From patchwork Tue Oct 27 02:57:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 11859287 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 46E7F14B7 for ; Tue, 27 Oct 2020 02:57:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 31F8B20691 for ; Tue, 27 Oct 2020 02:57:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2409442AbgJ0C5a (ORCPT ); Mon, 26 Oct 2020 22:57:30 -0400 Received: from mga01.intel.com ([192.55.52.88]:23078 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2408658AbgJ0C5S (ORCPT ); Mon, 26 Oct 2020 22:57:18 -0400 IronPort-SDR: 2zdadd6EsFHcuoTHIJhSf0iImTX8jhPLaTMJsfFxZSfl3cWaWr5seqMAhMUHS4gefmJSpIE8CW zQaGmj1wtrGw== X-IronPort-AV: E=McAfee;i="6000,8403,9786"; a="185753263" X-IronPort-AV: E=Sophos;i="5.77,422,1596524400"; d="scan'208";a="185753263" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Oct 2020 19:57:16 -0700 IronPort-SDR: kpiqhyOjYWodmdEeIpRH9DLr3Qxbp6geQwnMrQx7rhUhCrPBTq4H5qlau1hPpdewcjqF0bu2da vBA4bOfnxeOA== X-IronPort-AV: E=Sophos;i="5.77,422,1596524400"; d="scan'208";a="322772476" Received: from dhrubajy-mobl.amr.corp.intel.com (HELO skuppusw-mobl5.amr.corp.intel.com) ([10.254.101.53]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Oct 2020 19:57:16 -0700 From: Kuppuswamy Sathyanarayanan To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, knsathya@kernel.org Subject: [PATCH v11 3/5] ACPI/PCI: Ignore _OSC DPC negotiation result if pcie_ports_dpc_native is set. Date: Mon, 26 Oct 2020 19:57:06 -0700 Message-Id: <0ec11f2b7470070768886a138f2a755620725a06.1603766889.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org pcie_ports_dpc_native is set only if user requests native handling of PCIe DPC capability via pcie_port_setup command line option. User input takes precedence over _OSC based control negotiation result. So consider the _OSC negotiated result for DPC ownership only if pcie_ports_dpc_native is unset. Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/acpi/pci_root.c | 8 ++++++-- drivers/pci/pcie/dpc.c | 3 ++- drivers/pci/pcie/portdrv.h | 2 -- drivers/pci/pcie/portdrv_core.c | 2 +- include/linux/pci.h | 2 ++ 5 files changed, 11 insertions(+), 6 deletions(-) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index a9e6b782622d..2e2bc80c42fe 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -933,8 +933,12 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, host_bridge->native_pme); OSC_OWNER(ctrl, OSC_PCI_EXPRESS_LTR_CONTROL, host_bridge->native_ltr); - OSC_OWNER(ctrl, OSC_PCI_EXPRESS_DPC_CONTROL, - host_bridge->native_dpc); + if (pcie_ports_dpc_native) + dev_warn(&bus->dev, "OS forcibly taking over DPC\n"); + else + OSC_OWNER(ctrl, OSC_PCI_EXPRESS_DPC_CONTROL, + host_bridge->native_dpc); + } if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL)) diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c index e05aba86a317..21f77420632b 100644 --- a/drivers/pci/pcie/dpc.c +++ b/drivers/pci/pcie/dpc.c @@ -283,11 +283,12 @@ void pci_dpc_init(struct pci_dev *pdev) static int dpc_probe(struct pcie_device *dev) { struct pci_dev *pdev = dev->port; + struct pci_host_bridge *host = pci_find_host_bridge(pdev->bus); struct device *device = &dev->device; int status; u16 ctl, cap; - if (!pcie_aer_is_native(pdev) && !pcie_ports_dpc_native) + if (!pcie_aer_is_native(pdev) && !host->native_dpc) return -ENOTSUPP; status = devm_request_threaded_irq(device, dev->irq, dpc_irq, diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h index af7cf237432a..0ac20feef24e 100644 --- a/drivers/pci/pcie/portdrv.h +++ b/drivers/pci/pcie/portdrv.h @@ -25,8 +25,6 @@ #define PCIE_PORT_DEVICE_MAXSERVICES 5 -extern bool pcie_ports_dpc_native; - #ifdef CONFIG_PCIEAER int pcie_aer_init(void); int pcie_aer_is_native(struct pci_dev *dev); diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c index ccd5e0ce5605..2c0278f0fdcc 100644 --- a/drivers/pci/pcie/portdrv_core.c +++ b/drivers/pci/pcie/portdrv_core.c @@ -253,7 +253,7 @@ static int get_port_device_capability(struct pci_dev *dev) */ if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) && pci_aer_available() && - (pcie_ports_dpc_native || (services & PCIE_PORT_SERVICE_AER))) + (host->native_dpc || (services & PCIE_PORT_SERVICE_AER))) services |= PCIE_PORT_SERVICE_DPC; if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM || diff --git a/include/linux/pci.h b/include/linux/pci.h index 22207a79762c..388121ec88b5 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1559,9 +1559,11 @@ static inline int pci_irqd_intx_xlate(struct irq_domain *d, #ifdef CONFIG_PCIEPORTBUS extern bool pcie_ports_disabled; extern bool pcie_ports_native; +extern bool pcie_ports_dpc_native; #else #define pcie_ports_disabled true #define pcie_ports_native false +#define pcie_ports_dpc_native false #endif #define PCIE_LINK_STATE_L0S BIT(0)