From: Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
Russell King <linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org>,
dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
Daniel Vetter <daniel-/w4YWyX8dFk@public.gmane.org>,
linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH v2 2/5] dma-mapping: Introduce dma_iommu_detach_device() API
Date: Thu, 26 Apr 2018 14:11:36 +0200 [thread overview]
Message-ID: <20180426121136.GD11985@ulmo> (raw)
In-Reply-To: <20180425151934.GC16075-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
[-- Attachment #1.1: Type: text/plain, Size: 908 bytes --]
On Wed, Apr 25, 2018 at 08:19:34AM -0700, Christoph Hellwig wrote:
> On Wed, Apr 25, 2018 at 12:10:48PM +0200, Thierry Reding wrote:
> > From: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> >
> > The dma_iommu_detach_device() API can be used by drivers to forcibly
> > detach a device from an IOMMU that architecture code might have attached
> > to. This is useful for drivers that need explicit control over the IOMMU
> > using the IOMMU API directly.
>
> Given that no one else implements it making it a generic API seems
> rather confusing. For now I'd rename it to
> arm_dma_iommu_detach_device() and only implement it in arm.
That'd be suboptimal because this code is used on both 32-bit and 64-bit
ARM. If we make the function 32-bit ARM specific then the driver code
would need to use an #ifdef to make sure compilation doesn't break on
64-bit ARM.
Thierry
[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
[-- Attachment #2: Type: text/plain, Size: 0 bytes --]
WARNING: multiple messages have this Message-ID (diff)
From: thierry.reding@gmail.com (Thierry Reding)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/5] dma-mapping: Introduce dma_iommu_detach_device() API
Date: Thu, 26 Apr 2018 14:11:36 +0200 [thread overview]
Message-ID: <20180426121136.GD11985@ulmo> (raw)
In-Reply-To: <20180425151934.GC16075@infradead.org>
On Wed, Apr 25, 2018 at 08:19:34AM -0700, Christoph Hellwig wrote:
> On Wed, Apr 25, 2018 at 12:10:48PM +0200, Thierry Reding wrote:
> > From: Thierry Reding <treding@nvidia.com>
> >
> > The dma_iommu_detach_device() API can be used by drivers to forcibly
> > detach a device from an IOMMU that architecture code might have attached
> > to. This is useful for drivers that need explicit control over the IOMMU
> > using the IOMMU API directly.
>
> Given that no one else implements it making it a generic API seems
> rather confusing. For now I'd rename it to
> arm_dma_iommu_detach_device() and only implement it in arm.
That'd be suboptimal because this code is used on both 32-bit and 64-bit
ARM. If we make the function 32-bit ARM specific then the driver code
would need to use an #ifdef to make sure compilation doesn't break on
64-bit ARM.
Thierry
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20180426/550c5cea/attachment.sig>
next prev parent reply other threads:[~2018-04-26 12:11 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-25 10:10 [PATCH v2 1/5] drm/nouveau: tegra: Detach from ARM DMA/IOMMU mapping Thierry Reding
2018-04-25 10:10 ` Thierry Reding
[not found] ` <20180425101051.15349-1-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-04-25 10:10 ` [PATCH v2 2/5] dma-mapping: Introduce dma_iommu_detach_device() API Thierry Reding
2018-04-25 10:10 ` Thierry Reding
[not found] ` <20180425101051.15349-2-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-04-25 15:19 ` Christoph Hellwig
2018-04-25 15:19 ` Christoph Hellwig
[not found] ` <20180425151934.GC16075-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2018-04-26 12:11 ` Thierry Reding [this message]
2018-04-26 12:11 ` Thierry Reding
2018-04-30 11:02 ` Thierry Reding
2018-04-30 11:02 ` Thierry Reding
2018-04-30 11:41 ` Robin Murphy
2018-04-30 11:41 ` Robin Murphy
[not found] ` <e549979d-9f53-a329-da1a-ed5139958762-5wv7dgnIgG8@public.gmane.org>
2018-04-30 12:12 ` Thierry Reding
2018-04-30 12:12 ` Thierry Reding
2018-04-30 12:49 ` Robin Murphy
2018-04-30 12:49 ` Robin Murphy
2018-04-25 10:10 ` [PATCH v2 3/5] ARM: dma-mapping: Implement arch_iommu_detach_device() Thierry Reding
2018-04-25 10:10 ` Thierry Reding
[not found] ` <20180425101051.15349-3-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-04-25 15:20 ` Christoph Hellwig
2018-04-25 15:20 ` Christoph Hellwig
[not found] ` <20180425152049.GD16075-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2018-04-26 12:14 ` Thierry Reding
2018-04-26 12:14 ` Thierry Reding
2018-04-25 10:10 ` [PATCH v2 4/5] drm/nouveau: tegra: Use dma_iommu_detach_device() Thierry Reding
2018-04-25 10:10 ` Thierry Reding
2018-04-25 10:10 ` [PATCH v2 5/5] ARM: Unconditionally enable ARM_DMA_USE_IOMMU Thierry Reding
2018-04-25 10:10 ` Thierry Reding
[not found] ` <20180425101051.15349-5-thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-04-25 10:25 ` Russell King - ARM Linux
2018-04-25 10:25 ` Russell King - ARM Linux
2018-04-25 15:17 ` Christoph Hellwig
2018-04-25 15:17 ` Christoph Hellwig
2018-04-25 15:18 ` [PATCH v2 1/5] drm/nouveau: tegra: Detach from ARM DMA/IOMMU mapping Christoph Hellwig
2018-04-25 15:18 ` Christoph Hellwig
[not found] ` <20180425151815.GB16075-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2018-04-26 12:09 ` Thierry Reding
2018-04-26 12:09 ` Thierry Reding
2018-04-25 15:28 ` Jordan Crouse
2018-04-25 15:28 ` Jordan Crouse
[not found] ` <20180425152849.GA2447-9PYrDHPZ2Orvke4nUoYGnHL1okKdlPRT@public.gmane.org>
2018-04-26 12:41 ` Thierry Reding
2018-04-26 12:41 ` Thierry Reding
2018-04-26 12:59 ` Mikko Perttunen
2018-04-26 12:59 ` Mikko Perttunen
[not found] ` <fd6e0d90-7614-296b-2927-7b2745e8fbde-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2018-04-26 13:14 ` Thierry Reding
2018-04-26 13:14 ` Thierry Reding
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=20180426121136.GD11985@ulmo \
--to=thierry.reding-re5jqeeqqe8avxtiumwx3w@public.gmane.org \
--cc=daniel-/w4YWyX8dFk@public.gmane.org \
--cc=dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org \
--cc=hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org \
--cc=iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org \
--cc=linux-I+IVW8TIWO2tmTQ+vhA3Yw@public.gmane.org \
--cc=linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org \
--cc=linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.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.