[PATCH i-g-t v2 12/21] lib/igt_drm_fdinfo: Parse drm-total-cycles

[Lucas De Marchi <lucas.demarchi@intel.com>]

Parse drm-total-cycles and annotate what are the possible engine
utilization types that can be used. Currently there are 2 possible ways
to calculate utilization:

1) via drm-engine, that uses the time and derive the utilization by
   comparing to the CPU time
2) via drm-cycles + drm-total-cycles, that uses the GPU time

igt_drm_fdinfo just marks the presence of the keys, letting the caller
decide which method to use.

It is assumed that if any drm-engine, drm-cycles or drm-total-cycles is
available, it's available for all engines with non-zero utilization.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 lib/igt_drm_fdinfo.c | 9 +++++++++
 lib/igt_drm_fdinfo.h | 8 ++++++++
 2 files changed, 17 insertions(+)

diff --git a/lib/igt_drm_fdinfo.c b/lib/igt_drm_fdinfo.c
index 723e2e340..7a1485c66 100644
--- a/lib/igt_drm_fdinfo.c
+++ b/lib/igt_drm_fdinfo.c
@@ -218,6 +218,7 @@ __igt_parse_drm_fdinfo(int dir, const char *fd, struct drm_client_fdinfo *info,
 		       const char **name_map, unsigned int map_entries,
 		       const char **region_map, unsigned int region_entries)
 {
+	bool has_cycles = false, has_total_cycles = false;
 	bool regions_found[DRM_CLIENT_FDINFO_MAX_REGIONS] = { };
 	bool engines_found[DRM_CLIENT_FDINFO_MAX_ENGINES] = { };
 	unsigned int good = 0, num_capacity = 0;
@@ -264,10 +265,15 @@ __igt_parse_drm_fdinfo(int dir, const char *fd, struct drm_client_fdinfo *info,
 			idx = parse_engine(l + keylen, info,
 					   name_map, map_entries, &val);
 			UPDATE_ENGINE(idx, busy, val);
+			info->dcut |= DCUT_ENGINE_TIME;
 		} else if (strstartswith(l, "drm-cycles-", &keylen)) {
 			idx = parse_engine(l + keylen, info,
 					   name_map, map_entries, &val);
 			UPDATE_ENGINE(idx, cycles, val);
+		} else if (strstartswith(l, "drm-total-cycles-", &keylen)) {
+			idx = parse_engine(l + keylen, info,
+					   name_map, map_entries, &val);
+			UPDATE_ENGINE(idx, total_cycles, val);
 		} else if (strstartswith(l, "drm-total-", &keylen)) {
 			idx = parse_region(l + keylen, info,
 					   region_map, region_entries, &val);
@@ -294,6 +300,9 @@ __igt_parse_drm_fdinfo(int dir, const char *fd, struct drm_client_fdinfo *info,
 	if (good < 2 || (!info->num_engines && !info->num_regions))
 		return 0; /* fdinfo format not as expected */
 
+	if (has_cycles && has_total_cycles)
+		info->dcut |= DCUT_GPU_TOTAL_CYCLES;
+
 	return good + info->num_engines + num_capacity + info->num_regions;
 }
 
diff --git a/lib/igt_drm_fdinfo.h b/lib/igt_drm_fdinfo.h
index 17a47f94a..4fbd7fe08 100644
--- a/lib/igt_drm_fdinfo.h
+++ b/lib/igt_drm_fdinfo.h
@@ -41,6 +41,11 @@ struct drm_client_meminfo {
 	uint64_t active;
 };
 
+enum drm_client_utilization_type {
+	DCUT_ENGINE_TIME	= 1U << 0,
+	DCUT_GPU_TOTAL_CYCLES	= 1U << 1,
+};
+
 struct drm_client_fdinfo {
 	char driver[128];
 	char pdev[128];
@@ -51,10 +56,13 @@ struct drm_client_fdinfo {
 	unsigned int capacity[DRM_CLIENT_FDINFO_MAX_ENGINES];
 	char names[DRM_CLIENT_FDINFO_MAX_ENGINES][256];
 
+	enum drm_client_utilization_type dcut;
 	/* drm-engine-<engine> values */
 	uint64_t busy[DRM_CLIENT_FDINFO_MAX_ENGINES];
 	/* drm-cycles-<engine> values */
 	uint64_t cycles[DRM_CLIENT_FDINFO_MAX_ENGINES];
+	/* drm-total-cycles-<engine> values */
+	uint64_t total_cycles[DRM_CLIENT_FDINFO_MAX_ENGINES];
 
 	unsigned int num_regions;
 	unsigned int last_region_index;
-- 
2.43.0