On 2012-05-25 11:11, Bjorn Helgaas wrote: > On Fri, May 25, 2012 at 8:02 AM, Jan Kiszka <jan.kiszka@xxxxxxxxxxx> wrote: >> According to Alexey, 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. > > Please include a reference to a bugzilla, mailing list discussion, or > other details about how this was found and debugged. Thanks! Sorry, it's documented here: http://thread.gmane.org/gmane.comp.emulators.kvm.devel/91388. Will repost with this information included once Alexey provided his tested-by. Jan > >> Reported-by: Alexey Kardashevskiy <aik@xxxxxxxxx> >> Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxx> >> --- >> >> Alexey, please test if this catches your case correctly. >> >> 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 8f16900..3a1aeb5 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..151e174 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, 0x0010, >> + 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 17b7b5b..c7cfd73 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 -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
