From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from canpmsgout08.his.huawei.com (canpmsgout08.his.huawei.com [113.46.200.223]) (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 4570452FE2F for ; Tue, 8 Sep 2026 11:57:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=113.46.200.223 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788868664; cv=none; b=uAv4P7RwRt/nIOq6gFLSelCLC3A+uKT0JNrN32O2bYF8TnV2jl4k983Dq1XGcPvPv8aVG0jUeXl9v3lt4+QH3U0SD2rqz5kv/oty9T4z5xIiDuD/0jE17a1UzejmHublHSX4I4IO7OBNSrrYAASsp7c9XlEPwtpj/zd1VMvA4v4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788868664; c=relaxed/simple; bh=83tDqTJL5pxQy2kKwGR2dTt8aQYFClW/zbZE+4PfQ9w=; h=Message-ID:Date:MIME-Version:Subject:To:CC:References:From: In-Reply-To:Content-Type; b=fKE2BxQyHDJqtIoyP/JIa4xCcCiq4tME8/dMRVV3cDbrTCTrwtpMa7jpsBru0FI+QPuMrPeLmcoj/5iKgH8DpC+KFDAQP6rNc5bjG1m4nqiQKes0i+rInoM3tuWAz7pzSKwbSzSNt3vpBhKHqC5+7cV7YKnnWDc7JtKdAX7rZnE= 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; dkim=pass (1024-bit key) header.d=huawei.com header.i=@huawei.com header.b=lGXJG+z+; arc=none smtp.client-ip=113.46.200.223 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 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=huawei.com header.i=@huawei.com header.b="lGXJG+z+" dkim-signature: v=1; a=rsa-sha256; d=huawei.com; s=dkim; c=relaxed/relaxed; q=dns/txt; h=From; bh=gc43alueHNjQq0WXaXpIZol5pNQHnDbpHeJQ0elMPno=; b=lGXJG+z+qP/9knI6Q1Chyv/DIPLN4L+ZycdyfPWLPkNPDqokYAfbRHAPv0PH8mAh9qQqRlQ6a EcZbJC/Ur7G6AzVCrYdQObqHEsB/X8bMHp0IatNh5GYe0WcpJeKxDdJb4sSCnCEnPCTZ6KSrzP9 Ie7+hNJ9ovEbtSJ2Tp+CGdo= Received: from mail.maildlp.com (unknown [172.19.163.15]) by canpmsgout08.his.huawei.com (SkyGuard) with ESMTPS id 4hfMbk6sWlzmV8f; Tue, 8 Sep 2026 19:46:42 +0800 (CST) Received: from kwepemk200008.china.huawei.com (unknown [7.202.194.74]) by mail.maildlp.com (Postfix) with ESMTPS id E137640586; Tue, 8 Sep 2026 19:57:36 +0800 (CST) Received: from [10.67.109.254] (10.67.109.254) by kwepemk200008.china.huawei.com (7.202.194.74) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.45; Tue, 8 Sep 2026 19:57:36 +0800 Message-ID: <1f63a6fd-6e09-47a3-96cb-236eeebf8c20@huawei.com> Date: Tue, 8 Sep 2026 19:57:35 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 14/19] firmware/psci: Cache PSCI v0.2+ version number to avoid redundant SMCs To: Will Deacon , CC: , Thomas Gleixner , Catalin Marinas , Borislav Petkov , Lorenzo Pieralisi , Mark Rutland , David Woodhouse , Peter Zijlstra , Marc Zyngier References: <20260907164024.17164-1-will@kernel.org> <20260907164024.17164-15-will@kernel.org> From: Jinjie Ruan In-Reply-To: <20260907164024.17164-15-will@kernel.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: kwepems100001.china.huawei.com (7.221.188.238) To kwepemk200008.china.huawei.com (7.202.194.74) 在 2026/9/8 0:40, Will Deacon 写道: > Secure monitor calls to EL3 aren't necessarily cheap, so cache the > PSCI version number in memory to avoid asking firmware the same question > over and over again. > > Signed-off-by: Will Deacon > --- > drivers/firmware/psci/psci.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c > index e73bae6cb23a..8bb3f7c37678 100644 > --- a/drivers/firmware/psci/psci.c > +++ b/drivers/firmware/psci/psci.c > @@ -155,7 +155,12 @@ static u32 psci_0_1_get_version(void) > > static u32 psci_0_2_get_version(void) > { > - return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0); > + static u32 version; > + > + if (unlikely(!version)) > + version = invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0); > + > + return version; Reviewed-by: Jinjie Ruan > } > > int psci_set_osi_mode(bool enable)