Re: [PATCH 2/4] drm/radeon/kms: no need to align IB like this

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On 23.02.2012 18:00, Jerome Glisse wrote:

2012/2/23 Christian König <deathsimple@xxxxxxxxxxx>
So don't confuse devs by doing so.

Signed-off-by: Christian König <deathsimple@xxxxxxxxxxx>
---
 drivers/gpu/drm/radeon/r600.c |   15 +--------------
 1 files changed, 1 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 4f08e5e..4a4ac8f 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -2719,20 +2719,7 @@ int r600_ib_test(struct radeon_device *rdev, int ring)
       ib->ptr[0] = PACKET3(PACKET3_SET_CONFIG_REG, 1);
       ib->ptr[1] = ((scratch - PACKET3_SET_CONFIG_REG_OFFSET) >> 2);
       ib->ptr[2] = 0xDEADBEEF;
-       ib->ptr[3] = PACKET2(0);
-       ib->ptr[4] = PACKET2(0);
-       ib->ptr[5] = PACKET2(0);
-       ib->ptr[6] = PACKET2(0);
-       ib->ptr[7] = PACKET2(0);
-       ib->ptr[8] = PACKET2(0);
-       ib->ptr[9] = PACKET2(0);
-       ib->ptr[10] = PACKET2(0);
-       ib->ptr[11] = PACKET2(0);
-       ib->ptr[12] = PACKET2(0);
-       ib->ptr[13] = PACKET2(0);
-       ib->ptr[14] = PACKET2(0);
-       ib->ptr[15] = PACKET2(0);
-       ib->length_dw = 16;
+       ib->length_dw = 3;
       r = radeon_ib_schedule(rdev, ib);
       if (r) {
               radeon_scratch_free(rdev, scratch);
--
1.7.5.4


You sure about that ? I remember this helped with GPU lockup and i also seen fglrx aligning IB.
Yeah, pretty much. Well I searched for halve an hour for the corresponding IB alignment in mesa/the CS ioctl until I finally figured out that there isn't any.

So IBs submitted by usermode aren't aligned in any way.... So it really seems to work fine and I couldn't find any reason why we should align an IB for the GFX ring in our docs also.

Christian.
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