These are treated by the core drawing routines as replacements for the
front-buffer attached to Windows, and so expect the usual BLT
accelerations are available, for example overlapping blits to handle
scrolling. If we create these pixmaps with Y-tiling and then they are
pinned by the external compositor we are forced to perform a double copy
through the 3D pipeline as it does not handle overlapping blits and the
BLT does not handle Y-tiling.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Only marginally better than falling all the way back to using the CPU,
is to perform a double copy to workaround the overlapping copy.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Short-cut the determination of whether it can be tiled and accelerated
-- we know it can't! This is mainly to cleanup the debug logs.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
In the READ==0 case we know that the region does not intersect damage
because we have just subtracted, and checking the intersection causes us
to immediately apply the subtraction operation defeating the
optimisation and forcing the expensive operation each time.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Only those that point into scratch memory need to synchronized before
control is handed back to the client.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Mark the end of a sequence of CPU operations and force the decision to
map again to be based on the current upload operation.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
If the last operation was on the GPU, continue on the GPU if this
operation overlaps any GPU damage or does not overlap CPU damage.
Otherwise, if the last operation was on the CPU only switch to the GPU
if we do not overlap any CPU damage and overlap existing GPU damage.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
As we now can accelerate most of the common core drawing operations, we
can create GPU bo for accelerated drawing on first use without undue
fear of readbacks. This benefits Qt especially which heavily uses core
the drawing operations.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
The theory being that we will also require cache space to copy from when
uploading into the shadow.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
UXA now also uses pixman_triangle_t in order for its fallback, so we
need to bump the required pixman version for UXA as well as SNA.
Reported-by: Fabio Pedretti <fabio.ped@libero.it>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=43946
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
When mixing operations and switching between GTT and CPU mappings we
need to restore the original CPU shadow rather than accidentally
overwrite.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
A missing check before emitting a dword into the batch opened up the
possibility of overflowing the batch and corrupting our state.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Prefer to reuse an available CPU mapping which are considered precious
and reaped if we keep too many unused entries availabled.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
That the rq is NULL when on the flushing list is no longer true, but
now it points to the static request instead.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
As we may free a purged bo whilst iterating, we need to keep the next bo
as a local member.
Include the debugging that led to this find.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
After we find a single bo that has been evicted from our cache, the
kernel is likely to have evicted many more so check our caches for any
more bo to reap.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
If there are no VMA that might become inactive, there is no point
scanning the inactive lists if we are searching for VMA.
This prevents the regression in firefox-fishbowl whilst maintaining most
of the improvement with PutComposite.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Try to recycle vma by first trying to populate the inactive list before
scanning for a vma bo to harvest.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
If we are going to transfer GPU damage back to the CPU bo, then we can
reuse an active buffer and so improve the recycling.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
In order to avoid conflating whether a bo was marked purgeable with its
retained state, we need to carefully handle the errors from madv.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
If we incurred a context switch to the BLT in order to prepare the
target (uploading damage for instance), we should recheck whether we can
continue the operation on the BLT rather than force a switch back to
RENDER.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
If we need to halt the 3D engine in order to flush the pipeline for a
dirty source, we may as well re-evaluate whether we can use the BLT
instead.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
If we will need to extract either the source or the destination, we
should see if we can do the entire operation on the BLT.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
As for PutImage, if the damage will be immediately flushed out to the
GPU bo, we may as well do the write directly to the GPU bo and not
staged via the shadow.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
One issue with the heuristic is that it is based on total pixmap size
whereas the goal is to pick the placement for the next series of
operations. The next step in refinement is to combine an overall
placement to avoid frequent migrations along with a per-operation
override.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
When the pixmap is large, larger than L2 cache size, we are unlikely to
benefit from first copying the data to a shadow buffer -- as that shadow
buffer itself will mostly reside in main memory. In such circumstances
we may as perform the write to the GTT mapping of the GPU bo. As such,
it is a fragile heuristic that may require further tuning.
Avoiding that extra copy gives a 30% boost to putimage500/shmput500 at
~10% cost to putimage10/shmput10 on Atom (945gm/PineView), without any
noticeable impact upon cairo.
Reported-by: Michael Larabel <Michael@phoronix.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
In order to avoid having to perform a copy of the cacheable buffer into
GPU space, we can map a bo as cacheable and write directly to its
contents. This is only a win on systems that can avoid the clflush, and
also we have to go to greater measures to avoid unnecessary
serialisation upon that CPU bo. Sadly, we do not yet go to enough length
to avoid negatively impacting ShmPutImage, but that does not appear to
be a artefact of stalling upon a CPU buffer.
Note, LLC is a SandyBridge feature enabled by default in kernel 3.1 and
later. In time, we should be able to expose similar support for
snoopable buffers for other generations.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Chris Wilson