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runqemu: check permissions of available render nodes as well as their presence

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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.

(From OE-Core rev: 12ae43abbc4e7d6184198a912487ace3a4e66e50)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
(cherry picked from commit acd85925cb197b7a31a25b60e8de762e2c3697ef)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
This commit is contained in:
Alexander Kanavin
2023-09-07 12:50:33 +02:00
committed by Steve Sakoman
parent 559ed4ecd5
commit 099fdd3441
1 changed files with 12 additions and 2 deletions
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14
scripts/runqemu
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@@ -1374,8 +1374,18 @@ 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))