Add a debugfs function to the migration driver in VFIO to provide a step-by-step test function for the migration driver.
When the execution of live migration fails, the user can view the status and data during the migration process separately from the source and the destination, which is convenient for users to analyze and locate problems.
Changes v6 -> v7 Fix some code style issues.
Changes v5 -> v6 Control the creation of debugfs through the CONFIG_DEBUG_FS.
Changes v4 -> v5 Remove the newly added vfio_migration_ops and use seq_printf to optimize the implementation of debugfs.
Changes v3 -> v4 Change the migration_debug_operate interface to debug_root file.
Changes v2 -> v3 Extend the debugfs function from hisilicon device to vfio.
Changes v1 -> v2 Change the registration method of root_debugfs to register with module initialization.
Longfang Liu (5): vfio/migration: Add debugfs to live migration driver hisi_acc_vfio_pci: extract public functions for container_of hisi_acc_vfio_pci: register debugfs for hisilicon migration driver Documentation: add debugfs description for hisi_acc_vfio_pci vfio: update live migration device status
.../ABI/testing/debugfs-hisi-migration | 32 ++ drivers/vfio/pci/Makefile | 1 + .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 306 +++++++++++++++++- .../vfio/pci/hisilicon/hisi_acc_vfio_pci.h | 11 + drivers/vfio/pci/mlx5/main.c | 3 + drivers/vfio/pci/vfio_pci_core.c | 3 + drivers/vfio/pci/vfio_pci_debugfs.c | 80 +++++ drivers/vfio/pci/vfio_pci_debugfs.h | 28 ++ include/linux/vfio.h | 8 + 9 files changed, 462 insertions(+), 10 deletions(-) create mode 100644 Documentation/ABI/testing/debugfs-hisi-migration create mode 100644 drivers/vfio/pci/vfio_pci_debugfs.c create mode 100644 drivers/vfio/pci/vfio_pci_debugfs.h