Hi Vinod,
On Tuesday 09 December 2014 12:09:12 Vinod Koul wrote:
> On Mon, Dec 08, 2014 at 11:20:44PM +0530, Vinod Koul wrote:
> > On Mon, Dec 08, 2014 at 07:40:15PM +0200, Laurent Pinchart wrote:
> > > > > [GIT PULL FOR v3.19] R-Car DMA engine driver
> > > > > http://www.spinics.net/lists/linux-sh/msg37764.html
> > > >
> > > > And I dont seem to have this request in my Inbox :(
> > > > Yes I do see it in archieves, so not sure how this is not present, not
> > > > sure if the servers mangeled it!!
> > >
> > > I haven't CC'ed you, I'll make sure to do so next time. The mail should
> > > still have reached you through the mailing list though (I assume you're
> > > subscribed to dmaeng...@vger.kernel.org ;-)).
> >
> > Yes I am, so should have reached me even though i wasnt cced
> > I do see email reaching me from list without me being in CC, but then it
> > wont hit my inbox and go to ML folder :)
> > So generally its a good practice to CC relvant folks, lots of folks do ask
> > that if ML is high volume
>
> Hey Laurent,
>
> I see that the oddity in commitlogs with change since artifacts after SOB,
> can you please fix that up
My bad. I've fixed the problem and pushed the result to the same branch
git://linuxtv.org/pinchartl/fbdev.git dma/next
The only difference lies in the commit logs.
> commit 43dc9ba2b51ccb9124bf6fed614c5053500592a6
> Author: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
> Date: Sat Jul 19 00:05:14 2014 +0200
>
> dmaengine: rcar-dmac: Cache hardware descriptors memory
>
> Unlike DMA transfers descriptors that are preallocated and cached,
> memory used to store hardware descriptors is allocated and freed
> with
> the DMA coherent allocation API for every transfer. Besides
> degrading
> performances, this creates a CMA stress test that seems to cause
> issues. Running dmatest with the noverify option produces
>
> [ 50.066539] alloc_contig_range test_pages_isolated(6b845, 6b846)
> failed [ 50.235180] alloc_contig_range test_pages_isolated(6b848, 6b84e)
> failed [ 52.964584] alloc_contig_range test_pages_isolated(6b847, 6b848)
> failed [ 54.127113] alloc_contig_range test_pages_isolated(6b843, 6b844)
> failed [ 56.270253] alloc_contig_range test_pages_isolated(6b84c, 6b850)
> failed
>
> The root cause needs to be fixed, but in the meantime, as a
workaround
> and a performance improvement, cache hardware descriptors.
>
> Signed-off-by: Laurent Pinchart
> <laurent.pinchart+rene...@ideasonboard.com> Tested-by: Wolfram Sang
> <wsa+rene...@sang-engineering.com>
>
> ---
>
> Changes since v2:
>
> - Typo fixes
> - Align allocated hwdesc size to page size
> - Ignore allocated hwdesc memory when the transfer doesn't use
hwdescs
>
> commit feb2e9f12b1a4a871b1d3eb2e2f44255510a79d3
> Author: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
> Date: Wed Jul 16 23:15:48 2014 +0200
>
> dmaengine: rcar-dmac: Implement support for hardware descriptor
> lists
>
> The DMAC supports hardware-based auto-configuration from descriptor
> lists. This reduces the number of interrupts required for
> processing
a
> DMA transfer. Support that mode in the driver.
>
> Signed-off-by: Laurent Pinchart
> <laurent.pinchart+rene...@ideasonboard.com> Tested-by: Wolfram Sang
> <wsa+rene...@sang-engineering.com>
>
> ---
>
> Changes since v2:
>
> - Typo fixes
> - Use GFP_NOWAIT to allocate hardware descriptors
> - Clear descriptor stage end interrupt when halting the channel
>
> and many more...
--
Regards,
Laurent Pinchart
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