[PATCH v4 0/5] TLB/I$ flush cleanups and improvements

[Gary Guo <gary@garyguo.net>]

From: Gary Guo <gary@garyguo.net>

This is the v4 of the general TLB/I$ flush improvement series.
I still have tlbi_method=ipi being the default as opposed to what
Atish suggests, as:
* There are still usage of BBL in the wild
* OpenSBI's support isn't made into stable yet.
* OpenSBI's support on the dev branch has some racing issues yet to resolve.

Once most SBIs used in the wild can handle remote shootdown properly we can
the submit another patch to change the default value to tlbi_method=sbi again.

This patches does:
1. Move long and expensive functions aways from header files.
2. Fix missing arguments for SBI calls.
3. Performance improvements for TLB flush.
4. Implement IPI-based remote shootdown in case the SBI ignores ASID and
   vaddr operands.

Changes since v3:
 - Document tlbi_max_ops and tlbi_method in kernel-parameter.txt
 - Split IPI-based shootdown implementation into its own commit

Changes since v2:
 - Replace __setup with early_param
 - Rebase on top of for-next

Changes since v1:
 - Use kernel boot parameters instead of Kconfig
 - Style fixes

Gary Guo (5):
  riscv: move flush_icache_{all,mm} to cacheflush.c
  riscv: move switch_mm to its own file
  riscv: fix sbi_remote_sfence_vma{,_asid}.
  riscv: rewrite tlb flush for performance
  riscv: implement IPI-based remote TLB shootdown

 .../admin-guide/kernel-parameters.rst         |   1 +
 .../admin-guide/kernel-parameters.txt         |  13 ++
 arch/riscv/include/asm/cacheflush.h           |   2 +-
 arch/riscv/include/asm/mmu_context.h          |  59 +----
 arch/riscv/include/asm/pgtable.h              |   2 +-
 arch/riscv/include/asm/sbi.h                  |  19 +-
 arch/riscv/include/asm/tlbflush.h             |  76 +++----
 arch/riscv/kernel/smp.c                       |  49 ----
 arch/riscv/mm/Makefile                        |   2 +
 arch/riscv/mm/cacheflush.c                    |  61 +++++
 arch/riscv/mm/context.c                       |  77 +++++++
 arch/riscv/mm/init.c                          |   2 +-
 arch/riscv/mm/tlbflush.c                      | 215 ++++++++++++++++++
 13 files changed, 417 insertions(+), 161 deletions(-)
 create mode 100644 arch/riscv/mm/context.c
 create mode 100644 arch/riscv/mm/tlbflush.c

-- 
2.17.1


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