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Message-Id: <20200821161423.347071-33-sashal@kernel.org>
Date: Fri, 21 Aug 2020 12:13:54 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: "Desnes A. Nunes do Rosario" <desnesn@...ux.ibm.com>,
Sachin Sant <sachinp@...ux.vnet.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>,
Sasha Levin <sashal@...nel.org>, linuxppc-dev@...ts.ozlabs.org,
linux-kselftest@...r.kernel.org
Subject: [PATCH AUTOSEL 5.8 33/62] selftests/powerpc: Purge extra count_pmc() calls of ebb selftests
From: "Desnes A. Nunes do Rosario" <desnesn@...ux.ibm.com>
[ Upstream commit 3337bf41e0dd70b4064cdf60acdfcdc2d050066c ]
An extra count on ebb_state.stats.pmc_count[PMC_INDEX(pmc)] is being per-
formed when count_pmc() is used to reset PMCs on a few selftests. This
extra pmc_count can occasionally invalidate results, such as the ones from
cycles_test shown hereafter. The ebb_check_count() failed with an above
the upper limit error due to the extra value on ebb_state.stats.pmc_count.
Furthermore, this extra count is also indicated by extra PMC1 trace_log on
the output of the cycle test (as well as on pmc56_overflow_test):
==========
...
[21]: counter = 8
[22]: register SPRN_MMCR0 = 0x0000000080000080
[23]: register SPRN_PMC1 = 0x0000000080000004
[24]: counter = 9
[25]: register SPRN_MMCR0 = 0x0000000080000080
[26]: register SPRN_PMC1 = 0x0000000080000004
[27]: counter = 10
[28]: register SPRN_MMCR0 = 0x0000000080000080
[29]: register SPRN_PMC1 = 0x0000000080000004
>> [30]: register SPRN_PMC1 = 0x000000004000051e
PMC1 count (0x280000546) above upper limit 0x2800003e8 (+0x15e)
[FAIL] Test FAILED on line 52
failure: cycles
==========
Signed-off-by: Desnes A. Nunes do Rosario <desnesn@...ux.ibm.com>
Tested-by: Sachin Sant <sachinp@...ux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20200626164737.21943-1-desnesn@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
.../selftests/powerpc/pmu/ebb/back_to_back_ebbs_test.c | 2 --
tools/testing/selftests/powerpc/pmu/ebb/cycles_test.c | 2 --
.../selftests/powerpc/pmu/ebb/cycles_with_freeze_test.c | 2 --
.../selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test.c | 2 --
tools/testing/selftests/powerpc/pmu/ebb/ebb.c | 2 --
.../selftests/powerpc/pmu/ebb/ebb_on_willing_child_test.c | 2 --
.../selftests/powerpc/pmu/ebb/lost_exception_test.c | 1 -
.../testing/selftests/powerpc/pmu/ebb/multi_counter_test.c | 7 -------
.../selftests/powerpc/pmu/ebb/multi_ebb_procs_test.c | 2 --
.../testing/selftests/powerpc/pmu/ebb/pmae_handling_test.c | 2 --
.../selftests/powerpc/pmu/ebb/pmc56_overflow_test.c | 2 --
11 files changed, 26 deletions(-)
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/back_to_back_ebbs_test.c b/tools/testing/selftests/powerpc/pmu/ebb/back_to_back_ebbs_test.c
index a2d7b0e3dca97..a26ac122c759f 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/back_to_back_ebbs_test.c
+++ b/tools/testing/selftests/powerpc/pmu/ebb/back_to_back_ebbs_test.c
@@ -91,8 +91,6 @@ int back_to_back_ebbs(void)
ebb_global_disable();
ebb_freeze_pmcs();
- count_pmc(1, sample_period);
-
dump_ebb_state();
event_close(&event);
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/cycles_test.c b/tools/testing/selftests/powerpc/pmu/ebb/cycles_test.c
index bc893813483ee..bb9f587fa76e8 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/cycles_test.c
+++ b/tools/testing/selftests/powerpc/pmu/ebb/cycles_test.c
@@ -42,8 +42,6 @@ int cycles(void)
ebb_global_disable();
ebb_freeze_pmcs();
- count_pmc(1, sample_period);
-
dump_ebb_state();
event_close(&event);
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_freeze_test.c b/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_freeze_test.c
index dcd351d203289..9ae795ce314e6 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_freeze_test.c
+++ b/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_freeze_test.c
@@ -99,8 +99,6 @@ int cycles_with_freeze(void)
ebb_global_disable();
ebb_freeze_pmcs();
- count_pmc(1, sample_period);
-
dump_ebb_state();
printf("EBBs while frozen %d\n", ebbs_while_frozen);
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test.c b/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test.c
index 94c99c12c0f23..4b45a2e70f62b 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test.c
+++ b/tools/testing/selftests/powerpc/pmu/ebb/cycles_with_mmcr2_test.c
@@ -71,8 +71,6 @@ int cycles_with_mmcr2(void)
ebb_global_disable();
ebb_freeze_pmcs();
- count_pmc(1, sample_period);
-
dump_ebb_state();
event_close(&event);
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/ebb.c b/tools/testing/selftests/powerpc/pmu/ebb/ebb.c
index dfbc5c3ad52d7..21537d6eb6b7d 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/ebb.c
+++ b/tools/testing/selftests/powerpc/pmu/ebb/ebb.c
@@ -396,8 +396,6 @@ int ebb_child(union pipe read_pipe, union pipe write_pipe)
ebb_global_disable();
ebb_freeze_pmcs();
- count_pmc(1, sample_period);
-
dump_ebb_state();
event_close(&event);
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/ebb_on_willing_child_test.c b/tools/testing/selftests/powerpc/pmu/ebb/ebb_on_willing_child_test.c
index ca2f7d729155b..b208bf6ad58d3 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/ebb_on_willing_child_test.c
+++ b/tools/testing/selftests/powerpc/pmu/ebb/ebb_on_willing_child_test.c
@@ -38,8 +38,6 @@ static int victim_child(union pipe read_pipe, union pipe write_pipe)
ebb_global_disable();
ebb_freeze_pmcs();
- count_pmc(1, sample_period);
-
dump_ebb_state();
FAIL_IF(ebb_state.stats.ebb_count == 0);
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/lost_exception_test.c b/tools/testing/selftests/powerpc/pmu/ebb/lost_exception_test.c
index ac3e6e182614a..ba2681a12cc7b 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/lost_exception_test.c
+++ b/tools/testing/selftests/powerpc/pmu/ebb/lost_exception_test.c
@@ -75,7 +75,6 @@ static int test_body(void)
ebb_freeze_pmcs();
ebb_global_disable();
- count_pmc(4, sample_period);
mtspr(SPRN_PMC4, 0xdead);
dump_summary_ebb_state();
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/multi_counter_test.c b/tools/testing/selftests/powerpc/pmu/ebb/multi_counter_test.c
index b8242e9d97d2d..791d37ba327b5 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/multi_counter_test.c
+++ b/tools/testing/selftests/powerpc/pmu/ebb/multi_counter_test.c
@@ -70,13 +70,6 @@ int multi_counter(void)
ebb_global_disable();
ebb_freeze_pmcs();
- count_pmc(1, sample_period);
- count_pmc(2, sample_period);
- count_pmc(3, sample_period);
- count_pmc(4, sample_period);
- count_pmc(5, sample_period);
- count_pmc(6, sample_period);
-
dump_ebb_state();
for (i = 0; i < 6; i++)
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/multi_ebb_procs_test.c b/tools/testing/selftests/powerpc/pmu/ebb/multi_ebb_procs_test.c
index a05c0e18ded63..9b0f70d597020 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/multi_ebb_procs_test.c
+++ b/tools/testing/selftests/powerpc/pmu/ebb/multi_ebb_procs_test.c
@@ -61,8 +61,6 @@ static int cycles_child(void)
ebb_global_disable();
ebb_freeze_pmcs();
- count_pmc(1, sample_period);
-
dump_summary_ebb_state();
event_close(&event);
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/pmae_handling_test.c b/tools/testing/selftests/powerpc/pmu/ebb/pmae_handling_test.c
index 153ebc92234fd..2904c741e04e5 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/pmae_handling_test.c
+++ b/tools/testing/selftests/powerpc/pmu/ebb/pmae_handling_test.c
@@ -82,8 +82,6 @@ static int test_body(void)
ebb_global_disable();
ebb_freeze_pmcs();
- count_pmc(1, sample_period);
-
dump_ebb_state();
if (mmcr0_mismatch)
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/pmc56_overflow_test.c b/tools/testing/selftests/powerpc/pmu/ebb/pmc56_overflow_test.c
index eadad75ed7e6f..b29f8ba22d1e6 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/pmc56_overflow_test.c
+++ b/tools/testing/selftests/powerpc/pmu/ebb/pmc56_overflow_test.c
@@ -76,8 +76,6 @@ int pmc56_overflow(void)
ebb_global_disable();
ebb_freeze_pmcs();
- count_pmc(2, sample_period);
-
dump_ebb_state();
printf("PMC5/6 overflow %d\n", pmc56_overflowed);
--
2.25.1
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