// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (c) 2010 Red Hat Inc. * Author : Dave Airlie <airlied@redhat.com> * * ATPX support for both Intel/ATI */#include <linux/vga_switcheroo.h>#include <linux/slab.h>#include <linux/acpi.h>#include <linux/pci.h>#include <linux/delay.h> #include "amdgpu.h"#include "amd_acpi.h" #define AMDGPU_PX_QUIRK_FORCE_ATPX  (1 << 0) struct amdgpu_px_quirk {	u32 chip_vendor;	u32 chip_device;	u32 subsys_vendor;	u32 subsys_device;	u32 px_quirk_flags;}; struct amdgpu_atpx_functions {	bool px_params;	bool power_cntl;	bool disp_mux_cntl;	bool i2c_mux_cntl;	bool switch_start;	bool switch_end;	bool disp_connectors_mapping;	bool disp_detection_ports;}; struct amdgpu_atpx {	acpi_handle handle;	struct amdgpu_atpx_functions functions;	bool is_hybrid;	bool dgpu_req_power_for_displays;}; static struct amdgpu_atpx_priv {	bool atpx_detected;	bool bridge_pm_usable;	unsigned int quirks;	/* handle for device - and atpx */	acpi_handle dhandle;	acpi_handle other_handle;	struct amdgpu_atpx atpx;} amdgpu_atpx_priv; struct atpx_verify_interface {	u16 size;		/* structure size in bytes (includes size field) */	u16 version;		/* version */	u32 function_bits;	/* supported functions bit vector */} __packed; struct atpx_px_params {	u16 size;		/* structure size in bytes (includes size field) */	u32 valid_flags;	/* which flags are valid */	u32 flags;		/* flags */} __packed; struct atpx_power_control {	u16 size;	u8 dgpu_state;} __packed; struct atpx_mux {	u16 size;	u16 mux;} __packed; bool amdgpu_has_atpx(void){	return amdgpu_atpx_priv.atpx_detected;} bool amdgpu_has_atpx_dgpu_power_cntl(void){	return amdgpu_atpx_priv.atpx.functions.power_cntl;} bool amdgpu_is_atpx_hybrid(void){	return amdgpu_atpx_priv.atpx.is_hybrid;} static bool amdgpu_atpx_buffer_validate(const union acpi_object *obj,					size_t min_size){	return obj && obj->type == ACPI_TYPE_BUFFER &&	       obj->buffer.length >= sizeof(u16) &&	       obj->buffer.length >= *(u16 *)obj->buffer.pointer &&	       *(u16 *)obj->buffer.pointer >= min_size;} /** * amdgpu_atpx_call - call an ATPX method * * @handle: acpi handle * @function: the ATPX function to execute * @params: ATPX function params * * Executes the requested ATPX function (all asics). * Returns a pointer to the acpi output buffer. */static union acpi_object *amdgpu_atpx_call(acpi_handle handle, int function,					   struct acpi_buffer *params){	acpi_status status;	union acpi_object atpx_arg_elements[2];	struct acpi_object_list atpx_arg;	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 	atpx_arg.count = 2;	atpx_arg.pointer = &atpx_arg_elements[0]; 	atpx_arg_elements[0].type = ACPI_TYPE_INTEGER;	atpx_arg_elements[0].integer.value = function; 	if (params) {		atpx_arg_elements[1].type = ACPI_TYPE_BUFFER;		atpx_arg_elements[1].buffer.length = params->length;		atpx_arg_elements[1].buffer.pointer = params->pointer;	} else {		/* We need a second fake parameter */		atpx_arg_elements[1].type = ACPI_TYPE_INTEGER;		atpx_arg_elements[1].integer.value = 0;	} 	status = acpi_evaluate_object(handle, NULL, &atpx_arg, &buffer); 	/* Fail only if calling the method fails and ATPX is supported */	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {		pr_err("failed to evaluate ATPX got %s\n",		       acpi_format_exception(status));		kfree(buffer.pointer);		return NULL;	} 	return buffer.pointer;} /** * amdgpu_atpx_parse_functions - parse supported functions * * @f: supported functions struct * @mask: supported functions mask from ATPX * * Use the supported functions mask from ATPX function * ATPX_FUNCTION_VERIFY_INTERFACE to determine what functions * are supported (all asics). */static void amdgpu_atpx_parse_functions(struct amdgpu_atpx_functions *f, u32 mask){	f->px_params = mask & ATPX_GET_PX_PARAMETERS_SUPPORTED;	f->power_cntl = mask & ATPX_POWER_CONTROL_SUPPORTED;	f->disp_mux_cntl = mask & ATPX_DISPLAY_MUX_CONTROL_SUPPORTED;	f->i2c_mux_cntl = mask & ATPX_I2C_MUX_CONTROL_SUPPORTED;	f->switch_start = mask & ATPX_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION_SUPPORTED;	f->switch_end = mask & ATPX_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION_SUPPORTED;	f->disp_connectors_mapping = mask & ATPX_GET_DISPLAY_CONNECTORS_MAPPING_SUPPORTED;	f->disp_detection_ports = mask & ATPX_GET_DISPLAY_DETECTION_PORTS_SUPPORTED;} /** * amdgpu_atpx_validate - validate ATPX functions * * @atpx: amdgpu atpx struct * * Validate that required functions are enabled (all asics). * returns 0 on success, error on failure. */static int amdgpu_atpx_validate(struct amdgpu_atpx *atpx){	u32 valid_bits = 0; 	if (atpx->functions.px_params) {		union acpi_object *info;		struct atpx_px_params output;		size_t size; 		info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_GET_PX_PARAMETERS, NULL);		if (!info)			return -EIO; 		if (!amdgpu_atpx_buffer_validate(info, sizeof(output))) {			pr_err("Invalid ATPX GET_PX_PARAMETERS response\n");			kfree(info);			return -EINVAL;		} 		memset(&output, 0, sizeof(output)); 		size = min(sizeof(output), (size_t)*(u16 *)info->buffer.pointer); 		memcpy(&output, info->buffer.pointer, size); 		valid_bits = output.flags & output.valid_flags; 		kfree(info);	} 	/* if separate mux flag is set, mux controls are required */	if (valid_bits & ATPX_SEPARATE_MUX_FOR_I2C) {		atpx->functions.i2c_mux_cntl = true;		atpx->functions.disp_mux_cntl = true;	}	/* if any outputs are muxed, mux controls are required */	if (valid_bits & (ATPX_CRT1_RGB_SIGNAL_MUXED |			  ATPX_TV_SIGNAL_MUXED |			  ATPX_DFP_SIGNAL_MUXED))		atpx->functions.disp_mux_cntl = true;  	/* some bioses set these bits rather than flagging power_cntl as supported */	if (valid_bits & (ATPX_DYNAMIC_PX_SUPPORTED |			  ATPX_DYNAMIC_DGPU_POWER_OFF_SUPPORTED))		atpx->functions.power_cntl = true; 	atpx->is_hybrid = false;	if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) {		if (amdgpu_atpx_priv.quirks & AMDGPU_PX_QUIRK_FORCE_ATPX) {			pr_warn("ATPX Hybrid Graphics, forcing to ATPX\n");			atpx->functions.power_cntl = true;			atpx->is_hybrid = false;		} else {			pr_notice("ATPX Hybrid Graphics\n");			/*			 * Disable legacy PM methods only when pcie port PM is usable,			 * otherwise the device might fail to power off or power on.			 */			atpx->functions.power_cntl = !amdgpu_atpx_priv.bridge_pm_usable;			atpx->is_hybrid = true;		}	} 	atpx->dgpu_req_power_for_displays = false;	if (valid_bits & ATPX_DGPU_REQ_POWER_FOR_DISPLAYS)		atpx->dgpu_req_power_for_displays = true; 	return 0;} /** * amdgpu_atpx_verify_interface - verify ATPX * * @atpx: amdgpu atpx struct * * Execute the ATPX_FUNCTION_VERIFY_INTERFACE ATPX function * to initialize ATPX and determine what features are supported * (all asics). * returns 0 on success, error on failure. */static int amdgpu_atpx_verify_interface(struct amdgpu_atpx *atpx){	union acpi_object *info;	struct atpx_verify_interface output;	size_t size;	int err = 0; 	info = amdgpu_atpx_call(atpx->handle, ATPX_FUNCTION_VERIFY_INTERFACE, NULL);	if (!info)		return -EIO; 	if (!amdgpu_atpx_buffer_validate(info, sizeof(output))) {		pr_err("Invalid ATPX VERIFY_INTERFACE response\n");		err = -EINVAL;		goto out;	} 	memset(&output, 0, sizeof(output)); 	size = min(sizeof(output), (size_t)*(u16 *)info->buffer.pointer); 	memcpy(&output, info->buffer.pointer, size); 	/* TODO: check version? */	pr_notice("ATPX version %u, functions 0x%08x\n",		  output.version, output.function_bits); 	amdgpu_atpx_parse_functions(&atpx->functions, output.function_bits); out:	kfree(info);	return err;} /** * amdgpu_atpx_set_discrete_state - power up/down discrete GPU * * @atpx: atpx info struct * @state: discrete GPU state (0 = power down, 1 = power up) * * Execute the ATPX_FUNCTION_POWER_CONTROL ATPX function to * power down/up the discrete GPU (all asics). * Returns 0 on success, error on failure. */static int amdgpu_atpx_set_discrete_state(struct amdgpu_atpx *atpx, u8 state){	struct acpi_buffer params;	union acpi_object *info;	struct atpx_power_control input; 	if (atpx->functions.power_cntl) {		input.size = 3;		input.dgpu_state = state;		params.length = input.size;		params.pointer = &input;		info = amdgpu_atpx_call(atpx->handle,					ATPX_FUNCTION_POWER_CONTROL,					&params);		if (!info)			return -EIO;		kfree(info); 		/* 200ms delay is required after off */		if (state == 0)			msleep(200);	}	return 0;} /** * amdgpu_atpx_switch_disp_mux - switch display mux * * @atpx: atpx info struct * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) * * Execute the ATPX_FUNCTION_DISPLAY_MUX_CONTROL ATPX function to * switch the display mux between the discrete GPU and integrated GPU * (all asics). * Returns 0 on success, error on failure. */static int amdgpu_atpx_switch_disp_mux(struct amdgpu_atpx *atpx, u16 mux_id){	struct acpi_buffer params;	union acpi_object *info;	struct atpx_mux input; 	if (atpx->functions.disp_mux_cntl) {		input.size = 4;		input.mux = mux_id;		params.length = input.size;		params.pointer = &input;		info = amdgpu_atpx_call(atpx->handle,					ATPX_FUNCTION_DISPLAY_MUX_CONTROL,					&params);		if (!info)			return -EIO;		kfree(info);	}	return 0;} /** * amdgpu_atpx_switch_i2c_mux - switch i2c/hpd mux * * @atpx: atpx info struct * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) * * Execute the ATPX_FUNCTION_I2C_MUX_CONTROL ATPX function to * switch the i2c/hpd mux between the discrete GPU and integrated GPU * (all asics). * Returns 0 on success, error on failure. */static int amdgpu_atpx_switch_i2c_mux(struct amdgpu_atpx *atpx, u16 mux_id){	struct acpi_buffer params;	union acpi_object *info;	struct atpx_mux input; 	if (atpx->functions.i2c_mux_cntl) {		input.size = 4;		input.mux = mux_id;		params.length = input.size;		params.pointer = &input;		info = amdgpu_atpx_call(atpx->handle,					ATPX_FUNCTION_I2C_MUX_CONTROL,					&params);		if (!info)			return -EIO;		kfree(info);	}	return 0;} /** * amdgpu_atpx_switch_start - notify the sbios of a GPU switch * * @atpx: atpx info struct * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) * * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION ATPX * function to notify the sbios that a switch between the discrete GPU and * integrated GPU has begun (all asics). * Returns 0 on success, error on failure. */static int amdgpu_atpx_switch_start(struct amdgpu_atpx *atpx, u16 mux_id){	struct acpi_buffer params;	union acpi_object *info;	struct atpx_mux input; 	if (atpx->functions.switch_start) {		input.size = 4;		input.mux = mux_id;		params.length = input.size;		params.pointer = &input;		info = amdgpu_atpx_call(atpx->handle,					ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_START_NOTIFICATION,					&params);		if (!info)			return -EIO;		kfree(info);	}	return 0;} /** * amdgpu_atpx_switch_end - notify the sbios of a GPU switch * * @atpx: atpx info struct * @mux_id: mux state (0 = integrated GPU, 1 = discrete GPU) * * Execute the ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION ATPX * function to notify the sbios that a switch between the discrete GPU and * integrated GPU has ended (all asics). * Returns 0 on success, error on failure. */static int amdgpu_atpx_switch_end(struct amdgpu_atpx *atpx, u16 mux_id){	struct acpi_buffer params;	union acpi_object *info;	struct atpx_mux input; 	if (atpx->functions.switch_end) {		input.size = 4;		input.mux = mux_id;		params.length = input.size;		params.pointer = &input;		info = amdgpu_atpx_call(atpx->handle,					ATPX_FUNCTION_GRAPHICS_DEVICE_SWITCH_END_NOTIFICATION,					&params);		if (!info)			return -EIO;		kfree(info);	}	return 0;} /** * amdgpu_atpx_switchto - switch to the requested GPU * * @id: GPU to switch to * * Execute the necessary ATPX functions to switch between the discrete GPU and * integrated GPU (all asics). * Returns 0 on success, error on failure. */static int amdgpu_atpx_switchto(enum vga_switcheroo_client_id id){	u16 gpu_id; 	if (id == VGA_SWITCHEROO_IGD)		gpu_id = ATPX_INTEGRATED_GPU;	else		gpu_id = ATPX_DISCRETE_GPU; 	amdgpu_atpx_switch_start(&amdgpu_atpx_priv.atpx, gpu_id);	amdgpu_atpx_switch_disp_mux(&amdgpu_atpx_priv.atpx, gpu_id);	amdgpu_atpx_switch_i2c_mux(&amdgpu_atpx_priv.atpx, gpu_id);	amdgpu_atpx_switch_end(&amdgpu_atpx_priv.atpx, gpu_id); 	return 0;} /** * amdgpu_atpx_power_state - power down/up the requested GPU * * @id: GPU to power down/up * @state: requested power state (0 = off, 1 = on) * * Execute the necessary ATPX function to power down/up the discrete GPU * (all asics). * Returns 0 on success, error on failure. */static int amdgpu_atpx_power_state(enum vga_switcheroo_client_id id,				   enum vga_switcheroo_state state){	/* on w500 ACPI can't change intel gpu state */	if (id == VGA_SWITCHEROO_IGD)		return 0; 	amdgpu_atpx_set_discrete_state(&amdgpu_atpx_priv.atpx, state);	return 0;

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