x86_64: make k8topology multi-core aware

This makes k8topology multicore aware instead of limited to signle- and
dual-core CPUs.  It uses the CPUID to be more future proof.

Signed-off-by: Joachim Deguara <joachim.deguara@amd.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86_64/mm/k8topology.c b/arch/x86_64/mm/k8topology.c
index f983c75..a96006f 100644 (file)
--- a/arch/x86_64/mm/k8topology.c
+++ b/arch/x86_64/mm/k8topology.c
@@ -44,12 +44,12 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
 { 
        unsigned long prevbase;
        struct bootnode nodes[8];
-       int nodeid, i, nb; 
+       int nodeid, i, j, nb;
        unsigned char nodeids[8];
        int found = 0;
        u32 reg;
        unsigned numnodes;
-       unsigned dualcore = 0;
+       unsigned num_cores;
 
        if (!early_pci_allowed())
                return -1;
@@ -60,6 +60,9 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
 
        printk(KERN_INFO "Scanning NUMA topology in Northbridge %d\n", nb); 
 
+       num_cores = (cpuid_ecx(0x80000008) & 0xff) + 1;
+       printk(KERN_INFO "CPU has %d num_cores\n", num_cores);
+
        reg = read_pci_config(0, nb, 0, 0x60); 
        numnodes = ((reg >> 4) & 0xF) + 1;
        if (numnodes <= 1)
@@ -73,8 +76,6 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
                unsigned long base,limit; 
                u32 nodeid;
                
-               /* Undefined before E stepping, but hopefully 0 */
-               dualcore |= ((read_pci_config(0, nb, 3, 0xe8) >> 12) & 3) == 1;
                base = read_pci_config(0, nb, 1, 0x40 + i*8);
                limit = read_pci_config(0, nb, 1, 0x44 + i*8);
 
@@ -170,8 +171,8 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
        for (i = 0; i < 8; i++) {
                if (nodes[i].start != nodes[i].end) { 
                        nodeid = nodeids[i];
-                       apicid_to_node[nodeid << dualcore] = i;
-                       apicid_to_node[(nodeid << dualcore) + dualcore] = i;
+                       for (j = 0; j < num_cores; j++)
+                               apicid_to_node[(nodeid * num_cores) + j] = i;
                        setup_node_bootmem(i, nodes[i].start, nodes[i].end); 
                } 
        }