I've been having this issue for awhile now and I can't seem to come up
with the solution. I'm rather inexperienced when it comes to debugging
these sort of issues, so I posted a thread on StackExchange and the Arch
forums but never got a response. I just recently made a bug report on
bugzilla, but thought I would also check here and see if anyone would be
able to help me out. Here is a link to the bug report I made:
https://bugzilla.kernel.org/show_bug.cgi?id=116101
In case it's easier, I'll also paste it below:
I am attempting to unbind my R9 290 from radeon and rebind it to vfio. However, the entire system
hangs when "echo "0000:01:00.0" >
/sys/bus/pci/devices/0000:01:00.0/driver/unbind" is ran as root.
Steps to Reproduce:
Run the following script as root
#!/bin/bash
set -x
echo "1002 67b1" > /sys/bus/pci/drivers/vfio-pci/new_id
echo "0000:01:00.0" > /sys/bus/pci/devices/0000:01:00.0/driver/unbind
echo "0000:01:00.0" > /sys/bus/pci/drivers/vfio-pci/bind
echo "1002 67b1" > /sys/bus/pci/drivers/vfio-pci/remove_id
echo "1002 aac8" > /sys/bus/pci/drivers/vfio-pci/new_id
echo "0000:01:00.1" > /sys/bus/pci/devices/0000:01:00.1/driver/unbind
echo "0000:01:00.1" > /sys/bus/pci/drivers/vfio-pci/bind
echo "1002 aac8" > /sys/bus/pci/drivers/vfio-pci/remove_id
set +x
Actual Results:
System hangs on "echo "0000:01:00.0" >
/sys/bus/pci/devices/0000:01:00.0/driver/unbind"
Journalctl shows "Apr 09 16:10:26 joey-arch-pc kernel: radeon 0000:01:00.0: Userspace still
has active objects !" followed by numerous "Apr 09 16:10:26 joey-arch-pc kernel: trying
to unbind memory from uninitialized GART !"
Expected Results:
The GPU should be unbinding from radeon and rebinding to vfio-pci without
hanging.
Additional information:
I experienced the same issue on 4.1.20-1.
I know of instances where the same script results in the expected outcome with
a Cayman PRO graphics card.
Attached is the output of journalctl for the entire boot. Go to 16:10:26 to see
relevant call traces.
Here is the journalctl output:
https://bugzilla.kernel.org/attachment.cgi?id=212291
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