drm/nouveau/flcn: split msgqueue into multiple pieces

To make things clearer while modifying the interfaces, split msgqueue into
Queue Manager, Command Queue, and Message Queue.

There should be no code changes here, these will be done incrementally.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/falcon/qmgr.c b/drivers/gpu/drm/nouveau/nvkm/falcon/qmgr.c
new file mode 100644
index 000000000000..edf941559aec
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/falcon/qmgr.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
+ *
+ * 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 "qmgr.h"
+
+struct nvkm_msgqueue_seq *
+msgqueue_seq_acquire(struct nvkm_msgqueue *priv)
+{
+	const struct nvkm_subdev *subdev = priv->falcon->owner;
+	struct nvkm_msgqueue_seq *seq;
+	u32 index;
+
+	mutex_lock(&priv->seq_lock);
+	index = find_first_zero_bit(priv->seq_tbl, NVKM_MSGQUEUE_NUM_SEQUENCES);
+	if (index >= NVKM_MSGQUEUE_NUM_SEQUENCES) {
+		nvkm_error(subdev, "no free sequence available\n");
+		mutex_unlock(&priv->seq_lock);
+		return ERR_PTR(-EAGAIN);
+	}
+
+	set_bit(index, priv->seq_tbl);
+	mutex_unlock(&priv->seq_lock);
+
+	seq = &priv->seq[index];
+	seq->state = SEQ_STATE_PENDING;
+	return seq;
+}
+
+void
+msgqueue_seq_release(struct nvkm_msgqueue *priv, struct nvkm_msgqueue_seq *seq)
+{
+	/* no need to acquire seq_lock since clear_bit is atomic */
+	seq->state = SEQ_STATE_FREE;
+	seq->callback = NULL;
+	seq->completion = NULL;
+	clear_bit(seq->id, priv->seq_tbl);
+}