From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx> AMD hostbridges gnenerally show up as PCI device 0:18.0. This patch adds logic to automatically probe the device at this location and check PCI device class code. This patch supports platforms with the following AMD hostbridge types: (K8, family10h, 11h, 12h, 14h 15h and 16h processors). Reference(s): https://bugzilla.kernel.org/show_bug.cgi?id=72051 Advanced Micro Devices (AMD), "BIOS and Kernel Developer's Guide (BKDG) for AMD Family 15h Models 00h-0fh Processors." Section 3.4 Device [1F:18]h Function 1 Configuration Registers; D18F1x[EC:E0] Configuration Map, 42301 Rev 3.12 - October 11, 2012. Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx> Signed-off-by: Myron Stowe <myron.stowe@xxxxxxxxxx> Tested-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@xxxxxxx> --- arch/x86/pci/amd_bus.c | 71 ++++++++++++++++++++++++++++++++---------------- 1 files changed, 47 insertions(+), 24 deletions(-) diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c index e88f4c5..c8cd75c 100644 --- a/arch/x86/pci/amd_bus.c +++ b/arch/x86/pci/amd_bus.c @@ -11,27 +11,34 @@ #include "bus_numa.h" +#define AMD_NB_F0_NODE_ID 0x60 +#define AMD_NB_F0_UNIT_ID 0x64 +#define AMD_NB_F1_CONFIG_MAP_REG 0xe0 + +#define RANGE_NUM 16 +#define AMD_NB_F1_CONFIG_MAP_RANGES 4 + /* - * This discovers the pcibus <-> node mapping on AMD K8. - * also get peer root bus resource for io,mmio + * This discovers the pcibus <-> node mapping on AMD K8, Family 10h, 12h, + * 14h, 15h, and 16h processor based systems. This also gets peer root bus + * resources corresponding to I/O and MMIO addresses. */ -struct pci_hostbridge_probe { +struct amd_hostbridge { u32 bus; u32 slot; - u32 vendor; u32 device; }; -static struct pci_hostbridge_probe pci_probes[] __initdata = { - { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1100 }, - { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1200 }, - { 0xff, 0, PCI_VENDOR_ID_AMD, 0x1200 }, - { 0, 0x18, PCI_VENDOR_ID_AMD, 0x1300 }, +static struct amd_hostbridge hb_probes[] __initdata = { + /* Standard AMD Hostbriges are at bus 0x0 slot 0x18. + * In case of PCI_ANY_ID, the logic will try matching + * PCI_CLASS_BRIDGE_HOST instead. + */ + { 0x0 , 0x18, PCI_ANY_ID }, + { 0xff, 0 , PCI_DEVICE_ID_AMD_10H_NB_HT }, }; -#define RANGE_NUM 16 - static struct pci_root_info __init *find_pci_root_info(int node, int link) { struct pci_root_info *info; @@ -75,31 +82,47 @@ static int __init early_fill_mp_bus_info(void) return -1; found = false; - for (i = 0; i < ARRAY_SIZE(pci_probes); i++) { + for (i = 0; i < ARRAY_SIZE(hb_probes); i++) { u32 id; u16 device; u16 vendor; + u32 class; - bus = pci_probes[i].bus; - slot = pci_probes[i].slot; + bus = hb_probes[i].bus; + slot = hb_probes[i].slot; id = read_pci_config(bus, slot, 0, PCI_VENDOR_ID); - vendor = id & 0xffff; device = (id>>16) & 0xffff; - if (pci_probes[i].vendor == vendor && - pci_probes[i].device == device) { - found = true; - break; + class = read_pci_config(bus, slot, 0, + PCI_CLASS_REVISION) >> 16; + + if (PCI_VENDOR_ID_AMD == vendor) { + if (hb_probes[i].device == device) { + found = true; + break; + } + + if ((hb_probes[i].device == PCI_ANY_ID) && + (class == PCI_CLASS_BRIDGE_HOST)) { + hb_probes[i].device = device; + found = true; + break; + } } } - if (!found) + if (!found) { + pr_warn("AMD hostbridge not found\n"); return 0; + } - for (i = 0; i < 4; i++) { + pr_debug("Found AMD hostbridge at %x:%x.0\n", bus, slot); + + for (i = 0; i < AMD_NB_F1_CONFIG_MAP_RANGES; i++) { int min_bus; int max_bus; - reg = read_pci_config(bus, slot, 1, 0xe0 + (i << 2)); + reg = read_pci_config(bus, slot, 1, + AMD_NB_F1_CONFIG_MAP_REG + (i << 2)); /* Check if that register is enabled for bus range */ if ((reg & 7) != 3) @@ -114,9 +137,9 @@ static int __init early_fill_mp_bus_info(void) } /* get the default node and link for left over res */ - reg = read_pci_config(bus, slot, 0, 0x60); + reg = read_pci_config(bus, slot, 0, AMD_NB_F0_NODE_ID); def_node = (reg >> 8) & 0x07; - reg = read_pci_config(bus, slot, 0, 0x64); + reg = read_pci_config(bus, slot, 0, AMD_NB_F0_UNIT_ID); def_link = (reg >> 8) & 0x03; memset(range, 0, sizeof(range)); -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
