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