From patchwork Thu May 21 16:40:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Robert Foley X-Patchwork-Id: 1295429 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=U+GT93lC; 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 49Sbsn3Gpdz9sPF for ; Fri, 22 May 2020 03:17:49 +1000 (AEST) Received: from localhost ([::1]:33518 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jbopH-00067Z-5z for incoming@patchwork.ozlabs.org; Thu, 21 May 2020 13:17:47 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50192) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jboJG-0004Vu-9A for qemu-devel@nongnu.org; Thu, 21 May 2020 12:44:42 -0400 Received: from mail-qk1-x741.google.com ([2607:f8b0:4864:20::741]:34331) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jboJF-0006ke-98 for qemu-devel@nongnu.org; Thu, 21 May 2020 12:44:41 -0400 Received: by mail-qk1-x741.google.com with SMTP id 190so7918081qki.1 for ; Thu, 21 May 2020 09:44:39 -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=f6jTs4l1FUMMcryMnS/4lJD5Ni20LOW4nBzyszoy3L4=; b=U+GT93lCYq8RuQBsNpW0FvQNeYBg/ZDm0UBcKUlTv6NGzMx5QowNjosWOW4Hh6fFBR o5qDdlykIEaKgxcHDCZrh0HJ16sSegni6A1tRjV5ajlB8OSq/P9VYMlC97qb/fqIg3of S0nXOoxsvgybjD9x4aHyL8bpD+6ECZ+AiciwPI+wF3l4jMmaNOVjkZIKKXOMOCvo7pMC wD/EOQIucPF0VtHzaL9kiB1ZcSUCpn5DVo/M0XlXjCjoUXRSOay/HD30DSnsGFQmSGkv UsihxjAu/dVejODKWx423p61s7tP4sKGJCz6oVCbzwZ3QkmTiXLwaMlKsr/dPAdTR3lu uBwQ== 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=f6jTs4l1FUMMcryMnS/4lJD5Ni20LOW4nBzyszoy3L4=; b=WBvvlwrGDB1Gx8EyMZzJkjDUmReYOXutqoCGeTSsUhU+HeOqsiPh5/rapK/2dnY+Si YQebIMUPPhF+7cqAUj3S8A5xmQ7oLWQUKnHqZoCZHHNp2rGtsiLZOMmgMSLBfndV9IAG /F+Z7kJPnuLgy1MWxPD00nx4O3KYYrWaVijlW8POLuYyy57tTBXPDHqkqjqnVWH9mFxn VXp/Etoerx9pRbgZ0g3dRKWtp7MvvwPegym5QpTg6J4SnFNPQG2aLkDgd7SmEdil37r/ C7Y+WwLQprlW5wFlMS6hyncVC1cKLeYMYZuGmTTomvuQmk8VUJGA+tENA2aWS2sHxnM6 puOA== X-Gm-Message-State: AOAM533NlcToEzmcSqsNOJ8dnl3GbfsBQOTbkUa3CzsMmiGKgQREb5fb +Npf5Ss+qhi8NOOKorv4oPR2EOs5d4J/NQ== X-Google-Smtp-Source: ABdhPJzs90Pwp95Q4YWsVV7Q0rqm4Bp7Xbmm0LmluS7V13wMY2eWTxpv/A7YYTYSJEJaQQV1CfDbRg== X-Received: by 2002:a05:620a:a83:: with SMTP id v3mr10997896qkg.84.1590079478970; Thu, 21 May 2020 09:44:38 -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.57.2020.05.21.09.44.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 May 2020 09:44:38 -0700 (PDT) From: Robert Foley To: qemu-devel@nongnu.org Subject: [PATCH v9 63/74] cpu: introduce cpu_has_work_with_iothread_lock Date: Thu, 21 May 2020 12:40:00 -0400 Message-Id: <20200521164011.638-64-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::741; envelope-from=robert.foley@linaro.org; helo=mail-qk1-x741.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" It will gain some users soon. Suggested-by: Paolo Bonzini Reviewed-by: Richard Henderson Reviewed-by: Alex Bennée Signed-off-by: Emilio G. Cota Signed-off-by: Robert Foley --- include/hw/core/cpu.h | 37 ++++++++++++++++++++++++++++++++++--- 1 file changed, 34 insertions(+), 3 deletions(-) diff --git a/include/hw/core/cpu.h b/include/hw/core/cpu.h index 7bf7700630..9766477e62 100644 --- a/include/hw/core/cpu.h +++ b/include/hw/core/cpu.h @@ -26,6 +26,7 @@ #include "exec/memattrs.h" #include "qapi/qapi-types-run-state.h" #include "qemu/bitmap.h" +#include "qemu/main-loop.h" #include "qemu/rcu_queue.h" #include "qemu/queue.h" #include "qemu/thread.h" @@ -82,6 +83,8 @@ struct TranslationBlock; * @reset_dump_flags: #CPUDumpFlags to use for reset logging. * @has_work: Callback for checking if there is work to do. Called with the * CPU lock held. + * @has_work_with_iothread_lock: Callback for checking if there is work to do. + * Called with both the BQL and the CPU lock held. * @do_interrupt: Callback for interrupt handling. * @do_unaligned_access: Callback for unaligned access handling, if * the target defines #TARGET_ALIGNED_ONLY. @@ -167,6 +170,7 @@ typedef struct CPUClass { int reset_dump_flags; bool (*has_work)(CPUState *cpu); + bool (*has_work_with_iothread_lock)(CPUState *cpu); void (*do_interrupt)(CPUState *cpu); void (*do_unaligned_access)(CPUState *cpu, vaddr addr, MMUAccessType access_type, @@ -800,14 +804,41 @@ const char *parse_cpu_option(const char *cpu_option); static inline bool cpu_has_work(CPUState *cpu) { CPUClass *cc = CPU_GET_CLASS(cpu); + bool has_cpu_lock = cpu_mutex_locked(cpu); + bool (*func)(CPUState *cpu); bool ret; + /* some targets require us to hold the BQL when checking for work */ + if (cc->has_work_with_iothread_lock) { + if (qemu_mutex_iothread_locked()) { + func = cc->has_work_with_iothread_lock; + goto call_func; + } + + if (has_cpu_lock) { + /* avoid deadlock by acquiring the locks in order */ + cpu_mutex_unlock(cpu); + } + qemu_mutex_lock_iothread(); + cpu_mutex_lock(cpu); + + ret = cc->has_work_with_iothread_lock(cpu); + + qemu_mutex_unlock_iothread(); + if (!has_cpu_lock) { + cpu_mutex_unlock(cpu); + } + return ret; + } + g_assert(cc->has_work); - if (cpu_mutex_locked(cpu)) { - return cc->has_work(cpu); + func = cc->has_work; + call_func: + if (has_cpu_lock) { + return func(cpu); } cpu_mutex_lock(cpu); - ret = cc->has_work(cpu); + ret = func(cpu); cpu_mutex_unlock(cpu); return ret; }