525 lines
11 KiB
C
525 lines
11 KiB
C
/*
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* pSeries_reconfig.c - support for dynamic reconfiguration (including PCI
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* Hotplug and Dynamic Logical Partitioning on RPA platforms).
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*
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* Copyright (C) 2005 Nathan Lynch
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* Copyright (C) 2005 IBM Corporation
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/notifier.h>
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#include <linux/proc_fs.h>
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#include <asm/prom.h>
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#include <asm/pSeries_reconfig.h>
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#include <asm/uaccess.h>
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/*
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* Routines for "runtime" addition and removal of device tree nodes.
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*/
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#ifdef CONFIG_PROC_DEVICETREE
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/*
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* Add a node to /proc/device-tree.
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*/
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static void add_node_proc_entries(struct device_node *np)
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{
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struct proc_dir_entry *ent;
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ent = proc_mkdir(strrchr(np->full_name, '/') + 1, np->parent->pde);
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if (ent)
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proc_device_tree_add_node(np, ent);
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}
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static void remove_node_proc_entries(struct device_node *np)
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{
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struct property *pp = np->properties;
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struct device_node *parent = np->parent;
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while (pp) {
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remove_proc_entry(pp->name, np->pde);
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pp = pp->next;
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}
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if (np->pde)
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remove_proc_entry(np->pde->name, parent->pde);
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}
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#else /* !CONFIG_PROC_DEVICETREE */
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static void add_node_proc_entries(struct device_node *np)
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{
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return;
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}
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static void remove_node_proc_entries(struct device_node *np)
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{
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return;
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}
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#endif /* CONFIG_PROC_DEVICETREE */
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/**
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* derive_parent - basically like dirname(1)
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* @path: the full_name of a node to be added to the tree
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*
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* Returns the node which should be the parent of the node
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* described by path. E.g., for path = "/foo/bar", returns
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* the node with full_name = "/foo".
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*/
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static struct device_node *derive_parent(const char *path)
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{
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struct device_node *parent = NULL;
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char *parent_path = "/";
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size_t parent_path_len = strrchr(path, '/') - path + 1;
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/* reject if path is "/" */
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if (!strcmp(path, "/"))
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return ERR_PTR(-EINVAL);
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if (strrchr(path, '/') != path) {
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parent_path = kmalloc(parent_path_len, GFP_KERNEL);
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if (!parent_path)
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return ERR_PTR(-ENOMEM);
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strlcpy(parent_path, path, parent_path_len);
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}
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parent = of_find_node_by_path(parent_path);
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if (!parent)
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return ERR_PTR(-EINVAL);
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if (strcmp(parent_path, "/"))
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kfree(parent_path);
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return parent;
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}
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static struct notifier_block *pSeries_reconfig_chain;
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int pSeries_reconfig_notifier_register(struct notifier_block *nb)
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{
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return notifier_chain_register(&pSeries_reconfig_chain, nb);
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}
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void pSeries_reconfig_notifier_unregister(struct notifier_block *nb)
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{
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notifier_chain_unregister(&pSeries_reconfig_chain, nb);
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}
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static int pSeries_reconfig_add_node(const char *path, struct property *proplist)
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{
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struct device_node *np;
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int err = -ENOMEM;
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np = kzalloc(sizeof(*np), GFP_KERNEL);
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if (!np)
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goto out_err;
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np->full_name = kmalloc(strlen(path) + 1, GFP_KERNEL);
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if (!np->full_name)
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goto out_err;
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strcpy(np->full_name, path);
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np->properties = proplist;
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OF_MARK_DYNAMIC(np);
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kref_init(&np->kref);
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np->parent = derive_parent(path);
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if (IS_ERR(np->parent)) {
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err = PTR_ERR(np->parent);
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goto out_err;
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}
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err = notifier_call_chain(&pSeries_reconfig_chain,
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PSERIES_RECONFIG_ADD, np);
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if (err == NOTIFY_BAD) {
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printk(KERN_ERR "Failed to add device node %s\n", path);
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err = -ENOMEM; /* For now, safe to assume kmalloc failure */
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goto out_err;
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}
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of_attach_node(np);
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add_node_proc_entries(np);
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of_node_put(np->parent);
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return 0;
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out_err:
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if (np) {
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of_node_put(np->parent);
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kfree(np->full_name);
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kfree(np);
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}
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return err;
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}
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static int pSeries_reconfig_remove_node(struct device_node *np)
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{
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struct device_node *parent, *child;
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parent = of_get_parent(np);
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if (!parent)
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return -EINVAL;
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if ((child = of_get_next_child(np, NULL))) {
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of_node_put(child);
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return -EBUSY;
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}
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remove_node_proc_entries(np);
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notifier_call_chain(&pSeries_reconfig_chain,
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PSERIES_RECONFIG_REMOVE, np);
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of_detach_node(np);
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of_node_put(parent);
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of_node_put(np); /* Must decrement the refcount */
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return 0;
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}
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/*
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* /proc/ppc64/ofdt - yucky binary interface for adding and removing
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* OF device nodes. Should be deprecated as soon as we get an
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* in-kernel wrapper for the RTAS ibm,configure-connector call.
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*/
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static void release_prop_list(const struct property *prop)
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{
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struct property *next;
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for (; prop; prop = next) {
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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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}
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}
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/**
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* parse_next_property - process the next property from raw input buffer
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* @buf: input buffer, must be nul-terminated
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* @end: end of the input buffer + 1, for validation
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* @name: return value; set to property name in buf
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* @length: return value; set to length of value
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* @value: return value; set to the property value in buf
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*
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* Note that the caller must make copies of the name and value returned,
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* this function does no allocation or copying of the data. Return value
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* is set to the next name in buf, or NULL on error.
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*/
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static char * parse_next_property(char *buf, char *end, char **name, int *length,
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unsigned char **value)
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{
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char *tmp;
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*name = buf;
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tmp = strchr(buf, ' ');
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if (!tmp) {
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printk(KERN_ERR "property parse failed in %s at line %d\n",
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__FUNCTION__, __LINE__);
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return NULL;
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}
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*tmp = '\0';
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if (++tmp >= end) {
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printk(KERN_ERR "property parse failed in %s at line %d\n",
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__FUNCTION__, __LINE__);
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return NULL;
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}
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/* now we're on the length */
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*length = -1;
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*length = simple_strtoul(tmp, &tmp, 10);
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if (*length == -1) {
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printk(KERN_ERR "property parse failed in %s at line %d\n",
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__FUNCTION__, __LINE__);
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return NULL;
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}
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if (*tmp != ' ' || ++tmp >= end) {
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printk(KERN_ERR "property parse failed in %s at line %d\n",
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__FUNCTION__, __LINE__);
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return NULL;
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}
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/* now we're on the value */
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*value = tmp;
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tmp += *length;
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if (tmp > end) {
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printk(KERN_ERR "property parse failed in %s at line %d\n",
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__FUNCTION__, __LINE__);
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return NULL;
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}
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else if (tmp < end && *tmp != ' ' && *tmp != '\0') {
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printk(KERN_ERR "property parse failed in %s at line %d\n",
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__FUNCTION__, __LINE__);
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return NULL;
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}
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tmp++;
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/* and now we should be on the next name, or the end */
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return tmp;
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}
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static struct property *new_property(const char *name, const int length,
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const unsigned char *value, struct property *last)
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{
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struct property *new = kmalloc(sizeof(*new), GFP_KERNEL);
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if (!new)
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return NULL;
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memset(new, 0, sizeof(*new));
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if (!(new->name = kmalloc(strlen(name) + 1, GFP_KERNEL)))
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goto cleanup;
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if (!(new->value = kmalloc(length + 1, GFP_KERNEL)))
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goto cleanup;
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strcpy(new->name, name);
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memcpy(new->value, value, length);
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*(((char *)new->value) + length) = 0;
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new->length = length;
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new->next = last;
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return new;
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cleanup:
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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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static int do_add_node(char *buf, size_t bufsize)
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{
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char *path, *end, *name;
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struct device_node *np;
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struct property *prop = NULL;
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unsigned char* value;
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int length, rv = 0;
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end = buf + bufsize;
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path = buf;
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buf = strchr(buf, ' ');
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if (!buf)
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return -EINVAL;
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*buf = '\0';
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buf++;
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if ((np = of_find_node_by_path(path))) {
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of_node_put(np);
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return -EINVAL;
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}
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/* rv = build_prop_list(tmp, bufsize - (tmp - buf), &proplist); */
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while (buf < end &&
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(buf = parse_next_property(buf, end, &name, &length, &value))) {
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struct property *last = prop;
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prop = new_property(name, length, value, last);
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if (!prop) {
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rv = -ENOMEM;
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prop = last;
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goto out;
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}
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}
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if (!buf) {
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rv = -EINVAL;
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goto out;
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}
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rv = pSeries_reconfig_add_node(path, prop);
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out:
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if (rv)
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release_prop_list(prop);
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return rv;
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}
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static int do_remove_node(char *buf)
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{
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struct device_node *node;
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int rv = -ENODEV;
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if ((node = of_find_node_by_path(buf)))
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rv = pSeries_reconfig_remove_node(node);
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of_node_put(node);
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return rv;
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}
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static char *parse_node(char *buf, size_t bufsize, struct device_node **npp)
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{
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char *handle_str;
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phandle handle;
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*npp = NULL;
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handle_str = buf;
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buf = strchr(buf, ' ');
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if (!buf)
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return NULL;
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*buf = '\0';
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buf++;
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handle = simple_strtoul(handle_str, NULL, 10);
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*npp = of_find_node_by_phandle(handle);
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return buf;
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}
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static int do_add_property(char *buf, size_t bufsize)
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{
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struct property *prop = NULL;
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struct device_node *np;
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unsigned char *value;
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char *name, *end;
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int length;
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end = buf + bufsize;
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buf = parse_node(buf, bufsize, &np);
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if (!np)
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return -ENODEV;
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if (parse_next_property(buf, end, &name, &length, &value) == NULL)
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return -EINVAL;
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prop = new_property(name, length, value, NULL);
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if (!prop)
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return -ENOMEM;
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prom_add_property(np, prop);
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return 0;
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}
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static int do_remove_property(char *buf, size_t bufsize)
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{
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struct device_node *np;
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char *tmp;
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struct property *prop;
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buf = parse_node(buf, bufsize, &np);
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if (!np)
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return -ENODEV;
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tmp = strchr(buf,' ');
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if (tmp)
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*tmp = '\0';
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if (strlen(buf) == 0)
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return -EINVAL;
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prop = of_find_property(np, buf, NULL);
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return prom_remove_property(np, prop);
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}
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static int do_update_property(char *buf, size_t bufsize)
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{
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struct device_node *np;
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unsigned char *value;
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char *name, *end;
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int length;
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struct property *newprop, *oldprop;
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buf = parse_node(buf, bufsize, &np);
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end = buf + bufsize;
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if (!np)
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return -ENODEV;
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if (parse_next_property(buf, end, &name, &length, &value) == NULL)
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return -EINVAL;
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newprop = new_property(name, length, value, NULL);
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if (!newprop)
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return -ENOMEM;
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oldprop = of_find_property(np, name,NULL);
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if (!oldprop)
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return -ENODEV;
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return prom_update_property(np, newprop, oldprop);
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}
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/**
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* ofdt_write - perform operations on the Open Firmware device tree
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*
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* @file: not used
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* @buf: command and arguments
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* @count: size of the command buffer
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* @off: not used
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*
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* Operations supported at this time are addition and removal of
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* whole nodes along with their properties. Operations on individual
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* properties are not implemented (yet).
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*/
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static ssize_t ofdt_write(struct file *file, const char __user *buf, size_t count,
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loff_t *off)
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{
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int rv = 0;
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char *kbuf;
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char *tmp;
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if (!(kbuf = kmalloc(count + 1, GFP_KERNEL))) {
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rv = -ENOMEM;
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goto out;
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}
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if (copy_from_user(kbuf, buf, count)) {
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rv = -EFAULT;
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goto out;
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}
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kbuf[count] = '\0';
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tmp = strchr(kbuf, ' ');
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if (!tmp) {
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rv = -EINVAL;
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goto out;
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}
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*tmp = '\0';
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tmp++;
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if (!strcmp(kbuf, "add_node"))
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rv = do_add_node(tmp, count - (tmp - kbuf));
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else if (!strcmp(kbuf, "remove_node"))
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rv = do_remove_node(tmp);
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else if (!strcmp(kbuf, "add_property"))
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rv = do_add_property(tmp, count - (tmp - kbuf));
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else if (!strcmp(kbuf, "remove_property"))
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rv = do_remove_property(tmp, count - (tmp - kbuf));
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else if (!strcmp(kbuf, "update_property"))
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rv = do_update_property(tmp, count - (tmp - kbuf));
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else
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rv = -EINVAL;
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out:
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kfree(kbuf);
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return rv ? rv : count;
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}
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static struct file_operations ofdt_fops = {
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.write = ofdt_write
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};
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/* create /proc/ppc64/ofdt write-only by root */
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static int proc_ppc64_create_ofdt(void)
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{
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struct proc_dir_entry *ent;
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if (!platform_is_pseries())
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return 0;
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ent = create_proc_entry("ppc64/ofdt", S_IWUSR, NULL);
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if (ent) {
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ent->nlink = 1;
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ent->data = NULL;
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ent->size = 0;
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ent->proc_fops = &ofdt_fops;
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}
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return 0;
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}
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__initcall(proc_ppc64_create_ofdt);
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