linux-kernel - [PATCH 1/2 v2] perf/x86/amd: Add missing L2 misses event spec to AMD Family 17h's event map

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Date:   Tue, 21 Jan 2020 11:12:31 -0600
From:   Kim Phillips <kim.phillips@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        kim.phillips@....com
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Babu Moger <babu.moger@....com>,
        Borislav Petkov <bp@...en8.de>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Frank van der Linden <fllinden@...zon.com>,
        "H . Peter Anvin" <hpa@...or.com>, Huang Rui <ray.huang@....com>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        Jan Beulich <jbeulich@...e.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Luwei Kang <luwei.kang@...el.com>,
        Martin Liška <mliska@...e.cz>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Namhyung Kim <namhyung@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Lendacky <thomas.lendacky@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH 1/2 v2] perf/x86/amd: Add missing L2 misses event spec to AMD Family 17h's event map

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-0Fh.pdf

    is now available here:

        https://developer.amd.com/wordpress/media/2017/11/54945_PPR_Family_17h_Models_00h-0Fh.pdf

[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

Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Babu Moger <babu.moger@....com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Frank van der Linden <fllinden@...zon.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Huang Rui <ray.huang@....com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Janakarajan Natarajan <Janakarajan.Natarajan@....com>
Cc: Jan Beulich <jbeulich@...e.com>
Cc: Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Luwei Kang <luwei.kang@...el.com>
Cc: Martin Liška <mliska@...e.cz>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: x86@...nel.org
Cc: linux-kernel@...r.kernel.org
Cc: stable@...r.kernel.org
Reported-by: Babu Moger <babu.moger@....com>
Tested-by: Babu Moger <babu.moger@....com>
Fixes: 3fe3331bb285 ("perf/x86/amd: Add event map for AMD Family 17h")
Signed-off-by: Kim Phillips <kim.phillips@....com>
---
v2: no changes.

 arch/x86/events/amd/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/events/amd/core.c b/arch/x86/events/amd/core.c
index 1f22b6bbda68..39eb276d0277 100644
--- a/arch/x86/events/amd/core.c
+++ b/arch/x86/events/amd/core.c
@@ -250,6 +250,7 @@ static const u64 amd_f17h_perfmon_event_map[PERF_COUNT_HW_MAX] =
 	[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,
-- 
2.25.0