A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 02:32:09 -04:00
Code Issues Projects Releases Packages Wiki Activity

scsi: ufs-bsg: Change the calling convention for write descriptor

Browse source 
When we had a write descriptor query upiu, we appended the descriptor right
after the bsg request.  This was fine as the bsg driver allows to allocate
whatever buffer we needed in its job request.

Still, the proper way to deliver payload, however small (we only write
config descriptors of 144 bytes), is by using the job request payload data
buffer.

So change this ABI now, while ufs-bsg is still new, and nobody is actually
using it.

Signed-off-by: Avri Altman <[email protected]>
Reviewed-by: Evan Green <[email protected]>
Reviewed-by: Bean Huo <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
This commit is contained in:
Avri Altman 2019-02-20 09:11:12 +02:00 • committed by Martin K. Petersen
commit 4eaa329e33
2 changed files with 32 additions and 21 deletions
Download patch file Download diff file Expand all files Collapse all files

6
Documentation/scsi/ufs.txt
View file

@ -147,6 +147,12 @@ 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;
}
If you wish to write a descriptor, use the dout_xferp sg_io_v4.
UFS Specifications can be found at,
UFS - http://www.jedec.org/sites/default/files/docs/JESD220.pdf