1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2020 Intel Corporation 4 */ 5 6 #include <drm/drm_fourcc.h> 7 8 #include "display/intel_display.h" 9 #include "gem/i915_gem_ioctls.h" 10 #include "gem/i915_gem_lmem.h" 11 #include "gem/i915_gem_region.h" 12 #include "pxp/intel_pxp.h" 13 14 #include "i915_drv.h" 15 #include "i915_gem_create.h" 16 #include "i915_trace.h" 17 #include "i915_user_extensions.h" 18 19 static u32 object_max_page_size(struct intel_memory_region **placements, 20 unsigned int n_placements) 21 { 22 u32 max_page_size = 0; 23 int i; 24 25 for (i = 0; i < n_placements; i++) { 26 struct intel_memory_region *mr = placements[i]; 27 28 GEM_BUG_ON(!is_power_of_2(mr->min_page_size)); 29 max_page_size = max_t(u32, max_page_size, mr->min_page_size); 30 } 31 32 GEM_BUG_ON(!max_page_size); 33 return max_page_size; 34 } 35 36 static int object_set_placements(struct drm_i915_gem_object *obj, 37 struct intel_memory_region **placements, 38 unsigned int n_placements) 39 { 40 struct intel_memory_region **arr; 41 unsigned int i; 42 43 GEM_BUG_ON(!n_placements); 44 45 /* 46 * For the common case of one memory region, skip storing an 47 * allocated array and just point at the region directly. 48 */ 49 if (n_placements == 1) { 50 struct intel_memory_region *mr = placements[0]; 51 struct drm_i915_private *i915 = mr->i915; 52 53 obj->mm.placements = &i915->mm.regions[mr->id]; 54 obj->mm.n_placements = 1; 55 } else { 56 arr = kmalloc_array(n_placements, 57 sizeof(struct intel_memory_region *), 58 GFP_KERNEL); 59 if (!arr) 60 return -ENOMEM; 61 62 for (i = 0; i < n_placements; i++) 63 arr[i] = placements[i]; 64 65 obj->mm.placements = arr; 66 obj->mm.n_placements = n_placements; 67 } 68 69 return 0; 70 } 71 72 static int i915_gem_publish(struct drm_i915_gem_object *obj, 73 struct drm_file *file, 74 u64 *size_p, 75 u32 *handle_p) 76 { 77 u64 size = obj->base.size; 78 int ret; 79 80 ret = drm_gem_handle_create(file, &obj->base, handle_p); 81 /* drop reference from allocate - handle holds it now */ 82 i915_gem_object_put(obj); 83 if (ret) 84 return ret; 85 86 *size_p = size; 87 return 0; 88 } 89 90 static struct drm_i915_gem_object * 91 __i915_gem_object_create_user_ext(struct drm_i915_private *i915, u64 size, 92 struct intel_memory_region **placements, 93 unsigned int n_placements, 94 unsigned int ext_flags) 95 { 96 struct intel_memory_region *mr = placements[0]; 97 struct drm_i915_gem_object *obj; 98 unsigned int flags; 99 int ret; 100 101 i915_gem_flush_free_objects(i915); 102 103 size = round_up(size, object_max_page_size(placements, n_placements)); 104 if (size == 0) 105 return ERR_PTR(-EINVAL); 106 107 /* For most of the ABI (e.g. mmap) we think in system pages */ 108 GEM_BUG_ON(!IS_ALIGNED(size, PAGE_SIZE)); 109 110 if (i915_gem_object_size_2big(size)) 111 return ERR_PTR(-E2BIG); 112 113 obj = i915_gem_object_alloc(); 114 if (!obj) 115 return ERR_PTR(-ENOMEM); 116 117 ret = object_set_placements(obj, placements, n_placements); 118 if (ret) 119 goto object_free; 120 121 /* 122 * I915_BO_ALLOC_USER will make sure the object is cleared before 123 * any user access. 124 */ 125 flags = I915_BO_ALLOC_USER; 126 127 ret = mr->ops->init_object(mr, obj, I915_BO_INVALID_OFFSET, size, 0, flags); 128 if (ret) 129 goto object_free; 130 131 GEM_BUG_ON(size != obj->base.size); 132 133 /* Add any flag set by create_ext options */ 134 obj->flags |= ext_flags; 135 136 trace_i915_gem_object_create(obj); 137 return obj; 138 139 object_free: 140 if (obj->mm.n_placements > 1) 141 kfree(obj->mm.placements); 142 i915_gem_object_free(obj); 143 return ERR_PTR(ret); 144 } 145 146 /** 147 * Creates a new object using the same path as DRM_I915_GEM_CREATE_EXT 148 * @i915: i915 private 149 * @size: size of the buffer, in bytes 150 * @placements: possible placement regions, in priority order 151 * @n_placements: number of possible placement regions 152 * 153 * This function is exposed primarily for selftests and does very little 154 * error checking. It is assumed that the set of placement regions has 155 * already been verified to be valid. 156 */ 157 struct drm_i915_gem_object * 158 __i915_gem_object_create_user(struct drm_i915_private *i915, u64 size, 159 struct intel_memory_region **placements, 160 unsigned int n_placements) 161 { 162 return __i915_gem_object_create_user_ext(i915, size, placements, 163 n_placements, 0); 164 } 165 166 int 167 i915_gem_dumb_create(struct drm_file *file, 168 struct drm_device *dev, 169 struct drm_mode_create_dumb *args) 170 { 171 struct drm_i915_gem_object *obj; 172 struct intel_memory_region *mr; 173 enum intel_memory_type mem_type; 174 int cpp = DIV_ROUND_UP(args->bpp, 8); 175 u32 format; 176 177 switch (cpp) { 178 case 1: 179 format = DRM_FORMAT_C8; 180 break; 181 case 2: 182 format = DRM_FORMAT_RGB565; 183 break; 184 case 4: 185 format = DRM_FORMAT_XRGB8888; 186 break; 187 default: 188 return -EINVAL; 189 } 190 191 /* have to work out size/pitch and return them */ 192 args->pitch = ALIGN(args->width * cpp, 64); 193 194 /* align stride to page size so that we can remap */ 195 if (args->pitch > intel_plane_fb_max_stride(to_i915(dev), format, 196 DRM_FORMAT_MOD_LINEAR)) 197 args->pitch = ALIGN(args->pitch, 4096); 198 199 if (args->pitch < args->width) 200 return -EINVAL; 201 202 args->size = mul_u32_u32(args->pitch, args->height); 203 204 mem_type = INTEL_MEMORY_SYSTEM; 205 if (HAS_LMEM(to_i915(dev))) 206 mem_type = INTEL_MEMORY_LOCAL; 207 208 mr = intel_memory_region_by_type(to_i915(dev), mem_type); 209 210 obj = __i915_gem_object_create_user(to_i915(dev), args->size, &mr, 1); 211 if (IS_ERR(obj)) 212 return PTR_ERR(obj); 213 214 return i915_gem_publish(obj, file, &args->size, &args->handle); 215 } 216 217 /** 218 * Creates a new mm object and returns a handle to it. 219 * @dev: drm device pointer 220 * @data: ioctl data blob 221 * @file: drm file pointer 222 */ 223 int 224 i915_gem_create_ioctl(struct drm_device *dev, void *data, 225 struct drm_file *file) 226 { 227 struct drm_i915_private *i915 = to_i915(dev); 228 struct drm_i915_gem_create *args = data; 229 struct drm_i915_gem_object *obj; 230 struct intel_memory_region *mr; 231 232 mr = intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM); 233 234 obj = __i915_gem_object_create_user(i915, args->size, &mr, 1); 235 if (IS_ERR(obj)) 236 return PTR_ERR(obj); 237 238 return i915_gem_publish(obj, file, &args->size, &args->handle); 239 } 240 241 struct create_ext { 242 struct drm_i915_private *i915; 243 struct intel_memory_region *placements[INTEL_REGION_UNKNOWN]; 244 unsigned int n_placements; 245 unsigned int placement_mask; 246 unsigned long flags; 247 }; 248 249 static void repr_placements(char *buf, size_t size, 250 struct intel_memory_region **placements, 251 int n_placements) 252 { 253 int i; 254 255 buf[0] = '\0'; 256 257 for (i = 0; i < n_placements; i++) { 258 struct intel_memory_region *mr = placements[i]; 259 int r; 260 261 r = snprintf(buf, size, "\n %s -> { class: %d, inst: %d }", 262 mr->name, mr->type, mr->instance); 263 if (r >= size) 264 return; 265 266 buf += r; 267 size -= r; 268 } 269 } 270 271 static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args, 272 struct create_ext *ext_data) 273 { 274 struct drm_i915_private *i915 = ext_data->i915; 275 struct drm_i915_gem_memory_class_instance __user *uregions = 276 u64_to_user_ptr(args->regions); 277 struct intel_memory_region *placements[INTEL_REGION_UNKNOWN]; 278 u32 mask; 279 int i, ret = 0; 280 281 if (args->pad) { 282 drm_dbg(&i915->drm, "pad should be zero\n"); 283 ret = -EINVAL; 284 } 285 286 if (!args->num_regions) { 287 drm_dbg(&i915->drm, "num_regions is zero\n"); 288 ret = -EINVAL; 289 } 290 291 BUILD_BUG_ON(ARRAY_SIZE(i915->mm.regions) != ARRAY_SIZE(placements)); 292 BUILD_BUG_ON(ARRAY_SIZE(ext_data->placements) != ARRAY_SIZE(placements)); 293 if (args->num_regions > ARRAY_SIZE(i915->mm.regions)) { 294 drm_dbg(&i915->drm, "num_regions is too large\n"); 295 ret = -EINVAL; 296 } 297 298 if (ret) 299 return ret; 300 301 mask = 0; 302 for (i = 0; i < args->num_regions; i++) { 303 struct drm_i915_gem_memory_class_instance region; 304 struct intel_memory_region *mr; 305 306 if (copy_from_user(®ion, uregions, sizeof(region))) 307 return -EFAULT; 308 309 mr = intel_memory_region_lookup(i915, 310 region.memory_class, 311 region.memory_instance); 312 if (!mr || mr->private) { 313 drm_dbg(&i915->drm, "Device is missing region { class: %d, inst: %d } at index = %d\n", 314 region.memory_class, region.memory_instance, i); 315 ret = -EINVAL; 316 goto out_dump; 317 } 318 319 if (mask & BIT(mr->id)) { 320 drm_dbg(&i915->drm, "Found duplicate placement %s -> { class: %d, inst: %d } at index = %d\n", 321 mr->name, region.memory_class, 322 region.memory_instance, i); 323 ret = -EINVAL; 324 goto out_dump; 325 } 326 327 placements[i] = mr; 328 mask |= BIT(mr->id); 329 330 ++uregions; 331 } 332 333 if (ext_data->n_placements) { 334 ret = -EINVAL; 335 goto out_dump; 336 } 337 338 ext_data->n_placements = args->num_regions; 339 for (i = 0; i < args->num_regions; i++) 340 ext_data->placements[i] = placements[i]; 341 342 ext_data->placement_mask = mask; 343 return 0; 344 345 out_dump: 346 if (1) { 347 char buf[256]; 348 349 if (ext_data->n_placements) { 350 repr_placements(buf, 351 sizeof(buf), 352 ext_data->placements, 353 ext_data->n_placements); 354 drm_dbg(&i915->drm, 355 "Placements were already set in previous EXT. Existing placements: %s\n", 356 buf); 357 } 358 359 repr_placements(buf, sizeof(buf), placements, i); 360 drm_dbg(&i915->drm, "New placements(so far validated): %s\n", buf); 361 } 362 363 return ret; 364 } 365 366 static int ext_set_placements(struct i915_user_extension __user *base, 367 void *data) 368 { 369 struct drm_i915_gem_create_ext_memory_regions ext; 370 371 if (copy_from_user(&ext, base, sizeof(ext))) 372 return -EFAULT; 373 374 return set_placements(&ext, data); 375 } 376 377 static int ext_set_protected(struct i915_user_extension __user *base, void *data) 378 { 379 struct drm_i915_gem_create_ext_protected_content ext; 380 struct create_ext *ext_data = data; 381 382 if (copy_from_user(&ext, base, sizeof(ext))) 383 return -EFAULT; 384 385 if (ext.flags) 386 return -EINVAL; 387 388 if (!intel_pxp_is_enabled(ext_data->i915->pxp)) 389 return -ENODEV; 390 391 ext_data->flags |= I915_BO_PROTECTED; 392 393 return 0; 394 } 395 396 static const i915_user_extension_fn create_extensions[] = { 397 [I915_GEM_CREATE_EXT_MEMORY_REGIONS] = ext_set_placements, 398 [I915_GEM_CREATE_EXT_PROTECTED_CONTENT] = ext_set_protected, 399 }; 400 401 /** 402 * Creates a new mm object and returns a handle to it. 403 * @dev: drm device pointer 404 * @data: ioctl data blob 405 * @file: drm file pointer 406 */ 407 int 408 i915_gem_create_ext_ioctl(struct drm_device *dev, void *data, 409 struct drm_file *file) 410 { 411 struct drm_i915_private *i915 = to_i915(dev); 412 struct drm_i915_gem_create_ext *args = data; 413 struct create_ext ext_data = { .i915 = i915 }; 414 struct drm_i915_gem_object *obj; 415 int ret; 416 417 if (args->flags & ~I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS) 418 return -EINVAL; 419 420 ret = i915_user_extensions(u64_to_user_ptr(args->extensions), 421 create_extensions, 422 ARRAY_SIZE(create_extensions), 423 &ext_data); 424 if (ret) 425 return ret; 426 427 if (!ext_data.n_placements) { 428 ext_data.placements[0] = 429 intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM); 430 ext_data.n_placements = 1; 431 } 432 433 if (args->flags & I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS) { 434 if (ext_data.n_placements == 1) 435 return -EINVAL; 436 437 /* 438 * We always need to be able to spill to system memory, if we 439 * can't place in the mappable part of LMEM. 440 */ 441 if (!(ext_data.placement_mask & BIT(INTEL_REGION_SMEM))) 442 return -EINVAL; 443 } else { 444 if (ext_data.n_placements > 1 || 445 ext_data.placements[0]->type != INTEL_MEMORY_SYSTEM) 446 ext_data.flags |= I915_BO_ALLOC_GPU_ONLY; 447 } 448 449 obj = __i915_gem_object_create_user_ext(i915, args->size, 450 ext_data.placements, 451 ext_data.n_placements, 452 ext_data.flags); 453 if (IS_ERR(obj)) 454 return PTR_ERR(obj); 455 456 return i915_gem_publish(obj, file, &args->size, &args->handle); 457 } 458