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 static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj, 58 struct vm_area_struct *vma) 59 60 { 61 int ret; 62 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 63 struct drm_device *drm = obj->dev; 64 65 /* 66 * dma_alloc_attrs() allocated a struct page table for rk_obj, so clear 67 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap(). 68 */ 69 vma->vm_flags &= ~VM_PFNMAP; 70 71 ret = dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr, 72 obj->size, &rk_obj->dma_attrs); 73 if (ret) 74 drm_gem_vm_close(vma); 75 76 return ret; 77 } 78 79 int rockchip_gem_mmap_buf(struct drm_gem_object *obj, 80 struct vm_area_struct *vma) 81 { 82 int ret; 83 84 ret = drm_gem_mmap_obj(obj, obj->size, vma); 85 if (ret) 86 return ret; 87 88 return rockchip_drm_gem_object_mmap(obj, vma); 89 } 90 91 /* drm driver mmap file operations */ 92 int rockchip_gem_mmap(struct file *filp, struct vm_area_struct *vma) 93 { 94 struct drm_gem_object *obj; 95 int ret; 96 97 ret = drm_gem_mmap(filp, vma); 98 if (ret) 99 return ret; 100 101 obj = vma->vm_private_data; 102 103 return rockchip_drm_gem_object_mmap(obj, vma); 104 } 105 106 struct rockchip_gem_object * 107 rockchip_gem_create_object(struct drm_device *drm, unsigned int size, 108 bool alloc_kmap) 109 { 110 struct rockchip_gem_object *rk_obj; 111 struct drm_gem_object *obj; 112 int ret; 113 114 size = round_up(size, PAGE_SIZE); 115 116 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL); 117 if (!rk_obj) 118 return ERR_PTR(-ENOMEM); 119 120 obj = &rk_obj->base; 121 122 drm_gem_private_object_init(drm, obj, size); 123 124 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap); 125 if (ret) 126 goto err_free_rk_obj; 127 128 return rk_obj; 129 130 err_free_rk_obj: 131 kfree(rk_obj); 132 return ERR_PTR(ret); 133 } 134 135 /* 136 * rockchip_gem_free_object - (struct drm_driver)->gem_free_object callback 137 * function 138 */ 139 void rockchip_gem_free_object(struct drm_gem_object *obj) 140 { 141 struct rockchip_gem_object *rk_obj; 142 143 drm_gem_free_mmap_offset(obj); 144 145 rk_obj = to_rockchip_obj(obj); 146 147 rockchip_gem_free_buf(rk_obj); 148 149 kfree(rk_obj); 150 } 151 152 /* 153 * rockchip_gem_create_with_handle - allocate an object with the given 154 * size and create a gem handle on it 155 * 156 * returns a struct rockchip_gem_object* on success or ERR_PTR values 157 * on failure. 158 */ 159 static struct rockchip_gem_object * 160 rockchip_gem_create_with_handle(struct drm_file *file_priv, 161 struct drm_device *drm, unsigned int size, 162 unsigned int *handle) 163 { 164 struct rockchip_gem_object *rk_obj; 165 struct drm_gem_object *obj; 166 int ret; 167 168 rk_obj = rockchip_gem_create_object(drm, size, false); 169 if (IS_ERR(rk_obj)) 170 return ERR_CAST(rk_obj); 171 172 obj = &rk_obj->base; 173 174 /* 175 * allocate a id of idr table where the obj is registered 176 * and handle has the id what user can see. 177 */ 178 ret = drm_gem_handle_create(file_priv, obj, handle); 179 if (ret) 180 goto err_handle_create; 181 182 /* drop reference from allocate - handle holds it now. */ 183 drm_gem_object_unreference_unlocked(obj); 184 185 return rk_obj; 186 187 err_handle_create: 188 rockchip_gem_free_object(obj); 189 190 return ERR_PTR(ret); 191 } 192 193 int rockchip_gem_dumb_map_offset(struct drm_file *file_priv, 194 struct drm_device *dev, uint32_t handle, 195 uint64_t *offset) 196 { 197 struct drm_gem_object *obj; 198 int ret; 199 200 obj = drm_gem_object_lookup(dev, file_priv, handle); 201 if (!obj) { 202 DRM_ERROR("failed to lookup gem object.\n"); 203 return -EINVAL; 204 } 205 206 ret = drm_gem_create_mmap_offset(obj); 207 if (ret) 208 goto out; 209 210 *offset = drm_vma_node_offset_addr(&obj->vma_node); 211 DRM_DEBUG_KMS("offset = 0x%llx\n", *offset); 212 213 out: 214 drm_gem_object_unreference_unlocked(obj); 215 216 return 0; 217 } 218 219 /* 220 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback 221 * function 222 * 223 * This aligns the pitch and size arguments to the minimum required. wrap 224 * this into your own function if you need bigger alignment. 225 */ 226 int rockchip_gem_dumb_create(struct drm_file *file_priv, 227 struct drm_device *dev, 228 struct drm_mode_create_dumb *args) 229 { 230 struct rockchip_gem_object *rk_obj; 231 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 232 233 /* 234 * align to 64 bytes since Mali requires it. 235 */ 236 min_pitch = ALIGN(min_pitch, 64); 237 238 if (args->pitch < min_pitch) 239 args->pitch = min_pitch; 240 241 if (args->size < args->pitch * args->height) 242 args->size = args->pitch * args->height; 243 244 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size, 245 &args->handle); 246 247 return PTR_ERR_OR_ZERO(rk_obj); 248 } 249 250 /* 251 * Allocate a sg_table for this GEM object. 252 * Note: Both the table's contents, and the sg_table itself must be freed by 253 * the caller. 254 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error. 255 */ 256 struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj) 257 { 258 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 259 struct drm_device *drm = obj->dev; 260 struct sg_table *sgt; 261 int ret; 262 263 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); 264 if (!sgt) 265 return ERR_PTR(-ENOMEM); 266 267 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr, 268 rk_obj->dma_addr, obj->size, 269 &rk_obj->dma_attrs); 270 if (ret) { 271 DRM_ERROR("failed to allocate sgt, %d\n", ret); 272 kfree(sgt); 273 return ERR_PTR(ret); 274 } 275 276 return sgt; 277 } 278 279 void *rockchip_gem_prime_vmap(struct drm_gem_object *obj) 280 { 281 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj); 282 283 if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, &rk_obj->dma_attrs)) 284 return NULL; 285 286 return rk_obj->kvaddr; 287 } 288 289 void rockchip_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr) 290 { 291 /* Nothing to do */ 292 } 293