Commit ab027620 authored Jun 14, 2017 by Janakarajan Natarajan Committed by Ingo Molnar Aug 10, 2017

perf/x86/amd/uncore: Get correct number of cores sharing last level cache



In Family 17h, the number of cores sharing a cache level is obtained
from the Cache Properties CPUID leaf (0x8000001d) by passing in the
cache level in ECX. In prior families, a cache level of 2 was used to
determine this information.

To get the right information, irrespective of Family, iterate over
the cache levels using CPUID 0x8000001d. The last level cache is the
last value to return a non-zero value in EAX.

Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/5ab569025b39cdfaeca55b571d78c0fc800bdb69.1497452002.git.Janakarajan.Natarajan@amd.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 910448bb

arch/x86/events/amd/uncore.c

+16 −3

Original line number	Diff line number	Diff line
		@@ -400,11 +400,24 @@ static int amd_uncore_cpu_starting(unsigned int cpu)

		if (amd_uncore_llc) {
		unsigned int apicid = cpu_data(cpu).apicid;
		unsigned int nshared;
		unsigned int nshared, subleaf, prev_eax = 0;

		uncore = *per_cpu_ptr(amd_uncore_llc, cpu);
		cpuid_count(0x8000001d, 2, &eax, &ebx, &ecx, &edx);
		nshared = ((eax >> 14) & 0xfff) + 1;
		/*
		* 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 = amd_uncore_find_online_sibling(uncore, amd_uncore_llc);

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