drivers/platform/x86/amd/pmf/acpi.c - linux/kernel/git/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * AMD Platform Management Framework Driver
  *
  * Copyright (c) 2022, Advanced Micro Devices, Inc.
  * All Rights Reserved.
  *
  * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
  */

 #include <linux/acpi.h>
 #include "pmf.h"

 #define APMF_CQL_NOTIFICATION  2
 #define APMF_AMT_NOTIFICATION  3

 static union acpi_object *apmf_if_call(struct amd_pmf_dev *pdev, int fn, struct acpi_buffer *param)
 {
 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 	acpi_handle ahandle = ACPI_HANDLE(pdev->dev);
 	struct acpi_object_list apmf_if_arg_list;
 	union acpi_object apmf_if_args[2];
 	acpi_status status;

 	apmf_if_arg_list.count = 2;
 	apmf_if_arg_list.pointer = &apmf_if_args[0];

 	apmf_if_args[0].type = ACPI_TYPE_INTEGER;
 	apmf_if_args[0].integer.value = fn;

 	if (param) {
 		apmf_if_args[1].type = ACPI_TYPE_BUFFER;
 		apmf_if_args[1].buffer.length = param->length;
 		apmf_if_args[1].buffer.pointer = param->pointer;
 	} else {
 		apmf_if_args[1].type = ACPI_TYPE_INTEGER;
 		apmf_if_args[1].integer.value = 0;
 	}

 	status = acpi_evaluate_object(ahandle, "APMF", &apmf_if_arg_list, &buffer);
 	if (ACPI_FAILURE(status)) {
 		dev_err(pdev->dev, "APMF method:%d call failed\n", fn);
 		kfree(buffer.pointer);
 		return NULL;
 	}

 	return buffer.pointer;
 }

 static int apmf_if_call_store_buffer(struct amd_pmf_dev *pdev, int fn, void *dest, size_t out_sz)
 {
 	union acpi_object *info;
 	size_t size;
 	int err = 0;

 	info = apmf_if_call(pdev, fn, NULL);
 	if (!info)
 		return -EIO;

 	if (info->type != ACPI_TYPE_BUFFER) {
 		dev_err(pdev->dev, "object is not a buffer\n");
 		err = -EINVAL;
 		goto out;
 	}

 	if (info->buffer.length < 2) {
 		dev_err(pdev->dev, "buffer too small\n");
 		err = -EINVAL;
 		goto out;
 	}

 	size = *(u16 *)info->buffer.pointer;
 	if (info->buffer.length < size) {
 		dev_err(pdev->dev, "buffer smaller then headersize %u < %zu\n",
 			info->buffer.length, size);
 		err = -EINVAL;
 		goto out;
 	}

 	if (size < out_sz) {
 		dev_err(pdev->dev, "buffer too small %zu\n", size);
 		err = -EINVAL;
 		goto out;
 	}

 	memcpy(dest, info->buffer.pointer, out_sz);

 out:
 	kfree(info);
 	return err;
 }

 static union acpi_object *apts_if_call(struct amd_pmf_dev *pdev, u32 state_index)
 {
 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 	acpi_handle ahandle = ACPI_HANDLE(pdev->dev);
 	struct acpi_object_list apts_if_arg_list;
 	union acpi_object apts_if_args[3];
 	acpi_status status;

 	apts_if_arg_list.count = 3;
 	apts_if_arg_list.pointer = &apts_if_args[0];

 	apts_if_args[0].type = ACPI_TYPE_INTEGER;
 	apts_if_args[0].integer.value = 1;
 	apts_if_args[1].type = ACPI_TYPE_INTEGER;
 	apts_if_args[1].integer.value = state_index;
 	apts_if_args[2].type = ACPI_TYPE_INTEGER;
 	apts_if_args[2].integer.value = 0;

 	status = acpi_evaluate_object(ahandle, "APTS", &apts_if_arg_list, &buffer);
 	if (ACPI_FAILURE(status)) {
 		dev_err(pdev->dev, "APTS state_idx:%u call failed\n", state_index);
 		kfree(buffer.pointer);
 		return NULL;
 	}

 	return buffer.pointer;
 }

 static int apts_if_call_store_buffer(struct amd_pmf_dev *pdev,
 				     u32 index, void *data, size_t out_sz)
 {
 	union acpi_object *info;
 	size_t size;
 	int err = 0;

 	info = apts_if_call(pdev, index);
 	if (!info)
 		return -EIO;

 	if (info->type != ACPI_TYPE_BUFFER) {
 		dev_err(pdev->dev, "object is not a buffer\n");
 		err = -EINVAL;
 		goto out;
 	}

 	size = *(u16 *)info->buffer.pointer;
 	if (info->buffer.length < size) {
 		dev_err(pdev->dev, "buffer smaller than header size %u < %zu\n",
 			info->buffer.length, size);
 		err = -EINVAL;
 		goto out;
 	}

 	if (size < out_sz) {
 		dev_err(pdev->dev, "buffer too small %zu\n", size);
 		err = -EINVAL;
 		goto out;
 	}

 	memcpy(data, info->buffer.pointer, out_sz);
 out:
 	kfree(info);
 	return err;
 }

 int is_apmf_func_supported(struct amd_pmf_dev *pdev, unsigned long index)
 {
 	/* If bit-n is set, that indicates function n+1 is supported */
 	return !!(pdev->supported_func & BIT(index - 1));
 }

 int apts_get_static_slider_granular_v2(struct amd_pmf_dev *pdev,
 				       struct amd_pmf_apts_granular_output *data, u32 apts_idx)
 {
 	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
 		return -EINVAL;

 	return apts_if_call_store_buffer(pdev, apts_idx, data, sizeof(*data));
 }

 int apmf_get_static_slider_granular_v2(struct amd_pmf_dev *pdev,
 				       struct apmf_static_slider_granular_output_v2 *data)
 {
 	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
 		return -EINVAL;

 	return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
 					 data, sizeof(*data));
 }

 int apmf_get_static_slider_granular(struct amd_pmf_dev *pdev,
 				    struct apmf_static_slider_granular_output *data)
 {
 	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
 		return -EINVAL;

 	return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
 									 data, sizeof(*data));
 }

 int apmf_os_power_slider_update(struct amd_pmf_dev *pdev, u8 event)
 {
 	struct os_power_slider args;
 	struct acpi_buffer params;
 	union acpi_object *info;

 	args.size = sizeof(args);
 	args.slider_event = event;

 	params.length = sizeof(args);
 	params.pointer = (void *)&args;

 	info = apmf_if_call(pdev, APMF_FUNC_OS_POWER_SLIDER_UPDATE, &params);
 	if (!info)
 		return -EIO;

 	kfree(info);
 	return 0;
 }

 static void apmf_sbios_heartbeat_notify(struct work_struct *work)
 {
 	struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, heart_beat.work);
 	union acpi_object *info;

 	dev_dbg(dev->dev, "Sending heartbeat to SBIOS\n");
 	info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT, NULL);
 	if (!info)
 		return;

 	schedule_delayed_work(&dev->heart_beat, msecs_to_jiffies(dev->hb_interval * 1000));
 	kfree(info);
 }

 int amd_pmf_notify_sbios_heartbeat_event_v2(struct amd_pmf_dev *dev, u8 flag)
 {
 	struct sbios_hb_event_v2 args = { };
 	struct acpi_buffer params;
 	union acpi_object *info;

 	args.size = sizeof(args);

 	switch (flag) {
 	case ON_LOAD:
 		args.load = 1;
 		break;
 	case ON_UNLOAD:
 		args.unload = 1;
 		break;
 	case ON_SUSPEND:
 		args.suspend = 1;
 		break;
 	case ON_RESUME:
 		args.resume = 1;
 		break;
 	default:
 		dev_dbg(dev->dev, "Failed to send v2 heartbeat event, flag:0x%x\n", flag);
 		return -EINVAL;
 	}

 	params.length = sizeof(args);
 	params.pointer = &args;

 	info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT_V2, &params);
 	if (!info)
 		return -EIO;

 	kfree(info);
 	return 0;
 }

 int apmf_update_fan_idx(struct amd_pmf_dev *pdev, bool manual, u32 idx)
 {
 	union acpi_object *info;
 	struct apmf_fan_idx args;
 	struct acpi_buffer params;

 	args.size = sizeof(args);
 	args.fan_ctl_mode = manual;
 	args.fan_ctl_idx = idx;

 	params.length = sizeof(args);
 	params.pointer = (void *)&args;

 	info = apmf_if_call(pdev, APMF_FUNC_SET_FAN_IDX, &params);
 	if (!info)
 		return -EIO;

 	kfree(info);
 	return 0;
 }

 int apmf_get_auto_mode_def(struct amd_pmf_dev *pdev, struct apmf_auto_mode *data)
 {
 	return apmf_if_call_store_buffer(pdev, APMF_FUNC_AUTO_MODE, data, sizeof(*data));
 }

 int apmf_get_sbios_requests_v2(struct amd_pmf_dev *pdev, struct apmf_sbios_req_v2 *req)
 {
 	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS, req, sizeof(*req));
 }

 int apmf_get_sbios_requests(struct amd_pmf_dev *pdev, struct apmf_sbios_req *req)
 {
 	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS,
 									 req, sizeof(*req));
 }

 static void apmf_event_handler(acpi_handle handle, u32 event, void *data)
 {
 	struct amd_pmf_dev *pmf_dev = data;
 	struct apmf_sbios_req req;
 	int ret;

 	mutex_lock(&pmf_dev->update_mutex);
 	ret = apmf_get_sbios_requests(pmf_dev, &req);
 	if (ret) {
 		dev_err(pmf_dev->dev, "Failed to get SBIOS requests:%d\n", ret);
 		goto out;
 	}

 	if (req.pending_req & BIT(APMF_AMT_NOTIFICATION)) {
 		dev_dbg(pmf_dev->dev, "AMT is supported and notifications %s\n",
 			req.amt_event ? "Enabled" : "Disabled");
 		pmf_dev->amt_enabled = !!req.amt_event;

 		if (pmf_dev->amt_enabled)
 			amd_pmf_handle_amt(pmf_dev);
 		else
 			amd_pmf_reset_amt(pmf_dev);
 	}

 	if (req.pending_req & BIT(APMF_CQL_NOTIFICATION)) {
 		dev_dbg(pmf_dev->dev, "CQL is supported and notifications %s\n",
 			req.cql_event ? "Enabled" : "Disabled");

 		/* update the target mode information */
 		if (pmf_dev->amt_enabled)
 			amd_pmf_update_2_cql(pmf_dev, req.cql_event);
 	}
 out:
 	mutex_unlock(&pmf_dev->update_mutex);
 }

 static int apmf_if_verify_interface(struct amd_pmf_dev *pdev)
 {
 	struct apmf_verify_interface output;
 	int err;

 	err = apmf_if_call_store_buffer(pdev, APMF_FUNC_VERIFY_INTERFACE, &output, sizeof(output));
 	if (err)
 		return err;

 	/* only set if not already set by a quirk */
 	if (!pdev->supported_func)
 		pdev->supported_func = output.supported_functions;

 	dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x version:%u\n",
 		output.supported_functions, output.notification_mask, output.version);

 	pdev->pmf_if_version = output.version;

 	return 0;
 }

 static int apmf_get_system_params(struct amd_pmf_dev *dev)
 {
 	struct apmf_system_params params;
 	int err;

 	if (!is_apmf_func_supported(dev, APMF_FUNC_GET_SYS_PARAMS))
 		return -EINVAL;

 	err = apmf_if_call_store_buffer(dev, APMF_FUNC_GET_SYS_PARAMS, &params, sizeof(params));
 	if (err)
 		return err;

 	dev_dbg(dev->dev, "system params mask:0x%x flags:0x%x cmd_code:0x%x heartbeat:%d\n",
 		params.valid_mask,
 		params.flags,
 		params.command_code,
 		params.heartbeat_int);
 	params.flags = params.flags & params.valid_mask;
 	dev->hb_interval = params.heartbeat_int;

 	return 0;
 }

 int apmf_get_dyn_slider_def_ac(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
 {
 	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_AC, data, sizeof(*data));
 }

 int apmf_get_dyn_slider_def_dc(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
 {
 	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_DC, data, sizeof(*data));
 }

 int apmf_install_handler(struct amd_pmf_dev *pmf_dev)
 {
 	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
 	acpi_status status;

 	/* Install the APMF Notify handler */
 	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
 	    is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS)) {
 		status = acpi_install_notify_handler(ahandle, ACPI_ALL_NOTIFY,
 						     apmf_event_handler, pmf_dev);
 		if (ACPI_FAILURE(status)) {
 			dev_err(pmf_dev->dev, "failed to install notify handler\n");
 			return -ENODEV;
 		}

 		/* Call the handler once manually to catch up with possibly missed notifies. */
 		apmf_event_handler(ahandle, 0, pmf_dev);
 	}

 	return 0;
 }

 static acpi_status apmf_walk_resources(struct acpi_resource *res, void *data)
 {
 	struct amd_pmf_dev *dev = data;

 	switch (res->type) {
 	case ACPI_RESOURCE_TYPE_ADDRESS64:
 		dev->policy_addr = res->data.address64.address.minimum;
 		dev->policy_sz = res->data.address64.address.address_length;
 		break;
 	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
 		dev->policy_addr = res->data.fixed_memory32.address;
 		dev->policy_sz = res->data.fixed_memory32.address_length;
 		break;
 	}

 	if (!dev->policy_addr || dev->policy_sz > POLICY_BUF_MAX_SZ || dev->policy_sz == 0) {
 		pr_err("Incorrect Policy params, possibly a SBIOS bug\n");
 		return AE_ERROR;
 	}

 	return AE_OK;
 }

 int apmf_check_smart_pc(struct amd_pmf_dev *pmf_dev)
 {
 	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
 	acpi_status status;

 	status = acpi_walk_resources(ahandle, METHOD_NAME__CRS, apmf_walk_resources, pmf_dev);
 	if (ACPI_FAILURE(status)) {
 		dev_dbg(pmf_dev->dev, "acpi_walk_resources failed :%d\n", status);
 		return -EINVAL;
 	}

 	return 0;
 }

 void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev)
 {
 	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);

 	if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1)
 		cancel_delayed_work_sync(&pmf_dev->heart_beat);

 	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
 	    is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS))
 		acpi_remove_notify_handler(ahandle, ACPI_ALL_NOTIFY, apmf_event_handler);
 }

 int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
 {
 	int ret;

 	ret = apmf_if_verify_interface(pmf_dev);
 	if (ret) {
 		dev_err(pmf_dev->dev, "APMF verify interface failed :%d\n", ret);
 		goto out;
 	}

 	ret = apmf_get_system_params(pmf_dev);
 	if (ret) {
 		dev_dbg(pmf_dev->dev, "APMF apmf_get_system_params failed :%d\n", ret);
 		goto out;
 	}

 	if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1) {
 		/* send heartbeats only if the interval is not zero */
 		INIT_DELAYED_WORK(&pmf_dev->heart_beat, apmf_sbios_heartbeat_notify);
 		schedule_delayed_work(&pmf_dev->heart_beat, 0);
 	}

 out:
 	return ret;
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* AMD Platform Management Framework Driver
	*
	* Copyright (c) 2022, Advanced Micro Devices, Inc.
	* All Rights Reserved.
	*
	* Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
	*/

	#include <linux/acpi.h>
	#include "pmf.h"

	#define APMF_CQL_NOTIFICATION 2
	#define APMF_AMT_NOTIFICATION 3

	static union acpi_object apmf_if_call(struct amd_pmf_dev pdev, int fn, struct acpi_buffer *param)
	{
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	acpi_handle ahandle = ACPI_HANDLE(pdev->dev);
	struct acpi_object_list apmf_if_arg_list;
	union acpi_object apmf_if_args[2];
	acpi_status status;

	apmf_if_arg_list.count = 2;
	apmf_if_arg_list.pointer = &apmf_if_args[0];

	apmf_if_args[0].type = ACPI_TYPE_INTEGER;
	apmf_if_args[0].integer.value = fn;

	if (param) {
	apmf_if_args[1].type = ACPI_TYPE_BUFFER;
	apmf_if_args[1].buffer.length = param->length;
	apmf_if_args[1].buffer.pointer = param->pointer;
	} else {
	apmf_if_args[1].type = ACPI_TYPE_INTEGER;
	apmf_if_args[1].integer.value = 0;
	}

	status = acpi_evaluate_object(ahandle, "APMF", &apmf_if_arg_list, &buffer);
	if (ACPI_FAILURE(status)) {
	dev_err(pdev->dev, "APMF method:%d call failed\n", fn);
	kfree(buffer.pointer);
	return NULL;
	}

	return buffer.pointer;
	}

	static int apmf_if_call_store_buffer(struct amd_pmf_dev pdev, int fn, void dest, size_t out_sz)
	{
	union acpi_object *info;
	size_t size;
	int err = 0;

	info = apmf_if_call(pdev, fn, NULL);
	if (!info)
	return -EIO;

	if (info->type != ACPI_TYPE_BUFFER) {
	dev_err(pdev->dev, "object is not a buffer\n");
	err = -EINVAL;
	goto out;
	}

	if (info->buffer.length < 2) {
	dev_err(pdev->dev, "buffer too small\n");
	err = -EINVAL;
	goto out;
	}

	size = (u16 )info->buffer.pointer;
	if (info->buffer.length < size) {
	dev_err(pdev->dev, "buffer smaller then headersize %u < %zu\n",
	info->buffer.length, size);
	err = -EINVAL;
	goto out;
	}

	if (size < out_sz) {
	dev_err(pdev->dev, "buffer too small %zu\n", size);
	err = -EINVAL;
	goto out;
	}

	memcpy(dest, info->buffer.pointer, out_sz);

	out:
	kfree(info);
	return err;
	}

	static union acpi_object apts_if_call(struct amd_pmf_dev pdev, u32 state_index)
	{
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	acpi_handle ahandle = ACPI_HANDLE(pdev->dev);
	struct acpi_object_list apts_if_arg_list;
	union acpi_object apts_if_args[3];
	acpi_status status;

	apts_if_arg_list.count = 3;
	apts_if_arg_list.pointer = &apts_if_args[0];

	apts_if_args[0].type = ACPI_TYPE_INTEGER;
	apts_if_args[0].integer.value = 1;
	apts_if_args[1].type = ACPI_TYPE_INTEGER;
	apts_if_args[1].integer.value = state_index;
	apts_if_args[2].type = ACPI_TYPE_INTEGER;
	apts_if_args[2].integer.value = 0;

	status = acpi_evaluate_object(ahandle, "APTS", &apts_if_arg_list, &buffer);
	if (ACPI_FAILURE(status)) {
	dev_err(pdev->dev, "APTS state_idx:%u call failed\n", state_index);
	kfree(buffer.pointer);
	return NULL;
	}

	return buffer.pointer;
	}

	static int apts_if_call_store_buffer(struct amd_pmf_dev *pdev,
	u32 index, void *data, size_t out_sz)
	{
	union acpi_object *info;
	size_t size;
	int err = 0;

	info = apts_if_call(pdev, index);
	if (!info)
	return -EIO;

	if (info->type != ACPI_TYPE_BUFFER) {
	dev_err(pdev->dev, "object is not a buffer\n");
	err = -EINVAL;
	goto out;
	}

	size = (u16 )info->buffer.pointer;
	if (info->buffer.length < size) {
	dev_err(pdev->dev, "buffer smaller than header size %u < %zu\n",
	info->buffer.length, size);
	err = -EINVAL;
	goto out;
	}

	if (size < out_sz) {
	dev_err(pdev->dev, "buffer too small %zu\n", size);
	err = -EINVAL;
	goto out;
	}

	memcpy(data, info->buffer.pointer, out_sz);
	out:
	kfree(info);
	return err;
	}

	int is_apmf_func_supported(struct amd_pmf_dev *pdev, unsigned long index)
	{
	/* If bit-n is set, that indicates function n+1 is supported */
	return !!(pdev->supported_func & BIT(index - 1));
	}

	int apts_get_static_slider_granular_v2(struct amd_pmf_dev *pdev,
	struct amd_pmf_apts_granular_output *data, u32 apts_idx)
	{
	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
	return -EINVAL;

	return apts_if_call_store_buffer(pdev, apts_idx, data, sizeof(*data));
	}

	int apmf_get_static_slider_granular_v2(struct amd_pmf_dev *pdev,
	struct apmf_static_slider_granular_output_v2 *data)
	{
	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
	return -EINVAL;

	return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
	data, sizeof(*data));
	}

	int apmf_get_static_slider_granular(struct amd_pmf_dev *pdev,
	struct apmf_static_slider_granular_output *data)
	{
	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
	return -EINVAL;

	return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
	data, sizeof(*data));
	}

	int apmf_os_power_slider_update(struct amd_pmf_dev *pdev, u8 event)
	{
	struct os_power_slider args;
	struct acpi_buffer params;
	union acpi_object *info;

	args.size = sizeof(args);
	args.slider_event = event;

	params.length = sizeof(args);
	params.pointer = (void *)&args;

	info = apmf_if_call(pdev, APMF_FUNC_OS_POWER_SLIDER_UPDATE, &params);
	if (!info)
	return -EIO;

	kfree(info);
	return 0;
	}

	static void apmf_sbios_heartbeat_notify(struct work_struct *work)
	{
	struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, heart_beat.work);
	union acpi_object *info;

	dev_dbg(dev->dev, "Sending heartbeat to SBIOS\n");
	info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT, NULL);
	if (!info)
	return;

	schedule_delayed_work(&dev->heart_beat, msecs_to_jiffies(dev->hb_interval * 1000));
	kfree(info);
	}

	int amd_pmf_notify_sbios_heartbeat_event_v2(struct amd_pmf_dev *dev, u8 flag)
	{
	struct sbios_hb_event_v2 args = { };
	struct acpi_buffer params;
	union acpi_object *info;

	args.size = sizeof(args);

	switch (flag) {
	case ON_LOAD:
	args.load = 1;
	break;
	case ON_UNLOAD:
	args.unload = 1;
	break;
	case ON_SUSPEND:
	args.suspend = 1;
	break;
	case ON_RESUME:
	args.resume = 1;
	break;
	default:
	dev_dbg(dev->dev, "Failed to send v2 heartbeat event, flag:0x%x\n", flag);
	return -EINVAL;
	}

	params.length = sizeof(args);
	params.pointer = &args;

	info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT_V2, &params);
	if (!info)
	return -EIO;

	kfree(info);
	return 0;
	}

	int apmf_update_fan_idx(struct amd_pmf_dev *pdev, bool manual, u32 idx)
	{
	union acpi_object *info;
	struct apmf_fan_idx args;
	struct acpi_buffer params;

	args.size = sizeof(args);
	args.fan_ctl_mode = manual;
	args.fan_ctl_idx = idx;

	params.length = sizeof(args);
	params.pointer = (void *)&args;

	info = apmf_if_call(pdev, APMF_FUNC_SET_FAN_IDX, &params);
	if (!info)
	return -EIO;

	kfree(info);
	return 0;
	}

	int apmf_get_auto_mode_def(struct amd_pmf_dev pdev, struct apmf_auto_mode data)
	{
	return apmf_if_call_store_buffer(pdev, APMF_FUNC_AUTO_MODE, data, sizeof(*data));
	}

	int apmf_get_sbios_requests_v2(struct amd_pmf_dev pdev, struct apmf_sbios_req_v2 req)
	{
	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS, req, sizeof(*req));
	}

	int apmf_get_sbios_requests(struct amd_pmf_dev pdev, struct apmf_sbios_req req)
	{
	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS,
	req, sizeof(*req));
	}

	static void apmf_event_handler(acpi_handle handle, u32 event, void *data)
	{
	struct amd_pmf_dev *pmf_dev = data;
	struct apmf_sbios_req req;
	int ret;

	mutex_lock(&pmf_dev->update_mutex);
	ret = apmf_get_sbios_requests(pmf_dev, &req);
	if (ret) {
	dev_err(pmf_dev->dev, "Failed to get SBIOS requests:%d\n", ret);
	goto out;
	}

	if (req.pending_req & BIT(APMF_AMT_NOTIFICATION)) {
	dev_dbg(pmf_dev->dev, "AMT is supported and notifications %s\n",
	req.amt_event ? "Enabled" : "Disabled");
	pmf_dev->amt_enabled = !!req.amt_event;

	if (pmf_dev->amt_enabled)
	amd_pmf_handle_amt(pmf_dev);
	else
	amd_pmf_reset_amt(pmf_dev);
	}

	if (req.pending_req & BIT(APMF_CQL_NOTIFICATION)) {
	dev_dbg(pmf_dev->dev, "CQL is supported and notifications %s\n",
	req.cql_event ? "Enabled" : "Disabled");

	/* update the target mode information */
	if (pmf_dev->amt_enabled)
	amd_pmf_update_2_cql(pmf_dev, req.cql_event);
	}
	out:
	mutex_unlock(&pmf_dev->update_mutex);
	}

	static int apmf_if_verify_interface(struct amd_pmf_dev *pdev)
	{
	struct apmf_verify_interface output;
	int err;

	err = apmf_if_call_store_buffer(pdev, APMF_FUNC_VERIFY_INTERFACE, &output, sizeof(output));
	if (err)
	return err;

	/* only set if not already set by a quirk */
	if (!pdev->supported_func)
	pdev->supported_func = output.supported_functions;

	dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x version:%u\n",
	output.supported_functions, output.notification_mask, output.version);

	pdev->pmf_if_version = output.version;

	return 0;
	}

	static int apmf_get_system_params(struct amd_pmf_dev *dev)
	{
	struct apmf_system_params params;
	int err;

	if (!is_apmf_func_supported(dev, APMF_FUNC_GET_SYS_PARAMS))
	return -EINVAL;

	err = apmf_if_call_store_buffer(dev, APMF_FUNC_GET_SYS_PARAMS, &params, sizeof(params));
	if (err)
	return err;

	dev_dbg(dev->dev, "system params mask:0x%x flags:0x%x cmd_code:0x%x heartbeat:%d\n",
	params.valid_mask,
	params.flags,
	params.command_code,
	params.heartbeat_int);
	params.flags = params.flags & params.valid_mask;
	dev->hb_interval = params.heartbeat_int;

	return 0;
	}

	int apmf_get_dyn_slider_def_ac(struct amd_pmf_dev pdev, struct apmf_dyn_slider_output data)
	{
	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_AC, data, sizeof(*data));
	}

	int apmf_get_dyn_slider_def_dc(struct amd_pmf_dev pdev, struct apmf_dyn_slider_output data)
	{
	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_DC, data, sizeof(*data));
	}

	int apmf_install_handler(struct amd_pmf_dev *pmf_dev)
	{
	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
	acpi_status status;

	/* Install the APMF Notify handler */
	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
	is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS)) {
	status = acpi_install_notify_handler(ahandle, ACPI_ALL_NOTIFY,
	apmf_event_handler, pmf_dev);
	if (ACPI_FAILURE(status)) {
	dev_err(pmf_dev->dev, "failed to install notify handler\n");
	return -ENODEV;
	}

	/* Call the handler once manually to catch up with possibly missed notifies. */
	apmf_event_handler(ahandle, 0, pmf_dev);
	}

	return 0;
	}

	static acpi_status apmf_walk_resources(struct acpi_resource res, void data)
	{
	struct amd_pmf_dev *dev = data;

	switch (res->type) {
	case ACPI_RESOURCE_TYPE_ADDRESS64:
	dev->policy_addr = res->data.address64.address.minimum;
	dev->policy_sz = res->data.address64.address.address_length;
	break;
	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
	dev->policy_addr = res->data.fixed_memory32.address;
	dev->policy_sz = res->data.fixed_memory32.address_length;
	break;
	}

	if (!dev->policy_addr \|\| dev->policy_sz > POLICY_BUF_MAX_SZ \|\| dev->policy_sz == 0) {
	pr_err("Incorrect Policy params, possibly a SBIOS bug\n");
	return AE_ERROR;
	}

	return AE_OK;
	}

	int apmf_check_smart_pc(struct amd_pmf_dev *pmf_dev)
	{
	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
	acpi_status status;

	status = acpi_walk_resources(ahandle, METHOD_NAME__CRS, apmf_walk_resources, pmf_dev);
	if (ACPI_FAILURE(status)) {
	dev_dbg(pmf_dev->dev, "acpi_walk_resources failed :%d\n", status);
	return -EINVAL;
	}

	return 0;
	}

	void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev)
	{
	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);

	if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1)
	cancel_delayed_work_sync(&pmf_dev->heart_beat);

	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
	is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS))
	acpi_remove_notify_handler(ahandle, ACPI_ALL_NOTIFY, apmf_event_handler);
	}

	int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
	{
	int ret;

	ret = apmf_if_verify_interface(pmf_dev);
	if (ret) {
	dev_err(pmf_dev->dev, "APMF verify interface failed :%d\n", ret);
	goto out;
	}

	ret = apmf_get_system_params(pmf_dev);
	if (ret) {
	dev_dbg(pmf_dev->dev, "APMF apmf_get_system_params failed :%d\n", ret);
	goto out;
	}

	if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1) {
	/* send heartbeats only if the interval is not zero */
	INIT_DELAYED_WORK(&pmf_dev->heart_beat, apmf_sbios_heartbeat_notify);
	schedule_delayed_work(&pmf_dev->heart_beat, 0);
	}

	out:
	return ret;
	}