[Bug 66990] [sna ivb] corruption with chromium

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66990

--- Comment #25 from Chris Wilson <chris at chris-wilson.co.uk> ---
If you are keen, you can try:

the userptr branch from http://cgit.freedesktop.org/~ickle/linux-2.6

and compiling the ddx with ./configure --enable-userptr <usual configure
options>

The difference will be subtle, only a path where we need to operate on a busy
target will use the userptr directly. At the moment, we will allocate a staging
buffer to perform the copy. My feeling is that we are missing some barrier
around that staging buffer and the GPU reads garbage instead of the updated
content from chromium. So if switching to userptr does fix the corruption, I
think that points towards the staging buffer.

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