3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Author: Inki Dae <inki.dae@samsung.com>
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:
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
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.
28 #include "exynos_drm.h"
30 #include "exynos_drm_drv.h"
31 #include "exynos_drm_gem.h"
32 #include "exynos_drm_buf.h"
34 static int lowlevel_buffer_allocate(struct drm_device *dev,
35 unsigned int flags, struct exynos_drm_gem_buf *buf)
37 dma_addr_t start_addr, end_addr;
38 unsigned int npages, page_size, i = 0;
39 struct scatterlist *sgl;
42 DRM_DEBUG_KMS("%s\n", __FILE__);
44 if (flags & EXYNOS_BO_NONCONTIG) {
45 DRM_DEBUG_KMS("not support allocation type.\n");
50 DRM_DEBUG_KMS("already allocated.\n");
54 if (buf->size >= SZ_1M) {
55 npages = (buf->size >> SECTION_SHIFT) + 1;
56 page_size = SECTION_SIZE;
57 } else if (buf->size >= SZ_64K) {
58 npages = (buf->size >> 16) + 1;
61 npages = (buf->size >> PAGE_SHIFT) + 1;
62 page_size = PAGE_SIZE;
65 buf->sgt = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
67 DRM_ERROR("failed to allocate sg table.\n");
71 ret = sg_alloc_table(buf->sgt, npages, GFP_KERNEL);
73 DRM_ERROR("failed to initialize sg table.\n");
79 buf->kvaddr = dma_alloc_writecombine(dev->dev, buf->size,
80 &buf->dma_addr, GFP_KERNEL);
82 DRM_ERROR("failed to allocate buffer.\n");
87 start_addr = buf->dma_addr;
88 end_addr = buf->dma_addr + buf->size;
90 buf->pages = kzalloc(sizeof(struct page) * npages, GFP_KERNEL);
92 DRM_ERROR("failed to allocate pages.\n");
97 start_addr = buf->dma_addr;
98 end_addr = buf->dma_addr + buf->size;
100 buf->pages = kzalloc(sizeof(struct page) * npages, GFP_KERNEL);
102 DRM_ERROR("failed to allocate pages.\n");
110 buf->pages[i] = phys_to_page(start_addr);
111 sg_set_page(sgl, buf->pages[i], page_size, 0);
112 sg_dma_address(sgl) = start_addr;
113 start_addr += page_size;
114 if (end_addr - start_addr < page_size)
120 buf->pages[i] = phys_to_page(start_addr);
123 sg_set_page(sgl, buf->pages[i+1], end_addr - start_addr, 0);
125 DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
126 (unsigned long)buf->kvaddr,
127 (unsigned long)buf->dma_addr,
132 dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
133 (dma_addr_t)buf->dma_addr);
134 buf->dma_addr = (dma_addr_t)NULL;
136 sg_free_table(buf->sgt);
143 static void lowlevel_buffer_deallocate(struct drm_device *dev,
144 unsigned int flags, struct exynos_drm_gem_buf *buf)
146 DRM_DEBUG_KMS("%s.\n", __FILE__);
149 * release only physically continuous memory and
150 * non-continuous memory would be released by exynos
153 if (flags & EXYNOS_BO_NONCONTIG) {
154 DRM_DEBUG_KMS("not support allocation type.\n");
158 if (!buf->dma_addr) {
159 DRM_DEBUG_KMS("dma_addr is invalid.\n");
163 DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
164 (unsigned long)buf->kvaddr,
165 (unsigned long)buf->dma_addr,
168 sg_free_table(buf->sgt);
176 dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
177 (dma_addr_t)buf->dma_addr);
178 buf->dma_addr = (dma_addr_t)NULL;
181 struct exynos_drm_gem_buf *exynos_drm_init_buf(struct drm_device *dev,
184 struct exynos_drm_gem_buf *buffer;
186 DRM_DEBUG_KMS("%s.\n", __FILE__);
187 DRM_DEBUG_KMS("desired size = 0x%x\n", size);
189 buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
191 DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
199 void exynos_drm_fini_buf(struct drm_device *dev,
200 struct exynos_drm_gem_buf *buffer)
202 DRM_DEBUG_KMS("%s.\n", __FILE__);
205 DRM_DEBUG_KMS("buffer is null.\n");
213 int exynos_drm_alloc_buf(struct drm_device *dev,
214 struct exynos_drm_gem_buf *buf, unsigned int flags)
218 * allocate memory region and set the memory information
219 * to vaddr and dma_addr of a buffer object.
221 if (lowlevel_buffer_allocate(dev, flags, buf) < 0)
227 void exynos_drm_free_buf(struct drm_device *dev,
228 unsigned int flags, struct exynos_drm_gem_buf *buffer)
231 lowlevel_buffer_deallocate(dev, flags, buffer);