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PCI/IOV: Add flag so platforms can skip VF scanning 

Provide a flag to skip scanning for new VFs after SR-IOV enablement.  This
can be set by implementations for which the VFs are already reported by
other means.

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sebastian Ott 2018-12-21 15:14:19 +01:00 committed by Bjorn Helgaas
parent 18f9e9d150
commit aff68a5a62
2 changed files with 7 additions and 0 deletions
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6
drivers/pci/iov.c
View File

@ -257,6 +257,9 @@ static int sriov_add_vfs(struct pci_dev *dev, u16 num_vfs)
unsigned int i; unsigned int i;
int rc; int rc;
if (dev->no_vf_scan)
return 0;
for (i = 0; i < num_vfs; i++) { for (i = 0; i < num_vfs; i++) {
rc = pci_iov_add_virtfn(dev, i); rc = pci_iov_add_virtfn(dev, i);
if (rc) if (rc)
@ -385,6 +388,9 @@ static void sriov_del_vfs(struct pci_dev *dev)
struct pci_sriov *iov = dev->sriov; struct pci_sriov *iov = dev->sriov;
int i; int i;
if (dev->no_vf_scan)
return;
for (i = 0; i < iov->num_VFs; i++) for (i = 0; i < iov->num_VFs; i++)
pci_iov_remove_virtfn(dev, i); pci_iov_remove_virtfn(dev, i);
} }

1
include/linux/pci.h
View File

@ -405,6 +405,7 @@ struct pci_dev {
unsigned int non_compliant_bars:1; /* Broken BARs; ignore them */ unsigned int non_compliant_bars:1; /* Broken BARs; ignore them */
unsigned int is_probed:1; /* Device probing in progress */ unsigned int is_probed:1; /* Device probing in progress */
unsigned int link_active_reporting:1;/* Device capable of reporting link active */ unsigned int link_active_reporting:1;/* Device capable of reporting link active */
unsigned int no_vf_scan:1; /* Don't scan for VFs after IOV enablement */
pci_dev_flags_t dev_flags; pci_dev_flags_t dev_flags;
atomic_t enable_cnt; /* pci_enable_device has been called */ atomic_t enable_cnt; /* pci_enable_device has been called */