From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/x86_64/pci/k8-bus.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 arch/x86_64/pci/k8-bus.c (limited to 'arch/x86_64/pci/k8-bus.c') diff --git a/arch/x86_64/pci/k8-bus.c b/arch/x86_64/pci/k8-bus.c new file mode 100644 index 00000000000..62349c78db5 --- /dev/null +++ b/arch/x86_64/pci/k8-bus.c @@ -0,0 +1,78 @@ +#include +#include +#include +#include + +/* + * This discovers the pcibus <-> node mapping on AMD K8. + * + * RED-PEN need to call this again on PCI hotplug + * RED-PEN empty cpus get reported wrong + */ + +#define NODE_ID_REGISTER 0x60 +#define NODE_ID(dword) (dword & 0x07) +#define LDT_BUS_NUMBER_REGISTER_0 0x94 +#define LDT_BUS_NUMBER_REGISTER_1 0xB4 +#define LDT_BUS_NUMBER_REGISTER_2 0xD4 +#define NR_LDT_BUS_NUMBER_REGISTERS 3 +#define SECONDARY_LDT_BUS_NUMBER(dword) ((dword >> 8) & 0xFF) +#define SUBORDINATE_LDT_BUS_NUMBER(dword) ((dword >> 16) & 0xFF) +#define PCI_DEVICE_ID_K8HTCONFIG 0x1100 + +/** + * fill_mp_bus_to_cpumask() + * fills the mp_bus_to_cpumask array based according to the LDT Bus Number + * Registers found in the K8 northbridge + */ +__init static int +fill_mp_bus_to_cpumask(void) +{ + struct pci_dev *nb_dev = NULL; + int i, j, printed; + u32 ldtbus, nid; + static int lbnr[3] = { + LDT_BUS_NUMBER_REGISTER_0, + LDT_BUS_NUMBER_REGISTER_1, + LDT_BUS_NUMBER_REGISTER_2 + }; + + while ((nb_dev = pci_get_device(PCI_VENDOR_ID_AMD, + PCI_DEVICE_ID_K8HTCONFIG, nb_dev))) { + pci_read_config_dword(nb_dev, NODE_ID_REGISTER, &nid); + + for (i = 0; i < NR_LDT_BUS_NUMBER_REGISTERS; i++) { + pci_read_config_dword(nb_dev, lbnr[i], &ldtbus); + /* + * if there are no busses hanging off of the current + * ldt link then both the secondary and subordinate + * bus number fields are set to 0. + */ + if (!(SECONDARY_LDT_BUS_NUMBER(ldtbus) == 0 + && SUBORDINATE_LDT_BUS_NUMBER(ldtbus) == 0)) { + for (j = SECONDARY_LDT_BUS_NUMBER(ldtbus); + j <= SUBORDINATE_LDT_BUS_NUMBER(ldtbus); + j++) + pci_bus_to_cpumask[j] = + node_to_cpumask(NODE_ID(nid)); + } + } + } + + /* quick sanity check */ + printed = 0; + for (i = 0; i < 256; i++) { + if (cpus_empty(pci_bus_to_cpumask[i])) { + pci_bus_to_cpumask[i] = CPU_MASK_ALL; + if (printed) + continue; + printk(KERN_ERR + "k8-bus.c: some busses have empty cpu mask\n"); + printed = 1; + } + } + + return 0; +} + +fs_initcall(fill_mp_bus_to_cpumask); -- cgit v1.2.3