aboutsummaryrefslogtreecommitdiff
path: root/include/asm-x86_64
diff options
context:
space:
mode:
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 /include/asm-x86_64
parent3af044e0f832cfa3fcdce14dc30678b79dd36995 (diff)
downloadlinux-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>
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r--include/asm-x86_64/acpi.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/asm-x86_64/acpi.h b/include/asm-x86_64/acpi.h
index a29f05087a3..1da8f49c0fe 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*/