This patch provides a way to set the ACPI domain number in PCI code.
pci_create_root_bus is called with NULL as parent in ACPI. This
ends up calling pci_bus_assign_domain_nr with a NULL parent.
So we define acpi_pci_bus_domain_nr() which is meant to retrieve
the PCI domain number based on 'struct pci_bus' in the ACPI way.
pci_bus_assign_domain_nr() is updated to call acpi_pci_bus_domain_nr()
and assign domain number on the root bus, in case of ACPI.
acpi_pci_bus_domain_nr function is stub for now.
While at it, for the sake of code clarity we put ACPI and DT domain
assign methods into the corresponding helpers.
Signed-off-by: Jayachandran C <jchandra@xxxxxxxxxxxx>
Signed-off-by: Tomasz Nowicki <tn@xxxxxxxxxxxx>
---
drivers/pci/pci.c | 11 +++++++++--
include/linux/pci-acpi.h | 5 +++++
2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index ff97a0b..a1d7bcf 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -19,6 +19,7 @@
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/log2.h>
+#include <linux/pci-acpi.h>
#include <linux/pci-aspm.h>
#include <linux/pm_wakeup.h>
#include <linux/interrupt.h>
@@ -4918,7 +4919,7 @@ int pci_get_new_domain_nr(void)
}
#ifdef CONFIG_PCI_DOMAINS_GENERIC
-void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
+static int of_pci_bus_domain_nr(struct device *parent)
{
static int use_dt_domains = -1;
int domain = -1;
@@ -4962,7 +4963,13 @@ void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
domain = -1;
}
- bus->domain_nr = domain;
+ return domain;
+}
+
+void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
+{
+ bus->domain_nr = acpi_disabled ? of_pci_bus_domain_nr(parent) :
+ acpi_pci_bus_domain_nr(bus);
}
#endif
#endif
diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
index 89ab057..09f9f02 100644
--- a/include/linux/pci-acpi.h
+++ b/include/linux/pci-acpi.h
@@ -111,6 +111,11 @@ static inline void acpi_pci_add_bus(struct pci_bus *bus) { }
static inline void acpi_pci_remove_bus(struct pci_bus *bus) { }
#endif /* CONFIG_ACPI */
+static inline int acpi_pci_bus_domain_nr(struct pci_bus *bus)
+{
+ return 0;
+}
+
#ifdef CONFIG_ACPI_APEI
extern bool aer_acpi_firmware_first(void);
#else
--
1.9.1
--
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