1PCI_CREATE_SLOT(9)            Hardware Interfaces           PCI_CREATE_SLOT(9)
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NAME

6       pci_create_slot - create or increment refcount for physical PCI slot
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SYNOPSIS

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

14       parent
15           struct pci_bus of parent bridge
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17       slot_nr
18           PCI_SLOT(pci_dev->devfn) or -1 for placeholder
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20       name
21           user visible string presented in /sys/bus/pci/slots/<name>
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23       hotplug
24           set if caller is hotplug driver, NULL otherwise
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DESCRIPTION

27       PCI slots have first class attributes such as address, speed, width,
28       and a struct pci_slot is used to manage them. This interface will
29       either return a new struct pci_slot to the caller, or if the pci_slot
30       already exists, its refcount will be incremented.
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32       Slots are uniquely identified by a pci_bus, slot_nr tuple.
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34       There are known platforms with broken firmware that assign the same
35       name to multiple slots. Workaround these broken platforms by renaming
36       the slots on behalf of the caller. If firmware assigns name N to
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MULTIPLE SLOTS

39       The first slot is assigned N The second slot is assigned N-1 The third
40       slot is assigned N-2 etc.
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PLACEHOLDER SLOTS

43       In most cases, pci_bus, slot_nr will be sufficient to uniquely identify
44       a slot. There is one notable exception - pSeries (rpaphp), where the
45       slot_nr cannot be determined until a device is actually inserted into
46       the slot. In this scenario, the caller may pass -1 for slot_nr.
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48       The following semantics are imposed when the caller passes slot_nr ==
49       -1. First, we no longer check for an existing struct pci_slot, as there
50       may be many slots with slot_nr of -1. The other change in semantics is
51       user-visible, which is the 'address' parameter presented in sysfs will
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CONSIST SOLELY OF A DDDD

54       bb tuple, where dddd is the PCI domain of the struct pci_bus and bb is
55       the bus number. In other words, the devfn of the 'placeholder' slot
56       will not be displayed.
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59Kernel Hackers Manual 3.10         June 2019                PCI_CREATE_SLOT(9)
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