pci_request_region

pci_request_region_exclusive
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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.