From b79276dcac9124a79c8cf7cc8fbdd3d4c3c9a7c7 Mon Sep 17 00:00:00 2001 From: Mario Limonciello Date: Mon, 4 Nov 2024 16:28:55 -0600 Subject: [PATCH] ACPI: processor: Move arch_init_invariance_cppc() call later 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 Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219431 Tested-by: Oleksandr Natalenko Signed-off-by: Mario Limonciello Link: https://patch.msgid.link/20241104222855.3959267-1-superm1@kernel.org [ rjw: Changelog edit ] Signed-off-by: Rafael J. Wysocki --- 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 5fc3af9f8f29..341174bf9106 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 aef70336d624..92f3664dd933 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 956984054bf3..aab9d0570841 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 1a40f0514eaa..5c0cc7aae872 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 cb52dd000b95..3b281bc1e73c 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 75fcb75d5515..3ebe77566788 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 -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 e6f6074eadbf..a17e97e634a6 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 b721f360d759..4a952c4885ed 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);