From: Charlie Jenkins <charlie@rivosinc.com> 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>, "Clément Léger" <cleger@rivosinc.com> Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Charlie Jenkins <charlie@rivosinc.com> Subject: [PATCH v2 0/2] riscv: Use CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS to set misaligned access speed Date: Thu, 01 Feb 2024 15:30:44 -0800 [thread overview] Message-ID: <20240201-disable_misaligned_probe_config-v2-0-77c368bed7b2@rivosinc.com> (raw) If CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS is enabled, no time needs to be spent in the misaligned access speed probe. Disable the probe in this case and set respective uses to "fast" misaligned accesses. On riscv, this config is selected if RISCV_EFFICIENT_UNALIGNED_ACCESS is selected, which is dependent on NONPORTABLE. Signed-off-by: Charlie Jenkins <charlie@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: Disable misaligned access probe when CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS arch/riscv/Kconfig | 1 + arch/riscv/include/asm/cpufeature.h | 22 +- arch/riscv/include/asm/misaligned_access_speed.h | 29 +++ arch/riscv/kernel/Makefile | 3 + arch/riscv/kernel/cpufeature.c | 255 ---------------------- arch/riscv/kernel/misaligned_access_speed.c | 265 +++++++++++++++++++++++ arch/riscv/kernel/sys_hwprobe.c | 4 + arch/riscv/lib/csum.c | 7 +- 8 files changed, 321 insertions(+), 265 deletions(-) --- base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d change-id: 20240131-disable_misaligned_probe_config-043aea375f93 -- - Charlie _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv
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From: Charlie Jenkins <charlie@rivosinc.com> 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>, "Clément Léger" <cleger@rivosinc.com> Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Charlie Jenkins <charlie@rivosinc.com> Subject: [PATCH v2 0/2] riscv: Use CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS to set misaligned access speed Date: Thu, 01 Feb 2024 15:30:44 -0800 [thread overview] Message-ID: <20240201-disable_misaligned_probe_config-v2-0-77c368bed7b2@rivosinc.com> (raw) If CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS is enabled, no time needs to be spent in the misaligned access speed probe. Disable the probe in this case and set respective uses to "fast" misaligned accesses. On riscv, this config is selected if RISCV_EFFICIENT_UNALIGNED_ACCESS is selected, which is dependent on NONPORTABLE. Signed-off-by: Charlie Jenkins <charlie@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: Disable misaligned access probe when CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS arch/riscv/Kconfig | 1 + arch/riscv/include/asm/cpufeature.h | 22 +- arch/riscv/include/asm/misaligned_access_speed.h | 29 +++ arch/riscv/kernel/Makefile | 3 + arch/riscv/kernel/cpufeature.c | 255 ---------------------- arch/riscv/kernel/misaligned_access_speed.c | 265 +++++++++++++++++++++++ arch/riscv/kernel/sys_hwprobe.c | 4 + arch/riscv/lib/csum.c | 7 +- 8 files changed, 321 insertions(+), 265 deletions(-) --- base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d change-id: 20240131-disable_misaligned_probe_config-043aea375f93 -- - Charlie
next reply other threads:[~2024-02-01 23:30 UTC|newest] Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-02-01 23:30 Charlie Jenkins [this message] 2024-02-01 23:30 ` [PATCH v2 0/2] riscv: Use CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS to set misaligned access speed Charlie Jenkins 2024-02-01 23:30 ` [PATCH v2 1/2] riscv: lib: Introduce has_fast_misaligned_access function Charlie Jenkins 2024-02-01 23:30 ` Charlie Jenkins 2024-02-02 22:49 ` Eric Biggers 2024-02-02 22:49 ` Eric Biggers 2024-02-02 23:11 ` Charlie Jenkins 2024-02-02 23:11 ` Charlie Jenkins 2024-02-01 23:30 ` [PATCH v2 2/2] riscv: Disable misaligned access probe when CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS Charlie Jenkins 2024-02-01 23:30 ` Charlie Jenkins 2024-02-02 4:31 ` Elliot Berman 2024-02-02 4:31 ` Elliot Berman 2024-02-02 4:55 ` Charlie Jenkins 2024-02-02 4:55 ` Charlie Jenkins 2024-02-02 23:01 ` Eric Biggers 2024-02-02 23:01 ` Eric Biggers 2024-02-02 23:13 ` Charlie Jenkins 2024-02-02 23:13 ` Charlie Jenkins
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