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_buf.h"
  31
  32 static DEFINE_MUTEX(exynos_drm_buf_lock);
  33
  34 static int lowlevel_buffer_allocate(struct drm_device *dev,
  35                 struct exynos_drm_buf_entry *entry)
  36 {
  37         DRM_DEBUG_KMS("%s\n", __FILE__);
  38
  39         entry->vaddr = dma_alloc_writecombine(dev->dev, entry->size,
  40                         (dma_addr_t *)&entry->paddr, GFP_KERNEL);
  41         if (!entry->paddr) {
  42                 DRM_ERROR("failed to allocate buffer.\n");
  43                 return -ENOMEM;
  44         }
  45
  46         DRM_DEBUG_KMS("allocated : vaddr(0x%x), paddr(0x%x), size(0x%x)\n",
  47                         (unsigned int)entry->vaddr, entry->paddr, entry->size);
  48
  49         return 0;
  50 }
  51
  52 static void lowlevel_buffer_deallocate(struct drm_device *dev,
  53                 struct exynos_drm_buf_entry *entry)
  54 {
  55         DRM_DEBUG_KMS("%s.\n", __FILE__);
  56
  57         if (entry->paddr && entry->vaddr && entry->size)
  58                 dma_free_writecombine(dev->dev, entry->size, entry->vaddr,
  59                                 entry->paddr);
  60         else
  61                 DRM_DEBUG_KMS("entry data is null.\n");
  62 }
  63
  64 struct exynos_drm_buf_entry *exynos_drm_buf_create(struct drm_device *dev,
  65                 unsigned int size)
  66 {
  67         struct exynos_drm_buf_entry *entry;
  68
  69         DRM_DEBUG_KMS("%s.\n", __FILE__);
  70
  71         entry = kzalloc(sizeof(*entry), GFP_KERNEL);
  72         if (!entry) {
  73                 DRM_ERROR("failed to allocate exynos_drm_buf_entry.\n");
  74                 return ERR_PTR(-ENOMEM);
  75         }
  76
  77         entry->size = size;
  78
  79         /*
  80          * allocate memory region with size and set the memory information
  81          * to vaddr and paddr of a entry object.
  82          */
  83         if (lowlevel_buffer_allocate(dev, entry) < 0) {
  84                 kfree(entry);
  85                 entry = NULL;
  86                 return ERR_PTR(-ENOMEM);
  87         }
  88
  89         return entry;
  90 }
  91
  92 void exynos_drm_buf_destroy(struct drm_device *dev,
  93                 struct exynos_drm_buf_entry *entry)
  94 {
  95         DRM_DEBUG_KMS("%s.\n", __FILE__);
  96
  97         if (!entry) {
  98                 DRM_DEBUG_KMS("entry is null.\n");
  99                 return;
 100         }
 101
 102         lowlevel_buffer_deallocate(dev, entry);
 103
 104         kfree(entry);
 105         entry = NULL;
 106 }
 107
 108 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 109 MODULE_DESCRIPTION("Samsung SoC DRM Buffer Management Module");
 110 MODULE_LICENSE("GPL");