linux-kernel - [PATCH] perf/x86/intel/pt: Fix base for single entry topa

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Date:   Sun, 20 Oct 2019 00:07:26 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:     Jan Stancek <jstancek@...hat.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>
Subject: [PATCH] perf/x86/intel/pt: Fix base for single entry topa

Jan reported failing ltp test for pt. It looks like the reason
is commit 38bb8d77d0b9, that did not keep the TOPA_SHIFT for
entry base, adding it back.

[1] https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/tracing/pt_test/pt_test.c

Reported-by: Jan Stancek <jstancek@...hat.com>
Fixes: 38bb8d77d0b9 ("perf/x86/intel/pt: Split ToPA metadata and page layout")
Signed-off-by: Jiri Olsa <jolsa@...hat.com>
---
 arch/x86/events/intel/pt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index 74e80ed9c6c4..05e43d0f430b 100644
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -627,7 +627,7 @@ static struct topa *topa_alloc(int cpu, gfp_t gfp)
 	 * link as the 2nd entry in the table
 	 */
 	if (!intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries)) {
-		TOPA_ENTRY(&tp->topa, 1)->base = page_to_phys(p);
+		TOPA_ENTRY(&tp->topa, 1)->base = page_to_phys(p) >> TOPA_SHIFT;
 		TOPA_ENTRY(&tp->topa, 1)->end = 1;
 	}
 
-- 
2.21.0