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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