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1/*
2 * SYS/MSGPORT.H
3 *
4 * Implements LWKT messages and ports.
5 *
6 * $DragonFly: src/sys/sys/msgport.h,v 1.28 2008/08/25 23:34:34 dillon Exp $
7 */
8
9#ifndef _SYS_MSGPORT_H_
10#define _SYS_MSGPORT_H_
11
12#ifndef _SYS_QUEUE_H_
13#include <sys/queue.h> /* TAILQ_* macros */
14#endif
15#ifndef _SYS_STDINT_H_
16#include <sys/stdint.h>
17#endif
18#ifndef _SYS_SPINLOCK_H_
19#include <sys/spinlock.h>
20#endif
21
22#ifdef _KERNEL
23
24#ifndef _SYS_MALLOC_H_
25#include <sys/malloc.h>
26#endif
27
28#endif
29
30struct lwkt_msg;
31struct lwkt_port;
32struct lwkt_serialize;
33struct thread;
34
35typedef struct lwkt_msg *lwkt_msg_t;
36typedef struct lwkt_port *lwkt_port_t;
37
38typedef TAILQ_HEAD(lwkt_msg_queue, lwkt_msg) lwkt_msg_queue;
39
40/*
41 * The standard message and port structure for communications between
42 * threads. See kern/lwkt_msgport.c for documentation on how messages and
43 * ports work.
44 *
45 * A message may only be manipulated by whomever currently owns it,
46 * which generally means the originating port if the message has
47 * not been sent yet or has been replied, and the target port if the message
48 * has been sent and/or is undergoing processing.
49 *
50 * NOTE! 64-bit-align this structure.
51 */
52typedef struct lwkt_msg {
53 TAILQ_ENTRY(lwkt_msg) ms_node; /* link node */
54 lwkt_port_t ms_target_port; /* current target or relay port */
55 lwkt_port_t ms_reply_port; /* async replies returned here */
56 void (*ms_abortfn)(struct lwkt_msg *);
57 int ms_flags; /* message flags */
58 int ms_error; /* positive error code or 0 */
59 union {
60 void *ms_resultp; /* misc pointer data or result */
61 int ms_result; /* standard 'int'eger result */
62 long ms_lresult; /* long result */
63 int ms_fds[2]; /* two int bit results */
64 __int32_t ms_result32; /* 32 bit result */
65 __int64_t ms_result64; /* 64 bit result */
66 __off_t ms_offset; /* off_t result */
67 } u;
68 int ms_pad[2]; /* future use */
69} lwkt_msg;
70
71/*
72 * Message state flags are manipulated by the current owner only.
73 *
74 * DONE Indicates completion of the reply. This flag is also set
75 * for unsent messages.
76 *
77 * REPLY Indicates message is being replied but may or may not
78 * have been queued or returned yet. This bit is left set
79 * when a message is retrieved from a reply port so the caller
80 * can distinguish between requests and replies.
81 *
82 * QUEUED Indicates message is queued on reply or target port, or
83 * some other port.
84 *
85 * SYNC Indicates that the originator is blocked directly on the
86 * message and that the message should be signaled on
87 * completion instead of queued.
88 *
89 * INTRANSIT Indicates that the message state is indeterminant (e.g.
90 * being passed through an IPI).
91 *
92 * ABORTABLE Static flag indicates that ms_abortfn is valid.
93 *
94 * High 16 bits are available to message handlers.
95 */
96#define MSGF_DONE 0x0001 /* message is complete */
97#define MSGF_REPLY 0x0002 /* asynch message has been returned */
98#define MSGF_QUEUED 0x0004 /* message has been queued sanitychk */
99#define MSGF_SYNC 0x0008 /* synchronous message operation */
100#define MSGF_INTRANSIT 0x0010 /* in-transit (IPI) */
101#define MSGF_ABORTABLE 0x0080 /* message supports abort */
102
103#define MSGF_USER0 0x00010000
104#define MSGF_USER1 0x00020000
105#define MSGF_USER2 0x00040000
106#define MSGF_USER3 0x00080000
107
108#define MSG_CMD_CDEV 0x00010000
109#define MSG_CMD_VFS 0x00020000
110#define MSG_CMD_SYSCALL 0x00030000
111#define MSG_SUBCMD_MASK 0x0000FFFF
112
113#ifdef _KERNEL
114MALLOC_DECLARE(M_LWKTMSG);
115#endif
116
117/*
118 * Notes on port processing requirements:
119 *
120 * mp_putport():
121 * - may return synchronous error code (error != EASYNC) directly and
122 * does not need to check or set MSGF_DONE if so, or set ms_target_port
123 * - for asynch procesing should clear MSGF_DONE and set ms_target_port
124 * to port prior to initiation of the command.
125 *
126 * mp_waitmsg():
127 * - wait for a particular message to be returned.
128 *
129 * mp_waitport():
130 * - wait for a new message on the specified port.
131 *
132 * mp_replyport():
133 * - reply a message (executed on the originating port to return a
134 * message to it). This can be rather involved if abort is to be
135 * supported, see lwkt_default_replyport(). Generally speaking
136 * one sets MSGF_DONE. If MSGF_SYNC is set the message is not
137 * queued to the port and the reply code wakes up the waiter
138 * directly.
139 *
140 * The use of mp_u.td and mp_u.spin is specific to the port callback function
141 * set. Default ports are tied to specific threads and use cpu locality
142 * of reference and mp_u.td (and not mp_u.spin at all). Descriptor ports
143 * assume access via descriptors, signal interruption, etc. Such ports use
144 * mp_u.spin (and not mp_u.td at all) and may be accessed by multiple threads.
145 */
146typedef struct lwkt_port {
147 lwkt_msg_queue mp_msgq;
148 int mp_flags;
149 union {
150 struct spinlock spin;
151 struct thread *td;
152 struct lwkt_serialize *serialize;
153 void *data;
154 } mp_u;
155 void * (*mp_getport)(lwkt_port_t);
156 int (*mp_putport)(lwkt_port_t, lwkt_msg_t);
157 int (*mp_waitmsg)(lwkt_msg_t, int flags);
158 void * (*mp_waitport)(lwkt_port_t, int flags);
159 void (*mp_replyport)(lwkt_port_t, lwkt_msg_t);
160} lwkt_port;
161
162#ifdef _KERNEL
163
164#define mpu_td mp_u.td
165#define mpu_spin mp_u.spin
166#define mpu_serialize mp_u.serialize
167#define mpu_data mp_u.data
168
169#endif
170
171#define MSGPORTF_WAITING 0x0001
172
173/*
174 * These functions are good for userland as well as the kernel. The
175 * messaging function support for userland is provided by the kernel's
176 * kern/lwkt_msgport.c. The port functions are provided by userland.
177 */
178
179void lwkt_initport_thread(lwkt_port_t, struct thread *);
180void lwkt_initport_spin(lwkt_port_t);
181void lwkt_initport_serialize(lwkt_port_t, struct lwkt_serialize *);
182void lwkt_initport_panic(lwkt_port_t);
183void lwkt_initport_replyonly_null(lwkt_port_t);
184void lwkt_initport_replyonly(lwkt_port_t,
185 void (*rportfn)(lwkt_port_t, lwkt_msg_t));
186void lwkt_initport_putonly(lwkt_port_t,
187 int (*pportfn)(lwkt_port_t, lwkt_msg_t));
188
189void lwkt_sendmsg(lwkt_port_t, lwkt_msg_t);
190int lwkt_domsg(lwkt_port_t, lwkt_msg_t, int);
191int lwkt_forwardmsg(lwkt_port_t, lwkt_msg_t);
192void lwkt_abortmsg(lwkt_msg_t);
193
194#endif