diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/core/notify.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/core/notify.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/core/notify.c b/drivers/gpu/drm/nouveau/nvkm/core/notify.c new file mode 100644 index 000000000000..023610d01458 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/core/notify.c @@ -0,0 +1,163 @@ +/* + * Copyright 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. + * + * Authors: Ben Skeggs <bskeggs@redhat.com> + */ +#include <core/notify.h> +#include <core/event.h> + +static inline void +nvkm_notify_put_locked(struct nvkm_notify *notify) +{ + if (notify->block++ == 0) + nvkm_event_put(notify->event, notify->types, notify->index); +} + +void +nvkm_notify_put(struct nvkm_notify *notify) +{ + struct nvkm_event *event = notify->event; + unsigned long flags; + if (likely(event) && + test_and_clear_bit(NVKM_NOTIFY_USER, ¬ify->flags)) { + spin_lock_irqsave(&event->refs_lock, flags); + nvkm_notify_put_locked(notify); + spin_unlock_irqrestore(&event->refs_lock, flags); + if (test_bit(NVKM_NOTIFY_WORK, ¬ify->flags)) + flush_work(¬ify->work); + } +} + +static inline void +nvkm_notify_get_locked(struct nvkm_notify *notify) +{ + if (--notify->block == 0) + nvkm_event_get(notify->event, notify->types, notify->index); +} + +void +nvkm_notify_get(struct nvkm_notify *notify) +{ + struct nvkm_event *event = notify->event; + unsigned long flags; + if (likely(event) && + !test_and_set_bit(NVKM_NOTIFY_USER, ¬ify->flags)) { + spin_lock_irqsave(&event->refs_lock, flags); + nvkm_notify_get_locked(notify); + spin_unlock_irqrestore(&event->refs_lock, flags); + } +} + +static inline void +nvkm_notify_func(struct nvkm_notify *notify) +{ + struct nvkm_event *event = notify->event; + int ret = notify->func(notify); + unsigned long flags; + if ((ret == NVKM_NOTIFY_KEEP) || + !test_and_clear_bit(NVKM_NOTIFY_USER, ¬ify->flags)) { + spin_lock_irqsave(&event->refs_lock, flags); + nvkm_notify_get_locked(notify); + spin_unlock_irqrestore(&event->refs_lock, flags); + } +} + +static void +nvkm_notify_work(struct work_struct *work) +{ + struct nvkm_notify *notify = container_of(work, typeof(*notify), work); + nvkm_notify_func(notify); +} + +void +nvkm_notify_send(struct nvkm_notify *notify, void *data, u32 size) +{ + struct nvkm_event *event = notify->event; + unsigned long flags; + + assert_spin_locked(&event->list_lock); + BUG_ON(size != notify->size); + + spin_lock_irqsave(&event->refs_lock, flags); + if (notify->block) { + spin_unlock_irqrestore(&event->refs_lock, flags); + return; + } + nvkm_notify_put_locked(notify); + spin_unlock_irqrestore(&event->refs_lock, flags); + + if (test_bit(NVKM_NOTIFY_WORK, ¬ify->flags)) { + memcpy((void *)notify->data, data, size); + schedule_work(¬ify->work); + } else { + notify->data = data; + nvkm_notify_func(notify); + notify->data = NULL; + } +} + +void +nvkm_notify_fini(struct nvkm_notify *notify) +{ + unsigned long flags; + if (notify->event) { + nvkm_notify_put(notify); + spin_lock_irqsave(¬ify->event->list_lock, flags); + list_del(¬ify->head); + spin_unlock_irqrestore(¬ify->event->list_lock, flags); + kfree((void *)notify->data); + notify->event = NULL; + } +} + +int +nvkm_notify_init(struct nvkm_object *object, struct nvkm_event *event, + int (*func)(struct nvkm_notify *), bool work, + void *data, u32 size, u32 reply, + struct nvkm_notify *notify) +{ + unsigned long flags; + int ret = -ENODEV; + if ((notify->event = event), event->refs) { + ret = event->func->ctor(object, data, size, notify); + if (ret == 0 && (ret = -EINVAL, notify->size == reply)) { + notify->flags = 0; + notify->block = 1; + notify->func = func; + notify->data = NULL; + if (ret = 0, work) { + INIT_WORK(¬ify->work, nvkm_notify_work); + set_bit(NVKM_NOTIFY_WORK, ¬ify->flags); + notify->data = kmalloc(reply, GFP_KERNEL); + if (!notify->data) + ret = -ENOMEM; + } + } + if (ret == 0) { + spin_lock_irqsave(&event->list_lock, flags); + list_add_tail(¬ify->head, &event->list); + spin_unlock_irqrestore(&event->list_lock, flags); + } + } + if (ret) + notify->event = NULL; + return ret; +} |