perf bpf filter: Add data_src sample data support

The data_src has many entries to express memory behaviors.  Add each
term separately so that users can combine them for their purpose.

I didn't add prefix for the constants for simplicity as they are mostly
distinguishable but I had to use l1_miss and l2_hit for mem_dtlb since
mem_lvl has different values for the same names.  Note that I decided
mem_lvl to be used as an alias of mem_lvlnum as it's deprecated now.
According to the comment in the UAPI header, users should use the mix of
mem_lvlnum, mem_remote and mem_snoop.  Also the SNOOPX bits are
concatenated to mem_snoop for simplicity.

The following terms are used for data_src and the corresponding perf
sample data fields:

 * mem_op : { load, store, pfetch, exec }
 * mem_lvl: { l1, l2, l3, l4, cxl, io, any_cache, lfb, ram, pmem }
 * mem_snoop: { none, hit, miss, hitm, fwd, peer }
 * mem_remote: { remote }
 * mem_lock: { locked }
 * mem_dtlb { l1_hit, l1_miss, l2_hit, l2_miss, any_hit, any_miss, walk, fault }
 * mem_blk { by_data, by_addr }
 * mem_hops { hops0, hops1, hops2, hops3 }

We can now use a filter expression like below:

  'mem_op == load, mem_lvl <= l2, mem_dtlb == l1_hit'
  'mem_dtlb == l2_miss, mem_hops > hops1'
  'mem_lvl == ram, mem_remote == 1'

Note that 'na' is shared among the terms as it has the same value except
for mem_lvl.  I don't have a good idea to handle that for now.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Hao Luo <haoluo@google.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@arm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Song Liu <song@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20230314234237.3008956-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/tools/perf/util/bpf_skel/sample_filter.bpf.c b/tools/perf/util/bpf_skel/sample_filter.bpf.c
index d930401c5bfc..88dbc788d257 100644
--- a/tools/perf/util/bpf_skel/sample_filter.bpf.c
+++ b/tools/perf/util/bpf_skel/sample_filter.bpf.c
@@ -70,6 +70,29 @@ static inline __u64 perf_get_sample(struct bpf_perf_event_data_kern *kctx,
 		return kctx->data->code_page_size;
 	case PERF_SAMPLE_DATA_PAGE_SIZE:
 		return kctx->data->data_page_size;
+	case PERF_SAMPLE_DATA_SRC:
+		if (entry->part == 1)
+			return kctx->data->data_src.mem_op;
+		if (entry->part == 2)
+			return kctx->data->data_src.mem_lvl_num;
+		if (entry->part == 3) {
+			__u32 snoop = kctx->data->data_src.mem_snoop;
+			__u32 snoopx = kctx->data->data_src.mem_snoopx;
+
+			return (snoopx << 5) | snoop;
+		}
+		if (entry->part == 4)
+			return kctx->data->data_src.mem_remote;
+		if (entry->part == 5)
+			return kctx->data->data_src.mem_lock;
+		if (entry->part == 6)
+			return kctx->data->data_src.mem_dtlb;
+		if (entry->part == 7)
+			return kctx->data->data_src.mem_blk;
+		if (entry->part == 8)
+			return kctx->data->data_src.mem_hops;
+		/* return the whole word */
+		return kctx->data->data_src.val;
 	default:
 		break;
 	}