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)
44 static int mobility_rtas_call(int token, char *buf, s32 scope)
48 spin_lock(&rtas_data_buf_lock);
50 memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
51 rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, scope);
52 memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
54 spin_unlock(&rtas_data_buf_lock);
58 static int delete_dt_node(__be32 phandle)
60 struct device_node *dn;
62 dn = of_find_node_by_phandle(be32_to_cpu(phandle));
66 dlpar_detach_node(dn);
71 static int update_dt_property(struct device_node *dn, struct property **prop,
72 const char *name, u32 vd, char *value)
74 struct property *new_prop = *prop;
77 /* A negative 'vd' value indicates that only part of the new property
78 * value is contained in the buffer and we need to call
79 * ibm,update-properties again to get the rest of the value.
81 * A negative value is also the two's compliment of the actual value.
83 if (vd & 0x80000000) {
89 /* partial property fixup */
90 char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL);
94 memcpy(new_data, new_prop->value, new_prop->length);
95 memcpy(new_data + new_prop->length, value, vd);
97 kfree(new_prop->value);
98 new_prop->value = new_data;
99 new_prop->length += vd;
101 new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
105 new_prop->name = kstrdup(name, GFP_KERNEL);
106 if (!new_prop->name) {
111 new_prop->length = vd;
112 new_prop->value = kzalloc(new_prop->length, GFP_KERNEL);
113 if (!new_prop->value) {
114 kfree(new_prop->name);
119 memcpy(new_prop->value, value, vd);
124 of_update_property(dn, new_prop);
131 static int update_dt_node(__be32 phandle, s32 scope)
133 struct update_props_workarea *upwa;
134 struct device_node *dn;
135 struct property *prop = NULL;
139 int update_properties_token;
143 update_properties_token = rtas_token("ibm,update-properties");
144 if (update_properties_token == RTAS_UNKNOWN_SERVICE)
147 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
151 dn = of_find_node_by_phandle(be32_to_cpu(phandle));
157 upwa = (struct update_props_workarea *)&rtas_buf[0];
158 upwa->phandle = phandle;
161 rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf,
166 prop_data = rtas_buf + sizeof(*upwa);
167 nprops = be32_to_cpu(upwa->nprops);
169 /* On the first call to ibm,update-properties for a node the
170 * the first property value descriptor contains an empty
171 * property name, the property value length encoded as u32,
172 * and the property value is the node path being updated.
174 if (*prop_data == 0) {
176 vd = be32_to_cpu(*(__be32 *)prop_data);
177 prop_data += vd + sizeof(vd);
181 for (i = 0; i < nprops; i++) {
184 prop_name = prop_data;
185 prop_data += strlen(prop_name) + 1;
186 vd = be32_to_cpu(*(__be32 *)prop_data);
187 prop_data += sizeof(vd);
191 /* name only property, nothing to do */
195 of_remove_property(dn, of_find_property(dn,
201 rc = update_dt_property(dn, &prop, prop_name,
204 printk(KERN_ERR "Could not update %s"
205 " property\n", prop_name);
211 } while (rtas_rc == 1);
218 static int add_dt_node(__be32 parent_phandle, __be32 drc_index)
220 struct device_node *dn;
221 struct device_node *parent_dn;
224 parent_dn = of_find_node_by_phandle(be32_to_cpu(parent_phandle));
228 dn = dlpar_configure_connector(drc_index, parent_dn);
230 of_node_put(parent_dn);
234 rc = dlpar_attach_node(dn, parent_dn);
236 dlpar_free_cc_nodes(dn);
238 of_node_put(parent_dn);
242 static void prrn_update_node(__be32 phandle)
244 struct pseries_hp_errorlog *hp_elog;
245 struct device_node *dn;
248 * If a node is found from a the given phandle, the phandle does not
249 * represent the drc index of an LMB and we can ignore.
251 dn = of_find_node_by_phandle(be32_to_cpu(phandle));
257 hp_elog = kzalloc(sizeof(*hp_elog), GFP_KERNEL);
261 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
262 hp_elog->action = PSERIES_HP_ELOG_ACTION_READD;
263 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
264 hp_elog->_drc_u.drc_index = phandle;
266 queue_hotplug_event(hp_elog, NULL, NULL);
271 int pseries_devicetree_update(s32 scope)
275 int update_nodes_token;
278 update_nodes_token = rtas_token("ibm,update-nodes");
279 if (update_nodes_token == RTAS_UNKNOWN_SERVICE)
282 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
287 rc = mobility_rtas_call(update_nodes_token, rtas_buf, scope);
291 data = (__be32 *)rtas_buf + 4;
292 while (be32_to_cpu(*data) & NODE_ACTION_MASK) {
294 u32 action = be32_to_cpu(*data) & NODE_ACTION_MASK;
295 u32 node_count = be32_to_cpu(*data) & NODE_COUNT_MASK;
299 for (i = 0; i < node_count; i++) {
300 __be32 phandle = *data++;
305 delete_dt_node(phandle);
308 update_dt_node(phandle, scope);
310 if (scope == PRRN_SCOPE)
311 prrn_update_node(phandle);
316 add_dt_node(phandle, drc_index);
327 void post_mobility_fixup(void)
330 int activate_fw_token;
332 activate_fw_token = rtas_token("ibm,activate-firmware");
333 if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
334 printk(KERN_ERR "Could not make post-mobility "
335 "activate-fw call.\n");
340 rc = rtas_call(activate_fw_token, 0, 1, NULL);
341 } while (rtas_busy_delay(rc));
344 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc);
346 rc = pseries_devicetree_update(MIGRATION_SCOPE);
348 printk(KERN_ERR "Post-mobility device tree update "
354 static ssize_t migration_store(struct class *class,
355 struct class_attribute *attr, const char *buf,
361 rc = kstrtou64(buf, 0, &streamid);
366 rc = rtas_ibm_suspend_me(streamid);
369 } while (rc == -EAGAIN);
374 post_mobility_fixup();
379 * Used by drmgr to determine the kernel behavior of the migration interface.
381 * Version 1: Performs all PAPR requirements for migration including
382 * firmware activation and device tree update.
384 #define MIGRATION_API_VERSION 1
386 static CLASS_ATTR_WO(migration);
387 static CLASS_ATTR_STRING(api_version, 0444, __stringify(MIGRATION_API_VERSION));
389 static int __init mobility_sysfs_init(void)
393 mobility_kobj = kobject_create_and_add("mobility", kernel_kobj);
397 rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr);
399 pr_err("mobility: unable to create migration sysfs file (%d)\n", rc);
401 rc = sysfs_create_file(mobility_kobj, &class_attr_api_version.attr.attr);
403 pr_err("mobility: unable to create api_version sysfs file (%d)\n", rc);
407 machine_device_initcall(pseries, mobility_sysfs_init);