1 // SPDX-License-Identifier: GPL-2.0-only
3  * intel_tcc.c - Library for Intel TCC (thermal control circuitry) MSR access
12  * intel_tcc_get_tjmax() - returns the default TCC activation Temperature
13  * @cpu: cpu that the MSR should be run on, nagative value means any cpu.
20 int intel_tcc_get_tjmax(int cpu)  in intel_tcc_get_tjmax()  argument
25 	if (cpu < 0)  in intel_tcc_get_tjmax()
28 		err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &low, &high);  in intel_tcc_get_tjmax()
34 	return val ? val : -ENODATA;  in intel_tcc_get_tjmax()
39  * intel_tcc_get_offset() - returns the TCC Offset value to Tjmax
40  * @cpu: cpu that the MSR should be run on, nagative value means any cpu.
42  * Get the TCC offset value to Tjmax. The effective thermal throttling or TCC
43  * activation temperature equals "Tjmax" - "TCC Offset", in degrees C.
45  * Return: Tcc offset value in degrees C on success, negative error code otherwise.
47 int intel_tcc_get_offset(int cpu)  in intel_tcc_get_offset()  argument
52 	if (cpu < 0)  in intel_tcc_get_offset()
55 		err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &low, &high);  in intel_tcc_get_offset()
64  * intel_tcc_set_offset() - set the TCC offset value to Tjmax
65  * @cpu: cpu that the MSR should be run on, nagative value means any cpu.
66  * @offset: TCC offset value in degree C
68  * Set the TCC Offset value to Tjmax. The effective thermal throttling or TCC
69  * activation temperature equals "Tjmax" - "TCC Offset", in degree C.
74 int intel_tcc_set_offset(int cpu, int offset)  in intel_tcc_set_offset()  argument
79 	if (offset < 0 || offset > 0x3f)  in intel_tcc_set_offset()
80 		return -EINVAL;  in intel_tcc_set_offset()
82 	if (cpu < 0)  in intel_tcc_set_offset()
85 		err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &low, &high);  in intel_tcc_set_offset()
91 		return -EPERM;  in intel_tcc_set_offset()
94 	low |= offset << 24;  in intel_tcc_set_offset()
96 	if (cpu < 0)  in intel_tcc_set_offset()
99 		return wrmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, low, high);  in intel_tcc_set_offset()
104  * intel_tcc_get_temp() - returns the current temperature
105  * @cpu: cpu that the MSR should be run on, nagative value means any cpu.
108  * Get the current temperature returned by the CPU core/package level
113 int intel_tcc_get_temp(int cpu, bool pkg)  in intel_tcc_get_temp()  argument
119 	tjmax = intel_tcc_get_tjmax(cpu);  in intel_tcc_get_temp()
123 	if (cpu < 0)  in intel_tcc_get_temp()
126 		err = rdmsr_safe_on_cpu(cpu, msr, &low, &high);  in intel_tcc_get_temp()
132 		return -ENODATA;  in intel_tcc_get_temp()
134 	temp = tjmax - ((low >> 16) & 0x7f);  in intel_tcc_get_temp()
136 	/* Do not allow negative CPU temperature */  in intel_tcc_get_temp()
137 	return temp >= 0 ? temp : -ENODATA;  in intel_tcc_get_temp()