On 08/31/2018 04:49 PM, Michel Dänzer wrote:
On 2018-08-31 4:46 p.m., Thomas Hellstrom wrote:
On 08/31/2018 04:38 PM, Michel Dänzer wrote:
[ Adding the amd-gfx list ]
On 2018-08-31 3:05 p.m., Thomas Hellstrom wrote:
On 08/31/2018 02:30 PM, Emil Velikov wrote:
On 31 August 2018 at 12:54, Thomas Hellstrom <thellstrom@xxxxxxxxxx>
wrote:
To determine whether a device node is a drm device node or not, the
code
currently compares the node's major number to the static drm major
device
number.
This breaks the standalone vmwgfx driver on XWayland dri clients,
Any particular reason why the code doesn't use a fixed node there?
It will make the diff vs the in-kernel driver a bit smaller.
Because then it won't be able to interoperate with other in-tree
drivers, like virtual drm drivers or passthrough usb drm drivers.
There is no clean way to share the minor number allocation with in-tree
drm, so standalone vmwgfx is using dynamic major allocation.
I wonder why I haven't heard of any of these issues with the standalone
version of amdgpu shipped in packaged AMD releases. Does that also use a
different major number? If yes, maybe it's just that nobody has tried
Xwayland clients with that driver. If no, how does it avoid the other
issues described above?
Is standalone AMD supposed to be able to coexist with in-tree drm drivers?
Yes, it does, it's working e.g. on laptops with an Intel integrated and
an AMD discrete GPU.
Hmm. The symptoms with xf86-video-vmware are that when mesa initializes,
we get:
MESA-LOADER: failed to retrieve device information
MESA-LOADER: failed to retrieve device information
MESA-LOADER: failed to retrieve device information
but then vmwgfx_dri.so loads anyway.
With XWayland, mesa just silently tries swrast instead of vmwgfx.
Not sure this has always been the case though. It might be due to a
recent XWayland change. In any case, the change to libdrm silence the
warnings on Xorg and makes mesa try vmwgfx on XWayland.
/Thomas
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