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authorCatalin Marinas <catalin.marinas@arm.com>2014-09-29 18:29:26 +0400
committerBjorn Helgaas <bhelgaas@google.com>2014-10-01 03:08:57 +0400
commit670ba0c8883b576d0aec28bd7a838358a4be1406 (patch)
treefd0b13325b9c832f5d56a969d154d5d4a235b6c2 /include/linux/pci.h
parent0b0b0893d49b34201a6c4416b1a707b580b91e3d (diff)
downloadlinux-670ba0c8883b576d0aec28bd7a838358a4be1406.tar.xz
PCI: Add generic domain handling
The handling of PCI domains (or PCI segments in ACPI speak) is usually a straightforward affair but its implementation is currently left to the architectural code, with pci_domain_nr(b) querying the value of the domain associated with bus b. This patch introduces CONFIG_PCI_DOMAINS_GENERIC as an option that can be selected if an architecture wants a simple implementation where the value of the domain associated with a bus is stored in struct pci_bus. The architectures that select CONFIG_PCI_DOMAINS_GENERIC will then have to implement pci_bus_assign_domain_nr() as a way of setting the domain number associated with a root bus. All child buses except the root bus will inherit the domain_nr value from their parent. Signed-off-by: Catalin Marinas <Catalin.Marinas@arm.com> [Renamed pci_set_domain_nr() to pci_bus_assign_domain_nr()] Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'include/linux/pci.h')
-rw-r--r--include/linux/pci.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 61978a460841..a494e5d775c3 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -456,6 +456,9 @@ struct pci_bus {
unsigned char primary; /* number of primary bridge */
unsigned char max_bus_speed; /* enum pci_bus_speed */
unsigned char cur_bus_speed; /* enum pci_bus_speed */
+#ifdef CONFIG_PCI_DOMAINS_GENERIC
+ int domain_nr;
+#endif
char name[48];
@@ -1288,6 +1291,24 @@ static inline int pci_domain_nr(struct pci_bus *bus) { return 0; }
static inline int pci_proc_domain(struct pci_bus *bus) { return 0; }
#endif /* CONFIG_PCI_DOMAINS */
+/*
+ * Generic implementation for PCI domain support. If your
+ * architecture does not need custom management of PCI
+ * domains then this implementation will be used
+ */
+#ifdef CONFIG_PCI_DOMAINS_GENERIC
+static inline int pci_domain_nr(struct pci_bus *bus)
+{
+ return bus->domain_nr;
+}
+void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent);
+#else
+static inline void pci_bus_assign_domain_nr(struct pci_bus *bus,
+ struct device *parent)
+{
+}
+#endif
+
/* some architectures require additional setup to direct VGA traffic */
typedef int (*arch_set_vga_state_t)(struct pci_dev *pdev, bool decode,
unsigned int command_bits, u32 flags);