1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * AMD Platform Management Framework Driver 4 * 5 * Copyright (c) 2022, Advanced Micro Devices, Inc. 6 * All Rights Reserved. 7 * 8 * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com> 9 */ 10 11 #include <linux/acpi.h> 12 #include "pmf.h" 13 14 #define APMF_CQL_NOTIFICATION 2 15 #define APMF_AMT_NOTIFICATION 3 16 17 static union acpi_object *apmf_if_call(struct amd_pmf_dev *pdev, int fn, struct acpi_buffer *param) 18 { 19 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 20 acpi_handle ahandle = ACPI_HANDLE(pdev->dev); 21 struct acpi_object_list apmf_if_arg_list; 22 union acpi_object apmf_if_args[2]; 23 acpi_status status; 24 25 apmf_if_arg_list.count = 2; 26 apmf_if_arg_list.pointer = &apmf_if_args[0]; 27 28 apmf_if_args[0].type = ACPI_TYPE_INTEGER; 29 apmf_if_args[0].integer.value = fn; 30 31 if (param) { 32 apmf_if_args[1].type = ACPI_TYPE_BUFFER; 33 apmf_if_args[1].buffer.length = param->length; 34 apmf_if_args[1].buffer.pointer = param->pointer; 35 } else { 36 apmf_if_args[1].type = ACPI_TYPE_INTEGER; 37 apmf_if_args[1].integer.value = 0; 38 } 39 40 status = acpi_evaluate_object(ahandle, "APMF", &apmf_if_arg_list, &buffer); 41 if (ACPI_FAILURE(status)) { 42 dev_err(pdev->dev, "APMF method:%d call failed\n", fn); 43 kfree(buffer.pointer); 44 return NULL; 45 } 46 47 return buffer.pointer; 48 } 49 50 static int apmf_if_call_store_buffer(struct amd_pmf_dev *pdev, int fn, void *dest, size_t out_sz) 51 { 52 union acpi_object *info; 53 size_t size; 54 int err = 0; 55 56 info = apmf_if_call(pdev, fn, NULL); 57 if (!info) 58 return -EIO; 59 60 if (info->type != ACPI_TYPE_BUFFER) { 61 dev_err(pdev->dev, "object is not a buffer\n"); 62 err = -EINVAL; 63 goto out; 64 } 65 66 if (info->buffer.length < 2) { 67 dev_err(pdev->dev, "buffer too small\n"); 68 err = -EINVAL; 69 goto out; 70 } 71 72 size = *(u16 *)info->buffer.pointer; 73 if (info->buffer.length < size) { 74 dev_err(pdev->dev, "buffer smaller then headersize %u < %zu\n", 75 info->buffer.length, size); 76 err = -EINVAL; 77 goto out; 78 } 79 80 if (size < out_sz) { 81 dev_err(pdev->dev, "buffer too small %zu\n", size); 82 err = -EINVAL; 83 goto out; 84 } 85 86 memcpy(dest, info->buffer.pointer, out_sz); 87 88 out: 89 kfree(info); 90 return err; 91 } 92 93 static union acpi_object *apts_if_call(struct amd_pmf_dev *pdev, u32 state_index) 94 { 95 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 96 acpi_handle ahandle = ACPI_HANDLE(pdev->dev); 97 struct acpi_object_list apts_if_arg_list; 98 union acpi_object apts_if_args[3]; 99 acpi_status status; 100 101 apts_if_arg_list.count = 3; 102 apts_if_arg_list.pointer = &apts_if_args[0]; 103 104 apts_if_args[0].type = ACPI_TYPE_INTEGER; 105 apts_if_args[0].integer.value = 1; 106 apts_if_args[1].type = ACPI_TYPE_INTEGER; 107 apts_if_args[1].integer.value = state_index; 108 apts_if_args[2].type = ACPI_TYPE_INTEGER; 109 apts_if_args[2].integer.value = 0; 110 111 status = acpi_evaluate_object(ahandle, "APTS", &apts_if_arg_list, &buffer); 112 if (ACPI_FAILURE(status)) { 113 dev_err(pdev->dev, "APTS state_idx:%u call failed\n", state_index); 114 kfree(buffer.pointer); 115 return NULL; 116 } 117 118 return buffer.pointer; 119 } 120 121 static int apts_if_call_store_buffer(struct amd_pmf_dev *pdev, 122 u32 index, void *data, size_t out_sz) 123 { 124 union acpi_object *info; 125 size_t size; 126 int err = 0; 127 128 info = apts_if_call(pdev, index); 129 if (!info) 130 return -EIO; 131 132 if (info->type != ACPI_TYPE_BUFFER) { 133 dev_err(pdev->dev, "object is not a buffer\n"); 134 err = -EINVAL; 135 goto out; 136 } 137 138 size = *(u16 *)info->buffer.pointer; 139 if (info->buffer.length < size) { 140 dev_err(pdev->dev, "buffer smaller than header size %u < %zu\n", 141 info->buffer.length, size); 142 err = -EINVAL; 143 goto out; 144 } 145 146 if (size < out_sz) { 147 dev_err(pdev->dev, "buffer too small %zu\n", size); 148 err = -EINVAL; 149 goto out; 150 } 151 152 memcpy(data, info->buffer.pointer, out_sz); 153 out: 154 kfree(info); 155 return err; 156 } 157 158 int is_apmf_func_supported(struct amd_pmf_dev *pdev, unsigned long index) 159 { 160 /* If bit-n is set, that indicates function n+1 is supported */ 161 return !!(pdev->supported_func & BIT(index - 1)); 162 } 163 164 int is_apmf_bios_input_notifications_supported(struct amd_pmf_dev *pdev) 165 { 166 return !!(pdev->notifications & CUSTOM_BIOS_INPUT_BITS); 167 } 168 169 int apts_get_static_slider_granular_v2(struct amd_pmf_dev *pdev, 170 struct amd_pmf_apts_granular_output *data, u32 apts_idx) 171 { 172 if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR)) 173 return -EINVAL; 174 175 return apts_if_call_store_buffer(pdev, apts_idx, data, sizeof(*data)); 176 } 177 178 int apmf_get_static_slider_granular_v2(struct amd_pmf_dev *pdev, 179 struct apmf_static_slider_granular_output_v2 *data) 180 { 181 if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR)) 182 return -EINVAL; 183 184 return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR, 185 data, sizeof(*data)); 186 } 187 188 int apmf_get_static_slider_granular(struct amd_pmf_dev *pdev, 189 struct apmf_static_slider_granular_output *data) 190 { 191 if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR)) 192 return -EINVAL; 193 194 return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR, 195 data, sizeof(*data)); 196 } 197 198 int apmf_os_power_slider_update(struct amd_pmf_dev *pdev, u8 event) 199 { 200 struct os_power_slider args; 201 struct acpi_buffer params; 202 union acpi_object *info; 203 204 args.size = sizeof(args); 205 args.slider_event = event; 206 207 params.length = sizeof(args); 208 params.pointer = (void *)&args; 209 210 info = apmf_if_call(pdev, APMF_FUNC_OS_POWER_SLIDER_UPDATE, ¶ms); 211 if (!info) 212 return -EIO; 213 214 kfree(info); 215 return 0; 216 } 217 218 static void apmf_sbios_heartbeat_notify(struct work_struct *work) 219 { 220 struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, heart_beat.work); 221 union acpi_object *info; 222 223 dev_dbg(dev->dev, "Sending heartbeat to SBIOS\n"); 224 info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT, NULL); 225 if (!info) 226 return; 227 228 schedule_delayed_work(&dev->heart_beat, secs_to_jiffies(dev->hb_interval)); 229 kfree(info); 230 } 231 232 int amd_pmf_notify_sbios_heartbeat_event_v2(struct amd_pmf_dev *dev, u8 flag) 233 { 234 struct sbios_hb_event_v2 args = { }; 235 struct acpi_buffer params; 236 union acpi_object *info; 237 238 args.size = sizeof(args); 239 240 switch (flag) { 241 case ON_LOAD: 242 args.load = 1; 243 break; 244 case ON_UNLOAD: 245 args.unload = 1; 246 break; 247 case ON_SUSPEND: 248 args.suspend = 1; 249 break; 250 case ON_RESUME: 251 args.resume = 1; 252 break; 253 default: 254 dev_dbg(dev->dev, "Failed to send v2 heartbeat event, flag:0x%x\n", flag); 255 return -EINVAL; 256 } 257 258 params.length = sizeof(args); 259 params.pointer = &args; 260 261 info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT_V2, ¶ms); 262 if (!info) 263 return -EIO; 264 265 kfree(info); 266 return 0; 267 } 268 269 int apmf_update_fan_idx(struct amd_pmf_dev *pdev, bool manual, u32 idx) 270 { 271 union acpi_object *info; 272 struct apmf_fan_idx args; 273 struct acpi_buffer params; 274 275 args.size = sizeof(args); 276 args.fan_ctl_mode = manual; 277 args.fan_ctl_idx = idx; 278 279 params.length = sizeof(args); 280 params.pointer = (void *)&args; 281 282 info = apmf_if_call(pdev, APMF_FUNC_SET_FAN_IDX, ¶ms); 283 if (!info) 284 return -EIO; 285 286 kfree(info); 287 return 0; 288 } 289 290 static int apmf_notify_smart_pc_update(struct amd_pmf_dev *pdev, u32 val, u32 preq, u32 index) 291 { 292 struct amd_pmf_notify_smart_pc_update args; 293 struct acpi_buffer params; 294 union acpi_object *info; 295 296 args.size = sizeof(args); 297 args.pending_req = preq; 298 args.custom_bios[index] = val; 299 300 params.length = sizeof(args); 301 params.pointer = &args; 302 303 info = apmf_if_call(pdev, APMF_FUNC_NOTIFY_SMART_PC_UPDATES, ¶ms); 304 if (!info) 305 return -EIO; 306 307 kfree(info); 308 dev_dbg(pdev->dev, "Notify smart pc update, val: %u\n", val); 309 310 return 0; 311 } 312 313 int apmf_get_auto_mode_def(struct amd_pmf_dev *pdev, struct apmf_auto_mode *data) 314 { 315 return apmf_if_call_store_buffer(pdev, APMF_FUNC_AUTO_MODE, data, sizeof(*data)); 316 } 317 318 int apmf_get_sbios_requests_v2(struct amd_pmf_dev *pdev, struct apmf_sbios_req_v2 *req) 319 { 320 return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS, req, sizeof(*req)); 321 } 322 323 int apmf_get_sbios_requests_v1(struct amd_pmf_dev *pdev, struct apmf_sbios_req_v1 *req) 324 { 325 return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS, req, sizeof(*req)); 326 } 327 328 int apmf_get_sbios_requests(struct amd_pmf_dev *pdev, struct apmf_sbios_req *req) 329 { 330 return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS, 331 req, sizeof(*req)); 332 } 333 334 static void amd_pmf_handle_early_preq(struct amd_pmf_dev *pdev) 335 { 336 if (!pdev->cb_flag) 337 return; 338 339 amd_pmf_invoke_cmd_enact(pdev); 340 pdev->cb_flag = false; 341 } 342 343 static void apmf_event_handler_v2(acpi_handle handle, u32 event, void *data) 344 { 345 struct amd_pmf_dev *pmf_dev = data; 346 int ret; 347 348 guard(mutex)(&pmf_dev->cb_mutex); 349 350 ret = apmf_get_sbios_requests_v2(pmf_dev, &pmf_dev->req); 351 if (ret) { 352 dev_err(pmf_dev->dev, "Failed to get v2 SBIOS requests: %d\n", ret); 353 return; 354 } 355 356 dev_dbg(pmf_dev->dev, "Pending request (preq): 0x%x\n", pmf_dev->req.pending_req); 357 358 amd_pmf_handle_early_preq(pmf_dev); 359 } 360 361 static void apmf_event_handler_v1(acpi_handle handle, u32 event, void *data) 362 { 363 struct amd_pmf_dev *pmf_dev = data; 364 int ret; 365 366 guard(mutex)(&pmf_dev->cb_mutex); 367 368 ret = apmf_get_sbios_requests_v1(pmf_dev, &pmf_dev->req1); 369 if (ret) { 370 dev_err(pmf_dev->dev, "Failed to get v1 SBIOS requests: %d\n", ret); 371 return; 372 } 373 374 dev_dbg(pmf_dev->dev, "Pending request (preq1): 0x%x\n", pmf_dev->req1.pending_req); 375 376 amd_pmf_handle_early_preq(pmf_dev); 377 } 378 379 static void apmf_event_handler(acpi_handle handle, u32 event, void *data) 380 { 381 struct amd_pmf_dev *pmf_dev = data; 382 struct apmf_sbios_req req; 383 int ret; 384 385 guard(mutex)(&pmf_dev->update_mutex); 386 ret = apmf_get_sbios_requests(pmf_dev, &req); 387 if (ret) { 388 dev_err(pmf_dev->dev, "Failed to get SBIOS requests:%d\n", ret); 389 return; 390 } 391 392 if (req.pending_req & BIT(APMF_AMT_NOTIFICATION)) { 393 dev_dbg(pmf_dev->dev, "AMT is supported and notifications %s\n", 394 req.amt_event ? "Enabled" : "Disabled"); 395 pmf_dev->amt_enabled = !!req.amt_event; 396 397 if (pmf_dev->amt_enabled) 398 amd_pmf_handle_amt(pmf_dev); 399 else 400 amd_pmf_reset_amt(pmf_dev); 401 } 402 403 if (req.pending_req & BIT(APMF_CQL_NOTIFICATION)) { 404 dev_dbg(pmf_dev->dev, "CQL is supported and notifications %s\n", 405 req.cql_event ? "Enabled" : "Disabled"); 406 407 /* update the target mode information */ 408 if (pmf_dev->amt_enabled) 409 amd_pmf_update_2_cql(pmf_dev, req.cql_event); 410 } 411 } 412 413 static int apmf_if_verify_interface(struct amd_pmf_dev *pdev) 414 { 415 struct apmf_verify_interface output; 416 int err; 417 418 err = apmf_if_call_store_buffer(pdev, APMF_FUNC_VERIFY_INTERFACE, &output, sizeof(output)); 419 if (err) 420 return err; 421 422 /* only set if not already set by a quirk */ 423 if (!pdev->supported_func) 424 pdev->supported_func = output.supported_functions; 425 426 dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x version:%u\n", 427 output.supported_functions, output.notification_mask, output.version); 428 429 pdev->pmf_if_version = output.version; 430 431 pdev->notifications = output.notification_mask; 432 return 0; 433 } 434 435 static int apmf_get_system_params(struct amd_pmf_dev *dev) 436 { 437 struct apmf_system_params params; 438 int err; 439 440 if (!is_apmf_func_supported(dev, APMF_FUNC_GET_SYS_PARAMS)) 441 return -EINVAL; 442 443 err = apmf_if_call_store_buffer(dev, APMF_FUNC_GET_SYS_PARAMS, ¶ms, sizeof(params)); 444 if (err) 445 return err; 446 447 dev_dbg(dev->dev, "system params mask:0x%x flags:0x%x cmd_code:0x%x heartbeat:%d\n", 448 params.valid_mask, 449 params.flags, 450 params.command_code, 451 params.heartbeat_int); 452 params.flags = params.flags & params.valid_mask; 453 dev->hb_interval = params.heartbeat_int; 454 455 return 0; 456 } 457 458 int apmf_get_dyn_slider_def_ac(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data) 459 { 460 return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_AC, data, sizeof(*data)); 461 } 462 463 int apmf_get_dyn_slider_def_dc(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data) 464 { 465 return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_DC, data, sizeof(*data)); 466 } 467 468 static apmf_event_handler_t apmf_event_handlers[] = { 469 [PMF_IF_V1] = apmf_event_handler_v1, 470 [PMF_IF_V2] = apmf_event_handler_v2, 471 }; 472 473 int apmf_install_handler(struct amd_pmf_dev *pmf_dev) 474 { 475 acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev); 476 acpi_status status; 477 478 /* Install the APMF Notify handler */ 479 if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) && 480 is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS)) { 481 status = acpi_install_notify_handler(ahandle, ACPI_ALL_NOTIFY, 482 apmf_event_handler, pmf_dev); 483 if (ACPI_FAILURE(status)) { 484 dev_err(pmf_dev->dev, "failed to install notify handler\n"); 485 return -ENODEV; 486 } 487 488 /* Call the handler once manually to catch up with possibly missed notifies. */ 489 apmf_event_handler(ahandle, 0, pmf_dev); 490 } 491 492 if (!pmf_dev->smart_pc_enabled) 493 return -EINVAL; 494 495 switch (pmf_dev->pmf_if_version) { 496 case PMF_IF_V1: 497 if (!is_apmf_bios_input_notifications_supported(pmf_dev)) 498 break; 499 fallthrough; 500 case PMF_IF_V2: 501 status = acpi_install_notify_handler(ahandle, ACPI_ALL_NOTIFY, 502 apmf_event_handlers[pmf_dev->pmf_if_version], pmf_dev); 503 if (ACPI_FAILURE(status)) { 504 dev_err(pmf_dev->dev, 505 "failed to install notify handler v%d for custom BIOS inputs\n", 506 pmf_dev->pmf_if_version); 507 return -ENODEV; 508 } 509 break; 510 default: 511 break; 512 } 513 514 return 0; 515 } 516 517 int apmf_check_smart_pc(struct amd_pmf_dev *pmf_dev) 518 { 519 struct platform_device *pdev = to_platform_device(pmf_dev->dev); 520 521 pmf_dev->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 522 if (!pmf_dev->res) { 523 dev_dbg(pmf_dev->dev, "Failed to get I/O memory resource\n"); 524 return -EINVAL; 525 } 526 527 pmf_dev->policy_addr = pmf_dev->res->start; 528 /* 529 * We cannot use resource_size() here because it adds an extra byte to round off the size. 530 * In the case of PMF ResourceTemplate(), this rounding is already handled within the _CRS. 531 * Using resource_size() would increase the resource size by 1, causing a mismatch with the 532 * length field and leading to issues. Therefore, simply use end-start of the ACPI resource 533 * to obtain the actual length. 534 */ 535 pmf_dev->policy_sz = pmf_dev->res->end - pmf_dev->res->start; 536 537 if (!pmf_dev->policy_addr || pmf_dev->policy_sz > POLICY_BUF_MAX_SZ || 538 pmf_dev->policy_sz == 0) { 539 dev_err(pmf_dev->dev, "Incorrect policy params, possibly a SBIOS bug\n"); 540 return -EINVAL; 541 } 542 543 return 0; 544 } 545 546 int amd_pmf_smartpc_apply_bios_output(struct amd_pmf_dev *dev, u32 val, u32 preq, u32 idx) 547 { 548 if (!is_apmf_func_supported(dev, APMF_FUNC_NOTIFY_SMART_PC_UPDATES)) 549 return -EINVAL; 550 551 return apmf_notify_smart_pc_update(dev, val, preq, idx); 552 } 553 554 void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev) 555 { 556 acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev); 557 558 if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1) 559 cancel_delayed_work_sync(&pmf_dev->heart_beat); 560 561 if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) && 562 is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS)) 563 acpi_remove_notify_handler(ahandle, ACPI_ALL_NOTIFY, apmf_event_handler); 564 565 if (!pmf_dev->smart_pc_enabled) 566 return; 567 568 switch (pmf_dev->pmf_if_version) { 569 case PMF_IF_V1: 570 if (!is_apmf_bios_input_notifications_supported(pmf_dev)) 571 break; 572 fallthrough; 573 case PMF_IF_V2: 574 acpi_remove_notify_handler(ahandle, ACPI_ALL_NOTIFY, 575 apmf_event_handlers[pmf_dev->pmf_if_version]); 576 break; 577 default: 578 break; 579 } 580 } 581 582 int apmf_acpi_init(struct amd_pmf_dev *pmf_dev) 583 { 584 int ret; 585 586 ret = apmf_if_verify_interface(pmf_dev); 587 if (ret) { 588 dev_err(pmf_dev->dev, "APMF verify interface failed :%d\n", ret); 589 goto out; 590 } 591 592 ret = apmf_get_system_params(pmf_dev); 593 if (ret) { 594 dev_dbg(pmf_dev->dev, "APMF apmf_get_system_params failed :%d\n", ret); 595 goto out; 596 } 597 598 if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1) { 599 /* send heartbeats only if the interval is not zero */ 600 INIT_DELAYED_WORK(&pmf_dev->heart_beat, apmf_sbios_heartbeat_notify); 601 schedule_delayed_work(&pmf_dev->heart_beat, 0); 602 } 603 604 out: 605 return ret; 606 } 607