blob: 081e84e116e792a0aeb48922a68ed07680bcdd87 [file] [log] [blame]
// 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;
}
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 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));
}
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)
goto out;
schedule_delayed_work(&dev->heart_beat, msecs_to_jiffies(dev->hb_interval * 1000));
out:
kfree(info);
}
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;
int err = 0;
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) {
err = -EIO;
goto out;
}
out:
kfree(info);
return err;
}
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(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;
pdev->supported_func = output.supported_functions;
dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x\n",
output.supported_functions, output.notification_mask);
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;
}
void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev)
{
acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
if (pmf_dev->hb_interval)
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_err(pmf_dev->dev, "APMF apmf_get_system_params failed :%d\n", ret);
goto out;
}
if (pmf_dev->hb_interval) {
/* 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;
}