[PATCH i-g-t 07/12] lib/igt_drm_fdinfo: Parse unit for engine utilization

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

Kernel adds a " ns" at the end of engine utilization. Make sure we parse
it so we don't fail if there's another suitable unit chosen by the
driver or another format.

This prepares the ground for xe driver which will use 2 timestamps
rather than 1 with a different unit, to make sure it's compatible with
SR-IOV so we don't have to handle the conversion between GPU and CPU
clock domains.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 lib/igt_drm_fdinfo.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/lib/igt_drm_fdinfo.c b/lib/igt_drm_fdinfo.c
index 5f05f210e..1541a62c9 100644
--- a/lib/igt_drm_fdinfo.c
+++ b/lib/igt_drm_fdinfo.c
@@ -63,9 +63,10 @@ static const char *ignore_space(const char *s)
 
 static int parse_engine(const char *name, struct drm_client_fdinfo *info,
 			const char **name_map, unsigned int map_entries,
-			uint64_t *val)
+			uint64_t *val, const char **unit)
 {
 	const char *p;
+	char *end_ptr;
 	size_t name_len;
 	int found = -1;
 	unsigned int i;
@@ -103,8 +104,15 @@ static int parse_engine(const char *name, struct drm_client_fdinfo *info,
 		}
 	}
 
-	if (found >= 0)
-		*val = strtoull(p, NULL, 10);
+	if (found < 0)
+		return found;
+
+	*val = strtoull(p, &end_ptr, 10);
+	if (p == end_ptr)
+		return -1;
+
+	if (unit)
+		*unit = end_ptr;
 
 	return found;
 }
@@ -212,7 +220,7 @@ __igt_parse_drm_fdinfo(int dir, const char *fd, struct drm_client_fdinfo *info,
 	while ((l = strtok_r(_buf, "\n", &ctx))) {
 		uint64_t val = 0;
 		size_t keylen;
-		const char *v;
+		const char *v, *unit;
 		char *end_ptr;
 		int idx;
 
@@ -237,15 +245,15 @@ __igt_parse_drm_fdinfo(int dir, const char *fd, struct drm_client_fdinfo *info,
 			strncpy(info->pdev, v, sizeof(info->pdev) - 1);
 		} else if (strstartswith(l, "drm-engine-capacity-", &keylen)) {
 			idx = parse_engine(l + keylen, info,
-					   name_map, map_entries, &val);
+					   name_map, map_entries, &val, NULL);
 			if (idx >= 0) {
 				info->capacity[idx] = val;
 				num_capacity++;
 			}
 		} else if (strstartswith(l, "drm-engine-", &keylen)) {
 			idx = parse_engine(l + keylen, info,
-					   name_map, map_entries, &val);
-			if (idx >= 0) {
+					   name_map, map_entries, &val, &unit);
+			if (idx >= 0 && !strcmp(unit, " ns")) {
 				if (!info->capacity[idx])
 					info->capacity[idx] = 1;
 				info->busy[idx] = val;
-- 
2.44.0