From: Jan Kiszka <[email protected]> According to
http://thread.gmane.org/gmane.comp.emulators.kvm.devel/91388 the T310 does not properly support INTx masking as it fails to keep the PCI_STATUS_INTERRUPT bit updated once the interrupt is masked. Mark this adapter as broken so that pci_intx_mask_supported won't report it as compatible. Tested-by: Alexey Kardashevskiy <[email protected]> Signed-off-by: Jan Kiszka <[email protected]> --- Changes in v2: - Fixed device ID to Alexey's report - Added reference to the original report drivers/pci/pci.c | 3 +++ drivers/pci/quirks.c | 12 ++++++++++++ include/linux/pci.h | 2 ++ 3 files changed, 17 insertions(+), 0 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 447e834..9ae517a 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -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); diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 2a75216..28804f4 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -2929,6 +2929,18 @@ 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; +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CHELSIO, 0x0030, + quirk_broken_intx_masking); + static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f, struct pci_fixup *end) { diff --git a/include/linux/pci.h b/include/linux/pci.h index d8c379d..7ea6cf8 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -324,6 +324,8 @@ 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; /* device's INTx masking + support is not working */ pci_dev_flags_t dev_flags; atomic_t enable_cnt; /* pci_enable_device has been called */ -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
