1. 13 Feb, 2021 1 commit
    • Matt Roper's avatar
      drm/i915: FPGA_DBG is display-specific · a321c3c6
      Matt Roper authored
      Although the bspec's description doesn't make it very clear, the
      hardware architects have confirmed that the FPGA_DBG register that we
      use to check for unclaimed MMIO accesses is display-specific and will
      only properly flag unclaimed MMIO transactions for registers in the
      display range.  If a platform doesn't have display, FPGA_DBG itself will
      not be available and should not be checked.  Let's move the feature flag
      into intel_device_info.display to more accurately reflect this.
      
      Given that we now know FPGA_DBG is display-specific, it could be argued
      that we should only check it on out intel_de_*() functions.  However
      let's not make that change right now; keeping the checks in all of the
      existing locations still helps us catch cases where regular
      intel_uncore_*() functions use bad MMIO offset math / base addresses and
      accidentally wind up landing within an unused area within the display
      MMIO range.  It will also help catch cases where userspace-initiated
      MMIO (e.g., IGT's intel_reg tool) attempt to read bad offsets within the
      display range.
      
      v2:  Add missing hunk with the update to the HAS_FPGA_DBG_UNCLAIMED
           macro.  (CI)
      
      Cc: Lucas De Marchi <lucas.demarchi@intel.com>
      Signed-off-by: default avatarMatt Roper <matthew.d.roper@intel.com>
      Reviewed-by: default avatarLucas De Marchi <lucas.demarchi@intel.com>
      Link: https://patchwork.freedesktop.org/patch/msgid/20210212222049.3516344-1-matthew.d.roper@intel.com
      a321c3c6
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