From: vinod.koul@intel.com (Vinod Koul)
To: linux-arm-kernel@lists.infradead.org
Subject: Tearing down DMA transfer setup after DMA client has finished
Date: Thu, 8 Dec 2016 16:07:30 +0530 [thread overview]
Message-ID: <20161208103730.GB6408@localhost> (raw)
In-Reply-To: <yw1xvauv1yew.fsf@unicorn.mansr.com>
On Wed, Dec 07, 2016 at 04:44:55PM +0000, M?ns Rullg?rd wrote:
> Vinod Koul <vinod.koul@intel.com> writes:
> >>
> >> What you're proposing, Vinod, is to make a channel exclusive
> >> to a driver, as long as the driver has not explicitly released
> >> the channel, via dma_release_channel(), right?
> >
> > Precisely, but yes the downside of that is concurrent access are
> > limited, but am not sure if driver implements virtual channels and
> > allows that..
>
> My driver implements virtual channels. The problem is that the physical
> dma channels signal completion slightly too soon, at least with
> mem-to-device transfers. Apparently we need to keep the sbox routing
> until the peripheral indicates that it has actually received all the
> data.
So do we need concurrent accesses by all clients.
--
~Vinod
WARNING: multiple messages have this Message-ID (diff)
From: Vinod Koul <vinod.koul@intel.com>
To: "Måns Rullgård" <mans@mansr.com>
Cc: Mason <slash.tmp@free.fr>, Russell King <linux@arm.linux.org.uk>,
dmaengine@vger.kernel.org,
Linus Walleij <linus.walleij@linaro.org>,
Dan Williams <dan.j.williams@intel.com>,
LKML <linux-kernel@vger.kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Jon Mason <jdmason@kudzu.us>, Mark Brown <broonie@kernel.org>,
Lars-Peter Clausen <lars@metafoo.de>,
Lee Jones <lee.jones@linaro.org>,
Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
Arnd Bergmann <arnd@arndb.de>,
Maxime Ripard <maxime.ripard@free-electrons.com>,
Dave Jiang <dave.jiang@intel.com>,
Peter Ujfalusi <peter.ujfalusi@ti.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Sebastian Frias <sf84@laposte.net>,
Thibaud Cornic <thibaud_cornic@sigmadesigns.com>
Subject: Re: Tearing down DMA transfer setup after DMA client has finished
Date: Thu, 8 Dec 2016 16:07:30 +0530 [thread overview]
Message-ID: <20161208103730.GB6408@localhost> (raw)
In-Reply-To: <yw1xvauv1yew.fsf@unicorn.mansr.com>
On Wed, Dec 07, 2016 at 04:44:55PM +0000, Måns Rullgård wrote:
> Vinod Koul <vinod.koul@intel.com> writes:
> >>
> >> What you're proposing, Vinod, is to make a channel exclusive
> >> to a driver, as long as the driver has not explicitly released
> >> the channel, via dma_release_channel(), right?
> >
> > Precisely, but yes the downside of that is concurrent access are
> > limited, but am not sure if driver implements virtual channels and
> > allows that..
>
> My driver implements virtual channels. The problem is that the physical
> dma channels signal completion slightly too soon, at least with
> mem-to-device transfers. Apparently we need to keep the sbox routing
> until the peripheral indicates that it has actually received all the
> data.
So do we need concurrent accesses by all clients.
--
~Vinod
next prev parent reply other threads:[~2016-12-08 10:37 UTC|newest]
Thread overview: 164+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-23 10:25 Tearing down DMA transfer setup after DMA client has finished Mason
2016-11-23 10:25 ` Mason
2016-11-23 12:13 ` Måns Rullgård
2016-11-23 12:13 ` Måns Rullgård
2016-11-23 12:41 ` Mason
2016-11-23 12:41 ` Mason
2016-11-23 17:21 ` Måns Rullgård
2016-11-23 17:21 ` Måns Rullgård
2016-11-24 10:53 ` Mason
2016-11-24 10:53 ` Mason
2016-11-24 14:17 ` Måns Rullgård
2016-11-24 14:17 ` Måns Rullgård
2016-11-24 15:20 ` Mason
2016-11-24 15:20 ` Mason
2016-11-24 16:37 ` Måns Rullgård
2016-11-24 16:37 ` Måns Rullgård
2016-11-25 4:55 ` Vinod Koul
2016-11-25 4:55 ` Vinod Koul
2016-11-25 11:57 ` Måns Rullgård
2016-11-25 11:57 ` Måns Rullgård
2016-11-25 14:05 ` Mason
2016-11-25 14:05 ` Mason
2016-11-25 14:12 ` Måns Rullgård
2016-11-25 14:12 ` Måns Rullgård
2016-11-25 14:28 ` Mason
2016-11-25 14:28 ` Mason
2016-11-25 14:42 ` Måns Rullgård
2016-11-25 14:42 ` Måns Rullgård
2016-11-25 12:45 ` Russell King - ARM Linux
2016-11-25 12:45 ` Russell King - ARM Linux
2016-11-25 13:07 ` Måns Rullgård
2016-11-25 13:07 ` Måns Rullgård
2016-11-25 13:34 ` Russell King - ARM Linux
2016-11-25 13:34 ` Russell King - ARM Linux
2016-11-25 13:50 ` Måns Rullgård
2016-11-25 13:50 ` Måns Rullgård
2016-11-25 13:58 ` Russell King - ARM Linux
2016-11-25 13:58 ` Russell King - ARM Linux
2016-11-25 14:03 ` Måns Rullgård
2016-11-25 14:03 ` Måns Rullgård
2016-11-25 14:17 ` Russell King - ARM Linux
2016-11-25 14:17 ` Russell King - ARM Linux
2016-11-25 14:40 ` Måns Rullgård
2016-11-25 14:40 ` Måns Rullgård
2016-11-25 14:56 ` Russell King - ARM Linux
2016-11-25 14:56 ` Russell King - ARM Linux
2016-11-25 15:08 ` Måns Rullgård
2016-11-25 15:08 ` Måns Rullgård
2016-11-25 15:02 ` Mason
2016-11-25 15:02 ` Mason
2016-11-25 15:12 ` Måns Rullgård
2016-11-25 15:12 ` Måns Rullgård
2016-11-25 15:21 ` Mason
2016-11-25 15:21 ` Mason
2016-11-25 15:28 ` Måns Rullgård
2016-11-25 15:28 ` Måns Rullgård
2016-11-25 12:46 ` Mason
2016-11-25 12:46 ` Mason
2016-11-25 13:11 ` Måns Rullgård
2016-11-25 13:11 ` Måns Rullgård
2016-11-25 14:21 ` Mason
2016-11-25 14:21 ` Mason
2016-11-25 14:37 ` Måns Rullgård
2016-11-25 14:37 ` Måns Rullgård
2016-11-25 15:35 ` Mason
2016-11-25 15:35 ` Mason
2016-11-29 18:25 ` Mason
2016-11-29 18:25 ` Mason
2016-12-06 5:12 ` Vinod Koul
2016-12-06 5:12 ` Vinod Koul
2016-12-06 12:42 ` Mason
2016-12-06 12:42 ` Mason
2016-12-06 13:14 ` Måns Rullgård
2016-12-06 13:14 ` Måns Rullgård
2016-12-06 15:24 ` Mason
2016-12-06 15:24 ` Mason
2016-12-06 15:34 ` Måns Rullgård
2016-12-06 15:34 ` Måns Rullgård
2016-12-06 22:55 ` Mason
2016-12-06 22:55 ` Mason
2016-12-07 16:43 ` Vinod Koul
2016-12-07 16:43 ` Vinod Koul
2016-12-07 16:45 ` Måns Rullgård
2016-12-07 16:45 ` Måns Rullgård
2016-12-08 10:39 ` Vinod Koul
2016-12-08 10:39 ` Vinod Koul
2016-12-08 10:54 ` Mason
2016-12-08 10:54 ` Mason
2016-12-08 11:18 ` Geert Uytterhoeven
2016-12-08 11:18 ` Geert Uytterhoeven
2016-12-08 11:47 ` Måns Rullgård
2016-12-08 11:47 ` Måns Rullgård
2016-12-08 12:03 ` Geert Uytterhoeven
2016-12-08 12:03 ` Geert Uytterhoeven
2016-12-08 12:17 ` Mason
2016-12-08 12:17 ` Mason
2016-12-08 12:21 ` Måns Rullgård
2016-12-08 12:21 ` Måns Rullgård
2016-12-08 16:37 ` Vinod Koul
2016-12-08 16:37 ` Vinod Koul
2016-12-08 16:48 ` Måns Rullgård
2016-12-08 16:48 ` Måns Rullgård
2016-12-09 6:59 ` Vinod Koul
2016-12-09 6:59 ` Vinod Koul
2016-12-09 10:25 ` Sebastian Frias
2016-12-09 10:25 ` Sebastian Frias
2016-12-09 11:34 ` Måns Rullgård
2016-12-09 11:34 ` Måns Rullgård
2016-12-09 11:35 ` 1Måns Rullgård
2016-12-09 11:35 ` 1Måns Rullgård
2016-12-09 17:17 ` Vinod Koul
2016-12-09 17:17 ` Vinod Koul
2016-12-09 17:28 ` Måns Rullgård
2016-12-09 17:28 ` Måns Rullgård
2016-12-09 17:53 ` Vinod Koul
2016-12-09 17:53 ` Vinod Koul
2016-12-09 17:34 ` Mason
2016-12-09 17:34 ` Mason
2016-12-09 17:56 ` Vinod Koul
2016-12-09 17:56 ` Vinod Koul
2016-12-09 18:17 ` Vinod Koul
2016-12-09 18:17 ` Vinod Koul
2016-12-09 18:23 ` Mason
2016-12-09 18:23 ` Mason
2016-12-12 5:01 ` Vinod Koul
2016-12-12 5:01 ` Vinod Koul
2016-12-15 11:17 ` Mark Brown
2016-12-15 11:17 ` Mark Brown
2016-12-08 11:44 ` Måns Rullgård
2016-12-08 11:44 ` Måns Rullgård
2016-12-08 11:59 ` Geert Uytterhoeven
2016-12-08 11:59 ` Geert Uytterhoeven
2016-12-08 12:20 ` Måns Rullgård
2016-12-08 12:20 ` Måns Rullgård
2016-12-08 12:31 ` Geert Uytterhoeven
2016-12-08 12:31 ` Geert Uytterhoeven
2016-12-08 12:41 ` Mason
2016-12-08 12:41 ` Mason
2016-12-08 12:44 ` Måns Rullgård
2016-12-08 12:44 ` Måns Rullgård
2016-12-08 13:29 ` Mason
2016-12-08 13:29 ` Mason
2016-12-08 13:39 ` Måns Rullgård
2016-12-08 13:39 ` Måns Rullgård
2016-12-08 15:50 ` Vinod Koul
2016-12-08 15:50 ` Vinod Koul
2016-12-08 16:36 ` Måns Rullgård
2016-12-08 16:36 ` Måns Rullgård
2016-12-08 15:40 ` Vinod Koul
2016-12-08 15:40 ` Vinod Koul
2016-12-08 15:43 ` Mason
2016-12-08 15:43 ` Mason
2016-12-08 16:21 ` Vinod Koul
2016-12-08 16:21 ` Vinod Koul
2016-12-08 16:46 ` Måns Rullgård
2016-12-08 16:46 ` Måns Rullgård
2016-12-07 16:41 ` Vinod Koul
2016-12-07 16:41 ` Vinod Koul
2016-12-07 16:44 ` Måns Rullgård
2016-12-07 16:44 ` Måns Rullgård
2016-12-08 10:37 ` Vinod Koul [this message]
2016-12-08 10:37 ` Vinod Koul
2016-12-08 11:44 ` Måns Rullgård
2016-12-08 11:44 ` Måns Rullgård
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20161208103730.GB6408@localhost \
--to=vinod.koul@intel.com \
--cc=linux-arm-kernel@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.