diff options
Diffstat (limited to 'drivers/interconnect/core.c')
| -rw-r--r-- | drivers/interconnect/core.c | 161 |
1 files changed, 136 insertions, 25 deletions
diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c index 2c6515e3ecf1..e5f998744501 100644 --- a/drivers/interconnect/core.c +++ b/drivers/interconnect/core.c @@ -158,6 +158,7 @@ static struct icc_path *path_init(struct device *dev, struct icc_node *dst, hlist_add_head(&path->reqs[i].req_node, &node->req_list); path->reqs[i].node = node; path->reqs[i].dev = dev; + path->reqs[i].enabled = true; /* reference to previous node was saved during path traversal */ node = node->reverse; } @@ -249,9 +250,12 @@ static int aggregate_requests(struct icc_node *node) if (p->pre_aggregate) p->pre_aggregate(node); - hlist_for_each_entry(r, &node->req_list, req_node) + hlist_for_each_entry(r, &node->req_list, req_node) { + if (!r->enabled) + continue; p->aggregate(node, r->tag, r->avg_bw, r->peak_bw, &node->avg_bw, &node->peak_bw); + } return 0; } @@ -350,10 +354,35 @@ static struct icc_node *of_icc_get_from_provider(struct of_phandle_args *spec) return node; } +static void devm_icc_release(struct device *dev, void *res) +{ + icc_put(*(struct icc_path **)res); +} + +struct icc_path *devm_of_icc_get(struct device *dev, const char *name) +{ + struct icc_path **ptr, *path; + + ptr = devres_alloc(devm_icc_release, sizeof(**ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + path = of_icc_get(dev, name); + if (!IS_ERR(path)) { + *ptr = path; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return path; +} +EXPORT_SYMBOL_GPL(devm_of_icc_get); + /** - * of_icc_get() - get a path handle from a DT node based on name + * of_icc_get_by_index() - get a path handle from a DT node based on index * @dev: device pointer for the consumer device - * @name: interconnect path name + * @idx: interconnect path index * * This function will search for a path between two endpoints and return an * icc_path handle on success. Use icc_put() to release constraints when they @@ -365,13 +394,12 @@ static struct icc_node *of_icc_get_from_provider(struct of_phandle_args *spec) * Return: icc_path pointer on success or ERR_PTR() on error. NULL is returned * when the API is disabled or the "interconnects" DT property is missing. */ -struct icc_path *of_icc_get(struct device *dev, const char *name) +struct icc_path *of_icc_get_by_index(struct device *dev, int idx) { - struct icc_path *path = ERR_PTR(-EPROBE_DEFER); + struct icc_path *path; struct icc_node *src_node, *dst_node; - struct device_node *np = NULL; + struct device_node *np; struct of_phandle_args src_args, dst_args; - int idx = 0; int ret; if (!dev || !dev->of_node) @@ -391,12 +419,6 @@ struct icc_path *of_icc_get(struct device *dev, const char *name) * lets support only global ids and extend this in the future if needed * without breaking DT compatibility. */ - if (name) { - idx = of_property_match_string(np, "interconnect-names", name); - if (idx < 0) - return ERR_PTR(idx); - } - ret = of_parse_phandle_with_args(np, "interconnects", "#interconnect-cells", idx * 2, &src_args); @@ -439,12 +461,8 @@ struct icc_path *of_icc_get(struct device *dev, const char *name) return path; } - if (name) - path->name = kstrdup_const(name, GFP_KERNEL); - else - path->name = kasprintf(GFP_KERNEL, "%s-%s", - src_node->name, dst_node->name); - + path->name = kasprintf(GFP_KERNEL, "%s-%s", + src_node->name, dst_node->name); if (!path->name) { kfree(path); return ERR_PTR(-ENOMEM); @@ -452,6 +470,53 @@ struct icc_path *of_icc_get(struct device *dev, const char *name) return path; } +EXPORT_SYMBOL_GPL(of_icc_get_by_index); + +/** + * of_icc_get() - get a path handle from a DT node based on name + * @dev: device pointer for the consumer device + * @name: interconnect path name + * + * This function will search for a path between two endpoints and return an + * icc_path handle on success. Use icc_put() to release constraints when they + * are not needed anymore. + * If the interconnect API is disabled, NULL is returned and the consumer + * drivers will still build. Drivers are free to handle this specifically, + * but they don't have to. + * + * Return: icc_path pointer on success or ERR_PTR() on error. NULL is returned + * when the API is disabled or the "interconnects" DT property is missing. + */ +struct icc_path *of_icc_get(struct device *dev, const char *name) +{ + struct device_node *np; + int idx = 0; + + if (!dev || !dev->of_node) + return ERR_PTR(-ENODEV); + + np = dev->of_node; + + /* + * When the consumer DT node do not have "interconnects" property + * return a NULL path to skip setting constraints. + */ + if (!of_find_property(np, "interconnects", NULL)) + return NULL; + + /* + * We use a combination of phandle and specifier for endpoint. For now + * lets support only global ids and extend this in the future if needed + * without breaking DT compatibility. + */ + if (name) { + idx = of_property_match_string(np, "interconnect-names", name); + if (idx < 0) + return ERR_PTR(idx); + } + + return of_icc_get_by_index(dev, idx); +} EXPORT_SYMBOL_GPL(of_icc_get); /** @@ -479,6 +544,24 @@ void icc_set_tag(struct icc_path *path, u32 tag) EXPORT_SYMBOL_GPL(icc_set_tag); /** + * icc_get_name() - Get name of the icc path + * @path: reference to the path returned by icc_get() + * + * This function is used by an interconnect consumer to get the name of the icc + * path. + * + * Returns a valid pointer on success, or NULL otherwise. + */ +const char *icc_get_name(struct icc_path *path) +{ + if (!path) + return NULL; + + return path->name; +} +EXPORT_SYMBOL_GPL(icc_get_name); + +/** * icc_set_bw() - set bandwidth constraints on an interconnect path * @path: reference to the path returned by icc_get() * @avg_bw: average bandwidth in kilobytes per second @@ -546,6 +629,39 @@ int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw) } EXPORT_SYMBOL_GPL(icc_set_bw); +static int __icc_enable(struct icc_path *path, bool enable) +{ + int i; + + if (!path) + return 0; + + if (WARN_ON(IS_ERR(path) || !path->num_nodes)) + return -EINVAL; + + mutex_lock(&icc_lock); + + for (i = 0; i < path->num_nodes; i++) + path->reqs[i].enabled = enable; + + mutex_unlock(&icc_lock); + + return icc_set_bw(path, path->reqs[0].avg_bw, + path->reqs[0].peak_bw); +} + +int icc_enable(struct icc_path *path) +{ + return __icc_enable(path, true); +} +EXPORT_SYMBOL_GPL(icc_enable); + +int icc_disable(struct icc_path *path) +{ + return __icc_enable(path, false); +} +EXPORT_SYMBOL_GPL(icc_disable); + /** * icc_get() - return a handle for path between two endpoints * @dev: the device requesting the path @@ -908,12 +1024,7 @@ static int __init icc_init(void) return 0; } -static void __exit icc_exit(void) -{ - debugfs_remove_recursive(icc_debugfs_dir); -} -module_init(icc_init); -module_exit(icc_exit); +device_initcall(icc_init); MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>"); MODULE_DESCRIPTION("Interconnect Driver Core"); |