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Whenever we want to unbind a vma, we must wait on all GPU activity to complete first. (This is what gives us the ability to do fine grained eviction and purging by only having to wait on the VMA that we need to unbind to proceed; though if pushed we can make it a rule that we are only allowed to unbind already idle VMA and move the burden of the work and organising the sleep onto the caller.) Currently, we might only sleep if the vma is still active on the GPU, but in principle i915_vma_unbind() always implies a sleep, so mark it up with a might_sleep(). Suggested-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> References: https://bugs.freedesktop.org/show_bug.cgi?id=103638 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Matthew Auld <matthew.william.auld@gmail.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171109213450.13875-2-chris@chris-wilson.co.uk
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.