1 /* $NetBSD: dma-resv.h,v 1.10 2021/12/19 12:21:30 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2018 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 _LINUX_DMA_RESV_H_ 33 #define _LINUX_DMA_RESV_H_ 34 35 #include <linux/dma-fence.h> 36 #include <linux/rcupdate.h> 37 #include <linux/seqlock.h> 38 #include <linux/ww_mutex.h> 39 40 struct dma_resv { 41 struct ww_mutex lock; 42 struct seqcount seq; 43 struct dma_fence __rcu *fence_excl; 44 struct dma_resv_list __rcu *fence; 45 46 struct dma_resv_list __rcu *robj_prealloc; 47 }; 48 49 struct dma_resv_list { 50 struct rcu_head rol_rcu; 51 52 uint32_t shared_count; 53 uint32_t shared_max; 54 struct dma_fence __rcu *shared[]; 55 }; 56 57 /* NetBSD addition */ 58 struct dma_resv_poll { 59 kmutex_t rp_lock; 60 struct selinfo rp_selq; 61 struct dma_fence_cb rp_fcb; 62 bool rp_claimed; 63 }; 64 65 #define dma_resv_add_excl_fence linux_dma_resv_add_excl_fence 66 #define dma_resv_add_shared_fence linux_dma_resv_add_shared_fence 67 #define dma_resv_assert_held linux_dma_resv_assert_held 68 #define dma_resv_copy_fences linux_dma_resv_copy_fences 69 #define dma_resv_do_poll linux_dma_resv_do_poll 70 #define dma_resv_fini linux_dma_resv_fini 71 #define dma_resv_get_excl linux_dma_resv_get_excl 72 #define dma_resv_get_excl_rcu linux_dma_resv_get_excl_rcu 73 #define dma_resv_get_fences_rcu linux_dma_resv_get_fences_rcu 74 #define dma_resv_get_list linux_dma_resv_get_list 75 #define dma_resv_held linux_dma_resv_held 76 #define dma_resv_init linux_dma_resv_init 77 #define dma_resv_is_locked linux_dma_resv_is_locked 78 #define dma_resv_kqfilter linux_dma_resv_kqfilter 79 #define dma_resv_lock linux_dma_resv_lock 80 #define dma_resv_lock_interruptible linux_dma_resv_lock_interruptible 81 #define dma_resv_lock_slow linux_dma_resv_lock_slow 82 #define dma_resv_lock_slow_interruptible linux_dma_resv_lock_slow_interruptible 83 #define dma_resv_locking_ctx linux_dma_resv_locking_ctx 84 #define dma_resv_reserve_shared linux_dma_resv_reserve_shared 85 #define dma_resv_test_signaled_rcu linux_dma_resv_test_signaled_rcu 86 #define dma_resv_trylock linux_dma_resv_trylock 87 #define dma_resv_unlock linux_dma_resv_unlock 88 #define dma_resv_wait_timeout_rcu linux_dma_resv_wait_timeout_rcu 89 #define dma_resv_poll_fini linux_dma_resv_poll_fini 90 #define dma_resv_poll_init linux_dma_resv_poll_init 91 #define reservation_ww_class linux_reservation_ww_class 92 93 extern struct ww_class reservation_ww_class; 94 95 void dma_resv_init(struct dma_resv *); 96 void dma_resv_fini(struct dma_resv *); 97 int dma_resv_lock(struct dma_resv *, 98 struct ww_acquire_ctx *); 99 void dma_resv_lock_slow(struct dma_resv *, 100 struct ww_acquire_ctx *); 101 int dma_resv_lock_interruptible(struct dma_resv *, 102 struct ww_acquire_ctx *); 103 int dma_resv_lock_slow_interruptible(struct dma_resv *, 104 struct ww_acquire_ctx *); 105 bool dma_resv_trylock(struct dma_resv *) __must_check; 106 struct ww_acquire_ctx * 107 dma_resv_locking_ctx(struct dma_resv *); 108 void dma_resv_unlock(struct dma_resv *); 109 bool dma_resv_is_locked(struct dma_resv *); 110 bool dma_resv_held(struct dma_resv *); 111 void dma_resv_assert_held(struct dma_resv *); 112 struct dma_fence * 113 dma_resv_get_excl(struct dma_resv *); 114 struct dma_resv_list * 115 dma_resv_get_list(struct dma_resv *); 116 int dma_resv_reserve_shared(struct dma_resv *, unsigned int); 117 void dma_resv_add_excl_fence(struct dma_resv *, 118 struct dma_fence *); 119 void dma_resv_add_shared_fence(struct dma_resv *, 120 struct dma_fence *); 121 122 struct dma_fence * 123 dma_resv_get_excl_rcu(const struct dma_resv *); 124 int dma_resv_get_fences_rcu(const struct dma_resv *, 125 struct dma_fence **, unsigned *, struct dma_fence ***); 126 127 int dma_resv_copy_fences(struct dma_resv *, 128 const struct dma_resv *); 129 130 bool dma_resv_test_signaled_rcu(const struct dma_resv *, 131 bool); 132 long dma_resv_wait_timeout_rcu(const struct dma_resv *, 133 bool, bool, unsigned long); 134 135 /* NetBSD additions */ 136 void dma_resv_poll_init(struct dma_resv_poll *); 137 void dma_resv_poll_fini(struct dma_resv_poll *); 138 int dma_resv_do_poll(const struct dma_resv *, int, 139 struct dma_resv_poll *); 140 int dma_resv_kqfilter(const struct dma_resv *, 141 struct knote *, struct dma_resv_poll *); 142 143 static inline bool 144 dma_resv_has_excl_fence(const struct dma_resv *robj) 145 { 146 return robj->fence_excl != NULL; 147 } 148 149 #endif /* _LINUX_DMA_RESV_H_ */ 150
Indexes created Sat Sep 20 22:09:52 GMT 2025