Messages in this thread Patch in this message | | | Date | Thu, 22 Jun 2006 09:56:01 -0400 | From | Brice Goglin <> | Subject | [PATCH 3/6 v4] Blacklist PCI-E chipsets depending on Hypertransport MSI capabality |
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[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> --- We now use pci_find_next_capability() to simplify the HT MSI check. And this patch does not define PCI_DEVICE_ID_NVIDIA_CK804_PCIE anymore since a patch defining it has been merged meanwhile.
drivers/pci/quirks.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/pci_ids.h | 1 2 files changed, 59 insertions(+)
Index: linux-mm/drivers/pci/quirks.c =================================================================== --- linux-mm.orig/drivers/pci/quirks.c 2006-06-22 09:38:57.000000000 -0400 +++ linux-mm/drivers/pci/quirks.c 2006-06-22 09:47:46.000000000 -0400 @@ -1603,6 +1603,64 @@ 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); + +/* Go through the list of Hypertransport capabilities and + * return 1 if a HT MSI capability is found and enabled */ +static pci_bus_flags_t __devinit msi_ht_cap_enabled(struct pci_dev *dev) +{ + u8 pos; + for (pos = pci_find_capability(dev, PCI_CAP_ID_HT); + pos; + pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_HT)) { + u32 cap_hdr; + /* MSI mapping section according to Hypertransport spec */ + if (pci_read_config_dword(dev, pos, &cap_hdr) == 0 + && (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 2006-06-21 08:16:06.000000000 -0400 +++ linux-mm/include/linux/pci_ids.h 2006-06-22 09:39:23.000000000 -0400 @@ -1406,6 +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/
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