1 /* 2 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd 3 * Author:Mark Yao <mark.yao@rock-chips.com> 4 * 5 * This software is licensed under the terms of the GNU General Public 6 * License version 2, as published by the Free Software Foundation, and 7 * may be copied, distributed, and modified under those terms. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 15 #include <drm/drm.h> 16 #include <drm/drmP.h> 17 #include <drm/drm_gem.h> 18 #include <drm/drm_vma_manager.h> 19 20 #include <linux/dma-attrs.h> 21 22 #include "rockchip_drm_drv.h" 23 #include "rockchip_drm_gem.h" 24 25 static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj, 26 bool alloc_kmap) 27 { 28 struct drm_gem_object *obj = &rk_obj->base; 29 struct drm_device *drm = obj->dev; 30 31 init_dma_attrs(&rk_obj->dma_attrs); 32 dma_set_attr(DMA_ATTR_WRITE_COMBINE, &rk_obj->dma_attrs); 33 34 if (!alloc_kmap) 35 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs); 36 37 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size, 38 &rk_obj->dma_addr, GFP_KERNEL, 39 &rk_obj->dma_attrs); 40 if (!rk_obj->kvaddr) { 41 DRM_ERROR("failed to allocate %#x byte dma buffer", obj->size); 42 return -ENOMEM; 43 } 44 45 return 0; 46 } 47 48 static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj) 49 { 50 struct drm_gem_object *obj = &rk_obj->base; 51 struct drm_device *drm = obj->dev; 52 53 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr, 54 &rk_obj->dma_attrs); 55 } 56 57 int rockchip_gem_mmap_buf(struct drm_gem_object *obj, 58 struct vm_area_struct *vma) 59 { 60 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 61 struct drm_device *drm = obj->dev; 62 unsigned long vm_size; 63 64 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 65 vm_size = vma->vm_end - vma->vm_start; 66 67 if (vm_size > obj->size) 68 return -EINVAL; 69 70 return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr, 71 obj->size, &rk_obj->dma_attrs); 72 } 73 74 /* drm driver mmap file operations */ 75 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma) 76 { 77 struct drm_file *priv = filp->private_data; 78 struct drm_device *dev = priv->minor->dev; 79 struct drm_gem_object *obj; 80 struct drm_vma_offset_node *node; 81 int ret; 82 83 if (drm_device_is_unplugged(dev)) 84 return -ENODEV; 85 86 mutex_lock(&dev->struct_mutex); 87 88 node = drm_vma_offset_exact_lookup(dev->vma_offset_manager, 89 vma->vm_pgoff, 90 vma_pages(vma)); 91 if (!node) { 92 mutex_unlock(&dev->struct_mutex); 93 DRM_ERROR("failed to find vma node.\n"); 94 return -EINVAL; 95 } else if (!drm_vma_node_is_allowed(node, filp)) { 96 mutex_unlock(&dev->struct_mutex); 97 return -EACCES; 98 } 99 100 obj = container_of(node, struct drm_gem_object, vma_node); 101 ret = rockchip_gem_mmap_buf(obj, vma); 102 103 mutex_unlock(&dev->struct_mutex); 104 105 return ret; 106 } 107 108 struct rockchip_gem_object * 109 rockchip_gem_create_object(struct drm_device *drm, unsigned int size, 110 bool alloc_kmap) 111 { 112 struct rockchip_gem_object *rk_obj; 113 struct drm_gem_object *obj; 114 int ret; 115 116 size = round_up(size, PAGE_SIZE); 117 118 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL); 119 if (!rk_obj) 120 return ERR_PTR(-ENOMEM); 121 122 obj = &rk_obj->base; 123 124 drm_gem_private_object_init(drm, obj, size); 125 126 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap); 127 if (ret) 128 goto err_free_rk_obj; 129 130 return rk_obj; 131 132 err_free_rk_obj: 133 kfree(rk_obj); 134 return ERR_PTR(ret); 135 } 136 137 /* 138 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback 139 * function 140 */ 141 void rockchip_gem_free_object(struct drm_gem_object *obj) 142 { 143 struct rockchip_gem_object *rk_obj; 144 145 drm_gem_free_mmap_offset(obj); 146 147 rk_obj = to_rockchip_obj(obj); 148 149 rockchip_gem_free_buf(rk_obj); 150 151 kfree(rk_obj); 152 } 153 154 /* 155 * rockchip_gem_create_with_handle - allocate an object with the given 156 * size and create a gem handle on it 157 * 158 * returns a struct rockchip_gem_object* on success or ERR_PTR values 159 * on failure. 160 */ 161 static struct rockchip_gem_object * 162 rockchip_gem_create_with_handle(struct drm_file *file_priv, 163 struct drm_device *drm, unsigned int size, 164 unsigned int *handle) 165 { 166 struct rockchip_gem_object *rk_obj; 167 struct drm_gem_object *obj; 168 int ret; 169 170 rk_obj = rockchip_gem_create_object(drm, size, false); 171 if (IS_ERR(rk_obj)) 172 return ERR_CAST(rk_obj); 173 174 obj = &rk_obj->base; 175 176 /* 177 * allocate a id of idr table where the obj is registered 178 * and handle has the id what user can see. 179 */ 180 ret = drm_gem_handle_create(file_priv, obj, handle); 181 if (ret) 182 goto err_handle_create; 183 184 /* drop reference from allocate - handle holds it now. */ 185 drm_gem_object_unreference_unlocked(obj); 186 187 return rk_obj; 188 189 err_handle_create: 190 rockchip_gem_free_object(obj); 191 192 return ERR_PTR(ret); 193 } 194 195 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv, 196 struct drm_device *dev, uint32_t handle, 197 uint64_t *offset) 198 { 199 struct drm_gem_object *obj; 200 int ret; 201 202 mutex_lock(&dev->struct_mutex); 203 204 obj = drm_gem_object_lookup(dev, file_priv, handle); 205 if (!obj) { 206 DRM_ERROR("failed to lookup gem object.\n"); 207 ret = -EINVAL; 208 goto unlock; 209 } 210 211 ret = drm_gem_create_mmap_offset(obj); 212 if (ret) 213 goto out; 214 215 *offset = drm_vma_node_offset_addr(&obj->vma_node); 216 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset); 217 218 out: 219 drm_gem_object_unreference(obj); 220 unlock: 221 mutex_unlock(&dev->struct_mutex); 222 return ret; 223 } 224 225 /* 226 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback 227 * function 228 * 229 * This aligns the pitch and size arguments to the minimum required. wrap 230 * this into your own function if you need bigger alignment. 231 */ 232 int rockchip_gem_dumb_create(struct drm_file *file_priv, 233 struct drm_device *dev, 234 struct drm_mode_create_dumb *args) 235 { 236 struct rockchip_gem_object *rk_obj; 237 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 238 239 /* 240 * align to 64 bytes since Mali requires it. 241 */ 242 min_pitch = ALIGN(min_pitch, 64); 243 244 if (args->pitch < min_pitch) 245 args->pitch = min_pitch; 246 247 if (args->size < args->pitch * args->height) 248 args->size = args->pitch * args->height; 249 250 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size, 251 &args->handle); 252 253 return PTR_ERR_OR_ZERO(rk_obj); 254 } 255 256 /* 257 * Allocate a sg_table for this GEM object. 258 * Note: Both the table's contents, and the sg_table itself must be freed by 259 * the caller. 260 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error. 261 */ 262 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj) 263 { 264 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 265 struct drm_device *drm = obj->dev; 266 struct sg_table *sgt; 267 int ret; 268 269 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); 270 if (!sgt) 271 return ERR_PTR(-ENOMEM); 272 273 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr, 274 rk_obj->dma_addr, obj->size, 275 &rk_obj->dma_attrs); 276 if (ret) { 277 DRM_ERROR("failed to allocate sgt, %d\n", ret); 278 kfree(sgt); 279 return ERR_PTR(ret); 280 } 281 282 return sgt; 283 } 284 285 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj) 286 { 287 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 288 289 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs)) 290 return NULL; 291 292 return rk_obj->kvaddr; 293 } 294 295 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr) 296 { 297 /* Nothing to do */ 298 } 299