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perf/x86/amd: Support PERF_SAMPLE_{WEIGHT|WEIGHT_STRUCT}

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IbsDcMissLat indicates the number of clock cycles from when a miss is
detected in the data cache to when the data was delivered to the core.
Similarly, IbsTagToRetCtr provides number of cycles from when the op
was tagged to when the op was retired. Consider these fields for
sample->weight.

Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220928095805.596-5-ravi.bangoria@amd.com
This commit is contained in:
Ravi Bangoria 2022-09-28 15:27:54 +05:30 committed by Peter Zijlstra
parent 7c10dd0a88
commit 6b2ae4952e
1 changed files with 16 additions and 1 deletions
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17
arch/x86/events/amd/ibs.c
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@ -955,6 +955,7 @@ static void perf_ibs_parse_ld_st_data(__u64 sample_type,
{
union ibs_op_data3 op_data3;
union ibs_op_data2 op_data2;
union ibs_op_data op_data;
data->data_src.val = PERF_MEM_NA;
op_data3.val = ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSOPDATA3)];
@ -970,6 +971,19 @@ static void perf_ibs_parse_ld_st_data(__u64 sample_type,
perf_ibs_get_data_src(ibs_data, data, &op_data2, &op_data3);
data->sample_flags |= PERF_SAMPLE_DATA_SRC;
}
if (sample_type & PERF_SAMPLE_WEIGHT_TYPE && op_data3.dc_miss &&
data->data_src.mem_op == PERF_MEM_OP_LOAD) {
op_data.val = ibs_data->regs[ibs_op_msr_idx(MSR_AMD64_IBSOPDATA)];
if (sample_type & PERF_SAMPLE_WEIGHT_STRUCT) {
data->weight.var1_dw = op_data3.dc_miss_lat;
data->weight.var2_w = op_data.tag_to_ret_ctr;
} else if (sample_type & PERF_SAMPLE_WEIGHT) {
data->weight.full = op_data3.dc_miss_lat;
}
data->sample_flags |= PERF_SAMPLE_WEIGHT_TYPE;
}
}
static int perf_ibs_get_offset_max(struct perf_ibs *perf_ibs, u64 sample_type,
@ -977,7 +991,8 @@ static int perf_ibs_get_offset_max(struct perf_ibs *perf_ibs, u64 sample_type,
{
if (sample_type & PERF_SAMPLE_RAW ||
(perf_ibs == &perf_ibs_op &&
sample_type & PERF_SAMPLE_DATA_SRC))
(sample_type & PERF_SAMPLE_DATA_SRC ||
sample_type & PERF_SAMPLE_WEIGHT_TYPE)))
return perf_ibs->offset_max;
else if (check_rip)
return 3;