From patchwork Thu Apr 20 01:58:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 1770999 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=canonical.com header.i=@canonical.com header.a=rsa-sha256 header.s=20210705 header.b=krhyCaDJ; dkim-atps=neutral Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by legolas.ozlabs.org (Postfix) with ESMTP id 4Q217045f4z23hs for ; Thu, 20 Apr 2023 11:59:24 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231209AbjDTB7V (ORCPT ); Wed, 19 Apr 2023 21:59:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53918 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230081AbjDTB7V (ORCPT ); Wed, 19 Apr 2023 21:59:21 -0400 Received: from smtp-relay-canonical-1.canonical.com (smtp-relay-canonical-1.canonical.com [185.125.188.121]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C5895170A; Wed, 19 Apr 2023 18:59:19 -0700 (PDT) Received: from localhost.localdomain (unknown [10.101.196.174]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id 916A741ABE; Thu, 20 Apr 2023 01:59:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1681955958; bh=uRHcymisTbjiBf6eWzZPbcaSHTQevSe81zNyL32cDvU=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=krhyCaDJJrOGxSCNeq+hJJTpAxyQFFwUMA2ajAcje1eWMWOYGhKUx8gX0DFmexjgQ eu+Ev/aQ722WUrCSYAWPcJmMDQT2X4LivX+s29pQ3+B9iHmVTAOae+vSMdna+auxxk 8JoqAKfLAzo0U47lVkqVO4coAIC9iLP1+2tvGKhZzkiyEhsnzlGIAjeSQ1CsCBFIYZ 1RRzty+DF0uQxrcNatimBPx6ZOCbUxgjMSG2KmDV6w48G/C0zWLHRLkzwmHKsfidYl yCxpIPknuP76Kjy5xnZmJbIZ/tTNVMd1zzFvWTddHNCRdT0L22eFHwE+vpZPJ7ctkQ BTdaSqoDLunxw== From: Kai-Heng Feng To: bhelgaas@google.com Cc: mika.westerberg@linux.intel.com, koba.ko@canonical.com, sathyanarayanan.kuppuswamy@linux.intel.com, Kai-Heng Feng , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/4] PCI: Keep AER status in pci_restore_state() Date: Thu, 20 Apr 2023 09:58:27 +0800 Message-Id: <20230420015830.309845-1-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org When AER is using the same IRQ as PME, AER interrupt is treated as a wakeup event and it can disrupt system suspend process. If that happens, the system will report it's woken up by PME IRQ without indicating any AER error since AER status is cleared on resume. So keep the AER status so users can know the system is woken up by AER instead of PME. Signed-off-by: Kai-Heng Feng Reviewed-by: Mika Westerberg --- v2: - New patch. drivers/pci/pci.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 7a67611dc5f4..71aead00fc20 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1778,7 +1778,6 @@ void pci_restore_state(struct pci_dev *dev) pci_restore_dpc_state(dev); pci_restore_ptm_state(dev); - pci_aer_clear_status(dev); pci_restore_aer_state(dev); pci_restore_config_space(dev); From patchwork Thu Apr 20 01:58:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 1771000 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=canonical.com header.i=@canonical.com header.a=rsa-sha256 header.s=20210705 header.b=hgKzGosD; dkim-atps=neutral Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by legolas.ozlabs.org (Postfix) with ESMTP id 4Q217G3klJz23hs for ; Thu, 20 Apr 2023 11:59:38 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231478AbjDTB70 (ORCPT ); Wed, 19 Apr 2023 21:59:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53946 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230081AbjDTB7Y (ORCPT ); Wed, 19 Apr 2023 21:59:24 -0400 Received: from smtp-relay-canonical-1.canonical.com (smtp-relay-canonical-1.canonical.com [185.125.188.121]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8AAA030C8; Wed, 19 Apr 2023 18:59:23 -0700 (PDT) Received: from localhost.localdomain (unknown [10.101.196.174]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id 0BAE641EAA; Thu, 20 Apr 2023 01:59:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1681955962; bh=18fxRuTXUXBCZGjHQDK8n5GxW6CRAotRhBz1xm7lXP8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=hgKzGosDoQ+l+SxBBQSEIp3Y84gOuxy9mDwcnupbbcnr8+74Kfa/GsYlnC8oFbj/I 82C7bHnlkby6k5/NlOkjlr6Dc+GXdckGFYc5wAgtv+rCPl3hm2tdJiOvWSZ+PaR0n/ xpSBm2HJzFjKl362BADGO86rsOJcv3Xbc11MyRM8R8p6zwXLdeZNuR3bazqluFobOS 5p0QOmr51GVlfRbBJBliaLXEx8KEUB3bwEzZaDdIpBH0n/lrVlUX7ohMKCxdelf7jQ P9F6X3pHsl8FgGbcExjV4alT6LkKYkoK64BJmHxilkFRx3qu3h6eyWX/cU2k7OUfx9 5A0YsPKDZaDXw== From: Kai-Heng Feng To: bhelgaas@google.com Cc: mika.westerberg@linux.intel.com, koba.ko@canonical.com, sathyanarayanan.kuppuswamy@linux.intel.com, Kai-Heng Feng , Mahesh J Salgaonkar , "Oliver O'Halloran" , linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/4] PCI/AER: Factor out interrput toggling into helpers Date: Thu, 20 Apr 2023 09:58:28 +0800 Message-Id: <20230420015830.309845-2-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230420015830.309845-1-kai.heng.feng@canonical.com> References: <20230420015830.309845-1-kai.heng.feng@canonical.com> MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org There are many places that enable and disable AER interrput, so move them into helpers. Signed-off-by: Kai-Heng Feng --- v2: - New patch. drivers/pci/pcie/aer.c | 45 +++++++++++++++++++++++++----------------- 1 file changed, 27 insertions(+), 18 deletions(-) diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index f6c24ded134c..1420e1f27105 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -1227,6 +1227,28 @@ static irqreturn_t aer_irq(int irq, void *context) return IRQ_WAKE_THREAD; } +static void aer_enable_irq(struct pci_dev *pdev) +{ + int aer = pdev->aer_cap; + u32 reg32; + + /* Enable Root Port's interrupt in response to error messages */ + pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, ®32); + reg32 |= ROOT_PORT_INTR_ON_MESG_MASK; + pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32); +} + +static void aer_disable_irq(struct pci_dev *pdev) +{ + int aer = pdev->aer_cap; + u32 reg32; + + /* Disable Root's interrupt in response to error messages */ + pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, ®32); + reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK; + pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32); +} + /** * aer_enable_rootport - enable Root Port's interrupts when receiving messages * @rpc: pointer to a Root Port data structure @@ -1256,10 +1278,7 @@ static void aer_enable_rootport(struct aer_rpc *rpc) pci_read_config_dword(pdev, aer + PCI_ERR_UNCOR_STATUS, ®32); pci_write_config_dword(pdev, aer + PCI_ERR_UNCOR_STATUS, reg32); - /* Enable Root Port's interrupt in response to error messages */ - pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, ®32); - reg32 |= ROOT_PORT_INTR_ON_MESG_MASK; - pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32); + aer_enable_irq(pdev); } /** @@ -1274,10 +1293,7 @@ static void aer_disable_rootport(struct aer_rpc *rpc) int aer = pdev->aer_cap; u32 reg32; - /* Disable Root's interrupt in response to error messages */ - pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, ®32); - reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK; - pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32); + aer_disable_irq(pdev); /* Clear Root's error status reg */ pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_STATUS, ®32); @@ -1372,12 +1388,8 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev) */ aer = root ? root->aer_cap : 0; - if ((host->native_aer || pcie_ports_native) && aer) { - /* Disable Root's interrupt in response to error messages */ - pci_read_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, ®32); - reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK; - pci_write_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, reg32); - } + if ((host->native_aer || pcie_ports_native) && aer) + aer_disable_irq(root); if (type == PCI_EXP_TYPE_RC_EC || type == PCI_EXP_TYPE_RC_END) { rc = pcie_reset_flr(dev, PCI_RESET_DO_RESET); @@ -1396,10 +1408,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev) pci_read_config_dword(root, aer + PCI_ERR_ROOT_STATUS, ®32); pci_write_config_dword(root, aer + PCI_ERR_ROOT_STATUS, reg32); - /* Enable Root Port's interrupt in response to error messages */ - pci_read_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, ®32); - reg32 |= ROOT_PORT_INTR_ON_MESG_MASK; - pci_write_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, reg32); + aer_enable_irq(root); } return rc ? PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_RECOVERED; From patchwork Thu Apr 20 01:58:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 1771002 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=canonical.com header.i=@canonical.com header.a=rsa-sha256 header.s=20210705 header.b=sX7r+Fnp; dkim-atps=neutral Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by legolas.ozlabs.org (Postfix) with ESMTP id 4Q217H3yBrz23td for ; Thu, 20 Apr 2023 11:59:39 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231442AbjDTB7b (ORCPT ); Wed, 19 Apr 2023 21:59:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54020 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230081AbjDTB73 (ORCPT ); Wed, 19 Apr 2023 21:59:29 -0400 Received: from smtp-relay-canonical-1.canonical.com (smtp-relay-canonical-1.canonical.com [185.125.188.121]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0AD6C3A90; Wed, 19 Apr 2023 18:59:28 -0700 (PDT) Received: from localhost.localdomain (unknown [10.101.196.174]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id 0B89342A36; Thu, 20 Apr 2023 01:59:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1681955966; bh=GvxobRKlf1r2LOJfuxc46vcCZjfhma6sFjPHV1PVN6U=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=sX7r+FnpAZXsSCx+1VAfxDUdCmhTZTfKO7rwZ74TZYTIxDapUUdxufd1gpNOpkJxo /0h8kZ7w5yIcr5sf+ryx2IZVyRroMoj53kKOxclAjWuq9yhz1QhNSHBHym/bAOgRyC I+qGjo/8NZkPfMY8rtHXGckoMa29gnEaLGzsowqr086N68LszOSODjaRo+SLoUiZGj +34op4nwdw6irkISngwcyYAiCsmoLzzpmbGPzQqBMz4WbqMlxzqcD+g5yahb8K0IRQ EwrhO3del6Wo1xl55st8SNV2x0Zz/1ipCmhMAMFlzYTTdBQnVO5gY72BeEApwsBeGG YcZ4UXZ5dHkUg== From: Kai-Heng Feng To: bhelgaas@google.com Cc: mika.westerberg@linux.intel.com, koba.ko@canonical.com, sathyanarayanan.kuppuswamy@linux.intel.com, Kai-Heng Feng , Mahesh J Salgaonkar , "Oliver O'Halloran" , linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/4] PCI/AER: Disable AER interrupt on suspend Date: Thu, 20 Apr 2023 09:58:29 +0800 Message-Id: <20230420015830.309845-3-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230420015830.309845-1-kai.heng.feng@canonical.com> References: <20230420015830.309845-1-kai.heng.feng@canonical.com> MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org PCIe service that shares IRQ with PME may cause spurious wakeup on system suspend. PCIe Base Spec 5.0, section 5.2 "Link State Power Management" states that TLP and DLLP transmission is disabled for a Link in L2/L3 Ready (D3hot), L2 (D3cold with aux power) and L3 (D3cold), so we don't lose much here to disable AER during system suspend. This is very similar to previous attempts to suspend AER and DPC [1], but with a different reason. [1] https://lore.kernel.org/linux-pci/20220408153159.106741-1-kai.heng.feng@canonical.com/ Link: https://bugzilla.kernel.org/show_bug.cgi?id=216295 Signed-off-by: Kai-Heng Feng Reviewed-by: Mika Westerberg --- v2: - Only disable AER IRQ. - No more check on PME IRQ#. - Use helper. drivers/pci/pcie/aer.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index 1420e1f27105..9c07fdbeb52d 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -1356,6 +1356,26 @@ static int aer_probe(struct pcie_device *dev) return 0; } +static int aer_suspend(struct pcie_device *dev) +{ + struct aer_rpc *rpc = get_service_data(dev); + struct pci_dev *pdev = rpc->rpd; + + aer_disable_irq(pdev); + + return 0; +} + +static int aer_resume(struct pcie_device *dev) +{ + struct aer_rpc *rpc = get_service_data(dev); + struct pci_dev *pdev = rpc->rpd; + + aer_enable_irq(pdev); + + return 0; +} + /** * aer_root_reset - reset Root Port hierarchy, RCEC, or RCiEP * @dev: pointer to Root Port, RCEC, or RCiEP @@ -1420,6 +1440,8 @@ static struct pcie_port_service_driver aerdriver = { .service = PCIE_PORT_SERVICE_AER, .probe = aer_probe, + .suspend = aer_suspend, + .resume = aer_resume, .remove = aer_remove, }; From patchwork Thu Apr 20 01:58:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 1771001 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=canonical.com header.i=@canonical.com header.a=rsa-sha256 header.s=20210705 header.b=JA/W3MZn; dkim-atps=neutral Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by legolas.ozlabs.org (Postfix) with ESMTP id 4Q217H1rnrz23hs for ; Thu, 20 Apr 2023 11:59:39 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232623AbjDTB7g (ORCPT ); Wed, 19 Apr 2023 21:59:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54210 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229736AbjDTB7e (ORCPT ); Wed, 19 Apr 2023 21:59:34 -0400 Received: from smtp-relay-canonical-1.canonical.com (smtp-relay-canonical-1.canonical.com [185.125.188.121]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 87DE559F7; Wed, 19 Apr 2023 18:59:32 -0700 (PDT) Received: from localhost.localdomain (unknown [10.101.196.174]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id 85DCD41ABE; Thu, 20 Apr 2023 01:59:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1681955971; bh=l7qV65a1Ex7JimCTQ70xlboGGlA6oTb+7PSGlAKXVZY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=JA/W3MZnZs8oMCb27sG0qP7Lqyw+YrWx9VLJ8GmTzHl1Gi+C1NDmxi22GikzwmZY6 ftq9VmOYoMOfdQyB0vnGwxq8vGP/AsB9pTxd+Cod2XRQ1NhFeXKhjRmWPlDw1HGBA6 noUqUUg3Sxe/igXl3K0K6BKJfANPD3Yjcsig6BO1Sv9nBJuC2BbQ9WMTWEXsomsoM+ Onr3nwZVHCxndNi8CriRRd9lS4fjIxXjmYkricY31kHkGO3M7O1g3CGnMGesWp99kX V3afaJ5m3g0y2GCH20MB13SZ09aKj0YupHxq5jptYnLJjX4LkP+Gj2E2td2ES1+TRA 3xUd9QrKluUsg== From: Kai-Heng Feng To: bhelgaas@google.com Cc: mika.westerberg@linux.intel.com, koba.ko@canonical.com, sathyanarayanan.kuppuswamy@linux.intel.com, Kai-Heng Feng , Mahesh J Salgaonkar , "Oliver O'Halloran" , linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 4/4] PCI/DPC: Disable DPC interrupt during suspend Date: Thu, 20 Apr 2023 09:58:30 +0800 Message-Id: <20230420015830.309845-4-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230420015830.309845-1-kai.heng.feng@canonical.com> References: <20230420015830.309845-1-kai.heng.feng@canonical.com> MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org PCIe service that shares IRQ with PME may cause spurious wakeup on system suspend. Since AER is conditionally disabled in previous patch, also apply the same logic to disable DPC which depends on AER to work. PCIe Base Spec 5.0, section 5.2 "Link State Power Management" states that TLP and DLLP transmission is disabled for a Link in L2/L3 Ready (D3hot), L2 (D3cold with aux power) and L3 (D3cold), so we don't lose much here to disable DPC during system suspend. This is very similar to previous attempts to suspend AER and DPC [1], but with a different reason. [1] https://lore.kernel.org/linux-pci/20220408153159.106741-1-kai.heng.feng@canonical.com/ Link: https://bugzilla.kernel.org/show_bug.cgi?id=216295 Signed-off-by: Kai-Heng Feng Reviewed-by: Mika Westerberg --- v2: - Only disable DPC IRQ. - No more check on PME IRQ#. drivers/pci/pcie/dpc.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c index a5d7c69b764e..98bdefde6df1 100644 --- a/drivers/pci/pcie/dpc.c +++ b/drivers/pci/pcie/dpc.c @@ -385,6 +385,30 @@ static int dpc_probe(struct pcie_device *dev) return status; } +static int dpc_suspend(struct pcie_device *dev) +{ + struct pci_dev *pdev = dev->port; + u16 ctl; + + pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, &ctl); + ctl &= ~PCI_EXP_DPC_CTL_INT_EN; + pci_write_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, ctl); + + return 0; +} + +static int dpc_resume(struct pcie_device *dev) +{ + struct pci_dev *pdev = dev->port; + u16 ctl; + + pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, &ctl); + ctl |= PCI_EXP_DPC_CTL_INT_EN; + pci_write_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, ctl); + + return 0; +} + static void dpc_remove(struct pcie_device *dev) { struct pci_dev *pdev = dev->port; @@ -400,6 +424,8 @@ static struct pcie_port_service_driver dpcdriver = { .port_type = PCIE_ANY_PORT, .service = PCIE_PORT_SERVICE_DPC, .probe = dpc_probe, + .suspend = dpc_suspend, + .resume = dpc_resume, .remove = dpc_remove, };