From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DAEA0C433F5 for ; Thu, 24 Mar 2022 15:14:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351228AbiCXPPh (ORCPT ); Thu, 24 Mar 2022 11:15:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36000 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243416AbiCXPPf (ORCPT ); Thu, 24 Mar 2022 11:15:35 -0400 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8338249F8E for ; Thu, 24 Mar 2022 08:14:03 -0700 (PDT) Received: by mail-pl1-x62a.google.com with SMTP id y6so2463108plg.2 for ; Thu, 24 Mar 2022 08:14:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=/lHQwYCz6iMd1XYierGzMlVkOLDpnchjw8A/t5vp6xQ=; b=UABAOxJzfwjqipTEfrpgHIDYtfS42ghYAxlCG9X9F4EcQR6zMncrbecT+H3Tz+DPnP qskduDciaHgzsfc9Tw4cEbXt5mJrdMoVh/mvPXB0mpjLNMf26IUToeO21tUr3SgwafgE o4RAIPikGlHr3Ptcw02hgIGeYSTpDQGqQpDxL9ecJmJQp328ozU15VtzeK8PN0TrGi/T SNFGhUpg/dGmukBd0PFNmYdPaGIh9v4yG8nyfldh1U0AkBy9PaJpW7TXoMWbdQ0aFovh W6AOM12lPGLtZ7mBGa0xKCA8JY7xCUmR4DxXE2Mz3hbxM3mrktxHOz241Zm4de3ELW+u rWbQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=/lHQwYCz6iMd1XYierGzMlVkOLDpnchjw8A/t5vp6xQ=; b=mzABAsQqnDvOy170Ss3TJomCf0LoRf40ztxWUTJPXaCeHv9QOrhhFtN4Kta8BqppwD VquFlP7Kw+Vz3tfmw4jouSJg1UFwt9blIF61E9RUdaaV6o3tNwxKlwvETCaDTfA6AbH6 K23spCLetzVTym6qYz4pkuAZwfshJno/Y4uAar+nbDTthESlLt9BQL/HVwsuejg7A/W8 tmZiYMlNfUMuKaczVxAQqC4vGFLZTjMS9c9LKRDLbohzKR3Vd6QYOmHWym4R9iq6yBVm qtGcx30b/NyFdeoKBtSERf8tzPVK2jPjXWI2YV9lVIIZwEuCoVlDSgpWPX7+4wzZ+4+Y xtnA== X-Gm-Message-State: AOAM530iM70t1B58WaMSSpP0dVnJj28hp/wCH1gvdHlQCcS/qgGMRXAf D6zYNoHJIsXo471ZIZLn1XO5eA== X-Google-Smtp-Source: ABdhPJxd6U3Ruv7PpJ436PVg71gkDyH1nkaWTeT7Uk4oN78ga7bi4rqlCshe73IUNVBMkb12y+Cbyw== X-Received: by 2002:a17:903:240c:b0:153:c8df:7207 with SMTP id e12-20020a170903240c00b00153c8df7207mr6372719plo.44.1648134842828; Thu, 24 Mar 2022 08:14:02 -0700 (PDT) Received: from localhost.localdomain ([122.171.187.87]) by smtp.gmail.com with ESMTPSA id f16-20020a056a00239000b004fa7103e13csm4166065pfc.41.2022.03.24.08.13.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Mar 2022 08:14:02 -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 v5 0/7] RISC-V IPI Improvements Date: Thu, 24 Mar 2022 20:42:51 +0530 Message-Id: <20220324151258.943896-1-apatel@ventanamicro.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This series aims to improve IPI support in Linux RISC-V in following ways: 1) Treat IPIs as normal per-CPU interrupts instead of having custom RISC-V specific hooks. This also makes Linux RISC-V IPI support aligned with other architectures. 2) Remote TLB flushes and icache flushes should prefer local IPIs instead of SBI calls whenever we have specialized hardware (such as RISC-V AIA IMSIC and RISC-V SWI) which allows S-mode software to directly inject IPIs without any assistance from M-mode runtime firmware. These patches were originally part of the "Linux RISC-V ACLINT Support" series but this now a separate series so that it can be merged independently of the "Linux RISC-V ACLINT Support" series. (Refer, https://lore.kernel.org/lkml/20211007123632.697666-1-anup.patel@wdc.com/) These patches are also a preparatory patches for the up-coming: 1) Linux RISC-V AIA support 2) KVM RISC-V TLB flush improvements 3) Linux RISC-V SWI support These patches can also be found in riscv_ipi_imp_v5 branch at: https://github.com/avpatel/linux.git Changes since v4: - Rebased on Linux-5.17 - Includes new PATCH3 which adds mechanism to multiplex a single HW IPI Changes since v3: - Rebased on Linux-5.17-rc6 - Updated PATCH2 to not export riscv_set_intc_hwnode_fn() - Simplified riscv_intc_hwnode() in PATCH2 Changes since v2: - Rebased on Linux-5.17-rc4 - Updated PATCH2 to not create synthetic INTC fwnode and instead provide a function which allows drivers to directly discover INTC fwnode Changes since v1: - Use synthetic fwnode for INTC instead of irq_set_default_host() in PATCH2 Anup Patel (7): RISC-V: Clear SIP bit only when using SBI IPI operations irqchip/riscv-intc: Allow drivers to directly discover INTC hwnode genirq: Add mechanism to multiplex a single HW IPI RISC-V: Treat IPIs as normal Linux IRQs RISC-V: Allow marking IPIs as suitable for remote FENCEs RISC-V: Use IPIs for remote TLB flush when possible RISC-V: Use IPIs for remote icache flush when possible arch/riscv/Kconfig | 2 + arch/riscv/include/asm/irq.h | 4 + arch/riscv/include/asm/sbi.h | 2 + arch/riscv/include/asm/smp.h | 49 +++++--- arch/riscv/kernel/Makefile | 1 + arch/riscv/kernel/cpu-hotplug.c | 3 +- arch/riscv/kernel/irq.c | 21 +++- arch/riscv/kernel/sbi-ipi.c | 60 ++++++++++ arch/riscv/kernel/sbi.c | 11 -- arch/riscv/kernel/smp.c | 164 +++++++++++++------------- arch/riscv/kernel/smpboot.c | 5 +- arch/riscv/mm/cacheflush.c | 5 +- arch/riscv/mm/tlbflush.c | 93 ++++++++++++--- drivers/clocksource/timer-clint.c | 41 +++++-- drivers/irqchip/irq-riscv-intc.c | 60 +++++----- include/linux/irq.h | 28 +++++ kernel/irq/Kconfig | 4 + kernel/irq/Makefile | 1 + kernel/irq/ipi-mux.c | 190 ++++++++++++++++++++++++++++++ 19 files changed, 577 insertions(+), 167 deletions(-) create mode 100644 arch/riscv/kernel/sbi-ipi.c create mode 100644 kernel/irq/ipi-mux.c -- 2.25.1