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[PATCH] PCI: Provide a boot parameter to disable MSI

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Several drivers are starting to grow options to disable MSI.  However,
it's often a host chipset issue, not something which individual drivers
should handle.  So we add the pci=nomsi kernel parameter to allow the user
to disable MSI modes for systems we haven't added to the quirk list yet.

Signed-off-by: Matthew Wilcox <[email protected]>
Signed-off-by: Randy Dunlap <[email protected]>
Acked-by: Jeff Garzik <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Matthew Wilcox 2006-03-05 22:33:34 -07:00 • committed by Greg Kroah-Hartman
commit 309e57df7b
5 changed files with 26 additions and 2 deletions
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4
drivers/pci/Kconfig
View file

@ -11,6 +11,10 @@ config PCI_MSI
generate an interrupt using an inbound Memory Write on its
PCI bus instead of asserting a device IRQ pin.
Use of PCI MSI interrupts can be disabled at kernel boot time
by using the 'pci=nomsi' option. This disables MSI for the
entire system.
If you don't know what to do here, say N.
config PCI_DEBUG

10
drivers/pci/msi.c
View file

@ -765,8 +765,11 @@ void pci_disable_msi(struct pci_dev* dev)
u16 control;
unsigned long flags;
if (!pci_msi_enable)
return;
if (!dev)
return;
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (!pos)
return;
@ -1026,6 +1029,8 @@ void pci_disable_msix(struct pci_dev* dev)
int pos, temp;
u16 control;
if (!pci_msi_enable)
return;
if (!dev)
return;
@ -1152,6 +1157,11 @@ void msi_remove_pci_irq_vectors(struct pci_dev* dev)
}
}
void pci_no_msi(void)
{
pci_msi_enable = 0;
}
EXPORT_SYMBOL(pci_enable_msi);
EXPORT_SYMBOL(pci_disable_msi);
EXPORT_SYMBOL(pci_enable_msix);

8
drivers/pci/pci.c
View file

@ -900,8 +900,12 @@ static int __devinit pci_setup(char *str)
if (k)
*k++ = 0;
if (*str && (str = pcibios_setup(str)) && *str) {
/* PCI layer options should be handled here */
printk(KERN_ERR "PCI: Unknown option `%s'\n", str);
if (!strcmp(str, "nomsi")) {
pci_no_msi();
} else {
printk(KERN_ERR "PCI: Unknown option `%s'\n",
str);
}
}
str = k;
}

2
drivers/pci/pci.h
View file

@ -50,8 +50,10 @@ extern int pci_msi_quirk;
#ifdef CONFIG_PCI_MSI
void disable_msi_mode(struct pci_dev *dev, int pos, int type);
void pci_no_msi(void);
#else
static inline void disable_msi_mode(struct pci_dev *dev, int pos, int type) { }
static inline void pci_no_msi(void) { }
#endif
extern int pcie_mch_quirk;