drv_priv.h

/*
 * Copyright 2016 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef DRV_PRIV_H
#define DRV_PRIV_H


#include <stdint.h>
#include <stdlib.h>
#include <sys/types.h>
#include <stdatomic.h>

#include "drv.h"

#ifndef DISABLE_LOCK
#define ATOMIC_LOCK(X) \
while (atomic_flag_test_and_set(X)) { \
  }

#define ATOMIC_UNLOCK(X) \
  atomic_flag_clear(X);
#else
#define ATOMIC_LOCK(X) ((void)0)
#define ATOMIC_UNLOCK(X) ((void)0)
#endif

struct bo {
	struct driver *drv;
	uint32_t width;
	uint32_t height;
	uint32_t format;
	uint32_t tiling;
	size_t num_planes;
	union bo_handle handles[DRV_MAX_PLANES];
	uint32_t offsets[DRV_MAX_PLANES];
	uint32_t sizes[DRV_MAX_PLANES];
	uint32_t strides[DRV_MAX_PLANES];
	uint64_t format_modifiers[DRV_MAX_PLANES];
	uint64_t flags;
	size_t total_size;
	void *priv;
};

struct driver {
	int fd;
	struct backend *backend;
	void *priv;
	void *buffer_table;
	void *map_table;
	atomic_flag driver_lock;
};

struct kms_item {
	uint32_t format;
	uint64_t modifier;
	uint64_t usage;
};

struct format_metadata {
	uint32_t priority;
	uint32_t tiling;
	uint64_t modifier;
};

struct combination {
	uint32_t format;
	struct format_metadata metadata;
	uint64_t usage;
};

struct combinations {
	struct combination *data;
	uint32_t size;
	uint32_t allocations;
};

struct backend {
	char *name;
	int (*init)(struct driver *drv);
	void (*close)(struct driver *drv);
	int (*bo_create)(struct bo *bo, uint32_t width, uint32_t height, uint32_t format,
			 uint32_t flags);
	int (*bo_create_with_modifiers)(struct bo *bo, uint32_t width, uint32_t height,
					uint32_t format, const uint64_t *modifiers, uint32_t count);
	int (*bo_destroy)(struct bo *bo);
	int (*bo_import)(struct bo *bo, struct drv_import_fd_data *data);
	void *(*bo_map)(struct bo *bo, struct map_info *data, size_t plane, int prot);
	int (*bo_unmap)(struct bo *bo, struct map_info *data);
	uint32_t (*resolve_format)(uint32_t format, uint64_t usage);
	struct combinations combos;
};

// clang-format off
#define BO_USE_RENDER_MASK BO_USE_LINEAR | BO_USE_RENDERING | BO_USE_RENDERSCRIPT | \
			   BO_USE_SW_READ_OFTEN | BO_USE_SW_WRITE_OFTEN | BO_USE_SW_READ_RARELY | \
			   BO_USE_SW_WRITE_RARELY | BO_USE_TEXTURE

#define BO_USE_TEXTURE_MASK BO_USE_LINEAR | BO_USE_RENDERSCRIPT | BO_USE_SW_READ_OFTEN | \
			    BO_USE_SW_WRITE_OFTEN | BO_USE_SW_READ_RARELY | \
			    BO_USE_SW_WRITE_RARELY | BO_USE_TEXTURE

#define LINEAR_METADATA (struct format_metadata) { 0, 1, DRM_FORMAT_MOD_NONE }
// clang-format on

#endif