ACPI: processor: Split out thermal initialization from ACPI PSS

Commit 239708a3af44 ("ACPI: Split out ACPI PSS from ACPI Processor
driver"), moves processor thermal registration to acpi_pss_perf_init(),
which doesn't get executed if ACPI_CPU_FREQ_PSS is not enabled.

As ARM64 supports P-states using CPPC, it should be possible to also
support processor passive cooling even if PSS is not enabled. Split
out the processor thermal cooling register from ACPI PSS to support
this, and move it into a separate function in processor_thermal.c.

Signed-off-by: Riwen Lu <luriwen@kylinos.cn>
Reviewed-by: Punit Agrawal <punit.agrawal@bytedance.com>
[ rjw: Subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 1e34f84..2457ade 100644 (file)
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -255,7 +255,6 @@ config ACPI_DOCK
 
 config ACPI_CPU_FREQ_PSS
        bool
-       select THERMAL
 
 config ACPI_PROCESSOR_CSTATE
        def_bool y
@@ -287,6 +286,7 @@ config ACPI_PROCESSOR
        depends on X86 || IA64 || ARM64 || LOONGARCH
        select ACPI_PROCESSOR_IDLE
        select ACPI_CPU_FREQ_PSS if X86 || IA64 || LOONGARCH
+       select THERMAL
        default y
        help
          This driver adds support for the ACPI Processor package. It is required

diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index b5a8d3e..0002eec 100644 (file)
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -109,10 +109,9 @@ obj-$(CONFIG_ACPI_PPTT)    += pptt.o
 obj-$(CONFIG_ACPI_PFRUT)       += pfr_update.o pfr_telemetry.o
 
 # processor has its own "processor." module_param namespace
-processor-y                    := processor_driver.o
+processor-y                    := processor_driver.o processor_thermal.o
 processor-$(CONFIG_ACPI_PROCESSOR_IDLE) += processor_idle.o
-processor-$(CONFIG_ACPI_CPU_FREQ_PSS)  += processor_throttling.o       \
-       processor_thermal.o
+processor-$(CONFIG_ACPI_CPU_FREQ_PSS)  += processor_throttling.o
 processor-$(CONFIG_CPU_FREQ)   += processor_perflib.o
 
 obj-$(CONFIG_ACPI_PROCESSOR_AGGREGATOR) += acpi_pad.o

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 368a9ed..1278969 100644 (file)
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -139,75 +139,17 @@ static int acpi_soft_cpu_dead(unsigned int cpu)
 }
 
 #ifdef CONFIG_ACPI_CPU_FREQ_PSS
-static int acpi_pss_perf_init(struct acpi_processor *pr,
-               struct acpi_device *device)
+static void acpi_pss_perf_init(struct acpi_processor *pr)
 {
-       int result = 0;
-
        acpi_processor_ppc_has_changed(pr, 0);
 
        acpi_processor_get_throttling_info(pr);
 
        if (pr->flags.throttling)
                pr->flags.limit = 1;
-
-       pr->cdev = thermal_cooling_device_register("Processor", device,
-                                                  &processor_cooling_ops);
-       if (IS_ERR(pr->cdev)) {
-               result = PTR_ERR(pr->cdev);
-               return result;
-       }
-
-       dev_dbg(&device->dev, "registered as cooling_device%d\n",
-               pr->cdev->id);
-
-       result = sysfs_create_link(&device->dev.kobj,
-                                  &pr->cdev->device.kobj,
-                                  "thermal_cooling");
-       if (result) {
-               dev_err(&device->dev,
-                       "Failed to create sysfs link 'thermal_cooling'\n");
-               goto err_thermal_unregister;
-       }
-
-       result = sysfs_create_link(&pr->cdev->device.kobj,
-                                  &device->dev.kobj,
-                                  "device");
-       if (result) {
-               dev_err(&pr->cdev->device,
-                       "Failed to create sysfs link 'device'\n");
-               goto err_remove_sysfs_thermal;
-       }
-
-       return 0;
-
- err_remove_sysfs_thermal:
-       sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
- err_thermal_unregister:
-       thermal_cooling_device_unregister(pr->cdev);
-
-       return result;
-}
-
-static void acpi_pss_perf_exit(struct acpi_processor *pr,
-               struct acpi_device *device)
-{
-       if (pr->cdev) {
-               sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
-               sysfs_remove_link(&pr->cdev->device.kobj, "device");
-               thermal_cooling_device_unregister(pr->cdev);
-               pr->cdev = NULL;
-       }
 }
 #else
-static inline int acpi_pss_perf_init(struct acpi_processor *pr,
-               struct acpi_device *device)
-{
-       return 0;
-}
-
-static inline void acpi_pss_perf_exit(struct acpi_processor *pr,
-               struct acpi_device *device) {}
+static inline void acpi_pss_perf_init(struct acpi_processor *pr) {}
 #endif /* CONFIG_ACPI_CPU_FREQ_PSS */
 
 static int __acpi_processor_start(struct acpi_device *device)
@@ -229,7 +171,9 @@ static int __acpi_processor_start(struct acpi_device *device)
        if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
                acpi_processor_power_init(pr);
 
-       result = acpi_pss_perf_init(pr, device);
+       acpi_pss_perf_init(pr);
+
+       result = acpi_processor_thermal_init(pr, device);
        if (result)
                goto err_power_exit;
 
@@ -239,7 +183,7 @@ static int __acpi_processor_start(struct acpi_device *device)
                return 0;
 
        result = -ENODEV;
-       acpi_pss_perf_exit(pr, device);
+       acpi_processor_thermal_exit(pr, device);
 
 err_power_exit:
        acpi_processor_power_exit(pr);
@@ -277,10 +221,10 @@ static int acpi_processor_stop(struct device *dev)
                return 0;
        acpi_processor_power_exit(pr);
 
-       acpi_pss_perf_exit(pr, device);
-
        acpi_cppc_processor_exit(pr);
 
+       acpi_processor_thermal_exit(pr, device);
+
        return 0;
 }
 

diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c
index d8b2dfc..db6ac54 100644 (file)
--- a/drivers/acpi/processor_thermal.c
+++ b/drivers/acpi/processor_thermal.c
@@ -266,3 +266,57 @@ const struct thermal_cooling_device_ops processor_cooling_ops = {
        .get_cur_state = processor_get_cur_state,
        .set_cur_state = processor_set_cur_state,
 };
+
+int acpi_processor_thermal_init(struct acpi_processor *pr,
+                               struct acpi_device *device)
+{
+       int result = 0;
+
+       pr->cdev = thermal_cooling_device_register("Processor", device,
+                                                  &processor_cooling_ops);
+       if (IS_ERR(pr->cdev)) {
+               result = PTR_ERR(pr->cdev);
+               return result;
+       }
+
+       dev_dbg(&device->dev, "registered as cooling_device%d\n",
+               pr->cdev->id);
+
+       result = sysfs_create_link(&device->dev.kobj,
+                                  &pr->cdev->device.kobj,
+                                  "thermal_cooling");
+       if (result) {
+               dev_err(&device->dev,
+                       "Failed to create sysfs link 'thermal_cooling'\n");
+               goto err_thermal_unregister;
+       }
+
+       result = sysfs_create_link(&pr->cdev->device.kobj,
+                                  &device->dev.kobj,
+                                  "device");
+       if (result) {
+               dev_err(&pr->cdev->device,
+                       "Failed to create sysfs link 'device'\n");
+               goto err_remove_sysfs_thermal;
+       }
+
+       return 0;
+
+err_remove_sysfs_thermal:
+       sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
+err_thermal_unregister:
+       thermal_cooling_device_unregister(pr->cdev);
+
+       return result;
+}
+
+void acpi_processor_thermal_exit(struct acpi_processor *pr,
+                                struct acpi_device *device)
+{
+       if (pr->cdev) {
+               sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
+               sysfs_remove_link(&pr->cdev->device.kobj, "device");
+               thermal_cooling_device_unregister(pr->cdev);
+               pr->cdev = NULL;
+       }
+}

diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 1940273..ba1e3ed 100644 (file)
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -442,8 +442,12 @@ static inline int acpi_processor_hotplug(struct acpi_processor *pr)
 
 /* in processor_thermal.c */
 int acpi_processor_get_limit_info(struct acpi_processor *pr);
+int acpi_processor_thermal_init(struct acpi_processor *pr,
+                               struct acpi_device *device);
+void acpi_processor_thermal_exit(struct acpi_processor *pr,
+                                struct acpi_device *device);
 extern const struct thermal_cooling_device_ops processor_cooling_ops;
-#if defined(CONFIG_ACPI_CPU_FREQ_PSS) & defined(CONFIG_CPU_FREQ)
+#ifdef CONFIG_CPU_FREQ
 void acpi_thermal_cpufreq_init(struct cpufreq_policy *policy);
 void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy);
 #else
@@ -455,6 +459,6 @@ static inline void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy)
 {
        return;
 }
-#endif /* CONFIG_ACPI_CPU_FREQ_PSS */
+#endif /* CONFIG_CPU_FREQ */
 
 #endif