root/drivers/gpu/drm/nouveau/nouveau_acpi.c

DEFINITIONS

1. nouveau_is_optimus
2. nouveau_is_v1_dsm
3. nouveau_optimus_dsm
4. nouveau_dsm_get_optimus_functions
5. nouveau_dsm
6. nouveau_dsm_switch_mux
7. nouveau_dsm_set_discrete_state
8. nouveau_dsm_switchto
9. nouveau_dsm_power_state
10. nouveau_dsm_get_client_id
11. nouveau_pr3_present
12. nouveau_dsm_pci_probe
13. nouveau_dsm_detect
14. nouveau_register_dsm_handler
15. nouveau_switcheroo_optimus_dsm
16. nouveau_unregister_dsm_handler
17. nouveau_register_dsm_handler
18. nouveau_unregister_dsm_handler
19. nouveau_switcheroo_optimus_dsm
20. nouveau_rom_call
21. nouveau_acpi_rom_supported
22. nouveau_acpi_get_bios_chunk
23. nouveau_acpi_edid

   1 // SPDX-License-Identifier: MIT
   2 #include <linux/pci.h>
   3 #include <linux/acpi.h>
   4 #include <linux/slab.h>
   5 #include <linux/mxm-wmi.h>
   6 #include <linux/vga_switcheroo.h>
   7 #include <drm/drm_edid.h>
   8 #include <acpi/video.h>
   9 
  10 #include "nouveau_drv.h"
  11 #include "nouveau_acpi.h"
  12 
  13 #define NOUVEAU_DSM_LED 0x02
  14 #define NOUVEAU_DSM_LED_STATE 0x00
  15 #define NOUVEAU_DSM_LED_OFF 0x10
  16 #define NOUVEAU_DSM_LED_STAMINA 0x11
  17 #define NOUVEAU_DSM_LED_SPEED 0x12
  18 
  19 #define NOUVEAU_DSM_POWER 0x03
  20 #define NOUVEAU_DSM_POWER_STATE 0x00
  21 #define NOUVEAU_DSM_POWER_SPEED 0x01
  22 #define NOUVEAU_DSM_POWER_STAMINA 0x02
  23 
  24 #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
  25 #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
  26 
  27 #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
  28 #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
  29 #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
  30 
  31 #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
  32 
  33 /* result of the optimus caps function */
  34 #define OPTIMUS_ENABLED (1 << 0)
  35 #define OPTIMUS_STATUS_MASK (3 << 3)
  36 #define OPTIMUS_STATUS_OFF  (0 << 3)
  37 #define OPTIMUS_STATUS_ON_ENABLED  (1 << 3)
  38 #define OPTIMUS_STATUS_PWR_STABLE  (3 << 3)
  39 #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
  40 #define OPTIMUS_CAPS_MASK (7 << 24)
  41 #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
  42 
  43 #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
  44 #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
  45 
  46 static struct nouveau_dsm_priv {
  47         bool dsm_detected;
  48         bool optimus_detected;
  49         bool optimus_flags_detected;
  50         bool optimus_skip_dsm;
  51         acpi_handle dhandle;
  52         acpi_handle rom_handle;
  53 } nouveau_dsm_priv;
  54 
  55 bool nouveau_is_optimus(void) {
  56         return nouveau_dsm_priv.optimus_detected;
  57 }
  58 
  59 bool nouveau_is_v1_dsm(void) {
  60         return nouveau_dsm_priv.dsm_detected;
  61 }
  62 
  63 #ifdef CONFIG_VGA_SWITCHEROO
  64 static const guid_t nouveau_dsm_muid =
  65         GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48,
  66                   0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4);
  67 
  68 static const guid_t nouveau_op_dsm_muid =
  69         GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B,
  70                   0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0);
  71 
  72 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  73 {
  74         int i;
  75         union acpi_object *obj;
  76         char args_buff[4];
  77         union acpi_object argv4 = {
  78                 .buffer.type = ACPI_TYPE_BUFFER,
  79                 .buffer.length = 4,
  80                 .buffer.pointer = args_buff
  81         };
  82 
  83         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
  84         for (i = 0; i < 4; i++)
  85                 args_buff[i] = (arg >> i * 8) & 0xFF;
  86 
  87         *result = 0;
  88         obj = acpi_evaluate_dsm_typed(handle, &nouveau_op_dsm_muid, 0x00000100,
  89                                       func, &argv4, ACPI_TYPE_BUFFER);
  90         if (!obj) {
  91                 acpi_handle_info(handle, "failed to evaluate _DSM\n");
  92                 return AE_ERROR;
  93         } else {
  94                 if (obj->buffer.length == 4) {
  95                         *result |= obj->buffer.pointer[0];
  96                         *result |= (obj->buffer.pointer[1] << 8);
  97                         *result |= (obj->buffer.pointer[2] << 16);
  98                         *result |= (obj->buffer.pointer[3] << 24);
  99                 }
 100                 ACPI_FREE(obj);
 101         }
 102 
 103         return 0;
 104 }
 105 
 106 /*
 107  * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
 108  * requirements on the fourth parameter, so a private implementation
 109  * instead of using acpi_check_dsm().
 110  */
 111 static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
 112 {
 113         int result;
 114 
 115         /*
 116          * Function 0 returns a Buffer containing available functions.
 117          * The args parameter is ignored for function 0, so just put 0 in it
 118          */
 119         if (nouveau_optimus_dsm(handle, 0, 0, &result))
 120                 return 0;
 121 
 122         /*
 123          * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
 124          * If the n-th bit is enabled, function n is supported
 125          */
 126         if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
 127                 return result;
 128         return 0;
 129 }
 130 
 131 static int nouveau_dsm(acpi_handle handle, int func, int arg)
 132 {
 133         int ret = 0;
 134         union acpi_object *obj;
 135         union acpi_object argv4 = {
 136                 .integer.type = ACPI_TYPE_INTEGER,
 137                 .integer.value = arg,
 138         };
 139 
 140         obj = acpi_evaluate_dsm_typed(handle, &nouveau_dsm_muid, 0x00000102,
 141                                       func, &argv4, ACPI_TYPE_INTEGER);
 142         if (!obj) {
 143                 acpi_handle_info(handle, "failed to evaluate _DSM\n");
 144                 return AE_ERROR;
 145         } else {
 146                 if (obj->integer.value == 0x80000002)
 147                         ret = -ENODEV;
 148                 ACPI_FREE(obj);
 149         }
 150 
 151         return ret;
 152 }
 153 
 154 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 155 {
 156         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 157         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 158         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
 159 }
 160 
 161 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 162 {
 163         int arg;
 164         if (state == VGA_SWITCHEROO_ON)
 165                 arg = NOUVEAU_DSM_POWER_SPEED;
 166         else
 167                 arg = NOUVEAU_DSM_POWER_STAMINA;
 168         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
 169         return 0;
 170 }
 171 
 172 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 173 {
 174         if (!nouveau_dsm_priv.dsm_detected)
 175                 return 0;
 176         if (id == VGA_SWITCHEROO_IGD)
 177                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 178         else
 179                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 180 }
 181 
 182 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 183                                    enum vga_switcheroo_state state)
 184 {
 185         if (id == VGA_SWITCHEROO_IGD)
 186                 return 0;
 187 
 188         /* Optimus laptops have the card already disabled in
 189          * nouveau_switcheroo_set_state */
 190         if (!nouveau_dsm_priv.dsm_detected)
 191                 return 0;
 192 
 193         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 194 }
 195 
 196 static enum vga_switcheroo_client_id nouveau_dsm_get_client_id(struct pci_dev *pdev)
 197 {
 198         /* easy option one - intel vendor ID means Integrated */
 199         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 200                 return VGA_SWITCHEROO_IGD;
 201 
 202         /* is this device on Bus 0? - this may need improving */
 203         if (pdev->bus->number == 0)
 204                 return VGA_SWITCHEROO_IGD;
 205 
 206         return VGA_SWITCHEROO_DIS;
 207 }
 208 
 209 static const struct vga_switcheroo_handler nouveau_dsm_handler = {
 210         .switchto = nouveau_dsm_switchto,
 211         .power_state = nouveau_dsm_power_state,
 212         .get_client_id = nouveau_dsm_get_client_id,
 213 };
 214 
 215 /*
 216  * Firmware supporting Windows 8 or later do not use _DSM to put the device into
 217  * D3cold, they instead rely on disabling power resources on the parent.
 218  */
 219 static bool nouveau_pr3_present(struct pci_dev *pdev)
 220 {
 221         struct pci_dev *parent_pdev = pci_upstream_bridge(pdev);
 222         struct acpi_device *parent_adev;
 223 
 224         if (!parent_pdev)
 225                 return false;
 226 
 227         if (!parent_pdev->bridge_d3) {
 228                 /*
 229                  * Parent PCI bridge is currently not power managed.
 230                  * Since userspace can change these afterwards to be on
 231                  * the safe side we stick with _DSM and prevent usage of
 232                  * _PR3 from the bridge.
 233                  */
 234                 pci_d3cold_disable(pdev);
 235                 return false;
 236         }
 237 
 238         parent_adev = ACPI_COMPANION(&parent_pdev->dev);
 239         if (!parent_adev)
 240                 return false;
 241 
 242         return parent_adev->power.flags.power_resources &&
 243                 acpi_has_method(parent_adev->handle, "_PR3");
 244 }
 245 
 246 static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
 247                                   bool *has_mux, bool *has_opt,
 248                                   bool *has_opt_flags, bool *has_pr3)
 249 {
 250         acpi_handle dhandle;
 251         bool supports_mux;
 252         int optimus_funcs;
 253 
 254         dhandle = ACPI_HANDLE(&pdev->dev);
 255         if (!dhandle)
 256                 return;
 257 
 258         if (!acpi_has_method(dhandle, "_DSM"))
 259                 return;
 260 
 261         supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102,
 262                                       1 << NOUVEAU_DSM_POWER);
 263         optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
 264 
 265         /* Does not look like a Nvidia device. */
 266         if (!supports_mux && !optimus_funcs)
 267                 return;
 268 
 269         *dhandle_out = dhandle;
 270         *has_mux = supports_mux;
 271         *has_opt = !!optimus_funcs;
 272         *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
 273         *has_pr3 = false;
 274 
 275         if (optimus_funcs) {
 276                 uint32_t result;
 277                 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
 278                                     &result);
 279                 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
 280                          (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
 281                          (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
 282                          (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
 283 
 284                 *has_pr3 = nouveau_pr3_present(pdev);
 285         }
 286 }
 287 
 288 static bool nouveau_dsm_detect(void)
 289 {
 290         char acpi_method_name[255] = { 0 };
 291         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 292         struct pci_dev *pdev = NULL;
 293         acpi_handle dhandle = NULL;
 294         bool has_mux = false;
 295         bool has_optimus = false;
 296         bool has_optimus_flags = false;
 297         bool has_power_resources = false;
 298         int vga_count = 0;
 299         bool guid_valid;
 300         bool ret = false;
 301 
 302         /* lookup the MXM GUID */
 303         guid_valid = mxm_wmi_supported();
 304 
 305         if (guid_valid)
 306                 printk("MXM: GUID detected in BIOS\n");
 307 
 308         /* now do DSM detection */
 309         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 310                 vga_count++;
 311 
 312                 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
 313                                       &has_optimus_flags, &has_power_resources);
 314         }
 315 
 316         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
 317                 vga_count++;
 318 
 319                 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
 320                                       &has_optimus_flags, &has_power_resources);
 321         }
 322 
 323         /* find the optimus DSM or the old v1 DSM */
 324         if (has_optimus) {
 325                 nouveau_dsm_priv.dhandle = dhandle;
 326                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 327                         &buffer);
 328                 pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n",
 329                         acpi_method_name);
 330                 if (has_power_resources)
 331                         pr_info("nouveau: detected PR support, will not use DSM\n");
 332                 nouveau_dsm_priv.optimus_detected = true;
 333                 nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
 334                 nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
 335                 ret = true;
 336         } else if (vga_count == 2 && has_mux && guid_valid) {
 337                 nouveau_dsm_priv.dhandle = dhandle;
 338                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 339                         &buffer);
 340                 pr_info("VGA switcheroo: detected DSM switching method %s handle\n",
 341                         acpi_method_name);
 342                 nouveau_dsm_priv.dsm_detected = true;
 343                 ret = true;
 344         }
 345 
 346 
 347         return ret;
 348 }
 349 
 350 void nouveau_register_dsm_handler(void)
 351 {
 352         bool r;
 353 
 354         r = nouveau_dsm_detect();
 355         if (!r)
 356                 return;
 357 
 358         vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
 359 }
 360 
 361 /* Must be called for Optimus models before the card can be turned off */
 362 void nouveau_switcheroo_optimus_dsm(void)
 363 {
 364         u32 result = 0;
 365         if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
 366                 return;
 367 
 368         if (nouveau_dsm_priv.optimus_flags_detected)
 369                 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
 370                                     0x3, &result);
 371 
 372         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
 373                 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
 374 
 375 }
 376 
 377 void nouveau_unregister_dsm_handler(void)
 378 {
 379         if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
 380                 vga_switcheroo_unregister_handler();
 381 }
 382 #else
 383 void nouveau_register_dsm_handler(void) {}
 384 void nouveau_unregister_dsm_handler(void) {}
 385 void nouveau_switcheroo_optimus_dsm(void) {}
 386 #endif
 387 
 388 /* retrieve the ROM in 4k blocks */
 389 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 390                             int offset, int len)
 391 {
 392         acpi_status status;
 393         union acpi_object rom_arg_elements[2], *obj;
 394         struct acpi_object_list rom_arg;
 395         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 396 
 397         rom_arg.count = 2;
 398         rom_arg.pointer = &rom_arg_elements[0];
 399 
 400         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 401         rom_arg_elements[0].integer.value = offset;
 402 
 403         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 404         rom_arg_elements[1].integer.value = len;
 405 
 406         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 407         if (ACPI_FAILURE(status)) {
 408                 pr_info("failed to evaluate ROM got %s\n",
 409                         acpi_format_exception(status));
 410                 return -ENODEV;
 411         }
 412         obj = (union acpi_object *)buffer.pointer;
 413         len = min(len, (int)obj->buffer.length);
 414         memcpy(bios+offset, obj->buffer.pointer, len);
 415         kfree(buffer.pointer);
 416         return len;
 417 }
 418 
 419 bool nouveau_acpi_rom_supported(struct device *dev)
 420 {
 421         acpi_status status;
 422         acpi_handle dhandle, rom_handle;
 423 
 424         dhandle = ACPI_HANDLE(dev);
 425         if (!dhandle)
 426                 return false;
 427 
 428         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 429         if (ACPI_FAILURE(status))
 430                 return false;
 431 
 432         nouveau_dsm_priv.rom_handle = rom_handle;
 433         return true;
 434 }
 435 
 436 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 437 {
 438         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 439 }
 440 
 441 void *
 442 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 443 {
 444         struct acpi_device *acpidev;
 445         acpi_handle handle;
 446         int type, ret;
 447         void *edid;
 448 
 449         switch (connector->connector_type) {
 450         case DRM_MODE_CONNECTOR_LVDS:
 451         case DRM_MODE_CONNECTOR_eDP:
 452                 type = ACPI_VIDEO_DISPLAY_LCD;
 453                 break;
 454         default:
 455                 return NULL;
 456         }
 457 
 458         handle = ACPI_HANDLE(&dev->pdev->dev);
 459         if (!handle)
 460                 return NULL;
 461 
 462         ret = acpi_bus_get_device(handle, &acpidev);
 463         if (ret)
 464                 return NULL;
 465 
 466         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 467         if (ret < 0)
 468                 return NULL;
 469 
 470         return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 471 }