• Jackie Li's avatar
    drm/i915: Implement dynamic GuC WOPCM offset and size calculation · 6b0478fb
    Jackie Li authored
    Hardware may have specific restrictions on GuC WOPCM offset and size. On
    Gen9, the value of the GuC WOPCM size register needs to be larger than the
    value of GuC WOPCM offset register + a Gen9 specific offset (144KB) for
    reserved GuC WOPCM. Fail to enforce such a restriction on GuC WOPCM size
    will lead to GuC firmware execution failures. On the other hand, with
    current static GuC WOPCM offset and size values (512KB for both offset and
    size), the GuC WOPCM size verification will fail on Gen9 even if it can be
    fixed by lowering the GuC WOPCM offset by calculating its value based on
    HuC firmware size (which is likely less than 200KB on Gen9), so that we can
    have a GuC WOPCM size value which is large enough to pass the GuC WOPCM
    size check.
    
    This patch updates the reserved GuC WOPCM size for RC6 context on Gen9 to
    24KB to strictly align with the Gen9 GuC WOPCM layout. It also adds support
    to verify the GuC WOPCM size aganist the Gen9 hardware restrictions. To
    meet all above requirements, let's provide dynamic partitioning of the
    WOPCM that will be based on platform specific HuC/GuC firmware sizes.
    
    v2:
     - Removed intel_wopcm_init (Ville/Sagar/Joonas)
     - Renamed and Moved the intel_wopcm_partition into intel_guc (Sagar)
     - Removed unnecessary function calls (Joonas)
     - Init GuC WOPCM partition as soon as firmware fetching is completed
    
    v3:
     - Fixed indentation issues (Chris)
     - Removed layering violation code (Chris/Michal)
     - Created separat files for GuC wopcm code  (Michal)
     - Used inline function to avoid code duplication (Michal)
    
    v4:
     - Preset the GuC WOPCM top during early GuC init (Chris)
     - Fail intel_uc_init_hw() as soon as GuC WOPCM partitioning failed
    
    v5:
     - Moved GuC DMA WOPCM register updating code into intel_wopcm.c
     - Took care of the locking status before writing to GuC DMA
       Write-Once registers. (Joonas)
    
    v6:
     - Made sure the GuC WOPCM size to be multiple of 4K (4K aligned)
    
    v8:
     - Updated comments and fixed naming issues (Sagar/Joonas)
     - Updated commit message to include more description about the hardware
       restriction on GuC WOPCM size (Sagar)
    
    v9:
     - Minor changes variable names and code comments (Sagar)
     - Added detailed GuC WOPCM layout drawing (Sagar/Michal)
     - Refined macro definitions to be reader friendly (Michal)
     - Removed redundent check to valid flag (Michal)
     - Unified first parameter for exported GuC WOPCM functions (Michal)
     - Refined the name and parameter list of hardware restriction checking
       functions (Michal)
    
    v10:
     - Used shorter function name for internal functions (Joonas)
     - Moved init-ealry function into c file (Joonas)
     - Consolidated and removed redundant size checks (Joonas/Michal)
     - Removed unnecessary unlikely() from code which is only called once
       during boot (Joonas)
     - More fixes to kernel-doc format and content (Michal)
     - Avoided the use of PAGE_MASK for 4K pages (Michal)
     - Added error log messages to error paths (Michal)
    
    v11:
     - Replaced intel_guc_wopcm with more generic intel_wopcm and attached
       intel_wopcm to drm_i915_private instead intel_guc (Michal)
     - dynamic calculation of GuC non-wopcm memory start (a.k.a WOPCM Top
       offset from GuC WOPCM base) (Michal)
     - Moved WOPCM marco definitions into .c source file (Michal)
     - Exported WOPCM layout diagram as kernel-doc (Michal)
    
    v12:
     - Updated naming, function kernel-doc to align with new changes (Michal)
    
    v13:
     - Updated the ordering of s-o-b/cc/r-b tags (Sagar)
     - Corrected one tense error in comment (Sagar)
     - Corrected typos and removed spurious comments (Joonas)
    
    Bspec: 12690
    Signed-off-by: default avatarJackie Li <yaodong.li@intel.com>
    Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
    Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
    Cc: Sujaritha Sundaresan <sujaritha.sundaresan@intel.com>
    Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
    Cc: John Spotswood <john.a.spotswood@intel.com>
    Cc: Oscar Mateo <oscar.mateo@intel.com>
    Cc: Chris Wilson <chris@chris-wilson.co.uk>
    Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
    Reviewed-by: Sagar Arun Kamble <sagar.a.kamble@intel.com> (v8)
    Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> (v9)
    Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com> (v11)
    Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> (v12)
    Reviewed-by: default avatarJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
    Signed-off-by: default avatarJoonas Lahtinen <joonas.lahtinen@linux.intel.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/1520987574-19351-2-git-send-email-yaodong.li@intel.com
    6b0478fb
intel_wopcm.c 5.51 KB