Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 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" |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 28 | #include "exynos_drm.h" |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 29 | |
| 30 | #include "exynos_drm_drv.h" |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 31 | #include "exynos_drm_gem.h" |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 32 | #include "exynos_drm_buf.h" |
| 33 | |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 34 | static int lowlevel_buffer_allocate(struct drm_device *dev, |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 35 | unsigned int flags, struct exynos_drm_gem_buf *buf) |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 36 | { |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 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 | |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 42 | DRM_DEBUG_KMS("%s\n", __FILE__); |
| 43 | |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 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"); |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 68 | return -ENOMEM; |
| 69 | } |
| 70 | |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 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 | } |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 78 | |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 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; |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | static void lowlevel_buffer_deallocate(struct drm_device *dev, |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 144 | unsigned int flags, struct exynos_drm_gem_buf *buf) |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 145 | { |
| 146 | DRM_DEBUG_KMS("%s.\n", __FILE__); |
| 147 | |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 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; |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 179 | } |
| 180 | |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 181 | struct exynos_drm_gem_buf *exynos_drm_init_buf(struct drm_device *dev, |
| 182 | unsigned int size) |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 183 | { |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 184 | struct exynos_drm_gem_buf *buffer; |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 185 | |
| 186 | DRM_DEBUG_KMS("%s.\n", __FILE__); |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 187 | DRM_DEBUG_KMS("desired size = 0x%x\n", size); |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 188 | |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 189 | buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); |
| 190 | if (!buffer) { |
| 191 | DRM_ERROR("failed to allocate exynos_drm_gem_buf.\n"); |
Joonyoung Shim | ee5e770 | 2011-12-13 14:20:23 +0900 | [diff] [blame] | 192 | return NULL; |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 193 | } |
| 194 | |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 195 | buffer->size = size; |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 196 | return buffer; |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 197 | } |
| 198 | |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 199 | void exynos_drm_fini_buf(struct drm_device *dev, |
| 200 | struct exynos_drm_gem_buf *buffer) |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 201 | { |
| 202 | DRM_DEBUG_KMS("%s.\n", __FILE__); |
| 203 | |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 204 | if (!buffer) { |
| 205 | DRM_DEBUG_KMS("buffer is null.\n"); |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 206 | return; |
| 207 | } |
| 208 | |
Inki Dae | 2c87112 | 2011-11-12 15:23:32 +0900 | [diff] [blame] | 209 | kfree(buffer); |
| 210 | buffer = NULL; |
Inki Dae | 1c248b7 | 2011-10-04 19:19:01 +0900 | [diff] [blame] | 211 | } |
| 212 | |
Inki Dae | 2b35892 | 2012-03-16 18:47:05 +0900 | [diff] [blame] | 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 | } |