diff options
| author | Alex Mastro <amastro@fb.com> | 2025-08-04 22:44:31 +0300 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2025-08-25 18:54:00 +0300 |
| commit | 1e736f1489563470b58ede3fae5274a624280cf1 (patch) | |
| tree | 0b96f9e629508ab99db8827408bcbc81a60de0fa /drivers/vfio | |
| parent | 1b237f190eb3d36f52dffe07a40b5eb210280e00 (diff) | |
| download | linux-1e736f1489563470b58ede3fae5274a624280cf1.tar.xz | |
vfio/pci: print vfio-device syspath to fdinfo
Print the PCI device syspath to a vfio device's fdinfo. This enables tools
to query which device is associated with a given vfio device fd.
This results in output like below:
$ cat /proc/"$SOME_PID"/fdinfo/"$VFIO_FD" | grep vfio
vfio-device-syspath: /sys/devices/pci0000:e0/0000:e0:01.1/0000:e1:00.0/0000:e2:05.0/0000:e8:00.0
Signed-off-by: Alex Mastro <amastro@fb.com>
Reviewed-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Tested-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Link: https://lore.kernel.org/r/20250804-show-fdinfo-v4-1-96b14c5691b3@fb.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
| -rw-r--r-- | drivers/vfio/vfio_main.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index 5046cae05222..91a8eae308ea 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -28,6 +28,7 @@ #include <linux/pseudo_fs.h> #include <linux/rwsem.h> #include <linux/sched.h> +#include <linux/seq_file.h> #include <linux/slab.h> #include <linux/stat.h> #include <linux/string.h> @@ -1355,6 +1356,22 @@ static int vfio_device_fops_mmap(struct file *filep, struct vm_area_struct *vma) return device->ops->mmap(device, vma); } +#ifdef CONFIG_PROC_FS +static void vfio_device_show_fdinfo(struct seq_file *m, struct file *filep) +{ + char *path; + struct vfio_device_file *df = filep->private_data; + struct vfio_device *device = df->device; + + path = kobject_get_path(&device->dev->kobj, GFP_KERNEL); + if (!path) + return; + + seq_printf(m, "vfio-device-syspath: /sys%s\n", path); + kfree(path); +} +#endif + const struct file_operations vfio_device_fops = { .owner = THIS_MODULE, .open = vfio_device_fops_cdev_open, @@ -1364,6 +1381,9 @@ const struct file_operations vfio_device_fops = { .unlocked_ioctl = vfio_device_fops_unl_ioctl, .compat_ioctl = compat_ptr_ioctl, .mmap = vfio_device_fops_mmap, +#ifdef CONFIG_PROC_FS + .show_fdinfo = vfio_device_show_fdinfo, +#endif }; static struct vfio_device *vfio_device_from_file(struct file *file) |