1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, 2012, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 */
36
37 #define DEBUG_SUBSYSTEM S_LNET
38 #include <linux/module.h>
39 #include <linux/kernel.h>
40 #include <linux/fs_struct.h>
41 #include <linux/sched.h>
42
43 #include "../../../include/linux/libcfs/libcfs.h"
44
45 #if defined(CONFIG_KGDB)
46 #include <asm/kgdb.h>
47 #endif
48
49 /**
50 * wait_queue_t of Linux (version < 2.6.34) is a FIFO list for exclusively
51 * waiting threads, which is not always desirable because all threads will
52 * be waken up again and again, even user only needs a few of them to be
53 * active most time. This is not good for performance because cache can
54 * be polluted by different threads.
55 *
56 * LIFO list can resolve this problem because we always wakeup the most
57 * recent active thread by default.
58 *
59 * NB: please don't call non-exclusive & exclusive wait on the same
60 * waitq if add_wait_queue_exclusive_head is used.
61 */
62 void
add_wait_queue_exclusive_head(wait_queue_head_t * waitq,wait_queue_t * link)63 add_wait_queue_exclusive_head(wait_queue_head_t *waitq, wait_queue_t *link)
64 {
65 unsigned long flags;
66
67 spin_lock_irqsave(&waitq->lock, flags);
68 __add_wait_queue_exclusive(waitq, link);
69 spin_unlock_irqrestore(&waitq->lock, flags);
70 }
71 EXPORT_SYMBOL(add_wait_queue_exclusive_head);
72
cfs_init_timer(struct timer_list * t)73 void cfs_init_timer(struct timer_list *t)
74 {
75 init_timer(t);
76 }
77 EXPORT_SYMBOL(cfs_init_timer);
78
cfs_timer_init(struct timer_list * t,cfs_timer_func_t * func,void * arg)79 void cfs_timer_init(struct timer_list *t, cfs_timer_func_t *func, void *arg)
80 {
81 init_timer(t);
82 t->function = func;
83 t->data = (unsigned long)arg;
84 }
85 EXPORT_SYMBOL(cfs_timer_init);
86
cfs_timer_done(struct timer_list * t)87 void cfs_timer_done(struct timer_list *t)
88 {
89 return;
90 }
91 EXPORT_SYMBOL(cfs_timer_done);
92
cfs_timer_arm(struct timer_list * t,unsigned long deadline)93 void cfs_timer_arm(struct timer_list *t, unsigned long deadline)
94 {
95 mod_timer(t, deadline);
96 }
97 EXPORT_SYMBOL(cfs_timer_arm);
98
cfs_timer_disarm(struct timer_list * t)99 void cfs_timer_disarm(struct timer_list *t)
100 {
101 del_timer(t);
102 }
103 EXPORT_SYMBOL(cfs_timer_disarm);
104
cfs_timer_is_armed(struct timer_list * t)105 int cfs_timer_is_armed(struct timer_list *t)
106 {
107 return timer_pending(t);
108 }
109 EXPORT_SYMBOL(cfs_timer_is_armed);
110
cfs_timer_deadline(struct timer_list * t)111 unsigned long cfs_timer_deadline(struct timer_list *t)
112 {
113 return t->expires;
114 }
115 EXPORT_SYMBOL(cfs_timer_deadline);
116
cfs_enter_debugger(void)117 void cfs_enter_debugger(void)
118 {
119 #if defined(CONFIG_KGDB)
120 // BREAKPOINT();
121 #else
122 /* nothing */
123 #endif
124 }
125
126
127 sigset_t
cfs_block_allsigs(void)128 cfs_block_allsigs(void)
129 {
130 unsigned long flags;
131 sigset_t old;
132
133 spin_lock_irqsave(¤t->sighand->siglock, flags);
134 old = current->blocked;
135 sigfillset(¤t->blocked);
136 recalc_sigpending();
137 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
138
139 return old;
140 }
141
cfs_block_sigs(unsigned long sigs)142 sigset_t cfs_block_sigs(unsigned long sigs)
143 {
144 unsigned long flags;
145 sigset_t old;
146
147 spin_lock_irqsave(¤t->sighand->siglock, flags);
148 old = current->blocked;
149 sigaddsetmask(¤t->blocked, sigs);
150 recalc_sigpending();
151 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
152 return old;
153 }
154
155 /* Block all signals except for the @sigs */
cfs_block_sigsinv(unsigned long sigs)156 sigset_t cfs_block_sigsinv(unsigned long sigs)
157 {
158 unsigned long flags;
159 sigset_t old;
160
161 spin_lock_irqsave(¤t->sighand->siglock, flags);
162 old = current->blocked;
163 sigaddsetmask(¤t->blocked, ~sigs);
164 recalc_sigpending();
165 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
166
167 return old;
168 }
169
170 void
cfs_restore_sigs(sigset_t old)171 cfs_restore_sigs (sigset_t old)
172 {
173 unsigned long flags;
174
175 spin_lock_irqsave(¤t->sighand->siglock, flags);
176 current->blocked = old;
177 recalc_sigpending();
178 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
179 }
180
181 int
cfs_signal_pending(void)182 cfs_signal_pending(void)
183 {
184 return signal_pending(current);
185 }
186
187 void
cfs_clear_sigpending(void)188 cfs_clear_sigpending(void)
189 {
190 unsigned long flags;
191
192 spin_lock_irqsave(¤t->sighand->siglock, flags);
193 clear_tsk_thread_flag(current, TIF_SIGPENDING);
194 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
195 }
196
197 int
libcfs_arch_init(void)198 libcfs_arch_init(void)
199 {
200 return 0;
201 }
202
203 void
libcfs_arch_cleanup(void)204 libcfs_arch_cleanup(void)
205 {
206 return;
207 }
208
209 EXPORT_SYMBOL(libcfs_arch_init);
210 EXPORT_SYMBOL(libcfs_arch_cleanup);
211 EXPORT_SYMBOL(cfs_enter_debugger);
212 EXPORT_SYMBOL(cfs_block_allsigs);
213 EXPORT_SYMBOL(cfs_block_sigs);
214 EXPORT_SYMBOL(cfs_block_sigsinv);
215 EXPORT_SYMBOL(cfs_restore_sigs);
216 EXPORT_SYMBOL(cfs_signal_pending);
217 EXPORT_SYMBOL(cfs_clear_sigpending);
218