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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/debugfs.h>
#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;
/* Sideload policy binaries to debug policy failures */
static bool pb_side_load;
#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)");
module_param(pb_side_load, bool, 0444);
MODULE_PARM_DESC(pb_side_load, "Sideload policy binaries debug policy failures");
#endif
static const uuid_t amd_pmf_ta_uuid = UUID_INIT(0x6fd93b77, 0x3fb8, 0x524d,
0xb1, 0x2d, 0xc5, 0x29, 0xb1, 0x3d, 0x85, 0x43);
static const char *amd_pmf_uevent_as_str(unsigned int state)
{
switch (state) {
case SYSTEM_STATE_S0i3:
return "S0i3";
case SYSTEM_STATE_S4:
return "S4";
case SYSTEM_STATE_SCREEN_LOCK:
return "SCREEN_LOCK";
default:
return "Unknown Smart PC event";
}
}
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 void amd_pmf_update_uevents(struct amd_pmf_dev *dev, u16 event)
{
input_report_key(dev->pmf_idev, event, 1); /* key press */
input_sync(dev->pmf_idev);
input_report_key(dev->pmf_idev, event, 0); /* key release */
input_sync(dev->pmf_idev);
}
static void amd_pmf_apply_policies(struct amd_pmf_dev *dev, struct ta_pmf_enact_result *out)
{
u32 val;
int idx;
for (idx = 0; idx < out->actions_count; idx++) {
val = out->actions_list[idx].value;
switch (out->actions_list[idx].action_index) {
case PMF_POLICY_SPL:
if (dev->prev_data->spl != val) {
amd_pmf_send_cmd(dev, SET_SPL, false, val, NULL);
dev_dbg(dev->dev, "update SPL: %u\n", val);
dev->prev_data->spl = val;
}
break;
case PMF_POLICY_SPPT:
if (dev->prev_data->sppt != val) {
amd_pmf_send_cmd(dev, SET_SPPT, false, val, NULL);
dev_dbg(dev->dev, "update SPPT: %u\n", val);
dev->prev_data->sppt = val;
}
break;
case PMF_POLICY_FPPT:
if (dev->prev_data->fppt != val) {
amd_pmf_send_cmd(dev, SET_FPPT, false, val, NULL);
dev_dbg(dev->dev, "update FPPT: %u\n", val);
dev->prev_data->fppt = val;
}
break;
case PMF_POLICY_SPPT_APU_ONLY:
if (dev->prev_data->sppt_apuonly != val) {
amd_pmf_send_cmd(dev, SET_SPPT_APU_ONLY, false, val, NULL);
dev_dbg(dev->dev, "update SPPT_APU_ONLY: %u\n", val);
dev->prev_data->sppt_apuonly = val;
}
break;
case PMF_POLICY_STT_MIN:
if (dev->prev_data->stt_minlimit != val) {
amd_pmf_send_cmd(dev, SET_STT_MIN_LIMIT, false, val, NULL);
dev_dbg(dev->dev, "update STT_MIN: %u\n", val);
dev->prev_data->stt_minlimit = val;
}
break;
case PMF_POLICY_STT_SKINTEMP_APU:
if (dev->prev_data->stt_skintemp_apu != val) {
amd_pmf_send_cmd(dev, SET_STT_LIMIT_APU, false, val, NULL);
dev_dbg(dev->dev, "update STT_SKINTEMP_APU: %u\n", val);
dev->prev_data->stt_skintemp_apu = val;
}
break;
case PMF_POLICY_STT_SKINTEMP_HS2:
if (dev->prev_data->stt_skintemp_hs2 != val) {
amd_pmf_send_cmd(dev, SET_STT_LIMIT_HS2, false, val, NULL);
dev_dbg(dev->dev, "update STT_SKINTEMP_HS2: %u\n", val);
dev->prev_data->stt_skintemp_hs2 = val;
}
break;
case PMF_POLICY_P3T:
if (dev->prev_data->p3t_limit != val) {
amd_pmf_send_cmd(dev, SET_P3T, false, val, NULL);
dev_dbg(dev->dev, "update P3T: %u\n", val);
dev->prev_data->p3t_limit = val;
}
break;
case PMF_POLICY_SYSTEM_STATE:
switch (val) {
case 0:
amd_pmf_update_uevents(dev, KEY_SLEEP);
break;
case 1:
amd_pmf_update_uevents(dev, KEY_SUSPEND);
break;
case 2:
amd_pmf_update_uevents(dev, KEY_SCREENLOCK);
break;
default:
dev_err(dev->dev, "Invalid PMF policy system state: %d\n", val);
}
dev_dbg(dev->dev, "update SYSTEM_STATE: %s\n",
amd_pmf_uevent_as_str(val));
break;
}
}
}
static int amd_pmf_invoke_cmd_enact(struct amd_pmf_dev *dev)
{
struct ta_pmf_shared_memory *ta_sm = NULL;
struct ta_pmf_enact_result *out = NULL;
struct ta_pmf_enact_table *in = NULL;
struct tee_param param[MAX_TEE_PARAM];
struct tee_ioctl_invoke_arg arg;
int ret = 0;
if (!dev->tee_ctx)
return -ENODEV;
memset(dev->shbuf, 0, dev->policy_sz);
ta_sm = dev->shbuf;
out = &ta_sm->pmf_output.policy_apply_table;
in = &ta_sm->pmf_input.enact_table;
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_populate_ta_inputs(dev, in);
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;
}
if (ta_sm->pmf_result == TA_PMF_TYPE_SUCCESS && out->actions_count) {
amd_pmf_dump_ta_inputs(dev, in);
dev_dbg(dev->dev, "action count:%u result:%x\n", out->actions_count,
ta_sm->pmf_result);
amd_pmf_apply_policies(dev, out);
}
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 ta_pmf_init_table *in = NULL;
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;
}
dev_dbg(dev->dev, "Policy Binary size: %u bytes\n", dev->policy_sz);
memset(dev->shbuf, 0, dev->policy_sz);
ta_sm = dev->shbuf;
in = &ta_sm->pmf_input.init_table;
ta_sm->command_id = TA_PMF_COMMAND_POLICY_BUILDER_INITIALIZE;
ta_sm->if_version = PMF_TA_IF_VERSION_MAJOR;
in->metadata_macrocheck = false;
in->sku_check = false;
in->validate = true;
in->frequency = pb_actions_ms;
in->policies_table.table_size = dev->policy_sz;
memcpy(in->policies_table.table, dev->policy_buf, dev->policy_sz);
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_start_policy_engine(struct amd_pmf_dev *dev)
{
struct cookie_header *header;
int res;
if (dev->policy_sz < POLICY_COOKIE_OFFSET + sizeof(*header))
return -EINVAL;
header = (struct cookie_header *)(dev->policy_buf + POLICY_COOKIE_OFFSET);
if (header->sign != POLICY_SIGN_COOKIE || !header->length) {
dev_dbg(dev->dev, "cookie doesn't match\n");
return -EINVAL;
}
if (dev->policy_sz < header->length + 512)
return -EINVAL;
/* Update the actual length */
dev->policy_sz = header->length + 512;
res = amd_pmf_invoke_cmd_init(dev);
if (res == TA_PMF_TYPE_SUCCESS) {
/* Now its safe to announce that smart pc is enabled */
dev->smart_pc_enabled = true;
/*
* Start collecting the data from TA FW after a small delay
* or else, we might end up getting stale values.
*/
schedule_delayed_work(&dev->pb_work, msecs_to_jiffies(pb_actions_ms * 3));
} else {
dev_err(dev->dev, "ta invoke cmd init failed err: %x\n", res);
dev->smart_pc_enabled = false;
return -EIO;
}
return 0;
}
#ifdef CONFIG_AMD_PMF_DEBUG
static void amd_pmf_hex_dump_pb(struct amd_pmf_dev *dev)
{
print_hex_dump_debug("(pb): ", DUMP_PREFIX_OFFSET, 16, 1, dev->policy_buf,
dev->policy_sz, false);
}
static ssize_t amd_pmf_get_pb_data(struct file *filp, const char __user *buf,
size_t length, loff_t *pos)
{
struct amd_pmf_dev *dev = filp->private_data;
unsigned char *new_policy_buf;
int ret;
/* Policy binary size cannot exceed POLICY_BUF_MAX_SZ */
if (length > POLICY_BUF_MAX_SZ || length == 0)
return -EINVAL;
/* re-alloc to the new buffer length of the policy binary */
new_policy_buf = memdup_user(buf, length);
if (IS_ERR(new_policy_buf))
return PTR_ERR(new_policy_buf);
kfree(dev->policy_buf);
dev->policy_buf = new_policy_buf;
dev->policy_sz = length;
amd_pmf_hex_dump_pb(dev);
ret = amd_pmf_start_policy_engine(dev);
if (ret < 0)
return ret;
return length;
}
static const struct file_operations pb_fops = {
.write = amd_pmf_get_pb_data,
.open = simple_open,
};
static void amd_pmf_open_pb(struct amd_pmf_dev *dev, struct dentry *debugfs_root)
{
dev->esbin = debugfs_create_dir("pb", debugfs_root);
debugfs_create_file("update_policy", 0644, dev->esbin, dev, &pb_fops);
}
static void amd_pmf_remove_pb(struct amd_pmf_dev *dev)
{
debugfs_remove_recursive(dev->esbin);
}
#else
static void amd_pmf_open_pb(struct amd_pmf_dev *dev, struct dentry *debugfs_root) {}
static void amd_pmf_remove_pb(struct amd_pmf_dev *dev) {}
static void amd_pmf_hex_dump_pb(struct amd_pmf_dev *dev) {}
#endif
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_register_input_device(struct amd_pmf_dev *dev)
{
int err;
dev->pmf_idev = devm_input_allocate_device(dev->dev);
if (!dev->pmf_idev)
return -ENOMEM;
dev->pmf_idev->name = "PMF-TA output events";
dev->pmf_idev->phys = "amd-pmf/input0";
input_set_capability(dev->pmf_idev, EV_KEY, KEY_SLEEP);
input_set_capability(dev->pmf_idev, EV_KEY, KEY_SCREENLOCK);
input_set_capability(dev->pmf_idev, EV_KEY, KEY_SUSPEND);
err = input_register_device(dev->pmf_idev);
if (err) {
dev_err(dev->dev, "Failed to register input device: %d\n", err);
return err;
}
return 0;
}
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->policy_sz;
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 = apmf_check_smart_pc(dev);
if (ret) {
/*
* Lets not return from here if Smart PC bit is not advertised in
* the BIOS. This way, there will be some amount of power savings
* to the user with static slider (if enabled).
*/
dev_info(dev->dev, "PMF Smart PC not advertised in BIOS!:%d\n", ret);
return -ENODEV;
}
ret = amd_pmf_tee_init(dev);
if (ret)
return ret;
INIT_DELAYED_WORK(&dev->pb_work, amd_pmf_invoke_cmd);
ret = amd_pmf_set_dram_addr(dev, true);
if (ret)
goto error;
dev->policy_base = devm_ioremap(dev->dev, dev->policy_addr, dev->policy_sz);
if (!dev->policy_base) {
ret = -ENOMEM;
goto error;
}
dev->policy_buf = kzalloc(dev->policy_sz, GFP_KERNEL);
if (!dev->policy_buf) {
ret = -ENOMEM;
goto error;
}
memcpy_fromio(dev->policy_buf, dev->policy_base, dev->policy_sz);
amd_pmf_hex_dump_pb(dev);
dev->prev_data = kzalloc(sizeof(*dev->prev_data), GFP_KERNEL);
if (!dev->prev_data) {
ret = -ENOMEM;
goto error;
}
ret = amd_pmf_start_policy_engine(dev);
if (ret)
goto error;
if (pb_side_load)
amd_pmf_open_pb(dev, dev->dbgfs_dir);
ret = amd_pmf_register_input_device(dev);
if (ret)
goto error;
return 0;
error:
amd_pmf_deinit_smart_pc(dev);
return ret;
}
void amd_pmf_deinit_smart_pc(struct amd_pmf_dev *dev)
{
if (dev->pmf_idev)
input_unregister_device(dev->pmf_idev);
if (pb_side_load && dev->esbin)
amd_pmf_remove_pb(dev);
cancel_delayed_work_sync(&dev->pb_work);
kfree(dev->prev_data);
dev->prev_data = NULL;
kfree(dev->policy_buf);
dev->policy_buf = NULL;
kfree(dev->buf);
dev->buf = NULL;
amd_pmf_tee_deinit(dev);
}
|