diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/remoteproc/remoteproc_core.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index e991512e04ed..e1a6d693b8bb 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -44,6 +44,9 @@ #include "remoteproc_internal.h" +static DEFINE_MUTEX(rproc_list_mutex); +static LIST_HEAD(rproc_list); + typedef int (*rproc_handle_resources_t)(struct rproc *rproc, struct resource_table *table, int len); typedef int (*rproc_handle_resource_t)(struct rproc *rproc, @@ -1145,6 +1148,43 @@ out: EXPORT_SYMBOL(rproc_shutdown); /** + * rproc_get_by_phandle() - find a remote processor by phandle + * @phandle: phandle to the rproc + * + * Finds an rproc handle using the remote processor's phandle, and then + * return a handle to the rproc. + * + * This function increments the remote processor's refcount, so always + * use rproc_put() to decrement it back once rproc isn't needed anymore. + * + * Returns the rproc handle on success, and NULL on failure. + */ +struct rproc *rproc_get_by_phandle(phandle phandle) +{ + struct rproc *rproc = NULL, *r; + struct device_node *np; + + np = of_find_node_by_phandle(phandle); + if (!np) + return NULL; + + mutex_lock(&rproc_list_mutex); + list_for_each_entry(r, &rproc_list, node) { + if (r->dev.parent && r->dev.parent->of_node == np) { + rproc = r; + get_device(&rproc->dev); + break; + } + } + mutex_unlock(&rproc_list_mutex); + + of_node_put(np); + + return rproc; +} +EXPORT_SYMBOL(rproc_get_by_phandle); + +/** * rproc_add() - register a remote processor * @rproc: the remote processor handle to register * @@ -1173,6 +1213,11 @@ int rproc_add(struct rproc *rproc) if (ret < 0) return ret; + /* expose to rproc_get_by_phandle users */ + mutex_lock(&rproc_list_mutex); + list_add(&rproc->node, &rproc_list); + mutex_unlock(&rproc_list_mutex); + dev_info(dev, "%s is available\n", rproc->name); dev_info(dev, "Note: remoteproc is still under development and considered experimental.\n"); @@ -1360,6 +1405,11 @@ int rproc_del(struct rproc *rproc) /* Free the copy of the resource table */ kfree(rproc->cached_table); + /* the rproc is downref'ed as soon as it's removed from the klist */ + mutex_lock(&rproc_list_mutex); + list_del(&rproc->node); + mutex_unlock(&rproc_list_mutex); + device_del(&rproc->dev); return 0; |