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// SPDX-License-Identifier: GPL-2.0-only
/*
* AMD Secure Processor Dynamic Boost Control interface
*
* Copyright (C) 2023 Advanced Micro Devices, Inc.
*
* Author: Mario Limonciello <mario.limonciello@amd.com>
*/
#include "dbc.h"
struct error_map {
u32 psp;
int ret;
};
#define DBC_ERROR_ACCESS_DENIED 0x0001
#define DBC_ERROR_EXCESS_DATA 0x0004
#define DBC_ERROR_BAD_PARAMETERS 0x0006
#define DBC_ERROR_BAD_STATE 0x0007
#define DBC_ERROR_NOT_IMPLEMENTED 0x0009
#define DBC_ERROR_BUSY 0x000D
#define DBC_ERROR_MESSAGE_FAILURE 0x0307
#define DBC_ERROR_OVERFLOW 0x300F
#define DBC_ERROR_SIGNATURE_INVALID 0x3072
static struct error_map error_codes[] = {
{DBC_ERROR_ACCESS_DENIED, -EACCES},
{DBC_ERROR_EXCESS_DATA, -E2BIG},
{DBC_ERROR_BAD_PARAMETERS, -EINVAL},
{DBC_ERROR_BAD_STATE, -EAGAIN},
{DBC_ERROR_MESSAGE_FAILURE, -ENOENT},
{DBC_ERROR_NOT_IMPLEMENTED, -ENOENT},
{DBC_ERROR_BUSY, -EBUSY},
{DBC_ERROR_OVERFLOW, -ENFILE},
{DBC_ERROR_SIGNATURE_INVALID, -EPERM},
{0x0, 0x0},
};
static int send_dbc_cmd(struct psp_dbc_device *dbc_dev,
enum psp_platform_access_msg msg)
{
int ret;
dbc_dev->mbox->req.header.status = 0;
ret = psp_send_platform_access_msg(msg, (struct psp_request *)dbc_dev->mbox);
if (ret == -EIO) {
int i;
dev_dbg(dbc_dev->dev,
"msg 0x%x failed with PSP error: 0x%x\n",
msg, dbc_dev->mbox->req.header.status);
for (i = 0; error_codes[i].psp; i++) {
if (dbc_dev->mbox->req.header.status == error_codes[i].psp)
return error_codes[i].ret;
}
}
return ret;
}
static int send_dbc_nonce(struct psp_dbc_device *dbc_dev)
{
int ret;
dbc_dev->mbox->req.header.payload_size = sizeof(dbc_dev->mbox->dbc_nonce);
ret = send_dbc_cmd(dbc_dev, PSP_DYNAMIC_BOOST_GET_NONCE);
if (ret == -EAGAIN) {
dev_dbg(dbc_dev->dev, "retrying get nonce\n");
ret = send_dbc_cmd(dbc_dev, PSP_DYNAMIC_BOOST_GET_NONCE);
}
return ret;
}
static int send_dbc_parameter(struct psp_dbc_device *dbc_dev)
{
dbc_dev->mbox->req.header.payload_size = sizeof(dbc_dev->mbox->dbc_param);
switch (dbc_dev->mbox->dbc_param.user.msg_index) {
case PARAM_SET_FMAX_CAP:
case PARAM_SET_PWR_CAP:
case PARAM_SET_GFX_MODE:
return send_dbc_cmd(dbc_dev, PSP_DYNAMIC_BOOST_SET_PARAMETER);
case PARAM_GET_FMAX_CAP:
case PARAM_GET_PWR_CAP:
case PARAM_GET_CURR_TEMP:
case PARAM_GET_FMAX_MAX:
case PARAM_GET_FMAX_MIN:
case PARAM_GET_SOC_PWR_MAX:
case PARAM_GET_SOC_PWR_MIN:
case PARAM_GET_SOC_PWR_CUR:
case PARAM_GET_GFX_MODE:
return send_dbc_cmd(dbc_dev, PSP_DYNAMIC_BOOST_GET_PARAMETER);
}
return -EINVAL;
}
void dbc_dev_destroy(struct psp_device *psp)
{
struct psp_dbc_device *dbc_dev = psp->dbc_data;
if (!dbc_dev)
return;
misc_deregister(&dbc_dev->char_dev);
mutex_destroy(&dbc_dev->ioctl_mutex);
psp->dbc_data = NULL;
}
static long dbc_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct psp_device *psp_master = psp_get_master_device();
void __user *argp = (void __user *)arg;
struct psp_dbc_device *dbc_dev;
int ret;
if (!psp_master || !psp_master->dbc_data)
return -ENODEV;
dbc_dev = psp_master->dbc_data;
mutex_lock(&dbc_dev->ioctl_mutex);
switch (cmd) {
case DBCIOCNONCE:
if (copy_from_user(&dbc_dev->mbox->dbc_nonce.user, argp,
sizeof(struct dbc_user_nonce))) {
ret = -EFAULT;
goto unlock;
}
ret = send_dbc_nonce(dbc_dev);
if (ret)
goto unlock;
if (copy_to_user(argp, &dbc_dev->mbox->dbc_nonce.user,
sizeof(struct dbc_user_nonce))) {
ret = -EFAULT;
goto unlock;
}
break;
case DBCIOCUID:
dbc_dev->mbox->req.header.payload_size = sizeof(dbc_dev->mbox->dbc_set_uid);
if (copy_from_user(&dbc_dev->mbox->dbc_set_uid.user, argp,
sizeof(struct dbc_user_setuid))) {
ret = -EFAULT;
goto unlock;
}
ret = send_dbc_cmd(dbc_dev, PSP_DYNAMIC_BOOST_SET_UID);
if (ret)
goto unlock;
if (copy_to_user(argp, &dbc_dev->mbox->dbc_set_uid.user,
sizeof(struct dbc_user_setuid))) {
ret = -EFAULT;
goto unlock;
}
break;
case DBCIOCPARAM:
if (copy_from_user(&dbc_dev->mbox->dbc_param.user, argp,
sizeof(struct dbc_user_param))) {
ret = -EFAULT;
goto unlock;
}
ret = send_dbc_parameter(dbc_dev);
if (ret)
goto unlock;
if (copy_to_user(argp, &dbc_dev->mbox->dbc_param.user,
sizeof(struct dbc_user_param))) {
ret = -EFAULT;
goto unlock;
}
break;
default:
ret = -EINVAL;
}
unlock:
mutex_unlock(&dbc_dev->ioctl_mutex);
return ret;
}
static const struct file_operations dbc_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = dbc_ioctl,
};
int dbc_dev_init(struct psp_device *psp)
{
struct device *dev = psp->dev;
struct psp_dbc_device *dbc_dev;
int ret;
if (!PSP_FEATURE(psp, DBC))
return 0;
dbc_dev = devm_kzalloc(dev, sizeof(*dbc_dev), GFP_KERNEL);
if (!dbc_dev)
return -ENOMEM;
BUILD_BUG_ON(sizeof(union dbc_buffer) > PAGE_SIZE);
dbc_dev->mbox = (void *)devm_get_free_pages(dev, GFP_KERNEL | __GFP_ZERO, 0);
if (!dbc_dev->mbox) {
ret = -ENOMEM;
goto cleanup_dev;
}
psp->dbc_data = dbc_dev;
dbc_dev->dev = dev;
ret = send_dbc_nonce(dbc_dev);
if (ret == -EACCES) {
dev_dbg(dbc_dev->dev,
"dynamic boost control was previously authenticated\n");
ret = 0;
}
dev_dbg(dbc_dev->dev, "dynamic boost control is %savailable\n",
ret ? "un" : "");
if (ret) {
ret = 0;
goto cleanup_mbox;
}
dbc_dev->char_dev.minor = MISC_DYNAMIC_MINOR;
dbc_dev->char_dev.name = "dbc";
dbc_dev->char_dev.fops = &dbc_fops;
dbc_dev->char_dev.mode = 0600;
ret = misc_register(&dbc_dev->char_dev);
if (ret)
goto cleanup_mbox;
mutex_init(&dbc_dev->ioctl_mutex);
return 0;
cleanup_mbox:
devm_free_pages(dev, (unsigned long)dbc_dev->mbox);
cleanup_dev:
psp->dbc_data = NULL;
devm_kfree(dev, dbc_dev);
return ret;
}
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