virtio_pci.c revision 1.53
1 /* $NetBSD: virtio_pci.c,v 1.53 2024/06/25 14:55:09 riastradh Exp $ */ 2 3 /* 4 * Copyright (c) 2020 The NetBSD Foundation, Inc. 5 * Copyright (c) 2012 Stefan Fritsch. 6 * Copyright (c) 2010 Minoura Makoto. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: virtio_pci.c,v 1.53 2024/06/25 14:55:09 riastradh Exp $"); 32 33 #include <sys/param.h> 34 #include <sys/types.h> 35 36 #include <sys/device.h> 37 #include <sys/endian.h> 38 #include <sys/interrupt.h> 39 #include <sys/kmem.h> 40 #include <sys/module.h> 41 #include <sys/syslog.h> 42 #include <sys/systm.h> 43 44 #include <dev/pci/pcidevs.h> 45 #include <dev/pci/pcireg.h> 46 #include <dev/pci/pcivar.h> 47 48 #include <dev/pci/virtioreg.h> /* XXX: move to non-pci */ 49 #include <dev/pci/virtio_pcireg.h> 50 51 #define VIRTIO_PRIVATE 52 #include <dev/pci/virtiovar.h> /* XXX: move to non-pci */ 53 54 #if defined(__alpha__) || defined(__sparc64__) 55 /* 56 * XXX VIRTIO_F_ACCESS_PLATFORM is required for standard PCI DMA 57 * XXX to work on these platforms, at least by Qemu. 58 * XXX 59 * XXX Generalize this later. 60 */ 61 #define __NEED_VIRTIO_F_ACCESS_PLATFORM 62 #endif /* __alpha__ || __sparc64__ */ 63 64 #define VIRTIO_PCI_LOG(_sc, _use_log, _fmt, _args...) \ 65 do { \ 66 if ((_use_log)) { \ 67 log(LOG_DEBUG, "%s: " _fmt, \ 68 device_xname((_sc)->sc_dev), \ 69 ##_args); \ 70 } else { \ 71 aprint_error_dev((_sc)->sc_dev, \ 72 _fmt, ##_args); \ 73 } \ 74 } while(0) 75 76 static int virtio_pci_match(device_t, cfdata_t, void *); 77 static void virtio_pci_attach(device_t, device_t, void *); 78 static int virtio_pci_rescan(device_t, const char *, const int *); 79 static int virtio_pci_detach(device_t, int); 80 81 #define NMAPREG ((PCI_MAPREG_END - PCI_MAPREG_START) / \ 82 sizeof(pcireg_t)) 83 struct virtio_pci_softc { 84 struct virtio_softc sc_sc; 85 bool sc_intr_pervq; 86 87 /* IO space */ 88 bus_space_tag_t sc_iot; 89 bus_space_handle_t sc_ioh; 90 bus_size_t sc_iosize; 91 92 /* BARs */ 93 bus_space_tag_t sc_bars_iot[NMAPREG]; 94 bus_space_handle_t sc_bars_ioh[NMAPREG]; 95 bus_size_t sc_bars_iosize[NMAPREG]; 96 97 /* notify space */ 98 bus_space_tag_t sc_notify_iot; 99 bus_space_handle_t sc_notify_ioh; 100 bus_size_t sc_notify_iosize; 101 uint32_t sc_notify_off_multiplier; 102 103 /* isr space */ 104 bus_space_tag_t sc_isr_iot; 105 bus_space_handle_t sc_isr_ioh; 106 bus_size_t sc_isr_iosize; 107 108 /* generic */ 109 struct pci_attach_args sc_pa; 110 pci_intr_handle_t *sc_ihp; 111 void **sc_ihs; 112 int sc_ihs_num; 113 int sc_devcfg_offset; /* for 0.9 */ 114 }; 115 116 static int virtio_pci_attach_09(device_t, void *); 117 static void virtio_pci_kick_09(struct virtio_softc *, uint16_t); 118 static uint16_t virtio_pci_read_queue_size_09(struct virtio_softc *, uint16_t); 119 static void virtio_pci_setup_queue_09(struct virtio_softc *, uint16_t, 120 uint64_t); 121 static void virtio_pci_set_status_09(struct virtio_softc *, int); 122 static void virtio_pci_negotiate_features_09(struct virtio_softc *, 123 uint64_t); 124 125 static int virtio_pci_attach_10(device_t, void *); 126 static void virtio_pci_kick_10(struct virtio_softc *, uint16_t); 127 static uint16_t virtio_pci_read_queue_size_10(struct virtio_softc *, uint16_t); 128 static void virtio_pci_setup_queue_10(struct virtio_softc *, uint16_t, 129 uint64_t); 130 static void virtio_pci_set_status_10(struct virtio_softc *, int); 131 static void virtio_pci_negotiate_features_10(struct virtio_softc *, 132 uint64_t); 133 static int virtio_pci_find_cap(struct virtio_pci_softc *, int, void *, 134 int); 135 136 static int virtio_pci_alloc_interrupts(struct virtio_softc *); 137 static void virtio_pci_free_interrupts(struct virtio_softc *); 138 static int virtio_pci_adjust_config_region(struct virtio_pci_softc *); 139 static int virtio_pci_intr(void *); 140 static int virtio_pci_msix_queue_intr(void *); 141 static int virtio_pci_msix_config_intr(void *); 142 static int virtio_pci_setup_interrupts_09(struct virtio_softc *, int); 143 static int virtio_pci_setup_interrupts_10(struct virtio_softc *, int); 144 static int virtio_pci_establish_msix_interrupts(struct virtio_softc *, 145 const struct pci_attach_args *); 146 static int virtio_pci_establish_intx_interrupt(struct virtio_softc *, 147 const struct pci_attach_args *); 148 static bool virtio_pci_msix_enabled(struct virtio_pci_softc *); 149 150 #define VIRTIO_MSIX_CONFIG_VECTOR_INDEX 0 151 #define VIRTIO_MSIX_QUEUE_VECTOR_INDEX 1 152 153 /* 154 * For big-endian aarch64/armv7 on QEMU (and most real HW), only CPU cores 155 * are running in big-endian mode, with all peripheral being configured to 156 * little-endian mode. Their default bus_space(9) functions forcibly swap 157 * byte-order. This guarantees that PIO'ed data from pci(4), e.g., are 158 * correctly handled by bus_space(9), while DMA'ed ones should be swapped 159 * by hand, in violation of virtio(4) specifications. 160 */ 161 162 #if (defined(__aarch64__) || defined(__arm__)) && BYTE_ORDER == BIG_ENDIAN 163 # define READ_ENDIAN_09 BIG_ENDIAN 164 # define READ_ENDIAN_10 BIG_ENDIAN 165 # define STRUCT_ENDIAN_09 BIG_ENDIAN 166 # define STRUCT_ENDIAN_10 LITTLE_ENDIAN 167 #elif BYTE_ORDER == BIG_ENDIAN 168 # define READ_ENDIAN_09 LITTLE_ENDIAN 169 # define READ_ENDIAN_10 BIG_ENDIAN 170 # define STRUCT_ENDIAN_09 BIG_ENDIAN 171 # define STRUCT_ENDIAN_10 LITTLE_ENDIAN 172 #else /* little endian */ 173 # define READ_ENDIAN_09 LITTLE_ENDIAN 174 # define READ_ENDIAN_10 LITTLE_ENDIAN 175 # define STRUCT_ENDIAN_09 LITTLE_ENDIAN 176 # define STRUCT_ENDIAN_10 LITTLE_ENDIAN 177 #endif 178 179 CFATTACH_DECL3_NEW(virtio_pci, sizeof(struct virtio_pci_softc), 180 virtio_pci_match, virtio_pci_attach, virtio_pci_detach, NULL, 181 virtio_pci_rescan, NULL, 0); 182 183 static const struct virtio_ops virtio_pci_ops_09 = { 184 .kick = virtio_pci_kick_09, 185 .read_queue_size = virtio_pci_read_queue_size_09, 186 .setup_queue = virtio_pci_setup_queue_09, 187 .set_status = virtio_pci_set_status_09, 188 .neg_features = virtio_pci_negotiate_features_09, 189 .alloc_interrupts = virtio_pci_alloc_interrupts, 190 .free_interrupts = virtio_pci_free_interrupts, 191 .setup_interrupts = virtio_pci_setup_interrupts_09, 192 }; 193 194 static const struct virtio_ops virtio_pci_ops_10 = { 195 .kick = virtio_pci_kick_10, 196 .read_queue_size = virtio_pci_read_queue_size_10, 197 .setup_queue = virtio_pci_setup_queue_10, 198 .set_status = virtio_pci_set_status_10, 199 .neg_features = virtio_pci_negotiate_features_10, 200 .alloc_interrupts = virtio_pci_alloc_interrupts, 201 .free_interrupts = virtio_pci_free_interrupts, 202 .setup_interrupts = virtio_pci_setup_interrupts_10, 203 }; 204 205 static int 206 virtio_pci_match(device_t parent, cfdata_t match, void *aux) 207 { 208 const struct pci_attach_args * const pa = aux; 209 210 switch (PCI_VENDOR(pa->pa_id)) { 211 case PCI_VENDOR_QUMRANET: 212 /* Transitional devices MUST have a PCI Revision ID of 0. */ 213 if (((PCI_PRODUCT_QUMRANET_VIRTIO_1000 <= 214 PCI_PRODUCT(pa->pa_id)) && 215 (PCI_PRODUCT(pa->pa_id) <= 216 PCI_PRODUCT_QUMRANET_VIRTIO_103F)) && 217 PCI_REVISION(pa->pa_class) == 0) 218 return 1; 219 /* 220 * Non-transitional devices SHOULD have a PCI Revision 221 * ID of 1 or higher. Drivers MUST match any PCI 222 * Revision ID value. 223 */ 224 if (((PCI_PRODUCT_QUMRANET_VIRTIO_1040 <= 225 PCI_PRODUCT(pa->pa_id)) && 226 (PCI_PRODUCT(pa->pa_id) <= 227 PCI_PRODUCT_QUMRANET_VIRTIO_107F)) && 228 /* XXX: TODO */ 229 PCI_REVISION(pa->pa_class) == 1) 230 return 1; 231 break; 232 } 233 234 return 0; 235 } 236 237 static void 238 virtio_pci_attach(device_t parent, device_t self, void *aux) 239 { 240 struct virtio_pci_softc * const psc = device_private(self); 241 struct virtio_softc * const sc = &psc->sc_sc; 242 const struct pci_attach_args * const pa = aux; 243 pci_chipset_tag_t pc = pa->pa_pc; 244 pcitag_t tag = pa->pa_tag; 245 int revision; 246 int ret; 247 pcireg_t id; 248 pcireg_t csr; 249 250 revision = PCI_REVISION(pa->pa_class); 251 switch (revision) { 252 case 0: 253 /* subsystem ID shows what I am */ 254 id = PCI_SUBSYS_ID(pci_conf_read(pc, tag, PCI_SUBSYS_ID_REG)); 255 break; 256 case 1: 257 /* pci product number shows what I am */ 258 id = PCI_PRODUCT(pa->pa_id) - PCI_PRODUCT_QUMRANET_VIRTIO_1040; 259 break; 260 default: 261 aprint_normal(": unknown revision 0x%02x; giving up\n", 262 revision); 263 return; 264 } 265 266 aprint_normal("\n"); 267 aprint_naive("\n"); 268 virtio_print_device_type(self, id, revision); 269 270 csr = pci_conf_read(pc, tag, PCI_COMMAND_STATUS_REG); 271 csr |= PCI_COMMAND_MASTER_ENABLE | PCI_COMMAND_IO_ENABLE; 272 pci_conf_write(pc, tag, PCI_COMMAND_STATUS_REG, csr); 273 274 sc->sc_dev = self; 275 psc->sc_pa = *pa; 276 psc->sc_iot = pa->pa_iot; 277 278 sc->sc_dmat = pa->pa_dmat; 279 if (pci_dma64_available(pa)) 280 sc->sc_dmat = pa->pa_dmat64; 281 282 /* attach is dependent on revision */ 283 ret = 0; 284 if (revision == 1) { 285 /* try to attach 1.0 */ 286 ret = virtio_pci_attach_10(self, aux); 287 } 288 if (ret == 0 && revision == 0) { 289 /* 290 * revision 0 means 0.9 only or both 0.9 and 1.0. The 291 * latter are so-called "Transitional Devices". For 292 * those devices, we want to use the 1.0 interface if 293 * possible. 294 * 295 * XXX Currently only on platforms that require 1.0 296 * XXX features, such as VIRTIO_F_ACCESS_PLATFORM. 297 */ 298 #ifdef __NEED_VIRTIO_F_ACCESS_PLATFORM 299 /* First, try to attach 1.0 */ 300 ret = virtio_pci_attach_10(self, aux); 301 if (ret != 0) { 302 aprint_error_dev(self, 303 "VirtIO 1.0 error = %d, falling back to 0.9\n", 304 ret); 305 /* Fall back to 0.9. */ 306 ret = virtio_pci_attach_09(self, aux); 307 } 308 #else 309 ret = virtio_pci_attach_09(self, aux); 310 #endif /* __NEED_VIRTIO_F_ACCESS_PLATFORM */ 311 } 312 if (ret) { 313 aprint_error_dev(self, "cannot attach (%d)\n", ret); 314 return; 315 } 316 KASSERT(sc->sc_ops); 317 318 /* preset config region */ 319 psc->sc_devcfg_offset = VIRTIO_CONFIG_DEVICE_CONFIG_NOMSI; 320 if (virtio_pci_adjust_config_region(psc)) 321 return; 322 323 /* generic */ 324 virtio_device_reset(sc); 325 virtio_set_status(sc, VIRTIO_CONFIG_DEVICE_STATUS_ACK); 326 virtio_set_status(sc, VIRTIO_CONFIG_DEVICE_STATUS_DRIVER); 327 328 sc->sc_childdevid = id; 329 sc->sc_child = NULL; 330 virtio_pci_rescan(self, NULL, NULL); 331 return; 332 } 333 334 /* ARGSUSED */ 335 static int 336 virtio_pci_rescan(device_t self, const char *ifattr, const int *locs) 337 { 338 struct virtio_pci_softc * const psc = device_private(self); 339 struct virtio_softc * const sc = &psc->sc_sc; 340 struct virtio_attach_args va; 341 342 if (sc->sc_child) /* Child already attached? */ 343 return 0; 344 345 memset(&va, 0, sizeof(va)); 346 va.sc_childdevid = sc->sc_childdevid; 347 348 config_found(self, &va, NULL, CFARGS_NONE); 349 350 if (virtio_attach_failed(sc)) 351 return 0; 352 353 return 0; 354 } 355 356 static int 357 virtio_pci_detach(device_t self, int flags) 358 { 359 struct virtio_pci_softc * const psc = device_private(self); 360 struct virtio_softc * const sc = &psc->sc_sc; 361 unsigned i; 362 int r; 363 364 r = config_detach_children(self, flags); 365 if (r != 0) 366 return r; 367 368 /* Check that child never attached, or detached properly */ 369 KASSERT(sc->sc_child == NULL); 370 KASSERT(sc->sc_vqs == NULL); 371 KASSERT(psc->sc_ihs_num == 0); 372 373 if (sc->sc_version_1) { 374 for (i = 0; i < __arraycount(psc->sc_bars_iot); i++) { 375 if (psc->sc_bars_iosize[i] == 0) 376 continue; 377 bus_space_unmap(psc->sc_bars_iot[i], 378 psc->sc_bars_ioh[i], psc->sc_bars_iosize[i]); 379 psc->sc_bars_iosize[i] = 0; 380 } 381 } else { 382 if (psc->sc_iosize) { 383 bus_space_unmap(psc->sc_iot, psc->sc_ioh, 384 psc->sc_iosize); 385 psc->sc_iosize = 0; 386 } 387 } 388 389 return 0; 390 } 391 392 static int 393 virtio_pci_attach_09(device_t self, void *aux) 394 { 395 struct virtio_pci_softc * const psc = device_private(self); 396 const struct pci_attach_args * const pa = aux; 397 struct virtio_softc * const sc = &psc->sc_sc; 398 399 /* complete IO region */ 400 if (pci_mapreg_map(pa, PCI_MAPREG_START, PCI_MAPREG_TYPE_IO, 0, 401 &psc->sc_iot, &psc->sc_ioh, NULL, &psc->sc_iosize)) { 402 aprint_error_dev(self, "can't map i/o space\n"); 403 return EIO; 404 } 405 406 /* queue space */ 407 if (bus_space_subregion(psc->sc_iot, psc->sc_ioh, 408 VIRTIO_CONFIG_QUEUE_NOTIFY, 2, &psc->sc_notify_ioh)) { 409 aprint_error_dev(self, "can't map notify i/o space\n"); 410 return EIO; 411 } 412 psc->sc_notify_iosize = 2; 413 psc->sc_notify_iot = psc->sc_iot; 414 415 /* ISR space */ 416 if (bus_space_subregion(psc->sc_iot, psc->sc_ioh, 417 VIRTIO_CONFIG_ISR_STATUS, 1, &psc->sc_isr_ioh)) { 418 aprint_error_dev(self, "can't map isr i/o space\n"); 419 return EIO; 420 } 421 psc->sc_isr_iosize = 1; 422 psc->sc_isr_iot = psc->sc_iot; 423 424 /* set our version 0.9 ops */ 425 sc->sc_ops = &virtio_pci_ops_09; 426 sc->sc_bus_endian = READ_ENDIAN_09; 427 sc->sc_struct_endian = STRUCT_ENDIAN_09; 428 return 0; 429 } 430 431 static int 432 virtio_pci_attach_10(device_t self, void *aux) 433 { 434 struct virtio_pci_softc * const psc = device_private(self); 435 const struct pci_attach_args * const pa = aux; 436 struct virtio_softc * const sc = &psc->sc_sc; 437 const pci_chipset_tag_t pc = pa->pa_pc; 438 const pcitag_t tag = pa->pa_tag; 439 440 struct virtio_pci_cap common, isr, device; 441 struct virtio_pci_notify_cap notify; 442 int have_device_cfg = 0; 443 bus_size_t bars[NMAPREG] = { 0 }; 444 int bars_idx[NMAPREG] = { 0 }; 445 struct virtio_pci_cap * const caps[] = 446 { &common, &isr, &device, ¬ify.cap }; 447 int i, j, ret = 0; 448 449 if (virtio_pci_find_cap(psc, VIRTIO_PCI_CAP_COMMON_CFG, 450 &common, sizeof(common))) 451 return ENODEV; 452 if (virtio_pci_find_cap(psc, VIRTIO_PCI_CAP_NOTIFY_CFG, 453 ¬ify, sizeof(notify))) 454 return ENODEV; 455 if (virtio_pci_find_cap(psc, VIRTIO_PCI_CAP_ISR_CFG, 456 &isr, sizeof(isr))) 457 return ENODEV; 458 if (virtio_pci_find_cap(psc, VIRTIO_PCI_CAP_DEVICE_CFG, 459 &device, sizeof(device))) 460 memset(&device, 0, sizeof(device)); 461 else 462 have_device_cfg = 1; 463 464 /* Figure out which bars we need to map */ 465 for (i = 0; i < __arraycount(caps); i++) { 466 int bar = caps[i]->bar; 467 bus_size_t len = caps[i]->offset + caps[i]->length; 468 469 if (caps[i]->length == 0) 470 continue; 471 if (bars[bar] < len) 472 bars[bar] = len; 473 } 474 475 for (i = j = 0; i < __arraycount(bars); i++) { 476 int reg; 477 pcireg_t type; 478 479 if (bars[i] == 0) 480 continue; 481 reg = PCI_BAR(i); 482 type = pci_mapreg_type(pc, tag, reg); 483 if (pci_mapreg_map(pa, reg, type, 0, 484 &psc->sc_bars_iot[j], &psc->sc_bars_ioh[j], 485 NULL, &psc->sc_bars_iosize[j])) { 486 aprint_error_dev(self, "can't map bar %u \n", i); 487 ret = EIO; 488 goto err; 489 } 490 aprint_debug_dev(self, 491 "bar[%d]: iot %p, size 0x%" PRIxBUSSIZE "\n", 492 j, psc->sc_bars_iot[j], psc->sc_bars_iosize[j]); 493 bars_idx[i] = j; 494 j++; 495 } 496 497 i = bars_idx[notify.cap.bar]; 498 if (bus_space_subregion(psc->sc_bars_iot[i], psc->sc_bars_ioh[i], 499 notify.cap.offset, notify.cap.length, &psc->sc_notify_ioh)) { 500 aprint_error_dev(self, "can't map notify i/o space\n"); 501 ret = EIO; 502 goto err; 503 } 504 psc->sc_notify_iosize = notify.cap.length; 505 psc->sc_notify_iot = psc->sc_bars_iot[i]; 506 psc->sc_notify_off_multiplier = le32toh(notify.notify_off_multiplier); 507 508 if (have_device_cfg) { 509 i = bars_idx[device.bar]; 510 if (bus_space_subregion(psc->sc_bars_iot[i], 511 psc->sc_bars_ioh[i], device.offset, device.length, 512 &sc->sc_devcfg_ioh)) { 513 aprint_error_dev(self, "can't map devcfg i/o space\n"); 514 ret = EIO; 515 goto err; 516 } 517 aprint_debug_dev(self, 518 "device.offset = 0x%x, device.length = 0x%x\n", 519 device.offset, device.length); 520 sc->sc_devcfg_iosize = device.length; 521 sc->sc_devcfg_iot = psc->sc_bars_iot[i]; 522 } 523 524 i = bars_idx[isr.bar]; 525 if (bus_space_subregion(psc->sc_bars_iot[i], psc->sc_bars_ioh[i], 526 isr.offset, isr.length, &psc->sc_isr_ioh)) { 527 aprint_error_dev(self, "can't map isr i/o space\n"); 528 ret = EIO; 529 goto err; 530 } 531 psc->sc_isr_iosize = isr.length; 532 psc->sc_isr_iot = psc->sc_bars_iot[i]; 533 534 i = bars_idx[common.bar]; 535 if (bus_space_subregion(psc->sc_bars_iot[i], psc->sc_bars_ioh[i], 536 common.offset, common.length, &psc->sc_ioh)) { 537 aprint_error_dev(self, "can't map common i/o space\n"); 538 ret = EIO; 539 goto err; 540 } 541 psc->sc_iosize = common.length; 542 psc->sc_iot = psc->sc_bars_iot[i]; 543 544 psc->sc_sc.sc_version_1 = 1; 545 546 /* set our version 1.0 ops */ 547 sc->sc_ops = &virtio_pci_ops_10; 548 sc->sc_bus_endian = READ_ENDIAN_10; 549 sc->sc_struct_endian = STRUCT_ENDIAN_10; 550 return 0; 551 552 err: 553 /* undo our pci_mapreg_map()s */ 554 for (i = 0; i < __arraycount(bars); i++) { 555 if (psc->sc_bars_iosize[i] == 0) 556 continue; 557 bus_space_unmap(psc->sc_bars_iot[i], psc->sc_bars_ioh[i], 558 psc->sc_bars_iosize[i]); 559 psc->sc_bars_iosize[i] = 0; 560 } 561 return ret; 562 } 563 564 /* v1.0 attach helper */ 565 static int 566 virtio_pci_find_cap(struct virtio_pci_softc *psc, int cfg_type, void *buf, 567 int buflen) 568 { 569 device_t self = psc->sc_sc.sc_dev; 570 pci_chipset_tag_t pc = psc->sc_pa.pa_pc; 571 pcitag_t tag = psc->sc_pa.pa_tag; 572 unsigned int offset, i, len; 573 union { 574 pcireg_t reg[8]; 575 struct virtio_pci_cap vcap; 576 } *v = buf; 577 578 if (buflen < sizeof(struct virtio_pci_cap)) 579 return ERANGE; 580 581 if (!pci_get_capability(pc, tag, PCI_CAP_VENDSPEC, &offset, 582 &v->reg[0])) 583 return ENOENT; 584 585 do { 586 for (i = 0; i < 4; i++) 587 v->reg[i] = 588 le32toh(pci_conf_read(pc, tag, offset + i * 4)); 589 if (v->vcap.cfg_type == cfg_type) 590 break; 591 offset = v->vcap.cap_next; 592 } while (offset != 0); 593 594 if (offset == 0) 595 return ENOENT; 596 597 if (v->vcap.cap_len > sizeof(struct virtio_pci_cap)) { 598 len = roundup(v->vcap.cap_len, sizeof(pcireg_t)); 599 if (len > buflen) { 600 aprint_error_dev(self, "%s cap too large\n", __func__); 601 return ERANGE; 602 } 603 for (i = 4; i < len / sizeof(pcireg_t); i++) 604 v->reg[i] = 605 le32toh(pci_conf_read(pc, tag, offset + i * 4)); 606 } 607 608 /* endian fixup */ 609 v->vcap.offset = le32toh(v->vcap.offset); 610 v->vcap.length = le32toh(v->vcap.length); 611 return 0; 612 } 613 614 /* ------------------------------------- 615 * Version 0.9 support 616 * -------------------------------------*/ 617 618 static void 619 virtio_pci_kick_09(struct virtio_softc *sc, uint16_t idx) 620 { 621 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 622 623 bus_space_write_2(psc->sc_notify_iot, psc->sc_notify_ioh, 0, idx); 624 } 625 626 /* only applicable for v 0.9 but also called for 1.0 */ 627 static int 628 virtio_pci_adjust_config_region(struct virtio_pci_softc *psc) 629 { 630 struct virtio_softc * const sc = &psc->sc_sc; 631 device_t self = sc->sc_dev; 632 633 if (psc->sc_sc.sc_version_1) 634 return 0; 635 636 sc->sc_devcfg_iosize = psc->sc_iosize - psc->sc_devcfg_offset; 637 sc->sc_devcfg_iot = psc->sc_iot; 638 if (bus_space_subregion(psc->sc_iot, psc->sc_ioh, 639 psc->sc_devcfg_offset, sc->sc_devcfg_iosize, 640 &sc->sc_devcfg_ioh)) { 641 aprint_error_dev(self, "can't map config i/o space\n"); 642 return EIO; 643 } 644 645 return 0; 646 } 647 648 static uint16_t 649 virtio_pci_read_queue_size_09(struct virtio_softc *sc, uint16_t idx) 650 { 651 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 652 653 bus_space_write_2(psc->sc_iot, psc->sc_ioh, 654 VIRTIO_CONFIG_QUEUE_SELECT, idx); 655 return bus_space_read_2(psc->sc_iot, psc->sc_ioh, 656 VIRTIO_CONFIG_QUEUE_SIZE); 657 } 658 659 static void 660 virtio_pci_setup_queue_09(struct virtio_softc *sc, uint16_t idx, uint64_t addr) 661 { 662 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 663 664 bus_space_write_2(psc->sc_iot, psc->sc_ioh, 665 VIRTIO_CONFIG_QUEUE_SELECT, idx); 666 bus_space_write_4(psc->sc_iot, psc->sc_ioh, 667 VIRTIO_CONFIG_QUEUE_ADDRESS, addr / VIRTIO_PAGE_SIZE); 668 669 if (psc->sc_ihs_num > 1) { 670 int vec = VIRTIO_MSIX_QUEUE_VECTOR_INDEX; 671 if (psc->sc_intr_pervq) 672 vec += idx; 673 bus_space_write_2(psc->sc_iot, psc->sc_ioh, 674 VIRTIO_CONFIG_MSI_QUEUE_VECTOR, vec); 675 } 676 } 677 678 static void 679 virtio_pci_set_status_09(struct virtio_softc *sc, int status) 680 { 681 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 682 int old = 0; 683 684 if (status != 0) { 685 old = bus_space_read_1(psc->sc_iot, psc->sc_ioh, 686 VIRTIO_CONFIG_DEVICE_STATUS); 687 } 688 bus_space_write_1(psc->sc_iot, psc->sc_ioh, 689 VIRTIO_CONFIG_DEVICE_STATUS, status|old); 690 } 691 692 static void 693 virtio_pci_negotiate_features_09(struct virtio_softc *sc, 694 uint64_t guest_features) 695 { 696 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 697 uint32_t r; 698 699 r = bus_space_read_4(psc->sc_iot, psc->sc_ioh, 700 VIRTIO_CONFIG_DEVICE_FEATURES); 701 702 r &= guest_features; 703 704 bus_space_write_4(psc->sc_iot, psc->sc_ioh, 705 VIRTIO_CONFIG_GUEST_FEATURES, r); 706 707 sc->sc_active_features = r; 708 } 709 710 /* ------------------------------------- 711 * Version 1.0 support 712 * -------------------------------------*/ 713 714 static void 715 virtio_pci_kick_10(struct virtio_softc *sc, uint16_t idx) 716 { 717 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 718 unsigned offset = sc->sc_vqs[idx].vq_notify_off * 719 psc->sc_notify_off_multiplier; 720 721 bus_space_write_2(psc->sc_notify_iot, psc->sc_notify_ioh, offset, idx); 722 } 723 724 static uint16_t 725 virtio_pci_read_queue_size_10(struct virtio_softc *sc, uint16_t idx) 726 { 727 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 728 bus_space_tag_t iot = psc->sc_iot; 729 bus_space_handle_t ioh = psc->sc_ioh; 730 731 bus_space_write_2(iot, ioh, VIRTIO_CONFIG1_QUEUE_SELECT, idx); 732 return bus_space_read_2(iot, ioh, VIRTIO_CONFIG1_QUEUE_SIZE); 733 } 734 735 /* 736 * By definition little endian only in v1.0. NB: "MAY" in the text 737 * below refers to "independently" (i.e. the order of accesses) not 738 * "32-bit" (which is restricted by the earlier "MUST"). 739 * 740 * 4.1.3.1 Driver Requirements: PCI Device Layout 741 * 742 * For device configuration access, the driver MUST use ... 32-bit 743 * wide and aligned accesses for ... 64-bit wide fields. For 64-bit 744 * fields, the driver MAY access each of the high and low 32-bit parts 745 * of the field independently. 746 */ 747 static __inline void 748 virtio_pci_bus_space_write_8(bus_space_tag_t iot, bus_space_handle_t ioh, 749 bus_size_t offset, uint64_t value) 750 { 751 #if _QUAD_HIGHWORD 752 bus_space_write_4(iot, ioh, offset, BUS_ADDR_LO32(value)); 753 bus_space_write_4(iot, ioh, offset + 4, BUS_ADDR_HI32(value)); 754 #else 755 bus_space_write_4(iot, ioh, offset, BUS_ADDR_HI32(value)); 756 bus_space_write_4(iot, ioh, offset + 4, BUS_ADDR_LO32(value)); 757 #endif 758 } 759 760 static void 761 virtio_pci_setup_queue_10(struct virtio_softc *sc, uint16_t idx, uint64_t addr) 762 { 763 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 764 struct virtqueue *vq = &sc->sc_vqs[idx]; 765 bus_space_tag_t iot = psc->sc_iot; 766 bus_space_handle_t ioh = psc->sc_ioh; 767 KASSERT(vq->vq_index == idx); 768 769 bus_space_write_2(iot, ioh, VIRTIO_CONFIG1_QUEUE_SELECT, vq->vq_index); 770 if (addr == 0) { 771 bus_space_write_2(iot, ioh, VIRTIO_CONFIG1_QUEUE_ENABLE, 0); 772 virtio_pci_bus_space_write_8(iot, ioh, 773 VIRTIO_CONFIG1_QUEUE_DESC, 0); 774 virtio_pci_bus_space_write_8(iot, ioh, 775 VIRTIO_CONFIG1_QUEUE_AVAIL, 0); 776 virtio_pci_bus_space_write_8(iot, ioh, 777 VIRTIO_CONFIG1_QUEUE_USED, 0); 778 } else { 779 virtio_pci_bus_space_write_8(iot, ioh, 780 VIRTIO_CONFIG1_QUEUE_DESC, addr); 781 virtio_pci_bus_space_write_8(iot, ioh, 782 VIRTIO_CONFIG1_QUEUE_AVAIL, addr + vq->vq_availoffset); 783 virtio_pci_bus_space_write_8(iot, ioh, 784 VIRTIO_CONFIG1_QUEUE_USED, addr + vq->vq_usedoffset); 785 bus_space_write_2(iot, ioh, 786 VIRTIO_CONFIG1_QUEUE_ENABLE, 1); 787 vq->vq_notify_off = bus_space_read_2(iot, ioh, 788 VIRTIO_CONFIG1_QUEUE_NOTIFY_OFF); 789 } 790 791 if (psc->sc_ihs_num > 1) { 792 int vec = VIRTIO_MSIX_QUEUE_VECTOR_INDEX; 793 if (psc->sc_intr_pervq) 794 vec += idx; 795 bus_space_write_2(iot, ioh, 796 VIRTIO_CONFIG1_QUEUE_MSIX_VECTOR, vec); 797 } 798 } 799 800 static void 801 virtio_pci_set_status_10(struct virtio_softc *sc, int status) 802 { 803 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 804 bus_space_tag_t iot = psc->sc_iot; 805 bus_space_handle_t ioh = psc->sc_ioh; 806 int old = 0; 807 808 if (status) 809 old = bus_space_read_1(iot, ioh, VIRTIO_CONFIG1_DEVICE_STATUS); 810 bus_space_write_1(iot, ioh, VIRTIO_CONFIG1_DEVICE_STATUS, 811 status | old); 812 } 813 814 void 815 virtio_pci_negotiate_features_10(struct virtio_softc *sc, 816 uint64_t guest_features) 817 { 818 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 819 device_t self = sc->sc_dev; 820 bus_space_tag_t iot = psc->sc_iot; 821 bus_space_handle_t ioh = psc->sc_ioh; 822 uint64_t host, negotiated, device_status; 823 824 guest_features |= VIRTIO_F_VERSION_1; 825 #ifdef __NEED_VIRTIO_F_ACCESS_PLATFORM 826 /* XXX This could use some work. */ 827 guest_features |= VIRTIO_F_ACCESS_PLATFORM; 828 #endif /* __NEED_VIRTIO_F_ACCESS_PLATFORM */ 829 /* notify on empty is 0.9 only */ 830 guest_features &= ~VIRTIO_F_NOTIFY_ON_EMPTY; 831 sc->sc_active_features = 0; 832 833 bus_space_write_4(iot, ioh, VIRTIO_CONFIG1_DEVICE_FEATURE_SELECT, 0); 834 host = bus_space_read_4(iot, ioh, VIRTIO_CONFIG1_DEVICE_FEATURE); 835 bus_space_write_4(iot, ioh, VIRTIO_CONFIG1_DEVICE_FEATURE_SELECT, 1); 836 host |= (uint64_t)bus_space_read_4(iot, ioh, 837 VIRTIO_CONFIG1_DEVICE_FEATURE) << 32; 838 839 negotiated = host & guest_features; 840 841 bus_space_write_4(iot, ioh, VIRTIO_CONFIG1_DRIVER_FEATURE_SELECT, 0); 842 bus_space_write_4(iot, ioh, VIRTIO_CONFIG1_DRIVER_FEATURE, 843 negotiated & 0xffffffff); 844 bus_space_write_4(iot, ioh, VIRTIO_CONFIG1_DRIVER_FEATURE_SELECT, 1); 845 bus_space_write_4(iot, ioh, VIRTIO_CONFIG1_DRIVER_FEATURE, 846 negotiated >> 32); 847 virtio_pci_set_status_10(sc, VIRTIO_CONFIG_DEVICE_STATUS_FEATURES_OK); 848 849 device_status = bus_space_read_1(iot, ioh, 850 VIRTIO_CONFIG1_DEVICE_STATUS); 851 if ((device_status & VIRTIO_CONFIG_DEVICE_STATUS_FEATURES_OK) == 0) { 852 aprint_error_dev(self, "feature negotiation failed\n"); 853 bus_space_write_1(iot, ioh, VIRTIO_CONFIG1_DEVICE_STATUS, 854 VIRTIO_CONFIG_DEVICE_STATUS_FAILED); 855 return; 856 } 857 858 if ((negotiated & VIRTIO_F_VERSION_1) == 0) { 859 aprint_error_dev(self, "host rejected version 1\n"); 860 bus_space_write_1(iot, ioh, VIRTIO_CONFIG1_DEVICE_STATUS, 861 VIRTIO_CONFIG_DEVICE_STATUS_FAILED); 862 return; 863 } 864 865 sc->sc_active_features = negotiated; 866 return; 867 } 868 869 /* ------------------------------------- 870 * Generic PCI interrupt code 871 * -------------------------------------*/ 872 873 static int 874 virtio_pci_setup_interrupts_10(struct virtio_softc *sc, int reinit) 875 { 876 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 877 bus_space_tag_t iot = psc->sc_iot; 878 bus_space_handle_t ioh = psc->sc_ioh; 879 int vector, ret, qid; 880 881 if (!virtio_pci_msix_enabled(psc)) 882 return 0; 883 884 vector = VIRTIO_MSIX_CONFIG_VECTOR_INDEX; 885 bus_space_write_2(iot, ioh, VIRTIO_CONFIG1_CONFIG_MSIX_VECTOR, vector); 886 ret = bus_space_read_2(iot, ioh, VIRTIO_CONFIG1_CONFIG_MSIX_VECTOR); 887 if (ret != vector) { 888 VIRTIO_PCI_LOG(sc, reinit, "can't set config msix vector\n"); 889 return -1; 890 } 891 892 for (qid = 0; qid < sc->sc_nvqs; qid++) { 893 vector = VIRTIO_MSIX_QUEUE_VECTOR_INDEX; 894 895 if (psc->sc_intr_pervq) 896 vector += qid; 897 bus_space_write_2(iot, ioh, VIRTIO_CONFIG1_QUEUE_SELECT, qid); 898 bus_space_write_2(iot, ioh, VIRTIO_CONFIG1_QUEUE_MSIX_VECTOR, 899 vector); 900 ret = bus_space_read_2(iot, ioh, 901 VIRTIO_CONFIG1_QUEUE_MSIX_VECTOR); 902 if (ret != vector) { 903 VIRTIO_PCI_LOG(sc, reinit, "can't set queue %d " 904 "msix vector\n", qid); 905 return -1; 906 } 907 } 908 909 return 0; 910 } 911 912 static int 913 virtio_pci_setup_interrupts_09(struct virtio_softc *sc, int reinit) 914 { 915 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 916 int offset, vector, ret, qid; 917 918 if (!virtio_pci_msix_enabled(psc)) 919 return 0; 920 921 offset = VIRTIO_CONFIG_MSI_CONFIG_VECTOR; 922 vector = VIRTIO_MSIX_CONFIG_VECTOR_INDEX; 923 924 bus_space_write_2(psc->sc_iot, psc->sc_ioh, offset, vector); 925 ret = bus_space_read_2(psc->sc_iot, psc->sc_ioh, offset); 926 if (ret != vector) { 927 aprint_debug_dev(sc->sc_dev, "%s: expected=%d, actual=%d\n", 928 __func__, vector, ret); 929 VIRTIO_PCI_LOG(sc, reinit, 930 "can't set config msix vector\n"); 931 return -1; 932 } 933 934 for (qid = 0; qid < sc->sc_nvqs; qid++) { 935 offset = VIRTIO_CONFIG_QUEUE_SELECT; 936 bus_space_write_2(psc->sc_iot, psc->sc_ioh, offset, qid); 937 938 offset = VIRTIO_CONFIG_MSI_QUEUE_VECTOR; 939 vector = VIRTIO_MSIX_QUEUE_VECTOR_INDEX; 940 941 if (psc->sc_intr_pervq) 942 vector += qid; 943 944 bus_space_write_2(psc->sc_iot, psc->sc_ioh, offset, vector); 945 ret = bus_space_read_2(psc->sc_iot, psc->sc_ioh, offset); 946 if (ret != vector) { 947 aprint_debug_dev(sc->sc_dev, "%s[qid=%d]:" 948 " expected=%d, actual=%d\n", 949 __func__, qid, vector, ret); 950 VIRTIO_PCI_LOG(sc, reinit, "can't set queue %d " 951 "msix vector\n", qid); 952 return -1; 953 } 954 } 955 956 return 0; 957 } 958 959 static int 960 virtio_pci_establish_msix_interrupts(struct virtio_softc *sc, 961 const struct pci_attach_args *pa) 962 { 963 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 964 device_t self = sc->sc_dev; 965 pci_chipset_tag_t pc = pa->pa_pc; 966 struct virtqueue *vq; 967 char intrbuf[PCI_INTRSTR_LEN]; 968 char intr_xname[INTRDEVNAMEBUF]; 969 char const *intrstr; 970 int idx, qid, n; 971 972 idx = VIRTIO_MSIX_CONFIG_VECTOR_INDEX; 973 if (sc->sc_flags & VIRTIO_F_INTR_MPSAFE) 974 pci_intr_setattr(pc, &psc->sc_ihp[idx], PCI_INTR_MPSAFE, true); 975 976 snprintf(intr_xname, sizeof(intr_xname), "%s config", 977 device_xname(sc->sc_dev)); 978 979 psc->sc_ihs[idx] = pci_intr_establish_xname(pc, psc->sc_ihp[idx], 980 sc->sc_ipl, virtio_pci_msix_config_intr, sc, intr_xname); 981 if (psc->sc_ihs[idx] == NULL) { 982 aprint_error_dev(self, 983 "couldn't establish MSI-X for config\n"); 984 goto error; 985 } 986 987 idx = VIRTIO_MSIX_QUEUE_VECTOR_INDEX; 988 if (psc->sc_intr_pervq) { 989 for (qid = 0; qid < sc->sc_nvqs; qid++) { 990 n = idx + qid; 991 vq = &sc->sc_vqs[qid]; 992 993 snprintf(intr_xname, sizeof(intr_xname), "%s vq#%d", 994 device_xname(sc->sc_dev), qid); 995 996 if (sc->sc_flags & VIRTIO_F_INTR_MPSAFE) { 997 pci_intr_setattr(pc, &psc->sc_ihp[n], 998 PCI_INTR_MPSAFE, true); 999 } 1000 1001 psc->sc_ihs[n] = pci_intr_establish_xname(pc, 1002 psc->sc_ihp[n], sc->sc_ipl, 1003 vq->vq_intrhand, vq->vq_intrhand_arg, intr_xname); 1004 if (psc->sc_ihs[n] == NULL) { 1005 aprint_error_dev(self, 1006 "couldn't establish MSI-X for a vq\n"); 1007 goto error; 1008 } 1009 } 1010 } else { 1011 if (sc->sc_flags & VIRTIO_F_INTR_MPSAFE) { 1012 pci_intr_setattr(pc, &psc->sc_ihp[idx], 1013 PCI_INTR_MPSAFE, true); 1014 } 1015 1016 snprintf(intr_xname, sizeof(intr_xname), "%s queues", 1017 device_xname(sc->sc_dev)); 1018 psc->sc_ihs[idx] = pci_intr_establish_xname(pc, 1019 psc->sc_ihp[idx], sc->sc_ipl, 1020 virtio_pci_msix_queue_intr, sc, intr_xname); 1021 if (psc->sc_ihs[idx] == NULL) { 1022 aprint_error_dev(self, 1023 "couldn't establish MSI-X for queues\n"); 1024 goto error; 1025 } 1026 } 1027 1028 idx = VIRTIO_MSIX_CONFIG_VECTOR_INDEX; 1029 intrstr = pci_intr_string(pc, psc->sc_ihp[idx], intrbuf, 1030 sizeof(intrbuf)); 1031 aprint_normal_dev(self, "config interrupting at %s\n", intrstr); 1032 idx = VIRTIO_MSIX_QUEUE_VECTOR_INDEX; 1033 if (psc->sc_intr_pervq) { 1034 kcpuset_t *affinity; 1035 int affinity_to, r; 1036 1037 kcpuset_create(&affinity, false); 1038 1039 for (qid = 0; qid < sc->sc_nvqs; qid++) { 1040 n = idx + qid; 1041 affinity_to = (qid / 2) % ncpu; 1042 1043 intrstr = pci_intr_string(pc, psc->sc_ihp[n], 1044 intrbuf, sizeof(intrbuf)); 1045 1046 kcpuset_zero(affinity); 1047 kcpuset_set(affinity, affinity_to); 1048 r = interrupt_distribute(psc->sc_ihs[n], affinity, 1049 NULL); 1050 if (r == 0) { 1051 aprint_normal_dev(self, 1052 "for vq #%d interrupting at %s" 1053 " affinity to %u\n", 1054 qid, intrstr, affinity_to); 1055 } else { 1056 aprint_normal_dev(self, 1057 "for vq #%d interrupting at %s\n", 1058 qid, intrstr); 1059 } 1060 } 1061 1062 kcpuset_destroy(affinity); 1063 } else { 1064 intrstr = pci_intr_string(pc, psc->sc_ihp[idx], intrbuf, 1065 sizeof(intrbuf)); 1066 aprint_normal_dev(self, "queues interrupting at %s\n", 1067 intrstr); 1068 } 1069 1070 return 0; 1071 1072 error: 1073 idx = VIRTIO_MSIX_CONFIG_VECTOR_INDEX; 1074 if (psc->sc_ihs[idx] != NULL) 1075 pci_intr_disestablish(psc->sc_pa.pa_pc, psc->sc_ihs[idx]); 1076 idx = VIRTIO_MSIX_QUEUE_VECTOR_INDEX; 1077 if (psc->sc_intr_pervq) { 1078 for (qid = 0; qid < sc->sc_nvqs; qid++) { 1079 n = idx + qid; 1080 if (psc->sc_ihs[n] == NULL) 1081 continue; 1082 pci_intr_disestablish(psc->sc_pa.pa_pc, 1083 psc->sc_ihs[n]); 1084 } 1085 1086 } else { 1087 if (psc->sc_ihs[idx] != NULL) { 1088 pci_intr_disestablish(psc->sc_pa.pa_pc, 1089 psc->sc_ihs[idx]); 1090 } 1091 } 1092 1093 return -1; 1094 } 1095 1096 static int 1097 virtio_pci_establish_intx_interrupt(struct virtio_softc *sc, 1098 const struct pci_attach_args *pa) 1099 { 1100 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 1101 device_t self = sc->sc_dev; 1102 pci_chipset_tag_t pc = pa->pa_pc; 1103 char intrbuf[PCI_INTRSTR_LEN]; 1104 char const *intrstr; 1105 1106 if (sc->sc_flags & VIRTIO_F_INTR_MPSAFE) 1107 pci_intr_setattr(pc, &psc->sc_ihp[0], PCI_INTR_MPSAFE, true); 1108 1109 psc->sc_ihs[0] = pci_intr_establish_xname(pc, psc->sc_ihp[0], 1110 sc->sc_ipl, virtio_pci_intr, sc, device_xname(sc->sc_dev)); 1111 if (psc->sc_ihs[0] == NULL) { 1112 aprint_error_dev(self, "couldn't establish INTx\n"); 1113 return -1; 1114 } 1115 1116 intrstr = pci_intr_string(pc, psc->sc_ihp[0], intrbuf, 1117 sizeof(intrbuf)); 1118 aprint_normal_dev(self, "interrupting at %s\n", intrstr); 1119 1120 return 0; 1121 } 1122 1123 static int 1124 virtio_pci_alloc_interrupts(struct virtio_softc *sc) 1125 { 1126 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 1127 device_t self = sc->sc_dev; 1128 pci_chipset_tag_t pc = psc->sc_pa.pa_pc; 1129 pcitag_t tag = psc->sc_pa.pa_tag; 1130 int error; 1131 int nmsix; 1132 int off; 1133 int counts[PCI_INTR_TYPE_SIZE]; 1134 pci_intr_type_t max_type; 1135 pcireg_t ctl; 1136 1137 nmsix = pci_msix_count(psc->sc_pa.pa_pc, psc->sc_pa.pa_tag); 1138 aprint_debug_dev(self, "pci_msix_count=%d\n", nmsix); 1139 1140 /* We need at least two: one for config and the other for queues */ 1141 if ((sc->sc_flags & VIRTIO_F_INTR_MSIX) == 0 || nmsix < 2) { 1142 /* Try INTx only */ 1143 max_type = PCI_INTR_TYPE_INTX; 1144 counts[PCI_INTR_TYPE_INTX] = 1; 1145 } else { 1146 /* Try MSI-X first and INTx second */ 1147 if (ISSET(sc->sc_flags, VIRTIO_F_INTR_PERVQ) && 1148 sc->sc_nvqs + VIRTIO_MSIX_QUEUE_VECTOR_INDEX <= nmsix) { 1149 nmsix = sc->sc_nvqs + VIRTIO_MSIX_QUEUE_VECTOR_INDEX; 1150 } else { 1151 nmsix = 2; 1152 } 1153 1154 max_type = PCI_INTR_TYPE_MSIX; 1155 counts[PCI_INTR_TYPE_MSIX] = nmsix; 1156 counts[PCI_INTR_TYPE_MSI] = 0; 1157 counts[PCI_INTR_TYPE_INTX] = 1; 1158 } 1159 1160 retry: 1161 error = pci_intr_alloc(&psc->sc_pa, &psc->sc_ihp, counts, max_type); 1162 if (error != 0) { 1163 aprint_error_dev(self, "couldn't map interrupt\n"); 1164 return -1; 1165 } 1166 1167 if (pci_intr_type(pc, psc->sc_ihp[0]) == PCI_INTR_TYPE_MSIX) { 1168 psc->sc_intr_pervq = nmsix > 2 ? true : false; 1169 psc->sc_ihs = kmem_zalloc(sizeof(*psc->sc_ihs) * nmsix, 1170 KM_SLEEP); 1171 1172 error = virtio_pci_establish_msix_interrupts(sc, &psc->sc_pa); 1173 if (error != 0) { 1174 kmem_free(psc->sc_ihs, sizeof(*psc->sc_ihs) * nmsix); 1175 pci_intr_release(pc, psc->sc_ihp, nmsix); 1176 1177 /* Retry INTx */ 1178 max_type = PCI_INTR_TYPE_INTX; 1179 counts[PCI_INTR_TYPE_INTX] = 1; 1180 goto retry; 1181 } 1182 1183 psc->sc_ihs_num = nmsix; 1184 psc->sc_devcfg_offset = VIRTIO_CONFIG_DEVICE_CONFIG_MSI; 1185 virtio_pci_adjust_config_region(psc); 1186 } else if (pci_intr_type(pc, psc->sc_ihp[0]) == PCI_INTR_TYPE_INTX) { 1187 psc->sc_intr_pervq = false; 1188 psc->sc_ihs = kmem_zalloc(sizeof(*psc->sc_ihs) * 1, 1189 KM_SLEEP); 1190 1191 error = virtio_pci_establish_intx_interrupt(sc, &psc->sc_pa); 1192 if (error != 0) { 1193 kmem_free(psc->sc_ihs, sizeof(*psc->sc_ihs) * 1); 1194 pci_intr_release(pc, psc->sc_ihp, 1); 1195 return -1; 1196 } 1197 1198 psc->sc_ihs_num = 1; 1199 psc->sc_devcfg_offset = VIRTIO_CONFIG_DEVICE_CONFIG_NOMSI; 1200 virtio_pci_adjust_config_region(psc); 1201 1202 error = pci_get_capability(pc, tag, PCI_CAP_MSIX, &off, NULL); 1203 if (error != 0) { 1204 ctl = pci_conf_read(pc, tag, off + PCI_MSIX_CTL); 1205 ctl &= ~PCI_MSIX_CTL_ENABLE; 1206 pci_conf_write(pc, tag, off + PCI_MSIX_CTL, ctl); 1207 } 1208 } 1209 1210 if (!psc->sc_intr_pervq) 1211 CLR(sc->sc_flags, VIRTIO_F_INTR_PERVQ); 1212 return 0; 1213 } 1214 1215 static void 1216 virtio_pci_free_interrupts(struct virtio_softc *sc) 1217 { 1218 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 1219 1220 for (int i = 0; i < psc->sc_ihs_num; i++) { 1221 if (psc->sc_ihs[i] == NULL) 1222 continue; 1223 pci_intr_disestablish(psc->sc_pa.pa_pc, psc->sc_ihs[i]); 1224 psc->sc_ihs[i] = NULL; 1225 } 1226 1227 if (psc->sc_ihs_num > 0) { 1228 pci_intr_release(psc->sc_pa.pa_pc, psc->sc_ihp, 1229 psc->sc_ihs_num); 1230 } 1231 1232 if (psc->sc_ihs != NULL) { 1233 kmem_free(psc->sc_ihs, sizeof(*psc->sc_ihs) * psc->sc_ihs_num); 1234 psc->sc_ihs = NULL; 1235 } 1236 psc->sc_ihs_num = 0; 1237 } 1238 1239 static bool 1240 virtio_pci_msix_enabled(struct virtio_pci_softc *psc) 1241 { 1242 pci_chipset_tag_t pc = psc->sc_pa.pa_pc; 1243 1244 if (pci_intr_type(pc, psc->sc_ihp[0]) == PCI_INTR_TYPE_MSIX) 1245 return true; 1246 1247 return false; 1248 } 1249 1250 /* 1251 * Interrupt handler. 1252 */ 1253 static int 1254 virtio_pci_intr(void *arg) 1255 { 1256 struct virtio_softc *sc = arg; 1257 struct virtio_pci_softc * const psc = (struct virtio_pci_softc *)sc; 1258 int isr, r = 0; 1259 1260 /* check and ack the interrupt */ 1261 isr = bus_space_read_1(psc->sc_isr_iot, psc->sc_isr_ioh, 0); 1262 if (isr == 0) 1263 return 0; 1264 if ((isr & VIRTIO_CONFIG_ISR_CONFIG_CHANGE) && 1265 (sc->sc_config_change != NULL)) 1266 r = (sc->sc_config_change)(sc); 1267 if (sc->sc_intrhand != NULL) { 1268 if (sc->sc_soft_ih != NULL) 1269 softint_schedule(sc->sc_soft_ih); 1270 else 1271 r |= (sc->sc_intrhand)(sc); 1272 } 1273 1274 return r; 1275 } 1276 1277 static int 1278 virtio_pci_msix_queue_intr(void *arg) 1279 { 1280 struct virtio_softc *sc = arg; 1281 int r = 0; 1282 1283 if (sc->sc_intrhand != NULL) { 1284 if (sc->sc_soft_ih != NULL) 1285 softint_schedule(sc->sc_soft_ih); 1286 else 1287 r |= (sc->sc_intrhand)(sc); 1288 } 1289 1290 return r; 1291 } 1292 1293 static int 1294 virtio_pci_msix_config_intr(void *arg) 1295 { 1296 struct virtio_softc *sc = arg; 1297 int r = 0; 1298 1299 if (sc->sc_config_change != NULL) 1300 r = (sc->sc_config_change)(sc); 1301 return r; 1302 } 1303 1304 MODULE(MODULE_CLASS_DRIVER, virtio_pci, "pci,virtio"); 1305 1306 #ifdef _MODULE 1307 #include "ioconf.c" 1308 #endif 1309 1310 static int 1311 virtio_pci_modcmd(modcmd_t cmd, void *opaque) 1312 { 1313 int error = 0; 1314 1315 #ifdef _MODULE 1316 switch (cmd) { 1317 case MODULE_CMD_INIT: 1318 error = config_init_component(cfdriver_ioconf_virtio_pci, 1319 cfattach_ioconf_virtio_pci, cfdata_ioconf_virtio_pci); 1320 break; 1321 case MODULE_CMD_FINI: 1322 error = config_fini_component(cfdriver_ioconf_virtio_pci, 1323 cfattach_ioconf_virtio_pci, cfdata_ioconf_virtio_pci); 1324 break; 1325 default: 1326 error = ENOTTY; 1327 break; 1328 } 1329 #endif 1330 1331 return error; 1332 } 1333
Indexes created Tue Sep 23 02:09:52 GMT 2025