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From: Zhai He <zhai.he@nxp.com>
To: Barry Song <baohua@kernel.org>, Andrew Morton <akpm@linux-foundation.org>
CC: "sboyd@kernel.org" <sboyd@kernel.org>, "linux-mm@kvack.org"
	<linux-mm@kvack.org>, "linux-kernel@vger.kernel.org"
	<linux-kernel@vger.kernel.org>, Zhipeng Wang <zhipeng.wang_1@nxp.com>,
	Jindong Yue <jindong.yue@nxp.com>, Christoph Hellwig <hch@lst.de>
Subject: RE: [EXT] Re: [PATCH v2] Supports to use the default CMA when the
 device-specified CMA memory is not enough.
Thread-Topic: [EXT] Re: [PATCH v2] Supports to use the default CMA when the
 device-specified CMA memory is not enough.
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Date: Thu, 13 Jun 2024 02:34:45 +0000
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> -----Original Message-----
> From: Barry Song <baohua@kernel.org>
> Sent: Thursday, June 13, 2024 5:37 AM
> To: Andrew Morton <akpm@linux-foundation.org>
> Cc: Zhai He <zhai.he@nxp.com>; sboyd@kernel.org; linux-mm@kvack.org;
> linux-kernel@vger.kernel.org; stable@vger.kernel.org; Zhipeng Wang
> <zhipeng.wang_1@nxp.com>; Jindong Yue <jindong.yue@nxp.com>; Christoph
> Hellwig <hch@lst.de>
> Subject: [EXT] Re: [PATCH v2] Supports to use the default CMA when the
> device-specified CMA memory is not enough.
>=20
> Caution: This is an external email. Please take care when clicking =
links or
> opening attachments. When in doubt, report the message using the =
'Report this
> email' button
>=20
>=20
> On Thu, Jun 13, 2024 at 6:47=E2=80=AFAM Andrew Morton =
<akpm@linux-foundation.org>
> wrote:
> >
> > On Wed, 12 Jun 2024 16:12:16 +0800 "zhai.he" <zhai.he@nxp.com> =
wrote:
> >
> > > From: He Zhai <zhai.he@nxp.com>
> >
> > (cc Barry & Christoph)
> >
> > What was your reason for adding cc:stable to the email headers?  =
Does
> > this address some serious problem?  If so, please fully describe =
that
> > problem.
> >
> > > In the current code logic, if the device-specified CMA memory
> > > allocation fails, memory will not be allocated from the default =
CMA area.
> > > This patch will use the default cma region when the device's
> > > specified CMA is not enough.
> > >
> > > In addition, the log level of allocation failure is changed to =
debug.
> > > Because these logs will be printed when memory allocation from the
> > > device specified CMA fails, but if the allocation fails, it will =
be
> > > allocated from the default cma area. It can easily mislead =
developers'
> > > judgment.
>=20
> I am not convinced that this patch is correct. If device-specific CMA =
is too small,
> why not increase it in the device tree? Conversely, if the default CMA =
size is too
> large, why not reduce it via the cmdline?  CMA offers all kinds of =
flexible
> configuration options based on users=E2=80=99 needs.
>=20
> One significant benefit of device-specific CMA is that it helps =
decrease
> fragmentation in the common CMA pool. While many devices allocate =
memory
> from the same pool, they have different memory requirements in terms =
of sizes
> and alignments. Occasions of memory allocation and release can lead to
> situations where the CMA pool has enough free space, yet someone fails =
to
> obtain contiguous memory from it.
>=20
> This patch entirely negates the advantage we gain from device-specific =
CMA.
> My point is that instead of modifying the core code, please consider =
correcting
> your device tree or cmdline configurations.
>=20
Because we enabled secure heap to support widevine DRM, and secure heap =
requires security configuration, its starting=20
address cannot be specified arbitrarily, which causes the default CMA to =
be reduced. So we reduced the CMA, but in order=20
to avoid the impact of reducing the CMA, we used a multi-segment CMA and =
gave one segment to the VPU.

However, under our memory configuration, the device-specific CMA is not =
enough to support the VPU decoding high-resolution code streams, so this =
patch is added so that the VPU can work properly.
Thanks.
> > >
> > > ...
> > >
> > > --- a/kernel/dma/contiguous.c
> > > +++ b/kernel/dma/contiguous.c
> > > @@ -357,8 +357,13 @@ struct page *dma_alloc_contiguous(struct =
device
> *dev, size_t size, gfp_t gfp)
> > >       /* CMA can be used only in the context which permits =
sleeping */
> > >       if (!gfpflags_allow_blocking(gfp))
> > >               return NULL;
> > > -     if (dev->cma_area)
> > > -             return cma_alloc_aligned(dev->cma_area, size, gfp);
> > > +     if (dev->cma_area) {
> > > +             struct page *page =3D NULL;
> > > +
> > > +             page =3D cma_alloc_aligned(dev->cma_area, size, =
gfp);
> > > +             if (page)
> > > +                     return page;
> > > +     }
> > >       if (size <=3D PAGE_SIZE)
> > >               return NULL;
> >
> > The dma_alloc_contiguous() kerneldoc should be updated for this.
> >
> > The patch prompts the question "why does the device-specified CMA =
area
> > exist?".  Why not always allocate from the global pool?  If the
> > device-specified area exists to prevent one device from going crazy
> > and consuming too much contiguous memory, this patch violates that =
intent?
> >
> > > @@ -406,6 +411,8 @@ void dma_free_contiguous(struct device *dev,
> struct page *page, size_t size)
> > >       if (dev->cma_area) {
> > >               if (cma_release(dev->cma_area, page, count))
> > >                       return;
> > > +             if (cma_release(dma_contiguous_default_area, page,
> count))
> > > +                     return;
> > >       } else {
> > >               /*
> > >                * otherwise, page is from either per-numa cma or
> > > default cma diff --git a/mm/cma.c b/mm/cma.c index
> > > 3e9724716bad..6e12faf1bea7 100644
> > > --- a/mm/cma.c
> > > +++ b/mm/cma.c
> > > @@ -495,8 +495,8 @@ struct page *cma_alloc(struct cma *cma, =
unsigned
> long count,
> > >       }
> > >
> > >       if (ret && !no_warn) {
> > > -             pr_err_ratelimited("%s: %s: alloc failed, req-size: =
%lu pages,
> ret: %d\n",
> > > -                                __func__, cma->name, count, ret);
> > > +             pr_debug("%s: alloc failed, req-size: %lu pages, =
ret: %d, try
> to use default cma\n",
> > > +                         cma->name, count, ret);
> > >               cma_debug_show_areas(cma);
> > >       }
> >
>=20
> Thanks
> Barry

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