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This makes the DMA API use shared memory for coherent allocations and bounce streaming mappings through SWIOTLB. A device marked with DEV_FLAG_DMA_CC_PRIVATE can reach private memory directly. Add dma_require_decrypted() to combine force_dma_unencrypted() with the new device flag, and use it throughout the generic DMA code. Signed-off-by: Nicolin Chen --- include/linux/dma-direct.h | 7 ++++++- kernel/dma/direct.c | 16 ++++++++-------- kernel/dma/mapping.c | 2 +- kernel/dma/swiotlb.c | 2 +- 4 files changed, 16 insertions(+), 11 deletions(-) diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h index daa31a1adf7b0..fb35ca27941cc 100644 --- a/include/linux/dma-direct.h +++ b/include/linux/dma-direct.h @@ -134,6 +134,11 @@ static inline bool force_dma_unencrypted(struct device *dev) } #endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */ +static inline bool dma_require_decrypted(struct device *dev) +{ + return !dev_dma_cc_private(dev) && force_dma_unencrypted(dev); +} + static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size, bool is_ram, unsigned long attrs) { @@ -146,7 +151,7 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size, * requires unencrypted DMA addresses. Treat it as not DMA-capable * so the caller can fall back to a suitable SWIOTLB pool. */ - if (!(attrs & DMA_ATTR_CC_SHARED) && force_dma_unencrypted(dev)) + if (!(attrs & DMA_ATTR_CC_SHARED) && dma_require_decrypted(dev)) return false; if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) && diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 25e9a86835fd3..b3b9ff090c590 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -41,7 +41,7 @@ static inline struct page *dma_direct_to_page(struct device *dev, u64 dma_direct_get_required_mask(struct device *dev) { - bool require_decrypted = force_dma_unencrypted(dev); + bool require_decrypted = dma_require_decrypted(dev); phys_addr_t phys = ((phys_addr_t)max_pfn << PAGE_SHIFT) - 1; u64 max_dma = phys_to_dma_direct(dev, phys, require_decrypted); @@ -72,7 +72,7 @@ static gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 *phys_limit) bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size) { - bool require_decrypted = force_dma_unencrypted(dev); + bool require_decrypted = dma_require_decrypted(dev); dma_addr_t dma_addr = phys_to_dma_direct(dev, phys, require_decrypted); if (dma_addr == DMA_MAPPING_ERROR) @@ -226,7 +226,7 @@ void *dma_direct_alloc(struct device *dev, size_t size, struct page *page; void *cpu_addr; - if (force_dma_unencrypted(dev)) + if (dma_require_decrypted(dev)) attrs |= __DMA_ATTR_ALLOC_CC_SHARED; if (attrs & __DMA_ATTR_ALLOC_CC_SHARED) { @@ -385,7 +385,7 @@ void dma_direct_free(struct device *dev, size_t size, * If the allocation used decrypted/shared backing pages, restore * the encryption state on free. */ - if (force_dma_unencrypted(dev)) + if (dma_require_decrypted(dev)) attrs |= __DMA_ATTR_ALLOC_CC_SHARED; if (attrs & __DMA_ATTR_ALLOC_CC_SHARED) @@ -452,7 +452,7 @@ struct page *dma_direct_alloc_pages(struct device *dev, size_t size, struct page *page; void *cpu_addr; - if (force_dma_unencrypted(dev)) + if (dma_require_decrypted(dev)) attrs |= __DMA_ATTR_ALLOC_CC_SHARED; if ((attrs & __DMA_ATTR_ALLOC_CC_SHARED) && dma_direct_use_pool(dev, gfp)) @@ -496,7 +496,7 @@ void dma_direct_free_pages(struct device *dev, size_t size, * if the device had requested for an unencrypted buffer, * convert it to encrypted on free */ - bool mark_mem_encrypted = force_dma_unencrypted(dev); + bool mark_mem_encrypted = dma_require_decrypted(dev); /* If page is not from an atomic pool, dma_free_from_pool_page() fails */ if (IS_ENABLED(CONFIG_DMA_COHERENT_POOL) && @@ -665,7 +665,7 @@ int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma, const pgoff_t pgoff_end = vma_end_pgoff(vma); int ret = -ENXIO; - if (force_dma_unencrypted(dev)) + if (dma_require_decrypted(dev)) attrs |= DMA_ATTR_CC_SHARED; vma->vm_page_prot = dma_pgprot(dev, vma->vm_page_prot, attrs); @@ -814,7 +814,7 @@ size_t dma_direct_max_mapping_size(struct device *dev) /* If SWIOTLB is active, use its maximum mapping size */ if (is_swiotlb_active(dev) && (dma_addressing_limited(dev) || is_swiotlb_force_bounce(dev) || - force_dma_unencrypted(dev))) + dma_require_decrypted(dev))) return swiotlb_max_mapping_size(dev); return SIZE_MAX; diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index ded585b39fb92..0252473edd0b5 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -673,7 +673,7 @@ void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, return NULL; } - if (force_dma_unencrypted(dev)) + if (dma_require_decrypted(dev)) attrs |= __DMA_ATTR_ALLOC_CC_SHARED; if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr)) { diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 2c57b49ac7c06..ddfc4533934a2 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -1550,7 +1550,7 @@ phys_addr_t swiotlb_tbl_map_single(struct device *dev, phys_addr_t orig_addr, if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) { /* swiotlb pool is incorrect for this device */ - if (unlikely(mem->cc_shared != force_dma_unencrypted(dev))) + if (unlikely(mem->cc_shared != dma_require_decrypted(dev))) return (phys_addr_t)DMA_MAPPING_ERROR; } else if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT)) { -- 2.43.0