| Message ID | 20241104222855.3959267-1-superm1@kernel.org (mailing list archive) |
|---|---|
| State | Queued |
| Delegated to: | Rafael Wysocki |
| Headers | show |
| Series | [v4] ACPI: processor: Move arch_init_invariance_cppc() call later | expand |
On Mon, Nov 4, 2024 at 11:29 PM Mario Limonciello <superm1@kernel.org> wrote: > > From: Mario Limonciello <mario.limonciello@amd.com> > > arch_init_invariance_cppc() is called at the end of > acpi_cppc_processor_probe() in order to configure frequency invariance > based upon the values from _CPC. > > This however doesn't work on AMD CPPC shared memory designs that have > AMD preferred cores enabled because _CPC needs to be analyzed from all > cores to judge if preferred cores are enabled. > > This issue manifests to users as a warning since commit 21fb59ab4b97 > ("ACPI: CPPC: Adjust debug messages in amd_set_max_freq_ratio() to warn"): > ``` > Could not retrieve highest performance (-19) > ``` > > However the warning isn't the cause of this, it was actually > commit 279f838a61f9 ("x86/amd: Detect preferred cores in > amd_get_boost_ratio_numerator()") which exposed the issue. > > To fix this problem, change arch_init_invariance_cppc() into a new weak > symbol that is called at the end of acpi_processor_driver_init(). > Each architecture that supports it can declare the symbol to override > the weak one. "Define it for x86, in arch/x86/kernel/acpi/cppc.c, and for all of the architectures using the generic arch_topology.c code." > Fixes: 279f838a61f9 ("x86/amd: Detect preferred cores in amd_get_boost_ratio_numerator()") > Reported-by: Ivan Shapovalov <intelfx@intelfx.name> > Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219431 > Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name> > Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> > --- > v4: > * Drop macros and only use symbols > v3: > * Weak symbol instead of macro to help riscv build failure > * Update commit message > * Add comment > --- > arch/arm64/include/asm/topology.h | 4 ---- > arch/x86/include/asm/topology.h | 5 ----- > arch/x86/kernel/acpi/cppc.c | 7 ++++++- > drivers/acpi/cppc_acpi.c | 6 ------ > drivers/acpi/processor_driver.c | 9 +++++++++ > drivers/base/arch_topology.c | 6 +++++- > include/acpi/processor.h | 2 ++ > include/linux/arch_topology.h | 4 ---- > 8 files changed, 22 insertions(+), 21 deletions(-) > > diff --git a/arch/arm64/include/asm/topology.h b/arch/arm64/include/asm/topology.h > index 5fc3af9f8f29b..341174bf91063 100644 > --- a/arch/arm64/include/asm/topology.h > +++ b/arch/arm64/include/asm/topology.h > @@ -26,10 +26,6 @@ void update_freq_counters_refs(void); > #define arch_scale_freq_invariant topology_scale_freq_invariant > #define arch_scale_freq_ref topology_get_freq_ref > > -#ifdef CONFIG_ACPI_CPPC_LIB > -#define arch_init_invariance_cppc topology_init_cpu_capacity_cppc > -#endif > - > /* Replace task scheduler's default cpu-invariant accounting */ > #define arch_scale_cpu_capacity topology_get_cpu_scale > > diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h > index aef70336d6247..92f3664dd933b 100644 > --- a/arch/x86/include/asm/topology.h > +++ b/arch/x86/include/asm/topology.h > @@ -305,9 +305,4 @@ static inline void freq_invariance_set_perf_ratio(u64 ratio, bool turbo_disabled > extern void arch_scale_freq_tick(void); > #define arch_scale_freq_tick arch_scale_freq_tick > > -#ifdef CONFIG_ACPI_CPPC_LIB > -void init_freq_invariance_cppc(void); > -#define arch_init_invariance_cppc init_freq_invariance_cppc > -#endif > - > #endif /* _ASM_X86_TOPOLOGY_H */ > diff --git a/arch/x86/kernel/acpi/cppc.c b/arch/x86/kernel/acpi/cppc.c > index 956984054bf30..aab9d0570841a 100644 > --- a/arch/x86/kernel/acpi/cppc.c > +++ b/arch/x86/kernel/acpi/cppc.c > @@ -110,7 +110,7 @@ static void amd_set_max_freq_ratio(void) > > static DEFINE_MUTEX(freq_invariance_lock); > > -void init_freq_invariance_cppc(void) > +static inline void init_freq_invariance_cppc(void) > { > static bool init_done; > > @@ -127,6 +127,11 @@ void init_freq_invariance_cppc(void) > mutex_unlock(&freq_invariance_lock); > } > > +void acpi_processor_init_invariance_cppc(void) > +{ > + init_freq_invariance_cppc(); > +} > + > /* > * Get the highest performance register value. > * @cpu: CPU from which to get highest performance. > diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c > index 1a40f0514eaa3..5c0cc7aae8726 100644 > --- a/drivers/acpi/cppc_acpi.c > +++ b/drivers/acpi/cppc_acpi.c > @@ -671,10 +671,6 @@ static int pcc_data_alloc(int pcc_ss_id) > * ) > */ > > -#ifndef arch_init_invariance_cppc > -static inline void arch_init_invariance_cppc(void) { } > -#endif > - > /** > * acpi_cppc_processor_probe - Search for per CPU _CPC objects. > * @pr: Ptr to acpi_processor containing this CPU's logical ID. > @@ -905,8 +901,6 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) > goto out_free; > } > > - arch_init_invariance_cppc(); > - > kfree(output.pointer); > return 0; > > diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c > index cb52dd000b958..3b281bc1e73c3 100644 > --- a/drivers/acpi/processor_driver.c > +++ b/drivers/acpi/processor_driver.c > @@ -237,6 +237,9 @@ static struct notifier_block acpi_processor_notifier_block = { > .notifier_call = acpi_processor_notifier, > }; > > +void __weak acpi_processor_init_invariance_cppc(void) > +{ } > + > /* > * We keep the driver loaded even when ACPI is not running. > * This is needed for the powernow-k8 driver, that works even without > @@ -270,6 +273,12 @@ static int __init acpi_processor_driver_init(void) > NULL, acpi_soft_cpu_dead); > > acpi_processor_throttling_init(); > + > + /* > + * Frequency invariance calculations on AMD platforms can't be run until > + * after acpi_cppc_processor_probe() has been called for all online CPUs > + */ > + acpi_processor_init_invariance_cppc(); > return 0; > err: > driver_unregister(&acpi_processor_driver); > diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c > index 75fcb75d55155..3ebe77566788b 100644 > --- a/drivers/base/arch_topology.c > +++ b/drivers/base/arch_topology.c > @@ -366,7 +366,7 @@ void __weak freq_inv_set_max_ratio(int cpu, u64 max_rate) > #ifdef CONFIG_ACPI_CPPC_LIB > #include <acpi/cppc_acpi.h> > > -void topology_init_cpu_capacity_cppc(void) > +static inline void topology_init_cpu_capacity_cppc(void) > { > u64 capacity, capacity_scale = 0; > struct cppc_perf_caps perf_caps; > @@ -417,6 +417,10 @@ void topology_init_cpu_capacity_cppc(void) > exit: > free_raw_capacity(); > } > +void acpi_processor_init_invariance_cppc(void) > +{ > + topology_init_cpu_capacity_cppc(); > +} > #endif > > #ifdef CONFIG_CPU_FREQ > diff --git a/include/acpi/processor.h b/include/acpi/processor.h > index e6f6074eadbf3..a17e97e634a68 100644 > --- a/include/acpi/processor.h > +++ b/include/acpi/processor.h > @@ -465,4 +465,6 @@ extern int acpi_processor_ffh_lpi_probe(unsigned int cpu); > extern int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi); > #endif > > +void acpi_processor_init_invariance_cppc(void); > + > #endif > diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h > index b721f360d7592..4a952c4885edc 100644 > --- a/include/linux/arch_topology.h > +++ b/include/linux/arch_topology.h > @@ -11,10 +11,6 @@ > void topology_normalize_cpu_scale(void); > int topology_update_cpu_topology(void); > > -#ifdef CONFIG_ACPI_CPPC_LIB > -void topology_init_cpu_capacity_cppc(void); > -#endif > - > struct device_node; > bool topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu); > > > base-commit: 6db936d4ac0fe281af48b4d1ebf69b1523bbac31 > -- > 2.43.0 >
On Tue, Nov 5, 2024 at 9:17 PM Rafael J. Wysocki <rafael@kernel.org> wrote: > > On Mon, Nov 4, 2024 at 11:29 PM Mario Limonciello <superm1@kernel.org> wrote: > > > > From: Mario Limonciello <mario.limonciello@amd.com> > > > > arch_init_invariance_cppc() is called at the end of > > acpi_cppc_processor_probe() in order to configure frequency invariance > > based upon the values from _CPC. > > > > This however doesn't work on AMD CPPC shared memory designs that have > > AMD preferred cores enabled because _CPC needs to be analyzed from all > > cores to judge if preferred cores are enabled. > > > > This issue manifests to users as a warning since commit 21fb59ab4b97 > > ("ACPI: CPPC: Adjust debug messages in amd_set_max_freq_ratio() to warn"): > > ``` > > Could not retrieve highest performance (-19) > > ``` > > > > However the warning isn't the cause of this, it was actually > > commit 279f838a61f9 ("x86/amd: Detect preferred cores in > > amd_get_boost_ratio_numerator()") which exposed the issue. > > > > To fix this problem, change arch_init_invariance_cppc() into a new weak > > symbol that is called at the end of acpi_processor_driver_init(). > > Each architecture that supports it can declare the symbol to override > > the weak one. > > "Define it for x86, in arch/x86/kernel/acpi/cppc.c, and for all of the > architectures using the generic arch_topology.c code." I've added this to the patch changelog and queued it up as a 6.12 fix. Thanks!
On 11/6/2024 14:33, Rafael J. Wysocki wrote: > On Tue, Nov 5, 2024 at 9:17 PM Rafael J. Wysocki <rafael@kernel.org> wrote: >> >> On Mon, Nov 4, 2024 at 11:29 PM Mario Limonciello <superm1@kernel.org> wrote: >>> >>> From: Mario Limonciello <mario.limonciello@amd.com> >>> >>> arch_init_invariance_cppc() is called at the end of >>> acpi_cppc_processor_probe() in order to configure frequency invariance >>> based upon the values from _CPC. >>> >>> This however doesn't work on AMD CPPC shared memory designs that have >>> AMD preferred cores enabled because _CPC needs to be analyzed from all >>> cores to judge if preferred cores are enabled. >>> >>> This issue manifests to users as a warning since commit 21fb59ab4b97 >>> ("ACPI: CPPC: Adjust debug messages in amd_set_max_freq_ratio() to warn"): >>> ``` >>> Could not retrieve highest performance (-19) >>> ``` >>> >>> However the warning isn't the cause of this, it was actually >>> commit 279f838a61f9 ("x86/amd: Detect preferred cores in >>> amd_get_boost_ratio_numerator()") which exposed the issue. >>> >>> To fix this problem, change arch_init_invariance_cppc() into a new weak >>> symbol that is called at the end of acpi_processor_driver_init(). >>> Each architecture that supports it can declare the symbol to override >>> the weak one. >> >> "Define it for x86, in arch/x86/kernel/acpi/cppc.c, and for all of the >> architectures using the generic arch_topology.c code." > > I've added this to the patch changelog and queued it up as a 6.12 fix. > > Thanks! Thanks!
diff --git a/arch/arm64/include/asm/topology.h b/arch/arm64/include/asm/topology.h index 5fc3af9f8f29b..341174bf91063 100644 --- a/arch/arm64/include/asm/topology.h +++ b/arch/arm64/include/asm/topology.h @@ -26,10 +26,6 @@ void update_freq_counters_refs(void); #define arch_scale_freq_invariant topology_scale_freq_invariant #define arch_scale_freq_ref topology_get_freq_ref -#ifdef CONFIG_ACPI_CPPC_LIB -#define arch_init_invariance_cppc topology_init_cpu_capacity_cppc -#endif - /* Replace task scheduler's default cpu-invariant accounting */ #define arch_scale_cpu_capacity topology_get_cpu_scale diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h index aef70336d6247..92f3664dd933b 100644 --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -305,9 +305,4 @@ static inline void freq_invariance_set_perf_ratio(u64 ratio, bool turbo_disabled extern void arch_scale_freq_tick(void); #define arch_scale_freq_tick arch_scale_freq_tick -#ifdef CONFIG_ACPI_CPPC_LIB -void init_freq_invariance_cppc(void); -#define arch_init_invariance_cppc init_freq_invariance_cppc -#endif - #endif /* _ASM_X86_TOPOLOGY_H */ diff --git a/arch/x86/kernel/acpi/cppc.c b/arch/x86/kernel/acpi/cppc.c index 956984054bf30..aab9d0570841a 100644 --- a/arch/x86/kernel/acpi/cppc.c +++ b/arch/x86/kernel/acpi/cppc.c @@ -110,7 +110,7 @@ static void amd_set_max_freq_ratio(void) static DEFINE_MUTEX(freq_invariance_lock); -void init_freq_invariance_cppc(void) +static inline void init_freq_invariance_cppc(void) { static bool init_done; @@ -127,6 +127,11 @@ void init_freq_invariance_cppc(void) mutex_unlock(&freq_invariance_lock); } +void acpi_processor_init_invariance_cppc(void) +{ + init_freq_invariance_cppc(); +} + /* * Get the highest performance register value. * @cpu: CPU from which to get highest performance. diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 1a40f0514eaa3..5c0cc7aae8726 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -671,10 +671,6 @@ static int pcc_data_alloc(int pcc_ss_id) * ) */ -#ifndef arch_init_invariance_cppc -static inline void arch_init_invariance_cppc(void) { } -#endif - /** * acpi_cppc_processor_probe - Search for per CPU _CPC objects. * @pr: Ptr to acpi_processor containing this CPU's logical ID. @@ -905,8 +901,6 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) goto out_free; } - arch_init_invariance_cppc(); - kfree(output.pointer); return 0; diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index cb52dd000b958..3b281bc1e73c3 100644 --- a/drivers/acpi/processor_driver.c +++ b/drivers/acpi/processor_driver.c @@ -237,6 +237,9 @@ static struct notifier_block acpi_processor_notifier_block = { .notifier_call = acpi_processor_notifier, }; +void __weak acpi_processor_init_invariance_cppc(void) +{ } + /* * We keep the driver loaded even when ACPI is not running. * This is needed for the powernow-k8 driver, that works even without @@ -270,6 +273,12 @@ static int __init acpi_processor_driver_init(void) NULL, acpi_soft_cpu_dead); acpi_processor_throttling_init(); + + /* + * Frequency invariance calculations on AMD platforms can't be run until + * after acpi_cppc_processor_probe() has been called for all online CPUs + */ + acpi_processor_init_invariance_cppc(); return 0; err: driver_unregister(&acpi_processor_driver); diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c index 75fcb75d55155..3ebe77566788b 100644 --- a/drivers/base/arch_topology.c +++ b/drivers/base/arch_topology.c @@ -366,7 +366,7 @@ void __weak freq_inv_set_max_ratio(int cpu, u64 max_rate) #ifdef CONFIG_ACPI_CPPC_LIB #include <acpi/cppc_acpi.h> -void topology_init_cpu_capacity_cppc(void) +static inline void topology_init_cpu_capacity_cppc(void) { u64 capacity, capacity_scale = 0; struct cppc_perf_caps perf_caps; @@ -417,6 +417,10 @@ void topology_init_cpu_capacity_cppc(void) exit: free_raw_capacity(); } +void acpi_processor_init_invariance_cppc(void) +{ + topology_init_cpu_capacity_cppc(); +} #endif #ifdef CONFIG_CPU_FREQ diff --git a/include/acpi/processor.h b/include/acpi/processor.h index e6f6074eadbf3..a17e97e634a68 100644 --- a/include/acpi/processor.h +++ b/include/acpi/processor.h @@ -465,4 +465,6 @@ extern int acpi_processor_ffh_lpi_probe(unsigned int cpu); extern int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi); #endif +void acpi_processor_init_invariance_cppc(void); + #endif diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h index b721f360d7592..4a952c4885edc 100644 --- a/include/linux/arch_topology.h +++ b/include/linux/arch_topology.h @@ -11,10 +11,6 @@ void topology_normalize_cpu_scale(void); int topology_update_cpu_topology(void); -#ifdef CONFIG_ACPI_CPPC_LIB -void topology_init_cpu_capacity_cppc(void); -#endif - struct device_node; bool topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu);