From: Huang Rui ray.huang@amd.com
commit 3743d55b289c203d8f77b7cd47c24926b9d186ae upstream.
Some AMD Ryzen generations has different calculation method on maximum performance. 255 is not for all ASICs, some specific generations should use 166 as the maximum performance. Otherwise, it will report incorrect frequency value like below:
~ → lscpu | grep MHz CPU MHz: 3400.000 CPU max MHz: 7228.3198 CPU min MHz: 2200.0000
[ mingo: Tidied up whitespace use. ] [ Alexander Monakov amonakov@ispras.ru: fix 225 -> 255 typo. ]
Fixes: 41ea667227ba ("x86, sched: Calculate frequency invariance for AMD systems") Fixes: 3c55e94c0ade ("cpufreq: ACPI: Extend frequency tables to cover boost frequencies") Reported-by: Jason Bagavatsingham jason.bagavatsingham@gmail.com Fixed-by: Alexander Monakov amonakov@ispras.ru Reviewed-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Huang Rui ray.huang@amd.com Signed-off-by: Ingo Molnar mingo@kernel.org Tested-by: Jason Bagavatsingham jason.bagavatsingham@gmail.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20210425073451.2557394-1-ray.huang@amd.com Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=211791 Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/include/asm/processor.h | 2 ++ arch/x86/kernel/cpu/amd.c | 16 ++++++++++++++++ arch/x86/kernel/smpboot.c | 2 +- drivers/cpufreq/acpi-cpufreq.c | 6 +++++- 4 files changed, 24 insertions(+), 2 deletions(-)
--- 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_s
#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) --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -1170,3 +1170,19 @@ void set_dr_addr_mask(unsigned long mask break; } } + +u32 amd_get_highest_perf(void) +{ + struct cpuinfo_x86 *c = &boot_cpu_data; + + if (c->x86 == 0x17 && ((c->x86_model >= 0x30 && c->x86_model < 0x40) || + (c->x86_model >= 0x70 && c->x86_model < 0x80))) + return 166; + + if (c->x86 == 0x19 && ((c->x86_model >= 0x20 && c->x86_model < 0x30) || + (c->x86_model >= 0x40 && c->x86_model < 0x70))) + return 166; + + return 255; +} +EXPORT_SYMBOL_GPL(amd_get_highest_perf); --- 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 = perf_caps.highest_perf; + highest_perf = amd_get_highest_perf(); nominal_perf = perf_caps.nominal_perf;
if (!highest_perf || !nominal_perf) { --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -646,7 +646,11 @@ static u64 get_max_boost_ratio(unsigned return 0; }
- highest_perf = perf_caps.highest_perf; + if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) + highest_perf = amd_get_highest_perf(); + else + highest_perf = perf_caps.highest_perf; + nominal_perf = perf_caps.nominal_perf;
if (!highest_perf || !nominal_perf) {