drivers/gpu/drm/exynos/exynos_drm_buf.c

   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 <drm/drmP.h>
  27 #include <drm/exynos_drm.h>
  28
  29 #include "exynos_drm_drv.h"
  30 #include "exynos_drm_gem.h"
  31 #include "exynos_drm_buf.h"
  32
  33 static int lowlevel_buffer_allocate(struct drm_device *dev,
  34                 unsigned int flags, struct exynos_drm_gem_buf *buf)
  35 {
  36         dma_addr_t start_addr;
  37         unsigned int npages, i = 0;
  38         struct scatterlist *sgl;
  39         int ret = 0;
  40
  41         DRM_DEBUG_KMS("%s\n", __FILE__);
  42
  43         if (IS_NONCONTIG_BUFFER(flags)) {
  44                 DRM_DEBUG_KMS("not support allocation type.\n");
  45                 return -EINVAL;
  46         }
  47
  48         if (buf->dma_addr) {
  49                 DRM_DEBUG_KMS("already allocated.\n");
  50                 return 0;
  51         }
  52
  53         if (buf->size >= SZ_1M) {
  54                 npages = buf->size >> SECTION_SHIFT;
  55                 buf->page_size = SECTION_SIZE;
  56         } else if (buf->size >= SZ_64K) {
  57                 npages = buf->size >> 16;
  58                 buf->page_size = SZ_64K;
  59         } else {
  60                 npages = buf->size >> PAGE_SHIFT;
  61                 buf->page_size = PAGE_SIZE;
  62         }
  63
  64         buf->sgt = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
  65         if (!buf->sgt) {
  66                 DRM_ERROR("failed to allocate sg table.\n");
  67                 return -ENOMEM;
  68         }
  69
  70         ret = sg_alloc_table(buf->sgt, npages, GFP_KERNEL);
  71         if (ret < 0) {
  72                 DRM_ERROR("failed to initialize sg table.\n");
  73                 kfree(buf->sgt);
  74                 buf->sgt = NULL;
  75                 return -ENOMEM;
  76         }
  77
  78         buf->kvaddr = dma_alloc_writecombine(dev->dev, buf->size,
  79                         &buf->dma_addr, GFP_KERNEL);
  80         if (!buf->kvaddr) {
  81                 DRM_ERROR("failed to allocate buffer.\n");
  82                 ret = -ENOMEM;
  83                 goto err1;
  84         }
  85
  86         buf->pages = kzalloc(sizeof(struct page) * npages, GFP_KERNEL);
  87         if (!buf->pages) {
  88                 DRM_ERROR("failed to allocate pages.\n");
  89                 ret = -ENOMEM;
  90                 goto err2;
  91         }
  92
  93         sgl = buf->sgt->sgl;
  94         start_addr = buf->dma_addr;
  95
  96         while (i < npages) {
  97                 buf->pages[i] = phys_to_page(start_addr);
  98                 sg_set_page(sgl, buf->pages[i], buf->page_size, 0);
  99                 sg_dma_address(sgl) = start_addr;
 100                 start_addr += buf->page_size;
 101                 sgl = sg_next(sgl);
 102                 i++;
 103         }
 104
 105         DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
 106                         (unsigned long)buf->kvaddr,
 107                         (unsigned long)buf->dma_addr,
 108                         buf->size);
 109
 110         return ret;
 111 err2:
 112         dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
 113                         (dma_addr_t)buf->dma_addr);
 114         buf->dma_addr = (dma_addr_t)NULL;
 115 err1:
 116         sg_free_table(buf->sgt);
 117         kfree(buf->sgt);
 118         buf->sgt = NULL;
 119
 120         return ret;
 121 }
 122
 123 static void lowlevel_buffer_deallocate(struct drm_device *dev,
 124                 unsigned int flags, struct exynos_drm_gem_buf *buf)
 125 {
 126         DRM_DEBUG_KMS("%s.\n", __FILE__);
 127
 128         /*
 129          * release only physically continuous memory and
 130          * non-continuous memory would be released by exynos
 131          * gem framework.
 132          */
 133         if (IS_NONCONTIG_BUFFER(flags)) {
 134                 DRM_DEBUG_KMS("not support allocation type.\n");
 135                 return;
 136         }
 137
 138         if (!buf->dma_addr) {
 139                 DRM_DEBUG_KMS("dma_addr is invalid.\n");
 140                 return;
 141         }
 142
 143         DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
 144                         (unsigned long)buf->kvaddr,
 145                         (unsigned long)buf->dma_addr,
 146                         buf->size);
 147
 148         sg_free_table(buf->sgt);
 149
 150         kfree(buf->sgt);
 151         buf->sgt = NULL;
 152
 153         kfree(buf->pages);
 154         buf->pages = NULL;
 155
 156         dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
 157                                 (dma_addr_t)buf->dma_addr);
 158         buf->dma_addr = (dma_addr_t)NULL;
 159 }
 160
 161 struct exynos_drm_gem_buf *exynos_drm_init_buf(struct drm_device *dev,
 162                                                 unsigned int size)
 163 {
 164         struct exynos_drm_gem_buf *buffer;
 165
 166         DRM_DEBUG_KMS("%s.\n", __FILE__);
 167         DRM_DEBUG_KMS("desired size = 0x%x\n", size);
 168
 169         buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
 170         if (!buffer) {
 171                 DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
 172                 return NULL;
 173         }
 174
 175         buffer->size = size;
 176         return buffer;
 177 }
 178
 179 void exynos_drm_fini_buf(struct drm_device *dev,
 180                                 struct exynos_drm_gem_buf *buffer)
 181 {
 182         DRM_DEBUG_KMS("%s.\n", __FILE__);
 183
 184         if (!buffer) {
 185                 DRM_DEBUG_KMS("buffer is null.\n");
 186                 return;
 187         }
 188
 189         kfree(buffer);
 190         buffer = NULL;
 191 }
 192
 193 int exynos_drm_alloc_buf(struct drm_device *dev,
 194                 struct exynos_drm_gem_buf *buf, unsigned int flags)
 195 {
 196
 197         /*
 198          * allocate memory region and set the memory information
 199          * to vaddr and dma_addr of a buffer object.
 200          */
 201         if (lowlevel_buffer_allocate(dev, flags, buf) < 0)
 202                 return -ENOMEM;
 203
 204         return 0;
 205 }
 206
 207 void exynos_drm_free_buf(struct drm_device *dev,
 208                 unsigned int flags, struct exynos_drm_gem_buf *buffer)
 209 {
 210
 211         lowlevel_buffer_deallocate(dev, flags, buffer);
 212 }