gpu-top: Correct computation of ring size

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/tools/intel_gpu_top.c b/tools/intel_gpu_top.c
index d586c65..19fa0e9 100644 (file)
--- a/tools/intel_gpu_top.c
+++ b/tools/intel_gpu_top.c
@@ -292,7 +292,7 @@ print_percentage_bar(float percent, int cur_line_len)
 struct ring {
        const char *name;
        uint32_t mmio;
-       uint32_t head, tail, size;
+       int head, tail, size;
        uint64_t full;
        int idle;
 };
@@ -332,7 +332,7 @@ static uint32_t ring_read(struct ring *ring, uint32_t reg)
 static void ring_init(struct ring *ring)
 {
        gen6_force_wake_get();
-       ring->size = ((ring_read(ring, RING_LEN) & RING_NR_PAGES) >> 12) * 4096;
+       ring->size = (((ring_read(ring, RING_LEN) & RING_NR_PAGES) >> 12) + 1) * 4096;
        gen6_force_wake_put();
 }