1 // SPDX-License-Identifier: GPL-2.0 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 } 472