Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 78 insertions, 0 deletions

diff --git a/arch/x86_64/pci/k8-bus.c b/arch/x86_64/pci/k8-bus.c
new file mode 100644
index 000000000000..62349c78db57
--- /dev/null
+++ b/arch/x86_64/pci/k8-bus.c
@@ -0,0 +1,78 @@
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <asm/mpspec.h>
+#include <linux/cpumask.h>
+
+/*
+ * 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);