[PATCH v9 6/8] blkmap: store type of blkmap slice in corresponding structure

[Sughosh Ganu]

Add information about the type of blkmap slices as an attribute in the
corresponding slice structure. Put information in the blkmap slice
structure to identify if it is associated with a memory or linear
mapped device. Which can then be used to take specific action based on
the type of the blkmap slice.

Signed-off-by: Sughosh Ganu <sughosh.ganu at linaro.org>
Reviewed-by: Tobias Waldekranz <tobias at waldekranz.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
---
Changes since V8:
* s/blkmap slice/blkmap slices/ in the commit message
* Add comments to the macros added in the patch

 drivers/block/blkmap.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/block/blkmap.c b/drivers/block/blkmap.c
index 34eed1380dc..08f68570224 100644
--- a/drivers/block/blkmap.c
+++ b/drivers/block/blkmap.c
@@ -16,6 +16,22 @@
 
 struct blkmap;
 
+/**
+ * define BLKMAP_SLICE_LINEAR - Linear mapping to another block device
+ *
+ * This blkmap slice type is used for mapping to other existing block
+ * devices.
+ */
+#define BLKMAP_SLICE_LINEAR	BIT(0)
+
+/**
+ * define BLKMAP_SLICE_MEM - Linear mapping to memory based block device
+ *
+ * This blkmap slice type is used for mapping to memory based block
+ * devices, like ramdisks.
+ */
+#define BLKMAP_SLICE_MEM	BIT(1)
+
 /**
  * struct blkmap_slice - Region mapped to a blkmap
  *
@@ -25,12 +41,14 @@ struct blkmap;
  * @node: List node used to associate this slice with a blkmap
  * @blknr: Start block number of the mapping
  * @blkcnt: Number of blocks covered by this mapping
+ * @attr: Attributes of blkmap slice
  */
 struct blkmap_slice {
 	struct list_head node;
 
 	lbaint_t blknr;
 	lbaint_t blkcnt;
+	uint     attr;
 
 	/**
 	 * @read: - Read from slice
@@ -169,6 +187,7 @@ int blkmap_map_linear(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
 		.slice = {
 			.blknr = blknr,
 			.blkcnt = blkcnt,
+			.attr = BLKMAP_SLICE_LINEAR,
 
 			.read = blkmap_linear_read,
 			.write = blkmap_linear_write,
@@ -248,6 +267,7 @@ int __blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
 		.slice = {
 			.blknr = blknr,
 			.blkcnt = blkcnt,
+			.attr = BLKMAP_SLICE_MEM,
 
 			.read = blkmap_mem_read,
 			.write = blkmap_mem_write,
-- 
2.34.1