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batchbuffer > aperture size.
So with compiz on Intel hw with fake bufmgr, opening 4 firefox windows at 1680x1050 and hitting alt-tab, could cause the batchbuffer to try and reference more than the 32MB of RAM allocated.
Fix 1:
Fix 1 is to pre-verify the list of buffers against the current batchbuffer and if it can't possibly fit in the aperture to flush the batchbuffer to the hardware
and try again. If the buffers still can't fit well then you are hosed as I'm not sure there is a nice way to tell anyone.
Fix 2:
Next problem was that even with a simple check for total < aperture, we ran
into fragmentation issues, this meant that half way down a set of buffers,
we would fail as no blocks were available. Fix this by nuking the memory
manager from orbit and letting it start again and relayout the blocks in a
manner that fits.
Fix 3:
Finally the initial problem we were seeing was a memcpy to a NULL backing store.
We seem to end up with a texture at some point that never gets mapped but ends up with data in it. compiz al-tab icons have this property. So I created a card dirty bit that memcpy's any buffer that is !static and is written to back to memory. This probably is wrong but it makes compiz work for now.
Caveats:
965 support is still fail.
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The uint64_t flags (as defined by drm.h) were being used as unsigned ints in
many places.
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This should restore gears speed on 9xx hardware
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remove unneeded entry points
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gears now runs for about 10-15 seconds with some artifacts before falling
over.
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This moves the relocations into the buffer manager in prepration for
a superioctl move.
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Now, allocations only take locations, rather than a variety of unused flags.
The only interesting flag before was the no_move/no_evict pair for scanout
and similar buffers, which the DRI drivers don't use. That will be readded
when we get to using this code for display buffer allocation, by adding a
pin/unpin call (dynamic pinning/unpinning may be useful for VT switching and
root window resizing).
This commit changes one instance of DRM_BO_FLAG_MEM_LOCAL with
DRM_BO_FLAG_MEM_TT, which appeared to have been unintentional.
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Conflicts:
src/mesa/drivers/dri/common/dri_bufmgr.c
src/mesa/drivers/dri/common/dri_drmpool.c
src/mesa/drivers/dri/i915tex/intel_batchpool.c
src/mesa/drivers/dri/i915tex/intel_buffer_objects.c
src/mesa/drivers/dri/i915tex/intel_regions.c
src/mesa/drivers/dri/i915tex/intel_screen.c
src/mesa/drivers/dri/i915tex/intel_screen.h
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The interface is not solid yet (some simplification to do still, and
adjustment for 0-copy), and the drivers are not converted. However, the new
interface allows using the same calls to support either a TTM or a classic
static allocation backend, with the static backend allowing a more limited
feature set.
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Don't place buffer objects on unfenced list when newly created.
Fix a buffer object wait-for-idle deadlock.
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