1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Definitions specific to SMP platforms.
4  *
5  * Copyright (C) 2013 ARM Ltd.
6  */
7 
8 #ifndef __ASM_SMP_PLAT_H
9 #define __ASM_SMP_PLAT_H
10 
11 #include <linux/cpumask.h>
12 
13 #include <asm/types.h>
14 
15 struct mpidr_hash {
16 	u64	mask;
17 	u32	shift_aff[4];
18 	u32	bits;
19 };
20 
21 extern struct mpidr_hash mpidr_hash;
22 
mpidr_hash_size(void)23 static inline u32 mpidr_hash_size(void)
24 {
25 	return 1 << mpidr_hash.bits;
26 }
27 
28 /*
29  * Retrieve logical cpu index corresponding to a given MPIDR.Aff*
30  *  - mpidr: MPIDR.Aff* bits to be used for the look-up
31  *
32  * Returns the cpu logical index or -EINVAL on look-up error
33  */
get_logical_index(u64 mpidr)34 static inline int get_logical_index(u64 mpidr)
35 {
36 	int cpu;
37 	for (cpu = 0; cpu < nr_cpu_ids; cpu++)
38 		if (cpu_logical_map(cpu) == mpidr)
39 			return cpu;
40 	return -EINVAL;
41 }
42 
43 #endif /* __ASM_SMP_PLAT_H */
44