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From: Charlie Jenkins <charlie@rivosinc.com>
Subject: [PATCH v4 0/2] riscv: Use Kconfig to set unaligned access speed
Date: Fri, 16 Feb 2024 12:33:17 -0800
Message-Id: <20240216-disable_misaligned_probe_config-v4-0-dc01e581c0ac@rivosinc.com>
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To: Paul Walmsley <paul.walmsley@sifive.com>, 
 Palmer Dabbelt <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>, 
 Jisheng Zhang <jszhang@kernel.org>, Evan Green <evan@rivosinc.com>, 
 =?utf-8?q?Cl=C3=A9ment_L=C3=A9ger?= <cleger@rivosinc.com>, 
 Eric Biggers <ebiggers@kernel.org>, 
 Elliot Berman <quic_eberman@quicinc.com>, Charles Lohr <lohr85@gmail.com>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, 
 Charlie Jenkins <charlie@rivosinc.com>

If the hardware unaligned access speed is known at compile time, it is
possible to avoid running the unaligned access speed probe to speedup
boot-time.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
---
Changes in v4:
- Add additional Kconfig options for the other unaligned access speeds
- Link to v3: https://lore.kernel.org/r/20240202-disable_misaligned_probe_config-v3-0-c44f91f03bb6@rivosinc.com

Changes in v3:
- Revert change to csum (Eric)
- Change ifndefs for ifdefs (Eric)
- Change config in Makefile (Elliot/Eric)
- Link to v2: https://lore.kernel.org/r/20240201-disable_misaligned_probe_config-v2-0-77c368bed7b2@rivosinc.com

Changes in v2:
- Move around definitions to reduce ifdefs (Clément)
- Make RISCV_MISALIGNED depend on !HAVE_EFFICIENT_UNALIGNED_ACCESS
  (Clément)
- Link to v1: https://lore.kernel.org/r/20240131-disable_misaligned_probe_config-v1-0-98d155e9cda8@rivosinc.com

---
Charlie Jenkins (2):
      riscv: lib: Introduce has_fast_misaligned_access function
      riscv: Set unalignment speed at compile time

 arch/riscv/Kconfig                          |  58 +++++-
 arch/riscv/include/asm/cpufeature.h         |  45 ++++-
 arch/riscv/kernel/Makefile                  |   6 +-
 arch/riscv/kernel/cpufeature.c              | 255 --------------------------
 arch/riscv/kernel/misaligned_access_speed.c | 265 ++++++++++++++++++++++++++++
 arch/riscv/kernel/probe_emulated_access.c   |  64 +++++++
 arch/riscv/kernel/sys_hwprobe.c             |  25 +++
 arch/riscv/kernel/traps_misaligned.c        |  54 +-----
 arch/riscv/lib/csum.c                       |   7 +-
 9 files changed, 454 insertions(+), 325 deletions(-)
---
base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
change-id: 20240131-disable_misaligned_probe_config-043aea375f93
-- 
- Charlie