ppt.c revision 284539
1/*- 2 * Copyright (c) 2011 NetApp, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/sys/amd64/vmm/io/ppt.c 284539 2015-06-18 06:00:17Z neel $ 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD: head/sys/amd64/vmm/io/ppt.c 284539 2015-06-18 06:00:17Z neel $"); 31 32#include <sys/param.h> 33#include <sys/systm.h> 34#include <sys/kernel.h> 35#include <sys/malloc.h> 36#include <sys/module.h> 37#include <sys/bus.h> 38#include <sys/pciio.h> 39#include <sys/rman.h> 40#include <sys/smp.h> 41#include <sys/sysctl.h> 42 43#include <dev/pci/pcivar.h> 44#include <dev/pci/pcireg.h> 45 46#include <machine/resource.h> 47 48#include <machine/vmm.h> 49#include <machine/vmm_dev.h> 50 51#include "vmm_lapic.h" 52#include "vmm_ktr.h" 53 54#include "iommu.h" 55#include "ppt.h" 56 57/* XXX locking */ 58 59#define MAX_MSIMSGS 32 60 61/* 62 * If the MSI-X table is located in the middle of a BAR then that MMIO 63 * region gets split into two segments - one segment above the MSI-X table 64 * and the other segment below the MSI-X table - with a hole in place of 65 * the MSI-X table so accesses to it can be trapped and emulated. 66 * 67 * So, allocate a MMIO segment for each BAR register + 1 additional segment. 68 */ 69#define MAX_MMIOSEGS ((PCIR_MAX_BAR_0 + 1) + 1) 70 71MALLOC_DEFINE(M_PPTMSIX, "pptmsix", "Passthru MSI-X resources"); 72 73struct pptintr_arg { /* pptintr(pptintr_arg) */ 74 struct pptdev *pptdev; 75 uint64_t addr; 76 uint64_t msg_data; 77}; 78 79struct pptseg { 80 vm_paddr_t gpa; 81 size_t len; 82 int wired; 83}; 84 85struct pptdev { 86 device_t dev; 87 struct vm *vm; /* owner of this device */ 88 TAILQ_ENTRY(pptdev) next; 89 struct pptseg mmio[MAX_MMIOSEGS]; 90 struct { 91 int num_msgs; /* guest state */ 92 93 int startrid; /* host state */ 94 struct resource *res[MAX_MSIMSGS]; 95 void *cookie[MAX_MSIMSGS]; 96 struct pptintr_arg arg[MAX_MSIMSGS]; 97 } msi; 98 99 struct { 100 int num_msgs; 101 int startrid; 102 int msix_table_rid; 103 struct resource *msix_table_res; 104 struct resource **res; 105 void **cookie; 106 struct pptintr_arg *arg; 107 } msix; 108}; 109 110SYSCTL_DECL(_hw_vmm); 111SYSCTL_NODE(_hw_vmm, OID_AUTO, ppt, CTLFLAG_RW, 0, "bhyve passthru devices"); 112 113static int num_pptdevs; 114SYSCTL_INT(_hw_vmm_ppt, OID_AUTO, devices, CTLFLAG_RD, &num_pptdevs, 0, 115 "number of pci passthru devices"); 116 117static TAILQ_HEAD(, pptdev) pptdev_list = TAILQ_HEAD_INITIALIZER(pptdev_list); 118 119static int 120ppt_probe(device_t dev) 121{ 122 int bus, slot, func; 123 struct pci_devinfo *dinfo; 124 125 dinfo = (struct pci_devinfo *)device_get_ivars(dev); 126 127 bus = pci_get_bus(dev); 128 slot = pci_get_slot(dev); 129 func = pci_get_function(dev); 130 131 /* 132 * To qualify as a pci passthrough device a device must: 133 * - be allowed by administrator to be used in this role 134 * - be an endpoint device 135 */ 136 if ((dinfo->cfg.hdrtype & PCIM_HDRTYPE) != PCIM_HDRTYPE_NORMAL) 137 return (ENXIO); 138 else if (vmm_is_pptdev(bus, slot, func)) 139 return (0); 140 else 141 /* 142 * Returning BUS_PROBE_NOWILDCARD here matches devices that the 143 * SR-IOV infrastructure specified as "ppt" passthrough devices. 144 * All normal devices that did not have "ppt" specified as their 145 * driver will not be matched by this. 146 */ 147 return (BUS_PROBE_NOWILDCARD); 148} 149 150static int 151ppt_attach(device_t dev) 152{ 153 struct pptdev *ppt; 154 155 ppt = device_get_softc(dev); 156 157 num_pptdevs++; 158 TAILQ_INSERT_TAIL(&pptdev_list, ppt, next); 159 ppt->dev = dev; 160 161 if (bootverbose) 162 device_printf(dev, "attached\n"); 163 164 return (0); 165} 166 167static int 168ppt_detach(device_t dev) 169{ 170 struct pptdev *ppt; 171 172 ppt = device_get_softc(dev); 173 174 if (ppt->vm != NULL) 175 return (EBUSY); 176 num_pptdevs--; 177 TAILQ_REMOVE(&pptdev_list, ppt, next); 178 179 return (0); 180} 181 182static device_method_t ppt_methods[] = { 183 /* Device interface */ 184 DEVMETHOD(device_probe, ppt_probe), 185 DEVMETHOD(device_attach, ppt_attach), 186 DEVMETHOD(device_detach, ppt_detach), 187 {0, 0} 188}; 189 190static devclass_t ppt_devclass; 191DEFINE_CLASS_0(ppt, ppt_driver, ppt_methods, sizeof(struct pptdev)); 192DRIVER_MODULE(ppt, pci, ppt_driver, ppt_devclass, NULL, NULL); 193 194static struct pptdev * 195ppt_find(int bus, int slot, int func) 196{ 197 device_t dev; 198 struct pptdev *ppt; 199 int b, s, f; 200 201 TAILQ_FOREACH(ppt, &pptdev_list, next) { 202 dev = ppt->dev; 203 b = pci_get_bus(dev); 204 s = pci_get_slot(dev); 205 f = pci_get_function(dev); 206 if (bus == b && slot == s && func == f) 207 return (ppt); 208 } 209 return (NULL); 210} 211 212static void 213ppt_unmap_mmio(struct vm *vm, struct pptdev *ppt) 214{ 215 int i; 216 struct pptseg *seg; 217 218 for (i = 0; i < MAX_MMIOSEGS; i++) { 219 seg = &ppt->mmio[i]; 220 if (seg->len == 0) 221 continue; 222 (void)vm_unmap_mmio(vm, seg->gpa, seg->len); 223 bzero(seg, sizeof(struct pptseg)); 224 } 225} 226 227static void 228ppt_teardown_msi(struct pptdev *ppt) 229{ 230 int i, rid; 231 void *cookie; 232 struct resource *res; 233 234 if (ppt->msi.num_msgs == 0) 235 return; 236 237 for (i = 0; i < ppt->msi.num_msgs; i++) { 238 rid = ppt->msi.startrid + i; 239 res = ppt->msi.res[i]; 240 cookie = ppt->msi.cookie[i]; 241 242 if (cookie != NULL) 243 bus_teardown_intr(ppt->dev, res, cookie); 244 245 if (res != NULL) 246 bus_release_resource(ppt->dev, SYS_RES_IRQ, rid, res); 247 248 ppt->msi.res[i] = NULL; 249 ppt->msi.cookie[i] = NULL; 250 } 251 252 if (ppt->msi.startrid == 1) 253 pci_release_msi(ppt->dev); 254 255 ppt->msi.num_msgs = 0; 256} 257 258static void 259ppt_teardown_msix_intr(struct pptdev *ppt, int idx) 260{ 261 int rid; 262 struct resource *res; 263 void *cookie; 264 265 rid = ppt->msix.startrid + idx; 266 res = ppt->msix.res[idx]; 267 cookie = ppt->msix.cookie[idx]; 268 269 if (cookie != NULL) 270 bus_teardown_intr(ppt->dev, res, cookie); 271 272 if (res != NULL) 273 bus_release_resource(ppt->dev, SYS_RES_IRQ, rid, res); 274 275 ppt->msix.res[idx] = NULL; 276 ppt->msix.cookie[idx] = NULL; 277} 278 279static void 280ppt_teardown_msix(struct pptdev *ppt) 281{ 282 int i; 283 284 if (ppt->msix.num_msgs == 0) 285 return; 286 287 for (i = 0; i < ppt->msix.num_msgs; i++) 288 ppt_teardown_msix_intr(ppt, i); 289 290 if (ppt->msix.msix_table_res) { 291 bus_release_resource(ppt->dev, SYS_RES_MEMORY, 292 ppt->msix.msix_table_rid, 293 ppt->msix.msix_table_res); 294 ppt->msix.msix_table_res = NULL; 295 ppt->msix.msix_table_rid = 0; 296 } 297 298 free(ppt->msix.res, M_PPTMSIX); 299 free(ppt->msix.cookie, M_PPTMSIX); 300 free(ppt->msix.arg, M_PPTMSIX); 301 302 pci_release_msi(ppt->dev); 303 304 ppt->msix.num_msgs = 0; 305} 306 307int 308ppt_avail_devices(void) 309{ 310 311 return (num_pptdevs); 312} 313 314int 315ppt_assigned_devices(struct vm *vm) 316{ 317 struct pptdev *ppt; 318 int num; 319 320 num = 0; 321 TAILQ_FOREACH(ppt, &pptdev_list, next) { 322 if (ppt->vm == vm) 323 num++; 324 } 325 return (num); 326} 327 328boolean_t 329ppt_is_mmio(struct vm *vm, vm_paddr_t gpa) 330{ 331 int i; 332 struct pptdev *ppt; 333 struct pptseg *seg; 334 335 TAILQ_FOREACH(ppt, &pptdev_list, next) { 336 if (ppt->vm != vm) 337 continue; 338 339 for (i = 0; i < MAX_MMIOSEGS; i++) { 340 seg = &ppt->mmio[i]; 341 if (seg->len == 0) 342 continue; 343 if (gpa >= seg->gpa && gpa < seg->gpa + seg->len) 344 return (TRUE); 345 } 346 } 347 348 return (FALSE); 349} 350 351int 352ppt_assign_device(struct vm *vm, int bus, int slot, int func) 353{ 354 struct pptdev *ppt; 355 356 ppt = ppt_find(bus, slot, func); 357 if (ppt != NULL) { 358 /* 359 * If this device is owned by a different VM then we 360 * cannot change its owner. 361 */ 362 if (ppt->vm != NULL && ppt->vm != vm) 363 return (EBUSY); 364 365 ppt->vm = vm; 366 iommu_add_device(vm_iommu_domain(vm), pci_get_rid(ppt->dev)); 367 return (0); 368 } 369 return (ENOENT); 370} 371 372int 373ppt_unassign_device(struct vm *vm, int bus, int slot, int func) 374{ 375 struct pptdev *ppt; 376 377 ppt = ppt_find(bus, slot, func); 378 if (ppt != NULL) { 379 /* 380 * If this device is not owned by this 'vm' then bail out. 381 */ 382 if (ppt->vm != vm) 383 return (EBUSY); 384 ppt_unmap_mmio(vm, ppt); 385 ppt_teardown_msi(ppt); 386 ppt_teardown_msix(ppt); 387 iommu_remove_device(vm_iommu_domain(vm), pci_get_rid(ppt->dev)); 388 ppt->vm = NULL; 389 return (0); 390 } 391 return (ENOENT); 392} 393 394int 395ppt_unassign_all(struct vm *vm) 396{ 397 struct pptdev *ppt; 398 int bus, slot, func; 399 device_t dev; 400 401 TAILQ_FOREACH(ppt, &pptdev_list, next) { 402 if (ppt->vm == vm) { 403 dev = ppt->dev; 404 bus = pci_get_bus(dev); 405 slot = pci_get_slot(dev); 406 func = pci_get_function(dev); 407 vm_unassign_pptdev(vm, bus, slot, func); 408 } 409 } 410 411 return (0); 412} 413 414int 415ppt_map_mmio(struct vm *vm, int bus, int slot, int func, 416 vm_paddr_t gpa, size_t len, vm_paddr_t hpa) 417{ 418 int i, error; 419 struct pptseg *seg; 420 struct pptdev *ppt; 421 422 ppt = ppt_find(bus, slot, func); 423 if (ppt != NULL) { 424 if (ppt->vm != vm) 425 return (EBUSY); 426 427 for (i = 0; i < MAX_MMIOSEGS; i++) { 428 seg = &ppt->mmio[i]; 429 if (seg->len == 0) { 430 error = vm_map_mmio(vm, gpa, len, hpa); 431 if (error == 0) { 432 seg->gpa = gpa; 433 seg->len = len; 434 } 435 return (error); 436 } 437 } 438 return (ENOSPC); 439 } 440 return (ENOENT); 441} 442 443static int 444pptintr(void *arg) 445{ 446 struct pptdev *ppt; 447 struct pptintr_arg *pptarg; 448 449 pptarg = arg; 450 ppt = pptarg->pptdev; 451 452 if (ppt->vm != NULL) 453 lapic_intr_msi(ppt->vm, pptarg->addr, pptarg->msg_data); 454 else { 455 /* 456 * XXX 457 * This is not expected to happen - panic? 458 */ 459 } 460 461 /* 462 * For legacy interrupts give other filters a chance in case 463 * the interrupt was not generated by the passthrough device. 464 */ 465 if (ppt->msi.startrid == 0) 466 return (FILTER_STRAY); 467 else 468 return (FILTER_HANDLED); 469} 470 471int 472ppt_setup_msi(struct vm *vm, int vcpu, int bus, int slot, int func, 473 uint64_t addr, uint64_t msg, int numvec) 474{ 475 int i, rid, flags; 476 int msi_count, startrid, error, tmp; 477 struct pptdev *ppt; 478 479 if (numvec < 0 || numvec > MAX_MSIMSGS) 480 return (EINVAL); 481 482 ppt = ppt_find(bus, slot, func); 483 if (ppt == NULL) 484 return (ENOENT); 485 if (ppt->vm != vm) /* Make sure we own this device */ 486 return (EBUSY); 487 488 /* Free any allocated resources */ 489 ppt_teardown_msi(ppt); 490 491 if (numvec == 0) /* nothing more to do */ 492 return (0); 493 494 flags = RF_ACTIVE; 495 msi_count = pci_msi_count(ppt->dev); 496 if (msi_count == 0) { 497 startrid = 0; /* legacy interrupt */ 498 msi_count = 1; 499 flags |= RF_SHAREABLE; 500 } else 501 startrid = 1; /* MSI */ 502 503 /* 504 * The device must be capable of supporting the number of vectors 505 * the guest wants to allocate. 506 */ 507 if (numvec > msi_count) 508 return (EINVAL); 509 510 /* 511 * Make sure that we can allocate all the MSI vectors that are needed 512 * by the guest. 513 */ 514 if (startrid == 1) { 515 tmp = numvec; 516 error = pci_alloc_msi(ppt->dev, &tmp); 517 if (error) 518 return (error); 519 else if (tmp != numvec) { 520 pci_release_msi(ppt->dev); 521 return (ENOSPC); 522 } else { 523 /* success */ 524 } 525 } 526 527 ppt->msi.startrid = startrid; 528 529 /* 530 * Allocate the irq resource and attach it to the interrupt handler. 531 */ 532 for (i = 0; i < numvec; i++) { 533 ppt->msi.num_msgs = i + 1; 534 ppt->msi.cookie[i] = NULL; 535 536 rid = startrid + i; 537 ppt->msi.res[i] = bus_alloc_resource_any(ppt->dev, SYS_RES_IRQ, 538 &rid, flags); 539 if (ppt->msi.res[i] == NULL) 540 break; 541 542 ppt->msi.arg[i].pptdev = ppt; 543 ppt->msi.arg[i].addr = addr; 544 ppt->msi.arg[i].msg_data = msg + i; 545 546 error = bus_setup_intr(ppt->dev, ppt->msi.res[i], 547 INTR_TYPE_NET | INTR_MPSAFE, 548 pptintr, NULL, &ppt->msi.arg[i], 549 &ppt->msi.cookie[i]); 550 if (error != 0) 551 break; 552 } 553 554 if (i < numvec) { 555 ppt_teardown_msi(ppt); 556 return (ENXIO); 557 } 558 559 return (0); 560} 561 562int 563ppt_setup_msix(struct vm *vm, int vcpu, int bus, int slot, int func, 564 int idx, uint64_t addr, uint64_t msg, uint32_t vector_control) 565{ 566 struct pptdev *ppt; 567 struct pci_devinfo *dinfo; 568 int numvec, alloced, rid, error; 569 size_t res_size, cookie_size, arg_size; 570 571 ppt = ppt_find(bus, slot, func); 572 if (ppt == NULL) 573 return (ENOENT); 574 if (ppt->vm != vm) /* Make sure we own this device */ 575 return (EBUSY); 576 577 dinfo = device_get_ivars(ppt->dev); 578 if (!dinfo) 579 return (ENXIO); 580 581 /* 582 * First-time configuration: 583 * Allocate the MSI-X table 584 * Allocate the IRQ resources 585 * Set up some variables in ppt->msix 586 */ 587 if (ppt->msix.num_msgs == 0) { 588 numvec = pci_msix_count(ppt->dev); 589 if (numvec <= 0) 590 return (EINVAL); 591 592 ppt->msix.startrid = 1; 593 ppt->msix.num_msgs = numvec; 594 595 res_size = numvec * sizeof(ppt->msix.res[0]); 596 cookie_size = numvec * sizeof(ppt->msix.cookie[0]); 597 arg_size = numvec * sizeof(ppt->msix.arg[0]); 598 599 ppt->msix.res = malloc(res_size, M_PPTMSIX, M_WAITOK | M_ZERO); 600 ppt->msix.cookie = malloc(cookie_size, M_PPTMSIX, 601 M_WAITOK | M_ZERO); 602 ppt->msix.arg = malloc(arg_size, M_PPTMSIX, M_WAITOK | M_ZERO); 603 604 rid = dinfo->cfg.msix.msix_table_bar; 605 ppt->msix.msix_table_res = bus_alloc_resource_any(ppt->dev, 606 SYS_RES_MEMORY, &rid, RF_ACTIVE); 607 608 if (ppt->msix.msix_table_res == NULL) { 609 ppt_teardown_msix(ppt); 610 return (ENOSPC); 611 } 612 ppt->msix.msix_table_rid = rid; 613 614 alloced = numvec; 615 error = pci_alloc_msix(ppt->dev, &alloced); 616 if (error || alloced != numvec) { 617 ppt_teardown_msix(ppt); 618 return (error == 0 ? ENOSPC: error); 619 } 620 } 621 622 if ((vector_control & PCIM_MSIX_VCTRL_MASK) == 0) { 623 /* Tear down the IRQ if it's already set up */ 624 ppt_teardown_msix_intr(ppt, idx); 625 626 /* Allocate the IRQ resource */ 627 ppt->msix.cookie[idx] = NULL; 628 rid = ppt->msix.startrid + idx; 629 ppt->msix.res[idx] = bus_alloc_resource_any(ppt->dev, SYS_RES_IRQ, 630 &rid, RF_ACTIVE); 631 if (ppt->msix.res[idx] == NULL) 632 return (ENXIO); 633 634 ppt->msix.arg[idx].pptdev = ppt; 635 ppt->msix.arg[idx].addr = addr; 636 ppt->msix.arg[idx].msg_data = msg; 637 638 /* Setup the MSI-X interrupt */ 639 error = bus_setup_intr(ppt->dev, ppt->msix.res[idx], 640 INTR_TYPE_NET | INTR_MPSAFE, 641 pptintr, NULL, &ppt->msix.arg[idx], 642 &ppt->msix.cookie[idx]); 643 644 if (error != 0) { 645 bus_teardown_intr(ppt->dev, ppt->msix.res[idx], ppt->msix.cookie[idx]); 646 bus_release_resource(ppt->dev, SYS_RES_IRQ, rid, ppt->msix.res[idx]); 647 ppt->msix.cookie[idx] = NULL; 648 ppt->msix.res[idx] = NULL; 649 return (ENXIO); 650 } 651 } else { 652 /* Masked, tear it down if it's already been set up */ 653 ppt_teardown_msix_intr(ppt, idx); 654 } 655 656 return (0); 657} 658