Understood. I saw weston client apps were failing to create render buffers from kmsro driver and found it was because they were not allowed to create and destroy dumb objects then I came up with this patch. I just thought it's the simplest solution. I didn't know it violates the rule. I think I should look into kmsro to make the client app to get the render buffer from ro-device instead. Thanks
On Fri, Jun 11, 2021 at 11:39:46AM +0100, Emil Velikov wrote:
On Fri, 11 Jun 2021 at 10:47, Daniel Vetter daniel@ffwll.ch wrote:
On Thu, Jun 10, 2021 at 02:36:59PM -0700, Dongwon Kim wrote:
Render clients should be able to create/destroy dumb object to import and use it as render buffer in case the default DRM device is different from the render device (i.e. kmsro).
Signed-off-by: Dongwon Kim dongwon.kim@intel.com
Uh no.
Well I know everyone just hacks around this, but the idea behind dumb buffer objects is that they're for kms scanout only. Furthermore on many drivers they allocate a limited resource like CMA memory. Handing that out like candy isn't a great idea.
And it's exactly those drivers that kmsro currently is used for where the display driver needs special memory.
Couldn't agree more. Perhaps we should add an inline comment and/or reference to a thread why?
-Emil