#include <linux/module.h>
#include <linux/powercap.h>
#include <linux/scmi_protocol.h>
+#include <linux/slab.h>
#define to_scmi_powercap_zone(z) \
container_of(z, struct scmi_powercap_zone, zone)
static const struct scmi_powercap_proto_ops *powercap_ops;
struct scmi_powercap_zone {
+ bool registered;
+ bool invalid;
unsigned int height;
struct device *dev;
struct scmi_protocol_handle *ph;
unsigned int num_zones;
struct scmi_powercap_zone *spzones;
struct list_head *registered_zones;
+ struct list_head scmi_zones;
};
static struct powercap_control_type *scmi_top_pcntrl;
}
}
-static inline bool
-scmi_powercap_is_zone_registered(struct scmi_powercap_zone *spz)
-{
- return !list_empty(&spz->node);
-}
-
static inline unsigned int
scmi_powercap_get_zone_height(struct scmi_powercap_zone *spz)
{
return &spz->spzones[spz->info->parent_id];
}
+static int scmi_powercap_register_zone(struct scmi_powercap_root *pr,
+ struct scmi_powercap_zone *spz,
+ struct scmi_powercap_zone *parent)
+{
+ int ret = 0;
+ struct powercap_zone *z;
+
+ if (spz->invalid) {
+ list_del(&spz->node);
+ return -EINVAL;
+ }
+
+ z = powercap_register_zone(&spz->zone, scmi_top_pcntrl, spz->info->name,
+ parent ? &parent->zone : NULL,
+ &zone_ops, 1, &constraint_ops);
+ if (!IS_ERR(z)) {
+ spz->height = scmi_powercap_get_zone_height(spz);
+ spz->registered = true;
+ list_move(&spz->node, &pr->registered_zones[spz->height]);
+ dev_dbg(spz->dev, "Registered node %s - parent %s - height:%d\n",
+ spz->info->name, parent ? parent->info->name : "ROOT",
+ spz->height);
+ } else {
+ list_del(&spz->node);
+ ret = PTR_ERR(z);
+ dev_err(spz->dev,
+ "Error registering node:%s - parent:%s - h:%d - ret:%d\n",
+ spz->info->name,
+ parent ? parent->info->name : "ROOT",
+ spz->height, ret);
+ }
+
+ return ret;
+}
+
/**
- * scmi_powercap_register_zone - Register an SCMI powercap zone recursively
+ * scmi_zones_register- Register SCMI powercap zones starting from parent zones
*
+ * @dev: A reference to the SCMI device
* @pr: A reference to the root powercap zones descriptors
- * @spz: A reference to the SCMI powercap zone to register
*
* When registering SCMI powercap zones with the powercap framework we should
* take care to always register zones starting from the root ones and to
* zones provided by the SCMI platform firmware is built to comply with such
* requirement.
*
- * This function, given an SCMI powercap zone to register, takes care to walk
- * the SCMI powercap zones tree up to the root looking recursively for
- * unregistered parent zones before registering the provided zone; at the same
- * time each registered zone height in such a tree is accounted for and each
+ * This function, given the set of SCMI powercap zones to register, takes care
+ * to walk the SCMI powercap zones trees up to the root registering any
+ * unregistered parent zone before registering the child zones; at the same
+ * time each registered-zone height in such a tree is accounted for and each
* zone, once registered, is stored in the @registered_zones array that is
* indexed by zone height: this way will be trivial, at unregister time, to walk
* the @registered_zones array backward and unregister all the zones starting
*
* Return: 0 on Success
*/
-static int scmi_powercap_register_zone(struct scmi_powercap_root *pr,
- struct scmi_powercap_zone *spz)
+static int scmi_zones_register(struct device *dev,
+ struct scmi_powercap_root *pr)
{
int ret = 0;
- struct scmi_powercap_zone *parent;
-
- if (!spz->info)
- return ret;
+ unsigned int sp = 0, reg_zones = 0;
+ struct scmi_powercap_zone *spz, **zones_stack;
- parent = scmi_powercap_get_parent_zone(spz);
- if (parent && !scmi_powercap_is_zone_registered(parent)) {
- /*
- * Bail out if a parent domain was marked as unsupported:
- * only domains participating as leaves can be skipped.
- */
- if (!parent->info)
- return -ENODEV;
+ zones_stack = kcalloc(pr->num_zones, sizeof(spz), GFP_KERNEL);
+ if (!zones_stack)
+ return -ENOMEM;
- ret = scmi_powercap_register_zone(pr, parent);
- if (ret)
- return ret;
- }
+ spz = list_first_entry_or_null(&pr->scmi_zones,
+ struct scmi_powercap_zone, node);
+ while (spz) {
+ struct scmi_powercap_zone *parent;
- if (!scmi_powercap_is_zone_registered(spz)) {
- struct powercap_zone *z;
-
- z = powercap_register_zone(&spz->zone,
- scmi_top_pcntrl,
- spz->info->name,
- parent ? &parent->zone : NULL,
- &zone_ops, 1, &constraint_ops);
- if (!IS_ERR(z)) {
- spz->height = scmi_powercap_get_zone_height(spz);
- list_add(&spz->node,
- &pr->registered_zones[spz->height]);
- dev_dbg(spz->dev,
- "Registered node %s - parent %s - height:%d\n",
- spz->info->name,
- parent ? parent->info->name : "ROOT",
- spz->height);
- ret = 0;
+ parent = scmi_powercap_get_parent_zone(spz);
+ if (parent && !parent->registered) {
+ zones_stack[sp++] = spz;
+ spz = parent;
} else {
- ret = PTR_ERR(z);
- dev_err(spz->dev,
- "Error registering node:%s - parent:%s - h:%d - ret:%d\n",
- spz->info->name,
- parent ? parent->info->name : "ROOT",
- spz->height, ret);
+ ret = scmi_powercap_register_zone(pr, spz, parent);
+ if (!ret) {
+ reg_zones++;
+ } else if (sp) {
+ /* Failed to register a non-leaf zone.
+ * Bail-out.
+ */
+ dev_err(dev,
+ "Failed to register non-leaf zone - ret:%d\n",
+ ret);
+ scmi_powercap_unregister_all_zones(pr);
+ reg_zones = 0;
+ goto out;
+ }
+ /* Pick next zone to process */
+ if (sp)
+ spz = zones_stack[--sp];
+ else
+ spz = list_first_entry_or_null(&pr->scmi_zones,
+ struct scmi_powercap_zone,
+ node);
}
}
+out:
+ kfree(zones_stack);
+ dev_info(dev, "Registered %d SCMI Powercap domains !\n", reg_zones);
+
return ret;
}
if (!pr->registered_zones)
return -ENOMEM;
+ INIT_LIST_HEAD(&pr->scmi_zones);
+
for (i = 0, spz = pr->spzones; i < pr->num_zones; i++, spz++) {
/*
* Powercap domains are validate by the protocol layer, i.e.
INIT_LIST_HEAD(&spz->node);
INIT_LIST_HEAD(&pr->registered_zones[i]);
+ list_add_tail(&spz->node, &pr->scmi_zones);
/*
* Forcibly skip powercap domains using an abstract scale.
* Note that only leaves domains can be skipped, so this could
dev_warn(dev,
"Abstract power scale not supported. Skip %s.\n",
spz->info->name);
- spz->info = NULL;
+ spz->invalid = true;
continue;
}
}
* Scan array of retrieved SCMI powercap domains and register them
* recursively starting from the root domains.
*/
- for (i = 0, spz = pr->spzones; i < pr->num_zones; i++, spz++) {
- ret = scmi_powercap_register_zone(pr, spz);
- if (ret) {
- dev_err(dev,
- "Failed to register powercap zone %s - ret:%d\n",
- spz->info->name, ret);
- scmi_powercap_unregister_all_zones(pr);
- return ret;
- }
- }
+ ret = scmi_zones_register(dev, pr);
+ if (ret)
+ return ret;
dev_set_drvdata(dev, pr);
- dev_info(dev, "Registered %d SCMI Powercap domains !\n", pr->num_zones);
-
return ret;
}
projects / platform / kernel / linux-rpi.git / blobdiff