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Subject[RFT][PATCH 1/3] PM: QoS: Introduce frequency QoS
Date
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Introduce frequency QoS, based on the "raw" low-level PM QoS, to
represent min and max frequency requests and aggregate constraints.

The min and max frequency requests are to be represented by
struct freq_qos_request objects and the aggregate constraints are to
be represented by struct freq_constraints objects. The latter are
expected to be initialized with the help of freq_constraints_init().

The freq_qos_read_value() helper is defined to retrieve the aggregate
constraints values from a given struct freq_constraints object and
there are the freq_qos_add_request(), freq_qos_update_request() and
freq_qos_remove_request() helpers to manipulate the min and max
frequency requests. It is assumed that the the helpers will not
run concurrently with each other for the same struct freq_qos_request
object, so if that may be the case, their uses must ensure proper
synchronization between them (e.g. through locking).

In addition, freq_qos_add_notifier() and freq_qos_remove_notifier()
are provided to add and remove notifiers that will trigger on aggregate
constraint changes to and from a given struct freq_constraints object,
respectively.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
include/linux/pm_qos.h | 44 ++++++++
kernel/power/qos.c | 240 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 284 insertions(+)

Index: linux-pm/include/linux/pm_qos.h
===================================================================
--- linux-pm.orig/include/linux/pm_qos.h
+++ linux-pm/include/linux/pm_qos.h
@@ -267,4 +267,48 @@ static inline s32 dev_pm_qos_raw_resume_
}
#endif

+#define FREQ_QOS_MIN_DEFAULT_VALUE 0
+#define FREQ_QOS_MAX_DEFAULT_VALUE (-1)
+
+enum freq_qos_req_type {
+ FREQ_QOS_MIN = 1,
+ FREQ_QOS_MAX,
+};
+
+struct freq_constraints {
+ struct pm_qos_constraints min_freq;
+ struct blocking_notifier_head min_freq_notifiers;
+ struct pm_qos_constraints max_freq;
+ struct blocking_notifier_head max_freq_notifiers;
+};
+
+struct freq_qos_request {
+ enum freq_qos_req_type type;
+ struct plist_node pnode;
+ struct freq_constraints *qos;
+};
+
+static inline int freq_qos_request_active(struct freq_qos_request *req)
+{
+ return !IS_ERR_OR_NULL(req->qos);
+}
+
+void freq_constraints_init(struct freq_constraints *qos);
+
+s32 freq_qos_read_value(struct freq_constraints *qos,
+ enum freq_qos_req_type type);
+
+int freq_qos_add_request(struct freq_constraints *qos,
+ struct freq_qos_request *req,
+ enum freq_qos_req_type type, s32 value);
+int freq_qos_update_request(struct freq_qos_request *req, s32 new_value);
+int freq_qos_remove_request(struct freq_qos_request *req);
+
+int freq_qos_add_notifier(struct freq_constraints *qos,
+ enum freq_qos_req_type type,
+ struct notifier_block *notifier);
+int freq_qos_remove_notifier(struct freq_constraints *qos,
+ enum freq_qos_req_type type,
+ struct notifier_block *notifier);
+
#endif
Index: linux-pm/kernel/power/qos.c
===================================================================
--- linux-pm.orig/kernel/power/qos.c
+++ linux-pm/kernel/power/qos.c
@@ -650,3 +650,243 @@ static int __init pm_qos_power_init(void
}

late_initcall(pm_qos_power_init);
+
+/* Definitions related to the frequency QoS below. */
+
+/**
+ * freq_constraints_init - Initialize frequency QoS constraints.
+ * @qos: Frequency QoS constraints to initialize.
+ */
+void freq_constraints_init(struct freq_constraints *qos)
+{
+ struct pm_qos_constraints *c;
+
+ c = &qos->min_freq;
+ plist_head_init(&c->list);
+ c->target_value = FREQ_QOS_MIN_DEFAULT_VALUE;
+ c->default_value = FREQ_QOS_MIN_DEFAULT_VALUE;
+ c->no_constraint_value = FREQ_QOS_MIN_DEFAULT_VALUE;
+ c->type = PM_QOS_MAX;
+ c->notifiers = &qos->min_freq_notifiers;
+ BLOCKING_INIT_NOTIFIER_HEAD(c->notifiers);
+
+ c = &qos->max_freq;
+ plist_head_init(&c->list);
+ c->target_value = FREQ_QOS_MAX_DEFAULT_VALUE;
+ c->default_value = FREQ_QOS_MAX_DEFAULT_VALUE;
+ c->no_constraint_value = FREQ_QOS_MAX_DEFAULT_VALUE;
+ c->type = PM_QOS_MIN;
+ c->notifiers = &qos->max_freq_notifiers;
+ BLOCKING_INIT_NOTIFIER_HEAD(c->notifiers);
+}
+
+/**
+ * freq_qos_read_value - Get frequency QoS constraint for a given list.
+ * @qos: Constraints to evaluate.
+ * @type: QoS request type.
+ */
+s32 freq_qos_read_value(struct freq_constraints *qos,
+ enum freq_qos_req_type type)
+{
+ s32 ret;
+
+ switch (type) {
+ case FREQ_QOS_MIN:
+ ret = IS_ERR_OR_NULL(qos) ?
+ FREQ_QOS_MIN_DEFAULT_VALUE :
+ pm_qos_read_value(&qos->min_freq);
+ break;
+ case FREQ_QOS_MAX:
+ ret = IS_ERR_OR_NULL(qos) ?
+ FREQ_QOS_MAX_DEFAULT_VALUE :
+ pm_qos_read_value(&qos->max_freq);
+ break;
+ default:
+ WARN_ON(1);
+ ret = 0;
+ }
+
+ return ret;
+}
+
+/**
+ * freq_qos_apply - Add/modify/remove frequency QoS request.
+ * @req: Constraint request to apply.
+ * @action: Action to perform (add/update/remove).
+ * @value: Value to assign to the QoS request.
+ */
+static int freq_qos_apply(struct freq_qos_request *req,
+ enum pm_qos_req_action action, s32 value)
+{
+ int ret;
+
+ switch(req->type) {
+ case FREQ_QOS_MIN:
+ ret = pm_qos_update_target(&req->qos->min_freq, &req->pnode,
+ action, value);
+ break;
+ case FREQ_QOS_MAX:
+ ret = pm_qos_update_target(&req->qos->max_freq, &req->pnode,
+ action, value);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+/**
+ * freq_qos_add_request - Insert new frequency QoS request into a given list.
+ * @qos: Constraints to update.
+ * @req: Preallocated request object.
+ * @type: Request type.
+ * @value: Request value.
+ *
+ * Insert a new entry into the @qos list of requests, recompute the effective
+ * QoS constraint value for that list and initialize the @req object. The
+ * caller needs to save that object for later use in updates and removal.
+ *
+ * Return 1 if the effective constraint value has changed, 0 if the effective
+ * constraint value has not changed, or a negative error code on failures.
+ */
+int freq_qos_add_request(struct freq_constraints *qos,
+ struct freq_qos_request *req,
+ enum freq_qos_req_type type, s32 value)
+{
+ int ret;
+
+ if (IS_ERR_OR_NULL(qos) || !req)
+ return -EINVAL;
+
+ if (WARN(freq_qos_request_active(req),
+ "%s() called for active request\n", __func__))
+ return -EINVAL;
+
+ req->qos = qos;
+ req->type = type;
+ ret = freq_qos_apply(req, PM_QOS_ADD_REQ, value);
+ if (ret < 0) {
+ req->qos = NULL;
+ req->type = 0;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(freq_qos_add_request);
+
+/**
+ * freq_qos_update_request - Modify existing frequency QoS request.
+ * @req: Request to modify.
+ * @new_value: New request value.
+ *
+ * Update an existing frequency QoS request along with the effective constraint
+ * value for the list of requests it belongs to.
+ *
+ * Return 1 if the effective constraint value has changed, 0 if the effective
+ * constraint value has not changed, or a negative error code on failures.
+ */
+int freq_qos_update_request(struct freq_qos_request *req, s32 new_value)
+{
+ if (!req)
+ return -EINVAL;
+
+ if (WARN(!freq_qos_request_active(req),
+ "%s() called for unknown object\n", __func__))
+ return -EINVAL;
+
+ if (req->pnode.prio == new_value)
+ return 0;
+
+ return freq_qos_apply(req, PM_QOS_UPDATE_REQ, new_value);
+}
+EXPORT_SYMBOL_GPL(freq_qos_update_request);
+
+/**
+ * freq_qos_remove_request - Remove frequency QoS request from its list.
+ * @req: Request to remove.
+ *
+ * Remove the given frequency QoS request from the list of constraints it
+ * belongs to and recompute the effective constraint value for that list.
+ *
+ * Return 1 if the effective constraint value has changed, 0 if the effective
+ * constraint value has not changed, or a negative error code on failures.
+ */
+int freq_qos_remove_request(struct freq_qos_request *req)
+{
+ if (!req)
+ return -EINVAL;
+
+ if (WARN(!freq_qos_request_active(req),
+ "%s() called for unknown object\n", __func__))
+ return -EINVAL;
+
+ return freq_qos_apply(req, PM_QOS_REMOVE_REQ, PM_QOS_DEFAULT_VALUE);
+}
+EXPORT_SYMBOL_GPL(freq_qos_remove_request);
+
+/**
+ * freq_qos_add_notifier - Add frequency QoS change notifier.
+ * @qos: List of requests to add the notifier to.
+ * @type: Request type.
+ * @notifier: Notifier block to add.
+ */
+int freq_qos_add_notifier(struct freq_constraints *qos,
+ enum freq_qos_req_type type,
+ struct notifier_block *notifier)
+{
+ int ret;
+
+ if (IS_ERR_OR_NULL(qos) || !notifier)
+ return -EINVAL;
+
+ switch (type) {
+ case FREQ_QOS_MIN:
+ ret = blocking_notifier_chain_register(qos->min_freq.notifiers,
+ notifier);
+ break;
+ case FREQ_QOS_MAX:
+ ret = blocking_notifier_chain_register(qos->max_freq.notifiers,
+ notifier);
+ break;
+ default:
+ WARN_ON(1);
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(freq_qos_add_notifier);
+
+/**
+ * freq_qos_remove_notifier - Remove frequency QoS change notifier.
+ * @qos: List of requests to remove the notifier from.
+ * @type: Request type.
+ * @notifier: Notifier block to remove.
+ */
+int freq_qos_remove_notifier(struct freq_constraints *qos,
+ enum freq_qos_req_type type,
+ struct notifier_block *notifier)
+{
+ int ret;
+
+ if (IS_ERR_OR_NULL(qos) || !notifier)
+ return -EINVAL;
+
+ switch (type) {
+ case FREQ_QOS_MIN:
+ ret = blocking_notifier_chain_unregister(qos->min_freq.notifiers,
+ notifier);
+ break;
+ case FREQ_QOS_MAX:
+ ret = blocking_notifier_chain_unregister(qos->max_freq.notifiers,
+ notifier);
+ break;
+ default:
+ WARN_ON(1);
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(freq_qos_remove_notifier);


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