1 /* 2 * Copyright (c) 2015 MediaTek Inc. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <drm/drmP.h> 15 #include <drm/drm_gem.h> 16 #include <linux/dma-buf.h> 17 18 #include "mtk_drm_drv.h" 19 #include "mtk_drm_gem.h" 20 21 static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev, 22 unsigned long size) 23 { 24 struct mtk_drm_gem_obj *mtk_gem_obj; 25 int ret; 26 27 size = round_up(size, PAGE_SIZE); 28 29 mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL); 30 if (!mtk_gem_obj) 31 return ERR_PTR(-ENOMEM); 32 33 ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size); 34 if (ret < 0) { 35 DRM_ERROR("failed to initialize gem object\n"); 36 kfree(mtk_gem_obj); 37 return ERR_PTR(ret); 38 } 39 40 return mtk_gem_obj; 41 } 42 43 struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev, 44 size_t size, bool alloc_kmap) 45 { 46 struct mtk_drm_private *priv = dev->dev_private; 47 struct mtk_drm_gem_obj *mtk_gem; 48 struct drm_gem_object *obj; 49 int ret; 50 51 mtk_gem = mtk_drm_gem_init(dev, size); 52 if (IS_ERR(mtk_gem)) 53 return ERR_CAST(mtk_gem); 54 55 obj = &mtk_gem->base; 56 57 mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE; 58 59 if (!alloc_kmap) 60 mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING; 61 62 mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size, 63 &mtk_gem->dma_addr, GFP_KERNEL, 64 mtk_gem->dma_attrs); 65 if (!mtk_gem->cookie) { 66 DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size); 67 ret = -ENOMEM; 68 goto err_gem_free; 69 } 70 71 if (alloc_kmap) 72 mtk_gem->kvaddr = mtk_gem->cookie; 73 74 DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n", 75 mtk_gem->cookie, &mtk_gem->dma_addr, 76 size); 77 78 return mtk_gem; 79 80 err_gem_free: 81 drm_gem_object_release(obj); 82 kfree(mtk_gem); 83 return ERR_PTR(ret); 84 } 85 86 void mtk_drm_gem_free_object(struct drm_gem_object *obj) 87 { 88 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); 89 struct mtk_drm_private *priv = obj->dev->dev_private; 90 91 if (mtk_gem->sg) 92 drm_prime_gem_destroy(obj, mtk_gem->sg); 93 else 94 dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie, 95 mtk_gem->dma_addr, mtk_gem->dma_attrs); 96 97 /* release file pointer to gem object. */ 98 drm_gem_object_release(obj); 99 100 kfree(mtk_gem); 101 } 102 103 int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev, 104 struct drm_mode_create_dumb *args) 105 { 106 struct mtk_drm_gem_obj *mtk_gem; 107 int ret; 108 109 args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 110 args->size = args->pitch * args->height; 111 112 mtk_gem = mtk_drm_gem_create(dev, args->size, false); 113 if (IS_ERR(mtk_gem)) 114 return PTR_ERR(mtk_gem); 115 116 /* 117 * allocate a id of idr table where the obj is registered 118 * and handle has the id what user can see. 119 */ 120 ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle); 121 if (ret) 122 goto err_handle_create; 123 124 /* drop reference from allocate - handle holds it now. */ 125 drm_gem_object_put_unlocked(&mtk_gem->base); 126 127 return 0; 128 129 err_handle_create: 130 mtk_drm_gem_free_object(&mtk_gem->base); 131 return ret; 132 } 133 134 static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj, 135 struct vm_area_struct *vma) 136 137 { 138 int ret; 139 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); 140 struct mtk_drm_private *priv = obj->dev->dev_private; 141 142 /* 143 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear 144 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap(). 145 */ 146 vma->vm_flags &= ~VM_PFNMAP; 147 vma->vm_pgoff = 0; 148 149 ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie, 150 mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs); 151 if (ret) 152 drm_gem_vm_close(vma); 153 154 return ret; 155 } 156 157 int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma) 158 { 159 int ret; 160 161 ret = drm_gem_mmap_obj(obj, obj->size, vma); 162 if (ret) 163 return ret; 164 165 return mtk_drm_gem_object_mmap(obj, vma); 166 } 167 168 int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) 169 { 170 struct drm_gem_object *obj; 171 int ret; 172 173 ret = drm_gem_mmap(filp, vma); 174 if (ret) 175 return ret; 176 177 obj = vma->vm_private_data; 178 179 return mtk_drm_gem_object_mmap(obj, vma); 180 } 181 182 /* 183 * Allocate a sg_table for this GEM object. 184 * Note: Both the table's contents, and the sg_table itself must be freed by 185 * the caller. 186 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error. 187 */ 188 struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj) 189 { 190 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); 191 struct mtk_drm_private *priv = obj->dev->dev_private; 192 struct sg_table *sgt; 193 int ret; 194 195 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); 196 if (!sgt) 197 return ERR_PTR(-ENOMEM); 198 199 ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie, 200 mtk_gem->dma_addr, obj->size, 201 mtk_gem->dma_attrs); 202 if (ret) { 203 DRM_ERROR("failed to allocate sgt, %d\n", ret); 204 kfree(sgt); 205 return ERR_PTR(ret); 206 } 207 208 return sgt; 209 } 210 211 struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev, 212 struct dma_buf_attachment *attach, struct sg_table *sg) 213 { 214 struct mtk_drm_gem_obj *mtk_gem; 215 int ret; 216 struct scatterlist *s; 217 unsigned int i; 218 dma_addr_t expected; 219 220 mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size); 221 222 if (IS_ERR(mtk_gem)) 223 return ERR_CAST(mtk_gem); 224 225 expected = sg_dma_address(sg->sgl); 226 for_each_sg(sg->sgl, s, sg->nents, i) { 227 if (sg_dma_address(s) != expected) { 228 DRM_ERROR("sg_table is not contiguous"); 229 ret = -EINVAL; 230 goto err_gem_free; 231 } 232 expected = sg_dma_address(s) + sg_dma_len(s); 233 } 234 235 mtk_gem->dma_addr = sg_dma_address(sg->sgl); 236 mtk_gem->sg = sg; 237 238 return &mtk_gem->base; 239 240 err_gem_free: 241 kfree(mtk_gem); 242 return ERR_PTR(ret); 243 } 244 245 void *mtk_drm_gem_prime_vmap(struct drm_gem_object *obj) 246 { 247 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); 248 struct sg_table *sgt; 249 struct sg_page_iter iter; 250 unsigned int npages; 251 unsigned int i = 0; 252 253 if (mtk_gem->kvaddr) 254 return mtk_gem->kvaddr; 255 256 sgt = mtk_gem_prime_get_sg_table(obj); 257 if (IS_ERR(sgt)) 258 return NULL; 259 260 npages = obj->size >> PAGE_SHIFT; 261 mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL); 262 if (!mtk_gem->pages) 263 goto out; 264 265 for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) { 266 mtk_gem->pages[i++] = sg_page_iter_page(&iter); 267 if (i > npages) 268 break; 269 } 270 mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP, 271 pgprot_writecombine(PAGE_KERNEL)); 272 273 out: 274 kfree((void *)sgt); 275 276 return mtk_gem->kvaddr; 277 } 278 279 void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr) 280 { 281 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); 282 283 if (!mtk_gem->pages) 284 return; 285 286 vunmap(vaddr); 287 mtk_gem->kvaddr = 0; 288 kfree((void *)mtk_gem->pages); 289 } 290