224f892972
This driver boosts enumerated devfreq devices upon input, and allows for boosting specific devfreq devices on other custom events. The boost frequencies for this driver should be set so that frame drops are near-zero at the boosted frequencies and power consumption is minimized at said frequencies. The goal of this driver is to provide an interface to achieve optimal device performance by requesting boosts on key events, such as when a frame is ready to rendered to the display. Currently, support is only present for boosting the cpu-llcc-ddr-bw devfreq device, but the driver is structured in a way that makes it easy to add support for new boostable devfreq devices in the future. Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com> Signed-off-by: UtsavBalar1231 <utsavbalar1231@gmail.com>
302 lines
11 KiB
Plaintext
302 lines
11 KiB
Plaintext
menuconfig PM_DEVFREQ
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bool "Generic Dynamic Voltage and Frequency Scaling (DVFS) support"
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select SRCU
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select PM_OPP
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help
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A device may have a list of frequencies and voltages available.
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devfreq, a generic DVFS framework can be registered for a device
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in order to let the governor provided to devfreq choose an
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operating frequency based on the device driver's policy.
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Each device may have its own governor and policy. Devfreq can
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reevaluate the device state periodically and/or based on the
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notification to "nb", a notifier block, of devfreq.
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Like some CPUs with CPUfreq, a device may have multiple clocks.
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However, because the clock frequencies of a single device are
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determined by the single device's state, an instance of devfreq
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is attached to a single device and returns a "representative"
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clock frequency of the device, which is also attached
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to a device by 1-to-1. The device registering devfreq takes the
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responsibility to "interpret" the representative frequency and
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to set its every clock accordingly with the "target" callback
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given to devfreq.
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When OPP is used with the devfreq device, it is recommended to
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register devfreq's nb to the OPP's notifier head. If OPP is
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used with the devfreq device, you may use OPP helper
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functions defined in devfreq.h.
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if PM_DEVFREQ
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comment "DEVFREQ Governors"
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config DEVFREQ_GOV_SIMPLE_ONDEMAND
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tristate "Simple Ondemand"
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help
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Chooses frequency based on the recent load on the device. Works
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similar as ONDEMAND governor of CPUFREQ does. A device with
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Simple-Ondemand should be able to provide busy/total counter
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values that imply the usage rate. A device may provide tuned
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values to the governor with data field at devfreq_add_device().
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config DEVFREQ_GOV_PERFORMANCE
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tristate "Performance"
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help
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Sets the frequency at the maximum available frequency.
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This governor always returns UINT_MAX as frequency so that
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the DEVFREQ framework returns the highest frequency available
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at any time.
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config DEVFREQ_GOV_POWERSAVE
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tristate "Powersave"
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help
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Sets the frequency at the minimum available frequency.
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This governor always returns 0 as frequency so that
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the DEVFREQ framework returns the lowest frequency available
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at any time.
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config DEVFREQ_GOV_USERSPACE
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tristate "Userspace"
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help
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Sets the frequency at the user specified one.
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This governor returns the user configured frequency if there
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has been an input to /sys/devices/.../power/devfreq_set_freq.
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Otherwise, the governor does not change the frequency
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given at the initialization.
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config DEVFREQ_GOV_PASSIVE
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tristate "Passive"
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help
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Sets the frequency based on the frequency of its parent devfreq
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device. This governor does not change the frequency by itself
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through sysfs entries. The passive governor recommends that
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devfreq device uses the OPP table to get the frequency/voltage.
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config DEVFREQ_GOV_CPUFREQ
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tristate "CPUfreq"
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depends on CPU_FREQ
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help
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Chooses frequency based on the online CPUs' current frequency and a
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CPU frequency to device frequency mapping table(s). This governor
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can be useful for controlling devices such as DDR, cache, CCI, etc.
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config QCOM_BIMC_BWMON
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tristate "QCOM BIMC Bandwidth monitor hardware"
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depends on ARCH_QCOM
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help
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The BIMC Bandwidth monitor hardware allows for monitoring the
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traffic coming from each master port connected to the BIMC. It also
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has the capability to raise an IRQ when the count exceeds a
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programmable limit.
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config ARM_MEMLAT_MON
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tristate "ARM CPU Memory Latency monitor hardware"
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depends on ARCH_QCOM
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help
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The PMU present on these ARM cores allow for the use of counters to
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monitor the memory latency characteristics of an ARM CPU workload.
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This driver uses these counters to implement the APIs needed by
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the mem_latency devfreq governor.
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config QCOMCCI_HWMON
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tristate "QTI CCI Cache monitor hardware"
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depends on ARCH_QCOM
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help
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QTI CCI has additional PMU counters that can be used to monitor
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cache requests. QTI CCI hardware monitor device configures these
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registers to monitor cache and inform governor. It can also set an
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IRQ when count exceeds a programmable limit.
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config QCOM_M4M_HWMON
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tristate "QCOM M4M cache monitor hardware"
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depends on ARCH_QCOM
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help
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QCOM M4M has counters that can be used to monitor requests coming to
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M4M. QCOM M4M hardware monitor device programs corresponding registers
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to monitor cache and inform governor. It can also set an IRQ when
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count exceeds a programmable limit.
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config DEVFREQ_GOV_QCOM_BW_HWMON
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tristate "HW monitor based governor for device BW"
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depends on QCOM_BIMC_BWMON
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help
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HW monitor based governor for device to DDR bandwidth voting.
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This governor sets the CPU BW vote by using BIMC counters to monitor
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the CPU's use of DDR. Since this uses target specific counters it
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can conflict with existing profiling tools. This governor is unlikely
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to be useful for non-QCOM devices.
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config DEVFREQ_GOV_QCOM_CACHE_HWMON
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tristate "HW monitor based governor for cache frequency"
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help
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HW monitor based governor for cache frequency scaling. This
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governor sets the cache frequency by using PM counters to monitor the
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CPU's use of cache. Since this governor uses some of the PM counters
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it can conflict with existing profiling tools. This governor is
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unlikely to be useful for other devices.
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config DEVFREQ_GOV_SPDM_HYP
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bool "QTI SPDM Hypervisor Governor"
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depends on ARCH_QCOM
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help
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Hypervisor based governor for CPU bandwidth voting
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for QTI chipsets.
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Sets the frequency using a "on-demand" algorithm.
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This governor is unlikely to be useful for other devices.
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config DEVFREQ_GOV_MEMLAT
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tristate "HW monitor based governor for device BW"
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depends on ARM_MEMLAT_MON
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help
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HW monitor based governor for device to DDR bandwidth voting.
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This governor sets the CPU BW vote based on stats obtained from memalat
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monitor if it determines that a workload is memory latency bound. Since
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this uses target specific counters it can conflict with existing profiling
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tools.
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comment "DEVFREQ Drivers"
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config DEVFREQ_GOV_QCOM_ADRENO_TZ
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tristate "Qualcomm Technologies Inc Adreno Trustzone"
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depends on QCOM_KGSL && QCOM_SCM
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help
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Trustzone based governor for the Adreno GPU. Sets
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the frequency using a "on-demand" algorithm. This
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governor is unlikely to be useful for other
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devices.
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config DEVFREQ_GOV_QCOM_GPUBW_MON
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tristate "GPU BW voting governor"
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depends on DEVFREQ_GOV_QCOM_ADRENO_TZ
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help
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This governor works together with Adreno Trustzone governor,
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and select bus frequency votes using an "on-demand" alorithm.
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This governor is unlikely to be useful for non-Adreno
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devices.
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config ARM_EXYNOS_BUS_DEVFREQ
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tristate "ARM EXYNOS Generic Memory Bus DEVFREQ Driver"
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depends on ARCH_EXYNOS || COMPILE_TEST
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select DEVFREQ_GOV_SIMPLE_ONDEMAND
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select DEVFREQ_GOV_PASSIVE
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select DEVFREQ_EVENT_EXYNOS_PPMU
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select PM_DEVFREQ_EVENT
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select PM_OPP
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help
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This adds the common DEVFREQ driver for Exynos Memory bus. Exynos
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Memory bus has one more group of memory bus (e.g, MIF and INT block).
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Each memory bus group could contain many memoby bus block. It reads
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PPMU counters of memory controllers by using DEVFREQ-event device
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and adjusts the operating frequencies and voltages with OPP support.
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This does not yet operate with optimal voltages.
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config ARM_TEGRA_DEVFREQ
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tristate "Tegra DEVFREQ Driver"
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depends on ARCH_TEGRA_124_SOC
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select DEVFREQ_GOV_SIMPLE_ONDEMAND
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select PM_OPP
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help
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This adds the DEVFREQ driver for the Tegra family of SoCs.
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It reads ACTMON counters of memory controllers and adjusts the
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operating frequencies and voltages with OPP support.
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config ARM_RK3399_DMC_DEVFREQ
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tristate "ARM RK3399 DMC DEVFREQ Driver"
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depends on (ARCH_ROCKCHIP && HAVE_ARM_SMCCC) || \
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(COMPILE_TEST && HAVE_ARM_SMCCC)
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select DEVFREQ_EVENT_ROCKCHIP_DFI
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select DEVFREQ_GOV_SIMPLE_ONDEMAND
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select PM_DEVFREQ_EVENT
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select PM_OPP
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help
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This adds the DEVFREQ driver for the RK3399 DMC(Dynamic Memory Controller).
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It sets the frequency for the memory controller and reads the usage counts
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from hardware.
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config DEVFREQ_SIMPLE_DEV
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tristate "Device driver for simple clock device with no status info"
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select DEVFREQ_GOV_PERFORMANCE
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select DEVFREQ_GOV_POWERSAVE
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select DEVFREQ_GOV_USERSPACE
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select DEVFREQ_GOV_CPUFREQ
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help
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Device driver for simple devices that control their frequency using
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clock APIs and don't have any form of status reporting.
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config QCOM_DEVFREQ_DEVBW
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bool "Qualcomm Technologies Inc. DEVFREQ device for device master <-> slave IB/AB BW voting"
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depends on ARCH_QCOM
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select DEVFREQ_GOV_PERFORMANCE
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select DEVFREQ_GOV_POWERSAVE
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select DEVFREQ_GOV_USERSPACE
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select DEVFREQ_GOV_CPUFREQ
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default n
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help
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Different devfreq governors use this devfreq device to make CPU to
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DDR IB/AB bandwidth votes. This driver provides a SoC topology
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agnostic interface to so that some of the devfreq governors can be
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shared across SoCs.
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config SPDM_SCM
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bool "QTI SPDM SCM based call support"
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depends on DEVFREQ_SPDM
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help
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SPDM driver support the dcvs algorithm logic being accessed via
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scm or hvc calls. This adds the support for SPDM interaction to
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tz via SCM based call. If not selected then Hypervisor interaction
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will be activated.
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config DEVFREQ_SPDM
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bool "QTI SPDM based bandwidth voting"
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depends on ARCH_QCOM
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select DEVFREQ_GOV_SPDM_HYP
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help
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This adds the support for SPDM based bandwidth voting on QTI chipsets.
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This driver allows any SPDM based client to vote for bandwidth.
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Used with the QTI SPDM Hypervisor Governor.
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config DEVFREQ_GOV_CDSPL3
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bool "QTI DEVFREQ governor for CDSP L3 requests"
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depends on QCOM_CDSP_RM
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help
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CDSP resource manager will use this governor to vote for L3 clock
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for IO-coherent traffic generated from CDSP
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config DEVFREQ_BOOST
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bool "Devfreq Boost"
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help
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Boosts enumerated devfreq devices upon input, and allows for boosting
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specific devfreq devices on other custom events. The boost frequencies
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for this driver should be set so that frame drops are near-zero at the
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boosted frequencies and power consumption is minimized at said
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frequencies. The goal of this driver is to provide an interface to
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achieve optimal device performance by requesting boosts on key events,
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such as when a frame is ready to rendered to the display.
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if DEVFREQ_BOOST
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config DEVFREQ_INPUT_BOOST_DURATION_MS
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int "Input boost duration"
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default "100"
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help
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Input boost duration in milliseconds for all boostable devices.
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config DEVFREQ_WAKE_BOOST_DURATION_MS
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int "Wake boost duration"
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default "1000"
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help
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Wake boost duration in milliseconds for all boostable devices.
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config DEVFREQ_CPU_LLCC_DDR_BW_BOOST_FREQ
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int "Boost freq for cpu-llcc-ddr-bw device"
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default "0"
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help
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Boost frequency for the MSM DDR bus.
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endif
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source "drivers/devfreq/event/Kconfig"
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endif # PM_DEVFREQ
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