From 3b08606dc2991bcdab14139efd9ed9d492f5f901 Mon Sep 17 00:00:00 2001 From: keith mannthey Date: Fri, 29 Sep 2006 01:58:46 -0700 Subject: [PATCH] convert i386 Summit subarch to use SRAT info for apicid_to_node calls Convert the i386 summit subarch apicid_to_node to use node information provided by the SRAT. It was discussed a little on LKML a few weeks ago and was seen as an acceptable fix. The current way of obtaining the nodeid static inline int apicid_to_node(int logical_apicid) { return logical_apicid >> 5; } is just not correct for all summit systems/bios. Assuming the apicid matches the Linux node number require a leap of faith that the bios mapped out the apicids a set way. Modern summit HW (IBM x460) does not layout its bios in the manner for various reasons and is unable to boot i386 numa. The best way to get the correct apicid to node information is from the SRAT table during boot. It lays out what apicid belongs to what node. I use this information to create a table for use at run time. Signed-off-by: Keith Mannthey Cc: Andi Kleen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/i386/kernel/srat.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'arch/i386/kernel/srat.c') diff --git a/arch/i386/kernel/srat.c b/arch/i386/kernel/srat.c index 3241312..f7e735c 100644 --- a/arch/i386/kernel/srat.c +++ b/arch/i386/kernel/srat.c @@ -30,6 +30,7 @@ #include #include #include +#include /* * proximity macros and definitions @@ -54,6 +55,7 @@ struct node_memory_chunk_s { static struct node_memory_chunk_s node_memory_chunk[MAXCHUNKS]; static int num_memory_chunks; /* total number of memory chunks */ +static u8 __initdata apicid_to_pxm[MAX_APICID]; extern void * boot_ioremap(unsigned long, unsigned long); @@ -69,6 +71,8 @@ static void __init parse_cpu_affinity_structure(char *p) /* mark this node as "seen" in node bitmap */ BMAP_SET(pxm_bitmap, cpu_affinity->proximity_domain); + apicid_to_pxm[cpu_affinity->apic_id] = cpu_affinity->proximity_domain; + printk("CPU 0x%02X in proximity domain 0x%02X\n", cpu_affinity->apic_id, cpu_affinity->proximity_domain); } @@ -235,6 +239,9 @@ static int __init acpi20_parse_srat(struct acpi_table_srat *sratp) printk("Number of logical nodes in system = %d\n", num_online_nodes()); printk("Number of memory chunks in system = %d\n", num_memory_chunks); + for (i = 0; i < MAX_APICID; i++) + apicid_2_node[i] = pxm_to_node(apicid_to_pxm[i]); + for (j = 0; j < num_memory_chunks; j++){ struct node_memory_chunk_s * chunk = &node_memory_chunk[j]; printk("chunk %d nid %d start_pfn %08lx end_pfn %08lx\n", -- cgit v1.1