1 files changed, 213 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/falcon/msgq.c b/drivers/gpu/drm/nouveau/nvkm/falcon/msgq.c
new file mode 100644
index 000000000000..cbfe09a561a1
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/falcon/msgq.c
@@ -0,0 +1,213 @@
+/*
+ * 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"
+
+static void
+nvkm_falcon_msgq_open(struct nvkm_falcon_msgq *msgq)
+{
+	mutex_lock(&msgq->mutex);
+	msgq->position = nvkm_falcon_rd32(msgq->qmgr->falcon, msgq->tail_reg);
+}
+
+static void
+nvkm_falcon_msgq_close(struct nvkm_falcon_msgq *msgq, bool commit)
+{
+	struct nvkm_falcon *falcon = msgq->qmgr->falcon;
+
+	if (commit)
+		nvkm_falcon_wr32(falcon, msgq->tail_reg, msgq->position);
+
+	mutex_unlock(&msgq->mutex);
+}
+
+static bool
+nvkm_falcon_msgq_empty(struct nvkm_falcon_msgq *msgq)
+{
+	u32 head = nvkm_falcon_rd32(msgq->qmgr->falcon, msgq->head_reg);
+	u32 tail = nvkm_falcon_rd32(msgq->qmgr->falcon, msgq->tail_reg);
+	return head == tail;
+}
+
+static int
+nvkm_falcon_msgq_pop(struct nvkm_falcon_msgq *msgq, void *data, u32 size)
+{
+	struct nvkm_falcon *falcon = msgq->qmgr->falcon;
+	u32 head, tail, available;
+
+	head = nvkm_falcon_rd32(falcon, msgq->head_reg);
+	/* has the buffer looped? */
+	if (head < msgq->position)
+		msgq->position = msgq->offset;
+
+	tail = msgq->position;
+
+	available = head - tail;
+	if (size > available) {
+		FLCNQ_ERR(msgq, "requested %d bytes, but only %d available",
+			  size, available);
+		return -EINVAL;
+	}
+
+	nvkm_falcon_read_dmem(falcon, tail, size, 0, data);
+	msgq->position += ALIGN(size, QUEUE_ALIGNMENT);
+	return 0;
+}
+
+static int
+nvkm_falcon_msgq_read(struct nvkm_falcon_msgq *msgq, struct nv_falcon_msg *hdr)
+{
+	int ret = 0;
+
+	nvkm_falcon_msgq_open(msgq);
+
+	if (nvkm_falcon_msgq_empty(msgq))
+		goto close;
+
+	ret = nvkm_falcon_msgq_pop(msgq, hdr, HDR_SIZE);
+	if (ret) {
+		FLCNQ_ERR(msgq, "failed to read message header");
+		goto close;
+	}
+
+	if (hdr->size > MSG_BUF_SIZE) {
+		FLCNQ_ERR(msgq, "message too big, %d bytes", hdr->size);
+		ret = -ENOSPC;
+		goto close;
+	}
+
+	if (hdr->size > HDR_SIZE) {
+		u32 read_size = hdr->size - HDR_SIZE;
+
+		ret = nvkm_falcon_msgq_pop(msgq, (hdr + 1), read_size);
+		if (ret) {
+			FLCNQ_ERR(msgq, "failed to read message data");
+			goto close;
+		}
+	}
+
+	ret = 1;
+close:
+	nvkm_falcon_msgq_close(msgq, (ret >= 0));
+	return ret;
+}
+
+static int
+nvkm_falcon_msgq_exec(struct nvkm_falcon_msgq *msgq, struct nv_falcon_msg *hdr)
+{
+	struct nvkm_falcon_qmgr_seq *seq;
+
+	seq = &msgq->qmgr->seq.id[hdr->seq_id];
+	if (seq->state != SEQ_STATE_USED && seq->state != SEQ_STATE_CANCELLED) {
+		FLCNQ_ERR(msgq, "message for unknown sequence %08x", seq->id);
+		return -EINVAL;
+	}
+
+	if (seq->state == SEQ_STATE_USED) {
+		if (seq->callback)
+			seq->result = seq->callback(seq->priv, hdr);
+	}
+
+	if (seq->async) {
+		nvkm_falcon_qmgr_seq_release(msgq->qmgr, seq);
+		return 0;
+	}
+
+	complete_all(&seq->done);
+	return 0;
+}
+
+void
+nvkm_falcon_msgq_recv(struct nvkm_falcon_msgq *msgq)
+{
+	/*
+	 * We are invoked from a worker thread, so normally we have plenty of
+	 * stack space to work with.
+	 */
+	u8 msg_buffer[MSG_BUF_SIZE];
+	struct nv_falcon_msg *hdr = (void *)msg_buffer;
+
+	while (nvkm_falcon_msgq_read(msgq, hdr) > 0)
+		nvkm_falcon_msgq_exec(msgq, hdr);
+}
+
+int
+nvkm_falcon_msgq_recv_initmsg(struct nvkm_falcon_msgq *msgq,
+			      void *data, u32 size)
+{
+	struct nvkm_falcon *falcon = msgq->qmgr->falcon;
+	struct nv_falcon_msg *hdr = data;
+	int ret;
+
+	msgq->head_reg = falcon->func->msgq.head;
+	msgq->tail_reg = falcon->func->msgq.tail;
+	msgq->offset = nvkm_falcon_rd32(falcon, falcon->func->msgq.tail);
+
+	nvkm_falcon_msgq_open(msgq);
+	ret = nvkm_falcon_msgq_pop(msgq, data, size);
+	if (ret == 0 && hdr->size != size) {
+		FLCN_ERR(falcon, "unexpected init message size %d vs %d",
+			 hdr->size, size);
+		ret = -EINVAL;
+	}
+	nvkm_falcon_msgq_close(msgq, ret == 0);
+	return ret;
+}
+
+void
+nvkm_falcon_msgq_init(struct nvkm_falcon_msgq *msgq,
+		      u32 index, u32 offset, u32 size)
+{
+	const struct nvkm_falcon_func *func = msgq->qmgr->falcon->func;
+
+	msgq->head_reg = func->msgq.head + index * func->msgq.stride;
+	msgq->tail_reg = func->msgq.tail + index * func->msgq.stride;
+	msgq->offset = offset;
+
+	FLCNQ_DBG(msgq, "initialised @ index %d offset 0x%08x size 0x%08x",
+		  index, msgq->offset, size);
+}
+
+void
+nvkm_falcon_msgq_del(struct nvkm_falcon_msgq **pmsgq)
+{
+	struct nvkm_falcon_msgq *msgq = *pmsgq;
+	if (msgq) {
+		kfree(*pmsgq);
+		*pmsgq = NULL;
+	}
+}
+
+int
+nvkm_falcon_msgq_new(struct nvkm_falcon_qmgr *qmgr, const char *name,
+		     struct nvkm_falcon_msgq **pmsgq)
+{
+	struct nvkm_falcon_msgq *msgq = *pmsgq;
+
+	if (!(msgq = *pmsgq = kzalloc(sizeof(*msgq), GFP_KERNEL)))
+		return -ENOMEM;
+
+	msgq->qmgr = qmgr;
+	msgq->name = name;
+	mutex_init(&msgq->mutex);
+	return 0;
+}