drm/i915: Nuke struct_mutex from context_setparam

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Userspace should be free to race against itself and shoot itself in
the foot if it so desires to adjust a parameter at the same time as
submitting a batch to that context. As such, the struct_mutex in context
setparam is only being used to serialise userspace against itself and
not for any protection of internal structs and so is superfluous.

v2: Separate user_flags from internal flags to reduce chance of
interference; and use locked bit ops for user updates.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180911132206.23032-1-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2018-09-11 14:22:06 +01:00

parent 146cdf3fad

commit d3f3e5e438

3 changed files with 27 additions and 28 deletions

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20

drivers/gpu/drm/i915/i915_gem_context.c

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33

drivers/gpu/drm/i915/i915_gem_context.h

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2

drivers/gpu/drm/i915/i915_gem_execbuffer.c

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