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hisi_acc_vfio_pci: Add support for precopy IOCTL

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PRECOPY IOCTL in the case of HiSiIicon ACC driver can be used to
perform the device compatibility check earlier during migration.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Link: https://lore.kernel.org/r/20221123113236.896-2-shameerali.kolothum.thodi@huawei.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Shameer Kolothum 2022-11-23 11:32:33 +00:00 committed by Alex Williamson
parent ccc2a52e46
commit 64ffbbb1e9
2 changed files with 53 additions and 0 deletions
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52
drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
View File

@ -764,9 +764,58 @@ hisi_acc_vf_pci_resume(struct hisi_acc_vf_core_device *hisi_acc_vdev)
stream_open(migf->filp->f_inode, migf->filp);
mutex_init(&migf->lock);
migf->hisi_acc_vdev = hisi_acc_vdev;
return migf;
}
static long hisi_acc_vf_precopy_ioctl(struct file *filp,
unsigned int cmd, unsigned long arg)
{
struct hisi_acc_vf_migration_file *migf = filp->private_data;
struct hisi_acc_vf_core_device *hisi_acc_vdev = migf->hisi_acc_vdev;
loff_t *pos = &filp->f_pos;
struct vfio_precopy_info info;
unsigned long minsz;
int ret;
if (cmd != VFIO_MIG_GET_PRECOPY_INFO)
return -ENOTTY;
minsz = offsetofend(struct vfio_precopy_info, dirty_bytes);
if (copy_from_user(&info, (void __user *)arg, minsz))
return -EFAULT;
if (info.argsz < minsz)
return -EINVAL;
mutex_lock(&hisi_acc_vdev->state_mutex);
if (hisi_acc_vdev->mig_state != VFIO_DEVICE_STATE_PRE_COPY) {
mutex_unlock(&hisi_acc_vdev->state_mutex);
return -EINVAL;
}
mutex_lock(&migf->lock);
if (migf->disabled) {
ret = -ENODEV;
goto out;
}
if (*pos > migf->total_length) {
ret = -EINVAL;
goto out;
}
info.dirty_bytes = 0;
info.initial_bytes = migf->total_length - *pos;
ret = copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;
out:
mutex_unlock(&migf->lock);
mutex_unlock(&hisi_acc_vdev->state_mutex);
return ret;
}
static ssize_t hisi_acc_vf_save_read(struct file *filp, char __user *buf, size_t len,
loff_t *pos)
{
@ -807,6 +856,8 @@ out_unlock:
static const struct file_operations hisi_acc_vf_save_fops = {
.owner = THIS_MODULE,
.read = hisi_acc_vf_save_read,
.unlocked_ioctl = hisi_acc_vf_precopy_ioctl,
.compat_ioctl = compat_ptr_ioctl,
.release = hisi_acc_vf_release_file,
.llseek = no_llseek,
};
@ -832,6 +883,7 @@ hisi_acc_vf_stop_copy(struct hisi_acc_vf_core_device *hisi_acc_vdev)
stream_open(migf->filp->f_inode, migf->filp);
mutex_init(&migf->lock);
migf->hisi_acc_vdev = hisi_acc_vdev;
ret = vf_qm_state_save(hisi_acc_vdev, migf);
if (ret) {

1
drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
View File

@ -91,6 +91,7 @@ struct hisi_acc_vf_migration_file {
struct mutex lock;
bool disabled;
struct hisi_acc_vf_core_device *hisi_acc_vdev;
struct acc_vf_data vf_data;
size_t total_length;
};