From: Amit Pundir <amit.pundir@linaro.org>
To: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc: lkml <linux-kernel@vger.kernel.org>,
jeremy.linton@arm.com, Sumit Semwal <sumit.semwal@linaro.org>,
iommu@lists.linux-foundation.org,
John Stultz <john.stultz@linaro.org>,
linux-rpi-kernel@lists.infradead.org,
David Rientjes <rientjes@google.com>,
Robin Murphy <robin.murphy@arm.com>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH] dma-pool: Do not allocate pool memory from CMA
Date: Fri, 24 Jul 2020 16:36:52 +0530 [thread overview]
Message-ID: <CAMi1Hd3O2HHBsnt=sac7FdcW0-3=4S3g_F9f__2h5gTsudfirA@mail.gmail.com> (raw)
In-Reply-To: <0dc1e922bf87fa73790e7471b3974528dd261486.camel@suse.de>
On Fri, 24 Jul 2020 at 15:06, Nicolas Saenz Julienne
<nsaenzjulienne@suse.de> wrote:
>
> Hi Amit,
>
> On Thu, 2020-07-23 at 10:44 +0530, Amit Pundir wrote:
> > Hi Nicolas,
> >
> > Sorry I got stuck on other things yesterday.
>
> No worries :)
>
> > On Tue, 21 Jul 2020 at 21:57, Nicolas Saenz Julienne
>
> [...]
>
> > >
> > > Let's get a bigger hammer, I'm just looking for clues here. Can you
> > > apply this and provide the dmesg output.
> > >
> > > diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
> > > index 6bc74a2d5127..2160676bf488 100644
> > > --- a/kernel/dma/pool.c
> > > +++ b/kernel/dma/pool.c
> > > @@ -268,6 +268,8 @@ void *dma_alloc_from_pool(struct device *dev, size_t size,
> > > schedule_work(&atomic_pool_work);
> > > }
> > >
> > > + dev_info(dev, "%s: size %lx, phys addr %llx, flags 0x%x\n", __func__, size, phys, flags);
> > > +
> > > return ptr;
> > > }
> >
> > I never made it to dma_alloc_from_pool() call from
> > dma_direct_alloc_pages(), dma_should_alloc_from_pool() returns False
> > from gfpflags_allow_blocking() block.
>
> I'm a little sceptical about this. The only way you can get memory from these
> pools is through dma_alloc_from_pool(), and given how changes in the pool
> initialization affected the phone, it's pretty clear some amount of pool
> allocation is happening.
Maybe from here iommu_dma_alloc_remap()?
I see two paths to dma_alloc_from_pool(), one from
dma_direct_alloc_pages() which I mentioned above and
2nd one is thru iommu_dma_alloc(), but the flow doesn't
reach up to dma_alloc_from_pool(), and always returns
from iommu_dma_alloc_remap().
Regards,
Amit Pundir
>
> Regards,
> Nicolas
>
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next prev parent reply other threads:[~2020-07-24 11:07 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-08 16:49 [PATCH] dma-pool: Do not allocate pool memory from CMA Nicolas Saenz Julienne
2020-07-08 16:58 ` Christoph Hellwig
2020-07-08 23:14 ` Jeremy Linton
2020-07-09 21:47 ` David Rientjes via iommu
2020-07-21 7:21 ` Amit Pundir
2020-07-21 8:39 ` Nicolas Saenz Julienne
2020-07-21 8:54 ` Amit Pundir
2020-07-21 11:15 ` Nicolas Saenz Julienne
2020-07-21 11:28 ` Christoph Hellwig
2020-07-21 11:37 ` Nicolas Saenz Julienne
2020-07-21 12:16 ` Amit Pundir
2020-07-21 12:15 ` Amit Pundir
2020-07-21 12:45 ` Nicolas Saenz Julienne
2020-07-21 15:22 ` Amit Pundir
2020-07-21 16:27 ` Nicolas Saenz Julienne
2020-07-23 5:14 ` Amit Pundir
2020-07-24 9:36 ` Nicolas Saenz Julienne
2020-07-24 11:06 ` Amit Pundir [this message]
2020-07-24 13:41 ` Christoph Hellwig
2020-07-24 16:19 ` Amit Pundir
2020-07-24 16:27 ` Christoph Hellwig
2020-07-27 17:56 ` Nicolas Saenz Julienne
2020-07-28 9:13 ` Christoph Hellwig
2020-07-28 9:30 ` Nicolas Saenz Julienne
2020-07-28 10:09 ` Christoph Hellwig
2020-07-31 1:10 ` Nathan Chancellor
2020-07-31 7:19 ` Amit Pundir
2020-07-31 10:09 ` Nicolas Saenz Julienne
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