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// SPDX-License-Identifier: GPL-2.0
/*
* AMD Platform Management Framework Driver - TEE Interface
*
* Copyright (c) 2023, Advanced Micro Devices, Inc.
* All Rights Reserved.
*
* Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
*/
#include <linux/tee_drv.h>
#include <linux/uuid.h>
#include "pmf.h"
#define MAX_TEE_PARAM 4
/* Policy binary actions sampling frequency (in ms) */
static int pb_actions_ms = MSEC_PER_SEC;
#ifdef CONFIG_AMD_PMF_DEBUG
module_param(pb_actions_ms, int, 0644);
MODULE_PARM_DESC(pb_actions_ms, "Policy binary actions sampling frequency (default = 1000ms)");
#endif
static const uuid_t amd_pmf_ta_uuid = UUID_INIT(0x6fd93b77, 0x3fb8, 0x524d,
0xb1, 0x2d, 0xc5, 0x29, 0xb1, 0x3d, 0x85, 0x43);
static void amd_pmf_prepare_args(struct amd_pmf_dev *dev, int cmd,
struct tee_ioctl_invoke_arg *arg,
struct tee_param *param)
{
memset(arg, 0, sizeof(*arg));
memset(param, 0, MAX_TEE_PARAM * sizeof(*param));
arg->func = cmd;
arg->session = dev->session_id;
arg->num_params = MAX_TEE_PARAM;
/* Fill invoke cmd params */
param[0].u.memref.size = sizeof(struct ta_pmf_shared_memory);
param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT;
param[0].u.memref.shm = dev->fw_shm_pool;
param[0].u.memref.shm_offs = 0;
}
static int amd_pmf_invoke_cmd_enact(struct amd_pmf_dev *dev)
{
struct ta_pmf_shared_memory *ta_sm = NULL;
struct tee_param param[MAX_TEE_PARAM];
struct tee_ioctl_invoke_arg arg;
int ret = 0;
if (!dev->tee_ctx)
return -ENODEV;
ta_sm = dev->shbuf;
memset(ta_sm, 0, sizeof(*ta_sm));
ta_sm->command_id = TA_PMF_COMMAND_POLICY_BUILDER_ENACT_POLICIES;
ta_sm->if_version = PMF_TA_IF_VERSION_MAJOR;
amd_pmf_prepare_args(dev, TA_PMF_COMMAND_POLICY_BUILDER_ENACT_POLICIES, &arg, param);
ret = tee_client_invoke_func(dev->tee_ctx, &arg, param);
if (ret < 0 || arg.ret != 0) {
dev_err(dev->dev, "TEE enact cmd failed. err: %x, ret:%d\n", arg.ret, ret);
return ret;
}
return 0;
}
static int amd_pmf_invoke_cmd_init(struct amd_pmf_dev *dev)
{
struct ta_pmf_shared_memory *ta_sm = NULL;
struct tee_param param[MAX_TEE_PARAM];
struct tee_ioctl_invoke_arg arg;
int ret = 0;
if (!dev->tee_ctx) {
dev_err(dev->dev, "Failed to get TEE context\n");
return -ENODEV;
}
ta_sm = dev->shbuf;
ta_sm->command_id = TA_PMF_COMMAND_POLICY_BUILDER_INITIALIZE;
ta_sm->if_version = PMF_TA_IF_VERSION_MAJOR;
amd_pmf_prepare_args(dev, TA_PMF_COMMAND_POLICY_BUILDER_INITIALIZE, &arg, param);
ret = tee_client_invoke_func(dev->tee_ctx, &arg, param);
if (ret < 0 || arg.ret != 0) {
dev_err(dev->dev, "Failed to invoke TEE init cmd. err: %x, ret:%d\n", arg.ret, ret);
return ret;
}
return ta_sm->pmf_result;
}
static void amd_pmf_invoke_cmd(struct work_struct *work)
{
struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, pb_work.work);
amd_pmf_invoke_cmd_enact(dev);
schedule_delayed_work(&dev->pb_work, msecs_to_jiffies(pb_actions_ms));
}
static int amd_pmf_amdtee_ta_match(struct tee_ioctl_version_data *ver, const void *data)
{
return ver->impl_id == TEE_IMPL_ID_AMDTEE;
}
static int amd_pmf_ta_open_session(struct tee_context *ctx, u32 *id)
{
struct tee_ioctl_open_session_arg sess_arg = {};
int rc;
export_uuid(sess_arg.uuid, &amd_pmf_ta_uuid);
sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC;
sess_arg.num_params = 0;
rc = tee_client_open_session(ctx, &sess_arg, NULL);
if (rc < 0 || sess_arg.ret != 0) {
pr_err("Failed to open TEE session err:%#x, rc:%d\n", sess_arg.ret, rc);
return rc;
}
*id = sess_arg.session;
return rc;
}
static int amd_pmf_tee_init(struct amd_pmf_dev *dev)
{
u32 size;
int ret;
dev->tee_ctx = tee_client_open_context(NULL, amd_pmf_amdtee_ta_match, NULL, NULL);
if (IS_ERR(dev->tee_ctx)) {
dev_err(dev->dev, "Failed to open TEE context\n");
return PTR_ERR(dev->tee_ctx);
}
ret = amd_pmf_ta_open_session(dev->tee_ctx, &dev->session_id);
if (ret) {
dev_err(dev->dev, "Failed to open TA session (%d)\n", ret);
ret = -EINVAL;
goto out_ctx;
}
size = sizeof(struct ta_pmf_shared_memory);
dev->fw_shm_pool = tee_shm_alloc_kernel_buf(dev->tee_ctx, size);
if (IS_ERR(dev->fw_shm_pool)) {
dev_err(dev->dev, "Failed to alloc TEE shared memory\n");
ret = PTR_ERR(dev->fw_shm_pool);
goto out_sess;
}
dev->shbuf = tee_shm_get_va(dev->fw_shm_pool, 0);
if (IS_ERR(dev->shbuf)) {
dev_err(dev->dev, "Failed to get TEE virtual address\n");
ret = PTR_ERR(dev->shbuf);
goto out_shm;
}
dev_dbg(dev->dev, "TEE init done\n");
return 0;
out_shm:
tee_shm_free(dev->fw_shm_pool);
out_sess:
tee_client_close_session(dev->tee_ctx, dev->session_id);
out_ctx:
tee_client_close_context(dev->tee_ctx);
return ret;
}
static void amd_pmf_tee_deinit(struct amd_pmf_dev *dev)
{
tee_shm_free(dev->fw_shm_pool);
tee_client_close_session(dev->tee_ctx, dev->session_id);
tee_client_close_context(dev->tee_ctx);
}
int amd_pmf_init_smart_pc(struct amd_pmf_dev *dev)
{
int ret;
ret = amd_pmf_tee_init(dev);
if (ret)
return ret;
INIT_DELAYED_WORK(&dev->pb_work, amd_pmf_invoke_cmd);
return 0;
}
void amd_pmf_deinit_smart_pc(struct amd_pmf_dev *dev)
{
cancel_delayed_work_sync(&dev->pb_work);
amd_pmf_tee_deinit(dev);
}
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