On Tue, Jun 25, 2013 at 11:23:21AM +0200, Daniel Vetter wrote:
> Just a quick question on your assertion that we need all four
> functions: Since we already have begin/end_cpu_access functions
> (intention here was to allow the dma_buf exporter to ensure the memory
> is pinned, e.g. for swapable ge
On Tue, Jun 18, 2013 at 12:46 PM, Russell King - ARM Linux
wrote:
>> > Note: the existing stuff does have the nice side effect of being able
>> > to pass buffers which do not have a struct page * associated with them
>> > through the dma_buf API - I think we can still preserve that by having
>> >
2013/6/22 Jerome Glisse :
> On Fri, Jun 21, 2013 at 12:55 PM, Inki Dae wrote:
>> 2013/6/21 Lucas Stach :
>>> Hi Inki,
>>>
>>> please refrain from sending HTML Mails, it makes proper quoting without
>>> messing up the layout everywhere pretty hard.
>>>
>>
>> Sorry about that. I should have used tex
...@vger.kernel.org; linux-arm-ker...@lists.infradead.org
> > > Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer synchronization
> > > framework
> > >
> > > On Thu, Jun 20, 2013 at 12:10:04AM +0900, Inki Dae wrote:
> > > > On the other ha
On Fri, Jun 21, 2013 at 12:55 PM, Inki Dae wrote:
> 2013/6/21 Lucas Stach :
>> Hi Inki,
>>
>> please refrain from sending HTML Mails, it makes proper quoting without
>> messing up the layout everywhere pretty hard.
>>
>
> Sorry about that. I should have used text mode.
>
>> Am Freitag, den 21.06.2
2013/6/21 Lucas Stach :
> Hi Inki,
>
> please refrain from sending HTML Mails, it makes proper quoting without
> messing up the layout everywhere pretty hard.
>
Sorry about that. I should have used text mode.
> Am Freitag, den 21.06.2013, 20:01 +0900 schrieb Inki Dae:
> [...]
>
>> Yeah, y
Hi Inki,
please refrain from sending HTML Mails, it makes proper quoting without
messing up the layout everywhere pretty hard.
Am Freitag, den 21.06.2013, 20:01 +0900 schrieb Inki Dae:
[...]
> Yeah, you'll some knowledge and understanding about the API
> you are
> working
2013/6/21 Lucas Stach
> Am Donnerstag, den 20.06.2013, 20:15 +0900 schrieb Inki Dae:
> [...]
> > > > > You already need some kind of IPC between the two tasks, as I
> suspect
> > > > > even in your example it wouldn't make much sense to queue the
> buffer
> > > > > over and over again in task B w
Am Donnerstag, den 20.06.2013, 20:15 +0900 schrieb Inki Dae:
[...]
> > > > You already need some kind of IPC between the two tasks, as I suspect
> > > > even in your example it wouldn't make much sense to queue the buffer
> > > > over and over again in task B without task A writing anything to it.
min Park'; 'myungjoo.ham'; 'DRI mailing list'; linux-arm-
> ker...@lists.infradead.org; linux-me...@vger.kernel.org
> Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer synchronization
> framework
>
> Am Donnerstag, den 20.06.2013, 17:24 +0900 schrieb Inki Dae:
&
Am Donnerstag, den 20.06.2013, 17:24 +0900 schrieb Inki Dae:
[...]
> > > In addition, please see the below more detail examples.
> > >
> > > The conventional way (without dmabuf-sync) is:
> > > Task A
> > >
> > > 1. CPU accesses buf
> > > 2. Send the buf to Task B
> >
Inki Dae
> > > > Cc: linux-fbdev; DRI mailing list; Kyungmin Park; myungjoo.ham; YoungJun
> > > > Cho; linux-me...@vger.kernel.org; linux-arm-ker...@lists.infradead.org
> > > > Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer
> > > > synchroni
min Park'; 'myungjoo.ham'; 'DRI mailing list'; linux-arm-
> ker...@lists.infradead.org; linux-me...@vger.kernel.org
> Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer synchronization
> framework
>
> Am Donnerstag, den 20.06.2013, 15:43 +090
l King - ARM Linux
> > Sent: Thursday, June 20, 2013 3:29 AM
> > To: Inki Dae
> > Cc: linux-fbdev; DRI mailing list; Kyungmin Park; myungjoo.ham; YoungJun
> > Cho; linux-me...@vger.kernel.org; linux-arm-ker...@lists.infradead.org
> > Subject: Re: [RFC PATCH v2] dmabuf-sync: I
ux-fbdev; DRI mailing list; Kyungmin Park; myungjoo.ham; YoungJun
> Cho; linux-me...@vger.kernel.org; linux-arm-ker...@lists.infradead.org
> Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer synchronization
> framework
>
> On Thu, Jun 20, 2013 at 12:10:04AM +0900, Inki Dae wro
On Thu, Jun 20, 2013 at 12:10:04AM +0900, Inki Dae wrote:
> On the other hand, the below shows how we could enhance the conventional
> way with my approach (just example):
>
> CPU -> DMA,
> ioctl(qbuf command) ioctl(streamon)
> |
> > Cc: 'Russell King - ARM Linux'; 'linux-fbdev'; 'Kyungmin Park'; 'DRI
> > > mailing list'; 'myungjoo.ham'; 'YoungJun Cho'; linux-arm-
> > > ker...@lists.infradead.org; linux-me...@vger.kernel.org
> > > Sub
x-fbdev'; 'Kyungmin Park'; 'DRI
> > mailing list'; 'myungjoo.ham'; 'YoungJun Cho'; linux-arm-
> > ker...@lists.infradead.org; linux-me...@vger.kernel.org
> > Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer synchronization
> &
o.ham'; 'YoungJun Cho'; linux-arm-
> ker...@lists.infradead.org; linux-me...@vger.kernel.org
> Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer synchronization
> framework
>
> Am Mittwoch, den 19.06.2013, 14:45 +0900 schrieb Inki Dae:
> >
> > >
x-fbdev'; 'Kyungmin Park'; 'DRI
> > mailing list'; 'myungjoo.ham'; 'YoungJun Cho'; linux-arm-
> > ker...@lists.infradead.org; linux-me...@vger.kernel.org
> > Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer synchronization
>
o.ham'; 'YoungJun Cho'; linux-arm-
> ker...@lists.infradead.org; linux-me...@vger.kernel.org
> Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer synchronization
> framework
>
> Am Dienstag, den 18.06.2013, 18:04 +0900 schrieb Inki Dae:
> [...]
> >
&
On Tue, Jun 18, 2013 at 09:00:16AM +0200, Daniel Vetter wrote:
> On Mon, Jun 17, 2013 at 04:42:37PM +0100, Russell King - ARM Linux wrote:
> > What we need is something along the lines of:
> > (a) dma_buf_map_attachment() _not_ to map the scatterlist for DMA.
> > or
> > (b) drm_gem_prime_import() n
; 'linux-fbdev'; 'Kyungmin Park'; 'DRI mailing
> > list'; 'Rob Clark'; 'myungjoo.ham'; 'YoungJun Cho'; 'Daniel Vetter';
> > linux-arm-ker...@lists.infradead.org; linux-me...@vger.kernel.org
> > Subject: Re: [RFC P
On Tue, Jun 18, 2013 at 02:27:40PM +0900, Inki Dae wrote:
> So I'd like to ask for other DRM maintainers. How do you think about it? it
> seems like that Intel DRM (maintained by Daniel), OMAP DRM (maintained by
> Rob) and GEM CMA helper also have same issue Russell pointed out. I think
> not only
Am Dienstag, den 18.06.2013, 18:04 +0900 schrieb Inki Dae:
[...]
>
> > a display device driver. It shouldn't be used within a single driver
> > as a means of passing buffers between userspace and kernel space.
>
> What I try to do is not really such ugly thing. What I try to do is to
> notify th
#x27;Rob Clark'; 'myungjoo.ham'; 'YoungJun Cho'; 'Daniel Vetter';
> linux-arm-ker...@lists.infradead.org; linux-me...@vger.kernel.org
> Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer synchronization
> framework
>
> On Tue, Jun 18, 2013 at 02
On Mon, Jun 17, 2013 at 04:42:37PM +0100, Russell King - ARM Linux wrote:
> On Tue, Jun 18, 2013 at 12:03:31AM +0900, Inki Dae wrote:
> > 2013/6/17 Russell King - ARM Linux
> > Exactly right. But that is not definitely my point. Could you please see
> > the below simple example?:
> > (Presume that
; linux-arm-
> ker...@lists.infradead.org; linux-me...@vger.kernel.org
> Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer synchronization
> framework
>
> On Tue, Jun 18, 2013 at 02:19:04AM +0900, Inki Dae wrote:
> > It seems like that all pages of the scatterlist shoul
On Tue, Jun 18, 2013 at 02:19:04AM +0900, Inki Dae wrote:
> It seems like that all pages of the scatterlist should be mapped with
> DMA every time DMA operation is started (or drm_xxx_set_src_dma_buffer
> function call), and the pages should be unmapped from DMA again every
> time DMA operation is
2013/6/18 Russell King - ARM Linux
> On Tue, Jun 18, 2013 at 12:03:31AM +0900, Inki Dae wrote:
> > 2013/6/17 Russell King - ARM Linux
> > Exactly right. But that is not definitely my point. Could you please see
> > the below simple example?:
> > (Presume that CPU and DMA share a buffer and the b
On Mon, Jun 17, 2013 at 04:42:37PM +0100, Russell King - ARM Linux wrote:
> On Tue, Jun 18, 2013 at 12:03:31AM +0900, Inki Dae wrote:
> > 2013/6/17 Russell King - ARM Linux
> > Exactly right. But that is not definitely my point. Could you please see
> > the below simple example?:
> > (Presume that
On Tue, Jun 18, 2013 at 12:03:31AM +0900, Inki Dae wrote:
> 2013/6/17 Russell King - ARM Linux
> Exactly right. But that is not definitely my point. Could you please see
> the below simple example?:
> (Presume that CPU and DMA share a buffer and the buffer is mapped with user
> space as cachable)
>> Cc: dri-devel@lists.freedesktop.org; linux-fb...@vger.kernel.org;
> linux-
> >> arm-ker...@lists.infradead.org; linux-me...@vger.kernel.org;
> >> dan...@ffwll.ch; robdcl...@gmail.com; kyungmin.p...@samsung.com;
> >> myungjoo....@samsung.com; yj44@samsung.com
> >&g
2013/6/17 Russell King - ARM Linux
> On Mon, Jun 17, 2013 at 10:04:45PM +0900, Inki Dae wrote:
> > It's just to implement a thin sync framework coupling cache operation.
> This
> > approach is based on dma-buf for more generic implementation against
> android
> > sync driver or KDS.
> >
> > The d
On Mon, Jun 17, 2013 at 10:04:45PM +0900, Inki Dae wrote:
> It's just to implement a thin sync framework coupling cache operation. This
> approach is based on dma-buf for more generic implementation against android
> sync driver or KDS.
>
> The described steps may be summarized as:
> lock ->
ger.kernel.org; linux-
>> arm-ker...@lists.infradead.org; linux-me...@vger.kernel.org;
>> dan...@ffwll.ch; robdcl...@gmail.com; kyungmin.p...@samsung.com;
>> myungjoo....@samsung.com; yj44....@samsung.com
>> Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer synchronization
>> fram
.kernel.org;
> dan...@ffwll.ch; robdcl...@gmail.com; kyungmin.p...@samsung.com;
> myungjoo@samsung.com; yj44@samsung.com
> Subject: Re: [RFC PATCH v2] dmabuf-sync: Introduce buffer synchronization
> framework
>
> Op 17-06-13 13:15, Inki Dae schreef:
> > This patch adds a
Op 17-06-13 13:15, Inki Dae schreef:
> This patch adds a buffer synchronization framework based on DMA BUF[1]
> and reservation[2] to use dma-buf resource, and based on ww-mutexes[3]
> for lock mechanism.
>
> The purpose of this framework is not only to couple cache operations,
> and buffer access
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