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e6b817d4b8
Define a new configuration entry VFIO_PCI_ZDEV for VFIO/PCI. When this s390-only feature is configured we add capabilities to the VFIO_DEVICE_GET_INFO ioctl that describe features of the associated zPCI device and its underlying hardware. This patch is based on work previously done by Pierre Morel. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* VFIO ZPCI devices support
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*
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* Copyright (C) IBM Corp. 2020. All rights reserved.
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* Author(s): Pierre Morel <pmorel@linux.ibm.com>
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* Matthew Rosato <mjrosato@linux.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/io.h>
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#include <linux/pci.h>
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#include <linux/uaccess.h>
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#include <linux/vfio.h>
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#include <linux/vfio_zdev.h>
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#include <asm/pci_clp.h>
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#include <asm/pci_io.h>
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#include "vfio_pci_private.h"
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/*
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* Add the Base PCI Function information to the device info region.
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*/
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static int zpci_base_cap(struct zpci_dev *zdev, struct vfio_pci_device *vdev,
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struct vfio_info_cap *caps)
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{
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struct vfio_device_info_cap_zpci_base cap = {
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.header.id = VFIO_DEVICE_INFO_CAP_ZPCI_BASE,
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.header.version = 1,
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.start_dma = zdev->start_dma,
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.end_dma = zdev->end_dma,
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.pchid = zdev->pchid,
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.vfn = zdev->vfn,
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.fmb_length = zdev->fmb_length,
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.pft = zdev->pft,
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.gid = zdev->pfgid
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};
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return vfio_info_add_capability(caps, &cap.header, sizeof(cap));
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}
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/*
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* Add the Base PCI Function Group information to the device info region.
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*/
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static int zpci_group_cap(struct zpci_dev *zdev, struct vfio_pci_device *vdev,
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struct vfio_info_cap *caps)
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{
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struct vfio_device_info_cap_zpci_group cap = {
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.header.id = VFIO_DEVICE_INFO_CAP_ZPCI_GROUP,
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.header.version = 1,
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.dasm = zdev->dma_mask,
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.msi_addr = zdev->msi_addr,
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.flags = VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH,
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.mui = zdev->fmb_update,
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.noi = zdev->max_msi,
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.maxstbl = ZPCI_MAX_WRITE_SIZE,
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.version = zdev->version
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};
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return vfio_info_add_capability(caps, &cap.header, sizeof(cap));
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}
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/*
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* Add the device utility string to the device info region.
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*/
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static int zpci_util_cap(struct zpci_dev *zdev, struct vfio_pci_device *vdev,
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struct vfio_info_cap *caps)
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{
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struct vfio_device_info_cap_zpci_util *cap;
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int cap_size = sizeof(*cap) + CLP_UTIL_STR_LEN;
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int ret;
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cap = kmalloc(cap_size, GFP_KERNEL);
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cap->header.id = VFIO_DEVICE_INFO_CAP_ZPCI_UTIL;
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cap->header.version = 1;
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cap->size = CLP_UTIL_STR_LEN;
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memcpy(cap->util_str, zdev->util_str, cap->size);
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ret = vfio_info_add_capability(caps, &cap->header, cap_size);
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kfree(cap);
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return ret;
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}
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/*
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* Add the function path string to the device info region.
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*/
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static int zpci_pfip_cap(struct zpci_dev *zdev, struct vfio_pci_device *vdev,
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struct vfio_info_cap *caps)
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{
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struct vfio_device_info_cap_zpci_pfip *cap;
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int cap_size = sizeof(*cap) + CLP_PFIP_NR_SEGMENTS;
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int ret;
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cap = kmalloc(cap_size, GFP_KERNEL);
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cap->header.id = VFIO_DEVICE_INFO_CAP_ZPCI_PFIP;
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cap->header.version = 1;
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cap->size = CLP_PFIP_NR_SEGMENTS;
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memcpy(cap->pfip, zdev->pfip, cap->size);
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ret = vfio_info_add_capability(caps, &cap->header, cap_size);
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kfree(cap);
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return ret;
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}
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/*
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* Add all supported capabilities to the VFIO_DEVICE_GET_INFO capability chain.
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*/
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int vfio_pci_info_zdev_add_caps(struct vfio_pci_device *vdev,
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struct vfio_info_cap *caps)
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{
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struct zpci_dev *zdev = to_zpci(vdev->pdev);
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int ret;
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if (!zdev)
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return -ENODEV;
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ret = zpci_base_cap(zdev, vdev, caps);
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if (ret)
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return ret;
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ret = zpci_group_cap(zdev, vdev, caps);
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if (ret)
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return ret;
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if (zdev->util_str_avail) {
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ret = zpci_util_cap(zdev, vdev, caps);
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if (ret)
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return ret;
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}
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ret = zpci_pfip_cap(zdev, vdev, caps);
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return ret;
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}
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