linux-kernel - Re: [PATCH v3] staging: android: ion: Add implementation of dma_buf_vmap and dma_buf

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Message-ID: <bf909d75-21a4-9d6d-2f72-887492821252@redhat.com>
Date:   Tue, 6 Feb 2018 15:56:28 -0800
From:   Laura Abbott <labbott@...hat.com>
To:     Alexey Skidanov <alexey.skidanov@...el.com>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     devel@...verdev.osuosl.org, tkjos@...roid.com, rve@...roid.com,
        linux-kernel@...r.kernel.org, maco@...roid.com,
        sumit.semwal@...aro.org
Subject: Re: [PATCH v3] staging: android: ion: Add implementation of
 dma_buf_vmap and dma_buf_vunmap

On 01/31/2018 10:10 PM, Alexey Skidanov wrote:
> 
> On 01/31/2018 03:00 PM, Greg KH wrote:
>> On Wed, Jan 31, 2018 at 02:03:42PM +0200, Alexey Skidanov wrote:
>>> Any driver may access shared buffers, created by ion, using dma_buf_vmap and
>>> dma_buf_vunmap dma-buf API that maps/unmaps previosuly allocated buffers into
>>> the kernel virtual address space. The implementation of these API is missing in
>>> the current ion implementation.
>>>
>>> Signed-off-by: Alexey Skidanov <alexey.skidanov@...el.com>
>>> ---
>>
>> No review from any other Intel developers? :(
> Will add.
>>
>> Anyway, what in-tree driver needs access to these functions?
> I'm not sure that there are the in-tree drivers using these functions and ion as> buffer exporter because they are not implemented in ion :) But there are some in-tre> drivers using these APIs (gpu drivers) with other buffer exporters.

It's still not clear why you need to implement these APIs.
Are you planning to use Ion with GPU drivers? I'm especially
interested in this if you have a non-Android use case.

Thanks,
Laura