PCI: X86: Introduce and enable PCI domain support
* fix bug in pci_read() and pci_write() which prevented PCI domain
support from working (hardcoded domain 0).
* unconditionally enable CONFIG_PCI_DOMAINS
* implement pci_domain_nr() and pci_proc_domain(), as required of
all arches when CONFIG_PCI_DOMAINS is enabled.
* store domain in struct pci_sysdata, as assigned by ACPI
* support "pci=nodomains"
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 2d85e4b..515abb9 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -1137,6 +1137,11 @@
depends on PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
default y
+config PCI_DOMAINS
+ bool
+ depends on PCI
+ default y
+
source "drivers/pci/pcie/Kconfig"
source "drivers/pci/Kconfig"
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index c6fd3a6..27a391d 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -189,6 +189,12 @@
dmi_check_system(acpi_pciprobe_dmi_table);
+ if (domain && !pci_domains_supported) {
+ printk(KERN_WARNING "PCI: Multiple domains not supported "
+ "(dom %d, bus %d)\n", domain, busnum);
+ return NULL;
+ }
+
/* Allocate per-root-bus (not per bus) arch-specific data.
* TODO: leak; this memory is never freed.
* It's arguable whether it's worth the trouble to care.
@@ -199,12 +205,7 @@
return NULL;
}
- if (domain != 0) {
- printk(KERN_WARNING "PCI: Multiple domains not supported\n");
- kfree(sd);
- return NULL;
- }
-
+ sd->domain = domain;
sd->node = -1;
pxm = acpi_get_pxm(device->handle);
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index 7d6a9a5..2d71bbc 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -29,12 +29,14 @@
static int pci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *value)
{
- return raw_pci_ops->read(0, bus->number, devfn, where, size, value);
+ return raw_pci_ops->read(pci_domain_nr(bus), bus->number,
+ devfn, where, size, value);
}
static int pci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 value)
{
- return raw_pci_ops->write(0, bus->number, devfn, where, size, value);
+ return raw_pci_ops->write(pci_domain_nr(bus), bus->number,
+ devfn, where, size, value);
}
struct pci_ops pci_root_ops = {
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index b1b98e6..04d324c 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -724,6 +724,11 @@
bool "Support mmconfig PCI config space access"
depends on PCI && ACPI
+config PCI_DOMAINS
+ bool
+ depends on PCI
+ default y
+
source "drivers/pci/pcie/Kconfig"
source "drivers/pci/Kconfig"
diff --git a/include/asm-x86/pci_32.h b/include/asm-x86/pci_32.h
index 4fcacc7..0d91605 100644
--- a/include/asm-x86/pci_32.h
+++ b/include/asm-x86/pci_32.h
@@ -5,12 +5,24 @@
#ifdef __KERNEL__
struct pci_sysdata {
+ int domain; /* PCI domain */
int node; /* NUMA node */
};
/* scan a bus after allocating a pci_sysdata for it */
extern struct pci_bus *pci_scan_bus_with_sysdata(int busno);
+static inline int pci_domain_nr(struct pci_bus *bus)
+{
+ struct pci_sysdata *sd = bus->sysdata;
+ return sd->domain;
+}
+
+static inline int pci_proc_domain(struct pci_bus *bus)
+{
+ return pci_domain_nr(bus);
+}
+
#include <linux/mm.h> /* for struct page */
/* Can be used to override the logic in pci_scan_bus for skipping
diff --git a/include/asm-x86/pci_64.h b/include/asm-x86/pci_64.h
index 5da8cb0..0a123d6 100644
--- a/include/asm-x86/pci_64.h
+++ b/include/asm-x86/pci_64.h
@@ -6,12 +6,24 @@
#ifdef __KERNEL__
struct pci_sysdata {
+ int domain; /* PCI domain */
int node; /* NUMA node */
void* iommu; /* IOMMU private data */
};
extern struct pci_bus *pci_scan_bus_with_sysdata(int busno);
+static inline int pci_domain_nr(struct pci_bus *bus)
+{
+ struct pci_sysdata *sd = bus->sysdata;
+ return sd->domain;
+}
+
+static inline int pci_proc_domain(struct pci_bus *bus)
+{
+ return pci_domain_nr(bus);
+}
+
#ifdef CONFIG_CALGARY_IOMMU
static inline void* pci_iommu(struct pci_bus *bus)
{
