tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge branch 'pm-qos'
* pm-qos:
PM / QoS: Add PM_QOS_MEMORY_BANDWIDTH class
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Documentation/power/pm_qos_interface.txt
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Documentation/power/pm_qos_interface.txt
···
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one of the parameters.
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Two different PM QoS frameworks are available:
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1. PM QoS classes for cpu_dma_latency, network_latency, network_throughput.
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1. PM QoS classes for cpu_dma_latency, network_latency, network_throughput,
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memory_bandwidth.
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2. the per-device PM QoS framework provides the API to manage the per-device latency
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constraints and PM QoS flags.
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···
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* latency: usec
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* timeout: usec
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* throughput: kbs (kilo bit / sec)
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* memory bandwidth: mbs (mega bit / sec)
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1. PM QoS framework
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include/linux/pm_qos.h
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include/linux/pm_qos.h
···
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PM_QOS_CPU_DMA_LATENCY,
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PM_QOS_NETWORK_LATENCY,
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PM_QOS_NETWORK_THROUGHPUT,
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PM_QOS_MEMORY_BANDWIDTH,
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/* insert new class ID */
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PM_QOS_NUM_CLASSES,
···
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#define PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
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#define PM_QOS_NETWORK_LAT_DEFAULT_VALUE (2000 * USEC_PER_SEC)
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#define PM_QOS_NETWORK_THROUGHPUT_DEFAULT_VALUE 0
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#define PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE 0
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#define PM_QOS_RESUME_LATENCY_DEFAULT_VALUE 0
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#define PM_QOS_LATENCY_TOLERANCE_DEFAULT_VALUE 0
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#define PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT (-1)
···
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enum pm_qos_type {
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PM_QOS_UNITIALIZED,
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PM_QOS_MAX, /* return the largest value */
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PM_QOS_MIN /* return the smallest value */
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PM_QOS_MIN, /* return the smallest value */
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PM_QOS_SUM /* return the sum */
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};
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/*
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kernel/power/qos.c
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kernel/power/qos.c
···
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};
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static BLOCKING_NOTIFIER_HEAD(memory_bandwidth_notifier);
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static struct pm_qos_constraints memory_bw_constraints = {
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.list = PLIST_HEAD_INIT(memory_bw_constraints.list),
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.target_value = PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE,
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.default_value = PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE,
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.no_constraint_value = PM_QOS_MEMORY_BANDWIDTH_DEFAULT_VALUE,
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.type = PM_QOS_SUM,
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.notifiers = &memory_bandwidth_notifier,
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};
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static struct pm_qos_object memory_bandwidth_pm_qos = {
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.constraints = &memory_bw_constraints,
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.name = "memory_bandwidth",
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};
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static struct pm_qos_object *pm_qos_array[] = {
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&null_pm_qos,
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&cpu_dma_pm_qos,
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&network_lat_pm_qos,
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&network_throughput_pm_qos
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&network_throughput_pm_qos,
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&memory_bandwidth_pm_qos,
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};
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static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
···
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/* unlocked internal variant */
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static inline int pm_qos_get_value(struct pm_qos_constraints *c)
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{
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struct plist_node *node;
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int total_value = 0;
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if (plist_head_empty(&c->list))
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return c->no_constraint_value;
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···
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case PM_QOS_MAX:
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return plist_last(&c->list)->prio;
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case PM_QOS_SUM:
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plist_for_each(node, &c->list)
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total_value += node->prio;
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return total_value;
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default:
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/* runtime check for not using enum */