From: "joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org" <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
To: Stuart Yoder <stuart.yoder-3arQi8VN3Tc@public.gmane.org>
Cc: Bharat Bhushan <bharat.bhushan-3arQi8VN3Tc@public.gmane.org>,
"will.deacon-5wv7dgnIgG8@public.gmane.org"
<will.deacon-5wv7dgnIgG8@public.gmane.org>,
Peter Newton <peter.newton-3arQi8VN3Tc@public.gmane.org>,
"iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org"
<iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
Varun Sethi <V.Sethi-3arQi8VN3Tc@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>
Subject: Re: RFC: extend IOMMU attributes
Date: Thu, 25 Feb 2016 15:38:55 +0100 [thread overview]
Message-ID: <20160225143855.GD16675@8bytes.org> (raw)
In-Reply-To: <HE1PR04MB1641F22E38710B68F4ED891F8DAF0-6LN7OEpIatU5tNmRkpaxD89NdZoXdze2vxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
On Thu, Feb 18, 2016 at 04:16:26PM +0000, Stuart Yoder wrote:
> #define IOMMU_READ (1 << 0)
> #define IOMMU_WRITE (1 << 1)
> -#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
> +#define IOMMU_CACHE_COHERENT (1 << 2) /* cacheable and coherent */
> #define IOMMU_NOEXEC (1 << 3)
> #define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
> +#define IOMMU_CACHEABLE (1 << 5) /* cacheable, not coherent */
> +#define IOMMU_CACHE_ALLOCATE (1 << 6) /* hint to allocate in the cache */
Hmm, this might be a valid use-case to introduce the
map_attr()/unmap_attr() calls to the IOMMU-API. I have been resistant to
these functions until now because the proposed use-cases were not
convincing, but for hardware-specific map-attributes like this one it
could make sense.
Joerg
WARNING: multiple messages have this Message-ID (diff)
From: joro@8bytes.org (joro at 8bytes.org)
To: linux-arm-kernel@lists.infradead.org
Subject: RFC: extend IOMMU attributes
Date: Thu, 25 Feb 2016 15:38:55 +0100 [thread overview]
Message-ID: <20160225143855.GD16675@8bytes.org> (raw)
In-Reply-To: <HE1PR04MB1641F22E38710B68F4ED891F8DAF0@HE1PR04MB1641.eurprd04.prod.outlook.com>
On Thu, Feb 18, 2016 at 04:16:26PM +0000, Stuart Yoder wrote:
> #define IOMMU_READ (1 << 0)
> #define IOMMU_WRITE (1 << 1)
> -#define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
> +#define IOMMU_CACHE_COHERENT (1 << 2) /* cacheable and coherent */
> #define IOMMU_NOEXEC (1 << 3)
> #define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
> +#define IOMMU_CACHEABLE (1 << 5) /* cacheable, not coherent */
> +#define IOMMU_CACHE_ALLOCATE (1 << 6) /* hint to allocate in the cache */
Hmm, this might be a valid use-case to introduce the
map_attr()/unmap_attr() calls to the IOMMU-API. I have been resistant to
these functions until now because the proposed use-cases were not
convincing, but for hardware-specific map-attributes like this one it
could make sense.
Joerg
next prev parent reply other threads:[~2016-02-25 14:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-18 16:16 RFC: extend IOMMU attributes Stuart Yoder
2016-02-18 16:16 ` Stuart Yoder
[not found] ` <HE1PR04MB1641F22E38710B68F4ED891F8DAF0-6LN7OEpIatU5tNmRkpaxD89NdZoXdze2vxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2016-02-18 16:21 ` Will Deacon
2016-02-18 16:21 ` Will Deacon
[not found] ` <20160218162145.GB16883-5wv7dgnIgG8@public.gmane.org>
2016-02-18 19:33 ` Stuart Yoder
2016-02-18 19:33 ` Stuart Yoder
2016-02-25 14:38 ` joro-zLv9SwRftAIdnm+yROfE0A [this message]
2016-02-25 14:38 ` joro at 8bytes.org
[not found] ` <20160225143855.GD16675-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2016-02-25 15:00 ` Will Deacon
2016-02-25 15:00 ` Will Deacon
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=20160225143855.GD16675@8bytes.org \
--to=joro-zlv9swrftaidnm+yrofe0a@public.gmane.org \
--cc=V.Sethi-3arQi8VN3Tc@public.gmane.org \
--cc=bharat.bhushan-3arQi8VN3Tc@public.gmane.org \
--cc=iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org \
--cc=linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org \
--cc=peter.newton-3arQi8VN3Tc@public.gmane.org \
--cc=stuart.yoder-3arQi8VN3Tc@public.gmane.org \
--cc=will.deacon-5wv7dgnIgG8@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.