How to check number of first slot on the MO or TAPE device?

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pci_create_slot

PCI_CREATE_SLOT(9)						Hardware Interfaces						PCI_CREATE_SLOT(9)

NAME

       pci_create_slot - create or increment refcount for physical PCI slot

SYNOPSIS

       struct pci_slot * pci_create_slot(struct pci_bus * parent, int slot_nr, const char * name, struct hotplug_slot * hotplug);

ARGUMENTS

       parent
	   struct pci_bus of parent bridge

       slot_nr
	   PCI_SLOT(pci_dev->devfn) or -1 for placeholder

       name
	   user visible string presented in /sys/bus/pci/slots/<name>

       hotplug
	   set if caller is hotplug driver, NULL otherwise

DESCRIPTION

       PCI slots have first class attributes such as address, speed, width, and a struct pci_slot is used to manage them. This interface will
       either return a new struct pci_slot to the caller, or if the pci_slot already exists, its refcount will be incremented.

       Slots are uniquely identified by a pci_bus, slot_nr tuple.

       There are known platforms with broken firmware that assign the same name to multiple slots. Workaround these broken platforms by renaming
       the slots on behalf of the caller. If firmware assigns name N to

MULTIPLE SLOTS

       The first slot is assigned N The second slot is assigned N-1 The third slot is assigned N-2 etc.

PLACEHOLDER SLOTS

       In most cases, pci_bus, slot_nr will be sufficient to uniquely identify a slot. There is one notable exception - pSeries (rpaphp), where
       the slot_nr cannot be determined until a device is actually inserted into the slot. In this scenario, the caller may pass -1 for slot_nr.

       The following semantics are imposed when the caller passes slot_nr == -1. First, we no longer check for an existing struct pci_slot, as
       there may be many slots with slot_nr of -1. The other change in semantics is user-visible, which is the 'address' parameter presented in
       sysfs will

CONSIST SOLELY OF A DDDD

       bb tuple, where dddd is the PCI domain of the struct pci_bus and bb is the bus number. In other words, the devfn of the 'placeholder' slot
       will not be displayed.

COPYRIGHT

Kernel Hackers Manual 2.6.					     July 2010							PCI_CREATE_SLOT(9)

Programming