1 files changed, 214 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/falcon/cmdq.c b/drivers/gpu/drm/nouveau/nvkm/falcon/cmdq.c
new file mode 100644
index 000000000000..40e3f3fc83ef
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/falcon/cmdq.c
@@ -0,0 +1,214 @@
+/*
+ * 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 bool
+nvkm_falcon_cmdq_has_room(struct nvkm_falcon_cmdq *cmdq, u32 size, bool *rewind)
+{
+	u32 head = nvkm_falcon_rd32(cmdq->qmgr->falcon, cmdq->head_reg);
+	u32 tail = nvkm_falcon_rd32(cmdq->qmgr->falcon, cmdq->tail_reg);
+	u32 free;
+
+	size = ALIGN(size, QUEUE_ALIGNMENT);
+
+	if (head >= tail) {
+		free = cmdq->offset + cmdq->size - head;
+		free -= HDR_SIZE;
+
+		if (size > free) {
+			*rewind = true;
+			head = cmdq->offset;
+		}
+	}
+
+	if (head < tail)
+		free = tail - head - 1;
+
+	return size <= free;
+}
+
+static void
+nvkm_falcon_cmdq_push(struct nvkm_falcon_cmdq *cmdq, void *data, u32 size)
+{
+	struct nvkm_falcon *falcon = cmdq->qmgr->falcon;
+	nvkm_falcon_load_dmem(falcon, data, cmdq->position, size, 0);
+	cmdq->position += ALIGN(size, QUEUE_ALIGNMENT);
+}
+
+static void
+nvkm_falcon_cmdq_rewind(struct nvkm_falcon_cmdq *cmdq)
+{
+	struct nv_falcon_cmd cmd;
+
+	cmd.unit_id = NV_FALCON_CMD_UNIT_ID_REWIND;
+	cmd.size = sizeof(cmd);
+	nvkm_falcon_cmdq_push(cmdq, &cmd, cmd.size);
+
+	cmdq->position = cmdq->offset;
+}
+
+static int
+nvkm_falcon_cmdq_open(struct nvkm_falcon_cmdq *cmdq, u32 size)
+{
+	struct nvkm_falcon *falcon = cmdq->qmgr->falcon;
+	bool rewind = false;
+
+	mutex_lock(&cmdq->mutex);
+
+	if (!nvkm_falcon_cmdq_has_room(cmdq, size, &rewind)) {
+		FLCNQ_DBG(cmdq, "queue full");
+		mutex_unlock(&cmdq->mutex);
+		return -EAGAIN;
+	}
+
+	cmdq->position = nvkm_falcon_rd32(falcon, cmdq->head_reg);
+
+	if (rewind)
+		nvkm_falcon_cmdq_rewind(cmdq);
+
+	return 0;
+}
+
+static void
+nvkm_falcon_cmdq_close(struct nvkm_falcon_cmdq *cmdq)
+{
+	nvkm_falcon_wr32(cmdq->qmgr->falcon, cmdq->head_reg, cmdq->position);
+	mutex_unlock(&cmdq->mutex);
+}
+
+static int
+nvkm_falcon_cmdq_write(struct nvkm_falcon_cmdq *cmdq, struct nv_falcon_cmd *cmd)
+{
+	static unsigned timeout = 2000;
+	unsigned long end_jiffies = jiffies + msecs_to_jiffies(timeout);
+	int ret = -EAGAIN;
+
+	while (ret == -EAGAIN && time_before(jiffies, end_jiffies))
+		ret = nvkm_falcon_cmdq_open(cmdq, cmd->size);
+	if (ret) {
+		FLCNQ_ERR(cmdq, "timeout waiting for queue space");
+		return ret;
+	}
+
+	nvkm_falcon_cmdq_push(cmdq, cmd, cmd->size);
+	nvkm_falcon_cmdq_close(cmdq);
+	return ret;
+}
+
+/* specifies that we want to know the command status in the answer message */
+#define CMD_FLAGS_STATUS BIT(0)
+/* specifies that we want an interrupt when the answer message is queued */
+#define CMD_FLAGS_INTR BIT(1)
+
+int
+nvkm_falcon_cmdq_send(struct nvkm_falcon_cmdq *cmdq, struct nv_falcon_cmd *cmd,
+		      nvkm_falcon_qmgr_callback cb, void *priv,
+		      unsigned long timeout)
+{
+	struct nvkm_falcon_qmgr_seq *seq;
+	int ret;
+
+	if (!wait_for_completion_timeout(&cmdq->ready,
+					 msecs_to_jiffies(1000))) {
+		FLCNQ_ERR(cmdq, "timeout waiting for queue ready");
+		return -ETIMEDOUT;
+	}
+
+	seq = nvkm_falcon_qmgr_seq_acquire(cmdq->qmgr);
+	if (IS_ERR(seq))
+		return PTR_ERR(seq);
+
+	cmd->seq_id = seq->id;
+	cmd->ctrl_flags = CMD_FLAGS_STATUS | CMD_FLAGS_INTR;
+
+	seq->state = SEQ_STATE_USED;
+	seq->async = !timeout;
+	seq->callback = cb;
+	seq->priv = priv;
+
+	ret = nvkm_falcon_cmdq_write(cmdq, cmd);
+	if (ret) {
+		seq->state = SEQ_STATE_PENDING;
+		nvkm_falcon_qmgr_seq_release(cmdq->qmgr, seq);
+		return ret;
+	}
+
+	if (!seq->async) {
+		if (!wait_for_completion_timeout(&seq->done, timeout)) {
+			FLCNQ_ERR(cmdq, "timeout waiting for reply");
+			return -ETIMEDOUT;
+		}
+		ret = seq->result;
+		nvkm_falcon_qmgr_seq_release(cmdq->qmgr, seq);
+	}
+
+	return ret;
+}
+
+void
+nvkm_falcon_cmdq_fini(struct nvkm_falcon_cmdq *cmdq)
+{
+	reinit_completion(&cmdq->ready);
+}
+
+void
+nvkm_falcon_cmdq_init(struct nvkm_falcon_cmdq *cmdq,
+		      u32 index, u32 offset, u32 size)
+{
+	const struct nvkm_falcon_func *func = cmdq->qmgr->falcon->func;
+
+	cmdq->head_reg = func->cmdq.head + index * func->cmdq.stride;
+	cmdq->tail_reg = func->cmdq.tail + index * func->cmdq.stride;
+	cmdq->offset = offset;
+	cmdq->size = size;
+	complete_all(&cmdq->ready);
+
+	FLCNQ_DBG(cmdq, "initialised @ index %d offset 0x%08x size 0x%08x",
+		  index, cmdq->offset, cmdq->size);
+}
+
+void
+nvkm_falcon_cmdq_del(struct nvkm_falcon_cmdq **pcmdq)
+{
+	struct nvkm_falcon_cmdq *cmdq = *pcmdq;
+	if (cmdq) {
+		kfree(*pcmdq);
+		*pcmdq = NULL;
+	}
+}
+
+int
+nvkm_falcon_cmdq_new(struct nvkm_falcon_qmgr *qmgr, const char *name,
+		     struct nvkm_falcon_cmdq **pcmdq)
+{
+	struct nvkm_falcon_cmdq *cmdq = *pcmdq;
+
+	if (!(cmdq = *pcmdq = kzalloc(sizeof(*cmdq), GFP_KERNEL)))
+		return -ENOMEM;
+
+	cmdq->qmgr = qmgr;
+	cmdq->name = name;
+	mutex_init(&cmdq->mutex);
+	init_completion(&cmdq->ready);
+	return 0;
+}