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x86, sched: Fix the AMD CPPC maximum performance value on certain AMD Ryzen generations

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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: 41ea667227 ("x86, sched: Calculate frequency invariance for AMD systems")
Fixes: 3c55e94c0a ("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>
This commit is contained in:
Huang Rui 2021-04-25 15:34:51 +08:00 committed by Ingo Molnar
parent 02dbb7246c
commit 3743d55b28
4 changed files with 24 additions and 2 deletions
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2
arch/x86/include/asm/processor.h
View File

@ -787,8 +787,10 @@ 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)

16
arch/x86/kernel/cpu/amd.c
View File

@ -1165,3 +1165,19 @@ void set_dr_addr_mask(unsigned long mask, int dr)
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);

2
arch/x86/kernel/smpboot.c
View File

@ -2043,7 +2043,7 @@ 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) {

6
drivers/cpufreq/acpi-cpufreq.c
View File

@ -646,7 +646,11 @@ static u64 get_max_boost_ratio(unsigned int cpu)
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) {