diff options
| 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/mm/numa_64.c | |
| parent | 4e76f4e67a106ed827ca721b4c8b622047cd2f6d (diff) | |
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/mm/numa_64.c')
| -rw-r--r-- | arch/x86/mm/numa_64.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c index 7762a517d69..cc390f3a1bd 100644 --- a/arch/x86/mm/numa_64.c +++ b/arch/x86/mm/numa_64.c @@ -324,6 +324,24 @@ static int __init setup_physnodes(unsigned long start, unsigned long end, return ret; } +static void __init fake_physnodes(int acpi, int amd, int nr_nodes) +{ + int i; + + BUG_ON(acpi && amd); +#ifdef CONFIG_ACPI_NUMA + if (acpi) + acpi_fake_nodes(nodes, nr_nodes); +#endif +#ifdef CONFIG_AMD_NUMA + if (amd) + amd_fake_nodes(nodes, nr_nodes); +#endif + if (!acpi && !amd) + for (i = 0; i < nr_cpu_ids; i++) + numa_set_node(i, 0); +} + /* * Setups up nid to range from addr to addr + size. If the end * boundary is greater than max_addr, then max_addr is used instead. @@ -595,7 +613,7 @@ static int __init numa_emulation(unsigned long start_pfn, nodes[i].end >> PAGE_SHIFT); setup_node_bootmem(i, nodes[i].start, nodes[i].end); } - acpi_fake_nodes(nodes, num_nodes); + fake_physnodes(acpi, amd, num_nodes); numa_init_array(); return 0; } |