From nobody Mon Feb 9 16:34:26 2026 Received: from szxga05-in.huawei.com (szxga05-in.huawei.com [45.249.212.191]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EB8886DD1D for ; Tue, 2 Apr 2024 11:42:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.191 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712058135; cv=none; b=TNx4Vqp27H/DU+cgrrhw+xKY86+maWzEk/vucSH8gfLVAzy174GV0reNDnjHmXIyQvpNr2OguTblwO1iGOdHgeOr3POMEJGqwlPqnfxhew5dHu/fdgrfGGhL1ePWL/zXxJZaFbAtdRYlc3nu3SYuqxkR88+SA4qEOSw2EGoSNJc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712058135; c=relaxed/simple; bh=Ido695F/P70jWK7SlR0yJrevOUkVgDQOpjJYH7Ow7NA=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=DAtaL5oecJTHuafVTuXO+waGJ7DtGmBecw0f4cHEHp2TM1aCsk1dTMOcd0AGUP+5EsUhxx4jdrkVgglThtJYLN+lzBI/efd1X6VKaXFXS8Y/mUSEmBlD1SBmX2SC9EsT7oHdxAc4+R3XDPUH9LoUv0qJ5ZG6wnJNgdo3jsgFvNE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.191 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.163.44]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4V85WW56tpz1h2SR; Tue, 2 Apr 2024 19:39:19 +0800 (CST) Received: from kwepemd500014.china.huawei.com (unknown [7.221.188.63]) by mail.maildlp.com (Postfix) with ESMTPS id 641441403D5; Tue, 2 Apr 2024 19:42:04 +0800 (CST) Received: from 228-1616.huawei.com (10.67.246.68) by kwepemd500014.china.huawei.com (7.221.188.63) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.28; Tue, 2 Apr 2024 19:42:03 +0800 From: t00849498 To: , , , CC: , , Subject: [PATCH] irqchip/gic-v3-its: Don't need VSYNC if VMAPP with {V, Alloc}=={0, x} Date: Tue, 2 Apr 2024 11:41:47 +0000 Message-ID: <20240402114147.3788881-1-tangnianyao@huawei.com> X-Mailer: git-send-email 2.30.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To kwepemd500014.china.huawei.com (7.221.188.63) Content-Type: text/plain; charset="utf-8" From GIC spec, a VMAPP with {V, Alloc}=3D=3D{0, x} is self-synchronizing, This means the ITS command queue does not show the command as consumed until all of its effects are completed. A VSYNC with unmapped vpeid is not needed. Signed-off-by: t00849498 --- drivers/irqchip/irq-gic-v3-its.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-= its.c index fca888b36680..a0ca5dcbb245 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -789,6 +789,7 @@ static struct its_vpe *its_build_vmapp_cmd(struct its_n= ode *its, unsigned long vpt_addr, vconf_addr; u64 target; bool alloc; + bool unmap_v4_1 =3D !desc->its_vmapp_cmd.valid && is_v4_1(its); =20 its_encode_cmd(cmd, GITS_CMD_VMAPP); its_encode_vpeid(cmd, desc->its_vmapp_cmd.vpe->vpe_id); @@ -832,6 +833,9 @@ static struct its_vpe *its_build_vmapp_cmd(struct its_n= ode *its, out: its_fixup_cmd(cmd); =20 + if (unmap_v4_1) + return NULL; + return valid_vpe(its, desc->its_vmapp_cmd.vpe); } =20 --=20 2.30.0