[v17,06/15] PCI: endpoint: Set ID and of_node for function driver

Commit Message

Frank Li April 7, 2025, 7:50 p.m. UTC

Set device ID as 'vfunc_no << 3 | func_no' and use
'device_set_of_node_from_dev()' to set 'of_node' the same as the EPC parent
device.

Currently, EPF 'of_node' is NULL, but many functions depend on 'of_node'
settings, such as DMA, IOMMU, and MSI. At present, all DMA allocation
functions use the EPC's device node, but they should use the EPF one.
For multiple function drivers, IOMMU/MSI should be different for each
function driver.

If multiple function devices share the same EPC device, there will be
no isolation between them. Setting the ID and 'of_node' prepares for
proper support.

Signed-off-by: Frank Li <[e-mail]>
---
change from v14 to v16
- none

change from v13 to v14
new patch
---
 drivers/pci/endpoint/pci-epf-core.c | 4 ++++
 include/linux/pci-epf.h             | 2 ++
 2 files changed, 6 insertions(+)

Patch

diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
index 394395c7f8dec..d04224b8e1631 100644
--- a/drivers/pci/endpoint/pci-epf-core.c
+++ b/drivers/pci/endpoint/pci-epf-core.c
@@ -120,12 +120,16 @@  int pci_epf_bind(struct pci_epf *epf)
 		epf_vf->sec_epc_func_no = epf->sec_epc_func_no;
 		epf_vf->epc = epf->epc;
 		epf_vf->sec_epc = epf->sec_epc;
+		epf_vf->dev.id = PCI_EPF_DEVID(epf->func_no, vfunc_no);
+		device_set_of_node_from_dev(&epf_vf->dev, epc->dev.parent);
 		ret = epf_vf->driver->ops->bind(epf_vf);
 		if (ret)
 			goto ret;
 		epf_vf->is_bound = true;
 	}
 
+	epf->dev.id = PCI_EPF_DEVID(epf->func_no, 0);
+	device_set_of_node_from_dev(&epf->dev, epc->dev.parent);
 	ret = epf->driver->ops->bind(epf);
 	if (ret)
 		goto ret;
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index 879d19cebd4fc..1040d83740f9a 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -213,6 +213,8 @@  static inline void *epf_get_drvdata(struct pci_epf *epf)
 	return dev_get_drvdata(&epf->dev);
 }
 
+#define PCI_EPF_DEVID(func_no, vfunc_no) ((vfunc_no) << 3 | (func_no))
+
 struct pci_epf *pci_epf_create(const char *name);
 void pci_epf_destroy(struct pci_epf *epf);
 int __pci_epf_register_driver(struct pci_epf_driver *driver,