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path: root/drivers/gpu/drm/nouveau/nvif/notify.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nvif/notify.c')
-rw-r--r--drivers/gpu/drm/nouveau/nvif/notify.c210
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(&notify->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, &notify->flags)) {
+ int ret = nvif_notify_put_(notify);
+ if (test_bit(NVIF_NOTIFY_WORK, &notify->flags))
+ flush_work(&notify->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(&notify->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, &notify->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, &notify->flags)) {
+ if (!keep)
+ atomic_dec(&notify->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(&notify->putcnt);
+ if (test_bit(NVIF_NOTIFY_WORK, &notify->flags)) {
+ memcpy((void *)notify->data, data, size);
+ schedule_work(&notify->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(&notify->putcnt, 1);
+ notify->func = func;
+ notify->data = NULL;
+ notify->size = reply;
+ if (work) {
+ INIT_WORK(&notify->work, nvif_notify_work);
+ set_bit(NVIF_NOTIFY_WORK, &notify->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;
+}