powerpc/perf: Add restrictions to PMC5 in power9 DD1

[ Upstream commit 8d911904f3ce412b20874a9c95f82009dcbb007c ]

PMC5 on POWER9 DD1 may not provide right counts in all
sampling scenarios, hence use PM_INST_DISP event instead
in PMC2 or PMC3 in preference.

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/perf/isa207-common.h b/arch/powerpc/perf/isa207-common.h
index 4d0a4e5017c20377fc0ebd9e5bd286d6a26ee74b..8e6dd17fe603eb9ec24ba8f9703926e18fd303f7 100644 (file)
--- a/arch/powerpc/perf/isa207-common.h
+++ b/arch/powerpc/perf/isa207-common.h
@@ -201,6 +201,10 @@
        CNST_PMC_VAL(1) | CNST_PMC_VAL(2) | CNST_PMC_VAL(3) | \
        CNST_PMC_VAL(4) | CNST_PMC_VAL(5) | CNST_PMC_VAL(6) | CNST_NC_VAL
 
+/*
+ * Lets restrict use of PMC5 for instruction counting.
+ */
+#define P9_DD1_TEST_ADDER      (ISA207_TEST_ADDER | CNST_PMC_VAL(5))
 
 /* Bits in MMCR1 for PowerISA v2.07 */
 #define MMCR1_UNIT_SHIFT(pmc)          (60 - (4 * ((pmc) - 1)))

diff --git a/arch/powerpc/perf/power9-pmu.c b/arch/powerpc/perf/power9-pmu.c
index 8e9a81967ff8516b8c04d47e65df92c7daeeba1c..9abcd8f655042daf7356235fa7d252aec616fe7c 100644 (file)
--- a/arch/powerpc/perf/power9-pmu.c
+++ b/arch/powerpc/perf/power9-pmu.c
@@ -295,7 +295,7 @@ static struct power_pmu power9_pmu = {
        .name                   = "POWER9",
        .n_counter              = MAX_PMU_COUNTERS,
        .add_fields             = ISA207_ADD_FIELDS,
-       .test_adder             = ISA207_TEST_ADDER,
+       .test_adder             = P9_DD1_TEST_ADDER,
        .compute_mmcr           = isa207_compute_mmcr,
        .config_bhrb            = power9_config_bhrb,
        .bhrb_filter_map        = power9_bhrb_filter_map,