video: driver: optimize buffer pool implementation

- Maintain free & busy pool to track buffers separately
- track double-free cases during msm_memory_free()
- track memory leak, by checking busy pool buffer count.
  it is expected to be zero at the end of a session.
- maintain common api's to init, alloc, free, destroy
  for all below buffer types.
    - struct msm_vidc_buffer
    - struct msm_vidc_alloc
    - struct msm_vidc_map
    - struct msm_vidc_timestamp.

Change-Id: Ib8655047c3883ea6601344661058d7a629ffd5bd
Signed-off-by: Govindaraj Rajagopal <grajagop@codeaurora.org>

driver/vidc/inc/msm_vidc_memory.h

@@ -7,7 +7,30 @@
 #define _MSM_VIDC_MEMORY_H_
 
 #include "msm_vidc_internal.h"
-#include "msm_vidc_core.h"
+
+struct msm_vidc_core;
+struct msm_vidc_inst;
+
+enum msm_memory_pool_type {
+	MSM_MEM_POOL_BUFFER  = 0,
+	MSM_MEM_POOL_MAP,
+	MSM_MEM_POOL_ALLOC,
+	MSM_MEM_POOL_TIMESTAMP,
+	MSM_MEM_POOL_MAX,
+};
+
+struct msm_memory_alloc_header {
+	struct list_head       list;
+	void                  *buf;
+};
+
+struct msm_memory_pool {
+	u32                    type;
+	u32                    size;
+	char                  *name;
+	struct list_head       free_pool; /* list of struct msm_memory_alloc_header */
+	struct list_head       busy_pool; /* list of struct msm_memory_alloc_header */
+};
 
 int msm_vidc_memory_alloc(struct msm_vidc_core *core,
 	struct msm_vidc_alloc *alloc);
@@ -19,5 +42,11 @@ int msm_vidc_memory_unmap(struct msm_vidc_core *core,
 	struct msm_vidc_map *map);
 struct dma_buf *msm_vidc_memory_get_dmabuf(int fd);
 void msm_vidc_memory_put_dmabuf(void *dmabuf);
+int msm_memory_pools_init(struct msm_vidc_inst *inst);
+void msm_memory_pools_deinit(struct msm_vidc_inst *inst);
+void *msm_memory_alloc(struct msm_vidc_inst *inst,
+	enum msm_memory_pool_type type);
+void msm_memory_free(struct msm_vidc_inst *inst,
+	enum msm_memory_pool_type type, void *vidc_buf);
 
 #endif // _MSM_VIDC_MEMORY_H_