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xen/arm: remove mach_to_phys rbtree

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Remove the rbtree used to keep track of machine to physical mappings:
the frontend can grant the same page multiple times, leading to errors
inserting or removing entries from the mach_to_phys tree.

Linux only needed to know the physical address corresponding to a given
machine address in swiotlb-xen. Now that swiotlb-xen can call the
xen_dma_* functions passing the machine address directly, we can remove
it.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Tested-by: Denis Schneider <v1ne2go@gmail.com>
This commit is contained in:
Stefano Stabellini
2014-09-10 22:49:48 +00:00
parent 340720be32
commit d50582e06f
2 changed files with 1 additions and 74 deletions
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9
arch/arm/include/asm/xen/page.h
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@@ -33,7 +33,6 @@ typedef struct xpaddr {
#define INVALID_P2M_ENTRY (~0UL)
unsigned long __pfn_to_mfn(unsigned long pfn);
unsigned long __mfn_to_pfn(unsigned long mfn);
extern struct rb_root phys_to_mach;
static inline unsigned long pfn_to_mfn(unsigned long pfn)
@@ -51,14 +50,6 @@ static inline unsigned long pfn_to_mfn(unsigned long pfn)
static inline unsigned long mfn_to_pfn(unsigned long mfn)
{
unsigned long pfn;
if (phys_to_mach.rb_node != NULL) {
pfn = __mfn_to_pfn(mfn);
if (pfn != INVALID_P2M_ENTRY)
return pfn;
}
return mfn;
}