422 lines
8.8 KiB
C
422 lines
8.8 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/notifier.h>
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#include <linux/proc_fs.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <asm/prom.h>
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#include <asm/machdep.h>
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#include <asm/uaccess.h>
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#include <asm/mmu.h>
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#include "of_helpers.h"
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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 = kstrdup(path, GFP_KERNEL);
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if (!np->full_name)
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goto out_err;
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np->properties = proplist;
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of_node_set_flag(np, OF_DYNAMIC);
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of_node_init(np);
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np->parent = pseries_of_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 = of_attach_node(np);
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if (err) {
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printk(KERN_ERR "Failed to add device node %s\n", path);
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goto out_err;
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}
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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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of_node_put(parent);
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return -EBUSY;
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}
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of_detach_node(np);
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of_node_put(parent);
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return 0;
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}
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/*
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* /proc/powerpc/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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__func__, __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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__func__, __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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__func__, __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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__func__, __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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__func__, __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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__func__, __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 = kzalloc(sizeof(*new), GFP_KERNEL);
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if (!new)
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return NULL;
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if (!(new->name = kstrdup(name, 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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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, 0);
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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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of_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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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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return of_remove_property(np, of_find_property(np, buf, NULL));
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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, *next_prop;
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int length;
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struct property *newprop;
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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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next_prop = parse_next_property(buf, end, &name, &length, &value);
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if (!next_prop)
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return -EINVAL;
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if (!strlen(name))
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return -ENODEV;
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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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if (!strcmp(name, "slb-size") || !strcmp(name, "ibm,slb-size"))
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slb_set_size(*(int *)value);
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return of_update_property(np, newprop);
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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 const struct file_operations ofdt_fops = {
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.write = ofdt_write,
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.llseek = noop_llseek,
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};
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/* create /proc/powerpc/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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ent = proc_create("powerpc/ofdt", S_IWUSR, NULL, &ofdt_fops);
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if (ent)
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proc_set_size(ent, 0);
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return 0;
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}
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machine_device_initcall(pseries, proc_ppc64_create_ofdt);
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