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
__prepare_ICR(unsigned int shortcut,int vector,unsigned int dest)33 static 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
__prepare_ICR2(unsigned int mask)49 static inline int __prepare_ICR2(unsigned int mask)
50 {
51 return SET_APIC_DEST_FIELD(mask);
52 }
53
__xapic_wait_icr_idle(void)54 static inline void __xapic_wait_icr_idle(void)
55 {
56 while (native_apic_mem_read(APIC_ICR) & APIC_ICR_BUSY)
57 cpu_relax();
58 }
59
60 static inline void
__default_send_IPI_shortcut(unsigned int shortcut,int vector,unsigned int dest)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 */
92 static inline void
__default_send_IPI_dest_field(unsigned int mask,int vector,unsigned int dest)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
122 extern void default_send_IPI_mask_sequence_phys(const struct cpumask *mask,
123 int vector);
124 extern 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
130 extern int no_broadcast;
131
__default_local_send_IPI_allbutself(int vector)132 static 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
__default_local_send_IPI_all(int vector)140 static 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
149 extern void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
150 int vector);
151 extern void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask,
152 int vector);
153 extern void default_send_IPI_mask_logical(const struct cpumask *mask,
154 int vector);
155 extern void default_send_IPI_allbutself(int vector);
156 extern void default_send_IPI_all(int vector);
157 extern void default_send_IPI_self(int vector);
158 #endif
159
160 #endif
161
162 #endif /* _ASM_X86_IPI_H */
163