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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 09D9DC83F26 for ; Wed, 30 Jul 2025 14:11:41 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uh7U8-000466-3X; Wed, 30 Jul 2025 10:08:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uh667-0005dp-LE for qemu-devel@nongnu.org; Wed, 30 Jul 2025 08:39:59 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uh663-0006uG-Vm for qemu-devel@nongnu.org; Wed, 30 Jul 2025 08:39:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1753879190; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YXMLdRLh9YwCZzYtukXOYEZwJEsXhn/JEVu/46+KzWE=; b=AEgH6MGAFVOHekHxgRYOwDPU9GzCeMqE50gPC5CvVp9G/ZcZr3XYFds4/GQioLS713xVUS aJNvsK4IIP22VdE1L+uiv1p0Ci5EKUlTVNlrcLoR9x7SCsfFunbKkjnHLTE45EayVsVoVN q4SGE0awytPUsjR3RmN+f6LmUDOuc2I= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-617-tAbn67rtOTGUZ6tHA2NjaA-1; Wed, 30 Jul 2025 08:39:48 -0400 X-MC-Unique: tAbn67rtOTGUZ6tHA2NjaA-1 X-Mimecast-MFC-AGG-ID: tAbn67rtOTGUZ6tHA2NjaA_1753879187 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 8E15A180045C; Wed, 30 Jul 2025 12:39:47 +0000 (UTC) Received: from dell-r430-03.lab.eng.brq2.redhat.com (dell-r430-03.lab.eng.brq2.redhat.com [10.37.153.18]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 3DC2930001B1; Wed, 30 Jul 2025 12:39:44 +0000 (UTC) From: Igor Mammedov To: qemu-devel@nongnu.org Cc: pbonzini@redhat.com, peterx@redhat.com, mst@redhat.com, mtosatti@redhat.com, kraxel@redhat.com, peter.maydell@linaro.org Subject: [PATCH v2 3/6] hpet: switch to fain-grained device locking Date: Wed, 30 Jul 2025 14:39:31 +0200 Message-ID: <20250730123934.1787379-4-imammedo@redhat.com> In-Reply-To: <20250730123934.1787379-1-imammedo@redhat.com> References: <20250730123934.1787379-1-imammedo@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass client-ip=170.10.129.124; envelope-from=imammedo@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org as a step towards lock-less HPET counter read, use per device locking instead of BQL. Signed-off-by: Igor Mammedov --- hw/timer/hpet.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/hw/timer/hpet.c b/hw/timer/hpet.c index cb48cc151f..ab5aa59ae4 100644 --- a/hw/timer/hpet.c +++ b/hw/timer/hpet.c @@ -38,6 +38,7 @@ #include "hw/timer/i8254.h" #include "system/address-spaces.h" #include "qom/object.h" +#include "qemu/lockable.h" #include "trace.h" struct hpet_fw_config hpet_fw_cfg = {.count = UINT8_MAX}; @@ -69,6 +70,7 @@ struct HPETState { SysBusDevice parent_obj; /*< public >*/ + QemuMutex lock; MemoryRegion iomem; uint64_t hpet_offset; bool hpet_offset_saved; @@ -428,6 +430,7 @@ static uint64_t hpet_ram_read(void *opaque, hwaddr addr, trace_hpet_ram_read(addr); addr &= ~4; + QEMU_LOCK_GUARD(&s->lock); /*address range of all global regs*/ if (addr <= 0xff) { switch (addr) { @@ -482,6 +485,7 @@ static void hpet_ram_write(void *opaque, hwaddr addr, int len = MIN(size * 8, 64 - shift); uint64_t old_val, new_val, cleared; + QEMU_LOCK_GUARD(&s->lock); trace_hpet_ram_write(addr, value); addr &= ~4; @@ -679,8 +683,10 @@ static void hpet_init(Object *obj) SysBusDevice *sbd = SYS_BUS_DEVICE(obj); HPETState *s = HPET(obj); + qemu_mutex_init(&s->lock); /* HPET Area */ memory_region_init_io(&s->iomem, obj, &hpet_ram_ops, s, "hpet", HPET_LEN); + memory_region_enable_lockless_io(&s->iomem); sysbus_init_mmio(sbd, &s->iomem); } -- 2.47.1