mpp_runtime does not check the availability of dma devices instead only checks the availability of the device folder

[hbiyik]

in case no dma device is available, mpp thinks that dma allocator is still valid. I think it should check the availablity of at least one device device in dma devices.

here is a potential fix.

diff --git a/osal/allocator/allocator_dma_heap.c b/osal/allocator/allocator_dma_heap.c
index f2465af..828b22d 100644
--- a/osal/allocator/allocator_dma_heap.c
+++ b/osal/allocator/allocator_dma_heap.c
@@ -67,23 +67,6 @@
     RK_U32  flags;
 } allocator_ctx_dmaheap;

-typedef struct DmaHeapInfo_t {
-    const char  *name;
-    RK_S32      fd;
-    RK_U32      flags;
-} DmaHeapInfo;
-
-static DmaHeapInfo heap_infos[MPP_ALLOC_FLAG_TYPE_NB] = {
-    {   "system-uncached",          -1,                                                MPP_ALLOC_FLAG_NONE , },   /* 0 */
-    {   "system-uncached-dma32",    -1,                                                MPP_ALLOC_FLAG_DMA32, },   /* 1 */
-    {   "system",                   -1,                      MPP_ALLOC_FLAG_CACHABLE                       , },   /* 2 */
-    {   "system-dma32",             -1,                      MPP_ALLOC_FLAG_CACHABLE | MPP_ALLOC_FLAG_DMA32, },   /* 3 */
-    {   "cma-uncached",             -1, MPP_ALLOC_FLAG_CMA                                                 , },   /* 4 */
-    {   "cma-uncached-dma32",       -1, MPP_ALLOC_FLAG_CMA                           | MPP_ALLOC_FLAG_DMA32, },   /* 5 */
-    {   "cma",                      -1, MPP_ALLOC_FLAG_CMA | MPP_ALLOC_FLAG_CACHABLE                       , },   /* 6 */
-    {   "cma-dma32",                -1, MPP_ALLOC_FLAG_CMA | MPP_ALLOC_FLAG_CACHABLE | MPP_ALLOC_FLAG_DMA32, },   /* 7 */
-};
-
 static int try_open_path(const char *name)
 {
     static const char *heap_path = "/dev/dma_heap/";
diff --git a/osal/allocator/allocator_dma_heap.h b/osal/allocator/allocator_dma_heap.h
index 60f30f4..e7f5535 100644
--- a/osal/allocator/allocator_dma_heap.h
+++ b/osal/allocator/allocator_dma_heap.h
@@ -19,6 +19,23 @@

 #include "mpp_allocator_api.h"

+typedef struct DmaHeapInfo_t {
+    const char  *name;
+    RK_S32      fd;
+    RK_U32      flags;
+} DmaHeapInfo;
+
+static DmaHeapInfo heap_infos[MPP_ALLOC_FLAG_TYPE_NB] = {
+    {   "system-uncached",          -1,                                                MPP_ALLOC_FLAG_NONE , },   /* 0 */
+    {   "system-uncached-dma32",    -1,                                                MPP_ALLOC_FLAG_DMA32, },   /* 1 */
+    {   "system",                   -1,                      MPP_ALLOC_FLAG_CACHABLE                       , },   /* 2 */
+    {   "system-dma32",             -1,                      MPP_ALLOC_FLAG_CACHABLE | MPP_ALLOC_FLAG_DMA32, },   /* 3 */
+    {   "cma-uncached",             -1, MPP_ALLOC_FLAG_CMA                                                 , },   /* 4 */
+    {   "cma-uncached-dma32",       -1, MPP_ALLOC_FLAG_CMA                           | MPP_ALLOC_FLAG_DMA32, },   /* 5 */
+    {   "cma",                      -1, MPP_ALLOC_FLAG_CMA | MPP_ALLOC_FLAG_CACHABLE                       , },   /* 6 */
+    {   "cma-dma32",                -1, MPP_ALLOC_FLAG_CMA | MPP_ALLOC_FLAG_CACHABLE | MPP_ALLOC_FLAG_DMA32, },   /* 7 */
+};
+
 extern os_allocator allocator_dma_heap;

 #endif
diff --git a/osal/mpp_runtime.cpp b/osal/mpp_runtime.cpp
index c237996..2e469f3 100644
--- a/osal/mpp_runtime.cpp
+++ b/osal/mpp_runtime.cpp
@@ -18,11 +18,13 @@

 #include <fcntl.h>
 #include <unistd.h>
+#include <stdio.h>

 #include "mpp_env.h"
 #include "mpp_log.h"
 #include "mpp_common.h"
 #include "mpp_runtime.h"
+#include "allocator/allocator_dma_heap.h"

 #define MAX_DTS_PATH_LEN        256

@@ -86,7 +88,16 @@
     allocator_valid[MPP_BUFFER_TYPE_NORMAL] = 1;
     allocator_valid[MPP_BUFFER_TYPE_ION] = !access("/dev/ion", F_OK | R_OK | W_OK);
     allocator_valid[MPP_BUFFER_TYPE_DRM] = !access("/dev/dri/card0", F_OK | R_OK | W_OK);
-    allocator_valid[MPP_BUFFER_TYPE_DMA_HEAP] = !access("/dev/dma_heap", F_OK | R_OK);
+
+    allocator_valid[MPP_BUFFER_TYPE_DMA_HEAP] = 0;
+    for (int i = 0; i < MPP_ARRAY_ELEMS(heap_infos); i++) {
+        char buf[64];
+        snprintf(buf, sizeof(buf) - 1, "/dev/dma_heap/%s", heap_infos[i].name);
+        if(!access(buf, F_OK | R_OK)){
+            allocator_valid[MPP_BUFFER_TYPE_DMA_HEAP] = 1;
+            break;
+        }
+    }

     if (!allocator_valid[MPP_BUFFER_TYPE_ION] &&
         !allocator_valid[MPP_BUFFER_TYPE_DRM] &&

[HermanChen]

Thanks for the patch~