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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:
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Date: Thu, 13 Jun 2024 07:11:07 +0000
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> -----Original Message-----
> From: Barry Song <baohua@kernel.org>
> Sent: Thursday, June 13, 2024 2:15 PM
> 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 5:32=E2=80=AFPM Zhai He <zhai.he@nxp.com> =
wrote:
> >
> > > -----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.
> > >
> > > 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 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.
> > >
> > > 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.
>=20
> I assume the secure heap you are referring to is a section of memory =
that
> should only be accessed by TrustZone and not be visible to Linux =
running in
> non-secure mode. How do you allocate this secure heap from the default =
CMA?

No, secure heap is a reserved memory, secure heap is not allocated from =
CMA, secure heap has been reserved during the kernel startup phase.
And this reserved memory is protected by hardware. Only specific =
hardware and secure world can accessed it.
For example:
&{/reserved-memory/} {
        secure_region: secure {
                compatible =3D "imx-secure-ion-pool";
                reg =3D <0x0 0xA0000000 0 0x1EF00000>;
        };
};

> Do you use the cma_alloc() APIs or the dma_alloc_coherent() APIs? =
Given that
> the VPU has its own device-specific CMA, why is this secure heap =
allocated
> from the default CMA instead of the VPU's CMA?
>=20
The VPU driver will use dma_alloc_coherent() to allocate contiguous =
memory. The secure heap is not allocated from the CMA, but because the =
secure heap is enabled, it occupies some contiguous memory, causing the =
default CMA to be reduced.

> If this secure heap was allocated before the kernel booted, why did =
the
> kernel(your dts) fail to mark this area as nomap/reserved to prevent =
the
> default CMA from intersecting with it?
>=20
Secure heap does not intersect with the CMA.
for example:
before secure heap enabled:
0xA000 0000 ~ 0xFFFFFFFF: default CMA
after secure heap enabled:
0x9000 0000 ~0x9FFF FFFF is the CMA specified by VPU,
0xA000 0000 ~0xAFFF FFFF is secure heap, (the start address cannot be =
specified arbitrarily, because this memory is protected by hardware, if =
the start address is 0x9000 0000, uboot will use this memory, but uboot =
can't access this memory because of hardware protection. So we find a =
section of memory that UBOOT will not use as secure heap.=20
Note: The memory of uboot can be adjusted, but avoiding the secure heap =
will limit the memory range that uboot can use, causing problems such as =
the uboot stack)
0xB000 0000 ~0xFFFFFFFF is default CMA.
So default CMA is reduced.

> >
> > > 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?
> > >
> > 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.
>=20
> I don't understand how this can happen. You should precisely know the
> maximum size required for the VPU based on your multimedia pipeline =
and
> resolutions.
>=20
We cannot estimate the maximum contiguous memory required by the VPU =
because it depends on how the video is encoded.
Thanks very much.

> I still don't understand your scenarios or the problem you are facing.


> Thanks
> Barry

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