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selftests/powerpc: EBB selftest for MMCR0 control for PMU SPRs in ISA v3.1

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With the MMCR0 control bit (PMCCEXT) in ISA v3.1, read access to
group B registers is restricted when MMCR0 PMCC=0b00. In other
platforms (like power9), the older behaviour works where group B
PMU SPRs are readable.

Patch creates a selftest which verifies that the test takes a
SIGILL when attempting to read PMU registers via helper function
"dump_ebb_state" for ISA v3.1.

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com <mailto:rnsastry@linux.ibm.com>>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1621950703-1532-3-git-send-email-atrajeev@linux.vnet.ibm.com
This commit is contained in:
Athira Rajeev
2021-05-25 09:51:43 -04:00
committed by Michael Ellerman
parent 45677c9aeb
commit d81090ed44
2 changed files with 64 additions and 1 deletions
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2
tools/testing/selftests/powerpc/pmu/ebb/Makefile
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@@ -24,7 +24,7 @@ TEST_GEN_PROGS := reg_access_test event_attributes_test cycles_test \
fork_cleanup_test ebb_on_child_test \
ebb_on_willing_child_test back_to_back_ebbs_test \
lost_exception_test no_handler_test \
cycles_with_mmcr2_test
cycles_with_mmcr2_test regs_access_pmccext_test
top_srcdir = ../../../../../..
include ../../../lib.mk