linux-kernel - [PATCH 1/2] thermal: intel: Allow processing of HWP interrupt

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Date:   Thu, 19 Aug 2021 19:40:05 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     rui.zhang@...el.com, daniel.lezcano@...aro.org, rjw@...ysocki.net,
        viresh.kumar@...aro.org, lenb@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH 1/2] thermal: intel: Allow processing of HWP interrupt

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@...ux.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