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>
21 #include <asm/machdep.h>
25 static struct kobject *mobility_kobj;
27 struct update_props_workarea {
34 #define NODE_ACTION_MASK 0xff000000
35 #define NODE_COUNT_MASK 0x00ffffff
37 #define DELETE_DT_NODE 0x01000000
38 #define UPDATE_DT_NODE 0x02000000
39 #define ADD_DT_NODE 0x03000000
41 #define MIGRATION_SCOPE (1)
43 static int mobility_rtas_call(int token, char *buf, s32 scope)
47 spin_lock(&rtas_data_buf_lock);
49 memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
50 rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, scope);
51 memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
53 spin_unlock(&rtas_data_buf_lock);
57 static int delete_dt_node(u32 phandle)
59 struct device_node *dn;
61 dn = of_find_node_by_phandle(phandle);
65 dlpar_detach_node(dn);
70 static int update_dt_property(struct device_node *dn, struct property **prop,
71 const char *name, u32 vd, char *value)
73 struct property *new_prop = *prop;
76 /* A negative 'vd' value indicates that only part of the new property
77 * value is contained in the buffer and we need to call
78 * ibm,update-properties again to get the rest of the value.
80 * A negative value is also the two's compliment of the actual value.
82 if (vd & 0x80000000) {
88 /* partial property fixup */
89 char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL);
93 memcpy(new_data, new_prop->value, new_prop->length);
94 memcpy(new_data + new_prop->length, value, vd);
96 kfree(new_prop->value);
97 new_prop->value = new_data;
98 new_prop->length += vd;
100 new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
104 new_prop->name = kstrdup(name, GFP_KERNEL);
105 if (!new_prop->name) {
110 new_prop->length = vd;
111 new_prop->value = kzalloc(new_prop->length, GFP_KERNEL);
112 if (!new_prop->value) {
113 kfree(new_prop->name);
118 memcpy(new_prop->value, value, vd);
123 of_update_property(dn, new_prop);
130 static int update_dt_node(u32 phandle, s32 scope)
132 struct update_props_workarea *upwa;
133 struct device_node *dn;
134 struct property *prop = NULL;
138 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 rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf,
164 prop_data = rtas_buf + sizeof(*upwa);
166 /* On the first call to ibm,update-properties for a node the
167 * the first property value descriptor contains an empty
168 * property name, the property value length encoded as u32,
169 * and the property value is the node path being updated.
171 if (*prop_data == 0) {
173 vd = *(u32 *)prop_data;
174 prop_data += vd + sizeof(vd);
178 for (i = 0; i < upwa->nprops; i++) {
181 prop_name = prop_data;
182 prop_data += strlen(prop_name) + 1;
183 vd = *(u32 *)prop_data;
184 prop_data += sizeof(vd);
188 /* name only property, nothing to do */
192 prop = of_find_property(dn, prop_name, NULL);
193 of_remove_property(dn, prop);
198 rc = update_dt_property(dn, &prop, prop_name,
201 printk(KERN_ERR "Could not update %s"
202 " property\n", prop_name);
208 } while (rtas_rc == 1);
215 static int add_dt_node(u32 parent_phandle, u32 drc_index)
217 struct device_node *dn;
218 struct device_node *parent_dn;
221 parent_dn = of_find_node_by_phandle(parent_phandle);
225 dn = dlpar_configure_connector(drc_index, 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 activate_fw_token = rtas_token("ibm,activate-firmware");
295 if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
296 printk(KERN_ERR "Could not make post-mobility "
297 "activate-fw call.\n");
302 rc = rtas_call(activate_fw_token, 0, 1, NULL);
303 } while (rtas_busy_delay(rc));
306 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc);
308 rc = pseries_devicetree_update(MIGRATION_SCOPE);
310 printk(KERN_ERR "Post-mobility device tree update "
316 static ssize_t migrate_store(struct class *class, struct class_attribute *attr,
317 const char *buf, size_t count)
319 struct rtas_args args;
323 rc = kstrtou64(buf, 0, &streamid);
327 memset(&args, 0, sizeof(args));
328 args.token = rtas_token("ibm,suspend-me");
332 args.args[0] = streamid >> 32 ;
333 args.args[1] = streamid & 0xffffffff;
334 args.rets = &args.args[args.nargs];
338 rc = rtas_ibm_suspend_me(&args);
339 if (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE)
341 } while (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE);
345 else if (args.rets[0])
348 post_mobility_fixup();
352 static CLASS_ATTR(migration, S_IWUSR, NULL, migrate_store);
354 static int __init mobility_sysfs_init(void)
358 mobility_kobj = kobject_create_and_add("mobility", kernel_kobj);
362 rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr);
366 machine_device_initcall(pseries, mobility_sysfs_init);