Add WB/UC check for early_ioremap
On ia64 system, the function early_ioremap returned an uncached memory
reference without checking whether this was consistent with existing
mappings. This causes efi error and the kernel failed during boot. Add a
check to test whether memory has EFI_MEMORY_WB set. Use the function
kern_mem_attribute() in early_iomap() function to provide appropriate
cacheable or uncacheable mapped address.
See the document Documentation/ia64/aliasing.txt for more details.
Signed-off-by: Li, Zhen-Hua <zhen-hual@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/mm/ioremap.c b/arch/ia64/mm/ioremap.c
index 3dccdd8..43964cd 100644
--- a/arch/ia64/mm/ioremap.c
+++ b/arch/ia64/mm/ioremap.c
@@ -16,7 +16,7 @@
#include <asm/meminit.h>
static inline void __iomem *
-__ioremap (unsigned long phys_addr)
+__ioremap_uc(unsigned long phys_addr)
{
return (void __iomem *) (__IA64_UNCACHED_OFFSET | phys_addr);
}
@@ -24,7 +24,11 @@
void __iomem *
early_ioremap (unsigned long phys_addr, unsigned long size)
{
- return __ioremap(phys_addr);
+ u64 attr;
+ attr = kern_mem_attribute(phys_addr, size);
+ if (attr & EFI_MEMORY_WB)
+ return (void __iomem *) phys_to_virt(phys_addr);
+ return __ioremap_uc(phys_addr);
}
void __iomem *
@@ -47,7 +51,7 @@
if (attr & EFI_MEMORY_WB)
return (void __iomem *) phys_to_virt(phys_addr);
else if (attr & EFI_MEMORY_UC)
- return __ioremap(phys_addr);
+ return __ioremap_uc(phys_addr);
/*
* Some chipsets don't support UC access to memory. If
@@ -93,7 +97,7 @@
return (void __iomem *) (offset + (char __iomem *)addr);
}
- return __ioremap(phys_addr);
+ return __ioremap_uc(phys_addr);
}
EXPORT_SYMBOL(ioremap);
@@ -103,7 +107,7 @@
if (kern_mem_attribute(phys_addr, size) & EFI_MEMORY_WB)
return NULL;
- return __ioremap(phys_addr);
+ return __ioremap_uc(phys_addr);
}
EXPORT_SYMBOL(ioremap_nocache);