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| author | David Rientjes <rientjes@google.com> | 2010-12-22 17:23:51 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-12-23 15:27:14 -0800 |
| commit | f51bf3073a145a5b3263fd882c52d6ec04b687da (patch) | |
| tree | c9e07ebc957cbb768c4e750b1a67640e0ad81118 /arch/x86/include/asm/amd_nb.h | |
| parent | 4e76f4e67a106ed827ca721b4c8b622047cd2f6d (diff) | |
| download | linux-0-day-f51bf3073a145a5b3263fd882c52d6ec04b687da.tar.gz linux-0-day-f51bf3073a145a5b3263fd882c52d6ec04b687da.tar.xz | |
x86, numa: Fake apicid and pxm mappings for NUMA emulation
This patch adds the equivalent of acpi_fake_nodes() for AMD Northbridge
platforms. The goal is to fake the apicid-to-node mappings for NUMA
emulation so the physical topology of the machine is correctly maintained
within the kernel.
This change also fakes proximity domains for both ACPI and k8 code so the
physical distance between emulated nodes is maintained via
node_distance(). This exports the correct distances via
/sys/devices/system/node/.../distance based on the underlying topology.
A new helper function, fake_physnodes(), is introduced to correctly
invoke the correct NUMA code to fake these two mappings based on the
system type. If there is no underlying NUMA configuration, all cpus are
mapped to node 0 for local distance.
Since acpi_fake_nodes() is no longer called with CONFIG_ACPI_NUMA, it's
prototype can be removed from the header file for such a configuration.
Signed-off-by: David Rientjes <rientjes@google.com>
LKML-Reference: <alpine.DEB.2.00.1012221701360.3701@chino.kir.corp.google.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include/asm/amd_nb.h')
| -rw-r--r-- | arch/x86/include/asm/amd_nb.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h index 9c16cde63f046..8f6192c1592cd 100644 --- a/arch/x86/include/asm/amd_nb.h +++ b/arch/x86/include/asm/amd_nb.h @@ -13,6 +13,7 @@ extern int amd_numa_init(unsigned long start_pfn, unsigned long end_pfn); extern int amd_scan_nodes(void); #ifdef CONFIG_NUMA_EMU +extern void amd_fake_nodes(const struct bootnode *nodes, int nr_nodes); extern int amd_get_nodes(struct bootnode *nodes); #endif |