| Commit message (Collapse) | Author | Age |
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_accelerate_cbs_unlocked().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_accelerate_cbs().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_gp_kthread_wake().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_future_gp_cleanup().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
check_cpu_stall().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
print_cpu_stall().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
print_other_cpu_stall().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_stall_kick_kthreads().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_dump_cpu_stacks().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_check_gp_kthread_starvation().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
record_gp_stall_check_time().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_get_root().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_gp_in_progress().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_report_qs_rdp().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_report_unblock_qs_rnp(), which is particularly appropriate in
this case given that this parameter is no longer used.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_report_qs_rsp().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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There now is only one rcu_state structure in a given build of the
Linux kernel, so there is no need to pass it as a parameter to RCU's
functions. This commit therefore removes the rsp parameter from
rcu_report_qs_rnp().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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The rcu_data_p pointer references the default set of per-CPU rcu_data
structures, that is, those that call_rcu() uses, as opposed to
call_rcu_bh() and sometimes call_rcu_sched(). But there is now only one
set of per-CPU rcu_data structures, so that one set is by definition
the default, which means that the rcu_data_p pointer no longer serves
any useful purpose. This commit therefore removes it.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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The rcu_state_p pointer references the default rcu_state structure,
that is, the one that call_rcu() uses, as opposed to call_rcu_bh()
and sometimes call_rcu_sched(). But there is now only one rcu_state
structure, so that one structure is by definition the default, which
means that the rcu_state_p pointer no longer serves any useful purpose.
This commit therefore removes it.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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The rcu_state structure's ->rda field was used to find the per-CPU
rcu_data structures corresponding to that rcu_state structure. But now
there is only one rcu_state structure (creatively named "rcu_state")
and one set of per-CPU rcu_data structures (creatively named "rcu_data").
Therefore, uses of the ->rda field can always be replaced by "rcu_data,
and this commit makes that change and removes the ->rda field.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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The rcu_state structure's ->call field references the corresponding RCU
flavor's call_rcu() function. However, now that there is only ever one
rcu_state structure in a given build of the Linux kernel, and that flavor
uses plain old call_rcu(), there is not a lot of point in continuing to
have the ->call field. This commit therefore removes it.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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Now that a given build of the Linux kernel has only one set of rcu_state,
rcu_node, and rcu_data structures, there is no point in creating a macro
to declare and compile-time initialize them. This commit therefore
just does normal declaration and compile-time initialization of these
structures. While in the area, this commit also removes #ifndefs of
the no-longer-ever-defined preprocessor macro RCU_TREE_NONCORE.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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This commit renames Tiny RCU functions so that the lowest level of
functionality is RCU (e.g., synchronize_rcu()) rather than RCU-sched
(e.g., synchronize_sched()). This provides greater naming compatibility
with Tree RCU, which will in turn permit more LoC removal once
the RCU-sched and RCU-bh update-side API is removed.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Fix Tiny call_rcu()'s EXPORT_SYMBOL() in response to a bug
report from kbuild test robot. ]
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Now that RCU-preempt knows about preemption disabling, its implementation
of synchronize_rcu() works for synchronize_sched(), and likewise for the
other RCU-sched update-side API members. This commit therefore confines
the RCU-sched update-side code to CONFIG_PREEMPT=n builds, and defines
RCU-sched's update-side API members in terms of those of RCU-preempt.
This means that any given build of the Linux kernel has only one
update-side flavor of RCU, namely RCU-preempt for CONFIG_PREEMPT=y builds
and RCU-sched for CONFIG_PREEMPT=n builds. This in turn means that kernels
built with CONFIG_RCU_NOCB_CPU=y have only one rcuo kthread per CPU.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Andi Kleen <ak@linux.intel.com>
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The rcu_report_exp_rdp() function is always invoked with its "wake"
argument set to "true", so this commit drops this parameter. The only
potential call site that would use "false" is in the code driving the
expedited grace period, and that code uses rcu_report_exp_cpu_mult()
instead, which therefore retains its "wake" parameter.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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This commit updates comments and help text to account for the fact that
RCU-bh update-side functions are now simple wrappers for their RCU or
RCU-sched counterparts.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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Now that the main RCU API knows about softirq disabling and softirq's
quiescent states, the RCU-bh update code can be dispensed with.
This commit therefore removes the RCU-bh update-side implementation and
defines RCU-bh's update-side API in terms of that of either RCU-preempt or
RCU-sched, depending on the setting of the CONFIG_PREEMPT Kconfig option.
In kernels built with CONFIG_RCU_NOCB_CPU=y this has the knock-on effect
of reducing by one the number of rcuo kthreads per CPU.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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This commit reduces the latency of expedited RCU grace periods by
reporting a quiescent state for the CPU at context-switch time.
In CONFIG_PREEMPT=y kernels, if the outgoing task is still within an
RCU read-side critical section (and thus still blocking some grace
period, perhaps including this expedited grace period), then that task
will already have been placed on one of the leaf rcu_node structures'
->blkd_tasks list.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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One necessary step towards consolidating the three flavors of RCU is to
make sure that the resulting consolidated "one flavor to rule them all"
correctly handles networking denial-of-service attacks. One thing that
allows RCU-bh to do so is that __do_softirq() invokes rcu_bh_qs() every
so often, and so something similar has to happen for consolidated RCU.
This must be done carefully. For example, if a preemption-disabled
region of code takes an interrupt which does softirq processing before
returning, consolidated RCU must ignore the resulting rcu_bh_qs()
invocations -- preemption is still disabled, and that means an RCU
reader for the consolidated flavor.
This commit therefore creates a new rcu_softirq_qs() that is called only
from the ksoftirqd task, thus avoiding the interrupted-a-preempted-region
problem. This new rcu_softirq_qs() function invokes rcu_sched_qs(),
rcu_preempt_qs(), and rcu_preempt_deferred_qs(). The latter call handles
any deferred quiescent states.
Note that __do_softirq() still invokes rcu_bh_qs(). It will continue to
do so until a later stage of cleanup when the RCU-bh flavor is removed.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Fix !SMP issue located by kbuild test robot. ]
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RCU's dyntick-idle code is written to tolerate half-interrupts, that it,
either an interrupt that invokes rcu_irq_enter() but never invokes the
corresponding rcu_irq_exit() on the one hand, or an interrupt that never
invokes rcu_irq_enter() but does invoke the "corresponding" rcu_irq_exit()
on the other. These things really did happen at one time, as evidenced
by this ca-2011 LKML post:
http://lkml.kernel.org/r/20111014170019.GE2428@linux.vnet.ibm.com
The reason why RCU tolerates half-interrupts is that usermode helpers
used exceptions to invoke a system call from within the kernel such that
the system call did a normal return (not a return from exception) to
the calling context. This caused rcu_irq_enter() to be invoked without
a matching rcu_irq_exit(). However, usermode helpers have since been
rewritten to make much more housebroken use of workqueues, kernel threads,
and do_execve(), and therefore should no longer produce half-interrupts.
No one knows of any other source of half-interrupts, but then again,
no one seems insane enough to go audit the entire kernel to verify that
half-interrupts really are a relic of the past.
This commit therefore adds a pair of WARN_ON_ONCE() calls that will
trigger in the presence of half interrupts, which the code will continue
to handle correctly. If neither of these WARN_ON_ONCE() trigger by
mid-2021, then perhaps RCU can stop handling half-interrupts, which
would be a considerable simplification.
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Reported-by: Joel Fernandes <joel@joelfernandes.org>
Reported-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
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The ->b.exp_need_qs field is now set only to false, so this commit
removes it. The job this field used to do is now done by the rcu_data
structure's ->deferred_qs field, which is a consequence of a better
split between task-based (the rcu_node structure's ->exp_tasks field) and
CPU-based (the aforementioned rcu_data structure's ->deferred_qs field)
tracking of quiescent states for RCU-preempt expedited grace periods.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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If an RCU-preempt read-side critical section is exiting, that is,
->rcu_read_lock_nesting is negative, then it is a good time to look
at the possibility of reporting deferred quiescent states. This
commit therefore updates the checks in rcu_preempt_need_deferred_qs()
to allow exiting critical sections to report deferred quiescent states.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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This commit makes the "rcu" torture type test extended read-side
critical sections in order to test the deferral of RCU-preempt
quiescent-state testing.
In CONFIG_PREEMPT=n kernels, this simply duplicates the setup already
in place for the "sched" torture type.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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This commit defers reporting of RCU-preempt quiescent states at
rcu_read_unlock_special() time when any of interrupts, softirq, or
preemption are disabled. These deferred quiescent states are reported
at a later RCU_SOFTIRQ, context switch, idle entry, or CPU-hotplug
offline operation. Of course, if another RCU read-side critical
section has started in the meantime, the reporting of the quiescent
state will be further deferred.
This also means that disabling preemption, interrupts, and/or
softirqs will act as an RCU-preempt read-side critical section.
This is enforced by checking preempt_count() as needed.
Some special cases must be handled on an ad-hoc basis, for example,
context switch is a quiescent state even though both the scheduler and
do_exit() disable preemption. In these cases, additional calls to
rcu_preempt_deferred_qs() override the preemption disabling. Similar
logic overrides disabled interrupts in rcu_preempt_check_callbacks()
because in this case the quiescent state happened just before the
corresponding scheduling-clock interrupt.
In theory, this change lifts a long-standing restriction that required
that if interrupts were disabled across a call to rcu_read_unlock()
that the matching rcu_read_lock() also be contained within that
interrupts-disabled region of code. Because the reporting of the
corresponding RCU-preempt quiescent state is now deferred until
after interrupts have been enabled, it is no longer possible for this
situation to result in deadlocks involving the scheduler's runqueue and
priority-inheritance locks. This may allow some code simplification that
might reduce interrupt latency a bit. Unfortunately, in practice this
would also defer deboosting a low-priority task that had been subjected
to RCU priority boosting, so real-time-response considerations might
well force this restriction to remain in place.
Because RCU-preempt grace periods are now blocked not only by RCU
read-side critical sections, but also by disabling of interrupts,
preemption, and softirqs, it will be possible to eliminate RCU-bh and
RCU-sched in favor of RCU-preempt in CONFIG_PREEMPT=y kernels. This may
require some additional plumbing to provide the network denial-of-service
guarantees that have been traditionally provided by RCU-bh. Once these
are in place, CONFIG_PREEMPT=n kernels will be able to fold RCU-bh
into RCU-sched. This would mean that all kernels would have but
one flavor of RCU, which would open the door to significant code
cleanup.
Moving to a single flavor of RCU would also have the beneficial effect
of reducing the NOCB kthreads by at least a factor of two.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Apply rcu_read_unlock_special() preempt_count() feedback
from Joel Fernandes. ]
[ paulmck: Adjust rcu_eqs_enter() call to rcu_preempt_deferred_qs() in
response to bug reports from kbuild test robot. ]
[ paulmck: Fix bug located by kbuild test robot involving recursion
via rcu_preempt_deferred_qs(). ]
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When entering or exiting irq or NMI handlers, the current code uses
->dynticks_nmi_nesting to detect if it is in the outermost handler,
that is, the one interrupting or returning to an RCU-idle context (the
idle loop or nohz_full usermode execution). When entering the outermost
handler via an interrupt (as opposed to NMI), it is necessary to invoke
rcu_dynticks_task_exit() just before the CPU is marked non-idle from an
RCU perspective and to invoke rcu_cleanup_after_idle() just after the
CPU is marked non-idle. Similarly, when exiting the outermost handler
via an interrupt, it is necessary to invoke rcu_prepare_for_idle() just
before marking the CPU idle and to invoke rcu_dynticks_task_enter()
just after marking the CPU idle.
The decision to execute these four functions is currently taken in
rcu_irq_enter() and rcu_irq_exit() as follows:
rcu_irq_enter()
/* A conditional branch with ->dynticks_nmi_nesting */
rcu_nmi_enter()
/* A conditional branch with ->dynticks */
/* A conditional branch with ->dynticks_nmi_nesting */
rcu_irq_exit()
/* A conditional branch with ->dynticks_nmi_nesting */
rcu_nmi_exit()
/* A conditional branch with ->dynticks_nmi_nesting */
/* A conditional branch with ->dynticks_nmi_nesting */
rcu_nmi_enter()
/* A conditional branch with ->dynticks */
rcu_nmi_exit()
/* A conditional branch with ->dynticks_nmi_nesting */
This works, but the conditional branches in rcu_irq_enter() and
rcu_irq_exit() are redundant with those in rcu_nmi_enter() and
rcu_nmi_exit(), respectively. Redundant branches are not something
we want in the to/from-idle fastpaths, so this commit refactors
rcu_{nmi,irq}_{enter,exit}() so they use a common inlined function passed
a constant argument as follows:
rcu_irq_enter() inlining rcu_nmi_enter_common(irq=true)
/* A conditional branch with ->dynticks */
rcu_irq_exit() inlining rcu_nmi_exit_common(irq=true)
/* A conditional branch with ->dynticks_nmi_nesting */
rcu_nmi_enter() inlining rcu_nmi_enter_common(irq=false)
/* A conditional branch with ->dynticks */
rcu_nmi_exit() inlining rcu_nmi_exit_common(irq=false)
/* A conditional branch with ->dynticks_nmi_nesting */
The combination of the constant function argument and the inlining allows
the compiler to discard the conditionals that previously controlled
execution of rcu_dynticks_task_exit(), rcu_cleanup_after_idle(),
rcu_prepare_for_idle(), and rcu_dynticks_task_enter(). This reduces both
the to-idle and from-idle path lengths by two conditional branches each,
and improves readability as well.
This commit also changes order of execution from this:
rcu_dynticks_task_exit();
rcu_dynticks_eqs_exit();
trace_rcu_dyntick();
rcu_cleanup_after_idle();
To this:
rcu_dynticks_task_exit();
rcu_dynticks_eqs_exit();
rcu_cleanup_after_idle();
trace_rcu_dyntick();
In other words, the calls to rcu_cleanup_after_idle() and
trace_rcu_dyntick() are reversed. This has no functional effect because
the real concern is whether a given call is before or after the call to
rcu_dynticks_eqs_exit(), and this patch does not change that. Before the
call to rcu_dynticks_eqs_exit(), RCU is not yet watching the current
CPU and after that call RCU is watching.
A similar switch in calling order happens on the idle-entry path, with
similar lack of effect for the same reasons.
Suggested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Byungchul Park <byungchul.park@lge.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
[ paulmck: Applied Steven Rostedt feedback. ]
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management updates from Rafael Wysocki:
"These make hibernation on 32-bit x86 systems work in all of the cases
in which it works on 64-bit x86 ones, update the menu cpuidle governor
and the "polling" state to make them more efficient, add more hardware
support to cpufreq drivers and fix issues with some of them, fix a bug
in the conservative cpufreq governor, fix the operating performance
points (OPP) framework and make it more stable, update the devfreq
subsystem to take changes in the APIs used by into account and clean
up some things all over.
Specifics:
- Backport hibernation bug fixes from x86-64 to x86-32 and
consolidate hibernation handling on x86 to allow 32-bit systems to
work in all of the cases in which 64-bit ones work (Zhimin Gu, Chen
Yu).
- Fix hibernation documentation (Vladimir D. Seleznev).
- Update the menu cpuidle governor to fix a couple of issues with it,
make it more efficient in some cases and clean it up (Rafael
Wysocki).
- Rework the cpuidle polling state implementation to make it more
efficient (Rafael Wysocki).
- Clean up the cpuidle core somewhat (Fieah Lim).
- Fix the cpufreq conservative governor to take policy limits into
account properly in some cases (Rafael Wysocki).
- Add support for retrieving guaranteed performance information to
the ACPI CPPC library and make the intel_pstate driver use it to
expose the CPU base frequency via sysfs on systems with the
hardware-managed P-states (HWP) feature enabled (Srinivas
Pandruvada).
- Fix clang warning in the CPPC cpufreq driver (Nathan Chancellor).
- Get rid of device_node.name printing from cpufreq (Rob Herring).
- Remove unnecessary unlikely() from the cpufreq core (Igor Stoppa).
- Add support for the r8a7744 SoC to the cpufreq-dt driver (Biju
Das).
- Update the dt-platdev cpufreq driver to allow RK3399 to have
separate tunables per cluster (Dmitry Torokhov).
- Fix the dma_alloc_coherent() usage in the tegra186 cpufreq driver
(Christoph Hellwig).
- Make the imx6q cpufreq driver read OCOTP through nvmem for
imx6ul/imx6ull (Anson Huang).
- Fix several bugs in the operating performance points (OPP)
framework and make it more stable (Viresh Kumar, Dave Gerlach).
- Update the devfreq subsystem to take changes in the APIs used by
into account, fix some issues with it and make it stop print
device_node.name directly (Bjorn Andersson, Enric Balletbo i Serra,
Matthias Kaehlcke, Rob Herring, Vincent Donnefort, zhong jiang).
- Prepare the generic power domains (genpd) framework for dealing
with domains containing CPUs (Ulf Hansson).
- Prevent sysfs attributes representing low-power S0 residency
counters from being exposed if low-power S0 support is not
indicated in ACPI FADT (Rajneesh Bhardwaj).
- Get rid of custom CPU features macros for Intel CPUs from the
intel_idle and RAPL drivers (Andy Shevchenko).
- Update the tasks freezer to list tasks that refused to freeze and
caused a system transition to a sleep state to be aborted (Todd
Brandt).
- Update the pm-graph set of tools to v5.2 (Todd Brandt).
- Fix some issues in the cpupower utility (Anders Roxell, Prarit
Bhargava)"
* tag 'pm-4.20-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (73 commits)
PM / Domains: Document flags for genpd
PM / Domains: Deal with multiple states but no governor in genpd
PM / Domains: Don't treat zero found compatible idle states as an error
cpuidle: menu: Avoid computations when result will be discarded
cpuidle: menu: Drop redundant comparison
cpufreq: tegra186: don't pass GFP_DMA32 to dma_alloc_coherent()
cpufreq: conservative: Take limits changes into account properly
Documentation: intel_pstate: Add base_frequency information
cpufreq: intel_pstate: Add base_frequency attribute
ACPI / CPPC: Add support for guaranteed performance
cpuidle: menu: Simplify checks related to the polling state
PM / tools: sleepgraph and bootgraph: upgrade to v5.2
PM / tools: sleepgraph: first batch of v5.2 changes
cpupower: Fix coredump on VMWare
cpupower: Fix AMD Family 0x17 msr_pstate size
cpufreq: imx6q: read OCOTP through nvmem for imx6ul/imx6ull
cpufreq: dt-platdev: allow RK3399 to have separate tunables per cluster
cpuidle: poll_state: Revise loop termination condition
cpuidle: menu: Move the latency_req == 0 special case check
cpuidle: menu: Avoid computations for very close timers
...
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* acpi-pm:
ACPI / PM: LPIT: Register sysfs attributes based on FADT
* pm-sleep:
x86-32, hibernate: Adjust in_suspend after resumed on 32bit system
x86-32, hibernate: Set up temporary text mapping for 32bit system
x86-32, hibernate: Switch to relocated restore code during resume on 32bit system
x86-32, hibernate: Switch to original page table after resumed
x86-32, hibernate: Use the page size macro instead of constant value
x86-32, hibernate: Use temp_pgt as the temporary page table
x86, hibernate: Rename temp_level4_pgt to temp_pgt
x86-32, hibernate: Enable CONFIG_ARCH_HIBERNATION_HEADER on 32bit system
x86, hibernate: Extract the common code of 64/32 bit system
x86-32/asm/power: Create stack frames in hibernate_asm_32.S
PM / hibernate: Check the success of generating md5 digest before hibernation
x86, hibernate: Fix nosave_regions setup for hibernation
PM / sleep: Show freezing tasks that caused a suspend abort
PM / hibernate: Documentation: fix image_size default value
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For debug purposes it would be nice to see which tasks
caused a suspend abort, i.e. which tasks were still
in the process of freezing when a wakeup event occurred.
This patch adds the info to pm_debug_messages.
Signed-off-by: Todd Brandt <todd.e.brandt@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
Pull regulator updates from Mark Brown:
"The biggest chunk of the regulator changes for this release outside of
the new drivers is the conversion of the fixed regulator to use the
GPIO descriptor API, there's a small addition to the GPIO API plus a
bunch of updates to board files to implement it. This is some really
welcome work from Linus Walleij that's had a bunch of review and has
been sitting in -next for a while so I'm fairly happy there's no major
issues.
- Helpers for overlapping linear ranges.
- Display opmode and consumer requested load in the regualtor_summary
file in debugfs, plus a fix there.
- Support for the fun and entertaining power off mechanism that the
pfuze100 hardware implements.
- Conversion of the fixed regulator API to use GPIO descriptors,
including pulling in a bunch of patches to a bunch of board files.
- New drivers for Cirrus Logic Lochnagar, Qualcomm PMS405, Rohm
BD71847, ST PMIC1, and TI LM363x devices"
* tag 'regulator-v5.0' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator: (36 commits)
regulator: lochnagar: Use a consisent comment style for SPDX header
regulator: bd718x7: Remove struct bd718xx_pmic
regulator: Fetch enable gpiods nonexclusive
regulator/gpio: Allow nonexclusive GPIO access
regulator: lochnagar: Add support for the Cirrus Logic Lochnagar
regulator: stpmic1: Return REGULATOR_MODE_INVALID for invalid mode
regulator: stpmic1: add stpmic1 regulator driver
dt-bindings: regulator: document stpmic1 pmic regulators
regulator: axp20x: Mark expected switch fall-throughs
regulator: bd718xx: fix build warning on x86_64
regulator: fixed: Default enable high on DT regulators
regulator: bd718xx: rename bd71837 to 718xx
regulator: bd718XX use pickable ranges
regulator/mfd: bd718xx: rename bd71837/bd71847 common instances
regulator: Support regulators where voltage ranges are selectable
mfd: dt bindings: add BD71847 device-tree binding documentation
regulator: dt bindings: add BD71847 device-tree binding documentation
regulator/mfd: Support ROHM BD71847 power management IC
regulator: da905{2,5}: Remove unnecessary array check
regulator: qcom: Add PMS405 regulators
...
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'regulator/topic/pfuze100' into regulator-next
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Export pm_power_off_prepare. It is needed to implement power off on
Freescale/NXP iMX6 based boards with external power management
integrated circuit (PMIC).
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Pull dma mapping updates from Christoph Hellwig:
"First batch of dma-mapping changes for 4.20.
There will be a second PR as some big changes were only applied just
before the end of the merge window, and I want to give them a few more
days in linux-next.
Summary:
- mostly more consolidation of the direct mapping code, including
converting over hexagon, and merging the coherent and non-coherent
code into a single dma_map_ops instance (me)
- cleanups for the dma_configure/dma_unconfigure callchains (me)
- better handling of dma_masks in odd setups (me, Alexander Duyck)
- better debugging of passing vmalloc address to the DMA API (Stephen
Boyd)
- CMA command line parsing fix (He Zhe)"
* tag 'dma-mapping-4.20' of git://git.infradead.org/users/hch/dma-mapping: (27 commits)
dma-direct: respect DMA_ATTR_NO_WARN
dma-mapping: translate __GFP_NOFAIL to DMA_ATTR_NO_WARN
dma-direct: document the zone selection logic
dma-debug: Check for drivers mapping invalid addresses in dma_map_single()
dma-direct: fix return value of dma_direct_supported
dma-mapping: move dma_default_get_required_mask under ifdef
dma-direct: always allow dma mask <= physiscal memory size
dma-direct: implement complete bus_dma_mask handling
dma-direct: refine dma_direct_alloc zone selection
dma-direct: add an explicit dma_direct_get_required_mask
dma-mapping: make the get_required_mask method available unconditionally
unicore32: remove swiotlb support
Revert "dma-mapping: clear dev->dma_ops in arch_teardown_dma_ops"
dma-mapping: support non-coherent devices in dma_common_get_sgtable
dma-mapping: consolidate the dma mmap implementations
dma-mapping: merge direct and noncoherent ops
dma-mapping: move the dma_coherent flag to struct device
MIPS: don't select DMA_MAYBE_COHERENT from DMA_PERDEV_COHERENT
dma-mapping: add the missing ARCH_HAS_SYNC_DMA_FOR_CPU_ALL declaration
dma-mapping: fix panic caused by passing empty cma command line argument
...
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Respect the DMA_ATTR_NO_WARN flags for allocations in dma-direct.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Robin Murphy <robin.murphy@arm.com>
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What we are doing here isn't quite obvious, so add a comment explaining
it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
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I recently debugged a DMA mapping oops where a driver was trying to map
a buffer returned from request_firmware() with dma_map_single(). Memory
returned from request_firmware() is mapped into the vmalloc region and
this isn't a valid region to map with dma_map_single() per the DMA
documentation's "What memory is DMA'able?" section.
Unfortunately, we don't really check that in the DMA debugging code, so
enabling DMA debugging doesn't help catch this problem. Let's add a new
DMA debug function to check for a vmalloc address or an invalid virtual
address and print a warning if this happens. This makes it a little
easier to debug these sorts of problems, instead of seeing odd behavior
or crashes when drivers attempt to map the vmalloc space for DMA.
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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It appears that in commit 9d7a224b463e ("dma-direct: always allow dma mask
<= physiscal memory size") the logic of the test was changed from a "<" to
a ">=" however I don't see any reason for that change. I am assuming that
there was some additional change planned, specifically I suspect the logic
was intended to be reversed and possibly used for a return. Since that is
the case I have gone ahead and done that.
This addresses issues I had on my system that prevented me from booting
with the above mentioned commit applied on an x86_64 system w/ Intel IOMMU.
Fixes: 9d7a224b463e ("dma-direct: always allow dma mask <= physiscal memory size")
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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This way an architecture with less than 4G of RAM can support dma_mask
smaller than 32-bit without a ZONE_DMA. Apparently that is a common
case on powerpc.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
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Instead of rejecting devices with a too small bus_dma_mask we can handle
by taking the bus dma_mask into account for allocations and bounce
buffering decisions.
Signed-off-by: Christoph Hellwig <hch@lst.de>
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We need to take the DMA offset and encryption bit into account when
selecting a zone. User the opportunity to factor out the zone
selection into a helper for reuse.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
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