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From: Toshi Kani <toshi.kani@hp.com>
To: bp@alien8.de, hpa@zytor.com, tglx@linutronix.de,
	mingo@redhat.com, akpm@linux-foundation.org, arnd@arndb.de
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org,
	linux-nvdimm@lists.01.org, jgross@suse.com,
	stefan.bader@canonical.com, luto@amacapital.net, hmh@hmh.eng.br,
	yigal@plexistor.com, konrad.wilk@oracle.com, Elliott@hp.com,
	mcgrof@suse.com, hch@lst.de, Toshi Kani <toshi.kani@hp.com>
Subject: [PATCH v11 9/12] x86, mm, pat: Add pgprot_writethrough() for WT
Date: Fri, 29 May 2015 16:59:07 -0600	[thread overview]
Message-ID: <1432940350-1802-10-git-send-email-toshi.kani@hp.com> (raw)
In-Reply-To: <1432940350-1802-1-git-send-email-toshi.kani@hp.com>

From: Toshi Kani <toshi.kani@hp.com>

This patch adds pgprot_writethrough() for setting WT to a given
pgprot_t.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/include/asm/pgtable_types.h |    3 +++
 arch/x86/mm/pat.c                    |    7 +++++++
 include/asm-generic/pgtable.h        |    4 ++++
 3 files changed, 14 insertions(+)

diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index 78f0c8c..13f310b 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -367,6 +367,9 @@ extern int nx_enabled;
 #define pgprot_writecombine	pgprot_writecombine
 extern pgprot_t pgprot_writecombine(pgprot_t prot);
 
+#define pgprot_writethrough	pgprot_writethrough
+extern pgprot_t pgprot_writethrough(pgprot_t prot);
+
 /* Indicate that x86 has its own track and untrack pfn vma functions */
 #define __HAVE_PFNMAP_TRACKING
 
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 85c9fcb..1a2c84c 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -987,6 +987,13 @@ pgprot_t pgprot_writecombine(pgprot_t prot)
 }
 EXPORT_SYMBOL_GPL(pgprot_writecombine);
 
+pgprot_t pgprot_writethrough(pgprot_t prot)
+{
+	return __pgprot(pgprot_val(prot) |
+				cachemode2protval(_PAGE_CACHE_MODE_WT));
+}
+EXPORT_SYMBOL_GPL(pgprot_writethrough);
+
 #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_X86_PAT)
 
 static struct memtype *memtype_get_idx(loff_t pos)
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 39f1d6a..bd910ce 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -262,6 +262,10 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
 #define pgprot_writecombine pgprot_noncached
 #endif
 
+#ifndef pgprot_writethrough
+#define pgprot_writethrough pgprot_noncached
+#endif
+
 #ifndef pgprot_device
 #define pgprot_device pgprot_noncached
 #endif

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  parent reply	other threads:[~2015-05-29 23:19 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-29 22:58 [PATCH v11 0/12] Support Write-Through mapping on x86 Toshi Kani
2015-05-29 22:58 ` [PATCH v11 1/12] x86, mm, pat: Cleanup init flags in pat_init() Toshi Kani
2015-05-29 22:59 ` [PATCH v11 2/12] x86, mm, pat: Refactor !pat_enabled handling Toshi Kani
2015-05-31  9:46   ` Borislav Petkov
2015-05-31  9:48     ` [PATCH 1/4] x86/pat: Untangle pat_init() Borislav Petkov
2015-05-31  9:48       ` [PATCH 2/4] x86/pat: Merge pat_init_cache_modes() into its caller Borislav Petkov
2015-05-31 10:15         ` Juergen Gross
2015-05-31 10:24           ` Borislav Petkov
2015-05-31 10:23         ` Borislav Petkov
2015-05-31 11:02           ` Juergen Gross
2015-06-01 18:15           ` Toshi Kani
2015-05-31  9:48       ` [PATCH 3/4] x86/pat: Emulate PAT when it is disabled Borislav Petkov
2015-05-31  9:48       ` [PATCH 4/4] x86/pat: Remove pat_enabled() checks Borislav Petkov
2015-06-01 18:26         ` Toshi Kani
2015-06-01 18:51           ` Borislav Petkov
2015-06-01 16:17       ` [PATCH 1/4] x86/pat: Untangle pat_init() Toshi Kani
2015-06-01 15:50     ` [PATCH v11 2/12] x86, mm, pat: Refactor !pat_enabled handling Toshi Kani
2015-05-29 22:59 ` [PATCH v11 3/12] x86, mm, pat: Set WT to PA7 slot of PAT MSR Toshi Kani
2015-05-29 22:59 ` [PATCH v11 4/12] x86, mm, pat: Change reserve_memtype() for WT Toshi Kani
2015-05-29 22:59 ` [PATCH v11 5/12] x86, asm: Change is_new_memtype_allowed() " Toshi Kani
2015-05-29 22:59 ` [PATCH v11 6/12] x86, mm, asm-gen: Add ioremap_wt() " Toshi Kani
2015-05-30  9:18   ` Geert Uytterhoeven
2015-05-31  0:58     ` Toshi Kani
2015-05-29 22:59 ` [PATCH v11 7/12] arch/*/asm/io.h: Add ioremap_wt() to all architectures Toshi Kani
2015-05-29 22:59 ` [PATCH v11 8/12] video/fbdev, asm/io.h: Remove ioremap_writethrough() Toshi Kani
2015-05-29 22:59 ` Toshi Kani [this message]
2015-05-29 22:59 ` [PATCH v11 10/12] x86, mm, asm: Add WT support to set_page_memtype() Toshi Kani
2015-05-29 22:59 ` [PATCH v11 11/12] x86, mm: Add set_memory_wt() for WT Toshi Kani
2015-05-29 22:59 ` [PATCH v11 12/12] drivers/block/pmem: Map NVDIMM with ioremap_wt() Toshi Kani
2015-05-30  1:18   ` Dan Williams

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