fdo-mirrors/mesa-drm
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/drm.git synced 2025-12-24 05:30:13 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

openchrome: Further deferred fencing tweaks.

Browse source
This commit is contained in:
Thomas Hellstrom 2009-03-05 08:49:26 +01:00
parent 780e793629
commit cb2416e1a2
1 changed files with 18 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
linux-core/openchrome/via_ttm_fence.c
View file

@ -207,8 +207,20 @@ enum hrtimer_restart via_ttm_fence_timer_func(struct hrtimer *timer)
}
/**
* Since emitting a sequence blit after each command submission has a
* negative performance impact, we defer that emission until fence flushing.
* Openchrome fence flushing:
*
* Fence flushing means making sure that waiting fences of a particular
* fence class will eventually signal completely.
*
* On Openchrome that has nothing to do with GPU cache flushing. Instead
* fence flushing involves the following operations:
*
* 1) If the fence sequence has not yet been emitted to the command stream
* "(deferred fencing)", make sure that it is.
* 2) If the fence type indicates use of either HighQualityVideo or
* Mpeg engines, Block further command submission to these engines to make
* sure that they eventually signal idle. This is done using the
* "barrier" functionality in via_execbuf. (To be implemented.)
*/
static void via_ttm_fence_flush(struct ttm_fence_device *fdev,
@ -221,18 +233,14 @@ static void via_ttm_fence_flush(struct ttm_fence_device *fdev,
mutex_lock(&dev_priv->cmdbuf_mutex);
sequence = atomic_read(&dev_priv->fence_seq[VIA_ENGINE_CMD]);
via_emit_fence_seq_standalone(dev_priv, VIA_FENCE_OFFSET_CMD,
sequence);
DRM_INFO("Flushing fence 0x%08x\n", (unsigned) sequence);
if (sequence != atomic_read(&dev_priv->emitted_cmd_seq))
via_emit_fence_seq_standalone(dev_priv,
VIA_FENCE_OFFSET_CMD,
sequence);
mutex_unlock(&dev_priv->cmdbuf_mutex);
}
}
/**
* If the fence sequence is higher than what we've actually put in the
* command stream, indicate that we need to flush this fence type.
*/
static uint32_t via_ttm_fence_needed_flush(struct ttm_fence_object *fence)
{
struct ttm_fence_device *fdev = fence->fdev;