tree: git://anongit.freedesktop.org/drm-intel for-linux-next-fixes head: 72872c99b6dbc80362965cd30489c849f0663140 commit: 72872c99b6dbc80362965cd30489c849f0663140 [7/7] drm/i915: Check PIN_NONFAULT overlaps in evict_for_node config: x86_64-randconfig-x011-201741 (attached as .config) compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901 reproduce: git checkout 72872c99b6dbc80362965cd30489c849f0663140 # save the attached .config to linux build tree make ARCH=x86_64

All warnings (new ones prefixed by >>):

In file included from include/uapi/linux/stddef.h:1:0, from include/linux/stddef.h:4, from include/uapi/linux/posix_types.h:4, from include/uapi/linux/types.h:13, from include/linux/types.h:5, from include/linux/list.h:4, from include/linux/agp_backend.h:33, from include/drm/drmP.h:35, from drivers/gpu/drm/i915/i915_gem_evict.c:29: drivers/gpu/drm/i915/i915_gem_evict.c: In function 'i915_gem_evict_for_node': drivers/gpu/drm/i915/i915_gem_evict.c:318:31: error: implicit declaration of function 'i915_vma_has_userfault' [-Werror=implicit-function-declaration] if (flags & PIN_NONFAULT && i915_vma_has_userfault(vma)) { ^ include/linux/compiler.h:156:30: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^~~~

...

drivers/gpu/drm/i915/i915_gem_evict.c:318:3: note: in expansion of macro 'if'

if (flags & PIN_NONFAULT && i915_vma_has_userfault(vma)) { ^~ cc1: some warnings being treated as errors

vim +/if +318 drivers/gpu/drm/i915/i915_gem_evict.c

236 237 /** 238 * i915_gem_evict_for_vma - Evict vmas to make room for binding a new one 239 * @vm: address space to evict from 240 * @target: range (and color) to evict for 241 * @flags: additional flags to control the eviction algorithm 242 * 243 * This function will try to evict vmas that overlap the target node. 244 * 245 * To clarify: This is for freeing up virtual address space, not for freeing 246 * memory in e.g. the shrinker. 247 */ 248 int i915_gem_evict_for_node(struct i915_address_space *vm, 249 struct drm_mm_node *target, 250 unsigned int flags) 251 { 252 LIST_HEAD(eviction_list); 253 struct drm_mm_node *node; 254 u64 start = target->start; 255 u64 end = start + target->size; 256 struct i915_vma *vma, *next; 257 bool check_color; 258 int ret = 0; 259 260 lockdep_assert_held(&vm->i915->drm.struct_mutex); 261 GEM_BUG_ON(!IS_ALIGNED(start, I915_GTT_PAGE_SIZE)); 262 GEM_BUG_ON(!IS_ALIGNED(end, I915_GTT_PAGE_SIZE)); 263 264 trace_i915_gem_evict_node(vm, target, flags); 265 266 /* Retire before we search the active list. Although we have 267 * reasonable accuracy in our retirement lists, we may have 268 * a stray pin (preventing eviction) that can only be resolved by 269 * retiring. 270 */ 271 if (!(flags & PIN_NONBLOCK)) 272 i915_gem_retire_requests(vm->i915); 273 274 check_color = vm->mm.color_adjust; 275 if (check_color) { 276 /* Expand search to cover neighbouring guard pages (or lack!) */ 277 if (start) 278 start -= I915_GTT_PAGE_SIZE; 279 280 /* Always look at the page afterwards to avoid the end-of-GTT */ 281 end += I915_GTT_PAGE_SIZE; 282 } 283 GEM_BUG_ON(start >= end); 284 285 drm_mm_for_each_node_in_range(node, &vm->mm, start, end) { 286 /* If we find any non-objects (!vma), we cannot evict them */ 287 if (node->color == I915_COLOR_UNEVICTABLE) { 288 ret = -ENOSPC; 289 break; 290 } 291 292 GEM_BUG_ON(!node->allocated); 293 vma = container_of(node, typeof(*vma), node); 294 295 /* If we are using coloring to insert guard pages between 296 * different cache domains within the address space, we have 297 * to check whether the objects on either side of our range 298 * abutt and conflict. If they are in conflict, then we evict 299 * those as well to make room for our guard pages. 300 */ 301 if (check_color) { 302 if (node->start + node->size == target->start) { 303 if (node->color == target->color) 304 continue; 305 } 306 if (node->start == target->start + target->size) { 307 if (node->color == target->color) 308 continue; 309 } 310 } 311 312 if (flags & PIN_NONBLOCK && 313 (i915_vma_is_pinned(vma) || i915_vma_is_active(vma))) { 314 ret = -ENOSPC; 315 break; 316 } 317

318 if (flags & PIN_NONFAULT && i915_vma_has_userfault(vma)) {

319 ret = -ENOSPC; 320 break; 321 } 322 323 /* Overlap of objects in the same batch? */ 324 if (i915_vma_is_pinned(vma)) { 325 ret = -ENOSPC; 326 if (vma->exec_flags && 327 *vma->exec_flags & EXEC_OBJECT_PINNED) 328 ret = -EINVAL; 329 break; 330 } 331 332 /* Never show fear in the face of dragons! 333 * 334 * We cannot directly remove this node from within this 335 * iterator and as with i915_gem_evict_something() we employ 336 * the vma pin_count in order to prevent the action of 337 * unbinding one vma from freeing (by dropping its active 338 * reference) another in our eviction list. 339 */ 340 __i915_vma_pin(vma); 341 list_add(&vma->evict_link, &eviction_list); 342 } 343 344 list_for_each_entry_safe(vma, next, &eviction_list, evict_link) { 345 __i915_vma_unpin(vma); 346 if (ret == 0) 347 ret = i915_vma_unbind(vma); 348 } 349 350 return ret; 351 } 352

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