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PCI: add infrastructure for devices with broken INTx masking

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pci_intx_mask_supported() assumes INTx masking is supported if the
PCI_COMMAND_INTX_DISABLE bit is writable.  But when that bit is set,
some devices don't actually mask INTx or update PCI_STATUS_INTERRUPT
as we expect.

This patch adds a way for quirks to identify these broken devices.

[bhelgaas: split out from Chelsio quirk addition]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Bjorn Helgaas 2012-06-16 14:40:22 -06:00
parent cfaf025112
commit fbebb9fd22
3 changed files with 14 additions and 0 deletions
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3
drivers/pci/pci.c
View file

@ -2876,6 +2876,9 @@ bool pci_intx_mask_supported(struct pci_dev *dev)
bool mask_supported = false;
u16 orig, new;
if (dev->broken_intx_masking)
return false;
pci_cfg_access_lock(dev);
pci_read_config_word(dev, PCI_COMMAND, &orig);

10
drivers/pci/quirks.c
View file

@ -2929,6 +2929,16 @@ static void __devinit disable_igfx_irq(struct pci_dev *dev)
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x0102, disable_igfx_irq);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, 0x010a, disable_igfx_irq);
/*
* Some devices may pass our check in pci_intx_mask_supported if
* PCI_COMMAND_INTX_DISABLE works though they actually do not properly
* support this feature.
*/
static void __devinit quirk_broken_intx_masking(struct pci_dev *dev)
{
dev->broken_intx_masking = 1;
}
static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f,
struct pci_fixup *end)
{

1
include/linux/pci.h
View file

@ -324,6 +324,7 @@ struct pci_dev {
unsigned int is_hotplug_bridge:1;
unsigned int __aer_firmware_first_valid:1;
unsigned int __aer_firmware_first:1;
unsigned int broken_intx_masking:1;
pci_dev_flags_t dev_flags;
atomic_t enable_cnt; /* pci_enable_device has been called */