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 * __i915_gem_object_create_user - Creates a new object using the same path as 148 * DRM_I915_GEM_CREATE_EXT 149 * @i915: i915 private 150 * @size: size of the buffer, in bytes 151 * @placements: possible placement regions, in priority order 152 * @n_placements: number of possible placement regions 153 * 154 * This function is exposed primarily for selftests and does very little 155 * error checking. It is assumed that the set of placement regions has 156 * already been verified to be valid. 157 */ 158 struct drm_i915_gem_object * 159 __i915_gem_object_create_user(struct drm_i915_private *i915, u64 size, 160 struct intel_memory_region **placements, 161 unsigned int n_placements) 162 { 163 return __i915_gem_object_create_user_ext(i915, size, placements, 164 n_placements, 0); 165 } 166 167 int 168 i915_gem_dumb_create(struct drm_file *file, 169 struct drm_device *dev, 170 struct drm_mode_create_dumb *args) 171 { 172 struct drm_i915_gem_object *obj; 173 struct intel_memory_region *mr; 174 enum intel_memory_type mem_type; 175 int cpp = DIV_ROUND_UP(args->bpp, 8); 176 u32 format; 177 178 switch (cpp) { 179 case 1: 180 format = DRM_FORMAT_C8; 181 break; 182 case 2: 183 format = DRM_FORMAT_RGB565; 184 break; 185 case 4: 186 format = DRM_FORMAT_XRGB8888; 187 break; 188 default: 189 return -EINVAL; 190 } 191 192 /* have to work out size/pitch and return them */ 193 args->pitch = ALIGN(args->width * cpp, 64); 194 195 /* align stride to page size so that we can remap */ 196 if (args->pitch > intel_plane_fb_max_stride(to_i915(dev), format, 197 DRM_FORMAT_MOD_LINEAR)) 198 args->pitch = ALIGN(args->pitch, 4096); 199 200 if (args->pitch < args->width) 201 return -EINVAL; 202 203 args->size = mul_u32_u32(args->pitch, args->height); 204 205 mem_type = INTEL_MEMORY_SYSTEM; 206 if (HAS_LMEM(to_i915(dev))) 207 mem_type = INTEL_MEMORY_LOCAL; 208 209 mr = intel_memory_region_by_type(to_i915(dev), mem_type); 210 211 obj = __i915_gem_object_create_user(to_i915(dev), args->size, &mr, 1); 212 if (IS_ERR(obj)) 213 return PTR_ERR(obj); 214 215 return i915_gem_publish(obj, file, &args->size, &args->handle); 216 } 217 218 /** 219 * i915_gem_create_ioctl - Creates a new mm object and returns a handle to it. 220 * @dev: drm device pointer 221 * @data: ioctl data blob 222 * @file: drm file pointer 223 */ 224 int 225 i915_gem_create_ioctl(struct drm_device *dev, void *data, 226 struct drm_file *file) 227 { 228 struct drm_i915_private *i915 = to_i915(dev); 229 struct drm_i915_gem_create *args = data; 230 struct drm_i915_gem_object *obj; 231 struct intel_memory_region *mr; 232 233 mr = intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM); 234 235 obj = __i915_gem_object_create_user(i915, args->size, &mr, 1); 236 if (IS_ERR(obj)) 237 return PTR_ERR(obj); 238 239 return i915_gem_publish(obj, file, &args->size, &args->handle); 240 } 241 242 struct create_ext { 243 struct drm_i915_private *i915; 244 struct intel_memory_region *placements[INTEL_REGION_UNKNOWN]; 245 unsigned int n_placements; 246 unsigned int placement_mask; 247 unsigned long flags; 248 }; 249 250 static void repr_placements(char *buf, size_t size, 251 struct intel_memory_region **placements, 252 int n_placements) 253 { 254 int i; 255 256 buf[0] = '\0'; 257 258 for (i = 0; i < n_placements; i++) { 259 struct intel_memory_region *mr = placements[i]; 260 int r; 261 262 r = snprintf(buf, size, "\n %s -> { class: %d, inst: %d }", 263 mr->name, mr->type, mr->instance); 264 if (r >= size) 265 return; 266 267 buf += r; 268 size -= r; 269 } 270 } 271 272 static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args, 273 struct create_ext *ext_data) 274 { 275 struct drm_i915_private *i915 = ext_data->i915; 276 struct drm_i915_gem_memory_class_instance __user *uregions = 277 u64_to_user_ptr(args->regions); 278 struct intel_memory_region *placements[INTEL_REGION_UNKNOWN]; 279 u32 mask; 280 int i, ret = 0; 281 282 if (args->pad) { 283 drm_dbg(&i915->drm, "pad should be zero\n"); 284 ret = -EINVAL; 285 } 286 287 if (!args->num_regions) { 288 drm_dbg(&i915->drm, "num_regions is zero\n"); 289 ret = -EINVAL; 290 } 291 292 BUILD_BUG_ON(ARRAY_SIZE(i915->mm.regions) != ARRAY_SIZE(placements)); 293 BUILD_BUG_ON(ARRAY_SIZE(ext_data->placements) != ARRAY_SIZE(placements)); 294 if (args->num_regions > ARRAY_SIZE(i915->mm.regions)) { 295 drm_dbg(&i915->drm, "num_regions is too large\n"); 296 ret = -EINVAL; 297 } 298 299 if (ret) 300 return ret; 301 302 mask = 0; 303 for (i = 0; i < args->num_regions; i++) { 304 struct drm_i915_gem_memory_class_instance region; 305 struct intel_memory_region *mr; 306 307 if (copy_from_user(®ion, uregions, sizeof(region))) 308 return -EFAULT; 309 310 mr = intel_memory_region_lookup(i915, 311 region.memory_class, 312 region.memory_instance); 313 if (!mr || mr->private) { 314 drm_dbg(&i915->drm, "Device is missing region { class: %d, inst: %d } at index = %d\n", 315 region.memory_class, region.memory_instance, i); 316 ret = -EINVAL; 317 goto out_dump; 318 } 319 320 if (mask & BIT(mr->id)) { 321 drm_dbg(&i915->drm, "Found duplicate placement %s -> { class: %d, inst: %d } at index = %d\n", 322 mr->name, region.memory_class, 323 region.memory_instance, i); 324 ret = -EINVAL; 325 goto out_dump; 326 } 327 328 placements[i] = mr; 329 mask |= BIT(mr->id); 330 331 ++uregions; 332 } 333 334 if (ext_data->n_placements) { 335 ret = -EINVAL; 336 goto out_dump; 337 } 338 339 ext_data->n_placements = args->num_regions; 340 for (i = 0; i < args->num_regions; i++) 341 ext_data->placements[i] = placements[i]; 342 343 ext_data->placement_mask = mask; 344 return 0; 345 346 out_dump: 347 if (1) { 348 char buf[256]; 349 350 if (ext_data->n_placements) { 351 repr_placements(buf, 352 sizeof(buf), 353 ext_data->placements, 354 ext_data->n_placements); 355 drm_dbg(&i915->drm, 356 "Placements were already set in previous EXT. Existing placements: %s\n", 357 buf); 358 } 359 360 repr_placements(buf, sizeof(buf), placements, i); 361 drm_dbg(&i915->drm, "New placements(so far validated): %s\n", buf); 362 } 363 364 return ret; 365 } 366 367 static int ext_set_placements(struct i915_user_extension __user *base, 368 void *data) 369 { 370 struct drm_i915_gem_create_ext_memory_regions ext; 371 372 if (copy_from_user(&ext, base, sizeof(ext))) 373 return -EFAULT; 374 375 return set_placements(&ext, data); 376 } 377 378 static int ext_set_protected(struct i915_user_extension __user *base, void *data) 379 { 380 struct drm_i915_gem_create_ext_protected_content ext; 381 struct create_ext *ext_data = data; 382 383 if (copy_from_user(&ext, base, sizeof(ext))) 384 return -EFAULT; 385 386 if (ext.flags) 387 return -EINVAL; 388 389 if (!intel_pxp_is_enabled(ext_data->i915->pxp)) 390 return -ENODEV; 391 392 ext_data->flags |= I915_BO_PROTECTED; 393 394 return 0; 395 } 396 397 static const i915_user_extension_fn create_extensions[] = { 398 [I915_GEM_CREATE_EXT_MEMORY_REGIONS] = ext_set_placements, 399 [I915_GEM_CREATE_EXT_PROTECTED_CONTENT] = ext_set_protected, 400 }; 401 402 /** 403 * i915_gem_create_ext_ioctl - Creates a new mm object and returns a handle to it. 404 * @dev: drm device pointer 405 * @data: ioctl data blob 406 * @file: drm file pointer 407 */ 408 int 409 i915_gem_create_ext_ioctl(struct drm_device *dev, void *data, 410 struct drm_file *file) 411 { 412 struct drm_i915_private *i915 = to_i915(dev); 413 struct drm_i915_gem_create_ext *args = data; 414 struct create_ext ext_data = { .i915 = i915 }; 415 struct drm_i915_gem_object *obj; 416 int ret; 417 418 if (args->flags & ~I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS) 419 return -EINVAL; 420 421 ret = i915_user_extensions(u64_to_user_ptr(args->extensions), 422 create_extensions, 423 ARRAY_SIZE(create_extensions), 424 &ext_data); 425 if (ret) 426 return ret; 427 428 if (!ext_data.n_placements) { 429 ext_data.placements[0] = 430 intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM); 431 ext_data.n_placements = 1; 432 } 433 434 if (args->flags & I915_GEM_CREATE_EXT_FLAG_NEEDS_CPU_ACCESS) { 435 if (ext_data.n_placements == 1) 436 return -EINVAL; 437 438 /* 439 * We always need to be able to spill to system memory, if we 440 * can't place in the mappable part of LMEM. 441 */ 442 if (!(ext_data.placement_mask & BIT(INTEL_REGION_SMEM))) 443 return -EINVAL; 444 } else { 445 if (ext_data.n_placements > 1 || 446 ext_data.placements[0]->type != INTEL_MEMORY_SYSTEM) 447 ext_data.flags |= I915_BO_ALLOC_GPU_ONLY; 448 } 449 450 obj = __i915_gem_object_create_user_ext(i915, args->size, 451 ext_data.placements, 452 ext_data.n_placements, 453 ext_data.flags); 454 if (IS_ERR(obj)) 455 return PTR_ERR(obj); 456 457 return i915_gem_publish(obj, file, &args->size, &args->handle); 458 } 459