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 #define MIGRATION_SCOPE (1)
42 static int mobility_rtas_call(int token, char *buf, s32 scope)
46 spin_lock(&rtas_data_buf_lock);
48 memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
49 rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, scope);
50 memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
52 spin_unlock(&rtas_data_buf_lock);
56 static int delete_dt_node(u32 phandle)
58 struct device_node *dn;
60 dn = of_find_node_by_phandle(phandle);
64 dlpar_detach_node(dn);
68 static int update_dt_property(struct device_node *dn, struct property **prop,
69 const char *name, u32 vd, char *value)
71 struct property *new_prop = *prop;
74 /* A negative 'vd' value indicates that only part of the new property
75 * value is contained in the buffer and we need to call
76 * ibm,update-properties again to get the rest of the value.
78 * A negative value is also the two's compliment of the actual value.
80 if (vd & 0x80000000) {
86 /* partial property fixup */
87 char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL);
91 memcpy(new_data, new_prop->value, new_prop->length);
92 memcpy(new_data + new_prop->length, value, vd);
94 kfree(new_prop->value);
95 new_prop->value = new_data;
96 new_prop->length += vd;
98 new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
102 new_prop->name = kstrdup(name, GFP_KERNEL);
103 if (!new_prop->name) {
108 new_prop->length = vd;
109 new_prop->value = kzalloc(new_prop->length, GFP_KERNEL);
110 if (!new_prop->value) {
111 kfree(new_prop->name);
116 memcpy(new_prop->value, value, vd);
121 of_update_property(dn, new_prop);
128 static int update_dt_node(u32 phandle, s32 scope)
130 struct update_props_workarea *upwa;
131 struct device_node *dn;
132 struct property *prop = NULL;
136 int update_properties_token;
139 update_properties_token = rtas_token("ibm,update-properties");
140 if (update_properties_token == RTAS_UNKNOWN_SERVICE)
143 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
147 dn = of_find_node_by_phandle(phandle);
153 upwa = (struct update_props_workarea *)&rtas_buf[0];
154 upwa->phandle = phandle;
157 rc = mobility_rtas_call(update_properties_token, rtas_buf,
162 prop_data = rtas_buf + sizeof(*upwa);
164 /* The first element of the buffer is the path of the node
165 * being updated in the form of a 8 byte string length
166 * followed by the string. Skip past this to get to the
167 * properties being updated.
172 /* The path we skipped over is counted as one of the elements
173 * returned so start counting at one.
175 for (i = 1; i < upwa->nprops; i++) {
178 prop_name = prop_data;
179 prop_data += strlen(prop_name) + 1;
180 vd = *(u32 *)prop_data;
181 prop_data += sizeof(vd);
185 /* name only property, nothing to do */
189 prop = of_find_property(dn, prop_name, NULL);
190 of_remove_property(dn, prop);
195 rc = update_dt_property(dn, &prop, prop_name,
198 printk(KERN_ERR "Could not update %s"
199 " property\n", prop_name);
212 static int add_dt_node(u32 parent_phandle, u32 drc_index)
214 struct device_node *dn;
215 struct device_node *parent_dn;
218 dn = dlpar_configure_connector(drc_index);
222 parent_dn = of_find_node_by_phandle(parent_phandle);
224 dlpar_free_cc_nodes(dn);
228 dn->parent = parent_dn;
229 rc = dlpar_attach_node(dn);
231 dlpar_free_cc_nodes(dn);
233 of_node_put(parent_dn);
237 int pseries_devicetree_update(s32 scope)
241 int update_nodes_token;
244 update_nodes_token = rtas_token("ibm,update-nodes");
245 if (update_nodes_token == RTAS_UNKNOWN_SERVICE)
248 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
253 rc = mobility_rtas_call(update_nodes_token, rtas_buf, scope);
257 data = (u32 *)rtas_buf + 4;
258 while (*data & NODE_ACTION_MASK) {
260 u32 action = *data & NODE_ACTION_MASK;
261 int node_count = *data & NODE_COUNT_MASK;
265 for (i = 0; i < node_count; i++) {
266 u32 phandle = *data++;
271 delete_dt_node(phandle);
274 update_dt_node(phandle, scope);
278 add_dt_node(phandle, drc_index);
289 void post_mobility_fixup(void)
292 int activate_fw_token;
294 rc = pseries_devicetree_update(MIGRATION_SCOPE);
296 printk(KERN_ERR "Initial post-mobility device tree update "
301 activate_fw_token = rtas_token("ibm,activate-firmware");
302 if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
303 printk(KERN_ERR "Could not make post-mobility "
304 "activate-fw call.\n");
308 rc = rtas_call(activate_fw_token, 0, 1, NULL);
310 rc = pseries_devicetree_update(MIGRATION_SCOPE);
312 printk(KERN_ERR "Secondary post-mobility device tree "
313 "update failed: %d\n", rc);
315 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc);
322 static ssize_t migrate_store(struct class *class, struct class_attribute *attr,
323 const char *buf, size_t count)
325 struct rtas_args args;
329 rc = strict_strtoull(buf, 0, &streamid);
333 memset(&args, 0, sizeof(args));
334 args.token = rtas_token("ibm,suspend-me");
338 args.args[0] = streamid >> 32 ;
339 args.args[1] = streamid & 0xffffffff;
340 args.rets = &args.args[args.nargs];
344 rc = rtas_ibm_suspend_me(&args);
345 if (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE)
347 } while (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE);
351 else if (args.rets[0])
354 post_mobility_fixup();
358 static CLASS_ATTR(migration, S_IWUSR, NULL, migrate_store);
360 static int __init mobility_sysfs_init(void)
364 mobility_kobj = kobject_create_and_add("mobility", kernel_kobj);
368 rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr);
372 device_initcall(mobility_sysfs_init);