1. 17 Apr, 2020 1 commit
    • Yan Zhao's avatar
      drm/i915/gvt: skip populate shadow context if guest context not changed · fb55c735
      Yan Zhao authored
      Software is not expected to populate engine context except when using
      restore inhibit bit or golden state to initialize it for the first time.
      
      Therefore, if a newly submitted guest context is the same as the last
      shadowed one, no need to populate its engine context from guest again.
      
      Currently using lrca + ring_context_gpa to identify whether two guest
      contexts are the same.
      
      The reason of why context id is not included as an identifier is that
      i915 recently changed the code and context id is only unique for a
      context when OA is enabled. And when OA is on, context id is generated
      based on lrca. Therefore, in that case, if two contexts are of the same
      lrca, they have identical context ids as well.
      (This patch also works with old guest kernel like 4.20.)
      
      for guest context, if its ggtt entry is modified after last context
      shadowing, it is also deemed as not the same context as last shadowed one.
      
      v7:
      -removed local variable "valid". use the one in s->last_ctx diretly
      
      v6:
      -change type of lrca of last ctx to be u32. as currently it's all
      protected by vgpu lock (Kevin Tian)
      -reset valid of last ctx to false once it needs to be repopulated before
      population completes successfully (Kevin Tian)
      
      v5:
      -merge all 3 patches into one patch  (Zhenyu Wang)
      
      v4:
      - split the series into 3 patches.
      - don't turn on optimization until last patch in this series (Kevin Tian)
      - define lrca to be atomic in this patch rather than update its type in
      the second patch (Kevin Tian)
      
      v3: updated commit message to describe engine context and context id
      clearly (Kevin Tian)
      v2: rebased to 5.6.0-rc4+Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
      Reviewed-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
      Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
      Cc: Kevin Tian <kevin.tian@intel.com>
      Suggested-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
      Signed-off-by: default avatarYan Zhao <yan.y.zhao@intel.com>
      Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
      Link: http://patchwork.freedesktop.org/patch/msgid/20200417091334.32628-1-yan.y.zhao@intel.com
      fb55c735
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