PCI_CREATE_SLOT - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Hardware Interfaces

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NAMEpci_create_slot − create or increment refcount for physical PCI slot

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

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ARGUMENTSparent 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

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DESCRIPTIONPCI 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

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MULTIPLE SLOTSThe first slot is assigned N The second slot is assigned N−1 The third slot is assigned N−2 etc​.

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PLACEHOLDER SLOTSIn 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

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CONSIST SOLELY OF A DDDDbb 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​.

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