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/stat.h>
16 #include <linux/completion.h>
17 #include <linux/device.h>
18 #include <linux/delay.h>
19 #include <linux/slab.h>
24 static struct kobject *mobility_kobj;
26 struct update_props_workarea {
33 #define NODE_ACTION_MASK 0xff000000
34 #define NODE_COUNT_MASK 0x00ffffff
36 #define DELETE_DT_NODE 0x01000000
37 #define UPDATE_DT_NODE 0x02000000
38 #define ADD_DT_NODE 0x03000000
40 static int mobility_rtas_call(int token, char *buf)
44 spin_lock(&rtas_data_buf_lock);
46 memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
47 rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, 1);
48 memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
50 spin_unlock(&rtas_data_buf_lock);
54 static int delete_dt_node(u32 phandle)
56 struct device_node *dn;
58 dn = of_find_node_by_phandle(phandle);
62 dlpar_detach_node(dn);
66 static int update_dt_property(struct device_node *dn, struct property **prop,
67 const char *name, u32 vd, char *value)
69 struct property *new_prop = *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 of_update_property(dn, new_prop);
126 static int update_dt_node(u32 phandle)
128 struct update_props_workarea *upwa;
129 struct device_node *dn;
130 struct property *prop = NULL;
134 int update_properties_token;
136 update_properties_token = rtas_token("ibm,update-properties");
137 if (update_properties_token == RTAS_UNKNOWN_SERVICE)
140 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
144 dn = of_find_node_by_phandle(phandle);
150 upwa = (struct update_props_workarea *)&rtas_buf[0];
151 upwa->phandle = phandle;
154 rc = mobility_rtas_call(update_properties_token, rtas_buf);
158 prop_data = rtas_buf + sizeof(*upwa);
160 for (i = 0; i < upwa->nprops; i++) {
164 prop_name = prop_data + 1;
165 prop_data += strlen(prop_name) + 1;
170 /* name only property, nothing to do */
174 prop = of_find_property(dn, prop_name, NULL);
175 of_remove_property(dn, prop);
180 rc = update_dt_property(dn, &prop, prop_name,
183 printk(KERN_ERR "Could not update %s"
184 " property\n", prop_name);
197 static int add_dt_node(u32 parent_phandle, u32 drc_index)
199 struct device_node *dn;
200 struct device_node *parent_dn;
203 dn = dlpar_configure_connector(drc_index);
207 parent_dn = of_find_node_by_phandle(parent_phandle);
209 dlpar_free_cc_nodes(dn);
213 dn->parent = parent_dn;
214 rc = dlpar_attach_node(dn);
216 dlpar_free_cc_nodes(dn);
218 of_node_put(parent_dn);
222 static int pseries_devicetree_update(void)
226 int update_nodes_token;
229 update_nodes_token = rtas_token("ibm,update-nodes");
230 if (update_nodes_token == RTAS_UNKNOWN_SERVICE)
233 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
238 rc = mobility_rtas_call(update_nodes_token, rtas_buf);
242 data = (u32 *)rtas_buf + 4;
243 while (*data & NODE_ACTION_MASK) {
245 u32 action = *data & NODE_ACTION_MASK;
246 int node_count = *data & NODE_COUNT_MASK;
250 for (i = 0; i < node_count; i++) {
251 u32 phandle = *data++;
256 delete_dt_node(phandle);
259 update_dt_node(phandle);
263 add_dt_node(phandle, drc_index);
274 void post_mobility_fixup(void)
277 int activate_fw_token;
279 rc = pseries_devicetree_update();
281 printk(KERN_ERR "Initial post-mobility device tree update "
286 activate_fw_token = rtas_token("ibm,activate-firmware");
287 if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
288 printk(KERN_ERR "Could not make post-mobility "
289 "activate-fw call.\n");
293 rc = rtas_call(activate_fw_token, 0, 1, NULL);
295 rc = pseries_devicetree_update();
297 printk(KERN_ERR "Secondary post-mobility device tree "
298 "update failed: %d\n", rc);
300 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc);
307 static ssize_t migrate_store(struct class *class, struct class_attribute *attr,
308 const char *buf, size_t count)
310 struct rtas_args args;
314 rc = strict_strtoull(buf, 0, &streamid);
318 memset(&args, 0, sizeof(args));
319 args.token = rtas_token("ibm,suspend-me");
323 args.args[0] = streamid >> 32 ;
324 args.args[1] = streamid & 0xffffffff;
325 args.rets = &args.args[args.nargs];
329 rc = rtas_ibm_suspend_me(&args);
330 if (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE)
332 } while (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE);
336 else if (args.rets[0])
339 post_mobility_fixup();
343 static CLASS_ATTR(migration, S_IWUSR, NULL, migrate_store);
345 static int __init mobility_sysfs_init(void)
349 mobility_kobj = kobject_create_and_add("mobility", kernel_kobj);
353 rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr);
357 device_initcall(mobility_sysfs_init);