drivers/gpu/drm/exynos_tmp/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 <linux/cma.h>
  31 #include "exynos_drm_drv.h"
  32 #include "exynos_drm_gem.h"
  33 #include "exynos_drm_buf.h"
  34
  35 static int lowlevel_buffer_allocate(struct drm_device *dev,
  36                 unsigned int flags, struct exynos_drm_gem_buf *buf)
  37 {
  38         dma_addr_t start_addr;
  39         unsigned int npages, i = 0;
  40         struct scatterlist *sgl;
  41         int ret = 0;
  42
  43         DRM_DEBUG_KMS("%s\n", __FILE__);
  44
  45         if (IS_NONCONTIG_BUFFER(flags)) {
  46                 DRM_DEBUG_KMS("not support allocation type.\n");
  47                 return -EINVAL;
  48         }
  49
  50         if (buf->dma_addr) {
  51                 DRM_DEBUG_KMS("already allocated.\n");
  52                 return 0;
  53         }
  54
  55         if (buf->size >= SZ_1M) {
  56                 npages = buf->size >> SECTION_SHIFT;
  57                 buf->page_size = SECTION_SIZE;
  58         } else if (buf->size >= SZ_64K) {
  59                 npages = buf->size >> 16;
  60                 buf->page_size = SZ_64K;
  61         } else {
  62                 npages = buf->size >> PAGE_SHIFT;
  63                 buf->page_size = PAGE_SIZE;
  64         }
  65
  66         buf->sgt = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
  67         if (!buf->sgt) {
  68                 DRM_ERROR("failed to allocate sg table.\n");
  69                 return -ENOMEM;
  70         }
  71
  72         ret = sg_alloc_table(buf->sgt, npages, GFP_KERNEL);
  73         if (ret < 0) {
  74                 DRM_ERROR("failed to initialize sg table.\n");
  75                 kfree(buf->sgt);
  76                 buf->sgt = NULL;
  77                 return -ENOMEM;
  78         }
  79
  80 #ifdef CONFIG_CMA
  81         buf->dma_addr = cma_alloc(dev->dev, "drm", buf->size,
  82                                         buf->page_size);
  83         if (IS_ERR((void *)buf->dma_addr)) {
  84                 DRM_DEBUG_KMS("cma_alloc of size %ld failed\n",
  85                                 buf->size);
  86                 ret = -ENOMEM;
  87                 goto err1;
  88         }
  89
  90         buf->kvaddr = phys_to_virt(buf->dma_addr);
  91 #else
  92         /* align it as page size(page or section) TODO */
  93
  94         buf->kvaddr = dma_alloc_writecombine(dev->dev, buf->size,
  95                         &buf->dma_addr, GFP_KERNEL);
  96         if (!buf->kvaddr) {
  97                 DRM_ERROR("failed to allocate buffer.\n");
  98                 ret = -ENOMEM;
  99                 goto err1;
 100         }
 101 #endif
 102         buf->pages = kzalloc(sizeof(struct page) * npages, GFP_KERNEL);
 103         if (!buf->pages) {
 104                 DRM_ERROR("failed to allocate pages.\n");
 105                 ret = -ENOMEM;
 106                 goto err2;
 107         }
 108
 109         sgl = buf->sgt->sgl;
 110         start_addr = buf->dma_addr;
 111
 112         while (i < npages) {
 113                 buf->pages[i] = phys_to_page(start_addr);
 114                 sg_set_page(sgl, buf->pages[i], buf->page_size, 0);
 115                 sg_dma_address(sgl) = start_addr;
 116                 start_addr += buf->page_size;
 117                 sgl = sg_next(sgl);
 118                 i++;
 119         }
 120
 121         DRM_INFO("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
 122                         (unsigned long)buf->kvaddr,
 123                         (unsigned long)buf->dma_addr,
 124                         buf->size);
 125
 126         return ret;
 127 err2:
 128 #ifdef CONFIG_CMA
 129         cma_free(buf->dma_addr);
 130 #else
 131         dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
 132                         (dma_addr_t)buf->dma_addr);
 133 #endif
 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          * now buffer is being shared and it would be released
 150          * by original owner so ignor free action.
 151          */
 152         if (buf->shared || atomic_read(&buf->shared_refcount))
 153                 return;
 154
 155         /*
 156          * release only physically continuous memory and
 157          * non-continuous memory would be released by exynos
 158          * gem framework.
 159          */
 160         if (IS_NONCONTIG_BUFFER(flags)) {
 161                 DRM_DEBUG_KMS("not support allocation type.\n");
 162                 return;
 163         }
 164
 165         if (!buf->dma_addr) {
 166                 DRM_DEBUG_KMS("dma_addr is invalid.\n");
 167                 return;
 168         }
 169
 170         sg_free_table(buf->sgt);
 171
 172         kfree(buf->sgt);
 173         buf->sgt = NULL;
 174
 175         kfree(buf->pages);
 176         buf->pages = NULL;
 177 #ifdef CONFIG_CMA
 178         cma_free(buf->dma_addr);
 179 #else
 180         dma_free_writecombine(dev->dev, buf->size, buf->kvaddr,
 181                                 (dma_addr_t)buf->dma_addr);
 182 #endif
 183         buf->dma_addr = (dma_addr_t)NULL;
 184 }
 185
 186 struct exynos_drm_gem_buf *exynos_drm_init_buf(struct drm_device *dev,
 187                                                 unsigned int size)
 188 {
 189         struct exynos_drm_gem_buf *buffer;
 190
 191         DRM_DEBUG_KMS("%s.\n", __FILE__);
 192         DRM_DEBUG_KMS("desired size = 0x%x\n", size);
 193
 194         buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
 195         if (!buffer) {
 196                 DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n");
 197                 return NULL;
 198         }
 199
 200         buffer->size = size;
 201         return buffer;
 202 }
 203
 204 void exynos_drm_fini_buf(struct drm_device *dev,
 205                                 struct exynos_drm_gem_buf *buffer)
 206 {
 207         DRM_DEBUG_KMS("%s.\n", __FILE__);
 208
 209         if (!buffer) {
 210                 DRM_DEBUG_KMS("buffer is null.\n");
 211                 return;
 212         }
 213
 214         kfree(buffer);
 215         buffer = NULL;
 216 }
 217
 218 int exynos_drm_alloc_buf(struct drm_device *dev,
 219                 struct exynos_drm_gem_buf *buf, unsigned int flags)
 220 {
 221
 222         /*
 223          * allocate memory region and set the memory information
 224          * to vaddr and dma_addr of a buffer object.
 225          */
 226         if (lowlevel_buffer_allocate(dev, flags, buf) < 0)
 227                 return -ENOMEM;
 228
 229         return 0;
 230 }
 231
 232 void exynos_drm_free_buf(struct drm_device *dev,
 233                 unsigned int flags, struct exynos_drm_gem_buf *buffer)
 234 {
 235
 236         lowlevel_buffer_deallocate(dev, flags, buffer);
 237 }
 238
 239 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
 240 MODULE_DESCRIPTION("Samsung SoC DRM Buffer Management Module");
 241 MODULE_LICENSE("GPL");