From 8a6fdd3e912e0ce6f723431d66baf704bf8a1d26 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Wed, 11 Jan 2006 22:44:39 +0100 Subject: [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 Signed-off-by: Linus Torvalds --- arch/x86_64/mm/srat.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c index d96c701dbed6..8b7f85608fa8 100644 --- a/arch/x86_64/mm/srat.c +++ b/arch/x86_64/mm/srat.c @@ -17,6 +17,7 @@ #include #include #include +#include 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 -- cgit v1.2.2