drm/i915: Allow multiple user handles to the same VM

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It was noted that we made the same mistake for VM_ID as for object
handles, whereby we ensured that we only allocated a single handle for
one ppgtt. This has the unfortunate consequence for userspace that they
need to reference count the handles to avoid destroying an active ID. If
we allow multiple handles to the same ppgtt, userspace can freely
unreference any handle they own without fear of destroying the same
handle in use elsewhere.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190425054333.27299-1-chris@chris-wilson.co.uk

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Chris Wilson 2019-04-25 06:43:33 +01:00

parent 8f2a1057d6

commit 1f2b4a7edb

2 changed files with 8 additions and 20 deletions

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26

drivers/gpu/drm/i915/i915_gem_context.c

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2

drivers/gpu/drm/i915/i915_gem_gtt.h

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