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linux/drivers/vfio/debugfs.c

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vfio/migration: Add debugfs to live migration driver There are multiple devices, software and operational steps involved in the process of live migration. An error occurred on any node may cause the live migration operation to fail. This complex process makes it very difficult to locate and analyze the cause when the function fails. In order to quickly locate the cause of the problem when the live migration fails, I added a set of debugfs to the vfio live migration driver. +-------------------------------------------+ | | | | | QEMU | | | | | +---+----------------------------+----------+ | ^ | ^ | | | | | | | | v | v | +---------+--+ +---------+--+ |src vfio_dev| |dst vfio_dev| +--+---------+ +--+---------+ | ^ | ^ | | | | v | | | +-----------+----+ +-----------+----+ |src dev debugfs | |dst dev debugfs | +----------------+ +----------------+ The entire debugfs directory will be based on the definition of the CONFIG_DEBUG_FS macro. If this macro is not enabled, the interfaces in vfio.h will be empty definitions, and the creation and initialization of the debugfs directory will not be executed. vfio | +---<dev_name1> | +---migration | +--state | +---<dev_name2> +---migration +--state debugfs will create a public root directory "vfio" file. then create a dev_name() file for each live migration device. First, create a unified state acquisition file of "migration" in this device directory. Then, create a public live migration state lookup file "state". Signed-off-by: Longfang Liu <liulongfang@huawei.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/r/20231106072225.28577-2-liulongfang@huawei.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2023-11-06 00:22:23 -07:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2023, HiSilicon Ltd.
*/
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/vfio.h>
#include "vfio.h"
static struct dentry *vfio_debugfs_root;
static int vfio_device_state_read(struct seq_file *seq, void *data)
{
struct device *vf_dev = seq->private;
struct vfio_device *vdev = container_of(vf_dev,
struct vfio_device, device);
enum vfio_device_mig_state state;
int ret;
BUILD_BUG_ON(VFIO_DEVICE_STATE_NR !=
VFIO_DEVICE_STATE_PRE_COPY_P2P + 1);
ret = vdev->mig_ops->migration_get_state(vdev, &state);
if (ret)
return -EINVAL;
switch (state) {
case VFIO_DEVICE_STATE_ERROR:
seq_puts(seq, "ERROR\n");
break;
case VFIO_DEVICE_STATE_STOP:
seq_puts(seq, "STOP\n");
break;
case VFIO_DEVICE_STATE_RUNNING:
seq_puts(seq, "RUNNING\n");
break;
case VFIO_DEVICE_STATE_STOP_COPY:
seq_puts(seq, "STOP_COPY\n");
break;
case VFIO_DEVICE_STATE_RESUMING:
seq_puts(seq, "RESUMING\n");
break;
case VFIO_DEVICE_STATE_RUNNING_P2P:
seq_puts(seq, "RUNNING_P2P\n");
break;
case VFIO_DEVICE_STATE_PRE_COPY:
seq_puts(seq, "PRE_COPY\n");
break;
case VFIO_DEVICE_STATE_PRE_COPY_P2P:
seq_puts(seq, "PRE_COPY_P2P\n");
break;
default:
seq_puts(seq, "Invalid\n");
}
return 0;
}
void vfio_device_debugfs_init(struct vfio_device *vdev)
{
struct device *dev = &vdev->device;
vdev->debug_root = debugfs_create_dir(dev_name(vdev->dev),
vfio_debugfs_root);
if (vdev->mig_ops) {
struct dentry *vfio_dev_migration = NULL;
vfio_dev_migration = debugfs_create_dir("migration",
vdev->debug_root);
debugfs_create_devm_seqfile(dev, "state", vfio_dev_migration,
vfio_device_state_read);
}
}
void vfio_device_debugfs_exit(struct vfio_device *vdev)
{
debugfs_remove_recursive(vdev->debug_root);
}
void vfio_debugfs_create_root(void)
{
vfio_debugfs_root = debugfs_create_dir("vfio", NULL);
}
void vfio_debugfs_remove_root(void)
{
debugfs_remove_recursive(vfio_debugfs_root);
vfio_debugfs_root = NULL;
}