diff mbox series

[v2,4/4] ACPI: processor: thermal: Update CPU cooling devices on cpufreq policy changes

Message ID 2893417.e9J7NaK4W3@kreacher
State New
Headers
Series thermal: core/ACPI: Fix processor cooling device regression |

Commit Message

Rafael J. Wysocki March 13, 2023, 2:34 p.m. UTC 
  From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

When a cpufreq policy appears or goes away, the CPU cooling devices for
the CPUs covered by that policy need to be updated so that the new
processor_get_max_state() value is stored as max_state and the
statistics in sysfs are rearranged for each of them.

Do that accordingly in acpi_thermal_cpufreq_init() and
acpi_thermal_cpufreq_exit().

Fixes: a365105c685c("thermal: sysfs: Reuse cdev->max_state")
Reported-by: Wang, Quanxian <quanxian.wang@intel.com>
Link: https://lore.kernel.org/linux-pm/53ec1f06f61c984100868926f282647e57ecfb2d.camel@intel.com/
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

v1 -> v2: Remove the now redundant IS_ERR() checks on cdev before calling
          thermal_cooling_device_update().

---
 drivers/acpi/processor_thermal.c |   14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

Comments

Zhang, Rui March 14, 2023, 2:03 a.m. UTC | #1 
On Mon, 2023-03-13 at 15:34 +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> When a cpufreq policy appears or goes away, the CPU cooling devices
> for
> the CPUs covered by that policy need to be updated so that the new
> processor_get_max_state() value is stored as max_state and the
> statistics in sysfs are rearranged for each of them.
> 
> Do that accordingly in acpi_thermal_cpufreq_init() and
> acpi_thermal_cpufreq_exit().
> 
> Fixes: a365105c685c("thermal: sysfs: Reuse cdev->max_state")
> Reported-by: Wang, Quanxian <quanxian.wang@intel.com>
> Link: 
> https://lore.kernel.org/linux-pm/53ec1f06f61c984100868926f282647e57ecfb2d.camel@intel.com/
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Tested-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>

thanks,
rui

> ---
> 
> v1 -> v2: Remove the now redundant IS_ERR() checks on cdev before
> calling
>           thermal_cooling_device_update().
> 
> ---
>  drivers/acpi/processor_thermal.c |   14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> Index: linux-pm/drivers/acpi/processor_thermal.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/processor_thermal.c
> +++ linux-pm/drivers/acpi/processor_thermal.c
> @@ -140,9 +140,13 @@ void acpi_thermal_cpufreq_init(struct cp
>  		ret = freq_qos_add_request(&policy->constraints,
>  					   &pr->thermal_req,
>  					   FREQ_QOS_MAX, INT_MAX);
> -		if (ret < 0)
> +		if (ret < 0) {
>  			pr_err("Failed to add freq constraint for CPU%d
> (%d)\n",
>  			       cpu, ret);
> +			continue;
> +		}
> +
> +		thermal_cooling_device_update(pr->cdev);
>  	}
>  }
>  
> @@ -153,8 +157,12 @@ void acpi_thermal_cpufreq_exit(struct cp
>  	for_each_cpu(cpu, policy->related_cpus) {
>  		struct acpi_processor *pr = per_cpu(processors, cpu);
>  
> -		if (pr)
> -			freq_qos_remove_request(&pr->thermal_req);
> +		if (!pr)
> +			continue;
> +
> +		freq_qos_remove_request(&pr->thermal_req);
> +
> +		thermal_cooling_device_update(pr->cdev);
>  	}
>  }
>  #else				/* ! CONFIG_CPU_FREQ */
> 
> 
>
diff mbox series

Patch

Index: linux-pm/drivers/acpi/processor_thermal.c
===================================================================
--- linux-pm.orig/drivers/acpi/processor_thermal.c
+++ linux-pm/drivers/acpi/processor_thermal.c
@@ -140,9 +140,13 @@  void acpi_thermal_cpufreq_init(struct cp
 		ret = freq_qos_add_request(&policy->constraints,
 					   &pr->thermal_req,
 					   FREQ_QOS_MAX, INT_MAX);
-		if (ret < 0)
+		if (ret < 0) {
 			pr_err("Failed to add freq constraint for CPU%d (%d)\n",
 			       cpu, ret);
+			continue;
+		}
+
+		thermal_cooling_device_update(pr->cdev);
 	}
 }
 
@@ -153,8 +157,12 @@  void acpi_thermal_cpufreq_exit(struct cp
 	for_each_cpu(cpu, policy->related_cpus) {
 		struct acpi_processor *pr = per_cpu(processors, cpu);
 
-		if (pr)
-			freq_qos_remove_request(&pr->thermal_req);
+		if (!pr)
+			continue;
+
+		freq_qos_remove_request(&pr->thermal_req);
+
+		thermal_cooling_device_update(pr->cdev);
 	}
 }
 #else				/* ! CONFIG_CPU_FREQ */