From: Toshi Kani <toshi.kani@hp.com> To: akpm@linux-foundation.org, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, arnd@arndb.de, linux-mm@kvack.org Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Toshi Kani <toshi.kani@hp.com> Subject: [RFC PATCH 6/7] x86, mm: Support huge I/O mappings on x86 Date: Mon, 26 Jan 2015 16:13:28 -0700 [thread overview] Message-ID: <1422314009-31667-7-git-send-email-toshi.kani@hp.com> (raw) In-Reply-To: <1422314009-31667-1-git-send-email-toshi.kani@hp.com> Implement huge I/O mapping capability interfaces on x86. Also define IOREMAP_MAX_ORDER to the size of PUD or PMD on x86. When IOREMAP_MAX_ORDER is not defined on x86, it will be defined to the default value in <linux/vmalloc.h>. Signed-off-by: Toshi Kani <toshi.kani@hp.com> --- arch/x86/include/asm/page_types.h | 8 ++++++++ arch/x86/mm/ioremap.c | 16 ++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/arch/x86/include/asm/page_types.h b/arch/x86/include/asm/page_types.h index f97fbe3..debbfff 100644 --- a/arch/x86/include/asm/page_types.h +++ b/arch/x86/include/asm/page_types.h @@ -38,6 +38,14 @@ #define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START) +#ifdef CONFIG_HUGE_IOMAP +#ifdef CONFIG_X86_64 +#define IOREMAP_MAX_ORDER (PUD_SHIFT) +#elif defined(PMD_SHIFT) +#define IOREMAP_MAX_ORDER (PMD_SHIFT) +#endif +#endif /* CONFIG_HUGE_IOMAP */ + #ifdef CONFIG_X86_64 #include <asm/page_64_types.h> #else diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index fdf617c..ef32bec 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -326,6 +326,22 @@ void iounmap(volatile void __iomem *addr) } EXPORT_SYMBOL(iounmap); +#ifdef CONFIG_HUGE_IOMAP +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; +} +#endif /* CONFIG_HUGE_IOMAP */ + /* * Convert a physical pointer to a virtual kernel pointer for /dev/mem * access
WARNING: multiple messages have this Message-ID (diff)
From: Toshi Kani <toshi.kani@hp.com> To: akpm@linux-foundation.org, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, arnd@arndb.de, linux-mm@kvack.org Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Toshi Kani <toshi.kani@hp.com> Subject: [RFC PATCH 6/7] x86, mm: Support huge I/O mappings on x86 Date: Mon, 26 Jan 2015 16:13:28 -0700 [thread overview] Message-ID: <1422314009-31667-7-git-send-email-toshi.kani@hp.com> (raw) In-Reply-To: <1422314009-31667-1-git-send-email-toshi.kani@hp.com> Implement huge I/O mapping capability interfaces on x86. Also define IOREMAP_MAX_ORDER to the size of PUD or PMD on x86. When IOREMAP_MAX_ORDER is not defined on x86, it will be defined to the default value in <linux/vmalloc.h>. Signed-off-by: Toshi Kani <toshi.kani@hp.com> --- arch/x86/include/asm/page_types.h | 8 ++++++++ arch/x86/mm/ioremap.c | 16 ++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/arch/x86/include/asm/page_types.h b/arch/x86/include/asm/page_types.h index f97fbe3..debbfff 100644 --- a/arch/x86/include/asm/page_types.h +++ b/arch/x86/include/asm/page_types.h @@ -38,6 +38,14 @@ #define __START_KERNEL (__START_KERNEL_map + __PHYSICAL_START) +#ifdef CONFIG_HUGE_IOMAP +#ifdef CONFIG_X86_64 +#define IOREMAP_MAX_ORDER (PUD_SHIFT) +#elif defined(PMD_SHIFT) +#define IOREMAP_MAX_ORDER (PMD_SHIFT) +#endif +#endif /* CONFIG_HUGE_IOMAP */ + #ifdef CONFIG_X86_64 #include <asm/page_64_types.h> #else diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index fdf617c..ef32bec 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -326,6 +326,22 @@ void iounmap(volatile void __iomem *addr) } EXPORT_SYMBOL(iounmap); +#ifdef CONFIG_HUGE_IOMAP +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; +} +#endif /* CONFIG_HUGE_IOMAP */ + /* * Convert a physical pointer to a virtual kernel pointer for /dev/mem * access -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2015-01-26 23:30 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-01-26 23:13 [RFC PATCH 0/7] Kernel huge I/O mapping support Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:13 ` [RFC PATCH 1/7] mm: Change __get_vm_area_node() to use fls_long() Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:13 ` [RFC PATCH 2/7] lib: Add huge I/O map capability interfaces Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:54 ` Andrew Morton 2015-01-26 23:54 ` Andrew Morton 2015-01-27 1:01 ` Toshi Kani 2015-01-27 1:01 ` Toshi Kani 2015-01-27 21:37 ` Andrew Morton 2015-01-27 21:37 ` Andrew Morton 2015-01-27 22:01 ` Toshi Kani 2015-01-27 22:01 ` Toshi Kani 2015-02-05 20:56 ` Toshi Kani 2015-02-05 20:56 ` Toshi Kani 2015-01-26 23:13 ` [RFC PATCH 3/7] mm: Change ioremap to set up huge I/O mappings Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:58 ` Andrew Morton 2015-01-26 23:58 ` Andrew Morton 2015-01-27 0:01 ` Toshi Kani 2015-01-27 0:01 ` Toshi Kani 2015-01-26 23:13 ` [RFC PATCH 4/7] mm: Change vunmap to tear down huge KVA mappings Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:13 ` [RFC PATCH 5/7] x86, mm: Support huge KVA mappings on x86 Toshi Kani 2015-01-26 23:13 ` Toshi Kani 2015-01-26 23:13 ` Toshi Kani [this message] 2015-01-26 23:13 ` [RFC PATCH 6/7] x86, mm: Support huge I/O " Toshi Kani 2015-01-26 23:13 ` [RFC PATCH 7/7] mm: Add config HUGE_IOMAP to enable huge I/O mappings Toshi Kani 2015-01-26 23:13 ` Toshi Kani
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