• Omer Shpigelman's avatar
    habanalabs: add new IOCTL for debug, tracing and profiling · 315bc055
    Omer Shpigelman authored
    Habanalabs ASICs use the ARM coresight infrastructure to support debug,
    tracing and profiling of neural networks topologies.
    
    Because the coresight is configured using register writes and reads, and
    some of the registers hold sensitive information (e.g. the address in
    the device's DRAM where the trace data is written to), the user must go
    through the kernel driver to configure this mechanism.
    
    This patch implements the common code of the IOCTL and calls the
    ASIC-specific function for the actual H/W configuration.
    
    The IOCTL supports configuration of seven coresight components:
    ETR, ETF, STM, FUNNEL, BMON, SPMU and TIMESTAMP
    
    The user specifies which component he wishes to configure and provides a
    pointer to a structure (located in its process space) that contains the
    relevant configuration.
    
    The common code copies the relevant data from the user-space to kernel
    space and then calls the ASIC-specific function to do the H/W
    configuration.
    
    After the configuration is done, which is usually composed
    of several IOCTL calls depending on what the user wanted to trace, the
    user can start executing the topology. The trace data will be written to
    the user's area in the device's DRAM.
    
    After the tracing operation is complete, and user will call the IOCTL
    again to disable the tracing operation. The user also need to read
    values from registers for some of the components (e.g. the size of the
    trace data in the device's DRAM). In that case, the user will provide a
    pointer to an "output" structure in user-space, which the IOCTL code will
    fill according the to selected component.
    Signed-off-by: default avatarOmer Shpigelman <oshpigelman@habana.ai>
    Signed-off-by: default avatarOded Gabbay <oded.gabbay@gmail.com>
    315bc055
habanalabs_ioctl.c 8.94 KB