tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: a29fc03bd0ddaf7388cf31604ef5bd9807585109 commit: 80e4e47da66d941f2265d9d6c449880553254119 [3098/3098] iommu/ummu-core: support IOVA on demand mapping config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20251104/202511040647.7fLTNmOG-lkp@i...) compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251104/202511040647.7fLTNmOG-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202511040647.7fLTNmOG-lkp@intel.com/ All warnings (new ones prefixed by >>):

...

drivers/iommu/hisilicon/ummu-core/core_iova.c:252:19: warning: no previous prototype for function 'dma_alloc_iova' [-Wmissing-prototypes] 252 | struct iova_slot *dma_alloc_iova(struct device *dev, size_t size, | ^ drivers/iommu/hisilicon/ummu-core/core_iova.c:252:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 252 | struct iova_slot *dma_alloc_iova(struct device *dev, size_t size, | ^ | static drivers/iommu/hisilicon/ummu-core/core_iova.c:290:6: warning: no previous prototype for function 'dma_free_iova' [-Wmissing-prototypes] 290 | void dma_free_iova(struct iova_slot *slot) | ^ drivers/iommu/hisilicon/ummu-core/core_iova.c:290:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 290 | void dma_free_iova(struct iova_slot *slot) | ^ | static drivers/iommu/hisilicon/ummu-core/core_iova.c:298:5: warning: no previous prototype for function 'ummu_fill_pages' [-Wmissing-prototypes] 298 | int ummu_fill_pages(struct iova_slot *slot, dma_addr_t iova, unsigned long nr_pages) | ^ drivers/iommu/hisilicon/ummu-core/core_iova.c:298:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 298 | int ummu_fill_pages(struct iova_slot *slot, dma_addr_t iova, unsigned long nr_pages) | ^ | static drivers/iommu/hisilicon/ummu-core/core_iova.c:333:5: warning: no previous prototype for function 'ummu_drain_pages' [-Wmissing-prototypes] 333 | int ummu_drain_pages(struct iova_slot *slot, dma_addr_t iova, unsigned long nr_pages) | ^ drivers/iommu/hisilicon/ummu-core/core_iova.c:333:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 333 | int ummu_drain_pages(struct iova_slot *slot, dma_addr_t iova, unsigned long nr_pages) | ^ | static 4 warnings generated.

vim +/dma_alloc_iova +252 drivers/iommu/hisilicon/ummu-core/core_iova.c 251

252 struct iova_slot *dma_alloc_iova(struct device *dev, size_t size, 253 unsigned long attrs, dma_addr_t *iovap, 254 size_t *sizep) 255 { 256 struct iommu_domain *domain; 257 struct iova_slot *slot; 258 dma_addr_t iova; 259 int ret; 260 261 size = PAGE_ALIGN(size); 262 domain = iommu_get_domain_for_dev(dev); 263 if (!domain || !iommu_is_dma_domain(domain)) { 264 ret = -ENODEV; 265 goto err_out; 266 } 267 iova = domain_alloc_iova(domain, size, dev->coherent_dma_mask, dev); 268 if (!iova) { 269 ret = -EFAULT; 270 goto err_out; 271 } 272 273 slot = alloc_iova_slot(dev, iova, size, attrs); 274 if (!slot) { 275 ret = -ENOMEM; 276 goto err_free_iova; 277 } 278 279 *iovap = iova; 280 *sizep = size; 281 return slot; 282 283 err_free_iova: 284 domain_free_iova(domain, iova, size); 285 err_out: 286 return ERR_PTR(ret); 287 } 288 EXPORT_SYMBOL_GPL(dma_alloc_iova); 289 290 void dma_free_iova(struct iova_slot *slot) 291 { 292 drain_pages(slot, slot->iova, slot->nr_pages); 293 domain_free_iova(slot->domain, slot->iova, slot->nr_pages << PAGE_SHIFT); 294 free_iova_slot(slot); 295 } 296 EXPORT_SYMBOL_GPL(dma_free_iova); 297 298 int ummu_fill_pages(struct iova_slot *slot, dma_addr_t iova, unsigned long nr_pages) 299 { 300 struct page **pages; 301 unsigned long i; 302 int ret; 303 304 if (!IS_ALIGNED(iova, PAGE_SIZE) || !nr_pages) 305 return -EINVAL; 306 307 if (!check_iova_range(slot, iova, nr_pages)) 308 return -EINVAL; 309 310 if (!check_iova_bitmap_region(slot, iova_bitmap_offset(slot, iova), nr_pages, true)) 311 return -EEXIST; 312 313 pages = allocate_pages(slot->dev, nr_pages, GFP_KERNEL | __GFP_ZERO); 314 if (!pages) 315 return -ENOMEM; 316 317 ret = map_pages(slot, iova, nr_pages, pages); 318 if (ret != 0) 319 goto err_free_pages; 320 321 bitmap_set(slot->bitmap, iova_bitmap_offset(slot, iova), nr_pages); 322 kvfree(pages); 323 return 0; 324 325 err_free_pages: 326 for (i = 0; i < nr_pages; i++) 327 __free_page(pages[i]); 328 kvfree(pages); 329 return ret; 330 } 331 EXPORT_SYMBOL_GPL(ummu_fill_pages); 332 333 int ummu_drain_pages(struct iova_slot *slot, dma_addr_t iova, unsigned long nr_pages)

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