forked from Minki/linux
8e83e9053f
A lot of the code in platforms/pseries is using non-machine initcalls. That means if a kernel built with pseries support runs on another platform, for example powernv, the initcalls will still run. Most of these cases are OK, though sometimes only due to luck. Some were having more effect: * hcall_inst_init - Checking FW_FEATURE_LPAR which is set on ps3 & celleb. * mobility_sysfs_init - created sysfs files unconditionally - but no effect due to ENOSYS from rtas_ibm_suspend_me() * apo_pm_init - created sysfs, allows write - nothing checks the value written to though * alloc_dispatch_log_kmem_cache - creating kmem_cache on non-pseries machines Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
456 lines
9.7 KiB
C
456 lines
9.7 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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/**
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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 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 = 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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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/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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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 of_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, *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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