[ Upstream commit 812af433038f984fd951224e8239b09188e36a13 ]
Current logic iterates over CPUID Fn8000001d leafs (Cache Properties) to detect the last level cache, and derive the last-level cache ID. However, this information is already available in the cpu_llc_id. Therefore, make use of it instead.
Signed-off-by: Suravee Suthikulpanit suravee.suthikulpanit@amd.com Signed-off-by: Borislav Petkov bp@suse.de Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: "Peter Zijlstra (Intel)" peterz@infradead.org Cc: Janakarajan Natarajan Janakarajan.Natarajan@amd.com Link: http://lkml.kernel.org/r/1524864877-111962-3-git-send-email-suravee.suthikul... Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/events/amd/uncore.c | 21 ++------------------- 1 file changed, 2 insertions(+), 19 deletions(-)
diff --git a/arch/x86/events/amd/uncore.c b/arch/x86/events/amd/uncore.c index 3a9ab16d9c2b..baa7e36073f9 100644 --- a/arch/x86/events/amd/uncore.c +++ b/arch/x86/events/amd/uncore.c @@ -19,6 +19,7 @@ #include <asm/cpufeature.h> #include <asm/perf_event.h> #include <asm/msr.h> +#include <asm/smp.h>
#define NUM_COUNTERS_NB 4 #define NUM_COUNTERS_L2 4 @@ -414,26 +415,8 @@ static int amd_uncore_cpu_starting(unsigned int cpu) }
if (amd_uncore_llc) { - unsigned int apicid = cpu_data(cpu).apicid; - unsigned int nshared, subleaf, prev_eax = 0; - uncore = *per_cpu_ptr(amd_uncore_llc, cpu); - /* - * Iterate over Cache Topology Definition leaves until no - * more cache descriptions are available. - */ - for (subleaf = 0; subleaf < 5; subleaf++) { - cpuid_count(0x8000001d, subleaf, &eax, &ebx, &ecx, &edx); - - /* EAX[0:4] gives type of cache */ - if (!(eax & 0x1f)) - break; - - prev_eax = eax; - } - nshared = ((prev_eax >> 14) & 0xfff) + 1; - - uncore->id = apicid - (apicid % nshared); + uncore->id = per_cpu(cpu_llc_id, cpu);
uncore = amd_uncore_find_online_sibling(uncore, amd_uncore_llc); *per_cpu_ptr(amd_uncore_llc, cpu) = uncore;