343 1344 static int 1345 xen_attach_print(void *aux, const char *name) 1346 { 1347 struct xen_attach_args *xa = aux; 1348 1349 if (name) 1350 printf("\"%s\" at %s: %s", xa->xa_name, name, xa->xa_node); 1351 1352 return (UNCONF); 1353 } 1354 1355 int 1356 xen_attach_device(struct xen_softc *sc, struct xen_devlist *xdl, 1357 const char *name, const char *unit) 1358 { 1359 struct xen_attach_args xa; 1360 struct xen_device *xdv; 1361 unsigned long long res; 1362 1363 xa.xa_dmat = &xen_bus_dma_tag; 1364 1365 strlcpy(xa.xa_name, name, sizeof(xa.xa_name)); 1366 snprintf(xa.xa_node, sizeof(xa.xa_node), "device/%s/%s", name, unit); 1367 1368 if (xs_getprop(sc, xa.xa_node, "backend", xa.xa_backend, 1369 sizeof(xa.xa_backend))) { 1370 DPRINTF("%s: failed to identify \"backend\" for " 1371 "\"%s\"\n", sc->sc_dev.dv_xname, xa.xa_node); 1372 return (EIO); 1373 } 1374 1375 if (xs_getnum(sc, xa.xa_node, "backend-id", &res) || res > UINT16_MAX) { 1376 DPRINTF("%s: invalid \"backend-id\" for \"%s\"\n", 1377 sc->sc_dev.dv_xname, xa.xa_node); 1378 return (EIO); 1379 } 1380 xa.xa_domid = (uint16_t)res; 1381 1382 xdv = malloc(sizeof(struct xen_device), M_DEVBUF, M_ZERO | M_NOWAIT); 1383 if (xdv == NULL) 1384 return (ENOMEM); 1385 1386 strlcpy(xdv->dv_unit, unit, sizeof(xdv->dv_unit)); 1387 LIST_INSERT_HEAD(&xdl->dl_devs, xdv, dv_entry); 1388 1389 xdv->dv_dev = config_found((struct device *)sc, &xa, xen_attach_print); 1390 1391 return (0); 1392 } 1393 1394 int 1395 xen_probe_devices(struct xen_softc *sc) 1396 { 1397 struct xen_devlist *xdl; 1398 struct xs_transaction xst; 1399 struct iovec *iovp1 = NULL, *iovp2 = NULL; 1400 int i, j, error, iov1_cnt = 0, iov2_cnt = 0; 1401 char path[256]; 1402 1403 memset(&xst, 0, sizeof(xst)); 1404 xst.xst_id = 0; 1405 xst.xst_cookie = sc->sc_xs; 1406 1407 if ((error = xs_cmd(&xst, XS_LIST, "device", &iovp1, &iov1_cnt)) != 0) 1408 return (error); 1409 1410 for (i = 0; i < iov1_cnt; i++) { 1411 if (strcmp("suspend", (char *)iovp1[i].iov_base) == 0) 1412 continue; 1413 snprintf(path, sizeof(path), "device/%s", 1414 (char *)iovp1[i].iov_base); 1415 if ((error = xs_cmd(&xst, XS_LIST, path, &iovp2, 1416 &iov2_cnt)) != 0) 1417 goto out; 1418 if ((xdl = malloc(sizeof(struct xen_devlist), M_DEVBUF, 1419 M_ZERO | M_NOWAIT)) == NULL) { 1420 error = ENOMEM; 1421 goto out; 1422 } 1423 xdl->dl_xen = sc; 1424 strlcpy(xdl->dl_node, (const char *)iovp1[i].iov_base, 1425 XEN_MAX_NODE_LEN); 1426 for (j = 0; j < iov2_cnt; j++) { 1427 error = xen_attach_device(sc, xdl, 1428 (const char *)iovp1[i].iov_base, 1429 (const char *)iovp2[j].iov_base); 1430 if (error) { 1431 printf("%s: failed to attach \"%s/%s\"\n", 1432 sc->sc_dev.dv_xname, path, 1433 (const char *)iovp2[j].iov_base); 1434 goto out; 1435 } 1436 } 1437 /* Setup a watch for every device subtree */ 1438 if (xs_watch(sc, "device", (char *)iovp1[i].iov_base, 1439 &xdl->dl_task, xen_hotplug, xdl)) 1440 printf("%s: failed to setup hotplug watch for \"%s\"\n", 1441 sc->sc_dev.dv_xname, (char *)iovp1[i].iov_base); 1442 SLIST_INSERT_HEAD(&sc->sc_devlists, xdl, dl_entry); 1443 xs_resfree(&xst, iovp2, iov2_cnt); 1444 iovp2 = NULL; 1445 iov2_cnt = 0; 1446 } 1447 1448 out: 1449 if (iovp2) 1450 xs_resfree(&xst, iovp2, iov2_cnt); 1451 xs_resfree(&xst, iovp1, iov1_cnt); 1452 return (error); 1453 } 1454 1455 void 1456 xen_hotplug(void *arg) 1457 { 1458 struct xen_devlist *xdl = arg; 1459 struct xen_softc *sc = xdl->dl_xen; 1460 struct xen_device *xdv, *xvdn; 1461 struct xs_transaction xst; 1462 struct iovec *iovp = NULL; 1463 int error, i, keep, iov_cnt = 0; 1464 char path[256]; 1465 int8_t *seen; 1466 1467 memset(&xst, 0, sizeof(xst)); 1468 xst.xst_id = 0; 1469 xst.xst_cookie = sc->sc_xs; 1470 1471 snprintf(path, sizeof(path), "device/%s", xdl->dl_node); 1472 if ((error = xs_cmd(&xst, XS_LIST, path, &iovp, &iov_cnt)) != 0) 1473 return; 1474 1475 seen = malloc(iov_cnt, M_TEMP, M_ZERO | M_WAITOK); 1476 1477 /* Detect all removed and kept devices */ 1478 LIST_FOREACH_SAFE(xdv, &xdl->dl_devs, dv_entry, xvdn) { 1479 for (i = 0, keep = 0; i < iov_cnt; i++) { 1480 if (!seen[i] && 1481 !strcmp(xdv->dv_unit, (char *)iovp[i].iov_base)) { 1482 seen[i]++; 1483 keep++; 1484 break; 1485 } 1486 } 1487 if (!keep) { 1488 DPRINTF("%s: removing \"%s/%s\"\n", sc->sc_dev.dv_xname, 1489 xdl->dl_node, xdv->dv_unit); 1490 LIST_REMOVE(xdv, dv_entry); 1491 config_detach(xdv->dv_dev, 0); 1492 free(xdv, M_DEVBUF, sizeof(struct xen_device)); 1493 } 1494 } 1495 1496 /* Attach all new devices */ 1497 for (i = 0; i < iov_cnt; i++) { 1498 if (seen[i]) 1499 continue; 1500 DPRINTF("%s: attaching \"%s/%s\"\n", sc->sc_dev.dv_xname, 1501 xdl->dl_node, (const char *)iovp[i].iov_base); 1502 error = xen_attach_device(sc, xdl, xdl->dl_node, 1503 (const char *)iovp[i].iov_base); 1504 if (error) { 1505 printf("%s: failed to attach \"%s/%s\"\n", 1506 sc->sc_dev.dv_xname, path, 1507 (const char *)iovp[i].iov_base); 1508 continue; 1509 } 1510 } 1511 1512 free(seen, M_TEMP, iov_cnt); 1513 1514 xs_resfree(&xst, iovp, iov_cnt); 1515 } 1516 1517 #include <machine/pio.h> 1518 1519 #define XMI_PORT 0x10 1520 #define XMI_MAGIC 0x49d2 1521 #define XMI_UNPLUG_IDE 0x01 1522 #define XMI_UNPLUG_NIC 0x02 1523 #define XMI_UNPLUG_IDESEC 0x04 1524 1525 void 1526 xen_disable_emulated_devices(struct xen_softc *sc) 1527 { 1528 #if defined(__i386__) || defined(__amd64__) 1529 ushort unplug = 0; 1530 1531 if (inw(XMI_PORT) != XMI_MAGIC) { 1532 printf("%s: failed to disable emulated devices\n", 1533 sc->sc_dev.dv_xname); 1534 return; 1535 } 1536 if (sc->sc_unplug & XEN_UNPLUG_IDE) 1537 unplug |= XMI_UNPLUG_IDE; 1538 if (sc->sc_unplug & XEN_UNPLUG_IDESEC) 1539 unplug |= XMI_UNPLUG_IDESEC; 1540 if (sc->sc_unplug & XEN_UNPLUG_NIC) 1541 unplug |= XMI_UNPLUG_NIC; 1542 if (unplug) 1543 outw(XMI_PORT, unplug); 1544 #endif /* __i386__ || __amd64__ */ 1545 } 1546 1547 void 1548 xen_unplug_emulated(void *xsc, int what) 1549 { 1550 struct xen_softc *sc = xsc; 1551 1552 sc->sc_unplug |= what; 1553 } 1554