diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/core/event.c')
-rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/core/event.c | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/core/event.c b/drivers/gpu/drm/nouveau/nvkm/core/event.c new file mode 100644 index 000000000..61fed7792 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/core/event.c @@ -0,0 +1,214 @@ +/* + * Copyright 2013-2014 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 <core/event.h> +#include <core/subdev.h> + +static void +nvkm_event_put(struct nvkm_event *event, u32 types, int index) +{ + assert_spin_locked(&event->refs_lock); + + nvkm_trace(event->subdev, "event: decr %08x on %d\n", types, index); + + while (types) { + int type = __ffs(types); types &= ~(1 << type); + if (--event->refs[index * event->types_nr + type] == 0) { + nvkm_trace(event->subdev, "event: blocking %d on %d\n", type, index); + if (event->func->fini) + event->func->fini(event, 1 << type, index); + } + } +} + +static void +nvkm_event_get(struct nvkm_event *event, u32 types, int index) +{ + assert_spin_locked(&event->refs_lock); + + nvkm_trace(event->subdev, "event: incr %08x on %d\n", types, index); + + while (types) { + int type = __ffs(types); types &= ~(1 << type); + if (++event->refs[index * event->types_nr + type] == 1) { + nvkm_trace(event->subdev, "event: allowing %d on %d\n", type, index); + if (event->func->init) + event->func->init(event, 1 << type, index); + } + } +} + +static void +nvkm_event_ntfy_state(struct nvkm_event_ntfy *ntfy) +{ + struct nvkm_event *event = ntfy->event; + unsigned long flags; + + nvkm_trace(event->subdev, "event: ntfy state changed\n"); + spin_lock_irqsave(&event->refs_lock, flags); + + if (atomic_read(&ntfy->allowed) != ntfy->running) { + if (ntfy->running) { + nvkm_event_put(ntfy->event, ntfy->bits, ntfy->id); + ntfy->running = false; + } else { + nvkm_event_get(ntfy->event, ntfy->bits, ntfy->id); + ntfy->running = true; + } + } + + spin_unlock_irqrestore(&event->refs_lock, flags); +} + +static void +nvkm_event_ntfy_remove(struct nvkm_event_ntfy *ntfy) +{ + write_lock_irq(&ntfy->event->list_lock); + list_del_init(&ntfy->head); + write_unlock_irq(&ntfy->event->list_lock); +} + +static void +nvkm_event_ntfy_insert(struct nvkm_event_ntfy *ntfy) +{ + write_lock_irq(&ntfy->event->list_lock); + list_add_tail(&ntfy->head, &ntfy->event->ntfy); + write_unlock_irq(&ntfy->event->list_lock); +} + +static void +nvkm_event_ntfy_block_(struct nvkm_event_ntfy *ntfy, bool wait) +{ + struct nvkm_subdev *subdev = ntfy->event->subdev; + + nvkm_trace(subdev, "event: ntfy block %08x on %d wait:%d\n", ntfy->bits, ntfy->id, wait); + + if (atomic_xchg(&ntfy->allowed, 0) == 1) { + nvkm_event_ntfy_state(ntfy); + if (wait) + nvkm_event_ntfy_remove(ntfy); + } +} + +void +nvkm_event_ntfy_block(struct nvkm_event_ntfy *ntfy) +{ + if (ntfy->event) + nvkm_event_ntfy_block_(ntfy, ntfy->wait); +} + +void +nvkm_event_ntfy_allow(struct nvkm_event_ntfy *ntfy) +{ + nvkm_trace(ntfy->event->subdev, "event: ntfy allow %08x on %d\n", ntfy->bits, ntfy->id); + + if (atomic_xchg(&ntfy->allowed, 1) == 0) { + nvkm_event_ntfy_state(ntfy); + if (ntfy->wait) + nvkm_event_ntfy_insert(ntfy); + } +} + +void +nvkm_event_ntfy_del(struct nvkm_event_ntfy *ntfy) +{ + struct nvkm_event *event = ntfy->event; + + if (!event) + return; + + nvkm_trace(event->subdev, "event: ntfy del %08x on %d\n", ntfy->bits, ntfy->id); + + nvkm_event_ntfy_block_(ntfy, false); + nvkm_event_ntfy_remove(ntfy); + ntfy->event = NULL; +} + +void +nvkm_event_ntfy_add(struct nvkm_event *event, int id, u32 bits, bool wait, nvkm_event_func func, + struct nvkm_event_ntfy *ntfy) +{ + nvkm_trace(event->subdev, "event: ntfy add %08x on %d wait:%d\n", id, bits, wait); + + ntfy->event = event; + ntfy->id = id; + ntfy->bits = bits; + ntfy->wait = wait; + ntfy->func = func; + atomic_set(&ntfy->allowed, 0); + ntfy->running = false; + INIT_LIST_HEAD(&ntfy->head); + if (!ntfy->wait) + nvkm_event_ntfy_insert(ntfy); +} + +bool +nvkm_event_ntfy_valid(struct nvkm_event *event, int id, u32 bits) +{ + return true; +} + +void +nvkm_event_ntfy(struct nvkm_event *event, int id, u32 bits) +{ + struct nvkm_event_ntfy *ntfy, *ntmp; + unsigned long flags; + + if (!event->refs || WARN_ON(id >= event->index_nr)) + return; + + nvkm_trace(event->subdev, "event: ntfy %08x on %d\n", bits, id); + read_lock_irqsave(&event->list_lock, flags); + + list_for_each_entry_safe(ntfy, ntmp, &event->ntfy, head) { + if (ntfy->id == id && ntfy->bits & bits) { + if (atomic_read(&ntfy->allowed)) + ntfy->func(ntfy, ntfy->bits & bits); + } + } + + read_unlock_irqrestore(&event->list_lock, flags); +} + +void +nvkm_event_fini(struct nvkm_event *event) +{ + if (event->refs) { + kfree(event->refs); + event->refs = NULL; + } +} + +int +__nvkm_event_init(const struct nvkm_event_func *func, struct nvkm_subdev *subdev, + int types_nr, int index_nr, struct nvkm_event *event) +{ + event->refs = kzalloc(array3_size(index_nr, types_nr, sizeof(*event->refs)), GFP_KERNEL); + if (!event->refs) + return -ENOMEM; + + event->func = func; + event->subdev = subdev; + event->types_nr = types_nr; + event->index_nr = index_nr; + INIT_LIST_HEAD(&event->ntfy); + return 0; +} |