tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _ASM_X86_IPI_H
2#define _ASM_X86_IPI_H
3
4#ifdef CONFIG_X86_LOCAL_APIC
5
6/*
7 * Copyright 2004 James Cleverdon, IBM.
8 * Subject to the GNU Public License, v.2
9 *
10 * Generic APIC InterProcessor Interrupt code.
11 *
12 * Moved to include file by James Cleverdon from
13 * arch/x86-64/kernel/smp.c
14 *
15 * Copyrights from kernel/smp.c:
16 *
17 * (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
18 * (c) 1998-99, 2000 Ingo Molnar <mingo@redhat.com>
19 * (c) 2002,2003 Andi Kleen, SuSE Labs.
20 * Subject to the GNU Public License, v.2
21 */
22
23#include <asm/hw_irq.h>
24#include <asm/apic.h>
25#include <asm/smp.h>
26
27/*
28 * the following functions deal with sending IPIs between CPUs.
29 *
30 * We use 'broadcast', CPU->CPU IPIs and self-IPIs too.
31 */
32
33static inline unsigned int __prepare_ICR(unsigned int shortcut, int vector,
34 unsigned int dest)
35{
36 unsigned int icr = shortcut | dest;
37
38 switch (vector) {
39 default:
40 icr |= APIC_DM_FIXED | vector;
41 break;
42 case NMI_VECTOR:
43 icr |= APIC_DM_NMI;
44 break;
45 }
46 return icr;
47}
48
49static inline int __prepare_ICR2(unsigned int mask)
50{
51 return SET_APIC_DEST_FIELD(mask);
52}
53
54static inline void __xapic_wait_icr_idle(void)
55{
56 while (native_apic_mem_read(APIC_ICR) & APIC_ICR_BUSY)
57 cpu_relax();
58}
59
60static inline void
61__default_send_IPI_shortcut(unsigned int shortcut, int vector, unsigned int dest)
62{
63 /*
64 * Subtle. In the case of the 'never do double writes' workaround
65 * we have to lock out interrupts to be safe. As we don't care
66 * of the value read we use an atomic rmw access to avoid costly
67 * cli/sti. Otherwise we use an even cheaper single atomic write
68 * to the APIC.
69 */
70 unsigned int cfg;
71
72 /*
73 * Wait for idle.
74 */
75 __xapic_wait_icr_idle();
76
77 /*
78 * No need to touch the target chip field
79 */
80 cfg = __prepare_ICR(shortcut, vector, dest);
81
82 /*
83 * Send the IPI. The write to APIC_ICR fires this off.
84 */
85 native_apic_mem_write(APIC_ICR, cfg);
86}
87
88/*
89 * This is used to send an IPI with no shorthand notation (the destination is
90 * specified in bits 56 to 63 of the ICR).
91 */
92static inline void
93 __default_send_IPI_dest_field(unsigned int mask, int vector, unsigned int dest)
94{
95 unsigned long cfg;
96
97 /*
98 * Wait for idle.
99 */
100 if (unlikely(vector == NMI_VECTOR))
101 safe_apic_wait_icr_idle();
102 else
103 __xapic_wait_icr_idle();
104
105 /*
106 * prepare target chip field
107 */
108 cfg = __prepare_ICR2(mask);
109 native_apic_mem_write(APIC_ICR2, cfg);
110
111 /*
112 * program the ICR
113 */
114 cfg = __prepare_ICR(0, vector, dest);
115
116 /*
117 * Send the IPI. The write to APIC_ICR fires this off.
118 */
119 native_apic_mem_write(APIC_ICR, cfg);
120}
121
122extern void default_send_IPI_mask_sequence_phys(const struct cpumask *mask,
123 int vector);
124extern void default_send_IPI_mask_allbutself_phys(const struct cpumask *mask,
125 int vector);
126
127/* Avoid include hell */
128#define NMI_VECTOR 0x02
129
130extern int no_broadcast;
131
132static inline void __default_local_send_IPI_allbutself(int vector)
133{
134 if (no_broadcast || vector == NMI_VECTOR)
135 apic->send_IPI_mask_allbutself(cpu_online_mask, vector);
136 else
137 __default_send_IPI_shortcut(APIC_DEST_ALLBUT, vector, apic->dest_logical);
138}
139
140static inline void __default_local_send_IPI_all(int vector)
141{
142 if (no_broadcast || vector == NMI_VECTOR)
143 apic->send_IPI_mask(cpu_online_mask, vector);
144 else
145 __default_send_IPI_shortcut(APIC_DEST_ALLINC, vector, apic->dest_logical);
146}
147
148#ifdef CONFIG_X86_32
149extern void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
150 int vector);
151extern void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask,
152 int vector);
153extern void default_send_IPI_mask_logical(const struct cpumask *mask,
154 int vector);
155extern void default_send_IPI_allbutself(int vector);
156extern void default_send_IPI_all(int vector);
157extern void default_send_IPI_self(int vector);
158#endif
159
160#endif
161
162#endif /* _ASM_X86_IPI_H */