drm/imagination: Implement context creation/destruction ioctls

Implement ioctls for the creation and destruction of contexts. Contexts are
used for job submission and each is associated with a particular job type.

Changes since v8:
- Fixed one error path in pvr_stream_process_1()
- Corrected license identifiers

Changes since v5:
- Fix context release in final error path in pvr_context_create()

Changes since v3:
- Use drm_dev_{enter,exit}

Co-developed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Sarah Walker <sarah.walker@imgtec.com>
Signed-off-by: Donald Robson <donald.robson@imgtec.com>
Link: https://lore.kernel.org/r/ac474a1f7dda2582d290798e4837140a2989aa2a.1700668843.git.donald.robson@imgtec.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>

1 files changed, 75 insertions, 0 deletions

diff --git a/drivers/gpu/drm/imagination/pvr_stream.h b/drivers/gpu/drm/imagination/pvr_stream.h
new file mode 100644
index 000000000000..d92acb3a61d7
--- /dev/null
+++ b/drivers/gpu/drm/imagination/pvr_stream.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
+/* Copyright (c) 2023 Imagination Technologies Ltd. */
+
+#ifndef PVR_STREAM_H
+#define PVR_STREAM_H
+
+#include <linux/bits.h>
+#include <linux/limits.h>
+#include <linux/types.h>
+
+struct pvr_device;
+
+struct pvr_job;
+
+enum pvr_stream_type {
+	PVR_STREAM_TYPE_GEOM = 0,
+	PVR_STREAM_TYPE_FRAG,
+	PVR_STREAM_TYPE_COMPUTE,
+	PVR_STREAM_TYPE_TRANSFER,
+	PVR_STREAM_TYPE_STATIC_RENDER_CONTEXT,
+	PVR_STREAM_TYPE_STATIC_COMPUTE_CONTEXT,
+
+	PVR_STREAM_TYPE_MAX
+};
+
+enum pvr_stream_size {
+	PVR_STREAM_SIZE_8 = 0,
+	PVR_STREAM_SIZE_16,
+	PVR_STREAM_SIZE_32,
+	PVR_STREAM_SIZE_64,
+	PVR_STREAM_SIZE_ARRAY,
+};
+
+#define PVR_FEATURE_NOT  BIT(31)
+#define PVR_FEATURE_NONE U32_MAX
+
+struct pvr_stream_def {
+	u32 offset;
+	enum pvr_stream_size size;
+	u32 array_size;
+	u32 feature;
+};
+
+struct pvr_stream_ext_def {
+	const struct pvr_stream_def *stream;
+	u32 stream_len;
+	u32 header_mask;
+	u32 quirk;
+};
+
+struct pvr_stream_ext_header {
+	const struct pvr_stream_ext_def *ext_streams;
+	u32 ext_streams_num;
+	u32 valid_mask;
+};
+
+struct pvr_stream_cmd_defs {
+	enum pvr_stream_type type;
+
+	const struct pvr_stream_def *main_stream;
+	u32 main_stream_len;
+
+	u32 ext_nr_headers;
+	const struct pvr_stream_ext_header *ext_headers;
+
+	size_t dest_size;
+};
+
+int
+pvr_stream_process(struct pvr_device *pvr_dev, const struct pvr_stream_cmd_defs *cmd_defs,
+		   void *stream, u32 stream_size, void *dest_out);
+void
+pvr_stream_create_musthave_masks(struct pvr_device *pvr_dev);
+
+#endif /* PVR_STREAM_H */