From patchwork Tue Mar 28 03:52:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anup Patel X-Patchwork-Id: 13190442 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F1894C76195 for ; Tue, 28 Mar 2023 03:52:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=1LDs1Sykf4bK92Jpa3W8WYKebcpWZ+2aeVVIc8QBNB8=; b=q38+RW34Ng2lXm Q3gKLOZ4X/09xuLbo/cQmGcLwdd9rq1d79ULL2T8r+WdYCUzChruJtkCC/x7YLuL/uhKomDRnbxBR 3xJoSuPopwt2X7qEltKl3TH5c03Vag8wXqipepEqo8WpPQCIWQJQwoDQGnfKu8NvRMEN6F7gn55LR NqO7BBzkB8jG0/nyi1PDfaFtseMBE4iMrwtKu8XjuAl3lfca2R2dNv8v28+jkNszPjzF0sZzw34y0 BrhtZiqpZlHBSzxpVI0ehQg0buEHUwN/LSC76YNu2zV7vEZJ79fZDNqoLwtbALZUS7PAQNHKws51G C5UkYJ7RqUshcw7K3Y/w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1ph0O5-00D3hS-1a; Tue, 28 Mar 2023 03:52:45 +0000 Received: from mail-pl1-x62c.google.com ([2607:f8b0:4864:20::62c]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1ph0O1-00D3gr-1y for linux-riscv@lists.infradead.org; Tue, 28 Mar 2023 03:52:43 +0000 Received: by mail-pl1-x62c.google.com with SMTP id u10so10418160plz.7 for ; Mon, 27 Mar 2023 20:52:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1679975559; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=0X1U20lEzAxnpJOqRD0+hdkZTJGJXbE9eyWjA5fnnrA=; b=dio0VXCca4bvUGEYiZ1NTyb/R01sQrEhw3j2KcN5rqBTMkdbqglmZg9dnPwi6c7VIB cYp4baifMwQygysHOdbcrD8ic1Q2LPiCEO2qdzhovpApgCXHOSpo0ZWCGDvD0gaJaWMV AUNSauJ1JBTIM5kv4MN7BIuHPAVSfZ5FI233OKFhfShp8wUHwiSwZ8n/GejxpmDGhU9h wzO7ZH80GPXqVEDW0NvcSopr7leYU4JVeXtF+UdO7TQoxP3/RQr1Nak/WIkTMZtTbBcx SbInOYdp3bTULvlmCDWcIMTZDhnuzJ5qTg1HxmYte7mOi+Yqy/D1UHZMxBSEcfJUJEqE 1BDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679975559; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=0X1U20lEzAxnpJOqRD0+hdkZTJGJXbE9eyWjA5fnnrA=; b=dtn3K8aZcKIwsoXC1EK2H8z5+sPlu+kwTRmpkybyMQY4DFuy0E5NvrMB115KbzZj1A OD6UOhIMD+rQS0u9nrIidD7wteR732gytKFxoAtLrA96P63zEeROhyjJsrl7sLizoFam z98t47qp/JuUMwSUJXc+aKOAeYd8anScqvCq+HwYAUPfBnadneYEslQ3J5JR+5A9pG/5 baKaRY8xx6+J/nQwcQuEeUjHmE78Dq13nJQoA2OBJf5YXaMP1DMUnaV0GRwxkq3mrAVK e8lMicVWztvnnbkvRUekNbCzVNsfl1f25e0T1yFZYDyTf6NVnUnz6ht8P0vv3esULC15 Hi6A== X-Gm-Message-State: AAQBX9f4FctxMZv+ae/z6dgFbnVk1XgL7aAK8ykj1BoU8DH8nsb9dTtH +A5/nJtEcKdUUiMQORDvHuN9Ig== X-Google-Smtp-Source: AKy350Z4egSzSd+PjYETLw5d2cTTZElB35klYTf6+XBX7Fggin1yXfB53sJ8gJ6AFrzTbHHS1EAzmw== X-Received: by 2002:a17:902:e801:b0:199:3a4a:d702 with SMTP id u1-20020a170902e80100b001993a4ad702mr20096114plg.0.1679975559174; Mon, 27 Mar 2023 20:52:39 -0700 (PDT) Received: from anup-ubuntu-vm.localdomain ([171.76.82.104]) by smtp.gmail.com with ESMTPSA id g6-20020a170902740600b0019cb534a824sm19880278pll.172.2023.03.27.20.52.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Mar 2023 20:52:38 -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 v18 0/7] RISC-V IPI Improvements Date: Tue, 28 Mar 2023 09:22:16 +0530 Message-Id: <20230328035223.1480939-1-apatel@ventanamicro.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230327_205241_650194_2FDF541A X-CRM114-Status: GOOD ( 18.41 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.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) Linux RISC-V SWI support These patches can also be found in riscv_ipi_imp_v18 branch at: https://github.com/avpatel/linux.git Changes since v17: - Resolved merge conflicts and rebased on Linux-6.3-rc4 Changes since v16: - Rebased on Linux-6.3-rc1 - Dropped PATCH3 and PATCH9 since these patches are already merged - Added Palmer's Acked-by Changes since v15: - Rebased on Linux-6.2-rc2 - Added Reviewed-by and Tested-by tags to some of the patches. Changes since v14: - Minor fixes in commit description of PATCH3 (as suggested by tglx) - Don't disable parent IPI when CPU goes offline for SBI IPI driver and CLINT driver in PATCH4. - Include Apple AIC driver changes from Marc Z as PATCH9 Changes since v13: - Included changes suggested by Marc Z in PATCH3 - Use chained handlers in PATCH4 - Added new PATCH8 to have empty irq_eoi() in RISC-V INTC driver. This avoids the unnecessary mask/unmask dance at time of handling interrupts. Changes since v12: - Rebased on Linux-6.1-rc7 - Bring-back the IPI optimization in ipi_mux_send_mask() for PATCH3 - Call ipi_mux_send() for one target CPU at a time in PATCH3 Changes since v11: - Removed ipi_mux_pre/post_handle() callbacks in PATCH3 - Removed sturct ipi_mux_ops in PATCH3 - Removed parent_virq and data pointer from everywhere in PATCH3 - Removed struct ipi_mux_control in PATCH3 - Improved function signature of ipi_mux_send() callback in PATCH3 - Used unsigned type with atomic operation in PATCH3 Changes since v10: - Rebased on Linux-6.1-rc5 - Drop the "!(pending & ibit)" check in ipi_mux_send_mask() of PATCH3 - Disable local interrupts in ipi_mux_send_mask() of PATCH3 because we can be preempted while using a per-CPU temporary variable. Changes since v9: - Rebased on Linux-6.1-rc3 - Updated header comment block of ipi-mux.c in PATCH3 - Use a struct for global data of ipi-mux.c in PATCH3 - Add per-CPU temp cpumask for sending IPIs in PATCH3 - Drop the use of fwspec in PATCH3 - Use static key for ipi_mux_pre_handle() and ipi_mux_post_handle() in PATCH3 - Remove redundant pr_warn_ratelimited() called by ipi_mux_process() in PATCH3 - Remove CPUHP thingy from ipi_mux_create() in PATCH3 Changes since v8: - Rebased on Linux-6.0-rc3 - Use dummy percpu data as parameter for request_percpu_irq() in PATCH4. Changes since v7: - Rebased on Linux-6.0-rc1 - Use atomic operations to track per-CPU pending and enabled IPIs in PATCH3. (Note: this is inspired from IPI muxing implemented in drivers/irqchip/irq-apple-aic.c) - Made "struct ipi_mux_ops" (added by PATCH3) flexible so that drivers/irqchip/irq-apple-aic.c can adopt it in future. Changes since v6: - Rebased on Linux-5.19-rc7 - Added documentation for struct ipi_mux_ops in PATCH3 - Dropped dummy irq_mask()/unmask() in PATCH3 - Added const for "ipi_mux_chip" in PATCH3 - Removed "type" initialization from ipi_mux_domain_alloc() in PATCH3 - Dropped translate() from "ipi_mux_domain_ops" in PATCH3 - Improved barrier documentation in ipi_mux_process() of PATCH3 - Added percpu check in ipi_mux_create() for parent_virq of PATCH3 - Added nr_ipi parameter in ipi_mux_create() of PATCH3 Changes since v5: - Rebased on Linux-5.18-rc3 - Used kernel doc style in PATCH3 - Removed redundant loop in ipi_mux_process() of PATCH3 - Removed "RISC-V" prefix form ipi_mux_chip.name of PATCH3 - Removed use of "this patch" in PATCH3 commit description - Addressed few other nit comments in PATCH3 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 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 irqchip/riscv-intc: Add empty irq_eoi() for chained irq handlers arch/riscv/Kconfig | 2 + arch/riscv/include/asm/irq.h | 4 + arch/riscv/include/asm/sbi.h | 9 +- 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 | 77 ++++++++++++++ arch/riscv/kernel/sbi.c | 100 +++-------------- arch/riscv/kernel/smp.c | 171 +++++++++++++++--------------- arch/riscv/kernel/smpboot.c | 5 +- arch/riscv/mm/cacheflush.c | 5 +- arch/riscv/mm/tlbflush.c | 93 +++++++++++++--- drivers/clocksource/timer-clint.c | 65 +++++++++--- drivers/irqchip/Kconfig | 1 + drivers/irqchip/irq-riscv-intc.c | 71 ++++++++----- 16 files changed, 429 insertions(+), 248 deletions(-) create mode 100644 arch/riscv/kernel/sbi-ipi.c