[PATCH 3/3] drm/i915: Documentation for multiple GGTT views.

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

A short section describing background, implementation and intended usage.

For: VIZ-4544
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 Documentation/DocBook/drm.tmpl      |  5 +++
 drivers/gpu/drm/i915/i915_gem_gtt.c | 61 +++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+)

diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index 56e2a9b..c975f26 100644
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -4033,6 +4033,11 @@ int num_ioctls;</synopsis>
 !Pdrivers/gpu/drm/i915/intel_lrc.c Logical Rings, Logical Ring Contexts and Execlists
 !Idrivers/gpu/drm/i915/intel_lrc.c
       </sect2>
+      <sect2>
+        <title>Global GTT views</title>
+!Pdrivers/gpu/drm/i915/i915_gem_gtt.c Global GTT views
+!Idrivers/gpu/drm/i915/i915_gem_gtt.c
+      </sect2>
     </sect1>
 
     <sect1>
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 02eabf9..633f063 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -30,6 +30,67 @@
 #include "i915_trace.h"
 #include "intel_drv.h"
 
+/**
+ * DOC: Global GTT views (GGTT)
+ *
+ * Background and previous state
+ *
+ * Historically objects could exists (be bound) in global GTT space only as
+ * singular instances with a view representing all of the object's backing pages
+ * in a linear fashion. This view will be called a normal view.
+ *
+ * To support multiple views of the same object, where the number of mapped
+ * pages is not equal to the backing store, or where the layout of the pages
+ * is not linear, concept of a GGTT view was added.
+ *
+ * One example of an alternative view is a stereo display driven by a single
+ * image. In this case we would have a framebuffer looking like this
+ * (2x2 pages):
+ *
+ *    12
+ *    34
+ *
+ * Above would represent a normal GGTT view as normally mapped for GPU or CPU
+ * rendering. In contrast, fed to the display engine would be an alternative
+ * view which could look something like this:
+ *
+ *   1212
+ *   3434
+ *
+ * In this example both the size and layout of pages in the alternative view is
+ * different from the normal view.
+ *
+ * Implementation and usage
+ *
+ * GGTT views are implemented using VMAs and are distinguished via enum
+ * i915_ggtt_view_type and struct i915_ggtt_view.
+ *
+ * A new flavour of core GEM functions which work with GGTT bound objects were
+ * added with the _view suffix. They take the struct i915_ggtt_view parameter
+ * encapsulating all metadata required to implement a view.
+ *
+ * As a helper for callers which are only interested in the normal view,
+ * globally const i915_ggtt_view_normal singleton instance exists. All old core
+ * GEM API functions, the ones not taking the view parameter, are operating on,
+ * or with the normal GGTT view.
+ *
+ * Code wanting to add or use a new GGTT view needs to:
+ *
+ * 1. Add a new enum.
+ * 2. Extend the metadata in the i915_ggtt_view structure if required.
+ * 3. Add support to i915_ggtt_view_pages().
+ *
+ * New views are required to build a throw-away scatter-gather table
+ * at the time they are bound into the GGTT space (3rd item from above). This is
+ * intended to simplify the code and is not considered a performance sensitive
+ * path at the moment.
+ *
+ * Core API is designed to have copy semantics which means that passed in
+ * struct i915_ggtt_view does not need to be persistent (left around after
+ * calling the core API functions).
+ *
+ */
+
 const struct i915_ggtt_view i915_ggtt_view_normal;
 
 static void bdw_setup_private_ppat(struct drm_i915_private *dev_priv);
-- 
2.1.1

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