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Subject[PATCH v2 2/2] 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>
---
Revised per Andi's comments, and split into two patches.

As found in jgarzik/misc-2.6.git#ALL and jgarzik/misc-2.6.git#pciseg.

arch/i386/Kconfig | 5 +++++
arch/i386/pci/acpi.c | 13 +++++++------
arch/i386/pci/common.c | 6 ++++--
arch/x86_64/Kconfig | 5 +++++
include/asm-i386/pci.h | 12 ++++++++++++
include/asm-x86_64/pci.h | 12 ++++++++++++
6 files changed, 45 insertions(+), 8 deletions(-)

d2978874ffb1a980238ab68aa528b700a1ec2b30
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 97b64d7..5237791 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -1137,6 +1137,11 @@ config PCI_MMCONFIG
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/i386/pci/acpi.c b/arch/i386/pci/acpi.c
index bc8a44b..5c9827b 100644
--- a/arch/i386/pci/acpi.c
+++ b/arch/i386/pci/acpi.c
@@ -11,6 +11,12 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do
struct pci_sysdata *sd;
int pxm;

+ 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.
@@ -21,12 +27,7 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do
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/i386/pci/common.c b/arch/i386/pci/common.c
index ebc6f3c..6d7a274 100644
--- a/arch/i386/pci/common.c
+++ b/arch/i386/pci/common.c
@@ -29,12 +29,14 @@ struct pci_raw_ops *raw_pci_ops;

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 b4d9089..f3ea9e0 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -724,6 +724,11 @@ config PCI_MMCONFIG
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-i386/pci.h b/include/asm-i386/pci.h
index 4fcacc7..0d91605 100644
--- a/include/asm-i386/pci.h
+++ b/include/asm-i386/pci.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_64/pci.h b/include/asm-x86_64/pci.h
index 5da8cb0..0a123d6 100644
--- a/include/asm-x86_64/pci.h
+++ b/include/asm-x86_64/pci.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)
{
-
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