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, end_addr;
  38         unsigned int npages, page_size, 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                 page_size = SECTION_SIZE;
  57         } else if (buf->size >= SZ_64K) {
  58                 npages = buf->size >> 16;
  59                 page_size = SZ_64K;
  60         } else {
  61                 npages = buf->size >> PAGE_SHIFT;
  62                 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                 start_addr = buf->dma_addr;
  88                 end_addr = buf->dma_addr + buf->size;
  89
  90                 buf->pages = kzalloc(sizeof(struct page) * npages, GFP_KERNEL);
  91                 if (!buf->pages) {
  92                         DRM_ERROR("failed to allocate pages.\n");
  93                         ret = -ENOMEM;
  94                         goto err2;
  95                 }
  96
  97         start_addr = buf->dma_addr;
  98         end_addr = buf->dma_addr + buf->size;
  99
 100         buf->pages = kzalloc(sizeof(struct page) * npages, GFP_KERNEL);
 101         if (!buf->pages) {
 102                 DRM_ERROR("failed to allocate pages.\n");
 103                 ret = -ENOMEM;
 104                 goto err2;
 105         }
 106
 107         sgl = buf->sgt->sgl;
 108
 109         while (i < npages) {
 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)
 115                         break;
 116                 sgl = sg_next(sgl);
 117                 i++;
 118         }
 119
 120         buf->pages[i] = phys_to_page(start_addr);
 121
 122         DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
 123                         (unsigned long)buf->kvaddr,
 124                         (unsigned long)buf->dma_addr,
 125                         buf->size);
 126
 127         return ret;
 128 err2:
 129         dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
 130                         (dma_addr_t)buf->dma_addr);
 131         buf->dma_addr = (dma_addr_t)NULL;
 132 err1:
 133         sg_free_table(buf->sgt);
 134         kfree(buf->sgt);
 135         buf->sgt = NULL;
 136
 137         return ret;
 138 }
 139
 140 static void lowlevel_buffer_deallocate(struct drm_device *dev,
 141                 unsigned int flags, struct exynos_drm_gem_buf *buf)
 142 {
 143         DRM_DEBUG_KMS("%s.\n", __FILE__);
 144
 145         /*
 146          * release only physically continuous memory and
 147          * non-continuous memory would be released by exynos
 148          * gem framework.
 149          */
 150         if (IS_NONCONTIG_BUFFER(flags)) {
 151                 DRM_DEBUG_KMS("not support allocation type.\n");
 152                 return;
 153         }
 154
 155         if (!buf->dma_addr) {
 156                 DRM_DEBUG_KMS("dma_addr is invalid.\n");
 157                 return;
 158         }
 159
 160         DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
 161                         (unsigned long)buf->kvaddr,
 162                         (unsigned long)buf->dma_addr,
 163                         buf->size);
 164
 165         sg_free_table(buf->sgt);
 166
 167         kfree(buf->sgt);
 168         buf->sgt = NULL;
 169
 170         kfree(buf->pages);
 171         buf->pages = NULL;
 172
 173         dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
 174                                 (dma_addr_t)buf->dma_addr);
 175         buf->dma_addr = (dma_addr_t)NULL;
 176 }
 177
 178 struct exynos_drm_gem_buf *exynos_drm_init_buf(struct drm_device *dev,
 179                                                 unsigned int size)
 180 {
 181         struct exynos_drm_gem_buf *buffer;
 182
 183         DRM_DEBUG_KMS("%s.\n", __FILE__);
 184         DRM_DEBUG_KMS("desired size = 0x%x\n", size);
 185
 186         buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
 187         if (!buffer) {
 188                 DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
 189                 return NULL;
 190         }
 191
 192         buffer->size = size;
 193         return buffer;
 194 }
 195
 196 void exynos_drm_fini_buf(struct drm_device *dev,
 197                                 struct exynos_drm_gem_buf *buffer)
 198 {
 199         DRM_DEBUG_KMS("%s.\n", __FILE__);
 200
 201         if (!buffer) {
 202                 DRM_DEBUG_KMS("buffer is null.\n");
 203                 return;
 204         }
 205
 206         kfree(buffer);
 207         buffer = NULL;
 208 }
 209
 210 int exynos_drm_alloc_buf(struct drm_device *dev,
 211                 struct exynos_drm_gem_buf *buf, unsigned int flags)
 212 {
 213
 214         /*
 215          * allocate memory region and set the memory information
 216          * to vaddr and dma_addr of a buffer object.
 217          */
 218         if (lowlevel_buffer_allocate(dev, flags, buf) < 0)
 219                 return -ENOMEM;
 220
 221         return 0;
 222 }
 223
 224 void exynos_drm_free_buf(struct drm_device *dev,
 225                 unsigned int flags, struct exynos_drm_gem_buf *buffer)
 226 {
 227
 228         lowlevel_buffer_deallocate(dev, flags, buffer);
 229 }