[PATCH v4 0/2] arm64: change PoC D-cache flush to PoU

[Ashok Kumar]

For keeping I and D coherent, dcache flush till PoU(Point of Unification)
should be sufficient instead of doing till PoC(Point of coherence).
In SoC with more levels of cache, there could be a performance hit in doing
flush till PoC as __flush_dcache_area does both flush and invalidate.
Introduced new API __clean_dcache_area_pou which does only clean till PoU.

Also deferred dcache flush in __cpu_copy_user_page to __sync_icache_dcache.

changes since v3 [3]:
  * Moved dcache_by_line_op macro from cache.S to proc-macros.S as per
    Will Deacon's review comment.
  * Amended patch 2/2 commit log as per Catalin's review comment.

changes since v2 [2]:
 Incorporated Mark Rutland's review comments of
  * fixing comments
  * creating a helper function for __sync_icache_dcache.

changes since v1 [1]:
 Incorporated Mark Rutland's review comments of
  * renaming __flush_dcache_area_pou to __clean_dcache_area_pou
  * using inner shareable domain for dsb in __clean_dcache_area_pou
  * having a common macro for __flush_dcache_area and
    __clean_dcache_area_pou.

Thanks,
Ashok

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-December/393527.html
[2] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-December/393837.html
[3] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-December/394150.html

Ashok Kumar (2):
  arm64: Defer dcache flush in __cpu_copy_user_page
  arm64: Use PoU cache instr for I/D coherency

 arch/arm64/include/asm/cacheflush.h |  1 +
 arch/arm64/mm/cache.S               | 28 +++++++++++++++++-----------
 arch/arm64/mm/copypage.c            |  3 ++-
 arch/arm64/mm/flush.c               | 33 ++++++++++++++++++---------------
 arch/arm64/mm/proc-macros.S         | 22 ++++++++++++++++++++++
 5 files changed, 60 insertions(+), 27 deletions(-)

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2.1.0