[Intel-gfx] [PATCH] drm/i915: Deny wrapping an userptr into a framebuffer

Jani Nikula jani.nikula at linux.intel.com
Tue Oct 13 07:08:11 PDT 2015

On Tue, 13 Oct 2015, Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com> wrote:
> On 13/10/15 14:22, Chris Wilson wrote:
>> Pinning a userptr onto the hardware raises interesting questions about
>> the lifetime of such a surface as the framebuffer extends that life
>> beyond the client's address space. That is the hardware will need to
>> keep scanning out from the backing storage even after the client wants
>> to remap its address space. As the hardware pins the backing storage,
>> the userptr becomes invalid and this raises a WARN when the clients
>> tries to unmap its address space. The situation can be even more
>> complicated when the buffer is passed between processes, between a
>> client and display server, where the lifetime and hardware access is
>> even more confusing. Deny it.
> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Pushed to drm-intel-fixes, thanks for the patch and review.


> Regards,
> Tvrtko
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Jani Nikula, Intel Open Source Technology Center

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