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  1. Sep 16, 2020
    • Jordan Crouse's avatar
      drm/msm: Allow a5xx to mark the RPTR shadow as privileged · 8907afb4
      Jordan Crouse authored
      
      
      Newer microcode versions have support for the CP_WHERE_AM_I opcode which
      allows the RPTR shadow memory to be marked as privileged to protect it
      from corruption. Move the RPTR shadow into its own buffer and protect it
      it if the current microcode version supports the new feature.
      
      We can also re-enable preemption for those targets that support
      CP_WHERE_AM_I. Start out by preemptively assuming that we can enable
      preemption and disable it in a5xx_hw_init if the microcode version comes
      back as too old.
      
      Signed-off-by: default avatarJordan Crouse <jcrouse@codeaurora.org>
      Signed-off-by: default avatarRob Clark <robdclark@chromium.org>
      8907afb4
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