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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
// Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES.
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/thermal.h>
#include <linux/err.h>
#include <linux/mlx5/driver.h>
#include "mlx5_core.h"
#include "thermal.h"
#define MLX5_THERMAL_POLL_INT_MSEC 1000
#define MLX5_THERMAL_NUM_TRIPS 0
#define MLX5_THERMAL_ASIC_SENSOR_INDEX 0
/* Bit string indicating the writeablility of trip points if any */
#define MLX5_THERMAL_TRIP_MASK (BIT(MLX5_THERMAL_NUM_TRIPS) - 1)
struct mlx5_thermal {
struct mlx5_core_dev *mdev;
struct thermal_zone_device *tzdev;
};
static int mlx5_thermal_get_mtmp_temp(struct mlx5_core_dev *mdev, u32 id, int *p_temp)
{
u32 mtmp_out[MLX5_ST_SZ_DW(mtmp_reg)] = {};
u32 mtmp_in[MLX5_ST_SZ_DW(mtmp_reg)] = {};
int err;
MLX5_SET(mtmp_reg, mtmp_in, sensor_index, id);
err = mlx5_core_access_reg(mdev, mtmp_in, sizeof(mtmp_in),
mtmp_out, sizeof(mtmp_out),
MLX5_REG_MTMP, 0, 0);
if (err)
return err;
*p_temp = MLX5_GET(mtmp_reg, mtmp_out, temperature);
return 0;
}
static int mlx5_thermal_get_temp(struct thermal_zone_device *tzdev,
int *p_temp)
{
struct mlx5_thermal *thermal = thermal_zone_device_priv(tzdev);
struct mlx5_core_dev *mdev = thermal->mdev;
int err;
err = mlx5_thermal_get_mtmp_temp(mdev, MLX5_THERMAL_ASIC_SENSOR_INDEX, p_temp);
if (err)
return err;
/* The unit of temp returned is in 0.125 C. The thermal
* framework expects the value in 0.001 C.
*/
*p_temp *= 125;
return 0;
}
static struct thermal_zone_device_ops mlx5_thermal_ops = {
.get_temp = mlx5_thermal_get_temp,
};
int mlx5_thermal_init(struct mlx5_core_dev *mdev)
{
struct mlx5_thermal *thermal;
struct thermal_zone_device *tzd;
const char *data = "mlx5";
tzd = thermal_zone_get_zone_by_name(data);
if (!IS_ERR(tzd))
return 0;
thermal = kzalloc(sizeof(*thermal), GFP_KERNEL);
if (!thermal)
return -ENOMEM;
thermal->mdev = mdev;
thermal->tzdev = thermal_zone_device_register_with_trips(data,
NULL,
MLX5_THERMAL_NUM_TRIPS,
MLX5_THERMAL_TRIP_MASK,
thermal,
&mlx5_thermal_ops,
NULL, 0, MLX5_THERMAL_POLL_INT_MSEC);
if (IS_ERR(thermal->tzdev)) {
dev_err(mdev->device, "Failed to register thermal zone device (%s) %ld\n",
data, PTR_ERR(thermal->tzdev));
kfree(thermal);
return -EINVAL;
}
mdev->thermal = thermal;
return 0;
}
void mlx5_thermal_uninit(struct mlx5_core_dev *mdev)
{
if (!mdev->thermal)
return;
thermal_zone_device_unregister(mdev->thermal->tzdev);
kfree(mdev->thermal);
}
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