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![Grant Likely](/assets/img/avatar_default.png)
Fix a trivial typo in a comment block. Signed-off-by: Grant Likely <grant.likely@linaro.org>
660 lines
16 KiB
C
660 lines
16 KiB
C
/*
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* Support for dynamic device trees.
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*
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* On some platforms, the device tree can be manipulated at runtime.
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* The routines in this section support adding, removing and changing
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* device tree nodes.
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*/
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#include <linux/of.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/proc_fs.h>
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#include "of_private.h"
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/**
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* of_node_get() - Increment refcount of a node
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* @node: Node to inc refcount, NULL is supported to simplify writing of
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* callers
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*
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* Returns node.
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*/
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struct device_node *of_node_get(struct device_node *node)
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{
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if (node)
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kobject_get(&node->kobj);
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return node;
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}
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EXPORT_SYMBOL(of_node_get);
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/**
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* of_node_put() - Decrement refcount of a node
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* @node: Node to dec refcount, NULL is supported to simplify writing of
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* callers
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*/
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void of_node_put(struct device_node *node)
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{
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if (node)
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kobject_put(&node->kobj);
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}
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EXPORT_SYMBOL(of_node_put);
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void __of_detach_node_sysfs(struct device_node *np)
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{
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struct property *pp;
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BUG_ON(!of_node_is_initialized(np));
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if (!of_kset)
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return;
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/* only remove properties if on sysfs */
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if (of_node_is_attached(np)) {
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for_each_property_of_node(np, pp)
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sysfs_remove_bin_file(&np->kobj, &pp->attr);
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kobject_del(&np->kobj);
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}
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/* finally remove the kobj_init ref */
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of_node_put(np);
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}
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static BLOCKING_NOTIFIER_HEAD(of_reconfig_chain);
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int of_reconfig_notifier_register(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&of_reconfig_chain, nb);
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}
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EXPORT_SYMBOL_GPL(of_reconfig_notifier_register);
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int of_reconfig_notifier_unregister(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&of_reconfig_chain, nb);
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}
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EXPORT_SYMBOL_GPL(of_reconfig_notifier_unregister);
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int of_reconfig_notify(unsigned long action, void *p)
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{
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int rc;
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rc = blocking_notifier_call_chain(&of_reconfig_chain, action, p);
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return notifier_to_errno(rc);
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}
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int of_property_notify(int action, struct device_node *np,
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struct property *prop, struct property *oldprop)
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{
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struct of_prop_reconfig pr;
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/* only call notifiers if the node is attached */
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if (!of_node_is_attached(np))
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return 0;
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pr.dn = np;
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pr.prop = prop;
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pr.old_prop = oldprop;
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return of_reconfig_notify(action, &pr);
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}
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void __of_attach_node(struct device_node *np)
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{
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const __be32 *phandle;
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int sz;
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np->name = __of_get_property(np, "name", NULL) ? : "<NULL>";
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np->type = __of_get_property(np, "device_type", NULL) ? : "<NULL>";
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phandle = __of_get_property(np, "phandle", &sz);
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if (!phandle)
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phandle = __of_get_property(np, "linux,phandle", &sz);
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if (IS_ENABLED(PPC_PSERIES) && !phandle)
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phandle = __of_get_property(np, "ibm,phandle", &sz);
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np->phandle = (phandle && (sz >= 4)) ? be32_to_cpup(phandle) : 0;
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np->child = NULL;
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np->sibling = np->parent->child;
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np->allnext = np->parent->allnext;
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np->parent->allnext = np;
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np->parent->child = np;
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of_node_clear_flag(np, OF_DETACHED);
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}
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/**
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* of_attach_node() - Plug a device node into the tree and global list.
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*/
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int of_attach_node(struct device_node *np)
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{
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unsigned long flags;
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mutex_lock(&of_mutex);
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raw_spin_lock_irqsave(&devtree_lock, flags);
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__of_attach_node(np);
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raw_spin_unlock_irqrestore(&devtree_lock, flags);
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__of_attach_node_sysfs(np);
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mutex_unlock(&of_mutex);
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of_reconfig_notify(OF_RECONFIG_ATTACH_NODE, np);
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return 0;
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}
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void __of_detach_node(struct device_node *np)
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{
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struct device_node *parent;
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if (WARN_ON(of_node_check_flag(np, OF_DETACHED)))
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return;
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parent = np->parent;
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if (WARN_ON(!parent))
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return;
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if (of_allnodes == np)
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of_allnodes = np->allnext;
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else {
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struct device_node *prev;
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for (prev = of_allnodes;
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prev->allnext != np;
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prev = prev->allnext)
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;
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prev->allnext = np->allnext;
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}
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if (parent->child == np)
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parent->child = np->sibling;
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else {
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struct device_node *prevsib;
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for (prevsib = np->parent->child;
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prevsib->sibling != np;
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prevsib = prevsib->sibling)
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;
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prevsib->sibling = np->sibling;
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}
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of_node_set_flag(np, OF_DETACHED);
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}
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/**
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* of_detach_node() - "Unplug" a node from the device tree.
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*
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* The caller must hold a reference to the node. The memory associated with
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* the node is not freed until its refcount goes to zero.
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*/
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int of_detach_node(struct device_node *np)
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{
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unsigned long flags;
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int rc = 0;
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mutex_lock(&of_mutex);
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raw_spin_lock_irqsave(&devtree_lock, flags);
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__of_detach_node(np);
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raw_spin_unlock_irqrestore(&devtree_lock, flags);
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__of_detach_node_sysfs(np);
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mutex_unlock(&of_mutex);
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of_reconfig_notify(OF_RECONFIG_DETACH_NODE, np);
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return rc;
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}
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/**
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* of_node_release() - release a dynamically allocated node
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* @kref: kref element of the node to be released
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*
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* In of_node_put() this function is passed to kref_put() as the destructor.
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*/
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void of_node_release(struct kobject *kobj)
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{
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struct device_node *node = kobj_to_device_node(kobj);
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struct property *prop = node->properties;
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/* We should never be releasing nodes that haven't been detached. */
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if (!of_node_check_flag(node, OF_DETACHED)) {
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pr_err("ERROR: Bad of_node_put() on %s\n", node->full_name);
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dump_stack();
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return;
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}
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if (!of_node_check_flag(node, OF_DYNAMIC))
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return;
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while (prop) {
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struct property *next = prop->next;
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kfree(prop->name);
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kfree(prop->value);
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kfree(prop);
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prop = next;
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if (!prop) {
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prop = node->deadprops;
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node->deadprops = NULL;
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}
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}
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kfree(node->full_name);
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kfree(node->data);
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kfree(node);
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}
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/**
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* __of_prop_dup - Copy a property dynamically.
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* @prop: Property to copy
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* @allocflags: Allocation flags (typically pass GFP_KERNEL)
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*
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* Copy a property by dynamically allocating the memory of both the
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* property stucture and the property name & contents. The property's
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* flags have the OF_DYNAMIC bit set so that we can differentiate between
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* dynamically allocated properties and not.
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* Returns the newly allocated property or NULL on out of memory error.
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*/
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struct property *__of_prop_dup(const struct property *prop, gfp_t allocflags)
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{
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struct property *new;
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new = kzalloc(sizeof(*new), allocflags);
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if (!new)
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return NULL;
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/*
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* NOTE: There is no check for zero length value.
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* In case of a boolean property, this will allocate a value
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* of zero bytes. We do this to work around the use
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* of of_get_property() calls on boolean values.
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*/
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new->name = kstrdup(prop->name, allocflags);
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new->value = kmemdup(prop->value, prop->length, allocflags);
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new->length = prop->length;
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if (!new->name || !new->value)
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goto err_free;
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/* mark the property as dynamic */
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of_property_set_flag(new, OF_DYNAMIC);
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return new;
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err_free:
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kfree(new->name);
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kfree(new->value);
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kfree(new);
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return NULL;
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}
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/**
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* __of_node_alloc() - Create an empty device node dynamically.
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* @full_name: Full name of the new device node
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* @allocflags: Allocation flags (typically pass GFP_KERNEL)
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*
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* Create an empty device tree node, suitable for further modification.
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* The node data are dynamically allocated and all the node flags
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* have the OF_DYNAMIC & OF_DETACHED bits set.
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* Returns the newly allocated node or NULL on out of memory error.
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*/
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struct device_node *__of_node_alloc(const char *full_name, gfp_t allocflags)
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{
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struct device_node *node;
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node = kzalloc(sizeof(*node), allocflags);
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if (!node)
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return NULL;
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node->full_name = kstrdup(full_name, allocflags);
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of_node_set_flag(node, OF_DYNAMIC);
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of_node_set_flag(node, OF_DETACHED);
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if (!node->full_name)
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goto err_free;
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of_node_init(node);
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return node;
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err_free:
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kfree(node->full_name);
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kfree(node);
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return NULL;
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}
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static void __of_changeset_entry_destroy(struct of_changeset_entry *ce)
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{
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of_node_put(ce->np);
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list_del(&ce->node);
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kfree(ce);
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}
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#ifdef DEBUG
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static void __of_changeset_entry_dump(struct of_changeset_entry *ce)
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{
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switch (ce->action) {
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case OF_RECONFIG_ADD_PROPERTY:
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pr_debug("%p: %s %s/%s\n",
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ce, "ADD_PROPERTY ", ce->np->full_name,
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ce->prop->name);
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break;
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case OF_RECONFIG_REMOVE_PROPERTY:
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pr_debug("%p: %s %s/%s\n",
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ce, "REMOVE_PROPERTY", ce->np->full_name,
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ce->prop->name);
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break;
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case OF_RECONFIG_UPDATE_PROPERTY:
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pr_debug("%p: %s %s/%s\n",
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ce, "UPDATE_PROPERTY", ce->np->full_name,
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ce->prop->name);
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break;
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case OF_RECONFIG_ATTACH_NODE:
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pr_debug("%p: %s %s\n",
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ce, "ATTACH_NODE ", ce->np->full_name);
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break;
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case OF_RECONFIG_DETACH_NODE:
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pr_debug("%p: %s %s\n",
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ce, "DETACH_NODE ", ce->np->full_name);
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break;
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}
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}
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#else
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static inline void __of_changeset_entry_dump(struct of_changeset_entry *ce)
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{
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/* empty */
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}
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#endif
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static void __of_changeset_entry_invert(struct of_changeset_entry *ce,
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struct of_changeset_entry *rce)
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{
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memcpy(rce, ce, sizeof(*rce));
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switch (ce->action) {
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case OF_RECONFIG_ATTACH_NODE:
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rce->action = OF_RECONFIG_DETACH_NODE;
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break;
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case OF_RECONFIG_DETACH_NODE:
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rce->action = OF_RECONFIG_ATTACH_NODE;
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break;
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case OF_RECONFIG_ADD_PROPERTY:
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rce->action = OF_RECONFIG_REMOVE_PROPERTY;
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break;
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case OF_RECONFIG_REMOVE_PROPERTY:
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rce->action = OF_RECONFIG_ADD_PROPERTY;
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break;
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case OF_RECONFIG_UPDATE_PROPERTY:
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rce->old_prop = ce->prop;
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rce->prop = ce->old_prop;
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break;
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}
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}
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static void __of_changeset_entry_notify(struct of_changeset_entry *ce, bool revert)
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{
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struct of_changeset_entry ce_inverted;
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int ret;
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if (revert) {
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__of_changeset_entry_invert(ce, &ce_inverted);
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ce = &ce_inverted;
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}
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switch (ce->action) {
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case OF_RECONFIG_ATTACH_NODE:
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case OF_RECONFIG_DETACH_NODE:
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ret = of_reconfig_notify(ce->action, ce->np);
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break;
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case OF_RECONFIG_ADD_PROPERTY:
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case OF_RECONFIG_REMOVE_PROPERTY:
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case OF_RECONFIG_UPDATE_PROPERTY:
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ret = of_property_notify(ce->action, ce->np, ce->prop, ce->old_prop);
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break;
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default:
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pr_err("%s: invalid devicetree changeset action: %i\n", __func__,
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(int)ce->action);
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return;
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}
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if (ret)
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pr_err("%s: notifier error @%s\n", __func__, ce->np->full_name);
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}
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static int __of_changeset_entry_apply(struct of_changeset_entry *ce)
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{
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struct property *old_prop, **propp;
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unsigned long flags;
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int ret = 0;
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__of_changeset_entry_dump(ce);
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raw_spin_lock_irqsave(&devtree_lock, flags);
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switch (ce->action) {
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case OF_RECONFIG_ATTACH_NODE:
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__of_attach_node(ce->np);
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break;
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case OF_RECONFIG_DETACH_NODE:
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__of_detach_node(ce->np);
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break;
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case OF_RECONFIG_ADD_PROPERTY:
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/* If the property is in deadprops then it must be removed */
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for (propp = &ce->np->deadprops; *propp; propp = &(*propp)->next) {
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if (*propp == ce->prop) {
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*propp = ce->prop->next;
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ce->prop->next = NULL;
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break;
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}
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}
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ret = __of_add_property(ce->np, ce->prop);
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if (ret) {
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pr_err("%s: add_property failed @%s/%s\n",
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__func__, ce->np->full_name,
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ce->prop->name);
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break;
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}
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break;
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case OF_RECONFIG_REMOVE_PROPERTY:
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ret = __of_remove_property(ce->np, ce->prop);
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if (ret) {
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pr_err("%s: remove_property failed @%s/%s\n",
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__func__, ce->np->full_name,
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ce->prop->name);
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break;
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}
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break;
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case OF_RECONFIG_UPDATE_PROPERTY:
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/* If the property is in deadprops then it must be removed */
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for (propp = &ce->np->deadprops; *propp; propp = &(*propp)->next) {
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if (*propp == ce->prop) {
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*propp = ce->prop->next;
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ce->prop->next = NULL;
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break;
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}
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}
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ret = __of_update_property(ce->np, ce->prop, &old_prop);
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if (ret) {
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pr_err("%s: update_property failed @%s/%s\n",
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__func__, ce->np->full_name,
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ce->prop->name);
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break;
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}
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break;
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default:
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ret = -EINVAL;
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}
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raw_spin_unlock_irqrestore(&devtree_lock, flags);
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if (ret)
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return ret;
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switch (ce->action) {
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case OF_RECONFIG_ATTACH_NODE:
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__of_attach_node_sysfs(ce->np);
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break;
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case OF_RECONFIG_DETACH_NODE:
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__of_detach_node_sysfs(ce->np);
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break;
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case OF_RECONFIG_ADD_PROPERTY:
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/* ignore duplicate names */
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__of_add_property_sysfs(ce->np, ce->prop);
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break;
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case OF_RECONFIG_REMOVE_PROPERTY:
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__of_remove_property_sysfs(ce->np, ce->prop);
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break;
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case OF_RECONFIG_UPDATE_PROPERTY:
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__of_update_property_sysfs(ce->np, ce->prop, ce->old_prop);
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break;
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}
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return 0;
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}
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static inline int __of_changeset_entry_revert(struct of_changeset_entry *ce)
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{
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struct of_changeset_entry ce_inverted;
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__of_changeset_entry_invert(ce, &ce_inverted);
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return __of_changeset_entry_apply(&ce_inverted);
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}
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/**
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* of_changeset_init - Initialize a changeset for use
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*
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* @ocs: changeset pointer
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*
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* Initialize a changeset structure
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*/
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void of_changeset_init(struct of_changeset *ocs)
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{
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memset(ocs, 0, sizeof(*ocs));
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INIT_LIST_HEAD(&ocs->entries);
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}
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/**
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* of_changeset_destroy - Destroy a changeset
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*
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* @ocs: changeset pointer
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*
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* Destroys a changeset. Note that if a changeset is applied,
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* its changes to the tree cannot be reverted.
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*/
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void of_changeset_destroy(struct of_changeset *ocs)
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{
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struct of_changeset_entry *ce, *cen;
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list_for_each_entry_safe_reverse(ce, cen, &ocs->entries, node)
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__of_changeset_entry_destroy(ce);
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}
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/**
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* of_changeset_apply - Applies a changeset
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*
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* @ocs: changeset pointer
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*
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* Applies a changeset to the live tree.
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* Any side-effects of live tree state changes are applied here on
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* sucess, like creation/destruction of devices and side-effects
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* like creation of sysfs properties and directories.
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* Returns 0 on success, a negative error value in case of an error.
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* On error the partially applied effects are reverted.
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*/
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int of_changeset_apply(struct of_changeset *ocs)
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{
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struct of_changeset_entry *ce;
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int ret;
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/* perform the rest of the work */
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pr_debug("of_changeset: applying...\n");
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list_for_each_entry(ce, &ocs->entries, node) {
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ret = __of_changeset_entry_apply(ce);
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if (ret) {
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pr_err("%s: Error applying changeset (%d)\n", __func__, ret);
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list_for_each_entry_continue_reverse(ce, &ocs->entries, node)
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__of_changeset_entry_revert(ce);
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return ret;
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}
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}
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pr_debug("of_changeset: applied, emitting notifiers.\n");
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/* drop the global lock while emitting notifiers */
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mutex_unlock(&of_mutex);
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list_for_each_entry(ce, &ocs->entries, node)
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__of_changeset_entry_notify(ce, 0);
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mutex_lock(&of_mutex);
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pr_debug("of_changeset: notifiers sent.\n");
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return 0;
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}
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/**
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* of_changeset_revert - Reverts an applied changeset
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*
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* @ocs: changeset pointer
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*
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* Reverts a changeset returning the state of the tree to what it
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* was before the application.
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* Any side-effects like creation/destruction of devices and
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* removal of sysfs properties and directories are applied.
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* Returns 0 on success, a negative error value in case of an error.
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*/
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int of_changeset_revert(struct of_changeset *ocs)
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{
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struct of_changeset_entry *ce;
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int ret;
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pr_debug("of_changeset: reverting...\n");
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list_for_each_entry_reverse(ce, &ocs->entries, node) {
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ret = __of_changeset_entry_revert(ce);
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if (ret) {
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pr_err("%s: Error reverting changeset (%d)\n", __func__, ret);
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list_for_each_entry_continue(ce, &ocs->entries, node)
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__of_changeset_entry_apply(ce);
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return ret;
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}
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}
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pr_debug("of_changeset: reverted, emitting notifiers.\n");
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/* drop the global lock while emitting notifiers */
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mutex_unlock(&of_mutex);
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list_for_each_entry_reverse(ce, &ocs->entries, node)
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__of_changeset_entry_notify(ce, 1);
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mutex_lock(&of_mutex);
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pr_debug("of_changeset: notifiers sent.\n");
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return 0;
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}
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/**
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* of_changeset_action - Perform a changeset action
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*
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* @ocs: changeset pointer
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* @action: action to perform
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* @np: Pointer to device node
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* @prop: Pointer to property
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*
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* On action being one of:
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* + OF_RECONFIG_ATTACH_NODE
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* + OF_RECONFIG_DETACH_NODE,
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* + OF_RECONFIG_ADD_PROPERTY
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* + OF_RECONFIG_REMOVE_PROPERTY,
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* + OF_RECONFIG_UPDATE_PROPERTY
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* Returns 0 on success, a negative error value in case of an error.
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*/
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int of_changeset_action(struct of_changeset *ocs, unsigned long action,
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struct device_node *np, struct property *prop)
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{
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struct of_changeset_entry *ce;
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ce = kzalloc(sizeof(*ce), GFP_KERNEL);
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if (!ce) {
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pr_err("%s: Failed to allocate\n", __func__);
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return -ENOMEM;
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}
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/* get a reference to the node */
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ce->action = action;
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ce->np = of_node_get(np);
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ce->prop = prop;
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if (action == OF_RECONFIG_UPDATE_PROPERTY && prop)
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ce->old_prop = of_find_property(np, prop->name, NULL);
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/* add it to the list */
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list_add_tail(&ce->node, &ocs->entries);
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return 0;
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}
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