drivers/gpu/drm/i915/gt/intel_mocs.h

   1 /*
   2  * Copyright (c) 2015 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23
  24 #ifndef INTEL_MOCS_H
  25 #define INTEL_MOCS_H
  26
  27 /**
  28  * DOC: Memory Objects Control State (MOCS)
  29  *
  30  * Motivation:
  31  * In previous Gens the MOCS settings was a value that was set by user land as
  32  * part of the batch. In Gen9 this has changed to be a single table (per ring)
  33  * that all batches now reference by index instead of programming the MOCS
  34  * directly.
  35  *
  36  * The one wrinkle in this is that only PART of the MOCS tables are included
  37  * in context (The GFX_MOCS_0 - GFX_MOCS_64 and the LNCFCMOCS0 - LNCFCMOCS32
  38  * registers). The rest are not (the settings for the other rings).
  39  *
  40  * This table needs to be set at system start-up because the way the table
  41  * interacts with the contexts and the GmmLib interface.
  42  *
  43  *
  44  * Implementation:
  45  *
  46  * The tables (one per supported platform) are defined in intel_mocs.c
  47  * and are programmed in the first batch after the context is loaded
  48  * (with the hardware workarounds). This will then let the usual
  49  * context handling keep the MOCS in step.
  50  */
  51
  52 struct intel_engine_cs;
  53 struct intel_gt;
  54
  55 void intel_mocs_init(struct intel_gt *gt);
  56 void intel_mocs_init_engine(struct intel_engine_cs *engine);
  57
  58 #endif