diff options
Diffstat (limited to 'drivers/iommu/iommu.c')
| -rw-r--r-- | drivers/iommu/iommu.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index ed8b04867b1f..46727ce9280d 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1124,6 +1124,31 @@ size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size) } EXPORT_SYMBOL_GPL(iommu_unmap); +size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova, + struct scatterlist *sg, unsigned int nents, int prot) +{ + int ret; + size_t mapped = 0; + unsigned int i; + struct scatterlist *s; + + for_each_sg(sg, s, nents, i) { + phys_addr_t phys = page_to_phys(sg_page(s)); + size_t page_len = s->offset + s->length; + + ret = iommu_map(domain, iova + mapped, phys, page_len, prot); + if (ret) { + /* undo mappings already done */ + iommu_unmap(domain, iova, mapped); + mapped = 0; + break; + } + mapped += page_len; + } + + return mapped; +} +EXPORT_SYMBOL_GPL(default_iommu_map_sg); int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, phys_addr_t paddr, u64 size, int prot) |