Solved pci_release_msi fails power management (S3)

[JasonZ]

I use the following call sequence to request MSI-X interrupt resource when loading device driver, and it's working:

• bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE)
• pci_msix_count
• pci_alloc_msix
• bus_alloc_resource(dev, SYS_RES_IRQ, &rid, RF_SHAREABLE | RF_ACTIVE)
• bus_setup_intr

Then I use the following call sequence to free MSI-X interrupt resource when unloading device driver, and it's also working:

• bus_teardown_intr
• bus_release_resource(dev, SYS_RES_IRQ, rid, irqRes);
• pci_release_msi
• bus_release_resource(dev, SYS_RES_MEMORY, PCIR_BAR(0), barRes[0])

However, I encountered problems when testing power management (S3).
I use the following call sequence to free MSI-X interrupt resource when suspending to RAM:

• bus_teardown_intr
• bus_release_resource(dev, SYS_RES_IRQ, rid, irqRes);
• pci_release_msi

I observed "sudo acpiconf -s 3" is NOT able to suspend system to RAM.
I also observed: if NOT calling pci_release_msi, then "sudo acpiconf -s 3" is able to suspend system to RAM.
Can advice what is the cause of the problem?
Thanks in advance.

 

[yuripv79]

As with previous questions, check what existing drivers do.

Having looked at several, I don't see any special handling required for suspend -- what happens if you don't do anything as well?

 

[JasonZ]

As with previous questions, check what existing drivers do.

Having looked at several, I don't see any special handling required for suspend -- what happens if you don't do anything as well?

Thanks yuripv79.
You are correct.
I tried: "when suspending, NOT freeing IRQ; then when resuming, NOT requesting IRQ"
It's working.
Thanks a lot.