alistair23-linux/arch/powerpc/include/asm/cputhreads.h
Stephen Rothwell b8b572e101 powerpc: Move include files to arch/powerpc/include/asm
from include/asm-powerpc.  This is the result of a

mkdir arch/powerpc/include/asm
git mv include/asm-powerpc/* arch/powerpc/include/asm

Followed by a few documentation/comment fixups and a couple of places
where <asm-powepc/...> was being used explicitly.  Of the latter only
one was outside the arch code and it is a driver only built for powerpc.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2008-08-04 12:02:00 +10:00

72 lines
1.5 KiB
C

#ifndef _ASM_POWERPC_CPUTHREADS_H
#define _ASM_POWERPC_CPUTHREADS_H
#include <linux/cpumask.h>
/*
* Mapping of threads to cores
*/
#ifdef CONFIG_SMP
extern int threads_per_core;
extern int threads_shift;
extern cpumask_t threads_core_mask;
#else
#define threads_per_core 1
#define threads_shift 0
#define threads_core_mask (CPU_MASK_CPU0)
#endif
/* cpu_thread_mask_to_cores - Return a cpumask of one per cores
* hit by the argument
*
* @threads: a cpumask of threads
*
* This function returns a cpumask which will have one "cpu" (or thread)
* bit set for each core that has at least one thread set in the argument.
*
* This can typically be used for things like IPI for tlb invalidations
* since those need to be done only once per core/TLB
*/
static inline cpumask_t cpu_thread_mask_to_cores(cpumask_t threads)
{
cpumask_t tmp, res;
int i;
res = CPU_MASK_NONE;
for (i = 0; i < NR_CPUS; i += threads_per_core) {
cpus_shift_left(tmp, threads_core_mask, i);
if (cpus_intersects(threads, tmp))
cpu_set(i, res);
}
return res;
}
static inline int cpu_nr_cores(void)
{
return NR_CPUS >> threads_shift;
}
static inline cpumask_t cpu_online_cores_map(void)
{
return cpu_thread_mask_to_cores(cpu_online_map);
}
static inline int cpu_thread_to_core(int cpu)
{
return cpu >> threads_shift;
}
static inline int cpu_thread_in_core(int cpu)
{
return cpu & (threads_per_core - 1);
}
static inline int cpu_first_thread_in_core(int cpu)
{
return cpu & ~(threads_per_core - 1);
}
#endif /* _ASM_POWERPC_CPUTHREADS_H */