uevent.c

  1/*
  2 * Copyright 2021 Red Hat Inc.
  3 *
  4 * Permission is hereby granted, free of charge, to any person obtaining a
  5 * copy of this software and associated documentation files (the "Software"),
  6 * to deal in the Software without restriction, including without limitation
  7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8 * and/or sell copies of the Software, and to permit persons to whom the
  9 * Software is furnished to do so, subject to the following conditions:
 10 *
 11 * The above copyright notice and this permission notice shall be included in
 12 * all copies or substantial portions of the Software.
 13 *
 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 20 * OTHER DEALINGS IN THE SOFTWARE.
 21 */
 22#define nvkm_uevent(p) container_of((p), struct nvkm_uevent, object)
 23#include <core/event.h>
 24#include <core/client.h>
 25
 26#include <nvif/if000e.h>
 27
 28struct nvkm_uevent {
 29	struct nvkm_object object;
 30	struct nvkm_object *parent;
 31	nvkm_uevent_func func;
 32	bool wait;
 33
 34	struct nvkm_event_ntfy ntfy;
 35	atomic_t allowed;
 36};
 37
 38static int
 39nvkm_uevent_mthd_block(struct nvkm_uevent *uevent, union nvif_event_block_args *args, u32 argc)
 40{
 41	if (argc != sizeof(args->vn))
 42		return -ENOSYS;
 43
 44	nvkm_event_ntfy_block(&uevent->ntfy);
 45	atomic_set(&uevent->allowed, 0);
 46	return 0;
 47}
 48
 49static int
 50nvkm_uevent_mthd_allow(struct nvkm_uevent *uevent, union nvif_event_allow_args *args, u32 argc)
 51{
 52	if (argc != sizeof(args->vn))
 53		return -ENOSYS;
 54
 55	nvkm_event_ntfy_allow(&uevent->ntfy);
 56	atomic_set(&uevent->allowed, 1);
 57	return 0;
 58}
 59
 60static int
 61nvkm_uevent_mthd(struct nvkm_object *object, u32 mthd, void *argv, u32 argc)
 62{
 63	struct nvkm_uevent *uevent = nvkm_uevent(object);
 64
 65	switch (mthd) {
 66	case NVIF_EVENT_V0_ALLOW: return nvkm_uevent_mthd_allow(uevent, argv, argc);
 67	case NVIF_EVENT_V0_BLOCK: return nvkm_uevent_mthd_block(uevent, argv, argc);
 68	default:
 69		break;
 70	}
 71
 72	return -EINVAL;
 73}
 74
 75static int
 76nvkm_uevent_fini(struct nvkm_object *object, enum nvkm_suspend_state suspend)
 77{
 78	struct nvkm_uevent *uevent = nvkm_uevent(object);
 79
 80	nvkm_event_ntfy_block(&uevent->ntfy);
 81	return 0;
 82}
 83
 84static int
 85nvkm_uevent_init(struct nvkm_object *object)
 86{
 87	struct nvkm_uevent *uevent = nvkm_uevent(object);
 88
 89	if (atomic_read(&uevent->allowed))
 90		nvkm_event_ntfy_allow(&uevent->ntfy);
 91
 92	return 0;
 93}
 94
 95static void *
 96nvkm_uevent_dtor(struct nvkm_object *object)
 97{
 98	struct nvkm_uevent *uevent = nvkm_uevent(object);
 99
100	nvkm_event_ntfy_del(&uevent->ntfy);
101	return uevent;
102}
103
104static const struct nvkm_object_func
105nvkm_uevent = {
106	.dtor = nvkm_uevent_dtor,
107	.init = nvkm_uevent_init,
108	.fini = nvkm_uevent_fini,
109	.mthd = nvkm_uevent_mthd,
110};
111
112static int
113nvkm_uevent_ntfy(struct nvkm_event_ntfy *ntfy, u32 bits)
114{
115	struct nvkm_uevent *uevent = container_of(ntfy, typeof(*uevent), ntfy);
116	struct nvkm_client *client = uevent->object.client;
117
118	if (uevent->func)
119		return uevent->func(uevent->parent, uevent->object.object, bits);
120
121	return client->event(uevent->object.object, NULL, 0);
122}
123
124int
125nvkm_uevent_add(struct nvkm_uevent *uevent, struct nvkm_event *event, int id, u32 bits,
126		nvkm_uevent_func func)
127{
128	if (WARN_ON(uevent->func))
129		return -EBUSY;
130
131	nvkm_event_ntfy_add(event, id, bits, uevent->wait, nvkm_uevent_ntfy, &uevent->ntfy);
132	uevent->func = func;
133	return 0;
134}
135
136int
137nvkm_uevent_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
138		struct nvkm_object **pobject)
139{
140	struct nvkm_object *parent = oclass->parent;
141	struct nvkm_uevent *uevent;
142	union nvif_event_args *args = argv;
143
144	if (argc < sizeof(args->v0) || args->v0.version != 0)
145		return -ENOSYS;
146
147	if (!(uevent = kzalloc(sizeof(*uevent), GFP_KERNEL)))
148		return -ENOMEM;
149	*pobject = &uevent->object;
150
151	nvkm_object_ctor(&nvkm_uevent, oclass, &uevent->object);
152	uevent->parent = parent;
153	uevent->func = NULL;
154	uevent->wait = args->v0.wait;
155	uevent->ntfy.event = NULL;
156	return parent->func->uevent(parent, &args->v0.data, argc - sizeof(args->v0), uevent);
157}