[Beignet] [PATCH V2 1/3] support CL_MEM_USE_HOST_PTR with userptr for cl buffer

[Zhigang Gong]

Is there any other method to test whether the system has this capability?
We need to check it when user create a context, and then set the
CL_DEVICE_HOST_UNIFIED_MEMORY
according to whether we have this capability rather than set this bit
statically.

> -----Original Message-----
> From: Beignet [mailto:beignet-bounces at lists.freedesktop.org] On Behalf Of
> Zhenyu Wang
> Sent: Friday, November 7, 2014 1:43 PM
> To: Zhigang Gong
> Cc: Guo Yejun; beignet at lists.freedesktop.org
> Subject: Re: [Beignet] [PATCH V2 1/3] support CL_MEM_USE_HOST_PTR with
> userptr for cl buffer
> 
> On 2014.11.07 11:51:08 +0800, Zhigang Gong wrote:
> > I have one major comment, what if the running system doesn't support
> userptr?
> > We may need to check whether we can use userptr feature at runtime
> > rather than compile time, right?
> 
> It's already handled by libdrm interface that if you run old kernel
without
> userptr support, you won't get bo alloc from libdrm, as in current method
just
> fallback to copy case.
> 
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