new file mode 100644
@@ -0,0 +1,326 @@
+// 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 > 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\n",
+ 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_DBG(&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_DBG(&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_DBG(&dev->dev, "hw->isr = %p\n", hw->isr);
+ break;
+ case VIRTIO_PCI_CAP_DEVICE_CFG:
+ hw->net_cfg = get_cap_addr(hw, &cap);
+ IFC_DBG(&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->vring->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)
+{
+ return ioread8(&hw->common_cfg->device_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 virtio_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 virtio_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((u32)features, &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 ifcvf_lm_cfg __iomem *ifcvf_lm;
+ struct virtio_pci_common_cfg *cfg;
+ struct ifcvf_adapter *ifcvf;
+ u32 __iomem* idx_addr;
+ u32 i, val;
+
+ ifcvf_lm = (struct ifcvf_lm_cfg*)hw->lm_cfg;
+ ifcvf = container_of(hw, struct ifcvf_adapter, vf);
+ cfg = hw->common_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++) {
+ if (!hw->vring[i].ready)
+ break;
+
+ 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);
+ idx_addr = &(ifcvf_lm->vring_lm_cfg[i/IFCVF_MAX_QUEUES].idx_addr[i%IFCVF_MAX_QUEUES]);
+ val = (u32)hw->vring[i].last_avail_idx |
+ ((u32)hw->vring[i].last_used_idx << 16);
+ iowrite32(val, idx_addr);
+ 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);
+ }
+
+ ioread16(&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->vring->notify_addr[qid]);
+}
new file mode 100644
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2019 Intel Corporation.
+ */
+
+#ifndef _IFCVF_H_
+#define _IFCVF_H_
+
+#include <linux/mdev_virtio_ops.h>
+#include <linux/mdev.h>
+#include <linux/pci.h>
+#include <linux/pci_regs.h>
+#include <uapi/linux/virtio_net.h>
+#include <uapi/linux/virtio_config.h>
+#include <uapi/linux/virtio_pci.h>
+
+#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
+
+#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_F_IOMMU_PLATFORM) | \
+ (1ULL << VIRTIO_NET_F_MRG_RXBUF) | \
+
+/* 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_QUEUE_MAX 32 * 1024
+#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_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];
+ u16 __iomem *notify_addr[IFCVF_MAX_QUEUE_PAIRS * 2];
+ struct virtio_mdev_callback cb;
+};
+
+struct ifcvf_hw {
+ u8 *isr;
+ /* Bar to nofity the VF (queue) */
+ u8 notify_bar;
+ /* live migration */
+ u8 __iomem *lm_cfg;
+ u8 nr_vring;
+ /* Notificaiton bar address*/
+ u16 *notify_base;
+ u32 notify_off_multiplier;
+ u64 req_features;
+ struct virtio_pci_common_cfg __iomem *common_cfg;
+ struct virtio_net_config __iomem *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;
+};
+
+struct ifcvf_vring_lm_cfg {
+ u32 idx_addr[2];
+ u8 reserved[IFCVF_LM_CFG_SIZE - 8];
+};
+
+struct ifcvf_lm_cfg {
+ u8 reserved[IFCVF_LM_RING_STATE_OFFSET];
+ struct ifcvf_vring_lm_cfg vring_lm_cfg[IFCVF_MAX_QUEUE_PAIRS];
+};
+
+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);
+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_ */
Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com> --- drivers/vhost/ifcvf/ifcvf_base.c | 326 +++++++++++++++++++++++++++++++++++++++ drivers/vhost/ifcvf/ifcvf_base.h | 129 ++++++++++++++++ 2 files changed, 455 insertions(+) create mode 100644 drivers/vhost/ifcvf/ifcvf_base.c create mode 100644 drivers/vhost/ifcvf/ifcvf_base.h