From patchwork Tue Nov 5 09:37:39 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhu, Lingshan" X-Patchwork-Id: 11227405 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 3292B1747 for ; Tue, 5 Nov 2019 09:39:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 078772190F for ; Tue, 5 Nov 2019 09:39:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730965AbfKEJjz (ORCPT ); Tue, 5 Nov 2019 04:39:55 -0500 Received: from mga02.intel.com ([134.134.136.20]:24242 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730630AbfKEJjy (ORCPT ); Tue, 5 Nov 2019 04:39:54 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Nov 2019 01:39:53 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,270,1569308400"; d="scan'208";a="200323055" Received: from unknown (HELO localhost.localdomain.bj.intel.com) ([10.240.193.79]) by fmsmga008.fm.intel.com with ESMTP; 05 Nov 2019 01:39:51 -0800 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, Zhu Lingshan Subject: [PATCH 1/2] IFC hardware operation layer Date: Tue, 5 Nov 2019 17:37:39 +0800 Message-Id: <1572946660-26265-2-git-send-email-lingshan.zhu@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1572946660-26265-1-git-send-email-lingshan.zhu@intel.com> References: <1572946660-26265-1-git-send-email-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 hardware operations and configurations. Signed-off-by: Zhu Lingshan --- drivers/vhost/ifcvf/ifcvf_base.c | 344 +++++++++++++++++++++++++++++++++++++++ drivers/vhost/ifcvf/ifcvf_base.h | 132 +++++++++++++++ 2 files changed, 476 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 0000000..0659f41 --- /dev/null +++ b/drivers/vhost/ifcvf/ifcvf_base.c @@ -0,0 +1,344 @@ +// 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) +{ + struct ifcvf_adapter *ifcvf; + u32 length, offset; + u8 bar; + + length = le32_to_cpu(cap->length); + offset = le32_to_cpu(cap->offset); + bar = le32_to_cpu(cap->bar); + + ifcvf = container_of(hw, struct ifcvf_adapter, vf); + + if (bar >= IFCVF_PCI_MAX_RESOURCE) { + IFC_DBG(ifcvf->dev, + "Invalid bar number %u to get capabilities.\n", bar); + return NULL; + } + + if (offset + length < offset) { + IFC_DBG(ifcvf->dev, "offset(%u) + length(%u) overflows\n", + offset, length); + return NULL; + } + + if (offset + length > hw->mem_resource[cap->bar].len) { + IFC_DBG(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 ret, i; + + for (i = 0; i < size; i += 4) { + ret = pci_read_config_dword(dev, where + i, val + i / 4); + if (ret < 0) + return ret; + } + + return 0; +} + +int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *dev) +{ + struct virtio_pci_cap cap; + u16 notify_off; + int ret; + u8 pos; + u32 i; + + 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_DBG(&dev->dev, "read PCI config: config type: %u, PCI bar: %u,\ + PCI bar offset: %u, 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->net_cfg = get_cap_addr(hw, &cap); + IFC_INFO(&dev->dev, "hw->net_cfg = %p.\n", hw->net_cfg); + break; + } +next: + pos = cap.cap_next; + } + + if (hw->common_cfg == NULL || hw->notify_base == NULL || + hw->isr == NULL || hw->net_cfg == NULL) { + IFC_DBG(&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[IFCVF_LM_BAR].addr; + + IFC_DBG(&dev->dev, "PCI capability mapping: common cfg: %p,\ + notify base: %p\n, isr cfg: %p, device cfg: %p,\ + multiplier: %u\n", + hw->common_cfg, hw->notify_base, hw->isr, + hw->net_cfg, hw->notify_off_multiplier); + + return 0; +} + +u8 ifcvf_get_status(struct ifcvf_hw *hw) +{ + u8 old_gen, new_gen, status; + + do { + old_gen = ioread8(&hw->common_cfg->config_generation); + status = ioread8(&hw->common_cfg->device_status); + new_gen = ioread8(&hw->common_cfg->config_generation); + } while (old_gen != new_gen); + + return status; +} + +void ifcvf_set_status(struct ifcvf_hw *hw, u8 status) +{ + iowrite8(status, &hw->common_cfg->device_status); +} + +void ifcvf_reset(struct ifcvf_hw *hw) +{ + ifcvf_set_status(hw, 0); + ifcvf_get_status(hw); +} + +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) +{ + struct virtio_pci_common_cfg *cfg = hw->common_cfg; + u32 features_lo, features_hi; + + 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; +} + +void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset, + void *dst, int length) +{ + u8 old_gen, new_gen, *p; + int i; + + WARN_ON(offset + length > sizeof (struct ifcvf_net_config)); + + do { + old_gen = ioread8(&hw->common_cfg->config_generation); + p = dst; + + for (i = 0; i < length; i++) + *p++ = ioread8((u8 *)hw->net_cfg + offset + i); + + new_gen = ioread8(&hw->common_cfg->config_generation); + } while (old_gen != new_gen); +} + +void ifcvf_write_net_config(struct ifcvf_hw *hw, u64 offset, + const void *src, int length) +{ + const u8 *p; + int i; + + p = src; + WARN_ON(offset + length > sizeof (struct ifcvf_net_config)); + + for (i = 0; i < length; i++) + iowrite8(*p++, (u8 *)hw->net_cfg + offset + i); +} + +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) +{ + struct ifcvf_adapter *ifcvf; + + ifcvf = container_of(hw, struct ifcvf_adapter, vf); + 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; +} + +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; + struct ifcvf_adapter *ifcvf; + u8 *lm_cfg; + u32 i; + + 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) +{ + struct virtio_pci_common_cfg *cfg; + u32 i; + + 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_notify_queue(struct ifcvf_hw *hw, u16 qid) +{ + iowrite16(qid, hw->notify_addr[qid]); +} + +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 0000000..c97f0eb --- /dev/null +++ b/drivers/vhost/ifcvf/ifcvf_base.h @@ -0,0 +1,132 @@ +/* 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 +#include + +#define IFCVF_VENDOR_ID 0x1AF4 +#define IFCVF_DEVICE_ID 0x1041 +#define IFCVF_SUBSYS_VENDOR_ID 0x8086 +#define IFCVF_SUBSYS_DEVICE_ID 0x001A + +#define IFCVF_MDEV_LIMIT 1 + +/* + * 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 << VIRTIO_F_ORDER_PLATFORM) | \ + (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 */ + +//Not support MQ, only one queue pair for now. +#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 + +#define IFCVF_LM_CFG_SIZE 0x40 +#define IFCVF_LM_RING_STATE_OFFSET 0x20 +#define IFCVF_LM_BAR 4 + +#define IFCVF_32_BIT_MASK 0xffffffff + +#define IFC_ERR(dev, fmt, ...) dev_err(dev, fmt, ##__VA_ARGS__) +#define IFC_DBG(dev, fmt, ...) dev_dbg(dev, fmt, ##__VA_ARGS__) +#define IFC_INFO(dev, fmt, ...) dev_info(dev, fmt, ##__VA_ARGS__) + +#define IFC_PRIVATE_TO_VF(adapter) \ + (&((struct ifcvf_adapter *)adapter)->vf) + +#define IFCVF_MAX_INTR (IFCVF_MAX_QUEUE_PAIRS * 2 + 1) + +struct ifcvf_net_config { + u8 mac[6]; + u16 status; + u16 max_virtqueue_pairs; +} __packed; + +struct ifcvf_pci_mem_resource { + /* Physical address, 0 if not resource. */ + u64 phys_addr; + /* Length of the resource. */ + u64 len; + /* Virtual address, NULL when not mapped. */ + u8 *addr; +}; + +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 nr_vring; + u16 *notify_base; + u16 *notify_addr[IFCVF_MAX_QUEUE_PAIRS * 2]; + u32 notify_off_multiplier; + u64 req_features; + struct virtio_pci_common_cfg *common_cfg; + struct ifcvf_net_config *net_cfg; + struct vring_info vring[IFCVF_MAX_QUEUE_PAIRS * 2]; + struct ifcvf_pci_mem_resource mem_resource[IFCVF_PCI_MAX_RESOURCE]; +}; + +struct ifcvf_adapter { + struct device *dev; + struct mutex mdev_lock; + int mdev_count; + int vectors; + struct ifcvf_hw vf; +}; + +int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *dev); +int ifcvf_start_hw(struct ifcvf_hw *hw); +void ifcvf_stop_hw(struct ifcvf_hw *hw); +void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid); +u8 ifcvf_get_linkstatus(struct ifcvf_hw *hw); +void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset, + void *dst, int length); +void ifcvf_write_net_config(struct ifcvf_hw *hw, u64 offset, + const void *src, int length); +u8 ifcvf_get_status(struct ifcvf_hw *hw); +void ifcvf_set_status(struct ifcvf_hw *hw, u8 status); +void io_write64_twopart(u64 val, u32 *lo, u32 *hi); +void ifcvf_reset(struct ifcvf_hw *hw); +u64 ifcvf_get_features(struct ifcvf_hw *hw); + +#endif /* _IFCVF_H_ */