arm/xen: implement correctly pfn_to_mfn

[firefly-linux-kernel-4.4.55.git] / arch / arm / include / asm / xen / page.h

diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
index 1bee8ca124945cdde1226e3cbff5503b9132c526..911d62b4df26eea29c1a57d417ffda3cc434205c 100644 (file)
--- a/arch/arm/include/asm/xen/page.h
+++ b/arch/arm/include/asm/xen/page.h
@@ -35,6 +35,17 @@ unsigned long __pfn_to_mfn(unsigned long pfn);
 extern struct rb_root phys_to_mach;
 
 static inline unsigned long pfn_to_mfn(unsigned long pfn)
+{
+       return pfn;
+}
+
+static inline unsigned long mfn_to_pfn(unsigned long mfn)
+{
+       return mfn;
+}
+
+/* Pseudo-physical <-> BUS conversion */
+static inline unsigned long pfn_to_bfn(unsigned long pfn)
 {
        unsigned long mfn;
 
@@ -47,33 +58,21 @@ static inline unsigned long pfn_to_mfn(unsigned long pfn)
        return pfn;
 }
 
-static inline unsigned long mfn_to_pfn(unsigned long mfn)
+static inline unsigned long bfn_to_pfn(unsigned long bfn)
 {
-       return mfn;
+       return bfn;
 }
 
-#define mfn_to_local_pfn(mfn) mfn_to_pfn(mfn)
-
-static inline xmaddr_t phys_to_machine(xpaddr_t phys)
-{
-       unsigned offset = phys.paddr & ~PAGE_MASK;
-       return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
-}
+#define bfn_to_local_pfn(bfn)  bfn_to_pfn(bfn)
 
-static inline xpaddr_t machine_to_phys(xmaddr_t machine)
-{
-       unsigned offset = machine.maddr & ~PAGE_MASK;
-       return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
-}
 /* VIRT <-> MACHINE conversion */
-#define virt_to_machine(v)     (phys_to_machine(XPADDR(__pa(v))))
 #define virt_to_mfn(v)         (pfn_to_mfn(virt_to_pfn(v)))
 #define mfn_to_virt(m)         (__va(mfn_to_pfn(m) << PAGE_SHIFT))
 
+/* Only used in PV code. But ARM guests are always HVM. */
 static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
 {
-       /* TODO: assuming it is mapped in the kernel 1:1 */
-       return virt_to_machine(vaddr);
+       BUG();
 }
 
 /* TODO: this shouldn't be here but it is because the frontend drivers
@@ -108,7 +107,7 @@ static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
 
 bool xen_arch_need_swiotlb(struct device *dev,
                           unsigned long pfn,
-                          unsigned long mfn);
+                          unsigned long bfn);
 unsigned long xen_get_swiotlb_free_pages(unsigned int order);
 
 #endif /* _ASM_ARM_XEN_PAGE_H */