Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | Re: [PATCH] x86 PCI: Do not use interrupt links for devices using MSI-X | Date | Mon, 5 Jan 2009 14:50:27 +0100 |
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On Monday 05 January 2009, Ingo Molnar wrote: > > * Rafael J. Wysocki <rjw@sisk.pl> wrote: > > > From: Rafael J. Wysocki <rjw@sisk.pl> > > > > pcibios_enable_device() and pcibios_disable_device() don't handle > > IRQs for devices that have MSI enabled and it should tread the > > s/tread/treat
Ah, thanks.
> > devices with MSI-X enabled in the same way. > > > > Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> > > --- > > arch/x86/pci/common.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > looks good - Jesse, what do you think? > > Rafael, i'm curious is this in response to some regression/bug? Did some > box or driver get confused by us enabling/disabling the GSI? Some IRQ > flood perhaps?
Well, I don't have any MSI-X capable boxes around. :-)
I was just reviewing the code and spotted this.
> btw., there's a small observation: > > > + if (!dev->msi_enabled && !dev->msix_enabled) > > maybe a "pci_has_gsi_irq()" wrapper would make these checks cleaner and > would make things more robust, should there be any new IRQ delivery method > be introduced in the future?
Well, perhaps something like the patch below?
Thanks, Rafael
--- Subject: x86 PCI: Do not use interrupt links for devices using MSI-X (rev. 2) From: Rafael J. Wysocki <rjw@sisk.pl>
pcibios_enable_device() and pcibios_disable_device() don't handle IRQs for devices that have MSI enabled and it should treat the devices with MSI-X enabled in the same way.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> --- arch/x86/pci/common.c | 4 ++-- include/linux/pci.h | 9 +++++++++ 2 files changed, 11 insertions(+), 2 deletions(-)
Index: linux-2.6/arch/x86/pci/common.c =================================================================== --- linux-2.6.orig/arch/x86/pci/common.c +++ linux-2.6/arch/x86/pci/common.c @@ -551,14 +551,14 @@ int pcibios_enable_device(struct pci_dev if ((err = pci_enable_resources(dev, mask)) < 0) return err; - if (!dev->msi_enabled) + if (!pci_msi_enabled(dev)) return pcibios_enable_irq(dev); return 0; } void pcibios_disable_device (struct pci_dev *dev) { - if (!dev->msi_enabled && pcibios_disable_irq) + if (!pci_msi_enabled(dev) && pcibios_disable_irq) pcibios_disable_irq(dev); } Index: linux-2.6/include/linux/pci.h =================================================================== --- linux-2.6.orig/include/linux/pci.h +++ linux-2.6/include/linux/pci.h @@ -274,6 +274,15 @@ static inline void pci_add_saved_cap(str hlist_add_head(&new_cap->next, &pci_dev->saved_cap_space); } +#ifdef CONFIG_PCI_MSI +static inline bool pci_msi_enabled(struct pci_dev *pci_dev) +{ + return dev->msi_enabled || dev->msix_enabled; +} +#else +static inline bool pci_msi_enabled(struct pci_dev *pci_dev) { return false; } +#endif + /* * For PCI devices, the region numbers are assigned this way: *
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