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powerpc: Make chip-id information available to userspace

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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>
This commit is contained in:
Vasant Hegde 2013-08-12 17:35:57 +05:30 committed by Benjamin Herrenschmidt
parent 202127031a
commit 15863ff3b8
3 changed files with 17 additions and 0 deletions
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1
arch/powerpc/include/asm/smp.h
View File

@ -112,6 +112,7 @@ static inline struct cpumask *cpu_core_mask(int cpu)
}
extern int cpu_to_core_id(int cpu);
extern int cpu_to_chip_id(int cpu);
/* Since OpenPIC has only 4 IPIs, we use slightly different message numbers.
*

1
arch/powerpc/include/asm/topology.h
View File

@ -96,6 +96,7 @@ static inline int prrn_is_enabled(void)
#ifdef CONFIG_PPC64
#include <asm/smp.h>
#define topology_physical_package_id(cpu) (cpu_to_chip_id(cpu))
#define topology_thread_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu))
#define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu))
#define topology_core_id(cpu) (cpu_to_core_id(cpu))

15
arch/powerpc/kernel/smp.c
View File

@ -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)
{