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// SPDX-License-Identifier: GPL-2.0-only
/*
* VFIO ZPCI devices support
*
* Copyright (C) IBM Corp. 2020. All rights reserved.
* Author(s): Pierre Morel <pmorel@linux.ibm.com>
* Matthew Rosato <mjrosato@linux.ibm.com>
*/
#include <linux/io.h>
#include <linux/pci.h>
#include <linux/uaccess.h>
#include <linux/vfio.h>
#include <linux/vfio_zdev.h>
#include <linux/kvm_host.h>
#include <asm/pci_clp.h>
#include <asm/pci_io.h>
#include "vfio_pci_priv.h"
/*
* Add the Base PCI Function information to the device info region.
*/
static int zpci_base_cap(struct zpci_dev *zdev, struct vfio_info_cap *caps)
{
struct vfio_device_info_cap_zpci_base cap = {
.header.id = VFIO_DEVICE_INFO_CAP_ZPCI_BASE,
.header.version = 3,
.start_dma = zdev->start_dma,
.end_dma = zdev->end_dma,
.pchid = zdev->pchid,
.vfn = zdev->vfn,
.fmb_length = zdev->fmb_length,
.pft = zdev->pft,
.gid = zdev->pfgid,
.fh = zdev->fh,
.ccdf_err_length = sizeof(struct zpci_ccdf_err)
};
return vfio_info_add_capability(caps, &cap.header, sizeof(cap));
}
/*
* Add the Base PCI Function Group information to the device info region.
*/
static int zpci_group_cap(struct zpci_dev *zdev, struct vfio_info_cap *caps)
{
struct vfio_device_info_cap_zpci_group cap = {
.header.id = VFIO_DEVICE_INFO_CAP_ZPCI_GROUP,
.header.version = 2,
.dasm = zdev->dma_mask,
.msi_addr = zdev->msi_addr,
.flags = VFIO_DEVICE_INFO_ZPCI_FLAG_REFRESH,
.mui = zdev->fmb_update,
.noi = zdev->max_msi,
.maxstbl = ZPCI_MAX_WRITE_SIZE,
.version = zdev->version,
.reserved = 0,
.imaxstbl = zdev->maxstbl
};
return vfio_info_add_capability(caps, &cap.header, sizeof(cap));
}
/*
* Add the device utility string to the device info region.
*/
static int zpci_util_cap(struct zpci_dev *zdev, struct vfio_info_cap *caps)
{
struct vfio_device_info_cap_zpci_util *cap;
int cap_size = sizeof(*cap) + CLP_UTIL_STR_LEN;
int ret;
cap = kmalloc(cap_size, GFP_KERNEL);
if (!cap)
return -ENOMEM;
cap->header.id = VFIO_DEVICE_INFO_CAP_ZPCI_UTIL;
cap->header.version = 1;
cap->size = CLP_UTIL_STR_LEN;
memcpy(cap->util_str, zdev->util_str, cap->size);
ret = vfio_info_add_capability(caps, &cap->header, cap_size);
kfree(cap);
return ret;
}
/*
* Add the function path string to the device info region.
*/
static int zpci_pfip_cap(struct zpci_dev *zdev, struct vfio_info_cap *caps)
{
struct vfio_device_info_cap_zpci_pfip *cap;
int cap_size = sizeof(*cap) + CLP_PFIP_NR_SEGMENTS;
int ret;
cap = kmalloc(cap_size, GFP_KERNEL);
if (!cap)
return -ENOMEM;
cap->header.id = VFIO_DEVICE_INFO_CAP_ZPCI_PFIP;
cap->header.version = 1;
cap->size = CLP_PFIP_NR_SEGMENTS;
memcpy(cap->pfip, zdev->pfip, cap->size);
ret = vfio_info_add_capability(caps, &cap->header, cap_size);
kfree(cap);
return ret;
}
/*
* Add all supported capabilities to the VFIO_DEVICE_GET_INFO capability chain.
*/
int vfio_pci_info_zdev_add_caps(struct vfio_pci_core_device *vdev,
struct vfio_info_cap *caps)
{
struct zpci_dev *zdev = to_zpci(vdev->pdev);
int ret;
if (!zdev)
return -ENODEV;
ret = zpci_base_cap(zdev, caps);
if (ret)
return ret;
ret = zpci_group_cap(zdev, caps);
if (ret)
return ret;
if (zdev->util_str_avail) {
ret = zpci_util_cap(zdev, caps);
if (ret)
return ret;
}
ret = zpci_pfip_cap(zdev, caps);
return ret;
}
int vfio_pci_zdev_feature_err(struct vfio_device *device, u32 flags,
void __user *arg, size_t argsz)
{
struct vfio_device_feature_zpci_err err;
struct vfio_pci_core_device *vdev;
struct zpci_ccdf_err ccdf = {};
struct zpci_dev *zdev;
int ret;
vdev = container_of(device, struct vfio_pci_core_device, vdev);
zdev = to_zpci(vdev->pdev);
if (!zdev)
return -ENODEV;
ret = vfio_check_feature(flags, argsz, VFIO_DEVICE_FEATURE_GET,
sizeof(err));
if (ret != 1)
return ret;
if (copy_from_user(&err, arg, sizeof(err)))
return -EFAULT;
if (!err.data)
return -EINVAL;
ret = zpci_get_pending_error(zdev, &ccdf);
if (ret)
return ret;
if (copy_to_user(u64_to_user_ptr(err.data), &ccdf, sizeof(ccdf))) {
dev_warn_ratelimited(device->dev,
"Failed to handle PCI error event for PCI function 0x%x",
zdev->fid);
return -EFAULT;
}
return 0;
}
int vfio_pci_zdev_open_device(struct vfio_pci_core_device *vdev)
{
struct zpci_dev *zdev = to_zpci(vdev->pdev);
int ret;
if (!zdev)
return -ENODEV;
zpci_start_mediated_recovery(zdev);
if (!vdev->vdev.kvm)
return 0;
ret = -ENOENT;
if (zpci_kvm_hook.kvm_register)
ret = zpci_kvm_hook.kvm_register(zdev, vdev->vdev.kvm);
if (ret)
zpci_stop_mediated_recovery(zdev);
return ret;
}
void vfio_pci_zdev_close_device(struct vfio_pci_core_device *vdev)
{
struct zpci_dev *zdev = to_zpci(vdev->pdev);
if (!zdev)
return;
zpci_stop_mediated_recovery(zdev);
if (!vdev->vdev.kvm)
return;
if (zpci_kvm_hook.kvm_unregister)
zpci_kvm_hook.kvm_unregister(zdev);
}
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