linux-kernel - [PATCH 03/13] perf/core: Update perf_*_sample() to include perf_arch

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Date:   Mon, 29 Aug 2016 02:30:48 +0530
From:   Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc:     Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Stephane Eranian <eranian@...il.com>,
        Russell King <linux@....linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Subject: [PATCH 03/13] perf/core: Update perf_*_sample() to include perf_arch_regs

perf_prepare_sample is extended to include the perf_arch_regs_mask
in the sample header size calculation. Update perf_output_sample() to dump
the perf_arch_regs_mask to sample output.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Stephane Eranian <eranian@...il.com>
Cc: Russell King <linux@....linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
---
 kernel/events/core.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 8cf540275c34..274288819829 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5780,12 +5780,14 @@ void perf_output_sample(struct perf_output_handle *handle,
 
 	if (sample_type & PERF_SAMPLE_REGS_USER) {
 		u64 abi = data->regs_user.abi;
+		u64 arch_regs_mask = data->regs_user.arch_regs_mask;
 
 		/*
 		 * If there are no regs to dump, notice it through
 		 * first u64 being zero (PERF_SAMPLE_REGS_ABI_NONE).
 		 */
 		perf_output_put(handle, abi);
+		perf_output_put(handle, arch_regs_mask);
 
 		if (abi) {
 			u64 mask = event->attr.sample_regs_user;
@@ -5812,11 +5814,14 @@ void perf_output_sample(struct perf_output_handle *handle,
 
 	if (sample_type & PERF_SAMPLE_REGS_INTR) {
 		u64 abi = data->regs_intr.abi;
+		u64 arch_regs_mask = data->regs_intr.arch_regs_mask;
+
 		/*
 		 * If there are no regs to dump, notice it through
 		 * first u64 being zero (PERF_SAMPLE_REGS_ABI_NONE).
 		 */
 		perf_output_put(handle, abi);
+		perf_output_put(handle, arch_regs_mask);
 
 		if (abi) {
 			u64 mask = event->attr.sample_regs_intr;
@@ -5910,8 +5915,8 @@ void perf_prepare_sample(struct perf_event_header *header,
 				      &data->regs_user_copy);
 
 	if (sample_type & PERF_SAMPLE_REGS_USER) {
-		/* regs dump ABI info */
-		int size = sizeof(u64);
+		/* regs dump ABI info and arch_regs_mask */
+		int size = sizeof(u64) * 2;
 
 		if (data->regs_user.regs) {
 			u64 mask = event->attr.sample_regs_user;
@@ -5947,8 +5952,8 @@ void perf_prepare_sample(struct perf_event_header *header,
 	}
 
 	if (sample_type & PERF_SAMPLE_REGS_INTR) {
-		/* regs dump ABI info */
-		int size = sizeof(u64);
+		/* regs dump ABI info and arch_regs_mask */
+		int size = sizeof(u64) * 2;
 
 		perf_sample_regs_intr(&data->regs_intr, regs);
 
@@ -5956,6 +5961,9 @@ void perf_prepare_sample(struct perf_event_header *header,
 			u64 mask = event->attr.sample_regs_intr;
 
 			size += hweight64(mask) * sizeof(u64);
+
+			mask = data->regs_intr.arch_regs_mask;
+			size += hweight64(mask) * sizeof(u64);
 		}
 
 		header->size += size;
-- 
2.7.4