[PATCH i-g-t v2 16/21] gputop: Add support to drm-cycles/drm-total-cycles

[Lucas De Marchi]

Add support for using only GPU timestamps to calculate the utilization.
It uses drm-cycles and drm-total-cycles read from fdinfo. For any
2 samples, the utilization is calculated as:

	         u[i+1] - u[i]
	pct  = -----------------
	        Gt[i+1] - Gt[i]

with u == drm-cycles and Gt == drm-total-cycles.

Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 tools/gputop.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/tools/gputop.c b/tools/gputop.c
index bca7f4bc7..9edb76acc 100644
--- a/tools/gputop.c
+++ b/tools/gputop.c
@@ -208,8 +208,16 @@ print_client(struct igt_drm_client *c, struct igt_drm_client **prevc,
 		if (!c->engines->capacity[i])
 			continue;
 
-		pct = (double)c->u[i].delta_busy / period_us / 1e3 * 100 /
-		      c->engines->capacity[i];
+		switch (c->dcut) {
+		case DCUT_ENGINE_TIME:
+			pct = (double)c->u[i].delta_busy / period_us / 1e3 * 100 /
+				c->engines->capacity[i];
+			break;
+		case DCUT_GPU_TOTAL_CYCLES:
+			pct = (double)c->u[i].delta_busy / c->u[i].delta_total_cycles * 100 /
+				c->engines->capacity[i];
+			break;
+		}
 
 		/*
 		 * Guard against fluctuations between our scanning period and
-- 
2.43.0