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Subject[PATCH 0/2] PM / devfreq: Add debugfs support
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Add debugfs interface to provide debugging information of devfreq device.
It contains 'devfreq_summary' and 'debug_transitions' debugfs file
in order to provide the simple profiling to user via debugfs
without any specific profiling tool.

[Added debugfs file]
- "/sys/kernel/debug/devfreq/devfreq_summary"
: Show the summary of the registered devfreq devices.
- "/sys/kernel/debug/devfreq/devfreq_transitions"
: Show the frequency transition of the registered devfreq devices.

Recommend the each patch to check the detailed description
of each fields of both devfreq_summary and devfreq_transitions.

This series contains the patch[1] and add the patch2 for 'devfreq_transitions'
[1] https://patchwork.kernel.org/patch/11320265/
- [v3] PM / devfreq: Add debugfs support with devfreq_summary file


For example on Exynos5422-based Odroid-XU3 board,
- In order to show the multiple governors on devfreq_summay result,
change the governor of devfreq0 from simple_ondemand to userspace.

$ cat /sys/kernel/debug/devfreq/devfreq_summary
dev_name dev parent_dev governor polling_ms cur_freq_hz min_freq_hz max_freq_hz
------------------------------ ---------- ---------- --------------- ---------- ------------ ------------ ------------
10c20000.memory-controller devfreq0 userspace 0 206000000 165000000 825000000
soc:bus_wcore devfreq1 simple_ondemand 50 532000000 88700000 532000000
soc:bus_noc devfreq2 devfreq1 passive 0 111000000 66600000 111000000
soc:bus_fsys_apb devfreq3 devfreq1 passive 0 222000000 111000000 222000000
soc:bus_fsys devfreq4 devfreq1 passive 0 200000000 75000000 200000000
soc:bus_fsys2 devfreq5 devfreq1 passive 0 200000000 75000000 200000000
soc:bus_mfc devfreq6 devfreq1 passive 0 333000000 83250000 333000000
soc:bus_gen devfreq7 devfreq1 passive 0 266000000 88700000 266000000
soc:bus_peri devfreq8 devfreq1 passive 0 66600000 66600000 66600000
soc:bus_g2d devfreq9 devfreq1 passive 0 0 83250000 333000000
soc:bus_g2d_acp devfreq10 devfreq1 passive 0 0 66500000 266000000
soc:bus_jpeg devfreq11 devfreq1 passive 0 0 75000000 300000000
soc:bus_jpeg_apb devfreq12 devfreq1 passive 0 0 83250000 166500000
soc:bus_disp1_fimd devfreq13 devfreq1 passive 0 0 120000000 200000000
soc:bus_disp1 devfreq14 devfreq1 passive 0 0 120000000 300000000
soc:bus_gscl_scaler devfreq15 devfreq1 passive 0 0 150000000 300000000
soc:bus_mscl devfreq16 devfreq1 passive 0 0 84000000 666000000

$ cat /sys/kernel/debug/devfreq/devfreq_transitions
time_ms dev_name dev parent_dev load_% old_freq_hz new_freq_hz
---------- ------------------------------ ---------- ---------- ---------- ------------ ------------
14600 soc:bus_noc devfreq2 devfreq1 0 100000000 67000000
14600 soc:bus_fsys_apb devfreq3 devfreq1 0 200000000 100000000
14600 soc:bus_fsys devfreq4 devfreq1 0 200000000 100000000
14600 soc:bus_fsys2 devfreq5 devfreq1 0 150000000 75000000
14602 soc:bus_mfc devfreq6 devfreq1 0 222000000 96000000
14602 soc:bus_gen devfreq7 devfreq1 0 267000000 89000000
14602 soc:bus_g2d devfreq9 devfreq1 0 300000000 84000000
14602 soc:bus_g2d_acp devfreq10 devfreq1 0 267000000 67000000
14602 soc:bus_jpeg devfreq11 devfreq1 0 300000000 75000000
14602 soc:bus_jpeg_apb devfreq12 devfreq1 0 167000000 84000000
14603 soc:bus_disp1_fimd devfreq13 devfreq1 0 200000000 120000000
14603 soc:bus_disp1 devfreq14 devfreq1 0 300000000 120000000
14606 soc:bus_gscl_scaler devfreq15 devfreq1 0 300000000 150000000
14606 soc:bus_mscl devfreq16 devfreq1 0 333000000 84000000
14608 soc:bus_wcore devfreq1 9 333000000 84000000
14783 10c20000.memory-controller devfreq0 35 825000000 633000000
15873 soc:bus_wcore devfreq1 41 84000000 400000000
15873 soc:bus_noc devfreq2 devfreq1 0 67000000 100000000
[snip]


Depends on:
It depends on patch[2] for preventing the merge conflic.
[2] https://patchwork.kernel.org/patch/11320257/
- PM / devfreq: Add missing function description and rename static functions

Chanwoo Choi (2):
PM / devfreq: Add debugfs support with devfreq_summary file
PM / devfreq: Add devfreq_transitions debugfs file

drivers/devfreq/Kconfig | 13 ++
drivers/devfreq/devfreq.c | 206 +++++++++++++++++++++++++++++
drivers/devfreq/governor.h | 3 +
drivers/devfreq/governor_passive.c | 2 +
include/linux/devfreq.h | 1 +
5 files changed, 225 insertions(+)

--
2.17.1

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