![Inki Dae](/assets/img/avatar_default.png)
with this patch, we can allocate physically continuous or non-continuous memory and also it creates scatterlist for iommu support so allocated memory region can be mapped to iommu page table using scatterlist. Signed-off-by: Inki Dae <inki.dae@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
233 lines
5.7 KiB
C
233 lines
5.7 KiB
C
/* exynos_drm_buf.c
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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* Author: Inki Dae <inki.dae@samsung.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "drmP.h"
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#include "drm.h"
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#include "exynos_drm.h"
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#include "exynos_drm_drv.h"
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#include "exynos_drm_gem.h"
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#include "exynos_drm_buf.h"
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static int lowlevel_buffer_allocate(struct drm_device *dev,
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unsigned int flags, struct exynos_drm_gem_buf *buf)
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{
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dma_addr_t start_addr, end_addr;
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unsigned int npages, page_size, i = 0;
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struct scatterlist *sgl;
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int ret = 0;
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DRM_DEBUG_KMS("%s\n", __FILE__);
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if (flags & EXYNOS_BO_NONCONTIG) {
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DRM_DEBUG_KMS("not support allocation type.\n");
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return -EINVAL;
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}
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if (buf->dma_addr) {
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DRM_DEBUG_KMS("already allocated.\n");
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return 0;
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}
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if (buf->size >= SZ_1M) {
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npages = (buf->size >> SECTION_SHIFT) + 1;
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page_size = SECTION_SIZE;
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} else if (buf->size >= SZ_64K) {
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npages = (buf->size >> 16) + 1;
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page_size = SZ_64K;
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} else {
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npages = (buf->size >> PAGE_SHIFT) + 1;
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page_size = PAGE_SIZE;
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}
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buf->sgt = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
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if (!buf->sgt) {
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DRM_ERROR("failed to allocate sg table.\n");
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return -ENOMEM;
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}
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ret = sg_alloc_table(buf->sgt, npages, GFP_KERNEL);
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if (ret < 0) {
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DRM_ERROR("failed to initialize sg table.\n");
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kfree(buf->sgt);
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buf->sgt = NULL;
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return -ENOMEM;
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}
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buf->kvaddr = dma_alloc_writecombine(dev->dev, buf->size,
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&buf->dma_addr, GFP_KERNEL);
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if (!buf->kvaddr) {
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DRM_ERROR("failed to allocate buffer.\n");
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ret = -ENOMEM;
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goto err1;
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}
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start_addr = buf->dma_addr;
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end_addr = buf->dma_addr + buf->size;
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buf->pages = kzalloc(sizeof(struct page) * npages, GFP_KERNEL);
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if (!buf->pages) {
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DRM_ERROR("failed to allocate pages.\n");
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ret = -ENOMEM;
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goto err2;
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}
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start_addr = buf->dma_addr;
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end_addr = buf->dma_addr + buf->size;
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buf->pages = kzalloc(sizeof(struct page) * npages, GFP_KERNEL);
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if (!buf->pages) {
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DRM_ERROR("failed to allocate pages.\n");
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ret = -ENOMEM;
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goto err2;
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}
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sgl = buf->sgt->sgl;
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while (i < npages) {
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buf->pages[i] = phys_to_page(start_addr);
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sg_set_page(sgl, buf->pages[i], page_size, 0);
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sg_dma_address(sgl) = start_addr;
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start_addr += page_size;
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if (end_addr - start_addr < page_size)
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break;
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sgl = sg_next(sgl);
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i++;
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}
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buf->pages[i] = phys_to_page(start_addr);
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sgl = sg_next(sgl);
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sg_set_page(sgl, buf->pages[i+1], end_addr - start_addr, 0);
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DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
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(unsigned long)buf->kvaddr,
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(unsigned long)buf->dma_addr,
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buf->size);
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return ret;
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err2:
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dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
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(dma_addr_t)buf->dma_addr);
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buf->dma_addr = (dma_addr_t)NULL;
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err1:
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sg_free_table(buf->sgt);
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kfree(buf->sgt);
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buf->sgt = NULL;
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return ret;
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}
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static void lowlevel_buffer_deallocate(struct drm_device *dev,
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unsigned int flags, struct exynos_drm_gem_buf *buf)
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{
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DRM_DEBUG_KMS("%s.\n", __FILE__);
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/*
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* release only physically continuous memory and
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* non-continuous memory would be released by exynos
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* gem framework.
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*/
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if (flags & EXYNOS_BO_NONCONTIG) {
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DRM_DEBUG_KMS("not support allocation type.\n");
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return;
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}
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if (!buf->dma_addr) {
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DRM_DEBUG_KMS("dma_addr is invalid.\n");
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return;
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}
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DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
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(unsigned long)buf->kvaddr,
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(unsigned long)buf->dma_addr,
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buf->size);
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sg_free_table(buf->sgt);
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kfree(buf->sgt);
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buf->sgt = NULL;
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kfree(buf->pages);
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buf->pages = NULL;
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dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
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(dma_addr_t)buf->dma_addr);
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buf->dma_addr = (dma_addr_t)NULL;
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}
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struct exynos_drm_gem_buf *exynos_drm_init_buf(struct drm_device *dev,
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unsigned int size)
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{
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struct exynos_drm_gem_buf *buffer;
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DRM_DEBUG_KMS("%s.\n", __FILE__);
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DRM_DEBUG_KMS("desired size = 0x%x\n", size);
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buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
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if (!buffer) {
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DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
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return NULL;
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}
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buffer->size = size;
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return buffer;
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}
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void exynos_drm_fini_buf(struct drm_device *dev,
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struct exynos_drm_gem_buf *buffer)
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{
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DRM_DEBUG_KMS("%s.\n", __FILE__);
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if (!buffer) {
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DRM_DEBUG_KMS("buffer is null.\n");
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return;
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}
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kfree(buffer);
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buffer = NULL;
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}
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int exynos_drm_alloc_buf(struct drm_device *dev,
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struct exynos_drm_gem_buf *buf, unsigned int flags)
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{
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/*
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* allocate memory region and set the memory information
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* to vaddr and dma_addr of a buffer object.
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*/
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if (lowlevel_buffer_allocate(dev, flags, buf) < 0)
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return -ENOMEM;
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return 0;
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}
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void exynos_drm_free_buf(struct drm_device *dev,
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unsigned int flags, struct exynos_drm_gem_buf *buffer)
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{
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lowlevel_buffer_deallocate(dev, flags, buffer);
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}
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