[PATCH v6 2/2] drm/i915: Add soft-pinning API for execbuffer

[Chris Wilson]

On Wed, Sep 09, 2015 at 04:07:09PM +0200, Michał Winiarski wrote:
> From: Chris Wilson <chris at chris-wilson.co.uk>
> 
> Userspace can pass in an offset that it presumes the object is located
> at. The kernel will then do its utmost to fit the object into that
> location. The assumption is that userspace is handling its own object
> locations (for example along with full-ppgtt) and that the kernel will
> rarely have to make space for the user's requests.
> 
> v2: Fixed incorrect eviction found by Michal Winiarski - fix suggested by Chris
> Wilson.  Fixed incorrect error paths causing crash found by Michal Winiarski.
> (Not published externally)
> 
> v3: Rebased because of trivial conflict in object_bind_to_vm.  Fixed eviction
> to allow eviction of soft-pinned objects when another soft-pinned object used
> by a subsequent execbuffer overlaps reported by Michal Winiarski.
> (Not published externally)
> 
> v4: Moved soft-pinned objects to the front of ordered_vmas so that they are
> pinned first after an address conflict happens to avoid repeated conflicts in
> rare cases (Suggested by Chris Wilson).  Expanded comment on
> drm_i915_gem_exec_object2.offset to cover this new API.
> 
> v5: Added I915_PARAM_HAS_EXEC_SOFTPIN parameter for detecting this capability
> (Kristian). Added check for multiple pinnings on eviction (Akash). Made sure
> buffers are not considered misplaced without the user specifying
> EXEC_OBJECT_SUPPORTS_48BBADDRESS.  User must assume responsibility for any
> addressing workarounds.  Updated object2.offset field comment again to clarify
> NO_RELOC case (Chris).  checkpatch cleanup.
> 
> v6: Rebase on top of current nightly. Dropped any references to
> EXEC_OBJECT_SUPPORTS_48BBADDRESS since those don't exist in upstream
> yet, and are not a dependency.
> 
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Akash Goel <akash.goel at intel.com>
> Cc: Vinay Belgaumkar <vinay.belgaumkar at intel.com>
> Cc: Michal Winiarski <michal.winiarski at intel.com>
> Cc: Zou Nanhai <nanhai.zou at intel.com>
> Cc: Kristian Høgsberg <hoegsberg at gmail.com>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: Thomas Daniel <thomas.daniel at intel.com>
> Signed-off-by: Michał Winiarski <michal.winiarski at intel.com>

Again, the precursors are not included in this series or upstream, so
NAK.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre