diff options
Diffstat (limited to 'include/linux/hardirq.h')
-rw-r--r-- | include/linux/hardirq.h | 117 |
1 files changed, 1 insertions, 116 deletions
diff --git a/include/linux/hardirq.h b/include/linux/hardirq.h index 05bcc0903766..ccfe17c5c8da 100644 --- a/include/linux/hardirq.h +++ b/include/linux/hardirq.h | |||
@@ -1,126 +1,11 @@ | |||
1 | #ifndef LINUX_HARDIRQ_H | 1 | #ifndef LINUX_HARDIRQ_H |
2 | #define LINUX_HARDIRQ_H | 2 | #define LINUX_HARDIRQ_H |
3 | 3 | ||
4 | #include <linux/preempt.h> | 4 | #include <linux/preempt_mask.h> |
5 | #include <linux/lockdep.h> | 5 | #include <linux/lockdep.h> |
6 | #include <linux/ftrace_irq.h> | 6 | #include <linux/ftrace_irq.h> |
7 | #include <linux/vtime.h> | 7 | #include <linux/vtime.h> |
8 | #include <asm/hardirq.h> | ||
9 | 8 | ||
10 | /* | ||
11 | * We put the hardirq and softirq counter into the preemption | ||
12 | * counter. The bitmask has the following meaning: | ||
13 | * | ||
14 | * - bits 0-7 are the preemption count (max preemption depth: 256) | ||
15 | * - bits 8-15 are the softirq count (max # of softirqs: 256) | ||
16 | * | ||
17 | * The hardirq count can in theory reach the same as NR_IRQS. | ||
18 | * In reality, the number of nested IRQS is limited to the stack | ||
19 | * size as well. For archs with over 1000 IRQS it is not practical | ||
20 | * to expect that they will all nest. We give a max of 10 bits for | ||
21 | * hardirq nesting. An arch may choose to give less than 10 bits. | ||
22 | * m68k expects it to be 8. | ||
23 | * | ||
24 | * - bits 16-25 are the hardirq count (max # of nested hardirqs: 1024) | ||
25 | * - bit 26 is the NMI_MASK | ||
26 | * - bit 27 is the PREEMPT_ACTIVE flag | ||
27 | * | ||
28 | * PREEMPT_MASK: 0x000000ff | ||
29 | * SOFTIRQ_MASK: 0x0000ff00 | ||
30 | * HARDIRQ_MASK: 0x03ff0000 | ||
31 | * NMI_MASK: 0x04000000 | ||
32 | */ | ||
33 | #define PREEMPT_BITS 8 | ||
34 | #define SOFTIRQ_BITS 8 | ||
35 | #define NMI_BITS 1 | ||
36 | |||
37 | #define MAX_HARDIRQ_BITS 10 | ||
38 | |||
39 | #ifndef HARDIRQ_BITS | ||
40 | # define HARDIRQ_BITS MAX_HARDIRQ_BITS | ||
41 | #endif | ||
42 | |||
43 | #if HARDIRQ_BITS > MAX_HARDIRQ_BITS | ||
44 | #error HARDIRQ_BITS too high! | ||
45 | #endif | ||
46 | |||
47 | #define PREEMPT_SHIFT 0 | ||
48 | #define SOFTIRQ_SHIFT (PREEMPT_SHIFT + PREEMPT_BITS) | ||
49 | #define HARDIRQ_SHIFT (SOFTIRQ_SHIFT + SOFTIRQ_BITS) | ||
50 | #define NMI_SHIFT (HARDIRQ_SHIFT + HARDIRQ_BITS) | ||
51 | |||
52 | #define __IRQ_MASK(x) ((1UL << (x))-1) | ||
53 | |||
54 | #define PREEMPT_MASK (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT) | ||
55 | #define SOFTIRQ_MASK (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT) | ||
56 | #define HARDIRQ_MASK (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT) | ||
57 | #define NMI_MASK (__IRQ_MASK(NMI_BITS) << NMI_SHIFT) | ||
58 | |||
59 | #define PREEMPT_OFFSET (1UL << PREEMPT_SHIFT) | ||
60 | #define SOFTIRQ_OFFSET (1UL << SOFTIRQ_SHIFT) | ||
61 | #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT) | ||
62 | #define NMI_OFFSET (1UL << NMI_SHIFT) | ||
63 | |||
64 | #define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET) | ||
65 | |||
66 | #ifndef PREEMPT_ACTIVE | ||
67 | #define PREEMPT_ACTIVE_BITS 1 | ||
68 | #define PREEMPT_ACTIVE_SHIFT (NMI_SHIFT + NMI_BITS) | ||
69 | #define PREEMPT_ACTIVE (__IRQ_MASK(PREEMPT_ACTIVE_BITS) << PREEMPT_ACTIVE_SHIFT) | ||
70 | #endif | ||
71 | |||
72 | #if PREEMPT_ACTIVE < (1 << (NMI_SHIFT + NMI_BITS)) | ||
73 | #error PREEMPT_ACTIVE is too low! | ||
74 | #endif | ||
75 | |||
76 | #define hardirq_count() (preempt_count() & HARDIRQ_MASK) | ||
77 | #define softirq_count() (preempt_count() & SOFTIRQ_MASK) | ||
78 | #define irq_count() (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK \ | ||
79 | | NMI_MASK)) | ||
80 | |||
81 | /* | ||
82 | * Are we doing bottom half or hardware interrupt processing? | ||
83 | * Are we in a softirq context? Interrupt context? | ||
84 | * in_softirq - Are we currently processing softirq or have bh disabled? | ||
85 | * in_serving_softirq - Are we currently processing softirq? | ||
86 | */ | ||
87 | #define in_irq() (hardirq_count()) | ||
88 | #define in_softirq() (softirq_count()) | ||
89 | #define in_interrupt() (irq_count()) | ||
90 | #define in_serving_softirq() (softirq_count() & SOFTIRQ_OFFSET) | ||
91 | |||
92 | /* | ||
93 | * Are we in NMI context? | ||
94 | */ | ||
95 | #define in_nmi() (preempt_count() & NMI_MASK) | ||
96 | |||
97 | #if defined(CONFIG_PREEMPT_COUNT) | ||
98 | # define PREEMPT_CHECK_OFFSET 1 | ||
99 | #else | ||
100 | # define PREEMPT_CHECK_OFFSET 0 | ||
101 | #endif | ||
102 | |||
103 | /* | ||
104 | * Are we running in atomic context? WARNING: this macro cannot | ||
105 | * always detect atomic context; in particular, it cannot know about | ||
106 | * held spinlocks in non-preemptible kernels. Thus it should not be | ||
107 | * used in the general case to determine whether sleeping is possible. | ||
108 | * Do not use in_atomic() in driver code. | ||
109 | */ | ||
110 | #define in_atomic() ((preempt_count() & ~PREEMPT_ACTIVE) != 0) | ||
111 | |||
112 | /* | ||
113 | * Check whether we were atomic before we did preempt_disable(): | ||
114 | * (used by the scheduler, *after* releasing the kernel lock) | ||
115 | */ | ||
116 | #define in_atomic_preempt_off() \ | ||
117 | ((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_CHECK_OFFSET) | ||
118 | |||
119 | #ifdef CONFIG_PREEMPT_COUNT | ||
120 | # define preemptible() (preempt_count() == 0 && !irqs_disabled()) | ||
121 | #else | ||
122 | # define preemptible() 0 | ||
123 | #endif | ||
124 | 9 | ||
125 | #if defined(CONFIG_SMP) || defined(CONFIG_GENERIC_HARDIRQS) | 10 | #if defined(CONFIG_SMP) || defined(CONFIG_GENERIC_HARDIRQS) |
126 | extern void synchronize_irq(unsigned int irq); | 11 | extern void synchronize_irq(unsigned int irq); |