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authorBjorn Helgaas <bjorn.helgaas@hp.com>2006-03-26 01:37:06 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-26 08:56:54 -0800
commite9b0a0712148abe96ff717a2b9f8dab1d433e0d5 (patch)
tree3f4415797d49f477c9c7516625c74438f31673f8
parent[PATCH] EFI, /dev/mem: simplify efi_mem_attribute_range() (diff)
downloadlinux-dev-e9b0a0712148abe96ff717a2b9f8dab1d433e0d5.tar.xz
linux-dev-e9b0a0712148abe96ff717a2b9f8dab1d433e0d5.zip
[PATCH] ia64: ioremap: check EFI for valid memory attributes
Check the EFI memory map so we can use the correct memory attributes for ioremap(). Previously, we always used uncacheable access, which blows up on some machines for regular system memory. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Matt Domsch <Matt_Domsch@dell.com> Cc: "Tolentino, Matthew E" <matthew.e.tolentino@intel.com> Cc: "Brown, Len" <len.brown@intel.com> Cc: Andi Kleen <ak@muc.de> Acked-by: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/ia64/mm/Makefile2
-rw-r--r--arch/ia64/mm/ioremap.c43
-rw-r--r--include/asm-ia64/io.h15
3 files changed, 46 insertions, 14 deletions
diff --git a/arch/ia64/mm/Makefile b/arch/ia64/mm/Makefile
index d78d20f0a0f0..bb0a01a81878 100644
--- a/arch/ia64/mm/Makefile
+++ b/arch/ia64/mm/Makefile
@@ -2,7 +2,7 @@
# Makefile for the ia64-specific parts of the memory manager.
#
-obj-y := init.o fault.o tlb.o extable.o
+obj-y := init.o fault.o tlb.o extable.o ioremap.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_NUMA) += numa.o
diff --git a/arch/ia64/mm/ioremap.c b/arch/ia64/mm/ioremap.c
new file mode 100644
index 000000000000..62328621f99c
--- /dev/null
+++ b/arch/ia64/mm/ioremap.c
@@ -0,0 +1,43 @@
+/*
+ * (c) Copyright 2006 Hewlett-Packard Development Company, L.P.
+ * Bjorn Helgaas <bjorn.helgaas@hp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/compiler.h>
+#include <linux/module.h>
+#include <linux/efi.h>
+#include <asm/io.h>
+
+static inline void __iomem *
+__ioremap (unsigned long offset, unsigned long size)
+{
+ return (void __iomem *) (__IA64_UNCACHED_OFFSET | offset);
+}
+
+void __iomem *
+ioremap (unsigned long offset, unsigned long size)
+{
+ if (efi_mem_attribute_range(offset, size, EFI_MEMORY_UC))
+ return __ioremap(offset, size);
+
+ if (efi_mem_attribute_range(offset, size, EFI_MEMORY_WB))
+ return phys_to_virt(offset);
+
+ /*
+ * Someday this should check ACPI resources so we
+ * can do the right thing for hot-plugged regions.
+ */
+ return __ioremap(offset, size);
+}
+EXPORT_SYMBOL(ioremap);
+
+void __iomem *
+ioremap_nocache (unsigned long offset, unsigned long size)
+{
+ return __ioremap(offset, size);
+}
+EXPORT_SYMBOL(ioremap_nocache);
diff --git a/include/asm-ia64/io.h b/include/asm-ia64/io.h
index acba019b08e9..c2e3742108bb 100644
--- a/include/asm-ia64/io.h
+++ b/include/asm-ia64/io.h
@@ -416,25 +416,14 @@ __writeq (unsigned long val, volatile void __iomem *addr)
# define outl_p outl
#endif
-/*
- * An "address" in IO memory space is not clearly either an integer or a pointer. We will
- * accept both, thus the casts.
- *
- * On ia-64, we access the physical I/O memory space through the uncached kernel region.
- */
-static inline void __iomem *
-ioremap (unsigned long offset, unsigned long size)
-{
- return (void __iomem *) (__IA64_UNCACHED_OFFSET | (offset));
-}
+extern void __iomem * ioremap(unsigned long offset, unsigned long size);
+extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
static inline void
iounmap (volatile void __iomem *addr)
{
}
-#define ioremap_nocache(o,s) ioremap(o,s)
-
/* Use normal IO mappings for DMI */
#define dmi_ioremap ioremap
#define dmi_iounmap(x,l) iounmap(x)