ARMSOC X11 plugin issues

[Maxime Ripard]

On Wed, Mar 23, 2016 at 10:17:05PM +0100, Maxime Ripard wrote:
> Hi David, Marico,
> 
> I've been developping a DRM/KMS driver for the Allwinner SoCs[1], with
> an additional patch to allocate GPU buffers [2]. Since those SoCs also use
> a Mali GPU, using the armsoc X11 plugin seemed like a logical choice.
> 
> I added support for the driver based on the 1.4 plugin [3], and
> started using it, which turned out pretty well, we get something
> displayed, GLES works, good.
> 
> However, after testing it for a while, the first thing we noticed was
> that some (large) buffer allocations would start to fail. Indeed, the
> plugin seems to do a lot of rather small (and for most temporary ?)
> buffer allocations, which eventually depletes the reserved memory
> pool. The allocation then fails, and the application crashes.
> 
> Then, we noticed (using xfce4, on debian jessie) that the systray
> icons were not displayed for some reason. There's also some game
> (alex4 [4]), that starts, runs, but the window content remains black
> (but it remains interactive, audio plays and if we take a screenshot,
> the content is on the image, but the screen remains black).
> 
> The weird thing about it is that when using the X generic modesetting
> plugin, everything starts to work. It seems to be allocating only one
> buffer per plane, so we never have the memory allocation
> failures. Which raises my first question: why is the armsoc plugin
> behaving differently there?
> 
> Then the graphics issues we were seeing are not there anymore, which
> seems to indicate that it's related to the plugin. I'm a bit oblivious
> to how X works exactly, and how applications interacts with it, but on
> the ioctl side, nothing really stands out. Let me know if you need any
> more tests or logs or anything.

Anyone ?

Thanks,
Maxime



-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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