Commit 15863ff3 authored by Vasant Hegde's avatar Vasant Hegde Committed by Benjamin Herrenschmidt
Browse files

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: default avatarVasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: default avatarShivaprasad G Bhat <sbhat@linux.vnet.ibm.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 20212703

arch/powerpc/include/asm/smp.h

+1 −0
Original line number Diff line number Diff line
@@ -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.

 *

arch/powerpc/include/asm/topology.h

+1 −0
Original line number Diff line number Diff line
@@ -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))

arch/powerpc/kernel/smp.c

+15 −0
Original line number Diff line number Diff line
@@ -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)

{

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