drm/i915: Perform object clflushing asynchronously

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Flushing the cachelines for an object is slow, can be as much as 100ms
for a large framebuffer. We currently do this under the struct_mutex BKL
on execution or on pageflip. But now with the ability to add fences to
obj->resv for both flips and execbuf (and we naturally wait on the fence
before CPU access), we can move the clflush operation to a workqueue and
signal a fence for completion, thereby doing the work asynchronously and
not blocking the driver or its clients.

v2: Introduce i915_gem_clflush.h and use a new name, split out some
extras into separate patches.

Suggested-by: Akash Goel <akash.goel@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170222114049.28456-5-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2017-02-22 11:40:48 +00:00

parent f6aaba4dfb

commit 57822dc6b9

7 changed files with 264 additions and 72 deletions

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1

drivers/gpu/drm/i915/Makefile

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2

drivers/gpu/drm/i915/i915_drv.h

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54

drivers/gpu/drm/i915/i915_gem.c

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189

drivers/gpu/drm/i915/i915_gem_clflush.c

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37

drivers/gpu/drm/i915/i915_gem_clflush.h

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9

drivers/gpu/drm/i915/i915_gem_execbuffer.c

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44

drivers/gpu/drm/i915/intel_display.c

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