Add tickless kernel support. Sets timer always in one
shot mode to the time the kernel scheduler needs the
next timer event. Uses mili seconds as the scheduling
time unit.
Jira: ZEP-1817
Change-Id: Ia2e63711cdd9d7d9c241b9ff08a606aa79575012
Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com>
Add tickless kernel support. Sets timer always in one
shot mode to the time the kernel scheduler needs the
next timer event. Uses mili seconds as the scheduling
time unit.
Jira: ZEP-1818
Change-Id: I21ce037b571c4c6ff588033a15aa49624cba7a57
Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com>
Add tickless kernel support. Sets timer always in one
shot mode to the time the kerneel scheduler needs the
next timer event. Uses mili seconds as the scheduling
time unit.
Jira: ZEP-1816
Change-Id: I85232b572759b9653c6396edc057ff4409525c97
Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com>
Update the timer to use the tickless kernel interface
provided by kernel to operate in event based mode. In
this mode, the timer would not generate periodic ticks
and would only be programmed in one shot mode. It would
announce elapsed time in wall time units instead of
ticks. Timer can also be disabled enabling waiting
forever for a non-timer event.
Jira: ZEP-1812
Change-Id: I13110b9fb53b33a9244cc91a3d991f8452d330b1
Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com>
Adds event based scheduling logic to the kernel. Updates
management of timeouts, timers, idling etc. based on
time tracked at events rather than periodic ticks. Provides
interfaces for timers to announce and get next timer expiry
based on kernel scheduling decisions involving time slicing
of threads, timeouts and idling. Uses wall time units instead
of ticks in all scheduling activities.
The implementation involves changes in the following areas
1. Management of time in wall units like ms/us instead of ticks
The existing implementation already had an option to configure
number of ticks in a second. The new implementation builds on
top of that feature and provides option to set the size of the
scheduling granurality to mili seconds or micro seconds. This
allows most of the current implementation to be reused. Due to
this re-use and co-existence with tick based kernel, the names
of variables may contain the word "tick". However, in the
tickless kernel implementation, it represents the currently
configured time unit, which would be be mili seconds or
micro seconds. The APIs that take time as a parameter are not
impacted and they continue to pass time in mili seconds.
2. Timers would not be programmed in periodic mode
generating ticks. Instead they would be programmed in one
shot mode to generate events at the time the kernel scheduler
needs to gain control for its scheduling activities like
timers, timeouts, time slicing, idling etc.
3. The scheduler provides interfaces that the timer drivers
use to announce elapsed time and get the next time the scheduler
needs a timer event. It is possible that the scheduler may not
need another timer event, in which case the system would wait
for a non-timer event to wake it up if it is idling.
4. New APIs are defined to be implemented by timer drivers. Also
they need to handler timer events differently. These changes
have been done in the HPET timer driver. In future other timers
that support tickles kernel should implement these APIs as well.
These APIs are to re-program the timer, update and announce
elapsed time.
5. Philosopher and timer_api applications have been enabled to
test tickless kernel. Separate configuration files are created
which define the necessary CONFIG flags. Run these apps using
following command
make pristine && make BOARD=qemu_x86 CONF_FILE=prj_tickless.conf qemu
Jira: ZEP-339 ZEP-1946 ZEP-948
Change-Id: I7d950c31bf1ff929a9066fad42c2f0559a2e5983
Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com>
Convert code to use u{8,16,32,64}_t and s{8,16,32,64}_t instead of C99
integer types. This handles the remaining includes and kernel, plus
touching up various points that we skipped because of include
dependancies. We also convert the PRI printf formatters in the arch
code over to normal formatters.
Jira: ZEP-2051
Change-Id: Iecbb12601a3ee4ea936fd7ddea37788a645b08b0
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
Convert code to use u{8,16,32,64}_t and s{8,16,32,64}_t instead of C99
integer types.
Jira: ZEP-2051
Change-Id: I08f51e2bfd475f6245771c1bd2df7ffc744c48c4
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
This is a start to move away from the C99 {u}int{8,16,32,64}_t types to
Zephyr defined u{8,16,32,64}_t and s{8,16,32,64}_t. This allows Zephyr
to define the sized types in a consistent manor across all the
architectures we support and not conflict with what various compilers
and libc might do with regards to the C99 types.
We introduce <zephyr/types.h> as part of this and have it include
<stdint.h> for now until we transition all the code away from the C99
types.
We go with u{8,16,32,64}_t and s{8,16,32,64}_t as there are some
existing variables defined u8 & u16 as well as to be consistent with
Zephyr naming conventions.
Jira: ZEP-2051
Change-Id: I451fed0623b029d65866622e478225dfab2c0ca8
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
Fix doxygen comment typos used to generate API docs
Change-Id: I6fd5051c99bdcc731740c92001e525349c254d85
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
CONFIG_* usually come from Kconfig, rename variables that are locally
defined to avoid confusion about where they are set.
Change-Id: I83b8459913c5deb68dc1b9f5386b8934363a6d1f
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Rearming the riscv machine timer is done by first updating the
mtimecmp low value register. If the low value is updated with a
relatively small value, a timer interrupt can be generated while
updating the mtimecmp high value.
To avoid such a spurious interrupt to occur, disable the timer
interrupt while rearming the timer.
Change-Id: I50ab3f19554a9a8dfe70943b6da0d20be3de88dc
Signed-off-by: Jean-Paul Etienne <fractalclone@gmail.com>
Clear pending IRQ when starting and restore back the RTC1 state when
disabling sys_clock, to avoid issues when soft rebooting the device or
chainloading another Zephyr image (e.g. mcuboot).
Change-Id: I693d9168196ad2cfb8475ecfa2051eac043b1fbd
Signed-off-by: Ricardo Salveti <ricardo.salveti@linaro.org>
We need to account for the interrupt happening in the middle
of the calculation.
Issue: ZEP-1546
Change-Id: I193534856d7521cac7ca354d3e5b65e93b984bb1
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Fixes an unlikely issue that could arise if the RTC handler in the nRF RTC
driver was blocked for more than one sys tick interval. This could lead to
_sys_clock_tick_announce() being called with more than one sys tick when the
kernel did not expect it.
Jira: ZEP-1763
Change-ID: I5608fca6f0ac97a17c1ce452c1c5c67696a49a9a
Signed-off-by: Øyvind Hovdsveen <oyvind.hovdsveen@nordicsemi.no>
The LOAPIC driver was doing this in a way susceptible to a very
nasty race condition: the CCR register could reset and be readable
before the associated interrupt could be delivered.
This resulted in a small window of time where CCR was reset, but
accumulated_cycle_count not updated, causing some calls to
k_cycle_get_32() to appear to jump backwards in time.
Just use the x86 TSC for these cycle timestamps. A divisor may be
provided in cases where the CPU clock speed is some multiple of
the bus speed. Modern x86 CPUs do not change their TSC rate even
when adjusting cpu frequency, so this should be a reliable timing
source.
Issue: ZEP-1546
Change-Id: I441bd8e32af866587a91f306e89e3fa0ece512b5
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
It's possible the timer interrupt could occur when performing the
computation, resulting in incorrect values returned.
It's still possible for bad values to be returned if the function is
called with interrupts locked, but that is only fixable with a second
timer source.
Issue: ZEP-1546
Change-Id: I16d5b04c3e32377f7249eb4fb1bf2f7c22bd0836
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This is a reworked version of the previous RTC driver. The main
changed is related to the handling _timer_idle_exit() on non-RTC
wake-ups. The previous version didn't announce the elapsed time
to the kernel in _timer_idle_exit(). Additionally, the driver now
makes sure never to announce more idle ticks than the kernel asked
for, since the kernel does not handle negative deltas in its timeout
queues.
Change-Id: I312a357a7ce8f0c22adf5153731064b92870e47e
Signed-off-by: Wojciech Bober <wojciech.bober@nordicsemi.no>
Signed-off-by: Øyvind Hovdsveen <oyvind.hovdsveen@nordicsemi.no>
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
Some arches may want to define this as an inline function, or
define in core arch code instead of timer driver code.
Unfortunately, this means we need to remove from the footprint
tests, but this is not typically a large function.
Issue: ZEP-1546
Change-Id: Ic0d7a33507da855995838f4703d872cd613a2ca2
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
On Nios II the same timer peripheral IP block can't function
as a periodic system timer and a high-resolution timestamp source.
A second timer instance with different configuration is required.
Until that is implemented, just return the accumulated cycle count.
Issue: ZEP-1546
Change-Id: If3dcebdc60334bf3aa0ab45ccd82f1b2531b6bc1
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
There are race conditions trying to coordinate the value between
the accumulated_cycle_count (updated at interrupt time) and
trying to compute the delta from the last interrupt using the
mtime registers. An unlucky call could result in the timestamp
appearing to move backwards in time.
the 'mtime' register isn't reset at every interrupt. Since we just
want a cycle counter, report its raw value.
Issue: ZEP-1546
Change-Id: I9f404b33214d6502fea47374fcf0ecbf84ef8136
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This driver was written for v1.5 before the introduction of the function
_sys_clock_final_tick_announce. At that time _sys_idle_elapsed_ticks was reset
to 0 automatically. Now that it is reset by the new function, the driver needed
to be fixed.
Change-Id: I039b4dbacb691aaf992b37e44404abd19a54a833
Signed-off-by: Mazen NEIFER <mazen@nestwave.com>
This is needed by next commit as some assembly files handling interrupts use
some options from this file.
This file is not included in next commit to separate code and build system
aptches.
Change-Id: Iff3a8019362599beb0c0058c3169480fa5183c1c
Signed-off-by: Mazen NEIFER <mazen@nestwave.com>
Enabling the riscv_machine_timer driver by default for riscv32
causes compilation issues on riscv32 boards (like zedboard_pulpino)
not supporting it.
Boards supporting the driver enable it via their respective
config file.
Change-Id: Ieb0d25fa339834fd386ae2725f40b6b7b72dc52b
Signed-off-by: Jean-Paul Etienne <fractalclone@gmail.com>
This flag is no longer necessary and TICKLESS_IDLE will be
enabled by default if SYS_POWER_MANAGEMENT is enabled.
Jira: ZEP-1325
Change-Id: Ic6cd4b8dc0a17c6a413cabf6509b215a4558318d
Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com>
riscv defines the machine-mode timer registers that are implemented
by the all riscv SOCs that follow the riscv privileged architecture
specification.
The timer registers implemented in riscv-qemu follow this specification.
To account for future riscv SOCs, reimplement the riscv_qemu_driver by
the riscv_machine_driver.
Change-Id: I645b03c91b4e07d0f2609908decc27ba9b8240d4
Signed-off-by: Jean-Paul Etienne <fractalclone@gmail.com>
Replace _ScbExcPrioSet with calls to NVIC_SetPriority as it handles both
interrupt and exception priorities. We don't need to shift around the
priority values for NVIC_SetPriority.
Jira: ZEP-1568
Change-Id: Iccd68733c3f7faa82b7ccb17200eef328090b6da
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
Convert driver to use the CMSIS NVIC APIs rather than the internal ones
so we can remove them in the future.
Change-Id: I31c2f37bc0aa35668a441f4ef2821b768dd7b817
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
Remove use of __scs structures and defines in place of CMSIS defined
ones. Also, use __ISB() instead of inline asm.
Jira: ZEP-1568
Change-Id: I8798206a12680f6c50105c7c28112632ac9dde50
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
Replace the existing Apache 2.0 boilerplate header with an SPDX tag
throughout the zephyr code tree. This patch was generated via a
script run over the master branch.
Also updated doc/porting/application.rst that had a dependency on
line numbers in a literal include.
Manually updated subsys/logging/sys_log.c that had a malformed
header in the original file. Also cleanup several cases that already
had a SPDX tag and we either got a duplicate or missed updating.
Jira: ZEP-1457
Change-Id: I6131a1d4ee0e58f5b938300c2d2fc77d2e69572c
Signed-off-by: David B. Kinder <david.b.kinder@intel.com>
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
The riscv-qemu timer driver does not implement
TICKLESS_IDLE
Change-Id: I3eeb5abb05b3f16b55ab9343c2045295b3010cfd
Signed-off-by: Jean-Paul Etienne <fractalclone@gmail.com>
The pulpino_timer driver does not implement TICKLESS_IDLE
for the time being.
Change-Id: I0cce8c8a7e203d551a924863462e6c86af4c98ff
Signed-off-by: Jean-Paul Etienne <fractalclone@gmail.com>
Force-align all variables defined via asm .word to ensure 4-byte
alignment.
The straddled_tick_on_idle_enter variable was a bool, which resolved in
an one-byte quantity. Changing it to a 32-bit integer. It would have
occupied 4 bytes anyway with alignment.
Fixes ZEP-1549.
Change-Id: If5e0aa1a75dbc73d896b44616f059d221fe191c6
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
On the nRF5x platforms we need always need the NRF_RTC_TIMER and it
depends on the CLOCK_CONTROL_NRF5. So enable all of these always.
Fixes issues if one tries to build nRF5x platforms w/o CONFIG_BLUETOOTH.
Change-Id: I0f9af785e785f37ec289a935ddf70ee6dec08cd4
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
rename NANOKERNEL_TICKLESS_IDLE_SUPPORTED to
TICKLESS_IDLE_SUPPORTED and remove nanokernel occurances in Kconfig
files.
Make TICKLESS_IDLE depend on hardware that supports it.
Change-Id: I6a2e4fb0f7cf4b45475b48e71823ea089ee98759
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
PRINTK was conflicting, reanme to DBG.
Jira: ZEP-953
Change-Id: If5d6ef385c5ed223f6f7eae9bde887ae4a1b946a
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
That module is not used anymore: it was introduced pre-Zephyr to add
some kind of awareness when debugging ARM Cortex-M3 code with GDB but
was never really used by anyone. It has bitrotted, and with the recent
move of the tTCS and tNANO data structures to common _kernel and
k_thread, it does not even compile anymore.
Jira: ZEP-1284, ZEP-951
Change-Id: Ic9afed00f4229324fe5d2aa97dc6f1c935953244
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
The nRF RTC driver, which is used a system clock driver due to the lack
of SysTick hardware on the SoC, was using too much CPU time in its
_timer_idle_exit() implementation due to the use of 64-bit arithmetical
operations. This was causing the ISR wrapper to add excessive latency to
critical interrupts, causing BLE controller asserts.
This patch addresses the issue by using exclusively RTC ticks instead of
OS ticks, thus avoiding the necessity to convert during
_timer_idle_exit() calls, which are the most critical to interrupt
latency.
In addition the driver is now able to detect setting tick events in the
past due to it being interrupted by a higher priority context, and will
reschedule and trigger the ISR at the same time.
Change-id: I56a3be96b9fdd554c3650012d647af2f0415eb8a
Signed-off-by: Vinayak Chettimada <vinayak.kariappa.chettimada@nordicsemi.no>
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
When going into DEEP_SLEEP state, the ARC timer
needs to be restored.
This implements the function to restore the timer
after sleep.
As the time spent during sleep is not currently known,
the timer is expired to reschedule the application task.
Jira: ZEP-1224
Change-Id: I22a30d0fd79f177cf166b9a29dc78d68f7d7fbad
Signed-off-by: Julien Delayen <julien.delayen@intel.com>
ccflags-y += -I$(srctree)/kernel/unified/include isn't need so lets
remove it.
Change-Id: I910bbac4a189de965d844f5fc36571e8dcb5705d
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
This commit replaces the nanokernel.h include by kernel.h.
Change-Id: Ib42fbf2d9f77a73c0831f569b3dbbfb342ea2e1d
Signed-off-by: Flavio Santes <flavio.santes@intel.com>
Ramesh Thomas