Commit 6f049e7c authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

Merge branch 'pm-opp' 

* pm-opp:
  PM / Domains: Propagate performance state updates
  PM / Domains: Factorize dev_pm_genpd_set_performance_state()
  PM / Domains: Save OPP table pointer in genpd
  OPP: Don't return 0 on error from of_get_required_opp_performance_state()
  OPP: Add dev_pm_opp_xlate_performance_state() helper
  OPP: Improve _find_table_of_opp_np()
  PM / Domains: Make genpd performance states orthogonal to the idlestates
  OPP: Fix missing debugfs supply directory for OPPs
  OPP: Use opp_table->regulators to verify no regulator case
  OPP: Remove of_dev_pm_opp_find_required_opp()
  OPP: Rename and relocate of_genpd_opp_to_performance_state()
  OPP: Configure all required OPPs
  OPP: Add dev_pm_opp_{set|put}_genpd_virt_dev() helper
  PM / Domains: Add genpd_opp_to_performance_state()
  OPP: Populate OPPs from "required-opps" property
  OPP: Populate required opp tables from "required-opps" property
  OPP: Separate out custom OPP handler specific code
  OPP: Identify and mark genpd OPP tables
  PM / Domains: Rename genpd virtual devices as virt_dev
parents 3a56fe68 bcbeef5f

drivers/base/power/domain.c

+175 −97
Original line number Diff line number Diff line
@@ -239,6 +239,127 @@ static void genpd_update_accounting(struct generic_pm_domain *genpd) 
static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {}

#endif



static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd,

					   unsigned int state)

{

	struct generic_pm_domain_data *pd_data;

	struct pm_domain_data *pdd;

	struct gpd_link *link;



	/* New requested state is same as Max requested state */

	if (state == genpd->performance_state)

		return state;



	/* New requested state is higher than Max requested state */

	if (state > genpd->performance_state)

		return state;



	/* Traverse all devices within the domain */

	list_for_each_entry(pdd, &genpd->dev_list, list_node) {

		pd_data = to_gpd_data(pdd);



		if (pd_data->performance_state > state)

			state = pd_data->performance_state;

	}



	/*

	 * Traverse all sub-domains within the domain. This can be

	 * done without any additional locking as the link->performance_state

	 * field is protected by the master genpd->lock, which is already taken.

	 *

	 * Also note that link->performance_state (subdomain's performance state

	 * requirement to master domain) is different from

	 * link->slave->performance_state (current performance state requirement

	 * of the devices/sub-domains of the subdomain) and so can have a

	 * different value.

	 *

	 * Note that we also take vote from powered-off sub-domains into account

	 * as the same is done for devices right now.

	 */

	list_for_each_entry(link, &genpd->master_links, master_node) {

		if (link->performance_state > state)

			state = link->performance_state;

	}



	return state;

}



static int _genpd_set_performance_state(struct generic_pm_domain *genpd,

					unsigned int state, int depth)

{

	struct generic_pm_domain *master;

	struct gpd_link *link;

	int master_state, ret;



	if (state == genpd->performance_state)

		return 0;



	/* Propagate to masters of genpd */

	list_for_each_entry(link, &genpd->slave_links, slave_node) {

		master = link->master;



		if (!master->set_performance_state)

			continue;



		/* Find master's performance state */

		ret = dev_pm_opp_xlate_performance_state(genpd->opp_table,

							 master->opp_table,

							 state);

		if (unlikely(ret < 0))

			goto err;



		master_state = ret;



		genpd_lock_nested(master, depth + 1);



		link->prev_performance_state = link->performance_state;

		link->performance_state = master_state;

		master_state = _genpd_reeval_performance_state(master,

						master_state);

		ret = _genpd_set_performance_state(master, master_state, depth + 1);

		if (ret)

			link->performance_state = link->prev_performance_state;



		genpd_unlock(master);



		if (ret)

			goto err;

	}



	ret = genpd->set_performance_state(genpd, state);

	if (ret)

		goto err;



	genpd->performance_state = state;

	return 0;



err:

	/* Encountered an error, lets rollback */

	list_for_each_entry_continue_reverse(link, &genpd->slave_links,

					     slave_node) {

		master = link->master;



		if (!master->set_performance_state)

			continue;



		genpd_lock_nested(master, depth + 1);



		master_state = link->prev_performance_state;

		link->performance_state = master_state;



		master_state = _genpd_reeval_performance_state(master,

						master_state);

		if (_genpd_set_performance_state(master, master_state, depth + 1)) {

			pr_err("%s: Failed to roll back to %d performance state\n",

			       master->name, master_state);

		}



		genpd_unlock(master);

	}



	return ret;

}



/**

 * dev_pm_genpd_set_performance_state- Set performance state of device's power

 * domain.
@@ -257,10 +378,9 @@ static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} 
int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)

{

	struct generic_pm_domain *genpd;

	struct generic_pm_domain_data *gpd_data, *pd_data;

	struct pm_domain_data *pdd;

	struct generic_pm_domain_data *gpd_data;

	unsigned int prev;

	int ret = 0;

	int ret;



	genpd = dev_to_genpd(dev);

	if (IS_ERR(genpd))
@@ -281,47 +401,11 @@ int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) 
	prev = gpd_data->performance_state;

	gpd_data->performance_state = state;



	/* New requested state is same as Max requested state */

	if (state == genpd->performance_state)

		goto unlock;



	/* New requested state is higher than Max requested state */

	if (state > genpd->performance_state)

		goto update_state;



	/* Traverse all devices within the domain */

	list_for_each_entry(pdd, &genpd->dev_list, list_node) {

		pd_data = to_gpd_data(pdd);



		if (pd_data->performance_state > state)

			state = pd_data->performance_state;

	}



	if (state == genpd->performance_state)

		goto unlock;



	/*

	 * We aren't propagating performance state changes of a subdomain to its

	 * masters as we don't have hardware that needs it. Over that, the

	 * performance states of subdomain and its masters may not have

	 * one-to-one mapping and would require additional information. We can

	 * get back to this once we have hardware that needs it. For that

	 * reason, we don't have to consider performance state of the subdomains

	 * of genpd here.

	 */



update_state:

	if (genpd_status_on(genpd)) {

		ret = genpd->set_performance_state(genpd, state);

		if (ret) {

	state = _genpd_reeval_performance_state(genpd, state);

	ret = _genpd_set_performance_state(genpd, state, 0);

	if (ret)

		gpd_data->performance_state = prev;

			goto unlock;

		}

	}



	genpd->performance_state = state;



unlock:

	genpd_unlock(genpd);



	return ret;
@@ -347,15 +431,6 @@ static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) 
		return ret;



	elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));



	if (unlikely(genpd->set_performance_state)) {

		ret = genpd->set_performance_state(genpd, genpd->performance_state);

		if (ret) {

			pr_warn("%s: Failed to set performance state %d (%d)\n",

				genpd->name, genpd->performance_state, ret);

		}

	}



	if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns)

		return ret;
@@ -1907,12 +1982,21 @@ int of_genpd_add_provider_simple(struct device_node *np, 
				ret);

			goto unlock;

		}



		/*

		 * Save table for faster processing while setting performance

		 * state.

		 */

		genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev);

		WARN_ON(!genpd->opp_table);

	}



	ret = genpd_add_provider(np, genpd_xlate_simple, genpd);

	if (ret) {

		if (genpd->set_performance_state)

		if (genpd->set_performance_state) {

			dev_pm_opp_put_opp_table(genpd->opp_table);

			dev_pm_opp_of_remove_table(&genpd->dev);

		}



		goto unlock;

	}
@@ -1965,6 +2049,13 @@ int of_genpd_add_provider_onecell(struct device_node *np, 
					i, ret);

				goto error;

			}



			/*

			 * Save table for faster processing while setting

			 * performance state.

			 */

			genpd->opp_table = dev_pm_opp_get_opp_table_indexed(&genpd->dev, i);

			WARN_ON(!genpd->opp_table);

		}



		genpd->provider = &np->fwnode;
@@ -1989,9 +2080,11 @@ error: 
		genpd->provider = NULL;

		genpd->has_provider = false;



		if (genpd->set_performance_state)

		if (genpd->set_performance_state) {

			dev_pm_opp_put_opp_table(genpd->opp_table);

			dev_pm_opp_of_remove_table(&genpd->dev);

		}

	}



	mutex_unlock(&gpd_list_lock);
@@ -2024,6 +2117,7 @@ void of_genpd_del_provider(struct device_node *np) 
					if (!gpd->set_performance_state)

						continue;



					dev_pm_opp_put_opp_table(gpd->opp_table);

					dev_pm_opp_of_remove_table(&gpd->dev);

				}

			}
@@ -2338,7 +2432,7 @@ EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); 
struct device *genpd_dev_pm_attach_by_id(struct device *dev,

					 unsigned int index)

{

	struct device *genpd_dev;

	struct device *virt_dev;

	int num_domains;

	int ret;
@@ -2352,31 +2446,31 @@ struct device *genpd_dev_pm_attach_by_id(struct device *dev, 
		return NULL;



	/* Allocate and register device on the genpd bus. */

	genpd_dev = kzalloc(sizeof(*genpd_dev), GFP_KERNEL);

	if (!genpd_dev)

	virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL);

	if (!virt_dev)

		return ERR_PTR(-ENOMEM);



	dev_set_name(genpd_dev, "genpd:%u:%s", index, dev_name(dev));

	genpd_dev->bus = &genpd_bus_type;

	genpd_dev->release = genpd_release_dev;

	dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev));

	virt_dev->bus = &genpd_bus_type;

	virt_dev->release = genpd_release_dev;



	ret = device_register(genpd_dev);

	ret = device_register(virt_dev);

	if (ret) {

		kfree(genpd_dev);

		kfree(virt_dev);

		return ERR_PTR(ret);

	}



	/* Try to attach the device to the PM domain at the specified index. */

	ret = __genpd_dev_pm_attach(genpd_dev, dev->of_node, index, false);

	ret = __genpd_dev_pm_attach(virt_dev, dev->of_node, index, false);

	if (ret < 1) {

		device_unregister(genpd_dev);

		device_unregister(virt_dev);

		return ret ? ERR_PTR(ret) : NULL;

	}



	pm_runtime_enable(genpd_dev);

	genpd_queue_power_off_work(dev_to_genpd(genpd_dev));

	pm_runtime_enable(virt_dev);

	genpd_queue_power_off_work(dev_to_genpd(virt_dev));



	return genpd_dev;

	return virt_dev;

}

EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id);
@@ -2521,52 +2615,36 @@ int of_genpd_parse_idle_states(struct device_node *dn, 
EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states);



/**

 * of_genpd_opp_to_performance_state- Gets performance state of device's

 * power domain corresponding to a DT node's "required-opps" property.

 * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node.

 *

 * @dev: Device for which the performance-state needs to be found.

 * @np: DT node where the "required-opps" property is present. This can be

 *	the device node itself (if it doesn't have an OPP table) or a node

 *	within the OPP table of a device (if device has an OPP table).

 * @genpd_dev: Genpd's device for which the performance-state needs to be found.

 * @opp: struct dev_pm_opp of the OPP for which we need to find performance

 *	state.

 *

 * Returns performance state corresponding to the "required-opps" property of

 * a DT node. This calls platform specific genpd->opp_to_performance_state()

 * callback to translate power domain OPP to performance state.

 * Returns performance state encoded in the OPP of the genpd. This calls

 * platform specific genpd->opp_to_performance_state() callback to translate

 * power domain OPP to performance state.

 *

 * Returns performance state on success and 0 on failure.

 */

unsigned int of_genpd_opp_to_performance_state(struct device *dev,

					       struct device_node *np)

unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev,

					       struct dev_pm_opp *opp)

{

	struct generic_pm_domain *genpd;

	struct dev_pm_opp *opp;

	int state = 0;

	struct generic_pm_domain *genpd = NULL;

	int state;



	genpd = dev_to_genpd(dev);

	if (IS_ERR(genpd))

		return 0;

	genpd = container_of(genpd_dev, struct generic_pm_domain, dev);



	if (unlikely(!genpd->set_performance_state))

	if (unlikely(!genpd->opp_to_performance_state))

		return 0;



	genpd_lock(genpd);



	opp = of_dev_pm_opp_find_required_opp(&genpd->dev, np);

	if (IS_ERR(opp)) {

		dev_err(dev, "Failed to find required OPP: %ld\n",

			PTR_ERR(opp));

		goto unlock;

	}



	state = genpd->opp_to_performance_state(genpd, opp);

	dev_pm_opp_put(opp);



unlock:

	genpd_unlock(genpd);



	return state;

}

EXPORT_SYMBOL_GPL(of_genpd_opp_to_performance_state);

EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state);



static int __init genpd_bus_init(void)

{

drivers/opp/core.c

+270 −77
Original line number Diff line number Diff line
@@ -196,12 +196,12 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) 
	if (IS_ERR(opp_table))

		return 0;



	count = opp_table->regulator_count;



	/* Regulator may not be required for the device */

	if (!count)

	if (!opp_table->regulators)

		goto put_opp_table;



	count = opp_table->regulator_count;



	uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL);

	if (!uV)

		goto put_opp_table;
@@ -548,44 +548,6 @@ _generic_set_opp_clk_only(struct device *dev, struct clk *clk, 
	return ret;

}



static inline int

_generic_set_opp_domain(struct device *dev, struct clk *clk,

			unsigned long old_freq, unsigned long freq,

			unsigned int old_pstate, unsigned int new_pstate)

{

	int ret;



	/* Scaling up? Scale domain performance state before frequency */

	if (freq > old_freq) {

		ret = dev_pm_genpd_set_performance_state(dev, new_pstate);

		if (ret)

			return ret;

	}



	ret = _generic_set_opp_clk_only(dev, clk, old_freq, freq);

	if (ret)

		goto restore_domain_state;



	/* Scaling down? Scale domain performance state after frequency */

	if (freq < old_freq) {

		ret = dev_pm_genpd_set_performance_state(dev, new_pstate);

		if (ret)

			goto restore_freq;

	}



	return 0;



restore_freq:

	if (_generic_set_opp_clk_only(dev, clk, freq, old_freq))

		dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n",

			__func__, old_freq);

restore_domain_state:

	if (freq > old_freq)

		dev_pm_genpd_set_performance_state(dev, old_pstate);



	return ret;

}



static int _generic_set_opp_regulator(const struct opp_table *opp_table,

				      struct device *dev,

				      unsigned long old_freq,
@@ -635,6 +597,84 @@ restore_voltage: 
	return ret;

}



static int _set_opp_custom(const struct opp_table *opp_table,

			   struct device *dev, unsigned long old_freq,

			   unsigned long freq,

			   struct dev_pm_opp_supply *old_supply,

			   struct dev_pm_opp_supply *new_supply)

{

	struct dev_pm_set_opp_data *data;

	int size;



	data = opp_table->set_opp_data;

	data->regulators = opp_table->regulators;

	data->regulator_count = opp_table->regulator_count;

	data->clk = opp_table->clk;

	data->dev = dev;



	data->old_opp.rate = old_freq;

	size = sizeof(*old_supply) * opp_table->regulator_count;

	if (IS_ERR(old_supply))

		memset(data->old_opp.supplies, 0, size);

	else

		memcpy(data->old_opp.supplies, old_supply, size);



	data->new_opp.rate = freq;

	memcpy(data->new_opp.supplies, new_supply, size);



	return opp_table->set_opp(data);

}



/* This is only called for PM domain for now */

static int _set_required_opps(struct device *dev,

			      struct opp_table *opp_table,

			      struct dev_pm_opp *opp)

{

	struct opp_table **required_opp_tables = opp_table->required_opp_tables;

	struct device **genpd_virt_devs = opp_table->genpd_virt_devs;

	unsigned int pstate;

	int i, ret = 0;



	if (!required_opp_tables)

		return 0;



	/* Single genpd case */

	if (!genpd_virt_devs) {

		pstate = opp->required_opps[0]->pstate;

		ret = dev_pm_genpd_set_performance_state(dev, pstate);

		if (ret) {

			dev_err(dev, "Failed to set performance state of %s: %d (%d)\n",

				dev_name(dev), pstate, ret);

		}

		return ret;

	}



	/* Multiple genpd case */



	/*

	 * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev

	 * after it is freed from another thread.

	 */

	mutex_lock(&opp_table->genpd_virt_dev_lock);



	for (i = 0; i < opp_table->required_opp_count; i++) {

		pstate = opp->required_opps[i]->pstate;



		if (!genpd_virt_devs[i])

			continue;



		ret = dev_pm_genpd_set_performance_state(genpd_virt_devs[i], pstate);

		if (ret) {

			dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n",

				dev_name(genpd_virt_devs[i]), pstate, ret);

			break;

		}

	}

	mutex_unlock(&opp_table->genpd_virt_dev_lock);



	return ret;

}



/**

 * dev_pm_opp_set_rate() - Configure new OPP based on frequency

 * @dev:	 device for which we do this operation
@@ -649,7 +689,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) 
	unsigned long freq, old_freq;

	struct dev_pm_opp *old_opp, *opp;

	struct clk *clk;

	int ret, size;

	int ret;



	if (unlikely(!target_freq)) {

		dev_err(dev, "%s: Invalid target frequency %lu\n", __func__,
@@ -702,44 +742,34 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) 
	dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__,

		old_freq, freq);



	/* Only frequency scaling */

	if (!opp_table->regulators) {

		/*

		 * We don't support devices with both regulator and

		 * domain performance-state for now.

		 */

		if (opp_table->genpd_performance_state)

			ret = _generic_set_opp_domain(dev, clk, old_freq, freq,

						      IS_ERR(old_opp) ? 0 : old_opp->pstate,

						      opp->pstate);

		else

			ret = _generic_set_opp_clk_only(dev, clk, old_freq, freq);

	} else if (!opp_table->set_opp) {

	/* Scaling up? Configure required OPPs before frequency */

	if (freq > old_freq) {

		ret = _set_required_opps(dev, opp_table, opp);

		if (ret)

			goto put_opp;

	}



	if (opp_table->set_opp) {

		ret = _set_opp_custom(opp_table, dev, old_freq, freq,

				      IS_ERR(old_opp) ? NULL : old_opp->supplies,

				      opp->supplies);

	} else if (opp_table->regulators) {

		ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq,

						 IS_ERR(old_opp) ? NULL : old_opp->supplies,

						 opp->supplies);

	} else {

		struct dev_pm_set_opp_data *data;



		data = opp_table->set_opp_data;

		data->regulators = opp_table->regulators;

		data->regulator_count = opp_table->regulator_count;

		data->clk = clk;

		data->dev = dev;



		data->old_opp.rate = old_freq;

		size = sizeof(*opp->supplies) * opp_table->regulator_count;

		if (IS_ERR(old_opp))

			memset(data->old_opp.supplies, 0, size);

		else

			memcpy(data->old_opp.supplies, old_opp->supplies, size);



		data->new_opp.rate = freq;

		memcpy(data->new_opp.supplies, opp->supplies, size);

		/* Only frequency scaling */

		ret = _generic_set_opp_clk_only(dev, clk, old_freq, freq);

	}



		ret = opp_table->set_opp(data);

	/* Scaling down? Configure required OPPs after frequency */

	if (!ret && freq < old_freq) {

		ret = _set_required_opps(dev, opp_table, opp);

		if (ret)

			dev_err(dev, "Failed to set required opps: %d\n", ret);

	}



put_opp:

	dev_pm_opp_put(opp);

put_old_opp:

	if (!IS_ERR(old_opp))
@@ -810,8 +840,12 @@ static struct opp_table *_allocate_opp_table(struct device *dev, int index) 
		return NULL;



	mutex_init(&opp_table->lock);

	mutex_init(&opp_table->genpd_virt_dev_lock);

	INIT_LIST_HEAD(&opp_table->dev_list);



	/* Mark regulator count uninitialized */

	opp_table->regulator_count = -1;



	opp_dev = _add_opp_dev(dev, opp_table);

	if (!opp_dev) {

		kfree(opp_table);
@@ -888,6 +922,8 @@ static void _opp_table_kref_release(struct kref *kref) 
	struct opp_table *opp_table = container_of(kref, struct opp_table, kref);

	struct opp_device *opp_dev, *temp;



	_of_clear_opp_table(opp_table);



	/* Release clk */

	if (!IS_ERR(opp_table->clk))

		clk_put(opp_table->clk);
@@ -905,6 +941,7 @@ static void _opp_table_kref_release(struct kref *kref) 
		_remove_opp_dev(opp_dev, opp_table);

	}



	mutex_destroy(&opp_table->genpd_virt_dev_lock);

	mutex_destroy(&opp_table->lock);

	list_del(&opp_table->node);

	kfree(opp_table);
@@ -961,6 +998,7 @@ static void _opp_kref_release(struct kref *kref) 
	 * frequency/voltage list.

	 */

	blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);

	_of_opp_free_required_opps(opp_table, opp);

	opp_debug_remove_one(opp);

	list_del(&opp->node);

	kfree(opp);
@@ -1028,7 +1066,7 @@ struct dev_pm_opp *_opp_allocate(struct opp_table *table) 
	int count, supply_size;



	/* Allocate space for at least one supply */

	count = table->regulator_count ? table->regulator_count : 1;

	count = table->regulator_count > 0 ? table->regulator_count : 1;

	supply_size = sizeof(*opp->supplies) * count;



	/* allocate new OPP node and supplies structures */
@@ -1049,6 +1087,9 @@ static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, 
	struct regulator *reg;

	int i;



	if (!opp_table->regulators)

		return true;



	for (i = 0; i < opp_table->regulator_count; i++) {

		reg = opp_table->regulators[i];
@@ -1333,7 +1374,7 @@ static int _allocate_set_opp_data(struct opp_table *opp_table) 
	struct dev_pm_set_opp_data *data;

	int len, count = opp_table->regulator_count;



	if (WARN_ON(!count))

	if (WARN_ON(!opp_table->regulators))

		return -EINVAL;



	/* space for set_opp_data */
@@ -1430,7 +1471,7 @@ free_regulators: 


	kfree(opp_table->regulators);

	opp_table->regulators = NULL;

	opp_table->regulator_count = 0;

	opp_table->regulator_count = -1;

err:

	dev_pm_opp_put_opp_table(opp_table);
@@ -1459,7 +1500,7 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table) 


	kfree(opp_table->regulators);

	opp_table->regulators = NULL;

	opp_table->regulator_count = 0;

	opp_table->regulator_count = -1;



put_opp_table:

	dev_pm_opp_put_opp_table(opp_table);
@@ -1586,6 +1627,155 @@ void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table) 
}

EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper);



/**

 * dev_pm_opp_set_genpd_virt_dev - Set virtual genpd device for an index

 * @dev: Consumer device for which the genpd device is getting set.

 * @virt_dev: virtual genpd device.

 * @index: index.

 *

 * Multiple generic power domains for a device are supported with the help of

 * virtual genpd devices, which are created for each consumer device - genpd

 * pair. These are the device structures which are attached to the power domain

 * and are required by the OPP core to set the performance state of the genpd.

 *

 * This helper will normally be called by the consumer driver of the device

 * "dev", as only that has details of the genpd devices.

 *

 * This helper needs to be called once for each of those virtual devices, but

 * only if multiple domains are available for a device. Otherwise the original

 * device structure will be used instead by the OPP core.

 */

struct opp_table *dev_pm_opp_set_genpd_virt_dev(struct device *dev,

						struct device *virt_dev,

						int index)

{

	struct opp_table *opp_table;



	opp_table = dev_pm_opp_get_opp_table(dev);

	if (!opp_table)

		return ERR_PTR(-ENOMEM);



	mutex_lock(&opp_table->genpd_virt_dev_lock);



	if (unlikely(!opp_table->genpd_virt_devs ||

		     index >= opp_table->required_opp_count ||

		     opp_table->genpd_virt_devs[index])) {



		dev_err(dev, "Invalid request to set required device\n");

		dev_pm_opp_put_opp_table(opp_table);

		mutex_unlock(&opp_table->genpd_virt_dev_lock);



		return ERR_PTR(-EINVAL);

	}



	opp_table->genpd_virt_devs[index] = virt_dev;

	mutex_unlock(&opp_table->genpd_virt_dev_lock);



	return opp_table;

}



/**

 * dev_pm_opp_put_genpd_virt_dev() - Releases resources blocked for genpd device.

 * @opp_table: OPP table returned by dev_pm_opp_set_genpd_virt_dev().

 * @virt_dev: virtual genpd device.

 *

 * This releases the resource previously acquired with a call to

 * dev_pm_opp_set_genpd_virt_dev(). The consumer driver shall call this helper

 * if it doesn't want OPP core to update performance state of a power domain

 * anymore.

 */

void dev_pm_opp_put_genpd_virt_dev(struct opp_table *opp_table,

				   struct device *virt_dev)

{

	int i;



	/*

	 * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting

	 * used in parallel.

	 */

	mutex_lock(&opp_table->genpd_virt_dev_lock);



	for (i = 0; i < opp_table->required_opp_count; i++) {

		if (opp_table->genpd_virt_devs[i] != virt_dev)

			continue;



		opp_table->genpd_virt_devs[i] = NULL;

		dev_pm_opp_put_opp_table(opp_table);



		/* Drop the vote */

		dev_pm_genpd_set_performance_state(virt_dev, 0);

		break;

	}



	mutex_unlock(&opp_table->genpd_virt_dev_lock);



	if (unlikely(i == opp_table->required_opp_count))

		dev_err(virt_dev, "Failed to find required device entry\n");

}



/**

 * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table.

 * @src_table: OPP table which has dst_table as one of its required OPP table.

 * @dst_table: Required OPP table of the src_table.

 * @pstate: Current performance state of the src_table.

 *

 * This Returns pstate of the OPP (present in @dst_table) pointed out by the

 * "required-opps" property of the OPP (present in @src_table) which has

 * performance state set to @pstate.

 *

 * Return: Zero or positive performance state on success, otherwise negative

 * value on errors.

 */

int dev_pm_opp_xlate_performance_state(struct opp_table *src_table,

				       struct opp_table *dst_table,

				       unsigned int pstate)

{

	struct dev_pm_opp *opp;

	int dest_pstate = -EINVAL;

	int i;



	if (!pstate)

		return 0;



	/*

	 * Normally the src_table will have the "required_opps" property set to

	 * point to one of the OPPs in the dst_table, but in some cases the

	 * genpd and its master have one to one mapping of performance states

	 * and so none of them have the "required-opps" property set. Return the

	 * pstate of the src_table as it is in such cases.

	 */

	if (!src_table->required_opp_count)

		return pstate;



	for (i = 0; i < src_table->required_opp_count; i++) {

		if (src_table->required_opp_tables[i]->np == dst_table->np)

			break;

	}



	if (unlikely(i == src_table->required_opp_count)) {

		pr_err("%s: Couldn't find matching OPP table (%p: %p)\n",

		       __func__, src_table, dst_table);

		return -EINVAL;

	}



	mutex_lock(&src_table->lock);



	list_for_each_entry(opp, &src_table->opp_list, node) {

		if (opp->pstate == pstate) {

			dest_pstate = opp->required_opps[i]->pstate;

			goto unlock;

		}

	}



	pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table,

	       dst_table);



unlock:

	mutex_unlock(&src_table->lock);



	return dest_pstate;

}



/**

 * dev_pm_opp_add()  - Add an OPP table from a table definitions

 * @dev:	device for which we do this operation
@@ -1612,6 +1802,9 @@ int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) 
	if (!opp_table)

		return -ENOMEM;



	/* Fix regulator count for dynamic OPPs */

	opp_table->regulator_count = 1;



	ret = _opp_add_v1(opp_table, dev, freq, u_volt, true);

	if (ret)

		dev_pm_opp_put_opp_table(opp_table);

drivers/opp/of.c

+294 −45

File changed.

Preview size limit exceeded, changes collapsed.

drivers/opp/opp.h

+24 −2

File changed.

Preview size limit exceeded, changes collapsed.

include/linux/pm_domain.h

+10 −4
Original line number Diff line number Diff line
@@ -73,6 +73,7 @@ struct genpd_power_state { 


struct genpd_lock_ops;

struct dev_pm_opp;

struct opp_table;



struct generic_pm_domain {

	struct device dev;
@@ -94,6 +95,7 @@ struct generic_pm_domain { 
	unsigned int performance_state;	/* Aggregated max performance state */

	int (*power_off)(struct generic_pm_domain *domain);

	int (*power_on)(struct generic_pm_domain *domain);

	struct opp_table *opp_table;	/* OPP table of the genpd */

	unsigned int (*opp_to_performance_state)(struct generic_pm_domain *genpd,

						 struct dev_pm_opp *opp);

	int (*set_performance_state)(struct generic_pm_domain *genpd,
@@ -134,6 +136,10 @@ struct gpd_link { 
	struct list_head master_node;

	struct generic_pm_domain *slave;

	struct list_head slave_node;



	/* Sub-domain's per-master domain performance state */

	unsigned int performance_state;

	unsigned int prev_performance_state;

};



struct gpd_timing_data {
@@ -258,8 +264,8 @@ int of_genpd_add_subdomain(struct of_phandle_args *parent, 
struct generic_pm_domain *of_genpd_remove_last(struct device_node *np);

int of_genpd_parse_idle_states(struct device_node *dn,

			       struct genpd_power_state **states, int *n);

unsigned int of_genpd_opp_to_performance_state(struct device *dev,

				struct device_node *np);

unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev,

					       struct dev_pm_opp *opp);



int genpd_dev_pm_attach(struct device *dev);

struct device *genpd_dev_pm_attach_by_id(struct device *dev,
@@ -300,8 +306,8 @@ static inline int of_genpd_parse_idle_states(struct device_node *dn, 
}



static inline unsigned int

of_genpd_opp_to_performance_state(struct device *dev,

				  struct device_node *np)

pm_genpd_opp_to_performance_state(struct device *genpd_dev,

				  struct dev_pm_opp *opp)

{

	return 0;

}

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