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
  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                 struct exynos_drm_gem_buf *buffer)
  35 {
  36         DRM_DEBUG_KMS("%s\n", __FILE__);
  37
  38         buffer->kvaddr = dma_alloc_writecombine(dev->dev, buffer->size,
  39                         &buffer->dma_addr, GFP_KERNEL);
  40         if (!buffer->kvaddr) {
  41                 DRM_ERROR("failed to allocate buffer.\n");
  42                 return -ENOMEM;
  43         }
  44
  45         DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
  46                         (unsigned long)buffer->kvaddr,
  47                         (unsigned long)buffer->dma_addr,
  48                         buffer->size);
  49
  50         return 0;
  51 }
  52
  53 static void lowlevel_buffer_deallocate(struct drm_device *dev,
  54                 struct exynos_drm_gem_buf *buffer)
  55 {
  56         DRM_DEBUG_KMS("%s.\n", __FILE__);
  57
  58         if (buffer->dma_addr && buffer->size)
  59                 dma_free_writecombine(dev->dev, buffer->size, buffer->kvaddr,
  60                                 (dma_addr_t)buffer->dma_addr);
  61         else
  62                 DRM_DEBUG_KMS("buffer data are invalid.\n");
  63 }
  64
  65 struct exynos_drm_gem_buf *exynos_drm_buf_create(struct drm_device *dev,
  66                 unsigned int size)
  67 {
  68         struct exynos_drm_gem_buf *buffer;
  69
  70         DRM_DEBUG_KMS("%s.\n", __FILE__);
  71         DRM_DEBUG_KMS("desired size = 0x%x\n", size);
  72
  73         buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
  74         if (!buffer) {
  75                 DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
  76                 return NULL;
  77         }
  78
  79         buffer->size = size;
  80
  81         /*
  82          * allocate memory region with size and set the memory information
  83          * to vaddr and dma_addr of a buffer object.
  84          */
  85         if (lowlevel_buffer_allocate(dev, buffer) < 0) {
  86                 kfree(buffer);
  87                 return NULL;
  88         }
  89
  90         return buffer;
  91 }
  92
  93 void exynos_drm_buf_destroy(struct drm_device *dev,
  94                 struct exynos_drm_gem_buf *buffer)
  95 {
  96         DRM_DEBUG_KMS("%s.\n", __FILE__);
  97
  98         if (!buffer) {
  99                 DRM_DEBUG_KMS("buffer is null.\n");
 100                 return;
 101         }
 102
 103         lowlevel_buffer_deallocate(dev, buffer);
 104
 105         kfree(buffer);
 106         buffer = NULL;
 107 }
 108
 109 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 110 MODULE_DESCRIPTION("Samsung SoC DRM Buffer Management Module");
 111 MODULE_LICENSE("GPL");