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Diffstat (limited to 'drivers/thermal/intel/intel_tcc.c')
-rw-r--r--drivers/thermal/intel/intel_tcc.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/drivers/thermal/intel/intel_tcc.c b/drivers/thermal/intel/intel_tcc.c
new file mode 100644
index 0000000000..2e5c741c41
--- /dev/null
+++ b/drivers/thermal/intel/intel_tcc.c
@@ -0,0 +1,139 @@
+// 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/msr.h>
+
+/**
+ * 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) & 0x3f;
+}
+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 (offset < 0 || offset > 0x3f)
+ 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 &= ~(0x3f << 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.
+ * @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.
+ */
+int intel_tcc_get_temp(int cpu, bool pkg)
+{
+ u32 low, high;
+ u32 msr = pkg ? MSR_IA32_PACKAGE_THERM_STATUS : MSR_IA32_THERM_STATUS;
+ int tjmax, temp, 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;
+
+ temp = tjmax - ((low >> 16) & 0x7f);
+
+ /* Do not allow negative CPU temperature */
+ return temp >= 0 ? temp : -ENODATA;
+}
+EXPORT_SYMBOL_NS_GPL(intel_tcc_get_temp, INTEL_TCC);