common/dpaax: fallback to check separate memory node for VM

[ upstream commit c9d9825 ]

In Virtual Machine the memory node in the device tree is at
'/proc/device-tree/memory/reg' which is separate from the memory
node path on the host. This patch enables check on both the paths.

Fixes: 2f3d633 ("common/dpaax: add library for PA/VA translation table")

Signed-off-by: Nipun Gupta <nipun.gupta@nxp.com>

drivers/common/dpaax/dpaax_iova_table.c

@@ -68,9 +68,12 @@ read_memory_node(unsigned int *count)
 	*count = 0;
 
 	ret = glob(MEM_NODE_PATH_GLOB, 0, NULL, &result);
+	if (ret != 0)
+		ret = glob(MEM_NODE_PATH_GLOB_VM, 0, NULL, &result);
+
 	if (ret != 0) {
-		DPAAX_DEBUG("Unable to glob device-tree memory node: (%s)(%d)",
-			    MEM_NODE_PATH_GLOB, ret);
+		DPAAX_DEBUG("Unable to glob device-tree memory node (err: %d)",
+			ret);
 		goto out;
 	}
 

drivers/common/dpaax/dpaax_iova_table.h

@@ -45,6 +45,8 @@ extern struct dpaax_iova_table *dpaax_iova_table_p;
  * is SoC dependent, or even Uboot fixup dependent.
  */
 #define MEM_NODE_PATH_GLOB "/proc/device-tree/memory[@0-9]*/reg"
+/* For Virtual Machines memory node is at different path (below) */
+#define MEM_NODE_PATH_GLOB_VM "/proc/device-tree/memory/reg"
 /* Device file should be multiple of 16 bytes, each containing 8 byte of addr
  * and its length. Assuming max of 5 entries.
  */