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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* AMD 3D V-Cache Performance Optimizer Driver
*
* Copyright (c) 2024, Advanced Micro Devices, Inc.
* All Rights Reserved.
*
* Authors: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
* Perry Yuan <perry.yuan@amd.com>
* Mario Limonciello <mario.limonciello@amd.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/array_size.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/sysfs.h>
#include <linux/uuid.h>
static char *x3d_mode = "frequency";
module_param(x3d_mode, charp, 0);
MODULE_PARM_DESC(x3d_mode, "Initial 3D-VCache mode; 'frequency' (default) or 'cache'");
#define DSM_REVISION_ID 0
#define DSM_SET_X3D_MODE 1
static guid_t x3d_guid = GUID_INIT(0xdff8e55f, 0xbcfd, 0x46fb, 0xba, 0x0a,
0xef, 0xd0, 0x45, 0x0f, 0x34, 0xee);
enum amd_x3d_mode_type {
MODE_INDEX_FREQ,
MODE_INDEX_CACHE,
};
static const char * const amd_x3d_mode_strings[] = {
[MODE_INDEX_FREQ] = "frequency",
[MODE_INDEX_CACHE] = "cache",
};
struct amd_x3d_dev {
struct device *dev;
acpi_handle ahandle;
/* To protect x3d mode setting */
struct mutex lock;
enum amd_x3d_mode_type curr_mode;
};
static int amd_x3d_get_mode(struct amd_x3d_dev *data)
{
guard(mutex)(&data->lock);
return data->curr_mode;
}
static int amd_x3d_mode_switch(struct amd_x3d_dev *data, int new_state)
{
union acpi_object *out, argv;
guard(mutex)(&data->lock);
argv.type = ACPI_TYPE_INTEGER;
argv.integer.value = new_state;
out = acpi_evaluate_dsm(data->ahandle, &x3d_guid, DSM_REVISION_ID,
DSM_SET_X3D_MODE, &argv);
if (!out) {
dev_err(data->dev, "failed to evaluate _DSM\n");
return -EINVAL;
}
data->curr_mode = new_state;
kfree(out);
return 0;
}
static ssize_t amd_x3d_mode_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct amd_x3d_dev *data = dev_get_drvdata(dev);
int ret;
ret = sysfs_match_string(amd_x3d_mode_strings, buf);
if (ret < 0)
return ret;
ret = amd_x3d_mode_switch(data, ret);
if (ret < 0)
return ret;
return count;
}
static ssize_t amd_x3d_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct amd_x3d_dev *data = dev_get_drvdata(dev);
int mode = amd_x3d_get_mode(data);
return sysfs_emit(buf, "%s\n", amd_x3d_mode_strings[mode]);
}
static DEVICE_ATTR_RW(amd_x3d_mode);
static struct attribute *amd_x3d_attrs[] = {
&dev_attr_amd_x3d_mode.attr,
NULL
};
ATTRIBUTE_GROUPS(amd_x3d);
static int amd_x3d_resume_handler(struct device *dev)
{
struct amd_x3d_dev *data = dev_get_drvdata(dev);
int ret = amd_x3d_get_mode(data);
return amd_x3d_mode_switch(data, ret);
}
static DEFINE_SIMPLE_DEV_PM_OPS(amd_x3d_pm, NULL, amd_x3d_resume_handler);
static const struct acpi_device_id amd_x3d_acpi_ids[] = {
{"AMDI0101"},
{ },
};
MODULE_DEVICE_TABLE(acpi, amd_x3d_acpi_ids);
static int amd_x3d_probe(struct platform_device *pdev)
{
struct amd_x3d_dev *data;
acpi_handle handle;
int ret;
handle = ACPI_HANDLE(&pdev->dev);
if (!handle)
return -ENODEV;
if (!acpi_check_dsm(handle, &x3d_guid, DSM_REVISION_ID, BIT(DSM_SET_X3D_MODE)))
return -ENODEV;
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->dev = &pdev->dev;
ret = devm_mutex_init(data->dev, &data->lock);
if (ret)
return ret;
data->ahandle = handle;
platform_set_drvdata(pdev, data);
ret = match_string(amd_x3d_mode_strings, ARRAY_SIZE(amd_x3d_mode_strings), x3d_mode);
if (ret < 0)
return dev_err_probe(&pdev->dev, -EINVAL, "invalid mode %s\n", x3d_mode);
return amd_x3d_mode_switch(data, ret);
}
static struct platform_driver amd_3d_vcache_driver = {
.driver = {
.name = "amd_x3d_vcache",
.dev_groups = amd_x3d_groups,
.acpi_match_table = amd_x3d_acpi_ids,
.pm = pm_sleep_ptr(&amd_x3d_pm),
},
.probe = amd_x3d_probe,
};
module_platform_driver(amd_3d_vcache_driver);
MODULE_DESCRIPTION("AMD 3D V-Cache Performance Optimizer Driver");
MODULE_LICENSE("GPL");
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