1 /* $NetBSD: nouveau_acpi.c,v 1.5 2024/04/16 14:34:02 riastradh Exp $ */ 2 3 // SPDX-License-Identifier: MIT 4 #include <sys/cdefs.h> 5 __KERNEL_RCSID(0, "$NetBSD: nouveau_acpi.c,v 1.5 2024/04/16 14:34:02 riastradh Exp $"); 6 7 #include <linux/pci.h> 8 #include <linux/acpi.h> 9 #include <linux/slab.h> 10 #include <linux/mxm-wmi.h> 11 #include <linux/vga_switcheroo.h> 12 #include <drm/drm_edid.h> 13 #include <acpi/video.h> 14 15 #include "nouveau_drv.h" 16 #include "nouveau_acpi.h" 17 18 #ifdef __NetBSD__ 19 #include <dev/acpi/acpireg.h> 20 #define _COMPONENT ACPI_DISPLAY_COMPONENT 21 ACPI_MODULE_NAME("nouveau_acpi") 22 #include <linux/nbsd-namespace-acpi.h> 23 #endif 24 25 #define NOUVEAU_DSM_LED 0x02 26 #define NOUVEAU_DSM_LED_STATE 0x00 27 #define NOUVEAU_DSM_LED_OFF 0x10 28 #define NOUVEAU_DSM_LED_STAMINA 0x11 29 #define NOUVEAU_DSM_LED_SPEED 0x12 30 31 #define NOUVEAU_DSM_POWER 0x03 32 #define NOUVEAU_DSM_POWER_STATE 0x00 33 #define NOUVEAU_DSM_POWER_SPEED 0x01 34 #define NOUVEAU_DSM_POWER_STAMINA 0x02 35 36 #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A 37 #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B 38 39 #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24) 40 #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24) 41 #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1) 42 43 #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED) 44 45 /* result of the optimus caps function */ 46 #define OPTIMUS_ENABLED (1 << 0) 47 #define OPTIMUS_STATUS_MASK (3 << 3) 48 #define OPTIMUS_STATUS_OFF (0 << 3) 49 #define OPTIMUS_STATUS_ON_ENABLED (1 << 3) 50 #define OPTIMUS_STATUS_PWR_STABLE (3 << 3) 51 #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6) 52 #define OPTIMUS_CAPS_MASK (7 << 24) 53 #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24) 54 55 #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27) 56 #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */ 57 58 static struct nouveau_dsm_priv { 59 bool dsm_detected; 60 bool optimus_detected; 61 bool optimus_flags_detected; 62 bool optimus_skip_dsm; 63 acpi_handle dhandle; 64 acpi_handle rom_handle; 65 } nouveau_dsm_priv; 66 67 bool nouveau_is_optimus(void) { 68 return nouveau_dsm_priv.optimus_detected; 69 } 70 71 bool nouveau_is_v1_dsm(void) { 72 return nouveau_dsm_priv.dsm_detected; 73 } 74 75 #ifdef CONFIG_VGA_SWITCHEROO 76 static const guid_t nouveau_dsm_muid = 77 GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48, 78 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4); 79 80 static const guid_t nouveau_op_dsm_muid = 81 GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B, 82 0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0); 83 84 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result) 85 { 86 int i; 87 union acpi_object *obj; 88 char args_buff[4]; 89 union acpi_object argv4 = { 90 .buffer.type = ACPI_TYPE_BUFFER, 91 .buffer.length = 4, 92 .buffer.pointer = args_buff 93 }; 94 95 /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */ 96 for (i = 0; i < 4; i++) 97 args_buff[i] = (arg >> i * 8) & 0xFF; 98 99 *result = 0; 100 obj = acpi_evaluate_dsm_typed(handle, &nouveau_op_dsm_muid, 0x00000100, 101 func, &argv4, ACPI_TYPE_BUFFER); 102 if (!obj) { 103 acpi_handle_info(handle, "failed to evaluate _DSM\n"); 104 return AE_ERROR; 105 } else { 106 if (obj->buffer.length == 4) { 107 *result |= obj->buffer.pointer[0]; 108 *result |= (obj->buffer.pointer[1] << 8); 109 *result |= (obj->buffer.pointer[2] << 16); 110 *result |= (obj->buffer.pointer[3] << 24); 111 } 112 ACPI_FREE(obj); 113 } 114 115 return 0; 116 } 117 118 /* 119 * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special 120 * requirements on the fourth parameter, so a private implementation 121 * instead of using acpi_check_dsm(). 122 */ 123 static int nouveau_dsm_get_optimus_functions(acpi_handle handle) 124 { 125 int result; 126 127 /* 128 * Function 0 returns a Buffer containing available functions. 129 * The args parameter is ignored for function 0, so just put 0 in it 130 */ 131 if (nouveau_optimus_dsm(handle, 0, 0, &result)) 132 return 0; 133 134 /* 135 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. 136 * If the n-th bit is enabled, function n is supported 137 */ 138 if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS)) 139 return result; 140 return 0; 141 } 142 143 static int nouveau_dsm(acpi_handle handle, int func, int arg) 144 { 145 int ret = 0; 146 union acpi_object *obj; 147 union acpi_object argv4 = { 148 .integer.type = ACPI_TYPE_INTEGER, 149 .integer.value = arg, 150 }; 151 152 obj = acpi_evaluate_dsm_typed(handle, &nouveau_dsm_muid, 0x00000102, 153 func, &argv4, ACPI_TYPE_INTEGER); 154 if (!obj) { 155 acpi_handle_info(handle, "failed to evaluate _DSM\n"); 156 return AE_ERROR; 157 } else { 158 if (obj->integer.value == 0x80000002) 159 ret = -ENODEV; 160 ACPI_FREE(obj); 161 } 162 163 return ret; 164 } 165 166 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id) 167 { 168 mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 169 mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0); 170 return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id); 171 } 172 173 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state) 174 { 175 int arg; 176 if (state == VGA_SWITCHEROO_ON) 177 arg = NOUVEAU_DSM_POWER_SPEED; 178 else 179 arg = NOUVEAU_DSM_POWER_STAMINA; 180 nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg); 181 return 0; 182 } 183 184 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id) 185 { 186 if (!nouveau_dsm_priv.dsm_detected) 187 return 0; 188 if (id == VGA_SWITCHEROO_IGD) 189 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA); 190 else 191 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED); 192 } 193 194 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id, 195 enum vga_switcheroo_state state) 196 { 197 if (id == VGA_SWITCHEROO_IGD) 198 return 0; 199 200 /* Optimus laptops have the card already disabled in 201 * nouveau_switcheroo_set_state */ 202 if (!nouveau_dsm_priv.dsm_detected) 203 return 0; 204 205 return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state); 206 } 207 208 static enum vga_switcheroo_client_id nouveau_dsm_get_client_id(struct pci_dev *pdev) 209 { 210 /* easy option one - intel vendor ID means Integrated */ 211 if (pdev->vendor == PCI_VENDOR_ID_INTEL) 212 return VGA_SWITCHEROO_IGD; 213 214 /* is this device on Bus 0? - this may need improving */ 215 if (pdev->bus->number == 0) 216 return VGA_SWITCHEROO_IGD; 217 218 return VGA_SWITCHEROO_DIS; 219 } 220 221 static const struct vga_switcheroo_handler nouveau_dsm_handler = { 222 .switchto = nouveau_dsm_switchto, 223 .power_state = nouveau_dsm_power_state, 224 .get_client_id = nouveau_dsm_get_client_id, 225 }; 226 227 /* 228 * Firmware supporting Windows 8 or later do not use _DSM to put the device into 229 * D3cold, they instead rely on disabling power resources on the parent. 230 */ 231 static bool nouveau_pr3_present(struct pci_dev *pdev) 232 { 233 struct pci_dev *parent_pdev = pci_upstream_bridge(pdev); 234 struct acpi_device *parent_adev; 235 236 if (!parent_pdev) 237 return false; 238 239 if (!parent_pdev->bridge_d3) { 240 /* 241 * Parent PCI bridge is currently not power managed. 242 * Since userspace can change these afterwards to be on 243 * the safe side we stick with _DSM and prevent usage of 244 * _PR3 from the bridge. 245 */ 246 pci_d3cold_disable(pdev); 247 return false; 248 } 249 250 parent_adev = ACPI_COMPANION(&parent_pdev->dev); 251 if (!parent_adev) 252 return false; 253 254 return parent_adev->power.flags.power_resources && 255 acpi_has_method(parent_adev->handle, "_PR3"); 256 } 257 258 static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out, 259 bool *has_mux, bool *has_opt, 260 bool *has_opt_flags, bool *has_pr3) 261 { 262 acpi_handle dhandle; 263 bool supports_mux; 264 int optimus_funcs; 265 266 #ifdef __NetBSD__ 267 dhandle = pdev->pd_ad->ad_handle; 268 #else 269 dhandle = ACPI_HANDLE(&pdev->dev); 270 #endif 271 if (!dhandle) 272 return; 273 274 if (!acpi_has_method(dhandle, "_DSM")) 275 return; 276 277 supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102, 278 1 << NOUVEAU_DSM_POWER); 279 optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle); 280 281 /* Does not look like a Nvidia device. */ 282 if (!supports_mux && !optimus_funcs) 283 return; 284 285 *dhandle_out = dhandle; 286 *has_mux = supports_mux; 287 *has_opt = !!optimus_funcs; 288 *has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS); 289 *has_pr3 = false; 290 291 if (optimus_funcs) { 292 uint32_t result; 293 nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0, 294 &result); 295 dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n", 296 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled", 297 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "", 298 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : ""); 299 300 *has_pr3 = nouveau_pr3_present(pdev); 301 } 302 } 303 304 static bool nouveau_dsm_detect(void) 305 { 306 char acpi_method_name[255] = { 0 }; 307 struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name}; 308 struct pci_dev *pdev = NULL; 309 acpi_handle dhandle = NULL; 310 bool has_mux = false; 311 bool has_optimus = false; 312 bool has_optimus_flags = false; 313 bool has_power_resources = false; 314 int vga_count = 0; 315 bool guid_valid; 316 bool ret = false; 317 318 /* lookup the MXM GUID */ 319 guid_valid = mxm_wmi_supported(); 320 321 if (guid_valid) 322 printk("MXM: GUID detected in BIOS\n"); 323 324 /* now do DSM detection */ 325 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) { 326 vga_count++; 327 328 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus, 329 &has_optimus_flags, &has_power_resources); 330 } 331 332 while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) { 333 vga_count++; 334 335 nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus, 336 &has_optimus_flags, &has_power_resources); 337 } 338 339 /* find the optimus DSM or the old v1 DSM */ 340 if (has_optimus) { 341 nouveau_dsm_priv.dhandle = dhandle; 342 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 343 &buffer); 344 pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n", 345 acpi_method_name); 346 if (has_power_resources) 347 pr_info("nouveau: detected PR support, will not use DSM\n"); 348 nouveau_dsm_priv.optimus_detected = true; 349 nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags; 350 nouveau_dsm_priv.optimus_skip_dsm = has_power_resources; 351 ret = true; 352 } else if (vga_count == 2 && has_mux && guid_valid) { 353 nouveau_dsm_priv.dhandle = dhandle; 354 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME, 355 &buffer); 356 pr_info("VGA switcheroo: detected DSM switching method %s handle\n", 357 acpi_method_name); 358 nouveau_dsm_priv.dsm_detected = true; 359 ret = true; 360 } 361 362 363 return ret; 364 } 365 366 void nouveau_register_dsm_handler(void) 367 { 368 bool r; 369 370 r = nouveau_dsm_detect(); 371 if (!r) 372 return; 373 374 vga_switcheroo_register_handler(&nouveau_dsm_handler, 0); 375 } 376 377 /* Must be called for Optimus models before the card can be turned off */ 378 void nouveau_switcheroo_optimus_dsm(void) 379 { 380 u32 result = 0; 381 if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm) 382 return; 383 384 if (nouveau_dsm_priv.optimus_flags_detected) 385 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS, 386 0x3, &result); 387 388 nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 389 NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result); 390 391 } 392 393 void nouveau_unregister_dsm_handler(void) 394 { 395 if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected) 396 vga_switcheroo_unregister_handler(); 397 } 398 #else 399 void nouveau_register_dsm_handler(void) {} 400 void nouveau_unregister_dsm_handler(void) {} 401 void nouveau_switcheroo_optimus_dsm(void) {} 402 #endif 403 404 /* retrieve the ROM in 4k blocks */ 405 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios, 406 int offset, int len) 407 { 408 acpi_status status; 409 union acpi_object rom_arg_elements[2], *obj; 410 struct acpi_object_list rom_arg; 411 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL}; 412 413 rom_arg.count = 2; 414 rom_arg.pointer = &rom_arg_elements[0]; 415 416 rom_arg_elements[0].type = ACPI_TYPE_INTEGER; 417 rom_arg_elements[0].integer.value = offset; 418 419 rom_arg_elements[1].type = ACPI_TYPE_INTEGER; 420 rom_arg_elements[1].integer.value = len; 421 422 status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer); 423 if (ACPI_FAILURE(status)) { 424 pr_info("failed to evaluate ROM got %s\n", 425 acpi_format_exception(status)); 426 return -ENODEV; 427 } 428 obj = (union acpi_object *)buffer.pointer; 429 len = min(len, (int)obj->buffer.length); 430 memcpy(bios+offset, obj->buffer.pointer, len); 431 ACPI_FREE(buffer.pointer); 432 return len; 433 } 434 435 #ifdef __NetBSD__ 436 bool nouveau_acpi_rom_supported(struct acpi_devnode *acpidev) 437 #else 438 bool nouveau_acpi_rom_supported(struct device *dev) 439 #endif 440 { 441 acpi_status status; 442 acpi_handle dhandle, rom_handle; 443 444 #ifdef __NetBSD__ 445 dhandle = (acpidev ? acpidev->ad_handle : NULL); 446 #else 447 dhandle = ACPI_HANDLE(dev); 448 #endif 449 if (!dhandle) 450 return false; 451 452 status = acpi_get_handle(dhandle, "_ROM", &rom_handle); 453 if (ACPI_FAILURE(status)) 454 return false; 455 456 nouveau_dsm_priv.rom_handle = rom_handle; 457 return true; 458 } 459 460 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len) 461 { 462 return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len); 463 } 464 465 void * 466 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) 467 { 468 #ifdef __NetBSD__ /* XXX nouveau acpi video */ 469 return NULL; 470 #else 471 struct acpi_device *acpidev; 472 acpi_handle handle; 473 int type, ret; 474 void *edid; 475 476 switch (connector->connector_type) { 477 case DRM_MODE_CONNECTOR_LVDS: 478 case DRM_MODE_CONNECTOR_eDP: 479 type = ACPI_VIDEO_DISPLAY_LCD; 480 break; 481 default: 482 return NULL; 483 } 484 485 #ifdef __NetBSD__ 486 handle = (dev->pdev->pd_ad ? dev->pdev->pd_ad->ad_handle : NULL); 487 #else 488 handle = ACPI_HANDLE(&dev->pdev->dev); 489 #endif 490 if (!handle) 491 return NULL; 492 493 ret = acpi_bus_get_device(handle, &acpidev); 494 if (ret) 495 return NULL; 496 497 ret = acpi_video_get_edid(acpidev, type, -1, &edid); 498 if (ret < 0) 499 return NULL; 500 501 return kmemdup(edid, EDID_LENGTH, GFP_KERNEL); 502 #endif 503 } 504
Indexes created Sat Oct 18 23:09:54 GMT 2025