qemu itself is not helpful when render nodes exist, but can't be opened:
qemu-system-x86_64: egl: render node init failed
To fix this, users likely need to
* modprobe vgem (presence when physical graphic card is absent or has a driver
without
support for render nodes, such as many older cards found in server machines)
* add their user to "render" group to write to /dev/dri/renderD* (permissions)
With this change runqemu should print hints for the above as appropriate from
probing the nodes.
Signed-off-by: Alexander Kanavin <a...@linutronix.de>
---
scripts/runqemu | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/scripts/runqemu b/scripts/runqemu
index 0e105a918b1..3a170332689 100755
--- a/scripts/runqemu
+++ b/scripts/runqemu
@@ -1383,8 +1383,18 @@ to your build configuration.
render_hint = """If /dev/dri/renderD* is absent due to lack of
suitable GPU, 'modprobe vgem' will create one suitable for mesa llvmpipe
software renderer."""
try:
content = os.listdir("/dev/dri")
- if len([i for i in content if i.startswith('render')]) == 0:
- raise RunQemuError("No render nodes found in /dev/dri: %s. %s"
%(content, render_hint))
+ nodes = [i for i in content if i.startswith('renderD')]
+ if len(nodes) == 0:
+ raise RunQemuError("No render nodes found in /dev/dri/: %s.
%s" %(content, render_hint))
+ for n in nodes:
+ try:
+ with open(os.path.join("/dev/dri", n), "w") as f:
+ f.close()
+ break
+ except IOError:
+ pass
+ else:
+ raise RunQemuError("None of the render nodes in /dev/dri/ are
accessible: %s; you may need to add yourself to 'render' group or otherwise
ensure you have read-write permissions on one of them." %(nodes))
except FileNotFoundError:
raise RunQemuError("/dev/dri directory does not exist; no render
nodes available on this machine. %s" %(render_hint))
--
2.30.2
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