From patchwork Wed Aug 5 18:12:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robert Foley X-Patchwork-Id: 11702141 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 51B27913 for ; Wed, 5 Aug 2020 18:22:15 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 28D4F22CA0 for ; Wed, 5 Aug 2020 18:22:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="E/xsOwj1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 28D4F22CA0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:37372 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k3O3K-0004U3-AI for patchwork-qemu-devel@patchwork.kernel.org; Wed, 05 Aug 2020 14:22:14 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50066) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k3Nyx-0004eW-Nx for qemu-devel@nongnu.org; Wed, 05 Aug 2020 14:17:44 -0400 Received: from mail-pg1-x541.google.com ([2607:f8b0:4864:20::541]:45852) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1k3Nyw-0006VE-0u for qemu-devel@nongnu.org; Wed, 05 Aug 2020 14:17:43 -0400 Received: by mail-pg1-x541.google.com with SMTP id x6so9768012pgx.12 for ; Wed, 05 Aug 2020 11:17:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=YM01JZCOBFTkObfq+41JWuhzyHiJWJ7EohnvO1vdIJU=; b=E/xsOwj1out5jTDw1B6uHewMdZZssRhI0qYSGvOkDZ8q6nMosifaO3SUYGRsaBrefG lCS6oar456DouWXOhlB8jJwebXTQJBkXUBBT3yMi31IV4n5ivkGztic6TDWfqGKUTl5J dAlDI4wDLoElA1Q13fhWkuZPLGirHNQtYZtr5WQyIXDJFAs/T0fzVaQZ5E1tBjz1E//v cLbSnZVD5h+HDdfIPibvT7lx4V5TC18YZc3vgwxZLDCp+E9ZEHLOre+dDUhrjxPxDDyD ETTYsY8MPdmf7V0Kgh2qNVG73U/Heu4NEuXS+HXK0q5RG4oD5BFGQqJXDJAI9Me8IAoI vuiw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=YM01JZCOBFTkObfq+41JWuhzyHiJWJ7EohnvO1vdIJU=; b=HKCqMhJRNBgOe9v91gCcMTZTwsUkMgraDPYZx4tYopsyh+OD+wIeNPC4T7PrlGLAZZ TBRG5fMM5Y1gClBpEGEdpwoC6BtSXvJdh5sVHZpVSasevyOqJmvCNdFM2Ru3MzaGFOsq JIY/1rfFjw9ZZfYEnRZIWVx7MIC/vuTJHueRPTdTJ/VkQGCYsGLKdpBRuoEDSIal+BiJ UfeQkMEus57YyUUixqhxfHeM0VMvDZuFkhN8FU2btXCg7qg7BMGeMRE6T9i/sxBsv7x9 cOzyqX0AM4IVZ2tjManWEykUtbGmfKHtn2+IepWR4dnJggS757SbJ4n7yeAAl9v2XyoL wszg== X-Gm-Message-State: AOAM531DIrA7tfrRFkVeoduLeayNzm71KNXNXagOACH0Z34qIbeSaiQH UFNofoRrbGu/AOu/ihdQx7kUVHA7Nvk= X-Google-Smtp-Source: ABdhPJxjuA9Ylj1mq4sVihjlFA2l6FIIAeNxChpioXsJuOaar6eJVj1oCra0DTnrID81k0Z6xroI4A== X-Received: by 2002:a62:647:: with SMTP id 68mr4820009pfg.45.1596651460295; Wed, 05 Aug 2020 11:17:40 -0700 (PDT) Received: from Rfoley-MA01.hsd1.ma.comcast.net ([2601:199:4480:60c0:38ab:50b1:ff8a:26ef]) by smtp.gmail.com with ESMTPSA id a15sm3670196pfo.185.2020.08.05.11.17.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Aug 2020 11:17:39 -0700 (PDT) From: Robert Foley To: qemu-devel@nongnu.org Subject: [PATCH v1 15/21] target/riscv: add BQL to do_interrupt and cpu_exec_interrupt Date: Wed, 5 Aug 2020 14:12:57 -0400 Message-Id: <20200805181303.7822-16-robert.foley@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200805181303.7822-1-robert.foley@linaro.org> References: <20200805181303.7822-1-robert.foley@linaro.org> Received-SPF: pass client-ip=2607:f8b0:4864:20::541; envelope-from=robert.foley@linaro.org; helo=mail-pg1-x541.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alistair Francis , "open list:RISC-V TCG CPUs" , robert.foley@linaro.org, Sagar Karandikar , Bastian Koppelmann , cota@braap.org, Palmer Dabbelt , peter.puhov@linaro.org, pbonzini@redhat.com, alex.bennee@linaro.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" This is part of a series of changes to remove the implied BQL from the common code of cpu_handle_interrupt and cpu_handle_exception. As part of removing the implied BQL from the common code, we are pushing the BQL holding down into the per-arch implementation functions of do_interrupt and cpu_exec_interrupt. The purpose of this set of changes is to set the groundwork so that an arch could move towards removing the BQL from the cpu_handle_interrupt/exception paths. This approach was suggested by Paolo Bonzini. For reference, here are two key posts in the discussion, explaining the reasoning/benefits of this approach. https://lists.gnu.org/archive/html/qemu-devel/2020-07/msg08731.html https://lists.gnu.org/archive/html/qemu-devel/2020-08/msg00044.html Signed-off-by: Robert Foley --- target/riscv/cpu_helper.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c index 75d2ae3434..5050802e95 100644 --- a/target/riscv/cpu_helper.c +++ b/target/riscv/cpu_helper.c @@ -80,14 +80,17 @@ bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request) { #if !defined(CONFIG_USER_ONLY) if (interrupt_request & CPU_INTERRUPT_HARD) { + qemu_mutex_lock_iothread(); RISCVCPU *cpu = RISCV_CPU(cs); CPURISCVState *env = &cpu->env; int interruptno = riscv_cpu_local_irq_pending(env); if (interruptno >= 0) { cs->exception_index = RISCV_EXCP_INT_FLAG | interruptno; riscv_cpu_do_interrupt(cs); + qemu_mutex_unlock_iothread(); return true; } + qemu_mutex_unlock_iothread(); } #endif return false; @@ -822,6 +825,10 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, */ void riscv_cpu_do_interrupt(CPUState *cs) { + bool bql = !qemu_mutex_iothread_locked(); + if (bql) { + qemu_mutex_lock_iothread(); + } #if !defined(CONFIG_USER_ONLY) RISCVCPU *cpu = RISCV_CPU(cs); @@ -982,4 +989,7 @@ void riscv_cpu_do_interrupt(CPUState *cs) #endif cs->exception_index = EXCP_NONE; /* mark handled to qemu */ + if (bql) { + qemu_mutex_unlock_iothread(); + } }