PCI_REQUEST_REGION_E(9)

NAME
pci_request_region_exclusive - Reserved PCI I/O and memory resource

SYNOPSIS

int pci_request_region_exclusive(struct pci_dev * pdev, int bar, const char * res_name);

ARGUMENTS

pdev
    PCI device whose resources are to be reserved

bar
    BAR to be reserved

res_name
    Name to be associated with resource.

DESCRIPTION

Mark the PCI region associated with PCI device pdev BR bar as being reserved by owner res_name. Do not access any address inside the PCI regions unless this call returns successfully.

Returns 0 on success, or EBUSY on error. A warning message is also printed on failure.

The key difference that _exclusive makes it that userspace is explicitly not allowed to map the resource via /dev/mem or sysfs.

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