From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Rob Clark <robdclark@gmail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>,
LKML <linux-kernel@vger.kernel.org>,
"linux-media@vger.kernel.org" <linux-media@vger.kernel.org>,
DRI mailing list <dri-devel@lists.freedesktop.org>,
Linaro MM SIG Mailman List <linaro-mm-sig@lists.linaro.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Linaro Kernel Mailman List <linaro-kernel@lists.linaro.org>,
Tomasz Stanislawski <stanislawski.tomasz@googlemail.com>,
Robin Murphy <robin.murphy@arm.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Daniel Vetter <daniel@ffwll.ch>
Subject: Re: [RFCv3 2/2] dma-buf: add helpers for sharing attacher constraints with dma-parms
Date: Tue, 3 Feb 2015 14:37:15 +0000 [thread overview]
Message-ID: <20150203143715.GQ8656@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <CAF6AEGu0-TgyE4BjiaSWXQCSk31VU7dogq=6xDRUhi79rGgbxg@mail.gmail.com>
On Tue, Feb 03, 2015 at 09:04:03AM -0500, Rob Clark wrote:
> Since I'm stuck w/ an iommu, instead of built in mmu, my plan was to
> drop use of dma-mapping entirely (incl the current call to dma_map_sg,
> which I just need until we can use drm_cflush on arm), and
> attach/detach iommu domains directly to implement context switches.
> At that point, dma_addr_t really has no sensible meaning for me.
So how do you intend to import from a subsystem which only gives you
the dma_addr_t?
If you aren't passing system memory, you have no struct page. You can't
fake up a struct page. What this means is that struct scatterlist can't
represent it any other way.
--
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
WARNING: multiple messages have this Message-ID (diff)
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Rob Clark <robdclark@gmail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>,
LKML <linux-kernel@vger.kernel.org>,
"linux-media@vger.kernel.org" <linux-media@vger.kernel.org>,
DRI mailing list <dri-devel@lists.freedesktop.org>,
Linaro MM SIG Mailman List <linaro-mm-sig@lists.linaro.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Linaro Kernel Mailman List <linaro-kernel@lists.linaro.org>,
Tomasz Stanislawski <stanislawski.tomasz@googlemail.com>,
Robin Murphy <robin.murphy@arm.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Daniel Vetter <daniel@ffwll.ch>
Subject: Re: [RFCv3 2/2] dma-buf: add helpers for sharing attacher constraints with dma-parms
Date: Tue, 3 Feb 2015 14:37:15 +0000 [thread overview]
Message-ID: <20150203143715.GQ8656@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <CAF6AEGu0-TgyE4BjiaSWXQCSk31VU7dogq=6xDRUhi79rGgbxg@mail.gmail.com>
On Tue, Feb 03, 2015 at 09:04:03AM -0500, Rob Clark wrote:
> Since I'm stuck w/ an iommu, instead of built in mmu, my plan was to
> drop use of dma-mapping entirely (incl the current call to dma_map_sg,
> which I just need until we can use drm_cflush on arm), and
> attach/detach iommu domains directly to implement context switches.
> At that point, dma_addr_t really has no sensible meaning for me.
So how do you intend to import from a subsystem which only gives you
the dma_addr_t?
If you aren't passing system memory, you have no struct page. You can't
fake up a struct page. What this means is that struct scatterlist can't
represent it any other way.
--
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
WARNING: multiple messages have this Message-ID (diff)
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFCv3 2/2] dma-buf: add helpers for sharing attacher constraints with dma-parms
Date: Tue, 3 Feb 2015 14:37:15 +0000 [thread overview]
Message-ID: <20150203143715.GQ8656@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <CAF6AEGu0-TgyE4BjiaSWXQCSk31VU7dogq=6xDRUhi79rGgbxg@mail.gmail.com>
On Tue, Feb 03, 2015 at 09:04:03AM -0500, Rob Clark wrote:
> Since I'm stuck w/ an iommu, instead of built in mmu, my plan was to
> drop use of dma-mapping entirely (incl the current call to dma_map_sg,
> which I just need until we can use drm_cflush on arm), and
> attach/detach iommu domains directly to implement context switches.
> At that point, dma_addr_t really has no sensible meaning for me.
So how do you intend to import from a subsystem which only gives you
the dma_addr_t?
If you aren't passing system memory, you have no struct page. You can't
fake up a struct page. What this means is that struct scatterlist can't
represent it any other way.
--
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
WARNING: multiple messages have this Message-ID (diff)
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Rob Clark <robdclark@gmail.com>
Cc: Linaro Kernel Mailman List <linaro-kernel@lists.linaro.org>,
Robin Murphy <robin.murphy@arm.com>,
LKML <linux-kernel@vger.kernel.org>,
DRI mailing list <dri-devel@lists.freedesktop.org>,
Linaro MM SIG Mailman List <linaro-mm-sig@lists.linaro.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Tomasz Stanislawski <stanislawski.tomasz@googlemail.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-media@vger.kernel.org" <linux-media@vger.kernel.org>
Subject: Re: [RFCv3 2/2] dma-buf: add helpers for sharing attacher constraints with dma-parms
Date: Tue, 3 Feb 2015 14:37:15 +0000 [thread overview]
Message-ID: <20150203143715.GQ8656@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <CAF6AEGu0-TgyE4BjiaSWXQCSk31VU7dogq=6xDRUhi79rGgbxg@mail.gmail.com>
On Tue, Feb 03, 2015 at 09:04:03AM -0500, Rob Clark wrote:
> Since I'm stuck w/ an iommu, instead of built in mmu, my plan was to
> drop use of dma-mapping entirely (incl the current call to dma_map_sg,
> which I just need until we can use drm_cflush on arm), and
> attach/detach iommu domains directly to implement context switches.
> At that point, dma_addr_t really has no sensible meaning for me.
So how do you intend to import from a subsystem which only gives you
the dma_addr_t?
If you aren't passing system memory, you have no struct page. You can't
fake up a struct page. What this means is that struct scatterlist can't
represent it any other way.
--
FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up
according to speedtest.net.
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2015-02-03 14:37 UTC|newest]
Thread overview: 262+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-27 8:25 [RFCv3 1/2] device: add dma_params->max_segment_count Sumit Semwal
2015-01-27 8:25 ` Sumit Semwal
2015-01-27 8:25 ` Sumit Semwal
2015-01-27 8:25 ` [RFCv3 2/2] dma-buf: add helpers for sharing attacher constraints with dma-parms Sumit Semwal
2015-01-27 8:25 ` Sumit Semwal
2015-01-27 8:25 ` Sumit Semwal
2015-01-27 8:25 ` Sumit Semwal
2015-01-29 14:16 ` Maarten Lankhorst
2015-01-29 14:16 ` Maarten Lankhorst
2015-01-29 14:16 ` Maarten Lankhorst
2015-01-29 14:16 ` Maarten Lankhorst
2015-01-29 14:39 ` Russell King - ARM Linux
2015-01-29 14:39 ` Russell King - ARM Linux
2015-01-29 14:39 ` Russell King - ARM Linux
2015-01-29 14:39 ` Russell King - ARM Linux
2015-01-29 15:30 ` Sumit Semwal
2015-01-29 15:30 ` Sumit Semwal
2015-01-29 15:30 ` Sumit Semwal
2015-01-29 15:30 ` Sumit Semwal
2015-01-29 15:47 ` Russell King - ARM Linux
2015-01-29 15:47 ` Russell King - ARM Linux
2015-01-29 15:47 ` Russell King - ARM Linux
2015-01-29 15:47 ` Russell King - ARM Linux
2015-01-29 15:47 ` Russell King - ARM Linux
2015-01-29 16:55 ` Sumit Semwal
2015-01-29 16:55 ` Sumit Semwal
2015-01-29 16:55 ` Sumit Semwal
2015-01-29 16:55 ` Sumit Semwal
2015-01-29 18:52 ` Rob Clark
2015-01-29 18:52 ` Rob Clark
2015-01-29 18:52 ` Rob Clark
2015-01-29 18:52 ` Rob Clark
2015-01-29 18:52 ` Rob Clark
2015-01-29 19:26 ` Russell King - ARM Linux
2015-01-29 19:26 ` Russell King - ARM Linux
2015-01-29 19:26 ` Russell King - ARM Linux
2015-01-29 19:26 ` Russell King - ARM Linux
2015-01-29 19:26 ` Russell King - ARM Linux
2015-01-29 22:18 ` Rob Clark
2015-01-29 22:18 ` Rob Clark
2015-01-29 22:18 ` Rob Clark
2015-01-29 22:18 ` Rob Clark
2015-01-29 22:31 ` Russell King - ARM Linux
2015-01-29 22:31 ` Russell King - ARM Linux
2015-01-29 22:31 ` Russell King - ARM Linux
2015-01-29 22:31 ` Russell King - ARM Linux
2015-01-29 23:19 ` Rob Clark
2015-01-29 23:19 ` Rob Clark
2015-01-29 23:19 ` Rob Clark
2015-01-29 23:19 ` Rob Clark
2015-02-02 16:54 ` Daniel Vetter
2015-02-02 16:54 ` Daniel Vetter
2015-02-02 16:54 ` Daniel Vetter
2015-02-02 16:54 ` Daniel Vetter
2015-02-02 20:30 ` Rob Clark
2015-02-02 20:30 ` Rob Clark
2015-02-02 20:30 ` Rob Clark
2015-02-02 20:30 ` Rob Clark
2015-02-02 21:46 ` Russell King - ARM Linux
2015-02-02 21:46 ` Russell King - ARM Linux
2015-02-02 21:46 ` Russell King - ARM Linux
2015-02-02 21:46 ` Russell King - ARM Linux
2015-02-02 22:36 ` Rob Clark
2015-02-02 22:36 ` Rob Clark
2015-02-02 22:36 ` Rob Clark
2015-02-02 22:36 ` Rob Clark
2015-02-02 22:36 ` Rob Clark
2015-02-03 7:50 ` Daniel Vetter
2015-02-03 7:50 ` Daniel Vetter
2015-02-03 7:50 ` Daniel Vetter
2015-02-03 7:50 ` Daniel Vetter
2015-02-03 7:46 ` Daniel Vetter
2015-02-03 7:46 ` Daniel Vetter
2015-02-03 7:46 ` Daniel Vetter
2015-02-03 7:46 ` Daniel Vetter
2015-02-03 7:48 ` Daniel Vetter
2015-02-03 7:48 ` Daniel Vetter
2015-02-03 7:48 ` Daniel Vetter
2015-02-03 7:48 ` Daniel Vetter
2015-02-03 12:28 ` Russell King - ARM Linux
2015-02-03 12:28 ` Russell King - ARM Linux
2015-02-03 12:28 ` Russell King - ARM Linux
2015-02-03 12:28 ` Russell King - ARM Linux
2015-02-03 13:00 ` Daniel Vetter
2015-02-03 13:00 ` Daniel Vetter
2015-02-03 13:00 ` Daniel Vetter
2015-02-03 13:00 ` Daniel Vetter
2015-02-03 13:28 ` Christian Gmeiner
2015-02-03 13:28 ` Christian Gmeiner
2015-02-03 13:28 ` Christian Gmeiner
2015-02-03 13:28 ` Christian Gmeiner
2015-02-03 13:28 ` Christian Gmeiner
2015-02-03 14:32 ` Russell King - ARM Linux
2015-02-03 14:32 ` Russell King - ARM Linux
2015-02-03 14:32 ` Russell King - ARM Linux
2015-02-03 14:32 ` Russell King - ARM Linux
2015-02-03 14:32 ` Russell King - ARM Linux
2015-02-03 14:25 ` Rob Clark
2015-02-03 14:25 ` Rob Clark
2015-02-03 14:25 ` Rob Clark
2015-02-03 14:25 ` Rob Clark
2015-02-03 14:04 ` Rob Clark
2015-02-03 14:04 ` Rob Clark
2015-02-03 14:04 ` Rob Clark
2015-02-03 14:04 ` Rob Clark
2015-02-03 14:17 ` Arnd Bergmann
2015-02-03 14:17 ` Arnd Bergmann
2015-02-03 14:17 ` Arnd Bergmann
2015-02-03 14:17 ` Arnd Bergmann
2015-02-03 14:41 ` Russell King - ARM Linux
2015-02-03 14:41 ` Russell King - ARM Linux
2015-02-03 14:41 ` Russell King - ARM Linux
2015-02-03 14:41 ` Russell King - ARM Linux
2015-02-03 14:52 ` Arnd Bergmann
2015-02-03 14:52 ` Arnd Bergmann
2015-02-03 14:52 ` Arnd Bergmann
2015-02-03 15:22 ` Russell King - ARM Linux
2015-02-03 15:22 ` Russell King - ARM Linux
2015-02-03 15:22 ` Russell King - ARM Linux
2015-02-03 15:22 ` Russell King - ARM Linux
2015-02-03 15:31 ` [Linaro-mm-sig] " Arnd Bergmann
2015-02-03 15:31 ` Arnd Bergmann
2015-02-03 15:31 ` Arnd Bergmann
2015-02-03 15:54 ` Russell King - ARM Linux
2015-02-03 15:54 ` Russell King - ARM Linux
2015-02-03 15:54 ` Russell King - ARM Linux
2015-02-03 15:54 ` Russell King - ARM Linux
2015-02-03 16:12 ` Arnd Bergmann
2015-02-03 16:12 ` Arnd Bergmann
2015-02-03 16:12 ` Arnd Bergmann
2015-02-03 16:12 ` Arnd Bergmann
2015-02-03 16:22 ` Rob Clark
2015-02-03 16:22 ` Rob Clark
2015-02-03 16:22 ` Rob Clark
2015-02-03 16:22 ` Rob Clark
2015-02-03 16:36 ` Arnd Bergmann
2015-02-03 16:36 ` Arnd Bergmann
2015-02-03 16:36 ` Arnd Bergmann
2015-02-03 16:36 ` Arnd Bergmann
2015-02-03 16:36 ` Arnd Bergmann
2015-02-03 20:04 ` Daniel Vetter
2015-02-03 20:04 ` Daniel Vetter
2015-02-03 20:04 ` Daniel Vetter
2015-02-03 20:04 ` Daniel Vetter
2015-02-03 21:42 ` Arnd Bergmann
2015-02-03 21:42 ` Arnd Bergmann
2015-02-03 21:42 ` Arnd Bergmann
2015-02-03 21:42 ` Arnd Bergmann
2015-02-03 21:42 ` Arnd Bergmann
2015-02-03 22:07 ` Daniel Vetter
2015-02-03 22:07 ` Daniel Vetter
2015-02-03 22:07 ` Daniel Vetter
2015-02-03 22:07 ` Daniel Vetter
2015-02-04 0:14 ` Russell King - ARM Linux
2015-02-04 0:14 ` Russell King - ARM Linux
2015-02-04 0:14 ` Russell King - ARM Linux
2015-02-04 0:14 ` Russell King - ARM Linux
2015-02-03 17:01 ` Russell King - ARM Linux
2015-02-03 17:01 ` Russell King - ARM Linux
2015-02-03 17:01 ` Russell King - ARM Linux
2015-02-03 17:01 ` Russell King - ARM Linux
2015-02-03 17:01 ` Russell King - ARM Linux
2015-02-03 16:58 ` Russell King - ARM Linux
2015-02-03 16:58 ` Russell King - ARM Linux
2015-02-03 16:58 ` Russell King - ARM Linux
2015-02-03 16:58 ` Russell King - ARM Linux
2015-02-03 17:35 ` Rob Clark
2015-02-03 17:35 ` Rob Clark
2015-02-03 17:35 ` Rob Clark
2015-02-03 17:35 ` Rob Clark
2015-02-03 20:08 ` Daniel Vetter
2015-02-03 20:08 ` Daniel Vetter
2015-02-03 20:08 ` Daniel Vetter
2015-02-03 20:08 ` Daniel Vetter
2015-02-03 20:08 ` Daniel Vetter
2015-02-03 21:44 ` Arnd Bergmann
2015-02-03 21:44 ` Arnd Bergmann
2015-02-03 21:44 ` Arnd Bergmann
2015-02-03 21:44 ` Arnd Bergmann
2015-02-03 21:44 ` Arnd Bergmann
2015-02-03 15:25 ` Rob Clark
2015-02-03 15:25 ` Rob Clark
2015-02-03 15:25 ` Rob Clark
2015-02-03 15:25 ` Rob Clark
2015-02-03 15:19 ` Rob Clark
2015-02-03 15:19 ` Rob Clark
2015-02-03 15:19 ` Rob Clark
2015-02-03 15:19 ` Rob Clark
2015-02-03 14:37 ` Russell King - ARM Linux [this message]
2015-02-03 14:37 ` Russell King - ARM Linux
2015-02-03 14:37 ` Russell King - ARM Linux
2015-02-03 14:37 ` Russell King - ARM Linux
2015-02-03 14:37 ` Russell King - ARM Linux
2015-02-03 14:44 ` Rob Clark
2015-02-03 14:44 ` Rob Clark
2015-02-03 14:44 ` Rob Clark
2015-02-03 14:44 ` Rob Clark
2015-02-03 14:58 ` Russell King - ARM Linux
2015-02-03 14:58 ` Russell King - ARM Linux
2015-02-03 14:58 ` Russell King - ARM Linux
2015-02-03 14:58 ` Russell King - ARM Linux
2015-02-03 14:58 ` Russell King - ARM Linux
2015-02-02 5:53 ` Sumit Semwal
2015-02-02 5:53 ` Sumit Semwal
2015-02-02 5:53 ` Sumit Semwal
2015-02-02 5:53 ` Sumit Semwal
2015-02-11 8:28 ` Marek Szyprowski
2015-02-11 8:28 ` Marek Szyprowski
2015-02-11 8:28 ` Marek Szyprowski
2015-02-11 11:12 ` Russell King - ARM Linux
2015-02-11 11:12 ` Russell King - ARM Linux
2015-02-11 11:12 ` Russell King - ARM Linux
2015-02-11 11:12 ` Russell King - ARM Linux
2015-02-11 11:23 ` Rob Clark
2015-02-11 11:23 ` Rob Clark
2015-02-11 11:23 ` Rob Clark
2015-02-11 11:23 ` Rob Clark
2015-02-11 11:23 ` Rob Clark
2015-02-11 12:56 ` Daniel Vetter
2015-02-11 12:56 ` Daniel Vetter
2015-02-11 12:56 ` Daniel Vetter
2015-02-11 12:56 ` Daniel Vetter
2015-02-11 12:56 ` Daniel Vetter
2015-02-11 13:30 ` Rob Clark
2015-02-11 13:30 ` Rob Clark
2015-02-11 13:30 ` Rob Clark
2015-02-11 13:30 ` Rob Clark
2015-02-11 13:30 ` Rob Clark
2015-02-11 12:20 ` Marek Szyprowski
2015-02-11 12:20 ` Marek Szyprowski
2015-02-11 12:20 ` Marek Szyprowski
2015-02-11 16:23 ` Russell King - ARM Linux
2015-02-11 16:23 ` Russell King - ARM Linux
2015-02-11 16:23 ` Russell King - ARM Linux
2015-02-11 16:23 ` Russell King - ARM Linux
2015-05-05 14:41 ` Sumit Semwal
2015-05-05 14:41 ` Sumit Semwal
2015-05-05 14:41 ` Sumit Semwal
2015-05-05 14:41 ` Sumit Semwal
2015-06-03 6:39 ` [Linaro-mm-sig] " Hans Verkuil
2015-06-03 6:39 ` Hans Verkuil
2015-06-03 6:39 ` Hans Verkuil
2015-06-03 6:39 ` Hans Verkuil
2015-06-03 8:41 ` Russell King - ARM Linux
2015-06-03 8:41 ` Russell King - ARM Linux
2015-06-03 8:41 ` Russell King - ARM Linux
2015-06-03 8:41 ` Russell King - ARM Linux
2015-06-03 8:41 ` Russell King - ARM Linux
2015-06-03 9:37 ` Hans Verkuil
2015-06-03 9:37 ` Hans Verkuil
2015-06-03 9:37 ` Hans Verkuil
2015-06-03 9:37 ` Hans Verkuil
2015-06-04 5:24 ` Sumit Semwal
2015-06-04 5:24 ` Sumit Semwal
2015-06-04 5:24 ` Sumit Semwal
2015-06-04 5:24 ` Sumit Semwal
2015-01-28 14:09 ` [RFCv3 1/2] device: add dma_params->max_segment_count Marek Szyprowski
2015-01-28 14:09 ` Marek Szyprowski
2015-01-28 14:09 ` Marek Szyprowski
2015-06-03 6:13 ` [Linaro-mm-sig] " Hans Verkuil
2015-06-03 6:13 ` Hans Verkuil
2015-06-03 6:13 ` Hans Verkuil
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