selftests/powerpc/pmu: Refactor the platform check and add macros to find array size/PVR

The platform check for selftest support "check_pvr_for_sampling_tests"
is specific to sampling tests which includes PVR check, presence of
PMU and extended regs support. Extended regs support is needed for
sampling tests which tests whether PMU registers are programmed
correctly. There could be other sampling tests which may not need
extended regs, example, bhrb filter tests which only needs validity
check via event open.

Hence refactor the platform check to have a common function
"platform_check_for_tests" that checks only for PVR check
and presence of PMU. The existing function
"check_pvr_for_sampling_tests" will invoke the common function
and also will include checks for extended regs specific for
sampling. The common function can also be used by tests other
than sampling like event code tests.

Add macro to find array size ("ARRAY_SIZE") to sampling
tests "misc.h" file. This can be used in next tests to
find event array size. Also update "include/reg.h" to
add macros to find minor and major version from PVR which
will be used in testcases.

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220610134113.62991-10-atrajeev@linux.vnet.ibm.com

1 files changed, 16 insertions, 4 deletions

diff --git a/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c
index 5a26fc3a9706..eac6420abdf1 100644
--- a/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c
+++ b/tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c
@@ -121,12 +121,10 @@ int check_extended_regs_support(void)
 	return -1;
 }
 
-int check_pvr_for_sampling_tests(void)
+int platform_check_for_tests(void)
 {
 	pvr = PVR_VER(mfspr(SPRN_PVR));
 
-	platform_extended_mask = perf_get_platform_reg_mask();
-
 	/*
 	 * Check for supported platforms
 	 * for sampling test
@@ -138,19 +136,33 @@ int check_pvr_for_sampling_tests(void)
 	 * Check PMU driver registered by looking for
 	 * PPC_FEATURE2_EBB bit in AT_HWCAP2
 	 */
-	if (!have_hwcap2(PPC_FEATURE2_EBB))
+	if (!have_hwcap2(PPC_FEATURE2_EBB) || !have_hwcap2(PPC_FEATURE2_ARCH_3_00))
 		goto out;
 
+	return 0;
+
+out:
+	printf("%s: Tests unsupported for this platform\n", __func__);
+	return -1;
+}
+
+int check_pvr_for_sampling_tests(void)
+{
+	SKIP_IF(platform_check_for_tests());
+
+	platform_extended_mask = perf_get_platform_reg_mask();
 	/* check if platform supports extended regs */
 	if (check_extended_regs_support())
 		goto out;
 
 	init_ev_encodes();
 	return 0;
+
 out:
 	printf("%s: Sampling tests un-supported\n", __func__);
 	return -1;
 }
+
 /*
  * Allocate mmap buffer of "mmap_pages" number of
  * pages.