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/* 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);
}
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