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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.
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Date: Thu, 13 Jun 2024 08:49:39 +0000
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> -----Original Message-----
> From: Barry Song <baohua@kernel.org>
> Sent: Thursday, June 13, 2024 3:38 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 7:11=E2=80=AFPM Zhai He <zhai.he@nxp.com> =
wrote:
> >
> > > -----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.
> > >
> > > 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 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.
> > >
> > > 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?
> > >
> > 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?
> > >
> > 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.
> > 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.
>=20
> How is that related to your patch? I assume the default CMA is reduced =
because
> you modified it in the DTS after enabling the secure heap, as the CMA =
size is set
> by you. The default CMA size won't automatically decrease due to the =
secure
> heap. To me, 0xB0000000-0xFFFFFFFF(1.25GiB) is still too large a CMA.
>

Sorry, This example is just an example. In fact, the size of our default =
CMA is less than 1.25GiB.
Our current memory distribution is as follows. Now the size of "c" =
(default CMA) could not meet the needs of our requirement. And "b" =
(reserved memory for secure) is fixed, so we couldn't expand "c" =
(default CMA) through modify DTS. Then we reserved "a" (specific CMA) =
for VPU. However, we have confirmed with the multimedia team that the =
maximum size required is It is uncertain, so specify "a" for VPU to use =
first, and "c" for other devices that require continuous memory. If "a" =
is not enough, use "c". =20
That's the purpose of this patch.
	--------------------------------------------------
	| a. VPU specific cma             |=20
	--------------------------------------------------
	| b. reserved memory for secure    |
	---------------------------------------------------
    | c. default CMA                 |
    ---------------------------------------------------
> >
> > > >
> > > > > 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.
> > >
> > > 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.
> > >
> > We cannot estimate the maximum contiguous memory required by the VPU
> because it depends on how the video is encoded.
> > Thanks very much.
>=20
> Yes, you can. Please ask your multimedia team; they will give you a =
number.
>=20
> >
> > > I still don't understand your scenarios or the problem you are =
facing.
> >
> >
>=20
> Thanks
> Barry

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