/*

 * Copyright (C) 2014 Etnaviv Project

 *

 * 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 (including the next

 * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.

 *

 * Authors:

 *    Christian Gmeiner <christian.gmeiner@gmail.com>

 */

#include "etnaviv_priv.h"

#include "etnaviv_drmif.h"

drm_private pthread_mutex_t table_lock = PTHREAD_MUTEX_INITIALIZER;

drm_private void bo_del(struct etna_bo *bo);

/* set buffer name, and add to table, call w/ table_lock held: */

static void set_name(struct etna_bo *bo, uint32_t name)

{

	bo->name = name;

	/* add ourself into the name table: */

	drmHashInsert(bo->dev->name_table, name, bo);

}

/* Called under table_lock */

drm_private void bo_del(struct etna_bo *bo)

{

	if (bo->map)

		drm_munmap(bo->map, bo->size);

	if (bo->name)

		drmHashDelete(bo->dev->name_table, bo->name);

	if (bo->handle) {

		struct drm_gem_close req = {

			.handle = bo->handle,

		};

		drmHashDelete(bo->dev->handle_table, bo->handle);

		drmIoctl(bo->dev->fd, DRM_IOCTL_GEM_CLOSE, &req;;

	}

	free(bo);

}

/* lookup a buffer from it's handle, call w/ table_lock held: */

static struct etna_bo *lookup_bo(void *tbl, uint32_t handle)

{

	struct etna_bo *bo = NULL;

	if (!drmHashLookup(tbl, handle, (void **)&bo)) {

		/* found, incr refcnt and return: */

		bo = etna_bo_ref(bo);

		/* don't break the bucket if this bo was found in one */

		list_delinit(&bo->list);

	}

	return bo;

}

/* allocate a new buffer object, call w/ table_lock held */

static struct etna_bo *bo_from_handle(struct etna_device *dev,

		uint32_t size, uint32_t handle, uint32_t flags)

{

	struct etna_bo *bo = calloc(sizeof(*bo), 1);

	if (!bo) {

		struct drm_gem_close req = {

			.handle = handle,

		};

		drmIoctl(dev->fd, DRM_IOCTL_GEM_CLOSE, &req;;

		return NULL;

	}

	bo->dev = etna_device_ref(dev);

	bo->size = size;

	bo->handle = handle;

	bo->flags = flags;

	atomic_set(&bo->refcnt, 1);

	list_inithead(&bo->list);

	/* add ourselves to the handle table: */

	drmHashInsert(dev->handle_table, handle, bo);

	return bo;

}

/* allocate a new (un-tiled) buffer object */

drm_public struct etna_bo *etna_bo_new(struct etna_device *dev, uint32_t size,

		uint32_t flags)

{

	struct etna_bo *bo;

	int ret;

	struct drm_etnaviv_gem_new req = {

			.flags = flags,

	};

	bo = etna_bo_cache_alloc(&dev->bo_cache, &size, flags);

	if (bo)

		return bo;

	req.size = size;

	ret = drmCommandWriteRead(dev->fd, DRM_ETNAVIV_GEM_NEW,

			&req, sizeof(req));

	if (ret)

		return NULL;

	pthread_mutex_lock(&table_lock);

	bo = bo_from_handle(dev, size, req.handle, flags);

	bo->reuse = 1;

	pthread_mutex_unlock(&table_lock);

	return bo;

}

drm_public struct etna_bo *etna_bo_ref(struct etna_bo *bo)

{

	atomic_inc(&bo->refcnt);

	return bo;

}

/* get buffer info */

static int get_buffer_info(struct etna_bo *bo)

{

	int ret;

	struct drm_etnaviv_gem_info req = {

		.handle = bo->handle,

	};

	ret = drmCommandWriteRead(bo->dev->fd, DRM_ETNAVIV_GEM_INFO,

			&req, sizeof(req));

	if (ret) {

		return ret;

	}

	/* really all we need for now is mmap offset */

	bo->offset = req.offset;

	return 0;

}

/* import a buffer object from DRI2 name */

drm_public struct etna_bo *etna_bo_from_name(struct etna_device *dev,

		uint32_t name)

{

	struct etna_bo *bo;

	struct drm_gem_open req = {

		.name = name,

	};

	pthread_mutex_lock(&table_lock);

	/* check name table first, to see if bo is already open: */

	bo = lookup_bo(dev->name_table, name);

	if (bo)

		goto out_unlock;

	if (drmIoctl(dev->fd, DRM_IOCTL_GEM_OPEN, &req)) {

		ERROR_MSG("gem-open failed: %s", strerror(errno));

		goto out_unlock;

	}

	bo = lookup_bo(dev->handle_table, req.handle);

	if (bo)

		goto out_unlock;

	bo = bo_from_handle(dev, req.size, req.handle, 0);

	if (bo)

		set_name(bo, name);

out_unlock:

	pthread_mutex_unlock(&table_lock);

	return bo;

}

/* import a buffer from dmabuf fd, does not take ownership of the

 * fd so caller should close() the fd when it is otherwise done

 * with it (even if it is still using the 'struct etna_bo *')

 */

drm_public struct etna_bo *etna_bo_from_dmabuf(struct etna_device *dev, int fd)

{

	struct etna_bo *bo;

	int ret, size;

	uint32_t handle;

	/* take the lock before calling drmPrimeFDToHandle to avoid

	 * racing against etna_bo_del, which might invalidate the

	 * returned handle.

	 */

	pthread_mutex_lock(&table_lock);

	ret = drmPrimeFDToHandle(dev->fd, fd, &handle);

	if (ret) {

		pthread_mutex_unlock(&table_lock);

		return NULL;

	}

	bo = lookup_bo(dev->handle_table, handle);

	if (bo)

		goto out_unlock;

	/* lseek() to get bo size */

	size = lseek(fd, 0, SEEK_END);

	lseek(fd, 0, SEEK_CUR);

	bo = bo_from_handle(dev, size, handle, 0);

out_unlock:

	pthread_mutex_unlock(&table_lock);

	return bo;

}

/* destroy a buffer object */

drm_public void etna_bo_del(struct etna_bo *bo)

{

	struct etna_device *dev = bo->dev;

	if (!bo)

		return;

	if (!atomic_dec_and_test(&bo->refcnt))

		return;

	pthread_mutex_lock(&table_lock);

	if (bo->reuse && (etna_bo_cache_free(&dev->bo_cache, bo) == 0))

		goto out;

	bo_del(bo);

	etna_device_del_locked(dev);

out:

	pthread_mutex_unlock(&table_lock);

}

/* get the global flink/DRI2 buffer name */

drm_public int etna_bo_get_name(struct etna_bo *bo, uint32_t *name)

{

	if (!bo->name) {

		struct drm_gem_flink req = {

			.handle = bo->handle,

		};

		int ret;

		ret = drmIoctl(bo->dev->fd, DRM_IOCTL_GEM_FLINK, &req;;

		if (ret) {

			return ret;

		}

		pthread_mutex_lock(&table_lock);

		set_name(bo, req.name);

		pthread_mutex_unlock(&table_lock);

		bo->reuse = 0;

	}

	*name = bo->name;

	return 0;

}

drm_public uint32_t etna_bo_handle(struct etna_bo *bo)

{

	return bo->handle;

}

/* caller owns the dmabuf fd that is returned and is responsible

 * to close() it when done

 */

drm_public int etna_bo_dmabuf(struct etna_bo *bo)

{

	int ret, prime_fd;

	ret = drmPrimeHandleToFD(bo->dev->fd, bo->handle, DRM_CLOEXEC,

				&prime_fd);

	if (ret) {

		ERROR_MSG("failed to get dmabuf fd: %d", ret);

		return ret;

	}

	bo->reuse = 0;

	return prime_fd;

}

drm_public uint32_t etna_bo_size(struct etna_bo *bo)

{

	return bo->size;

}

drm_public void *etna_bo_map(struct etna_bo *bo)

{

	if (!bo->map) {

		if (!bo->offset) {

			get_buffer_info(bo);

		}

		bo->map = drm_mmap(0, bo->size, PROT_READ | PROT_WRITE,

				MAP_SHARED, bo->dev->fd, bo->offset);

		if (bo->map == MAP_FAILED) {

			ERROR_MSG("mmap failed: %s", strerror(errno));

			bo->map = NULL;

		}

	}

	return bo->map;

}

drm_public int etna_bo_cpu_prep(struct etna_bo *bo, uint32_t op)

{

	struct drm_etnaviv_gem_cpu_prep req = {

		.handle = bo->handle,

		.op = op,

	};

	get_abs_timeout(&req.timeout, 5000000000);

	return drmCommandWrite(bo->dev->fd, DRM_ETNAVIV_GEM_CPU_PREP,

			&req, sizeof(req));

}

drm_public void etna_bo_cpu_fini(struct etna_bo *bo)

{

	struct drm_etnaviv_gem_cpu_fini req = {

		.handle = bo->handle,

	};

	drmCommandWrite(bo->dev->fd, DRM_ETNAVIV_GEM_CPU_FINI,

			&req, sizeof(req));

}