From fbebb9fd22581b6422d60669c4ff86ce99d6cdba Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Sat, 16 Jun 2012 14:40:22 -0600 Subject: [PATCH] PCI: add infrastructure for devices with broken INTx masking 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 Signed-off-by: Bjorn Helgaas --- drivers/pci/pci.c | 3 +++ drivers/pci/quirks.c | 10 ++++++++++ include/linux/pci.h | 1 + 3 files changed, 14 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 447e83472c01..9ae517a68360 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 2a7521677541..cc13415416d7 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -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) { diff --git a/include/linux/pci.h b/include/linux/pci.h index d8c379dba6ad..40a039f1dffb 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -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 */ -- 2.39.2