From patchwork Wed Oct 16 01:30:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhu, Lingshan" X-Patchwork-Id: 11192197 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 DCCA114DB for ; Wed, 16 Oct 2019 01:31:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B34092067D for ; Wed, 16 Oct 2019 01:31:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389151AbfJPBbM (ORCPT ); Tue, 15 Oct 2019 21:31:12 -0400 Received: from mga17.intel.com ([192.55.52.151]:60917 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726786AbfJPBbL (ORCPT ); Tue, 15 Oct 2019 21:31:11 -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 fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Oct 2019 18:31:10 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,302,1566889200"; d="scan'208";a="279378817" 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 18:31:01 -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 1/2] vhost: IFC VF hardware operation layer Date: Wed, 16 Oct 2019 09:30:49 +0800 Message-Id: <20191016013050.3918-2-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 ifcvf_base layer, which handles IFC VF NIC hardware operations and configurations. Signed-off-by: Zhu Lingshan --- drivers/vhost/ifcvf/ifcvf_base.c | 390 +++++++++++++++++++++++++++++++++++++++ drivers/vhost/ifcvf/ifcvf_base.h | 137 ++++++++++++++ 2 files changed, 527 insertions(+) create mode 100644 drivers/vhost/ifcvf/ifcvf_base.c create mode 100644 drivers/vhost/ifcvf/ifcvf_base.h diff --git a/drivers/vhost/ifcvf/ifcvf_base.c b/drivers/vhost/ifcvf/ifcvf_base.c new file mode 100644 index 000000000000..b85e14c9bdcf --- /dev/null +++ b/drivers/vhost/ifcvf/ifcvf_base.c @@ -0,0 +1,390 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2019 Intel Corporation. + */ + +#include "ifcvf_base.h" + +static void *get_cap_addr(struct ifcvf_hw *hw, struct virtio_pci_cap *cap) +{ + u8 bar = cap->bar; + u32 length = cap->length; + u32 offset = cap->offset; + struct ifcvf_adapter *ifcvf = + container_of(hw, struct ifcvf_adapter, vf); + + if (bar >= IFCVF_PCI_MAX_RESOURCE) { + IFC_ERR(ifcvf->dev, + "Invalid bar number %u to get capabilities.\n", bar); + return NULL; + } + + if (offset + length < offset) { + IFC_ERR(ifcvf->dev, "offset(%u) + length(%u) overflows\n", + offset, length); + return NULL; + } + + if (offset + length > hw->mem_resource[cap->bar].len) { + IFC_ERR(ifcvf->dev, + "offset(%u) + len(%u) overflows bar%u to get capabilities.\n", + offset, length, bar); + return NULL; + } + + return hw->mem_resource[bar].addr + offset; +} + +int ifcvf_read_config_range(struct pci_dev *dev, + uint32_t *val, int size, int where) +{ + int i; + + for (i = 0; i < size; i += 4) { + if (pci_read_config_dword(dev, where + i, val + i / 4) < 0) + return -1; + } + return 0; +} + +int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *dev) +{ + int ret; + u8 pos; + struct virtio_pci_cap cap; + u32 i; + u16 notify_off; + + ret = pci_read_config_byte(dev, PCI_CAPABILITY_LIST, &pos); + + if (ret < 0) { + IFC_ERR(&dev->dev, "failed to read PCI capability list.\n"); + return -EIO; + } + + while (pos) { + ret = ifcvf_read_config_range(dev, (u32 *)&cap, + sizeof(cap), pos); + + if (ret < 0) { + IFC_ERR(&dev->dev, "failed to get PCI capability at %x", + pos); + break; + } + + if (cap.cap_vndr != PCI_CAP_ID_VNDR) + goto next; + + IFC_INFO(&dev->dev, "read PCI config:\n" + "config type: %u.\n" + "PCI bar: %u.\n" + "PCI bar offset: %u.\n" + "PCI config len: %u.\n", + cap.cfg_type, cap.bar, + cap.offset, cap.length); + + switch (cap.cfg_type) { + case VIRTIO_PCI_CAP_COMMON_CFG: + hw->common_cfg = get_cap_addr(hw, &cap); + IFC_INFO(&dev->dev, "hw->common_cfg = %p.\n", + hw->common_cfg); + break; + case VIRTIO_PCI_CAP_NOTIFY_CFG: + pci_read_config_dword(dev, pos + sizeof(cap), + &hw->notify_off_multiplier); + hw->notify_bar = cap.bar; + hw->notify_base = get_cap_addr(hw, &cap); + IFC_INFO(&dev->dev, "hw->notify_base = %p.\n", + hw->notify_base); + break; + case VIRTIO_PCI_CAP_ISR_CFG: + hw->isr = get_cap_addr(hw, &cap); + IFC_INFO(&dev->dev, "hw->isr = %p.\n", hw->isr); + break; + case VIRTIO_PCI_CAP_DEVICE_CFG: + hw->dev_cfg = get_cap_addr(hw, &cap); + IFC_INFO(&dev->dev, "hw->dev_cfg = %p.\n", hw->dev_cfg); + break; + } +next: + pos = cap.cap_next; + } + + if (hw->common_cfg == NULL || hw->notify_base == NULL || + hw->isr == NULL || hw->dev_cfg == NULL) { + IFC_ERR(&dev->dev, "Incomplete PCI capabilities.\n"); + return -1; + } + + for (i = 0; i < (IFCVF_MAX_QUEUE_PAIRS * 2); i++) { + iowrite16(i, &hw->common_cfg->queue_select); + notify_off = ioread16(&hw->common_cfg->queue_notify_off); + hw->notify_addr[i] = (void *)((u8 *)hw->notify_base + + notify_off * hw->notify_off_multiplier); + } + + hw->lm_cfg = hw->mem_resource[4].addr; + + IFC_INFO(&dev->dev, "PCI capability mapping:\n" + "common cfg: %p\n" + "notify base: %p\n" + "isr cfg: %p\n" + "device cfg: %p\n" + "multiplier: %u\n", + hw->common_cfg, + hw->notify_base, + hw->isr, + hw->dev_cfg, + hw->notify_off_multiplier); + + return 0; +} + +static u8 ifcvf_get_status(struct ifcvf_hw *hw) +{ + return ioread8(&hw->common_cfg->device_status); +} + +static void ifcvf_set_status(struct ifcvf_hw *hw, u8 status) +{ + iowrite8(status, &hw->common_cfg->device_status); +} + +static void ifcvf_reset(struct ifcvf_hw *hw) +{ + ifcvf_set_status(hw, 0); + + /* flush status write */ + ifcvf_get_status(hw); + hw->generation++; +} + +static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status) +{ + if (status != 0) + status |= ifcvf_get_status(hw); + + ifcvf_set_status(hw, status); + ifcvf_get_status(hw); +} + +u64 ifcvf_get_features(struct ifcvf_hw *hw) +{ + u32 features_lo, features_hi; + struct virtio_pci_common_cfg *cfg = hw->common_cfg; + + iowrite32(0, &cfg->device_feature_select); + features_lo = ioread32(&cfg->device_feature); + + iowrite32(1, &cfg->device_feature_select); + features_hi = ioread32(&cfg->device_feature); + + return ((u64)features_hi << 32) | features_lo; +} +static int ifcvf_with_feature(struct ifcvf_hw *hw, u64 bit) +{ + return (hw->req_features & (1ULL << bit)) != 0; +} + +static void ifcvf_read_dev_config(struct ifcvf_hw *hw, u64 offset, + void *dst, int length) +{ + int i; + u8 *p; + u8 old_gen, new_gen; + + do { + old_gen = ioread8(&hw->common_cfg->config_generation); + + p = dst; + for (i = 0; i < length; i++) + *p++ = ioread8((u8 *)hw->dev_cfg + offset + i); + + new_gen = ioread8(&hw->common_cfg->config_generation); + } while (old_gen != new_gen); +} + +void ifcvf_get_linkstatus(struct ifcvf_hw *hw, u8 *is_linkup) +{ + u16 status; + u64 host_features; + + host_features = ifcvf_get_features(hw); + if (ifcvf_with_feature(hw, VIRTIO_NET_F_STATUS)) { + ifcvf_read_dev_config(hw, + offsetof(struct ifcvf_net_config, status), + &status, sizeof(status)); + if ((status & VIRTIO_NET_S_LINK_UP) == 0) + (*is_linkup) = 1; + else + (*is_linkup) = 0; + } else + (*is_linkup) = 0; +} + +static void ifcvf_set_features(struct ifcvf_hw *hw, u64 features) +{ + struct virtio_pci_common_cfg *cfg = hw->common_cfg; + + iowrite32(0, &cfg->guest_feature_select); + iowrite32(features & ((1ULL << 32) - 1), &cfg->guest_feature); + + iowrite32(1, &cfg->guest_feature_select); + iowrite32(features >> 32, &cfg->guest_feature); +} + +static int ifcvf_config_features(struct ifcvf_hw *hw) +{ + u64 host_features; + struct ifcvf_adapter *ifcvf = + container_of(hw, struct ifcvf_adapter, vf); + + host_features = ifcvf_get_features(hw); + hw->req_features &= host_features; + + ifcvf_set_features(hw, hw->req_features); + ifcvf_add_status(hw, VIRTIO_CONFIG_S_FEATURES_OK); + + if (!(ifcvf_get_status(hw) & VIRTIO_CONFIG_S_FEATURES_OK)) { + IFC_ERR(ifcvf->dev, "Failed to set FEATURES_OK status\n"); + return -EIO; + } + + return 0; +} + +static void io_write64_twopart(u64 val, u32 *lo, u32 *hi) +{ + iowrite32(val & ((1ULL << 32) - 1), lo); + iowrite32(val >> 32, hi); +} + +static int ifcvf_hw_enable(struct ifcvf_hw *hw) +{ + struct virtio_pci_common_cfg *cfg; + u8 *lm_cfg; + u32 i; + struct ifcvf_adapter *ifcvf = + container_of(hw, struct ifcvf_adapter, vf); + + cfg = hw->common_cfg; + lm_cfg = hw->lm_cfg; + + iowrite16(IFCVF_MSI_CONFIG_OFF, &cfg->msix_config); + if (ioread16(&cfg->msix_config) == VIRTIO_MSI_NO_VECTOR) { + IFC_ERR(ifcvf->dev, "No msix vector for device config.\n"); + return -1; + } + + for (i = 0; i < hw->nr_vring; i++) { + iowrite16(i, &cfg->queue_select); + io_write64_twopart(hw->vring[i].desc, &cfg->queue_desc_lo, + &cfg->queue_desc_hi); + io_write64_twopart(hw->vring[i].avail, &cfg->queue_avail_lo, + &cfg->queue_avail_hi); + io_write64_twopart(hw->vring[i].used, &cfg->queue_used_lo, + &cfg->queue_used_hi); + iowrite16(hw->vring[i].size, &cfg->queue_size); + + *(u32 *)(lm_cfg + IFCVF_LM_RING_STATE_OFFSET + + (i / 2) * IFCVF_LM_CFG_SIZE + (i % 2) * 4) = + (u32)hw->vring[i].last_avail_idx | + ((u32)hw->vring[i].last_used_idx << 16); + + iowrite16(i + IFCVF_MSI_QUEUE_OFF, &cfg->queue_msix_vector); + if (ioread16(&cfg->queue_msix_vector) == + VIRTIO_MSI_NO_VECTOR) { + IFC_ERR(ifcvf->dev, + "No msix vector for queue %u.\n", i); + return -1; + } + + iowrite16(1, &cfg->queue_enable); + } + + return 0; +} + +static void ifcvf_hw_disable(struct ifcvf_hw *hw) +{ + u32 i; + struct virtio_pci_common_cfg *cfg; + + cfg = hw->common_cfg; + + iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->msix_config); + for (i = 0; i < hw->nr_vring; i++) { + iowrite16(i, &cfg->queue_select); + iowrite16(0, &cfg->queue_enable); + iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->queue_msix_vector); + } +} + +int ifcvf_start_hw(struct ifcvf_hw *hw) +{ + ifcvf_reset(hw); + ifcvf_add_status(hw, VIRTIO_CONFIG_S_ACKNOWLEDGE); + ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER); + + if (ifcvf_config_features(hw) < 0) + return -1; + + if (ifcvf_hw_enable(hw) < 0) + return -1; + + ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER_OK); + + return 0; +} + +void ifcvf_stop_hw(struct ifcvf_hw *hw) +{ + ifcvf_hw_disable(hw); + ifcvf_reset(hw); +} + +void ifcvf_enable_logging_vf(struct ifcvf_hw *hw, u64 log_base, u64 log_size) +{ + u8 *lm_cfg; + + lm_cfg = hw->lm_cfg; + + *(u32 *)(lm_cfg + IFCVF_LM_BASE_ADDR_LOW) = + log_base & IFCVF_32_BIT_MASK; + + *(u32 *)(lm_cfg + IFCVF_LM_BASE_ADDR_HIGH) = + (log_base >> 32) & IFCVF_32_BIT_MASK; + + *(u32 *)(lm_cfg + IFCVF_LM_END_ADDR_LOW) = + (log_base + log_size) & IFCVF_32_BIT_MASK; + + *(u32 *)(lm_cfg + IFCVF_LM_END_ADDR_HIGH) = + ((log_base + log_size) >> 32) & IFCVF_32_BIT_MASK; + + *(u32 *)(lm_cfg + IFCVF_LM_LOGGING_CTRL) = IFCVF_LM_ENABLE_VF; +} + +void ifcvf_disable_logging(struct ifcvf_hw *hw) +{ + u8 *lm_cfg; + + lm_cfg = hw->lm_cfg; + *(u32 *)(lm_cfg + IFCVF_LM_LOGGING_CTRL) = IFCVF_LM_DISABLE; +} + +void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid) +{ + + iowrite16(qid, hw->notify_addr[qid]); +} + +u8 ifcvf_get_notify_region(struct ifcvf_hw *hw) +{ + return hw->notify_bar; +} + +u64 ifcvf_get_queue_notify_off(struct ifcvf_hw *hw, int qid) +{ + return (u8 *)hw->notify_addr[qid] - + (u8 *)hw->mem_resource[hw->notify_bar].addr; +} diff --git a/drivers/vhost/ifcvf/ifcvf_base.h b/drivers/vhost/ifcvf/ifcvf_base.h new file mode 100644 index 000000000000..1ab1a1c40f24 --- /dev/null +++ b/drivers/vhost/ifcvf/ifcvf_base.h @@ -0,0 +1,137 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* + * Copyright (C) 2019 Intel Corporation. + */ + +#ifndef _IFCVF_H_ +#define _IFCVF_H_ + +#include +#include +#include +#include +#include +#include + +#define IFCVF_VENDOR_ID 0x1AF4 +#define IFCVF_DEVICE_ID 0x1041 +#define IFCVF_SUBSYS_VENDOR_ID 0x8086 +#define IFCVF_SUBSYS_DEVICE_ID 0x001A + +/* + * Some ifcvf feature bits (currently bits 28 through 31) are + * reserved for the transport being used (eg. ifcvf_ring), the + * rest are per-device feature bits. + */ +#define IFCVF_TRANSPORT_F_START 28 +#define IFCVF_TRANSPORT_F_END 34 + +#define IFC_SUPPORTED_FEATURES \ + ((1ULL << VIRTIO_NET_F_MAC) | \ + (1ULL << VIRTIO_F_ANY_LAYOUT) | \ + (1ULL << VIRTIO_F_VERSION_1) | \ + (1ULL << VHOST_F_LOG_ALL) | \ + (1ULL << VIRTIO_NET_F_GUEST_ANNOUNCE) | \ + (1ULL << VIRTIO_NET_F_CTRL_VQ) | \ + (1ULL << VIRTIO_NET_F_STATUS) | \ + (1ULL << VIRTIO_NET_F_MRG_RXBUF)) /* not fully supported */ + +#define IFCVF_MAX_QUEUE_PAIRS 1 +#define IFCVF_MAX_QUEUES 2 + +#define IFCVF_QUEUE_ALIGNMENT PAGE_SIZE + +#define IFCVF_MSI_CONFIG_OFF 0 +#define IFCVF_MSI_QUEUE_OFF 1 +#define IFCVF_PCI_MAX_RESOURCE 6 + +/* 46 bit CPU physical address, avoid overlap */ +#define LM_IOVA 0x400000000000 + +#define IFCVF_LM_CFG_SIZE 0x40 +#define IFCVF_LM_RING_STATE_OFFSET 0x20 + +#define IFCVF_LM_LOGGING_CTRL 0x0 + +#define IFCVF_LM_BASE_ADDR_LOW 0x10 +#define IFCVF_LM_BASE_ADDR_HIGH 0x14 +#define IFCVF_LM_END_ADDR_LOW 0x18 +#define IFCVF_LM_END_ADDR_HIGH 0x1c + +#define IFCVF_LM_DISABLE 0x0 +#define IFCVF_LM_ENABLE_VF 0x1 +#define IFCVF_LM_ENABLE_PF 0x3 + +#define IFCVF_32_BIT_MASK 0xffffffff + +#define IFC_ERR(dev, fmt, ...) dev_err(dev, fmt, ##__VA_ARGS__) +#define IFC_INFO(dev, fmt, ...) dev_info(dev, fmt, ##__VA_ARGS__) + +struct ifcvf_net_config { + u8 mac[6]; + u16 status; + u16 max_virtqueue_pairs; +} __packed; + +struct ifcvf_pci_mem_resource { + u64 phys_addr; /**< Physical address, 0 if not resource. */ + u64 len; /**< Length of the resource. */ + u8 *addr; /**< Virtual address, NULL when not mapped. */ +}; + +struct vring_info { + u64 desc; + u64 avail; + u64 used; + u16 size; + u16 last_avail_idx; + u16 last_used_idx; + bool ready; + char msix_name[256]; + struct virtio_mdev_callback cb; +}; + +struct ifcvf_hw { + u8 *isr; + u8 notify_bar; + u8 *lm_cfg; + u8 status; + u8 nr_vring; + u16 *notify_base; + u16 *notify_addr[IFCVF_MAX_QUEUE_PAIRS * 2]; + u32 generation; + u32 notify_off_multiplier; + u64 req_features; + struct virtio_pci_common_cfg *common_cfg; + struct ifcvf_net_config *dev_cfg; + struct vring_info vring[IFCVF_MAX_QUEUE_PAIRS * 2]; + struct ifcvf_pci_mem_resource mem_resource[IFCVF_PCI_MAX_RESOURCE]; +}; + +#define IFC_PRIVATE_TO_VF(adapter) \ + (&((struct ifcvf_adapter *)adapter)->vf) + +#define IFCVF_MAX_INTR (IFCVF_MAX_QUEUE_PAIRS * 2 + 1) + +struct ifcvf_adapter { + struct device *dev; + struct mutex mdev_lock; + int mdev_count; + struct list_head dma_maps; + int vectors; + struct ifcvf_hw vf; +}; + +int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *dev); +u64 ifcvf_get_features(struct ifcvf_hw *hw); +int ifcvf_start_hw(struct ifcvf_hw *hw); +void ifcvf_stop_hw(struct ifcvf_hw *hw); +void ifcvf_enable_logging(struct ifcvf_hw *hw, u64 log_base, u64 log_size); +void ifcvf_enable_logging_vf(struct ifcvf_hw *hw, u64 log_base, u64 log_size); +void ifcvf_disable_logging(struct ifcvf_hw *hw); +void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid); +void ifcvf_get_linkstatus(struct ifcvf_hw *hw, u8 *is_linkup); +u8 ifcvf_get_notify_region(struct ifcvf_hw *hw); +u64 ifcvf_get_queue_notify_off(struct ifcvf_hw *hw, int qid); + +#endif /* _IFCVF_H_ */ 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);