From patchwork Wed May 18 13:19:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 574099 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1FB53C433EF for ; Wed, 18 May 2022 13:19:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237655AbiERNTo (ORCPT ); Wed, 18 May 2022 09:19:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47178 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237637AbiERNTn (ORCPT ); Wed, 18 May 2022 09:19:43 -0400 Received: from mail-pl1-x62a.google.com (mail-pl1-x62a.google.com [IPv6:2607:f8b0:4864:20::62a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF2181312A4 for ; Wed, 18 May 2022 06:19:41 -0700 (PDT) Received: by mail-pl1-x62a.google.com with SMTP id n18so1742357plg.5 for ; Wed, 18 May 2022 06:19:41 -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=o0m2cct6gQ1hTU8zWjrJlY1/CzYGMV6aIaj43pzMyHQ=; b=umKomzNTnxFS6bZsoFa6ppQZeJt+zfPQytLmumJLs/djqxC49M3mmhYlkyQQngnwyn f1UHtTKAviySFJOH931vQd8f+sqmaiLm8zbbFf1ZLLmttwg3ObFbmIqJ7HIMqJjFGz4f 3rOvpAe0Ronm9jj6M3flcWOBpwZEADpP0FEqTM+Y0t6KPDDOOBOdv+j+ws6PZ90SqxIm DhxCFoOvjQgLF0ogB25DjAAQFJqKKnMGUpP8YOfNT5CTYvpH1Rf0StUfMOv68SLfNdEa i+1skS1vRbokch1jy3ZPMODZR39KIkDj2C8+cwijleR7EaNKoNQehKCijXPLBkgmKI1h vENA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=o0m2cct6gQ1hTU8zWjrJlY1/CzYGMV6aIaj43pzMyHQ=; b=oMYLJPaDhhExftuBng5h4h5qUmz2hjiWGH/0M32T5dddhz9HtGTRYUnTjO/tzwKlxw MwYqGAacxAmkRWQiBnKDtZjLACpQkbjf6316NrnsjdVhX/bry37dyptHZXt5IchbFvAj x4N2WsTqxGqM2wTzFeiQm9VxMgxR1t9+KzzGnDcRSK2VOvPwQb5Rrwh4qtgMz8O1sYiy CMikvo6Lqj0omcbYzf/66qc0jrHYHcD8VTeOTW4u0cdzkhq07BbJi4MlRvHTVw93i/fW QAXv78d9TlTFMpsn0nQrDrZAcHHdqHwc6DKUm7IclGNz0QHIDS03NxdIJu3K8E3ku+tR dI5A== X-Gm-Message-State: AOAM530XaY/6d/tKTr86WeuZ1gzHEuoShkyQDML7hhcADUgZWst2KDt3 p/nVhBZRBVPsuUlNT3RL51/B X-Google-Smtp-Source: ABdhPJyHDXnFThSQ2XZkBGm0ehgt4AjaSs5P8n90+AxqDFvzx/b9+gdrukWw65K8iRuiJeeg7pXjng== X-Received: by 2002:a17:902:cec9:b0:161:a107:d30a with SMTP id d9-20020a170902cec900b00161a107d30amr9115101plg.105.1652879981149; Wed, 18 May 2022 06:19:41 -0700 (PDT) Received: from localhost.localdomain ([117.217.181.192]) by smtp.gmail.com with ESMTPSA id b5-20020a170903228500b0015e8d4eb27esm1663908plh.200.2022.05.18.06.19.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 May 2022 06:19:40 -0700 (PDT) From: Manivannan Sadhasivam To: bhelgaas@google.com, lorenzo.pieralisi@arm.com, kbusch@kernel.org, hch@lst.de Cc: linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, svarbanov@mm-sol.com, bjorn.andersson@linaro.org, axboe@fb.com, quic_vbadigan@quicinc.com, quic_krichai@quicinc.com, quic_nitirawa@quicinc.com, vidyas@nvidia.com, sagi@grimberg.me, linux-pm@vger.kernel.org, rafael@kernel.org, Manivannan Sadhasivam Subject: [PATCH v2 1/3] PCI: Add a flag to notify PCI drivers about powerdown during suspend Date: Wed, 18 May 2022 18:49:11 +0530 Message-Id: <20220518131913.26974-2-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220518131913.26974-1-manivannan.sadhasivam@linaro.org> References: <20220518131913.26974-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On some systems like Chromebooks based on Qcom SC7280, the PCIe RC driver or a hardware entity like RPMh may powerdown all PCIe devices during system suspend for aggressive powersaving. In that case, the PCI host controller drivers need to notify the PCI device drivers that the power will be taken off during system suspend so that the drivers can prepare the devices accordingly. One prime example is the PCI NVMe driver. This flag can be used by the driver to shutdown the NVMe device during suspend and recover it during resume. Signed-off-by: Manivannan Sadhasivam --- Changes in v2: * Changed the comment for the flag to mention the usecase. * Reworded the commit message to convey how the poweroff happens include/linux/pci.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/pci.h b/include/linux/pci.h index 60adf42460ab..3e3a1c4f4559 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -578,6 +578,8 @@ struct pci_host_bridge { unsigned int preserve_config:1; /* Preserve FW resource setup */ unsigned int size_windows:1; /* Enable root bus sizing */ unsigned int msi_domain:1; /* Bridge wants MSI domain */ + unsigned int suspend_poweroff:1; /* Some platforms like Qcom SC7280 may poweroff + devices during system suspend for power saving */ /* Resource alignment requirements */ resource_size_t (*align_resource)(struct pci_dev *dev,