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authorAndi Kleen <ak@suse.de>2006-01-11 22:44:39 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-11 19:04:55 -0800
commit8a6fdd3e912e0ce6f723431d66baf704bf8a1d26 (patch)
tree930056ca5dc50ce6245cd602f044e224dd5a8776 /arch/x86_64/mm
parent95833c83f3b812c78e48db4eaa19f6c74958470b (diff)
[PATCH] x86_64: Reject SRAT tables that don't cover all memory
Broken BIOS on Iwill 8way systems reports these and it causes the bootmem allocator to crash. Add a sanity check if all the PXMs in the SRAT table cover all memory as reported by e820. If the sanity check fails the SRAT is rejected and the code will fall back to discover the NUMA topology using the K8 northbridge registers when applicable. Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/mm')
-rw-r--r--arch/x86_64/mm/srat.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c
index d96c701dbed..8b7f85608fa 100644
--- a/arch/x86_64/mm/srat.c
+++ b/arch/x86_64/mm/srat.c
@@ -17,6 +17,7 @@
#include <linux/topology.h>
#include <asm/proto.h>
#include <asm/numa.h>
+#include <asm/e820.h>
static struct acpi_table_slit *acpi_slit;
@@ -196,12 +197,39 @@ acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma)
nd->start, nd->end);
}
+/* Sanity check to catch more bad SRATs (they are amazingly common).
+ Make sure the PXMs cover all memory. */
+static int nodes_cover_memory(void)
+{
+ int i;
+ unsigned long pxmram, e820ram;
+
+ pxmram = 0;
+ for_each_node_mask(i, nodes_parsed) {
+ unsigned long s = nodes[i].start >> PAGE_SHIFT;
+ unsigned long e = nodes[i].end >> PAGE_SHIFT;
+ pxmram += e - s;
+ pxmram -= e820_hole_size(s, e);
+ }
+
+ e820ram = end_pfn - e820_hole_size(0, end_pfn);
+ if (pxmram < e820ram) {
+ printk(KERN_ERR
+ "SRAT: PXMs only cover %luMB of your %luMB e820 RAM. Not used.\n",
+ (pxmram << PAGE_SHIFT) >> 20,
+ (e820ram << PAGE_SHIFT) >> 20);
+ return 0;
+ }
+ return 1;
+}
+
void __init acpi_numa_arch_fixup(void) {}
/* Use the information discovered above to actually set up the nodes. */
int __init acpi_scan_nodes(unsigned long start, unsigned long end)
{
int i;
+
if (acpi_numa <= 0)
return -1;
@@ -212,6 +240,11 @@ int __init acpi_scan_nodes(unsigned long start, unsigned long end)
node_clear(i, nodes_parsed);
}
+ if (!nodes_cover_memory()) {
+ bad_srat();
+ return -1;
+ }
+
memnode_shift = compute_hash_shift(nodes, nodes_weight(nodes_parsed));
if (memnode_shift < 0) {
printk(KERN_ERR