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 */
26 void init_messaging(void);
27
28 /* Set up this tile to support receiving device interrupts and IPIs. */
29 void init_per_tile_IRQs(void);
30
31 /* Send a message to processors specified in mask */
32 void send_IPI_many(const struct cpumask *mask, int tag);
33
34 /* Send a message to all but the sending processor */
35 void send_IPI_allbutself(int tag);
36
37 /* Send a message to a specific processor */
38 void send_IPI_single(int dest, int tag);
39
40 /* Process an IPI message */
41 void evaluate_message(int tag);
42
43 /* Boot a secondary cpu */
44 void online_secondary(void);
45
46 /* Topology of the supervisor tile grid, and coordinates of boot processor */
47 extern 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. */
cpu_x(int cpu)54 static inline int cpu_x(int cpu)
55 {
56 return cpu % smp_width;
57 }
cpu_y(int cpu)58 static inline int cpu_y(int cpu)
59 {
60 return cpu / smp_width;
61 }
xy_to_cpu(int x,int y)62 static 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 #define MSG_TAG_IRQ_WORK 5
73
74 /* Hook for the generic smp_call_function_many() routine. */
arch_send_call_function_ipi_mask(struct cpumask * mask)75 static inline void arch_send_call_function_ipi_mask(struct cpumask *mask)
76 {
77 send_IPI_many(mask, MSG_TAG_CALL_FUNCTION_MANY);
78 }
79
80 /* Hook for the generic smp_call_function_single() routine. */
arch_send_call_function_single_ipi(int cpu)81 static inline void arch_send_call_function_single_ipi(int cpu)
82 {
83 send_IPI_single(cpu, MSG_TAG_CALL_FUNCTION_SINGLE);
84 }
85
86 /* Print out the boot string describing which cpus were disabled. */
87 void print_disabled_cpus(void);
88
89 #else /* !CONFIG_SMP */
90
91 #define smp_master_cpu 0
92 #define smp_height 1
93 #define smp_width 1
94 #define cpu_x(cpu) 0
95 #define cpu_y(cpu) 0
96 #define xy_to_cpu(x, y) 0
97
98 #endif /* !CONFIG_SMP */
99
100
101 /* Which cpus may be used as the lotar in a page table entry. */
102 extern struct cpumask cpu_lotar_map;
103 #define cpu_is_valid_lotar(cpu) cpumask_test_cpu((cpu), &cpu_lotar_map)
104
105 /* Which processors are used for hash-for-home mapping */
106 extern struct cpumask hash_for_home_map;
107
108 /* Which cpus can have their cache flushed by hv_flush_remote(). */
109 extern struct cpumask cpu_cacheable_map;
110 #define cpu_cacheable(cpu) cpumask_test_cpu((cpu), &cpu_cacheable_map)
111
112 /* Convert an HV_LOTAR value into a cpu. */
hv_lotar_to_cpu(HV_LOTAR lotar)113 static inline int hv_lotar_to_cpu(HV_LOTAR lotar)
114 {
115 return HV_LOTAR_X(lotar) + (HV_LOTAR_Y(lotar) * smp_width);
116 }
117
118 /*
119 * Extension of <linux/cpumask.h> functionality when you just want
120 * to express a mask or suppression or inclusion region without
121 * being too concerned about exactly which cpus are valid in that region.
122 */
123 int bitmap_parselist_crop(const char *bp, unsigned long *maskp, int nmaskbits);
124
125 #define cpulist_parse_crop(buf, dst) \
126 __cpulist_parse_crop((buf), (dst), NR_CPUS)
__cpulist_parse_crop(const char * buf,struct cpumask * dstp,int nbits)127 static inline int __cpulist_parse_crop(const char *buf, struct cpumask *dstp,
128 int nbits)
129 {
130 return bitmap_parselist_crop(buf, cpumask_bits(dstp), nbits);
131 }
132
133 /* Initialize the IPI subsystem. */
134 void ipi_init(void);
135
136 /* Function for start-cpu message to cause us to jump to. */
137 extern unsigned long start_cpu_function_addr;
138
139 #endif /* _ASM_TILE_SMP_H */
140