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PCI: Add 'nodomains' boot option, and pci_domains_supported global

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* Introduce pci_domains_supported global, hardcoded to zero if
  !CONFIG_PCI_DOMAINS.

* Introduce 'nodomains' boot option, which clears pci_domains_supported
  on platforms that enable it by default (x86, x86-64, and others when
  they are converted to use this).

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jeff Garzik 2007-10-11 16:57:27 -04:00 committed by Greg Kroah-Hartman
parent 11949255d9
commit 32a2eea795
3 changed files with 20 additions and 2 deletions
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2
Documentation/kernel-parameters.txt
View file

@ -1274,6 +1274,8 @@ and is between 256 and 4096 characters. It is defined in the file
noaer [PCIE] If the PCIEAER kernel config parameter is
enabled, this kernel boot option can be used to
disable the use of PCIE advanced error reporting.
nodomains [PCI] Disable support for multiple PCI
root domains (aka PCI segments, in ACPI-speak).
nommconf [X86-32,X86_64] Disable use of MMCONFIG for PCI
Configuration
nomsi [MSI] If the PCI_MSI kernel config parameter is

13
drivers/pci/pci.c
View file

@ -23,6 +23,10 @@
unsigned int pci_pm_d3_delay = 10;
#ifdef CONFIG_PCI_DOMAINS
int pci_domains_supported = 1;
#endif
#define DEFAULT_CARDBUS_IO_SIZE (256)
#define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
/* pci=cbmemsize=nnM,cbiosize=nn can override this */
@ -1567,6 +1571,13 @@ int pci_select_bars(struct pci_dev *dev, unsigned long flags)
return bars;
}
static void __devinit pci_no_domains(void)
{
#ifdef CONFIG_PCI_DOMAINS
pci_domains_supported = 0;
#endif
}
static int __devinit pci_init(void)
{
struct pci_dev *dev = NULL;
@ -1588,6 +1599,8 @@ static int __devinit pci_setup(char *str)
pci_no_msi();
} else if (!strcmp(str, "noaer")) {
pci_no_aer();
} else if (!strcmp(str, "nodomains")) {
pci_no_domains();
} else if (!strncmp(str, "cbiosize=", 9)) {
pci_cardbus_io_size = memparse(str + 9, &str);
} else if (!strncmp(str, "cbmemsize=", 10)) {

7
include/linux/pci.h
View file

@ -685,13 +685,16 @@ extern void pci_unblock_user_cfg_access(struct pci_dev *dev);
* a PCI domain is defined to be a set of PCI busses which share
* configuration space.
*/
#ifndef CONFIG_PCI_DOMAINS
#ifdef CONFIG_PCI_DOMAINS
extern int pci_domains_supported;
#else
enum { pci_domains_supported = 0 };
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
#endif /* CONFIG_PCI_DOMAINS */
#else /* CONFIG_PCI is not enabled */