drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright 2012 Advanced Micro Devices, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include <linux/pci.h>
  26 #include <linux/acpi.h>
  27 #include <linux/backlight.h>
  28 #include <linux/slab.h>
  29 #include <linux/xarray.h>
  30 #include <linux/power_supply.h>
  31 #include <linux/pm_runtime.h>
  32 #include <linux/suspend.h>
  33 #include <acpi/video.h>
  34 #include <acpi/actbl.h>
  35
  36 #include "amdgpu.h"
  37 #include "amdgpu_pm.h"
  38 #include "amdgpu_display.h"
  39 #include "amd_acpi.h"
  40 #include "atom.h"
  41
  42 /* Declare GUID for AMD _DSM method for XCCs */
  43 static const guid_t amd_xcc_dsm_guid = GUID_INIT(0x8267f5d5, 0xa556, 0x44f2,
  44                                                  0xb8, 0xb4, 0x45, 0x56, 0x2e,
  45                                                  0x8c, 0x5b, 0xec);
  46
  47 #define AMD_XCC_HID_START 3000
  48 #define AMD_XCC_DSM_GET_NUM_FUNCS 0
  49 #define AMD_XCC_DSM_GET_SUPP_MODE 1
  50 #define AMD_XCC_DSM_GET_XCP_MODE 2
  51 #define AMD_XCC_DSM_GET_VF_XCC_MAPPING 4
  52 #define AMD_XCC_DSM_GET_TMR_INFO 5
  53 #define AMD_XCC_DSM_NUM_FUNCS 5
  54
  55 #define AMD_XCC_MAX_HID 24
  56
  57 struct xarray numa_info_xa;
  58
  59 /* Encapsulates the XCD acpi object information */
  60 struct amdgpu_acpi_xcc_info {
  61         struct list_head list;
  62         struct amdgpu_numa_info *numa_info;
  63         uint8_t xcp_node;
  64         uint8_t phy_id;
  65         acpi_handle handle;
  66 };
  67
  68 struct amdgpu_acpi_dev_info {
  69         struct list_head list;
  70         struct list_head xcc_list;
  71         uint32_t sbdf;
  72         uint16_t supp_xcp_mode;
  73         uint16_t xcp_mode;
  74         uint16_t mem_mode;
  75         uint64_t tmr_base;
  76         uint64_t tmr_size;
  77 };
  78
  79 struct list_head amdgpu_acpi_dev_list;
  80
  81 struct amdgpu_atif_notification_cfg {
  82         bool enabled;
  83         int command_code;
  84 };
  85
  86 struct amdgpu_atif_notifications {
  87         bool thermal_state;
  88         bool forced_power_state;
  89         bool system_power_state;
  90         bool brightness_change;
  91         bool dgpu_display_event;
  92         bool gpu_package_power_limit;
  93 };
  94
  95 struct amdgpu_atif_functions {
  96         bool system_params;
  97         bool sbios_requests;
  98         bool temperature_change;
  99         bool query_backlight_transfer_characteristics;
 100         bool ready_to_undock;
 101         bool external_gpu_information;
 102 };
 103
 104 struct amdgpu_atif {
 105         acpi_handle handle;
 106
 107         struct amdgpu_atif_notifications notifications;
 108         struct amdgpu_atif_functions functions;
 109         struct amdgpu_atif_notification_cfg notification_cfg;
 110         struct backlight_device *bd;
 111         struct amdgpu_dm_backlight_caps backlight_caps;
 112 };
 113
 114 struct amdgpu_atcs_functions {
 115         bool get_ext_state;
 116         bool pcie_perf_req;
 117         bool pcie_dev_rdy;
 118         bool pcie_bus_width;
 119         bool power_shift_control;
 120 };
 121
 122 struct amdgpu_atcs {
 123         acpi_handle handle;
 124
 125         struct amdgpu_atcs_functions functions;
 126 };
 127
 128 static struct amdgpu_acpi_priv {
 129         struct amdgpu_atif atif;
 130         struct amdgpu_atcs atcs;
 131 } amdgpu_acpi_priv;
 132
 133 /* Call the ATIF method
 134  */
 135 /**
 136  * amdgpu_atif_call - call an ATIF method
 137  *
 138  * @atif: atif structure
 139  * @function: the ATIF function to execute
 140  * @params: ATIF function params
 141  *
 142  * Executes the requested ATIF function (all asics).
 143  * Returns a pointer to the acpi output buffer.
 144  */
 145 static union acpi_object *amdgpu_atif_call(struct amdgpu_atif *atif,
 146                                            int function,
 147                                            struct acpi_buffer *params)
 148 {
 149         acpi_status status;
 150         union acpi_object atif_arg_elements[2];
 151         struct acpi_object_list atif_arg;
 152         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 153
 154         atif_arg.count = 2;
 155         atif_arg.pointer = &atif_arg_elements[0];
 156
 157         atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
 158         atif_arg_elements[0].integer.value = function;
 159
 160         if (params) {
 161                 atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
 162                 atif_arg_elements[1].buffer.length = params->length;
 163                 atif_arg_elements[1].buffer.pointer = params->pointer;
 164         } else {
 165                 /* We need a second fake parameter */
 166                 atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
 167                 atif_arg_elements[1].integer.value = 0;
 168         }
 169
 170         status = acpi_evaluate_object(atif->handle, NULL, &atif_arg,
 171                                       &buffer);
 172
 173         /* Fail only if calling the method fails and ATIF is supported */
 174         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 175                 DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
 176                                  acpi_format_exception(status));
 177                 kfree(buffer.pointer);
 178                 return NULL;
 179         }
 180
 181         return buffer.pointer;
 182 }
 183
 184 /**
 185  * amdgpu_atif_parse_notification - parse supported notifications
 186  *
 187  * @n: supported notifications struct
 188  * @mask: supported notifications mask from ATIF
 189  *
 190  * Use the supported notifications mask from ATIF function
 191  * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
 192  * are supported (all asics).
 193  */
 194 static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
 195 {
 196         n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
 197         n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
 198         n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
 199         n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
 200         n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
 201         n->gpu_package_power_limit = mask & ATIF_GPU_PACKAGE_POWER_LIMIT_REQUEST_SUPPORTED;
 202 }
 203
 204 /**
 205  * amdgpu_atif_parse_functions - parse supported functions
 206  *
 207  * @f: supported functions struct
 208  * @mask: supported functions mask from ATIF
 209  *
 210  * Use the supported functions mask from ATIF function
 211  * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
 212  * are supported (all asics).
 213  */
 214 static void amdgpu_atif_parse_functions(struct amdgpu_atif_functions *f, u32 mask)
 215 {
 216         f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
 217         f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
 218         f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
 219         f->query_backlight_transfer_characteristics =
 220                 mask & ATIF_QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS_SUPPORTED;
 221         f->ready_to_undock = mask & ATIF_READY_TO_UNDOCK_NOTIFICATION_SUPPORTED;
 222         f->external_gpu_information = mask & ATIF_GET_EXTERNAL_GPU_INFORMATION_SUPPORTED;
 223 }
 224
 225 /**
 226  * amdgpu_atif_verify_interface - verify ATIF
 227  *
 228  * @atif: amdgpu atif struct
 229  *
 230  * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
 231  * to initialize ATIF and determine what features are supported
 232  * (all asics).
 233  * returns 0 on success, error on failure.
 234  */
 235 static int amdgpu_atif_verify_interface(struct amdgpu_atif *atif)
 236 {
 237         union acpi_object *info;
 238         struct atif_verify_interface output;
 239         size_t size;
 240         int err = 0;
 241
 242         info = amdgpu_atif_call(atif, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
 243         if (!info)
 244                 return -EIO;
 245
 246         memset(&output, 0, sizeof(output));
 247
 248         size = *(u16 *) info->buffer.pointer;
 249         if (size < 12) {
 250                 DRM_INFO("ATIF buffer is too small: %zu\n", size);
 251                 err = -EINVAL;
 252                 goto out;
 253         }
 254         size = min(sizeof(output), size);
 255
 256         memcpy(&output, info->buffer.pointer, size);
 257
 258         /* TODO: check version? */
 259         DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
 260
 261         amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
 262         amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
 263
 264 out:
 265         kfree(info);
 266         return err;
 267 }
 268
 269 /**
 270  * amdgpu_atif_get_notification_params - determine notify configuration
 271  *
 272  * @atif: acpi handle
 273  *
 274  * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
 275  * to determine if a notifier is used and if so which one
 276  * (all asics).  This is either Notify(VGA, 0x81) or Notify(VGA, n)
 277  * where n is specified in the result if a notifier is used.
 278  * Returns 0 on success, error on failure.
 279  */
 280 static int amdgpu_atif_get_notification_params(struct amdgpu_atif *atif)
 281 {
 282         union acpi_object *info;
 283         struct amdgpu_atif_notification_cfg *n = &atif->notification_cfg;
 284         struct atif_system_params params;
 285         size_t size;
 286         int err = 0;
 287
 288         info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS,
 289                                 NULL);
 290         if (!info) {
 291                 err = -EIO;
 292                 goto out;
 293         }
 294
 295         size = *(u16 *) info->buffer.pointer;
 296         if (size < 10) {
 297                 err = -EINVAL;
 298                 goto out;
 299         }
 300
 301         memset(&params, 0, sizeof(params));
 302         size = min(sizeof(params), size);
 303         memcpy(&params, info->buffer.pointer, size);
 304
 305         DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
 306                         params.flags, params.valid_mask);
 307         params.flags = params.flags & params.valid_mask;
 308
 309         if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
 310                 n->enabled = false;
 311                 n->command_code = 0;
 312         } else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
 313                 n->enabled = true;
 314                 n->command_code = 0x81;
 315         } else {
 316                 if (size < 11) {
 317                         err = -EINVAL;
 318                         goto out;
 319                 }
 320                 n->enabled = true;
 321                 n->command_code = params.command_code;
 322         }
 323
 324 out:
 325         DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
 326                         (n->enabled ? "enabled" : "disabled"),
 327                         n->command_code);
 328         kfree(info);
 329         return err;
 330 }
 331
 332 /**
 333  * amdgpu_atif_query_backlight_caps - get min and max backlight input signal
 334  *
 335  * @atif: acpi handle
 336  *
 337  * Execute the QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS ATIF function
 338  * to determine the acceptable range of backlight values
 339  *
 340  * Backlight_caps.caps_valid will be set to true if the query is successful
 341  *
 342  * The input signals are in range 0-255
 343  *
 344  * This function assumes the display with backlight is the first LCD
 345  *
 346  * Returns 0 on success, error on failure.
 347  */
 348 static int amdgpu_atif_query_backlight_caps(struct amdgpu_atif *atif)
 349 {
 350         union acpi_object *info;
 351         struct atif_qbtc_output characteristics;
 352         struct atif_qbtc_arguments arguments;
 353         struct acpi_buffer params;
 354         size_t size;
 355         int err = 0;
 356
 357         arguments.size = sizeof(arguments);
 358         arguments.requested_display = ATIF_QBTC_REQUEST_LCD1;
 359
 360         params.length = sizeof(arguments);
 361         params.pointer = (void *)&arguments;
 362
 363         info = amdgpu_atif_call(atif,
 364                 ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS,
 365                 &params);
 366         if (!info) {
 367                 err = -EIO;
 368                 goto out;
 369         }
 370
 371         size = *(u16 *) info->buffer.pointer;
 372         if (size < 10) {
 373                 err = -EINVAL;
 374                 goto out;
 375         }
 376
 377         memset(&characteristics, 0, sizeof(characteristics));
 378         size = min(sizeof(characteristics), size);
 379         memcpy(&characteristics, info->buffer.pointer, size);
 380
 381         atif->backlight_caps.caps_valid = true;
 382         atif->backlight_caps.min_input_signal =
 383                         characteristics.min_input_signal;
 384         atif->backlight_caps.max_input_signal =
 385                         characteristics.max_input_signal;
 386         atif->backlight_caps.ac_level = characteristics.ac_level;
 387         atif->backlight_caps.dc_level = characteristics.dc_level;
 388 out:
 389         kfree(info);
 390         return err;
 391 }
 392
 393 /**
 394  * amdgpu_atif_get_sbios_requests - get requested sbios event
 395  *
 396  * @atif: acpi handle
 397  * @req: atif sbios request struct
 398  *
 399  * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
 400  * to determine what requests the sbios is making to the driver
 401  * (all asics).
 402  * Returns 0 on success, error on failure.
 403  */
 404 static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif,
 405                                           struct atif_sbios_requests *req)
 406 {
 407         union acpi_object *info;
 408         size_t size;
 409         int count = 0;
 410
 411         info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS,
 412                                 NULL);
 413         if (!info)
 414                 return -EIO;
 415
 416         size = *(u16 *)info->buffer.pointer;
 417         if (size < 0xd) {
 418                 count = -EINVAL;
 419                 goto out;
 420         }
 421         memset(req, 0, sizeof(*req));
 422
 423         size = min(sizeof(*req), size);
 424         memcpy(req, info->buffer.pointer, size);
 425         DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
 426
 427         count = hweight32(req->pending);
 428
 429 out:
 430         kfree(info);
 431         return count;
 432 }
 433
 434 /**
 435  * amdgpu_atif_handler - handle ATIF notify requests
 436  *
 437  * @adev: amdgpu_device pointer
 438  * @event: atif sbios request struct
 439  *
 440  * Checks the acpi event and if it matches an atif event,
 441  * handles it.
 442  *
 443  * Returns:
 444  * NOTIFY_BAD or NOTIFY_DONE, depending on the event.
 445  */
 446 static int amdgpu_atif_handler(struct amdgpu_device *adev,
 447                                struct acpi_bus_event *event)
 448 {
 449         struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
 450         int count;
 451
 452         DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
 453                         event->device_class, event->type);
 454
 455         if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
 456                 return NOTIFY_DONE;
 457
 458         /* Is this actually our event? */
 459         if (!atif->notification_cfg.enabled ||
 460             event->type != atif->notification_cfg.command_code) {
 461                 /* These events will generate keypresses otherwise */
 462                 if (event->type == ACPI_VIDEO_NOTIFY_PROBE)
 463                         return NOTIFY_BAD;
 464                 else
 465                         return NOTIFY_DONE;
 466         }
 467
 468         if (atif->functions.sbios_requests) {
 469                 struct atif_sbios_requests req;
 470
 471                 /* Check pending SBIOS requests */
 472                 count = amdgpu_atif_get_sbios_requests(atif, &req);
 473
 474                 if (count <= 0)
 475                         return NOTIFY_BAD;
 476
 477                 DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
 478
 479                 if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
 480                         if (atif->bd) {
 481                                 DRM_DEBUG_DRIVER("Changing brightness to %d\n",
 482                                                  req.backlight_level);
 483                                 /*
 484                                  * XXX backlight_device_set_brightness() is
 485                                  * hardwired to post BACKLIGHT_UPDATE_SYSFS.
 486                                  * It probably should accept 'reason' parameter.
 487                                  */
 488                                 backlight_device_set_brightness(atif->bd, req.backlight_level);
 489                         }
 490                 }
 491
 492                 if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
 493                         if (adev->flags & AMD_IS_PX) {
 494                                 pm_runtime_get_sync(adev_to_drm(adev)->dev);
 495                                 /* Just fire off a uevent and let userspace tell us what to do */
 496                                 drm_helper_hpd_irq_event(adev_to_drm(adev));
 497                                 pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
 498                                 pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
 499                         }
 500                 }
 501                 /* TODO: check other events */
 502         }
 503
 504         /* We've handled the event, stop the notifier chain. The ACPI interface
 505          * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
 506          * userspace if the event was generated only to signal a SBIOS
 507          * request.
 508          */
 509         return NOTIFY_BAD;
 510 }
 511
 512 /* Call the ATCS method
 513  */
 514 /**
 515  * amdgpu_atcs_call - call an ATCS method
 516  *
 517  * @atcs: atcs structure
 518  * @function: the ATCS function to execute
 519  * @params: ATCS function params
 520  *
 521  * Executes the requested ATCS function (all asics).
 522  * Returns a pointer to the acpi output buffer.
 523  */
 524 static union acpi_object *amdgpu_atcs_call(struct amdgpu_atcs *atcs,
 525                                            int function,
 526                                            struct acpi_buffer *params)
 527 {
 528         acpi_status status;
 529         union acpi_object atcs_arg_elements[2];
 530         struct acpi_object_list atcs_arg;
 531         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 532
 533         atcs_arg.count = 2;
 534         atcs_arg.pointer = &atcs_arg_elements[0];
 535
 536         atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
 537         atcs_arg_elements[0].integer.value = function;
 538
 539         if (params) {
 540                 atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
 541                 atcs_arg_elements[1].buffer.length = params->length;
 542                 atcs_arg_elements[1].buffer.pointer = params->pointer;
 543         } else {
 544                 /* We need a second fake parameter */
 545                 atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
 546                 atcs_arg_elements[1].integer.value = 0;
 547         }
 548
 549         status = acpi_evaluate_object(atcs->handle, NULL, &atcs_arg, &buffer);
 550
 551         /* Fail only if calling the method fails and ATIF is supported */
 552         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
 553                 DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
 554                                  acpi_format_exception(status));
 555                 kfree(buffer.pointer);
 556                 return NULL;
 557         }
 558
 559         return buffer.pointer;
 560 }
 561
 562 /**
 563  * amdgpu_atcs_parse_functions - parse supported functions
 564  *
 565  * @f: supported functions struct
 566  * @mask: supported functions mask from ATCS
 567  *
 568  * Use the supported functions mask from ATCS function
 569  * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
 570  * are supported (all asics).
 571  */
 572 static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
 573 {
 574         f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
 575         f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
 576         f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
 577         f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
 578         f->power_shift_control = mask & ATCS_SET_POWER_SHIFT_CONTROL_SUPPORTED;
 579 }
 580
 581 /**
 582  * amdgpu_atcs_verify_interface - verify ATCS
 583  *
 584  * @atcs: amdgpu atcs struct
 585  *
 586  * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
 587  * to initialize ATCS and determine what features are supported
 588  * (all asics).
 589  * returns 0 on success, error on failure.
 590  */
 591 static int amdgpu_atcs_verify_interface(struct amdgpu_atcs *atcs)
 592 {
 593         union acpi_object *info;
 594         struct atcs_verify_interface output;
 595         size_t size;
 596         int err = 0;
 597
 598         info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
 599         if (!info)
 600                 return -EIO;
 601
 602         memset(&output, 0, sizeof(output));
 603
 604         size = *(u16 *) info->buffer.pointer;
 605         if (size < 8) {
 606                 DRM_INFO("ATCS buffer is too small: %zu\n", size);
 607                 err = -EINVAL;
 608                 goto out;
 609         }
 610         size = min(sizeof(output), size);
 611
 612         memcpy(&output, info->buffer.pointer, size);
 613
 614         /* TODO: check version? */
 615         DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
 616
 617         amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
 618
 619 out:
 620         kfree(info);
 621         return err;
 622 }
 623
 624 /**
 625  * amdgpu_acpi_is_pcie_performance_request_supported
 626  *
 627  * @adev: amdgpu_device pointer
 628  *
 629  * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
 630  * are supported (all asics).
 631  * returns true if supported, false if not.
 632  */
 633 bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
 634 {
 635         struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
 636
 637         if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
 638                 return true;
 639
 640         return false;
 641 }
 642
 643 /**
 644  * amdgpu_acpi_is_power_shift_control_supported
 645  *
 646  * Check if the ATCS power shift control method
 647  * is supported.
 648  * returns true if supported, false if not.
 649  */
 650 bool amdgpu_acpi_is_power_shift_control_supported(void)
 651 {
 652         return amdgpu_acpi_priv.atcs.functions.power_shift_control;
 653 }
 654
 655 /**
 656  * amdgpu_acpi_pcie_notify_device_ready
 657  *
 658  * @adev: amdgpu_device pointer
 659  *
 660  * Executes the PCIE_DEVICE_READY_NOTIFICATION method
 661  * (all asics).
 662  * returns 0 on success, error on failure.
 663  */
 664 int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
 665 {
 666         union acpi_object *info;
 667         struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
 668
 669         if (!atcs->functions.pcie_dev_rdy)
 670                 return -EINVAL;
 671
 672         info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
 673         if (!info)
 674                 return -EIO;
 675
 676         kfree(info);
 677
 678         return 0;
 679 }
 680
 681 /**
 682  * amdgpu_acpi_pcie_performance_request
 683  *
 684  * @adev: amdgpu_device pointer
 685  * @perf_req: requested perf level (pcie gen speed)
 686  * @advertise: set advertise caps flag if set
 687  *
 688  * Executes the PCIE_PERFORMANCE_REQUEST method to
 689  * change the pcie gen speed (all asics).
 690  * returns 0 on success, error on failure.
 691  */
 692 int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
 693                                          u8 perf_req, bool advertise)
 694 {
 695         union acpi_object *info;
 696         struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
 697         struct atcs_pref_req_input atcs_input;
 698         struct atcs_pref_req_output atcs_output;
 699         struct acpi_buffer params;
 700         size_t size;
 701         u32 retry = 3;
 702
 703         if (amdgpu_acpi_pcie_notify_device_ready(adev))
 704                 return -EINVAL;
 705
 706         if (!atcs->functions.pcie_perf_req)
 707                 return -EINVAL;
 708
 709         atcs_input.size = sizeof(struct atcs_pref_req_input);
 710         /* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
 711         atcs_input.client_id = pci_dev_id(adev->pdev);
 712         atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
 713         atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
 714         if (advertise)
 715                 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
 716         atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
 717         atcs_input.perf_req = perf_req;
 718
 719         params.length = sizeof(struct atcs_pref_req_input);
 720         params.pointer = &atcs_input;
 721
 722         while (retry--) {
 723                 info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, &params);
 724                 if (!info)
 725                         return -EIO;
 726
 727                 memset(&atcs_output, 0, sizeof(atcs_output));
 728
 729                 size = *(u16 *) info->buffer.pointer;
 730                 if (size < 3) {
 731                         DRM_INFO("ATCS buffer is too small: %zu\n", size);
 732                         kfree(info);
 733                         return -EINVAL;
 734                 }
 735                 size = min(sizeof(atcs_output), size);
 736
 737                 memcpy(&atcs_output, info->buffer.pointer, size);
 738
 739                 kfree(info);
 740
 741                 switch (atcs_output.ret_val) {
 742                 case ATCS_REQUEST_REFUSED:
 743                 default:
 744                         return -EINVAL;
 745                 case ATCS_REQUEST_COMPLETE:
 746                         return 0;
 747                 case ATCS_REQUEST_IN_PROGRESS:
 748                         udelay(10);
 749                         break;
 750                 }
 751         }
 752
 753         return 0;
 754 }
 755
 756 /**
 757  * amdgpu_acpi_power_shift_control
 758  *
 759  * @adev: amdgpu_device pointer
 760  * @dev_state: device acpi state
 761  * @drv_state: driver state
 762  *
 763  * Executes the POWER_SHIFT_CONTROL method to
 764  * communicate current dGPU device state and
 765  * driver state to APU/SBIOS.
 766  * returns 0 on success, error on failure.
 767  */
 768 int amdgpu_acpi_power_shift_control(struct amdgpu_device *adev,
 769                                     u8 dev_state, bool drv_state)
 770 {
 771         union acpi_object *info;
 772         struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
 773         struct atcs_pwr_shift_input atcs_input;
 774         struct acpi_buffer params;
 775
 776         if (!amdgpu_acpi_is_power_shift_control_supported())
 777                 return -EINVAL;
 778
 779         atcs_input.size = sizeof(struct atcs_pwr_shift_input);
 780         /* dGPU id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
 781         atcs_input.dgpu_id = pci_dev_id(adev->pdev);
 782         atcs_input.dev_acpi_state = dev_state;
 783         atcs_input.drv_state = drv_state;
 784
 785         params.length = sizeof(struct atcs_pwr_shift_input);
 786         params.pointer = &atcs_input;
 787
 788         info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_POWER_SHIFT_CONTROL, &params);
 789         if (!info) {
 790                 DRM_ERROR("ATCS PSC update failed\n");
 791                 return -EIO;
 792         }
 793
 794         return 0;
 795 }
 796
 797 /**
 798  * amdgpu_acpi_smart_shift_update - update dGPU device state to SBIOS
 799  *
 800  * @dev: drm_device pointer
 801  * @ss_state: current smart shift event
 802  *
 803  * returns 0 on success,
 804  * otherwise return error number.
 805  */
 806 int amdgpu_acpi_smart_shift_update(struct drm_device *dev, enum amdgpu_ss ss_state)
 807 {
 808         struct amdgpu_device *adev = drm_to_adev(dev);
 809         int r;
 810
 811         if (!amdgpu_device_supports_smart_shift(dev))
 812                 return 0;
 813
 814         switch (ss_state) {
 815         /* SBIOS trigger “stop”, “enable” and “start” at D0, Driver Operational.
 816          * SBIOS trigger “stop” at D3, Driver Not Operational.
 817          * SBIOS trigger “stop” and “disable” at D0, Driver NOT operational.
 818          */
 819         case AMDGPU_SS_DRV_LOAD:
 820                 r = amdgpu_acpi_power_shift_control(adev,
 821                                                     AMDGPU_ATCS_PSC_DEV_STATE_D0,
 822                                                     AMDGPU_ATCS_PSC_DRV_STATE_OPR);
 823                 break;
 824         case AMDGPU_SS_DEV_D0:
 825                 r = amdgpu_acpi_power_shift_control(adev,
 826                                                     AMDGPU_ATCS_PSC_DEV_STATE_D0,
 827                                                     AMDGPU_ATCS_PSC_DRV_STATE_OPR);
 828                 break;
 829         case AMDGPU_SS_DEV_D3:
 830                 r = amdgpu_acpi_power_shift_control(adev,
 831                                                     AMDGPU_ATCS_PSC_DEV_STATE_D3_HOT,
 832                                                     AMDGPU_ATCS_PSC_DRV_STATE_NOT_OPR);
 833                 break;
 834         case AMDGPU_SS_DRV_UNLOAD:
 835                 r = amdgpu_acpi_power_shift_control(adev,
 836                                                     AMDGPU_ATCS_PSC_DEV_STATE_D0,
 837                                                     AMDGPU_ATCS_PSC_DRV_STATE_NOT_OPR);
 838                 break;
 839         default:
 840                 return -EINVAL;
 841         }
 842
 843         return r;
 844 }
 845
 846 #ifdef CONFIG_ACPI_NUMA
 847 static inline uint64_t amdgpu_acpi_get_numa_size(int nid)
 848 {
 849         /* This is directly using si_meminfo_node implementation as the
 850          * function is not exported.
 851          */
 852         int zone_type;
 853         uint64_t managed_pages = 0;
 854
 855         pg_data_t *pgdat = NODE_DATA(nid);
 856
 857         for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++)
 858                 managed_pages +=
 859                         zone_managed_pages(&pgdat->node_zones[zone_type]);
 860         return managed_pages * PAGE_SIZE;
 861 }
 862
 863 static struct amdgpu_numa_info *amdgpu_acpi_get_numa_info(uint32_t pxm)
 864 {
 865         struct amdgpu_numa_info *numa_info;
 866         int nid;
 867
 868         numa_info = xa_load(&numa_info_xa, pxm);
 869
 870         if (!numa_info) {
 871                 struct sysinfo info;
 872
 873                 numa_info = kzalloc(sizeof(*numa_info), GFP_KERNEL);
 874                 if (!numa_info)
 875                         return NULL;
 876
 877                 nid = pxm_to_node(pxm);
 878                 numa_info->pxm = pxm;
 879                 numa_info->nid = nid;
 880
 881                 if (numa_info->nid == NUMA_NO_NODE) {
 882                         si_meminfo(&info);
 883                         numa_info->size = info.totalram * info.mem_unit;
 884                 } else {
 885                         numa_info->size = amdgpu_acpi_get_numa_size(nid);
 886                 }
 887                 xa_store(&numa_info_xa, numa_info->pxm, numa_info, GFP_KERNEL);
 888         }
 889
 890         return numa_info;
 891 }
 892 #endif
 893
 894 /**
 895  * amdgpu_acpi_get_node_id - obtain the NUMA node id for corresponding amdgpu
 896  * acpi device handle
 897  *
 898  * @handle: acpi handle
 899  * @numa_info: amdgpu_numa_info structure holding numa information
 900  *
 901  * Queries the ACPI interface to fetch the corresponding NUMA Node ID for a
 902  * given amdgpu acpi device.
 903  *
 904  * Returns ACPI STATUS OK with Node ID on success or the corresponding failure reason
 905  */
 906 static acpi_status amdgpu_acpi_get_node_id(acpi_handle handle,
 907                                     struct amdgpu_numa_info **numa_info)
 908 {
 909 #ifdef CONFIG_ACPI_NUMA
 910         u64 pxm;
 911         acpi_status status;
 912
 913         if (!numa_info)
 914                 return_ACPI_STATUS(AE_ERROR);
 915
 916         status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 917
 918         if (ACPI_FAILURE(status))
 919                 return status;
 920
 921         *numa_info = amdgpu_acpi_get_numa_info(pxm);
 922
 923         if (!*numa_info)
 924                 return_ACPI_STATUS(AE_ERROR);
 925
 926         return_ACPI_STATUS(AE_OK);
 927 #else
 928         return_ACPI_STATUS(AE_NOT_EXIST);
 929 #endif
 930 }
 931
 932 static struct amdgpu_acpi_dev_info *amdgpu_acpi_get_dev(u32 sbdf)
 933 {
 934         struct amdgpu_acpi_dev_info *acpi_dev;
 935
 936         if (list_empty(&amdgpu_acpi_dev_list))
 937                 return NULL;
 938
 939         list_for_each_entry(acpi_dev, &amdgpu_acpi_dev_list, list)
 940                 if (acpi_dev->sbdf == sbdf)
 941                         return acpi_dev;
 942
 943         return NULL;
 944 }
 945
 946 static int amdgpu_acpi_dev_init(struct amdgpu_acpi_dev_info **dev_info,
 947                                 struct amdgpu_acpi_xcc_info *xcc_info, u32 sbdf)
 948 {
 949         struct amdgpu_acpi_dev_info *tmp;
 950         union acpi_object *obj;
 951         int ret = -ENOENT;
 952
 953         *dev_info = NULL;
 954         tmp = kzalloc(sizeof(struct amdgpu_acpi_dev_info), GFP_KERNEL);
 955         if (!tmp)
 956                 return -ENOMEM;
 957
 958         INIT_LIST_HEAD(&tmp->xcc_list);
 959         INIT_LIST_HEAD(&tmp->list);
 960         tmp->sbdf = sbdf;
 961
 962         obj = acpi_evaluate_dsm_typed(xcc_info->handle, &amd_xcc_dsm_guid, 0,
 963                                       AMD_XCC_DSM_GET_SUPP_MODE, NULL,
 964                                       ACPI_TYPE_INTEGER);
 965
 966         if (!obj) {
 967                 acpi_handle_debug(xcc_info->handle,
 968                                   "_DSM function %d evaluation failed",
 969                                   AMD_XCC_DSM_GET_SUPP_MODE);
 970                 ret = -ENOENT;
 971                 goto out;
 972         }
 973
 974         tmp->supp_xcp_mode = obj->integer.value & 0xFFFF;
 975         ACPI_FREE(obj);
 976
 977         obj = acpi_evaluate_dsm_typed(xcc_info->handle, &amd_xcc_dsm_guid, 0,
 978                                       AMD_XCC_DSM_GET_XCP_MODE, NULL,
 979                                       ACPI_TYPE_INTEGER);
 980
 981         if (!obj) {
 982                 acpi_handle_debug(xcc_info->handle,
 983                                   "_DSM function %d evaluation failed",
 984                                   AMD_XCC_DSM_GET_XCP_MODE);
 985                 ret = -ENOENT;
 986                 goto out;
 987         }
 988
 989         tmp->xcp_mode = obj->integer.value & 0xFFFF;
 990         tmp->mem_mode = (obj->integer.value >> 32) & 0xFFFF;
 991         ACPI_FREE(obj);
 992
 993         /* Evaluate DSMs and fill XCC information */
 994         obj = acpi_evaluate_dsm_typed(xcc_info->handle, &amd_xcc_dsm_guid, 0,
 995                                       AMD_XCC_DSM_GET_TMR_INFO, NULL,
 996                                       ACPI_TYPE_PACKAGE);
 997
 998         if (!obj || obj->package.count < 2) {
 999                 acpi_handle_debug(xcc_info->handle,
1000                                   "_DSM function %d evaluation failed",
1001                                   AMD_XCC_DSM_GET_TMR_INFO);
1002                 ret = -ENOENT;
1003                 goto out;
1004         }
1005
1006         tmp->tmr_base = obj->package.elements[0].integer.value;
1007         tmp->tmr_size = obj->package.elements[1].integer.value;
1008         ACPI_FREE(obj);
1009
1010         DRM_DEBUG_DRIVER(
1011                 "New dev(%x): Supported xcp mode: %x curr xcp_mode : %x mem mode : %x, tmr base: %llx tmr size: %llx  ",
1012                 tmp->sbdf, tmp->supp_xcp_mode, tmp->xcp_mode, tmp->mem_mode,
1013                 tmp->tmr_base, tmp->tmr_size);
1014         list_add_tail(&tmp->list, &amdgpu_acpi_dev_list);
1015         *dev_info = tmp;
1016
1017         return 0;
1018
1019 out:
1020         if (obj)
1021                 ACPI_FREE(obj);
1022         kfree(tmp);
1023
1024         return ret;
1025 }
1026
1027 static int amdgpu_acpi_get_xcc_info(struct amdgpu_acpi_xcc_info *xcc_info,
1028                                     u32 *sbdf)
1029 {
1030         union acpi_object *obj;
1031         acpi_status status;
1032         int ret = -ENOENT;
1033
1034         obj = acpi_evaluate_dsm_typed(xcc_info->handle, &amd_xcc_dsm_guid, 0,
1035                                       AMD_XCC_DSM_GET_NUM_FUNCS, NULL,
1036                                       ACPI_TYPE_INTEGER);
1037
1038         if (!obj || obj->integer.value != AMD_XCC_DSM_NUM_FUNCS)
1039                 goto out;
1040         ACPI_FREE(obj);
1041
1042         /* Evaluate DSMs and fill XCC information */
1043         obj = acpi_evaluate_dsm_typed(xcc_info->handle, &amd_xcc_dsm_guid, 0,
1044                                       AMD_XCC_DSM_GET_VF_XCC_MAPPING, NULL,
1045                                       ACPI_TYPE_INTEGER);
1046
1047         if (!obj) {
1048                 acpi_handle_debug(xcc_info->handle,
1049                                   "_DSM function %d evaluation failed",
1050                                   AMD_XCC_DSM_GET_VF_XCC_MAPPING);
1051                 ret = -EINVAL;
1052                 goto out;
1053         }
1054
1055         /* PF xcc id [39:32] */
1056         xcc_info->phy_id = (obj->integer.value >> 32) & 0xFF;
1057         /* xcp node of this xcc [47:40] */
1058         xcc_info->xcp_node = (obj->integer.value >> 40) & 0xFF;
1059         /* PF domain of this xcc [31:16] */
1060         *sbdf = (obj->integer.value) & 0xFFFF0000;
1061         /* PF bus/dev/fn of this xcc [63:48] */
1062         *sbdf |= (obj->integer.value >> 48) & 0xFFFF;
1063         ACPI_FREE(obj);
1064         obj = NULL;
1065
1066         status =
1067                 amdgpu_acpi_get_node_id(xcc_info->handle, &xcc_info->numa_info);
1068
1069         /* TODO: check if this check is required */
1070         if (ACPI_SUCCESS(status))
1071                 ret = 0;
1072 out:
1073         if (obj)
1074                 ACPI_FREE(obj);
1075
1076         return ret;
1077 }
1078
1079 static int amdgpu_acpi_enumerate_xcc(void)
1080 {
1081         struct amdgpu_acpi_dev_info *dev_info = NULL;
1082         struct amdgpu_acpi_xcc_info *xcc_info;
1083         struct acpi_device *acpi_dev;
1084         char hid[ACPI_ID_LEN];
1085         int ret, id;
1086         u32 sbdf;
1087
1088         INIT_LIST_HEAD(&amdgpu_acpi_dev_list);
1089         xa_init(&numa_info_xa);
1090
1091         for (id = 0; id < AMD_XCC_MAX_HID; id++) {
1092                 sprintf(hid, "%s%d", "AMD", AMD_XCC_HID_START + id);
1093                 acpi_dev = acpi_dev_get_first_match_dev(hid, NULL, -1);
1094                 /* These ACPI objects are expected to be in sequential order. If
1095                  * one is not found, no need to check the rest.
1096                  */
1097                 if (!acpi_dev) {
1098                         DRM_DEBUG_DRIVER("No matching acpi device found for %s",
1099                                          hid);
1100                         break;
1101                 }
1102
1103                 xcc_info = kzalloc(sizeof(struct amdgpu_acpi_xcc_info),
1104                                    GFP_KERNEL);
1105                 if (!xcc_info) {
1106                         DRM_ERROR("Failed to allocate memory for xcc info\n");
1107                         return -ENOMEM;
1108                 }
1109
1110                 INIT_LIST_HEAD(&xcc_info->list);
1111                 xcc_info->handle = acpi_device_handle(acpi_dev);
1112                 acpi_dev_put(acpi_dev);
1113
1114                 ret = amdgpu_acpi_get_xcc_info(xcc_info, &sbdf);
1115                 if (ret) {
1116                         kfree(xcc_info);
1117                         continue;
1118                 }
1119
1120                 dev_info = amdgpu_acpi_get_dev(sbdf);
1121
1122                 if (!dev_info)
1123                         ret = amdgpu_acpi_dev_init(&dev_info, xcc_info, sbdf);
1124
1125                 if (ret == -ENOMEM)
1126                         return ret;
1127
1128                 if (!dev_info) {
1129                         kfree(xcc_info);
1130                         continue;
1131                 }
1132
1133                 list_add_tail(&xcc_info->list, &dev_info->xcc_list);
1134         }
1135
1136         return 0;
1137 }
1138
1139 int amdgpu_acpi_get_tmr_info(struct amdgpu_device *adev, u64 *tmr_offset,
1140                              u64 *tmr_size)
1141 {
1142         struct amdgpu_acpi_dev_info *dev_info;
1143         u32 sbdf;
1144
1145         if (!tmr_offset || !tmr_size)
1146                 return -EINVAL;
1147
1148         sbdf = (pci_domain_nr(adev->pdev->bus) << 16);
1149         sbdf |= pci_dev_id(adev->pdev);
1150         dev_info = amdgpu_acpi_get_dev(sbdf);
1151         if (!dev_info)
1152                 return -ENOENT;
1153
1154         *tmr_offset = dev_info->tmr_base;
1155         *tmr_size = dev_info->tmr_size;
1156
1157         return 0;
1158 }
1159
1160 int amdgpu_acpi_get_mem_info(struct amdgpu_device *adev, int xcc_id,
1161                              struct amdgpu_numa_info *numa_info)
1162 {
1163         struct amdgpu_acpi_dev_info *dev_info;
1164         struct amdgpu_acpi_xcc_info *xcc_info;
1165         u32 sbdf;
1166
1167         if (!numa_info)
1168                 return -EINVAL;
1169
1170         sbdf = (pci_domain_nr(adev->pdev->bus) << 16);
1171         sbdf |= pci_dev_id(adev->pdev);
1172         dev_info = amdgpu_acpi_get_dev(sbdf);
1173         if (!dev_info)
1174                 return -ENOENT;
1175
1176         list_for_each_entry(xcc_info, &dev_info->xcc_list, list) {
1177                 if (xcc_info->phy_id == xcc_id) {
1178                         memcpy(numa_info, xcc_info->numa_info,
1179                                sizeof(*numa_info));
1180                         return 0;
1181                 }
1182         }
1183
1184         return -ENOENT;
1185 }
1186
1187 /**
1188  * amdgpu_acpi_event - handle notify events
1189  *
1190  * @nb: notifier block
1191  * @val: val
1192  * @data: acpi event
1193  *
1194  * Calls relevant amdgpu functions in response to various
1195  * acpi events.
1196  * Returns NOTIFY code
1197  */
1198 static int amdgpu_acpi_event(struct notifier_block *nb,
1199                              unsigned long val,
1200                              void *data)
1201 {
1202         struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
1203         struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
1204
1205         if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
1206                 if (power_supply_is_system_supplied() > 0)
1207                         DRM_DEBUG_DRIVER("pm: AC\n");
1208                 else
1209                         DRM_DEBUG_DRIVER("pm: DC\n");
1210
1211                 amdgpu_pm_acpi_event_handler(adev);
1212         }
1213
1214         /* Check for pending SBIOS requests */
1215         return amdgpu_atif_handler(adev, entry);
1216 }
1217
1218 /* Call all ACPI methods here */
1219 /**
1220  * amdgpu_acpi_init - init driver acpi support
1221  *
1222  * @adev: amdgpu_device pointer
1223  *
1224  * Verifies the AMD ACPI interfaces and registers with the acpi
1225  * notifier chain (all asics).
1226  * Returns 0 on success, error on failure.
1227  */
1228 int amdgpu_acpi_init(struct amdgpu_device *adev)
1229 {
1230         struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
1231
1232         if (atif->notifications.brightness_change) {
1233                 if (adev->dc_enabled) {
1234 #if defined(CONFIG_DRM_AMD_DC)
1235                         struct amdgpu_display_manager *dm = &adev->dm;
1236
1237                         if (dm->backlight_dev[0])
1238                                 atif->bd = dm->backlight_dev[0];
1239 #endif
1240                 } else {
1241                         struct drm_encoder *tmp;
1242
1243                         /* Find the encoder controlling the brightness */
1244                         list_for_each_entry(tmp, &adev_to_drm(adev)->mode_config.encoder_list,
1245                                             head) {
1246                                 struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
1247
1248                                 if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
1249                                     enc->enc_priv) {
1250                                         struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
1251
1252                                         if (dig->bl_dev) {
1253                                                 atif->bd = dig->bl_dev;
1254                                                 break;
1255                                         }
1256                                 }
1257                         }
1258                 }
1259         }
1260         adev->acpi_nb.notifier_call = amdgpu_acpi_event;
1261         register_acpi_notifier(&adev->acpi_nb);
1262
1263         return 0;
1264 }
1265
1266 void amdgpu_acpi_get_backlight_caps(struct amdgpu_dm_backlight_caps *caps)
1267 {
1268         struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
1269
1270         caps->caps_valid = atif->backlight_caps.caps_valid;
1271         caps->min_input_signal = atif->backlight_caps.min_input_signal;
1272         caps->max_input_signal = atif->backlight_caps.max_input_signal;
1273         caps->ac_level = atif->backlight_caps.ac_level;
1274         caps->dc_level = atif->backlight_caps.dc_level;
1275 }
1276
1277 /**
1278  * amdgpu_acpi_fini - tear down driver acpi support
1279  *
1280  * @adev: amdgpu_device pointer
1281  *
1282  * Unregisters with the acpi notifier chain (all asics).
1283  */
1284 void amdgpu_acpi_fini(struct amdgpu_device *adev)
1285 {
1286         unregister_acpi_notifier(&adev->acpi_nb);
1287 }
1288
1289 /**
1290  * amdgpu_atif_pci_probe_handle - look up the ATIF handle
1291  *
1292  * @pdev: pci device
1293  *
1294  * Look up the ATIF handles (all asics).
1295  * Returns true if the handle is found, false if not.
1296  */
1297 static bool amdgpu_atif_pci_probe_handle(struct pci_dev *pdev)
1298 {
1299         char acpi_method_name[255] = { 0 };
1300         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
1301         acpi_handle dhandle, atif_handle;
1302         acpi_status status;
1303         int ret;
1304
1305         dhandle = ACPI_HANDLE(&pdev->dev);
1306         if (!dhandle)
1307                 return false;
1308
1309         status = acpi_get_handle(dhandle, "ATIF", &atif_handle);
1310         if (ACPI_FAILURE(status))
1311                 return false;
1312
1313         amdgpu_acpi_priv.atif.handle = atif_handle;
1314         acpi_get_name(amdgpu_acpi_priv.atif.handle, ACPI_FULL_PATHNAME, &buffer);
1315         DRM_DEBUG_DRIVER("Found ATIF handle %s\n", acpi_method_name);
1316         ret = amdgpu_atif_verify_interface(&amdgpu_acpi_priv.atif);
1317         if (ret) {
1318                 amdgpu_acpi_priv.atif.handle = 0;
1319                 return false;
1320         }
1321         return true;
1322 }
1323
1324 /**
1325  * amdgpu_atcs_pci_probe_handle - look up the ATCS handle
1326  *
1327  * @pdev: pci device
1328  *
1329  * Look up the ATCS handles (all asics).
1330  * Returns true if the handle is found, false if not.
1331  */
1332 static bool amdgpu_atcs_pci_probe_handle(struct pci_dev *pdev)
1333 {
1334         char acpi_method_name[255] = { 0 };
1335         struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name };
1336         acpi_handle dhandle, atcs_handle;
1337         acpi_status status;
1338         int ret;
1339
1340         dhandle = ACPI_HANDLE(&pdev->dev);
1341         if (!dhandle)
1342                 return false;
1343
1344         status = acpi_get_handle(dhandle, "ATCS", &atcs_handle);
1345         if (ACPI_FAILURE(status))
1346                 return false;
1347
1348         amdgpu_acpi_priv.atcs.handle = atcs_handle;
1349         acpi_get_name(amdgpu_acpi_priv.atcs.handle, ACPI_FULL_PATHNAME, &buffer);
1350         DRM_DEBUG_DRIVER("Found ATCS handle %s\n", acpi_method_name);
1351         ret = amdgpu_atcs_verify_interface(&amdgpu_acpi_priv.atcs);
1352         if (ret) {
1353                 amdgpu_acpi_priv.atcs.handle = 0;
1354                 return false;
1355         }
1356         return true;
1357 }
1358
1359
1360 /**
1361  * amdgpu_acpi_should_gpu_reset
1362  *
1363  * @adev: amdgpu_device_pointer
1364  *
1365  * returns true if should reset GPU, false if not
1366  */
1367 bool amdgpu_acpi_should_gpu_reset(struct amdgpu_device *adev)
1368 {
1369         if ((adev->flags & AMD_IS_APU) &&
1370             adev->gfx.imu.funcs) /* Not need to do mode2 reset for IMU enabled APUs */
1371                 return false;
1372
1373         if ((adev->flags & AMD_IS_APU) &&
1374             amdgpu_acpi_is_s3_active(adev))
1375                 return false;
1376
1377         if (amdgpu_sriov_vf(adev))
1378                 return false;
1379
1380 #if IS_ENABLED(CONFIG_SUSPEND)
1381         return pm_suspend_target_state != PM_SUSPEND_TO_IDLE;
1382 #else
1383         return true;
1384 #endif
1385 }
1386
1387 /*
1388  * amdgpu_acpi_detect - detect ACPI ATIF/ATCS methods
1389  *
1390  * Check if we have the ATIF/ATCS methods and populate
1391  * the structures in the driver.
1392  */
1393 void amdgpu_acpi_detect(void)
1394 {
1395         struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
1396         struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
1397         struct pci_dev *pdev = NULL;
1398         int ret;
1399
1400         while ((pdev = pci_get_base_class(PCI_BASE_CLASS_DISPLAY, pdev))) {
1401                 if ((pdev->class != PCI_CLASS_DISPLAY_VGA << 8) &&
1402                     (pdev->class != PCI_CLASS_DISPLAY_OTHER << 8))
1403                         continue;
1404
1405                 if (!atif->handle)
1406                         amdgpu_atif_pci_probe_handle(pdev);
1407                 if (!atcs->handle)
1408                         amdgpu_atcs_pci_probe_handle(pdev);
1409         }
1410
1411         if (atif->functions.sbios_requests && !atif->functions.system_params) {
1412                 /* XXX check this workraround, if sbios request function is
1413                  * present we have to see how it's configured in the system
1414                  * params
1415                  */
1416                 atif->functions.system_params = true;
1417         }
1418
1419         if (atif->functions.system_params) {
1420                 ret = amdgpu_atif_get_notification_params(atif);
1421                 if (ret) {
1422                         DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
1423                                         ret);
1424                         /* Disable notification */
1425                         atif->notification_cfg.enabled = false;
1426                 }
1427         }
1428
1429         if (atif->functions.query_backlight_transfer_characteristics) {
1430                 ret = amdgpu_atif_query_backlight_caps(atif);
1431                 if (ret) {
1432                         DRM_DEBUG_DRIVER("Call to QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS failed: %d\n",
1433                                         ret);
1434                         atif->backlight_caps.caps_valid = false;
1435                 }
1436         } else {
1437                 atif->backlight_caps.caps_valid = false;
1438         }
1439
1440         amdgpu_acpi_enumerate_xcc();
1441 }
1442
1443 void amdgpu_acpi_release(void)
1444 {
1445         struct amdgpu_acpi_dev_info *dev_info, *dev_tmp;
1446         struct amdgpu_acpi_xcc_info *xcc_info, *xcc_tmp;
1447         struct amdgpu_numa_info *numa_info;
1448         unsigned long index;
1449
1450         xa_for_each(&numa_info_xa, index, numa_info) {
1451                 kfree(numa_info);
1452                 xa_erase(&numa_info_xa, index);
1453         }
1454
1455         if (list_empty(&amdgpu_acpi_dev_list))
1456                 return;
1457
1458         list_for_each_entry_safe(dev_info, dev_tmp, &amdgpu_acpi_dev_list,
1459                                  list) {
1460                 list_for_each_entry_safe(xcc_info, xcc_tmp, &dev_info->xcc_list,
1461                                          list) {
1462                         list_del(&xcc_info->list);
1463                         kfree(xcc_info);
1464                 }
1465
1466                 list_del(&dev_info->list);
1467                 kfree(dev_info);
1468         }
1469 }
1470
1471 #if IS_ENABLED(CONFIG_SUSPEND)
1472 /**
1473  * amdgpu_acpi_is_s3_active
1474  *
1475  * @adev: amdgpu_device_pointer
1476  *
1477  * returns true if supported, false if not.
1478  */
1479 bool amdgpu_acpi_is_s3_active(struct amdgpu_device *adev)
1480 {
1481         return !(adev->flags & AMD_IS_APU) ||
1482                 (pm_suspend_target_state == PM_SUSPEND_MEM);
1483 }
1484
1485 /**
1486  * amdgpu_acpi_is_s0ix_active
1487  *
1488  * @adev: amdgpu_device_pointer
1489  *
1490  * returns true if supported, false if not.
1491  */
1492 bool amdgpu_acpi_is_s0ix_active(struct amdgpu_device *adev)
1493 {
1494         if (!(adev->flags & AMD_IS_APU) ||
1495             (pm_suspend_target_state != PM_SUSPEND_TO_IDLE))
1496                 return false;
1497
1498         if (adev->asic_type < CHIP_RAVEN)
1499                 return false;
1500
1501         if (!(adev->pm.pp_feature & PP_GFXOFF_MASK))
1502                 return false;
1503
1504         /*
1505          * If ACPI_FADT_LOW_POWER_S0 is not set in the FADT, it is generally
1506          * risky to do any special firmware-related preparations for entering
1507          * S0ix even though the system is suspending to idle, so return false
1508          * in that case.
1509          */
1510         if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)) {
1511                 dev_err_once(adev->dev,
1512                               "Power consumption will be higher as BIOS has not been configured for suspend-to-idle.\n"
1513                               "To use suspend-to-idle change the sleep mode in BIOS setup.\n");
1514                 return false;
1515         }
1516
1517 #if !IS_ENABLED(CONFIG_AMD_PMC)
1518         dev_err_once(adev->dev,
1519                       "Power consumption will be higher as the kernel has not been compiled with CONFIG_AMD_PMC.\n");
1520         return false;
1521 #else
1522         return true;
1523 #endif /* CONFIG_AMD_PMC */
1524 }
1525
1526 /**
1527  * amdgpu_choose_low_power_state
1528  *
1529  * @adev: amdgpu_device_pointer
1530  *
1531  * Choose the target low power state for the GPU
1532  */
1533 void amdgpu_choose_low_power_state(struct amdgpu_device *adev)
1534 {
1535         if (adev->in_runpm)
1536                 return;
1537
1538         if (amdgpu_acpi_is_s0ix_active(adev))
1539                 adev->in_s0ix = true;
1540         else if (amdgpu_acpi_is_s3_active(adev))
1541                 adev->in_s3 = true;
1542 }
1543
1544 #endif /* CONFIG_SUSPEND */