[Intel-gfx] [PATCH 1/1] drm/i915: Add debugfs tunable for forcewake hysteresis

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5640
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  353/353              353/353
ILK                 -1              329/329              328/329
SNB                                  400/422              400/422
IVB              +2                 485/487              487/487
BYT                                  296/296              296/296
HSW              +1-1              507/508              507/508
BDW                                  401/402              401/402
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*ILK  igt_gem_ringfill_blitter      PASS(1, M26)      INIT(1, M26)
 IVB  igt_gem_pwrite_pread_snooped-pwrite-blt-cpu_mmap-performance      DMESG_WARN(2, M34)PASS(2, M4)      PASS(1, M34)
 IVB  igt_gem_storedw_batches_loop_normal      DMESG_WARN(2, M34M4)PASS(4, M34M4M21)      PASS(1, M34)
*HSW  igt_gem_pwrite_pread_display-copy-performance      PASS(2, M40)      DMESG_WARN(1, M40)
 HSW  igt_gem_pwrite_pread_snooped-pwrite-blt-cpu_mmap-performance      DMESG_WARN(1, M40)PASS(5, M40M20)      PASS(1, M40)
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