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Wysocki" , Borislav Petkov , the arch/x86 maintainers , Stable Subject: Re: [PATCH v2] x86, sched: Fix the AMD CPPC maximum perf on some specific generations Message-ID: <20210425071856.GB2175798@hr-amd> References: <20210421023807.1540290-1-ray.huang@amd.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: X-Originating-IP: [58.247.170.245] X-ClientProxiedBy: HK2PR02CA0157.apcprd02.prod.outlook.com (2603:1096:201:1f::17) To MWHPR12MB1248.namprd12.prod.outlook.com (2603:10b6:300:12::21) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from hr-amd (58.247.170.245) by HK2PR02CA0157.apcprd02.prod.outlook.com (2603:1096:201:1f::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4065.20 via Frontend Transport; Sun, 25 Apr 2021 07:19:03 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 4eacde6f-33bc-4d77-2865-08d907ba6932 X-MS-TrafficTypeDiagnostic: MWHPR1201MB2540: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; 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Wysocki wrote: > On Wed, Apr 21, 2021 at 4:38 AM Huang Rui wrote: > > > > Some AMD Ryzen generations has different calculation method on maximum > > perf. 255 is not for all asics, some specific generations should use 166 > > as the maximum perf. Otherwise, it will report incorrect frequency value > > like below: > > > > ~ =1B$B"*=1B(B lscpu | grep MHz > > CPU MHz: 3400.000 > > CPU max MHz: 7228.3198 > > CPU min MHz: 2200.0000 > > > > Fixes: 41ea667227ba ("x86, sched: Calculate frequency invariance for AM= D systems") > > Fixes: 3c55e94c0ade ("cpufreq: ACPI: Extend frequency tables to cover b= oost frequencies") > > > > Reported-by: Jason Bagavatsingham > > Tested-by: Jason Bagavatsingham > > Bugzilla: https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3= A%2F%2Fbugzilla.kernel.org%2Fshow_bug.cgi%3Fid%3D211791&data=3D04%7C01%= 7Cray.huang%40amd.com%7C5069cfd46dfe4f0c504208d9066b41be%7C3dd8961fe4884e60= 8e11a82d994e183d%7C0%7C0%7C637547880005034494%7CUnknown%7CTWFpbGZsb3d8eyJWI= joiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sd= ata=3DYSgziLlmyJlAxMQceGlx%2FB1EgN50h512ai1F4ypXoD8%3D&reserved=3D0 > > Signed-off-by: Huang Rui > > Cc: Alex Deucher > > Cc: Nathan Fontenot > > Cc: Rafael J. Wysocki > > Cc: Borislav Petkov > > Cc: x86@kernel.org > > Cc: stable@vger.kernel.org > > --- > > > > Changes from V1 -> V2: > > - Enhance the commit message. > > - Move amd_get_highest_perf() into amd.c. > > - Refine the implementation of switch-case. > > - Cc stable mail list. > > > > --- > > arch/x86/include/asm/processor.h | 2 ++ > > arch/x86/kernel/cpu/amd.c | 22 ++++++++++++++++++++++ > > arch/x86/kernel/smpboot.c | 2 +- > > drivers/cpufreq/acpi-cpufreq.c | 19 +++++++++++++++++++ > > 4 files changed, 44 insertions(+), 1 deletion(-) > > > > diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/pr= ocessor.h > > index f1b9ed5efaa9..908bcaea1361 100644 > > --- a/arch/x86/include/asm/processor.h > > +++ b/arch/x86/include/asm/processor.h > > @@ -804,8 +804,10 @@ DECLARE_PER_CPU(u64, msr_misc_features_shadow); > > > > #ifdef CONFIG_CPU_SUP_AMD > > extern u32 amd_get_nodes_per_socket(void); > > +extern u32 amd_get_highest_perf(void); > > #else > > static inline u32 amd_get_nodes_per_socket(void) { return 0; } > > +static inline u32 amd_get_highest_perf(void) { return 0; } > > #endif > > > > static inline uint32_t hypervisor_cpuid_base(const char *sig, uint32_t= leaves) > > diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c > > index 347a956f71ca..aadb691d9357 100644 > > --- a/arch/x86/kernel/cpu/amd.c > > +++ b/arch/x86/kernel/cpu/amd.c > > @@ -1170,3 +1170,25 @@ void set_dr_addr_mask(unsigned long mask, int dr) > > break; > > } > > } > > + > > +u32 amd_get_highest_perf(void) > > +{ > > + struct cpuinfo_x86 *c =3D &boot_cpu_data; > > + u32 cppc_max_perf =3D 225; >=20 > The extra local variable is redundant. >=20 > > + > > + switch (c->x86) { > > + case 0x17: > > + if ((c->x86_model >=3D 0x30 && c->x86_model < 0x40) || > > + (c->x86_model >=3D 0x70 && c->x86_model < 0x80)) > > + cppc_max_perf =3D 166; > > + break; >=20 > Also it would be cleaner to write this as >=20 > if (c->x86 =3D=3D 0x17 && ((c->x86_model >=3D 0x30 && c->x86_model < 0x40= ) || > (c->x86_model >=3D 0x70 && c->x86_model < 0x80)) > return 166; >=20 > And analogously below. >=20 > > + case 0x19: > > + if ((c->x86_model >=3D 0x20 && c->x86_model < 0x30) || > > + (c->x86_model >=3D 0x40 && c->x86_model < 0x70)) > > + cppc_max_perf =3D 166; > > + break; > > + } > > + > > + return cppc_max_perf; >=20 > And here >=20 > return 225; >=20 > > +} > > +EXPORT_SYMBOL_GPL(amd_get_highest_perf); > > diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c > > index 02813a7f3a7c..7bec57d04a87 100644 > > --- a/arch/x86/kernel/smpboot.c > > +++ b/arch/x86/kernel/smpboot.c > > @@ -2046,7 +2046,7 @@ static bool amd_set_max_freq_ratio(void) > > return false; > > } > > > > - highest_perf =3D perf_caps.highest_perf; > > + highest_perf =3D amd_get_highest_perf(); > > nominal_perf =3D perf_caps.nominal_perf; > > > > if (!highest_perf || !nominal_perf) { > > diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpuf= req.c > > index d1bbc16fba4b..3f0a19dd658c 100644 > > --- a/drivers/cpufreq/acpi-cpufreq.c > > +++ b/drivers/cpufreq/acpi-cpufreq.c > > @@ -630,6 +630,22 @@ static int acpi_cpufreq_blacklist(struct cpuinfo_x= 86 *c) > > #endif > > > > #ifdef CONFIG_ACPI_CPPC_LIB > > + > > +static u64 get_amd_max_boost_ratio(unsigned int cpu, u64 nominal_perf) > > +{ > > + u64 boost_ratio, cppc_max_perf; > > + > > + if (!nominal_perf) > > + return 0; > > + > > + cppc_max_perf =3D amd_get_highest_perf(); > > + > > + boost_ratio =3D div_u64(cppc_max_perf << SCHED_CAPACITY_SHIFT, > > + nominal_perf); > > + > > + return boost_ratio; > > +} >=20 > The function above is not necessary if I'm not mistaken. >=20 Yes, right. > > + > > static u64 get_max_boost_ratio(unsigned int cpu) > > { > > struct cppc_perf_caps perf_caps; > > @@ -646,6 +662,9 @@ static u64 get_max_boost_ratio(unsigned int cpu) > > return 0; > > } > > > > + if (boot_cpu_data.x86_vendor =3D=3D X86_VENDOR_AMD) > > + return get_amd_max_boost_ratio(cpu, perf_caps.nominal_p= erf); > > + > > highest_perf =3D perf_caps.highest_perf; >=20 > The above can be written as >=20 > if (boot_cpu_data.x86_vendor =3D=3D X86_VENDOR_AMD) > highest_perf =3D amd_get_highest_perf(); > else > highest_perf =3D perf_caps.highest_perf; >=20 Thanks to simplify the implementation. Will update it in V4. Best Regards, Ray