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
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...
Thanks
--
~Vinod
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