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selftests/powerpc/pmu: Add support for branch sampling in get_intr_regs function

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Add support for sample type as PERF_SAMPLE_BRANCH_STACK in sampling
tests. This change is a precursor/helper for sampling testcases, that
test branck stack feature in perf interface.

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220610134113.62991-5-atrajeev@linux.vnet.ibm.com
This commit is contained in:
Kajol Jain 2022-06-10 19:10:42 +05:30 committed by Michael Ellerman
parent 50d9c30a68
commit 61d8990031
1 changed files with 20 additions and 1 deletions
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21
tools/testing/selftests/powerpc/pmu/sampling_tests/misc.c
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@ -259,13 +259,32 @@ u64 *get_intr_regs(struct event *event, void *sample_buff)
u64 *intr_regs;
size_t size = 0;
if ((type ^ PERF_SAMPLE_REGS_INTR))
if ((type ^ (PERF_SAMPLE_REGS_INTR | PERF_SAMPLE_BRANCH_STACK)) &&
(type ^ PERF_SAMPLE_REGS_INTR))
return NULL;
intr_regs = (u64 *)perf_read_first_sample(sample_buff, &size);
if (!intr_regs)
return NULL;
if (type & PERF_SAMPLE_BRANCH_STACK) {
/*
* PERF_RECORD_SAMPLE and PERF_SAMPLE_BRANCH_STACK:
* struct {
* struct perf_event_header hdr;
* u64 number_of_branches;
* struct perf_branch_entry[number_of_branches];
* u64 data[];
* };
* struct perf_branch_entry {
* u64 from;
* u64 to;
* u64 misc;
* };
*/
intr_regs += ((*intr_regs) * 3) + 1;
}
/*
* First entry in the sample buffer used to specify
* PERF_SAMPLE_REGS_ABI_64, skip perf regs abi to access