Add a debugfs function to the hisilicon migration driver in VFIO to provide intermediate state values and data during device migration. 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 v14 -> v15 Correct variable declaration type Changes v13 -> v14 Bugfix the parameter problem of seq_puts() Changes v12 -> v13 Replace seq_printf() with seq_puts() Changes v11 -> v12 Update comments and delete unnecessary logs Changes v10 -> v11 Update conditions for debugfs registration Changes v9 -> v10 Optimize symmetry processing of mutex Changes v8 -> v9 Added device enable mutex Changes v7 -> v8 Delete unnecessary information Changes v6 -> v7 Remove redundant kernel error log printing and remove unrelated bugfix code Changes v5 -> v6 Modify log output calling error Changes v4 -> v5 Adjust the descriptioniptionbugfs file directory Changes v3 -> v4 Rebased on kernel6.9 Changes 2 -> v3 Solve debugfs serialization problem. Changes v1 -> v2 Solve the racy problem of io_base. Longfang Liu (4): hisi_acc_vfio_pci: extract public functions for container_of hisi_acc_vfio_pci: create subfunction for data reading hisi_acc_vfio_pci: register debugfs for hisilicon migration driver Documentation: add debugfs description for hisi migration .../ABI/testing/debugfs-hisi-migration | 25 ++ .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 266 ++++++++++++++++-- .../vfio/pci/hisilicon/hisi_acc_vfio_pci.h | 19 ++ 3 files changed, 279 insertions(+), 31 deletions(-) create mode 100644 Documentation/ABI/testing/debugfs-hisi-migration -- 2.24.0
