linux-kernel - Re: [PATCH 1/1] [tools]: android/ion: userspace test utility for ion buffer sharing

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Message-ID: <CAOuPNLjaS2rpbkb73WyTqzABztRcOZcuNpdO0BN=29fugS=pNQ@mail.gmail.com>
Date:   Sat, 30 Sep 2017 09:34:12 +0530
From:   Pintu Kumar <pintu.ping@...il.com>
To:     Laura Abbott <labbott@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Pintu Kumar <pintu.ping@...il.com>
Cc:     linux-kernel@...r.kernel.org, Pintu Kumar <pintu_agarwal@...oo.com>
Subject: Re: [PATCH 1/1] [tools]: android/ion: userspace test utility for ion
 buffer sharing

On Thu, Sep 28, 2017 at 11:46 PM, Pintu Kumar <pintu.ping@...il.com> wrote:
> On Thu, Sep 28, 2017 at 11:41 PM, Pintu Kumar <pintu.ping@...il.com> wrote:
>> On Wed, Sep 27, 2017 at 7:54 PM, Pintu Kumar <pintu.ping@...il.com> wrote:
>>> On Wed, Sep 27, 2017 at 12:52 AM, Laura Abbott <labbott@...hat.com> wrote:
>>>> On 09/26/2017 11:08 AM, Pintu Agarwal wrote:
>>>>>
>>>>> This is a test utility to verify ION buffer sharing in user space
>>>>> between 2 independent processes.
>>>>> It uses unix domain socket as IPC to transfer an FD to another process
>>>>> and install it.
>>>>>
>>>>> This utility demonstrates how ION buffer sharing can be implemented
>>>>> between
>>>>> two user space processes, using various heap ids.
>>>>>
>>>>> This utility is verified on Ubuntu 32-bit machine using 2 independent
>>>>> process such as: ionapp_export (server) and ionapp_import (client).
>>>>> First the server needs to be run to export FD to the client.
>>>>> This utility works only if /dev/ion interface is present.
>>>>>
>>>>> Here is a sample demo example:
>>>>>
>>>>> linux-stable/tools/android/ion$ sudo ./ionapp_export.out -i 1 -s 10
>>>>> heap_type: 2, heap_size: 10
>>>>> Fill buffer content:
>>>>> 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd
>>>>> Sharing fd: 6, Client fd: 5
>>>>> <ion_close_buffer_fd>: buffer release successfully....
>>>>>
>>>>> linux-stable/tools/android/ion$ sudo ./ionapp_import.out
>>>>> Received buffer fd: 4
>>>>> Read buffer content:
>>>>> 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd
>>>>> Fill buffer content:
>>>>> 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd
>>>>> 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd
>>>>> 0xfd 0xfd 0xfd 0xfd
>>>>> <ion_close_buffer_fd>: buffer release successfully....
>>>>>
>>>>> Signed-off-by: Pintu Agarwal<pintu.ping@...il.com>
>>>>
>>>>
>>>> This is a good start on a test app for Ion but it needs to be
>>>> updated to use the new ABI.
>>>
>>> Thanks Laura for your feedback.
>>> Can you point out what changes are required?
>>>
>> Ok I got it what you mean.
>> In the latest mainline kernel I observed that there are several
>> changes to uapi/ion.h header file.
>> Like this one:
>> staging: android: ion: Break the ABI in the name of forward progress
>>
>> I can quickly make those changes.
>> In fact I actually started with linux-next tree itself.
>> But there is one problem that I am facing using linux-next or latest
>> mainline kernel.
>> Right now, I am running Ubuntu on Oracle virtual box 5.1 (I don't have
>> the real Ubuntu PC as of now).
>> This virtual box supports only 4.10 LTS kernel version.
>> If I try to build and flash for higher kernel version, the system does
>> not boot and goes to kernel panic during boot (even without my
>> changes).
>> So, I ended up using the same LTS kernel version.
>>
>> Now I need to figure out how to use the linux-next tree.
>> If you have any suggestions please let me know.
>>
> Ok, one option is, I can pull all those recent patches and apply on my
> LTS branch then verify it and submit on latest release.
> But, is there any other option to verify linux-next tree?
>

Hello Laura,
Right now I am facing problem in using linux-next tree.
Once I resolve that problem, I will resubmit this patch on the
linux-next itself.

Thank you!

>>
>> Thanks,
>> Pintu
>>
>>>>
>>>> Thanks,
>>>> Laura