linux-kernel - [PATCH] um: virt-pci: implement pcibios_get_phb_of

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Date:   Fri, 20 Jan 2023 09:02:32 +0100
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>
CC:     <linux-um@...ts.infradead.org>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        <kernel@...s.com>
Subject: [PATCH] um: virt-pci: implement pcibios_get_phb_of_node()

Implement pcibios_get_phb_of_node() as x86 does in order to allow PCI
busses to be associated with devicetree nodes.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>
---
 arch/um/drivers/virt-pci.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/um/drivers/virt-pci.c b/arch/um/drivers/virt-pci.c
index 3ac220dafec4..6884e1be38e4 100644
--- a/arch/um/drivers/virt-pci.c
+++ b/arch/um/drivers/virt-pci.c
@@ -533,6 +533,25 @@ static void um_pci_irq_vq_cb(struct virtqueue *vq)
 	}
 }
 
+/* Copied from arch/x86/kernel/devicetree.c */
+struct device_node *pcibios_get_phb_of_node(struct pci_bus *bus)
+{
+	struct device_node *np;
+
+	for_each_node_by_type(np, "pci") {
+		const void *prop;
+		unsigned int bus_min;
+
+		prop = of_get_property(np, "bus-range", NULL);
+		if (!prop)
+			continue;
+		bus_min = be32_to_cpup(prop);
+		if (bus->number == bus_min)
+			return np;
+	}
+	return NULL;
+}
+
 static int um_pci_init_vqs(struct um_pci_device *dev)
 {
 	struct virtqueue *vqs[2];

---
base-commit: 1b929c02afd37871d5afb9d498426f83432e71c2
change-id: 20230120-uml-pci-of-f21d5ba4b245

Best regards,
-- 
Vincent Whitchurch <vincent.whitchurch@...s.com>