2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #ifndef _SYS_INTERRUPT_H_
32 #define _SYS_INTERRUPT_H_
34 #include <sys/_lock.h>
35 #include <sys/_mutex.h>
43 * Describe a hardware interrupt handler.
45 * Multiple interrupt handlers for a specific event can be chained
49 driver_filter_t *ih_filter; /* Filter handler function. */
50 driver_intr_t *ih_handler; /* Threaded handler function. */
51 void *ih_argument; /* Argument to pass to handlers. */
53 char ih_name[MAXCOMLEN + 1]; /* Name of handler. */
54 struct intr_event *ih_event; /* Event we are connected to. */
55 int ih_need; /* Needs service. */
56 CK_SLIST_ENTRY(intr_handler) ih_next; /* Next handler for this event. */
57 u_char ih_pri; /* Priority of this handler. */
58 struct intr_thread *ih_thread; /* Ithread for filtered handler. */
61 /* Interrupt handle flags kept in ih_flags */
62 #define IH_EXCLUSIVE 0x00000002 /* Exclusive interrupt. */
63 #define IH_ENTROPY 0x00000004 /* Device is a good entropy source. */
64 #define IH_DEAD 0x00000008 /* Handler should be removed. */
65 #define IH_MPSAFE 0x80000000 /* Handler does not need Giant. */
68 * Describe an interrupt event. An event holds a list of handlers.
69 * The 'pre_ithread', 'post_ithread', 'post_filter', and 'assign_cpu'
70 * hooks are used to invoke MD code for certain operations.
72 * The 'pre_ithread' hook is called when an interrupt thread for
73 * handlers without filters is scheduled. It is responsible for
74 * ensuring that 1) the system won't be swamped with an interrupt
75 * storm from the associated source while the ithread runs and 2) the
76 * current CPU is able to receive interrupts from other interrupt
77 * sources. The first is usually accomplished by disabling
78 * level-triggered interrupts until the ithread completes. The second
79 * is accomplished on some platforms by acknowledging the interrupt
82 * The 'post_ithread' hook is invoked when an ithread finishes. It is
83 * responsible for ensuring that the associated interrupt source will
84 * trigger an interrupt when it is asserted in the future. Usually
85 * this is implemented by enabling a level-triggered interrupt that
86 * was previously disabled via the 'pre_ithread' hook.
88 * The 'post_filter' hook is invoked when a filter handles an
89 * interrupt. It is responsible for ensuring that the current CPU is
90 * able to receive interrupts again. On some platforms this is done
91 * by acknowledging the interrupts via an EOI.
93 * The 'assign_cpu' hook is used to bind an interrupt source to a
94 * specific CPU. If the interrupt cannot be bound, this function may
97 * Note that device drivers may also use interrupt events to manage
98 * multiplexing interrupt interrupt handler into handlers for child
99 * devices. In that case, the above hooks are not used. The device
100 * can create an event for its interrupt resource and register child
101 * event handlers with that event. It can then use
102 * intr_event_execute_handlers() to execute non-filter handlers.
103 * Currently filter handlers are not supported by this, but that can
104 * be added by splitting out the filter loop from intr_event_handle()
108 TAILQ_ENTRY(intr_event) ie_list;
109 CK_SLIST_HEAD(, intr_handler) ie_handlers; /* Interrupt handlers. */
110 char ie_name[MAXCOMLEN + 1]; /* Individual event name. */
111 char ie_fullname[MAXCOMLEN + 1];
113 void *ie_source; /* Cookie used by MD code. */
114 struct intr_thread *ie_thread; /* Thread we are connected to. */
115 void (*ie_pre_ithread)(void *);
116 void (*ie_post_ithread)(void *);
117 void (*ie_post_filter)(void *);
118 int (*ie_assign_cpu)(void *, int);
120 int ie_count; /* Loop counter. */
121 int ie_warncnt; /* Rate-check interrupt storm warns. */
122 struct timeval ie_warntm;
123 int ie_irq; /* Physical irq number if !SOFT. */
124 int ie_cpu; /* CPU this event is bound to. */
127 /* Interrupt event flags kept in ie_flags. */
128 #define IE_SOFT 0x000001 /* Software interrupt. */
129 #define IE_ENTROPY 0x000002 /* Interrupt is an entropy source. */
130 #define IE_ADDING_THREAD 0x000004 /* Currently building an ithread. */
132 /* Flags to pass to sched_swi. */
133 #define SWI_DELAY 0x2
136 * Software interrupt numbers in priority order. The priority determines
137 * the priority of the corresponding interrupt thread.
144 #define SWI_TQ_FAST 5
146 #define SWI_TQ_GIANT 6
150 extern struct intr_event *tty_intr_event;
151 extern struct intr_event *clk_intr_event;
154 /* Counts and names for statistics (defined in MD code). */
155 extern u_long intrcnt[]; /* counts for for each device and stray */
156 extern char intrnames[]; /* string table containing device names */
157 extern size_t sintrcnt; /* size of intrcnt table */
158 extern size_t sintrnames; /* size of intrnames table */
161 void db_dump_intr_event(struct intr_event *ie, int handlers);
163 u_char intr_priority(enum intr_type flags);
164 int intr_event_add_handler(struct intr_event *ie, const char *name,
165 driver_filter_t filter, driver_intr_t handler, void *arg,
166 u_char pri, enum intr_type flags, void **cookiep);
167 int intr_event_bind(struct intr_event *ie, int cpu);
168 int intr_event_bind_irqonly(struct intr_event *ie, int cpu);
169 int intr_event_bind_ithread(struct intr_event *ie, int cpu);
170 int intr_event_create(struct intr_event **event, void *source,
171 int flags, int irq, void (*pre_ithread)(void *),
172 void (*post_ithread)(void *), void (*post_filter)(void *),
173 int (*assign_cpu)(void *, int), const char *fmt, ...)
175 int intr_event_describe_handler(struct intr_event *ie, void *cookie,
177 int intr_event_destroy(struct intr_event *ie);
178 int intr_event_handle(struct intr_event *ie, struct trapframe *frame);
179 int intr_event_remove_handler(void *cookie);
180 int intr_getaffinity(int irq, int mode, void *mask);
181 void *intr_handler_source(void *cookie);
182 int intr_setaffinity(int irq, int mode, void *mask);
183 void _intr_drain(int irq); /* Linux compat only. */
184 int swi_add(struct intr_event **eventp, const char *name,
185 driver_intr_t handler, void *arg, int pri, enum intr_type flags,
187 void swi_sched(void *cookie, int flags);
188 int swi_remove(void *cookie);