Messages in this thread Patch in this message | | | Date | Sun, 02 Jul 2006 20:40:02 -0400 | From | Brice Goglin <> | Subject | [patch 3/7] Check root chipset no_msi flag instead of all parent busses flags |
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MSI only requires support in the root chipset, which may not even have a subordinate bus. pci_msi_supported() now checks the no_msi flag in the root_chipset pci_dev struct instead of the PCI_BUS_FLAGS_NO_MSI flag of all its parent busses. The MSI quirk now sets the no_msi flag accordingly.
Signed-off-by: Brice Goglin <brice@myri.com> --- drivers/pci/msi.c | 15 ++++++++++----- drivers/pci/quirks.c | 10 ++++------ 2 files changed, 14 insertions(+), 11 deletions(-)
Index: linux-git/drivers/pci/msi.c =================================================================== --- linux-git.orig/drivers/pci/msi.c 2006-07-02 20:28:28.000000000 -0400 +++ linux-git/drivers/pci/msi.c 2006-07-02 20:28:58.000000000 -0400 @@ -905,19 +905,24 @@ * @dev: pointer to the pci_dev data structure of MSI device function * * MSI must be globally enabled and supported by the device and - * its parent busses. + * its root chipset. **/ static int pci_msi_supported(struct pci_dev * dev) { - struct pci_bus *bus; + struct pci_dev *pdev; if (!pci_msi_enable || !dev || dev->no_msi) return -1; - for (bus = dev->bus; bus; bus = bus->parent) - if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI) - return -1; + /* find root complex for our device */ + pdev = dev; + while (pdev->bus && pdev->bus->self) + pdev = pdev->bus->self; + + /* check whether it supports MSI */ + if (pdev->no_msi) + return -1; return 0; } Index: linux-git/drivers/pci/quirks.c =================================================================== --- linux-git.orig/drivers/pci/quirks.c 2006-07-02 20:25:32.000000000 -0400 +++ linux-git/drivers/pci/quirks.c 2006-07-02 20:28:41.000000000 -0400 @@ -1508,12 +1508,10 @@ /* Disable MSI on chipsets that are known to not support it */ static void __devinit quirk_disable_msi(struct pci_dev *dev) { - if (dev->subordinate) { - printk(KERN_WARNING "PCI: MSI quirk detected. " - "PCI_BUS_FLAGS_NO_MSI set for %s subordinate bus.\n", - pci_name(dev)); - dev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI; - } + printk(KERN_WARNING "PCI: MSI quirk detected. " + "MSI disabled on chipset %s.\n", + pci_name(dev)); + dev->no_msi = 1; } DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8131_BRIDGE, quirk_disable_msi); DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_GCNB_LE, - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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