Messages in this thread Patch in this message | | | Date | Tue, 20 Jun 2006 22:32:24 -0400 | From | Brice Goglin <> | Subject | [PATCH 3/6] Blacklist PCI-E chipsets depending on Hypertransport MSI capabality |
| |
[PATCH 3/6] Blacklist PCI-E chipsets depending on Hypertransport MSI capabality
Introduce msi_ht_cap_enabled() to check the MSI capability in the Hypertransport configuration space. It is used in a generic quirk quirk_msi_ht_cap() to check whether MSI is enabled on hypertransport chipset, and a nVidia specific quirk quirk_nvidia_ck804_msi_ht_cap() where two 2 HT MSI mappings have to be checked. Both quirks set the PCI_BUS_FLAGS_NO_MSI flags when MSI is disabled.
Signed-off-by: Brice Goglin <brice@myri.com> --- This patch will conflict with pci/pci-nvidia-quirk-to-make-aer-pci-e-extended-capability-visible.patch (currently in Greg K-H's patchset) since they both add PCI_DEVICE_ID_NVIDIA_CK804_PCIE in pci_ids.h. The first part of the changes in include/linux/pci_ids.h would have to be dropped.
drivers/pci/quirks.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/pci_ids.h | 2 + 2 files changed, 66 insertions(+)
Index: linux-mm/drivers/pci/quirks.c =================================================================== --- linux-mm.orig/drivers/pci/quirks.c 2006-06-20 22:03:27.000000000 -0400 +++ linux-mm/drivers/pci/quirks.c 2006-06-20 22:03:45.000000000 -0400 @@ -1557,6 +1557,70 @@ 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, quirk_disable_msi); + +/* Returns 1 if the HT MSI capability is found and enabled */ +static pci_bus_flags_t __devinit msi_ht_cap_enabled(struct pci_dev *dev) +{ + u8 cap_off; + int nbcap = 0; + cap_off = PCI_CAPABILITY_LIST - 1; + + /* go through all caps looking for a hypertransport msi mapping */ + while (pci_read_config_byte(dev, cap_off + 1, &cap_off) == 0 && + nbcap++ <= 256 / 4) { + u32 cap_hdr; + if (cap_off == 0 || cap_off == 0xff) + break; + cap_off &= 0xfc; + /* msi mapping section according to hypertransport spec */ + if (pci_read_config_dword(dev, cap_off, &cap_hdr) == 0 + && (cap_hdr & 0xff) == PCI_CAP_ID_HT /* hypertransport cap */ + && (cap_hdr & 0xf8000000) == 0xa8000000 /* msi mapping */) { + printk(KERN_INFO "PCI: Found HT MSI mapping on %s with capability %s\n", + pci_name(dev), cap_hdr & 0x10000 ? "enabled" : "disabled"); + return (cap_hdr & 0x10000) != 0; /* msi mapping cap enabled */ + } + } + return 0; +} + +/* Check the hypertransport MSI mapping to know whether MSI is enabled or not */ +static void __devinit quirk_msi_ht_cap(struct pci_dev *dev) +{ + if (!dev->subordinate) + return; + + if (!msi_ht_cap_enabled(dev)) { + 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; + } +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_HT2000_PCIE, quirk_msi_ht_cap); + +/* The nVidia CK804 chipset may have 2 HT MSI mappings. + * MSI are supported if the MSI capability set in any of these mappings. + */ +static void __devinit quirk_nvidia_ck804_msi_ht_cap(struct pci_dev *dev) +{ + struct pci_dev *pdev; + + if (!dev->subordinate) + return; + + /* check HT MSI cap on this chipset and the root one. + * a single one having MSI is enough to be sure that MSI are supported. + */ + pdev = pci_find_slot(dev->bus->number, 0); + if (!msi_ht_cap_enabled(dev) && !msi_ht_cap_enabled(pdev)) { + 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; + } +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_CK804_PCIE, quirk_nvidia_ck804_msi_ht_cap); #endif /* CONFIG_PCI_MSI */ EXPORT_SYMBOL(pcie_mch_quirk); Index: linux-mm/include/linux/pci_ids.h =================================================================== --- linux-mm.orig/include/linux/pci_ids.h 2006-06-20 22:02:02.000000000 -0400 +++ linux-mm/include/linux/pci_ids.h 2006-06-20 22:03:30.000000000 -0400 @@ -1027,6 +1027,7 @@ #define PCI_DEVICE_ID_NVIDIA_NVENET_8 0x0056 #define PCI_DEVICE_ID_NVIDIA_NVENET_9 0x0057 #define PCI_DEVICE_ID_NVIDIA_CK804_AUDIO 0x0059 +#define PCI_DEVICE_ID_NVIDIA_CK804_PCIE 0x005d #define PCI_DEVICE_ID_NVIDIA_NFORCE2_SMBUS 0x0064 #define PCI_DEVICE_ID_NVIDIA_NFORCE2_IDE 0x0065 #define PCI_DEVICE_ID_NVIDIA_NVENET_2 0x0066 @@ -1405,6 +1406,7 @@ #define PCI_DEVICE_ID_SERVERWORKS_LE 0x0009 #define PCI_DEVICE_ID_SERVERWORKS_GCNB_LE 0x0017 #define PCI_DEVICE_ID_SERVERWORKS_EPB 0x0103 +#define PCI_DEVICE_ID_SERVERWORKS_HT2000_PCIE 0x0132 #define PCI_DEVICE_ID_SERVERWORKS_OSB4 0x0200 #define PCI_DEVICE_ID_SERVERWORKS_CSB5 0x0201 #define PCI_DEVICE_ID_SERVERWORKS_CSB6 0x0203 - 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/
| |