tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 */
14
15#ifndef _ASM_TILE_SMP_H
16#define _ASM_TILE_SMP_H
17
18#ifdef CONFIG_SMP
19
20#include <asm/processor.h>
21#include <linux/cpumask.h>
22#include <linux/irqreturn.h>
23#include <hv/hypervisor.h>
24
25/* Set up this tile to support receiving hypervisor messages */
26void init_messaging(void);
27
28/* Set up this tile to support receiving device interrupts and IPIs. */
29void init_per_tile_IRQs(void);
30
31/* Send a message to processors specified in mask */
32void send_IPI_many(const struct cpumask *mask, int tag);
33
34/* Send a message to all but the sending processor */
35void send_IPI_allbutself(int tag);
36
37/* Send a message to a specific processor */
38void send_IPI_single(int dest, int tag);
39
40/* Process an IPI message */
41void evaluate_message(int tag);
42
43/* Boot a secondary cpu */
44void online_secondary(void);
45
46/* Topology of the supervisor tile grid, and coordinates of boot processor */
47extern HV_Topology smp_topology;
48
49/* Accessors for grid size */
50#define smp_height (smp_topology.height)
51#define smp_width (smp_topology.width)
52
53/* Convenience functions for converting cpu <-> coords. */
54static inline int cpu_x(int cpu)
55{
56 return cpu % smp_width;
57}
58static inline int cpu_y(int cpu)
59{
60 return cpu / smp_width;
61}
62static inline int xy_to_cpu(int x, int y)
63{
64 return y * smp_width + x;
65}
66
67/* Hypervisor message tags sent via the tile send_IPI*() routines. */
68#define MSG_TAG_START_CPU 1
69#define MSG_TAG_STOP_CPU 2
70#define MSG_TAG_CALL_FUNCTION_MANY 3
71#define MSG_TAG_CALL_FUNCTION_SINGLE 4
72
73/* Hook for the generic smp_call_function_many() routine. */
74static inline void arch_send_call_function_ipi_mask(struct cpumask *mask)
75{
76 send_IPI_many(mask, MSG_TAG_CALL_FUNCTION_MANY);
77}
78
79/* Hook for the generic smp_call_function_single() routine. */
80static inline void arch_send_call_function_single_ipi(int cpu)
81{
82 send_IPI_single(cpu, MSG_TAG_CALL_FUNCTION_SINGLE);
83}
84
85/* Print out the boot string describing which cpus were disabled. */
86void print_disabled_cpus(void);
87
88#else /* !CONFIG_SMP */
89
90#define smp_master_cpu 0
91#define smp_height 1
92#define smp_width 1
93#define cpu_x(cpu) 0
94#define cpu_y(cpu) 0
95#define xy_to_cpu(x, y) 0
96
97#endif /* !CONFIG_SMP */
98
99
100/* Which cpus may be used as the lotar in a page table entry. */
101extern struct cpumask cpu_lotar_map;
102#define cpu_is_valid_lotar(cpu) cpumask_test_cpu((cpu), &cpu_lotar_map)
103
104/* Which processors are used for hash-for-home mapping */
105extern struct cpumask hash_for_home_map;
106
107/* Which cpus can have their cache flushed by hv_flush_remote(). */
108extern struct cpumask cpu_cacheable_map;
109#define cpu_cacheable(cpu) cpumask_test_cpu((cpu), &cpu_cacheable_map)
110
111/* Convert an HV_LOTAR value into a cpu. */
112static inline int hv_lotar_to_cpu(HV_LOTAR lotar)
113{
114 return HV_LOTAR_X(lotar) + (HV_LOTAR_Y(lotar) * smp_width);
115}
116
117/*
118 * Extension of <linux/cpumask.h> functionality when you just want
119 * to express a mask or suppression or inclusion region without
120 * being too concerned about exactly which cpus are valid in that region.
121 */
122int bitmap_parselist_crop(const char *bp, unsigned long *maskp, int nmaskbits);
123
124#define cpulist_parse_crop(buf, dst) \
125 __cpulist_parse_crop((buf), (dst), NR_CPUS)
126static inline int __cpulist_parse_crop(const char *buf, struct cpumask *dstp,
127 int nbits)
128{
129 return bitmap_parselist_crop(buf, cpumask_bits(dstp), nbits);
130}
131
132/* Initialize the IPI subsystem. */
133void ipi_init(void);
134
135/* Function for start-cpu message to cause us to jump to. */
136extern unsigned long start_cpu_function_addr;
137
138#endif /* _ASM_TILE_SMP_H */