forked from Minki/linux
b1ed35d917
The fence registers are clobbered by a GPU reset. If there is concurrent user access to a fenced region via a GTT mmaping, the access will not be fenced during the reset (until we restore the fences afterwards). In order to prevent invalid access during the reset, before we clobber the fences first we must invalidate the GTT mmapings. Access to the mmap will then be forced to fault in the page, and in handling the fault, i915_gem_fault() will take the struct_mutex and wait upon the reset to complete. v2: Fix up commentary. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99274 Testcase: igt/gem_mmap_gtt/hang Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/20170104145110.1486-1-chris@chris-wilson.co.uk Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> |
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