From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
To: Brian Starkey <Brian.Starkey-5wv7dgnIgG8@public.gmane.org>
Cc: Dave Airlie <airlied-cv59FeDIM0c@public.gmane.org>,
linux-arm-msm
<linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Linux Kernel Mailing List
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
dri-devel
<dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>,
Tomasz Figa <tfiga-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
"Clark, Rob" <robdclark-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Sean Paul <seanpaul-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
"vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org"
<vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
nd <nd-5wv7dgnIgG8@public.gmane.org>,
freedreno
<freedreno-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>,
Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>,
Robin Murphy <Robin.Murphy-5wv7dgnIgG8@public.gmane.org>
Subject: Re: [PATCH v3 1/1] drm: msm: Replace dma_map_sg with dma_sync_sg*
Date: Thu, 29 Nov 2018 19:35:50 +0100 [thread overview]
Message-ID: <20181129183550.GD30281@lst.de> (raw)
In-Reply-To: <20181129173301.rye77slpy27regi5-cyTpl0DnfLAx1Goa8x4jbQH0AcctZ4a01BehtkLrGTY@public.gmane.org>
On Thu, Nov 29, 2018 at 05:33:03PM +0000, Brian Starkey wrote:
> This sounds very useful for ion, to avoid CPU cache maintenance as
> long as the buffer stays in device-land.
>
> One question though: How would you determine "the last user to unmap"
> to know when to do the final "make visible to CPU" step?
I'd assume the user of the DMA API keeps track of it. E.g. dmabuf
would be a pretty natural layer to implement common logic for this.
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next prev parent reply other threads:[~2018-11-29 18:35 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-29 14:03 [PATCH v3 1/1] drm: msm: Replace dma_map_sg with dma_sync_sg* Vivek Gautam
2018-11-29 14:14 ` Christoph Hellwig
2018-11-29 14:25 ` Rob Clark
[not found] ` <CAF6AEGvsFbXGkC+=4oq1xXnoC2EVX2J0k-GqShefcek1=uw4Lw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-11-29 14:42 ` Rob Clark
2018-11-29 15:54 ` Christoph Hellwig
[not found] ` <20181129155418.GB26537-jcswGhMUV9g@public.gmane.org>
2018-11-29 18:48 ` Rob Clark
[not found] ` <CAF6AEGufdp5jRtUZ_+VRQg3ZXH36hNHvbWZQeJDArp8N5SZ3Lg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-11-29 19:40 ` Jordan Crouse
2018-11-29 19:57 ` Tomasz Figa
[not found] ` <CAAFQd5D139pNx9aEpO8745R4kfVYCBDyqyJNR_HDDXvKt7NZjw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-11-29 20:03 ` Robin Murphy
2018-11-30 0:23 ` Tomasz Figa
2018-12-01 2:05 ` Tomasz Figa
[not found] ` <CAAFQd5DMgGDPcK=4DktfC7T9O0MrU1VBqJqR+6VYpOh_DdEXUg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-12-01 11:46 ` Rob Clark
[not found] ` <CAF6AEGujyP78PjOMwTmdHcJKpsrgmRGage=pFniad98peMBrDw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-12-03 0:12 ` Tomasz Figa
2018-11-29 14:43 ` Daniel Vetter
2018-11-29 15:57 ` Christoph Hellwig
[not found] ` <20181129155758.GC26537-jcswGhMUV9g@public.gmane.org>
2018-11-29 16:28 ` Daniel Vetter
[not found] ` <20181129162807.GL21184-dv86pmgwkMBes7Z6vYuT8azUEOm+Xw19@public.gmane.org>
2018-11-29 16:57 ` Christoph Hellwig
2018-11-29 17:09 ` Daniel Vetter
2018-11-29 17:24 ` Tomasz Figa
2018-11-29 18:35 ` Christoph Hellwig
[not found] ` <CAAFQd5A-Bh711VaNWhRJqcrofkBVCMFcNgqfztoyWJcUdhSu0Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-11-29 18:57 ` Rob Clark
2018-11-30 9:40 ` Daniel Vetter
2018-11-30 9:35 ` Daniel Vetter
2018-11-30 9:44 ` Christoph Hellwig
2018-11-29 18:33 ` Christoph Hellwig
[not found] ` <20181129183334.GB30281-jcswGhMUV9g@public.gmane.org>
2018-11-30 9:46 ` Daniel Vetter
2018-12-07 1:38 ` Christoph Hellwig
[not found] ` <20181207013841.GA4530-jcswGhMUV9g@public.gmane.org>
2018-12-07 14:29 ` Rob Clark
2018-11-29 17:33 ` Brian Starkey
[not found] ` <20181129173301.rye77slpy27regi5-cyTpl0DnfLAx1Goa8x4jbQH0AcctZ4a01BehtkLrGTY@public.gmane.org>
2018-11-29 18:35 ` Christoph Hellwig [this message]
2018-11-30 1:15 ` Rob Clark
2018-11-30 9:35 ` Christoph Hellwig
2018-11-29 15:53 ` Christoph Hellwig
[not found] ` <20181129155310.GA26537-jcswGhMUV9g@public.gmane.org>
2018-11-29 18:44 ` Rob Clark
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