[PATCH v2 3/4] drm/exynos: added userptr feature.

[daeinki at gmail.com]

Hi Dave,

2012. 4. 25. 오후 7:15 Dave Airlie <airlied at gmail.com> 작성:

> On Tue, Apr 24, 2012 at 6:17 AM, Inki Dae <inki.dae at samsung.com> wrote:
>> this feature could be used to use memory region allocated by malloc() in user
>> mode and mmaped memory region allocated by other memory allocators. userptr
>> interface can identify memory type through vm_flags value and would get
>> pages or page frame numbers to user space appropriately.
> 
> Is there anything to stop the unpriviledged userspace driver locking
> all the RAM in the machine inside userptr?
> 

you mean that there is something that it can stop user space driver locking some memory region  of RAM? and if any user space driver locked some region then anyone on user space can't access the region? could you please tell me about your concerns in more detail so that we can solve the issue? I guess you mean that any user level driver such as specific EGL library can allocate some memory region and also lock the region so that other user space applications can't access the region until rendering is completed by hw accelerator such as 2d/3d core or opposite case.

actually, this feature has already been used by v4l2 so I didn't try to consider we could face with any problem with this and I've got a feeling maybe there is something I missed so I'd be happy for you or anyone give me any advices.

Thanks,
Inki Dae.


> seems like a very bad plan, I know TTM has code to address this sort
> of things with limits.
> 
> Dave.
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