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PM QOS update
This patch changes the string based list management to a handle base implementation to help with the hot path use of pm-qos, it also renames much of the API to use "request" as opposed to "requirement" that was used in the initial implementation. I did this because request more accurately represents what it actually does. Also, I added a string based ABI for users wanting to use a string interface. So if the user writes 0xDDDDDDDD formatted hex it will be accepted by the interface. (someone asked me for it and I don't think it hurts anything.) This patch updates some documentation input I got from Randy. Signed-off-by: markgross <mgross@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
parent
0fef8b1e83
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ed77134bfc
@ -18,44 +18,46 @@ and pm_qos_params.h. This is done because having the available parameters
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being runtime configurable or changeable from a driver was seen as too easy to
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abuse.
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For each parameter a list of performance requirements is maintained along with
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For each parameter a list of performance requests is maintained along with
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an aggregated target value. The aggregated target value is updated with
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changes to the requirement list or elements of the list. Typically the
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aggregated target value is simply the max or min of the requirement values held
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changes to the request list or elements of the list. Typically the
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aggregated target value is simply the max or min of the request values held
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in the parameter list elements.
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From kernel mode the use of this interface is simple:
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pm_qos_add_requirement(param_id, name, target_value):
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Will insert a named element in the list for that identified PM_QOS parameter
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with the target value. Upon change to this list the new target is recomputed
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and any registered notifiers are called only if the target value is now
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different.
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pm_qos_update_requirement(param_id, name, new_target_value):
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Will search the list identified by the param_id for the named list element and
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then update its target value, calling the notification tree if the aggregated
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target is changed. with that name is already registered.
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handle = pm_qos_add_request(param_class, target_value):
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Will insert an element into the list for that identified PM_QOS class with the
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target value. Upon change to this list the new target is recomputed and any
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registered notifiers are called only if the target value is now different.
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Clients of pm_qos need to save the returned handle.
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pm_qos_remove_requirement(param_id, name):
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Will search the identified list for the named element and remove it, after
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removal it will update the aggregate target and call the notification tree if
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the target was changed as a result of removing the named requirement.
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void pm_qos_update_request(handle, new_target_value):
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Will update the list element pointed to by the handle with the new target value
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and recompute the new aggregated target, calling the notification tree if the
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target is changed.
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void pm_qos_remove_request(handle):
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Will remove the element. After removal it will update the aggregate target and
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call the notification tree if the target was changed as a result of removing
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the request.
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From user mode:
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Only processes can register a pm_qos requirement. To provide for automatic
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cleanup for process the interface requires the process to register its
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parameter requirements in the following way:
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Only processes can register a pm_qos request. To provide for automatic
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cleanup of a process, the interface requires the process to register its
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parameter requests in the following way:
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To register the default pm_qos target for the specific parameter, the process
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must open one of /dev/[cpu_dma_latency, network_latency, network_throughput]
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As long as the device node is held open that process has a registered
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requirement on the parameter. The name of the requirement is "process_<PID>"
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derived from the current->pid from within the open system call.
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request on the parameter.
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To change the requested target value the process needs to write a s32 value to
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the open device node. This translates to a pm_qos_update_requirement call.
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To change the requested target value the process needs to write an s32 value to
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the open device node. Alternatively the user mode program could write a hex
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string for the value using 10 char long format e.g. "0x12345678". This
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translates to a pm_qos_update_request call.
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To remove the user mode request for a target value simply close the device
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node.
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@ -698,7 +698,7 @@ static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
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"max_cstate: C%d\n"
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"maximum allowed latency: %d usec\n",
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pr->power.state ? pr->power.state - pr->power.states : 0,
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max_cstate, pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY));
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max_cstate, pm_qos_request(PM_QOS_CPU_DMA_LATENCY));
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seq_puts(seq, "states:\n");
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@ -67,7 +67,7 @@ static int ladder_select_state(struct cpuidle_device *dev)
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struct ladder_device *ldev = &__get_cpu_var(ladder_devices);
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struct ladder_device_state *last_state;
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int last_residency, last_idx = ldev->last_state_idx;
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int latency_req = pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY);
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int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
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/* Special case when user has set very strict latency requirement */
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if (unlikely(latency_req == 0)) {
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@ -182,7 +182,7 @@ static u64 div_round64(u64 dividend, u32 divisor)
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static int menu_select(struct cpuidle_device *dev)
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{
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struct menu_device *data = &__get_cpu_var(menu_devices);
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int latency_req = pm_qos_requirement(PM_QOS_CPU_DMA_LATENCY);
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int latency_req = pm_qos_request(PM_QOS_CPU_DMA_LATENCY);
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int i;
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int multiplier;
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@ -2524,12 +2524,12 @@ static void e1000_configure_rx(struct e1000_adapter *adapter)
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* excessive C-state transition latencies result in
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* dropped transactions.
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*/
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pm_qos_update_requirement(PM_QOS_CPU_DMA_LATENCY,
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adapter->netdev->name, 55);
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pm_qos_update_request(
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adapter->netdev->pm_qos_req, 55);
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} else {
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pm_qos_update_requirement(PM_QOS_CPU_DMA_LATENCY,
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adapter->netdev->name,
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PM_QOS_DEFAULT_VALUE);
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pm_qos_update_request(
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adapter->netdev->pm_qos_req,
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PM_QOS_DEFAULT_VALUE);
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}
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}
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@ -2824,8 +2824,8 @@ int e1000e_up(struct e1000_adapter *adapter)
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/* DMA latency requirement to workaround early-receive/jumbo issue */
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if (adapter->flags & FLAG_HAS_ERT)
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pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
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adapter->netdev->name,
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adapter->netdev->pm_qos_req =
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pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
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PM_QOS_DEFAULT_VALUE);
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/* hardware has been reset, we need to reload some things */
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@ -2887,9 +2887,11 @@ void e1000e_down(struct e1000_adapter *adapter)
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e1000_clean_tx_ring(adapter);
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e1000_clean_rx_ring(adapter);
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if (adapter->flags & FLAG_HAS_ERT)
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pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
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adapter->netdev->name);
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if (adapter->flags & FLAG_HAS_ERT) {
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pm_qos_remove_request(
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adapter->netdev->pm_qos_req);
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adapter->netdev->pm_qos_req = NULL;
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}
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/*
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* TODO: for power management, we could drop the link and
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@ -48,6 +48,7 @@
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#define DRV_VERSION "1.0.0-k0"
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char igbvf_driver_name[] = "igbvf";
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const char igbvf_driver_version[] = DRV_VERSION;
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struct pm_qos_request_list *igbvf_driver_pm_qos_req;
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static const char igbvf_driver_string[] =
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"Intel(R) Virtual Function Network Driver";
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static const char igbvf_copyright[] = "Copyright (c) 2009 Intel Corporation.";
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@ -2899,7 +2900,7 @@ static int __init igbvf_init_module(void)
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printk(KERN_INFO "%s\n", igbvf_copyright);
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ret = pci_register_driver(&igbvf_driver);
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pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY, igbvf_driver_name,
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igbvf_driver_pm_qos_req = pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
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PM_QOS_DEFAULT_VALUE);
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return ret;
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@ -2915,7 +2916,8 @@ module_init(igbvf_init_module);
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static void __exit igbvf_exit_module(void)
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{
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pci_unregister_driver(&igbvf_driver);
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pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY, igbvf_driver_name);
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pm_qos_remove_request(igbvf_driver_pm_qos_req);
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igbvf_driver_pm_qos_req = NULL;
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}
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module_exit(igbvf_exit_module);
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@ -174,6 +174,8 @@ that only one external action is invoked at a time.
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#define DRV_DESCRIPTION "Intel(R) PRO/Wireless 2100 Network Driver"
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#define DRV_COPYRIGHT "Copyright(c) 2003-2006 Intel Corporation"
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struct pm_qos_request_list *ipw2100_pm_qos_req;
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/* Debugging stuff */
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#ifdef CONFIG_IPW2100_DEBUG
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#define IPW2100_RX_DEBUG /* Reception debugging */
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@ -1739,7 +1741,7 @@ static int ipw2100_up(struct ipw2100_priv *priv, int deferred)
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/* the ipw2100 hardware really doesn't want power management delays
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* longer than 175usec
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*/
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pm_qos_update_requirement(PM_QOS_CPU_DMA_LATENCY, "ipw2100", 175);
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pm_qos_update_request(ipw2100_pm_qos_req, 175);
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/* If the interrupt is enabled, turn it off... */
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spin_lock_irqsave(&priv->low_lock, flags);
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@ -1887,8 +1889,7 @@ static void ipw2100_down(struct ipw2100_priv *priv)
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ipw2100_disable_interrupts(priv);
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spin_unlock_irqrestore(&priv->low_lock, flags);
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pm_qos_update_requirement(PM_QOS_CPU_DMA_LATENCY, "ipw2100",
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PM_QOS_DEFAULT_VALUE);
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pm_qos_update_request(ipw2100_pm_qos_req, PM_QOS_DEFAULT_VALUE);
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/* We have to signal any supplicant if we are disassociating */
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if (associated)
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@ -6669,7 +6670,7 @@ static int __init ipw2100_init(void)
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if (ret)
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goto out;
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pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY, "ipw2100",
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ipw2100_pm_qos_req = pm_qos_add_request(PM_QOS_CPU_DMA_LATENCY,
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PM_QOS_DEFAULT_VALUE);
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#ifdef CONFIG_IPW2100_DEBUG
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ipw2100_debug_level = debug;
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@ -6692,7 +6693,7 @@ static void __exit ipw2100_exit(void)
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&driver_attr_debug_level);
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#endif
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pci_unregister_driver(&ipw2100_pci_driver);
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pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY, "ipw2100");
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pm_qos_remove_request(ipw2100_pm_qos_req);
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}
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module_init(ipw2100_init);
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@ -31,6 +31,7 @@
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#include <linux/if_link.h>
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#ifdef __KERNEL__
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#include <linux/pm_qos_params.h>
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#include <linux/timer.h>
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#include <linux/delay.h>
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#include <linux/mm.h>
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@ -711,6 +712,9 @@ struct net_device {
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* the interface.
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*/
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char name[IFNAMSIZ];
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struct pm_qos_request_list *pm_qos_req;
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/* device name hash chain */
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struct hlist_node name_hlist;
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/* snmp alias */
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@ -14,12 +14,14 @@
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#define PM_QOS_NUM_CLASSES 4
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#define PM_QOS_DEFAULT_VALUE -1
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int pm_qos_add_requirement(int qos, char *name, s32 value);
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int pm_qos_update_requirement(int qos, char *name, s32 new_value);
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void pm_qos_remove_requirement(int qos, char *name);
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struct pm_qos_request_list;
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int pm_qos_requirement(int qos);
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struct pm_qos_request_list *pm_qos_add_request(int pm_qos_class, s32 value);
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void pm_qos_update_request(struct pm_qos_request_list *pm_qos_req,
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s32 new_value);
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void pm_qos_remove_request(struct pm_qos_request_list *pm_qos_req);
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int pm_qos_add_notifier(int qos, struct notifier_block *notifier);
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int pm_qos_remove_notifier(int qos, struct notifier_block *notifier);
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int pm_qos_request(int pm_qos_class);
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int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier);
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int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier);
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@ -29,6 +29,7 @@
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#include <linux/poll.h>
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#include <linux/mm.h>
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#include <linux/bitops.h>
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#include <linux/pm_qos_params.h>
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#define snd_pcm_substream_chip(substream) ((substream)->private_data)
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#define snd_pcm_chip(pcm) ((pcm)->private_data)
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@ -365,7 +366,7 @@ struct snd_pcm_substream {
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int number;
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char name[32]; /* substream name */
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int stream; /* stream (direction) */
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char latency_id[20]; /* latency identifier */
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struct pm_qos_request_list *latency_pm_qos_req; /* pm_qos request */
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size_t buffer_bytes_max; /* limit ring buffer size */
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struct snd_dma_buffer dma_buffer;
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unsigned int dma_buf_id;
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@ -2,7 +2,7 @@
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* This module exposes the interface to kernel space for specifying
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* QoS dependencies. It provides infrastructure for registration of:
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*
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* Dependents on a QoS value : register requirements
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* Dependents on a QoS value : register requests
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* Watchers of QoS value : get notified when target QoS value changes
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*
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* This QoS design is best effort based. Dependents register their QoS needs.
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@ -14,19 +14,21 @@
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* timeout: usec <-- currently not used.
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* throughput: kbs (kilo byte / sec)
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*
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* There are lists of pm_qos_objects each one wrapping requirements, notifiers
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* There are lists of pm_qos_objects each one wrapping requests, notifiers
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*
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* User mode requirements on a QOS parameter register themselves to the
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* User mode requests on a QOS parameter register themselves to the
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* subsystem by opening the device node /dev/... and writing there request to
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* the node. As long as the process holds a file handle open to the node the
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* client continues to be accounted for. Upon file release the usermode
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* requirement is removed and a new qos target is computed. This way when the
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* requirement that the application has is cleaned up when closes the file
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* request is removed and a new qos target is computed. This way when the
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* request that the application has is cleaned up when closes the file
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* pointer or exits the pm_qos_object will get an opportunity to clean up.
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*
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* Mark Gross <mgross@linux.intel.com>
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*/
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/*#define DEBUG*/
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#include <linux/pm_qos_params.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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@ -42,25 +44,25 @@
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#include <linux/uaccess.h>
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/*
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* locking rule: all changes to requirements or notifiers lists
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* locking rule: all changes to requests or notifiers lists
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* or pm_qos_object list and pm_qos_objects need to happen with pm_qos_lock
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* held, taken with _irqsave. One lock to rule them all
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*/
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struct requirement_list {
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struct pm_qos_request_list {
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struct list_head list;
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union {
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s32 value;
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s32 usec;
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s32 kbps;
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};
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char *name;
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int pm_qos_class;
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};
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static s32 max_compare(s32 v1, s32 v2);
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static s32 min_compare(s32 v1, s32 v2);
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struct pm_qos_object {
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struct requirement_list requirements;
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struct pm_qos_request_list requests;
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struct blocking_notifier_head *notifiers;
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struct miscdevice pm_qos_power_miscdev;
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char *name;
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@ -72,7 +74,7 @@ struct pm_qos_object {
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static struct pm_qos_object null_pm_qos;
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static BLOCKING_NOTIFIER_HEAD(cpu_dma_lat_notifier);
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static struct pm_qos_object cpu_dma_pm_qos = {
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.requirements = {LIST_HEAD_INIT(cpu_dma_pm_qos.requirements.list)},
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.requests = {LIST_HEAD_INIT(cpu_dma_pm_qos.requests.list)},
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.notifiers = &cpu_dma_lat_notifier,
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.name = "cpu_dma_latency",
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.default_value = 2000 * USEC_PER_SEC,
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@ -82,7 +84,7 @@ static struct pm_qos_object cpu_dma_pm_qos = {
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static BLOCKING_NOTIFIER_HEAD(network_lat_notifier);
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static struct pm_qos_object network_lat_pm_qos = {
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.requirements = {LIST_HEAD_INIT(network_lat_pm_qos.requirements.list)},
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.requests = {LIST_HEAD_INIT(network_lat_pm_qos.requests.list)},
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.notifiers = &network_lat_notifier,
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.name = "network_latency",
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.default_value = 2000 * USEC_PER_SEC,
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@ -93,8 +95,7 @@ static struct pm_qos_object network_lat_pm_qos = {
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static BLOCKING_NOTIFIER_HEAD(network_throughput_notifier);
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static struct pm_qos_object network_throughput_pm_qos = {
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.requirements =
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{LIST_HEAD_INIT(network_throughput_pm_qos.requirements.list)},
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.requests = {LIST_HEAD_INIT(network_throughput_pm_qos.requests.list)},
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.notifiers = &network_throughput_notifier,
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.name = "network_throughput",
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.default_value = 0,
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@ -135,31 +136,34 @@ static s32 min_compare(s32 v1, s32 v2)
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}
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static void update_target(int target)
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static void update_target(int pm_qos_class)
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{
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s32 extreme_value;
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struct requirement_list *node;
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struct pm_qos_request_list *node;
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unsigned long flags;
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int call_notifier = 0;
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spin_lock_irqsave(&pm_qos_lock, flags);
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extreme_value = pm_qos_array[target]->default_value;
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extreme_value = pm_qos_array[pm_qos_class]->default_value;
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list_for_each_entry(node,
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&pm_qos_array[target]->requirements.list, list) {
|
||||
extreme_value = pm_qos_array[target]->comparitor(
|
||||
&pm_qos_array[pm_qos_class]->requests.list, list) {
|
||||
extreme_value = pm_qos_array[pm_qos_class]->comparitor(
|
||||
extreme_value, node->value);
|
||||
}
|
||||
if (atomic_read(&pm_qos_array[target]->target_value) != extreme_value) {
|
||||
if (atomic_read(&pm_qos_array[pm_qos_class]->target_value) !=
|
||||
extreme_value) {
|
||||
call_notifier = 1;
|
||||
atomic_set(&pm_qos_array[target]->target_value, extreme_value);
|
||||
pr_debug(KERN_ERR "new target for qos %d is %d\n", target,
|
||||
atomic_read(&pm_qos_array[target]->target_value));
|
||||
atomic_set(&pm_qos_array[pm_qos_class]->target_value,
|
||||
extreme_value);
|
||||
pr_debug(KERN_ERR "new target for qos %d is %d\n", pm_qos_class,
|
||||
atomic_read(&pm_qos_array[pm_qos_class]->target_value));
|
||||
}
|
||||
spin_unlock_irqrestore(&pm_qos_lock, flags);
|
||||
|
||||
if (call_notifier)
|
||||
blocking_notifier_call_chain(pm_qos_array[target]->notifiers,
|
||||
(unsigned long) extreme_value, NULL);
|
||||
blocking_notifier_call_chain(
|
||||
pm_qos_array[pm_qos_class]->notifiers,
|
||||
(unsigned long) extreme_value, NULL);
|
||||
}
|
||||
|
||||
static int register_pm_qos_misc(struct pm_qos_object *qos)
|
||||
@ -185,125 +189,110 @@ static int find_pm_qos_object_by_minor(int minor)
|
||||
}
|
||||
|
||||
/**
|
||||
* pm_qos_requirement - returns current system wide qos expectation
|
||||
* pm_qos_request - returns current system wide qos expectation
|
||||
* @pm_qos_class: identification of which qos value is requested
|
||||
*
|
||||
* This function returns the current target value in an atomic manner.
|
||||
*/
|
||||
int pm_qos_requirement(int pm_qos_class)
|
||||
int pm_qos_request(int pm_qos_class)
|
||||
{
|
||||
return atomic_read(&pm_qos_array[pm_qos_class]->target_value);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_requirement);
|
||||
EXPORT_SYMBOL_GPL(pm_qos_request);
|
||||
|
||||
/**
|
||||
* pm_qos_add_requirement - inserts new qos request into the list
|
||||
* pm_qos_add_request - inserts new qos request into the list
|
||||
* @pm_qos_class: identifies which list of qos request to us
|
||||
* @name: identifies the request
|
||||
* @value: defines the qos request
|
||||
*
|
||||
* This function inserts a new entry in the pm_qos_class list of requested qos
|
||||
* performance characteristics. It recomputes the aggregate QoS expectations
|
||||
* for the pm_qos_class of parameters.
|
||||
* for the pm_qos_class of parameters, and returns the pm_qos_request list
|
||||
* element as a handle for use in updating and removal. Call needs to save
|
||||
* this handle for later use.
|
||||
*/
|
||||
int pm_qos_add_requirement(int pm_qos_class, char *name, s32 value)
|
||||
struct pm_qos_request_list *pm_qos_add_request(int pm_qos_class, s32 value)
|
||||
{
|
||||
struct requirement_list *dep;
|
||||
struct pm_qos_request_list *dep;
|
||||
unsigned long flags;
|
||||
|
||||
dep = kzalloc(sizeof(struct requirement_list), GFP_KERNEL);
|
||||
dep = kzalloc(sizeof(struct pm_qos_request_list), GFP_KERNEL);
|
||||
if (dep) {
|
||||
if (value == PM_QOS_DEFAULT_VALUE)
|
||||
dep->value = pm_qos_array[pm_qos_class]->default_value;
|
||||
else
|
||||
dep->value = value;
|
||||
dep->name = kstrdup(name, GFP_KERNEL);
|
||||
if (!dep->name)
|
||||
goto cleanup;
|
||||
dep->pm_qos_class = pm_qos_class;
|
||||
|
||||
spin_lock_irqsave(&pm_qos_lock, flags);
|
||||
list_add(&dep->list,
|
||||
&pm_qos_array[pm_qos_class]->requirements.list);
|
||||
&pm_qos_array[pm_qos_class]->requests.list);
|
||||
spin_unlock_irqrestore(&pm_qos_lock, flags);
|
||||
update_target(pm_qos_class);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
cleanup:
|
||||
kfree(dep);
|
||||
return -ENOMEM;
|
||||
return dep;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_add_requirement);
|
||||
EXPORT_SYMBOL_GPL(pm_qos_add_request);
|
||||
|
||||
/**
|
||||
* pm_qos_update_requirement - modifies an existing qos request
|
||||
* @pm_qos_class: identifies which list of qos request to us
|
||||
* @name: identifies the request
|
||||
* pm_qos_update_request - modifies an existing qos request
|
||||
* @pm_qos_req : handle to list element holding a pm_qos request to use
|
||||
* @value: defines the qos request
|
||||
*
|
||||
* Updates an existing qos requirement for the pm_qos_class of parameters along
|
||||
* Updates an existing qos request for the pm_qos_class of parameters along
|
||||
* with updating the target pm_qos_class value.
|
||||
*
|
||||
* If the named request isn't in the list then no change is made.
|
||||
* Attempts are made to make this code callable on hot code paths.
|
||||
*/
|
||||
int pm_qos_update_requirement(int pm_qos_class, char *name, s32 new_value)
|
||||
void pm_qos_update_request(struct pm_qos_request_list *pm_qos_req,
|
||||
s32 new_value)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct requirement_list *node;
|
||||
int pending_update = 0;
|
||||
s32 temp;
|
||||
|
||||
spin_lock_irqsave(&pm_qos_lock, flags);
|
||||
list_for_each_entry(node,
|
||||
&pm_qos_array[pm_qos_class]->requirements.list, list) {
|
||||
if (strcmp(node->name, name) == 0) {
|
||||
if (new_value == PM_QOS_DEFAULT_VALUE)
|
||||
node->value =
|
||||
pm_qos_array[pm_qos_class]->default_value;
|
||||
else
|
||||
node->value = new_value;
|
||||
pending_update = 1;
|
||||
break;
|
||||
}
|
||||
if (new_value == PM_QOS_DEFAULT_VALUE)
|
||||
temp = pm_qos_array[pm_qos_req->pm_qos_class]->default_value;
|
||||
else
|
||||
temp = new_value;
|
||||
|
||||
if (temp != pm_qos_req->value) {
|
||||
pending_update = 1;
|
||||
pm_qos_req->value = temp;
|
||||
}
|
||||
spin_unlock_irqrestore(&pm_qos_lock, flags);
|
||||
if (pending_update)
|
||||
update_target(pm_qos_class);
|
||||
|
||||
return 0;
|
||||
update_target(pm_qos_req->pm_qos_class);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_update_requirement);
|
||||
EXPORT_SYMBOL_GPL(pm_qos_update_request);
|
||||
|
||||
/**
|
||||
* pm_qos_remove_requirement - modifies an existing qos request
|
||||
* @pm_qos_class: identifies which list of qos request to us
|
||||
* @name: identifies the request
|
||||
* pm_qos_remove_request - modifies an existing qos request
|
||||
* @pm_qos_req: handle to request list element
|
||||
*
|
||||
* Will remove named qos request from pm_qos_class list of parameters and
|
||||
* recompute the current target value for the pm_qos_class.
|
||||
* Will remove pm qos request from the list of requests and
|
||||
* recompute the current target value for the pm_qos_class. Call this
|
||||
* on slow code paths.
|
||||
*/
|
||||
void pm_qos_remove_requirement(int pm_qos_class, char *name)
|
||||
void pm_qos_remove_request(struct pm_qos_request_list *pm_qos_req)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct requirement_list *node;
|
||||
int pending_update = 0;
|
||||
int qos_class;
|
||||
|
||||
if (pm_qos_req == NULL)
|
||||
return;
|
||||
/* silent return to keep pcm code cleaner */
|
||||
|
||||
qos_class = pm_qos_req->pm_qos_class;
|
||||
spin_lock_irqsave(&pm_qos_lock, flags);
|
||||
list_for_each_entry(node,
|
||||
&pm_qos_array[pm_qos_class]->requirements.list, list) {
|
||||
if (strcmp(node->name, name) == 0) {
|
||||
kfree(node->name);
|
||||
list_del(&node->list);
|
||||
kfree(node);
|
||||
pending_update = 1;
|
||||
break;
|
||||
}
|
||||
}
|
||||
list_del(&pm_qos_req->list);
|
||||
kfree(pm_qos_req);
|
||||
spin_unlock_irqrestore(&pm_qos_lock, flags);
|
||||
if (pending_update)
|
||||
update_target(pm_qos_class);
|
||||
update_target(qos_class);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_remove_requirement);
|
||||
EXPORT_SYMBOL_GPL(pm_qos_remove_request);
|
||||
|
||||
/**
|
||||
* pm_qos_add_notifier - sets notification entry for changes to target value
|
||||
@ -313,7 +302,7 @@ EXPORT_SYMBOL_GPL(pm_qos_remove_requirement);
|
||||
* will register the notifier into a notification chain that gets called
|
||||
* upon changes to the pm_qos_class target value.
|
||||
*/
|
||||
int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier)
|
||||
int pm_qos_add_notifier(int pm_qos_class, struct notifier_block *notifier)
|
||||
{
|
||||
int retval;
|
||||
|
||||
@ -343,21 +332,16 @@ int pm_qos_remove_notifier(int pm_qos_class, struct notifier_block *notifier)
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(pm_qos_remove_notifier);
|
||||
|
||||
#define PID_NAME_LEN 32
|
||||
|
||||
static int pm_qos_power_open(struct inode *inode, struct file *filp)
|
||||
{
|
||||
int ret;
|
||||
long pm_qos_class;
|
||||
char name[PID_NAME_LEN];
|
||||
|
||||
pm_qos_class = find_pm_qos_object_by_minor(iminor(inode));
|
||||
if (pm_qos_class >= 0) {
|
||||
filp->private_data = (void *)pm_qos_class;
|
||||
snprintf(name, PID_NAME_LEN, "process_%d", current->pid);
|
||||
ret = pm_qos_add_requirement(pm_qos_class, name,
|
||||
PM_QOS_DEFAULT_VALUE);
|
||||
if (ret >= 0)
|
||||
filp->private_data = (void *) pm_qos_add_request(pm_qos_class,
|
||||
PM_QOS_DEFAULT_VALUE);
|
||||
|
||||
if (filp->private_data)
|
||||
return 0;
|
||||
}
|
||||
return -EPERM;
|
||||
@ -365,32 +349,40 @@ static int pm_qos_power_open(struct inode *inode, struct file *filp)
|
||||
|
||||
static int pm_qos_power_release(struct inode *inode, struct file *filp)
|
||||
{
|
||||
int pm_qos_class;
|
||||
char name[PID_NAME_LEN];
|
||||
struct pm_qos_request_list *req;
|
||||
|
||||
pm_qos_class = (long)filp->private_data;
|
||||
snprintf(name, PID_NAME_LEN, "process_%d", current->pid);
|
||||
pm_qos_remove_requirement(pm_qos_class, name);
|
||||
req = (struct pm_qos_request_list *)filp->private_data;
|
||||
pm_qos_remove_request(req);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
|
||||
size_t count, loff_t *f_pos)
|
||||
{
|
||||
s32 value;
|
||||
int pm_qos_class;
|
||||
char name[PID_NAME_LEN];
|
||||
int x;
|
||||
char ascii_value[11];
|
||||
struct pm_qos_request_list *pm_qos_req;
|
||||
|
||||
pm_qos_class = (long)filp->private_data;
|
||||
if (count != sizeof(s32))
|
||||
if (count == sizeof(s32)) {
|
||||
if (copy_from_user(&value, buf, sizeof(s32)))
|
||||
return -EFAULT;
|
||||
} else if (count == 11) { /* len('0x12345678/0') */
|
||||
if (copy_from_user(ascii_value, buf, 11))
|
||||
return -EFAULT;
|
||||
x = sscanf(ascii_value, "%x", &value);
|
||||
if (x != 1)
|
||||
return -EINVAL;
|
||||
pr_debug(KERN_ERR "%s, %d, 0x%x\n", ascii_value, x, value);
|
||||
} else
|
||||
return -EINVAL;
|
||||
if (copy_from_user(&value, buf, sizeof(s32)))
|
||||
return -EFAULT;
|
||||
snprintf(name, PID_NAME_LEN, "process_%d", current->pid);
|
||||
pm_qos_update_requirement(pm_qos_class, name, value);
|
||||
|
||||
return sizeof(s32);
|
||||
pm_qos_req = (struct pm_qos_request_list *)filp->private_data;
|
||||
pm_qos_update_request(pm_qos_req, value);
|
||||
|
||||
return count;
|
||||
}
|
||||
|
||||
|
||||
|
@ -495,7 +495,7 @@ void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
|
||||
s32 beaconint_us;
|
||||
|
||||
if (latency < 0)
|
||||
latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
|
||||
latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
|
||||
|
||||
beaconint_us = ieee80211_tu_to_usec(
|
||||
found->vif.bss_conf.beacon_int);
|
||||
|
@ -648,9 +648,6 @@ int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
|
||||
substream->number = idx;
|
||||
substream->stream = stream;
|
||||
sprintf(substream->name, "subdevice #%i", idx);
|
||||
snprintf(substream->latency_id, sizeof(substream->latency_id),
|
||||
"ALSA-PCM%d-%d%c%d", pcm->card->number, pcm->device,
|
||||
(stream ? 'c' : 'p'), idx);
|
||||
substream->buffer_bytes_max = UINT_MAX;
|
||||
if (prev == NULL)
|
||||
pstr->substream = substream;
|
||||
|
@ -481,11 +481,13 @@ static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
|
||||
snd_pcm_timer_resolution_change(substream);
|
||||
runtime->status->state = SNDRV_PCM_STATE_SETUP;
|
||||
|
||||
pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
|
||||
substream->latency_id);
|
||||
if (substream->latency_pm_qos_req) {
|
||||
pm_qos_remove_request(substream->latency_pm_qos_req);
|
||||
substream->latency_pm_qos_req = NULL;
|
||||
}
|
||||
if ((usecs = period_to_usecs(runtime)) >= 0)
|
||||
pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
|
||||
substream->latency_id, usecs);
|
||||
substream->latency_pm_qos_req = pm_qos_add_request(
|
||||
PM_QOS_CPU_DMA_LATENCY, usecs);
|
||||
return 0;
|
||||
_error:
|
||||
/* hardware might be unuseable from this time,
|
||||
@ -540,8 +542,8 @@ static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
|
||||
if (substream->ops->hw_free)
|
||||
result = substream->ops->hw_free(substream);
|
||||
runtime->status->state = SNDRV_PCM_STATE_OPEN;
|
||||
pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
|
||||
substream->latency_id);
|
||||
pm_qos_remove_request(substream->latency_pm_qos_req);
|
||||
substream->latency_pm_qos_req = NULL;
|
||||
return result;
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user