linux-kernel - [PATCH v14 05/15] PCI: endpoint: Set ID and of

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Message-Id: <20250207-ep-msi-v14-5-9671b136f2b8@nxp.com>
Date: Fri, 07 Feb 2025 14:39:47 -0500
From: Frank Li <Frank.Li@....com>
To: Kishon Vijay Abraham I <kishon@...nel.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Thomas Gleixner <tglx@...utronix.de>, Anup Patel <apatel@...tanamicro.com>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Marc Zyngier <maz@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>, 
 Shuah Khan <shuah@...nel.org>, Richard Zhu <hongxing.zhu@....com>, 
 Lucas Stach <l.stach@...gutronix.de>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, Rob Herring <robh@...nel.org>, 
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Niklas Cassel <cassel@...nel.org>, dlemoal@...nel.org, jdmason@...zu.us, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-pci@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 imx@...ts.linux.dev, devicetree@...r.kernel.org, 
 Frank Li <Frank.Li@....com>
Subject: [PATCH v14 05/15] PCI: endpoint: Set ID and of_node for function
 driver

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 <Frank.Li@....com>
---
 drivers/pci/endpoint/pci-epf-core.c | 4 ++++
 include/linux/pci-epf.h             | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
index 50bc2892a36c5..f728ee2660a4e 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 ee6156bcbbd05..d2790b8b29394 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -212,6 +212,8 @@ 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,

-- 
2.34.1