drm_wait_netbsd.h revision 1.3
1 /* $NetBSD: drm_wait_netbsd.h,v 1.3 2014/07/16 20:56:25 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _DRM_DRM_WAIT_NETBSD_H_ 33 #define _DRM_DRM_WAIT_NETBSD_H_ 34 35 #include <sys/param.h> 36 #include <sys/condvar.h> 37 #if DIAGNOSTIC 38 #include <sys/cpu.h> /* cpu_intr_p */ 39 #endif 40 #include <sys/kernel.h> 41 #include <sys/mutex.h> 42 #include <sys/systm.h> 43 44 #include <linux/mutex.h> 45 #include <linux/spinlock.h> 46 47 typedef kcondvar_t drm_waitqueue_t; 48 49 #define DRM_HZ hz /* XXX Hurk... */ 50 51 static inline void 52 DRM_INIT_WAITQUEUE(drm_waitqueue_t *q, const char *name) 53 { 54 cv_init(q, name); 55 } 56 57 static inline void 58 DRM_DESTROY_WAITQUEUE(drm_waitqueue_t *q) 59 { 60 cv_destroy(q); 61 } 62 63 static inline bool 64 DRM_WAITERS_P(drm_waitqueue_t *q, struct mutex *interlock) 65 { 66 KASSERT(mutex_is_locked(interlock)); 67 return cv_has_waiters(q); 68 } 69 70 static inline void 71 DRM_WAKEUP_ONE(drm_waitqueue_t *q, struct mutex *interlock) 72 { 73 KASSERT(mutex_is_locked(interlock)); 74 cv_signal(q); 75 } 76 77 static inline void 78 DRM_WAKEUP_ALL(drm_waitqueue_t *q, struct mutex *interlock) 79 { 80 KASSERT(mutex_is_locked(interlock)); 81 cv_broadcast(q); 82 } 83 84 static inline bool 85 DRM_SPIN_WAITERS_P(drm_waitqueue_t *q, spinlock_t *interlock) 86 { 87 KASSERT(spin_is_locked(interlock)); 88 return cv_has_waiters(q); 89 } 90 91 static inline void 92 DRM_SPIN_WAKEUP_ONE(drm_waitqueue_t *q, spinlock_t *interlock) 93 { 94 KASSERT(spin_is_locked(interlock)); 95 cv_signal(q); 96 } 97 98 static inline void 99 DRM_SPIN_WAKEUP_ALL(drm_waitqueue_t *q, spinlock_t *interlock) 100 { 101 KASSERT(spin_is_locked(interlock)); 102 cv_broadcast(q); 103 } 104 105 #define _DRM_WAIT_UNTIL(RET, WAIT, Q, INTERLOCK, CONDITION) do \ 106 { \ 107 KASSERT(mutex_is_locked((INTERLOCK))); \ 108 ASSERT_SLEEPABLE(); \ 109 KASSERT(!cold); \ 110 for (;;) { \ 111 if (CONDITION) { \ 112 (RET) = 0; \ 113 break; \ 114 } \ 115 /* XXX errno NetBSD->Linux */ \ 116 (RET) = -WAIT((Q), &(INTERLOCK)->mtx_lock); \ 117 if (RET) \ 118 break; \ 119 } \ 120 } while (0) 121 122 #define cv_wait_nointr(Q, I) (cv_wait((Q), (I)), 0) 123 124 #define DRM_WAIT_NOINTR_UNTIL(RET, Q, I, C) \ 125 _DRM_WAIT_UNTIL(RET, cv_wait_nointr, Q, I, C) 126 127 #define DRM_WAIT_UNTIL(RET, Q, I, C) \ 128 _DRM_WAIT_UNTIL(RET, cv_wait_sig, Q, I, C) 129 130 #define _DRM_TIMED_WAIT_UNTIL(RET, WAIT, Q, INTERLOCK, TICKS, CONDITION) do \ 131 { \ 132 extern int hardclock_ticks; \ 133 const int _dtwu_start = hardclock_ticks; \ 134 int _dtwu_ticks = (TICKS); \ 135 KASSERT(mutex_is_locked((INTERLOCK))); \ 136 ASSERT_SLEEPABLE(); \ 137 KASSERT(!cold); \ 138 for (;;) { \ 139 if (CONDITION) { \ 140 (RET) = _dtwu_ticks; \ 141 break; \ 142 } \ 143 /* XXX errno NetBSD->Linux */ \ 144 (RET) = -WAIT((Q), &(INTERLOCK)->mtx_lock, \ 145 _dtwu_ticks); \ 146 if (RET) \ 147 break; \ 148 const int _dtwu_now = hardclock_ticks; \ 149 KASSERT(_dtwu_start <= _dtwu_now); \ 150 if ((_dtwu_now - _dtwu_start) < _dtwu_ticks) { \ 151 _dtwu_ticks -= (_dtwu_now - _dtwu_start); \ 152 } else { \ 153 (RET) = 0; \ 154 break; \ 155 } \ 156 } \ 157 } while (0) 158 159 #define DRM_TIMED_WAIT_NOINTR_UNTIL(RET, Q, I, T, C) \ 160 _DRM_TIMED_WAIT_UNTIL(RET, cv_timedwait, Q, I, T, C) 161 162 #define DRM_TIMED_WAIT_UNTIL(RET, Q, I, T, C) \ 163 _DRM_TIMED_WAIT_UNTIL(RET, cv_timedwait_sig, Q, I, T, C) 164 165 /* 166 * XXX Can't assert sleepable here because we hold a spin lock. At 167 * least we can assert that we're not in (soft) interrupt context, and 168 * hope that nobody tries to use these with a sometimes quickly 169 * satisfied condition while holding a different spin lock. 170 */ 171 172 #define _DRM_SPIN_WAIT_UNTIL(RET, WAIT, Q, INTERLOCK, CONDITION) do \ 173 { \ 174 KASSERT(spin_is_locked((INTERLOCK))); \ 175 KASSERT(!cpu_intr_p()); \ 176 KASSERT(!cpu_softintr_p()); \ 177 KASSERT(!cold); \ 178 while (!(CONDITION)) { \ 179 /* XXX errno NetBSD->Linux */ \ 180 (RET) = -WAIT((Q), &(INTERLOCK)->sl_lock); \ 181 if (RET) \ 182 break; \ 183 } \ 184 } while (0) 185 186 #define DRM_SPIN_WAIT_NOINTR_UNTIL(RET, Q, I, C) \ 187 _DRM_SPIN_WAIT_UNTIL(RET, cv_wait_nointr, Q, I, C) 188 189 #define DRM_SPIN_WAIT_UNTIL(RET, Q, I, C) \ 190 _DRM_SPIN_WAIT_UNTIL(RET, cv_wait_sig, Q, I, C) 191 192 #define _DRM_SPIN_TIMED_WAIT_UNTIL(RET, WAIT, Q, INTERLOCK, TICKS, CONDITION) \ 193 do \ 194 { \ 195 extern int hardclock_ticks; \ 196 const int _dstwu_start = hardclock_ticks; \ 197 int _dstwu_ticks = (TICKS); \ 198 KASSERT(spin_is_locked((INTERLOCK))); \ 199 KASSERT(!cpu_intr_p()); \ 200 KASSERT(!cpu_softintr_p()); \ 201 KASSERT(!cold); \ 202 for (;;) { \ 203 if (CONDITION) { \ 204 (RET) = _dstwu_ticks; \ 205 break; \ 206 } \ 207 /* XXX errno NetBSD->Linux */ \ 208 (RET) = -WAIT((Q), &(INTERLOCK)->sl_lock, \ 209 _dstwu_ticks); \ 210 if (RET) \ 211 break; \ 212 const int _dstwu_now = hardclock_ticks; \ 213 KASSERT(_dstwu_start <= _dstwu_now); \ 214 if ((_dstwu_now - _dstwu_start) < _dstwu_ticks) { \ 215 _dstwu_ticks -= (_dstwu_now - _dstwu_start); \ 216 } else { \ 217 (RET) = 0; \ 218 break; \ 219 } \ 220 } \ 221 } while (0) 222 223 #define DRM_SPIN_TIMED_WAIT_NOINTR_UNTIL(RET, Q, I, T, C) \ 224 _DRM_SPIN_TIMED_WAIT_UNTIL(RET, cv_timedwait, Q, I, T, C) 225 226 #define DRM_SPIN_TIMED_WAIT_UNTIL(RET, Q, I, T, C) \ 227 _DRM_SPIN_TIMED_WAIT_UNTIL(RET, cv_timedwait_sig, Q, I, T, C) 228 229 #endif /* _DRM_DRM_WAIT_NETBSD_H_ */ 230
Indexes created Tue Sep 30 20:09:53 GMT 2025