PCI_REQUEST_REGION_E(9) Hardware Interfaces PCI_REQUEST_REGION_E(9)NAMEpci_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.
COPYRIGHTKernel Hackers Manual 2.6. November 2013 PCI_REQUEST_REGION_E(9)