[PATCH v8 3/8] PCI: endpoint: Add support to link a physical function to a virtual function

Kishon Vijay Abraham I
2021-08-11T06:47:56Z

While the physical function has to be linked to endpoint controller, the
virtual function has to be linked to a physical function. Add support to
link a physical function to a virtual function in pci-ep-cfs.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
drivers/pci/endpoint/pci-ep-cfs.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/drivers/pci/endpoint/pci-ep-cfs.c b/drivers/pci/endpoint/pci-ep-cfs.c
index f3a8b833b479..999911801877 100644
--- a/drivers/pci/endpoint/pci-ep-cfs.c
+++ b/drivers/pci/endpoint/pci-ep-cfs.c
@@ -475,6 +475,28 @@ static struct configfs_attribute *pci_epf_attrs[] = {
NULL,
};

+static int pci_epf_vepf_link(struct config_item *epf_pf_item,
+ struct config_item *epf_vf_item)
+{
+ struct pci_epf_group *epf_vf_group = to_pci_epf_group(epf_vf_item);
+ struct pci_epf_group *epf_pf_group = to_pci_epf_group(epf_pf_item);
+ struct pci_epf *epf_pf = epf_pf_group->epf;
+ struct pci_epf *epf_vf = epf_vf_group->epf;
+
+ return pci_epf_add_vepf(epf_pf, epf_vf);
+}
+
+static void pci_epf_vepf_unlink(struct config_item *epf_pf_item,
+ struct config_item *epf_vf_item)
+{
+ struct pci_epf_group *epf_vf_group = to_pci_epf_group(epf_vf_item);
+ struct pci_epf_group *epf_pf_group = to_pci_epf_group(epf_pf_item);
+ struct pci_epf *epf_pf = epf_pf_group->epf;
+ struct pci_epf *epf_vf = epf_vf_group->epf;
+
+ pci_epf_remove_vepf(epf_pf, epf_vf);
+}
+
static void pci_epf_release(struct config_item *item)
{
struct pci_epf_group *epf_group = to_pci_epf_group(item);
@@ -487,6 +509,8 @@ static void pci_epf_release(struct config_item *item)
}

static struct configfs_item_operations pci_epf_ops = {
+ .allow_link = pci_epf_vepf_link,
+ .drop_link = pci_epf_vepf_unlink,
.release = pci_epf_release,
};

--
2.17.1