From patchwork Fri May 13 11:00:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 12848652 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 14E79C433EF for ; Fri, 13 May 2022 11:01:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379634AbiEMLBB (ORCPT ); Fri, 13 May 2022 07:01:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34550 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379651AbiEMLA5 (ORCPT ); Fri, 13 May 2022 07:00:57 -0400 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2CDE11C919 for ; Fri, 13 May 2022 04:00:55 -0700 (PDT) Received: by mail-pl1-x636.google.com with SMTP id d17so7632952plg.0 for ; Fri, 13 May 2022 04:00:55 -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=uGswQ0aP97Suern/pqvhLGTEOIpF5J5h2MoXW5LuuBU=; b=ZF7r2l+HwxQm5PA8mve2cF+rBwKjnM+0fSfGGdoNA3T0LJdycXkCGWLrykpa8sL/oD 08lIP8dZt0wAe2tK+75oTRz1risNDIOCOSiRaW+GZokpCuhe+9MrL2YynteMMnYHDR3H ItIDcdINQ82V0AG+st+raJapxxBHOih2yAPagaFk64puhsJ/iztuWI2Rf4eKJ19ZFuSX YL/pLIatMsl2o8QBgjy0eNGResBVvt2NP3Y80kDYZiv7AA+gsRPYm0wGgSd7CPa4mYRN F4q7pPFCxNNeVHCsbD+3J+hjPwmsRQyClY9uud0L4zXlaFzZ+hz0uXVv3kgKtKaDXw60 Pa+Q== 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=uGswQ0aP97Suern/pqvhLGTEOIpF5J5h2MoXW5LuuBU=; b=y8bwBjcIJfBa9s7w7ojxhWdk7jDcNh7kj6CqOPo9IcJXa1ju05T8pv2ov63S4t+hml Lcq4wEbdkhK199vRpYS2UQkhuofnBjWEhIyNY4+06hgdtYElxfucUz1Bt6NngtQsaTKQ AZd5YYdZ3jONQ4v4I3UbxNW/z2tRSlaDAJT7mBd4qR1V2uRQSlJsbX+5LNvGzeBA2G7N cNM++KDPSJ9KguPwc9RcV3z3Gbg8m1hL44CvP3En38GxdqpMZ1HC7Pe1kELKeCIRdunf 1ThFM+2jpQ/6Xcxz5k4E4AvkBY2bQzc8Q0btZ3jO+b0ebIWqxeODCw84lHZH5emJNrJo jwQQ== X-Gm-Message-State: AOAM532wQi0rUtWushK0ab9dDVe7LPOu8Ba2lK7/o6x8Js6Es61Kfn/9 mmFp/Ff0wh0/4Osr3mJihrNC X-Google-Smtp-Source: ABdhPJyTPQtQvf4t/ey8cvG54O7pCIiYbK85D35VbK5tYExzPBijKVc7qymid6BgehggfTgPgOcVnw== X-Received: by 2002:a17:902:7586:b0:15e:c2fe:bad0 with SMTP id j6-20020a170902758600b0015ec2febad0mr3948667pll.72.1652439654573; Fri, 13 May 2022 04:00:54 -0700 (PDT) Received: from localhost.localdomain ([117.202.184.202]) by smtp.gmail.com with ESMTPSA id u36-20020a631424000000b003db0f2d135esm1322120pgl.49.2022.05.13.04.00.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 13 May 2022 04:00:54 -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, Manivannan Sadhasivam Subject: [PATCH 1/3] PCI: Add a flag to notify PCI drivers about powerdown during suspend Date: Fri, 13 May 2022 16:30:25 +0530 Message-Id: <20220513110027.31015-2-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220513110027.31015-1-manivannan.sadhasivam@linaro.org> References: <20220513110027.31015-1-manivannan.sadhasivam@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On some systems like Chromebooks based on Qcom chipsets, the OS 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 --- include/linux/pci.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/pci.h b/include/linux/pci.h index 60adf42460ab..069caf1fe88d 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -578,6 +578,7 @@ 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; /* OS may poweroff devices during system suspend */ /* Resource alignment requirements */ resource_size_t (*align_resource)(struct pci_dev *dev,