[RFC PATCH 06/14] fixmap: Allow architecture overriding set_fixmap_io

[Steven Price]

From: Suzuki K Poulose <suzuki.poulose@xxxxxxx>

For a realm guest it will be necessary to ensure IO mappings are shared
so that the VMM can emulate the device. The following patch will provide
an implementation of set_fixmap_io for arm64 setting the shared bit (if
in a realm).

Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Signed-off-by: Steven Price <steven.price@xxxxxxx>
---
 include/asm-generic/fixmap.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/asm-generic/fixmap.h b/include/asm-generic/fixmap.h
index 8cc7b09c1bc7..c5ce0368c1ee 100644
--- a/include/asm-generic/fixmap.h
+++ b/include/asm-generic/fixmap.h
@@ -94,8 +94,10 @@ static inline unsigned long virt_to_fix(const unsigned long vaddr)
 /*
  * Some fixmaps are for IO
  */
+#ifndef set_fixmap_io
 #define set_fixmap_io(idx, phys) \
 	__set_fixmap(idx, phys, FIXMAP_PAGE_IO)
+#endif
 
 #define set_fixmap_offset_io(idx, phys) \
 	__set_fixmap_offset(idx, phys, FIXMAP_PAGE_IO)
-- 
2.34.1