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linux/drivers/thermal/intel/intel_tcc.c
Ricardo Neri 6ae0092ca7 thermal: intel: intel_tcc: Add model checks for temperature registers 
The register MSR_TEMPERATURE_TARGET is not architectural. Its fields may be
defined differently for each processor model. TCC_OFFSET is an example of
such case.

Despite being specified as architectural, the registers IA32_[PACKAGE]_
THERM_STATUS have become model-specific: in recent processors, the
digital temperature readout uses bits [23:16] whereas the Intel Software
Developer's manual specifies bits [22:16].

Create an array of processor models and their bitmasks for TCC_OFFSET and
the digital temperature readout fields. Do not include recent processors.
Instead, use the bitmasks of these recent processors as default.

Use these model-specific bitmasks when reading TCC_OFFSET or the
temperature sensors.

Initialize a model-specific data structure during subsys_initcall() to
have it ready when thermal drivers are loaded.

Expose the new interface intel_tcc_get_offset_mask(). The
intel_tcc_cooling driver will use it.

Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Link: https://patch.msgid.link/20240614211606.5896-2-ricardo.neri-calderon@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2024-06-21 14:52:12 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* intel_tcc.c - Library for Intel TCC (thermal control circuitry) MSR access
* Copyright (c) 2022, Intel Corporation.
*/
#include <linux/errno.h>
#include <linux/intel_tcc.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <asm/msr.h>
/**
* struct temp_masks - Bitmasks for temperature readings
* @tcc_offset: TCC offset in MSR_TEMPERATURE_TARGET
* @digital_readout: Digital readout in MSR_IA32_THERM_STATUS
* @pkg_digital_readout: Digital readout in MSR_IA32_PACKAGE_THERM_STATUS
*
* Bitmasks to extract the fields of the MSR_TEMPERATURE and IA32_[PACKAGE]_
* THERM_STATUS registers for different processor models.
*
* The bitmask of TjMax is not included in this structure. It is always 0xff.
*/
struct temp_masks {
u32 tcc_offset;
u32 digital_readout;
u32 pkg_digital_readout;
};
#define TCC_MODEL_TEMP_MASKS(model, _tcc_offset, _digital_readout, \
_pkg_digital_readout) \
static const struct temp_masks temp_##model __initconst = { \
.tcc_offset = _tcc_offset, \
.digital_readout = _digital_readout, \
.pkg_digital_readout = _pkg_digital_readout \
}
TCC_MODEL_TEMP_MASKS(nehalem, 0, 0x7f, 0x7f);
TCC_MODEL_TEMP_MASKS(haswell_x, 0xf, 0x7f, 0x7f);
TCC_MODEL_TEMP_MASKS(broadwell, 0x3f, 0x7f, 0x7f);
TCC_MODEL_TEMP_MASKS(goldmont, 0x7f, 0x7f, 0x7f);
TCC_MODEL_TEMP_MASKS(tigerlake, 0x3f, 0xff, 0xff);
TCC_MODEL_TEMP_MASKS(sapphirerapids, 0x3f, 0x7f, 0xff);
/* Use these masks for processors not included in @tcc_cpu_ids. */
static struct temp_masks intel_tcc_temp_masks __ro_after_init = {
.tcc_offset = 0x7f,
.digital_readout = 0xff,
.pkg_digital_readout = 0xff,
};
static const struct x86_cpu_id intel_tcc_cpu_ids[] __initconst = {
X86_MATCH_VFM(INTEL_CORE_YONAH, &temp_nehalem),
X86_MATCH_VFM(INTEL_CORE2_MEROM, &temp_nehalem),
X86_MATCH_VFM(INTEL_CORE2_MEROM_L, &temp_nehalem),
X86_MATCH_VFM(INTEL_CORE2_PENRYN, &temp_nehalem),
X86_MATCH_VFM(INTEL_CORE2_DUNNINGTON, &temp_nehalem),
X86_MATCH_VFM(INTEL_NEHALEM, &temp_nehalem),
X86_MATCH_VFM(INTEL_NEHALEM_G, &temp_nehalem),
X86_MATCH_VFM(INTEL_NEHALEM_EP, &temp_nehalem),
X86_MATCH_VFM(INTEL_NEHALEM_EX, &temp_nehalem),
X86_MATCH_VFM(INTEL_WESTMERE, &temp_nehalem),
X86_MATCH_VFM(INTEL_WESTMERE_EP, &temp_nehalem),
X86_MATCH_VFM(INTEL_WESTMERE_EX, &temp_nehalem),
X86_MATCH_VFM(INTEL_SANDYBRIDGE, &temp_nehalem),
X86_MATCH_VFM(INTEL_SANDYBRIDGE_X, &temp_nehalem),
X86_MATCH_VFM(INTEL_IVYBRIDGE, &temp_nehalem),
X86_MATCH_VFM(INTEL_IVYBRIDGE_X, &temp_haswell_x),
X86_MATCH_VFM(INTEL_HASWELL, &temp_nehalem),
X86_MATCH_VFM(INTEL_HASWELL_X, &temp_haswell_x),
X86_MATCH_VFM(INTEL_HASWELL_L, &temp_nehalem),
X86_MATCH_VFM(INTEL_HASWELL_G, &temp_nehalem),
X86_MATCH_VFM(INTEL_BROADWELL, &temp_broadwell),
X86_MATCH_VFM(INTEL_BROADWELL_G, &temp_broadwell),
X86_MATCH_VFM(INTEL_BROADWELL_X, &temp_haswell_x),
X86_MATCH_VFM(INTEL_BROADWELL_D, &temp_haswell_x),
X86_MATCH_VFM(INTEL_SKYLAKE_L, &temp_broadwell),
X86_MATCH_VFM(INTEL_SKYLAKE, &temp_broadwell),
X86_MATCH_VFM(INTEL_SKYLAKE_X, &temp_haswell_x),
X86_MATCH_VFM(INTEL_KABYLAKE_L, &temp_broadwell),
X86_MATCH_VFM(INTEL_KABYLAKE, &temp_broadwell),
X86_MATCH_VFM(INTEL_COMETLAKE, &temp_broadwell),
X86_MATCH_VFM(INTEL_COMETLAKE_L, &temp_broadwell),
X86_MATCH_VFM(INTEL_CANNONLAKE_L, &temp_broadwell),
X86_MATCH_VFM(INTEL_ICELAKE_X, &temp_broadwell),
X86_MATCH_VFM(INTEL_ICELAKE_D, &temp_broadwell),
X86_MATCH_VFM(INTEL_ICELAKE, &temp_broadwell),
X86_MATCH_VFM(INTEL_ICELAKE_L, &temp_broadwell),
X86_MATCH_VFM(INTEL_ICELAKE_NNPI, &temp_broadwell),
X86_MATCH_VFM(INTEL_ROCKETLAKE, &temp_broadwell),
X86_MATCH_VFM(INTEL_TIGERLAKE_L, &temp_tigerlake),
X86_MATCH_VFM(INTEL_TIGERLAKE, &temp_tigerlake),
X86_MATCH_VFM(INTEL_SAPPHIRERAPIDS_X, &temp_sapphirerapids),
X86_MATCH_VFM(INTEL_EMERALDRAPIDS_X, &temp_sapphirerapids),
X86_MATCH_VFM(INTEL_LAKEFIELD, &temp_broadwell),
X86_MATCH_VFM(INTEL_ALDERLAKE, &temp_tigerlake),
X86_MATCH_VFM(INTEL_ALDERLAKE_L, &temp_tigerlake),
X86_MATCH_VFM(INTEL_RAPTORLAKE, &temp_tigerlake),
X86_MATCH_VFM(INTEL_RAPTORLAKE_P, &temp_tigerlake),
X86_MATCH_VFM(INTEL_RAPTORLAKE_S, &temp_tigerlake),
X86_MATCH_VFM(INTEL_ATOM_BONNELL, &temp_nehalem),
X86_MATCH_VFM(INTEL_ATOM_BONNELL_MID, &temp_nehalem),
X86_MATCH_VFM(INTEL_ATOM_SALTWELL, &temp_nehalem),
X86_MATCH_VFM(INTEL_ATOM_SALTWELL_MID, &temp_nehalem),
X86_MATCH_VFM(INTEL_ATOM_SILVERMONT, &temp_broadwell),
X86_MATCH_VFM(INTEL_ATOM_SILVERMONT_D, &temp_broadwell),
X86_MATCH_VFM(INTEL_ATOM_SILVERMONT_MID, &temp_broadwell),
X86_MATCH_VFM(INTEL_ATOM_AIRMONT, &temp_broadwell),
X86_MATCH_VFM(INTEL_ATOM_AIRMONT_MID, &temp_broadwell),
X86_MATCH_VFM(INTEL_ATOM_AIRMONT_NP, &temp_broadwell),
X86_MATCH_VFM(INTEL_ATOM_GOLDMONT, &temp_goldmont),
X86_MATCH_VFM(INTEL_ATOM_GOLDMONT_D, &temp_goldmont),
X86_MATCH_VFM(INTEL_ATOM_GOLDMONT_PLUS, &temp_goldmont),
X86_MATCH_VFM(INTEL_ATOM_TREMONT_D, &temp_broadwell),
X86_MATCH_VFM(INTEL_ATOM_TREMONT, &temp_broadwell),
X86_MATCH_VFM(INTEL_ATOM_TREMONT_L, &temp_broadwell),
X86_MATCH_VFM(INTEL_ATOM_GRACEMONT, &temp_tigerlake),
X86_MATCH_VFM(INTEL_XEON_PHI_KNL, &temp_broadwell),
X86_MATCH_VFM(INTEL_XEON_PHI_KNM, &temp_broadwell),
{}
};
static int __init intel_tcc_init(void)
{
const struct x86_cpu_id *id;
id = x86_match_cpu(intel_tcc_cpu_ids);
if (id)
memcpy(&intel_tcc_temp_masks, (const void *)id->driver_data,
sizeof(intel_tcc_temp_masks));
return 0;
}
/*
* Use subsys_initcall to ensure temperature bitmasks are initialized before
* the drivers that use this library.
*/
subsys_initcall(intel_tcc_init);
/**
* intel_tcc_get_offset_mask() - Returns the bitmask to read TCC offset
*
* Get the model-specific bitmask to extract TCC_OFFSET from the MSR
* TEMPERATURE_TARGET register. If the mask is 0, it means the processor does
* not support TCC offset.
*
* Return: The model-specific bitmask for TCC offset.
*/
u32 intel_tcc_get_offset_mask(void)
{
return intel_tcc_temp_masks.tcc_offset;
}
EXPORT_SYMBOL_NS(intel_tcc_get_offset_mask, INTEL_TCC);
/**
* get_temp_mask() - Returns the model-specific bitmask for temperature
*
* @pkg: true: Package Thermal Sensor. false: Core Thermal Sensor.
*
* Get the model-specific bitmask to extract the temperature reading from the
* MSR_IA32_[PACKAGE]_THERM_STATUS register.
*
* Callers must check if the thermal status registers are supported.
*
* Return: The model-specific bitmask for temperature reading
*/
static u32 get_temp_mask(bool pkg)
{
return pkg ? intel_tcc_temp_masks.pkg_digital_readout :
intel_tcc_temp_masks.digital_readout;
}
/**
* intel_tcc_get_tjmax() - returns the default TCC activation Temperature
* @cpu: cpu that the MSR should be run on, nagative value means any cpu.
*
* Get the TjMax value, which is the default thermal throttling or TCC
* activation temperature in degrees C.
*
* Return: Tjmax value in degrees C on success, negative error code otherwise.
*/
int intel_tcc_get_tjmax(int cpu)
{
u32 low, high;
int val, err;
if (cpu < 0)
err = rdmsr_safe(MSR_IA32_TEMPERATURE_TARGET, &low, &high);
else
err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &low, &high);
if (err)
return err;
val = (low >> 16) & 0xff;
return val ? val : -ENODATA;
}
EXPORT_SYMBOL_NS_GPL(intel_tcc_get_tjmax, INTEL_TCC);
/**
* intel_tcc_get_offset() - returns the TCC Offset value to Tjmax
* @cpu: cpu that the MSR should be run on, nagative value means any cpu.
*
* Get the TCC offset value to Tjmax. The effective thermal throttling or TCC
* activation temperature equals "Tjmax" - "TCC Offset", in degrees C.
*
* Return: Tcc offset value in degrees C on success, negative error code otherwise.
*/
int intel_tcc_get_offset(int cpu)
{
u32 low, high;
int err;
if (cpu < 0)
err = rdmsr_safe(MSR_IA32_TEMPERATURE_TARGET, &low, &high);
else
err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &low, &high);
if (err)
return err;
return (low >> 24) & intel_tcc_temp_masks.tcc_offset;
}
EXPORT_SYMBOL_NS_GPL(intel_tcc_get_offset, INTEL_TCC);
/**
* intel_tcc_set_offset() - set the TCC offset value to Tjmax
* @cpu: cpu that the MSR should be run on, nagative value means any cpu.
* @offset: TCC offset value in degree C
*
* Set the TCC Offset value to Tjmax. The effective thermal throttling or TCC
* activation temperature equals "Tjmax" - "TCC Offset", in degree C.
*
* Return: On success returns 0, negative error code otherwise.
*/
int intel_tcc_set_offset(int cpu, int offset)
{
u32 low, high;
int err;
if (!intel_tcc_temp_masks.tcc_offset)
return -ENODEV;
if (offset < 0 || offset > intel_tcc_temp_masks.tcc_offset)
return -EINVAL;
if (cpu < 0)
err = rdmsr_safe(MSR_IA32_TEMPERATURE_TARGET, &low, &high);
else
err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &low, &high);
if (err)
return err;
/* MSR Locked */
if (low & BIT(31))
return -EPERM;
low &= ~(intel_tcc_temp_masks.tcc_offset << 24);
low |= offset << 24;
if (cpu < 0)
return wrmsr_safe(MSR_IA32_TEMPERATURE_TARGET, low, high);
else
return wrmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, low, high);
}
EXPORT_SYMBOL_NS_GPL(intel_tcc_set_offset, INTEL_TCC);
/**
* intel_tcc_get_temp() - returns the current temperature
* @cpu: cpu that the MSR should be run on, nagative value means any cpu.
* @temp: pointer to the memory for saving cpu temperature.
* @pkg: true: Package Thermal Sensor. false: Core Thermal Sensor.
*
* Get the current temperature returned by the CPU core/package level
* thermal sensor, in degrees C.
*
* Return: 0 on success, negative error code otherwise.
*/
int intel_tcc_get_temp(int cpu, int *temp, bool pkg)
{
u32 msr = pkg ? MSR_IA32_PACKAGE_THERM_STATUS : MSR_IA32_THERM_STATUS;
u32 low, high, mask;
int tjmax, err;
tjmax = intel_tcc_get_tjmax(cpu);
if (tjmax < 0)
return tjmax;
if (cpu < 0)
err = rdmsr_safe(msr, &low, &high);
else
err = rdmsr_safe_on_cpu(cpu, msr, &low, &high);
if (err)
return err;
/* Temperature is beyond the valid thermal sensor range */
if (!(low & BIT(31)))
return -ENODATA;
mask = get_temp_mask(pkg);
*temp = tjmax - ((low >> 16) & mask);
return 0;
}
EXPORT_SYMBOL_NS_GPL(intel_tcc_get_temp, INTEL_TCC);
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