android_kernel_xiaomi_sm8350/arch/x86_64/mm/k8topology.c
Andi Kleen 2aed711a39 [PATCH] x86_64: Always pass full number of nodes to NUMA hash computation
Previously the numa hash code would be confused by holes in the node space
and stop early. This is the first part of the fix for the non boot issue
with empty nodes on Opterons.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-02-17 08:00:41 -08:00

177 lines
3.9 KiB
C

/*
* AMD K8 NUMA support.
* Discover the memory map and associated nodes.
*
* This version reads it directly from the K8 northbridge.
*
* Copyright 2002,2003 Andi Kleen, SuSE Labs.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/nodemask.h>
#include <asm/io.h>
#include <linux/pci_ids.h>
#include <asm/types.h>
#include <asm/mmzone.h>
#include <asm/proto.h>
#include <asm/e820.h>
#include <asm/pci-direct.h>
#include <asm/numa.h>
static __init int find_northbridge(void)
{
int num;
for (num = 0; num < 32; num++) {
u32 header;
header = read_pci_config(0, num, 0, 0x00);
if (header != (PCI_VENDOR_ID_AMD | (0x1100<<16)))
continue;
header = read_pci_config(0, num, 1, 0x00);
if (header != (PCI_VENDOR_ID_AMD | (0x1101<<16)))
continue;
return num;
}
return -1;
}
int __init k8_scan_nodes(unsigned long start, unsigned long end)
{
unsigned long prevbase;
struct node nodes[8];
int nodeid, i, nb;
unsigned char nodeids[8];
int found = 0;
u32 reg;
unsigned numnodes;
nodemask_t nodes_parsed;
unsigned dualcore = 0;
nodes_clear(nodes_parsed);
nb = find_northbridge();
if (nb < 0)
return nb;
printk(KERN_INFO "Scanning NUMA topology in Northbridge %d\n", nb);
reg = read_pci_config(0, nb, 0, 0x60);
numnodes = ((reg >> 4) & 0xF) + 1;
printk(KERN_INFO "Number of nodes %d\n", numnodes);
memset(&nodes,0,sizeof(nodes));
prevbase = 0;
for (i = 0; i < 8; i++) {
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);
nodeid = limit & 7;
nodeids[i] = nodeid;
if ((base & 3) == 0) {
if (i < numnodes)
printk("Skipping disabled node %d\n", i);
continue;
}
if (nodeid >= numnodes) {
printk("Ignoring excess node %d (%lx:%lx)\n", nodeid,
base, limit);
continue;
}
if (!limit) {
printk(KERN_INFO "Skipping node entry %d (base %lx)\n", i,
base);
continue;
}
if ((base >> 8) & 3 || (limit >> 8) & 3) {
printk(KERN_ERR "Node %d using interleaving mode %lx/%lx\n",
nodeid, (base>>8)&3, (limit>>8) & 3);
return -1;
}
if (node_isset(nodeid, nodes_parsed)) {
printk(KERN_INFO "Node %d already present. Skipping\n",
nodeid);
continue;
}
limit >>= 16;
limit <<= 24;
limit |= (1<<24)-1;
limit++;
if (limit > end_pfn << PAGE_SHIFT)
limit = end_pfn << PAGE_SHIFT;
if (limit <= base)
continue;
base >>= 16;
base <<= 24;
if (base < start)
base = start;
if (limit > end)
limit = end;
if (limit == base) {
printk(KERN_ERR "Empty node %d\n", nodeid);
continue;
}
if (limit < base) {
printk(KERN_ERR "Node %d bogus settings %lx-%lx.\n",
nodeid, base, limit);
continue;
}
/* Could sort here, but pun for now. Should not happen anyroads. */
if (prevbase > base) {
printk(KERN_ERR "Node map not sorted %lx,%lx\n",
prevbase,base);
return -1;
}
printk(KERN_INFO "Node %d MemBase %016lx Limit %016lx\n",
nodeid, base, limit);
found++;
nodes[nodeid].start = base;
nodes[nodeid].end = limit;
prevbase = base;
node_set(nodeid, nodes_parsed);
}
if (!found)
return -1;
memnode_shift = compute_hash_shift(nodes, 8);
if (memnode_shift < 0) {
printk(KERN_ERR "No NUMA node hash function found. Contact maintainer\n");
return -1;
}
printk(KERN_INFO "Using node hash shift of %d\n", memnode_shift);
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;
setup_node_bootmem(i, nodes[i].start, nodes[i].end);
}
}
numa_init_array();
return 0;
}