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Re: [Minios-devel] [UNIKRAFT PATCH 12/12] plat/drivers: Add rest of the interface for virtio block
I mistyped the author of this patch. I will correct it in the v2 of the series.
Roxana
This patch adds the rest of the interface for virtio block device
which is found in the specs.
Note: For now, it is not used in the implementation of the virtio driver.
Signed-off-by: Sharan Santhanam <sharan.santhanam@xxxxxxxxx>
---
plat/drivers/include/virtio/virtio_blk.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/plat/drivers/include/virtio/virtio_blk.h b/plat/drivers/include/virtio/virtio_blk.h
index 1b8dffd3..191cc91f 100644
--- a/plat/drivers/include/virtio/virtio_blk.h
+++ b/plat/drivers/include/virtio/virtio_blk.h
@@ -28,16 +28,24 @@
#define VIRTIO_BLK_F_SIZE_MAX 1
/* Maximum number of segments in a request is in seg_max. */
#define VIRTIO_BLK_F_SEG_MAX 2
+/* Disk-style geometry specified in geometry */
+#define VIRTIO_BLK_F_GEOMETRY 4
/* Device is read-only. */
#define VIRTIO_BLK_F_RO 5
/* Block size of disk is in blk_size. */
#define VIRTIO_BLK_F_BLK_SIZE 6
/* Cache flush command support. */
#define VIRTIO_BLK_F_FLUSH 9
+/* Device exports information on optimal I/O alignment. */
+#define VIRTIO_BLK_F_TOPOLOGY 10
/* Device can toggle its cache between writeback and writethrough modes. */
#define VIRTIO_BLK_F_CONFIG_WCE 11
/* Device supports multi-queues */
#define VIRTIO_BLK_F_MQ 12
+/* Device supports request barriers. */
+#define VIRTIO_BLK_F_BARRIER 0
+/* Device supports scsi packet commands. */
+#define VIRTIO_BLK_F_SCSI 7
/* Response status */
#define VIRTIO_BLK_S_OK 0
@@ -51,8 +59,25 @@ struct virtio_blk_config {
__u32 size_max;
/* Maximum size of a segment */
__u32 seg_max;
+ /* Geometry */
+ struct virtio_blk_geometry {
+ __u16 cylinders;
+ __u8 heads;
+ __u8 sectors;
+ } geometry;
/* Block size */
__u32 blk_size;
+ /* Topology */
+ struct virtio_blk_topology {
+ /* of logical blocks per physical block (log2) */
+ __u8 physical_block_exp;
+ /* offset of first aligned logical block */
+ __u8 alignment_offset;
+ /* suggested minimum I/O size in blocks */
+ __u16 min_io_size;
+ /* optimal (suggested maximum) I/O size in blocks */
+ __u32 opt_io_size;
+ } topology;
/* It is set if backend has writeback cache,
* otherwise it has writethrough cache.
**/
--
2.11.0
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