diff options
| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2018-04-21 15:23:09 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2018-04-24 16:46:56 -0500 |
| commit | 8effc395c2097e258fcedfc02ed4a66d45fb4238 (patch) | |
| tree | c0b573e7630e44c68c2bbe9f816135bf52363459 /include/linux/pci.h | |
| parent | 60cc43fc888428bb2f18f08997432d426a243338 (diff) | |
| download | lwn-8effc395c2097e258fcedfc02ed4a66d45fb4238.tar.gz lwn-8effc395c2097e258fcedfc02ed4a66d45fb4238.zip | |
PCI/IOV: Add pci_sriov_configure_simple()
SR-IOV (Single Root I/O Virtualization) is an optional PCIe capability (see
PCIe r4.0, sec 9). A PCIe Function with the SR-IOV capability is referred
to as a PF (Physical Function). If SR-IOV is enabled on the PF, several
VFs (Virtual Functions) may be created. The VFs can be individually
assigned to virtual machines, which allows them to share a single hardware
device while being isolated from each other.
Some SR-IOV devices have resources such as queues and interrupts that must
be set up in the PF before enabling the VFs, so they require a PF driver to
do that.
Other SR-IOV devices don't require any PF setup before enabling VFs. Add a
pci_sriov_configure_simple() interface so PF drivers for such devices can
use it without repeating the VF-enabling code.
Tested-by: Mark Rustad <mark.d.rustad@intel.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
[bhelgaas: changelog, comment]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Greg Rose <gvrose8192@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>:wq
Diffstat (limited to 'include/linux/pci.h')
| -rw-r--r-- | include/linux/pci.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 73178a2fcee0..911f9098a466 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1954,6 +1954,7 @@ int pci_num_vf(struct pci_dev *dev); int pci_vfs_assigned(struct pci_dev *dev); int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs); int pci_sriov_get_totalvfs(struct pci_dev *dev); +int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn); resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno); void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe); @@ -1986,6 +1987,7 @@ static inline int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs) { return 0; } static inline int pci_sriov_get_totalvfs(struct pci_dev *dev) { return 0; } +#define pci_sriov_configure_simple NULL static inline resource_size_t pci_iov_resource_size(struct pci_dev *dev, int resno) { return 0; } static inline void pci_vf_drivers_autoprobe(struct pci_dev *dev, bool probe) { } |