Home | History | Annotate | Line # | Download | only in nouveau
nouveau_acpi.c revision 1.1.1.3 
      1 /*	$NetBSD: nouveau_acpi.c,v 1.1.1.3 2021/12/18 20:15:35 riastradh Exp $	*/
      2 
      3 // SPDX-License-Identifier: MIT
      4 #include <sys/cdefs.h>
      5 __KERNEL_RCSID(0, "$NetBSD: nouveau_acpi.c,v 1.1.1.3 2021/12/18 20:15:35 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 #define NOUVEAU_DSM_LED 0x02
     19 #define NOUVEAU_DSM_LED_STATE 0x00
     20 #define NOUVEAU_DSM_LED_OFF 0x10
     21 #define NOUVEAU_DSM_LED_STAMINA 0x11
     22 #define NOUVEAU_DSM_LED_SPEED 0x12
     23 
     24 #define NOUVEAU_DSM_POWER 0x03
     25 #define NOUVEAU_DSM_POWER_STATE 0x00
     26 #define NOUVEAU_DSM_POWER_SPEED 0x01
     27 #define NOUVEAU_DSM_POWER_STAMINA 0x02
     28 
     29 #define NOUVEAU_DSM_OPTIMUS_CAPS 0x1A
     30 #define NOUVEAU_DSM_OPTIMUS_FLAGS 0x1B
     31 
     32 #define NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 (3 << 24)
     33 #define NOUVEAU_DSM_OPTIMUS_NO_POWERDOWN_PS3 (2 << 24)
     34 #define NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED (1)
     35 
     36 #define NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN (NOUVEAU_DSM_OPTIMUS_POWERDOWN_PS3 | NOUVEAU_DSM_OPTIMUS_FLAGS_CHANGED)
     37 
     38 /* result of the optimus caps function */
     39 #define OPTIMUS_ENABLED (1 << 0)
     40 #define OPTIMUS_STATUS_MASK (3 << 3)
     41 #define OPTIMUS_STATUS_OFF  (0 << 3)
     42 #define OPTIMUS_STATUS_ON_ENABLED  (1 << 3)
     43 #define OPTIMUS_STATUS_PWR_STABLE  (3 << 3)
     44 #define OPTIMUS_DISPLAY_HOTPLUG (1 << 6)
     45 #define OPTIMUS_CAPS_MASK (7 << 24)
     46 #define OPTIMUS_DYNAMIC_PWR_CAP (1 << 24)
     47 
     48 #define OPTIMUS_AUDIO_CAPS_MASK (3 << 27)
     49 #define OPTIMUS_HDA_CODEC_MASK (2 << 27) /* hda bios control */
     50 
     51 static struct nouveau_dsm_priv {
     52 	bool dsm_detected;
     53 	bool optimus_detected;
     54 	bool optimus_flags_detected;
     55 	bool optimus_skip_dsm;
     56 	acpi_handle dhandle;
     57 	acpi_handle rom_handle;
     58 } nouveau_dsm_priv;
     59 
     60 bool nouveau_is_optimus(void) {
     61 	return nouveau_dsm_priv.optimus_detected;
     62 }
     63 
     64 bool nouveau_is_v1_dsm(void) {
     65 	return nouveau_dsm_priv.dsm_detected;
     66 }
     67 
     68 #ifdef CONFIG_VGA_SWITCHEROO
     69 static const guid_t nouveau_dsm_muid =
     70 	GUID_INIT(0x9D95A0A0, 0x0060, 0x4D48,
     71 		  0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4);
     72 
     73 static const guid_t nouveau_op_dsm_muid =
     74 	GUID_INIT(0xA486D8F8, 0x0BDA, 0x471B,
     75 		  0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0);
     76 
     77 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
     78 {
     79 	int i;
     80 	union acpi_object *obj;
     81 	char args_buff[4];
     82 	union acpi_object argv4 = {
     83 		.buffer.type = ACPI_TYPE_BUFFER,
     84 		.buffer.length = 4,
     85 		.buffer.pointer = args_buff
     86 	};
     87 
     88 	/* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
     89 	for (i = 0; i < 4; i++)
     90 		args_buff[i] = (arg >> i * 8) & 0xFF;
     91 
     92 	*result = 0;
     93 	obj = acpi_evaluate_dsm_typed(handle, &nouveau_op_dsm_muid, 0x00000100,
     94 				      func, &argv4, ACPI_TYPE_BUFFER);
     95 	if (!obj) {
     96 		acpi_handle_info(handle, "failed to evaluate _DSM\n");
     97 		return AE_ERROR;
     98 	} else {
     99 		if (obj->buffer.length == 4) {
    100 			*result |= obj->buffer.pointer[0];
    101 			*result |= (obj->buffer.pointer[1] << 8);
    102 			*result |= (obj->buffer.pointer[2] << 16);
    103 			*result |= (obj->buffer.pointer[3] << 24);
    104 		}
    105 		ACPI_FREE(obj);
    106 	}
    107 
    108 	return 0;
    109 }
    110 
    111 /*
    112  * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
    113  * requirements on the fourth parameter, so a private implementation
    114  * instead of using acpi_check_dsm().
    115  */
    116 static int nouveau_dsm_get_optimus_functions(acpi_handle handle)
    117 {
    118 	int result;
    119 
    120 	/*
    121 	 * Function 0 returns a Buffer containing available functions.
    122 	 * The args parameter is ignored for function 0, so just put 0 in it
    123 	 */
    124 	if (nouveau_optimus_dsm(handle, 0, 0, &result))
    125 		return 0;
    126 
    127 	/*
    128 	 * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
    129 	 * If the n-th bit is enabled, function n is supported
    130 	 */
    131 	if (result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS))
    132 		return result;
    133 	return 0;
    134 }
    135 
    136 static int nouveau_dsm(acpi_handle handle, int func, int arg)
    137 {
    138 	int ret = 0;
    139 	union acpi_object *obj;
    140 	union acpi_object argv4 = {
    141 		.integer.type = ACPI_TYPE_INTEGER,
    142 		.integer.value = arg,
    143 	};
    144 
    145 	obj = acpi_evaluate_dsm_typed(handle, &nouveau_dsm_muid, 0x00000102,
    146 				      func, &argv4, ACPI_TYPE_INTEGER);
    147 	if (!obj) {
    148 		acpi_handle_info(handle, "failed to evaluate _DSM\n");
    149 		return AE_ERROR;
    150 	} else {
    151 		if (obj->integer.value == 0x80000002)
    152 			ret = -ENODEV;
    153 		ACPI_FREE(obj);
    154 	}
    155 
    156 	return ret;
    157 }
    158 
    159 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
    160 {
    161 	mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
    162 	mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
    163 	return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id);
    164 }
    165 
    166 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
    167 {
    168 	int arg;
    169 	if (state == VGA_SWITCHEROO_ON)
    170 		arg = NOUVEAU_DSM_POWER_SPEED;
    171 	else
    172 		arg = NOUVEAU_DSM_POWER_STAMINA;
    173 	nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg);
    174 	return 0;
    175 }
    176 
    177 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
    178 {
    179 	if (!nouveau_dsm_priv.dsm_detected)
    180 		return 0;
    181 	if (id == VGA_SWITCHEROO_IGD)
    182 		return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
    183 	else
    184 		return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
    185 }
    186 
    187 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
    188 				   enum vga_switcheroo_state state)
    189 {
    190 	if (id == VGA_SWITCHEROO_IGD)
    191 		return 0;
    192 
    193 	/* Optimus laptops have the card already disabled in
    194 	 * nouveau_switcheroo_set_state */
    195 	if (!nouveau_dsm_priv.dsm_detected)
    196 		return 0;
    197 
    198 	return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
    199 }
    200 
    201 static enum vga_switcheroo_client_id nouveau_dsm_get_client_id(struct pci_dev *pdev)
    202 {
    203 	/* easy option one - intel vendor ID means Integrated */
    204 	if (pdev->vendor == PCI_VENDOR_ID_INTEL)
    205 		return VGA_SWITCHEROO_IGD;
    206 
    207 	/* is this device on Bus 0? - this may need improving */
    208 	if (pdev->bus->number == 0)
    209 		return VGA_SWITCHEROO_IGD;
    210 
    211 	return VGA_SWITCHEROO_DIS;
    212 }
    213 
    214 static const struct vga_switcheroo_handler nouveau_dsm_handler = {
    215 	.switchto = nouveau_dsm_switchto,
    216 	.power_state = nouveau_dsm_power_state,
    217 	.get_client_id = nouveau_dsm_get_client_id,
    218 };
    219 
    220 /*
    221  * Firmware supporting Windows 8 or later do not use _DSM to put the device into
    222  * D3cold, they instead rely on disabling power resources on the parent.
    223  */
    224 static bool nouveau_pr3_present(struct pci_dev *pdev)
    225 {
    226 	struct pci_dev *parent_pdev = pci_upstream_bridge(pdev);
    227 	struct acpi_device *parent_adev;
    228 
    229 	if (!parent_pdev)
    230 		return false;
    231 
    232 	if (!parent_pdev->bridge_d3) {
    233 		/*
    234 		 * Parent PCI bridge is currently not power managed.
    235 		 * Since userspace can change these afterwards to be on
    236 		 * the safe side we stick with _DSM and prevent usage of
    237 		 * _PR3 from the bridge.
    238 		 */
    239 		pci_d3cold_disable(pdev);
    240 		return false;
    241 	}
    242 
    243 	parent_adev = ACPI_COMPANION(&parent_pdev->dev);
    244 	if (!parent_adev)
    245 		return false;
    246 
    247 	return parent_adev->power.flags.power_resources &&
    248 		acpi_has_method(parent_adev->handle, "_PR3");
    249 }
    250 
    251 static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
    252 				  bool *has_mux, bool *has_opt,
    253 				  bool *has_opt_flags, bool *has_pr3)
    254 {
    255 	acpi_handle dhandle;
    256 	bool supports_mux;
    257 	int optimus_funcs;
    258 
    259 	dhandle = ACPI_HANDLE(&pdev->dev);
    260 	if (!dhandle)
    261 		return;
    262 
    263 	if (!acpi_has_method(dhandle, "_DSM"))
    264 		return;
    265 
    266 	supports_mux = acpi_check_dsm(dhandle, &nouveau_dsm_muid, 0x00000102,
    267 				      1 << NOUVEAU_DSM_POWER);
    268 	optimus_funcs = nouveau_dsm_get_optimus_functions(dhandle);
    269 
    270 	/* Does not look like a Nvidia device. */
    271 	if (!supports_mux && !optimus_funcs)
    272 		return;
    273 
    274 	*dhandle_out = dhandle;
    275 	*has_mux = supports_mux;
    276 	*has_opt = !!optimus_funcs;
    277 	*has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
    278 	*has_pr3 = false;
    279 
    280 	if (optimus_funcs) {
    281 		uint32_t result;
    282 		nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
    283 				    &result);
    284 		dev_info(&pdev->dev, "optimus capabilities: %s, status %s%s\n",
    285 			 (result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
    286 			 (result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
    287 			 (result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
    288 
    289 		*has_pr3 = nouveau_pr3_present(pdev);
    290 	}
    291 }
    292 
    293 static bool nouveau_dsm_detect(void)
    294 {
    295 	char acpi_method_name[255] = { 0 };
    296 	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
    297 	struct pci_dev *pdev = NULL;
    298 	acpi_handle dhandle = NULL;
    299 	bool has_mux = false;
    300 	bool has_optimus = false;
    301 	bool has_optimus_flags = false;
    302 	bool has_power_resources = false;
    303 	int vga_count = 0;
    304 	bool guid_valid;
    305 	bool ret = false;
    306 
    307 	/* lookup the MXM GUID */
    308 	guid_valid = mxm_wmi_supported();
    309 
    310 	if (guid_valid)
    311 		printk("MXM: GUID detected in BIOS\n");
    312 
    313 	/* now do DSM detection */
    314 	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
    315 		vga_count++;
    316 
    317 		nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
    318 				      &has_optimus_flags, &has_power_resources);
    319 	}
    320 
    321 	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
    322 		vga_count++;
    323 
    324 		nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
    325 				      &has_optimus_flags, &has_power_resources);
    326 	}
    327 
    328 	/* find the optimus DSM or the old v1 DSM */
    329 	if (has_optimus) {
    330 		nouveau_dsm_priv.dhandle = dhandle;
    331 		acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
    332 			&buffer);
    333 		pr_info("VGA switcheroo: detected Optimus DSM method %s handle\n",
    334 			acpi_method_name);
    335 		if (has_power_resources)
    336 			pr_info("nouveau: detected PR support, will not use DSM\n");
    337 		nouveau_dsm_priv.optimus_detected = true;
    338 		nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
    339 		nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
    340 		ret = true;
    341 	} else if (vga_count == 2 && has_mux && guid_valid) {
    342 		nouveau_dsm_priv.dhandle = dhandle;
    343 		acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
    344 			&buffer);
    345 		pr_info("VGA switcheroo: detected DSM switching method %s handle\n",
    346 			acpi_method_name);
    347 		nouveau_dsm_priv.dsm_detected = true;
    348 		ret = true;
    349 	}
    350 
    351 
    352 	return ret;
    353 }
    354 
    355 void nouveau_register_dsm_handler(void)
    356 {
    357 	bool r;
    358 
    359 	r = nouveau_dsm_detect();
    360 	if (!r)
    361 		return;
    362 
    363 	vga_switcheroo_register_handler(&nouveau_dsm_handler, 0);
    364 }
    365 
    366 /* Must be called for Optimus models before the card can be turned off */
    367 void nouveau_switcheroo_optimus_dsm(void)
    368 {
    369 	u32 result = 0;
    370 	if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
    371 		return;
    372 
    373 	if (nouveau_dsm_priv.optimus_flags_detected)
    374 		nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FLAGS,
    375 				    0x3, &result);
    376 
    377 	nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_CAPS,
    378 		NOUVEAU_DSM_OPTIMUS_SET_POWERDOWN, &result);
    379 
    380 }
    381 
    382 void nouveau_unregister_dsm_handler(void)
    383 {
    384 	if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
    385 		vga_switcheroo_unregister_handler();
    386 }
    387 #else
    388 void nouveau_register_dsm_handler(void) {}
    389 void nouveau_unregister_dsm_handler(void) {}
    390 void nouveau_switcheroo_optimus_dsm(void) {}
    391 #endif
    392 
    393 /* retrieve the ROM in 4k blocks */
    394 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
    395 			    int offset, int len)
    396 {
    397 	acpi_status status;
    398 	union acpi_object rom_arg_elements[2], *obj;
    399 	struct acpi_object_list rom_arg;
    400 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
    401 
    402 	rom_arg.count = 2;
    403 	rom_arg.pointer = &rom_arg_elements[0];
    404 
    405 	rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
    406 	rom_arg_elements[0].integer.value = offset;
    407 
    408 	rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
    409 	rom_arg_elements[1].integer.value = len;
    410 
    411 	status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
    412 	if (ACPI_FAILURE(status)) {
    413 		pr_info("failed to evaluate ROM got %s\n",
    414 			acpi_format_exception(status));
    415 		return -ENODEV;
    416 	}
    417 	obj = (union acpi_object *)buffer.pointer;
    418 	len = min(len, (int)obj->buffer.length);
    419 	memcpy(bios+offset, obj->buffer.pointer, len);
    420 	kfree(buffer.pointer);
    421 	return len;
    422 }
    423 
    424 bool nouveau_acpi_rom_supported(struct device *dev)
    425 {
    426 	acpi_status status;
    427 	acpi_handle dhandle, rom_handle;
    428 
    429 	dhandle = ACPI_HANDLE(dev);
    430 	if (!dhandle)
    431 		return false;
    432 
    433 	status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
    434 	if (ACPI_FAILURE(status))
    435 		return false;
    436 
    437 	nouveau_dsm_priv.rom_handle = rom_handle;
    438 	return true;
    439 }
    440 
    441 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
    442 {
    443 	return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
    444 }
    445 
    446 void *
    447 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
    448 {
    449 	struct acpi_device *acpidev;
    450 	acpi_handle handle;
    451 	int type, ret;
    452 	void *edid;
    453 
    454 	switch (connector->connector_type) {
    455 	case DRM_MODE_CONNECTOR_LVDS:
    456 	case DRM_MODE_CONNECTOR_eDP:
    457 		type = ACPI_VIDEO_DISPLAY_LCD;
    458 		break;
    459 	default:
    460 		return NULL;
    461 	}
    462 
    463 	handle = ACPI_HANDLE(&dev->pdev->dev);
    464 	if (!handle)
    465 		return NULL;
    466 
    467 	ret = acpi_bus_get_device(handle, &acpidev);
    468 	if (ret)
    469 		return NULL;
    470 
    471 	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
    472 	if (ret < 0)
    473 		return NULL;
    474 
    475 	return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
    476 }
    477