1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011 NetApp, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/module.h> 39 #include <sys/bus.h> 40 #include <sys/pciio.h> 41 #include <sys/rman.h> 42 #include <sys/smp.h> 43 #include <sys/sysctl.h> 44 45 #include <dev/pci/pcivar.h> 46 #include <dev/pci/pcireg.h> 47 48 #include <machine/resource.h> 49 50 #include <machine/vmm.h> 51 #include <machine/vmm_dev.h> 52 53 #include "vmm_lapic.h" 54 #include "vmm_ktr.h" 55 56 #include "iommu.h" 57 #include "ppt.h" 58 59 /* XXX locking */ 60 61 #define MAX_MSIMSGS 32 62 63 /* 64 * If the MSI-X table is located in the middle of a BAR then that MMIO 65 * region gets split into two segments - one segment above the MSI-X table 66 * and the other segment below the MSI-X table - with a hole in place of 67 * the MSI-X table so accesses to it can be trapped and emulated. 68 * 69 * So, allocate a MMIO segment for each BAR register + 1 additional segment. 70 */ 71 #define MAX_MMIOSEGS ((PCIR_MAX_BAR_0 + 1) + 1) 72 73 MALLOC_DEFINE(M_PPTMSIX, "pptmsix", "Passthru MSI-X resources"); 74 75 struct pptintr_arg { /* pptintr(pptintr_arg) */ 76 struct pptdev *pptdev; 77 uint64_t addr; 78 uint64_t msg_data; 79 }; 80 81 struct pptseg { 82 vm_paddr_t gpa; 83 size_t len; 84 int wired; 85 }; 86 87 struct pptdev { 88 device_t dev; 89 struct vm *vm; /* owner of this device */ 90 TAILQ_ENTRY(pptdev) next; 91 struct pptseg mmio[MAX_MMIOSEGS]; 92 struct { 93 int num_msgs; /* guest state */ 94 95 int startrid; /* host state */ 96 struct resource *res[MAX_MSIMSGS]; 97 void *cookie[MAX_MSIMSGS]; 98 struct pptintr_arg arg[MAX_MSIMSGS]; 99 } msi; 100 101 struct { 102 int num_msgs; 103 int startrid; 104 int msix_table_rid; 105 struct resource *msix_table_res; 106 struct resource **res; 107 void **cookie; 108 struct pptintr_arg *arg; 109 } msix; 110 }; 111 112 SYSCTL_DECL(_hw_vmm); 113 SYSCTL_NODE(_hw_vmm, OID_AUTO, ppt, CTLFLAG_RW, 0, "bhyve passthru devices"); 114 115 static int num_pptdevs; 116 SYSCTL_INT(_hw_vmm_ppt, OID_AUTO, devices, CTLFLAG_RD, &num_pptdevs, 0, 117 "number of pci passthru devices"); 118 119 static TAILQ_HEAD(, pptdev) pptdev_list = TAILQ_HEAD_INITIALIZER(pptdev_list); 120 121 static int 122 ppt_probe(device_t dev) 123 { 124 int bus, slot, func; 125 struct pci_devinfo *dinfo; 126 127 dinfo = (struct pci_devinfo *)device_get_ivars(dev); 128 129 bus = pci_get_bus(dev); 130 slot = pci_get_slot(dev); 131 func = pci_get_function(dev); 132 133 /* 134 * To qualify as a pci passthrough device a device must: 135 * - be allowed by administrator to be used in this role 136 * - be an endpoint device 137 */ 138 if ((dinfo->cfg.hdrtype & PCIM_HDRTYPE) != PCIM_HDRTYPE_NORMAL) 139 return (ENXIO); 140 else if (vmm_is_pptdev(bus, slot, func)) 141 return (0); 142 else 143 /* 144 * Returning BUS_PROBE_NOWILDCARD here matches devices that the 145 * SR-IOV infrastructure specified as "ppt" passthrough devices. 146 * All normal devices that did not have "ppt" specified as their 147 * driver will not be matched by this. 148 */ 149 return (BUS_PROBE_NOWILDCARD); 150 } 151 152 static int 153 ppt_attach(device_t dev) 154 { 155 struct pptdev *ppt; 156 157 ppt = device_get_softc(dev); 158 159 iommu_remove_device(iommu_host_domain(), pci_get_rid(dev)); 160 num_pptdevs++; 161 TAILQ_INSERT_TAIL(&pptdev_list, ppt, next); 162 ppt->dev = dev; 163 164 if (bootverbose) 165 device_printf(dev, "attached\n"); 166 167 return (0); 168 } 169 170 static int 171 ppt_detach(device_t dev) 172 { 173 struct pptdev *ppt; 174 175 ppt = device_get_softc(dev); 176 177 if (ppt->vm != NULL) 178 return (EBUSY); 179 num_pptdevs--; 180 TAILQ_REMOVE(&pptdev_list, ppt, next); 181 pci_disable_busmaster(dev); 182 iommu_add_device(iommu_host_domain(), pci_get_rid(dev)); 183 184 return (0); 185 } 186 187 static device_method_t ppt_methods[] = { 188 /* Device interface */ 189 DEVMETHOD(device_probe, ppt_probe), 190 DEVMETHOD(device_attach, ppt_attach), 191 DEVMETHOD(device_detach, ppt_detach), 192 {0, 0} 193 }; 194 195 static devclass_t ppt_devclass; 196 DEFINE_CLASS_0(ppt, ppt_driver, ppt_methods, sizeof(struct pptdev)); 197 DRIVER_MODULE(ppt, pci, ppt_driver, ppt_devclass, NULL, NULL); 198 199 static struct pptdev * 200 ppt_find(int bus, int slot, int func) 201 { 202 device_t dev; 203 struct pptdev *ppt; 204 int b, s, f; 205 206 TAILQ_FOREACH(ppt, &pptdev_list, next) { 207 dev = ppt->dev; 208 b = pci_get_bus(dev); 209 s = pci_get_slot(dev); 210 f = pci_get_function(dev); 211 if (bus == b && slot == s && func == f) 212 return (ppt); 213 } 214 return (NULL); 215 } 216 217 static void 218 ppt_unmap_mmio(struct vm *vm, struct pptdev *ppt) 219 { 220 int i; 221 struct pptseg *seg; 222 223 for (i = 0; i < MAX_MMIOSEGS; i++) { 224 seg = &ppt->mmio[i]; 225 if (seg->len == 0) 226 continue; 227 (void)vm_unmap_mmio(vm, seg->gpa, seg->len); 228 bzero(seg, sizeof(struct pptseg)); 229 } 230 } 231 232 static void 233 ppt_teardown_msi(struct pptdev *ppt) 234 { 235 int i, rid; 236 void *cookie; 237 struct resource *res; 238 239 if (ppt->msi.num_msgs == 0) 240 return; 241 242 for (i = 0; i < ppt->msi.num_msgs; i++) { 243 rid = ppt->msi.startrid + i; 244 res = ppt->msi.res[i]; 245 cookie = ppt->msi.cookie[i]; 246 247 if (cookie != NULL) 248 bus_teardown_intr(ppt->dev, res, cookie); 249 250 if (res != NULL) 251 bus_release_resource(ppt->dev, SYS_RES_IRQ, rid, res); 252 253 ppt->msi.res[i] = NULL; 254 ppt->msi.cookie[i] = NULL; 255 } 256 257 if (ppt->msi.startrid == 1) 258 pci_release_msi(ppt->dev); 259 260 ppt->msi.num_msgs = 0; 261 } 262 263 static void 264 ppt_teardown_msix_intr(struct pptdev *ppt, int idx) 265 { 266 int rid; 267 struct resource *res; 268 void *cookie; 269 270 rid = ppt->msix.startrid + idx; 271 res = ppt->msix.res[idx]; 272 cookie = ppt->msix.cookie[idx]; 273 274 if (cookie != NULL) 275 bus_teardown_intr(ppt->dev, res, cookie); 276 277 if (res != NULL) 278 bus_release_resource(ppt->dev, SYS_RES_IRQ, rid, res); 279 280 ppt->msix.res[idx] = NULL; 281 ppt->msix.cookie[idx] = NULL; 282 } 283 284 static void 285 ppt_teardown_msix(struct pptdev *ppt) 286 { 287 int i; 288 289 if (ppt->msix.num_msgs == 0) 290 return; 291 292 for (i = 0; i < ppt->msix.num_msgs; i++) 293 ppt_teardown_msix_intr(ppt, i); 294 295 if (ppt->msix.msix_table_res) { 296 bus_release_resource(ppt->dev, SYS_RES_MEMORY, 297 ppt->msix.msix_table_rid, 298 ppt->msix.msix_table_res); 299 ppt->msix.msix_table_res = NULL; 300 ppt->msix.msix_table_rid = 0; 301 } 302 303 free(ppt->msix.res, M_PPTMSIX); 304 free(ppt->msix.cookie, M_PPTMSIX); 305 free(ppt->msix.arg, M_PPTMSIX); 306 307 pci_release_msi(ppt->dev); 308 309 ppt->msix.num_msgs = 0; 310 } 311 312 int 313 ppt_avail_devices(void) 314 { 315 316 return (num_pptdevs); 317 } 318 319 int 320 ppt_assigned_devices(struct vm *vm) 321 { 322 struct pptdev *ppt; 323 int num; 324 325 num = 0; 326 TAILQ_FOREACH(ppt, &pptdev_list, next) { 327 if (ppt->vm == vm) 328 num++; 329 } 330 return (num); 331 } 332 333 boolean_t 334 ppt_is_mmio(struct vm *vm, vm_paddr_t gpa) 335 { 336 int i; 337 struct pptdev *ppt; 338 struct pptseg *seg; 339 340 TAILQ_FOREACH(ppt, &pptdev_list, next) { 341 if (ppt->vm != vm) 342 continue; 343 344 for (i = 0; i < MAX_MMIOSEGS; i++) { 345 seg = &ppt->mmio[i]; 346 if (seg->len == 0) 347 continue; 348 if (gpa >= seg->gpa && gpa < seg->gpa + seg->len) 349 return (TRUE); 350 } 351 } 352 353 return (FALSE); 354 } 355 356 static void 357 ppt_pci_reset(device_t dev) 358 { 359 360 if (pcie_flr(dev, 361 max(pcie_get_max_completion_timeout(dev) / 1000, 10), true)) 362 return; 363 364 pci_power_reset(dev); 365 } 366 367 int 368 ppt_assign_device(struct vm *vm, int bus, int slot, int func) 369 { 370 struct pptdev *ppt; 371 372 ppt = ppt_find(bus, slot, func); 373 if (ppt != NULL) { 374 /* 375 * If this device is owned by a different VM then we 376 * cannot change its owner. 377 */ 378 if (ppt->vm != NULL && ppt->vm != vm) 379 return (EBUSY); 380 381 pci_save_state(ppt->dev); 382 ppt_pci_reset(ppt->dev); 383 pci_restore_state(ppt->dev); 384 ppt->vm = vm; 385 iommu_add_device(vm_iommu_domain(vm), pci_get_rid(ppt->dev)); 386 return (0); 387 } 388 return (ENOENT); 389 } 390 391 int 392 ppt_unassign_device(struct vm *vm, int bus, int slot, int func) 393 { 394 struct pptdev *ppt; 395 396 ppt = ppt_find(bus, slot, func); 397 if (ppt != NULL) { 398 /* 399 * If this device is not owned by this 'vm' then bail out. 400 */ 401 if (ppt->vm != vm) 402 return (EBUSY); 403 404 pci_save_state(ppt->dev); 405 ppt_pci_reset(ppt->dev); 406 pci_restore_state(ppt->dev); 407 ppt_unmap_mmio(vm, ppt); 408 ppt_teardown_msi(ppt); 409 ppt_teardown_msix(ppt); 410 iommu_remove_device(vm_iommu_domain(vm), pci_get_rid(ppt->dev)); 411 ppt->vm = NULL; 412 return (0); 413 } 414 return (ENOENT); 415 } 416 417 int 418 ppt_unassign_all(struct vm *vm) 419 { 420 struct pptdev *ppt; 421 int bus, slot, func; 422 device_t dev; 423 424 TAILQ_FOREACH(ppt, &pptdev_list, next) { 425 if (ppt->vm == vm) { 426 dev = ppt->dev; 427 bus = pci_get_bus(dev); 428 slot = pci_get_slot(dev); 429 func = pci_get_function(dev); 430 vm_unassign_pptdev(vm, bus, slot, func); 431 } 432 } 433 434 return (0); 435 } 436 437 int 438 ppt_map_mmio(struct vm *vm, int bus, int slot, int func, 439 vm_paddr_t gpa, size_t len, vm_paddr_t hpa) 440 { 441 int i, error; 442 struct pptseg *seg; 443 struct pptdev *ppt; 444 445 ppt = ppt_find(bus, slot, func); 446 if (ppt != NULL) { 447 if (ppt->vm != vm) 448 return (EBUSY); 449 450 for (i = 0; i < MAX_MMIOSEGS; i++) { 451 seg = &ppt->mmio[i]; 452 if (seg->len == 0) { 453 error = vm_map_mmio(vm, gpa, len, hpa); 454 if (error == 0) { 455 seg->gpa = gpa; 456 seg->len = len; 457 } 458 return (error); 459 } 460 } 461 return (ENOSPC); 462 } 463 return (ENOENT); 464 } 465 466 static int 467 pptintr(void *arg) 468 { 469 struct pptdev *ppt; 470 struct pptintr_arg *pptarg; 471 472 pptarg = arg; 473 ppt = pptarg->pptdev; 474 475 if (ppt->vm != NULL) 476 lapic_intr_msi(ppt->vm, pptarg->addr, pptarg->msg_data); 477 else { 478 /* 479 * XXX 480 * This is not expected to happen - panic? 481 */ 482 } 483 484 /* 485 * For legacy interrupts give other filters a chance in case 486 * the interrupt was not generated by the passthrough device. 487 */ 488 if (ppt->msi.startrid == 0) 489 return (FILTER_STRAY); 490 else 491 return (FILTER_HANDLED); 492 } 493 494 int 495 ppt_setup_msi(struct vm *vm, int vcpu, int bus, int slot, int func, 496 uint64_t addr, uint64_t msg, int numvec) 497 { 498 int i, rid, flags; 499 int msi_count, startrid, error, tmp; 500 struct pptdev *ppt; 501 502 if (numvec < 0 || numvec > MAX_MSIMSGS) 503 return (EINVAL); 504 505 ppt = ppt_find(bus, slot, func); 506 if (ppt == NULL) 507 return (ENOENT); 508 if (ppt->vm != vm) /* Make sure we own this device */ 509 return (EBUSY); 510 511 /* Free any allocated resources */ 512 ppt_teardown_msi(ppt); 513 514 if (numvec == 0) /* nothing more to do */ 515 return (0); 516 517 flags = RF_ACTIVE; 518 msi_count = pci_msi_count(ppt->dev); 519 if (msi_count == 0) { 520 startrid = 0; /* legacy interrupt */ 521 msi_count = 1; 522 flags |= RF_SHAREABLE; 523 } else 524 startrid = 1; /* MSI */ 525 526 /* 527 * The device must be capable of supporting the number of vectors 528 * the guest wants to allocate. 529 */ 530 if (numvec > msi_count) 531 return (EINVAL); 532 533 /* 534 * Make sure that we can allocate all the MSI vectors that are needed 535 * by the guest. 536 */ 537 if (startrid == 1) { 538 tmp = numvec; 539 error = pci_alloc_msi(ppt->dev, &tmp); 540 if (error) 541 return (error); 542 else if (tmp != numvec) { 543 pci_release_msi(ppt->dev); 544 return (ENOSPC); 545 } else { 546 /* success */ 547 } 548 } 549 550 ppt->msi.startrid = startrid; 551 552 /* 553 * Allocate the irq resource and attach it to the interrupt handler. 554 */ 555 for (i = 0; i < numvec; i++) { 556 ppt->msi.num_msgs = i + 1; 557 ppt->msi.cookie[i] = NULL; 558 559 rid = startrid + i; 560 ppt->msi.res[i] = bus_alloc_resource_any(ppt->dev, SYS_RES_IRQ, 561 &rid, flags); 562 if (ppt->msi.res[i] == NULL) 563 break; 564 565 ppt->msi.arg[i].pptdev = ppt; 566 ppt->msi.arg[i].addr = addr; 567 ppt->msi.arg[i].msg_data = msg + i; 568 569 error = bus_setup_intr(ppt->dev, ppt->msi.res[i], 570 INTR_TYPE_NET | INTR_MPSAFE, 571 pptintr, NULL, &ppt->msi.arg[i], 572 &ppt->msi.cookie[i]); 573 if (error != 0) 574 break; 575 } 576 577 if (i < numvec) { 578 ppt_teardown_msi(ppt); 579 return (ENXIO); 580 } 581 582 return (0); 583 } 584 585 int 586 ppt_setup_msix(struct vm *vm, int vcpu, int bus, int slot, int func, 587 int idx, uint64_t addr, uint64_t msg, uint32_t vector_control) 588 { 589 struct pptdev *ppt; 590 struct pci_devinfo *dinfo; 591 int numvec, alloced, rid, error; 592 size_t res_size, cookie_size, arg_size; 593 594 ppt = ppt_find(bus, slot, func); 595 if (ppt == NULL) 596 return (ENOENT); 597 if (ppt->vm != vm) /* Make sure we own this device */ 598 return (EBUSY); 599 600 dinfo = device_get_ivars(ppt->dev); 601 if (!dinfo) 602 return (ENXIO); 603 604 /* 605 * First-time configuration: 606 * Allocate the MSI-X table 607 * Allocate the IRQ resources 608 * Set up some variables in ppt->msix 609 */ 610 if (ppt->msix.num_msgs == 0) { 611 numvec = pci_msix_count(ppt->dev); 612 if (numvec <= 0) 613 return (EINVAL); 614 615 ppt->msix.startrid = 1; 616 ppt->msix.num_msgs = numvec; 617 618 res_size = numvec * sizeof(ppt->msix.res[0]); 619 cookie_size = numvec * sizeof(ppt->msix.cookie[0]); 620 arg_size = numvec * sizeof(ppt->msix.arg[0]); 621 622 ppt->msix.res = malloc(res_size, M_PPTMSIX, M_WAITOK | M_ZERO); 623 ppt->msix.cookie = malloc(cookie_size, M_PPTMSIX, 624 M_WAITOK | M_ZERO); 625 ppt->msix.arg = malloc(arg_size, M_PPTMSIX, M_WAITOK | M_ZERO); 626 627 rid = dinfo->cfg.msix.msix_table_bar; 628 ppt->msix.msix_table_res = bus_alloc_resource_any(ppt->dev, 629 SYS_RES_MEMORY, &rid, RF_ACTIVE); 630 631 if (ppt->msix.msix_table_res == NULL) { 632 ppt_teardown_msix(ppt); 633 return (ENOSPC); 634 } 635 ppt->msix.msix_table_rid = rid; 636 637 alloced = numvec; 638 error = pci_alloc_msix(ppt->dev, &alloced); 639 if (error || alloced != numvec) { 640 ppt_teardown_msix(ppt); 641 return (error == 0 ? ENOSPC: error); 642 } 643 } 644 645 if ((vector_control & PCIM_MSIX_VCTRL_MASK) == 0) { 646 /* Tear down the IRQ if it's already set up */ 647 ppt_teardown_msix_intr(ppt, idx); 648 649 /* Allocate the IRQ resource */ 650 ppt->msix.cookie[idx] = NULL; 651 rid = ppt->msix.startrid + idx; 652 ppt->msix.res[idx] = bus_alloc_resource_any(ppt->dev, SYS_RES_IRQ, 653 &rid, RF_ACTIVE); 654 if (ppt->msix.res[idx] == NULL) 655 return (ENXIO); 656 657 ppt->msix.arg[idx].pptdev = ppt; 658 ppt->msix.arg[idx].addr = addr; 659 ppt->msix.arg[idx].msg_data = msg; 660 661 /* Setup the MSI-X interrupt */ 662 error = bus_setup_intr(ppt->dev, ppt->msix.res[idx], 663 INTR_TYPE_NET | INTR_MPSAFE, 664 pptintr, NULL, &ppt->msix.arg[idx], 665 &ppt->msix.cookie[idx]); 666 667 if (error != 0) { 668 bus_teardown_intr(ppt->dev, ppt->msix.res[idx], ppt->msix.cookie[idx]); 669 bus_release_resource(ppt->dev, SYS_RES_IRQ, rid, ppt->msix.res[idx]); 670 ppt->msix.cookie[idx] = NULL; 671 ppt->msix.res[idx] = NULL; 672 return (ENXIO); 673 } 674 } else { 675 /* Masked, tear it down if it's already been set up */ 676 ppt_teardown_msix_intr(ppt, idx); 677 } 678 679 return (0); 680 } 681