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From: Ganapatrao Kulkarni <gkulkarni@caviumnetworks.com>
Newsgroups: linux.kernel
Subject: [PATCH] arm64, pci, numa: Adding helper functions as required by pci
Date: Tue, 22 Dec 2015 12:00:02 +0100
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Adding helper functions and necessary code to make
pci driver(pci-host-generic) numa aware.

This patch is on top of arm64-numa v7.
http://www.spinics.net/lists/arm-kernel/msg460813.html

Signed-off-by: Ganapatrao Kulkarni <gkulkarni@caviumnetworks.com>
---
 arch/arm64/include/asm/numa.h       | 8 +++++---
 arch/arm64/kernel/pci.c             | 8 ++++++++
 drivers/pci/host/pci-host-generic.c | 1 +
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/include/asm/numa.h b/arch/arm64/include/asm/numa.h
index b8c2a3f..1eca4db 100644
--- a/arch/arm64/include/asm/numa.h
+++ b/arch/arm64/include/asm/numa.h
@@ -15,9 +15,11 @@
 extern int __node_distance(int from, int to);
 #define node_distance(a, b) __node_distance(a, b)
 
-/* dummy definitions for pci functions */
-#define pcibus_to_node(node)	0
-#define cpumask_of_pcibus(bus)	0
+struct pci_bus;
+extern int pcibus_to_node(struct pci_bus *bus);
+#define cpumask_of_pcibus(bus)	(pcibus_to_node(bus) == -1 ?		\
+				 cpu_all_mask :				\
+				 cpumask_of_node(pcibus_to_node(bus)))
 
 extern int cpu_to_node_map[NR_CPUS];
 extern nodemask_t numa_nodes_parsed __initdata;
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index b3d098b..37e2e9f 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -84,3 +84,11 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 	return NULL;
 }
 #endif
+
+#ifdef CONFIG_NUMA
+int pcibus_to_node(struct pci_bus *bus)
+{
+	return dev_to_node(&bus->dev);
+}
+EXPORT_SYMBOL(pcibus_to_node);
+#endif
diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
index 5434c90..a821e49 100644
--- a/drivers/pci/host/pci-host-generic.c
+++ b/drivers/pci/host/pci-host-generic.c
@@ -230,6 +230,7 @@ static int gen_pci_probe(struct platform_device *pdev)
 	of_pci_check_probe_only();
 
 	of_id = of_match_node(gen_pci_of_match, np);
+	set_dev_node(dev, of_node_to_nid(np));
 	pci->cfg.ops = (struct gen_pci_cfg_bus_ops *)of_id->data;
 	pci->host.dev.parent = dev;
 	INIT_LIST_HEAD(&pci->host.windows);
-- 
1.8.1.4
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