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From: "Ahmed S. Darwish" <darwish.07@gmail.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Rob Springer <rspringer@google.com>,
	John Joseph <jnjoseph@google.com>, Simon Que <sque@chromium.org>,
	Todd Poynor <toddpoynor@google.com>,
	linux-kernel@vger.kernel.org, devel@linuxdriverproject.org
Subject: Re: [GIT PULL] Staging/IIO driver patches for 4.19-rc1
Date: Tue, 28 Aug 2018 10:38:17 +0000
Message-ID: <20180828103817.GB1397@do-kernel> (raw)
In-Reply-To: <20180818155724.GA22569@kroah.com>

[ re-send; forgotten lkml CC added; sorry ]

Hi,

On Sat, 18 Aug 2018 17:57:24 +0200, Greg KH wrote:
[...]
> addition of some new IIO drivers.  Also added was a "gasket" driver from
> Google that needs loads of work and the erofs filesystem.
> 

Why are we adding __a whole new in-kernel framework__ for
developing basic user-space drivers?

We already have a frameowrk for that, and it's UIO. [1] The UIO
code is a very stable and simple subsystem; it's also heavily used
in the embedded industry..

I've looked at the gasket documentation [2], and the first user
of this new in-kernel API [3], and this is almost replicating UIO
it's not funny. [4] True, the gasket APIs adds some extra new
conveniences (PCI BAR re-mapping, MSI, ..), but there's no
technical reason this cannot be added to the UIO code instead.

More-over, the exposed user-space API is just some ioctls. So if
google hase some shipped user-space code that is using this,
hopefully the driver can still be re-implemented through UIO
without changing these bits..

Thanks,

[1] https://www.kernel.org/doc/html/v4.18/driver-api/uio-howto.html
[2] drivers/staging/gasket/gasket_core.h :: struct gasket_driver_desc
[3] drivers/staging/gasket/apex_driver.c
[4] include/linux/uio_driver.h

--
Darwi
http://darwish.chasingpointers.com

  parent reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-18 15:57 Greg KH
2018-08-18 18:00 ` Linus Torvalds
2018-08-19  6:07   ` Greg Kroah-Hartman
2018-08-28 10:38 ` Ahmed S. Darwish [this message]
2018-08-28 11:20   ` Todd Poynor
2018-08-28 12:36   ` Greg KH
2018-08-28 14:30     ` Ahmed S. Darwish
2018-09-10  8:16       ` Greg KH
2018-09-10 15:28         ` [PATCH] staging: gasket: TODO: re-implement using UIO Ahmed S. Darwish
2018-11-07  0:20           ` RFC: staging: gasket: " Todd Poynor
2018-11-07  9:20             ` Greg KH

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