[ Upstream commit 85fcb57c983f423180ba6ec5d0034242da05cc54 ]
When mapping a buffer for DMA via .map_page or .map_sg DMA operations, there is no need to check the machine frames to be aligned according to the mapped areas size. All what is needed in these cases is that the buffer is contiguous at machine level.
So carve out the alignment check from range_straddles_page_boundary() and move it to a helper called by xen_swiotlb_alloc_coherent() and xen_swiotlb_free_coherent() directly.
Fixes: 9f40ec84a797 ("xen/swiotlb: add alignment check for dma buffers")
Signed-off-by: Juergen Gross jgross@suse.com Signed-off-by: Harshvardhan Jha harshvardhan.j.jha@oracle.com --- drivers/xen/swiotlb-xen.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index 000d02ea4f7d8..d8efb8ea23a0d 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -87,19 +87,21 @@ static inline dma_addr_t xen_virt_to_bus(struct device *dev, void *address) return xen_phys_to_dma(dev, virt_to_phys(address)); }
+static inline bool range_requires_alignment(phys_addr_t p, size_t size) +{ + phys_addr_t algn = 1ULL << (get_order(size) + PAGE_SHIFT); + phys_addr_t bus_addr = pfn_to_bfn(XEN_PFN_DOWN(p)) << XEN_PAGE_SHIFT; + + return IS_ALIGNED(p, algn) && !IS_ALIGNED(bus_addr, algn); +} + static inline int range_straddles_page_boundary(phys_addr_t p, size_t size) { unsigned long next_bfn, xen_pfn = XEN_PFN_DOWN(p); unsigned int i, nr_pages = XEN_PFN_UP(xen_offset_in_page(p) + size); - phys_addr_t algn = 1ULL << (get_order(size) + PAGE_SHIFT);
next_bfn = pfn_to_bfn(xen_pfn);
- /* If buffer is physically aligned, ensure DMA alignment. */ - if (IS_ALIGNED(p, algn) && - !IS_ALIGNED((phys_addr_t)next_bfn << XEN_PAGE_SHIFT, algn)) - return 1; - for (i = 1; i < nr_pages; i++) if (pfn_to_bfn(++xen_pfn) != ++next_bfn) return 1; @@ -321,7 +323,8 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size, phys = dma_to_phys(hwdev, *dma_handle); dev_addr = xen_phys_to_dma(hwdev, phys); if (((dev_addr + size - 1 <= dma_mask)) && - !range_straddles_page_boundary(phys, size)) + !range_straddles_page_boundary(phys, size) && + !range_requires_alignment(phys, size)) *dma_handle = dev_addr; else { if (xen_create_contiguous_region(phys, order, @@ -362,6 +365,7 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
if (!WARN_ON((dev_addr + size - 1 > dma_mask) || range_straddles_page_boundary(phys, size)) && + !range_requires_alignment(phys, size) && TestClearPageXenRemapped(page)) xen_destroy_contiguous_region(phys, order);