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Commit a79e4198 authored by Jeff Garzik's avatar Jeff Garzik Committed by Greg Kroah-Hartman
Browse files

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: default avatarJeff Garzik <jgarzik@redhat.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 32a2eea7

arch/i386/Kconfig

+5 −0
Original line number Diff line number Diff line
@@ -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"

arch/x86/pci/acpi.c

+7 −6
Original line number Diff line number Diff line
@@ -189,6 +189,12 @@ struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int do 


	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 @@ 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);

arch/x86/pci/common.c

+4 −2
Original line number Diff line number Diff line
@@ -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 = {

arch/x86_64/Kconfig

+5 −0
Original line number Diff line number Diff line
@@ -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"

include/asm-x86/pci_32.h

+12 −0
Original line number Diff line number Diff line
@@ -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