[PATCH v2 08/11] swiotlb-xen: introduce phys_to_dma/dma_to_phys translations

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>

With some devices physical addresses are different than dma addresses.
To be able to deal with these cases, we need to call phys_to_dma on
physical addresses (including machine addresses in Xen terminology)
before returning them from xen_swiotlb_alloc_coherent and
xen_swiotlb_map_page.

We also need to convert dma addresses back to physical addresses using
dma_to_phys in xen_swiotlb_free_coherent and xen_swiotlb_unmap_page if
we want to do any operations on them.

Call dma_to_phys in is_xen_swiotlb_buffer.
Call phys_to_dma in xen_phys_to_bus.
Call dma_to_phys in xen_bus_to_phys.

Everything is taken care of by these changes except for
xen_swiotlb_alloc_coherent and xen_swiotlb_free_coherent, which need a
few explicit phys_to_dma/dma_to_phys calls.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
Tested-by: Corey Minyard <cminyard@xxxxxxxxxx>
Tested-by: Roman Shaposhnik <roman@xxxxxxxxxx>
---
Changes in v2:
- improve commit message
---
 drivers/xen/swiotlb-xen.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 0a6cb67f0fc4..60ef07440905 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -64,16 +64,16 @@ static inline dma_addr_t xen_phys_to_bus(struct device 
*dev, phys_addr_t paddr)
 
        dma |= paddr & ~XEN_PAGE_MASK;
 
-       return dma;
+       return phys_to_dma(dev, dma);
 }
 
-static inline phys_addr_t xen_bus_to_phys(struct device *dev, dma_addr_t baddr)
+static inline phys_addr_t xen_bus_to_phys(struct device *dev,
+                                         dma_addr_t dma_addr)
 {
+       phys_addr_t baddr = dma_to_phys(dev, dma_addr);
        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;
 }
@@ -99,7 +99,7 @@ static inline int range_straddles_page_boundary(phys_addr_t 
p, size_t size)
 
 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);
 
@@ -304,11 +304,11 @@ 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;
+       phys = dma_to_phys(hwdev, *dma_handle);
        dev_addr = xen_phys_to_bus(hwdev, phys);
        if (((dev_addr + size - 1 <= dma_mask)) &&
            !range_straddles_page_boundary(phys, size))
@@ -319,6 +319,7 @@ 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);
@@ -351,7 +352,8 @@ xen_swiotlb_free_coherent(struct device *hwdev, size_t 
size, void *vaddr,
            TestClearPageXenRemapped(pg))
                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);
 }
 
 /*
-- 
2.17.1