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authorToshi Kani <toshi.kani@hp.com>2015-04-15 01:47:20 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-15 02:49:04 +0300
commit0ddab1d2ed664c85c95488eef569786a84aedf37 (patch)
treeb7f2d24f5ba9e307052833500758e0d7bf10bf53 /include/linux/io.h
parent0f616be120c632c818faaea9adcb8f05a7a8601f (diff)
downloadlinux-0ddab1d2ed664c85c95488eef569786a84aedf37.tar.xz
lib/ioremap.c: add huge I/O map capability interfaces
Add ioremap_pud_enabled() and ioremap_pmd_enabled(), which return 1 when I/O mappings with pud/pmd are enabled on the kernel. ioremap_huge_init() calls arch_ioremap_pud_supported() and arch_ioremap_pmd_supported() to initialize the capabilities at boot-time. A new kernel option "nohugeiomap" is also added, so that user can disable the huge I/O map capabilities when necessary. Signed-off-by: Toshi Kani <toshi.kani@hp.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Robert Elliott <Elliott@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/io.h')
-rw-r--r--include/linux/io.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/io.h b/include/linux/io.h
index fa02e55e5a2e..4cc299c598e0 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -38,6 +38,14 @@ static inline int ioremap_page_range(unsigned long addr, unsigned long end,
}
#endif
+#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
+void __init ioremap_huge_init(void);
+int arch_ioremap_pud_supported(void);
+int arch_ioremap_pmd_supported(void);
+#else
+static inline void ioremap_huge_init(void) { }
+#endif
+
/*
* Managed iomap interface
*/