1 /* 2 * QEMU sPAPR IOMMU (TCE) code 3 * 4 * Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com> 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 #include "qemu/osdep.h" 20 #include "qemu/error-report.h" 21 #include "hw/hw.h" 22 #include "qemu/log.h" 23 #include "sysemu/kvm.h" 24 #include "hw/qdev.h" 25 #include "kvm_ppc.h" 26 #include "sysemu/dma.h" 27 #include "exec/address-spaces.h" 28 #include "trace.h" 29 30 #include "hw/ppc/spapr.h" 31 #include "hw/ppc/spapr_vio.h" 32 33 #include <libfdt.h> 34 35 enum sPAPRTCEAccess { 36 SPAPR_TCE_FAULT = 0, 37 SPAPR_TCE_RO = 1, 38 SPAPR_TCE_WO = 2, 39 SPAPR_TCE_RW = 3, 40 }; 41 42 #define IOMMU_PAGE_SIZE(shift) (1ULL << (shift)) 43 #define IOMMU_PAGE_MASK(shift) (~(IOMMU_PAGE_SIZE(shift) - 1)) 44 45 static QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables; 46 47 sPAPRTCETable *spapr_tce_find_by_liobn(target_ulong liobn) 48 { 49 sPAPRTCETable *tcet; 50 51 if (liobn & 0xFFFFFFFF00000000ULL) { 52 hcall_dprintf("Request for out-of-bounds LIOBN 0x" TARGET_FMT_lx "\n", 53 liobn); 54 return NULL; 55 } 56 57 QLIST_FOREACH(tcet, &spapr_tce_tables, list) { 58 if (tcet->liobn == (uint32_t)liobn) { 59 return tcet; 60 } 61 } 62 63 return NULL; 64 } 65 66 static IOMMUAccessFlags spapr_tce_iommu_access_flags(uint64_t tce) 67 { 68 switch (tce & SPAPR_TCE_RW) { 69 case SPAPR_TCE_FAULT: 70 return IOMMU_NONE; 71 case SPAPR_TCE_RO: 72 return IOMMU_RO; 73 case SPAPR_TCE_WO: 74 return IOMMU_WO; 75 default: /* SPAPR_TCE_RW */ 76 return IOMMU_RW; 77 } 78 } 79 80 static uint64_t *spapr_tce_alloc_table(uint32_t liobn, 81 uint32_t page_shift, 82 uint32_t nb_table, 83 int *fd, 84 bool need_vfio) 85 { 86 uint64_t *table = NULL; 87 uint64_t window_size = (uint64_t)nb_table << page_shift; 88 89 if (kvm_enabled() && !(window_size >> 32)) { 90 table = kvmppc_create_spapr_tce(liobn, window_size, fd, need_vfio); 91 } 92 93 if (!table) { 94 *fd = -1; 95 table = g_malloc0(nb_table * sizeof(uint64_t)); 96 } 97 98 trace_spapr_iommu_new_table(liobn, table, *fd); 99 100 return table; 101 } 102 103 static void spapr_tce_free_table(uint64_t *table, int fd, uint32_t nb_table) 104 { 105 if (!kvm_enabled() || 106 (kvmppc_remove_spapr_tce(table, fd, nb_table) != 0)) { 107 g_free(table); 108 } 109 } 110 111 /* Called from RCU critical section */ 112 static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr, 113 bool is_write) 114 { 115 sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu); 116 uint64_t tce; 117 IOMMUTLBEntry ret = { 118 .target_as = &address_space_memory, 119 .iova = 0, 120 .translated_addr = 0, 121 .addr_mask = ~(hwaddr)0, 122 .perm = IOMMU_NONE, 123 }; 124 125 if ((addr >> tcet->page_shift) < tcet->nb_table) { 126 /* Check if we are in bound */ 127 hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift); 128 129 tce = tcet->table[addr >> tcet->page_shift]; 130 ret.iova = addr & page_mask; 131 ret.translated_addr = tce & page_mask; 132 ret.addr_mask = ~page_mask; 133 ret.perm = spapr_tce_iommu_access_flags(tce); 134 } 135 trace_spapr_iommu_xlate(tcet->liobn, addr, ret.iova, ret.perm, 136 ret.addr_mask); 137 138 return ret; 139 } 140 141 static void spapr_tce_table_pre_save(void *opaque) 142 { 143 sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque); 144 145 tcet->mig_table = tcet->table; 146 tcet->mig_nb_table = tcet->nb_table; 147 148 trace_spapr_iommu_pre_save(tcet->liobn, tcet->mig_nb_table, 149 tcet->bus_offset, tcet->page_shift); 150 } 151 152 static uint64_t spapr_tce_get_min_page_size(MemoryRegion *iommu) 153 { 154 sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu); 155 156 return 1ULL << tcet->page_shift; 157 } 158 159 static void spapr_tce_notify_flag_changed(MemoryRegion *iommu, 160 IOMMUNotifierFlag old, 161 IOMMUNotifierFlag new) 162 { 163 struct sPAPRTCETable *tbl = container_of(iommu, sPAPRTCETable, iommu); 164 165 if (old == IOMMU_NOTIFIER_NONE && new != IOMMU_NOTIFIER_NONE) { 166 spapr_tce_set_need_vfio(tbl, true); 167 } else if (old != IOMMU_NOTIFIER_NONE && new == IOMMU_NOTIFIER_NONE) { 168 spapr_tce_set_need_vfio(tbl, false); 169 } 170 } 171 172 static int spapr_tce_table_post_load(void *opaque, int version_id) 173 { 174 sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque); 175 uint32_t old_nb_table = tcet->nb_table; 176 uint64_t old_bus_offset = tcet->bus_offset; 177 uint32_t old_page_shift = tcet->page_shift; 178 179 if (tcet->vdev) { 180 spapr_vio_set_bypass(tcet->vdev, tcet->bypass); 181 } 182 183 if (tcet->mig_nb_table != tcet->nb_table) { 184 spapr_tce_table_disable(tcet); 185 } 186 187 if (tcet->mig_nb_table) { 188 if (!tcet->nb_table) { 189 spapr_tce_table_enable(tcet, old_page_shift, old_bus_offset, 190 tcet->mig_nb_table); 191 } 192 193 memcpy(tcet->table, tcet->mig_table, 194 tcet->nb_table * sizeof(tcet->table[0])); 195 196 free(tcet->mig_table); 197 tcet->mig_table = NULL; 198 } 199 200 trace_spapr_iommu_post_load(tcet->liobn, old_nb_table, tcet->nb_table, 201 tcet->bus_offset, tcet->page_shift); 202 203 return 0; 204 } 205 206 static bool spapr_tce_table_ex_needed(void *opaque) 207 { 208 sPAPRTCETable *tcet = opaque; 209 210 return tcet->bus_offset || tcet->page_shift != 0xC; 211 } 212 213 static const VMStateDescription vmstate_spapr_tce_table_ex = { 214 .name = "spapr_iommu_ex", 215 .version_id = 1, 216 .minimum_version_id = 1, 217 .needed = spapr_tce_table_ex_needed, 218 .fields = (VMStateField[]) { 219 VMSTATE_UINT64(bus_offset, sPAPRTCETable), 220 VMSTATE_UINT32(page_shift, sPAPRTCETable), 221 VMSTATE_END_OF_LIST() 222 }, 223 }; 224 225 static const VMStateDescription vmstate_spapr_tce_table = { 226 .name = "spapr_iommu", 227 .version_id = 2, 228 .minimum_version_id = 2, 229 .pre_save = spapr_tce_table_pre_save, 230 .post_load = spapr_tce_table_post_load, 231 .fields = (VMStateField []) { 232 /* Sanity check */ 233 VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable), 234 235 /* IOMMU state */ 236 VMSTATE_UINT32(mig_nb_table, sPAPRTCETable), 237 VMSTATE_BOOL(bypass, sPAPRTCETable), 238 VMSTATE_VARRAY_UINT32_ALLOC(mig_table, sPAPRTCETable, mig_nb_table, 0, 239 vmstate_info_uint64, uint64_t), 240 241 VMSTATE_END_OF_LIST() 242 }, 243 .subsections = (const VMStateDescription*[]) { 244 &vmstate_spapr_tce_table_ex, 245 NULL 246 } 247 }; 248 249 static MemoryRegionIOMMUOps spapr_iommu_ops = { 250 .translate = spapr_tce_translate_iommu, 251 .get_min_page_size = spapr_tce_get_min_page_size, 252 .notify_flag_changed = spapr_tce_notify_flag_changed, 253 }; 254 255 static int spapr_tce_table_realize(DeviceState *dev) 256 { 257 sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev); 258 Object *tcetobj = OBJECT(tcet); 259 char tmp[32]; 260 261 tcet->fd = -1; 262 tcet->need_vfio = false; 263 snprintf(tmp, sizeof(tmp), "tce-root-%x", tcet->liobn); 264 memory_region_init(&tcet->root, tcetobj, tmp, UINT64_MAX); 265 266 snprintf(tmp, sizeof(tmp), "tce-iommu-%x", tcet->liobn); 267 memory_region_init_iommu(&tcet->iommu, tcetobj, &spapr_iommu_ops, tmp, 0); 268 269 QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list); 270 271 vmstate_register(DEVICE(tcet), tcet->liobn, &vmstate_spapr_tce_table, 272 tcet); 273 274 return 0; 275 } 276 277 void spapr_tce_set_need_vfio(sPAPRTCETable *tcet, bool need_vfio) 278 { 279 size_t table_size = tcet->nb_table * sizeof(uint64_t); 280 void *newtable; 281 282 if (need_vfio == tcet->need_vfio) { 283 /* Nothing to do */ 284 return; 285 } 286 287 if (!need_vfio) { 288 /* FIXME: We don't support transition back to KVM accelerated 289 * TCEs yet */ 290 return; 291 } 292 293 tcet->need_vfio = true; 294 295 if (tcet->fd < 0) { 296 /* Table is already in userspace, nothing to be do */ 297 return; 298 } 299 300 newtable = g_malloc(table_size); 301 memcpy(newtable, tcet->table, table_size); 302 303 kvmppc_remove_spapr_tce(tcet->table, tcet->fd, tcet->nb_table); 304 305 tcet->fd = -1; 306 tcet->table = newtable; 307 } 308 309 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn) 310 { 311 sPAPRTCETable *tcet; 312 char tmp[32]; 313 314 if (spapr_tce_find_by_liobn(liobn)) { 315 error_report("Attempted to create TCE table with duplicate" 316 " LIOBN 0x%x", liobn); 317 return NULL; 318 } 319 320 tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE)); 321 tcet->liobn = liobn; 322 323 snprintf(tmp, sizeof(tmp), "tce-table-%x", liobn); 324 object_property_add_child(OBJECT(owner), tmp, OBJECT(tcet), NULL); 325 326 object_property_set_bool(OBJECT(tcet), true, "realized", NULL); 327 328 return tcet; 329 } 330 331 void spapr_tce_table_enable(sPAPRTCETable *tcet, 332 uint32_t page_shift, uint64_t bus_offset, 333 uint32_t nb_table) 334 { 335 if (tcet->nb_table) { 336 error_report("Warning: trying to enable already enabled TCE table"); 337 return; 338 } 339 340 tcet->bus_offset = bus_offset; 341 tcet->page_shift = page_shift; 342 tcet->nb_table = nb_table; 343 tcet->table = spapr_tce_alloc_table(tcet->liobn, 344 tcet->page_shift, 345 tcet->nb_table, 346 &tcet->fd, 347 tcet->need_vfio); 348 349 memory_region_set_size(&tcet->iommu, 350 (uint64_t)tcet->nb_table << tcet->page_shift); 351 memory_region_add_subregion(&tcet->root, tcet->bus_offset, &tcet->iommu); 352 } 353 354 void spapr_tce_table_disable(sPAPRTCETable *tcet) 355 { 356 if (!tcet->nb_table) { 357 return; 358 } 359 360 memory_region_del_subregion(&tcet->root, &tcet->iommu); 361 memory_region_set_size(&tcet->iommu, 0); 362 363 spapr_tce_free_table(tcet->table, tcet->fd, tcet->nb_table); 364 tcet->fd = -1; 365 tcet->table = NULL; 366 tcet->bus_offset = 0; 367 tcet->page_shift = 0; 368 tcet->nb_table = 0; 369 } 370 371 static void spapr_tce_table_unrealize(DeviceState *dev, Error **errp) 372 { 373 sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev); 374 375 QLIST_REMOVE(tcet, list); 376 377 spapr_tce_table_disable(tcet); 378 } 379 380 MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet) 381 { 382 return &tcet->root; 383 } 384 385 static void spapr_tce_reset(DeviceState *dev) 386 { 387 sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev); 388 size_t table_size = tcet->nb_table * sizeof(uint64_t); 389 390 if (tcet->nb_table) { 391 memset(tcet->table, 0, table_size); 392 } 393 } 394 395 static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba, 396 target_ulong tce) 397 { 398 IOMMUTLBEntry entry; 399 hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift); 400 unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift; 401 402 if (index >= tcet->nb_table) { 403 hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x" 404 TARGET_FMT_lx "\n", ioba); 405 return H_PARAMETER; 406 } 407 408 tcet->table[index] = tce; 409 410 entry.target_as = &address_space_memory, 411 entry.iova = (ioba - tcet->bus_offset) & page_mask; 412 entry.translated_addr = tce & page_mask; 413 entry.addr_mask = ~page_mask; 414 entry.perm = spapr_tce_iommu_access_flags(tce); 415 memory_region_notify_iommu(&tcet->iommu, entry); 416 417 return H_SUCCESS; 418 } 419 420 static target_ulong h_put_tce_indirect(PowerPCCPU *cpu, 421 sPAPRMachineState *spapr, 422 target_ulong opcode, target_ulong *args) 423 { 424 int i; 425 target_ulong liobn = args[0]; 426 target_ulong ioba = args[1]; 427 target_ulong ioba1 = ioba; 428 target_ulong tce_list = args[2]; 429 target_ulong npages = args[3]; 430 target_ulong ret = H_PARAMETER, tce = 0; 431 sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn); 432 CPUState *cs = CPU(cpu); 433 hwaddr page_mask, page_size; 434 435 if (!tcet) { 436 return H_PARAMETER; 437 } 438 439 if ((npages > 512) || (tce_list & SPAPR_TCE_PAGE_MASK)) { 440 return H_PARAMETER; 441 } 442 443 page_mask = IOMMU_PAGE_MASK(tcet->page_shift); 444 page_size = IOMMU_PAGE_SIZE(tcet->page_shift); 445 ioba &= page_mask; 446 447 for (i = 0; i < npages; ++i, ioba += page_size) { 448 tce = ldq_be_phys(cs->as, tce_list + i * sizeof(target_ulong)); 449 450 ret = put_tce_emu(tcet, ioba, tce); 451 if (ret) { 452 break; 453 } 454 } 455 456 /* Trace last successful or the first problematic entry */ 457 i = i ? (i - 1) : 0; 458 if (SPAPR_IS_PCI_LIOBN(liobn)) { 459 trace_spapr_iommu_pci_indirect(liobn, ioba1, tce_list, i, tce, ret); 460 } else { 461 trace_spapr_iommu_indirect(liobn, ioba1, tce_list, i, tce, ret); 462 } 463 return ret; 464 } 465 466 static target_ulong h_stuff_tce(PowerPCCPU *cpu, sPAPRMachineState *spapr, 467 target_ulong opcode, target_ulong *args) 468 { 469 int i; 470 target_ulong liobn = args[0]; 471 target_ulong ioba = args[1]; 472 target_ulong tce_value = args[2]; 473 target_ulong npages = args[3]; 474 target_ulong ret = H_PARAMETER; 475 sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn); 476 hwaddr page_mask, page_size; 477 478 if (!tcet) { 479 return H_PARAMETER; 480 } 481 482 if (npages > tcet->nb_table) { 483 return H_PARAMETER; 484 } 485 486 page_mask = IOMMU_PAGE_MASK(tcet->page_shift); 487 page_size = IOMMU_PAGE_SIZE(tcet->page_shift); 488 ioba &= page_mask; 489 490 for (i = 0; i < npages; ++i, ioba += page_size) { 491 ret = put_tce_emu(tcet, ioba, tce_value); 492 if (ret) { 493 break; 494 } 495 } 496 if (SPAPR_IS_PCI_LIOBN(liobn)) { 497 trace_spapr_iommu_pci_stuff(liobn, ioba, tce_value, npages, ret); 498 } else { 499 trace_spapr_iommu_stuff(liobn, ioba, tce_value, npages, ret); 500 } 501 502 return ret; 503 } 504 505 static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPRMachineState *spapr, 506 target_ulong opcode, target_ulong *args) 507 { 508 target_ulong liobn = args[0]; 509 target_ulong ioba = args[1]; 510 target_ulong tce = args[2]; 511 target_ulong ret = H_PARAMETER; 512 sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn); 513 514 if (tcet) { 515 hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift); 516 517 ioba &= page_mask; 518 519 ret = put_tce_emu(tcet, ioba, tce); 520 } 521 if (SPAPR_IS_PCI_LIOBN(liobn)) { 522 trace_spapr_iommu_pci_put(liobn, ioba, tce, ret); 523 } else { 524 trace_spapr_iommu_put(liobn, ioba, tce, ret); 525 } 526 527 return ret; 528 } 529 530 static target_ulong get_tce_emu(sPAPRTCETable *tcet, target_ulong ioba, 531 target_ulong *tce) 532 { 533 unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift; 534 535 if (index >= tcet->nb_table) { 536 hcall_dprintf("spapr_iommu_get_tce on out-of-bounds IOBA 0x" 537 TARGET_FMT_lx "\n", ioba); 538 return H_PARAMETER; 539 } 540 541 *tce = tcet->table[index]; 542 543 return H_SUCCESS; 544 } 545 546 static target_ulong h_get_tce(PowerPCCPU *cpu, sPAPRMachineState *spapr, 547 target_ulong opcode, target_ulong *args) 548 { 549 target_ulong liobn = args[0]; 550 target_ulong ioba = args[1]; 551 target_ulong tce = 0; 552 target_ulong ret = H_PARAMETER; 553 sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn); 554 555 if (tcet) { 556 hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift); 557 558 ioba &= page_mask; 559 560 ret = get_tce_emu(tcet, ioba, &tce); 561 if (!ret) { 562 args[0] = tce; 563 } 564 } 565 if (SPAPR_IS_PCI_LIOBN(liobn)) { 566 trace_spapr_iommu_pci_get(liobn, ioba, ret, tce); 567 } else { 568 trace_spapr_iommu_get(liobn, ioba, ret, tce); 569 } 570 571 return ret; 572 } 573 574 int spapr_dma_dt(void *fdt, int node_off, const char *propname, 575 uint32_t liobn, uint64_t window, uint32_t size) 576 { 577 uint32_t dma_prop[5]; 578 int ret; 579 580 dma_prop[0] = cpu_to_be32(liobn); 581 dma_prop[1] = cpu_to_be32(window >> 32); 582 dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF); 583 dma_prop[3] = 0; /* window size is 32 bits */ 584 dma_prop[4] = cpu_to_be32(size); 585 586 ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2); 587 if (ret < 0) { 588 return ret; 589 } 590 591 ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2); 592 if (ret < 0) { 593 return ret; 594 } 595 596 ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop)); 597 if (ret < 0) { 598 return ret; 599 } 600 601 return 0; 602 } 603 604 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname, 605 sPAPRTCETable *tcet) 606 { 607 if (!tcet) { 608 return 0; 609 } 610 611 return spapr_dma_dt(fdt, node_off, propname, 612 tcet->liobn, 0, tcet->nb_table << tcet->page_shift); 613 } 614 615 static void spapr_tce_table_class_init(ObjectClass *klass, void *data) 616 { 617 DeviceClass *dc = DEVICE_CLASS(klass); 618 dc->init = spapr_tce_table_realize; 619 dc->reset = spapr_tce_reset; 620 dc->unrealize = spapr_tce_table_unrealize; 621 622 QLIST_INIT(&spapr_tce_tables); 623 624 /* hcall-tce */ 625 spapr_register_hypercall(H_PUT_TCE, h_put_tce); 626 spapr_register_hypercall(H_GET_TCE, h_get_tce); 627 spapr_register_hypercall(H_PUT_TCE_INDIRECT, h_put_tce_indirect); 628 spapr_register_hypercall(H_STUFF_TCE, h_stuff_tce); 629 } 630 631 static TypeInfo spapr_tce_table_info = { 632 .name = TYPE_SPAPR_TCE_TABLE, 633 .parent = TYPE_DEVICE, 634 .instance_size = sizeof(sPAPRTCETable), 635 .class_init = spapr_tce_table_class_init, 636 }; 637 638 static void register_types(void) 639 { 640 type_register_static(&spapr_tce_table_info); 641 } 642 643 type_init(register_types); 644