summaryrefslogtreecommitdiff
path: root/arch/arm/include/asm/smp_plat.h
blob: e789832027374278b7c28cecf0f9562924c6e877 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
/*
 * ARM specific SMP header, this contains our implementation
 * details.
 */
#ifndef __ASMARM_SMP_PLAT_H
#define __ASMARM_SMP_PLAT_H

#include <linux/cpumask.h>
#include <linux/err.h>

#include <asm/cputype.h>

/*
 * Return true if we are running on a SMP platform
 */
static inline bool is_smp(void)
{
#ifndef CONFIG_SMP
	return false;
#elif defined(CONFIG_SMP_ON_UP)
	extern unsigned int smp_on_up;
	return !!smp_on_up;
#else
	return true;
#endif
}

/* all SMP configurations have the extended CPUID registers */
static inline int tlb_ops_need_broadcast(void)
{
	if (!is_smp())
		return 0;

	return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 2;
}

#if !defined(CONFIG_SMP) || __LINUX_ARM_ARCH__ >= 7
#define cache_ops_need_broadcast()	0
#else
static inline int cache_ops_need_broadcast(void)
{
	if (!is_smp())
		return 0;

	return ((read_cpuid_ext(CPUID_EXT_MMFR3) >> 12) & 0xf) < 1;
}
#endif

/*
 * Logical CPU mapping.
 */
extern u32 __cpu_logical_map[];
#define cpu_logical_map(cpu)	__cpu_logical_map[cpu]
/*
 * Retrieve logical cpu index corresponding to a given MPIDR[23:0]
 *  - mpidr: MPIDR[23:0] to be used for the look-up
 *
 * Returns the cpu logical index or -EINVAL on look-up error
 */
static inline int get_logical_index(u32 mpidr)
{
	int cpu;
	for (cpu = 0; cpu < nr_cpu_ids; cpu++)
		if (cpu_logical_map(cpu) == mpidr)
			return cpu;
	return -EINVAL;
}

#endif