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Wed, 21 Aug 2019 00:23:33 +0000 From: Haiyang Zhang To: "sashal@kernel.org" , "davem@davemloft.net" , "saeedm@mellanox.com" , "leon@kernel.org" , "eranbe@mellanox.com" , "lorenzo.pieralisi@arm.com" , "bhelgaas@google.com" , "linux-pci@vger.kernel.org" , "linux-hyperv@vger.kernel.org" , "netdev@vger.kernel.org" CC: Haiyang Zhang , KY Srinivasan , Stephen Hemminger , "linux-kernel@vger.kernel.org" Subject: [PATCH net-next,v3, 2/6] PCI: hv: Add a Hyper-V PCI interface driver for software backchannel interface Thread-Topic: [PATCH net-next,v3, 2/6] PCI: hv: Add a Hyper-V PCI interface driver for software backchannel interface Thread-Index: AQHVV7aqTXaW6mDaBE2Uols+NDE8ew== Date: Wed, 21 Aug 2019 00:23:32 +0000 Message-ID: <1566346948-69497-3-git-send-email-haiyangz@microsoft.com> References: <1566346948-69497-1-git-send-email-haiyangz@microsoft.com> In-Reply-To: <1566346948-69497-1-git-send-email-haiyangz@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: MWHPR02CA0034.namprd02.prod.outlook.com (2603:10b6:301:60::23) To DM6PR21MB1242.namprd21.prod.outlook.com (2603:10b6:5:169::22) authentication-results: spf=none (sender IP is ) smtp.mailfrom=lkmlhyz@microsoft.com; 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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: m7p6oUHLvOpPXk6jkSuwjQqvXYML2EkyaAb3Fl9DdasUnjfJOttwrbiPZr49NXkYroVypLda+GbVVnm8puSqWhFUtS4UdS0lWjwYQo7UhZ95Duilq/OLnHJgcMzEyPoZJxLxDEVph2WT0nPA9+UOrtq/1ORj5atomSPxXGW4sTJ3N68Nn9FxxWBYEIy7iJAg0fF1kttRIXeI4sJHJvY/DvDRcPz85SbbLY8HoYRFy5Teh2myD4lXqkylX4Mg8DvUm2DZiYEvzt3mr1KJfmir5mt5+TDJr7g8DJpfDfSC7ZybI1zeNoyuRBip6rQJOmTr43J1QUhpVL+WYllF59S4tZEmv+qKSTX8E1lKGQnKOdUG4WoTJZ6t5agujDnK4Jc01scYeYWnV6QAKIL371IdMmCoOQgWUgLHRMARXaNu4Rg= MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: b1281573-a2a9-4d35-06f5-08d725cdcca4 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Aug 2019 00:23:32.9778 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 0Tn5dp5QosrciQRlwO086N9L5GukNR2t75QJxcN4m1VqQuLc9yzg7+9O0RysOqfSNJPQ7Mi9AC8UwKKzfaOpRg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR21MB1450 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This interface driver is a helper driver allows other drivers to have a common interface with the Hyper-V PCI frontend driver. Signed-off-by: Haiyang Zhang Signed-off-by: Saeed Mahameed --- MAINTAINERS | 1 + drivers/pci/Kconfig | 1 + drivers/pci/controller/Kconfig | 7 ++++ drivers/pci/controller/Makefile | 1 + drivers/pci/controller/pci-hyperv-intf.c | 67 ++++++++++++++++++++++++++++++++ drivers/pci/controller/pci-hyperv.c | 12 ++++-- include/linux/hyperv.h | 30 ++++++++++---- 7 files changed, 108 insertions(+), 11 deletions(-) create mode 100644 drivers/pci/controller/pci-hyperv-intf.c diff --git a/MAINTAINERS b/MAINTAINERS index e352550..866ae88 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7453,6 +7453,7 @@ F: drivers/hid/hid-hyperv.c F: drivers/hv/ F: drivers/input/serio/hyperv-keyboard.c F: drivers/pci/controller/pci-hyperv.c +F: drivers/pci/controller/pci-hyperv-intf.c F: drivers/net/hyperv/ F: drivers/scsi/storvsc_drv.c F: drivers/uio/uio_hv_generic.c diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 2ab9240..c313de9 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -182,6 +182,7 @@ config PCI_LABEL config PCI_HYPERV tristate "Hyper-V PCI Frontend" depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64 + select PCI_HYPERV_INTERFACE help The PCI device frontend driver allows the kernel to import arbitrary PCI devices from a PCI backend to support PCI driver domains. diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig index fe9f9f1..70e0782 100644 --- a/drivers/pci/controller/Kconfig +++ b/drivers/pci/controller/Kconfig @@ -281,5 +281,12 @@ config VMD To compile this driver as a module, choose M here: the module will be called vmd. +config PCI_HYPERV_INTERFACE + tristate "Hyper-V PCI Interface" + depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64 + help + The Hyper-V PCI Interface is a helper driver allows other drivers to + have a common interface with the Hyper-V PCI frontend driver. + source "drivers/pci/controller/dwc/Kconfig" endmenu diff --git a/drivers/pci/controller/Makefile b/drivers/pci/controller/Makefile index d56a507..a2a22c9 100644 --- a/drivers/pci/controller/Makefile +++ b/drivers/pci/controller/Makefile @@ -4,6 +4,7 @@ obj-$(CONFIG_PCIE_CADENCE_HOST) += pcie-cadence-host.o obj-$(CONFIG_PCIE_CADENCE_EP) += pcie-cadence-ep.o obj-$(CONFIG_PCI_FTPCI100) += pci-ftpci100.o obj-$(CONFIG_PCI_HYPERV) += pci-hyperv.o +obj-$(CONFIG_PCI_HYPERV_INTERFACE) += pci-hyperv-intf.o obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o obj-$(CONFIG_PCI_AARDVARK) += pci-aardvark.o obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o diff --git a/drivers/pci/controller/pci-hyperv-intf.c b/drivers/pci/controller/pci-hyperv-intf.c new file mode 100644 index 0000000..cc96be4 --- /dev/null +++ b/drivers/pci/controller/pci-hyperv-intf.c @@ -0,0 +1,67 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) Microsoft Corporation. + * + * Author: + * Haiyang Zhang + * + * This small module is a helper driver allows other drivers to + * have a common interface with the Hyper-V PCI frontend driver. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include + +struct hyperv_pci_block_ops hvpci_block_ops; +EXPORT_SYMBOL_GPL(hvpci_block_ops); + +int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len, + unsigned int block_id, unsigned int *bytes_returned) +{ + if (!hvpci_block_ops.read_block) + return -EOPNOTSUPP; + + return hvpci_block_ops.read_block(dev, buf, buf_len, block_id, + bytes_returned); +} +EXPORT_SYMBOL_GPL(hyperv_read_cfg_blk); + +int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len, + unsigned int block_id) +{ + if (!hvpci_block_ops.write_block) + return -EOPNOTSUPP; + + return hvpci_block_ops.write_block(dev, buf, len, block_id); +} +EXPORT_SYMBOL_GPL(hyperv_write_cfg_blk); + +int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context, + void (*block_invalidate)(void *context, + u64 block_mask)) +{ + if (!hvpci_block_ops.reg_blk_invalidate) + return -EOPNOTSUPP; + + return hvpci_block_ops.reg_blk_invalidate(dev, context, + block_invalidate); +} +EXPORT_SYMBOL_GPL(hyperv_reg_block_invalidate); + +static void __exit exit_hv_pci_intf(void) +{ +} + +static int __init init_hv_pci_intf(void) +{ + return 0; +} + +module_init(init_hv_pci_intf); +module_exit(exit_hv_pci_intf); + +MODULE_DESCRIPTION("Hyper-V PCI Interface"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index 57adeca..9c93ac2 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -983,7 +983,6 @@ int hv_read_config_block(struct pci_dev *pdev, void *buf, unsigned int len, *bytes_returned = comp_pkt.bytes_returned; return 0; } -EXPORT_SYMBOL(hv_read_config_block); /** * hv_pci_write_config_compl() - Invoked when a response packet for a write @@ -1070,7 +1069,6 @@ int hv_write_config_block(struct pci_dev *pdev, void *buf, unsigned int len, return 0; } -EXPORT_SYMBOL(hv_write_config_block); /** * hv_register_block_invalidate() - Invoked when a config block invalidation @@ -1101,7 +1099,6 @@ int hv_register_block_invalidate(struct pci_dev *pdev, void *context, return 0; } -EXPORT_SYMBOL(hv_register_block_invalidate); /* Interrupt management hooks */ static void hv_int_desc_free(struct hv_pci_dev *hpdev, @@ -3045,10 +3042,19 @@ static int hv_pci_remove(struct hv_device *hdev) static void __exit exit_hv_pci_drv(void) { vmbus_driver_unregister(&hv_pci_drv); + + hvpci_block_ops.read_block = NULL; + hvpci_block_ops.write_block = NULL; + hvpci_block_ops.reg_blk_invalidate = NULL; } static int __init init_hv_pci_drv(void) { + /* Initialize PCI block r/w interface */ + hvpci_block_ops.read_block = hv_read_config_block; + hvpci_block_ops.write_block = hv_write_config_block; + hvpci_block_ops.reg_blk_invalidate = hv_register_block_invalidate; + return vmbus_driver_register(&hv_pci_drv); } diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 9d37f8c..2afe6fd 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -1579,18 +1579,32 @@ struct vmpacket_descriptor * pkt = hv_pkt_iter_next(channel, pkt)) /* - * Functions for passing data between SR-IOV PF and VF drivers. The VF driver + * Interface for passing data between SR-IOV PF and VF drivers. The VF driver * sends requests to read and write blocks. Each block must be 128 bytes or * smaller. Optionally, the VF driver can register a callback function which * will be invoked when the host says that one or more of the first 64 block * IDs is "invalid" which means that the VF driver should reread them. */ #define HV_CONFIG_BLOCK_SIZE_MAX 128 -int hv_read_config_block(struct pci_dev *dev, void *buf, unsigned int buf_len, - unsigned int block_id, unsigned int *bytes_returned); -int hv_write_config_block(struct pci_dev *dev, void *buf, unsigned int len, - unsigned int block_id); -int hv_register_block_invalidate(struct pci_dev *dev, void *context, - void (*block_invalidate)(void *context, - u64 block_mask)); + +int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len, + unsigned int block_id, unsigned int *bytes_returned); +int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len, + unsigned int block_id); +int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context, + void (*block_invalidate)(void *context, + u64 block_mask)); + +struct hyperv_pci_block_ops { + int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len, + unsigned int block_id, unsigned int *bytes_returned); + int (*write_block)(struct pci_dev *dev, void *buf, unsigned int len, + unsigned int block_id); + int (*reg_blk_invalidate)(struct pci_dev *dev, void *context, + void (*block_invalidate)(void *context, + u64 block_mask)); +}; + +extern struct hyperv_pci_block_ops hvpci_block_ops; + #endif /* _HYPERV_H */