litmus-rt.git - The LITMUS^RT kernel.

diff options

author	Linus Torvalds <torvalds@linux-foundation.org>	2009-11-02 12:53:19 -0500
committer	Linus Torvalds <torvalds@linux-foundation.org>	2009-11-02 12:53:19 -0500
commit	c35102c3e15f90fe604523a2fbffd9dc158b455a (patch)
tree	0c248939a1f424701b583873360c91e081bfe810 /net/tipc/msg.c
parent	20107f84b29536887b958e38b20474cccc619322 (diff)
parent	4b46d6416548fb6a0940dfd9911fd895eb6247b3 (diff)

Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm

* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: ARM: ensure initial page tables are setup for SMP systems ARM: 5776/1: Check compiler version and EABI support when adding ARM unwind support. ARM: 5774/1: Fix Realview ARM1176PB board reboot ARM: Fix errata 411920 workarounds ARM: Fix sparsemem with SPARSEMEM_EXTREME enabled ARM: Use GFP_DMA only for masks _less_ than 32-bit ARM: integrator: allow Integrator to be built with highmem ARM: Fix signal restart issues with NX and OABI compat

Diffstat (limited to 'net/tipc/msg.c')

0 files changed, 0 insertions, 0 deletions

/* * drivers/base/power/domain_governor.c - Governors for device PM domains. * * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. * * This file is released under the GPLv2. */ #include <linux/kernel.h> #include <linux/pm_domain.h> #include <linux/pm_qos.h> #include <linux/hrtimer.h> static int dev_update_qos_constraint(struct device *dev, void *data) { s64 *constraint_ns_p = data; s64 constraint_ns; if (dev->power.subsys_data && dev->power.subsys_data->domain_data) { /* * Only take suspend-time QoS constraints of devices into * account, because constraints updated after the device has * been suspended are not guaranteed to be taken into account * anyway. In order for them to take effect, the device has to * be resumed and suspended again. */ constraint_ns = dev_gpd_data(dev)->td.effective_constraint_ns; } else { /* * The child is not in a domain and there's no info on its * suspend/resume latencies, so assume them to be negligible and * take its current PM QoS constraint (that's the only thing * known at this point anyway). */ constraint_ns = dev_pm_qos_read_value(dev); constraint_ns *= NSEC_PER_USEC; } if (constraint_ns < *constraint_ns_p) *constraint_ns_p = constraint_ns; return 0; } /** * default_suspend_ok - Default PM domain governor routine to suspend devices. * @dev: Device to check. */ static bool default_suspend_ok(struct device *dev) { struct gpd_timing_data *td = &dev_gpd_data(dev)->td; unsigned long flags; s64 constraint_ns; dev_dbg(dev, "%s()\n", __func__); spin_lock_irqsave(&dev->power.lock, flags); if (!td->constraint_changed) { bool ret = td->cached_suspend_ok; spin_unlock_irqrestore(&dev->power.lock, flags); return ret; } td->constraint_changed = false; td->cached_suspend_ok = false; td->effective_constraint_ns = 0; constraint_ns = __dev_pm_qos_read_value(dev); spin_unlock_irqrestore(&dev->power.lock, flags); if (constraint_ns == 0) return false; constraint_ns *= NSEC_PER_USEC; /* * We can walk the children without any additional locking, because * they all have been suspended at this point and their * effective_constraint_ns fields won't be modified in parallel with us. */ if (!dev->power.ignore_children) device_for_each_child(dev, &constraint_ns, dev_update_qos_constraint); if (constraint_ns == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS) { /* "No restriction", so the device is allowed to suspend. */ td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; td->cached_suspend_ok = true; } else if (constraint_ns == 0) { /* * This triggers if one of the children that don't belong to a * domain has a zero PM QoS constraint and it's better not to * suspend then. effective_constraint_ns is zero already and * cached_suspend_ok is false, so bail out. */ return false; } else { constraint_ns -= td->suspend_latency_ns + td->resume_latency_ns; /* * effective_constraint_ns is zero already and cached_suspend_ok * is false, so if the computed value is not positive, return * right away. */ if (constraint_ns <= 0) return false; td->effective_constraint_ns = constraint_ns; td->cached_suspend_ok = true; } /* * The children have been suspended already, so we don't need to take * their suspend latencies into account here. */ return td->cached_suspend_ok; } static bool __default_power_down_ok(struct dev_pm_domain *pd, unsigned int state) { struct generic_pm_domain *genpd = pd_to_genpd(pd); struct gpd_link *link; struct pm_domain_data *pdd; s64 min_off_time_ns; s64 off_on_time_ns; off_on_time_ns = genpd->states[state].power_off_latency_ns + genpd->states[state].power_on_latency_ns; min_off_time_ns = -1; /* * Check if subdomains can be off for enough time. * * All subdomains have been powered off already at this point. */ list_for_each_entry(link, &genpd->master_links, master_node) { struct generic_pm_domain *sd = link->slave; s64 sd_max_off_ns = sd->max_off_time_ns; if (sd_max_off_ns < 0) continue; /* * Check if the subdomain is allowed to be off long enough for * the current domain to turn off and on (that's how much time * it will have to wait worst case). */ if (sd_max_off_ns <= off_on_time_ns) return false; if (min_off_time_ns > sd_max_off_ns || min_off_time_ns < 0) min_off_time_ns = sd_max_off_ns; } /* * Check if the devices in the domain can be off enough time. */ list_for_each_entry(pdd, &genpd->dev_list, list_node) { struct gpd_timing_data *td; s64 constraint_ns; /* * Check if the device is allowed to be off long enough for the * domain to turn off and on (that's how much time it will * have to wait worst case). */ td = &to_gpd_data(pdd)->td; constraint_ns = td->effective_constraint_ns; /* * Zero means "no suspend at all" and this runs only when all * devices in the domain are suspended, so it must be positive. */ if (constraint_ns == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS) continue; if (constraint_ns <= off_on_time_ns) return false; if (min_off_time_ns > constraint_ns || min_off_time_ns < 0) min_off_time_ns = constraint_ns; } /* * If the computed minimum device off time is negative, there are no * latency constraints, so the domain can spend arbitrary time in the * "off" state. */ if (min_off_time_ns < 0) return true; /* * The difference between the computed minimum subdomain or device off * time and the time needed to turn the domain on is the maximum * theoretical time this domain can spend in the "off" state. */ genpd->max_off_time_ns = min_off_time_ns - genpd->states[state].power_on_latency_ns; return true; } /** * default_power_down_ok - Default generic PM domain power off governor routine. * @pd: PM domain to check. * * This routine must be executed under the PM domain's lock. */ static bool default_power_down_ok(struct dev_pm_domain *pd) { struct generic_pm_domain *genpd = pd_to_genpd(pd); struct gpd_link *link; if (!genpd->max_off_time_changed) return genpd->cached_power_down_ok; /* * We have to invalidate the cached results for the masters, so * use the observation that default_power_down_ok() is not * going to be called for any master until this instance * returns. */ list_for_each_entry(link, &genpd->slave_links, slave_node) link->master->max_off_time_changed = true; genpd->max_off_time_ns = -1; genpd->max_off_time_changed = false; genpd->cached_power_down_ok = true; genpd->state_idx = genpd->state_count - 1; /* Find a state to power down to, starting from the deepest. */ while (!__default_power_down_ok(pd, genpd->state_idx)) { if (genpd->state_idx == 0) { genpd->cached_power_down_ok = false; break; } genpd->state_idx--; } return genpd->cached_power_down_ok; } static bool always_on_power_down_ok(struct dev_pm_domain *domain) { return false; } struct dev_power_governor simple_qos_governor = { .suspend_ok = default_suspend_ok, .power_down_ok = default_power_down_ok, }; /** * pm_genpd_gov_always_on - A governor implementing an always-on policy */ struct dev_power_governor pm_domain_always_on_gov = { .power_down_ok = always_on_power_down_ok, .suspend_ok = default_suspend_ok, };


context:
space:
mode: