perf arm-spe: Add support for SPE Data Source packet on AmpereOne

Decode SPE Data Source packets on AmpereOne. The field is IMPDEF.

Reviewed-by: Leo Yan <[e-mail]>
Signed-off-by: Ilkka Koskinen <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Graham Woodward <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: John Garry <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Mike Leach <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/arm-spe-decoder/arm-spe-decoder.h

···
 	ARM_SPE_COMMON_DS_DRAM		= 0xe,
 };
 
+enum arm_spe_ampereone_data_source {
+	ARM_SPE_AMPEREONE_LOCAL_CHIP_CACHE_OR_DEVICE    = 0x0,
+	ARM_SPE_AMPEREONE_SLC                           = 0x3,
+	ARM_SPE_AMPEREONE_REMOTE_CHIP_CACHE             = 0x5,
+	ARM_SPE_AMPEREONE_DDR                           = 0x7,
+	ARM_SPE_AMPEREONE_L1D                           = 0x8,
+	ARM_SPE_AMPEREONE_L2D                           = 0x9,
+};
+
 struct arm_spe_record {
 	enum arm_spe_sample_type type;
 	int err;

tools/perf/util/arm-spe.c

···
 	{},
 };
 
+static const struct midr_range ampereone_ds_encoding_cpus[] = {
+	MIDR_ALL_VERSIONS(MIDR_AMPERE1A),
+	{},
+};
+
 static void arm_spe__sample_flags(struct arm_spe_queue *speq)
 {
 	const struct arm_spe_record *record = &speq->decoder->record;
···
 	}
 }
 
+/*
+ * Source is IMPDEF. Here we convert the source code used on AmpereOne cores
+ * to the common (Neoverse, Cortex) to avoid duplicating the decoding code.
+ */
+static void arm_spe__synth_data_source_ampereone(const struct arm_spe_record *record,
+						 union perf_mem_data_src *data_src)
+{
+	struct arm_spe_record common_record;
+
+	switch (record->source) {
+	case ARM_SPE_AMPEREONE_LOCAL_CHIP_CACHE_OR_DEVICE:
+		common_record.source = ARM_SPE_COMMON_DS_PEER_CORE;
+		break;
+	case ARM_SPE_AMPEREONE_SLC:
+		common_record.source = ARM_SPE_COMMON_DS_SYS_CACHE;
+		break;
+	case ARM_SPE_AMPEREONE_REMOTE_CHIP_CACHE:
+		common_record.source = ARM_SPE_COMMON_DS_REMOTE;
+		break;
+	case ARM_SPE_AMPEREONE_DDR:
+		common_record.source = ARM_SPE_COMMON_DS_DRAM;
+		break;
+	case ARM_SPE_AMPEREONE_L1D:
+		common_record.source = ARM_SPE_COMMON_DS_L1D;
+		break;
+	case ARM_SPE_AMPEREONE_L2D:
+		common_record.source = ARM_SPE_COMMON_DS_L2;
+		break;
+	default:
+		pr_warning_once("AmpereOne: Unknown data source (0x%x)\n",
+				record->source);
+		return;
+	}
+
+	common_record.op = record->op;
+	arm_spe__synth_data_source_common(&common_record, data_src);
+}
+
 static const struct data_source_handle data_source_handles[] = {
 	DS(common_ds_encoding_cpus, data_source_common),
+	DS(ampereone_ds_encoding_cpus, data_source_ampereone),
 };
 
 static void arm_spe__synth_memory_level(const struct arm_spe_record *record,