1 /* 2 * QEMU PowerPC XIVE interrupt controller model 3 * 4 * Copyright (c) 2017-2018, IBM Corporation. 5 * 6 * This code is licensed under the GPL version 2 or later. See the 7 * COPYING file in the top-level directory. 8 */ 9 10 #include "qemu/osdep.h" 11 #include "qemu/log.h" 12 #include "qapi/error.h" 13 #include "target/ppc/cpu.h" 14 #include "sysemu/cpus.h" 15 #include "sysemu/dma.h" 16 #include "hw/qdev-properties.h" 17 #include "monitor/monitor.h" 18 #include "hw/ppc/xive.h" 19 #include "hw/ppc/xive_regs.h" 20 21 /* 22 * XIVE Thread Interrupt Management context 23 */ 24 25 /* 26 * Convert a priority number to an Interrupt Pending Buffer (IPB) 27 * register, which indicates a pending interrupt at the priority 28 * corresponding to the bit number 29 */ 30 static uint8_t priority_to_ipb(uint8_t priority) 31 { 32 return priority > XIVE_PRIORITY_MAX ? 33 0 : 1 << (XIVE_PRIORITY_MAX - priority); 34 } 35 36 /* 37 * Convert an Interrupt Pending Buffer (IPB) register to a Pending 38 * Interrupt Priority Register (PIPR), which contains the priority of 39 * the most favored pending notification. 40 */ 41 static uint8_t ipb_to_pipr(uint8_t ibp) 42 { 43 return ibp ? clz32((uint32_t)ibp << 24) : 0xff; 44 } 45 46 static void ipb_update(uint8_t *regs, uint8_t priority) 47 { 48 regs[TM_IPB] |= priority_to_ipb(priority); 49 regs[TM_PIPR] = ipb_to_pipr(regs[TM_IPB]); 50 } 51 52 static uint8_t exception_mask(uint8_t ring) 53 { 54 switch (ring) { 55 case TM_QW1_OS: 56 return TM_QW1_NSR_EO; 57 case TM_QW3_HV_PHYS: 58 return TM_QW3_NSR_HE; 59 default: 60 g_assert_not_reached(); 61 } 62 } 63 64 static uint64_t xive_tctx_accept(XiveTCTX *tctx, uint8_t ring) 65 { 66 uint8_t *regs = &tctx->regs[ring]; 67 uint8_t nsr = regs[TM_NSR]; 68 uint8_t mask = exception_mask(ring); 69 70 qemu_irq_lower(tctx->output); 71 72 if (regs[TM_NSR] & mask) { 73 uint8_t cppr = regs[TM_PIPR]; 74 75 regs[TM_CPPR] = cppr; 76 77 /* Reset the pending buffer bit */ 78 regs[TM_IPB] &= ~priority_to_ipb(cppr); 79 regs[TM_PIPR] = ipb_to_pipr(regs[TM_IPB]); 80 81 /* Drop Exception bit */ 82 regs[TM_NSR] &= ~mask; 83 } 84 85 return (nsr << 8) | regs[TM_CPPR]; 86 } 87 88 static void xive_tctx_notify(XiveTCTX *tctx, uint8_t ring) 89 { 90 uint8_t *regs = &tctx->regs[ring]; 91 92 if (regs[TM_PIPR] < regs[TM_CPPR]) { 93 switch (ring) { 94 case TM_QW1_OS: 95 regs[TM_NSR] |= TM_QW1_NSR_EO; 96 break; 97 case TM_QW3_HV_PHYS: 98 regs[TM_NSR] |= (TM_QW3_NSR_HE_PHYS << 6); 99 break; 100 default: 101 g_assert_not_reached(); 102 } 103 qemu_irq_raise(tctx->output); 104 } 105 } 106 107 static void xive_tctx_set_cppr(XiveTCTX *tctx, uint8_t ring, uint8_t cppr) 108 { 109 if (cppr > XIVE_PRIORITY_MAX) { 110 cppr = 0xff; 111 } 112 113 tctx->regs[ring + TM_CPPR] = cppr; 114 115 /* CPPR has changed, check if we need to raise a pending exception */ 116 xive_tctx_notify(tctx, ring); 117 } 118 119 /* 120 * XIVE Thread Interrupt Management Area (TIMA) 121 */ 122 123 static void xive_tm_set_hv_cppr(XiveTCTX *tctx, hwaddr offset, 124 uint64_t value, unsigned size) 125 { 126 xive_tctx_set_cppr(tctx, TM_QW3_HV_PHYS, value & 0xff); 127 } 128 129 static uint64_t xive_tm_ack_hv_reg(XiveTCTX *tctx, hwaddr offset, unsigned size) 130 { 131 return xive_tctx_accept(tctx, TM_QW3_HV_PHYS); 132 } 133 134 static uint64_t xive_tm_pull_pool_ctx(XiveTCTX *tctx, hwaddr offset, 135 unsigned size) 136 { 137 uint64_t ret; 138 139 ret = tctx->regs[TM_QW2_HV_POOL + TM_WORD2] & TM_QW2W2_POOL_CAM; 140 tctx->regs[TM_QW2_HV_POOL + TM_WORD2] &= ~TM_QW2W2_POOL_CAM; 141 return ret; 142 } 143 144 static void xive_tm_vt_push(XiveTCTX *tctx, hwaddr offset, 145 uint64_t value, unsigned size) 146 { 147 tctx->regs[TM_QW3_HV_PHYS + TM_WORD2] = value & 0xff; 148 } 149 150 static uint64_t xive_tm_vt_poll(XiveTCTX *tctx, hwaddr offset, unsigned size) 151 { 152 return tctx->regs[TM_QW3_HV_PHYS + TM_WORD2] & 0xff; 153 } 154 155 /* 156 * Define an access map for each page of the TIMA that we will use in 157 * the memory region ops to filter values when doing loads and stores 158 * of raw registers values 159 * 160 * Registers accessibility bits : 161 * 162 * 0x0 - no access 163 * 0x1 - write only 164 * 0x2 - read only 165 * 0x3 - read/write 166 */ 167 168 static const uint8_t xive_tm_hw_view[] = { 169 /* QW-0 User */ 3, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 0, 0, 0, 0, 170 /* QW-1 OS */ 3, 3, 3, 3, 3, 3, 0, 3, 3, 3, 3, 3, 0, 0, 0, 0, 171 /* QW-2 POOL */ 0, 0, 3, 3, 0, 0, 0, 0, 3, 3, 3, 3, 0, 0, 0, 0, 172 /* QW-3 PHYS */ 3, 3, 3, 3, 0, 3, 0, 3, 3, 0, 0, 3, 3, 3, 3, 0, 173 }; 174 175 static const uint8_t xive_tm_hv_view[] = { 176 /* QW-0 User */ 3, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 0, 0, 0, 0, 177 /* QW-1 OS */ 3, 3, 3, 3, 3, 3, 0, 3, 3, 3, 3, 3, 0, 0, 0, 0, 178 /* QW-2 POOL */ 0, 0, 3, 3, 0, 0, 0, 0, 0, 3, 3, 3, 0, 0, 0, 0, 179 /* QW-3 PHYS */ 3, 3, 3, 3, 0, 3, 0, 3, 3, 0, 0, 3, 0, 0, 0, 0, 180 }; 181 182 static const uint8_t xive_tm_os_view[] = { 183 /* QW-0 User */ 3, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 0, 0, 0, 0, 184 /* QW-1 OS */ 2, 3, 2, 2, 2, 2, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 185 /* QW-2 POOL */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 186 /* QW-3 PHYS */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 187 }; 188 189 static const uint8_t xive_tm_user_view[] = { 190 /* QW-0 User */ 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 191 /* QW-1 OS */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 192 /* QW-2 POOL */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 193 /* QW-3 PHYS */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 194 }; 195 196 /* 197 * Overall TIMA access map for the thread interrupt management context 198 * registers 199 */ 200 static const uint8_t *xive_tm_views[] = { 201 [XIVE_TM_HW_PAGE] = xive_tm_hw_view, 202 [XIVE_TM_HV_PAGE] = xive_tm_hv_view, 203 [XIVE_TM_OS_PAGE] = xive_tm_os_view, 204 [XIVE_TM_USER_PAGE] = xive_tm_user_view, 205 }; 206 207 /* 208 * Computes a register access mask for a given offset in the TIMA 209 */ 210 static uint64_t xive_tm_mask(hwaddr offset, unsigned size, bool write) 211 { 212 uint8_t page_offset = (offset >> TM_SHIFT) & 0x3; 213 uint8_t reg_offset = offset & 0x3F; 214 uint8_t reg_mask = write ? 0x1 : 0x2; 215 uint64_t mask = 0x0; 216 int i; 217 218 for (i = 0; i < size; i++) { 219 if (xive_tm_views[page_offset][reg_offset + i] & reg_mask) { 220 mask |= (uint64_t) 0xff << (8 * (size - i - 1)); 221 } 222 } 223 224 return mask; 225 } 226 227 static void xive_tm_raw_write(XiveTCTX *tctx, hwaddr offset, uint64_t value, 228 unsigned size) 229 { 230 uint8_t ring_offset = offset & 0x30; 231 uint8_t reg_offset = offset & 0x3F; 232 uint64_t mask = xive_tm_mask(offset, size, true); 233 int i; 234 235 /* 236 * Only 4 or 8 bytes stores are allowed and the User ring is 237 * excluded 238 */ 239 if (size < 4 || !mask || ring_offset == TM_QW0_USER) { 240 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid write access at TIMA @%" 241 HWADDR_PRIx"\n", offset); 242 return; 243 } 244 245 /* 246 * Use the register offset for the raw values and filter out 247 * reserved values 248 */ 249 for (i = 0; i < size; i++) { 250 uint8_t byte_mask = (mask >> (8 * (size - i - 1))); 251 if (byte_mask) { 252 tctx->regs[reg_offset + i] = (value >> (8 * (size - i - 1))) & 253 byte_mask; 254 } 255 } 256 } 257 258 static uint64_t xive_tm_raw_read(XiveTCTX *tctx, hwaddr offset, unsigned size) 259 { 260 uint8_t ring_offset = offset & 0x30; 261 uint8_t reg_offset = offset & 0x3F; 262 uint64_t mask = xive_tm_mask(offset, size, false); 263 uint64_t ret; 264 int i; 265 266 /* 267 * Only 4 or 8 bytes loads are allowed and the User ring is 268 * excluded 269 */ 270 if (size < 4 || !mask || ring_offset == TM_QW0_USER) { 271 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid read access at TIMA @%" 272 HWADDR_PRIx"\n", offset); 273 return -1; 274 } 275 276 /* Use the register offset for the raw values */ 277 ret = 0; 278 for (i = 0; i < size; i++) { 279 ret |= (uint64_t) tctx->regs[reg_offset + i] << (8 * (size - i - 1)); 280 } 281 282 /* filter out reserved values */ 283 return ret & mask; 284 } 285 286 /* 287 * The TM context is mapped twice within each page. Stores and loads 288 * to the first mapping below 2K write and read the specified values 289 * without modification. The second mapping above 2K performs specific 290 * state changes (side effects) in addition to setting/returning the 291 * interrupt management area context of the processor thread. 292 */ 293 static uint64_t xive_tm_ack_os_reg(XiveTCTX *tctx, hwaddr offset, unsigned size) 294 { 295 return xive_tctx_accept(tctx, TM_QW1_OS); 296 } 297 298 static void xive_tm_set_os_cppr(XiveTCTX *tctx, hwaddr offset, 299 uint64_t value, unsigned size) 300 { 301 xive_tctx_set_cppr(tctx, TM_QW1_OS, value & 0xff); 302 } 303 304 /* 305 * Adjust the IPB to allow a CPU to process event queues of other 306 * priorities during one physical interrupt cycle. 307 */ 308 static void xive_tm_set_os_pending(XiveTCTX *tctx, hwaddr offset, 309 uint64_t value, unsigned size) 310 { 311 ipb_update(&tctx->regs[TM_QW1_OS], value & 0xff); 312 xive_tctx_notify(tctx, TM_QW1_OS); 313 } 314 315 /* 316 * Define a mapping of "special" operations depending on the TIMA page 317 * offset and the size of the operation. 318 */ 319 typedef struct XiveTmOp { 320 uint8_t page_offset; 321 uint32_t op_offset; 322 unsigned size; 323 void (*write_handler)(XiveTCTX *tctx, hwaddr offset, uint64_t value, 324 unsigned size); 325 uint64_t (*read_handler)(XiveTCTX *tctx, hwaddr offset, unsigned size); 326 } XiveTmOp; 327 328 static const XiveTmOp xive_tm_operations[] = { 329 /* 330 * MMIOs below 2K : raw values and special operations without side 331 * effects 332 */ 333 { XIVE_TM_OS_PAGE, TM_QW1_OS + TM_CPPR, 1, xive_tm_set_os_cppr, NULL }, 334 { XIVE_TM_HV_PAGE, TM_QW3_HV_PHYS + TM_CPPR, 1, xive_tm_set_hv_cppr, NULL }, 335 { XIVE_TM_HV_PAGE, TM_QW3_HV_PHYS + TM_WORD2, 1, xive_tm_vt_push, NULL }, 336 { XIVE_TM_HV_PAGE, TM_QW3_HV_PHYS + TM_WORD2, 1, NULL, xive_tm_vt_poll }, 337 338 /* MMIOs above 2K : special operations with side effects */ 339 { XIVE_TM_OS_PAGE, TM_SPC_ACK_OS_REG, 2, NULL, xive_tm_ack_os_reg }, 340 { XIVE_TM_OS_PAGE, TM_SPC_SET_OS_PENDING, 1, xive_tm_set_os_pending, NULL }, 341 { XIVE_TM_HV_PAGE, TM_SPC_ACK_HV_REG, 2, NULL, xive_tm_ack_hv_reg }, 342 { XIVE_TM_HV_PAGE, TM_SPC_PULL_POOL_CTX, 4, NULL, xive_tm_pull_pool_ctx }, 343 { XIVE_TM_HV_PAGE, TM_SPC_PULL_POOL_CTX, 8, NULL, xive_tm_pull_pool_ctx }, 344 }; 345 346 static const XiveTmOp *xive_tm_find_op(hwaddr offset, unsigned size, bool write) 347 { 348 uint8_t page_offset = (offset >> TM_SHIFT) & 0x3; 349 uint32_t op_offset = offset & 0xFFF; 350 int i; 351 352 for (i = 0; i < ARRAY_SIZE(xive_tm_operations); i++) { 353 const XiveTmOp *xto = &xive_tm_operations[i]; 354 355 /* Accesses done from a more privileged TIMA page is allowed */ 356 if (xto->page_offset >= page_offset && 357 xto->op_offset == op_offset && 358 xto->size == size && 359 ((write && xto->write_handler) || (!write && xto->read_handler))) { 360 return xto; 361 } 362 } 363 return NULL; 364 } 365 366 /* 367 * TIMA MMIO handlers 368 */ 369 void xive_tctx_tm_write(XiveTCTX *tctx, hwaddr offset, uint64_t value, 370 unsigned size) 371 { 372 const XiveTmOp *xto; 373 374 /* 375 * TODO: check V bit in Q[0-3]W2 376 */ 377 378 /* 379 * First, check for special operations in the 2K region 380 */ 381 if (offset & 0x800) { 382 xto = xive_tm_find_op(offset, size, true); 383 if (!xto) { 384 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid write access at TIMA" 385 "@%"HWADDR_PRIx"\n", offset); 386 } else { 387 xto->write_handler(tctx, offset, value, size); 388 } 389 return; 390 } 391 392 /* 393 * Then, for special operations in the region below 2K. 394 */ 395 xto = xive_tm_find_op(offset, size, true); 396 if (xto) { 397 xto->write_handler(tctx, offset, value, size); 398 return; 399 } 400 401 /* 402 * Finish with raw access to the register values 403 */ 404 xive_tm_raw_write(tctx, offset, value, size); 405 } 406 407 uint64_t xive_tctx_tm_read(XiveTCTX *tctx, hwaddr offset, unsigned size) 408 { 409 const XiveTmOp *xto; 410 411 /* 412 * TODO: check V bit in Q[0-3]W2 413 */ 414 415 /* 416 * First, check for special operations in the 2K region 417 */ 418 if (offset & 0x800) { 419 xto = xive_tm_find_op(offset, size, false); 420 if (!xto) { 421 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid read access to TIMA" 422 "@%"HWADDR_PRIx"\n", offset); 423 return -1; 424 } 425 return xto->read_handler(tctx, offset, size); 426 } 427 428 /* 429 * Then, for special operations in the region below 2K. 430 */ 431 xto = xive_tm_find_op(offset, size, false); 432 if (xto) { 433 return xto->read_handler(tctx, offset, size); 434 } 435 436 /* 437 * Finish with raw access to the register values 438 */ 439 return xive_tm_raw_read(tctx, offset, size); 440 } 441 442 static void xive_tm_write(void *opaque, hwaddr offset, 443 uint64_t value, unsigned size) 444 { 445 XiveTCTX *tctx = xive_router_get_tctx(XIVE_ROUTER(opaque), current_cpu); 446 447 xive_tctx_tm_write(tctx, offset, value, size); 448 } 449 450 static uint64_t xive_tm_read(void *opaque, hwaddr offset, unsigned size) 451 { 452 XiveTCTX *tctx = xive_router_get_tctx(XIVE_ROUTER(opaque), current_cpu); 453 454 return xive_tctx_tm_read(tctx, offset, size); 455 } 456 457 const MemoryRegionOps xive_tm_ops = { 458 .read = xive_tm_read, 459 .write = xive_tm_write, 460 .endianness = DEVICE_BIG_ENDIAN, 461 .valid = { 462 .min_access_size = 1, 463 .max_access_size = 8, 464 }, 465 .impl = { 466 .min_access_size = 1, 467 .max_access_size = 8, 468 }, 469 }; 470 471 static inline uint32_t xive_tctx_word2(uint8_t *ring) 472 { 473 return *((uint32_t *) &ring[TM_WORD2]); 474 } 475 476 static char *xive_tctx_ring_print(uint8_t *ring) 477 { 478 uint32_t w2 = xive_tctx_word2(ring); 479 480 return g_strdup_printf("%02x %02x %02x %02x %02x " 481 "%02x %02x %02x %08x", 482 ring[TM_NSR], ring[TM_CPPR], ring[TM_IPB], ring[TM_LSMFB], 483 ring[TM_ACK_CNT], ring[TM_INC], ring[TM_AGE], ring[TM_PIPR], 484 be32_to_cpu(w2)); 485 } 486 487 static const char * const xive_tctx_ring_names[] = { 488 "USER", "OS", "POOL", "PHYS", 489 }; 490 491 void xive_tctx_pic_print_info(XiveTCTX *tctx, Monitor *mon) 492 { 493 int cpu_index = tctx->cs ? tctx->cs->cpu_index : -1; 494 int i; 495 496 monitor_printf(mon, "CPU[%04x]: QW NSR CPPR IPB LSMFB ACK# INC AGE PIPR" 497 " W2\n", cpu_index); 498 499 for (i = 0; i < XIVE_TM_RING_COUNT; i++) { 500 char *s = xive_tctx_ring_print(&tctx->regs[i * XIVE_TM_RING_SIZE]); 501 monitor_printf(mon, "CPU[%04x]: %4s %s\n", cpu_index, 502 xive_tctx_ring_names[i], s); 503 g_free(s); 504 } 505 } 506 507 static void xive_tctx_reset(void *dev) 508 { 509 XiveTCTX *tctx = XIVE_TCTX(dev); 510 511 memset(tctx->regs, 0, sizeof(tctx->regs)); 512 513 /* Set some defaults */ 514 tctx->regs[TM_QW1_OS + TM_LSMFB] = 0xFF; 515 tctx->regs[TM_QW1_OS + TM_ACK_CNT] = 0xFF; 516 tctx->regs[TM_QW1_OS + TM_AGE] = 0xFF; 517 518 /* 519 * Initialize PIPR to 0xFF to avoid phantom interrupts when the 520 * CPPR is first set. 521 */ 522 tctx->regs[TM_QW1_OS + TM_PIPR] = 523 ipb_to_pipr(tctx->regs[TM_QW1_OS + TM_IPB]); 524 tctx->regs[TM_QW3_HV_PHYS + TM_PIPR] = 525 ipb_to_pipr(tctx->regs[TM_QW3_HV_PHYS + TM_IPB]); 526 } 527 528 static void xive_tctx_realize(DeviceState *dev, Error **errp) 529 { 530 XiveTCTX *tctx = XIVE_TCTX(dev); 531 PowerPCCPU *cpu; 532 CPUPPCState *env; 533 Object *obj; 534 Error *local_err = NULL; 535 536 obj = object_property_get_link(OBJECT(dev), "cpu", &local_err); 537 if (!obj) { 538 error_propagate(errp, local_err); 539 error_prepend(errp, "required link 'cpu' not found: "); 540 return; 541 } 542 543 cpu = POWERPC_CPU(obj); 544 tctx->cs = CPU(obj); 545 546 env = &cpu->env; 547 switch (PPC_INPUT(env)) { 548 case PPC_FLAGS_INPUT_POWER9: 549 tctx->output = env->irq_inputs[POWER9_INPUT_INT]; 550 break; 551 552 default: 553 error_setg(errp, "XIVE interrupt controller does not support " 554 "this CPU bus model"); 555 return; 556 } 557 558 qemu_register_reset(xive_tctx_reset, dev); 559 } 560 561 static void xive_tctx_unrealize(DeviceState *dev, Error **errp) 562 { 563 qemu_unregister_reset(xive_tctx_reset, dev); 564 } 565 566 static const VMStateDescription vmstate_xive_tctx = { 567 .name = TYPE_XIVE_TCTX, 568 .version_id = 1, 569 .minimum_version_id = 1, 570 .fields = (VMStateField[]) { 571 VMSTATE_BUFFER(regs, XiveTCTX), 572 VMSTATE_END_OF_LIST() 573 }, 574 }; 575 576 static void xive_tctx_class_init(ObjectClass *klass, void *data) 577 { 578 DeviceClass *dc = DEVICE_CLASS(klass); 579 580 dc->desc = "XIVE Interrupt Thread Context"; 581 dc->realize = xive_tctx_realize; 582 dc->unrealize = xive_tctx_unrealize; 583 dc->vmsd = &vmstate_xive_tctx; 584 } 585 586 static const TypeInfo xive_tctx_info = { 587 .name = TYPE_XIVE_TCTX, 588 .parent = TYPE_DEVICE, 589 .instance_size = sizeof(XiveTCTX), 590 .class_init = xive_tctx_class_init, 591 }; 592 593 Object *xive_tctx_create(Object *cpu, XiveRouter *xrtr, Error **errp) 594 { 595 Error *local_err = NULL; 596 Object *obj; 597 598 obj = object_new(TYPE_XIVE_TCTX); 599 object_property_add_child(cpu, TYPE_XIVE_TCTX, obj, &error_abort); 600 object_unref(obj); 601 object_property_add_const_link(obj, "cpu", cpu, &error_abort); 602 object_property_set_bool(obj, true, "realized", &local_err); 603 if (local_err) { 604 goto error; 605 } 606 607 return obj; 608 609 error: 610 object_unparent(obj); 611 error_propagate(errp, local_err); 612 return NULL; 613 } 614 615 /* 616 * XIVE ESB helpers 617 */ 618 619 static uint8_t xive_esb_set(uint8_t *pq, uint8_t value) 620 { 621 uint8_t old_pq = *pq & 0x3; 622 623 *pq &= ~0x3; 624 *pq |= value & 0x3; 625 626 return old_pq; 627 } 628 629 static bool xive_esb_trigger(uint8_t *pq) 630 { 631 uint8_t old_pq = *pq & 0x3; 632 633 switch (old_pq) { 634 case XIVE_ESB_RESET: 635 xive_esb_set(pq, XIVE_ESB_PENDING); 636 return true; 637 case XIVE_ESB_PENDING: 638 case XIVE_ESB_QUEUED: 639 xive_esb_set(pq, XIVE_ESB_QUEUED); 640 return false; 641 case XIVE_ESB_OFF: 642 xive_esb_set(pq, XIVE_ESB_OFF); 643 return false; 644 default: 645 g_assert_not_reached(); 646 } 647 } 648 649 static bool xive_esb_eoi(uint8_t *pq) 650 { 651 uint8_t old_pq = *pq & 0x3; 652 653 switch (old_pq) { 654 case XIVE_ESB_RESET: 655 case XIVE_ESB_PENDING: 656 xive_esb_set(pq, XIVE_ESB_RESET); 657 return false; 658 case XIVE_ESB_QUEUED: 659 xive_esb_set(pq, XIVE_ESB_PENDING); 660 return true; 661 case XIVE_ESB_OFF: 662 xive_esb_set(pq, XIVE_ESB_OFF); 663 return false; 664 default: 665 g_assert_not_reached(); 666 } 667 } 668 669 /* 670 * XIVE Interrupt Source (or IVSE) 671 */ 672 673 uint8_t xive_source_esb_get(XiveSource *xsrc, uint32_t srcno) 674 { 675 assert(srcno < xsrc->nr_irqs); 676 677 return xsrc->status[srcno] & 0x3; 678 } 679 680 uint8_t xive_source_esb_set(XiveSource *xsrc, uint32_t srcno, uint8_t pq) 681 { 682 assert(srcno < xsrc->nr_irqs); 683 684 return xive_esb_set(&xsrc->status[srcno], pq); 685 } 686 687 /* 688 * Returns whether the event notification should be forwarded. 689 */ 690 static bool xive_source_lsi_trigger(XiveSource *xsrc, uint32_t srcno) 691 { 692 uint8_t old_pq = xive_source_esb_get(xsrc, srcno); 693 694 xsrc->status[srcno] |= XIVE_STATUS_ASSERTED; 695 696 switch (old_pq) { 697 case XIVE_ESB_RESET: 698 xive_source_esb_set(xsrc, srcno, XIVE_ESB_PENDING); 699 return true; 700 default: 701 return false; 702 } 703 } 704 705 /* 706 * Returns whether the event notification should be forwarded. 707 */ 708 static bool xive_source_esb_trigger(XiveSource *xsrc, uint32_t srcno) 709 { 710 bool ret; 711 712 assert(srcno < xsrc->nr_irqs); 713 714 ret = xive_esb_trigger(&xsrc->status[srcno]); 715 716 if (xive_source_irq_is_lsi(xsrc, srcno) && 717 xive_source_esb_get(xsrc, srcno) == XIVE_ESB_QUEUED) { 718 qemu_log_mask(LOG_GUEST_ERROR, 719 "XIVE: queued an event on LSI IRQ %d\n", srcno); 720 } 721 722 return ret; 723 } 724 725 /* 726 * Returns whether the event notification should be forwarded. 727 */ 728 static bool xive_source_esb_eoi(XiveSource *xsrc, uint32_t srcno) 729 { 730 bool ret; 731 732 assert(srcno < xsrc->nr_irqs); 733 734 ret = xive_esb_eoi(&xsrc->status[srcno]); 735 736 /* 737 * LSI sources do not set the Q bit but they can still be 738 * asserted, in which case we should forward a new event 739 * notification 740 */ 741 if (xive_source_irq_is_lsi(xsrc, srcno) && 742 xsrc->status[srcno] & XIVE_STATUS_ASSERTED) { 743 ret = xive_source_lsi_trigger(xsrc, srcno); 744 } 745 746 return ret; 747 } 748 749 /* 750 * Forward the source event notification to the Router 751 */ 752 static void xive_source_notify(XiveSource *xsrc, int srcno) 753 { 754 XiveNotifierClass *xnc = XIVE_NOTIFIER_GET_CLASS(xsrc->xive); 755 756 if (xnc->notify) { 757 xnc->notify(xsrc->xive, srcno); 758 } 759 } 760 761 /* 762 * In a two pages ESB MMIO setting, even page is the trigger page, odd 763 * page is for management 764 */ 765 static inline bool addr_is_even(hwaddr addr, uint32_t shift) 766 { 767 return !((addr >> shift) & 1); 768 } 769 770 static inline bool xive_source_is_trigger_page(XiveSource *xsrc, hwaddr addr) 771 { 772 return xive_source_esb_has_2page(xsrc) && 773 addr_is_even(addr, xsrc->esb_shift - 1); 774 } 775 776 /* 777 * ESB MMIO loads 778 * Trigger page Management/EOI page 779 * 780 * ESB MMIO setting 2 pages 1 or 2 pages 781 * 782 * 0x000 .. 0x3FF -1 EOI and return 0|1 783 * 0x400 .. 0x7FF -1 EOI and return 0|1 784 * 0x800 .. 0xBFF -1 return PQ 785 * 0xC00 .. 0xCFF -1 return PQ and atomically PQ=00 786 * 0xD00 .. 0xDFF -1 return PQ and atomically PQ=01 787 * 0xE00 .. 0xDFF -1 return PQ and atomically PQ=10 788 * 0xF00 .. 0xDFF -1 return PQ and atomically PQ=11 789 */ 790 static uint64_t xive_source_esb_read(void *opaque, hwaddr addr, unsigned size) 791 { 792 XiveSource *xsrc = XIVE_SOURCE(opaque); 793 uint32_t offset = addr & 0xFFF; 794 uint32_t srcno = addr >> xsrc->esb_shift; 795 uint64_t ret = -1; 796 797 /* In a two pages ESB MMIO setting, trigger page should not be read */ 798 if (xive_source_is_trigger_page(xsrc, addr)) { 799 qemu_log_mask(LOG_GUEST_ERROR, 800 "XIVE: invalid load on IRQ %d trigger page at " 801 "0x%"HWADDR_PRIx"\n", srcno, addr); 802 return -1; 803 } 804 805 switch (offset) { 806 case XIVE_ESB_LOAD_EOI ... XIVE_ESB_LOAD_EOI + 0x7FF: 807 ret = xive_source_esb_eoi(xsrc, srcno); 808 809 /* Forward the source event notification for routing */ 810 if (ret) { 811 xive_source_notify(xsrc, srcno); 812 } 813 break; 814 815 case XIVE_ESB_GET ... XIVE_ESB_GET + 0x3FF: 816 ret = xive_source_esb_get(xsrc, srcno); 817 break; 818 819 case XIVE_ESB_SET_PQ_00 ... XIVE_ESB_SET_PQ_00 + 0x0FF: 820 case XIVE_ESB_SET_PQ_01 ... XIVE_ESB_SET_PQ_01 + 0x0FF: 821 case XIVE_ESB_SET_PQ_10 ... XIVE_ESB_SET_PQ_10 + 0x0FF: 822 case XIVE_ESB_SET_PQ_11 ... XIVE_ESB_SET_PQ_11 + 0x0FF: 823 ret = xive_source_esb_set(xsrc, srcno, (offset >> 8) & 0x3); 824 break; 825 default: 826 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid ESB load addr %x\n", 827 offset); 828 } 829 830 return ret; 831 } 832 833 /* 834 * ESB MMIO stores 835 * Trigger page Management/EOI page 836 * 837 * ESB MMIO setting 2 pages 1 or 2 pages 838 * 839 * 0x000 .. 0x3FF Trigger Trigger 840 * 0x400 .. 0x7FF Trigger EOI 841 * 0x800 .. 0xBFF Trigger undefined 842 * 0xC00 .. 0xCFF Trigger PQ=00 843 * 0xD00 .. 0xDFF Trigger PQ=01 844 * 0xE00 .. 0xDFF Trigger PQ=10 845 * 0xF00 .. 0xDFF Trigger PQ=11 846 */ 847 static void xive_source_esb_write(void *opaque, hwaddr addr, 848 uint64_t value, unsigned size) 849 { 850 XiveSource *xsrc = XIVE_SOURCE(opaque); 851 uint32_t offset = addr & 0xFFF; 852 uint32_t srcno = addr >> xsrc->esb_shift; 853 bool notify = false; 854 855 /* In a two pages ESB MMIO setting, trigger page only triggers */ 856 if (xive_source_is_trigger_page(xsrc, addr)) { 857 notify = xive_source_esb_trigger(xsrc, srcno); 858 goto out; 859 } 860 861 switch (offset) { 862 case 0 ... 0x3FF: 863 notify = xive_source_esb_trigger(xsrc, srcno); 864 break; 865 866 case XIVE_ESB_STORE_EOI ... XIVE_ESB_STORE_EOI + 0x3FF: 867 if (!(xsrc->esb_flags & XIVE_SRC_STORE_EOI)) { 868 qemu_log_mask(LOG_GUEST_ERROR, 869 "XIVE: invalid Store EOI for IRQ %d\n", srcno); 870 return; 871 } 872 873 notify = xive_source_esb_eoi(xsrc, srcno); 874 break; 875 876 case XIVE_ESB_SET_PQ_00 ... XIVE_ESB_SET_PQ_00 + 0x0FF: 877 case XIVE_ESB_SET_PQ_01 ... XIVE_ESB_SET_PQ_01 + 0x0FF: 878 case XIVE_ESB_SET_PQ_10 ... XIVE_ESB_SET_PQ_10 + 0x0FF: 879 case XIVE_ESB_SET_PQ_11 ... XIVE_ESB_SET_PQ_11 + 0x0FF: 880 xive_source_esb_set(xsrc, srcno, (offset >> 8) & 0x3); 881 break; 882 883 default: 884 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid ESB write addr %x\n", 885 offset); 886 return; 887 } 888 889 out: 890 /* Forward the source event notification for routing */ 891 if (notify) { 892 xive_source_notify(xsrc, srcno); 893 } 894 } 895 896 static const MemoryRegionOps xive_source_esb_ops = { 897 .read = xive_source_esb_read, 898 .write = xive_source_esb_write, 899 .endianness = DEVICE_BIG_ENDIAN, 900 .valid = { 901 .min_access_size = 8, 902 .max_access_size = 8, 903 }, 904 .impl = { 905 .min_access_size = 8, 906 .max_access_size = 8, 907 }, 908 }; 909 910 void xive_source_set_irq(void *opaque, int srcno, int val) 911 { 912 XiveSource *xsrc = XIVE_SOURCE(opaque); 913 bool notify = false; 914 915 if (xive_source_irq_is_lsi(xsrc, srcno)) { 916 if (val) { 917 notify = xive_source_lsi_trigger(xsrc, srcno); 918 } else { 919 xsrc->status[srcno] &= ~XIVE_STATUS_ASSERTED; 920 } 921 } else { 922 if (val) { 923 notify = xive_source_esb_trigger(xsrc, srcno); 924 } 925 } 926 927 /* Forward the source event notification for routing */ 928 if (notify) { 929 xive_source_notify(xsrc, srcno); 930 } 931 } 932 933 void xive_source_pic_print_info(XiveSource *xsrc, uint32_t offset, Monitor *mon) 934 { 935 int i; 936 937 for (i = 0; i < xsrc->nr_irqs; i++) { 938 uint8_t pq = xive_source_esb_get(xsrc, i); 939 940 if (pq == XIVE_ESB_OFF) { 941 continue; 942 } 943 944 monitor_printf(mon, " %08x %s %c%c%c\n", i + offset, 945 xive_source_irq_is_lsi(xsrc, i) ? "LSI" : "MSI", 946 pq & XIVE_ESB_VAL_P ? 'P' : '-', 947 pq & XIVE_ESB_VAL_Q ? 'Q' : '-', 948 xsrc->status[i] & XIVE_STATUS_ASSERTED ? 'A' : ' '); 949 } 950 } 951 952 static void xive_source_reset(void *dev) 953 { 954 XiveSource *xsrc = XIVE_SOURCE(dev); 955 956 /* Do not clear the LSI bitmap */ 957 958 /* PQs are initialized to 0b01 (Q=1) which corresponds to "ints off" */ 959 memset(xsrc->status, XIVE_ESB_OFF, xsrc->nr_irqs); 960 } 961 962 static void xive_source_realize(DeviceState *dev, Error **errp) 963 { 964 XiveSource *xsrc = XIVE_SOURCE(dev); 965 Object *obj; 966 Error *local_err = NULL; 967 968 obj = object_property_get_link(OBJECT(dev), "xive", &local_err); 969 if (!obj) { 970 error_propagate(errp, local_err); 971 error_prepend(errp, "required link 'xive' not found: "); 972 return; 973 } 974 975 xsrc->xive = XIVE_NOTIFIER(obj); 976 977 if (!xsrc->nr_irqs) { 978 error_setg(errp, "Number of interrupt needs to be greater than 0"); 979 return; 980 } 981 982 if (xsrc->esb_shift != XIVE_ESB_4K && 983 xsrc->esb_shift != XIVE_ESB_4K_2PAGE && 984 xsrc->esb_shift != XIVE_ESB_64K && 985 xsrc->esb_shift != XIVE_ESB_64K_2PAGE) { 986 error_setg(errp, "Invalid ESB shift setting"); 987 return; 988 } 989 990 xsrc->status = g_malloc0(xsrc->nr_irqs); 991 xsrc->lsi_map = bitmap_new(xsrc->nr_irqs); 992 993 memory_region_init_io(&xsrc->esb_mmio, OBJECT(xsrc), 994 &xive_source_esb_ops, xsrc, "xive.esb", 995 (1ull << xsrc->esb_shift) * xsrc->nr_irqs); 996 997 qemu_register_reset(xive_source_reset, dev); 998 } 999 1000 static const VMStateDescription vmstate_xive_source = { 1001 .name = TYPE_XIVE_SOURCE, 1002 .version_id = 1, 1003 .minimum_version_id = 1, 1004 .fields = (VMStateField[]) { 1005 VMSTATE_UINT32_EQUAL(nr_irqs, XiveSource, NULL), 1006 VMSTATE_VBUFFER_UINT32(status, XiveSource, 1, NULL, nr_irqs), 1007 VMSTATE_END_OF_LIST() 1008 }, 1009 }; 1010 1011 /* 1012 * The default XIVE interrupt source setting for the ESB MMIOs is two 1013 * 64k pages without Store EOI, to be in sync with KVM. 1014 */ 1015 static Property xive_source_properties[] = { 1016 DEFINE_PROP_UINT64("flags", XiveSource, esb_flags, 0), 1017 DEFINE_PROP_UINT32("nr-irqs", XiveSource, nr_irqs, 0), 1018 DEFINE_PROP_UINT32("shift", XiveSource, esb_shift, XIVE_ESB_64K_2PAGE), 1019 DEFINE_PROP_END_OF_LIST(), 1020 }; 1021 1022 static void xive_source_class_init(ObjectClass *klass, void *data) 1023 { 1024 DeviceClass *dc = DEVICE_CLASS(klass); 1025 1026 dc->desc = "XIVE Interrupt Source"; 1027 dc->props = xive_source_properties; 1028 dc->realize = xive_source_realize; 1029 dc->vmsd = &vmstate_xive_source; 1030 } 1031 1032 static const TypeInfo xive_source_info = { 1033 .name = TYPE_XIVE_SOURCE, 1034 .parent = TYPE_DEVICE, 1035 .instance_size = sizeof(XiveSource), 1036 .class_init = xive_source_class_init, 1037 }; 1038 1039 /* 1040 * XiveEND helpers 1041 */ 1042 1043 void xive_end_queue_pic_print_info(XiveEND *end, uint32_t width, Monitor *mon) 1044 { 1045 uint64_t qaddr_base = xive_end_qaddr(end); 1046 uint32_t qsize = xive_get_field32(END_W0_QSIZE, end->w0); 1047 uint32_t qindex = xive_get_field32(END_W1_PAGE_OFF, end->w1); 1048 uint32_t qentries = 1 << (qsize + 10); 1049 int i; 1050 1051 /* 1052 * print out the [ (qindex - (width - 1)) .. (qindex + 1)] window 1053 */ 1054 monitor_printf(mon, " [ "); 1055 qindex = (qindex - (width - 1)) & (qentries - 1); 1056 for (i = 0; i < width; i++) { 1057 uint64_t qaddr = qaddr_base + (qindex << 2); 1058 uint32_t qdata = -1; 1059 1060 if (dma_memory_read(&address_space_memory, qaddr, &qdata, 1061 sizeof(qdata))) { 1062 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: failed to read EQ @0x%" 1063 HWADDR_PRIx "\n", qaddr); 1064 return; 1065 } 1066 monitor_printf(mon, "%s%08x ", i == width - 1 ? "^" : "", 1067 be32_to_cpu(qdata)); 1068 qindex = (qindex + 1) & (qentries - 1); 1069 } 1070 } 1071 1072 void xive_end_pic_print_info(XiveEND *end, uint32_t end_idx, Monitor *mon) 1073 { 1074 uint64_t qaddr_base = xive_end_qaddr(end); 1075 uint32_t qindex = xive_get_field32(END_W1_PAGE_OFF, end->w1); 1076 uint32_t qgen = xive_get_field32(END_W1_GENERATION, end->w1); 1077 uint32_t qsize = xive_get_field32(END_W0_QSIZE, end->w0); 1078 uint32_t qentries = 1 << (qsize + 10); 1079 1080 uint32_t nvt = xive_get_field32(END_W6_NVT_INDEX, end->w6); 1081 uint8_t priority = xive_get_field32(END_W7_F0_PRIORITY, end->w7); 1082 1083 if (!xive_end_is_valid(end)) { 1084 return; 1085 } 1086 1087 monitor_printf(mon, " %08x %c%c%c%c%c prio:%d nvt:%04x eq:@%08"PRIx64 1088 "% 6d/%5d ^%d", end_idx, 1089 xive_end_is_valid(end) ? 'v' : '-', 1090 xive_end_is_enqueue(end) ? 'q' : '-', 1091 xive_end_is_notify(end) ? 'n' : '-', 1092 xive_end_is_backlog(end) ? 'b' : '-', 1093 xive_end_is_escalate(end) ? 'e' : '-', 1094 priority, nvt, qaddr_base, qindex, qentries, qgen); 1095 1096 xive_end_queue_pic_print_info(end, 6, mon); 1097 monitor_printf(mon, "]\n"); 1098 } 1099 1100 static void xive_end_enqueue(XiveEND *end, uint32_t data) 1101 { 1102 uint64_t qaddr_base = xive_end_qaddr(end); 1103 uint32_t qsize = xive_get_field32(END_W0_QSIZE, end->w0); 1104 uint32_t qindex = xive_get_field32(END_W1_PAGE_OFF, end->w1); 1105 uint32_t qgen = xive_get_field32(END_W1_GENERATION, end->w1); 1106 1107 uint64_t qaddr = qaddr_base + (qindex << 2); 1108 uint32_t qdata = cpu_to_be32((qgen << 31) | (data & 0x7fffffff)); 1109 uint32_t qentries = 1 << (qsize + 10); 1110 1111 if (dma_memory_write(&address_space_memory, qaddr, &qdata, sizeof(qdata))) { 1112 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: failed to write END data @0x%" 1113 HWADDR_PRIx "\n", qaddr); 1114 return; 1115 } 1116 1117 qindex = (qindex + 1) & (qentries - 1); 1118 if (qindex == 0) { 1119 qgen ^= 1; 1120 end->w1 = xive_set_field32(END_W1_GENERATION, end->w1, qgen); 1121 } 1122 end->w1 = xive_set_field32(END_W1_PAGE_OFF, end->w1, qindex); 1123 } 1124 1125 /* 1126 * XIVE Router (aka. Virtualization Controller or IVRE) 1127 */ 1128 1129 int xive_router_get_eas(XiveRouter *xrtr, uint8_t eas_blk, uint32_t eas_idx, 1130 XiveEAS *eas) 1131 { 1132 XiveRouterClass *xrc = XIVE_ROUTER_GET_CLASS(xrtr); 1133 1134 return xrc->get_eas(xrtr, eas_blk, eas_idx, eas); 1135 } 1136 1137 int xive_router_get_end(XiveRouter *xrtr, uint8_t end_blk, uint32_t end_idx, 1138 XiveEND *end) 1139 { 1140 XiveRouterClass *xrc = XIVE_ROUTER_GET_CLASS(xrtr); 1141 1142 return xrc->get_end(xrtr, end_blk, end_idx, end); 1143 } 1144 1145 int xive_router_write_end(XiveRouter *xrtr, uint8_t end_blk, uint32_t end_idx, 1146 XiveEND *end, uint8_t word_number) 1147 { 1148 XiveRouterClass *xrc = XIVE_ROUTER_GET_CLASS(xrtr); 1149 1150 return xrc->write_end(xrtr, end_blk, end_idx, end, word_number); 1151 } 1152 1153 int xive_router_get_nvt(XiveRouter *xrtr, uint8_t nvt_blk, uint32_t nvt_idx, 1154 XiveNVT *nvt) 1155 { 1156 XiveRouterClass *xrc = XIVE_ROUTER_GET_CLASS(xrtr); 1157 1158 return xrc->get_nvt(xrtr, nvt_blk, nvt_idx, nvt); 1159 } 1160 1161 int xive_router_write_nvt(XiveRouter *xrtr, uint8_t nvt_blk, uint32_t nvt_idx, 1162 XiveNVT *nvt, uint8_t word_number) 1163 { 1164 XiveRouterClass *xrc = XIVE_ROUTER_GET_CLASS(xrtr); 1165 1166 return xrc->write_nvt(xrtr, nvt_blk, nvt_idx, nvt, word_number); 1167 } 1168 1169 XiveTCTX *xive_router_get_tctx(XiveRouter *xrtr, CPUState *cs) 1170 { 1171 XiveRouterClass *xrc = XIVE_ROUTER_GET_CLASS(xrtr); 1172 1173 return xrc->get_tctx(xrtr, cs); 1174 } 1175 1176 /* 1177 * By default on P9, the HW CAM line (23bits) is hardwired to : 1178 * 1179 * 0x000||0b1||4Bit chip number||7Bit Thread number. 1180 * 1181 * When the block grouping is enabled, the CAM line is changed to : 1182 * 1183 * 4Bit chip number||0x001||7Bit Thread number. 1184 */ 1185 static uint32_t hw_cam_line(uint8_t chip_id, uint8_t tid) 1186 { 1187 return 1 << 11 | (chip_id & 0xf) << 7 | (tid & 0x7f); 1188 } 1189 1190 static bool xive_presenter_tctx_match_hw(XiveTCTX *tctx, 1191 uint8_t nvt_blk, uint32_t nvt_idx) 1192 { 1193 CPUPPCState *env = &POWERPC_CPU(tctx->cs)->env; 1194 uint32_t pir = env->spr_cb[SPR_PIR].default_value; 1195 1196 return hw_cam_line((pir >> 8) & 0xf, pir & 0x7f) == 1197 hw_cam_line(nvt_blk, nvt_idx); 1198 } 1199 1200 /* 1201 * The thread context register words are in big-endian format. 1202 */ 1203 static int xive_presenter_tctx_match(XiveTCTX *tctx, uint8_t format, 1204 uint8_t nvt_blk, uint32_t nvt_idx, 1205 bool cam_ignore, uint32_t logic_serv) 1206 { 1207 uint32_t cam = xive_nvt_cam_line(nvt_blk, nvt_idx); 1208 uint32_t qw3w2 = xive_tctx_word2(&tctx->regs[TM_QW3_HV_PHYS]); 1209 uint32_t qw2w2 = xive_tctx_word2(&tctx->regs[TM_QW2_HV_POOL]); 1210 uint32_t qw1w2 = xive_tctx_word2(&tctx->regs[TM_QW1_OS]); 1211 uint32_t qw0w2 = xive_tctx_word2(&tctx->regs[TM_QW0_USER]); 1212 1213 /* 1214 * TODO (PowerNV): ignore mode. The low order bits of the NVT 1215 * identifier are ignored in the "CAM" match. 1216 */ 1217 1218 if (format == 0) { 1219 if (cam_ignore == true) { 1220 /* 1221 * F=0 & i=1: Logical server notification (bits ignored at 1222 * the end of the NVT identifier) 1223 */ 1224 qemu_log_mask(LOG_UNIMP, "XIVE: no support for LS NVT %x/%x\n", 1225 nvt_blk, nvt_idx); 1226 return -1; 1227 } 1228 1229 /* F=0 & i=0: Specific NVT notification */ 1230 1231 /* PHYS ring */ 1232 if ((be32_to_cpu(qw3w2) & TM_QW3W2_VT) && 1233 xive_presenter_tctx_match_hw(tctx, nvt_blk, nvt_idx)) { 1234 return TM_QW3_HV_PHYS; 1235 } 1236 1237 /* HV POOL ring */ 1238 if ((be32_to_cpu(qw2w2) & TM_QW2W2_VP) && 1239 cam == xive_get_field32(TM_QW2W2_POOL_CAM, qw2w2)) { 1240 return TM_QW2_HV_POOL; 1241 } 1242 1243 /* OS ring */ 1244 if ((be32_to_cpu(qw1w2) & TM_QW1W2_VO) && 1245 cam == xive_get_field32(TM_QW1W2_OS_CAM, qw1w2)) { 1246 return TM_QW1_OS; 1247 } 1248 } else { 1249 /* F=1 : User level Event-Based Branch (EBB) notification */ 1250 1251 /* USER ring */ 1252 if ((be32_to_cpu(qw1w2) & TM_QW1W2_VO) && 1253 (cam == xive_get_field32(TM_QW1W2_OS_CAM, qw1w2)) && 1254 (be32_to_cpu(qw0w2) & TM_QW0W2_VU) && 1255 (logic_serv == xive_get_field32(TM_QW0W2_LOGIC_SERV, qw0w2))) { 1256 return TM_QW0_USER; 1257 } 1258 } 1259 return -1; 1260 } 1261 1262 typedef struct XiveTCTXMatch { 1263 XiveTCTX *tctx; 1264 uint8_t ring; 1265 } XiveTCTXMatch; 1266 1267 static bool xive_presenter_match(XiveRouter *xrtr, uint8_t format, 1268 uint8_t nvt_blk, uint32_t nvt_idx, 1269 bool cam_ignore, uint8_t priority, 1270 uint32_t logic_serv, XiveTCTXMatch *match) 1271 { 1272 CPUState *cs; 1273 1274 /* 1275 * TODO (PowerNV): handle chip_id overwrite of block field for 1276 * hardwired CAM compares 1277 */ 1278 1279 CPU_FOREACH(cs) { 1280 XiveTCTX *tctx = xive_router_get_tctx(xrtr, cs); 1281 int ring; 1282 1283 /* 1284 * HW checks that the CPU is enabled in the Physical Thread 1285 * Enable Register (PTER). 1286 */ 1287 1288 /* 1289 * Check the thread context CAM lines and record matches. We 1290 * will handle CPU exception delivery later 1291 */ 1292 ring = xive_presenter_tctx_match(tctx, format, nvt_blk, nvt_idx, 1293 cam_ignore, logic_serv); 1294 /* 1295 * Save the context and follow on to catch duplicates, that we 1296 * don't support yet. 1297 */ 1298 if (ring != -1) { 1299 if (match->tctx) { 1300 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: already found a thread " 1301 "context NVT %x/%x\n", nvt_blk, nvt_idx); 1302 return false; 1303 } 1304 1305 match->ring = ring; 1306 match->tctx = tctx; 1307 } 1308 } 1309 1310 if (!match->tctx) { 1311 qemu_log_mask(LOG_UNIMP, "XIVE: NVT %x/%x is not dispatched\n", 1312 nvt_blk, nvt_idx); 1313 return false; 1314 } 1315 1316 return true; 1317 } 1318 1319 /* 1320 * This is our simple Xive Presenter Engine model. It is merged in the 1321 * Router as it does not require an extra object. 1322 * 1323 * It receives notification requests sent by the IVRE to find one 1324 * matching NVT (or more) dispatched on the processor threads. In case 1325 * of a single NVT notification, the process is abreviated and the 1326 * thread is signaled if a match is found. In case of a logical server 1327 * notification (bits ignored at the end of the NVT identifier), the 1328 * IVPE and IVRE select a winning thread using different filters. This 1329 * involves 2 or 3 exchanges on the PowerBus that the model does not 1330 * support. 1331 * 1332 * The parameters represent what is sent on the PowerBus 1333 */ 1334 static void xive_presenter_notify(XiveRouter *xrtr, uint8_t format, 1335 uint8_t nvt_blk, uint32_t nvt_idx, 1336 bool cam_ignore, uint8_t priority, 1337 uint32_t logic_serv) 1338 { 1339 XiveNVT nvt; 1340 XiveTCTXMatch match = { .tctx = NULL, .ring = 0 }; 1341 bool found; 1342 1343 /* NVT cache lookup */ 1344 if (xive_router_get_nvt(xrtr, nvt_blk, nvt_idx, &nvt)) { 1345 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: no NVT %x/%x\n", 1346 nvt_blk, nvt_idx); 1347 return; 1348 } 1349 1350 if (!xive_nvt_is_valid(&nvt)) { 1351 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: NVT %x/%x is invalid\n", 1352 nvt_blk, nvt_idx); 1353 return; 1354 } 1355 1356 found = xive_presenter_match(xrtr, format, nvt_blk, nvt_idx, cam_ignore, 1357 priority, logic_serv, &match); 1358 if (found) { 1359 ipb_update(&match.tctx->regs[match.ring], priority); 1360 xive_tctx_notify(match.tctx, match.ring); 1361 return; 1362 } 1363 1364 /* Record the IPB in the associated NVT structure */ 1365 ipb_update((uint8_t *) &nvt.w4, priority); 1366 xive_router_write_nvt(xrtr, nvt_blk, nvt_idx, &nvt, 4); 1367 1368 /* 1369 * If no matching NVT is dispatched on a HW thread : 1370 * - update the NVT structure if backlog is activated 1371 * - escalate (ESe PQ bits and EAS in w4-5) if escalation is 1372 * activated 1373 */ 1374 } 1375 1376 /* 1377 * An END trigger can come from an event trigger (IPI or HW) or from 1378 * another chip. We don't model the PowerBus but the END trigger 1379 * message has the same parameters than in the function below. 1380 */ 1381 static void xive_router_end_notify(XiveRouter *xrtr, uint8_t end_blk, 1382 uint32_t end_idx, uint32_t end_data) 1383 { 1384 XiveEND end; 1385 uint8_t priority; 1386 uint8_t format; 1387 1388 /* END cache lookup */ 1389 if (xive_router_get_end(xrtr, end_blk, end_idx, &end)) { 1390 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: No END %x/%x\n", end_blk, 1391 end_idx); 1392 return; 1393 } 1394 1395 if (!xive_end_is_valid(&end)) { 1396 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: END %x/%x is invalid\n", 1397 end_blk, end_idx); 1398 return; 1399 } 1400 1401 if (xive_end_is_enqueue(&end)) { 1402 xive_end_enqueue(&end, end_data); 1403 /* Enqueuing event data modifies the EQ toggle and index */ 1404 xive_router_write_end(xrtr, end_blk, end_idx, &end, 1); 1405 } 1406 1407 /* 1408 * The W7 format depends on the F bit in W6. It defines the type 1409 * of the notification : 1410 * 1411 * F=0 : single or multiple NVT notification 1412 * F=1 : User level Event-Based Branch (EBB) notification, no 1413 * priority 1414 */ 1415 format = xive_get_field32(END_W6_FORMAT_BIT, end.w6); 1416 priority = xive_get_field32(END_W7_F0_PRIORITY, end.w7); 1417 1418 /* The END is masked */ 1419 if (format == 0 && priority == 0xff) { 1420 return; 1421 } 1422 1423 /* 1424 * Check the END ESn (Event State Buffer for notification) for 1425 * even futher coalescing in the Router 1426 */ 1427 if (!xive_end_is_notify(&end)) { 1428 uint8_t pq = xive_get_field32(END_W1_ESn, end.w1); 1429 bool notify = xive_esb_trigger(&pq); 1430 1431 if (pq != xive_get_field32(END_W1_ESn, end.w1)) { 1432 end.w1 = xive_set_field32(END_W1_ESn, end.w1, pq); 1433 xive_router_write_end(xrtr, end_blk, end_idx, &end, 1); 1434 } 1435 1436 /* ESn[Q]=1 : end of notification */ 1437 if (!notify) { 1438 return; 1439 } 1440 } 1441 1442 /* 1443 * Follows IVPE notification 1444 */ 1445 xive_presenter_notify(xrtr, format, 1446 xive_get_field32(END_W6_NVT_BLOCK, end.w6), 1447 xive_get_field32(END_W6_NVT_INDEX, end.w6), 1448 xive_get_field32(END_W7_F0_IGNORE, end.w7), 1449 priority, 1450 xive_get_field32(END_W7_F1_LOG_SERVER_ID, end.w7)); 1451 1452 /* TODO: Auto EOI. */ 1453 } 1454 1455 void xive_router_notify(XiveNotifier *xn, uint32_t lisn) 1456 { 1457 XiveRouter *xrtr = XIVE_ROUTER(xn); 1458 uint8_t eas_blk = XIVE_SRCNO_BLOCK(lisn); 1459 uint32_t eas_idx = XIVE_SRCNO_INDEX(lisn); 1460 XiveEAS eas; 1461 1462 /* EAS cache lookup */ 1463 if (xive_router_get_eas(xrtr, eas_blk, eas_idx, &eas)) { 1464 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: Unknown LISN %x\n", lisn); 1465 return; 1466 } 1467 1468 /* 1469 * The IVRE checks the State Bit Cache at this point. We skip the 1470 * SBC lookup because the state bits of the sources are modeled 1471 * internally in QEMU. 1472 */ 1473 1474 if (!xive_eas_is_valid(&eas)) { 1475 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid LISN %x\n", lisn); 1476 return; 1477 } 1478 1479 if (xive_eas_is_masked(&eas)) { 1480 /* Notification completed */ 1481 return; 1482 } 1483 1484 /* 1485 * The event trigger becomes an END trigger 1486 */ 1487 xive_router_end_notify(xrtr, 1488 xive_get_field64(EAS_END_BLOCK, eas.w), 1489 xive_get_field64(EAS_END_INDEX, eas.w), 1490 xive_get_field64(EAS_END_DATA, eas.w)); 1491 } 1492 1493 static void xive_router_class_init(ObjectClass *klass, void *data) 1494 { 1495 DeviceClass *dc = DEVICE_CLASS(klass); 1496 XiveNotifierClass *xnc = XIVE_NOTIFIER_CLASS(klass); 1497 1498 dc->desc = "XIVE Router Engine"; 1499 xnc->notify = xive_router_notify; 1500 } 1501 1502 static const TypeInfo xive_router_info = { 1503 .name = TYPE_XIVE_ROUTER, 1504 .parent = TYPE_SYS_BUS_DEVICE, 1505 .abstract = true, 1506 .class_size = sizeof(XiveRouterClass), 1507 .class_init = xive_router_class_init, 1508 .interfaces = (InterfaceInfo[]) { 1509 { TYPE_XIVE_NOTIFIER }, 1510 { } 1511 } 1512 }; 1513 1514 void xive_eas_pic_print_info(XiveEAS *eas, uint32_t lisn, Monitor *mon) 1515 { 1516 if (!xive_eas_is_valid(eas)) { 1517 return; 1518 } 1519 1520 monitor_printf(mon, " %08x %s end:%02x/%04x data:%08x\n", 1521 lisn, xive_eas_is_masked(eas) ? "M" : " ", 1522 (uint8_t) xive_get_field64(EAS_END_BLOCK, eas->w), 1523 (uint32_t) xive_get_field64(EAS_END_INDEX, eas->w), 1524 (uint32_t) xive_get_field64(EAS_END_DATA, eas->w)); 1525 } 1526 1527 /* 1528 * END ESB MMIO loads 1529 */ 1530 static uint64_t xive_end_source_read(void *opaque, hwaddr addr, unsigned size) 1531 { 1532 XiveENDSource *xsrc = XIVE_END_SOURCE(opaque); 1533 uint32_t offset = addr & 0xFFF; 1534 uint8_t end_blk; 1535 uint32_t end_idx; 1536 XiveEND end; 1537 uint32_t end_esmask; 1538 uint8_t pq; 1539 uint64_t ret = -1; 1540 1541 end_blk = xsrc->block_id; 1542 end_idx = addr >> (xsrc->esb_shift + 1); 1543 1544 if (xive_router_get_end(xsrc->xrtr, end_blk, end_idx, &end)) { 1545 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: No END %x/%x\n", end_blk, 1546 end_idx); 1547 return -1; 1548 } 1549 1550 if (!xive_end_is_valid(&end)) { 1551 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: END %x/%x is invalid\n", 1552 end_blk, end_idx); 1553 return -1; 1554 } 1555 1556 end_esmask = addr_is_even(addr, xsrc->esb_shift) ? END_W1_ESn : END_W1_ESe; 1557 pq = xive_get_field32(end_esmask, end.w1); 1558 1559 switch (offset) { 1560 case XIVE_ESB_LOAD_EOI ... XIVE_ESB_LOAD_EOI + 0x7FF: 1561 ret = xive_esb_eoi(&pq); 1562 1563 /* Forward the source event notification for routing ?? */ 1564 break; 1565 1566 case XIVE_ESB_GET ... XIVE_ESB_GET + 0x3FF: 1567 ret = pq; 1568 break; 1569 1570 case XIVE_ESB_SET_PQ_00 ... XIVE_ESB_SET_PQ_00 + 0x0FF: 1571 case XIVE_ESB_SET_PQ_01 ... XIVE_ESB_SET_PQ_01 + 0x0FF: 1572 case XIVE_ESB_SET_PQ_10 ... XIVE_ESB_SET_PQ_10 + 0x0FF: 1573 case XIVE_ESB_SET_PQ_11 ... XIVE_ESB_SET_PQ_11 + 0x0FF: 1574 ret = xive_esb_set(&pq, (offset >> 8) & 0x3); 1575 break; 1576 default: 1577 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid END ESB load addr %d\n", 1578 offset); 1579 return -1; 1580 } 1581 1582 if (pq != xive_get_field32(end_esmask, end.w1)) { 1583 end.w1 = xive_set_field32(end_esmask, end.w1, pq); 1584 xive_router_write_end(xsrc->xrtr, end_blk, end_idx, &end, 1); 1585 } 1586 1587 return ret; 1588 } 1589 1590 /* 1591 * END ESB MMIO stores are invalid 1592 */ 1593 static void xive_end_source_write(void *opaque, hwaddr addr, 1594 uint64_t value, unsigned size) 1595 { 1596 qemu_log_mask(LOG_GUEST_ERROR, "XIVE: invalid ESB write addr 0x%" 1597 HWADDR_PRIx"\n", addr); 1598 } 1599 1600 static const MemoryRegionOps xive_end_source_ops = { 1601 .read = xive_end_source_read, 1602 .write = xive_end_source_write, 1603 .endianness = DEVICE_BIG_ENDIAN, 1604 .valid = { 1605 .min_access_size = 8, 1606 .max_access_size = 8, 1607 }, 1608 .impl = { 1609 .min_access_size = 8, 1610 .max_access_size = 8, 1611 }, 1612 }; 1613 1614 static void xive_end_source_realize(DeviceState *dev, Error **errp) 1615 { 1616 XiveENDSource *xsrc = XIVE_END_SOURCE(dev); 1617 Object *obj; 1618 Error *local_err = NULL; 1619 1620 obj = object_property_get_link(OBJECT(dev), "xive", &local_err); 1621 if (!obj) { 1622 error_propagate(errp, local_err); 1623 error_prepend(errp, "required link 'xive' not found: "); 1624 return; 1625 } 1626 1627 xsrc->xrtr = XIVE_ROUTER(obj); 1628 1629 if (!xsrc->nr_ends) { 1630 error_setg(errp, "Number of interrupt needs to be greater than 0"); 1631 return; 1632 } 1633 1634 if (xsrc->esb_shift != XIVE_ESB_4K && 1635 xsrc->esb_shift != XIVE_ESB_64K) { 1636 error_setg(errp, "Invalid ESB shift setting"); 1637 return; 1638 } 1639 1640 /* 1641 * Each END is assigned an even/odd pair of MMIO pages, the even page 1642 * manages the ESn field while the odd page manages the ESe field. 1643 */ 1644 memory_region_init_io(&xsrc->esb_mmio, OBJECT(xsrc), 1645 &xive_end_source_ops, xsrc, "xive.end", 1646 (1ull << (xsrc->esb_shift + 1)) * xsrc->nr_ends); 1647 } 1648 1649 static Property xive_end_source_properties[] = { 1650 DEFINE_PROP_UINT8("block-id", XiveENDSource, block_id, 0), 1651 DEFINE_PROP_UINT32("nr-ends", XiveENDSource, nr_ends, 0), 1652 DEFINE_PROP_UINT32("shift", XiveENDSource, esb_shift, XIVE_ESB_64K), 1653 DEFINE_PROP_END_OF_LIST(), 1654 }; 1655 1656 static void xive_end_source_class_init(ObjectClass *klass, void *data) 1657 { 1658 DeviceClass *dc = DEVICE_CLASS(klass); 1659 1660 dc->desc = "XIVE END Source"; 1661 dc->props = xive_end_source_properties; 1662 dc->realize = xive_end_source_realize; 1663 } 1664 1665 static const TypeInfo xive_end_source_info = { 1666 .name = TYPE_XIVE_END_SOURCE, 1667 .parent = TYPE_DEVICE, 1668 .instance_size = sizeof(XiveENDSource), 1669 .class_init = xive_end_source_class_init, 1670 }; 1671 1672 /* 1673 * XIVE Notifier 1674 */ 1675 static const TypeInfo xive_notifier_info = { 1676 .name = TYPE_XIVE_NOTIFIER, 1677 .parent = TYPE_INTERFACE, 1678 .class_size = sizeof(XiveNotifierClass), 1679 }; 1680 1681 static void xive_register_types(void) 1682 { 1683 type_register_static(&xive_source_info); 1684 type_register_static(&xive_notifier_info); 1685 type_register_static(&xive_router_info); 1686 type_register_static(&xive_end_source_info); 1687 type_register_static(&xive_tctx_info); 1688 } 1689 1690 type_init(xive_register_types) 1691