Create a scm group to enable profiling time spent in a scm call.
This will help determine which scm call is spending how much time in
a higher execution level.
To enable "echo 1 > /sys/kernel/debug/tracing/events/scm/enable".
It is disabled by default. If enabled, traces can be found in
Ftrace logs.
Ftrace Output Example:
PROCESS CPU TIME SCM ID, X0, Number of args, args[0-2], X5, return values [0-2]
kworker/u8:4-329 [002] 128.201129: scm_call_start: func id=0x42000904 (args: 0x6, 0x2, 0x200000000, 0x65b8000000019, 0x142e0f000)
kworker/u8:4-329 [002] 128.201383: scm_call_end: ret: 0, 0, 0x4a07e00000001
kworker/u8:4-329 [002] 128.201464: scm_call_start: func id=0x42000904 (args: 0x6, 0x3, 0x1312d0000000000, 0x17900000000, 0x142e0f000)
kworker/u8:4-329 [002] 128.201542: scm_call_end: ret: 0x1bf03dddddd, 0x2f72656b726f776b, 0x343a32
CRs-Fixed: 969770
Change-Id: I4e5aaff796dbc9457c55fa529114dcb57780b7ec
Signed-off-by: Sanrio Alvares <salvares@codeaurora.org>
e663ad89f8