linux-kernel - Re: [RFC LINUX PATCH 0/3] Allow remote to specify shared memory

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Message-ID: <CAA07jV-Neu5r2-CFFsnuN9pT_g9kV=zSSbzhbxCFODHe4v9b=g@mail.gmail.com>
Date:   Tue, 28 Mar 2017 11:52:53 -0700
From:   Wendy Liang <sunnyliangjy@...il.com>
To:     Suman Anna <s-anna@...com>
Cc:     Wendy Liang <wendy.liang@...inx.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wendy Liang <jliang@...inx.com>
Subject: Re: [RFC LINUX PATCH 0/3] Allow remote to specify shared memory

Thanks Suman for your comments.


On Mon, Mar 27, 2017 at 8:54 AM, Suman Anna <s-anna@...com> wrote:
> Hi Wendy,
>
> On 03/24/2017 02:22 PM, Wendy Liang wrote:
>> This patch enables the remoteproc to specify the shared memory.
>> Remoteproc declared this memory as DMA memory.
>> It can be used for virtio, or shared buffers.
>
> You should be able to achieve this without any remoteproc core changes.
> You can do this by defining a reserved-memory node in your DTS file (can
> be a CMA pool or a DMA pool), assigning the node using memory-region in
> your remoteproc DT node and using the function,
> of_reserved_mem_device_init() in your remoteproc driver.

The idea to introduce the rproc_mem is to let the remote to specify
the shared memory.
I am trying to see if there is a way to specify this software attribute without
touching the device tree as it doesn't look like it is hardware related.
And try to see if there is a way that when I change the firmware, i
don't need to change the device tree.

Thanks,
Wendy

>
> regards
> Suman
>
>>
>> Wendy Liang (3):
>>   remoteproc: add rproc mem resource entry
>>   remoteproc: add rproc_mem resource entry handler
>>   remoteproc: Release DMA declare mem when cleanup rsc
>>
>>  drivers/remoteproc/remoteproc_core.c | 40 ++++++++++++++++++++++++++++++++++++
>>  include/linux/remoteproc.h           | 23 ++++++++++++++++++++-
>>  2 files changed, 62 insertions(+), 1 deletion(-)
>>
>
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