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authorDavid Rientjes <rientjes@google.com>2007-07-21 17:10:32 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-21 18:37:10 -0700
commit3484d79813707bb6045773953a809abba443dc20 (patch)
treea986c674698face8fc51132a1feeac53fa7946a2
parent3af044e0f832cfa3fcdce14dc30678b79dd36995 (diff)
downloadop-kernel-dev-3484d79813707bb6045773953a809abba443dc20.zip
op-kernel-dev-3484d79813707bb6045773953a809abba443dc20.tar.gz
x86_64: fake pxm-to-node mapping for fake numa
For NUMA emulation, our SLIT should represent the true NUMA topology of the system but our proximity domain to node ID mapping needs to reflect the emulated state. When NUMA emulation has successfully setup fake nodes on the system, a new function, acpi_fake_nodes() is called. This function determines the proximity domain (_PXM) for each true node found on the system. It then finds which emulated nodes have been allocated on this true node as determined by its starting address. The node ID to PXM mapping is changed so that each fake node ID points to the PXM of the true node that it is located on. If the machine failed to register a SLIT, then we assume there is no special requirement for emulated node affinity so we use the default LOCAL_DISTANCE, which is newly exported to this code, as our measurement if the emulated nodes appear in the same PXM. Otherwise, we use REMOTE_DISTANCE. PXM_INVAL and NID_INVAL are also exported to the ACPI header file so that we can compare node_to_pxm() results in generic code (in this case, the SRAT code). Cc: Len Brown <lenb@kernel.org> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/x86_64/mm/numa.c1
-rw-r--r--arch/x86_64/mm/srat.c76
-rw-r--r--drivers/acpi/numa.c11
-rw-r--r--include/acpi/acpi_numa.h1
-rw-r--r--include/asm-x86_64/acpi.h11
-rw-r--r--include/linux/acpi.h3
6 files changed, 96 insertions, 7 deletions
diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c
index 5154894..30bf804 100644
--- a/arch/x86_64/mm/numa.c
+++ b/arch/x86_64/mm/numa.c
@@ -484,6 +484,7 @@ out:
nodes[i].end >> PAGE_SHIFT);
setup_node_bootmem(i, nodes[i].start, nodes[i].end);
}
+ acpi_fake_nodes(nodes, num_nodes);
numa_init_array();
return 0;
}
diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c
index 0e0725d..7ac8ff3 100644
--- a/arch/x86_64/mm/srat.c
+++ b/arch/x86_64/mm/srat.c
@@ -350,7 +350,7 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
/* Sanity check to catch more bad SRATs (they are amazingly common).
Make sure the PXMs cover all memory. */
-static int nodes_cover_memory(void)
+static int __init nodes_cover_memory(const struct bootnode *nodes)
{
int i;
unsigned long pxmram, e820ram;
@@ -406,7 +406,7 @@ int __init acpi_scan_nodes(unsigned long start, unsigned long end)
}
}
- if (!nodes_cover_memory()) {
+ if (!nodes_cover_memory(nodes)) {
bad_srat();
return -1;
}
@@ -440,6 +440,75 @@ int __init acpi_scan_nodes(unsigned long start, unsigned long end)
return 0;
}
+#ifdef CONFIG_NUMA_EMU
+static int __init find_node_by_addr(unsigned long addr)
+{
+ int ret = NUMA_NO_NODE;
+ int i;
+
+ for_each_node_mask(i, nodes_parsed) {
+ /*
+ * Find the real node that this emulated node appears on. For
+ * the sake of simplicity, we only use a real node's starting
+ * address to determine which emulated node it appears on.
+ */
+ if (addr >= nodes[i].start && addr < nodes[i].end) {
+ ret = i;
+ break;
+ }
+ }
+ return i;
+}
+
+/*
+ * In NUMA emulation, we need to setup proximity domain (_PXM) to node ID
+ * mappings that respect the real ACPI topology but reflect our emulated
+ * environment. For each emulated node, we find which real node it appears on
+ * and create PXM to NID mappings for those fake nodes which mirror that
+ * locality. SLIT will now represent the correct distances between emulated
+ * nodes as a result of the real topology.
+ */
+void __init acpi_fake_nodes(const struct bootnode *fake_nodes, int num_nodes)
+{
+ int i;
+ int fake_node_to_pxm_map[MAX_NUMNODES] = {
+ [0 ... MAX_NUMNODES-1] = PXM_INVAL
+ };
+
+ printk(KERN_INFO "Faking PXM affinity for fake nodes on real "
+ "topology.\n");
+ for (i = 0; i < num_nodes; i++) {
+ int nid, pxm;
+
+ nid = find_node_by_addr(fake_nodes[i].start);
+ if (nid == NUMA_NO_NODE)
+ continue;
+ pxm = node_to_pxm(nid);
+ if (pxm == PXM_INVAL)
+ continue;
+ fake_node_to_pxm_map[i] = pxm;
+ }
+ for (i = 0; i < num_nodes; i++)
+ __acpi_map_pxm_to_node(fake_node_to_pxm_map[i], i);
+
+ nodes_clear(nodes_parsed);
+ for (i = 0; i < num_nodes; i++)
+ if (fake_nodes[i].start != fake_nodes[i].end)
+ node_set(i, nodes_parsed);
+ WARN_ON(!nodes_cover_memory(fake_nodes));
+}
+
+static int null_slit_node_compare(int a, int b)
+{
+ return node_to_pxm(a) == node_to_pxm(b);
+}
+#else
+static int null_slit_node_compare(int a, int b)
+{
+ return a == b;
+}
+#endif /* CONFIG_NUMA_EMU */
+
void __init srat_reserve_add_area(int nodeid)
{
if (found_add_area && nodes_add[nodeid].end) {
@@ -464,7 +533,8 @@ int __node_distance(int a, int b)
int index;
if (!acpi_slit)
- return a == b ? LOCAL_DISTANCE : REMOTE_DISTANCE;
+ return null_slit_node_compare(a, b) ? LOCAL_DISTANCE :
+ REMOTE_DISTANCE;
index = acpi_slit->locality_count * node_to_pxm(a);
return acpi_slit->entry[index + node_to_pxm(b)];
}
diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index 6c44b52..ab04d84 100644
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -36,8 +36,6 @@
ACPI_MODULE_NAME("numa");
static nodemask_t nodes_found_map = NODE_MASK_NONE;
-#define PXM_INVAL -1
-#define NID_INVAL -1
/* maps to convert between proximity domain and logical node ID */
static int __cpuinitdata pxm_to_node_map[MAX_PXM_DOMAINS]
@@ -59,6 +57,12 @@ int node_to_pxm(int node)
return node_to_pxm_map[node];
}
+void __acpi_map_pxm_to_node(int pxm, int node)
+{
+ pxm_to_node_map[pxm] = node;
+ node_to_pxm_map[node] = pxm;
+}
+
int acpi_map_pxm_to_node(int pxm)
{
int node = pxm_to_node_map[pxm];
@@ -67,8 +71,7 @@ int acpi_map_pxm_to_node(int pxm)
if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
return NID_INVAL;
node = first_unset_node(nodes_found_map);
- pxm_to_node_map[pxm] = node;
- node_to_pxm_map[node] = pxm;
+ __acpi_map_pxm_to_node(pxm, node);
node_set(node, nodes_found_map);
}
diff --git a/include/acpi/acpi_numa.h b/include/acpi/acpi_numa.h
index e2fcee2..62c5ee4 100644
--- a/include/acpi/acpi_numa.h
+++ b/include/acpi/acpi_numa.h
@@ -13,6 +13,7 @@
extern int pxm_to_node(int);
extern int node_to_pxm(int);
+extern void __acpi_map_pxm_to_node(int, int);
extern int acpi_map_pxm_to_node(int);
extern void __cpuinit acpi_unmap_pxm_to_node(int);
diff --git a/include/asm-x86_64/acpi.h b/include/asm-x86_64/acpi.h
index a29f050..1da8f49 100644
--- a/include/asm-x86_64/acpi.h
+++ b/include/asm-x86_64/acpi.h
@@ -29,6 +29,7 @@
#ifdef __KERNEL__
#include <acpi/pdc_intel.h>
+#include <asm/numa.h>
#define COMPILER_DEPENDENT_INT64 long long
#define COMPILER_DEPENDENT_UINT64 unsigned long long
@@ -141,6 +142,16 @@ extern int acpi_pci_disabled;
extern int acpi_skip_timer_override;
extern int acpi_use_timer_override;
+#ifdef CONFIG_ACPI_NUMA
+extern void __init acpi_fake_nodes(const struct bootnode *fake_nodes,
+ int num_nodes);
+#else
+static inline void acpi_fake_nodes(const struct bootnode *fake_nodes,
+ int num_nodes)
+{
+}
+#endif
+
#endif /*__KERNEL__*/
#endif /*_ASM_ACPI_H*/
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index e88b62e..d5680cd 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -231,6 +231,9 @@ extern int acpi_paddr_to_node(u64 start_addr, u64 size);
extern int pnpacpi_disabled;
+#define PXM_INVAL (-1)
+#define NID_INVAL (-1)
+
#else /* CONFIG_ACPI */
static inline int acpi_boot_init(void)
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