From d2247b240320157ee8c9a2346f05ae48a9de7a36 Mon Sep 17 00:00:00 2001
From: Han Gao <gaohan@iscas.ac.cn>
Date: Sat, 20 Jul 2024 15:44:28 +0800
Subject: [PATCH] vidmem: implement dma_buf_ops release to free buffers

This commit implement dma_buf_ops release to free buffer
in function _dmabuf_release(struct dma_buf *dmabuf).

Default use  pr_debug for dynamic debug in macro DEBUG_PRINT.

Signed-off-by: xianbing Zhu <xianbing.zhu@linux.alibaba.com>
Change-Id: Id0a5841ccf8459c469034866dd2878e8698a57a4
Signed-off-by: Han Gao <gaohan@iscas.ac.cn>
---
 .../video/video_memory/driver/video_memory.c  | 25 +++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/drivers/video/video_memory/driver/video_memory.c b/drivers/video/video_memory/driver/video_memory.c
index 0ecb5d31c..0f8112926 100644
--- a/drivers/video/video_memory/driver/video_memory.c
+++ b/drivers/video/video_memory/driver/video_memory.c
@@ -184,6 +184,7 @@
 #ifndef VIDMEM_DEBUG
 #define DEBUG_PRINT(...) \
   do {                     \
+        pr_debug(__VA_ARGS__);\
   } while (0)
 #else
 #undef DEBUG_PRINT
@@ -205,7 +206,7 @@ struct mem_block
     bool is_vi_mem;
     bool cache_en;
     void *va;
-
+    struct file *filp;
     union
     {
         /* Pointer to a array of pages. */
@@ -261,6 +262,11 @@ getPhysical(
     IN unsigned int Offset,
     OUT unsigned long * Physical
     );
+void
+GFP_Free(
+    IN struct file *filp,
+    IN unsigned long bus_address
+    );
 
 static struct file_node * find_and_delete_file_node(struct file *filp)
 {
@@ -701,6 +707,20 @@ OnError:
 
 static void _dmabuf_release(struct dma_buf *dmabuf)
 {
+    struct mem_block *memBlk = dmabuf->priv;
+    unsigned long physical;
+
+    if (!memBlk)
+        return;
+    if(!memBlk->filp)
+    {
+        DEBUG_PRINT("[vidmem] %s, %d: memBlk filp null\n", __func__, __LINE__);
+        return;
+    }
+    getPhysical(memBlk, 0, &physical);
+    DEBUG_PRINT("[vidmem] %s, %d: free physical %llx\n", __func__, __LINE__,physical);
+    GFP_Free(memBlk->filp,physical);
+
 }
 
 static void *_dmabuf_kmap(struct dma_buf *dmabuf, unsigned long offset)
@@ -749,6 +769,7 @@ DMABUF_Export(
     }
 
     memBlk = &mnode->memBlk;
+    memBlk->filp = filp;
 
     dmabuf = memBlk->dmabuf;
     if (dmabuf == NULL)
@@ -818,7 +839,7 @@ DMABUF_Import(
     }
 
     memBlk = &mnode->memBlk;
-
+    memBlk->filp = filp;
     /* Import dma buf handle. */
     memBlk->dmabuf = dma_buf_get(FD);
     if (!memBlk->dmabuf)