linux-kernel - [PATCH 3.12 031/111] perf/x86/amd/ibs: Update IBS MSRs and feature definitions

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Date:	Wed, 10 Jun 2015 17:26:20 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Len Brown <len.brown@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Peter Zijlstra <peterz@...radead.org>, <paulus@...ba.org>,
	<acme@...nel.org>, Ingo Molnar <mingo@...nel.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 031/111] perf/x86/amd/ibs: Update IBS MSRs and feature definitions

From: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 904cb3677f3adcd3d837be0a0d0b14251ba8d6f7 upstream.

New Fam15h models carry extra feature bits and extend
the MSR register space for IBS ops. Adding them here.

While at it, add functionality to read IbsBrTarget and
OpData4 depending on their availability if user wants a
PERF_SAMPLE_RAW.

Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>
Acked-by: Borislav Petkov <bp@...e.de>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Jan Kiszka <jan.kiszka@...mens.com>
Cc: Len Brown <len.brown@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: <paulus@...ba.org>
Cc: <acme@...nel.org>
Link: http://lkml.kernel.org/r/1415651066-13523-1-git-send-email-Aravind.Gopalakrishnan@amd.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/x86/include/asm/perf_event.h        |  3 +++
 arch/x86/include/uapi/asm/msr-index.h    |  1 +
 arch/x86/kernel/cpu/perf_event_amd_ibs.c | 15 +++++++++++++++
 3 files changed, 19 insertions(+)

diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index 8249df45d2f2..348d9ac94d4e 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -169,6 +169,9 @@ struct x86_pmu_capability {
 #define IBS_CAPS_BRNTRGT		(1U<<5)
 #define IBS_CAPS_OPCNTEXT		(1U<<6)
 #define IBS_CAPS_RIPINVALIDCHK		(1U<<7)
+#define IBS_CAPS_OPBRNFUSE		(1U<<8)
+#define IBS_CAPS_FETCHCTLEXTD		(1U<<9)
+#define IBS_CAPS_OPDATA4		(1U<<10)
 
 #define IBS_CAPS_DEFAULT		(IBS_CAPS_AVAIL		\
 					 | IBS_CAPS_FETCHSAM	\
diff --git a/arch/x86/include/uapi/asm/msr-index.h b/arch/x86/include/uapi/asm/msr-index.h
index 228d95f6592a..dbb591390b9e 100644
--- a/arch/x86/include/uapi/asm/msr-index.h
+++ b/arch/x86/include/uapi/asm/msr-index.h
@@ -201,6 +201,7 @@
 #define MSR_AMD64_IBSOP_REG_MASK	((1UL<<MSR_AMD64_IBSOP_REG_COUNT)-1)
 #define MSR_AMD64_IBSCTL		0xc001103a
 #define MSR_AMD64_IBSBRTARGET		0xc001103b
+#define MSR_AMD64_IBSOPDATA4		0xc001103d
 #define MSR_AMD64_IBS_REG_COUNT_MAX	8 /* includes MSR_AMD64_IBSBRTARGET */
 
 /* Fam 16h MSRs */
diff --git a/arch/x86/kernel/cpu/perf_event_amd_ibs.c b/arch/x86/kernel/cpu/perf_event_amd_ibs.c
index 4b8e4d3cd6ea..6a4b5456240a 100644
--- a/arch/x86/kernel/cpu/perf_event_amd_ibs.c
+++ b/arch/x86/kernel/cpu/perf_event_amd_ibs.c
@@ -565,6 +565,21 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs)
 				       perf_ibs->offset_max,
 				       offset + 1);
 	} while (offset < offset_max);
+	if (event->attr.sample_type & PERF_SAMPLE_RAW) {
+		/*
+		 * Read IbsBrTarget and IbsOpData4 separately
+		 * depending on their availability.
+		 * Can't add to offset_max as they are staggered
+		 */
+		if (ibs_caps & IBS_CAPS_BRNTRGT) {
+			rdmsrl(MSR_AMD64_IBSBRTARGET, *buf++);
+			size++;
+		}
+		if (ibs_caps & IBS_CAPS_OPDATA4) {
+			rdmsrl(MSR_AMD64_IBSOPDATA4, *buf++);
+			size++;
+		}
+	}
 	ibs_data.size = sizeof(u64) * size;
 
 	regs = *iregs;
-- 
2.4.2

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