[deliverable/linux.git] / arch / powerpc / include / asm / cputhreads.h

#ifndef _ASM_POWERPC_CPUTHREADS_H
#define _ASM_POWERPC_CPUTHREADS_H

#include <linux/cpumask.h>

/*
 * Mapping of threads to cores
 *
 * Note: This implementation is limited to a power of 2 number of
 * threads per core and the same number for each core in the system
 * (though it would work if some processors had less threads as long
 * as the CPU numbers are still allocated, just not brought online).
 *
 * However, the API allows for a different implementation in the future
 * if needed, as long as you only use the functions and not the variables
 * directly.
 */

#ifdef CONFIG_SMP
extern int threads_per_core;
extern int threads_per_subcore;
extern int threads_shift;
extern cpumask_t threads_core_mask;
#else
#define threads_per_core	1
#define threads_per_subcore	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(const struct cpumask *threads)
{
	cpumask_t	tmp, res;
	int		i;

	cpumask_clear(&res);
	for (i = 0; i < NR_CPUS; i += threads_per_core) {
		cpumask_shift_left(&tmp, &threads_core_mask, i);
		if (cpumask_intersects(threads, &tmp))
			cpumask_set_cpu(i, &res);
	}
	return res;
}

static inline int cpu_nr_cores(void)
{
	return nr_cpu_ids >> threads_shift;
}

static inline cpumask_t cpu_online_cores_map(void)
{
	return cpu_thread_mask_to_cores(cpu_online_mask);
}

#ifdef CONFIG_SMP
int cpu_core_index_of_thread(int cpu);
int cpu_first_thread_of_core(int core);
#else
static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
static inline int cpu_first_thread_of_core(int core) { return core; }
#endif

static inline int cpu_thread_in_core(int cpu)
{
	return cpu & (threads_per_core - 1);
}

static inline int cpu_thread_in_subcore(int cpu)
{
	return cpu & (threads_per_subcore - 1);
}

static inline int cpu_first_thread_sibling(int cpu)
{
	return cpu & ~(threads_per_core - 1);
}

static inline int cpu_last_thread_sibling(int cpu)
{
	return cpu | (threads_per_core - 1);
}


#endif /* _ASM_POWERPC_CPUTHREADS_H */
Commit	Line	Data
8d089085 BH	1	#ifndef _ASM_POWERPC_CPUTHREADS_H
	2	#define _ASM_POWERPC_CPUTHREADS_H
	3
	4	#include <linux/cpumask.h>
	5
	6	/*
	7	* Mapping of threads to cores
fcce8109 BH	8	*
	9	* Note: This implementation is limited to a power of 2 number of
	10	* threads per core and the same number for each core in the system
	11	* (though it would work if some processors had less threads as long
933b90a9	12	* as the CPU numbers are still allocated, just not brought online).
fcce8109 BH	13	*
	14	* However, the API allows for a different implementation in the future
	15	* if needed, as long as you only use the functions and not the variables
	16	* directly.
8d089085 BH	17	*/
	18
	19	#ifdef CONFIG_SMP
	20	extern int threads_per_core;
5853aef1	21	extern int threads_per_subcore;
8d089085 BH	22	extern int threads_shift;
	23	extern cpumask_t threads_core_mask;
	24	#else
	25	#define threads_per_core 1
5853aef1	26	#define threads_per_subcore 1
8d089085 BH	27	#define threads_shift 0
	28	#define threads_core_mask (CPU_MASK_CPU0)
	29	#endif
	30
	31	/* cpu_thread_mask_to_cores - Return a cpumask of one per cores
	32	* hit by the argument
	33	*
	34	* @threads: a cpumask of threads
	35	*
	36	* This function returns a cpumask which will have one "cpu" (or thread)
	37	* bit set for each core that has at least one thread set in the argument.
	38	*
	39	* This can typically be used for things like IPI for tlb invalidations
	40	* since those need to be done only once per core/TLB
	41	*/
104699c0	42	static inline cpumask_t cpu_thread_mask_to_cores(const struct cpumask *threads)
8d089085 BH	43	{
	44	cpumask_t tmp, res;
	45	int i;
	46
104699c0	47	cpumask_clear(&res);
8d089085	48	for (i = 0; i < NR_CPUS; i += threads_per_core) {
104699c0 KM	49	cpumask_shift_left(&tmp, &threads_core_mask, i);
	50	if (cpumask_intersects(threads, &tmp))
	51	cpumask_set_cpu(i, &res);
8d089085 BH	52	}
	53	return res;
	54	}
	55
	56	static inline int cpu_nr_cores(void)
	57	{
d52356e7	58	return nr_cpu_ids >> threads_shift;
8d089085 BH	59	}
	60
	61	static inline cpumask_t cpu_online_cores_map(void)
	62	{
104699c0	63	return cpu_thread_mask_to_cores(cpu_online_mask);
8d089085 BH	64	}
8d089085 BH	65
99d86705 VS	66	#ifdef CONFIG_SMP
	67	int cpu_core_index_of_thread(int cpu);
	68	int cpu_first_thread_of_core(int core);
	69	#else
	70	static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
	71	static inline int cpu_first_thread_of_core(int core) { return core; }
	72	#endif
8d089085 BH	73
	74	static inline int cpu_thread_in_core(int cpu)
	75	{
	76	return cpu & (threads_per_core - 1);
	77	}
	78
5853aef1 ME	79	static inline int cpu_thread_in_subcore(int cpu)
	80	{
	81	return cpu & (threads_per_subcore - 1);
	82	}
	83
99d86705	84	static inline int cpu_first_thread_sibling(int cpu)
8d089085 BH	85	{
	86	return cpu & ~(threads_per_core - 1);
	87	}
	88
99d86705	89	static inline int cpu_last_thread_sibling(int cpu)
fcce8109 BH	90	{
	91	return cpu \| (threads_per_core - 1);
	92	}
	93
	94
	95
8d089085 BH	96	#endif /* _ASM_POWERPC_CPUTHREADS_H */
8d089085 BH	97