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// SPDX-License-Identifier: GPL-2.0-only
/*
* cooling device driver that activates the processor throttling by
* programming the TCC Offset register.
* Copyright (c) 2021, Intel Corporation.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/device.h>
#include <linux/module.h>
#include <linux/thermal.h>
#include <asm/cpu_device_id.h>
#define TCC_SHIFT 24
#define TCC_MASK (0x3fULL<<24)
#define TCC_PROGRAMMABLE BIT(30)
static struct thermal_cooling_device *tcc_cdev;
static int tcc_get_max_state(struct thermal_cooling_device *cdev, unsigned long
*state)
{
*state = TCC_MASK >> TCC_SHIFT;
return 0;
}
static int tcc_offset_update(int tcc)
{
u64 val;
int err;
err = rdmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, &val);
if (err)
return err;
val &= ~TCC_MASK;
val |= tcc << TCC_SHIFT;
err = wrmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, val);
if (err)
return err;
return 0;
}
static int tcc_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
*state)
{
u64 val;
int err;
err = rdmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, &val);
if (err)
return err;
*state = (val & TCC_MASK) >> TCC_SHIFT;
return 0;
}
static int tcc_set_cur_state(struct thermal_cooling_device *cdev, unsigned long
state)
{
return tcc_offset_update(state);
}
static const struct thermal_cooling_device_ops tcc_cooling_ops = {
.get_max_state = tcc_get_max_state,
.get_cur_state = tcc_get_cur_state,
.set_cur_state = tcc_set_cur_state,
};
static const struct x86_cpu_id tcc_ids[] __initconst = {
X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE, NULL),
X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L, NULL),
X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, NULL),
X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L, NULL),
X86_MATCH_INTEL_FAM6_MODEL(ICELAKE, NULL),
X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_L, NULL),
X86_MATCH_INTEL_FAM6_MODEL(TIGERLAKE, NULL),
X86_MATCH_INTEL_FAM6_MODEL(TIGERLAKE_L, NULL),
X86_MATCH_INTEL_FAM6_MODEL(COMETLAKE, NULL),
{}
};
MODULE_DEVICE_TABLE(x86cpu, tcc_ids);
static int __init tcc_cooling_init(void)
{
int ret;
u64 val;
const struct x86_cpu_id *id;
int err;
id = x86_match_cpu(tcc_ids);
if (!id)
return -ENODEV;
err = rdmsrl_safe(MSR_PLATFORM_INFO, &val);
if (err)
return err;
if (!(val & TCC_PROGRAMMABLE))
return -ENODEV;
pr_info("Programmable TCC Offset detected\n");
tcc_cdev =
thermal_cooling_device_register("TCC Offset", NULL,
&tcc_cooling_ops);
if (IS_ERR(tcc_cdev)) {
ret = PTR_ERR(tcc_cdev);
return ret;
}
return 0;
}
module_init(tcc_cooling_init)
static void __exit tcc_cooling_exit(void)
{
thermal_cooling_device_unregister(tcc_cdev);
}
module_exit(tcc_cooling_exit)
MODULE_DESCRIPTION("TCC offset cooling device Driver");
MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
MODULE_LICENSE("GPL v2");
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