Hi Jérôme, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v4.19-rc3 next-20180910] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/jglisse-redhat-com/Getting-rid-of-GUP-and-use-HMM-for-user-ptr-features/20180911-020741 config: x86_64-randconfig-x000-201836 (attached as .config) compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All errors (new ones prefixed by >>): drivers/gpu/drm/radeon/radeon_mn.c:43:20: error: field 'mirror' has incomplete type struct hmm_mirror mirror; ^~~~~~ drivers/gpu/drm/radeon/radeon_mn.c: In function 'radeon_mn_destroy': drivers/gpu/drm/radeon/radeon_mn.c:90:2: error: implicit declaration of function 'hmm_mirror_unregister'; did you mean 'drm_dp_aux_unregister'? [-Werror=implicit-function-declaration] hmm_mirror_unregister(&rmn->mirror); ^~~~~~~~~~~~~~~~~~~~~ drm_dp_aux_unregister In file included from include/linux/firmware.h:6:0, from drivers/gpu/drm/radeon/radeon_mn.c:31: drivers/gpu/drm/radeon/radeon_mn.c: In function 'radeon_mirror_release': include/linux/kernel.h:997:32: error: dereferencing pointer to incomplete type 'struct hmm_mirror' BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \ ^~~~~~ include/linux/compiler.h:335:18: note: in definition of macro '__compiletime_assert' int __cond = !(condition); \ ^~~~~~~~~ include/linux/compiler.h:358:2: note: in expansion of macro '_compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__) ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:45:37: note: in expansion of macro 'compiletime_assert' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^~~~~~~~~~~~~~~~~~ include/linux/kernel.h:997:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \ ^~~~~~~~~~~~~~~~ include/linux/kernel.h:997:20: note: in expansion of macro '__same_type' BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \ ^~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_mn.c:103:26: note: in expansion of macro 'container_of' struct radeon_mn *rmn = container_of(mirror, struct radeon_mn, mirror); ^~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_mn.c: At top level: drivers/gpu/drm/radeon/radeon_mn.c:119:24: warning: 'struct hmm_update' declared inside parameter list will not be visible outside of this definition or declaration const struct hmm_update *update) ^~~~~~~~~~ drivers/gpu/drm/radeon/radeon_mn.c: In function 'radeon_sync_cpu_device_pagetables': drivers/gpu/drm/radeon/radeon_mn.c:128:14: error: dereferencing pointer to incomplete type 'const struct hmm_update' end = update->end - 1; ^~ drivers/gpu/drm/radeon/radeon_mn.c: At top level: drivers/gpu/drm/radeon/radeon_mn.c:183:21: error: variable 'radeon_mirror_ops' has initializer but incomplete type static const struct hmm_mirror_ops radeon_mirror_ops = { ^~~~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_mn.c:184:3: error: 'const struct hmm_mirror_ops' has no member named 'sync_cpu_device_pagetables' .sync_cpu_device_pagetables = &radeon_sync_cpu_device_pagetables, ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_mn.c:184:32: warning: excess elements in struct initializer .sync_cpu_device_pagetables = &radeon_sync_cpu_device_pagetables, ^ drivers/gpu/drm/radeon/radeon_mn.c:184:32: note: (near initialization for 'radeon_mirror_ops') drivers/gpu/drm/radeon/radeon_mn.c:185:3: error: 'const struct hmm_mirror_ops' has no member named 'release' .release = &radeon_mirror_release, ^~~~~~~ drivers/gpu/drm/radeon/radeon_mn.c:185:13: warning: excess elements in struct initializer .release = &radeon_mirror_release, ^ drivers/gpu/drm/radeon/radeon_mn.c:185:13: note: (near initialization for 'radeon_mirror_ops') drivers/gpu/drm/radeon/radeon_mn.c: In function 'radeon_mn_get': drivers/gpu/drm/radeon/radeon_mn.c:224:6: error: implicit declaration of function 'hmm_mirror_register'; did you mean 'drm_dp_aux_register'? [-Werror=implicit-function-declaration] r = hmm_mirror_register(&new->mirror, mm); ^~~~~~~~~~~~~~~~~~~ drm_dp_aux_register drivers/gpu/drm/radeon/radeon_mn.c: In function 'radeon_mn_bo_map': >> drivers/gpu/drm/radeon/radeon_mn.c:373:43: error: 'HMM_PFN_FLAG_MAX' undeclared (first use in this function); did you mean 'TTM_PL_FLAG_TT'? static const uint64_t radeon_range_flags[HMM_PFN_FLAG_MAX] = { ^~~~~~~~~~~~~~~~ TTM_PL_FLAG_TT drivers/gpu/drm/radeon/radeon_mn.c:373:43: note: each undeclared identifier is reported only once for each function it appears in drivers/gpu/drm/radeon/radeon_mn.c:378:44: error: 'HMM_PFN_VALUE_MAX' undeclared (first use in this function); did you mean 'HMM_PFN_FLAG_MAX'? static const uint64_t radeon_range_values[HMM_PFN_VALUE_MAX] = { ^~~~~~~~~~~~~~~~~ HMM_PFN_FLAG_MAX drivers/gpu/drm/radeon/radeon_mn.c:389:19: error: storage size of 'range' isn't known struct hmm_range range; ^~~~~ drivers/gpu/drm/radeon/radeon_mn.c:421:31: error: 'HMM_PFN_VALID' undeclared (first use in this function); did you mean 'HMM_PFN_VALUE_MAX'? range.pfns[i] = range.flags[HMM_PFN_VALID]; ^~~~~~~~~~~~~ HMM_PFN_VALUE_MAX drivers/gpu/drm/radeon/radeon_mn.c:422:40: error: 'HMM_PFN_WRITE' undeclared (first use in this function); did you mean 'HMM_PFN_VALID'? range.pfns[i] |= write ? range.flags[HMM_PFN_WRITE] : 0; ^~~~~~~~~~~~~ HMM_PFN_VALID drivers/gpu/drm/radeon/radeon_mn.c:425:8: error: implicit declaration of function 'hmm_vma_fault'; did you mean 'filemap_fault'? [-Werror=implicit-function-declaration] ret = hmm_vma_fault(&range, true); ^~~~~~~~~~~~~ filemap_fault drivers/gpu/drm/radeon/radeon_mn.c:430:23: error: implicit declaration of function 'hmm_pfn_to_page'; did you mean '__pfn_to_page'? [-Werror=implicit-function-declaration] struct page *page = hmm_pfn_to_page(&range, range.pfns[i]); ^~~~~~~~~~~~~~~ __pfn_to_page drivers/gpu/drm/radeon/radeon_mn.c:446:4: error: implicit declaration of function 'hmm_vma_range_done'; did you mean 'drm_vma_node_size'? [-Werror=implicit-function-declaration] hmm_vma_range_done(&range); ^~~~~~~~~~~~~~~~~~ drm_vma_node_size drivers/gpu/drm/radeon/radeon_mn.c:389:19: warning: unused variable 'range' [-Wunused-variable] struct hmm_range range; ^~~~~ drivers/gpu/drm/radeon/radeon_mn.c:378:24: warning: unused variable 'radeon_range_values' [-Wunused-variable] static const uint64_t radeon_range_values[HMM_PFN_VALUE_MAX] = { ^~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_mn.c:373:24: warning: unused variable 'radeon_range_flags' [-Wunused-variable] static const uint64_t radeon_range_flags[HMM_PFN_FLAG_MAX] = { ^~~~~~~~~~~~~~~~~~ drivers/gpu/drm/radeon/radeon_mn.c: At top level: drivers/gpu/drm/radeon/radeon_mn.c:183:36: error: storage size of 'radeon_mirror_ops' isn't known static const struct hmm_mirror_ops radeon_mirror_ops = { ^~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +373 drivers/gpu/drm/radeon/radeon_mn.c 182 183 static const struct hmm_mirror_ops radeon_mirror_ops = { 184 .sync_cpu_device_pagetables = &radeon_sync_cpu_device_pagetables, > 185 .release = &radeon_mirror_release, 186 }; 187 188 /** 189 * radeon_mn_get - create notifier context 190 * 191 * @rdev: radeon device pointer 192 * 193 * Creates a notifier context for current->mm. 194 */ 195 static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev) 196 { 197 struct mm_struct *mm = current->mm; 198 struct radeon_mn *rmn, *new; 199 int r; 200 201 mutex_lock(&rdev->mn_lock); 202 hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm) { 203 if (rmn->mm == mm) { 204 mutex_unlock(&rdev->mn_lock); 205 return rmn; 206 } 207 } 208 mutex_unlock(&rdev->mn_lock); 209 210 new = kzalloc(sizeof(*rmn), GFP_KERNEL); 211 if (!new) { 212 return ERR_PTR(-ENOMEM); 213 } 214 new->mm = mm; 215 new->rdev = rdev; 216 mutex_init(&new->lock); 217 new->objects = RB_ROOT_CACHED; 218 new->mirror.ops = &radeon_mirror_ops; 219 220 if (down_write_killable(&mm->mmap_sem)) { 221 kfree(new); 222 return ERR_PTR(-EINTR); 223 } 224 r = hmm_mirror_register(&new->mirror, mm); 225 up_write(&mm->mmap_sem); 226 if (r) { 227 kfree(new); 228 return ERR_PTR(r); 229 } 230 231 mutex_lock(&rdev->mn_lock); 232 /* Check again in case some other thread raced with us ... */ 233 hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm) { 234 if (rmn->mm == mm) { 235 mutex_unlock(&rdev->mn_lock); 236 hmm_mirror_unregister(&new->mirror); 237 kfree(new); 238 return rmn; 239 } 240 } 241 hash_add(rdev->mn_hash, &new->node, (unsigned long)mm); 242 mutex_unlock(&rdev->mn_lock); 243 244 return new; 245 } 246 247 /** 248 * radeon_mn_register - register a BO for notifier updates 249 * 250 * @bo: radeon buffer object 251 * @addr: userptr addr we should monitor 252 * 253 * Registers an MMU notifier for the given BO at the specified address. 254 * Returns 0 on success, -ERRNO if anything goes wrong. 255 */ 256 int radeon_mn_register(struct radeon_bo *bo, unsigned long addr) 257 { 258 unsigned long end = addr + radeon_bo_size(bo) - 1; 259 struct radeon_device *rdev = bo->rdev; 260 struct radeon_mn *rmn; 261 struct radeon_mn_node *node = NULL; 262 struct list_head bos; 263 struct interval_tree_node *it; 264 265 bo->userptr = addr; 266 bo->pfns = kvmalloc_array(bo->tbo.num_pages, sizeof(uint64_t), 267 GFP_KERNEL | __GFP_ZERO); 268 if (bo->pfns == NULL) 269 return -ENOMEM; 270 271 rmn = radeon_mn_get(rdev); 272 if (IS_ERR(rmn)) { 273 kvfree(bo->pfns); 274 bo->pfns = NULL; 275 return PTR_ERR(rmn); 276 } 277 278 INIT_LIST_HEAD(&bos); 279 280 mutex_lock(&rmn->lock); 281 282 while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) { 283 kfree(node); 284 node = container_of(it, struct radeon_mn_node, it); 285 interval_tree_remove(&node->it, &rmn->objects); 286 addr = min(it->start, addr); 287 end = max(it->last, end); 288 list_splice(&node->bos, &bos); 289 } 290 291 if (!node) { 292 node = kmalloc(sizeof(struct radeon_mn_node), GFP_KERNEL); 293 if (!node) { 294 mutex_unlock(&rmn->lock); 295 kvfree(bo->pfns); 296 bo->pfns = NULL; 297 return -ENOMEM; 298 } 299 } 300 301 bo->mn = rmn; 302 303 node->it.start = addr; 304 node->it.last = end; 305 INIT_LIST_HEAD(&node->bos); 306 list_splice(&bos, &node->bos); 307 list_add(&bo->mn_list, &node->bos); 308 309 interval_tree_insert(&node->it, &rmn->objects); 310 311 mutex_unlock(&rmn->lock); 312 313 return 0; 314 } 315 316 /** 317 * radeon_mn_unregister - unregister a BO for notifier updates 318 * 319 * @bo: radeon buffer object 320 * 321 * Remove any registration of MMU notifier updates from the buffer object. 322 */ 323 void radeon_mn_unregister(struct radeon_bo *bo) 324 { 325 struct radeon_device *rdev = bo->rdev; 326 struct radeon_mn *rmn; 327 struct list_head *head; 328 329 mutex_lock(&rdev->mn_lock); 330 rmn = bo->mn; 331 if (rmn == NULL) { 332 mutex_unlock(&rdev->mn_lock); 333 return; 334 } 335 336 mutex_lock(&rmn->lock); 337 /* save the next list entry for later */ 338 head = bo->mn_list.next; 339 340 bo->mn = NULL; 341 list_del(&bo->mn_list); 342 343 if (list_empty(head)) { 344 struct radeon_mn_node *node; 345 node = container_of(head, struct radeon_mn_node, bos); 346 interval_tree_remove(&node->it, &rmn->objects); 347 kfree(node); 348 } 349 350 mutex_unlock(&rmn->lock); 351 mutex_unlock(&rdev->mn_lock); 352 353 kvfree(bo->pfns); 354 bo->pfns = NULL; 355 } 356 357 /** 358 * radeon_mn_bo_map - map range of virtual address as buffer object 359 * 360 * @bo: radeon buffer object 361 * @ttm: ttm_tt object in which holds mirroring result 362 * @write: can GPU write to the range ? 363 * Returns: 0 on success, error code otherwise 364 * 365 * Use HMM to mirror a range of virtual address as a buffer object mapped into 366 * GPU address space (thus allowing transparent GPU access to this range). It 367 * does not pin pages for range but rely on HMM and underlying synchronizations 368 * to make sure that both CPU and GPU points to same physical memory for the 369 * range. 370 */ 371 int radeon_mn_bo_map(struct radeon_bo *bo, struct ttm_dma_tt *dma, bool write) 372 { > 373 static const uint64_t radeon_range_flags[HMM_PFN_FLAG_MAX] = { 374 (1 << 0), /* HMM_PFN_VALID */ 375 (1 << 1), /* HMM_PFN_WRITE */ 376 0 /* HMM_PFN_DEVICE_PRIVATE */ 377 }; 378 static const uint64_t radeon_range_values[HMM_PFN_VALUE_MAX] = { 379 0xfffffffffffffffeUL, /* HMM_PFN_ERROR */ 380 0, /* HMM_PFN_NONE */ 381 0xfffffffffffffffcUL /* HMM_PFN_SPECIAL */ 382 }; 383 384 unsigned long i, npages = bo->tbo.num_pages; 385 enum dma_data_direction direction = write ? 386 DMA_BIDIRECTIONAL : DMA_TO_DEVICE; 387 struct radeon_device *rdev = bo->rdev; 388 struct ttm_tt *ttm = &dma->ttm; 389 struct hmm_range range; 390 struct radeon_mn *rmn; 391 int ret; 392 393 /* 394 * FIXME This whole protection shouldn't be needed as we should only 395 * reach that code with a valid reserved bo that can not under go a 396 * concurrent radeon_mn_unregister(). 397 */ 398 mutex_lock(&rdev->mn_lock); 399 if (bo->mn == NULL) { 400 mutex_unlock(&rdev->mn_lock); 401 return -EINVAL; 402 } 403 rmn = bo->mn; 404 mutex_unlock(&rdev->mn_lock); 405 406 range.pfn_shift = 12; 407 range.pfns = bo->pfns; 408 range.start = bo->userptr; 409 range.flags = radeon_range_flags; 410 range.values = radeon_range_values; 411 range.end = bo->userptr + radeon_bo_size(bo); 412 413 range.vma = find_vma(rmn->mm, bo->userptr); 414 if (!range.vma || range.vma->vm_file || range.vma->vm_end < range.end) 415 return -EPERM; 416 417 memset(ttm->pages, 0, sizeof(void*) * npages); 418 419 again: 420 for (i = 0; i < npages; ++i) { 421 range.pfns[i] = range.flags[HMM_PFN_VALID]; 422 range.pfns[i] |= write ? range.flags[HMM_PFN_WRITE] : 0; 423 } 424 425 ret = hmm_vma_fault(&range, true); 426 if (ret) 427 goto err_unmap; 428 429 for (i = 0; i < npages; ++i) { 430 struct page *page = hmm_pfn_to_page(&range, range.pfns[i]); 431 432 if (page == NULL) 433 goto again; 434 435 if (ttm->pages[i] == page) 436 continue; 437 438 if (ttm->pages[i]) 439 dma_unmap_page(rdev->dev, dma->dma_address[i], 440 PAGE_SIZE, direction); 441 ttm->pages[i] = page; 442 443 dma->dma_address[i] = dma_map_page(rdev->dev, page, 0, 444 PAGE_SIZE, direction); 445 if (dma_mapping_error(rdev->dev, dma->dma_address[i])) { 446 hmm_vma_range_done(&range); 447 ttm->pages[i] = NULL; 448 ret = -ENOMEM; 449 goto err_unmap; 450 } 451 } 452 453 /* 454 * Taking rmn->lock is not necessary here as we are protected from any 455 * concurrent invalidation through ttm object reservation. Involved 456 * functions: radeon_sync_cpu_device_pagetables() 457 * radeon_bo_list_validate() 458 * radeon_gem_userptr_ioctl() 459 */ 460 if (!hmm_vma_range_done(&range)) 461 goto again; 462 463 return 0; 464 465 err_unmap: 466 radeon_mn_bo_unmap(bo, dma, write); 467 return ret; 468 } 469 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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