// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved */ #include <linux/virtio_pci_admin.h> #include "virtio_pci_common.h" /* * virtio_pci_admin_has_legacy_io - Checks whether the legacy IO * commands are supported * @dev: VF pci_dev * * Returns true on success. */ bool virtio_pci_admin_has_legacy_io(struct pci_dev *pdev) { struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev); struct virtio_pci_device *vp_dev; if (!virtio_dev) return false; if (!virtio_has_feature(virtio_dev, VIRTIO_F_ADMIN_VQ)) return false; vp_dev = to_vp_device(virtio_dev); if ((vp_dev->admin_vq.supported_cmds & VIRTIO_LEGACY_ADMIN_CMD_BITMAP) == VIRTIO_LEGACY_ADMIN_CMD_BITMAP) return true; return false; } EXPORT_SYMBOL_GPL(virtio_pci_admin_has_legacy_io); static int virtio_pci_admin_legacy_io_write(struct pci_dev *pdev, u16 opcode, u8 offset, u8 size, u8 *buf) { struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev); struct virtio_admin_cmd_legacy_wr_data *data; struct virtio_admin_cmd cmd = {}; struct scatterlist data_sg; int vf_id; int ret; if (!virtio_dev) return -ENODEV; vf_id = pci_iov_vf_id(pdev); if (vf_id < 0) return vf_id; data = kzalloc(sizeof(*data) + size, GFP_KERNEL); if (!data) return -ENOMEM; data->offset = offset; memcpy(data->registers, buf, size); sg_init_one(&data_sg, data, sizeof(*data) + size); cmd.opcode = cpu_to_le16(opcode); cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV); cmd.group_member_id = cpu_to_le64(vf_id + 1); cmd.data_sg = &data_sg; ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd); kfree(data); return ret; } /* * virtio_pci_admin_legacy_io_write_common - Write legacy common configuration * of a member device * @dev: VF pci_dev * @offset: starting byte offset within the common configuration area to write to * @size: size of the data to write * @buf: buffer which holds the data * * Note: caller must serialize access for the given device. * Returns 0 on success, or negative on failure. */ int virtio_pci_admin_legacy_common_io_write(struct pci_dev *pdev, u8 offset, u8 size, u8 *buf) { return virtio_pci_admin_legacy_io_write(pdev, VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_WRITE, offset, size, buf); } EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_common_io_write); /* * virtio_pci_admin_legacy_io_write_device - Write legacy device configuration * of a member device * @dev: VF pci_dev * @offset: starting byte offset within the device configuration area to write to * @size: size of the data to write * @buf: buffer which holds the data * * Note: caller must serialize access for the given device. * Returns 0 on success, or negative on failure. */ int virtio_pci_admin_legacy_device_io_write(struct pci_dev *pdev, u8 offset, u8 size, u8 *buf) { return virtio_pci_admin_legacy_io_write(pdev, VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_WRITE, offset, size, buf); } EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_device_io_write); static int virtio_pci_admin_legacy_io_read(struct pci_dev *pdev, u16 opcode, u8 offset, u8 size, u8 *buf) { struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev); struct virtio_admin_cmd_legacy_rd_data *data; struct scatterlist data_sg, result_sg; struct virtio_admin_cmd cmd = {}; int vf_id; int ret; if (!virtio_dev) return -ENODEV; vf_id = pci_iov_vf_id(pdev); if (vf_id < 0) return vf_id; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; data->offset = offset; sg_init_one(&data_sg, data, sizeof(*data)); sg_init_one(&result_sg, buf, size); cmd.opcode = cpu_to_le16(opcode); cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV); cmd.group_member_id = cpu_to_le64(vf_id + 1); cmd.data_sg = &data_sg; cmd.result_sg = &result_sg; ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd); kfree(data); return ret; } /* * virtio_pci_admin_legacy_device_io_read - Read legacy device configuration of * a member device * @dev: VF pci_dev * @offset: starting byte offset within the device configuration area to read from * @size: size of the data to be read * @buf: buffer to hold the returned data * * Note: caller must serialize access for the given device. * Returns 0 on success, or negative on failure. */ int virtio_pci_admin_legacy_device_io_read(struct pci_dev *pdev, u8 offset, u8 size, u8 *buf) { return virtio_pci_admin_legacy_io_read(pdev, VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_READ, offset, size, buf); } EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_device_io_read); /* * virtio_pci_admin_legacy_common_io_read - Read legacy common configuration of * a member device * @dev: VF pci_dev * @offset: starting byte offset within the common configuration area to read from * @size: size of the data to be read * @buf: buffer to hold the returned data * * Note: caller must serialize access for the given device. * Returns 0 on success, or negative on failure. */ int virtio_pci_admin_legacy_common_io_read(struct pci_dev *pdev, u8 offset, u8 size, u8 *buf) { return virtio_pci_admin_legacy_io_read(pdev, VIRTIO_ADMIN_CMD_LEGACY_COMMON_CFG_READ, offset, size, buf); } EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_common_io_read); /* * virtio_pci_admin_legacy_io_notify_info - Read the queue notification * information for legacy interface * @dev: VF pci_dev * @req_bar_flags: requested bar flags * @bar: on output the BAR number of the owner or member device * @bar_offset: on output the offset within bar * * Returns 0 on success, or negative on failure. */ int virtio_pci_admin_legacy_io_notify_info(struct pci_dev *pdev, u8 req_bar_flags, u8 *bar, u64 *bar_offset) { struct virtio_device *virtio_dev = virtio_pci_vf_get_pf_dev(pdev); struct virtio_admin_cmd_notify_info_result *result; struct virtio_admin_cmd cmd = {}; struct scatterlist result_sg; int vf_id; int ret; if (!virtio_dev) return -ENODEV; vf_id = pci_iov_vf_id(pdev); if (vf_id < 0) return vf_id; result = kzalloc(sizeof(*result), GFP_KERNEL); if (!result) return -ENOMEM; sg_init_one(&result_sg, result, sizeof(*result)); cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_LEGACY_NOTIFY_INFO); cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SRIOV); cmd.group_member_id = cpu_to_le64(vf_id + 1); cmd.result_sg = &result_sg; ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd); if (!ret) { struct virtio_admin_cmd_notify_info_data *entry; int i; ret = -ENOENT; for (i = 0; i < VIRTIO_ADMIN_CMD_MAX_NOTIFY_INFO; i++) { entry = &result->entries[i]; if (entry->flags == VIRTIO_ADMIN_CMD_NOTIFY_INFO_FLAGS_END) break; if (entry->flags != req_bar_flags) continue; *bar = entry->bar; *bar_offset = le64_to_cpu(entry->offset); ret = 0; break; } } kfree(result); return ret; } EXPORT_SYMBOL_GPL(virtio_pci_admin_legacy_io_notify_info);