linux-kernel - [PATCH 04/13] perf/core: Extend perf_output_sample_regs() to include perf_arch

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Date:   Mon, 29 Aug 2016 02:30:49 +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 04/13] perf/core: Extend perf_output_sample_regs() to include perf_arch_regs

Extend perf_output_sample_regs() to take in perf_regs structure as
a parameter instead of pt_regs. Add code to check for arch_regs_mask
and dump the arch registers to the output sample.

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 274288819829..e16bf4d057d1 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5371,16 +5371,24 @@ u64 __attribute__((weak)) perf_arch_reg_value(struct perf_arch_regs *regs,
 
 static void
 perf_output_sample_regs(struct perf_output_handle *handle,
-			struct pt_regs *regs, u64 mask)
+				struct perf_regs *regs, u64 mask)
 {
 	int bit;
 	DECLARE_BITMAP(_mask, 64);
+	u64 arch_regs_mask = regs->arch_regs_mask;
 
 	bitmap_from_u64(_mask, mask);
 	for_each_set_bit(bit, _mask, sizeof(mask) * BITS_PER_BYTE) {
 		u64 val;
 
-		val = perf_reg_value(regs, bit);
+		val = perf_reg_value(regs->regs, bit);
+		perf_output_put(handle, val);
+	}
+
+	bitmap_from_u64(_mask, arch_regs_mask);
+	for_each_set_bit(bit, _mask, sizeof(mask) * BITS_PER_BYTE) {
+		u64 val;
+		val = perf_arch_reg_value(regs->arch_regs, bit);
 		perf_output_put(handle, val);
 	}
 }
@@ -5792,7 +5800,7 @@ void perf_output_sample(struct perf_output_handle *handle,
 		if (abi) {
 			u64 mask = event->attr.sample_regs_user;
 			perf_output_sample_regs(handle,
-						data->regs_user.regs,
+						&data->regs_user,
 						mask);
 		}
 	}
@@ -5827,7 +5835,7 @@ void perf_output_sample(struct perf_output_handle *handle,
 			u64 mask = event->attr.sample_regs_intr;
 
 			perf_output_sample_regs(handle,
-						data->regs_intr.regs,
+						&data->regs_intr,
 						mask);
 		}
 	}
-- 
2.7.4