pci_request_region_exclusive(9) - phpMan
PCI_REQUEST_REGION_E(9) Hardware Interfaces 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.
COPYRIGHT
Kernel Hackers Manual 4.8. January 2017 PCI_REQUEST_REGION_E(9)
|