1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2015 MediaTek Inc. 4 */ 5 6 #include <drm/drmP.h> 7 #include <drm/drm_gem.h> 8 #include <linux/dma-buf.h> 9 10 #include "mtk_drm_drv.h" 11 #include "mtk_drm_gem.h" 12 13 static struct mtk_drm_gem_obj *mtk_drm_gem_init(struct drm_device *dev, 14 unsigned long size) 15 { 16 struct mtk_drm_gem_obj *mtk_gem_obj; 17 int ret; 18 19 size = round_up(size, PAGE_SIZE); 20 21 mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL); 22 if (!mtk_gem_obj) 23 return ERR_PTR(-ENOMEM); 24 25 ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size); 26 if (ret < 0) { 27 DRM_ERROR("failed to initialize gem object\n"); 28 kfree(mtk_gem_obj); 29 return ERR_PTR(ret); 30 } 31 32 return mtk_gem_obj; 33 } 34 35 struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev, 36 size_t size, bool alloc_kmap) 37 { 38 struct mtk_drm_private *priv = dev->dev_private; 39 struct mtk_drm_gem_obj *mtk_gem; 40 struct drm_gem_object *obj; 41 int ret; 42 43 mtk_gem = mtk_drm_gem_init(dev, size); 44 if (IS_ERR(mtk_gem)) 45 return ERR_CAST(mtk_gem); 46 47 obj = &mtk_gem->base; 48 49 mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE; 50 51 if (!alloc_kmap) 52 mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING; 53 54 mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size, 55 &mtk_gem->dma_addr, GFP_KERNEL, 56 mtk_gem->dma_attrs); 57 if (!mtk_gem->cookie) { 58 DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size); 59 ret = -ENOMEM; 60 goto err_gem_free; 61 } 62 63 if (alloc_kmap) 64 mtk_gem->kvaddr = mtk_gem->cookie; 65 66 DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n", 67 mtk_gem->cookie, &mtk_gem->dma_addr, 68 size); 69 70 return mtk_gem; 71 72 err_gem_free: 73 drm_gem_object_release(obj); 74 kfree(mtk_gem); 75 return ERR_PTR(ret); 76 } 77 78 void mtk_drm_gem_free_object(struct drm_gem_object *obj) 79 { 80 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); 81 struct mtk_drm_private *priv = obj->dev->dev_private; 82 83 if (mtk_gem->sg) 84 drm_prime_gem_destroy(obj, mtk_gem->sg); 85 else 86 dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie, 87 mtk_gem->dma_addr, mtk_gem->dma_attrs); 88 89 /* release file pointer to gem object. */ 90 drm_gem_object_release(obj); 91 92 kfree(mtk_gem); 93 } 94 95 int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev, 96 struct drm_mode_create_dumb *args) 97 { 98 struct mtk_drm_gem_obj *mtk_gem; 99 int ret; 100 101 args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 102 args->size = args->pitch * args->height; 103 104 mtk_gem = mtk_drm_gem_create(dev, args->size, false); 105 if (IS_ERR(mtk_gem)) 106 return PTR_ERR(mtk_gem); 107 108 /* 109 * allocate a id of idr table where the obj is registered 110 * and handle has the id what user can see. 111 */ 112 ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle); 113 if (ret) 114 goto err_handle_create; 115 116 /* drop reference from allocate - handle holds it now. */ 117 drm_gem_object_put_unlocked(&mtk_gem->base); 118 119 return 0; 120 121 err_handle_create: 122 mtk_drm_gem_free_object(&mtk_gem->base); 123 return ret; 124 } 125 126 static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj, 127 struct vm_area_struct *vma) 128 129 { 130 int ret; 131 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); 132 struct mtk_drm_private *priv = obj->dev->dev_private; 133 134 /* 135 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear 136 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap(). 137 */ 138 vma->vm_flags &= ~VM_PFNMAP; 139 140 ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie, 141 mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs); 142 if (ret) 143 drm_gem_vm_close(vma); 144 145 return ret; 146 } 147 148 int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma) 149 { 150 int ret; 151 152 ret = drm_gem_mmap_obj(obj, obj->size, vma); 153 if (ret) 154 return ret; 155 156 return mtk_drm_gem_object_mmap(obj, vma); 157 } 158 159 int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) 160 { 161 struct drm_gem_object *obj; 162 int ret; 163 164 ret = drm_gem_mmap(filp, vma); 165 if (ret) 166 return ret; 167 168 obj = vma->vm_private_data; 169 170 /* 171 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the 172 * whole buffer from the start. 173 */ 174 vma->vm_pgoff = 0; 175 176 return mtk_drm_gem_object_mmap(obj, vma); 177 } 178 179 /* 180 * Allocate a sg_table for this GEM object. 181 * Note: Both the table's contents, and the sg_table itself must be freed by 182 * the caller. 183 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error. 184 */ 185 struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj) 186 { 187 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); 188 struct mtk_drm_private *priv = obj->dev->dev_private; 189 struct sg_table *sgt; 190 int ret; 191 192 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); 193 if (!sgt) 194 return ERR_PTR(-ENOMEM); 195 196 ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie, 197 mtk_gem->dma_addr, obj->size, 198 mtk_gem->dma_attrs); 199 if (ret) { 200 DRM_ERROR("failed to allocate sgt, %d\n", ret); 201 kfree(sgt); 202 return ERR_PTR(ret); 203 } 204 205 return sgt; 206 } 207 208 struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev, 209 struct dma_buf_attachment *attach, struct sg_table *sg) 210 { 211 struct mtk_drm_gem_obj *mtk_gem; 212 int ret; 213 struct scatterlist *s; 214 unsigned int i; 215 dma_addr_t expected; 216 217 mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size); 218 219 if (IS_ERR(mtk_gem)) 220 return ERR_CAST(mtk_gem); 221 222 expected = sg_dma_address(sg->sgl); 223 for_each_sg(sg->sgl, s, sg->nents, i) { 224 if (sg_dma_address(s) != expected) { 225 DRM_ERROR("sg_table is not contiguous"); 226 ret = -EINVAL; 227 goto err_gem_free; 228 } 229 expected = sg_dma_address(s) + sg_dma_len(s); 230 } 231 232 mtk_gem->dma_addr = sg_dma_address(sg->sgl); 233 mtk_gem->sg = sg; 234 235 return &mtk_gem->base; 236 237 err_gem_free: 238 kfree(mtk_gem); 239 return ERR_PTR(ret); 240 } 241 242 void *mtk_drm_gem_prime_vmap(struct drm_gem_object *obj) 243 { 244 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); 245 struct sg_table *sgt; 246 struct sg_page_iter iter; 247 unsigned int npages; 248 unsigned int i = 0; 249 250 if (mtk_gem->kvaddr) 251 return mtk_gem->kvaddr; 252 253 sgt = mtk_gem_prime_get_sg_table(obj); 254 if (IS_ERR(sgt)) 255 return NULL; 256 257 npages = obj->size >> PAGE_SHIFT; 258 mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL); 259 if (!mtk_gem->pages) 260 goto out; 261 262 for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) { 263 mtk_gem->pages[i++] = sg_page_iter_page(&iter); 264 if (i > npages) 265 break; 266 } 267 mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP, 268 pgprot_writecombine(PAGE_KERNEL)); 269 270 out: 271 kfree((void *)sgt); 272 273 return mtk_gem->kvaddr; 274 } 275 276 void mtk_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr) 277 { 278 struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj); 279 280 if (!mtk_gem->pages) 281 return; 282 283 vunmap(vaddr); 284 mtk_gem->kvaddr = 0; 285 kfree((void *)mtk_gem->pages); 286 } 287