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Subject[pci PATCH v7 1/5] pci: Add pci_sriov_configure_simple for PFs that don't manage VF resources
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From: Alexander Duyck <alexander.h.duyck@intel.com>

This patch adds a common configuration function called
pci_sriov_configure_simple that will allow for managing VFs on devices
where the PF is not capable of managing VF resources.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
---

v5: New patch replacing pci_sriov_configure_unmanaged with
pci_sriov_configure_simple
Dropped bits related to autoprobe changes
v6: Defined pci_sriov_configure_simple as NULL if IOV is disabled
v7: Updated pci_sriov_configure_simple to drop need for err value
Fixed comment explaining why pci_sriov_configure_simple is NULL

drivers/pci/iov.c | 31 +++++++++++++++++++++++++++++++
include/linux/pci.h | 3 +++
2 files changed, 34 insertions(+)

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 677924ae0350..3e0a7fdff3e9 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -807,3 +807,34 @@ 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 unmanaged SR-IOV
+ * @dev: the PCI device
+ * @nr_virtfn: number of virtual functions to enable, 0 to disable
+ *
+ * Used to provide generic enable/disable SR-IOV option for devices
+ * that do not manage the VFs generated by their driver. 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)
+{
+ 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) {
+ sriov_disable(dev);
+ return 0;
+ }
+
+ return sriov_enable(dev, nr_virtfn) ? : nr_virtfn;
+}
+EXPORT_SYMBOL_GPL(pci_sriov_configure_simple);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 024a1beda008..992202449829 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1953,6 +1953,7 @@ static inline void pci_mmcfg_late_init(void) { }
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);
#else
@@ -1980,6 +1981,8 @@ 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; }
+/* this is expected to be used as a function pointer, just define as NULL */
+#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) { }
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