linux-stable.git/tools/testing/selftests/powerpc/pmu/sampling_tests/Makefile, branch master

selftests/powerpc/pmu: Add interface test for extended reg support

2025-02-11T06:03:51+00:00

The testcase uses check_extended_regs_support and
perf_get_platform_reg_mask function to check if the
platform has extended reg support. This will help to
check if sampling pmu selftest is enabled or not for
a given platform.

Signed-off-by: Kajol Jain 
Signed-off-by: Athira Rajeev 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20250113075858.45137-4-atrajeev@linux.vnet.ibm.com

selftests/powerpc: Add flags.mk to support pmu buildable

2024-04-29T13:53:01+00:00

When running `make -C powerpc/pmu run_tests` from top level selftests
directory, currently this error is being reported:

  make: Entering directory '/home/maddy/linux/tools/testing/selftests/powerpc/pmu'
  Makefile:40: warning: overriding recipe for target 'emit_tests'
  ../../lib.mk:111: warning: ignoring old recipe for target 'emit_tests'
  gcc -m64    count_instructions.c ../harness.c event.c lib.c ../utils.c loop.S  -o /home/maddy/selftest_output//count_instructions
  In file included from count_instructions.c:13:
  event.h:12:10: fatal error: utils.h: No such file or directory
  12 | #include "utils.h"
    |          ^~~~~~~~~
  compilation terminated.

This is due to missing of include path in CFLAGS. That is, CFLAGS and
GIT_VERSION macros are defined in the powerpc/ folder Makefile which
in this case is not involved.

To address the failure in case of executing specific sub-folder test
directly, a new rule file has been addded by the patch called "flags.mk"
under selftest/powerpc/ folder and is linked to all the Makefile of
powerpc/pmu sub-folders.

Reported-by: Sachin Sant 
Signed-off-by: Madhavan Srinivasan 
Tested-by: Sachin Sant 
[mpe: Fixup ifeq, make GIT_VERSION simply expanded to avoid re-executing git describe]
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20240229093711.581230-2-maddy@linux.ibm.com

selftests/powerpc: Re-order *FLAGS to follow lib.mk

2024-04-29T13:51:16+00:00

In some powerpc/ sub-folder Makefiles, CFLAGS are defined before lib.mk
include. Clean it up by re-ordering the flags to follow after the mk
include. This is needed to support sub-folders in powerpc/ buildable on
its own.

Signed-off-by: Madhavan Srinivasan 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20240229093711.581230-1-maddy@linux.ibm.com

selftests/powerpc/pmu: Add interface test for bhrb disable field for non-branch samples

2022-06-28T22:57:42+00:00

The testcase uses "instructions" event to generate the samples and fetch
Monitor Mode Control Register A (MMCRA) when overflow. Branch History
Rolling Buffer(bhrb) disable bit is part of MMCRA which need to be
verified by perf interface. Incase sample is not of branch type, bhrb
disable bit is explicitly set to 1. Testcase checks if the bhrb disable
bit is set of MMCRA register via perf interface for ISA v3.1 platform

Signed-off-by: Kajol Jain 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220610134113.62991-15-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add selftest for mmcr1 pmcxsel/unit/cache fields

2022-06-28T22:57:42+00:00

The testcase uses event code "0x21c040" to verify the settings for
different fields in Monitor Mode Control Register 1 (MMCR1). The fields
include PMCxSEL, PMCXCOMB PMCxUNIT, cache. Checks if these fields are
translated correctly via perf interface to MMCR1

Signed-off-by: Athira Rajeev 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220610134113.62991-14-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add selftest for checking valid and invalid bhrb filter maps

2022-06-28T22:57:42+00:00

For PERF_SAMPLE_BRANCH_STACK sample type, different branch_sample_type,
ie branch filters are supported. All the branch filters are not
supported in powerpc. Example, power10 platform supports any, ind_call
and cond branch filters. Whereas, it is different in power9. Testcase
checks event open for invalid and valid branch sample types. The branch
types for testcase are picked from "perf_branch_sample_type" in
perf_event.h

Signed-off-by: Athira Rajeev 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220610134113.62991-13-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add selftest to check PERF_SAMPLE_REGS_INTR option will not crash on any platforms

2022-06-28T22:57:42+00:00

With sampling, --intr-regs option is used for capturing
interrupt regs. When --intr-regs option is used, PMU code
uses is_sier_available() function which uses PMU flags in
the code. In environment where platform specific PMU is
not registered, PMU flags is not defined. A fix was added
in kernel to address crash while accessing is_sier_available()
function when pmu is not set. commit f75e7d73bdf7 ("powerpc/perf:
Fix crash with is_sier_available when pmu is not set").

Add perf sampling test to exercise this code and make sure
enabling intr_regs shouldn't crash in any platform. Testcase
uses software event cycles since software event will work even
in cases without PMU.

Signed-off-by: Athira Rajeev 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220610134113.62991-12-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add selftest to check branch stack enablement will not crash on any platforms

2022-06-28T22:57:42+00:00

While enabling branch stack for an event, BHRB (Branch History
Rolling Buffer) filter is set using bhrb_filter_map() callback.
This callback is not defined for cases like generic_compat_pmu
or in case where there is no PMU registered. A fix was added
in kernel to address a crash issue observed while enabling branch
stack for environments which doesn't have this callback.
commit b460b512417a ("powerpc/perf: Fix crashes with
generic_compat_pmu & BHRB").

Add perf sampling test to exercise this code path and make
sure enabling branch stack shouldn't crash in any platform.
Testcase uses software event cycles since software event is
available and can be used even in cases without PMU.

Signed-off-by: Athira Rajeev 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220610134113.62991-11-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add interface test for bhrb disable field

2022-06-28T13:57:56+00:00

The testcase uses "instructions" event to generate the
samples and fetch Monitor Mode Control Register A (MMCRA)
when overflow. Branch History Rolling Buffer(bhrb) disable bit
is part of MMCRA which need to be verified by perf interface.
Testcase checks if the bhrb disable bit of MMCRA register is
programmed correctly via perf interface for ISA v3.1 platform
Also make get_mmcra_ifm return type as u64.

Signed-off-by: Kajol Jain 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220610134113.62991-9-atrajeev@linux.vnet.ibm.com

selftests/powerpc/pmu: Add interface test for mmcra_ifm field for conditional branch type

2022-06-28T13:57:56+00:00

The testcase uses "instructions" event to check if the
Instruction filtering mode(IFM) bits are programmed correctly
for conditional branch type. Testcase checks if IFM bits is
programmed correctly to Monitor Mode Control Register A (MMCRA)
via perf interface for ISA v3.1 platform.

Signed-off-by: Kajol Jain 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220610134113.62991-8-atrajeev@linux.vnet.ibm.com