sdm: Avoid fb_id creation and removal in each frame

- Cache the <handle_id, fb_id> map in SDM layer.
- Registry finds the handle_id in layer map. If it is found, then
  mapped fb_id is programmed to DRM driver. Else fb_id is created
  and it is added in map for the given handle_id key. This map is
  cleared and fb_ids are removed, when the SDM layer gets deleted.
- "vendor.display.disable_fbid_cache" system prop needs to be set
  to disable the fb_id caching in SDM. So, fb_id will be removed
  and created for each SDM layer in every draw cycle.

CRs-Fixed: 2235202
Change-Id: I1d6c7fbc1fc5c1f9afad36cf49f17bc8c5322fe5

3 files changed, 13 insertions, 0 deletions

diff --git a/sdm/include/core/buffer_allocator.h b/sdm/include/core/buffer_allocator.h
index 6d77bcde..6731b770 100644
--- a/sdm/include/core/buffer_allocator.h
+++ b/sdm/include/core/buffer_allocator.h
@@ -70,6 +70,7 @@ struct AllocatedBufferInfo {
   uint32_t aligned_height = 0;   //!< Specifies aligned allocated buffer height in pixels.
   LayerBufferFormat format = kFormatInvalid;  // Specifies buffer format for allocated buffer.
   uint32_t size = 0;             //!< Specifies the size of the allocated buffer.
+  uint64_t id = 0;               //!< Specifies the Id of the allocated buffer.
 };
 
 /*! @brief Holds the information about the input/output configuration of an output buffer.
diff --git a/sdm/include/core/layer_buffer.h b/sdm/include/core/layer_buffer.h
index 649dda4a..28a7497b 100644
--- a/sdm/include/core/layer_buffer.h
+++ b/sdm/include/core/layer_buffer.h
@@ -278,6 +278,7 @@ struct LayerBuffer {
   UbwcCrStatsVector  ubwc_crstats[NUM_UBWC_CR_STATS_LAYERS] = {};
                                 //! < UBWC Compression ratio,stats. Stored as a vector of pair of
                                 //! of (tile size, #of tiles)
+  uint64_t handle_id = 0;
 };
 
 // This enum represents buffer layout types.
@@ -287,6 +288,11 @@ enum BufferLayout {
   kTPTiled    //!< Tightly Packed data
 };
 
+class LayerBufferObject {
+public:
+  virtual ~LayerBufferObject() {};
+};
+
 }  // namespace sdm
 
 #endif  // __LAYER_BUFFER_H__
diff --git a/sdm/include/core/layer_stack.h b/sdm/include/core/layer_stack.h
index 3dd1c6f4..ae82bda3 100644
--- a/sdm/include/core/layer_stack.h
+++ b/sdm/include/core/layer_stack.h
@@ -36,6 +36,7 @@
 
 #include <vector>
 #include <utility>
+#include <unordered_map>
 
 #include "layer_buffer.h"
 #include "sdm_types.h"
@@ -304,6 +305,10 @@ struct LayerSolidFill {
   uint32_t alpha = 0;      //!< Alpha value
 };
 
+struct LayerBufferMap {
+  std::unordered_map<uint64_t, std::shared_ptr<LayerBufferObject>> buffer_map;
+};
+
 /*! @brief This structure defines display layer object which contains layer properties and a drawing
   buffer.
 
@@ -376,6 +381,7 @@ struct Layer {
   Lut3d lut_3d = {};                               //!< o/p - Populated by SDM when tone mapping is
                                                    //!< needed on this layer.
   LayerSolidFill solid_fill_info = {};             //!< solid fill info along with depth.
+  std::shared_ptr<LayerBufferMap> buffer_map = nullptr;  //!< Map of handle_id and fb_id.
 };
 
 /*! @brief This structure defines a layer stack that contains layers which need to be composed and