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Subject[PATCH 1/2] thermal: intel: Allow processing of HWP interrupt
Date
Add a weak function to process HWP (Hardware P-states) notifications and
move updating HWP_STATUS MSR to this function.

This allows HWP interrupts to be processed by the intel_pstate driver in
HWP mode by overriding the implementation.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
drivers/thermal/intel/therm_throt.c | 7 ++++++-
drivers/thermal/intel/thermal_interrupt.h | 3 +++
2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/thermal/intel/therm_throt.c b/drivers/thermal/intel/therm_throt.c
index 99abdc03c44c..dab7e8fb1059 100644
--- a/drivers/thermal/intel/therm_throt.c
+++ b/drivers/thermal/intel/therm_throt.c
@@ -569,13 +569,18 @@ static void notify_thresholds(__u64 msr_val)
platform_thermal_notify(msr_val);
}

+void __weak notify_hwp_interrupt(void)
+{
+ wrmsrl_safe(MSR_HWP_STATUS, 0);
+}
+
/* Thermal transition interrupt handler */
void intel_thermal_interrupt(void)
{
__u64 msr_val;

if (static_cpu_has(X86_FEATURE_HWP))
- wrmsrl_safe(MSR_HWP_STATUS, 0);
+ notify_hwp_interrupt();

rdmsrl(MSR_IA32_THERM_STATUS, msr_val);

diff --git a/drivers/thermal/intel/thermal_interrupt.h b/drivers/thermal/intel/thermal_interrupt.h
index 53f427bb58dc..01e7bed2ffc7 100644
--- a/drivers/thermal/intel/thermal_interrupt.h
+++ b/drivers/thermal/intel/thermal_interrupt.h
@@ -12,4 +12,7 @@ extern int (*platform_thermal_notify)(__u64 msr_val);
* callback has rate control */
extern bool (*platform_thermal_package_rate_control)(void);

+/* Handle HWP interrupt */
+extern void notify_hwp_interrupt(void);
+
#endif /* _INTEL_THERMAL_INTERRUPT_H */
--
2.31.1
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