mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 18:26:43 +07:00
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
This commit is contained in:
parent
60cc43fc88
commit
8effc395c2
@ -833,3 +833,39 @@ int pci_sriov_get_totalvfs(struct pci_dev *dev)
|
||||
return dev->sriov->total_VFs;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs);
|
||||
|
||||
/**
|
||||
* pci_sriov_configure_simple - helper to configure SR-IOV
|
||||
* @dev: the PCI device
|
||||
* @nr_virtfn: number of virtual functions to enable, 0 to disable
|
||||
*
|
||||
* Enable or disable SR-IOV for devices that don't require any PF setup
|
||||
* before enabling SR-IOV. Return value is negative on error, or number of
|
||||
* VFs allocated on success.
|
||||
*/
|
||||
int pci_sriov_configure_simple(struct pci_dev *dev, int nr_virtfn)
|
||||
{
|
||||
int rc;
|
||||
|
||||
might_sleep();
|
||||
|
||||
if (!dev->is_physfn)
|
||||
return -ENODEV;
|
||||
|
||||
if (pci_vfs_assigned(dev)) {
|
||||
pci_warn(dev, "Cannot modify SR-IOV while VFs are assigned\n");
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
if (nr_virtfn == 0) {
|
||||
sriov_disable(dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
rc = sriov_enable(dev, nr_virtfn);
|
||||
if (rc < 0)
|
||||
return rc;
|
||||
|
||||
return nr_virtfn;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pci_sriov_configure_simple);
|
||||
|
@ -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) { }
|
||||
|
Loading…
Reference in New Issue
Block a user