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scsi: ufs-bsg: Allow reading descriptors 

Add this functionality, placing the descriptor being read in the actual
data buffer in the bio.

That is, for both read and write descriptors query upiu, we are using the
job's request_payload.  This in turn, is mapped back in user land to the
applicable sg_io_v4 xferp: dout_xferp for write descriptor, and din_xferp
for read descriptor.

Signed-off-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Evan Green <evgreen@chromium.org>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
hifive-unleashed-5.1
Avri Altman 2019-02-20 09:11:14 +02:00 committed by Martin K. Petersen
parent 4bbbe24216
commit 5c17f87abb
2 changed files with 18 additions and 9 deletions
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7
Documentation/scsi/ufs.txt
View File

@ -150,9 +150,14 @@ send SG_IO with the applicable sg_io_v4:
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 write a descriptor, use the dout_xferp sg_io_v4.
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

20
drivers/scsi/ufs/ufs_bsg.c
View File

@ -48,12 +48,8 @@ static int ufs_bsg_alloc_desc_buffer(struct ufs_hba *hba, struct bsg_job *job,
struct utp_upiu_query *qr;
u8 *descp;
if (desc_op == UPIU_QUERY_OPCODE_READ_DESC) {
dev_err(hba->dev, "unsupported opcode %d\n", desc_op);
return -ENOTSUPP;
}
if (desc_op != UPIU_QUERY_OPCODE_WRITE_DESC)
if (desc_op != UPIU_QUERY_OPCODE_WRITE_DESC &&
desc_op != UPIU_QUERY_OPCODE_READ_DESC)
goto out;
qr = &bsg_request->upiu_req.qr;
@ -71,8 +67,10 @@ static int ufs_bsg_alloc_desc_buffer(struct ufs_hba *hba, struct bsg_job *job,
if (!descp)
return -ENOMEM;
sg_copy_to_buffer(job->request_payload.sg_list,
job->request_payload.sg_cnt, descp, *desc_len);
if (desc_op == UPIU_QUERY_OPCODE_WRITE_DESC)
sg_copy_to_buffer(job->request_payload.sg_list,
job->request_payload.sg_cnt, descp,
*desc_len);
*desc_buff = descp;
@ -140,6 +138,12 @@ static int ufs_bsg_request(struct bsg_job *job)
if (!desc_buff)
goto out;
if (desc_op == UPIU_QUERY_OPCODE_READ_DESC && desc_len)
bsg_reply->reply_payload_rcv_len =
sg_copy_from_buffer(job->request_payload.sg_list,
job->request_payload.sg_cnt,
desc_buff, desc_len);
kfree(desc_buff);
out: