kernel/include/trace/events/ufs.h, branch linux-4.15.y

scsi: ufs: add trace event for ufs commands

2017-01-05T23:10:04Z

Use the ftrace infrastructure to conditionally trace ufs command events. New trace event is created, which samples the following ufs command data: - device name - optional identification string - task tag - doorbell register - number of transfer bytes - interrupt status register - request start LBA - command opcode Currently we only fully trace read(10) and write(10) commands. All other commands which pass through ufshcd_send_command() will be printed with "-1" in the lba and transfer_len fields. Usage: echo 1 > /sys/kernel/debug/tracing/events/ufs/enable cat /sys/kernel/debug/tracing/trace_pipe Signed-off-by: Lee Susman Signed-off-by: Subhash Jadavani Signed-off-by: Martin K. Petersen

scsi: ufs: add time profiling support

2017-01-05T23:10:04Z

This patch adds the profiling support for some of the time critical operations like hibern8 enter/exit, clock gating & clock scaling. Reviewed-by: Venkat Gopalakrishnan Signed-off-by: Subhash Jadavani Signed-off-by: Martin K. Petersen

scsi: ufs: add tracing support

2017-01-05T23:10:03Z

This change adds the ftrace support for following: 1. UFS initialization time 2. Clock gating states 3. Clock scaling states 4. Power management APIs latency 5. BKOPs enable/disable Usage: echo 1 > /sys/kernel/debug/tracing/events/ufs/enable cat /sys/kernel/debug/tracing/trace_pipe Reviewed-by: Sahitya Tummala Signed-off-by: Subhash Jadavani Signed-off-by: Martin K. Petersen