From patchwork Thu Jan 27 02:54:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kai-Heng Feng X-Patchwork-Id: 12726164 X-Patchwork-Delegate: bhelgaas@google.com 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 A8878C433F5 for ; Thu, 27 Jan 2022 02:54:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233384AbiA0Cye (ORCPT ); Wed, 26 Jan 2022 21:54:34 -0500 Received: from smtp-relay-canonical-0.canonical.com ([185.125.188.120]:39902 "EHLO smtp-relay-canonical-0.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229484AbiA0Cye (ORCPT ); Wed, 26 Jan 2022 21:54:34 -0500 Received: from HP-EliteBook-840-G7.. (1-171-96-243.dynamic-ip.hinet.net [1.171.96.243]) (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-0.canonical.com (Postfix) with ESMTPSA id 086934198F; Thu, 27 Jan 2022 02:54:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1643252073; bh=dcz08jVbu1mA7GIKnSrxl/nuKVZjYAe2DF3bK5Id0Sw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=kiohJPlyf0FHjb6tqaYCzNqdpekBXpHyT69Gl8JUzQwUdEi/vZ8BZnxk95oPhdUlz wCNBNKY8sZNoQB4bUr3IJSZ+UBNVVaCFFTCqBh/YS+dj7Npz75O93Ul07AEW6dQgEH lqibWnbCYJ09Jk+08QXUeDYJzrInkFnWKOFPdo6CmYLgoerxG7sOqvgKfEGJQaTIgu 4CHJ3hNDLeq3koCowskFyvt2i/XFIeKETucBzLOF0aHdVf4IaqVKIISCHh91HA6Xjc br1P479W5A1LfLZ7w4ILExKN++OuzkwJv8qAeQsDHoBtF0WQAba4BeAjLAAEyEFuxL hfkXl3I3n0T8A== From: Kai-Heng Feng To: bhelgaas@google.com Cc: mika.westerberg@linux.intel.com, koba.ko@canonical.com, Kai-Heng Feng , Russell Currey , "Oliver O'Halloran" , linuxppc-dev@lists.ozlabs.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] PCI/DPC: Disable DPC service when link is in L2/L3 ready, L2 and L3 state Date: Thu, 27 Jan 2022 10:54:18 +0800 Message-Id: <20220127025418.1989642-2-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20220127025418.1989642-1-kai.heng.feng@canonical.com> References: <20220127025418.1989642-1-kai.heng.feng@canonical.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Since TLP and DLLP transmission is disabled for a Link in L2/L3 Ready, L2 and L3 (i.e. device in D3hot and D3cold), and DPC depends on AER, so also disable DPC here. Signed-off-by: Kai-Heng Feng Reviewed-by: Mika Westerberg --- v2: - Wording change. - Empty line dropped. drivers/pci/pcie/dpc.c | 60 +++++++++++++++++++++++++++++++----------- 1 file changed, 44 insertions(+), 16 deletions(-) diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c index 3e9afee02e8d1..414258967f08e 100644 --- a/drivers/pci/pcie/dpc.c +++ b/drivers/pci/pcie/dpc.c @@ -343,13 +343,33 @@ void pci_dpc_init(struct pci_dev *pdev) } } +static void dpc_enable(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 = (ctl & 0xfff4) | PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN; + pci_write_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, ctl); +} + +static void dpc_disable(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_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN); + pci_write_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, ctl); +} + #define FLAG(x, y) (((x) & (y)) ? '+' : '-') static int dpc_probe(struct pcie_device *dev) { struct pci_dev *pdev = dev->port; struct device *device = &dev->device; int status; - u16 ctl, cap; + u16 cap; if (!pcie_aer_is_native(pdev) && !pcie_ports_dpc_native) return -ENOTSUPP; @@ -364,10 +384,7 @@ static int dpc_probe(struct pcie_device *dev) } pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CAP, &cap); - pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, &ctl); - - ctl = (ctl & 0xfff4) | PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN; - pci_write_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, ctl); + dpc_enable(dev); pci_info(pdev, "enabled with IRQ %d\n", dev->irq); pci_info(pdev, "error containment capabilities: Int Msg #%d, RPExt%c PoisonedTLP%c SwTrigger%c RP PIO Log %d, DL_ActiveErr%c\n", @@ -380,22 +397,33 @@ static int dpc_probe(struct pcie_device *dev) return status; } -static void dpc_remove(struct pcie_device *dev) +static int dpc_suspend(struct pcie_device *dev) { - struct pci_dev *pdev = dev->port; - u16 ctl; + dpc_disable(dev); + return 0; +} - pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, &ctl); - ctl &= ~(PCI_EXP_DPC_CTL_EN_FATAL | PCI_EXP_DPC_CTL_INT_EN); - pci_write_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CTL, ctl); +static int dpc_resume(struct pcie_device *dev) +{ + dpc_enable(dev); + return 0; +} + +static void dpc_remove(struct pcie_device *dev) +{ + dpc_disable(dev); } static struct pcie_port_service_driver dpcdriver = { - .name = "dpc", - .port_type = PCIE_ANY_PORT, - .service = PCIE_PORT_SERVICE_DPC, - .probe = dpc_probe, - .remove = dpc_remove, + .name = "dpc", + .port_type = PCIE_ANY_PORT, + .service = PCIE_PORT_SERVICE_DPC, + .probe = dpc_probe, + .suspend = dpc_suspend, + .resume = dpc_resume, + .runtime_suspend = dpc_suspend, + .runtime_resume = dpc_resume, + .remove = dpc_remove, }; int __init pcie_dpc_init(void)