diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvif/notify.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvif/notify.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvif/notify.c b/drivers/gpu/drm/nouveau/nvif/notify.c new file mode 100644 index 000000000..143c8dc68 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvif/notify.c @@ -0,0 +1,210 @@ +/* + * 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 <nvif/client.h> +#include <nvif/driver.h> +#include <nvif/notify.h> +#include <nvif/object.h> +#include <nvif/ioctl.h> +#include <nvif/event.h> + +static inline int +nvif_notify_put_(struct nvif_notify *notify) +{ + struct nvif_object *object = notify->object; + struct { + struct nvif_ioctl_v0 ioctl; + struct nvif_ioctl_ntfy_put_v0 ntfy; + } args = { + .ioctl.type = NVIF_IOCTL_V0_NTFY_PUT, + .ntfy.index = notify->index, + }; + + if (atomic_inc_return(¬ify->putcnt) != 1) + return 0; + + return nvif_object_ioctl(object, &args, sizeof(args), NULL); +} + +int +nvif_notify_put(struct nvif_notify *notify) +{ + if (likely(notify->object) && + test_and_clear_bit(NVIF_NOTIFY_USER, ¬ify->flags)) { + int ret = nvif_notify_put_(notify); + if (test_bit(NVIF_NOTIFY_WORK, ¬ify->flags)) + flush_work(¬ify->work); + return ret; + } + return 0; +} + +static inline int +nvif_notify_get_(struct nvif_notify *notify) +{ + struct nvif_object *object = notify->object; + struct { + struct nvif_ioctl_v0 ioctl; + struct nvif_ioctl_ntfy_get_v0 ntfy; + } args = { + .ioctl.type = NVIF_IOCTL_V0_NTFY_GET, + .ntfy.index = notify->index, + }; + + if (atomic_dec_return(¬ify->putcnt) != 0) + return 0; + + return nvif_object_ioctl(object, &args, sizeof(args), NULL); +} + +int +nvif_notify_get(struct nvif_notify *notify) +{ + if (likely(notify->object) && + !test_and_set_bit(NVIF_NOTIFY_USER, ¬ify->flags)) + return nvif_notify_get_(notify); + return 0; +} + +static inline int +nvif_notify_func(struct nvif_notify *notify, bool keep) +{ + int ret = notify->func(notify); + if (ret == NVIF_NOTIFY_KEEP || + !test_and_clear_bit(NVIF_NOTIFY_USER, ¬ify->flags)) { + if (!keep) + atomic_dec(¬ify->putcnt); + else + nvif_notify_get_(notify); + } + return ret; +} + +static void +nvif_notify_work(struct work_struct *work) +{ + struct nvif_notify *notify = container_of(work, typeof(*notify), work); + nvif_notify_func(notify, true); +} + +int +nvif_notify(const void *header, u32 length, const void *data, u32 size) +{ + struct nvif_notify *notify = NULL; + const union { + struct nvif_notify_rep_v0 v0; + } *args = header; + int ret = NVIF_NOTIFY_DROP; + + if (length == sizeof(args->v0) && args->v0.version == 0) { + if (WARN_ON(args->v0.route)) + return NVIF_NOTIFY_DROP; + notify = (void *)(unsigned long)args->v0.token; + } + + if (!WARN_ON(notify == NULL)) { + struct nvif_client *client = notify->object->client; + if (!WARN_ON(notify->size != size)) { + atomic_inc(¬ify->putcnt); + if (test_bit(NVIF_NOTIFY_WORK, ¬ify->flags)) { + memcpy((void *)notify->data, data, size); + schedule_work(¬ify->work); + return NVIF_NOTIFY_DROP; + } + notify->data = data; + ret = nvif_notify_func(notify, client->driver->keep); + notify->data = NULL; + } + } + + return ret; +} + +int +nvif_notify_dtor(struct nvif_notify *notify) +{ + struct nvif_object *object = notify->object; + struct { + struct nvif_ioctl_v0 ioctl; + struct nvif_ioctl_ntfy_del_v0 ntfy; + } args = { + .ioctl.type = NVIF_IOCTL_V0_NTFY_DEL, + .ntfy.index = notify->index, + }; + int ret = nvif_notify_put(notify); + if (ret >= 0 && object) { + ret = nvif_object_ioctl(object, &args, sizeof(args), NULL); + notify->object = NULL; + kfree((void *)notify->data); + } + return ret; +} + +int +nvif_notify_ctor(struct nvif_object *object, const char *name, + int (*func)(struct nvif_notify *), bool work, u8 event, + void *data, u32 size, u32 reply, struct nvif_notify *notify) +{ + struct { + struct nvif_ioctl_v0 ioctl; + struct nvif_ioctl_ntfy_new_v0 ntfy; + struct nvif_notify_req_v0 req; + } *args; + int ret = -ENOMEM; + + notify->object = object; + notify->name = name ? name : "nvifNotify"; + notify->flags = 0; + atomic_set(¬ify->putcnt, 1); + notify->func = func; + notify->data = NULL; + notify->size = reply; + if (work) { + INIT_WORK(¬ify->work, nvif_notify_work); + set_bit(NVIF_NOTIFY_WORK, ¬ify->flags); + notify->data = kmalloc(notify->size, GFP_KERNEL); + if (!notify->data) + goto done; + } + + if (!(args = kmalloc(sizeof(*args) + size, GFP_KERNEL))) + goto done; + args->ioctl.version = 0; + args->ioctl.type = NVIF_IOCTL_V0_NTFY_NEW; + args->ntfy.version = 0; + args->ntfy.event = event; + args->req.version = 0; + args->req.reply = notify->size; + args->req.route = 0; + args->req.token = (unsigned long)(void *)notify; + + memcpy(args->req.data, data, size); + ret = nvif_object_ioctl(object, args, sizeof(*args) + size, NULL); + notify->index = args->ntfy.index; + kfree(args); +done: + if (ret) + nvif_notify_dtor(notify); + return ret; +} |