The patch titled
Subject: x86, mm: support huge I/O mapping capability I/F
has been added to the -mm tree. Its filename is
x86-mm-support-huge-i-o-mapping-capability-i-f.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/x86-mm-support-huge-i-o-mapping-capability-i-f.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/x86-mm-support-huge-i-o-mapping-capability-i-f.patch
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------------------------------------------------------
From: Toshi Kani <toshi.kani@xxxxxx>
Subject: x86, mm: support huge I/O mapping capability I/F
Implement huge I/O mapping capability interfaces for ioremap() on x86.
IOREMAP_MAX_ORDER is defined to PUD_SHIFT on x86/64 and PMD_SHIFT on
x86/32, which overrides the default value defined in <linux/vmalloc.h>.
Signed-off-by: Toshi Kani <toshi.kani@xxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Robert Elliott <Elliott@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/page_types.h | 2 ++
arch/x86/mm/ioremap.c | 23 +++++++++++++++++++++--
2 files changed, 23 insertions(+), 2 deletions(-)
diff -puN arch/x86/include/asm/page_types.h~x86-mm-support-huge-i-o-mapping-capability-i-f arch/x86/include/asm/page_types.h
--- a/arch/x86/include/asm/page_types.h~x86-mm-support-huge-i-o-mapping-capability-i-f
+++ a/arch/x86/include/asm/page_types.h
@@ -40,8 +40,10 @@
#ifdef CONFIG_X86_64
#include <asm/page_64_types.h>
+#define IOREMAP_MAX_ORDER (PUD_SHIFT)
#else
#include <asm/page_32_types.h>
+#define IOREMAP_MAX_ORDER (PMD_SHIFT)
#endif /* CONFIG_X86_64 */
#ifndef __ASSEMBLY__
diff -puN arch/x86/mm/ioremap.c~x86-mm-support-huge-i-o-mapping-capability-i-f arch/x86/mm/ioremap.c
--- a/arch/x86/mm/ioremap.c~x86-mm-support-huge-i-o-mapping-capability-i-f
+++ a/arch/x86/mm/ioremap.c
@@ -67,8 +67,13 @@ static int __ioremap_check_ram(unsigned
/*
* Remap an arbitrary physical address space into the kernel virtual
- * address space. Needed when the kernel wants to access high addresses
- * directly.
+ * address space. It transparently creates kernel huge I/O mapping when
+ * the physical address is aligned by a huge page size (1GB or 2MB) and
+ * the requested size is at least the huge page size.
+ *
+ * NOTE: MTRRs can override PAT memory types with a 4KB granularity.
+ * Therefore, the mapping code falls back to use a smaller page toward 4KB
+ * when a mapping range is covered by non-WB type of MTRRs.
*
* NOTE! We need to allow non-page-aligned mappings too: we will obviously
* have to convert them into an offset in a page-aligned mapping, but the
@@ -326,6 +331,20 @@ void iounmap(volatile void __iomem *addr
}
EXPORT_SYMBOL(iounmap);
+int arch_ioremap_pud_supported(void)
+{
+#ifdef CONFIG_X86_64
+ return cpu_has_gbpages;
+#else
+ return 0;
+#endif
+}
+
+int arch_ioremap_pmd_supported(void)
+{
+ return cpu_has_pse;
+}
+
/*
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
_
Patches currently in -mm which might be from toshi.kani@xxxxxx are
mm-change-__get_vm_area_node-to-use-fls_long.patch
lib-add-huge-i-o-map-capability-interfaces.patch
mm-change-ioremap-to-set-up-huge-i-o-mappings.patch
mm-change-vunmap-to-tear-down-huge-kva-mappings.patch
x86-mm-support-huge-i-o-mapping-capability-i-f.patch
x86-mm-support-huge-kva-mappings-on-x86.patch
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