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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by CY4PEPF0000EE34.mail.protection.outlook.com (10.167.242.40) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7633.15 via Frontend Transport; Fri, 31 May 2024 21:39:04 +0000 Received: from weiserver.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Fri, 31 May 2024 16:39:03 -0500 From: Wei Huang To: , , , CC: , , , , , , , , , , , , , , , , , Subject: [PATCH V2 1/9] PCI: Introduce PCIe TPH support framework Date: Fri, 31 May 2024 16:38:33 -0500 Message-ID: <20240531213841.3246055-2-wei.huang2@amd.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240531213841.3246055-1-wei.huang2@amd.com> References: <20240531213841.3246055-1-wei.huang2@amd.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE34:EE_|PH8PR12MB8431:EE_ X-MS-Office365-Filtering-Correlation-Id: 31e8a3cc-48f3-4111-cf9a-08dc81ba180d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|1800799015|7416005|82310400017|376005|36860700004; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 May 2024 21:39:04.6132 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 31e8a3cc-48f3-4111-cf9a-08dc81ba180d X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EE34.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB8431 This patch implements the framework for PCIe TPH support. It introduces tph.c source file, along with CONFIG_PCIE_TPH, to Linux PCIe subsystem. A new member, named tph_cap, is also introduced in pci_dev to cache TPH capability offset. Co-developed-by: Eric Van Tassell Signed-off-by: Eric Van Tassell Signed-off-by: Wei Huang Reviewed-by: Ajit Khaparde Reviewed-by: Somnath Kotur Reviewed-by: Andy Gospodarek Reviewed-by: Jonathan Cameron --- drivers/pci/pci.h | 6 ++++++ drivers/pci/pcie/Kconfig | 10 ++++++++++ drivers/pci/pcie/Makefile | 1 + drivers/pci/pcie/tph.c | 28 ++++++++++++++++++++++++++++ drivers/pci/probe.c | 1 + include/linux/pci.h | 4 ++++ 6 files changed, 50 insertions(+) create mode 100644 drivers/pci/pcie/tph.c diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index fd44565c4756..b371b5b45f86 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -506,6 +506,12 @@ static inline int pci_iov_bus_range(struct pci_bus *bus) #endif /* CONFIG_PCI_IOV */ +#ifdef CONFIG_PCIE_TPH +void pcie_tph_init(struct pci_dev *dev); +#else +static inline void pcie_tph_init(struct pci_dev *dev) {} +#endif + #ifdef CONFIG_PCIE_PTM void pci_ptm_init(struct pci_dev *dev); void pci_save_ptm_state(struct pci_dev *dev); diff --git a/drivers/pci/pcie/Kconfig b/drivers/pci/pcie/Kconfig index 17919b99fa66..d22857325b3e 100644 --- a/drivers/pci/pcie/Kconfig +++ b/drivers/pci/pcie/Kconfig @@ -155,3 +155,13 @@ config PCIE_EDR the PCI Firmware Specification r3.2. Enable this if you want to support hybrid DPC model which uses both firmware and OS to implement DPC. + +config PCIE_TPH + bool "TLP Processing Hints" + default n + help + This option adds support for PCIE TLP Processing Hints (TPH). + TPH allows endpoint devices to provide optimization hints, such as + desired caching behavior, for requests that target memory space. + These hints, called steering tags, can empower the system hardware + to optimize the utilization of platform resources. diff --git a/drivers/pci/pcie/Makefile b/drivers/pci/pcie/Makefile index 6461aa93fe76..3542b42ea0b9 100644 --- a/drivers/pci/pcie/Makefile +++ b/drivers/pci/pcie/Makefile @@ -13,3 +13,4 @@ obj-$(CONFIG_PCIE_PME) += pme.o obj-$(CONFIG_PCIE_DPC) += dpc.o obj-$(CONFIG_PCIE_PTM) += ptm.o obj-$(CONFIG_PCIE_EDR) += edr.o +obj-$(CONFIG_PCIE_TPH) += tph.o diff --git a/drivers/pci/pcie/tph.c b/drivers/pci/pcie/tph.c new file mode 100644 index 000000000000..5f0cc06b74bb --- /dev/null +++ b/drivers/pci/pcie/tph.c @@ -0,0 +1,28 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * TPH (TLP Processing Hints) support + * + * Copyright (C) 2024 Advanced Micro Devices, Inc. + * Eric Van Tassell + * Wei Huang + */ + +#define pr_fmt(fmt) "TPH: " fmt +#define dev_fmt pr_fmt + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../pci.h" + +void pcie_tph_init(struct pci_dev *dev) +{ + dev->tph_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_TPH); +} + diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 15168881ec94..1f1ae55a5f83 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2484,6 +2484,7 @@ static void pci_init_capabilities(struct pci_dev *dev) pci_dpc_init(dev); /* Downstream Port Containment */ pci_rcec_init(dev); /* Root Complex Event Collector */ pci_doe_init(dev); /* Data Object Exchange */ + pcie_tph_init(dev); /* TLP Processing Hints */ pcie_report_downtraining(dev); pci_init_reset_methods(dev); diff --git a/include/linux/pci.h b/include/linux/pci.h index 5bece7fd11f8..d75a88ec5136 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -530,6 +530,10 @@ struct pci_dev { /* These methods index pci_reset_fn_methods[] */ u8 reset_methods[PCI_NUM_RESET_METHODS]; /* In priority order */ + +#ifdef CONFIG_PCIE_TPH + u16 tph_cap; /* TPH capability offset */ +#endif }; static inline struct pci_dev *pci_physfn(struct pci_dev *dev)