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Message-ID: <20070926224230.GB23218@linux.intel.com>
Date: Wed, 26 Sep 2007 15:42:30 -0700
From: Mark Gross <mgross@...ux.intel.com>
To: linux-pm <linux-pm@...ts.linux-foundation.org>,
lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] QoS power Management enabling patch set
The following patch replaces latency.c with qos_params.c and fixes up
users of latency to use qos_params
Signed-off-by: Mark Gross <mgross@...ux.intel.com>
diff -urN -X linux-2.6.23-rc8/Documentation/dontdiff linux-2.6.23-rc8-qos/drivers/acpi/processor_idle.c linux-2.6.23-rc8-qos-nolatency.c/drivers/acpi/processor_idle.c
--- linux-2.6.23-rc8-qos/drivers/acpi/processor_idle.c 2007-09-26 13:54:28.000000000 -0700
+++ linux-2.6.23-rc8-qos-nolatency.c/drivers/acpi/processor_idle.c 2007-09-26 14:09:27.000000000 -0700
@@ -38,7 +38,7 @@
#include <linux/dmi.h>
#include <linux/moduleparam.h>
#include <linux/sched.h> /* need_resched() */
-#include <linux/latency.h>
+#include <linux/qos_params.h>
#include <linux/clockchips.h>
/*
@@ -605,7 +605,7 @@
if (cx->promotion.state &&
((cx->promotion.state - pr->power.states) <= max_cstate)) {
if (sleep_ticks > cx->promotion.threshold.ticks &&
- cx->promotion.state->latency <= system_latency_constraint()) {
+ cx->promotion.state->latency <= qos_requirement(QOS_CPU_DMA_LATENCY)) {
cx->promotion.count++;
cx->demotion.count = 0;
if (cx->promotion.count >=
@@ -649,7 +649,7 @@
* or if the latency of the current state is unacceptable
*/
if ((pr->power.state - pr->power.states) > max_cstate ||
- pr->power.state->latency > system_latency_constraint()) {
+ pr->power.state->latency > qos_requirement(QOS_CPU_DMA_LATENCY)) {
if (cx->demotion.state)
next_state = cx->demotion.state;
}
@@ -1173,7 +1173,7 @@
"maximum allowed latency: %d usec\n",
pr->power.state ? pr->power.state - pr->power.states : 0,
max_cstate, (unsigned)pr->power.bm_activity,
- system_latency_constraint());
+ qos_requirement(QOS_CPU_DMA_LATENCY));
seq_puts(seq, "states:\n");
@@ -1280,7 +1280,7 @@
max_cstate);
first_run++;
#ifdef CONFIG_SMP
- register_latency_notifier(&acpi_processor_latency_notifier);
+ qos_add_notifier(QOS_CPU_DMA_LATENCY, &acpi_processor_latency_notifier);
#endif
}
@@ -1354,7 +1354,7 @@
*/
cpu_idle_wait();
#ifdef CONFIG_SMP
- unregister_latency_notifier(&acpi_processor_latency_notifier);
+ qos_remove_notifier(QOS_CPU_DMA_LATENCY, &acpi_processor_latency_notifier);
#endif
}
diff -urN -X linux-2.6.23-rc8/Documentation/dontdiff linux-2.6.23-rc8-qos/drivers/net/wireless/ipw2100.c linux-2.6.23-rc8-qos-nolatency.c/drivers/net/wireless/ipw2100.c
--- linux-2.6.23-rc8-qos/drivers/net/wireless/ipw2100.c 2007-09-26 13:54:34.000000000 -0700
+++ linux-2.6.23-rc8-qos-nolatency.c/drivers/net/wireless/ipw2100.c 2007-09-26 14:09:27.000000000 -0700
@@ -162,7 +162,7 @@
#include <linux/firmware.h>
#include <linux/acpi.h>
#include <linux/ctype.h>
-#include <linux/latency.h>
+#include <linux/qos_params.h>
#include "ipw2100.h"
@@ -1701,7 +1701,7 @@
/* the ipw2100 hardware really doesn't want power management delays
* longer than 175usec
*/
- modify_acceptable_latency("ipw2100", 175);
+ qos_update_requirement(QOS_CPU_DMA_LATENCY, "ipw2100", 175);
/* If the interrupt is enabled, turn it off... */
spin_lock_irqsave(&priv->low_lock, flags);
@@ -1856,7 +1856,7 @@
ipw2100_disable_interrupts(priv);
spin_unlock_irqrestore(&priv->low_lock, flags);
- modify_acceptable_latency("ipw2100", INFINITE_LATENCY);
+ qos_update_requirement(QOS_CPU_DMA_LATENCY, "ipw2100", QOS_DEFAULT_VALUE);
#ifdef ACPI_CSTATE_LIMIT_DEFINED
if (priv->config & CFG_C3_DISABLED) {
@@ -6544,7 +6544,7 @@
if (ret)
goto out;
- set_acceptable_latency("ipw2100", INFINITE_LATENCY);
+ qos_add_requirement(QOS_CPU_DMA_LATENCY, "ipw2100", QOS_DEFAULT_VALUE);
#ifdef CONFIG_IPW2100_DEBUG
ipw2100_debug_level = debug;
ret = driver_create_file(&ipw2100_pci_driver.driver,
@@ -6566,7 +6566,7 @@
&driver_attr_debug_level);
#endif
pci_unregister_driver(&ipw2100_pci_driver);
- remove_acceptable_latency("ipw2100");
+ qos_remove_requirement(QOS_CPU_DMA_LATENCY, "ipw2100");
}
module_init(ipw2100_init);
diff -urN -X linux-2.6.23-rc8/Documentation/dontdiff linux-2.6.23-rc8-qos/include/linux/latency.h linux-2.6.23-rc8-qos-nolatency.c/include/linux/latency.h
--- linux-2.6.23-rc8-qos/include/linux/latency.h 2007-07-08 16:32:17.000000000 -0700
+++ linux-2.6.23-rc8-qos-nolatency.c/include/linux/latency.h 1969-12-31 16:00:00.000000000 -0800
@@ -1,25 +0,0 @@
-/*
- * latency.h: Explicit system-wide latency-expectation infrastructure
- *
- * (C) Copyright 2006 Intel Corporation
- * Author: Arjan van de Ven <arjan@...ux.intel.com>
- *
- */
-
-#ifndef _INCLUDE_GUARD_LATENCY_H_
-#define _INCLUDE_GUARD_LATENCY_H_
-
-#include <linux/notifier.h>
-
-void set_acceptable_latency(char *identifier, int usecs);
-void modify_acceptable_latency(char *identifier, int usecs);
-void remove_acceptable_latency(char *identifier);
-void synchronize_acceptable_latency(void);
-int system_latency_constraint(void);
-
-int register_latency_notifier(struct notifier_block * nb);
-int unregister_latency_notifier(struct notifier_block * nb);
-
-#define INFINITE_LATENCY 1000000
-
-#endif
diff -urN -X linux-2.6.23-rc8/Documentation/dontdiff linux-2.6.23-rc8-qos/kernel/latency.c linux-2.6.23-rc8-qos-nolatency.c/kernel/latency.c
--- linux-2.6.23-rc8-qos/kernel/latency.c 2007-07-08 16:32:17.000000000 -0700
+++ linux-2.6.23-rc8-qos-nolatency.c/kernel/latency.c 1969-12-31 16:00:00.000000000 -0800
@@ -1,280 +0,0 @@
-/*
- * latency.c: Explicit system-wide latency-expectation infrastructure
- *
- * The purpose of this infrastructure is to allow device drivers to set
- * latency constraint they have and to collect and summarize these
- * expectations globally. The cummulated result can then be used by
- * power management and similar users to make decisions that have
- * tradoffs with a latency component.
- *
- * An example user of this are the x86 C-states; each higher C state saves
- * more power, but has a higher exit latency. For the idle loop power
- * code to make a good decision which C-state to use, information about
- * acceptable latencies is required.
- *
- * An example announcer of latency is an audio driver that knowns it
- * will get an interrupt when the hardware has 200 usec of samples
- * left in the DMA buffer; in that case the driver can set a latency
- * constraint of, say, 150 usec.
- *
- * Multiple drivers can each announce their maximum accepted latency,
- * to keep these appart, a string based identifier is used.
- *
- *
- * (C) Copyright 2006 Intel Corporation
- * Author: Arjan van de Ven <arjan@...ux.intel.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; version 2
- * of the License.
- */
-
-#include <linux/latency.h>
-#include <linux/list.h>
-#include <linux/spinlock.h>
-#include <linux/slab.h>
-#include <linux/module.h>
-#include <linux/notifier.h>
-#include <linux/jiffies.h>
-#include <asm/atomic.h>
-
-struct latency_info {
- struct list_head list;
- int usecs;
- char *identifier;
-};
-
-/*
- * locking rule: all modifications to current_max_latency and
- * latency_list need to be done while holding the latency_lock.
- * latency_lock needs to be taken _irqsave.
- */
-static atomic_t current_max_latency;
-static DEFINE_SPINLOCK(latency_lock);
-
-static LIST_HEAD(latency_list);
-static BLOCKING_NOTIFIER_HEAD(latency_notifier);
-
-/*
- * This function returns the maximum latency allowed, which
- * happens to be the minimum of all maximum latencies on the
- * list.
- */
-static int __find_max_latency(void)
-{
- int min = INFINITE_LATENCY;
- struct latency_info *info;
-
- list_for_each_entry(info, &latency_list, list) {
- if (info->usecs < min)
- min = info->usecs;
- }
- return min;
-}
-
-/**
- * set_acceptable_latency - sets the maximum latency acceptable
- * @identifier: string that identifies this driver
- * @usecs: maximum acceptable latency for this driver
- *
- * This function informs the kernel that this device(driver)
- * can accept at most usecs latency. This setting is used for
- * power management and similar tradeoffs.
- *
- * This function sleeps and can only be called from process
- * context.
- * Calling this function with an existing identifier is valid
- * and will cause the existing latency setting to be changed.
- */
-void set_acceptable_latency(char *identifier, int usecs)
-{
- struct latency_info *info, *iter;
- unsigned long flags;
- int found_old = 0;
-
- info = kzalloc(sizeof(struct latency_info), GFP_KERNEL);
- if (!info)
- return;
- info->usecs = usecs;
- info->identifier = kstrdup(identifier, GFP_KERNEL);
- if (!info->identifier)
- goto free_info;
-
- spin_lock_irqsave(&latency_lock, flags);
- list_for_each_entry(iter, &latency_list, list) {
- if (strcmp(iter->identifier, identifier)==0) {
- found_old = 1;
- iter->usecs = usecs;
- break;
- }
- }
- if (!found_old)
- list_add(&info->list, &latency_list);
-
- if (usecs < atomic_read(¤t_max_latency))
- atomic_set(¤t_max_latency, usecs);
-
- spin_unlock_irqrestore(&latency_lock, flags);
-
- blocking_notifier_call_chain(&latency_notifier,
- atomic_read(¤t_max_latency), NULL);
-
- /*
- * if we inserted the new one, we're done; otherwise there was
- * an existing one so we need to free the redundant data
- */
- if (!found_old)
- return;
-
- kfree(info->identifier);
-free_info:
- kfree(info);
-}
-EXPORT_SYMBOL_GPL(set_acceptable_latency);
-
-/**
- * modify_acceptable_latency - changes the maximum latency acceptable
- * @identifier: string that identifies this driver
- * @usecs: maximum acceptable latency for this driver
- *
- * This function informs the kernel that this device(driver)
- * can accept at most usecs latency. This setting is used for
- * power management and similar tradeoffs.
- *
- * This function does not sleep and can be called in any context.
- * Trying to use a non-existing identifier silently gets ignored.
- *
- * Due to the atomic nature of this function, the modified latency
- * value will only be used for future decisions; past decisions
- * can still lead to longer latencies in the near future.
- */
-void modify_acceptable_latency(char *identifier, int usecs)
-{
- struct latency_info *iter;
- unsigned long flags;
-
- spin_lock_irqsave(&latency_lock, flags);
- list_for_each_entry(iter, &latency_list, list) {
- if (strcmp(iter->identifier, identifier) == 0) {
- iter->usecs = usecs;
- break;
- }
- }
- if (usecs < atomic_read(¤t_max_latency))
- atomic_set(¤t_max_latency, usecs);
- spin_unlock_irqrestore(&latency_lock, flags);
-}
-EXPORT_SYMBOL_GPL(modify_acceptable_latency);
-
-/**
- * remove_acceptable_latency - removes the maximum latency acceptable
- * @identifier: string that identifies this driver
- *
- * This function removes a previously set maximum latency setting
- * for the driver and frees up any resources associated with the
- * bookkeeping needed for this.
- *
- * This function does not sleep and can be called in any context.
- * Trying to use a non-existing identifier silently gets ignored.
- */
-void remove_acceptable_latency(char *identifier)
-{
- unsigned long flags;
- int newmax = 0;
- struct latency_info *iter, *temp;
-
- spin_lock_irqsave(&latency_lock, flags);
-
- list_for_each_entry_safe(iter, temp, &latency_list, list) {
- if (strcmp(iter->identifier, identifier) == 0) {
- list_del(&iter->list);
- newmax = iter->usecs;
- kfree(iter->identifier);
- kfree(iter);
- break;
- }
- }
-
- /* If we just deleted the system wide value, we need to
- * recalculate with a full search
- */
- if (newmax == atomic_read(¤t_max_latency)) {
- newmax = __find_max_latency();
- atomic_set(¤t_max_latency, newmax);
- }
- spin_unlock_irqrestore(&latency_lock, flags);
-}
-EXPORT_SYMBOL_GPL(remove_acceptable_latency);
-
-/**
- * system_latency_constraint - queries the system wide latency maximum
- *
- * This function returns the system wide maximum latency in
- * microseconds.
- *
- * This function does not sleep and can be called in any context.
- */
-int system_latency_constraint(void)
-{
- return atomic_read(¤t_max_latency);
-}
-EXPORT_SYMBOL_GPL(system_latency_constraint);
-
-/**
- * synchronize_acceptable_latency - recalculates all latency decisions
- *
- * This function will cause a callback to various kernel pieces that
- * will make those pieces rethink their latency decisions. This implies
- * that if there are overlong latencies in hardware state already, those
- * latencies get taken right now. When this call completes no overlong
- * latency decisions should be active anymore.
- *
- * Typical usecase of this is after a modify_acceptable_latency() call,
- * which in itself is non-blocking and non-synchronizing.
- *
- * This function blocks and should not be called with locks held.
- */
-
-void synchronize_acceptable_latency(void)
-{
- blocking_notifier_call_chain(&latency_notifier,
- atomic_read(¤t_max_latency), NULL);
-}
-EXPORT_SYMBOL_GPL(synchronize_acceptable_latency);
-
-/*
- * Latency notifier: this notifier gets called when a non-atomic new
- * latency value gets set. The expectation nof the caller of the
- * non-atomic set is that when the call returns, future latencies
- * are within bounds, so the functions on the notifier list are
- * expected to take the overlong latencies immediately, inside the
- * callback, and not make a overlong latency decision anymore.
- *
- * The callback gets called when the new latency value is made
- * active so system_latency_constraint() returns the new latency.
- */
-int register_latency_notifier(struct notifier_block * nb)
-{
- return blocking_notifier_chain_register(&latency_notifier, nb);
-}
-EXPORT_SYMBOL_GPL(register_latency_notifier);
-
-int unregister_latency_notifier(struct notifier_block * nb)
-{
- return blocking_notifier_chain_unregister(&latency_notifier, nb);
-}
-EXPORT_SYMBOL_GPL(unregister_latency_notifier);
-
-static __init int latency_init(void)
-{
- atomic_set(¤t_max_latency, INFINITE_LATENCY);
- /*
- * we don't want by default to have longer latencies than 2 ticks,
- * since that would cause lost ticks
- */
- set_acceptable_latency("kernel", 2*1000000/HZ);
- return 0;
-}
-
-module_init(latency_init);
diff -urN -X linux-2.6.23-rc8/Documentation/dontdiff linux-2.6.23-rc8-qos/kernel/Makefile linux-2.6.23-rc8-qos-nolatency.c/kernel/Makefile
--- linux-2.6.23-rc8-qos/kernel/Makefile 2007-09-26 14:06:38.000000000 -0700
+++ linux-2.6.23-rc8-qos-nolatency.c/kernel/Makefile 2007-09-26 14:10:15.000000000 -0700
@@ -8,7 +8,7 @@
signal.o sys.o kmod.o workqueue.o pid.o \
rcupdate.o extable.o params.o posix-timers.o \
kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
- hrtimer.o rwsem.o latency.o nsproxy.o srcu.o die_notifier.o \
+ hrtimer.o rwsem.o nsproxy.o srcu.o die_notifier.o \
utsname.o qos_params.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
diff -urN -X linux-2.6.23-rc8/Documentation/dontdiff linux-2.6.23-rc8-qos/sound/core/pcm_native.c linux-2.6.23-rc8-qos-nolatency.c/sound/core/pcm_native.c
--- linux-2.6.23-rc8-qos/sound/core/pcm_native.c 2007-09-26 13:54:57.000000000 -0700
+++ linux-2.6.23-rc8-qos-nolatency.c/sound/core/pcm_native.c 2007-09-26 14:50:57.000000000 -0700
@@ -24,7 +24,7 @@
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/time.h>
-#include <linux/latency.h>
+#include <linux/qos_params.h>
#include <linux/uio.h>
#include <sound/core.h>
#include <sound/control.h>
@@ -447,9 +447,9 @@
snd_pcm_timer_resolution_change(substream);
runtime->status->state = SNDRV_PCM_STATE_SETUP;
- remove_acceptable_latency(substream->latency_id);
+ qos_remove_requirement(QOS_CPU_DMA_LATENCY, substream->latency_id);
if ((usecs = period_to_usecs(runtime)) >= 0)
- set_acceptable_latency(substream->latency_id, usecs);
+ qos_add_requirement(QOS_CPU_DMA_LATENCY, substream->latency_id, usecs);
return 0;
_error:
/* hardware might be unuseable from this time,
@@ -509,7 +509,7 @@
if (substream->ops->hw_free)
result = substream->ops->hw_free(substream);
runtime->status->state = SNDRV_PCM_STATE_OPEN;
- remove_acceptable_latency(substream->latency_id);
+ qos_remove_requirement(QOS_CPU_DMA_LATENCY, substream->latency_id);
return result;
}
-
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