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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 138CCC433DF for ; Tue, 19 May 2020 17:10:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EFD9120709 for ; Tue, 19 May 2020 17:10:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729197AbgESRK5 (ORCPT ); Tue, 19 May 2020 13:10:57 -0400 Received: from mga06.intel.com ([134.134.136.31]:52187 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729001AbgESRK5 (ORCPT ); Tue, 19 May 2020 13:10:57 -0400 IronPort-SDR: mUdAwHwjaLqzVHZvw2xYplJCqd4YFkaQJFZJoEiJLoxkQd/1UTfAk50jEODfJCKf/iPmaNJGC0 k43Gg1CoxXeA== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 May 2020 10:10:56 -0700 IronPort-SDR: YEfPeTPLf3xKET0vqRozbESjJnBS3MFTOVE2oJhdp6jdCl/X6iv5Zo3fjjH1ObYkx3Y+d4KkDk 1MFbd3hx6BeA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,410,1583222400"; d="scan'208";a="343201225" Received: from linux.intel.com ([10.54.29.200]) by orsmga001.jf.intel.com with ESMTP; 19 May 2020 10:10:55 -0700 Received: from debox1-desk1.jf.intel.com (debox1-desk1.jf.intel.com [10.7.201.137]) by linux.intel.com (Postfix) with ESMTP id 0C8375803C5; Tue, 19 May 2020 10:10:54 -0700 (PDT) Message-ID: <8003f408ec9bcf0ea2522122ba4051ffb571e1b7.camel@linux.intel.com> Subject: Re: [PATCH 1/2] pci: Add ACPI StorageD3Enable _DSD support From: "David E. Box" Reply-To: david.e.box@linux.intel.com To: "Rafael J. Wysocki" Cc: lenb@kernel.org, bhelgaas@google.com, kbusch@kernel.org, axboe@fb.com, hch@lst.de, sagi@grimberg.me, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, Dan Williams Date: Tue, 19 May 2020 10:10:53 -0700 In-Reply-To: <1967525.XL736rHnAO@kreacher> References: <20200428003214.3764-1-david.e.box@linux.intel.com> <20200428003214.3764-2-david.e.box@linux.intel.com> <1967525.XL736rHnAO@kreacher> Organization: David E. Box Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.34.3 (3.34.3-1.fc31) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org On Mon, 2020-05-18 at 14:34 +0200, Rafael J. Wysocki wrote: > On Tuesday, April 28, 2020 2:32:13 AM CEST David E. Box wrote: > > NVMe storage power management during suspend-to-idle, particularly > > on > > laptops, has been inconsistent with some devices working with D3 > > while > > others must rely on NVMe APST in order for power savings to be > > realized. > > Currently the default is to use APST unless quirked to do > > otherwise. > > However newer platforms, like Intel Comet Lake systems, may require > > NVMe > > drives to use D3 in order for the PCIe ports to be properly power > > managed. > > To make it easier for drivers to choose, these platforms may supply > > a > > special "StorageD3Enable" _DSD property under the root port that > > the device > > is attached to. If supplied, the driver must use D3 in order for > > the > > platform to realize the deepest power savings in suspend-to-idle. > > > > Adds support for the _DSD to the pci/acpi layer. > > > > Acked-by: Dan Williams > > Link: > > https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/power-management-for-storage-hardware-devices-intro > > Signed-off-by: David E. Box > > --- > > drivers/acpi/property.c | 3 +++ > > drivers/pci/pci-acpi.c | 47 > > +++++++++++++++++++++++++++++++++++++++++ > > drivers/pci/pci.c | 6 ++++++ > > drivers/pci/pci.h | 4 ++++ > > include/linux/pci.h | 1 + > > 5 files changed, 61 insertions(+) > > > > diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c > > index e601c4511a8b..f09375ab40e4 100644 > > --- a/drivers/acpi/property.c > > +++ b/drivers/acpi/property.c > > @@ -45,6 +45,9 @@ static const guid_t prp_guids[] = { > > /* Thunderbolt GUID for WAKE_SUPPORTED: 6c501103-c189-4296- > > ba72-9bf5a26ebe5d */ > > GUID_INIT(0x6c501103, 0xc189, 0x4296, > > 0xba, 0x72, 0x9b, 0xf5, 0xa2, 0x6e, 0xbe, 0x5d), > > + /* D3 Support for storage devivce: 5025030f-842f-4ab4-a561- > > 99a5189762d0 */ > > + GUID_INIT(0x5025030f, 0x842f, 0x4ab4, > > + 0xa5, 0x61, 0x99, 0xa5, 0x18, 0x97, 0x62, 0xd0), > > }; > > > > /* ACPI _DSD data subnodes GUID: dbb8e3e6-5886-4ba6-8795- > > 1319f52a966b */ > > diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c > > index d21969fba6ab..5df249ebf022 100644 > > --- a/drivers/pci/pci-acpi.c > > +++ b/drivers/pci/pci-acpi.c > > @@ -972,6 +972,52 @@ static bool acpi_pci_bridge_d3(struct pci_dev > > *dev) > > return val == 1; > > } > > > > +static bool acpi_pci_storage_d3(struct pci_dev *dev) > > +{ > > + const struct fwnode_handle *fwnode; > > + struct acpi_device *adev; > > + struct pci_dev *root; > > + acpi_handle handle; > > + acpi_status status; > > + u8 val; > > + > > + /* > > + * Look for _DSD property specifying that the storage device on > > + * the port must use D3 to support deep platform power savings > > during > > + * suspend-to-idle > > + */ > > + root = pci_find_pcie_root_port(dev); > > + if (!root) > > + return false; > > + > > + adev = ACPI_COMPANION(&root->dev); > > + if (root == dev) { > > + /* > > + * It is possible that the ACPI companion is not yet > > bound > > + * for the root port so look it up manually here. > > + */ > > + if (!adev && !pci_dev_is_added(root)) > > + adev = acpi_pci_find_companion(&root->dev); > > + } > > + > > + if (!adev) > > + return false; > > + > > + status = acpi_get_handle(adev->handle, "PXSX", &handle); > > + if (ACPI_FAILURE(status)) > > + return false; > > + > > + adev = acpi_bus_get_acpi_device(handle); > > + if (!adev) > > + return false; > > + > > + fwnode = acpi_fwnode_handle(adev); > > + if (!fwnode_property_read_u8(fwnode, "StorageD3Enable", &val)) > > + return val == 1; > > + > > + return false; > > +} > > Kind of orthogonal to what happens to the second patch in this > series, I don't > think that the PCI changes below are all needed. > > IMO it would be sufficient to export the function above, maybe as > pci_acpi_storage_d3(), to drivers, so that they can call it directly > as > desired. > > Since _DSD return data are not allowed by the spec to change between > subsequent invocations of it, the interested driver may call this > function > once at the device init time and quirk it accordingly if needed. Yeah this is better. Will do. Thanks. 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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AC6EFC433E0 for ; Tue, 19 May 2020 17:11:18 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7F4E020709 for ; Tue, 19 May 2020 17:11:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="JK8sGUtt" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7F4E020709 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:Reply-To:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:MIME-Version:References: In-Reply-To:Date:To:From:Subject:Message-ID:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=qq1gyiFiP7fOdAkAsrCFaiqXgrl4Q53akhPf+oW5rg0=; b=JK8sGUttOdOJ4l a8TEI9LmoNgqlqEg8pTq8TYRcuPDoESPVF9ciLPy0ghh8pof1m5CEAVWnxYRfa/u+mzutdgyUy8Fh DwLSDSFzJhI3sVwinCW6GDs5K/jtSP1c4uqoe7jVBOJPABis9tlGLnVRFWGBzGY+hCnhaVCbxo8xa 9FzI+vHC8jXwp6uNcdGM1iWQj0Gh7p33d0p6j9fSE0a5k2YYjWDnCyD0gk46qgj+TUpQy7Wm5kHRB T8eCHCwJZUGiDw8/Mwqa32zUxU+CEaobH6uPTvDk8lnPHdwY6mkiJ2L6jt220PP5s2AlN9pLcEtcN bAlZCRPDqcrzCuUBnP2g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jb5lr-0002Kf-47; Tue, 19 May 2020 17:11:15 +0000 Received: from mga12.intel.com ([192.55.52.136]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jb5ln-0002K2-Fb for linux-nvme@lists.infradead.org; Tue, 19 May 2020 17:11:13 +0000 IronPort-SDR: MY8FXFmnGPLDXW6CoMSCTisP2/bL6bxvHGvP47AMskHZpYS3Q533fk+ZAOBYIpTe5fj8l33faP OBljIgv++7Uw== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 May 2020 10:10:56 -0700 IronPort-SDR: YEfPeTPLf3xKET0vqRozbESjJnBS3MFTOVE2oJhdp6jdCl/X6iv5Zo3fjjH1ObYkx3Y+d4KkDk 1MFbd3hx6BeA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,410,1583222400"; d="scan'208";a="343201225" Received: from linux.intel.com ([10.54.29.200]) by orsmga001.jf.intel.com with ESMTP; 19 May 2020 10:10:55 -0700 Received: from debox1-desk1.jf.intel.com (debox1-desk1.jf.intel.com [10.7.201.137]) by linux.intel.com (Postfix) with ESMTP id 0C8375803C5; Tue, 19 May 2020 10:10:54 -0700 (PDT) Message-ID: <8003f408ec9bcf0ea2522122ba4051ffb571e1b7.camel@linux.intel.com> Subject: Re: [PATCH 1/2] pci: Add ACPI StorageD3Enable _DSD support From: "David E. Box" To: "Rafael J. Wysocki" Date: Tue, 19 May 2020 10:10:53 -0700 In-Reply-To: <1967525.XL736rHnAO@kreacher> References: <20200428003214.3764-1-david.e.box@linux.intel.com> <20200428003214.3764-2-david.e.box@linux.intel.com> <1967525.XL736rHnAO@kreacher> Organization: David E. Box User-Agent: Evolution 3.34.3 (3.34.3-1.fc31) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200519_101111_540455_F3C55AC5 X-CRM114-Status: GOOD ( 28.09 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: david.e.box@linux.intel.com Cc: sagi@grimberg.me, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, axboe@fb.com, kbusch@kernel.org, bhelgaas@google.com, Dan Williams , hch@lst.de, lenb@kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Mon, 2020-05-18 at 14:34 +0200, Rafael J. Wysocki wrote: > On Tuesday, April 28, 2020 2:32:13 AM CEST David E. Box wrote: > > NVMe storage power management during suspend-to-idle, particularly > > on > > laptops, has been inconsistent with some devices working with D3 > > while > > others must rely on NVMe APST in order for power savings to be > > realized. > > Currently the default is to use APST unless quirked to do > > otherwise. > > However newer platforms, like Intel Comet Lake systems, may require > > NVMe > > drives to use D3 in order for the PCIe ports to be properly power > > managed. > > To make it easier for drivers to choose, these platforms may supply > > a > > special "StorageD3Enable" _DSD property under the root port that > > the device > > is attached to. If supplied, the driver must use D3 in order for > > the > > platform to realize the deepest power savings in suspend-to-idle. > > > > Adds support for the _DSD to the pci/acpi layer. > > > > Acked-by: Dan Williams > > Link: > > https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/power-management-for-storage-hardware-devices-intro > > Signed-off-by: David E. Box > > --- > > drivers/acpi/property.c | 3 +++ > > drivers/pci/pci-acpi.c | 47 > > +++++++++++++++++++++++++++++++++++++++++ > > drivers/pci/pci.c | 6 ++++++ > > drivers/pci/pci.h | 4 ++++ > > include/linux/pci.h | 1 + > > 5 files changed, 61 insertions(+) > > > > diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c > > index e601c4511a8b..f09375ab40e4 100644 > > --- a/drivers/acpi/property.c > > +++ b/drivers/acpi/property.c > > @@ -45,6 +45,9 @@ static const guid_t prp_guids[] = { > > /* Thunderbolt GUID for WAKE_SUPPORTED: 6c501103-c189-4296- > > ba72-9bf5a26ebe5d */ > > GUID_INIT(0x6c501103, 0xc189, 0x4296, > > 0xba, 0x72, 0x9b, 0xf5, 0xa2, 0x6e, 0xbe, 0x5d), > > + /* D3 Support for storage devivce: 5025030f-842f-4ab4-a561- > > 99a5189762d0 */ > > + GUID_INIT(0x5025030f, 0x842f, 0x4ab4, > > + 0xa5, 0x61, 0x99, 0xa5, 0x18, 0x97, 0x62, 0xd0), > > }; > > > > /* ACPI _DSD data subnodes GUID: dbb8e3e6-5886-4ba6-8795- > > 1319f52a966b */ > > diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c > > index d21969fba6ab..5df249ebf022 100644 > > --- a/drivers/pci/pci-acpi.c > > +++ b/drivers/pci/pci-acpi.c > > @@ -972,6 +972,52 @@ static bool acpi_pci_bridge_d3(struct pci_dev > > *dev) > > return val == 1; > > } > > > > +static bool acpi_pci_storage_d3(struct pci_dev *dev) > > +{ > > + const struct fwnode_handle *fwnode; > > + struct acpi_device *adev; > > + struct pci_dev *root; > > + acpi_handle handle; > > + acpi_status status; > > + u8 val; > > + > > + /* > > + * Look for _DSD property specifying that the storage device on > > + * the port must use D3 to support deep platform power savings > > during > > + * suspend-to-idle > > + */ > > + root = pci_find_pcie_root_port(dev); > > + if (!root) > > + return false; > > + > > + adev = ACPI_COMPANION(&root->dev); > > + if (root == dev) { > > + /* > > + * It is possible that the ACPI companion is not yet > > bound > > + * for the root port so look it up manually here. > > + */ > > + if (!adev && !pci_dev_is_added(root)) > > + adev = acpi_pci_find_companion(&root->dev); > > + } > > + > > + if (!adev) > > + return false; > > + > > + status = acpi_get_handle(adev->handle, "PXSX", &handle); > > + if (ACPI_FAILURE(status)) > > + return false; > > + > > + adev = acpi_bus_get_acpi_device(handle); > > + if (!adev) > > + return false; > > + > > + fwnode = acpi_fwnode_handle(adev); > > + if (!fwnode_property_read_u8(fwnode, "StorageD3Enable", &val)) > > + return val == 1; > > + > > + return false; > > +} > > Kind of orthogonal to what happens to the second patch in this > series, I don't > think that the PCI changes below are all needed. > > IMO it would be sufficient to export the function above, maybe as > pci_acpi_storage_d3(), to drivers, so that they can call it directly > as > desired. > > Since _DSD return data are not allowed by the spec to change between > subsequent invocations of it, the interested driver may call this > function > once at the device init time and quirk it accordingly if needed. Yeah this is better. Will do. Thanks. _______________________________________________ linux-nvme mailing list linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme