android_kernel_xiaomi_sm8350/arch/x86_64/mm/k8topology.c
Magnus Damm ffd10a2b77 [PATCH] x86_64: Make node boundaries consistent
The current x86_64 NUMA memory code is inconsequent when it comes to node
memory ranges. The exact behaviour varies depending on which config option
that is used.

setup_node_bootmem() has start and end as arguments and these are used to
calculate the size of the node like this: (end - start). This is all fine
if end is pointing to the first non-available byte. The problem is that the
current x86_64 code sometimes treats it as the last present byte and sometimes
as the first non-available byte. The result is that some configurations might
lose a page at the end of the range.

This patch tries to fix CONFIG_ACPI_NUMA, CONFIG_K8_NUMA and CONFIG_NUMA_EMU
so they all treat the end variable as the first non-available byte. This is
the same way as the single node code.

The patch is boot tested on dual x86_64 hardware with the above configurations,
but maybe the removed code is needed as some workaround?

Signed-off-by: Magnus Damm <magnus@valinux.co.jp>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-14 19:55:17 -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, numnodes);
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;
}