/*
 * Copyright 2013 Red Hat Inc.
 *
 * 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.
 *
 * Authors: Dave Airlie
 *          Alon Levy
 */

#include <linux/gfp.h>
#include <linux/slab.h>

#include "qxl_drv.h"
#include "qxl_object.h"

static int
qxl_allocate_chunk(struct qxl_device *qdev,
		   struct qxl_release *release,
		   struct qxl_drm_image *image,
		   unsigned int chunk_size)
{
	struct qxl_drm_chunk *chunk;
	int ret;

	chunk = kmalloc(sizeof(struct qxl_drm_chunk), GFP_KERNEL);
	if (!chunk)
		return -ENOMEM;

	ret = qxl_alloc_bo_reserved(qdev, release, chunk_size, &chunk->bo);
	if (ret) {
		kfree(chunk);
		return ret;
	}

	list_add_tail(&chunk->head, &image->chunk_list);
	return 0;
}

int
qxl_image_alloc_objects(struct qxl_device *qdev,
			struct qxl_release *release,
			struct qxl_drm_image **image_ptr,
			int height, int stride)
{
	struct qxl_drm_image *image;
	int ret;

	image = kmalloc(sizeof(struct qxl_drm_image), GFP_KERNEL);
	if (!image)
		return -ENOMEM;

	INIT_LIST_HEAD(&image->chunk_list);

	ret = qxl_alloc_bo_reserved(qdev, release, sizeof(struct qxl_image), &image->bo);
	if (ret) {
		kfree(image);
		return ret;
	}

	ret = qxl_allocate_chunk(qdev, release, image, sizeof(struct qxl_data_chunk) + stride * height);
	if (ret) {
		qxl_bo_unref(&image->bo);
		kfree(image);
		return ret;
	}
	*image_ptr = image;
	return 0;
}

void qxl_image_free_objects(struct qxl_device *qdev, struct qxl_drm_image *dimage)
{
	struct qxl_drm_chunk *chunk, *tmp;

	list_for_each_entry_safe(chunk, tmp, &dimage->chunk_list, head) {
		qxl_bo_unref(&chunk->bo);
		kfree(chunk);
	}

	qxl_bo_unref(&dimage->bo);
	kfree(dimage);
}

static int
qxl_image_init_helper(struct qxl_device *qdev,
		      struct qxl_release *release,
		      struct qxl_drm_image *dimage,
		      const uint8_t *data,
		      int width, int height,
		      int depth, unsigned int hash,
		      int stride)
{
	struct qxl_drm_chunk *drv_chunk;
	struct qxl_image *image;
	struct qxl_data_chunk *chunk;
	int i;
	int chunk_stride;
	int linesize = width * depth / 8;
	struct qxl_bo *chunk_bo, *image_bo;
	void *ptr;
	/* Chunk */
	/* FIXME: Check integer overflow */
	/* TODO: variable number of chunks */

	drv_chunk = list_first_entry(&dimage->chunk_list, struct qxl_drm_chunk, head);

	chunk_bo = drv_chunk->bo;
	chunk_stride = stride; /* TODO: should use linesize, but it renders
				  wrong (check the bitmaps are sent correctly
				  first) */

	ptr = qxl_bo_kmap_atomic_page(qdev, chunk_bo, 0);
	chunk = ptr;
	chunk->data_size = height * chunk_stride;
	chunk->prev_chunk = 0;
	chunk->next_chunk = 0;
	qxl_bo_kunmap_atomic_page(qdev, chunk_bo, ptr);

	{
		void *k_data, *i_data;
		int remain;
		int page;
		int size;

		if (stride == linesize && chunk_stride == stride) {
			remain = linesize * height;
			page = 0;
			i_data = (void *)data;

			while (remain > 0) {
				ptr = qxl_bo_kmap_atomic_page(qdev, chunk_bo, page << PAGE_SHIFT);

				if (page == 0) {
					chunk = ptr;
					k_data = chunk->data;
					size = PAGE_SIZE - offsetof(struct qxl_data_chunk, data);
				} else {
					k_data = ptr;
					size = PAGE_SIZE;
				}
				size = min(size, remain);

				memcpy(k_data, i_data, size);

				qxl_bo_kunmap_atomic_page(qdev, chunk_bo, ptr);
				i_data += size;
				remain -= size;
				page++;
			}
		} else {
			unsigned int page_base, page_offset, out_offset;

			for (i = 0 ; i < height ; ++i) {
				i_data = (void *)data + i * stride;
				remain = linesize;
				out_offset = offsetof(struct qxl_data_chunk, data) + i * chunk_stride;

				while (remain > 0) {
					page_base = out_offset & PAGE_MASK;
					page_offset = offset_in_page(out_offset);
					size = min((int)(PAGE_SIZE - page_offset), remain);

					ptr = qxl_bo_kmap_atomic_page(qdev, chunk_bo, page_base);
					k_data = ptr + page_offset;
					memcpy(k_data, i_data, size);
					qxl_bo_kunmap_atomic_page(qdev, chunk_bo, ptr);
					remain -= size;
					i_data += size;
					out_offset += size;
				}
			}
		}
	}
	qxl_bo_kunmap(chunk_bo);

	image_bo = dimage->bo;
	ptr = qxl_bo_kmap_atomic_page(qdev, image_bo, 0);
	image = ptr;

	image->descriptor.id = 0;
	image->descriptor.type = SPICE_IMAGE_TYPE_BITMAP;

	image->descriptor.flags = 0;
	image->descriptor.width = width;
	image->descriptor.height = height;

	switch (depth) {
	case 1:
		/* TODO: BE? check by arch? */
		image->u.bitmap.format = SPICE_BITMAP_FMT_1BIT_BE;
		break;
	case 24:
		image->u.bitmap.format = SPICE_BITMAP_FMT_24BIT;
		break;
	case 32:
		image->u.bitmap.format = SPICE_BITMAP_FMT_32BIT;
		break;
	default:
		DRM_ERROR("unsupported image bit depth\n");
		return -EINVAL; /* TODO: cleanup */
	}
	image->u.bitmap.flags = QXL_BITMAP_TOP_DOWN;
	image->u.bitmap.x = width;
	image->u.bitmap.y = height;
	image->u.bitmap.stride = chunk_stride;
	image->u.bitmap.palette = 0;
	image->u.bitmap.data = qxl_bo_physical_address(qdev, chunk_bo, 0);

	qxl_bo_kunmap_atomic_page(qdev, image_bo, ptr);

	return 0;
}

int qxl_image_init(struct qxl_device *qdev,
		     struct qxl_release *release,
		     struct qxl_drm_image *dimage,
		     const uint8_t *data,
		     int x, int y, int width, int height,
		     int depth, int stride)
{
	data += y * stride + x * (depth / 8);
	return qxl_image_init_helper(qdev, release, dimage, data,
				       width, height, depth, 0, stride);
}