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 "drmP.h"
  27 #include "drm.h"
  28 #include "exynos_drm.h"
  29
  30 #include "exynos_drm_drv.h"
  31 #include "exynos_drm_gem.h"
  32 #include "exynos_drm_buf.h"
  33
  34 static int lowlevel_buffer_allocate(struct drm_device *dev,
  35                 unsigned int flags, struct exynos_drm_gem_buf *buf)
  36 {
  37         dma_addr_t start_addr;
  38         unsigned int npages, i = 0;
  39         struct scatterlist *sgl;
  40         int ret = 0;
  41
  42         DRM_DEBUG_KMS("%s\n", __FILE__);
  43
  44         if (IS_NONCONTIG_BUFFER(flags)) {
  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) {
  55                 npages = buf->size >> SECTION_SHIFT;
  56                 buf->page_size = SECTION_SIZE;
  57         } else if (buf->size >= SZ_64K) {
  58                 npages = buf->size >> 16;
  59                 buf->page_size = SZ_64K;
  60         } else {
  61                 npages = buf->size >> PAGE_SHIFT;
  62                 buf->page_size = PAGE_SIZE;
  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");
  68                 return -ENOMEM;
  69         }
  70
  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         }
  78
  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         }
  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;
  95         start_addr = buf->dma_addr;
  96
  97         while (i < npages) {
  98                 buf->pages[i] = phys_to_page(start_addr);
  99                 sg_set_page(sgl, buf->pages[i], buf->page_size, 0);
 100                 sg_dma_address(sgl) = start_addr;
 101                 start_addr += buf->page_size;
 102                 sgl = sg_next(sgl);
 103                 i++;
 104         }
 105
 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;
 122 }
 123
 124 static void lowlevel_buffer_deallocate(struct drm_device *dev,
 125                 unsigned int flags, struct exynos_drm_gem_buf *buf)
 126 {
 127         DRM_DEBUG_KMS("%s.\n", __FILE__);
 128
 129         /*
 130          * release only physically continuous memory and
 131          * non-continuous memory would be released by exynos
 132          * gem framework.
 133          */
 134         if (IS_NONCONTIG_BUFFER(flags)) {
 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;
 160 }
 161
 162 struct exynos_drm_gem_buf *exynos_drm_init_buf(struct drm_device *dev,
 163                                                 unsigned int size)
 164 {
 165         struct exynos_drm_gem_buf *buffer;
 166
 167         DRM_DEBUG_KMS("%s.\n", __FILE__);
 168         DRM_DEBUG_KMS("desired size = 0x%x\n", size);
 169
 170         buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
 171         if (!buffer) {
 172                 DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
 173                 return NULL;
 174         }
 175
 176         buffer->size = size;
 177         return buffer;
 178 }
 179
 180 void exynos_drm_fini_buf(struct drm_device *dev,
 181                                 struct exynos_drm_gem_buf *buffer)
 182 {
 183         DRM_DEBUG_KMS("%s.\n", __FILE__);
 184
 185         if (!buffer) {
 186                 DRM_DEBUG_KMS("buffer is null.\n");
 187                 return;
 188         }
 189
 190         kfree(buffer);
 191         buffer = NULL;
 192 }
 193
 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 }