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Add WB/UC check for early_ioremap

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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>
This commit is contained in:
Li, Zhen-Hua 2013-03-18 10:45:43 +08:00 committed by Tony Luck
parent deb6001509
commit a4279e6202
1 changed files with 9 additions and 5 deletions
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14
arch/ia64/mm/ioremap.c
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@ -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 @@ __ioremap (unsigned long phys_addr)
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 @@ ioremap (unsigned long phys_addr, unsigned long size)
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 @@ ioremap (unsigned long phys_addr, unsigned long size)
return (void __iomem *) (offset + (char __iomem *)addr);
}
return __ioremap(phys_addr);
return __ioremap_uc(phys_addr);
}
EXPORT_SYMBOL(ioremap);
@ -103,7 +107,7 @@ ioremap_nocache (unsigned long phys_addr, unsigned long size)
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);