1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2023, HiSilicon Ltd. 4 */ 5 6 #include <linux/device.h> 7 #include <linux/debugfs.h> 8 #include <linux/seq_file.h> 9 #include <linux/vfio.h> 10 #include "vfio.h" 11 12 static struct dentry *vfio_debugfs_root; 13 14 static int vfio_device_state_read(struct seq_file *seq, void *data) 15 { 16 struct device *vf_dev = seq->private; 17 struct vfio_device *vdev = container_of(vf_dev, 18 struct vfio_device, device); 19 enum vfio_device_mig_state state; 20 int ret; 21 22 BUILD_BUG_ON(VFIO_DEVICE_STATE_NR != 23 VFIO_DEVICE_STATE_PRE_COPY_P2P + 1); 24 25 ret = vdev->mig_ops->migration_get_state(vdev, &state); 26 if (ret) 27 return -EINVAL; 28 29 switch (state) { 30 case VFIO_DEVICE_STATE_ERROR: 31 seq_puts(seq, "ERROR\n"); 32 break; 33 case VFIO_DEVICE_STATE_STOP: 34 seq_puts(seq, "STOP\n"); 35 break; 36 case VFIO_DEVICE_STATE_RUNNING: 37 seq_puts(seq, "RUNNING\n"); 38 break; 39 case VFIO_DEVICE_STATE_STOP_COPY: 40 seq_puts(seq, "STOP_COPY\n"); 41 break; 42 case VFIO_DEVICE_STATE_RESUMING: 43 seq_puts(seq, "RESUMING\n"); 44 break; 45 case VFIO_DEVICE_STATE_RUNNING_P2P: 46 seq_puts(seq, "RUNNING_P2P\n"); 47 break; 48 case VFIO_DEVICE_STATE_PRE_COPY: 49 seq_puts(seq, "PRE_COPY\n"); 50 break; 51 case VFIO_DEVICE_STATE_PRE_COPY_P2P: 52 seq_puts(seq, "PRE_COPY_P2P\n"); 53 break; 54 default: 55 seq_puts(seq, "Invalid\n"); 56 } 57 58 return 0; 59 } 60 61 void vfio_device_debugfs_init(struct vfio_device *vdev) 62 { 63 struct device *dev = &vdev->device; 64 65 vdev->debug_root = debugfs_create_dir(dev_name(vdev->dev), 66 vfio_debugfs_root); 67 68 if (vdev->mig_ops) { 69 struct dentry *vfio_dev_migration = NULL; 70 71 vfio_dev_migration = debugfs_create_dir("migration", 72 vdev->debug_root); 73 debugfs_create_devm_seqfile(dev, "state", vfio_dev_migration, 74 vfio_device_state_read); 75 } 76 } 77 78 void vfio_device_debugfs_exit(struct vfio_device *vdev) 79 { 80 debugfs_remove_recursive(vdev->debug_root); 81 } 82 83 void vfio_debugfs_create_root(void) 84 { 85 vfio_debugfs_root = debugfs_create_dir("vfio", NULL); 86 } 87 88 void vfio_debugfs_remove_root(void) 89 { 90 debugfs_remove_recursive(vfio_debugfs_root); 91 vfio_debugfs_root = NULL; 92 } 93