• Ankit Gupta's avatar
    spmi: add command tracepoints for SPMI · a9fce374
    Ankit Gupta authored
    Add tracepoints to retrieve information about read, write
    and non-data commands. For performance measurement support
    tracepoints are added at the beginning and at the end of
    transfers. Following is a list showing the new tracepoint
    events. The "cmd" parameter here represents the opcode, SID,
    and full 16-bit address.
    spmi_write_begin: cmd and data buffer.
    spmi_write_end  : cmd and return value.
    spmi_read_begin : cmd.
    spmi_read_end   : cmd, return value and data buffer.
    spmi_cmd        : cmd.
    The reason that cmd appears at both the beginning and at
    the end event is that SPMI drivers can request commands
    concurrently. cmd helps in matching the corresponding
    SPMI tracepoints can be enabled like:
    echo 1 >/sys/kernel/debug/tracing/events/spmi/enable
    and will dump messages that can be viewed in
    /sys/kernel/debug/tracing/trace that look like:
    ... spmi_read_begin: opc=56 sid=00 addr=0x0000
    ... spmi_read_end: opc=56 sid=00 addr=0x0000 ret=0 len=02 buf=0x[01-40]
    ... spmi_write_begin: opc=48 sid=00 addr=0x0000 len=3 buf=0x[ff-ff-ff]
    Suggested-by: default avatarSagar Dharia <sdharia@codeaurora.org>
    Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
    Reviewed-by: default avatarStephen Boyd <sboyd@codeaurora.org>
    Signed-off-by: default avatarGilad Avidov <gavidov@codeaurora.org>
    Signed-off-by: default avatarAnkit Gupta <ankgupta@codeaurora.org>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
spmi.h 3.22 KB