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Sandybdrige requires an elaborate dance to flush caches without
hanging the gpu. See public docs Vol2Part1 1.7.4.1 PIPE_CONTROL
or the corrensponding code in mesa/kernel.
This (together with the corresponding patch for the kernel) seems to
fix the hangs in cairo-perf-traces I'm seeing on my snb machine.
v2: Incorporate review from Chris Wilson. For paranoia keep all three
PIPE_CONTROL cmds in the same batchbuffer to avoid upsetting the gpu.
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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This gets display and 2D blit acceleration up and running. No Render
acceleration is provided yet.
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Currently, we require that a batch containing a dirty bo be submitted
before we mark the device as requiring a flush. So if we never submit a
batch between block handlers, we can end up sleeping without ever
flushing either the partial batch or the rendering to the scanout.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=36776
Tested-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Daniel Vetter pointed out that the automagic flush by the kernel for the
busy-ioctl was only introduced upstream in 2.6.37. So we still need to
manually emit a flush on old kernels.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Rather than just creating and submitting a batch that simply contains a
flush in order to periodically ensure that rendering reaches the
scanout, we can simply ask the kernel whether the scanout is busy. The
kernel will then submit a flush on our behalf if it is dirty, which
takes advantage of the kernel's dirty state tracking.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Reduce the number of relocations emitted by only emitting one relocation
per vertex element per vertex buffer.
References: https://bugs.freedesktop.org/show_bug.cgi?id=35733
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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And remove the vestigal wait upon changing crtc as this is more properly
done in the kernel.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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A perennial problem we have is the accursed WAIT_FOR_EVENT hangs, which
occur when we switch the framebuffer before the WAIT_FOR_EVENT completes
and upsets the GPU.
We have tried more subtle approaches to detected these and fix them up in
the kernel, to no avail. What we need to do is to delay the framebuffer
flip until the WAIT completes, which is quite tricky in the kernel
without new ioctls and round-trips. Instead, apply the big hammer from
userspace and synchronise all rendering before changing the framebuffer.
I expect this not to cause noticeable latency on switching modes (far
less than the actual modeswitch) and should stop these hangs once and
for all.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=31401 (...)
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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gen6+ platform has a BLT engine with seperate
command streamer to support BLT commands.
Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
[ickle: merge trivial conflict]
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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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>
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