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d3569c149d
Pull devfreq updates for 5.11 from Chanwoo Choi:
1. Update devfreq core
- Add new devfreq_frequency tracepoint to show the frequency change
information.
- Add governor feature flag. The devfreq governor is able to set the
specific flag in order to support a non-common feature. For
example, if the governor supports the 'immutable' feature, don't
allow user space to change the governor via sysfs.
- Add governor sysfs attribute flag for each sysfs file. Prior to that
the devfreq subsystem allowed all of the sysfs files to be accessed
regardless of the governor type. But some sysfs fils are not
supported by specific devfreq governors. In order to only allow the
sysfs files supported by the governor to be accessed, clarify the
access permissions of sysfs attributes according to the governor.
When adding the devfreq governor, specify the available attribute
information by using DEVFREQ_GOV_ATTR_* symbols. The user can read
or write the sysfs attributes in accordance to the specified
access permissions.
- Clean-up the code to reduce duplication for the devfreq tracepoint
and to remove redundant governor_name field from struct devfreq.
2. Update exynos-bus.c devfreq driver
- Add interconnect API support to the Samsung Exynos Bus Frequency
driver, exynos-bus.c. Complementing the devfreq driver with
interconnect functionality allows to ensure that the QoS
requirements regarding devices accessing the system memory (e.g.
video processing devices) will be met and allows to avoid issues
like DMA underrun.
3. Update tegra devfreq driver
- Add interconnect support and OPP interface to tegra30-devfreq.c.
Also, it is to guarantee the QoS requirement of some devices like
the display controller.
- Move tegra20-devfreq.c from drivers/devfreq/ into drivers/memory/tegra/
in order to use the more proper monitoring feature such as EMC_STAT
which is located in drivers/memory/tegra/.
- Separate the configuration information for different SoCs in
tegra30-devfrqe.c. The tegra30-devfreq.c had been supporting both
tegra30-actmon and tegra124-actmon devices. In order to use the
more correct configuration data, separate them.
- Use dev_err_probe() to handle the deferred probe error in
tegra30-devfreq.c.
4. Pull the request of 'Tegra SoC and clock controller changes for
v5.11' sent by Krzysztof Kozlowski <krzk@kernel.org> in order to
avoid a build error."
* tag 'devfreq-next-for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux:
PM / devfreq: tegra30: Separate configurations per-SoC generation
PM / devfreq: tegra30: Support interconnect and OPPs from device-tree
PM / devfreq: tegra20: Deprecate in a favor of emc-stat based driver
PM / devfreq: exynos-bus: Add registration of interconnect child device
dt-bindings: devfreq: Add documentation for the interconnect properties
soc/tegra: fuse: Add stub for tegra_sku_info
soc/tegra: fuse: Export tegra_read_ram_code()
clk: tegra: Export Tegra20 EMC kernel symbols
PM / devfreq: tegra30: Silence deferred probe error
PM / devfreq: tegra20: Relax Kconfig dependency
PM / devfreq: tegra20: Silence deferred probe error
PM / devfreq: Remove redundant governor_name from struct devfreq
PM / devfreq: Add governor attribute flag for specifc sysfs nodes
PM / devfreq: Add governor feature flag
PM / devfreq: Add tracepoint for frequency changes
PM / devfreq: Unify frequency change to devfreq_update_target func
trace: events: devfreq: Use fixed indentation size to improve readability
135 lines
4.7 KiB
Plaintext
135 lines
4.7 KiB
Plaintext
What: /sys/class/devfreq/.../
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Date: September 2011
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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Provide a place in sysfs for the devfreq objects.
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This allows accessing various devfreq specific variables.
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The name of devfreq object denoted as ... is same as the
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name of device using devfreq.
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What: /sys/class/devfreq/.../name
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Date: November 2019
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Contact: Chanwoo Choi <cw00.choi@samsung.com>
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Description:
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The /sys/class/devfreq/.../name shows the name of device
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of the corresponding devfreq object.
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What: /sys/class/devfreq/.../governor
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Date: September 2011
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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The /sys/class/devfreq/.../governor show or set the name of the
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governor used by the corresponding devfreq object.
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What: /sys/class/devfreq/.../cur_freq
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Date: September 2011
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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The /sys/class/devfreq/.../cur_freq shows the current
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frequency of the corresponding devfreq object. Same as
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target_freq when get_cur_freq() is not implemented by
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devfreq driver.
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What: /sys/class/devfreq/.../target_freq
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Date: September 2012
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Contact: Rajagopal Venkat <rajagopal.venkat@linaro.org>
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Description:
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The /sys/class/devfreq/.../target_freq shows the next governor
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predicted target frequency of the corresponding devfreq object.
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What: /sys/class/devfreq/.../trans_stat
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Date: October 2012
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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This ABI shows or clears the statistics of devfreq behavior
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on a specific device. It shows the time spent in each state
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and the number of transitions between states.
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In order to activate this ABI, the devfreq target device
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driver should provide the list of available frequencies
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with its profile. If need to reset the statistics of devfreq
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behavior on a specific device, enter 0(zero) to 'trans_stat'
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as following::
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echo 0 > /sys/class/devfreq/.../trans_stat
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What: /sys/class/devfreq/.../available_frequencies
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Date: October 2012
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Contact: Nishanth Menon <nm@ti.com>
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Description:
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The /sys/class/devfreq/.../available_frequencies shows
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the available frequencies of the corresponding devfreq object.
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This is a snapshot of available frequencies and not limited
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by the min/max frequency restrictions.
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What: /sys/class/devfreq/.../available_governors
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Date: October 2012
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Contact: Nishanth Menon <nm@ti.com>
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Description:
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The /sys/class/devfreq/.../available_governors shows
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currently available governors in the system.
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What: /sys/class/devfreq/.../min_freq
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Date: January 2013
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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The /sys/class/devfreq/.../min_freq shows and stores
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the minimum frequency requested by users. It is 0 if
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the user does not care. min_freq overrides the
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frequency requested by governors.
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What: /sys/class/devfreq/.../max_freq
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Date: January 2013
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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The /sys/class/devfreq/.../max_freq shows and stores
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the maximum frequency requested by users. It is 0 if
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the user does not care. max_freq overrides the
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frequency requested by governors and min_freq.
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The max_freq overrides min_freq because max_freq may be
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used to throttle devices to avoid overheating.
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What: /sys/class/devfreq/.../polling_interval
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Date: September 2011
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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The /sys/class/devfreq/.../polling_interval shows and sets
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the requested polling interval of the corresponding devfreq
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object. The values are represented in ms. If the value is
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less than 1 jiffy, it is considered to be 0, which means
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no polling. This value is meaningless if the governor is
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not polling; thus. If the governor is not using
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devfreq-provided central polling
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(/sys/class/devfreq/.../central_polling is 0), this value
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may be useless.
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A list of governors that support the node:
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- simple_ondmenad
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- tegra_actmon
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What: /sys/class/devfreq/.../userspace/set_freq
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Date: September 2011
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Contact: MyungJoo Ham <myungjoo.ham@samsung.com>
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Description:
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The /sys/class/devfreq/.../userspace/set_freq shows and
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sets the requested frequency for the devfreq object if
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userspace governor is in effect.
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A list of governors that support the node:
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- userspace
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What: /sys/class/devfreq/.../timer
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Date: July 2020
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Contact: Chanwoo Choi <cw00.choi@samsung.com>
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Description:
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This ABI shows and stores the kind of work timer by users.
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This work timer is used by devfreq workqueue in order to
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monitor the device status such as utilization. The user
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can change the work timer on runtime according to their demand
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as following::
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echo deferrable > /sys/class/devfreq/.../timer
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echo delayed > /sys/class/devfreq/.../timer
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A list of governors that support the node:
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- simple_ondemand
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