The basis for the constraints are what we can map into the aperture for
direct writing with the CPU, so use the size of the mappable region as
opposed to the size of the total GTT.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
There are still too many unresolved bugs, typically GPU hangs, that are
related to using relaxed fencing (i.e. only allocating the minimal
amount of memory required for a buffer) on older hardware, so turn off
the feature by default for the release.
Reported-and-tested-by: Knut Petersen <Knut_Petersen@t-online.de>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=36147
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
So that you can indeed allocate a linear framebuffer if you so desire
without breaking mesa.
Adds:
Section "Driver"
Option "LinearFramebuffer" "False|True" # default false
EndSection
to xorg.conf
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
We emitted this message as an error even though we fallback and attempt
to allocate a non-tiled framebuffer before failing (with an appropriate
error message).
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
If we are tiled, we may fail the allocation due to an EIO and so not
being able to set tiling. Try again with an untiled request in this
case.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
An attempt to workaround the incoherency in gen2 chipsets, we avoid
using dynamic reallocation as much as possible.
The first step is to disable allocation of pixmaps using GEM and simply
create them in system memory without a backing buffer object. This
forces all rendering to use S/W fallbacks.
The second step is to allocate a shadow front buffer and assign that to
the Screen pixmap. This ensure that the front buffer remains in the GTT
and pinned for scanout. The shadow buffer will be rendered to in the
normal fashion via the Screen pixmap, and be marked dirty. In the block
handler, the dirty shadow buffer is then blitted (using the GPU) over
the front buffer. This should completely avoid having to move pages
around in the GTT and avoid incurring the wrath of those early chipsets.
Secondly, performance should be reasonable as we avoid the ping-pong
caused by the small aperture and weak GPU forcing software fallbacks.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
If we reject the front buffer because it has too large a stride, repeat
the allocation using untiled for the cases where we can utilize laxer
hardware restrictions.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
After splitting out the i810 driver into its own legacy directory, we
can identify the common routines not as i830 but as intel. This
clarifies the code which *is* i830 specific.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Chris Wilson
Matt Turner