linux-toradex.git/arch/um/include/linux/virtio-uml.h, branch v6.7 Linux kernel for Apalis and Colibri modules um: virtio/pci: enable suspend/resume 2021-06-17T19:45:44+00:00 Johannes Berg johannes.berg@intel.com 2021-03-05T12:19:59+00:00 43c590cb86665be702c0af0231a10ec813df9cfd The UM virtual PCI devices currently cannot be suspended properly since the virtio driver already disables VQs well before the PCI bus's suspend_noirq wants to complete the transition by writing to PCI config space. After trying around for a long time with moving the devices on the DPM list, trying to create dependencies between them, etc. I gave up and instead added UML specific cross-driver API that lets the virt-pci code enable not suspending/resuming VQs for its devices. This then allows the PCI bus suspend_noirq to still talk to the device, and suspend/resume works properly. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Richard Weinberger <richard@nod.at> 
The UM virtual PCI devices currently cannot be suspended properly
since the virtio driver already disables VQs well before the PCI
bus's suspend_noirq wants to complete the transition by writing to
PCI config space.

After trying around for a long time with moving the devices on the
DPM list, trying to create dependencies between them, etc. I gave
up and instead added UML specific cross-driver API that lets the
virt-pci code enable not suspending/resuming VQs for its devices.

This then allows the PCI bus suspend_noirq to still talk to the
device, and suspend/resume works properly.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>