[Intel-gfx] [PATCH] drm/i915: Allow userptr backchannel for passing aroung GTT mappings

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 6123
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -1              272/272              271/272
ILK                 -1              302/302              301/302
SNB                 -1              303/303              302/303
IVB                 -1              338/338              337/338
BYT                 -2              287/287              285/287
HSW                 -1              361/361              360/361
BDW                 -1              308/308              307/308
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt at gem_userptr_blits@invalid-gtt-mapping      PASS(2)      FAIL(2)
*ILK  igt at gem_userptr_blits@invalid-gtt-mapping      PASS(2)      FAIL(2)
*SNB  igt at gem_userptr_blits@invalid-gtt-mapping      PASS(2)      FAIL(2)
*IVB  igt at gem_userptr_blits@invalid-gtt-mapping      PASS(2)      FAIL(2)
*BYT  igt at gem_exec_bad_domains@conflicting-write-domain      PASS(15)      FAIL(1)PASS(1)
*BYT  igt at gem_userptr_blits@invalid-gtt-mapping      PASS(2)      FAIL(2)
*HSW  igt at gem_userptr_blits@invalid-gtt-mapping      PASS(2)      FAIL(2)
*BDW  igt at gem_userptr_blits@invalid-gtt-mapping      PASS(2)      FAIL(2)
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