2 * Support for Partition Mobility/Migration
4 * Copyright (C) 2010 Nathan Fontenot
5 * Copyright (C) 2010 IBM Corporation
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version
9 * 2 as published by the Free Software Foundation.
12 #include <linux/kernel.h>
13 #include <linux/kobject.h>
14 #include <linux/smp.h>
15 #include <linux/completion.h>
16 #include <linux/device.h>
17 #include <linux/delay.h>
18 #include <linux/slab.h>
23 static struct kobject *mobility_kobj;
25 struct update_props_workarea {
32 #define NODE_ACTION_MASK 0xff000000
33 #define NODE_COUNT_MASK 0x00ffffff
35 #define DELETE_DT_NODE 0x01000000
36 #define UPDATE_DT_NODE 0x02000000
37 #define ADD_DT_NODE 0x03000000
39 static int mobility_rtas_call(int token, char *buf)
43 spin_lock(&rtas_data_buf_lock);
45 memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
46 rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, 1);
47 memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
49 spin_unlock(&rtas_data_buf_lock);
53 static int delete_dt_node(u32 phandle)
55 struct device_node *dn;
57 dn = of_find_node_by_phandle(phandle);
61 dlpar_detach_node(dn);
65 static int update_dt_property(struct device_node *dn, struct property **prop,
66 const char *name, u32 vd, char *value)
68 struct property *new_prop = *prop;
69 struct property *old_prop;
72 /* A negative 'vd' value indicates that only part of the new property
73 * value is contained in the buffer and we need to call
74 * ibm,update-properties again to get the rest of the value.
76 * A negative value is also the two's compliment of the actual value.
78 if (vd & 0x80000000) {
84 /* partial property fixup */
85 char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL);
89 memcpy(new_data, new_prop->value, new_prop->length);
90 memcpy(new_data + new_prop->length, value, vd);
92 kfree(new_prop->value);
93 new_prop->value = new_data;
94 new_prop->length += vd;
96 new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
100 new_prop->name = kstrdup(name, GFP_KERNEL);
101 if (!new_prop->name) {
106 new_prop->length = vd;
107 new_prop->value = kzalloc(new_prop->length, GFP_KERNEL);
108 if (!new_prop->value) {
109 kfree(new_prop->name);
114 memcpy(new_prop->value, value, vd);
119 old_prop = of_find_property(dn, new_prop->name, NULL);
121 prom_update_property(dn, new_prop, old_prop);
123 prom_add_property(dn, new_prop);
131 static int update_dt_node(u32 phandle)
133 struct update_props_workarea *upwa;
134 struct device_node *dn;
135 struct property *prop = NULL;
139 int update_properties_token;
141 update_properties_token = rtas_token("ibm,update-properties");
142 if (update_properties_token == RTAS_UNKNOWN_SERVICE)
145 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
149 dn = of_find_node_by_phandle(phandle);
155 upwa = (struct update_props_workarea *)&rtas_buf[0];
156 upwa->phandle = phandle;
159 rc = mobility_rtas_call(update_properties_token, rtas_buf);
163 prop_data = rtas_buf + sizeof(*upwa);
165 for (i = 0; i < upwa->nprops; i++) {
169 prop_name = prop_data + 1;
170 prop_data += strlen(prop_name) + 1;
175 /* name only property, nothing to do */
179 prop = of_find_property(dn, prop_name, NULL);
180 prom_remove_property(dn, prop);
185 rc = update_dt_property(dn, &prop, prop_name,
188 printk(KERN_ERR "Could not update %s"
189 " property\n", prop_name);
202 static int add_dt_node(u32 parent_phandle, u32 drc_index)
204 struct device_node *dn;
205 struct device_node *parent_dn;
208 dn = dlpar_configure_connector(drc_index);
212 parent_dn = of_find_node_by_phandle(parent_phandle);
214 dlpar_free_cc_nodes(dn);
218 dn->parent = parent_dn;
219 rc = dlpar_attach_node(dn);
221 dlpar_free_cc_nodes(dn);
223 of_node_put(parent_dn);
227 static int pseries_devicetree_update(void)
231 int update_nodes_token;
234 update_nodes_token = rtas_token("ibm,update-nodes");
235 if (update_nodes_token == RTAS_UNKNOWN_SERVICE)
238 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
243 rc = mobility_rtas_call(update_nodes_token, rtas_buf);
247 data = (u32 *)rtas_buf + 4;
248 while (*data & NODE_ACTION_MASK) {
250 u32 action = *data & NODE_ACTION_MASK;
251 int node_count = *data & NODE_COUNT_MASK;
255 for (i = 0; i < node_count; i++) {
256 u32 phandle = *data++;
261 delete_dt_node(phandle);
264 update_dt_node(phandle);
268 add_dt_node(phandle, drc_index);
279 void post_mobility_fixup(void)
282 int activate_fw_token;
284 rc = pseries_devicetree_update();
286 printk(KERN_ERR "Initial post-mobility device tree update "
291 activate_fw_token = rtas_token("ibm,activate-firmware");
292 if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
293 printk(KERN_ERR "Could not make post-mobility "
294 "activate-fw call.\n");
298 rc = rtas_call(activate_fw_token, 0, 1, NULL);
300 rc = pseries_devicetree_update();
302 printk(KERN_ERR "Secondary post-mobility device tree "
303 "update failed: %d\n", rc);
305 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc);
312 static ssize_t migrate_store(struct class *class, struct class_attribute *attr,
313 const char *buf, size_t count)
315 struct rtas_args args;
319 rc = strict_strtoull(buf, 0, &streamid);
323 memset(&args, 0, sizeof(args));
324 args.token = rtas_token("ibm,suspend-me");
328 args.args[0] = streamid >> 32 ;
329 args.args[1] = streamid & 0xffffffff;
330 args.rets = &args.args[args.nargs];
334 rc = rtas_ibm_suspend_me(&args);
335 if (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE)
337 } while (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE);
341 else if (args.rets[0])
344 post_mobility_fixup();
348 static CLASS_ATTR(migration, S_IWUSR, NULL, migrate_store);
350 static int __init mobility_sysfs_init(void)
354 mobility_kobj = kobject_create_and_add("mobility", kernel_kobj);
358 rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr);
362 device_initcall(mobility_sysfs_init);