[deliverable/linux.git] / drivers / gpu / drm / exynos / exynos_drm_buf.c

/* exynos_drm_buf.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Author: Inki Dae <inki.dae@samsung.com>
 *
 * 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
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS 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.
 */

#include "drmP.h"
#include "drm.h"
#include "exynos_drm.h"

#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_buf.h"

static int lowlevel_buffer_allocate(struct drm_device *dev,
		unsigned int flags, struct exynos_drm_gem_buf *buf)
{
	dma_addr_t start_addr;
	unsigned int npages, i = 0;
	struct scatterlist *sgl;
	int ret = 0;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (IS_NONCONTIG_BUFFER(flags)) {
		DRM_DEBUG_KMS("not support allocation type.\n");
		return -EINVAL;
	}

	if (buf->dma_addr) {
		DRM_DEBUG_KMS("already allocated.\n");
		return 0;
	}

	if (buf->size >= SZ_1M) {
		npages = buf->size >> SECTION_SHIFT;
		buf->page_size = SECTION_SIZE;
	} else if (buf->size >= SZ_64K) {
		npages = buf->size >> 16;
		buf->page_size = SZ_64K;
	} else {
		npages = buf->size >> PAGE_SHIFT;
		buf->page_size = PAGE_SIZE;
	}

	buf->sgt = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
	if (!buf->sgt) {
		DRM_ERROR("failed to allocate sg table.\n");
		return -ENOMEM;
	}

	ret = sg_alloc_table(buf->sgt, npages, GFP_KERNEL);
	if (ret < 0) {
		DRM_ERROR("failed to initialize sg table.\n");
		kfree(buf->sgt);
		buf->sgt = NULL;
		return -ENOMEM;
	}

	buf->kvaddr = dma_alloc_writecombine(dev->dev, buf->size,
			&buf->dma_addr, GFP_KERNEL);
	if (!buf->kvaddr) {
		DRM_ERROR("failed to allocate buffer.\n");
		ret = -ENOMEM;
		goto err1;
	}

	buf->pages = kzalloc(sizeof(struct page) * npages, GFP_KERNEL);
	if (!buf->pages) {
		DRM_ERROR("failed to allocate pages.\n");
		ret = -ENOMEM;
		goto err2;
	}

	sgl = buf->sgt->sgl;
	start_addr = buf->dma_addr;

	while (i < npages) {
		buf->pages[i] = phys_to_page(start_addr);
		sg_set_page(sgl, buf->pages[i], buf->page_size, 0);
		sg_dma_address(sgl) = start_addr;
		start_addr += buf->page_size;
		sgl = sg_next(sgl);
		i++;
	}

	DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
			(unsigned long)buf->kvaddr,
			(unsigned long)buf->dma_addr,
			buf->size);

	return ret;
err2:
	dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
			(dma_addr_t)buf->dma_addr);
	buf->dma_addr = (dma_addr_t)NULL;
err1:
	sg_free_table(buf->sgt);
	kfree(buf->sgt);
	buf->sgt = NULL;

	return ret;
}

static void lowlevel_buffer_deallocate(struct drm_device *dev,
		unsigned int flags, struct exynos_drm_gem_buf *buf)
{
	DRM_DEBUG_KMS("%s.\n", __FILE__);

	/*
	 * release only physically continuous memory and
	 * non-continuous memory would be released by exynos
	 * gem framework.
	 */
	if (IS_NONCONTIG_BUFFER(flags)) {
		DRM_DEBUG_KMS("not support allocation type.\n");
		return;
	}

	if (!buf->dma_addr) {
		DRM_DEBUG_KMS("dma_addr is invalid.\n");
		return;
	}

	DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
			(unsigned long)buf->kvaddr,
			(unsigned long)buf->dma_addr,
			buf->size);

	sg_free_table(buf->sgt);

	kfree(buf->sgt);
	buf->sgt = NULL;

	kfree(buf->pages);
	buf->pages = NULL;

	dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
				(dma_addr_t)buf->dma_addr);
	buf->dma_addr = (dma_addr_t)NULL;
}

struct exynos_drm_gem_buf *exynos_drm_init_buf(struct drm_device *dev,
						unsigned int size)
{
	struct exynos_drm_gem_buf *buffer;

	DRM_DEBUG_KMS("%s.\n", __FILE__);
	DRM_DEBUG_KMS("desired size = 0x%x\n", size);

	buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
	if (!buffer) {
		DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
		return NULL;
	}

	buffer->size = size;
	return buffer;
}

void exynos_drm_fini_buf(struct drm_device *dev,
				struct exynos_drm_gem_buf *buffer)
{
	DRM_DEBUG_KMS("%s.\n", __FILE__);

	if (!buffer) {
		DRM_DEBUG_KMS("buffer is null.\n");
		return;
	}

	kfree(buffer);
	buffer = NULL;
}

int exynos_drm_alloc_buf(struct drm_device *dev,
		struct exynos_drm_gem_buf *buf, unsigned int flags)
{

	/*
	 * allocate memory region and set the memory information
	 * to vaddr and dma_addr of a buffer object.
	 */
	if (lowlevel_buffer_allocate(dev, flags, buf) < 0)
		return -ENOMEM;

	return 0;
}

void exynos_drm_free_buf(struct drm_device *dev,
		unsigned int flags, struct exynos_drm_gem_buf *buffer)
{

	lowlevel_buffer_deallocate(dev, flags, buffer);
}
Commit	Line	Data
1c248b7d ID	1	/* exynos_drm_buf.c
	2	*
	3	* Copyright (c) 2011 Samsung Electronics Co., Ltd.
	4	* Author: Inki Dae <inki.dae@samsung.com>
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a
	7	* copy of this software and associated documentation files (the "Software"),
	8	* to deal in the Software without restriction, including without limitation
	9	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	10	* and/or sell copies of the Software, and to permit persons to whom the
	11	* Software is furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice (including the next
	14	* paragraph) shall be included in all copies or substantial portions of the
	15	* Software.
	16	*
	17	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	18	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	19	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	20	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	21	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	22	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	23	* OTHER DEALINGS IN THE SOFTWARE.
	24	*/
	25
	26	#include "drmP.h"
	27	#include "drm.h"
2b35892e	28	#include "exynos_drm.h"
1c248b7d ID	29
1c248b7d ID	30	#include "exynos_drm_drv.h"
2c871127	31	#include "exynos_drm_gem.h"
1c248b7d ID	32	#include "exynos_drm_buf.h"
1c248b7d ID	33
1c248b7d	34	static int lowlevel_buffer_allocate(struct drm_device *dev,
2b35892e	35	unsigned int flags, struct exynos_drm_gem_buf *buf)
1c248b7d	36	{
61db75d8	37	dma_addr_t start_addr;
b2df26c1	38	unsigned int npages, i = 0;
2b35892e ID	39	struct scatterlist *sgl;
	40	int ret = 0;
	41
1c248b7d ID	42	DRM_DEBUG_KMS("%s\n", __FILE__);
1c248b7d ID	43
dcf9af82	44	if (IS_NONCONTIG_BUFFER(flags)) {
2b35892e ID	45	DRM_DEBUG_KMS("not support allocation type.\n");
	46	return -EINVAL;
	47	}
	48
	49	if (buf->dma_addr) {
	50	DRM_DEBUG_KMS("already allocated.\n");
	51	return 0;
	52	}
	53
	54	if (buf->size >= SZ_1M) {
dcf9af82	55	npages = buf->size >> SECTION_SHIFT;
b2df26c1	56	buf->page_size = SECTION_SIZE;
2b35892e	57	} else if (buf->size >= SZ_64K) {
dcf9af82	58	npages = buf->size >> 16;
b2df26c1	59	buf->page_size = SZ_64K;
2b35892e	60	} else {
dcf9af82	61	npages = buf->size >> PAGE_SHIFT;
b2df26c1	62	buf->page_size = PAGE_SIZE;
2b35892e ID	63	}
	64
	65	buf->sgt = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
	66	if (!buf->sgt) {
	67	DRM_ERROR("failed to allocate sg table.\n");
1c248b7d ID	68	return -ENOMEM;
	69	}
	70
2b35892e ID	71	ret = sg_alloc_table(buf->sgt, npages, GFP_KERNEL);
	72	if (ret < 0) {
	73	DRM_ERROR("failed to initialize sg table.\n");
	74	kfree(buf->sgt);
	75	buf->sgt = NULL;
	76	return -ENOMEM;
	77	}
1c248b7d	78
61db75d8 ID	79	buf->kvaddr = dma_alloc_writecombine(dev->dev, buf->size,
	80	&buf->dma_addr, GFP_KERNEL);
	81	if (!buf->kvaddr) {
	82	DRM_ERROR("failed to allocate buffer.\n");
	83	ret = -ENOMEM;
	84	goto err1;
	85	}
2b35892e ID	86
	87	buf->pages = kzalloc(sizeof(struct page) * npages, GFP_KERNEL);
	88	if (!buf->pages) {
	89	DRM_ERROR("failed to allocate pages.\n");
	90	ret = -ENOMEM;
	91	goto err2;
	92	}
	93
	94	sgl = buf->sgt->sgl;
61db75d8	95	start_addr = buf->dma_addr;
2b35892e ID	96
	97	while (i < npages) {
	98	buf->pages[i] = phys_to_page(start_addr);
b2df26c1	99	sg_set_page(sgl, buf->pages[i], buf->page_size, 0);
2b35892e	100	sg_dma_address(sgl) = start_addr;
b2df26c1	101	start_addr += buf->page_size;
2b35892e ID	102	sgl = sg_next(sgl);
	103	i++;
	104	}
	105
2b35892e ID	106	DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
	107	(unsigned long)buf->kvaddr,
	108	(unsigned long)buf->dma_addr,
	109	buf->size);
	110
	111	return ret;
	112	err2:
	113	dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
	114	(dma_addr_t)buf->dma_addr);
	115	buf->dma_addr = (dma_addr_t)NULL;
	116	err1:
	117	sg_free_table(buf->sgt);
	118	kfree(buf->sgt);
	119	buf->sgt = NULL;
	120
	121	return ret;
1c248b7d ID	122	}
	123
	124	static void lowlevel_buffer_deallocate(struct drm_device *dev,
2b35892e	125	unsigned int flags, struct exynos_drm_gem_buf *buf)
1c248b7d ID	126	{
	127	DRM_DEBUG_KMS("%s.\n", __FILE__);
	128
2b35892e ID	129	/*
	130	* release only physically continuous memory and
	131	* non-continuous memory would be released by exynos
	132	* gem framework.
	133	*/
dcf9af82	134	if (IS_NONCONTIG_BUFFER(flags)) {
2b35892e ID	135	DRM_DEBUG_KMS("not support allocation type.\n");
	136	return;
	137	}
	138
	139	if (!buf->dma_addr) {
	140	DRM_DEBUG_KMS("dma_addr is invalid.\n");
	141	return;
	142	}
	143
	144	DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
	145	(unsigned long)buf->kvaddr,
	146	(unsigned long)buf->dma_addr,
	147	buf->size);
	148
	149	sg_free_table(buf->sgt);
	150
	151	kfree(buf->sgt);
	152	buf->sgt = NULL;
	153
	154	kfree(buf->pages);
	155	buf->pages = NULL;
	156
	157	dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
	158	(dma_addr_t)buf->dma_addr);
	159	buf->dma_addr = (dma_addr_t)NULL;
1c248b7d ID	160	}
1c248b7d ID	161
2b35892e ID	162	struct exynos_drm_gem_buf exynos_drm_init_buf(struct drm_device dev,
2b35892e ID	163	unsigned int size)
1c248b7d	164	{
2c871127	165	struct exynos_drm_gem_buf *buffer;
1c248b7d ID	166
1c248b7d ID	167	DRM_DEBUG_KMS("%s.\n", __FILE__);
2c871127	168	DRM_DEBUG_KMS("desired size = 0x%x\n", size);
1c248b7d	169
2c871127 ID	170	buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
	171	if (!buffer) {
	172	DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
ee5e770e	173	return NULL;
1c248b7d ID	174	}
1c248b7d ID	175
2c871127	176	buffer->size = size;
2c871127	177	return buffer;
1c248b7d ID	178	}
1c248b7d ID	179
2b35892e ID	180	void exynos_drm_fini_buf(struct drm_device *dev,
2b35892e ID	181	struct exynos_drm_gem_buf *buffer)
1c248b7d ID	182	{
	183	DRM_DEBUG_KMS("%s.\n", __FILE__);
	184
2c871127 ID	185	if (!buffer) {
2c871127 ID	186	DRM_DEBUG_KMS("buffer is null.\n");
1c248b7d ID	187	return;
	188	}
	189
2c871127 ID	190	kfree(buffer);
2c871127 ID	191	buffer = NULL;
1c248b7d ID	192	}
1c248b7d ID	193
2b35892e ID	194	int exynos_drm_alloc_buf(struct drm_device *dev,
	195	struct exynos_drm_gem_buf *buf, unsigned int flags)
	196	{
	197
	198	/*
	199	* allocate memory region and set the memory information
	200	* to vaddr and dma_addr of a buffer object.
	201	*/
	202	if (lowlevel_buffer_allocate(dev, flags, buf) < 0)
	203	return -ENOMEM;
	204
	205	return 0;
	206	}
	207
	208	void exynos_drm_free_buf(struct drm_device *dev,
	209	unsigned int flags, struct exynos_drm_gem_buf *buffer)
	210	{
	211
	212	lowlevel_buffer_deallocate(dev, flags, buffer);
	213	}