From patchwork Tue Mar 19 20:47:28 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuppuswamy Sathyanarayanan X-Patchwork-Id: 10860343 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D39F717EF for ; Tue, 19 Mar 2019 20:49:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B897429862 for ; Tue, 19 Mar 2019 20:49:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AA64129872; Tue, 19 Mar 2019 20:49:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 258DA29862 for ; Tue, 19 Mar 2019 20:49:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727534AbfCSUtg (ORCPT ); Tue, 19 Mar 2019 16:49:36 -0400 Received: from mga14.intel.com ([192.55.52.115]:15583 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727017AbfCSUtf (ORCPT ); Tue, 19 Mar 2019 16:49:35 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Mar 2019 13:49:35 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,246,1549958400"; d="scan'208";a="156465772" Received: from skuppusw-desk.jf.intel.com ([10.54.74.33]) by fmsmga001.fm.intel.com with ESMTP; 19 Mar 2019 13:49:34 -0700 From: sathyanarayanan.kuppuswamy@linux.intel.com To: bhelgaas@google.com, rjw@rjwysocki.net, lenb@kernel.org Cc: linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, ashok.raj@intel.com, keith.busch@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: [PATCH v2 1/2] PCI/ACPI: Add _OSC based negotiation support for DPC Date: Tue, 19 Mar 2019 13:47:28 -0700 Message-Id: <52a625782940c959bf48e3761193b5ff390959d4.1553027719.git.sathyanarayanan.kuppuswamy@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuppuswamy Sathyanarayanan As per PCI Firmware Specification, r3.2 ECN (https://members.pcisig.com/wg/PCI-SIG/document/12614), OS can use bit 7 of _OSC Control Field to negotiate control over Downstream Port Containment (DPC) configuration of PCIe port. After _OSC negotiation, firmware will Set this bit to grant OS control over PCIe DPC configuration and Clear it if this feature was requested and denied, or was not requested. Signed-off-by: Kuppuswamy Sathyanarayanan --- drivers/acpi/pci_root.c | 6 ++++++ drivers/pci/pcie/portdrv_core.c | 3 ++- drivers/pci/probe.c | 1 + include/linux/acpi.h | 3 ++- include/linux/pci.h | 1 + 5 files changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 707aafc7c2aa..a60261e50b08 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -154,6 +154,7 @@ static struct pci_osc_bit_struct pci_osc_control_bit[] = { { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, { OSC_PCI_EXPRESS_LTR_CONTROL, "LTR" }, + { OSC_PCI_EXPRESS_DPC_CONTROL, "DPC" }, }; static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, @@ -499,6 +500,9 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, control |= OSC_PCI_EXPRESS_AER_CONTROL; } + if (IS_ENABLED(CONFIG_PCIE_DPC)) + control |= OSC_PCI_EXPRESS_DPC_CONTROL; + requested = control; status = acpi_pci_osc_control_set(handle, &control, OSC_PCI_EXPRESS_CAPABILITY_CONTROL); @@ -927,6 +931,8 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, host_bridge->native_pme = 0; if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) host_bridge->native_ltr = 0; + if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL)) + host_bridge->native_dpc = 0; pci_scan_child_bus(bus); pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info, diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c index 7d04f9d087a6..865f12f4b314 100644 --- a/drivers/pci/pcie/portdrv_core.c +++ b/drivers/pci/pcie/portdrv_core.c @@ -250,7 +250,8 @@ static int get_port_device_capability(struct pci_dev *dev) } if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) && - pci_aer_available() && services & PCIE_PORT_SERVICE_AER) + pci_aer_available() && services & PCIE_PORT_SERVICE_AER && + (pcie_ports_native || host->native_dpc)) services |= PCIE_PORT_SERVICE_DPC; if (pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM || diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 2ec0df04e0dc..ef1118f70860 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -608,6 +608,7 @@ struct pci_host_bridge *pci_alloc_host_bridge(size_t priv) bridge->native_shpc_hotplug = 1; bridge->native_pme = 1; bridge->native_ltr = 1; + bridge->native_dpc = 1; return bridge; } diff --git a/include/linux/acpi.h b/include/linux/acpi.h index d5dcebd7aad3..f68e9513996b 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -522,7 +522,8 @@ extern bool osc_pc_lpi_support_confirmed; #define OSC_PCI_EXPRESS_AER_CONTROL 0x00000008 #define OSC_PCI_EXPRESS_CAPABILITY_CONTROL 0x00000010 #define OSC_PCI_EXPRESS_LTR_CONTROL 0x00000020 -#define OSC_PCI_CONTROL_MASKS 0x0000003f +#define OSC_PCI_EXPRESS_DPC_CONTROL 0x00000080 +#define OSC_PCI_CONTROL_MASKS 0x000000ff #define ACPI_GSB_ACCESS_ATTRIB_QUICK 0x00000002 #define ACPI_GSB_ACCESS_ATTRIB_SEND_RCV 0x00000004 diff --git a/include/linux/pci.h b/include/linux/pci.h index 77448215ef5b..1c38bcd200d1 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -502,6 +502,7 @@ struct pci_host_bridge { unsigned int native_shpc_hotplug:1; /* OS may use SHPC hotplug */ unsigned int native_pme:1; /* OS may use PCIe PME */ unsigned int native_ltr:1; /* OS may use PCIe LTR */ + unsigned int native_dpc:1; /* OS may use PCIe DPC */ /* Resource alignment requirements */ resource_size_t (*align_resource)(struct pci_dev *dev, const struct resource *res,