to see what features they may support before calling identify/probe/attach.
This is necessary because the ACPI 3.0 spec requires driver support be
advertised before running any methods. For now, the flags are as specified
in for the _PDC and _OSC methods but we can support private flags as needed.
Add an implementation of this for acpi_cpu. It checks all its children
(notably cpufreq drivers) and calls the _PDC method to report the results.
doing it in the cpu driver. The previous code was incorrect anyway since
this value controls Px states, not throttling as the comment said. Since
we didn't support Px states before, there was no impact. Also, note that
we delay the write to SMI_CMD until after booting is complete since it
sometimes triggers a change in the frequency and we want to have all
drivers ready to detect/handle this.
devclass. As pointed out by dfr@, devclasses don't have to share the same
linkage if multiple drivers have the same name. Newbus should match the
devclasses based on name and allocate non-conflicting unit numbers.
after boot so that PCI is initialized and we can probe for the problem
chipsets. Note that while probed but unusable states are disabled, they
aren't freed yet. In the future, it may make sense to detach them.
Tested by: Adam K Kirchoff <adamk at voicenet com>
MFC after: 2 days
* Fix a bug where caches were flushed on non-C3 transitions.
* Be sure a working flush cache instruction is present before using it.
* Disable C3 completely if it isn't present.
after. Unify the paths for all Cx states. Remove cpu_idle_busy and
instead do the little profiling we need before re-enabling interrupts.
Use 1 quantum as estimate for C1 sleep duration since the timer interrupt
is the main reason we wake.
While here, change the cx_history sysctl to cx_usage and report statistics
for which idle states were used in terms of percent. This seems more
intuitive than counters. Remove the cx_stats structure since it's no
longer used. Update the man page.
Change various types which do not need explicit size.
devices it cannot attach to. This gets rid of extraneous but harmless
device_probe_and_attach() errors. While I'm here, make the device
description more useful. The !acpi case for cpu is handled by legacy0.
globally available. acpi_TimerDelta() subtracts two readings from the
ACPI PM timer and returns the difference. It properly distinguishes between
24-bit and 32-bit timers and handles wraparound.
even though the spec mandates this. Some have a value of 5 to indicate
throttling + C2 and some have 7 to indicate an extra C3 state. Support
throttling if the value is >= 4, C2 for >= 5, and C3 for >= 6.
throttling values being available regardless of the CPU's capabilities.
This has been broken since rev 1.1. Also clarify a comment.
Submitted by: Taku YAMAMATO <taku@cent.saitama-u.ac.jp>
- Dynamically allocate the cpu_softc[] array based on mp_maxid instead of
using a statically sized array that depended on 'options SMP'.
- Use mp_maxid rather than MAXCPU when walking all the CPUs looking for a
match.
- Always call smp_rendezvous() since UP kernels now provide this.
- Use mp_ncpus rather than cpu_ndevices when determining if we need to
disable C3 for SMP machines.
Approved by: re (rwatson)
Reviewed by: njl
idx'th present CPU with pc_acpi_id equal to *acpi_id. If *acpi_id
does not match that processor's pc_acpi_id, return the value for
ProcId derived from the MADT in *acpi_id. If pc_acpi_id is 0xffffffff,
always override it with the value of *acpi_id. Finally, return
pc_cpuid in *cpu_id and use that as our primary key.
* Use pc_cpuid as our unique key because we know it is valid since
MD code set it. The values for ProcId in the ASL and MADT don't
match up on some machines (!), forcing us to fall back to ordered
probing in that case.
* Remove some #ifdef SMP since the refcount doesn't hurt performance
and will be needed for dynamic _CST objects. Only one #ifdef SMP
(for smp_rendezvous) remains.
* Hook up SMP in the compile flags in the Makefile.
Tested by: marcel, truckman
Approved by: re (scottl)
an acpi_cpu method for shutdown that disables entry to acpi_cpu_idle
and then IPIs/waits for threads to exit. This fixes a panic late in
reboot in the SMP case.
* In the !SMP case, don't use the processor id filled out by the MADT
since there can only be one processor. This was causing a panic in
acpi_cpu_idle if the id was 1 since the data was being dereferenced from
cpu_softc[1] even though the actual data was in cpu_softc[0] (which is
correct).
* Rework the initialization functions so that cpu_idle_hook is written
late in the boot process.
* Make the P_BLK, P_BLK_LEN, and cpu_cx_count all softc-local variables.
This will help SMP boxes that have _CST or multiple P_BLKs. No such
boxes are known at this time.
* Always allocate the C1 state, even if the P_BLK is invalid. This means
we will always take over idling if enabled. Remove the value -1 as
valid for cx_lowest since this is redundant with machdep.cpu_idle_hlt.
* Reduce locking for the throttle initialization case to around the write
to the smi_cmd port. Add disabled code to write the CST_CNT. It will
be enabled once _CST re-evaluation is tested (post 5.2R).
Thank you: dfr, imp, jhb, marcel, peter
Tested by: rwatson, Harald Schmalzbauer <h@schmalzbauer.de>
Approved by: re (rwatson)
* Use the cpu_idle_hook() to do idling for C1-C3.
* Use both _CST and the FADT to detect Cx states.
* Use both _PTC and P_CNT for controlling throttling.
* Add a notify handler to detect changes in _CST and _PSS
* Call the _INI function for each processor if present. This will be
done by ACPI-CA in the future.
* Fix a bug on SMP systems where CPUs will attach multiple times if the
bus is rescan.
* Document new sysctls for controlling idling.
This makes other power-management system (APM for now) to be able to
generate power profile change events (ie. AC-line status changes), and
other kernel components, not only the ACPI components, can be notified
the events.
- move subroutines in acpi_powerprofile.c (removed) to kern/subr_power.c
- call power_profile_set_state() also from APM driver when AC-line
status changes
- add call-back function for Crusoe LongRun controlling on power
profile changes for a example
disabled unless verbose flag is set. Also fix some messages in terms
of English.
The critical messages and error messages in probe/attach routine are
unchanged by this commit.
