From: Kim Phillips kim.phillips@amd.com
commit 25d387287cf0330abf2aad761ce6eee67326a355 upstream.
Commit 3fe3331bb285 ("perf/x86/amd: Add event map for AMD Family 17h"), claimed L2 misses were unsupported, due to them not being found in its referenced documentation, whose link has now moved [1].
That old documentation listed PMCx064 unit mask bit 3 as:
"LsRdBlkC: LS Read Block C S L X Change to X Miss."
and bit 0 as:
"IcFillMiss: IC Fill Miss"
We now have new public documentation [2] with improved descriptions, that clearly indicate what events those unit mask bits represent:
Bit 3 now clearly states:
"LsRdBlkC: Data Cache Req Miss in L2 (all types)"
and bit 0 is:
"IcFillMiss: Instruction Cache Req Miss in L2."
So we can now add support for L2 misses in perf's genericised events as PMCx064 with both the above unit masks.
[1] The commit's original documentation reference, "Processor Programming Reference (PPR) for AMD Family 17h Model 01h, Revision B1 Processors", originally available here:
https://www.amd.com/system/files/TechDocs/54945_PPR_Family_17h_Models_00h-0F...
is now available here:
https://developer.amd.com/wordpress/media/2017/11/54945_PPR_Family_17h_Model...
[2] "Processor Programming Reference (PPR) for Family 17h Model 31h, Revision B0 Processors", available here:
https://developer.amd.com/wp-content/resources/55803_0.54-PUB.pdf
Fixes: 3fe3331bb285 ("perf/x86/amd: Add event map for AMD Family 17h") Reported-by: Babu Moger babu.moger@amd.com Signed-off-by: Kim Phillips kim.phillips@amd.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Signed-off-by: Ingo Molnar mingo@kernel.org Tested-by: Babu Moger babu.moger@amd.com Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20200121171232.28839-1-kim.phillips@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/events/amd/core.c | 1 + 1 file changed, 1 insertion(+)
--- a/arch/x86/events/amd/core.c +++ b/arch/x86/events/amd/core.c @@ -246,6 +246,7 @@ static const u64 amd_f17h_perfmon_event_ [PERF_COUNT_HW_CPU_CYCLES] = 0x0076, [PERF_COUNT_HW_INSTRUCTIONS] = 0x00c0, [PERF_COUNT_HW_CACHE_REFERENCES] = 0xff60, + [PERF_COUNT_HW_CACHE_MISSES] = 0x0964, [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x00c2, [PERF_COUNT_HW_BRANCH_MISSES] = 0x00c3, [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = 0x0287,