From patchwork Thu May 21 16:38:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Robert Foley X-Patchwork-Id: 1295353 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256 header.s=google header.b=kZidtQ0X; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 49Sb6X0pRVz9sSW for ; Fri, 22 May 2020 02:43:48 +1000 (AEST) Received: from localhost ([::1]:49944 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jboIL-0001dY-Qj for incoming@patchwork.ozlabs.org; Thu, 21 May 2020 12:43:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49640) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jboHu-0001bi-JE for qemu-devel@nongnu.org; Thu, 21 May 2020 12:43:18 -0400 Received: from mail-qk1-x742.google.com ([2607:f8b0:4864:20::742]:45672) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jboHt-0006T4-IM for qemu-devel@nongnu.org; Thu, 21 May 2020 12:43:18 -0400 Received: by mail-qk1-x742.google.com with SMTP id i5so7786049qkl.12 for ; Thu, 21 May 2020 09:43:17 -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 :mime-version:content-transfer-encoding; bh=bON7YUxlhwgscX2SUVnZ4d6zlp9keY1L8USoWVcvoFg=; b=kZidtQ0XENdeengyKKW4whn3w3BbFo8YAwMqvx5iCkzwRhHySJ6WNbeEEBV9SLiM4p 3dY/l1Ix/L/OzICp0SH2GNfc0SNqx9sQqfAIEskmmRYjLuhpIw9LaoRzKzT+ND8r/n2k Guf3KKhTPDlCkaJOq/7rjUWwnCocoDCYuJ8NKvXwzftHxSmJ3V83qqtQ59xC8B+Haf7s 3DRP1EyOLMI9cm7883IuuRcxAqtVgxZWQU4YEJ7u7EO//cS3LKnxFMOr+9QX60/wSC5m h9TUbFzLloi9gzijPehgfrd385Ztj298vJn/RuNZhgRV9l9J2G9Jc5a8hrk1WAygY6Wf DNKw== 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:mime-version:content-transfer-encoding; bh=bON7YUxlhwgscX2SUVnZ4d6zlp9keY1L8USoWVcvoFg=; b=Bh2mZbArXLa2ypSOe3RXVkDSf6wgfBLpG7eNxyH7gKYy9bspvYob96cKxBO5pk4g7N dzdPCN4U1sj8e9lSpQ1LyUmLUqbBL5aem4sMzdbr1Fp2yTgastzUpmGCwtJz6T/pPxWN LsIeKyg5T2mH5YCMyIIRVfx11Za+kNPMss3aOvN7bVtZzuZugYwscaraUUH9fPk9pus0 feffF9gbjSNlTNaDv9zXBolYt3IpT+RpUlVgvXYuliZ53B8wrDxnxnnCwincd/wDyoKQ 5FYrQHW/nEpq5wyGWaQ7yzQ7SlFDIJaJnciqUU15r5yvVDwBC7B8T2AjaF+iCRIHMBvD BD6A== X-Gm-Message-State: AOAM533p8wdi2n+CH1joqmqr9GY0jK8t1KZbt/Njyq97sFmeqJCxZ0rJ s7QMF7sbz3d+8FCBmz/VrBaQ7FTgbSuKMA== X-Google-Smtp-Source: ABdhPJyWocePND1w9eVhDHgqmbLFLBR00tujlFaGNijLepzgdvSHnUAK8NBlHiP2m3pkSiJpo4t2aA== X-Received: by 2002:a37:f517:: with SMTP id l23mr10957493qkk.475.1590079396278; Thu, 21 May 2020 09:43:16 -0700 (PDT) Received: from Rfoley-MA01.hsd1.ma.comcast.net ([2601:199:4480:60c0:1944:c530:655c:5583]) by smtp.gmail.com with ESMTPSA id x24sm5923829qth.57.2020.05.21.09.43.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 May 2020 09:43:15 -0700 (PDT) From: Robert Foley To: qemu-devel@nongnu.org Subject: [PATCH v9 02/74] cpu: rename cpu->work_mutex to cpu->lock Date: Thu, 21 May 2020 12:38:59 -0400 Message-Id: <20200521164011.638-3-robert.foley@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200521164011.638-1-robert.foley@linaro.org> References: <20200521164011.638-1-robert.foley@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::742; envelope-from=robert.foley@linaro.org; helo=mail-qk1-x742.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_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN 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: richard.henderson@linaro.org, cota@braap.org, alex.bennee@linaro.org, robert.foley@linaro.org, peter.puhov@linaro.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: "Emilio G. Cota" This lock will soon protect more fields of the struct. Give it a more appropriate name. Reviewed-by: Richard Henderson Reviewed-by: Alex Bennée Signed-off-by: Emilio G. Cota Signed-off-by: Robert Foley --- cpus-common.c | 14 +++++++------- cpus.c | 4 ++-- hw/core/cpu.c | 4 ++-- include/hw/core/cpu.h | 6 ++++-- 4 files changed, 15 insertions(+), 13 deletions(-) diff --git a/cpus-common.c b/cpus-common.c index 210fc7fc39..34025923e3 100644 --- a/cpus-common.c +++ b/cpus-common.c @@ -105,10 +105,10 @@ struct qemu_work_item { static void queue_work_on_cpu(CPUState *cpu, struct qemu_work_item *wi) { - qemu_mutex_lock(&cpu->work_mutex); + qemu_mutex_lock(&cpu->lock); QSIMPLEQ_INSERT_TAIL(&cpu->work_list, wi, node); wi->done = false; - qemu_mutex_unlock(&cpu->work_mutex); + qemu_mutex_unlock(&cpu->lock); qemu_cpu_kick(cpu); } @@ -300,15 +300,15 @@ void process_queued_cpu_work(CPUState *cpu) { struct qemu_work_item *wi; - qemu_mutex_lock(&cpu->work_mutex); + qemu_mutex_lock(&cpu->lock); if (QSIMPLEQ_EMPTY(&cpu->work_list)) { - qemu_mutex_unlock(&cpu->work_mutex); + qemu_mutex_unlock(&cpu->lock); return; } while (!QSIMPLEQ_EMPTY(&cpu->work_list)) { wi = QSIMPLEQ_FIRST(&cpu->work_list); QSIMPLEQ_REMOVE_HEAD(&cpu->work_list, node); - qemu_mutex_unlock(&cpu->work_mutex); + qemu_mutex_unlock(&cpu->lock); if (wi->exclusive) { /* Running work items outside the BQL avoids the following deadlock: * 1) start_exclusive() is called with the BQL taken while another @@ -324,13 +324,13 @@ void process_queued_cpu_work(CPUState *cpu) } else { wi->func(cpu, wi->data); } - qemu_mutex_lock(&cpu->work_mutex); + qemu_mutex_lock(&cpu->lock); if (wi->free) { g_free(wi); } else { atomic_mb_set(&wi->done, true); } } - qemu_mutex_unlock(&cpu->work_mutex); + qemu_mutex_unlock(&cpu->lock); qemu_cond_broadcast(&qemu_work_cond); } diff --git a/cpus.c b/cpus.c index af44027549..77a2d7b7cf 100644 --- a/cpus.c +++ b/cpus.c @@ -101,9 +101,9 @@ static inline bool cpu_work_list_empty(CPUState *cpu) { bool ret; - qemu_mutex_lock(&cpu->work_mutex); + qemu_mutex_lock(&cpu->lock); ret = QSIMPLEQ_EMPTY(&cpu->work_list); - qemu_mutex_unlock(&cpu->work_mutex); + qemu_mutex_unlock(&cpu->lock); return ret; } diff --git a/hw/core/cpu.c b/hw/core/cpu.c index 77703d62b7..4d58399cfc 100644 --- a/hw/core/cpu.c +++ b/hw/core/cpu.c @@ -367,7 +367,7 @@ static void cpu_common_initfn(Object *obj) cpu->nr_cores = 1; cpu->nr_threads = 1; - qemu_mutex_init(&cpu->work_mutex); + qemu_mutex_init(&cpu->lock); QSIMPLEQ_INIT(&cpu->work_list); QTAILQ_INIT(&cpu->breakpoints); QTAILQ_INIT(&cpu->watchpoints); @@ -379,7 +379,7 @@ static void cpu_common_finalize(Object *obj) { CPUState *cpu = CPU(obj); - qemu_mutex_destroy(&cpu->work_mutex); + qemu_mutex_destroy(&cpu->lock); } static int64_t cpu_common_get_arch_id(CPUState *cpu) diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h index d78ff1d165..873bf23a39 100644 --- a/include/hw/core/cpu.h +++ b/include/hw/core/cpu.h @@ -331,7 +331,8 @@ struct qemu_work_item; * @opaque: User data. * @mem_io_pc: Host Program Counter at which the memory was accessed. * @kvm_fd: vCPU file descriptor for KVM. - * @work_mutex: Lock to prevent multiple access to @work_list. + * @lock: Lock to prevent multiple access to per-CPU fields. Must be acquired + * after the BQL. * @work_list: List of pending asynchronous work. * @trace_dstate_delayed: Delayed changes to trace_dstate (includes all changes * to @trace_dstate). @@ -375,7 +376,8 @@ struct CPUState { uint64_t random_seed; sigjmp_buf jmp_env; - QemuMutex work_mutex; + QemuMutex lock; + /* fields below protected by @lock */ QSIMPLEQ_HEAD(, qemu_work_item) work_list; CPUAddressSpace *cpu_ases;