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Date: Tue, 25 Mar 2008 10:14:35 -0700
From: Suresh Siddha <suresh.b.siddha@...el.com>
To: mingo@...e.hu, hpa@...or.com, tglx@...utronix.de
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [patch] srat, x86_64: Add support for nodes spanning other nodes
For example, If the physical address layout on a two node system with 8 GB
memory is something like:
node 0: 0-2GB, 4-6GB
node 1: 2-4GB, 6-8GB
Current kernels fail to boot/detect this NUMA topology.
ACPI SRAT tables can expose such a topology which needs to be supported.
Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
---
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 227fdb0..99eb102 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -880,6 +880,15 @@ config X86_64_ACPI_NUMA
help
Enable ACPI SRAT based node topology detection.
+# Some NUMA nodes have memory ranges that span
+# other nodes. Even though a pfn is valid and
+# between a node's start and end pfns, it may not
+# reside on that node. See memmap_init_zone()
+# for details.
+config NODES_SPAN_OTHER_NODES
+ def_bool y
+ depends on X86_64_ACPI_NUMA
+
config NUMA_EMU
bool "NUMA emulation"
depends on X86_64 && NUMA
diff --git a/arch/x86/mm/k8topology_64.c b/arch/x86/mm/k8topology_64.c
index 1f249f1..1f476e4 100644
--- a/arch/x86/mm/k8topology_64.c
+++ b/arch/x86/mm/k8topology_64.c
@@ -192,7 +192,7 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end)
if (!found)
return -1;
- memnode_shift = compute_hash_shift(nodes, 8);
+ memnode_shift = compute_hash_shift(nodes, 8, NULL);
if (memnode_shift < 0) {
printk(KERN_ERR "No NUMA node hash function found. Contact maintainer\n");
return -1;
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index ebfc1f8..b04fce7 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -58,7 +58,7 @@ unsigned long __initdata nodemap_size;
* -1 if node overlap or lost ram (shift too big)
*/
static int __init populate_memnodemap(const struct bootnode *nodes,
- int numnodes, int shift)
+ int numnodes, int shift, int *nodeids)
{
unsigned long addr, end;
int i, res = -1;
@@ -74,7 +74,12 @@ static int __init populate_memnodemap(const struct bootnode *nodes,
do {
if (memnodemap[addr >> shift] != NUMA_NO_NODE)
return -1;
- memnodemap[addr >> shift] = i;
+
+ if (!nodeids)
+ memnodemap[addr >> shift] = i;
+ else
+ memnodemap[addr >> shift] = nodeids[i];
+
addr += (1UL << shift);
} while (addr < end);
res = 1;
@@ -137,7 +142,8 @@ static int __init extract_lsb_from_nodes(const struct bootnode *nodes,
return i;
}
-int __init compute_hash_shift(struct bootnode *nodes, int numnodes)
+int __init compute_hash_shift(struct bootnode *nodes, int numnodes,
+ int *nodeids)
{
int shift;
@@ -147,7 +153,7 @@ int __init compute_hash_shift(struct bootnode *nodes, int numnodes)
printk(KERN_DEBUG "NUMA: Using %d for the hash shift.\n",
shift);
- if (populate_memnodemap(nodes, numnodes, shift) != 1) {
+ if (populate_memnodemap(nodes, numnodes, shift, nodeids) != 1) {
printk(KERN_INFO "Your memory is not aligned you need to "
"rebuild your kernel with a bigger NODEMAPSIZE "
"shift=%d\n", shift);
@@ -491,7 +497,7 @@ done:
}
}
out:
- memnode_shift = compute_hash_shift(nodes, num_nodes);
+ memnode_shift = compute_hash_shift(nodes, num_nodes, NULL);
if (memnode_shift < 0) {
memnode_shift = 0;
printk(KERN_ERR "No NUMA hash function found. NUMA emulation "
diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
index 04e06c8..768ffac 100644
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -31,6 +31,10 @@ static struct bootnode nodes_add[MAX_NUMNODES];
static int found_add_area __initdata;
int hotadd_percent __initdata = 0;
+static int num_node_memblks __initdata;
+static struct bootnode node_memblk_range[NR_NODE_MEMBLKS] __initdata;
+static int memblk_nodeid[NR_NODE_MEMBLKS] __initdata;
+
/* Too small nodes confuse the VM badly. Usually they result
from BIOS bugs. */
#define NODE_MIN_SIZE (4*1024*1024)
@@ -40,17 +44,17 @@ static __init int setup_node(int pxm)
return acpi_map_pxm_to_node(pxm);
}
-static __init int conflicting_nodes(unsigned long start, unsigned long end)
+static __init int conflicting_memblks(unsigned long start, unsigned long end)
{
int i;
- for_each_node_mask(i, nodes_parsed) {
- struct bootnode *nd = &nodes[i];
+ for (i = 0; i < num_node_memblks; i++) {
+ struct bootnode *nd = &node_memblk_range[i];
if (nd->start == nd->end)
continue;
if (nd->end > start && nd->start < end)
- return i;
+ return memblk_nodeid[i];
if (nd->end == end && nd->start == start)
- return i;
+ return memblk_nodeid[i];
}
return -1;
}
@@ -254,7 +258,7 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
bad_srat();
return;
}
- i = conflicting_nodes(start, end);
+ i = conflicting_memblks(start, end);
if (i == node) {
printk(KERN_WARNING
"SRAT: Warning: PXM %d (%lx-%lx) overlaps with itself (%Lx-%Lx)\n",
@@ -279,10 +283,10 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
nd->end = end;
}
- printk(KERN_INFO "SRAT: Node %u PXM %u %Lx-%Lx\n", node, pxm,
- nd->start, nd->end);
- e820_register_active_regions(node, nd->start >> PAGE_SHIFT,
- nd->end >> PAGE_SHIFT);
+ printk(KERN_INFO "SRAT: Node %u PXM %u %lx-%lx\n", node, pxm,
+ start, end);
+ e820_register_active_regions(node, start >> PAGE_SHIFT,
+ end >> PAGE_SHIFT);
push_node_boundaries(node, nd->start >> PAGE_SHIFT,
nd->end >> PAGE_SHIFT);
@@ -294,6 +298,11 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
if ((nd->start | nd->end) == 0)
node_clear(node, nodes_parsed);
}
+
+ node_memblk_range[num_node_memblks].start = start;
+ node_memblk_range[num_node_memblks].end = end;
+ memblk_nodeid[num_node_memblks] = node;
+ num_node_memblks++;
}
/* Sanity check to catch more bad SRATs (they are amazingly common).
@@ -364,7 +373,8 @@ int __init acpi_scan_nodes(unsigned long start, unsigned long end)
return -1;
}
- memnode_shift = compute_hash_shift(nodes, MAX_NUMNODES);
+ memnode_shift = compute_hash_shift(node_memblk_range, num_node_memblks,
+ memblk_nodeid);
if (memnode_shift < 0) {
printk(KERN_ERR
"SRAT: No NUMA node hash function found. Contact maintainer\n");
diff --git a/include/asm-x86/numa_64.h b/include/asm-x86/numa_64.h
index 15fe07c..0d37e31 100644
--- a/include/asm-x86/numa_64.h
+++ b/include/asm-x86/numa_64.h
@@ -8,7 +8,8 @@ struct bootnode {
u64 start,end;
};
-extern int compute_hash_shift(struct bootnode *nodes, int numnodes);
+extern int compute_hash_shift(struct bootnode *nodes, int numblks,
+ int *nodeids);
#define ZONE_ALIGN (1UL << (MAX_ORDER+PAGE_SHIFT))
--
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