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      1 /*	$NetBSD: nouveau_nvkm_core_event.c,v 1.4 2021/12/18 23:45:34 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2013-2014 Red Hat Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  */
     24 #include <sys/cdefs.h>
     25 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_core_event.c,v 1.4 2021/12/18 23:45:34 riastradh Exp $");
     26 
     27 #include <core/event.h>
     28 #include <core/notify.h>
     29 
     30 void
     31 nvkm_event_put(struct nvkm_event *event, u32 types, int index)
     32 {
     33 	assert_spin_locked(&event->refs_lock);
     34 	while (types) {
     35 		int type = __ffs(types); types &= ~(1 << type);
     36 		if (--event->refs[index * event->types_nr + type] == 0) {
     37 			if (event->func->fini)
     38 				event->func->fini(event, 1 << type, index);
     39 		}
     40 	}
     41 }
     42 
     43 void
     44 nvkm_event_get(struct nvkm_event *event, u32 types, int index)
     45 {
     46 	assert_spin_locked(&event->refs_lock);
     47 	while (types) {
     48 		int type = __ffs(types); types &= ~(1 << type);
     49 		if (++event->refs[index * event->types_nr + type] == 1) {
     50 			if (event->func->init)
     51 				event->func->init(event, 1 << type, index);
     52 		}
     53 	}
     54 }
     55 
     56 void
     57 nvkm_event_send(struct nvkm_event *event, u32 types, int index,
     58 		void *data, u32 size)
     59 {
     60 	struct nvkm_notify *notify;
     61 	unsigned long flags;
     62 
     63 	if (!event->refs || WARN_ON(index >= event->index_nr))
     64 		return;
     65 
     66 	spin_lock_irqsave(&event->list_lock, flags);
     67 	list_for_each_entry(notify, &event->list, head) {
     68 		if (notify->index == index && (notify->types & types)) {
     69 			if (event->func->send) {
     70 				event->func->send(data, size, notify);
     71 				continue;
     72 			}
     73 			nvkm_notify_send(notify, data, size);
     74 		}
     75 	}
     76 	spin_unlock_irqrestore(&event->list_lock, flags);
     77 }
     78 
     79 void
     80 nvkm_event_fini(struct nvkm_event *event)
     81 {
     82 	if (event->refs) {
     83 		kfree(event->refs);
     84 		event->refs = NULL;
     85 	}
     86 	spin_lock_destroy(&event->list_lock);
     87 	spin_lock_destroy(&event->refs_lock);
     88 }
     89 
     90 int
     91 nvkm_event_init(const struct nvkm_event_func *func, int types_nr, int index_nr,
     92 		struct nvkm_event *event)
     93 {
     94 	event->refs = kzalloc(array3_size(index_nr, types_nr,
     95 					  sizeof(*event->refs)),
     96 			      GFP_KERNEL);
     97 	if (!event->refs)
     98 		return -ENOMEM;
     99 
    100 	event->func = func;
    101 	event->types_nr = types_nr;
    102 	event->index_nr = index_nr;
    103 	spin_lock_init(&event->refs_lock);
    104 	spin_lock_init(&event->list_lock);
    105 	INIT_LIST_HEAD(&event->list);
    106 	return 0;
    107 }
    108