diff options
Diffstat (limited to 'sys/arch/i386')
| -rw-r--r-- | sys/arch/i386/pci/pci_machdep.c | 107 |
1 files changed, 106 insertions, 1 deletions
diff --git a/sys/arch/i386/pci/pci_machdep.c b/sys/arch/i386/pci/pci_machdep.c index d22f875dc77..13f4e92a488 100644 --- a/sys/arch/i386/pci/pci_machdep.c +++ b/sys/arch/i386/pci/pci_machdep.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pci_machdep.c,v 1.61 2011/05/29 10:47:42 kettenis Exp $ */ +/* $OpenBSD: pci_machdep.c,v 1.62 2011/05/30 19:24:28 kettenis Exp $ */ /* $NetBSD: pci_machdep.c,v 1.28 1997/06/06 23:29:17 thorpej Exp $ */ /*- @@ -195,6 +195,9 @@ void pci_attach_hook(struct device *parent, struct device *self, struct pcibus_attach_args *pba) { + pci_chipset_tag_t pc = pba->pba_pc; + pcitag_t tag; + pcireg_t id, class; #if NBIOS > 0 if (pba->pba_bus == 0) @@ -204,6 +207,108 @@ pci_attach_hook(struct device *parent, struct device *self, if (pba->pba_bus == 0) printf(": configuration mode %d", pci_mode); #endif + + if (pba->pba_bus != 0) + return; + + /* + * In order to decide whether the system supports MSI we look + * at the host bridge, which should be device 0 function 0 on + * bus 0. It is better to not enable MSI on systems that + * support it than the other way around, so be conservative + * here. So we don't enable MSI if we don't find a host + * bridge there. We also deliberately don't enable MSI on + * chipsets from low-end manifacturers like VIA and SiS. + */ + tag = pci_make_tag(pc, 0, 0, 0); + id = pci_conf_read(pc, tag, PCI_ID_REG); + class = pci_conf_read(pc, tag, PCI_CLASS_REG); + + if (PCI_CLASS(class) != PCI_CLASS_BRIDGE || + PCI_SUBCLASS(class) != PCI_SUBCLASS_BRIDGE_HOST) + return; + + switch (PCI_VENDOR(id)) { + case PCI_VENDOR_INTEL: + /* + * For Intel platforms, MSI support was introduced + * with the new Pentium 4 processor interrupt delivery + * mechanism, so we blacklist all PCI chipsets that + * support Pentium III and earlier CPUs. + */ + switch (PCI_PRODUCT(id)) { + case PCI_PRODUCT_INTEL_PCMC: /* 82434LX/NX */ + case PCI_PRODUCT_INTEL_82437FX: + case PCI_PRODUCT_INTEL_82437MX: + case PCI_PRODUCT_INTEL_82437VX: + case PCI_PRODUCT_INTEL_82439HX: + case PCI_PRODUCT_INTEL_82439TX: + case PCI_PRODUCT_INTEL_82440BX: + case PCI_PRODUCT_INTEL_82440BX_AGP: + case PCI_PRODUCT_INTEL_82440MX_HB: + case PCI_PRODUCT_INTEL_82441FX: + case PCI_PRODUCT_INTEL_82443BX: + case PCI_PRODUCT_INTEL_82443BX_AGP: + case PCI_PRODUCT_INTEL_82443BX_NOAGP: + case PCI_PRODUCT_INTEL_82443GX: + case PCI_PRODUCT_INTEL_82443LX: + case PCI_PRODUCT_INTEL_82443LX_AGP: + case PCI_PRODUCT_INTEL_82810_HB: + case PCI_PRODUCT_INTEL_82810E_HB: + case PCI_PRODUCT_INTEL_82815_HB: + case PCI_PRODUCT_INTEL_82820_HB: + case PCI_PRODUCT_INTEL_82830M_HB: + case PCI_PRODUCT_INTEL_82840_HB: + break; + default: + pba->pba_flags |= PCI_FLAGS_MSI_ENABLED; + break; + } + break; + case PCI_VENDOR_NVIDIA: + /* + * Since NVIDIA chipsets are completely undocumented, + * we have to make a guess here. We assume that all + * chipsets that support PCIe include support for MSI, + * since support for MSI is mandated by the PCIe + * standard. + */ + switch (PCI_PRODUCT(id)) { + case PCI_PRODUCT_NVIDIA_NFORCE_PCHB: + case PCI_PRODUCT_NVIDIA_NFORCE2_PCHB: + break; + default: + pba->pba_flags |= PCI_FLAGS_MSI_ENABLED; + break; + } + break; + case PCI_VENDOR_AMD: + /* + * The AMD-750 and AMD-760 chipsets don't support MSI. + */ + switch (PCI_PRODUCT(id)) { + case PCI_PRODUCT_AMD_SC751_SC: + case PCI_PRODUCT_AMD_761_PCHB: + case PCI_PRODUCT_AMD_762_PCHB: + break; + default: + pba->pba_flags |= PCI_FLAGS_MSI_ENABLED; + break; + } + break; + } + + /* + * Don't enable MSI on a HyperTransport bus. In order to + * determine that bus 0 is a HyperTransport bus, we look at + * device 24 function 0, which is the HyperTransport + * host/primary interface integrated on most 64-bit AMD CPUs. + * If that device has a HyperTransport capability, bus 0 must + * be a HyperTransport bus and we disable MSI. + */ + tag = pci_make_tag(pc, 0, 24, 0); + if (pci_get_capability(pc, tag, PCI_CAP_HT, NULL, NULL)) + pba->pba_flags &= ~PCI_FLAGS_MSI_ENABLED; } int |