Jeenu Viswambharan | 04e3a7f | 2017-10-16 08:43:14 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <arch_helpers.h> |
| 8 | #include <assert.h> |
| 9 | #include <bl31.h> |
| 10 | #include <bl_common.h> |
| 11 | #include <cassert.h> |
| 12 | #include <context.h> |
| 13 | #include <context_mgmt.h> |
| 14 | #include <debug.h> |
| 15 | #include <ehf.h> |
| 16 | #include <interrupt_mgmt.h> |
| 17 | #include <platform.h> |
| 18 | #include <pubsub.h> |
| 19 | #include <runtime_svc.h> |
| 20 | #include <sdei.h> |
| 21 | #include <stddef.h> |
| 22 | #include <string.h> |
| 23 | #include <utils.h> |
| 24 | #include "sdei_private.h" |
| 25 | |
| 26 | #define MAJOR_VERSION 1 |
| 27 | #define MINOR_VERSION 0 |
| 28 | #define VENDOR_VERSION 0 |
| 29 | |
| 30 | #define MAKE_SDEI_VERSION(_major, _minor, _vendor) \ |
| 31 | ((((unsigned long long)(_major)) << 48) | \ |
| 32 | (((unsigned long long)(_minor)) << 32) | \ |
| 33 | (_vendor)) |
| 34 | |
| 35 | #define LOWEST_INTR_PRIORITY 0xff |
| 36 | |
| 37 | #define is_valid_affinity(_mpidr) (plat_core_pos_by_mpidr(_mpidr) >= 0) |
| 38 | |
| 39 | CASSERT(PLAT_SDEI_CRITICAL_PRI < PLAT_SDEI_NORMAL_PRI, |
| 40 | sdei_critical_must_have_higher_priority); |
| 41 | |
| 42 | static unsigned int num_dyn_priv_slots, num_dyn_shrd_slots; |
| 43 | |
| 44 | /* Initialise SDEI map entries */ |
| 45 | static void init_map(sdei_ev_map_t *map) |
| 46 | { |
| 47 | map->reg_count = 0; |
| 48 | } |
| 49 | |
| 50 | /* Convert mapping to SDEI class */ |
| 51 | sdei_class_t map_to_class(sdei_ev_map_t *map) |
| 52 | { |
| 53 | return is_event_critical(map) ? SDEI_CRITICAL : SDEI_NORMAL; |
| 54 | } |
| 55 | |
| 56 | /* Clear SDEI event entries except state */ |
| 57 | static void clear_event_entries(sdei_entry_t *se) |
| 58 | { |
| 59 | se->ep = 0; |
| 60 | se->arg = 0; |
| 61 | se->affinity = 0; |
| 62 | se->reg_flags = 0; |
| 63 | } |
| 64 | |
| 65 | /* Perform CPU-specific state initialisation */ |
| 66 | static void *sdei_cpu_on_init(const void *arg) |
| 67 | { |
| 68 | int i; |
| 69 | sdei_ev_map_t *map; |
| 70 | sdei_entry_t *se; |
| 71 | |
| 72 | /* Initialize private mappings on this CPU */ |
| 73 | for_each_private_map(i, map) { |
| 74 | se = get_event_entry(map); |
| 75 | clear_event_entries(se); |
| 76 | se->state = 0; |
| 77 | } |
| 78 | |
| 79 | SDEI_LOG("Private events initialized on %lx\n", read_mpidr_el1()); |
| 80 | |
| 81 | /* All PEs start with SDEI events masked */ |
| 82 | sdei_pe_mask(); |
| 83 | |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | /* Initialise an SDEI class */ |
| 88 | void sdei_class_init(sdei_class_t class) |
| 89 | { |
| 90 | unsigned int i, zero_found __unused = 0; |
| 91 | int ev_num_so_far __unused; |
| 92 | sdei_ev_map_t *map; |
| 93 | |
| 94 | /* Sanity check and configuration of shared events */ |
| 95 | ev_num_so_far = -1; |
| 96 | for_each_shared_map(i, map) { |
| 97 | #if ENABLE_ASSERTIONS |
| 98 | /* Ensure mappings are sorted */ |
| 99 | assert((ev_num_so_far < 0) || (map->ev_num > ev_num_so_far)); |
| 100 | |
| 101 | ev_num_so_far = map->ev_num; |
| 102 | |
| 103 | /* Event 0 must not be shared */ |
| 104 | assert(map->ev_num != SDEI_EVENT_0); |
| 105 | |
| 106 | /* Check for valid event */ |
| 107 | assert(map->ev_num >= 0); |
| 108 | |
| 109 | /* Make sure it's a shared event */ |
| 110 | assert(is_event_shared(map)); |
| 111 | |
| 112 | /* No shared mapping should have signalable property */ |
| 113 | assert(!is_event_signalable(map)); |
| 114 | #endif |
| 115 | |
| 116 | /* Skip initializing the wrong priority */ |
| 117 | if (map_to_class(map) != class) |
| 118 | continue; |
| 119 | |
| 120 | /* Platform events are always bound, so set the bound flag */ |
| 121 | if (is_map_dynamic(map)) { |
| 122 | assert(map->intr == SDEI_DYN_IRQ); |
| 123 | num_dyn_shrd_slots++; |
| 124 | } else { |
| 125 | /* Shared mappings must be bound to shared interrupt */ |
| 126 | assert(plat_ic_is_spi(map->intr)); |
| 127 | set_map_bound(map); |
| 128 | } |
| 129 | |
| 130 | init_map(map); |
| 131 | } |
| 132 | |
| 133 | /* Sanity check and configuration of private events for this CPU */ |
| 134 | ev_num_so_far = -1; |
| 135 | for_each_private_map(i, map) { |
| 136 | #if ENABLE_ASSERTIONS |
| 137 | /* Ensure mappings are sorted */ |
| 138 | assert((ev_num_so_far < 0) || (map->ev_num > ev_num_so_far)); |
| 139 | |
| 140 | ev_num_so_far = map->ev_num; |
| 141 | |
| 142 | if (map->ev_num == SDEI_EVENT_0) { |
| 143 | zero_found = 1; |
| 144 | |
| 145 | /* Event 0 must be a Secure SGI */ |
| 146 | assert(is_secure_sgi(map->intr)); |
| 147 | |
| 148 | /* |
| 149 | * Event 0 can have only have signalable flag (apart |
| 150 | * from being private |
| 151 | */ |
| 152 | assert(map->map_flags == (SDEI_MAPF_SIGNALABLE | |
| 153 | SDEI_MAPF_PRIVATE)); |
| 154 | } else { |
| 155 | /* No other mapping should have signalable property */ |
| 156 | assert(!is_event_signalable(map)); |
| 157 | } |
| 158 | |
| 159 | /* Check for valid event */ |
| 160 | assert(map->ev_num >= 0); |
| 161 | |
| 162 | /* Make sure it's a private event */ |
| 163 | assert(is_event_private(map)); |
| 164 | #endif |
| 165 | |
| 166 | /* Skip initializing the wrong priority */ |
| 167 | if (map_to_class(map) != class) |
| 168 | continue; |
| 169 | |
| 170 | /* Platform events are always bound, so set the bound flag */ |
| 171 | if (map->ev_num != SDEI_EVENT_0) { |
| 172 | if (is_map_dynamic(map)) { |
| 173 | assert(map->intr == SDEI_DYN_IRQ); |
| 174 | num_dyn_priv_slots++; |
| 175 | } else { |
| 176 | /* |
| 177 | * Private mappings must be bound to private |
| 178 | * interrupt. |
| 179 | */ |
| 180 | assert(plat_ic_is_ppi(map->intr)); |
| 181 | set_map_bound(map); |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | init_map(map); |
| 186 | } |
| 187 | |
| 188 | /* Ensure event 0 is in the mapping */ |
| 189 | assert(zero_found); |
| 190 | |
| 191 | sdei_cpu_on_init(NULL); |
| 192 | } |
| 193 | |
| 194 | /* SDEI dispatcher initialisation */ |
| 195 | void sdei_init(void) |
| 196 | { |
| 197 | sdei_class_init(SDEI_CRITICAL); |
| 198 | sdei_class_init(SDEI_NORMAL); |
| 199 | |
| 200 | /* Register priority level handlers */ |
| 201 | ehf_register_priority_handler(PLAT_SDEI_CRITICAL_PRI, |
| 202 | sdei_intr_handler); |
| 203 | ehf_register_priority_handler(PLAT_SDEI_NORMAL_PRI, |
| 204 | sdei_intr_handler); |
| 205 | } |
| 206 | |
| 207 | /* Populate SDEI event entry */ |
| 208 | static void set_sdei_entry(sdei_entry_t *se, uint64_t ep, uint64_t arg, |
| 209 | unsigned int flags, uint64_t affinity) |
| 210 | { |
| 211 | assert(se != NULL); |
| 212 | |
| 213 | se->ep = ep; |
| 214 | se->arg = arg; |
| 215 | se->affinity = (affinity & MPIDR_AFFINITY_MASK); |
| 216 | se->reg_flags = flags; |
| 217 | } |
| 218 | |
| 219 | static unsigned long long sdei_version(void) |
| 220 | { |
| 221 | return MAKE_SDEI_VERSION(MAJOR_VERSION, MINOR_VERSION, VENDOR_VERSION); |
| 222 | } |
| 223 | |
| 224 | /* Validate flags and MPIDR values for REGISTER and ROUTING_SET calls */ |
| 225 | static int validate_flags(uint64_t flags, uint64_t mpidr) |
| 226 | { |
| 227 | /* Validate flags */ |
| 228 | switch (flags) { |
| 229 | case SDEI_REGF_RM_PE: |
| 230 | if (!is_valid_affinity(mpidr)) |
| 231 | return SDEI_EINVAL; |
| 232 | break; |
| 233 | case SDEI_REGF_RM_ANY: |
| 234 | break; |
| 235 | default: |
| 236 | /* Unknown flags */ |
| 237 | return SDEI_EINVAL; |
| 238 | } |
| 239 | |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | /* Set routing of an SDEI event */ |
| 244 | static int sdei_event_routing_set(int ev_num, uint64_t flags, uint64_t mpidr) |
| 245 | { |
| 246 | int ret, routing; |
| 247 | sdei_ev_map_t *map; |
| 248 | sdei_entry_t *se; |
| 249 | |
| 250 | ret = validate_flags(flags, mpidr); |
| 251 | if (ret) |
| 252 | return ret; |
| 253 | |
| 254 | /* Check if valid event number */ |
| 255 | map = find_event_map(ev_num); |
| 256 | if (!map) |
| 257 | return SDEI_EINVAL; |
| 258 | |
| 259 | /* The event must not be private */ |
| 260 | if (is_event_private(map)) |
| 261 | return SDEI_EINVAL; |
| 262 | |
| 263 | se = get_event_entry(map); |
| 264 | |
| 265 | sdei_map_lock(map); |
| 266 | |
| 267 | if (!is_map_bound(map) || is_event_private(map)) { |
| 268 | ret = SDEI_EINVAL; |
| 269 | goto finish; |
| 270 | } |
| 271 | |
| 272 | if (!can_sdei_state_trans(se, DO_ROUTING)) { |
| 273 | ret = SDEI_EDENY; |
| 274 | goto finish; |
| 275 | } |
| 276 | |
| 277 | /* Choose appropriate routing */ |
| 278 | routing = (flags == SDEI_REGF_RM_ANY) ? INTR_ROUTING_MODE_ANY : |
| 279 | INTR_ROUTING_MODE_PE; |
| 280 | |
| 281 | /* Update event registration flag */ |
| 282 | se->reg_flags = flags; |
| 283 | |
| 284 | /* |
| 285 | * ROUTING_SET is permissible only when event composite state is |
| 286 | * 'registered, disabled, and not running'. This means that the |
| 287 | * interrupt is currently disabled, and not active. |
| 288 | */ |
| 289 | plat_ic_set_spi_routing(map->intr, routing, (u_register_t) mpidr); |
| 290 | |
| 291 | finish: |
| 292 | sdei_map_unlock(map); |
| 293 | |
| 294 | return ret; |
| 295 | } |
| 296 | |
| 297 | /* Register handler and argument for an SDEI event */ |
| 298 | static int sdei_event_register(int ev_num, uint64_t ep, uint64_t arg, |
| 299 | uint64_t flags, uint64_t mpidr) |
| 300 | { |
| 301 | int ret; |
| 302 | sdei_entry_t *se; |
| 303 | sdei_ev_map_t *map; |
| 304 | sdei_state_t backup_state; |
| 305 | |
| 306 | if (!ep || (plat_sdei_validate_entry_point(ep, sdei_client_el()) != 0)) |
| 307 | return SDEI_EINVAL; |
| 308 | |
| 309 | ret = validate_flags(flags, mpidr); |
| 310 | if (ret) |
| 311 | return ret; |
| 312 | |
| 313 | /* Check if valid event number */ |
| 314 | map = find_event_map(ev_num); |
| 315 | if (!map) |
| 316 | return SDEI_EINVAL; |
| 317 | |
| 318 | /* Private events always target the PE */ |
| 319 | if (is_event_private(map)) |
| 320 | flags = SDEI_REGF_RM_PE; |
| 321 | |
| 322 | se = get_event_entry(map); |
| 323 | |
| 324 | /* |
| 325 | * Even though register operation is per-event (additionally for private |
| 326 | * events, registration is required individually), it has to be |
| 327 | * serialised with respect to bind/release, which are global operations. |
| 328 | * So we hold the lock throughout, unconditionally. |
| 329 | */ |
| 330 | sdei_map_lock(map); |
| 331 | |
| 332 | backup_state = se->state; |
| 333 | if (!can_sdei_state_trans(se, DO_REGISTER)) |
| 334 | goto fallback; |
| 335 | |
| 336 | /* |
| 337 | * When registering for dynamic events, make sure it's been bound |
| 338 | * already. This has to be the case as, without binding, the client |
| 339 | * can't know about the event number to register for. |
| 340 | */ |
| 341 | if (is_map_dynamic(map) && !is_map_bound(map)) |
| 342 | goto fallback; |
| 343 | |
| 344 | if (is_event_private(map)) { |
| 345 | /* Multiple calls to register are possible for private events */ |
| 346 | assert(map->reg_count >= 0); |
| 347 | } else { |
| 348 | /* Only single call to register is possible for shared events */ |
| 349 | assert(map->reg_count == 0); |
| 350 | } |
| 351 | |
| 352 | if (is_map_bound(map)) { |
| 353 | /* Meanwhile, did any PE ACK the interrupt? */ |
| 354 | if (plat_ic_get_interrupt_active(map->intr)) |
| 355 | goto fallback; |
| 356 | |
| 357 | /* The interrupt must currently owned by Non-secure */ |
| 358 | if (plat_ic_get_interrupt_type(map->intr) != INTR_TYPE_NS) |
| 359 | goto fallback; |
| 360 | |
| 361 | /* |
| 362 | * Disable forwarding of new interrupt triggers to CPU |
| 363 | * interface. |
| 364 | */ |
| 365 | plat_ic_disable_interrupt(map->intr); |
| 366 | |
| 367 | /* |
| 368 | * Any events that are triggered after register and before |
| 369 | * enable should remain pending. Clear any previous interrupt |
| 370 | * triggers which are pending (except for SGIs). This has no |
| 371 | * affect on level-triggered interrupts. |
| 372 | */ |
| 373 | if (ev_num != SDEI_EVENT_0) |
| 374 | plat_ic_clear_interrupt_pending(map->intr); |
| 375 | |
| 376 | /* Map interrupt to EL3 and program the correct priority */ |
| 377 | plat_ic_set_interrupt_type(map->intr, INTR_TYPE_EL3); |
| 378 | |
| 379 | /* Program the appropriate interrupt priority */ |
| 380 | plat_ic_set_interrupt_priority(map->intr, sdei_event_priority(map)); |
| 381 | |
| 382 | /* |
| 383 | * Set the routing mode for shared event as requested. We |
| 384 | * already ensure that shared events get bound to SPIs. |
| 385 | */ |
| 386 | if (is_event_shared(map)) { |
| 387 | plat_ic_set_spi_routing(map->intr, |
| 388 | ((flags == SDEI_REGF_RM_ANY) ? |
| 389 | INTR_ROUTING_MODE_ANY : |
| 390 | INTR_ROUTING_MODE_PE), |
| 391 | (u_register_t) mpidr); |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /* Populate event entries */ |
| 396 | set_sdei_entry(se, ep, arg, flags, mpidr); |
| 397 | |
| 398 | /* Increment register count */ |
| 399 | map->reg_count++; |
| 400 | |
| 401 | sdei_map_unlock(map); |
| 402 | |
| 403 | return 0; |
| 404 | |
| 405 | fallback: |
| 406 | /* Reinstate previous state */ |
| 407 | se->state = backup_state; |
| 408 | |
| 409 | sdei_map_unlock(map); |
| 410 | |
| 411 | return SDEI_EDENY; |
| 412 | } |
| 413 | |
| 414 | /* Enable SDEI event */ |
| 415 | static int sdei_event_enable(int ev_num) |
| 416 | { |
| 417 | sdei_ev_map_t *map; |
| 418 | sdei_entry_t *se; |
| 419 | int ret, before, after; |
| 420 | |
| 421 | /* Check if valid event number */ |
| 422 | map = find_event_map(ev_num); |
| 423 | if (!map) |
| 424 | return SDEI_EINVAL; |
| 425 | |
| 426 | se = get_event_entry(map); |
| 427 | ret = SDEI_EDENY; |
| 428 | |
| 429 | if (is_event_shared(map)) |
| 430 | sdei_map_lock(map); |
| 431 | |
| 432 | before = GET_EV_STATE(se, ENABLED); |
| 433 | if (!can_sdei_state_trans(se, DO_ENABLE)) |
| 434 | goto finish; |
| 435 | after = GET_EV_STATE(se, ENABLED); |
| 436 | |
| 437 | /* |
| 438 | * Enable interrupt for bound events only if there's a change in enabled |
| 439 | * state. |
| 440 | */ |
| 441 | if (is_map_bound(map) && (!before && after)) |
| 442 | plat_ic_enable_interrupt(map->intr); |
| 443 | |
| 444 | ret = 0; |
| 445 | |
| 446 | finish: |
| 447 | if (is_event_shared(map)) |
| 448 | sdei_map_unlock(map); |
| 449 | |
| 450 | return ret; |
| 451 | } |
| 452 | |
| 453 | /* Disable SDEI event */ |
| 454 | static int sdei_event_disable(int ev_num) |
| 455 | { |
| 456 | sdei_ev_map_t *map; |
| 457 | sdei_entry_t *se; |
| 458 | int ret, before, after; |
| 459 | |
| 460 | /* Check if valid event number */ |
| 461 | map = find_event_map(ev_num); |
| 462 | if (!map) |
| 463 | return SDEI_EINVAL; |
| 464 | |
| 465 | se = get_event_entry(map); |
| 466 | ret = SDEI_EDENY; |
| 467 | |
| 468 | if (is_event_shared(map)) |
| 469 | sdei_map_lock(map); |
| 470 | |
| 471 | before = GET_EV_STATE(se, ENABLED); |
| 472 | if (!can_sdei_state_trans(se, DO_DISABLE)) |
| 473 | goto finish; |
| 474 | after = GET_EV_STATE(se, ENABLED); |
| 475 | |
| 476 | /* |
| 477 | * Disable interrupt for bound events only if there's a change in |
| 478 | * enabled state. |
| 479 | */ |
| 480 | if (is_map_bound(map) && (before && !after)) |
| 481 | plat_ic_disable_interrupt(map->intr); |
| 482 | |
| 483 | ret = 0; |
| 484 | |
| 485 | finish: |
| 486 | if (is_event_shared(map)) |
| 487 | sdei_map_unlock(map); |
| 488 | |
| 489 | return ret; |
| 490 | } |
| 491 | |
| 492 | /* Query SDEI event information */ |
| 493 | static uint64_t sdei_event_get_info(int ev_num, int info) |
| 494 | { |
| 495 | sdei_entry_t *se; |
| 496 | sdei_ev_map_t *map; |
| 497 | |
| 498 | unsigned int flags, registered; |
| 499 | uint64_t affinity; |
| 500 | |
| 501 | /* Check if valid event number */ |
| 502 | map = find_event_map(ev_num); |
| 503 | if (!map) |
| 504 | return SDEI_EINVAL; |
| 505 | |
| 506 | se = get_event_entry(map); |
| 507 | |
| 508 | if (is_event_shared(map)) |
| 509 | sdei_map_lock(map); |
| 510 | |
| 511 | /* Sample state under lock */ |
| 512 | registered = GET_EV_STATE(se, REGISTERED); |
| 513 | flags = se->reg_flags; |
| 514 | affinity = se->affinity; |
| 515 | |
| 516 | if (is_event_shared(map)) |
| 517 | sdei_map_unlock(map); |
| 518 | |
| 519 | switch (info) { |
| 520 | case SDEI_INFO_EV_TYPE: |
| 521 | return is_event_shared(map); |
| 522 | |
| 523 | case SDEI_INFO_EV_NOT_SIGNALED: |
| 524 | return !is_event_signalable(map); |
| 525 | |
| 526 | case SDEI_INFO_EV_PRIORITY: |
| 527 | return is_event_critical(map); |
| 528 | |
| 529 | case SDEI_INFO_EV_ROUTING_MODE: |
| 530 | if (!is_event_shared(map)) |
| 531 | return SDEI_EINVAL; |
| 532 | if (!registered) |
| 533 | return SDEI_EDENY; |
| 534 | return (flags == SDEI_REGF_RM_PE); |
| 535 | |
| 536 | case SDEI_INFO_EV_ROUTING_AFF: |
| 537 | if (!is_event_shared(map)) |
| 538 | return SDEI_EINVAL; |
| 539 | if (!registered) |
| 540 | return SDEI_EDENY; |
| 541 | if (flags != SDEI_REGF_RM_PE) |
| 542 | return SDEI_EINVAL; |
| 543 | return affinity; |
| 544 | |
| 545 | default: |
| 546 | return SDEI_EINVAL; |
| 547 | } |
| 548 | } |
| 549 | |
| 550 | /* Unregister an SDEI event */ |
| 551 | static int sdei_event_unregister(int ev_num) |
| 552 | { |
| 553 | int ret = 0; |
| 554 | sdei_entry_t *se; |
| 555 | sdei_ev_map_t *map; |
| 556 | |
| 557 | /* Check if valid event number */ |
| 558 | map = find_event_map(ev_num); |
| 559 | if (!map) |
| 560 | return SDEI_EINVAL; |
| 561 | |
| 562 | se = get_event_entry(map); |
| 563 | |
| 564 | /* |
| 565 | * Even though unregister operation is per-event (additionally for |
| 566 | * private events, unregistration is required individually), it has to |
| 567 | * be serialised with respect to bind/release, which are global |
| 568 | * operations. So we hold the lock throughout, unconditionally. |
| 569 | */ |
| 570 | sdei_map_lock(map); |
| 571 | |
| 572 | if (!can_sdei_state_trans(se, DO_UNREGISTER)) { |
| 573 | /* |
| 574 | * Even if the call is invalid, and the handler is running (for |
| 575 | * example, having unregistered from a running handler earlier), |
| 576 | * return pending error code; otherwise, return deny. |
| 577 | */ |
| 578 | ret = GET_EV_STATE(se, RUNNING) ? SDEI_EPEND : SDEI_EDENY; |
| 579 | |
| 580 | goto finish; |
| 581 | } |
| 582 | |
| 583 | map->reg_count--; |
| 584 | if (is_event_private(map)) { |
| 585 | /* Multiple calls to register are possible for private events */ |
| 586 | assert(map->reg_count >= 0); |
| 587 | } else { |
| 588 | /* Only single call to register is possible for shared events */ |
| 589 | assert(map->reg_count == 0); |
| 590 | } |
| 591 | |
| 592 | if (is_map_bound(map)) { |
| 593 | plat_ic_disable_interrupt(map->intr); |
| 594 | |
| 595 | /* |
| 596 | * Clear pending interrupt. Skip for SGIs as they may not be |
| 597 | * cleared on interrupt controllers. |
| 598 | */ |
| 599 | if (ev_num != SDEI_EVENT_0) |
| 600 | plat_ic_clear_interrupt_pending(map->intr); |
| 601 | |
| 602 | assert(plat_ic_get_interrupt_type(map->intr) == INTR_TYPE_EL3); |
| 603 | plat_ic_set_interrupt_type(map->intr, INTR_TYPE_NS); |
| 604 | plat_ic_set_interrupt_priority(map->intr, LOWEST_INTR_PRIORITY); |
| 605 | } |
| 606 | |
| 607 | clear_event_entries(se); |
| 608 | |
| 609 | /* |
| 610 | * If the handler is running at the time of unregister, return the |
| 611 | * pending error code. |
| 612 | */ |
| 613 | if (GET_EV_STATE(se, RUNNING)) |
| 614 | ret = SDEI_EPEND; |
| 615 | |
| 616 | finish: |
| 617 | sdei_map_unlock(map); |
| 618 | |
| 619 | return ret; |
| 620 | } |
| 621 | |
| 622 | /* Query status of an SDEI event */ |
| 623 | static int sdei_event_status(int ev_num) |
| 624 | { |
| 625 | sdei_ev_map_t *map; |
| 626 | sdei_entry_t *se; |
| 627 | sdei_state_t state; |
| 628 | |
| 629 | /* Check if valid event number */ |
| 630 | map = find_event_map(ev_num); |
| 631 | if (!map) |
| 632 | return SDEI_EINVAL; |
| 633 | |
| 634 | se = get_event_entry(map); |
| 635 | |
| 636 | if (is_event_shared(map)) |
| 637 | sdei_map_lock(map); |
| 638 | |
| 639 | /* State value directly maps to the expected return format */ |
| 640 | state = se->state; |
| 641 | |
| 642 | if (is_event_shared(map)) |
| 643 | sdei_map_unlock(map); |
| 644 | |
| 645 | return state; |
| 646 | } |
| 647 | |
| 648 | /* Bind an SDEI event to an interrupt */ |
| 649 | static int sdei_interrupt_bind(int intr_num) |
| 650 | { |
| 651 | sdei_ev_map_t *map; |
| 652 | int retry = 1, shared_mapping; |
| 653 | |
| 654 | /* SGIs are not allowed to be bound */ |
| 655 | if (plat_ic_is_sgi(intr_num)) |
| 656 | return SDEI_EINVAL; |
| 657 | |
| 658 | shared_mapping = plat_ic_is_spi(intr_num); |
| 659 | do { |
| 660 | /* |
| 661 | * Bail out if there is already an event for this interrupt, |
| 662 | * either platform-defined or dynamic. |
| 663 | */ |
| 664 | map = find_event_map_by_intr(intr_num, shared_mapping); |
| 665 | if (map) { |
| 666 | if (is_map_dynamic(map)) { |
| 667 | if (is_map_bound(map)) { |
| 668 | /* |
| 669 | * Dynamic event, already bound. Return |
| 670 | * event number. |
| 671 | */ |
| 672 | return map->ev_num; |
| 673 | } |
| 674 | } else { |
| 675 | /* Binding non-dynamic event */ |
| 676 | return SDEI_EINVAL; |
| 677 | } |
| 678 | } |
| 679 | |
| 680 | /* |
| 681 | * The interrupt is not bound yet. Try to find a free slot to |
| 682 | * bind it. Free dynamic mappings have their interrupt set as |
| 683 | * SDEI_DYN_IRQ. |
| 684 | */ |
| 685 | map = find_event_map_by_intr(SDEI_DYN_IRQ, shared_mapping); |
| 686 | if (!map) |
| 687 | return SDEI_ENOMEM; |
| 688 | |
| 689 | /* The returned mapping must be dynamic */ |
| 690 | assert(is_map_dynamic(map)); |
| 691 | |
| 692 | /* |
| 693 | * We cannot assert for bound maps here, as we might be racing |
| 694 | * with another bind. |
| 695 | */ |
| 696 | |
| 697 | /* The requested interrupt must already belong to NS */ |
| 698 | if (plat_ic_get_interrupt_type(intr_num) != INTR_TYPE_NS) |
| 699 | return SDEI_EDENY; |
| 700 | |
| 701 | /* |
| 702 | * Interrupt programming and ownership transfer are deferred |
| 703 | * until register. |
| 704 | */ |
| 705 | |
| 706 | sdei_map_lock(map); |
| 707 | if (!is_map_bound(map)) { |
| 708 | map->intr = intr_num; |
| 709 | set_map_bound(map); |
| 710 | retry = 0; |
| 711 | } |
| 712 | sdei_map_unlock(map); |
| 713 | } while (retry); |
| 714 | |
| 715 | return map->ev_num; |
| 716 | } |
| 717 | |
| 718 | /* Release a bound SDEI event previously to an interrupt */ |
| 719 | static int sdei_interrupt_release(int ev_num) |
| 720 | { |
| 721 | int ret = 0; |
| 722 | sdei_ev_map_t *map; |
| 723 | sdei_entry_t *se; |
| 724 | |
| 725 | /* Check if valid event number */ |
| 726 | map = find_event_map(ev_num); |
| 727 | if (!map) |
| 728 | return SDEI_EINVAL; |
| 729 | |
| 730 | if (!is_map_dynamic(map)) |
| 731 | return SDEI_EINVAL; |
| 732 | |
| 733 | se = get_event_entry(map); |
| 734 | |
| 735 | sdei_map_lock(map); |
| 736 | |
| 737 | /* Event must have been unregistered before release */ |
| 738 | if (map->reg_count != 0) { |
| 739 | ret = SDEI_EDENY; |
| 740 | goto finish; |
| 741 | } |
| 742 | |
| 743 | /* |
| 744 | * Interrupt release never causes the state to change. We only check |
| 745 | * whether it's permissible or not. |
| 746 | */ |
| 747 | if (!can_sdei_state_trans(se, DO_RELEASE)) { |
| 748 | ret = SDEI_EDENY; |
| 749 | goto finish; |
| 750 | } |
| 751 | |
| 752 | if (is_map_bound(map)) { |
| 753 | /* |
| 754 | * Deny release if the interrupt is active, which means it's |
| 755 | * probably being acknowledged and handled elsewhere. |
| 756 | */ |
| 757 | if (plat_ic_get_interrupt_active(map->intr)) { |
| 758 | ret = SDEI_EDENY; |
| 759 | goto finish; |
| 760 | } |
| 761 | |
| 762 | /* |
| 763 | * Interrupt programming and ownership transfer are already done |
| 764 | * during unregister. |
| 765 | */ |
| 766 | |
| 767 | map->intr = SDEI_DYN_IRQ; |
| 768 | clr_map_bound(map); |
| 769 | } else { |
| 770 | SDEI_LOG("Error release bound:%d cnt:%d\n", is_map_bound(map), |
| 771 | map->reg_count); |
| 772 | ret = SDEI_EINVAL; |
| 773 | } |
| 774 | |
| 775 | finish: |
| 776 | sdei_map_unlock(map); |
| 777 | |
| 778 | return ret; |
| 779 | } |
| 780 | |
| 781 | /* Perform reset of private SDEI events */ |
| 782 | static int sdei_private_reset(void) |
| 783 | { |
| 784 | sdei_ev_map_t *map; |
| 785 | int ret = 0, final_ret = 0, i; |
| 786 | |
| 787 | /* Unregister all private events */ |
| 788 | for_each_private_map(i, map) { |
| 789 | /* |
| 790 | * The unregister can fail if the event is not registered, which |
| 791 | * is allowed, and a deny will be returned. But if the event is |
| 792 | * running or unregister pending, the call fails. |
| 793 | */ |
| 794 | ret = sdei_event_unregister(map->ev_num); |
| 795 | if ((ret == SDEI_EPEND) && (final_ret == 0)) |
| 796 | final_ret = ret; |
| 797 | } |
| 798 | |
| 799 | return final_ret; |
| 800 | } |
| 801 | |
| 802 | /* Perform reset of shared SDEI events */ |
| 803 | static int sdei_shared_reset(void) |
| 804 | { |
| 805 | const sdei_mapping_t *mapping; |
| 806 | sdei_ev_map_t *map; |
| 807 | int ret = 0, final_ret = 0, i, j; |
| 808 | |
| 809 | /* Unregister all shared events */ |
| 810 | for_each_shared_map(i, map) { |
| 811 | /* |
| 812 | * The unregister can fail if the event is not registered, which |
| 813 | * is allowed, and a deny will be returned. But if the event is |
| 814 | * running or unregister pending, the call fails. |
| 815 | */ |
| 816 | ret = sdei_event_unregister(map->ev_num); |
| 817 | if ((ret == SDEI_EPEND) && (final_ret == 0)) |
| 818 | final_ret = ret; |
| 819 | } |
| 820 | |
| 821 | if (final_ret != 0) |
| 822 | return final_ret; |
| 823 | |
| 824 | /* |
| 825 | * Loop through both private and shared mappings, and release all |
| 826 | * bindings. |
| 827 | */ |
| 828 | for_each_mapping_type(i, mapping) { |
| 829 | iterate_mapping(mapping, j, map) { |
| 830 | /* |
| 831 | * Release bindings for mappings that are dynamic and |
| 832 | * bound. |
| 833 | */ |
| 834 | if (is_map_dynamic(map) && is_map_bound(map)) { |
| 835 | /* |
| 836 | * Any failure to release would mean there is at |
| 837 | * least a PE registered for the event. |
| 838 | */ |
| 839 | ret = sdei_interrupt_release(map->ev_num); |
| 840 | if ((ret != 0) && (final_ret == 0)) |
| 841 | final_ret = ret; |
| 842 | } |
| 843 | } |
| 844 | } |
| 845 | |
| 846 | return final_ret; |
| 847 | } |
| 848 | |
| 849 | /* Send a signal to another SDEI client PE */ |
| 850 | int sdei_signal(int event, uint64_t target_pe) |
| 851 | { |
| 852 | sdei_ev_map_t *map; |
| 853 | |
| 854 | /* Only event 0 can be signalled */ |
| 855 | if (event != SDEI_EVENT_0) |
| 856 | return SDEI_EINVAL; |
| 857 | |
| 858 | /* Find mapping for event 0 */ |
| 859 | map = find_event_map(SDEI_EVENT_0); |
| 860 | if (!map) |
| 861 | return SDEI_EINVAL; |
| 862 | |
| 863 | /* The event must be signalable */ |
| 864 | if (!is_event_signalable(map)) |
| 865 | return SDEI_EINVAL; |
| 866 | |
| 867 | /* Validate target */ |
| 868 | if (plat_core_pos_by_mpidr(target_pe) < 0) |
| 869 | return SDEI_EINVAL; |
| 870 | |
| 871 | /* Raise SGI. Platform will validate target_pe */ |
| 872 | plat_ic_raise_el3_sgi(map->intr, (u_register_t) target_pe); |
| 873 | |
| 874 | return 0; |
| 875 | } |
| 876 | |
| 877 | /* Query SDEI dispatcher features */ |
| 878 | uint64_t sdei_features(unsigned int feature) |
| 879 | { |
| 880 | if (feature == SDEI_FEATURE_BIND_SLOTS) { |
| 881 | return FEATURE_BIND_SLOTS(num_dyn_priv_slots, |
| 882 | num_dyn_shrd_slots); |
| 883 | } |
| 884 | |
| 885 | return SDEI_EINVAL; |
| 886 | } |
| 887 | |
| 888 | /* SDEI top level handler for servicing SMCs */ |
| 889 | uint64_t sdei_smc_handler(uint32_t smc_fid, |
| 890 | uint64_t x1, |
| 891 | uint64_t x2, |
| 892 | uint64_t x3, |
| 893 | uint64_t x4, |
| 894 | void *cookie, |
| 895 | void *handle, |
| 896 | uint64_t flags) |
| 897 | { |
| 898 | |
| 899 | uint64_t x5; |
| 900 | int ss = get_interrupt_src_ss(flags); |
| 901 | int64_t ret; |
| 902 | unsigned int resume = 0; |
| 903 | |
| 904 | if (ss != NON_SECURE) |
| 905 | SMC_RET1(handle, SMC_UNK); |
| 906 | |
| 907 | /* Verify the caller EL */ |
| 908 | if (GET_EL(read_spsr_el3()) != sdei_client_el()) |
| 909 | SMC_RET1(handle, SMC_UNK); |
| 910 | |
| 911 | switch (smc_fid) { |
| 912 | case SDEI_VERSION: |
| 913 | SDEI_LOG("> VER\n"); |
| 914 | ret = sdei_version(); |
| 915 | SDEI_LOG("< VER:%lx\n", ret); |
| 916 | SMC_RET1(handle, ret); |
| 917 | break; |
| 918 | |
| 919 | case SDEI_EVENT_REGISTER: |
| 920 | x5 = SMC_GET_GP(handle, CTX_GPREG_X5); |
| 921 | SDEI_LOG("> REG(n:%d e:%lx a:%lx f:%x m:%lx)\n", (int) x1, |
| 922 | x2, x3, (int) x4, x5); |
| 923 | ret = sdei_event_register(x1, x2, x3, x4, x5); |
| 924 | SDEI_LOG("< REG:%ld\n", ret); |
| 925 | SMC_RET1(handle, ret); |
| 926 | break; |
| 927 | |
| 928 | case SDEI_EVENT_ENABLE: |
| 929 | SDEI_LOG("> ENABLE(n:%d)\n", (int) x1); |
| 930 | ret = sdei_event_enable(x1); |
| 931 | SDEI_LOG("< ENABLE:%ld\n", ret); |
| 932 | SMC_RET1(handle, ret); |
| 933 | break; |
| 934 | |
| 935 | case SDEI_EVENT_DISABLE: |
| 936 | SDEI_LOG("> DISABLE(n:%d)\n", (int) x1); |
| 937 | ret = sdei_event_disable(x1); |
| 938 | SDEI_LOG("< DISABLE:%ld\n", ret); |
| 939 | SMC_RET1(handle, ret); |
| 940 | break; |
| 941 | |
| 942 | case SDEI_EVENT_CONTEXT: |
| 943 | SDEI_LOG("> CTX(p:%d):%lx\n", (int) x1, read_mpidr_el1()); |
| 944 | ret = sdei_event_context(handle, x1); |
| 945 | SDEI_LOG("< CTX:%ld\n", ret); |
| 946 | SMC_RET1(handle, ret); |
| 947 | break; |
| 948 | |
| 949 | case SDEI_EVENT_COMPLETE_AND_RESUME: |
| 950 | resume = 1; |
| 951 | /* Fall through */ |
| 952 | |
| 953 | case SDEI_EVENT_COMPLETE: |
| 954 | SDEI_LOG("> COMPLETE(r:%d sta/ep:%lx):%lx\n", resume, x1, |
| 955 | read_mpidr_el1()); |
| 956 | ret = sdei_event_complete(resume, x1); |
| 957 | SDEI_LOG("< COMPLETE:%lx\n", ret); |
| 958 | |
| 959 | /* |
| 960 | * Set error code only if the call failed. If the call |
| 961 | * succeeded, we discard the dispatched context, and restore the |
| 962 | * interrupted context to a pristine condition, and therefore |
| 963 | * shouldn't be modified. We don't return to the caller in this |
| 964 | * case anyway. |
| 965 | */ |
| 966 | if (ret) |
| 967 | SMC_RET1(handle, ret); |
| 968 | |
| 969 | SMC_RET0(handle); |
| 970 | break; |
| 971 | |
| 972 | case SDEI_EVENT_STATUS: |
| 973 | SDEI_LOG("> STAT(n:%d)\n", (int) x1); |
| 974 | ret = sdei_event_status(x1); |
| 975 | SDEI_LOG("< STAT:%ld\n", ret); |
| 976 | SMC_RET1(handle, ret); |
| 977 | break; |
| 978 | |
| 979 | case SDEI_EVENT_GET_INFO: |
| 980 | SDEI_LOG("> INFO(n:%d, %d)\n", (int) x1, (int) x2); |
| 981 | ret = sdei_event_get_info(x1, x2); |
| 982 | SDEI_LOG("< INFO:%ld\n", ret); |
| 983 | SMC_RET1(handle, ret); |
| 984 | break; |
| 985 | |
| 986 | case SDEI_EVENT_UNREGISTER: |
| 987 | SDEI_LOG("> UNREG(n:%d)\n", (int) x1); |
| 988 | ret = sdei_event_unregister(x1); |
| 989 | SDEI_LOG("< UNREG:%ld\n", ret); |
| 990 | SMC_RET1(handle, ret); |
| 991 | break; |
| 992 | |
| 993 | case SDEI_PE_UNMASK: |
| 994 | SDEI_LOG("> UNMASK:%lx\n", read_mpidr_el1()); |
| 995 | sdei_pe_unmask(); |
Jeenu Viswambharan | 22a16f9 | 2017-11-13 12:30:45 +0000 | [diff] [blame] | 996 | SDEI_LOG("< UNMASK:%d\n", 0); |
Jeenu Viswambharan | 04e3a7f | 2017-10-16 08:43:14 +0100 | [diff] [blame] | 997 | SMC_RET1(handle, 0); |
| 998 | break; |
| 999 | |
| 1000 | case SDEI_PE_MASK: |
| 1001 | SDEI_LOG("> MASK:%lx\n", read_mpidr_el1()); |
| 1002 | ret = sdei_pe_mask(); |
| 1003 | SDEI_LOG("< MASK:%ld\n", ret); |
| 1004 | SMC_RET1(handle, ret); |
| 1005 | break; |
| 1006 | |
| 1007 | case SDEI_INTERRUPT_BIND: |
| 1008 | SDEI_LOG("> BIND(%d)\n", (int) x1); |
| 1009 | ret = sdei_interrupt_bind(x1); |
| 1010 | SDEI_LOG("< BIND:%ld\n", ret); |
| 1011 | SMC_RET1(handle, ret); |
| 1012 | break; |
| 1013 | |
| 1014 | case SDEI_INTERRUPT_RELEASE: |
| 1015 | SDEI_LOG("> REL(%d)\n", (int) x1); |
| 1016 | ret = sdei_interrupt_release(x1); |
| 1017 | SDEI_LOG("< REL:%ld\n", ret); |
| 1018 | SMC_RET1(handle, ret); |
| 1019 | break; |
| 1020 | |
| 1021 | case SDEI_SHARED_RESET: |
| 1022 | SDEI_LOG("> S_RESET():%lx\n", read_mpidr_el1()); |
| 1023 | ret = sdei_shared_reset(); |
| 1024 | SDEI_LOG("< S_RESET:%ld\n", ret); |
| 1025 | SMC_RET1(handle, ret); |
| 1026 | break; |
| 1027 | |
| 1028 | case SDEI_PRIVATE_RESET: |
| 1029 | SDEI_LOG("> P_RESET():%lx\n", read_mpidr_el1()); |
| 1030 | ret = sdei_private_reset(); |
| 1031 | SDEI_LOG("< P_RESET:%ld\n", ret); |
| 1032 | SMC_RET1(handle, ret); |
| 1033 | break; |
| 1034 | |
| 1035 | case SDEI_EVENT_ROUTING_SET: |
| 1036 | SDEI_LOG("> ROUTE_SET(n:%d f:%lx aff:%lx)\n", (int) x1, x2, x3); |
| 1037 | ret = sdei_event_routing_set(x1, x2, x3); |
| 1038 | SDEI_LOG("< ROUTE_SET:%ld\n", ret); |
| 1039 | SMC_RET1(handle, ret); |
| 1040 | break; |
| 1041 | |
| 1042 | case SDEI_FEATURES: |
| 1043 | SDEI_LOG("> FTRS(f:%lx)\n", x1); |
| 1044 | ret = sdei_features(x1); |
| 1045 | SDEI_LOG("< FTRS:%lx\n", ret); |
| 1046 | SMC_RET1(handle, ret); |
| 1047 | break; |
| 1048 | |
| 1049 | case SDEI_EVENT_SIGNAL: |
| 1050 | SDEI_LOG("> SIGNAL(e:%lx t:%lx)\n", x1, x2); |
| 1051 | ret = sdei_signal(x1, x2); |
| 1052 | SDEI_LOG("< SIGNAL:%ld\n", ret); |
| 1053 | SMC_RET1(handle, ret); |
| 1054 | break; |
| 1055 | default: |
| 1056 | break; |
| 1057 | } |
| 1058 | |
| 1059 | WARN("Unimplemented SDEI Call: 0x%x\n", smc_fid); |
| 1060 | SMC_RET1(handle, SMC_UNK); |
| 1061 | } |
| 1062 | |
| 1063 | /* Subscribe to PSCI CPU on to initialize per-CPU SDEI configuration */ |
| 1064 | SUBSCRIBE_TO_EVENT(psci_cpu_on_finish, sdei_cpu_on_init); |