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drivers/timer: Select tickless via driver kconfig flag

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Add a TICKLESS_CAPABLE kconfig variable which is used by the kernel to
select tickless mode's default automatically on drivers that support
it (rather than having to set the default per-board).  Select it from
the ARM SysTick and Intel HPET drivers.

Also remove the old qemu_cortex_m3 default settings which this
replaces.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit is contained in:
Andy Ross 2018-10-12 06:58:21 -07:00 • committed by Anas Nashif
commit c0a184c067
3 changed files with 13 additions and 8 deletions
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6
boards/arm/qemu_cortex_m3/Kconfig.defconfig
View file

@ -7,10 +7,4 @@ config BUILD_OUTPUT_BIN
config BOARD config BOARD
default "qemu_cortex_m3" default "qemu_cortex_m3"
config TICKLESS_IDLE
default y
config TICKLESS_KERNEL
default y
endif # BOARD_QEMU_CORTEX_M3 endif # BOARD_QEMU_CORTEX_M3

11
drivers/timer/Kconfig
View file

@ -132,6 +132,7 @@ config CORTEX_M_SYSTICK
bool "Cortex-M SYSTICK timer" bool "Cortex-M SYSTICK timer"
default y default y
depends on CPU_HAS_SYSTICK depends on CPU_HAS_SYSTICK
select TICKLESS_CAPABLE
help help
This module implements a kernel device driver for the Cortex-M processor This module implements a kernel device driver for the Cortex-M processor
SYSTICK timer and provides the standard "system clock driver" interfaces. SYSTICK timer and provides the standard "system clock driver" interfaces.
@ -242,6 +243,16 @@ config SYSTEM_CLOCK_INIT_PRIORITY
the clock to be running already, you should let the default value as it the clock to be running already, you should let the default value as it
is (0). is (0).
config TICKLESS_CAPABLE
bool "Timer driver supports tickless operation"
help
Timer drivers should select this flag if they are capable of
supporting tickless operation. That is, a call to
z_clock_set_timeout() with a number of ticks greater than
one should be expected not to produce a call to
z_clock_announce() (really, not to produce an interrupt at
all) until the specified expiration.
config QEMU_TICKLESS_WORKAROUND config QEMU_TICKLESS_WORKAROUND
bool "Disable tickless on qemu due to asynchrony bug" bool "Disable tickless on qemu due to asynchrony bug"
depends on QEMU_TARGET && TICKLESS_KERNEL depends on QEMU_TARGET && TICKLESS_KERNEL

4
kernel/Kconfig
View file

@ -677,7 +677,7 @@ endmenu
config TICKLESS_IDLE config TICKLESS_IDLE
bool "Tickless idle" bool "Tickless idle"
default y if SYS_POWER_MANAGEMENT default y if SYS_POWER_MANAGEMENT || TICKLESS_CAPABLE
help help
This option suppresses periodic system clock interrupts whenever the This option suppresses periodic system clock interrupts whenever the
kernel becomes idle. This permits the system to remain in a power kernel becomes idle. This permits the system to remain in a power
@ -696,7 +696,7 @@ config TICKLESS_IDLE_THRESH
config TICKLESS_KERNEL config TICKLESS_KERNEL
bool "Tickless kernel" bool "Tickless kernel"
default n default y if TICKLESS_CAPABLE
help help
This option enables a fully event driven kernel. Periodic system This option enables a fully event driven kernel. Periodic system
clock interrupt generation would be stopped at all times. This option clock interrupt generation would be stopped at all times. This option