[Xen-devel] [PATCH v5 21/22] xen/swiotlb: Pass addresses rather than frame numbers to xen_arch_need_swiotlb

[Julien Grall <julien.grall@xxxxxxxxxx>]

With 64KB page granularity support, the frame number will be different.

It will be easier to modify the behavior in a single place rather than
in each caller.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

---
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: David Vrabel <david.vrabel@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: x86@xxxxxxxxxx

    Changes in v5:
        - Patch was previously sent separately
        - Fix compilation on x86 (spurious ; at the end of the
        declaration)
        - Add Stefano's reviewed-by
---
 arch/arm/include/asm/xen/page.h | 4 ++--
 arch/arm/xen/mm.c               | 7 +++++--
 arch/x86/include/asm/xen/page.h | 4 ++--
 drivers/xen/swiotlb-xen.c       | 4 ++--
 4 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
index e3d94cf..415dbc6 100644
--- a/arch/arm/include/asm/xen/page.h
+++ b/arch/arm/include/asm/xen/page.h
@@ -115,8 +115,8 @@ static inline bool set_phys_to_machine(unsigned long pfn, 
unsigned long mfn)
 #define xen_unmap(cookie) iounmap((cookie))
 
 bool xen_arch_need_swiotlb(struct device *dev,
-                          unsigned long pfn,
-                          unsigned long bfn);
+                          phys_addr_t phys,
+                          dma_addr_t dev_addr);
 unsigned long xen_get_swiotlb_free_pages(unsigned int order);
 
 #endif /* _ASM_ARM_XEN_PAGE_H */
diff --git a/arch/arm/xen/mm.c b/arch/arm/xen/mm.c
index 6dd911d..7b517e91 100644
--- a/arch/arm/xen/mm.c
+++ b/arch/arm/xen/mm.c
@@ -138,9 +138,12 @@ void __xen_dma_sync_single_for_device(struct device *hwdev,
 }
 
 bool xen_arch_need_swiotlb(struct device *dev,
-                          unsigned long pfn,
-                          unsigned long bfn)
+                          phys_addr_t phys,
+                          dma_addr_t dev_addr)
 {
+       unsigned long pfn = PFN_DOWN(phys);
+       unsigned long bfn = PFN_DOWN(dev_addr);
+
        return (!hypercall_cflush && (pfn != bfn) && 
!is_device_dma_coherent(dev));
 }
 
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index fe58e3a..f5fb840 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -298,8 +298,8 @@ void make_lowmem_page_readwrite(void *vaddr);
 #define xen_unmap(cookie) iounmap((cookie))
 
 static inline bool xen_arch_need_swiotlb(struct device *dev,
-                                        unsigned long pfn,
-                                        unsigned long bfn)
+                                        phys_addr_t phys,
+                                        dma_addr_t dev_addr)
 {
        return false;
 }
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 79bc493..0a5a0e9 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -392,7 +392,7 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct 
page *page,
         */
        if (dma_capable(dev, dev_addr, size) &&
            !range_straddles_page_boundary(phys, size) &&
-               !xen_arch_need_swiotlb(dev, PFN_DOWN(phys), PFN_DOWN(dev_addr)) 
&&
+               !xen_arch_need_swiotlb(dev, phys, dev_addr) &&
                !swiotlb_force) {
                /* we are not interested in the dma_addr returned by
                 * xen_dma_map_page, only in the potential cache flushes 
executed
@@ -551,7 +551,7 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct 
scatterlist *sgl,
                dma_addr_t dev_addr = xen_phys_to_bus(paddr);
 
                if (swiotlb_force ||
-                   xen_arch_need_swiotlb(hwdev, PFN_DOWN(paddr), 
PFN_DOWN(dev_addr)) ||
+                   xen_arch_need_swiotlb(hwdev, paddr, dev_addr) ||
                    !dma_capable(hwdev, dev_addr, sg->length) ||
                    range_straddles_page_boundary(paddr, sg->length)) {
                        phys_addr_t map = swiotlb_tbl_map_single(hwdev,
-- 
2.1.4


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