[RFC PATCH 1/1] drm/amdgpu: fix usable gart size calculation

[Nirmoy Das]

amdgpu_do_test_moves() is failing because of wrong
usable gart size calculation and throwing:

[drm:amdgpu_do_test_moves [amdgpu]] *ERROR* 0000000020bdc9f3 bind failed

Signed-off-by: Nirmoy Das <nirmoy.das at amd.com>
---

This still doesn't work. As per my calculation 1st 4MB of GART is not
accounted for in adev->gmc.gart_size - atomic64_read(&adev->gart_pin_size).
What am I missing ?

 drivers/gpu/drm/amd/amdgpu/amdgpu_test.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_test.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_test.c
index 6042b3b81a4c..d983c729997f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_test.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_test.c
@@ -42,16 +42,9 @@ static void amdgpu_do_test_moves(struct amdgpu_device *adev)
 	size = 1024 * 1024;

 	/* Number of tests =
-	 * (Total GTT - IB pool - writeback page - ring buffers) / test size
+	 * (Total GTT - gart_pin_size) / test size
 	 */
-	n = adev->gmc.gart_size - AMDGPU_IB_POOL_SIZE;
-	for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
-		if (adev->rings[i])
-			n -= adev->rings[i]->ring_size;
-	if (adev->wb.wb_obj)
-		n -= AMDGPU_GPU_PAGE_SIZE;
-	if (adev->irq.ih.ring_obj)
-		n -= adev->irq.ih.ring_size;
+	n = adev->gmc.gart_size - atomic64_read(&adev->gart_pin_size);
 	n /= size;

 	gtt_obj = kcalloc(n, sizeof(*gtt_obj), GFP_KERNEL);
--
2.29.0