1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvif/chanc36f.c b/drivers/gpu/drm/nouveau/nvif/chanc36f.c
new file mode 100644
index 000000000000..ca02b939c3fd
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvif/chanc36f.c
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (c) 2025, NVIDIA CORPORATION. All rights reserved.
+ */
+#include <nvif/chan.h>
+#include <nvif/user.h>
+
+#include <nvif/push906f.h>
+#include <nvhw/class/clc36f.h>
+
+static void
+nvif_chanc36f_gpfifo_kick(struct nvif_chan *chan)
+{
+	struct nvif_user *usermode = chan->usermode;
+
+	nvif_wr32(&chan->userd, 0x8c, chan->gpfifo.cur);
+
+	wmb(); /* ensure CPU writes are flushed to BAR1 */
+	nvif_rd32(&chan->userd, 0); /* ensure BAR1 writes are flushed to vidmem */
+
+	usermode->func->doorbell(usermode, chan->doorbell_token);
+}
+
+#define NVIF_CHANC36F_SEM_RELEASE_SIZE 6
+
+static int
+nvif_chanc36f_sem_release(struct nvif_chan *chan, u64 addr, u32 data)
+{
+	struct nvif_push *push = &chan->push;
+	int ret;
+
+	ret = PUSH_WAIT(push, NVIF_CHANC36F_SEM_RELEASE_SIZE);
+	if (ret)
+		return ret;
+
+	PUSH_MTHD(push, NVC36F, SEM_ADDR_LO, lower_32_bits(addr),
+
+				SEM_ADDR_HI, upper_32_bits(addr),
+
+				SEM_PAYLOAD_LO, data);
+
+	PUSH_MTHD(push, NVC36F, SEM_EXECUTE,
+		  NVDEF(NVC36F, SEM_EXECUTE, OPERATION, RELEASE) |
+		  NVDEF(NVC36F, SEM_EXECUTE, RELEASE_WFI, DIS) |
+		  NVDEF(NVC36F, SEM_EXECUTE, PAYLOAD_SIZE, 32BIT) |
+		  NVDEF(NVC36F, SEM_EXECUTE, RELEASE_TIMESTAMP, DIS));
+
+	return 0;
+}
+
+static const struct nvif_chan_func
+nvif_chanc36f = {
+	.push.read_get = nvif_chan906f_read_get,
+	.gpfifo.read_get = nvif_chan906f_gpfifo_read_get,
+	.gpfifo.push = nvif_chan506f_gpfifo_push,
+	.gpfifo.kick = nvif_chanc36f_gpfifo_kick,
+	.gpfifo.post = nvif_chan906f_gpfifo_post,
+	.gpfifo.post_size = NVIF_CHANC36F_SEM_RELEASE_SIZE,
+	.sem.release = nvif_chanc36f_sem_release,
+};
+
+int
+nvif_chanc36f_ctor(struct nvif_chan *chan, void *userd, void *gpfifo, u32 gpfifo_size,
+		   void *push, u64 push_addr, u32 push_size, void *sema, u64 sema_addr,
+		   struct nvif_user *usermode, u32 doorbell_token)
+{
+	int ret;
+
+	ret = nvif_chan906f_ctor_(&nvif_chanc36f, userd, gpfifo, gpfifo_size,
+				  push, push_addr, push_size, sema, sema_addr, chan);
+	if (ret)
+		return ret;
+
+	chan->usermode = usermode;
+	chan->doorbell_token = doorbell_token;
+	return 0;
+}