diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/engine/fifo/chid.c')
-rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/engine/fifo/chid.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chid.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chid.c new file mode 100644 index 000000000000..7c582bce7e24 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/chid.c @@ -0,0 +1,82 @@ +/* + * Copyright 2020 Red Hat Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ +#include "chid.h" + +static void +nvkm_chid_del(struct kref *kref) +{ + struct nvkm_chid *chid = container_of(kref, typeof(*chid), kref); + + nvkm_event_fini(&chid->event); + + kvfree(chid->data); + kfree(chid); +} + +void +nvkm_chid_unref(struct nvkm_chid **pchid) +{ + struct nvkm_chid *chid = *pchid; + + if (!chid) + return; + + kref_put(&chid->kref, nvkm_chid_del); + *pchid = NULL; +} + +struct nvkm_chid * +nvkm_chid_ref(struct nvkm_chid *chid) +{ + if (chid) + kref_get(&chid->kref); + + return chid; +} + +int +nvkm_chid_new(const struct nvkm_event_func *func, struct nvkm_subdev *subdev, + int nr, int first, int count, struct nvkm_chid **pchid) +{ + struct nvkm_chid *chid; + int id; + + if (!(chid = *pchid = kzalloc(struct_size(chid, used, nr), GFP_KERNEL))) + return -ENOMEM; + + kref_init(&chid->kref); + chid->nr = nr; + chid->mask = chid->nr - 1; + spin_lock_init(&chid->lock); + + if (!(chid->data = kvzalloc(sizeof(*chid->data) * nr, GFP_KERNEL))) { + nvkm_chid_unref(pchid); + return -ENOMEM; + } + + for (id = 0; id < first; id++) + __set_bit(id, chid->used); + for (id = first + count; id < nr; id++) + __set_bit(id, chid->used); + + return nvkm_event_init(func, subdev, 1, nr, &chid->event); +} |