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 static int vfio_device_features_read(struct seq_file *seq, void *data) 62 { 63 struct device *vf_dev = seq->private; 64 struct vfio_device *vdev = container_of(vf_dev, struct vfio_device, device); 65 66 if (vdev->migration_flags & VFIO_MIGRATION_STOP_COPY) 67 seq_puts(seq, "stop-copy\n"); 68 if (vdev->migration_flags & VFIO_MIGRATION_P2P) 69 seq_puts(seq, "p2p\n"); 70 if (vdev->migration_flags & VFIO_MIGRATION_PRE_COPY) 71 seq_puts(seq, "pre-copy\n"); 72 if (vdev->log_ops) 73 seq_puts(seq, "dirty-tracking\n"); 74 75 return 0; 76 } 77 78 void vfio_device_debugfs_init(struct vfio_device *vdev) 79 { 80 struct device *dev = &vdev->device; 81 82 vdev->debug_root = debugfs_create_dir(dev_name(vdev->dev), 83 vfio_debugfs_root); 84 85 if (vdev->mig_ops) { 86 struct dentry *vfio_dev_migration = NULL; 87 88 vfio_dev_migration = debugfs_create_dir("migration", 89 vdev->debug_root); 90 debugfs_create_devm_seqfile(dev, "state", vfio_dev_migration, 91 vfio_device_state_read); 92 debugfs_create_devm_seqfile(dev, "features", vfio_dev_migration, 93 vfio_device_features_read); 94 } 95 } 96 97 void vfio_device_debugfs_exit(struct vfio_device *vdev) 98 { 99 debugfs_remove_recursive(vdev->debug_root); 100 } 101 102 void vfio_debugfs_create_root(void) 103 { 104 vfio_debugfs_root = debugfs_create_dir("vfio", NULL); 105 } 106 107 void vfio_debugfs_remove_root(void) 108 { 109 debugfs_remove_recursive(vfio_debugfs_root); 110 vfio_debugfs_root = NULL; 111 } 112