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From: Zhai He <zhai.he@nxp.com>
To: Barry Song <baohua@kernel.org>
CC: Andrew Morton <akpm@linux-foundation.org>, "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.
Thread-Index: AQHavKBGxUJQI1jHm0WeihrG1yRS87HEeMkAgAAvWICAAE1E8IAAFNsAgAAdaCA=
Date: Thu, 13 Jun 2024 05:32:52 +0000
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> -----Original Message-----
> From: Barry Song <baohua@kernel.org>
> Sent: Thursday, June 13, 2024 11:28 AM
> To: Zhai He <zhai.he@nxp.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>; sboyd@kernel.org;
> linux-mm@kvack.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.
>=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 2:34=E2=80=AFPM Zhai He <zhai.he@nxp.com> =
wrote:
> >
> > > -----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.
> > >
> > > 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
> > >
> > >
> > > 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.
> > >
> > > 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.
> > >
> > > 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.
> > >
> > > 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.
> > >
> > Because we enabled secure heap to support widevine DRM, and secure
> > heap requires security configuration, its starting address cannot be
> > specified arbitrarily, which causes the default CMA to be reduced. =
So we
> reduced the CMA, but in order 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.
>=20
> I don=E2=80=99t quite understand what you are saying. Why =
can=E2=80=99t you increase VPU=E2=80=99s
> CMA size?
Thanks for your quick reply.
Because we added a secure heap to support Widevine DRM, this heap =
requires hardware protection, so its starting address cannot be =
specified arbitrarily. This causes the secure heap to occupy part of the =
default CMA, and the default CMA is therefore reduced, so in order to =
avoid default CMA Shrinking introduces other problems. We added a =
specific CMA area for the VPU. However, due to the large size of the =
secure heap and default CMA, There is no remaining memory available to =
increase specific CMA for VPU.

> It seems you mean that only in some corner cases do you need a large =
CMA, but
> most of the time, you don=E2=80=99t need it to be this big? So you =
have to "borrow"
> memory from the
> default CMA. but why not move that portion from the default CMA to =
your
> VPU=E2=80=99s CMA?
>=20
This is a method, but because for VPU, the continuous memory size =
allocated by the driver is based on the video stream, we cannot =
determine the maximum size of memory required by the VPU. This makes it =
impossible for us to determine the size of the specific CMA assigned to =
the VPU. Thanks.
> Thanks
> Barry

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