drm/i915: Handle pagefaults in execbuffer user relocations

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Currently if we hit a pagefault when applying a user relocation for the
execbuffer, we bail and return EFAULT to the application. Instead, we
need to unwind, drop the dev->struct_mutex, copy all the relocation
entries to a vmalloc array (to avoid any potential circular deadlocks
when resolving the pagefault), retake the mutex and then apply the
relocations.  Afterwards, we need to again drop the lock and copy the
vmalloc array back to userspace.

v2: Incorporate feedback from Daniel Vetter.

Reported-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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This commit is contained in:

Chris Wilson

2010-11-21 22:07:12 +00:00

parent da79de97d2

commit bcf50e2775

1 changed files with 303 additions and 178 deletions

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drivers/gpu/drm/i915/i915_gem.c

+303 -178

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