From patchwork Wed Oct 16 01:30:50 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhu, Lingshan" X-Patchwork-Id: 11192199 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 EFC8914DB for ; Wed, 16 Oct 2019 01:31:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C63E620873 for ; Wed, 16 Oct 2019 01:31:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389248AbfJPBbW (ORCPT ); Tue, 15 Oct 2019 21:31:22 -0400 Received: from mga14.intel.com ([192.55.52.115]:44948 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726786AbfJPBbV (ORCPT ); Tue, 15 Oct 2019 21:31:21 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Oct 2019 18:31:21 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,302,1566889200"; d="scan'208";a="279378843" Received: from lingshan-mobl5.ccr.corp.intel.com (HELO localhost.localdomain) ([10.249.68.79]) by orsmga001.jf.intel.com with ESMTP; 15 Oct 2019 18:31:13 -0700 From: Zhu Lingshan To: mst@redhat.com, jasowang@redhat.com, alex.williamson@redhat.com Cc: linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, netdev@vger.kernel.org, dan.daly@intel.com, cunming.liang@intel.com, tiwei.bie@intel.com, jason.zeng@intel.com, zhiyuan.lv@intel.com, Zhu Lingshan Subject: [RFC 2/2] vhost: IFC VF vdpa layer Date: Wed, 16 Oct 2019 09:30:50 +0800 Message-Id: <20191016013050.3918-3-lingshan.zhu@intel.com> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20191016013050.3918-1-lingshan.zhu@intel.com> References: <20191016013050.3918-1-lingshan.zhu@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This commit introduced IFC VF operations for vdpa, which complys to vhost_mdev interfaces, handles IFC VF initialization, configuration and removal. Signed-off-by: Zhu Lingshan --- drivers/vhost/ifcvf/ifcvf_main.c | 541 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 541 insertions(+) create mode 100644 drivers/vhost/ifcvf/ifcvf_main.c diff --git a/drivers/vhost/ifcvf/ifcvf_main.c b/drivers/vhost/ifcvf/ifcvf_main.c new file mode 100644 index 000000000000..c48a29969a85 --- /dev/null +++ b/drivers/vhost/ifcvf/ifcvf_main.c @@ -0,0 +1,541 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2019 Intel Corporation. + */ + +#include +#include +#include +#include +#include + +#include "ifcvf_base.h" + +#define VERSION_STRING "0.1" +#define DRIVER_AUTHOR "Intel Corporation" +#define IFCVF_DRIVER_NAME "ifcvf" + +static irqreturn_t ifcvf_intr_handler(int irq, void *arg) +{ + struct vring_info *vring = arg; + + if (vring->cb.callback) + return vring->cb.callback(vring->cb.private); + + return IRQ_HANDLED; +} + +static u64 ifcvf_mdev_get_features(struct mdev_device *mdev) +{ + return IFC_SUPPORTED_FEATURES; +} + +static int ifcvf_mdev_set_features(struct mdev_device *mdev, u64 features) +{ + struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev); + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + vf->req_features = features; + + return 0; +} + +static u64 ifcvf_mdev_get_vq_state(struct mdev_device *mdev, u16 qid) +{ + struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev); + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + return vf->vring[qid].last_avail_idx; +} + +static int ifcvf_mdev_set_vq_state(struct mdev_device *mdev, u16 qid, u64 num) +{ + struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev); + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + vf->vring[qid].last_used_idx = num; + vf->vring[qid].last_avail_idx = num; + + return 0; +} + +static int ifcvf_mdev_set_vq_address(struct mdev_device *mdev, u16 idx, + u64 desc_area, u64 driver_area, + u64 device_area) +{ + struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev); + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + vf->vring[idx].desc = desc_area; + vf->vring[idx].avail = driver_area; + vf->vring[idx].used = device_area; + + return 0; +} + +static void ifcvf_mdev_set_vq_num(struct mdev_device *mdev, u16 qid, u32 num) +{ + struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev); + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + vf->vring[qid].size = num; +} + +static void ifcvf_mdev_set_vq_ready(struct mdev_device *mdev, + u16 qid, bool ready) +{ + + struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev); + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + vf->vring[qid].ready = ready; +} + +static bool ifcvf_mdev_get_vq_ready(struct mdev_device *mdev, u16 qid) +{ + + struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev); + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + return vf->vring[qid].ready; +} + +static void ifcvf_mdev_set_vq_cb(struct mdev_device *mdev, u16 idx, + struct virtio_mdev_callback *cb) +{ + struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev); + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + vf->vring[idx].cb = *cb; +} + +static void ifcvf_mdev_kick_vq(struct mdev_device *mdev, u16 idx) +{ + struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev); + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + ifcvf_notify_queue(vf, idx); +} + +static u8 ifcvf_mdev_get_status(struct mdev_device *mdev) +{ + struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev); + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + return vf->status; +} + +static u32 ifcvf_mdev_get_generation(struct mdev_device *mdev) +{ + struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev); + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + return vf->generation; +} + +static int ifcvf_mdev_get_version(struct mdev_device *mdev) +{ + return VIRTIO_MDEV_VERSION; +} + +static u32 ifcvf_mdev_get_device_id(struct mdev_device *mdev) +{ + return IFCVF_DEVICE_ID; +} + +static u32 ifcvf_mdev_get_vendor_id(struct mdev_device *mdev) +{ + return IFCVF_VENDOR_ID; +} + +static u16 ifcvf_mdev_get_vq_align(struct mdev_device *mdev) +{ + return IFCVF_QUEUE_ALIGNMENT; +} + +static int ifcvf_start_datapath(void *private) +{ + int i, ret; + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(private); + + for (i = 0; i < (IFCVF_MAX_QUEUE_PAIRS * 2); i++) { + if (!vf->vring[i].ready) + break; + + if (!vf->vring[i].size) + break; + + if (!vf->vring[i].desc || !vf->vring[i].avail || + !vf->vring[i].used) + break; + } + vf->nr_vring = i; + + ret = ifcvf_start_hw(vf); + return ret; +} + +static int ifcvf_stop_datapath(void *private) +{ + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(private); + int i; + + for (i = 0; i < IFCVF_MAX_QUEUES; i++) + vf->vring[i].cb.callback = NULL; + + ifcvf_stop_hw(vf); + + return 0; +} + +static void ifcvf_reset_vring(struct ifcvf_adapter *adapter) +{ + int i; + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) { + vf->vring[i].last_used_idx = 0; + vf->vring[i].last_avail_idx = 0; + vf->vring[i].desc = 0; + vf->vring[i].avail = 0; + vf->vring[i].used = 0; + vf->vring[i].ready = 0; + vf->vring->cb.callback = NULL; + vf->vring->cb.private = NULL; + } +} + +static void ifcvf_mdev_set_status(struct mdev_device *mdev, u8 status) +{ + struct ifcvf_adapter *adapter = mdev_get_drvdata(mdev); + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + + vf->status = status; + + if (status == 0) { + ifcvf_stop_datapath(adapter); + ifcvf_reset_vring(adapter); + return; + } + + if (status & VIRTIO_CONFIG_S_DRIVER_OK) { + ifcvf_start_datapath(adapter); + return; + } +} + +static u16 ifcvf_mdev_get_queue_max(struct mdev_device *mdev) +{ + return IFCVF_MAX_QUEUES; +} + +static struct virtio_mdev_device_ops ifc_mdev_ops = { + .get_features = ifcvf_mdev_get_features, + .set_features = ifcvf_mdev_set_features, + .get_status = ifcvf_mdev_get_status, + .set_status = ifcvf_mdev_set_status, + .get_queue_max = ifcvf_mdev_get_queue_max, + .get_vq_state = ifcvf_mdev_get_vq_state, + .set_vq_state = ifcvf_mdev_set_vq_state, + .set_vq_cb = ifcvf_mdev_set_vq_cb, + .set_vq_ready = ifcvf_mdev_set_vq_ready, + .get_vq_ready = ifcvf_mdev_get_vq_ready, + .set_vq_num = ifcvf_mdev_set_vq_num, + .set_vq_address = ifcvf_mdev_set_vq_address, + .kick_vq = ifcvf_mdev_kick_vq, + .get_generation = ifcvf_mdev_get_generation, + .get_version = ifcvf_mdev_get_version, + .get_device_id = ifcvf_mdev_get_device_id, + .get_vendor_id = ifcvf_mdev_get_vendor_id, + .get_vq_align = ifcvf_mdev_get_vq_align, +}; + +static int ifcvf_init_msix(struct ifcvf_adapter *adapter) +{ + int vector, i, ret, irq; + struct pci_dev *pdev = to_pci_dev(adapter->dev); + struct ifcvf_hw *vf = &adapter->vf; + + ret = pci_alloc_irq_vectors(pdev, IFCVF_MAX_INTR, + IFCVF_MAX_INTR, PCI_IRQ_MSIX); + if (ret < 0) { + IFC_ERR(adapter->dev, "Failed to alloc irq vectors.\n"); + return ret; + } + + for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) { + vector = i + IFCVF_MSI_QUEUE_OFF; + irq = pci_irq_vector(pdev, vector); + ret = request_irq(irq, ifcvf_intr_handler, 0, + pci_name(pdev), &vf->vring[i]); + if (ret) { + IFC_ERR(adapter->dev, + "Failed to request irq for vq %d.\n", i); + return ret; + } + } + + return 0; +} + +static void ifcvf_destroy_adapter(struct ifcvf_adapter *adapter) +{ + int i, vector, irq; + struct ifcvf_hw *vf = IFC_PRIVATE_TO_VF(adapter); + struct pci_dev *pdev = to_pci_dev(adapter->dev); + + for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) { + vector = i + IFCVF_MSI_QUEUE_OFF; + irq = pci_irq_vector(pdev, vector); + free_irq(irq, &vf->vring[i]); + } +} + +static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf) +{ + const char *name = "vhost accelerator (virtio ring compatible)"; + + return sprintf(buf, "%s\n", name); +} +MDEV_TYPE_ATTR_RO(name); + +static ssize_t device_api_show(struct kobject *kobj, struct device *dev, + char *buf) +{ + return sprintf(buf, "%s\n", VIRTIO_MDEV_DEVICE_API_STRING); +} +MDEV_TYPE_ATTR_RO(device_api); + +static ssize_t available_instances_show(struct kobject *kobj, + struct device *dev, char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct ifcvf_adapter *adapter = pci_get_drvdata(pdev); + + return sprintf(buf, "%d\n", adapter->mdev_count); +} + +MDEV_TYPE_ATTR_RO(available_instances); + +static ssize_t type_show(struct kobject *kobj, + struct device *dev, char *buf) +{ + return sprintf(buf, "%s\n", "net"); +} + +MDEV_TYPE_ATTR_RO(type); + + +static struct attribute *mdev_types_attrs[] = { + &mdev_type_attr_name.attr, + &mdev_type_attr_device_api.attr, + &mdev_type_attr_available_instances.attr, + &mdev_type_attr_type.attr, + NULL, +}; + +static struct attribute_group mdev_type_group = { + .name = "vdpa_virtio", + .attrs = mdev_types_attrs, +}; + +static struct attribute_group *mdev_type_groups[] = { + &mdev_type_group, + NULL, +}; + +const struct attribute_group *mdev_dev_groups[] = { + NULL, +}; + +static int ifcvf_mdev_create(struct kobject *kobj, struct mdev_device *mdev) +{ + struct device *dev = mdev_parent_dev(mdev); + struct pci_dev *pdev = to_pci_dev(dev); + struct ifcvf_adapter *adapter = pci_get_drvdata(pdev); + int ret = 0; + + mutex_lock(&adapter->mdev_lock); + + if (adapter->mdev_count < 1) { + ret = -EINVAL; + goto out; + } + + mdev_set_class_id(mdev, MDEV_ID_VHOST); + mdev_set_dev_ops(mdev, &ifc_mdev_ops); + + mdev_set_drvdata(mdev, adapter); + mdev_set_iommu_device(mdev_dev(mdev), dev); + + INIT_LIST_HEAD(&adapter->dma_maps); + adapter->mdev_count--; + +out: + mutex_unlock(&adapter->mdev_lock); + return ret; +} + +static int ifcvf_mdev_remove(struct mdev_device *mdev) +{ + struct device *dev = mdev_parent_dev(mdev); + struct pci_dev *pdev = to_pci_dev(dev); + struct ifcvf_adapter *adapter = pci_get_drvdata(pdev); + + mutex_lock(&adapter->mdev_lock); + adapter->mdev_count++; + mutex_unlock(&adapter->mdev_lock); + + return 0; +} + +static struct mdev_parent_ops ifcvf_mdev_fops = { + .owner = THIS_MODULE, + .supported_type_groups = mdev_type_groups, + .mdev_attr_groups = mdev_dev_groups, + .create = ifcvf_mdev_create, + .remove = ifcvf_mdev_remove, +}; + +static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + struct device *dev = &pdev->dev; + struct ifcvf_adapter *adapter; + struct ifcvf_hw *vf; + int ret, i; + + adapter = kzalloc(sizeof(struct ifcvf_adapter), GFP_KERNEL); + if (adapter == NULL) { + ret = -ENOMEM; + goto fail; + } + + mutex_init(&adapter->mdev_lock); + adapter->mdev_count = 1; + adapter->dev = dev; + + pci_set_drvdata(pdev, adapter); + + ret = pci_enable_device(pdev); + if (ret) { + IFC_ERR(adapter->dev, "Failed to enable device.\n"); + goto free_adapter; + } + + ret = pci_request_regions(pdev, IFCVF_DRIVER_NAME); + if (ret) { + IFC_ERR(adapter->dev, "Failed to request MMIO region.\n"); + goto disable_device; + } + + pci_set_master(pdev); + + ret = ifcvf_init_msix(adapter); + if (ret) { + IFC_ERR(adapter->dev, "Failed to initialize MSIX.\n"); + goto free_msix; + } + + vf = &adapter->vf; + for (i = 0; i < IFCVF_PCI_MAX_RESOURCE; i++) { + vf->mem_resource[i].phys_addr = pci_resource_start(pdev, i); + vf->mem_resource[i].len = pci_resource_len(pdev, i); + if (!vf->mem_resource[i].len) { + vf->mem_resource[i].addr = NULL; + continue; + } + + vf->mem_resource[i].addr = pci_iomap_range(pdev, i, 0, + vf->mem_resource[i].len); + if (!vf->mem_resource[i].addr) { + IFC_ERR(adapter->dev, "Failed to map IO resource %d\n", + i); + return -1; + } + } + + if (ifcvf_init_hw(vf, pdev) < 0) + return -1; + + ret = mdev_register_device(dev, &ifcvf_mdev_fops); + if (ret) { + IFC_ERR(adapter->dev, "Failed to register mdev device\n"); + goto destroy_adapter; + } + + return 0; + +destroy_adapter: + ifcvf_destroy_adapter(adapter); +free_msix: + pci_free_irq_vectors(pdev); + pci_release_regions(pdev); +disable_device: + pci_disable_device(pdev); +free_adapter: + kfree(adapter); +fail: + return ret; +} + +static void ifcvf_remove(struct pci_dev *pdev) +{ + struct device *dev = &pdev->dev; + struct ifcvf_adapter *adapter = pci_get_drvdata(pdev); + struct ifcvf_hw *vf; + int i; + + mdev_unregister_device(dev); + + vf = &adapter->vf; + for (i = 0; i < IFCVF_PCI_MAX_RESOURCE; i++) { + if (vf->mem_resource[i].addr) { + pci_iounmap(pdev, vf->mem_resource[i].addr); + vf->mem_resource[i].addr = NULL; + } + } + + ifcvf_destroy_adapter(adapter); + pci_free_irq_vectors(pdev); + + pci_release_regions(pdev); + pci_disable_device(pdev); + + kfree(adapter); +} + +static struct pci_device_id ifcvf_pci_ids[] = { + { PCI_DEVICE_SUB(IFCVF_VENDOR_ID, + IFCVF_DEVICE_ID, + IFCVF_SUBSYS_VENDOR_ID, + IFCVF_SUBSYS_DEVICE_ID) }, + { 0 }, +}; +MODULE_DEVICE_TABLE(pci, ifcvf_pci_ids); + +static struct pci_driver ifcvf_driver = { + .name = IFCVF_DRIVER_NAME, + .id_table = ifcvf_pci_ids, + .probe = ifcvf_probe, + .remove = ifcvf_remove, +}; + +static int __init ifcvf_init_module(void) +{ + int ret; + + ret = pci_register_driver(&ifcvf_driver); + return ret; +} + +static void __exit ifcvf_exit_module(void) +{ + pci_unregister_driver(&ifcvf_driver); +} + +module_init(ifcvf_init_module); +module_exit(ifcvf_exit_module); + +MODULE_LICENSE("GPL v2"); +MODULE_VERSION(VERSION_STRING); +MODULE_AUTHOR(DRIVER_AUTHOR);