On 05/18/15 14:51, Ankit Gupta wrote: > 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 > events. > > 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] > > Signed-off-by: Ankit Gupta <ankgupta@xxxxxxxxxxxxxx> > Signed-off-by: Gilad Avidov <gavidov@xxxxxxxxxxxxxx> > Suggested-by: Sagar Dharia <sdharia@xxxxxxxxxxxxxx> > --- Assuming you fix sign-off-chain: Reviewed-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
