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Add reg_state attribute to fetch the register snapshot of different IPs like XGMI, WAFL,PCIE and USR. To get a snapshot for a particular IP 1) Open the sysfs file 2) Seek to the offset as defined in amdgpu_sysfs_reg_offset 3) Read Signed-off-by: Lijo Lazar <lijo.lazar@amd.com> Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>