[PATCH v10 0/7] devfreq: Add devfreq-event class to provide raw data for devfreq device

Chanwoo Choi
2015-01-26T04:17:04Z

This patchset add new devfreq_event class to provide raw data to determine
current utilization of device which is used for devfreq governor.

The following description explains the feature of two kind of devfreq class:
- devfreq class (existing)
: devfreq consumer device use raw data from devfreq_event device for
determining proper current system state and change voltage/frequency
dynamically using various governors.
- devfreq_event class (new)
: Provide measured raw data to devfreq device for governor

Changelog:

Changes from v9:
(https://lkml.org/lkml/2015/1/20/68)
- Fix the operation of enable_count in devfreq_event_{enable|disable}_edev().

Changes from v8:
(https://lkml.org/lkml/2015/1/12/299)
- Fix issue of devfreq-event.c driver by Myunjoo's comment
: Merge patch2 (resource-managed function) with patch1
: Fix bug in devfreq_event_{enable|disable}_edev() about enable_count operation
: Simplify error checking code in devfreq_event_get_event()
: Define devfreq_event_get_drvdata() as static inline function type
: Reduce the time of critical section scope in devfreq_event_remove_edev()
: Rename field name of devfreq_event_data structure
(total_event / event -> total_count / load_count)
- Drop following patch[1] because Exynos5260 cannot be tested for exynos-ppmu.c driver
[1] [PATCHv8 7/9] ARM: dts: Add PPMU dt node for Exynos5260 SoC
- https://lkml.org/lkml/2015/1/12/301
- Clean-up exynos-ppmu.c without update

Changes from v7:
(https://lkml.org/lkml/2015/1/7/795)
- Use EXPORT_SYMBOL_GPL macro instead of EXPORT_SYMBOL
- Fix the binding document of exynos-ppmu.c driver
- Drop the devfreq-event type patch because it isnt' clear
- Fix bug of devfreq_event_add_edev() when fail to execute device_register()
- Modify resource free operation on following functions:
: devfreq_event_remove_edev()
: devfreq_event_release_edev()

Changes from v6:
(https://lkml.org/lkml/2014/12/28/139)
- This patchset is based on v3.19-rc3.
1. devfreq-event class driver
- Fix build break if devfreq-event framework is off
- Add resource-managed function for devfreq-event device
: devm_devfreq_event_add_edev()
: devm_devfreq_event_remove_edev()

Changes from v5:
(https://lkml.org/lkml/2014/12/22/527)
- Rebase these patch-set on v3.19-rc1 and Test it.
1. exynos-ppmu.c
- Change the error value when of_iomap() fail to map the memory
- Remove owner setting of platform_driver
- Add exynos_ppmu_disable() function
2. exynos dts file
- Add PPMU node to Exynos3250-based Monk board
- Remove ppmu_cpu node on Exynos4412-based TRATS2 board and add ppmu_leftbus/rightbus node

Changes from v4:
(https://lkml.org/lkml/2014/12/16/511)
1. devfreq-event class driver
- Add devfreq_event_get_edev_count() function
- Modify the simple description of devfreq-event framework in devfreq-event.c
- Minimize the usage range of global lock usage in devfreq_event_add_edev()
- Remove '_is_enabled()' function pointer in devfreq_event_ops structure
- Add separte CONFIG_PM_DEVFREQ_EVENT configuration
- Add new devfreq-event.h header file including devfreq-event helper functions
2. exynos dts file
- Add new patch to support PPMU with DEVFREQ-event on Exynos4412-based TRATS2

Changes from v3:
(https://lkml.org/lkml/2014/12/12/219)
1. devfreq-event class driver
- Fix return value of devfreq_event_get_event()
- Add new structure devfreq_event_data for devfreq_event_get_event()
- Modify the prototype of devfreq_event_get_event() function
- Call of_node_put after calling of_parse_phandle() to decrement refcount
2. exynos-ppmu driver
- Modify usage of devfreq_event_get_event() function
according to new prototype of this funciton
- Add the additional description to exynos-ppmu.txt how to add PPMU node
in board dts file
- Use 'PPMU_EVENT' macro to remove duplicate codes
- Add the support of PPMU for Exynos5260
3. exynos dts file
- Add missing PPMU_FSYS node to exynos3250.dtsi
- Fix 'ppmu_mfc_l' node name as 'ppmu_mfc' because exynos3250 has only one MFC IP.
- Add missing PPMU_ACP/G3D to exynos4.dtsi
4. etc
- Fix wrong abbreviation of PPMU (PPMU :Platform Performance Monitoring Unit)
- Add new patch to support the PPMU of Exynos5260 SoC

Changes from v2:
(https://lkml.org/lkml/2014/12/9/304)
1. devfreq-event class driver
- Rename all the helper functions of devfreq-event device
- Add devfreq_event_remove_edev() instead of devfreq_put_event_dev()
- Add devfreq_event_release_edev() to initialize it before put device
- Add the detailed description of devfreq-event API
- Add the attributes of devfreq-event class (enable_count)
- Check the overflow about event/total_event data in devfreq_event_get_event()
- Remove the 'exclusive flag' feature
- Set set_event()/get_event() functions as mandary
- Add missing of_node_put() call
- Change variable type of 'get_event()' funciton from 'int' to 'u64'
2. exynos-ppmu driver
- Remove un-used field (struct devfreq)
- Use 'of_get_child_by_name()' instead of 'of_find_node_by_name()'
- Add missing of_node_put() call
- Fix wrong clock control
- Use devfreq_event_remove_edev() instead of devfreq_remove_device()
- Add the documentation for exynos-ppmu driver
- Remove 'enable/disable/is_enabled/reset' function of exynos-ppmu driver
3. exynos3250-rinato.dts
- Add ppmu_{leftbus|rightbus} dt node and remove ppmu_cpu dt node

Changes from v1:
(https://lkml.org/lkml/2014/9/5/11)
- Code clean
- Add the description of devfreq-event structure
- Add 'is_enabled' function to devfreq_event_ops structure
- Add 'enable_count' field to devfreq_event_dev structure
- Check whether devfreq-event device is enabled or not
during calling devfreq_event API
- Define the type of devfreq-event device as following
: DEVFREQ_EVENT_TYPE_RAW_DATA
: DEVFREQ_EVENT_TYPE_UTILIZATION
: DEVFREQ_EVENT_TYPE_BANDWIDTH
: DEVFREQ_EVENT_TYPE_LATENCY
- Add the exclusive feature of devfreq-event device.
If devfreq-event device is used on only on devfreq driver,
should used 'devfreq_enable_event_dev_exclusive()' function
- Add new patch6 for test on Exynos3250-based Rinato board

Chanwoo Choi (7):
devfreq: event: Add new devfreq_event class to provide basic data for devfreq governor
devfreq: event: Add exynos-ppmu devfreq-event driver
devfreq: event: Add documentation for exynos-ppmu devfreq-event driver
ARM: dts: Add PPMU dt node for Exynos3250 SoC
ARM: dts: Add PPMU dt node for Exynos4 SoCs
ARM: dts: exynos: Add PPMU node for Exynos3250-based Rinato/Monk board
ARM: dts: exynos: Add PPMU node for Exynos4412-based TRATS2 board

.../bindings/devfreq/event/exynos-ppmu.txt | 110 +++++
arch/arm/boot/dts/exynos3250-monk.dts | 40 ++
arch/arm/boot/dts/exynos3250-rinato.dts | 40 ++
arch/arm/boot/dts/exynos3250.dtsi | 74 +++
arch/arm/boot/dts/exynos4.dtsi | 108 +++++
arch/arm/boot/dts/exynos4210.dtsi | 8 +
arch/arm/boot/dts/exynos4412-trats2.dts | 40 ++
drivers/devfreq/Kconfig | 2 +
drivers/devfreq/Makefile | 6 +-
drivers/devfreq/devfreq-event.c | 494 +++++++++++++++++++++
drivers/devfreq/event/Kconfig | 25 ++
drivers/devfreq/event/Makefile | 2 +
drivers/devfreq/event/exynos-ppmu.c | 374 ++++++++++++++++
drivers/devfreq/event/exynos-ppmu.h | 93 ++++
include/linux/devfreq-event.h | 196 ++++++++
15 files changed, 1611 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
create mode 100644 drivers/devfreq/devfreq-event.c
create mode 100644 drivers/devfreq/event/Kconfig
create mode 100644 drivers/devfreq/event/Makefile
create mode 100644 drivers/devfreq/event/exynos-ppmu.c
create mode 100644 drivers/devfreq/event/exynos-ppmu.h
create mode 100644 include/linux/devfreq-event.h

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1.8.5.5