From nobody Sun Nov 24 14:27:19 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 267A81F7087; Mon, 4 Nov 2024 20:54:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730753694; cv=none; b=r6kd4iPEDHdevcpjk3mT1CgXlny3Z2WIUC0s+LB2WI8mUvZDJqdKNS/4/L6Idl43MvUOVqBMxK+8GVdOChSCQynnlEITzV5QF4xhutL6Vrkrzf91Tm1t5HWm7+w5TBQkLyrq9O2R3WOx+ARSn/RpEmKh9NSDwIB8eWNbo5Y6NOo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730753694; c=relaxed/simple; bh=2yRz5nUe4da7Yl2yzaqL5hAUKq8X0c65ags71T6J4q4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=i30YUSi8F0hWO4bh0jbccE6ohYSMIEnRVUhtbWG0S+8xjME2/Hw4jDH27B/Sr/nV9OdrEuIB8jw3pPB2OsDyyksrLul1h39enjhbWkka8wYiVQV/QnU/GTrkK4kUDox93L0H59tDQ7TZHv/gQb0emvg9WZ7nKcsC6JJkok7p/jY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CZQ2xIGr; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CZQ2xIGr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1FD48C4CECE; Mon, 4 Nov 2024 20:54:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730753693; bh=2yRz5nUe4da7Yl2yzaqL5hAUKq8X0c65ags71T6J4q4=; h=From:To:Cc:Subject:Date:From; b=CZQ2xIGrJggWdP15D2rvE7J1XtI8uJ98UN/Kf3b0D8bfvGxF5ufDJ3TX9D64Eeoz5 LgFAGtidKJuAkMNJsbObpTEKfuQYm5iZ3vQugKArXvhcXoBG18UzgG/B8SkOXd0fG6 ocYY4WvECV2V59PVYA4hzCWPkx8hOyvHgLbjuPPeBo/EJ/kCjpqfqIhCL6V6pm6pm+ k5GLiU2z+Bap5v8yKWAC9CxmI7Nisw50bF4SI0t7/Z4CJQIgtLI4pb5hRcbtAoyO8i uM1rAavqM/7770nRD2d6vNDMyHU90tSQ/gyp/vNpuvIfUuzrG0V7YIcfZNVYJKBJT2 jqJcVCRl/g/0A== From: Mario Limonciello To: Borislav Petkov , "Rafael J . Wysocki" Cc: Thomas Gleixner , Ingo Molnar , Dave Hansen , x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)), "H . Peter Anvin" , Len Brown , Peter Zijlstra , Mario Limonciello , "Gautham R . Shenoy" , linux-kernel@vger.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)), linux-acpi@vger.kernel.org (open list:ACPI), Ivan Shapovalov , Oleksandr Natalenko Subject: [PATCH v3] ACPI: processor: Move arch_init_invariance_cppc() call later Date: Mon, 4 Nov 2024 14:54:46 -0600 Message-ID: <20241104205446.3874509-1-superm1@kernel.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Mario Limonciello 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. Fixes: 279f838a61f9 ("x86/amd: Detect preferred cores in amd_get_boost_rati= o_numerator()") Reported-by: Ivan Shapovalov Closes: https://bugzilla.kernel.org/show_bug.cgi?id=3D219431 Tested-by: Oleksandr Natalenko Signed-off-by: Mario Limonciello --- v3: * Weak symbol instead of macro to help riscv build failure * Update commit message * Add comment --- arch/arm64/include/asm/topology.h | 2 +- arch/x86/include/asm/topology.h | 2 +- drivers/acpi/cppc_acpi.c | 6 ------ drivers/acpi/processor_driver.c | 9 +++++++++ include/acpi/processor.h | 2 ++ 5 files changed, 13 insertions(+), 8 deletions(-) diff --git a/arch/arm64/include/asm/topology.h b/arch/arm64/include/asm/top= ology.h index 5fc3af9f8f29b..8a1860877967e 100644 --- a/arch/arm64/include/asm/topology.h +++ b/arch/arm64/include/asm/topology.h @@ -27,7 +27,7 @@ void update_freq_counters_refs(void); #define arch_scale_freq_ref topology_get_freq_ref =20 #ifdef CONFIG_ACPI_CPPC_LIB -#define arch_init_invariance_cppc topology_init_cpu_capacity_cppc +#define acpi_processor_init_invariance_cppc topology_init_cpu_capacity_cppc #endif =20 /* Replace task scheduler's default cpu-invariant accounting */ diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topolog= y.h index aef70336d6247..0fb705524aeaa 100644 --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -307,7 +307,7 @@ extern void arch_scale_freq_tick(void); =20 #ifdef CONFIG_ACPI_CPPC_LIB void init_freq_invariance_cppc(void); -#define arch_init_invariance_cppc init_freq_invariance_cppc +#define acpi_processor_init_invariance_cppc init_freq_invariance_cppc #endif =20 #endif /* _ASM_X86_TOPOLOGY_H */ 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) * ) */ =20 -#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; } =20 - arch_init_invariance_cppc(); - kfree(output.pointer); return 0; =20 diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_drive= r.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_bl= ock =3D { .notifier_call =3D acpi_processor_notifier, }; =20 +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); =20 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/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 cp= u); extern int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi); #endif =20 +void acpi_processor_init_invariance_cppc(void); + #endif base-commit: 6db936d4ac0fe281af48b4d1ebf69b1523bbac31 --=20 2.43.0