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thermal/intel: Fix intel_tcc_get_temp() to support negative CPU temperature 

[ Upstream commit 7251b9e8a007ddd834aa81f8c7ea338884629fec ]

CPU temperature can be negative in some cases. Thus the negative CPU
temperature should not be considered as a failure.

Fix intel_tcc_get_temp() and its users to support negative CPU
temperature.

Fixes: a3c1f066e1 ("thermal/intel: Introduce Intel TCC library")
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Cc: 6.3+ <stable@vger.kernel.org> # 6.3+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhang Rui 2024-02-06 09:54:09 +08:00 committed by Greg Kroah-Hartman
parent 868e3264f2
commit 9df6a7a3c9
4 changed files with 15 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
View File

@ -113,14 +113,14 @@ static int proc_thermal_get_zone_temp(struct thermal_zone_device *zone,
int *temp)
{
int cpu;
int curr_temp;
int curr_temp, ret;
*temp = 0;
for_each_online_cpu(cpu) {
curr_temp = intel_tcc_get_temp(cpu, false);
if (curr_temp < 0)
return curr_temp;
ret = intel_tcc_get_temp(cpu, &curr_temp, false);
if (ret < 0)
return ret;
if (!*temp || curr_temp > *temp)
*temp = curr_temp;
}

12
drivers/thermal/intel/intel_tcc.c
View File

@ -103,18 +103,19 @@ 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: Temperature in degrees C on success, negative error code otherwise.
* Return: 0 on success, negative error code otherwise.
*/
int intel_tcc_get_temp(int cpu, bool pkg)
int intel_tcc_get_temp(int cpu, int *temp, bool pkg)
{
u32 low, high;
u32 msr = pkg ? MSR_IA32_PACKAGE_THERM_STATUS : MSR_IA32_THERM_STATUS;
int tjmax, temp, err;
int tjmax, err;
tjmax = intel_tcc_get_tjmax(cpu);
if (tjmax < 0)
@ -131,9 +132,8 @@ int intel_tcc_get_temp(int cpu, bool pkg)
if (!(low & BIT(31)))
return -ENODATA;
temp = tjmax - ((low >> 16) & 0x7f);
*temp = tjmax - ((low >> 16) & 0x7f);
/* Do not allow negative CPU temperature */
return temp >= 0 ? temp : -ENODATA;
return 0;
}
EXPORT_SYMBOL_NS_GPL(intel_tcc_get_temp, INTEL_TCC);

8
drivers/thermal/intel/x86_pkg_temp_thermal.c
View File

@ -108,11 +108,11 @@ static struct zone_device *pkg_temp_thermal_get_dev(unsigned int cpu)
static int sys_get_curr_temp(struct thermal_zone_device *tzd, int *temp)
{
struct zone_device *zonedev = thermal_zone_device_priv(tzd);
int val;
int val, ret;
val = intel_tcc_get_temp(zonedev->cpu, true);
if (val < 0)
return val;
ret = intel_tcc_get_temp(zonedev->cpu, &val, true);
if (ret < 0)
return ret;
*temp = val * 1000;
pr_debug("sys_get_curr_temp %d\n", *temp);

2
include/linux/intel_tcc.h
View File

@ -13,6 +13,6 @@
int intel_tcc_get_tjmax(int cpu);
int intel_tcc_get_offset(int cpu);
int intel_tcc_set_offset(int cpu, int offset);
int intel_tcc_get_temp(int cpu, bool pkg);
int intel_tcc_get_temp(int cpu, int *temp, bool pkg);
#endif /* __INTEL_TCC_H__ */