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 (flags & EXYNOS_BO_NONCONTIG) {
  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) + 1;
  56                 page_size = SECTION_SIZE;
  57         } else if (buf->size >= SZ_64K) {
  58                 npages = (buf->size >> 16) + 1;
  59                 page_size = SZ_64K;
  60         } else {
  61                 npages = (buf->size >> PAGE_SHIFT) + 1;
  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         sgl = sg_next(sgl);
 123         sg_set_page(sgl, buf->pages[i+1], end_addr - start_addr, 0);
 124
 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,
 128                         buf->size);
 129
 130         return ret;
 131 err2:
 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;
 135 err1:
 136         sg_free_table(buf->sgt);
 137         kfree(buf->sgt);
 138         buf->sgt = NULL;
 139
 140         return ret;
 141 }
 142
 143 static void lowlevel_buffer_deallocate(struct drm_device *dev,
 144                 unsigned int flags, struct exynos_drm_gem_buf *buf)
 145 {
 146         DRM_DEBUG_KMS("%s.\n", __FILE__);
 147
 148         /*
 149          * release only physically continuous memory and
 150          * non-continuous memory would be released by exynos
 151          * gem framework.
 152          */
 153         if (flags & EXYNOS_BO_NONCONTIG) {
 154                 DRM_DEBUG_KMS("not support allocation type.\n");
 155                 return;
 156         }
 157
 158         if (!buf->dma_addr) {
 159                 DRM_DEBUG_KMS("dma_addr is invalid.\n");
 160                 return;
 161         }
 162
 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,
 166                         buf->size);
 167
 168         sg_free_table(buf->sgt);
 169
 170         kfree(buf->sgt);
 171         buf->sgt = NULL;
 172
 173         kfree(buf->pages);
 174         buf->pages = NULL;
 175
 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;
 179 }
 180
 181 struct exynos_drm_gem_buf *exynos_drm_init_buf(struct drm_device *dev,
 182                                                 unsigned int size)
 183 {
 184         struct exynos_drm_gem_buf *buffer;
 185
 186         DRM_DEBUG_KMS("%s.\n", __FILE__);
 187         DRM_DEBUG_KMS("desired size = 0x%x\n", size);
 188
 189         buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
 190         if (!buffer) {
 191                 DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
 192                 return NULL;
 193         }
 194
 195         buffer->size = size;
 196         return buffer;
 197 }
 198
 199 void exynos_drm_fini_buf(struct drm_device *dev,
 200                                 struct exynos_drm_gem_buf *buffer)
 201 {
 202         DRM_DEBUG_KMS("%s.\n", __FILE__);
 203
 204         if (!buffer) {
 205                 DRM_DEBUG_KMS("buffer is null.\n");
 206                 return;
 207         }
 208
 209         kfree(buffer);
 210         buffer = NULL;
 211 }
 212
 213 int exynos_drm_alloc_buf(struct drm_device *dev,
 214                 struct exynos_drm_gem_buf *buf, unsigned int flags)
 215 {
 216
 217         /*
 218          * allocate memory region and set the memory information
 219          * to vaddr and dma_addr of a buffer object.
 220          */
 221         if (lowlevel_buffer_allocate(dev, flags, buf) < 0)
 222                 return -ENOMEM;
 223
 224         return 0;
 225 }
 226
 227 void exynos_drm_free_buf(struct drm_device *dev,
 228                 unsigned int flags, struct exynos_drm_gem_buf *buffer)
 229 {
 230
 231         lowlevel_buffer_deallocate(dev, flags, buffer);
 232 }