linux-kernel - Re: [PATCHv2 1/1] [tools]: android/ion: userspace test utility for ion buffer sharing

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Date:   Wed, 4 Oct 2017 09:20:30 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Pintu Agarwal <pintu.ping@...il.com>
Cc:     linux-kernel@...r.kernel.org, labbott@...hat.com,
        pintu_agarwal@...oo.com
Subject: Re: [PATCHv2 1/1] [tools]: android/ion: userspace test utility for
 ion buffer sharing

On Tue, Oct 03, 2017 at 12:48:59PM -0400, 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/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/tools/android/ion$ sudo ./ionapp_import.out
> Received buffer fd: 4
> Read buffer content:
> 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd
> 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0
> 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0
> 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....

Can you tie this into the kselftest framework, to make automated tests
of this kernel feature easier?

thanks,

greg k-h