summaryrefslogtreecommitdiff
path: root/Documentation/scsi/ufs.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/scsi/ufs.txt')
-rw-r--r--Documentation/scsi/ufs.txt11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/scsi/ufs.txt b/Documentation/scsi/ufs.txt
index 520b5b033256..1769f71c4c20 100644
--- a/Documentation/scsi/ufs.txt
+++ b/Documentation/scsi/ufs.txt
@@ -147,6 +147,17 @@ send SG_IO with the applicable sg_io_v4:
io_hdr_v4.max_response_len = reply_len;
io_hdr_v4.request_len = request_len;
io_hdr_v4.request = (__u64)request_upiu;
+ if (dir == SG_DXFER_TO_DEV) {
+ io_hdr_v4.dout_xfer_len = (uint32_t)byte_cnt;
+ io_hdr_v4.dout_xferp = (uintptr_t)(__u64)buff;
+ } else {
+ io_hdr_v4.din_xfer_len = (uint32_t)byte_cnt;
+ io_hdr_v4.din_xferp = (uintptr_t)(__u64)buff;
+ }
+
+If you wish to read or write a descriptor, use the appropriate xferp of
+sg_io_v4.
+
UFS Specifications can be found at,
UFS - http://www.jedec.org/sites/default/files/docs/JESD220.pdf