On 2017-06-28 19:25, Zang Leigang wrote:
On Wed, Jun 28, 2017 at 04:42:36PM -0700, Subhash Jadavani wrote:
On 2017-06-24 03:27, Zang Leigang wrote:
>Host set ocs to OCS_ABORTED when clear a doorbell in err handler.
OCS field is valid after host controller has cleared the
corresponding doorbell (UTRLDBR) bit to zero. And here HW would be
clearing the doorbell bit, not the SW. So I am not sure what do you
mean in sentence above? Can you please elaborate more on this?
Err handler clear PENDING transfer requests with ufshcd_clear_cmd,
and host set these requests's ocs to 6(OCS_ABORTED). I think it's
If we are saying that "Host controller setting the OCS to 6 when SW
clears a tag in UTRLCLR" then it isn't a UFSHCI standard defined
behavior instead this seems to be very specific to your UFS controller
specific behavior. Ideally OCS shouldn't be modified by host in this
case and as SW has set the OCS to OCS_INVALID_COMMAND_STATUS before the
transfer, request will be re-queued. If you want to handle the
OCS_ABORTED differently for your host controllers, you may have to add
the host controller quirk and enable it for your controllers.
better to let these request retry, because an err handler may fix
the err condition.
>Then scsi_decide_disposition return SUCCESS. This may cause some
>filesystem panic because a FAILED REQUESET. Requeue and complete is
>better.
Why do you think retrying this HW aborted request will succeed next
time? Are we going to fix some request parameters before retrying?
If not, it will most likely fail again.
HW aborted request commonly comes from err handler with
"ufshcd_clear_cmd",
In fact, I never seen that host aborted a request on host's own
initiative.
If err handler successfully re-link and fix the host or device, retry
will
most likely success.
>
>Signed-off-by: Zang Leigang <zangleigang@xxxxxxxxxxxxx>
>
>diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>index ffe8d8608818..e050dcea1bea 100644
>--- a/drivers/scsi/ufs/ufshcd.c
>+++ b/drivers/scsi/ufs/ufshcd.c
>@@ -4545,8 +4545,6 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba,
>struct ufshcd_lrb *lrbp)
> }
> break;
> case OCS_ABORTED:
>- result |= DID_ABORT << 16;
>- break;
> case OCS_INVALID_COMMAND_STATUS:
> result |= DID_REQUEUE << 16;
> break;
--
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--
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
