[Intel-gfx] [PATCH v3] drm/i915: Optimistically spin for the request completion

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5941
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -7              274/274              267/274
ILK                                  301/301              301/301
SNB                 -1              277/277              276/277
IVB                                  341/341              341/341
BYT                                  287/287              287/287
HSW                                  360/360              360/360
BDW                                  308/308              308/308
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gem_fence_thrash_bo-write-verify-none      PASS(4)      FAIL(1)PASS(1)
*PNV  igt_gem_fence_thrash_bo-write-verify-x      PASS(4)      FAIL(1)PASS(1)
*PNV  igt_gem_fence_thrash_bo-write-verify-y      PASS(4)      FAIL(1)PASS(1)
 PNV  igt_gem_userptr_blits_coherency-sync      CRASH(5)PASS(4)      CRASH(1)PASS(1)
 PNV  igt_gem_userptr_blits_coherency-unsync      CRASH(1)PASS(3)      CRASH(1)PASS(1)
 PNV  igt_gen3_render_linear_blits      FAIL(3)PASS(4)      FAIL(1)PASS(1)
 PNV  igt_gen3_render_mixed_blits      FAIL(3)PASS(4)      FAIL(2)
*SNB  igt_gem_mmap_gtt_write-read      PASS(2)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'