1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2020 Intel Corporation 4 */ 5 6 #include "gem/i915_gem_ioctls.h" 7 #include "gem/i915_gem_lmem.h" 8 #include "gem/i915_gem_region.h" 9 10 #include "i915_drv.h" 11 #include "i915_trace.h" 12 #include "i915_user_extensions.h" 13 14 static u32 object_max_page_size(struct drm_i915_gem_object *obj) 15 { 16 u32 max_page_size = 0; 17 int i; 18 19 for (i = 0; i < obj->mm.n_placements; i++) { 20 struct intel_memory_region *mr = obj->mm.placements[i]; 21 22 GEM_BUG_ON(!is_power_of_2(mr->min_page_size)); 23 max_page_size = max_t(u32, max_page_size, mr->min_page_size); 24 } 25 26 GEM_BUG_ON(!max_page_size); 27 return max_page_size; 28 } 29 30 static void object_set_placements(struct drm_i915_gem_object *obj, 31 struct intel_memory_region **placements, 32 unsigned int n_placements) 33 { 34 GEM_BUG_ON(!n_placements); 35 36 /* 37 * For the common case of one memory region, skip storing an 38 * allocated array and just point at the region directly. 39 */ 40 if (n_placements == 1) { 41 struct intel_memory_region *mr = placements[0]; 42 struct drm_i915_private *i915 = mr->i915; 43 44 obj->mm.placements = &i915->mm.regions[mr->id]; 45 obj->mm.n_placements = 1; 46 } else { 47 obj->mm.placements = placements; 48 obj->mm.n_placements = n_placements; 49 } 50 } 51 52 static int i915_gem_publish(struct drm_i915_gem_object *obj, 53 struct drm_file *file, 54 u64 *size_p, 55 u32 *handle_p) 56 { 57 u64 size = obj->base.size; 58 int ret; 59 60 ret = drm_gem_handle_create(file, &obj->base, handle_p); 61 /* drop reference from allocate - handle holds it now */ 62 i915_gem_object_put(obj); 63 if (ret) 64 return ret; 65 66 *size_p = size; 67 return 0; 68 } 69 70 static int 71 i915_gem_setup(struct drm_i915_gem_object *obj, u64 size) 72 { 73 struct intel_memory_region *mr = obj->mm.placements[0]; 74 unsigned int flags; 75 int ret; 76 77 size = round_up(size, object_max_page_size(obj)); 78 if (size == 0) 79 return -EINVAL; 80 81 /* For most of the ABI (e.g. mmap) we think in system pages */ 82 GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE)); 83 84 if (i915_gem_object_size_2big(size)) 85 return -E2BIG; 86 87 /* 88 * I915_BO_ALLOC_USER will make sure the object is cleared before 89 * any user access. 90 */ 91 flags = I915_BO_ALLOC_USER; 92 93 ret = mr->ops->init_object(mr, obj, size, flags); 94 if (ret) 95 return ret; 96 97 GEM_BUG_ON(size != obj->base.size); 98 99 trace_i915_gem_object_create(obj); 100 return 0; 101 } 102 103 int 104 i915_gem_dumb_create(struct drm_file *file, 105 struct drm_device *dev, 106 struct drm_mode_create_dumb *args) 107 { 108 struct drm_i915_gem_object *obj; 109 struct intel_memory_region *mr; 110 enum intel_memory_type mem_type; 111 int cpp = DIV_ROUND_UP(args->bpp, 8); 112 u32 format; 113 int ret; 114 115 switch (cpp) { 116 case 1: 117 format = DRM_FORMAT_C8; 118 break; 119 case 2: 120 format = DRM_FORMAT_RGB565; 121 break; 122 case 4: 123 format = DRM_FORMAT_XRGB8888; 124 break; 125 default: 126 return -EINVAL; 127 } 128 129 /* have to work out size/pitch and return them */ 130 args->pitch = ALIGN(args->width * cpp, 64); 131 132 /* align stride to page size so that we can remap */ 133 if (args->pitch > intel_plane_fb_max_stride(to_i915(dev), format, 134 DRM_FORMAT_MOD_LINEAR)) 135 args->pitch = ALIGN(args->pitch, 4096); 136 137 if (args->pitch < args->width) 138 return -EINVAL; 139 140 args->size = mul_u32_u32(args->pitch, args->height); 141 142 mem_type = INTEL_MEMORY_SYSTEM; 143 if (HAS_LMEM(to_i915(dev))) 144 mem_type = INTEL_MEMORY_LOCAL; 145 146 obj = i915_gem_object_alloc(); 147 if (!obj) 148 return -ENOMEM; 149 150 mr = intel_memory_region_by_type(to_i915(dev), mem_type); 151 object_set_placements(obj, &mr, 1); 152 153 ret = i915_gem_setup(obj, args->size); 154 if (ret) 155 goto object_free; 156 157 return i915_gem_publish(obj, file, &args->size, &args->handle); 158 159 object_free: 160 i915_gem_object_free(obj); 161 return ret; 162 } 163 164 /** 165 * Creates a new mm object and returns a handle to it. 166 * @dev: drm device pointer 167 * @data: ioctl data blob 168 * @file: drm file pointer 169 */ 170 int 171 i915_gem_create_ioctl(struct drm_device *dev, void *data, 172 struct drm_file *file) 173 { 174 struct drm_i915_private *i915 = to_i915(dev); 175 struct drm_i915_gem_create *args = data; 176 struct drm_i915_gem_object *obj; 177 struct intel_memory_region *mr; 178 int ret; 179 180 i915_gem_flush_free_objects(i915); 181 182 obj = i915_gem_object_alloc(); 183 if (!obj) 184 return -ENOMEM; 185 186 mr = intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM); 187 object_set_placements(obj, &mr, 1); 188 189 ret = i915_gem_setup(obj, args->size); 190 if (ret) 191 goto object_free; 192 193 return i915_gem_publish(obj, file, &args->size, &args->handle); 194 195 object_free: 196 i915_gem_object_free(obj); 197 return ret; 198 } 199 200 struct create_ext { 201 struct drm_i915_private *i915; 202 struct drm_i915_gem_object *vanilla_object; 203 }; 204 205 static void repr_placements(char *buf, size_t size, 206 struct intel_memory_region **placements, 207 int n_placements) 208 { 209 int i; 210 211 buf[0] = '\0'; 212 213 for (i = 0; i < n_placements; i++) { 214 struct intel_memory_region *mr = placements[i]; 215 int r; 216 217 r = snprintf(buf, size, "\n %s -> { class: %d, inst: %d }", 218 mr->name, mr->type, mr->instance); 219 if (r >= size) 220 return; 221 222 buf += r; 223 size -= r; 224 } 225 } 226 227 static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args, 228 struct create_ext *ext_data) 229 { 230 struct drm_i915_private *i915 = ext_data->i915; 231 struct drm_i915_gem_memory_class_instance __user *uregions = 232 u64_to_user_ptr(args->regions); 233 struct drm_i915_gem_object *obj = ext_data->vanilla_object; 234 struct intel_memory_region **placements; 235 u32 mask; 236 int i, ret = 0; 237 238 if (args->pad) { 239 drm_dbg(&i915->drm, "pad should be zero\n"); 240 ret = -EINVAL; 241 } 242 243 if (!args->num_regions) { 244 drm_dbg(&i915->drm, "num_regions is zero\n"); 245 ret = -EINVAL; 246 } 247 248 if (args->num_regions > ARRAY_SIZE(i915->mm.regions)) { 249 drm_dbg(&i915->drm, "num_regions is too large\n"); 250 ret = -EINVAL; 251 } 252 253 if (ret) 254 return ret; 255 256 placements = kmalloc_array(args->num_regions, 257 sizeof(struct intel_memory_region *), 258 GFP_KERNEL); 259 if (!placements) 260 return -ENOMEM; 261 262 mask = 0; 263 for (i = 0; i < args->num_regions; i++) { 264 struct drm_i915_gem_memory_class_instance region; 265 struct intel_memory_region *mr; 266 267 if (copy_from_user(®ion, uregions, sizeof(region))) { 268 ret = -EFAULT; 269 goto out_free; 270 } 271 272 mr = intel_memory_region_lookup(i915, 273 region.memory_class, 274 region.memory_instance); 275 if (!mr || mr->private) { 276 drm_dbg(&i915->drm, "Device is missing region { class: %d, inst: %d } at index = %d\n", 277 region.memory_class, region.memory_instance, i); 278 ret = -EINVAL; 279 goto out_dump; 280 } 281 282 if (mask & BIT(mr->id)) { 283 drm_dbg(&i915->drm, "Found duplicate placement %s -> { class: %d, inst: %d } at index = %d\n", 284 mr->name, region.memory_class, 285 region.memory_instance, i); 286 ret = -EINVAL; 287 goto out_dump; 288 } 289 290 placements[i] = mr; 291 mask |= BIT(mr->id); 292 293 ++uregions; 294 } 295 296 if (obj->mm.placements) { 297 ret = -EINVAL; 298 goto out_dump; 299 } 300 301 object_set_placements(obj, placements, args->num_regions); 302 if (args->num_regions == 1) 303 kfree(placements); 304 305 return 0; 306 307 out_dump: 308 if (1) { 309 char buf[256]; 310 311 if (obj->mm.placements) { 312 repr_placements(buf, 313 sizeof(buf), 314 obj->mm.placements, 315 obj->mm.n_placements); 316 drm_dbg(&i915->drm, 317 "Placements were already set in previous EXT. Existing placements: %s\n", 318 buf); 319 } 320 321 repr_placements(buf, sizeof(buf), placements, i); 322 drm_dbg(&i915->drm, "New placements(so far validated): %s\n", buf); 323 } 324 325 out_free: 326 kfree(placements); 327 return ret; 328 } 329 330 static int ext_set_placements(struct i915_user_extension __user *base, 331 void *data) 332 { 333 struct drm_i915_gem_create_ext_memory_regions ext; 334 335 if (!IS_ENABLED(CONFIG_DRM_I915_UNSTABLE_FAKE_LMEM)) 336 return -ENODEV; 337 338 if (copy_from_user(&ext, base, sizeof(ext))) 339 return -EFAULT; 340 341 return set_placements(&ext, data); 342 } 343 344 static const i915_user_extension_fn create_extensions[] = { 345 [I915_GEM_CREATE_EXT_MEMORY_REGIONS] = ext_set_placements, 346 }; 347 348 /** 349 * Creates a new mm object and returns a handle to it. 350 * @dev: drm device pointer 351 * @data: ioctl data blob 352 * @file: drm file pointer 353 */ 354 int 355 i915_gem_create_ext_ioctl(struct drm_device *dev, void *data, 356 struct drm_file *file) 357 { 358 struct drm_i915_private *i915 = to_i915(dev); 359 struct drm_i915_gem_create_ext *args = data; 360 struct create_ext ext_data = { .i915 = i915 }; 361 struct intel_memory_region **placements_ext; 362 struct drm_i915_gem_object *obj; 363 int ret; 364 365 if (args->flags) 366 return -EINVAL; 367 368 i915_gem_flush_free_objects(i915); 369 370 obj = i915_gem_object_alloc(); 371 if (!obj) 372 return -ENOMEM; 373 374 ext_data.vanilla_object = obj; 375 ret = i915_user_extensions(u64_to_user_ptr(args->extensions), 376 create_extensions, 377 ARRAY_SIZE(create_extensions), 378 &ext_data); 379 placements_ext = obj->mm.placements; 380 if (ret) 381 goto object_free; 382 383 if (!placements_ext) { 384 struct intel_memory_region *mr = 385 intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM); 386 387 object_set_placements(obj, &mr, 1); 388 } 389 390 ret = i915_gem_setup(obj, args->size); 391 if (ret) 392 goto object_free; 393 394 return i915_gem_publish(obj, file, &args->size, &args->handle); 395 396 object_free: 397 if (obj->mm.n_placements > 1) 398 kfree(placements_ext); 399 i915_gem_object_free(obj); 400 return ret; 401 } 402