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From: Toshi Kani <toshi.kani@hp.com>
To: 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,
	jgross@suse.com, stefan.bader@canonical.com, luto@amacapital.net,
	hmh@hmh.eng.br, yigal@plexistor.com, konrad.wilk@oracle.com,
	Elliott@hp.com
Subject: [PATCH v8 0/7] Support Write-Through mapping on x86
Date: Tue, 24 Feb 2015 17:14:54 -0700	[thread overview]
Message-ID: <1424823301-30927-1-git-send-email-toshi.kani@hp.com> (raw)

This patchset adds support of Write-Through (WT) mapping on x86.
The study below shows that using WT mapping may be useful for
non-volatile memory.

http://www.hpl.hp.com/techreports/2012/HPL-2012-236.pdf

All new/modified interfaces have been tested.

v8:
- Rebased to 4.0-rc1 and resolved conflicts with 9d34cfdf4 in
  patch 5/7.

v7:
- Rebased to 3.19-rc3 as Juergen's patchset for the PAT management
  has been accepted.

v6:
- Dropped the patch moving [set|get]_page_memtype() to pat.c
  since the tip branch already has this change.
- Fixed an issue when CONFIG_X86_PAT is not defined.

v5:
- Clarified comment of why using slot 7. (Andy Lutomirski,
  Thomas Gleixner)
- Moved [set|get]_page_memtype() to pat.c. (Thomas Gleixner)
- Removed BUG() from set_page_memtype(). (Thomas Gleixner)

v4:
- Added set_memory_wt() by adding WT support of regular memory.

v3:
- Dropped the set_memory_wt() patch. (Andy Lutomirski)
- Refactored the !pat_enabled handling. (H. Peter Anvin,
  Andy Lutomirski)
- Added the picture of PTE encoding. (Konrad Rzeszutek Wilk)

v2:
- Changed WT to use slot 7 of the PAT MSR. (H. Peter Anvin,
  Andy Lutomirski)
- Changed to have conservative checks to exclude all Pentium 2, 3,
  M, and 4 families. (Ingo Molnar, Henrique de Moraes Holschuh,
  Andy Lutomirski)
- Updated documentation to cover WT interfaces and usages.
  (Andy Lutomirski, Yigal Korman)

---
Toshi Kani (7):
1/7 x86, mm, pat: Set WT to PA7 slot of PAT MSR
2/7 x86, mm, pat: Change reserve_memtype() to handle WT
3/7 x86, mm, asm-gen: Add ioremap_wt() for WT
4/7 x86, mm, pat: Add pgprot_writethrough() for WT
5/7 x86, mm, pat: Refactor !pat_enable handling
6/7 x86, mm, asm: Add WT support to set_page_memtype()
7/7 x86, mm: Add set_memory_wt() for WT

---
 Documentation/x86/pat.txt            |  13 ++-
 arch/x86/include/asm/cacheflush.h    |   6 +-
 arch/x86/include/asm/io.h            |   2 +
 arch/x86/include/asm/pgtable_types.h |   3 +
 arch/x86/mm/init.c                   |   6 +-
 arch/x86/mm/iomap_32.c               |  12 +--
 arch/x86/mm/ioremap.c                |  26 ++++-
 arch/x86/mm/pageattr.c               |  61 +++++++++--
 arch/x86/mm/pat.c                    | 194 ++++++++++++++++++++++++-----------
 include/asm-generic/io.h             |   9 ++
 include/asm-generic/iomap.h          |   4 +
 include/asm-generic/pgtable.h        |   4 +
 12 files changed, 251 insertions(+), 89 deletions(-)


             reply	other threads:[~2015-02-25  0:15 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-25  0:14 Toshi Kani [this message]
2015-02-25  0:14 ` [PATCH v8 1/7] x86, mm, pat: Set WT to PA7 slot of PAT MSR Toshi Kani
2015-02-25  0:14 ` [PATCH v8 2/7] x86, mm, pat: Change reserve_memtype() to handle WT Toshi Kani
2015-02-25  0:14 ` [PATCH v8 3/7] x86, mm, asm-gen: Add ioremap_wt() for WT Toshi Kani
2015-02-25  0:14 ` [PATCH v8 4/7] x86, mm, pat: Add pgprot_writethrough() " Toshi Kani
2015-02-25  0:14 ` [PATCH v8 5/7] x86, mm, pat: Refactor !pat_enabled handling Toshi Kani
2015-02-25  0:15 ` [PATCH v8 6/7] x86, mm, asm: Add WT support to set_page_memtype() Toshi Kani
2015-02-25  0:15 ` [PATCH v8 7/7] x86, mm: Add set_memory_wt() for WT Toshi Kani
2015-02-25  7:22   ` Ingo Molnar
2015-02-25 15:20     ` Toshi Kani
2015-02-26 11:30       ` Ingo Molnar
2015-02-26 14:44         ` Toshi Kani
2015-03-04 18:27           ` Toshi Kani

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