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([171.76.80.52]) by smtp.gmail.com with ESMTPSA id o20-20020a170903009400b0018685aaf41dsm6449055pld.18.2022.11.01.07.34.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Nov 2022 07:34:59 -0700 (PDT) From: Anup Patel To: Palmer Dabbelt , Paul Walmsley , Thomas Gleixner , Marc Zyngier , Daniel Lezcano Cc: Atish Patra , Alistair Francis , Anup Patel , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Anup Patel Subject: [PATCH v10 7/7] RISC-V: Use IPIs for remote icache flush when possible Date: Tue, 1 Nov 2022 20:04:00 +0530 Message-Id: <20221101143400.690000-8-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221101143400.690000-1-apatel@ventanamicro.com> References: <20221101143400.690000-1-apatel@ventanamicro.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" If we have specialized interrupt controller (such as AIA IMSIC) which allows supervisor mode to directly inject IPIs without any assistance from M-mode or HS-mode then using such specialized interrupt controller, we can do remote icache flushe directly from supervisor mode instead of using the SBI RFENCE calls. This patch extends remote icache flush functions to use supervisor mode IPIs whenever direct supervisor mode IPIs.are supported by interrupt controller. Signed-off-by: Anup Patel Reviewed-by: Atish Patra --- arch/riscv/mm/cacheflush.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c index 57b40a350420..f10cb47eac3a 100644 --- a/arch/riscv/mm/cacheflush.c +++ b/arch/riscv/mm/cacheflush.c @@ -19,7 +19,7 @@ void flush_icache_all(void) { local_flush_icache_all(); =20 - if (IS_ENABLED(CONFIG_RISCV_SBI)) + if (IS_ENABLED(CONFIG_RISCV_SBI) && !riscv_use_ipi_for_rfence()) sbi_remote_fence_i(NULL); else on_each_cpu(ipi_remote_fence_i, NULL, 1); @@ -67,7 +67,8 @@ void flush_icache_mm(struct mm_struct *mm, bool local) * with flush_icache_deferred(). */ smp_mb(); - } else if (IS_ENABLED(CONFIG_RISCV_SBI)) { + } else if (IS_ENABLED(CONFIG_RISCV_SBI) && + !riscv_use_ipi_for_rfence()) { sbi_remote_fence_i(&others); } else { on_each_cpu_mask(&others, ipi_remote_fence_i, NULL, 1); --=20 2.34.1