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-rw-r--r--drivers/pci/iov.c47
-rw-r--r--drivers/pci/pci-sysfs.c4
-rw-r--r--drivers/pci/pci.h1
3 files changed, 50 insertions, 2 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index aeccc911abb8..f6781e42d00d 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -735,3 +735,50 @@ int pci_num_vf(struct pci_dev *dev)
return dev->sriov->nr_virtfn;
}
EXPORT_SYMBOL_GPL(pci_num_vf);
+
+/**
+ * pci_sriov_set_totalvfs -- reduce the TotalVFs available
+ * @dev: the PCI PF device
+ * numvfs: number that should be used for TotalVFs supported
+ *
+ * Should be called from PF driver's probe routine with
+ * device's mutex held.
+ *
+ * Returns 0 if PF is an SRIOV-capable device and
+ * value of numvfs valid. If not a PF with VFS, return -EINVAL;
+ * if VFs already enabled, return -EBUSY.
+ */
+int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs)
+{
+ if (!dev || !dev->is_physfn || (numvfs > dev->sriov->total))
+ return -EINVAL;
+
+ /* Shouldn't change if VFs already enabled */
+ if (dev->sriov->ctrl & PCI_SRIOV_CTRL_VFE)
+ return -EBUSY;
+ else
+ dev->sriov->drvttl = numvfs;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pci_sriov_set_totalvfs);
+
+/**
+ * pci_sriov_get_totalvfs -- get total VFs supported on this devic3
+ * @dev: the PCI PF device
+ *
+ * For a PCIe device with SRIOV support, return the PCIe
+ * SRIOV capability value of TotalVFs or the value of drvttl
+ * if the driver reduced it. Otherwise, -EINVAL.
+ */
+int pci_sriov_get_totalvfs(struct pci_dev *dev)
+{
+ if (!dev || !dev->is_physfn)
+ return -EINVAL;
+
+ if (dev->sriov->drvttl)
+ return dev->sriov->drvttl;
+ else
+ return dev->sriov->total;
+}
+EXPORT_SYMBOL_GPL(pci_sriov_get_totalvfs);
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 74508c63bd47..99b5f83d2468 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -411,7 +411,7 @@ static ssize_t sriov_totalvfs_show(struct device *dev,
{
struct pci_dev *pdev = to_pci_dev(dev);
- return sprintf(buf, "%u\n", pdev->sriov->total);
+ return sprintf(buf, "%u\n", pci_sriov_get_totalvfs(pdev));
}
@@ -452,7 +452,7 @@ static ssize_t sriov_numvfs_store(struct device *dev,
}
/* if enabling vf's ... */
- total = pdev->sriov->total;
+ total = pci_sriov_get_totalvfs(pdev);
/* Requested VFs to enable < totalvfs and none enabled already */
if ((num_vfs > 0) && (num_vfs <= total)) {
if (pdev->sriov->nr_virtfn == 0) {
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 6f6cd145bb7e..553bbba76eec 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -240,6 +240,7 @@ struct pci_sriov {
u16 stride; /* following VF stride */
u32 pgsz; /* page size for BAR alignment */
u8 link; /* Function Dependency Link */
+ u16 drvttl; /* max num VFs driver supports */
struct pci_dev *dev; /* lowest numbered PF */
struct pci_dev *self; /* this PF */
struct mutex lock; /* lock for VF bus */