1 files changed, 72 insertions, 47 deletions

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index b6d27762c6f8..39a0f2e0847c 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -52,37 +52,39 @@ static unsigned long xen_io_tlb_nslabs;
  * Quick lookup value of the bus address of the IOTLB.
  */
 
-static u64 start_dma_addr;
-
-/*
- * Both of these functions should avoid XEN_PFN_PHYS because phys_addr_t
- * can be 32bit when dma_addr_t is 64bit leading to a loss in
- * information if the shift is done before casting to 64bit.
- */
-static inline dma_addr_t xen_phys_to_bus(phys_addr_t paddr)
+static inline phys_addr_t xen_phys_to_bus(struct device *dev, phys_addr_t paddr)
 {
 	unsigned long bfn = pfn_to_bfn(XEN_PFN_DOWN(paddr));
-	dma_addr_t dma = (dma_addr_t)bfn << XEN_PAGE_SHIFT;
+	phys_addr_t baddr = (phys_addr_t)bfn << XEN_PAGE_SHIFT;
 
-	dma |= paddr & ~XEN_PAGE_MASK;
+	baddr |= paddr & ~XEN_PAGE_MASK;
+	return baddr;
+}
 
-	return dma;
+static inline dma_addr_t xen_phys_to_dma(struct device *dev, phys_addr_t paddr)
+{
+	return phys_to_dma(dev, xen_phys_to_bus(dev, paddr));
 }
 
-static inline phys_addr_t xen_bus_to_phys(dma_addr_t baddr)
+static inline phys_addr_t xen_bus_to_phys(struct device *dev,
+					  phys_addr_t baddr)
 {
 	unsigned long xen_pfn = bfn_to_pfn(XEN_PFN_DOWN(baddr));
-	dma_addr_t dma = (dma_addr_t)xen_pfn << XEN_PAGE_SHIFT;
-	phys_addr_t paddr = dma;
-
-	paddr |= baddr & ~XEN_PAGE_MASK;
+	phys_addr_t paddr = (xen_pfn << XEN_PAGE_SHIFT) |
+			    (baddr & ~XEN_PAGE_MASK);
 
 	return paddr;
 }
 
-static inline dma_addr_t xen_virt_to_bus(void *address)
+static inline phys_addr_t xen_dma_to_phys(struct device *dev,
+					  dma_addr_t dma_addr)
 {
-	return xen_phys_to_bus(virt_to_phys(address));
+	return xen_bus_to_phys(dev, dma_to_phys(dev, dma_addr));
+}
+
+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 int range_straddles_page_boundary(phys_addr_t p, size_t size)
@@ -99,11 +101,11 @@ static inline int range_straddles_page_boundary(phys_addr_t p, size_t size)
 	return 0;
 }
 
-static int is_xen_swiotlb_buffer(dma_addr_t dma_addr)
+static int is_xen_swiotlb_buffer(struct device *dev, dma_addr_t dma_addr)
 {
-	unsigned long bfn = XEN_PFN_DOWN(dma_addr);
+	unsigned long bfn = XEN_PFN_DOWN(dma_to_phys(dev, dma_addr));
 	unsigned long xen_pfn = bfn_to_local_pfn(bfn);
-	phys_addr_t paddr = XEN_PFN_PHYS(xen_pfn);
+	phys_addr_t paddr = (phys_addr_t)xen_pfn << XEN_PAGE_SHIFT;
 
 	/* If the address is outside our domain, it CAN
 	 * have the same virtual address as another address
@@ -241,7 +243,6 @@ retry:
 		m_ret = XEN_SWIOTLB_EFIXUP;
 		goto error;
 	}
-	start_dma_addr = xen_virt_to_bus(xen_io_tlb_start);
 	if (early) {
 		if (swiotlb_init_with_tbl(xen_io_tlb_start, xen_io_tlb_nslabs,
 			 verbose))
@@ -307,12 +308,12 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 	if (hwdev && hwdev->coherent_dma_mask)
 		dma_mask = hwdev->coherent_dma_mask;
 
-	/* At this point dma_handle is the physical address, next we are
+	/* At this point dma_handle is the dma address, next we are
 	 * going to set it to the machine address.
 	 * Do not use virt_to_phys(ret) because on ARM it doesn't correspond
 	 * to *dma_handle. */
-	phys = *dma_handle;
-	dev_addr = xen_phys_to_bus(phys);
+	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))
 		*dma_handle = dev_addr;
@@ -322,6 +323,7 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
 			xen_free_coherent_pages(hwdev, size, ret, (dma_addr_t)phys, attrs);
 			return NULL;
 		}
+		*dma_handle = phys_to_dma(hwdev, *dma_handle);
 		SetPageXenRemapped(virt_to_page(ret));
 	}
 	memset(ret, 0, size);
@@ -335,23 +337,30 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
 	int order = get_order(size);
 	phys_addr_t phys;
 	u64 dma_mask = DMA_BIT_MASK(32);
+	struct page *page;
 
 	if (hwdev && hwdev->coherent_dma_mask)
 		dma_mask = hwdev->coherent_dma_mask;
 
 	/* do not use virt_to_phys because on ARM it doesn't return you the
 	 * physical address */
-	phys = xen_bus_to_phys(dev_addr);
+	phys = xen_dma_to_phys(hwdev, dev_addr);
 
 	/* Convert the size to actually allocated. */
 	size = 1UL << (order + XEN_PAGE_SHIFT);
 
+	if (is_vmalloc_addr(vaddr))
+		page = vmalloc_to_page(vaddr);
+	else
+		page = virt_to_page(vaddr);
+
 	if (!WARN_ON((dev_addr + size - 1 > dma_mask) ||
 		     range_straddles_page_boundary(phys, size)) &&
-	    TestClearPageXenRemapped(virt_to_page(vaddr)))
+	    TestClearPageXenRemapped(page))
 		xen_destroy_contiguous_region(phys, order);
 
-	xen_free_coherent_pages(hwdev, size, vaddr, (dma_addr_t)phys, attrs);
+	xen_free_coherent_pages(hwdev, size, vaddr, phys_to_dma(hwdev, phys),
+				attrs);
 }
 
 /*
@@ -367,7 +376,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
 				unsigned long attrs)
 {
 	phys_addr_t map, phys = page_to_phys(page) + offset;
-	dma_addr_t dev_addr = xen_phys_to_bus(phys);
+	dma_addr_t dev_addr = xen_phys_to_dma(dev, phys);
 
 	BUG_ON(dir == DMA_NONE);
 	/*
@@ -386,13 +395,13 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
 	 */
 	trace_swiotlb_bounced(dev, dev_addr, size, swiotlb_force);
 
-	map = swiotlb_tbl_map_single(dev, start_dma_addr, phys,
-				     size, size, dir, attrs);
+	map = swiotlb_tbl_map_single(dev, virt_to_phys(xen_io_tlb_start),
+				     phys, size, size, dir, attrs);
 	if (map == (phys_addr_t)DMA_MAPPING_ERROR)
 		return DMA_MAPPING_ERROR;
 
 	phys = map;
-	dev_addr = xen_phys_to_bus(map);
+	dev_addr = xen_phys_to_dma(dev, map);
 
 	/*
 	 * Ensure that the address returned is DMA'ble
@@ -404,8 +413,12 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
 	}
 
 done:
-	if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
-		xen_dma_sync_for_device(dev_addr, phys, size, dir);
+	if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
+		if (pfn_valid(PFN_DOWN(dma_to_phys(dev, dev_addr))))
+			arch_sync_dma_for_device(phys, size, dir);
+		else
+			xen_dma_sync_for_device(dev, dev_addr, size, dir);
+	}
 	return dev_addr;
 }
 
@@ -420,15 +433,19 @@ done:
 static void xen_swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
 		size_t size, enum dma_data_direction dir, unsigned long attrs)
 {
-	phys_addr_t paddr = xen_bus_to_phys(dev_addr);
+	phys_addr_t paddr = xen_dma_to_phys(hwdev, dev_addr);
 
 	BUG_ON(dir == DMA_NONE);
 
-	if (!dev_is_dma_coherent(hwdev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
-		xen_dma_sync_for_cpu(dev_addr, paddr, size, dir);
+	if (!dev_is_dma_coherent(hwdev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
+		if (pfn_valid(PFN_DOWN(dma_to_phys(hwdev, dev_addr))))
+			arch_sync_dma_for_cpu(paddr, size, dir);
+		else
+			xen_dma_sync_for_cpu(hwdev, dev_addr, size, dir);
+	}
 
 	/* NOTE: We use dev_addr here, not paddr! */
-	if (is_xen_swiotlb_buffer(dev_addr))
+	if (is_xen_swiotlb_buffer(hwdev, dev_addr))
 		swiotlb_tbl_unmap_single(hwdev, paddr, size, size, dir, attrs);
 }
 
@@ -436,12 +453,16 @@ static void
 xen_swiotlb_sync_single_for_cpu(struct device *dev, dma_addr_t dma_addr,
 		size_t size, enum dma_data_direction dir)
 {
-	phys_addr_t paddr = xen_bus_to_phys(dma_addr);
+	phys_addr_t paddr = xen_dma_to_phys(dev, dma_addr);
 
-	if (!dev_is_dma_coherent(dev))
-		xen_dma_sync_for_cpu(dma_addr, paddr, size, dir);
+	if (!dev_is_dma_coherent(dev)) {
+		if (pfn_valid(PFN_DOWN(dma_to_phys(dev, dma_addr))))
+			arch_sync_dma_for_cpu(paddr, size, dir);
+		else
+			xen_dma_sync_for_cpu(dev, dma_addr, size, dir);
+	}
 
-	if (is_xen_swiotlb_buffer(dma_addr))
+	if (is_xen_swiotlb_buffer(dev, dma_addr))
 		swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_CPU);
 }
 
@@ -449,13 +470,17 @@ static void
 xen_swiotlb_sync_single_for_device(struct device *dev, dma_addr_t dma_addr,
 		size_t size, enum dma_data_direction dir)
 {
-	phys_addr_t paddr = xen_bus_to_phys(dma_addr);
+	phys_addr_t paddr = xen_dma_to_phys(dev, dma_addr);
 
-	if (is_xen_swiotlb_buffer(dma_addr))
+	if (is_xen_swiotlb_buffer(dev, dma_addr))
 		swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_DEVICE);
 
-	if (!dev_is_dma_coherent(dev))
-		xen_dma_sync_for_device(dma_addr, paddr, size, dir);
+	if (!dev_is_dma_coherent(dev)) {
+		if (pfn_valid(PFN_DOWN(dma_to_phys(dev, dma_addr))))
+			arch_sync_dma_for_device(paddr, size, dir);
+		else
+			xen_dma_sync_for_device(dev, dma_addr, size, dir);
+	}
 }
 
 /*
@@ -536,7 +561,7 @@ xen_swiotlb_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
 static int
 xen_swiotlb_dma_supported(struct device *hwdev, u64 mask)
 {
-	return xen_virt_to_bus(xen_io_tlb_end - 1) <= mask;
+	return xen_virt_to_bus(hwdev, xen_io_tlb_end - 1) <= mask;
 }
 
 const struct dma_map_ops xen_swiotlb_dma_ops = {