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Subject[patch 06/13] x86: PAT use reserve free memtype in set_memory_uc
Use reserve_memtype and free_memtype interfaces in set_memory_uc/set_memory_wb
interfaces to avoid aliasing.
Usage model of set_memory_uc and set_memory_wb is for RAM memory and users
will first call set_memory_uc and call set_memory_wb after use to reset the
attribute.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>

Index: linux-2.6-x86.git/arch/x86/mm/pageattr.c
===================================================================
--- linux-2.6-x86.git.orig/arch/x86/mm/pageattr.c 2008-03-18 02:16:06.000000000 -0700
+++ linux-2.6-x86.git/arch/x86/mm/pageattr.c 2008-03-18 09:20:30.000000000 -0700
@@ -19,6 +19,7 @@
#include <asm/uaccess.h>
#include <asm/pgalloc.h>
#include <asm/proto.h>
+#include <asm/pat.h>

/*
* The current flushing context - we pass it instead of 5 arguments:
@@ -771,18 +772,34 @@
return change_page_attr_set_clr(addr, numpages, __pgprot(0), mask);
}

-int set_memory_uc(unsigned long addr, int numpages)
+int _set_memory_uc(unsigned long addr, int numpages)
{
return change_page_attr_set(addr, numpages,
__pgprot(_PAGE_CACHE_UC));
}
+
+int set_memory_uc(unsigned long addr, int numpages)
+{
+ if (reserve_memtype(addr, addr + numpages * PAGE_SIZE,
+ _PAGE_CACHE_UC, NULL))
+ return -EINVAL;
+
+ return _set_memory_uc(addr, numpages);
+}
EXPORT_SYMBOL(set_memory_uc);

-int set_memory_wb(unsigned long addr, int numpages)
+int _set_memory_wb(unsigned long addr, int numpages)
{
return change_page_attr_clear(addr, numpages,
__pgprot(_PAGE_CACHE_MASK));
}
+
+int set_memory_wb(unsigned long addr, int numpages)
+{
+ free_memtype(addr, addr + numpages * PAGE_SIZE);
+
+ return _set_memory_wb(addr, numpages);
+}
EXPORT_SYMBOL(set_memory_wb);

int set_memory_x(unsigned long addr, int numpages)
Index: linux-2.6-x86.git/arch/x86/mm/ioremap.c
===================================================================
--- linux-2.6-x86.git.orig/arch/x86/mm/ioremap.c 2008-03-18 03:19:44.000000000 -0700
+++ linux-2.6-x86.git/arch/x86/mm/ioremap.c 2008-03-18 09:20:25.000000000 -0700
@@ -96,10 +96,10 @@
switch (prot_val) {
case _PAGE_CACHE_UC:
default:
- err = set_memory_uc(vaddr, nrpages);
+ err = _set_memory_uc(vaddr, nrpages);
break;
case _PAGE_CACHE_WB:
- err = set_memory_wb(vaddr, nrpages);
+ err = _set_memory_wb(vaddr, nrpages);
break;
}

Index: linux-2.6-x86.git/include/asm-x86/cacheflush.h
===================================================================
--- linux-2.6-x86.git.orig/include/asm-x86/cacheflush.h 2008-03-18 02:16:06.000000000 -0700
+++ linux-2.6-x86.git/include/asm-x86/cacheflush.h 2008-03-18 09:20:30.000000000 -0700
@@ -34,6 +34,8 @@
int set_pages_ro(struct page *page, int numpages);
int set_pages_rw(struct page *page, int numpages);

+int _set_memory_uc(unsigned long addr, int numpages);
+int _set_memory_wb(unsigned long addr, int numpages);
int set_memory_uc(unsigned long addr, int numpages);
int set_memory_wb(unsigned long addr, int numpages);
int set_memory_x(unsigned long addr, int numpages);
--


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