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| author | Vasant Hegde <hegdevasant@linux.vnet.ibm.com> | 2013-08-12 17:35:57 +0530 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-08-14 15:33:17 +1000 |
| commit | 15863ff3b8dae4cacd831ce10aa34992e9ababb0 (patch) | |
| tree | b061c136ecd6204ce9084f4e4d4232b5404e8b39 /arch/powerpc/kernel/smp.c | |
| parent | 202127031a14f244c15ae4434993d36bd10a439c (diff) | |
| download | linux-15863ff3b8dae4cacd831ce10aa34992e9ababb0.tar.gz | |
powerpc: Make chip-id information available to userspace
So far "/sys/devices/system/cpu/cpuX/topology/physical_package_id"
was always default (-1) on ppc64 architecture.
Now, some systems have an ibm,chip-id property in the cpu nodes in
the device tree. On these systems, we now use this information to
display physical_package_id.
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Shivaprasad G Bhat <sbhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/smp.c')
| -rw-r--r-- | arch/powerpc/kernel/smp.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c index 009900dd8f25..d9d8bb0f4454 100644 --- a/arch/powerpc/kernel/smp.c +++ b/arch/powerpc/kernel/smp.c @@ -596,6 +596,21 @@ out: return id; } +/* Return the value of the chip-id property corresponding + * to the given logical cpu. + */ +int cpu_to_chip_id(int cpu) +{ + struct device_node *np; + + np = of_get_cpu_node(cpu, NULL); + if (!np) + return -1; + + of_node_put(np); + return of_get_ibm_chip_id(np); +} + /* Helper routines for cpu to core mapping */ int cpu_core_index_of_thread(int cpu) { |