ba6090ff8a
When doing load/store interpretation, the maximum store block length is determined by the underlying firmware, not the host kernel API. Reflect that in the associated Query PCI Function Group clp capability and let userspace decide which is appropriate to present to the guest. Reviewed-by: Pierre Morel <pmorel@linux.ibm.com> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Acked-by: Alex Williamson <alex.williamson@redhat.com> Link: https://lore.kernel.org/r/20220606203325.110625-20-mjrosato@linux.ibm.com Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
165 lines
3.7 KiB
C
165 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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#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 <linux/kvm_host.h>
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#include <asm/pci_clp.h>
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#include <asm/pci_io.h>
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#include <linux/vfio_pci_core.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_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 = 2,
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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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.fh = zdev->fh
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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_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 = 2,
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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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.reserved = 0,
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.imaxstbl = zdev->maxstbl
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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_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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if (!cap)
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return -ENOMEM;
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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_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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if (!cap)
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return -ENOMEM;
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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_core_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, caps);
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if (ret)
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return ret;
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ret = zpci_group_cap(zdev, 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, 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, caps);
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return ret;
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}
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int vfio_pci_zdev_open_device(struct vfio_pci_core_device *vdev)
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{
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struct zpci_dev *zdev = to_zpci(vdev->pdev);
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if (!zdev)
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return -ENODEV;
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if (!vdev->vdev.kvm)
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return 0;
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return kvm_s390_pci_register_kvm(zdev, vdev->vdev.kvm);
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}
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void vfio_pci_zdev_close_device(struct vfio_pci_core_device *vdev)
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{
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struct zpci_dev *zdev = to_zpci(vdev->pdev);
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if (!zdev || !vdev->vdev.kvm)
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return;
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kvm_s390_pci_unregister_kvm(zdev);
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}
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