[mirror_ubuntu-bionic-kernel.git] / arch / arm64 / include / asm / smp_plat.h

/*
 * Definitions specific to SMP platforms.
 *
 * Copyright (C) 2013 ARM Ltd.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __ASM_SMP_PLAT_H
#define __ASM_SMP_PLAT_H

#include <linux/cpumask.h>

#include <asm/types.h>

struct mpidr_hash {
	u64	mask;
	u32	shift_aff[4];
	u32	bits;
};

extern struct mpidr_hash mpidr_hash;

static inline u32 mpidr_hash_size(void)
{
	return 1 << mpidr_hash.bits;
}

/*
 * Logical CPU mapping.
 */
extern u64 __cpu_logical_map[NR_CPUS];
#define cpu_logical_map(cpu)    __cpu_logical_map[cpu]
/*
 * Retrieve logical cpu index corresponding to a given MPIDR.Aff*
 *  - mpidr: MPIDR.Aff* bits to be used for the look-up
 *
 * Returns the cpu logical index or -EINVAL on look-up error
 */
static inline int get_logical_index(u64 mpidr)
{
	int cpu;
	for (cpu = 0; cpu < nr_cpu_ids; cpu++)
		if (cpu_logical_map(cpu) == mpidr)
			return cpu;
	return -EINVAL;
}

#endif /* __ASM_SMP_PLAT_H */
Commit	Line	Data
4c7aa002 JM	1	/*
	2	* Definitions specific to SMP platforms.
	3	*
	4	* Copyright (C) 2013 ARM Ltd.
	5	*
	6	* This program is free software: you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	17	*/
	18
	19	#ifndef __ASM_SMP_PLAT_H
	20	#define __ASM_SMP_PLAT_H
	21
6ee3c78c MR	22	#include <linux/cpumask.h>
6ee3c78c MR	23
4c7aa002 JM	24	#include <asm/types.h>
4c7aa002 JM	25
976d7d3f LP	26	struct mpidr_hash {
	27	u64 mask;
	28	u32 shift_aff[4];
	29	u32 bits;
	30	};
	31
	32	extern struct mpidr_hash mpidr_hash;
	33
	34	static inline u32 mpidr_hash_size(void)
	35	{
	36	return 1 << mpidr_hash.bits;
	37	}
	38
4c7aa002 JM	39	/*
	40	* Logical CPU mapping.
	41	*/
	42	extern u64 __cpu_logical_map[NR_CPUS];
	43	#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
6ee3c78c MR	44	/*
	45	* Retrieve logical cpu index corresponding to a given MPIDR.Aff*
	46	* - mpidr: MPIDR.Aff* bits to be used for the look-up
	47	*
	48	* Returns the cpu logical index or -EINVAL on look-up error
	49	*/
	50	static inline int get_logical_index(u64 mpidr)
	51	{
	52	int cpu;
	53	for (cpu = 0; cpu < nr_cpu_ids; cpu++)
	54	if (cpu_logical_map(cpu) == mpidr)
	55	return cpu;
	56	return -EINVAL;
	57	}
4c7aa002 JM	58
4c7aa002 JM	59	#endif /* __ASM_SMP_PLAT_H */