diff options
Diffstat (limited to 'kernel/dma/direct.c')
| -rw-r--r-- | kernel/dma/direct.c | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 50f48e9e4598..9743c6ccce1a 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -265,28 +265,28 @@ void *dma_direct_alloc(struct device *dev, size_t size, page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO); if (!page) return NULL; + + /* + * dma_alloc_contiguous can return highmem pages depending on a + * combination the cma= arguments and per-arch setup. These need to be + * remapped to return a kernel virtual address. + */ if (PageHighMem(page)) { - /* - * Depending on the cma= arguments and per-arch setup, - * dma_alloc_contiguous could return highmem pages. - * Without remapping there is no way to return them here, so - * log an error and fail. - */ - if (!IS_ENABLED(CONFIG_DMA_REMAP)) { - dev_info(dev, "Rejecting highmem page from CMA.\n"); - goto out_free_pages; - } remap = true; set_uncached = false; } if (remap) { + pgprot_t prot = dma_pgprot(dev, PAGE_KERNEL, attrs); + + if (force_dma_unencrypted(dev)) + prot = pgprot_decrypted(prot); + /* remove any dirty cache lines on the kernel alias */ arch_dma_prep_coherent(page, size); /* create a coherent mapping */ - ret = dma_common_contiguous_remap(page, size, - dma_pgprot(dev, PAGE_KERNEL, attrs), + ret = dma_common_contiguous_remap(page, size, prot, __builtin_return_address(0)); if (!ret) goto out_free_pages; @@ -349,7 +349,7 @@ void dma_direct_free(struct device *dev, size_t size, dma_free_from_pool(dev, cpu_addr, PAGE_ALIGN(size))) return; - if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) { + if (is_vmalloc_addr(cpu_addr)) { vunmap(cpu_addr); } else { if (IS_ENABLED(CONFIG_ARCH_HAS_DMA_CLEAR_UNCACHED)) @@ -539,6 +539,8 @@ int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma, int ret = -ENXIO; vma->vm_page_prot = dma_pgprot(dev, vma->vm_page_prot, attrs); + if (force_dma_unencrypted(dev)) + vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret)) return ret; |