On Tue, 2021-09-07 at 10:45 +0200, Niklas Schnelle wrote:

On Tue, 2021-09-07 at 12:04 +1000, Oliver O'Halloran wrote:

quoted

On Mon, Sep 6, 2021 at 7:49 PM Niklas Schnelle [off-list ref] wrote:

quoted

Patch 3 I already sent separately resulting in the discussion below but without
a final conclusion.

https://lore.kernel.org/lkml/20210720150145.640727-1-schnelle@linux.ibm.com/ (local)

I believe even though there were some doubts about the use of
pci_dev_is_added() by arch code the existing uses as well as the use in the
final patch of this series warrant this export.

The use of pci_dev_is_added() in arch/powerpc was because in the past
pci_bus_add_device() could be called before pci_device_add(). That was
fixed a while ago so It should be safe to remove those calls now.

Hmm, ok that confirms Bjorns suspicion and explains how it came to be.
I can certainly sent a patch for that. This would then leave only the
existing use in s390 which I added because of a dead lock prevention
and explained here:
https://lore.kernel.org/lkml/87d15d5eead35c9eaa667958d057cf4a81a8bf13.camel@linux.ibm.com/ (local)

Plus the need to use it in the recovery code of this series. I think in
the EEH code the need for a similar check is alleviated by the checks
in the beginning of
arch/powerpc/kernel/eeh_driver.c:eeh_handle_normal_event() especially
eeh_slot_presence_check() which checks presence via the hotplug slot.
I guess we could use our own state tracking in a similar way but felt
like pci_dev_is_added() is the more logical choice.

Looking into this again, I think we actually can't easily track this
state ourselves outside struct pci_dev. The reason for this is that
when e.g. arch/s390/pci/pci_sysfs.c:recover_store() removes the struct
pci_dev and scans it again the new struct pci_dev re-uses the same
struct zpci_dev because from a platform point of view the PCI device
was never removed but only disabled and re-enabled. Thus we can only
distinguish the stale struct pci_dev by looking at things stored in
struct pci_dev itself.

That said, I think for the recovery case we might be able to drop the
pci_dev_is_added() and rely on pdev->driver != NULL which we check
anyway and that should catch any PCI device that was already removed.