1. 26 5月, 2017 5 次提交
  2. 25 5月, 2017 1 次提交
    • J
      drm/i915: Serialize GTT/Aperture accesses on BXT · 0ef34ad6
      Jon Bloomfield 提交于
      BXT has a H/W issue with IOMMU which can lead to system hangs when
      Aperture accesses are queued within the GAM behind GTT Accesses.
      
      This patch avoids the condition by wrapping all GTT updates in stop_machine
      and using a flushing read prior to restarting the machine.
      
      The stop_machine guarantees no new Aperture accesses can begin while
      the PTE writes are being emmitted. The flushing read ensures that
      any following Aperture accesses cannot begin until the PTE writes
      have been cleared out of the GAM's fifo.
      
      Only FOLLOWING Aperture accesses need to be separated from in flight
      PTE updates. PTE Writes may follow tightly behind already in flight
      Aperture accesses, so no flushing read is required at the start of
      a PTE update sequence.
      
      This issue was reproduced by running
      	igt/gem_readwrite and
      	igt/gem_render_copy
      simultaneously from different processes, each in a tight loop,
      with INTEL_IOMMU enabled.
      
      This patch was originally published as:
      	drm/i915: Serialize GTT Updates on BXT
      
      v2: Move bxt/iommu detection into static function
          Remove #ifdef CONFIG_INTEL_IOMMU protection
          Make function names more reflective of purpose
          Move flushing read into static function
      
      v3: Tidy up for checkpatch.pl
      
      Testcase: igt/gem_concurrent_blit
      Signed-off-by: NJon Bloomfield <jon.bloomfield@intel.com>
      Cc: John Harrison <john.C.Harrison@intel.com>
      Cc: Chris Wilson <chris@chris-wilson.co.uk>
      Cc: Daniel Vetter <daniel.vetter@intel.com>
      Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
      Link: http://patchwork.freedesktop.org/patch/msgid/1495641251-30022-1-git-send-email-jon.bloomfield@intel.comReviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com>
      Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
      0ef34ad6
  3. 24 5月, 2017 2 次提交
  4. 23 5月, 2017 2 次提交
  5. 22 5月, 2017 3 次提交
  6. 20 5月, 2017 1 次提交
  7. 19 5月, 2017 7 次提交
  8. 18 5月, 2017 13 次提交
  9. 17 5月, 2017 6 次提交