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-rw-r--r--arch/powerpc/platforms/pseries/reconfig.c564
1 files changed, 564 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/reconfig.c b/arch/powerpc/platforms/pseries/reconfig.c
new file mode 100644
index 00000000000..168651acdd8
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/reconfig.c
@@ -0,0 +1,564 @@
+/*
+ * pSeries_reconfig.c - support for dynamic reconfiguration (including PCI
+ * Hotplug and Dynamic Logical Partitioning on RPA platforms).
+ *
+ * Copyright (C) 2005 Nathan Lynch
+ * Copyright (C) 2005 IBM Corporation
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/notifier.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+
+#include <asm/prom.h>
+#include <asm/machdep.h>
+#include <asm/uaccess.h>
+#include <asm/pSeries_reconfig.h>
+#include <asm/mmu.h>
+
+
+
+/*
+ * Routines for "runtime" addition and removal of device tree nodes.
+ */
+#ifdef CONFIG_PROC_DEVICETREE
+/*
+ * Add a node to /proc/device-tree.
+ */
+static void add_node_proc_entries(struct device_node *np)
+{
+ struct proc_dir_entry *ent;
+
+ ent = proc_mkdir(strrchr(np->full_name, '/') + 1, np->parent->pde);
+ if (ent)
+ proc_device_tree_add_node(np, ent);
+}
+
+static void remove_node_proc_entries(struct device_node *np)
+{
+ struct property *pp = np->properties;
+ struct device_node *parent = np->parent;
+
+ while (pp) {
+ remove_proc_entry(pp->name, np->pde);
+ pp = pp->next;
+ }
+ if (np->pde)
+ remove_proc_entry(np->pde->name, parent->pde);
+}
+#else /* !CONFIG_PROC_DEVICETREE */
+static void add_node_proc_entries(struct device_node *np)
+{
+ return;
+}
+
+static void remove_node_proc_entries(struct device_node *np)
+{
+ return;
+}
+#endif /* CONFIG_PROC_DEVICETREE */
+
+/**
+ * derive_parent - basically like dirname(1)
+ * @path: the full_name of a node to be added to the tree
+ *
+ * Returns the node which should be the parent of the node
+ * described by path. E.g., for path = "/foo/bar", returns
+ * the node with full_name = "/foo".
+ */
+static struct device_node *derive_parent(const char *path)
+{
+ struct device_node *parent = NULL;
+ char *parent_path = "/";
+ size_t parent_path_len = strrchr(path, '/') - path + 1;
+
+ /* reject if path is "/" */
+ if (!strcmp(path, "/"))
+ return ERR_PTR(-EINVAL);
+
+ if (strrchr(path, '/') != path) {
+ parent_path = kmalloc(parent_path_len, GFP_KERNEL);
+ if (!parent_path)
+ return ERR_PTR(-ENOMEM);
+ strlcpy(parent_path, path, parent_path_len);
+ }
+ parent = of_find_node_by_path(parent_path);
+ if (!parent)
+ return ERR_PTR(-EINVAL);
+ if (strcmp(parent_path, "/"))
+ kfree(parent_path);
+ return parent;
+}
+
+static BLOCKING_NOTIFIER_HEAD(pSeries_reconfig_chain);
+
+int pSeries_reconfig_notifier_register(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&pSeries_reconfig_chain, nb);
+}
+
+void pSeries_reconfig_notifier_unregister(struct notifier_block *nb)
+{
+ blocking_notifier_chain_unregister(&pSeries_reconfig_chain, nb);
+}
+
+int pSeries_reconfig_notify(unsigned long action, void *p)
+{
+ int err = blocking_notifier_call_chain(&pSeries_reconfig_chain,
+ action, p);
+
+ return notifier_to_errno(err);
+}
+
+static int pSeries_reconfig_add_node(const char *path, struct property *proplist)
+{
+ struct device_node *np;
+ int err = -ENOMEM;
+
+ np = kzalloc(sizeof(*np), GFP_KERNEL);
+ if (!np)
+ goto out_err;
+
+ np->full_name = kstrdup(path, GFP_KERNEL);
+ if (!np->full_name)
+ goto out_err;
+
+ np->properties = proplist;
+ of_node_set_flag(np, OF_DYNAMIC);
+ kref_init(&np->kref);
+
+ np->parent = derive_parent(path);
+ if (IS_ERR(np->parent)) {
+ err = PTR_ERR(np->parent);
+ goto out_err;
+ }
+
+ err = pSeries_reconfig_notify(PSERIES_RECONFIG_ADD, np);
+ if (err) {
+ printk(KERN_ERR "Failed to add device node %s\n", path);
+ goto out_err;
+ }
+
+ of_attach_node(np);
+
+ add_node_proc_entries(np);
+
+ of_node_put(np->parent);
+
+ return 0;
+
+out_err:
+ if (np) {
+ of_node_put(np->parent);
+ kfree(np->full_name);
+ kfree(np);
+ }
+ return err;
+}
+
+static int pSeries_reconfig_remove_node(struct device_node *np)
+{
+ struct device_node *parent, *child;
+
+ parent = of_get_parent(np);
+ if (!parent)
+ return -EINVAL;
+
+ if ((child = of_get_next_child(np, NULL))) {
+ of_node_put(child);
+ of_node_put(parent);
+ return -EBUSY;
+ }
+
+ remove_node_proc_entries(np);
+
+ pSeries_reconfig_notify(PSERIES_RECONFIG_REMOVE, np);
+ of_detach_node(np);
+
+ of_node_put(parent);
+ of_node_put(np); /* Must decrement the refcount */
+ return 0;
+}
+
+/*
+ * /proc/powerpc/ofdt - yucky binary interface for adding and removing
+ * OF device nodes. Should be deprecated as soon as we get an
+ * in-kernel wrapper for the RTAS ibm,configure-connector call.
+ */
+
+static void release_prop_list(const struct property *prop)
+{
+ struct property *next;
+ for (; prop; prop = next) {
+ next = prop->next;
+ kfree(prop->name);
+ kfree(prop->value);
+ kfree(prop);
+ }
+
+}
+
+/**
+ * parse_next_property - process the next property from raw input buffer
+ * @buf: input buffer, must be nul-terminated
+ * @end: end of the input buffer + 1, for validation
+ * @name: return value; set to property name in buf
+ * @length: return value; set to length of value
+ * @value: return value; set to the property value in buf
+ *
+ * Note that the caller must make copies of the name and value returned,
+ * this function does no allocation or copying of the data. Return value
+ * is set to the next name in buf, or NULL on error.
+ */
+static char * parse_next_property(char *buf, char *end, char **name, int *length,
+ unsigned char **value)
+{
+ char *tmp;
+
+ *name = buf;
+
+ tmp = strchr(buf, ' ');
+ if (!tmp) {
+ printk(KERN_ERR "property parse failed in %s at line %d\n",
+ __func__, __LINE__);
+ return NULL;
+ }
+ *tmp = '\0';
+
+ if (++tmp >= end) {
+ printk(KERN_ERR "property parse failed in %s at line %d\n",
+ __func__, __LINE__);
+ return NULL;
+ }
+
+ /* now we're on the length */
+ *length = -1;
+ *length = simple_strtoul(tmp, &tmp, 10);
+ if (*length == -1) {
+ printk(KERN_ERR "property parse failed in %s at line %d\n",
+ __func__, __LINE__);
+ return NULL;
+ }
+ if (*tmp != ' ' || ++tmp >= end) {
+ printk(KERN_ERR "property parse failed in %s at line %d\n",
+ __func__, __LINE__);
+ return NULL;
+ }
+
+ /* now we're on the value */
+ *value = tmp;
+ tmp += *length;
+ if (tmp > end) {
+ printk(KERN_ERR "property parse failed in %s at line %d\n",
+ __func__, __LINE__);
+ return NULL;
+ }
+ else if (tmp < end && *tmp != ' ' && *tmp != '\0') {
+ printk(KERN_ERR "property parse failed in %s at line %d\n",
+ __func__, __LINE__);
+ return NULL;
+ }
+ tmp++;
+
+ /* and now we should be on the next name, or the end */
+ return tmp;
+}
+
+static struct property *new_property(const char *name, const int length,
+ const unsigned char *value, struct property *last)
+{
+ struct property *new = kzalloc(sizeof(*new), GFP_KERNEL);
+
+ if (!new)
+ return NULL;
+
+ if (!(new->name = kmalloc(strlen(name) + 1, GFP_KERNEL)))
+ goto cleanup;
+ if (!(new->value = kmalloc(length + 1, GFP_KERNEL)))
+ goto cleanup;
+
+ strcpy(new->name, name);
+ memcpy(new->value, value, length);
+ *(((char *)new->value) + length) = 0;
+ new->length = length;
+ new->next = last;
+ return new;
+
+cleanup:
+ kfree(new->name);
+ kfree(new->value);
+ kfree(new);
+ return NULL;
+}
+
+static int do_add_node(char *buf, size_t bufsize)
+{
+ char *path, *end, *name;
+ struct device_node *np;
+ struct property *prop = NULL;
+ unsigned char* value;
+ int length, rv = 0;
+
+ end = buf + bufsize;
+ path = buf;
+ buf = strchr(buf, ' ');
+ if (!buf)
+ return -EINVAL;
+ *buf = '\0';
+ buf++;
+
+ if ((np = of_find_node_by_path(path))) {
+ of_node_put(np);
+ return -EINVAL;
+ }
+
+ /* rv = build_prop_list(tmp, bufsize - (tmp - buf), &proplist); */
+ while (buf < end &&
+ (buf = parse_next_property(buf, end, &name, &length, &value))) {
+ struct property *last = prop;
+
+ prop = new_property(name, length, value, last);
+ if (!prop) {
+ rv = -ENOMEM;
+ prop = last;
+ goto out;
+ }
+ }
+ if (!buf) {
+ rv = -EINVAL;
+ goto out;
+ }
+
+ rv = pSeries_reconfig_add_node(path, prop);
+
+out:
+ if (rv)
+ release_prop_list(prop);
+ return rv;
+}
+
+static int do_remove_node(char *buf)
+{
+ struct device_node *node;
+ int rv = -ENODEV;
+
+ if ((node = of_find_node_by_path(buf)))
+ rv = pSeries_reconfig_remove_node(node);
+
+ of_node_put(node);
+ return rv;
+}
+
+static char *parse_node(char *buf, size_t bufsize, struct device_node **npp)
+{
+ char *handle_str;
+ phandle handle;
+ *npp = NULL;
+
+ handle_str = buf;
+
+ buf = strchr(buf, ' ');
+ if (!buf)
+ return NULL;
+ *buf = '\0';
+ buf++;
+
+ handle = simple_strtoul(handle_str, NULL, 0);
+
+ *npp = of_find_node_by_phandle(handle);
+ return buf;
+}
+
+static int do_add_property(char *buf, size_t bufsize)
+{
+ struct property *prop = NULL;
+ struct device_node *np;
+ unsigned char *value;
+ char *name, *end;
+ int length;
+ end = buf + bufsize;
+ buf = parse_node(buf, bufsize, &np);
+
+ if (!np)
+ return -ENODEV;
+
+ if (parse_next_property(buf, end, &name, &length, &value) == NULL)
+ return -EINVAL;
+
+ prop = new_property(name, length, value, NULL);
+ if (!prop)
+ return -ENOMEM;
+
+ prom_add_property(np, prop);
+
+ return 0;
+}
+
+static int do_remove_property(char *buf, size_t bufsize)
+{
+ struct device_node *np;
+ char *tmp;
+ struct property *prop;
+ buf = parse_node(buf, bufsize, &np);
+
+ if (!np)
+ return -ENODEV;
+
+ tmp = strchr(buf,' ');
+ if (tmp)
+ *tmp = '\0';
+
+ if (strlen(buf) == 0)
+ return -EINVAL;
+
+ prop = of_find_property(np, buf, NULL);
+
+ return prom_remove_property(np, prop);
+}
+
+static int do_update_property(char *buf, size_t bufsize)
+{
+ struct device_node *np;
+ unsigned char *value;
+ char *name, *end, *next_prop;
+ int rc, length;
+ struct property *newprop, *oldprop;
+ buf = parse_node(buf, bufsize, &np);
+ end = buf + bufsize;
+
+ if (!np)
+ return -ENODEV;
+
+ next_prop = parse_next_property(buf, end, &name, &length, &value);
+ if (!next_prop)
+ return -EINVAL;
+
+ newprop = new_property(name, length, value, NULL);
+ if (!newprop)
+ return -ENOMEM;
+
+ if (!strcmp(name, "slb-size") || !strcmp(name, "ibm,slb-size"))
+ slb_set_size(*(int *)value);
+
+ oldprop = of_find_property(np, name,NULL);
+ if (!oldprop) {
+ if (strlen(name))
+ return prom_add_property(np, newprop);
+ return -ENODEV;
+ }
+
+ rc = prom_update_property(np, newprop, oldprop);
+ if (rc)
+ return rc;
+
+ /* For memory under the ibm,dynamic-reconfiguration-memory node
+ * of the device tree, adding and removing memory is just an update
+ * to the ibm,dynamic-memory property instead of adding/removing a
+ * memory node in the device tree. For these cases we still need to
+ * involve the notifier chain.
+ */
+ if (!strcmp(name, "ibm,dynamic-memory")) {
+ int action;
+
+ next_prop = parse_next_property(next_prop, end, &name,
+ &length, &value);
+ if (!next_prop)
+ return -EINVAL;
+
+ if (!strcmp(name, "add"))
+ action = PSERIES_DRCONF_MEM_ADD;
+ else
+ action = PSERIES_DRCONF_MEM_REMOVE;
+
+ rc = pSeries_reconfig_notify(action, value);
+ if (rc) {
+ prom_update_property(np, oldprop, newprop);
+ return rc;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * ofdt_write - perform operations on the Open Firmware device tree
+ *
+ * @file: not used
+ * @buf: command and arguments
+ * @count: size of the command buffer
+ * @off: not used
+ *
+ * Operations supported at this time are addition and removal of
+ * whole nodes along with their properties. Operations on individual
+ * properties are not implemented (yet).
+ */
+static ssize_t ofdt_write(struct file *file, const char __user *buf, size_t count,
+ loff_t *off)
+{
+ int rv = 0;
+ char *kbuf;
+ char *tmp;
+
+ if (!(kbuf = kmalloc(count + 1, GFP_KERNEL))) {
+ rv = -ENOMEM;
+ goto out;
+ }
+ if (copy_from_user(kbuf, buf, count)) {
+ rv = -EFAULT;
+ goto out;
+ }
+
+ kbuf[count] = '\0';
+
+ tmp = strchr(kbuf, ' ');
+ if (!tmp) {
+ rv = -EINVAL;
+ goto out;
+ }
+ *tmp = '\0';
+ tmp++;
+
+ if (!strcmp(kbuf, "add_node"))
+ rv = do_add_node(tmp, count - (tmp - kbuf));
+ else if (!strcmp(kbuf, "remove_node"))
+ rv = do_remove_node(tmp);
+ else if (!strcmp(kbuf, "add_property"))
+ rv = do_add_property(tmp, count - (tmp - kbuf));
+ else if (!strcmp(kbuf, "remove_property"))
+ rv = do_remove_property(tmp, count - (tmp - kbuf));
+ else if (!strcmp(kbuf, "update_property"))
+ rv = do_update_property(tmp, count - (tmp - kbuf));
+ else
+ rv = -EINVAL;
+out:
+ kfree(kbuf);
+ return rv ? rv : count;
+}
+
+static const struct file_operations ofdt_fops = {
+ .write = ofdt_write,
+ .llseek = noop_llseek,
+};
+
+/* create /proc/powerpc/ofdt write-only by root */
+static int proc_ppc64_create_ofdt(void)
+{
+ struct proc_dir_entry *ent;
+
+ if (!machine_is(pseries))
+ return 0;
+
+ ent = proc_create("powerpc/ofdt", S_IWUSR, NULL, &ofdt_fops);
+ if (ent)
+ ent->size = 0;
+
+ return 0;
+}
+__initcall(proc_ppc64_create_ofdt);