On 2016-09-28 02:19, Joao Pinto wrote:
Hi again!
Could you also send me an example of how you are using the IOCTL from
your user
app (send/receive data)? I already have my implemented but you use a
different
mechanism (I have checked your structures in uapi/scsi/ufs/) and I have
to port
it! Thanks!
You may use the SG_IO ioctl with sg device node for any data read/write
operations.
http://www.tldp.org/HOWTO/SCSI-Generic-HOWTO/sg_io.html has some
details.
On 9/28/2016 10:06 AM, Joao Pinto wrote:
Hi Subhash,
On 9/28/2016 12:05 AM, subha...@codeaurora.org wrote:
Hi Joao,
On 2016-09-26 18:10, Kiwoong Kim wrote:
Hi.
If you want to declare some things for user interface,
is it be better to put those thing include/uapi/linux/ than
include/linux?
Agreed with Mr. Pinto's opinion with respect to implementing
additional ioctls.
Yes, "scsi_host_template" allows the LLD's to export their ioctl
callback and
then you can use the sg interface to issue UFS specific ioctls. We
had
implemented similar ioctl for our use, here is the reference code:
https://source.codeaurora.org/quic/la/kernel/msm-3.18/tree/drivers/scsi/ufs/ufshcd.c?h=LA.HB.1.1.1.c2#n6791.
This was mainly done to export the UFS query request interface to
user space.
Declarations where exported under include/uapi/scsi/ufs/ . If you
want to build
upon this already existing functionality, i can post the formal patch
on mailing
list.
Yes, of course I have interest on building on top of what you have
done already.
Did yu submit this patch to the kernel already? Could you please send
me the
patch and kernel version to apply?
Thanks,
Joao
Regards,
Subhash
Regards.
-----Original Message-----
From: linux-scsi-ow...@vger.kernel.org [mailto:linux-scsi-
ow...@vger.kernel.org] On Behalf Of Shaun Tancheff
Sent: Tuesday, September 27, 2016 4:23 AM
To: Joao Pinto
Cc: linux-scsi@vger.kernel.org; linux-ker...@vger.kernel.org
Subject: Re: UFS API in the kernel
On Thu, Sep 22, 2016 at 10:21 AM, Joao Pinto
<joao.pi...@synopsys.com>
wrote:
Hi!
I am designing an application that has the goal to be an utility
for
Unipro and UFS testing purposes. This application is going to run
on
top of a recent Linux Kernel containing the new UFS stack
(including the
new DWC drivers).
I am considering doing the following:
a) Create a new config item called CONFIG_UFS_CHARDEV which is
going
to create a char device responsible to make some IOCTL available
for
user-space applications
b) Create a linux/ufs.h header file that contains data structures
declarations that will be needed in user-space applications
I am not very familiar with UFS devices, that said you should have
an sgX
chardev being created already so you can handle SG_IO requests.
There also appear to be some sysfs entries being created.
So between sg and sysfs you should be able to handle any user-space
out of
band requests without resorting to making a new chardev.
Adding more sysfs entries, if you need them, should be fine.
You may find it easier to expand on the existing interfaces than to
get
consensus on a new driver and ioctls.
Hope this helps,
Shaun
Could you please advise me about what the correct approach should
be
to make it as standard as possible and usable in the future?
Thank you very much for your help!
regards,
Joao
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