1 /*
2 * Support for Partition Mobility/Migration
3 *
4 * Copyright (C) 2010 Nathan Fontenot
5 * Copyright (C) 2010 IBM Corporation
6 *
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.
10 */
11
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>
20 #include <linux/stringify.h>
21
22 #include <asm/machdep.h>
23 #include <asm/rtas.h>
24 #include "pseries.h"
25
26 static struct kobject *mobility_kobj;
27
28 struct update_props_workarea {
29 __be32 phandle;
30 __be32 state;
31 __be64 reserved;
32 __be32 nprops;
33 } __packed;
34
35 #define NODE_ACTION_MASK 0xff000000
36 #define NODE_COUNT_MASK 0x00ffffff
37
38 #define DELETE_DT_NODE 0x01000000
39 #define UPDATE_DT_NODE 0x02000000
40 #define ADD_DT_NODE 0x03000000
41
42 #define MIGRATION_SCOPE (1)
43 #define PRRN_SCOPE -2
44
mobility_rtas_call(int token,char * buf,s32 scope)45 static int mobility_rtas_call(int token, char *buf, s32 scope)
46 {
47 int rc;
48
49 spin_lock(&rtas_data_buf_lock);
50
51 memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
52 rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, scope);
53 memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
54
55 spin_unlock(&rtas_data_buf_lock);
56 return rc;
57 }
58
delete_dt_node(__be32 phandle)59 static int delete_dt_node(__be32 phandle)
60 {
61 struct device_node *dn;
62
63 dn = of_find_node_by_phandle(be32_to_cpu(phandle));
64 if (!dn)
65 return -ENOENT;
66
67 dlpar_detach_node(dn);
68 of_node_put(dn);
69 return 0;
70 }
71
update_dt_property(struct device_node * dn,struct property ** prop,const char * name,u32 vd,char * value)72 static int update_dt_property(struct device_node *dn, struct property **prop,
73 const char *name, u32 vd, char *value)
74 {
75 struct property *new_prop = *prop;
76 int more = 0;
77
78 /* A negative 'vd' value indicates that only part of the new property
79 * value is contained in the buffer and we need to call
80 * ibm,update-properties again to get the rest of the value.
81 *
82 * A negative value is also the two's compliment of the actual value.
83 */
84 if (vd & 0x80000000) {
85 vd = ~vd + 1;
86 more = 1;
87 }
88
89 if (new_prop) {
90 /* partial property fixup */
91 char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL);
92 if (!new_data)
93 return -ENOMEM;
94
95 memcpy(new_data, new_prop->value, new_prop->length);
96 memcpy(new_data + new_prop->length, value, vd);
97
98 kfree(new_prop->value);
99 new_prop->value = new_data;
100 new_prop->length += vd;
101 } else {
102 new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
103 if (!new_prop)
104 return -ENOMEM;
105
106 new_prop->name = kstrdup(name, GFP_KERNEL);
107 if (!new_prop->name) {
108 kfree(new_prop);
109 return -ENOMEM;
110 }
111
112 new_prop->length = vd;
113 new_prop->value = kzalloc(new_prop->length, GFP_KERNEL);
114 if (!new_prop->value) {
115 kfree(new_prop->name);
116 kfree(new_prop);
117 return -ENOMEM;
118 }
119
120 memcpy(new_prop->value, value, vd);
121 *prop = new_prop;
122 }
123
124 if (!more) {
125 of_update_property(dn, new_prop);
126 *prop = NULL;
127 }
128
129 return 0;
130 }
131
update_dt_node(__be32 phandle,s32 scope)132 static int update_dt_node(__be32 phandle, s32 scope)
133 {
134 struct update_props_workarea *upwa;
135 struct device_node *dn;
136 struct property *prop = NULL;
137 int i, rc, rtas_rc;
138 char *prop_data;
139 char *rtas_buf;
140 int update_properties_token;
141 u32 nprops;
142 u32 vd;
143
144 update_properties_token = rtas_token("ibm,update-properties");
145 if (update_properties_token == RTAS_UNKNOWN_SERVICE)
146 return -EINVAL;
147
148 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
149 if (!rtas_buf)
150 return -ENOMEM;
151
152 dn = of_find_node_by_phandle(be32_to_cpu(phandle));
153 if (!dn) {
154 kfree(rtas_buf);
155 return -ENOENT;
156 }
157
158 upwa = (struct update_props_workarea *)&rtas_buf[0];
159 upwa->phandle = phandle;
160
161 do {
162 rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf,
163 scope);
164 if (rtas_rc < 0)
165 break;
166
167 prop_data = rtas_buf + sizeof(*upwa);
168 nprops = be32_to_cpu(upwa->nprops);
169
170 /* On the first call to ibm,update-properties for a node the
171 * the first property value descriptor contains an empty
172 * property name, the property value length encoded as u32,
173 * and the property value is the node path being updated.
174 */
175 if (*prop_data == 0) {
176 prop_data++;
177 vd = be32_to_cpu(*(__be32 *)prop_data);
178 prop_data += vd + sizeof(vd);
179 nprops--;
180 }
181
182 for (i = 0; i < nprops; i++) {
183 char *prop_name;
184
185 prop_name = prop_data;
186 prop_data += strlen(prop_name) + 1;
187 vd = be32_to_cpu(*(__be32 *)prop_data);
188 prop_data += sizeof(vd);
189
190 switch (vd) {
191 case 0x00000000:
192 /* name only property, nothing to do */
193 break;
194
195 case 0x80000000:
196 of_remove_property(dn, of_find_property(dn,
197 prop_name, NULL));
198 prop = NULL;
199 break;
200
201 default:
202 rc = update_dt_property(dn, &prop, prop_name,
203 vd, prop_data);
204 if (rc) {
205 printk(KERN_ERR "Could not update %s"
206 " property\n", prop_name);
207 }
208
209 prop_data += vd;
210 }
211 }
212 } while (rtas_rc == 1);
213
214 of_node_put(dn);
215 kfree(rtas_buf);
216 return 0;
217 }
218
add_dt_node(__be32 parent_phandle,__be32 drc_index)219 static int add_dt_node(__be32 parent_phandle, __be32 drc_index)
220 {
221 struct device_node *dn;
222 struct device_node *parent_dn;
223 int rc;
224
225 parent_dn = of_find_node_by_phandle(be32_to_cpu(parent_phandle));
226 if (!parent_dn)
227 return -ENOENT;
228
229 dn = dlpar_configure_connector(drc_index, parent_dn);
230 if (!dn) {
231 of_node_put(parent_dn);
232 return -ENOENT;
233 }
234
235 rc = dlpar_attach_node(dn, parent_dn);
236 if (rc)
237 dlpar_free_cc_nodes(dn);
238
239 of_node_put(parent_dn);
240 return rc;
241 }
242
prrn_update_node(__be32 phandle)243 static void prrn_update_node(__be32 phandle)
244 {
245 struct pseries_hp_errorlog *hp_elog;
246 struct device_node *dn;
247
248 /*
249 * If a node is found from a the given phandle, the phandle does not
250 * represent the drc index of an LMB and we can ignore.
251 */
252 dn = of_find_node_by_phandle(be32_to_cpu(phandle));
253 if (dn) {
254 of_node_put(dn);
255 return;
256 }
257
258 hp_elog = kzalloc(sizeof(*hp_elog), GFP_KERNEL);
259 if(!hp_elog)
260 return;
261
262 hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
263 hp_elog->action = PSERIES_HP_ELOG_ACTION_READD;
264 hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
265 hp_elog->_drc_u.drc_index = phandle;
266
267 queue_hotplug_event(hp_elog, NULL, NULL);
268
269 kfree(hp_elog);
270 }
271
pseries_devicetree_update(s32 scope)272 int pseries_devicetree_update(s32 scope)
273 {
274 char *rtas_buf;
275 __be32 *data;
276 int update_nodes_token;
277 int rc;
278
279 update_nodes_token = rtas_token("ibm,update-nodes");
280 if (update_nodes_token == RTAS_UNKNOWN_SERVICE)
281 return -EINVAL;
282
283 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
284 if (!rtas_buf)
285 return -ENOMEM;
286
287 do {
288 rc = mobility_rtas_call(update_nodes_token, rtas_buf, scope);
289 if (rc && rc != 1)
290 break;
291
292 data = (__be32 *)rtas_buf + 4;
293 while (be32_to_cpu(*data) & NODE_ACTION_MASK) {
294 int i;
295 u32 action = be32_to_cpu(*data) & NODE_ACTION_MASK;
296 u32 node_count = be32_to_cpu(*data) & NODE_COUNT_MASK;
297
298 data++;
299
300 for (i = 0; i < node_count; i++) {
301 __be32 phandle = *data++;
302 __be32 drc_index;
303
304 switch (action) {
305 case DELETE_DT_NODE:
306 delete_dt_node(phandle);
307 break;
308 case UPDATE_DT_NODE:
309 update_dt_node(phandle, scope);
310
311 if (scope == PRRN_SCOPE)
312 prrn_update_node(phandle);
313
314 break;
315 case ADD_DT_NODE:
316 drc_index = *data++;
317 add_dt_node(phandle, drc_index);
318 break;
319 }
320 }
321 }
322 } while (rc == 1);
323
324 kfree(rtas_buf);
325 return rc;
326 }
327
post_mobility_fixup(void)328 void post_mobility_fixup(void)
329 {
330 int rc;
331 int activate_fw_token;
332
333 activate_fw_token = rtas_token("ibm,activate-firmware");
334 if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
335 printk(KERN_ERR "Could not make post-mobility "
336 "activate-fw call.\n");
337 return;
338 }
339
340 do {
341 rc = rtas_call(activate_fw_token, 0, 1, NULL);
342 } while (rtas_busy_delay(rc));
343
344 if (rc)
345 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc);
346
347 rc = pseries_devicetree_update(MIGRATION_SCOPE);
348 if (rc)
349 printk(KERN_ERR "Post-mobility device tree update "
350 "failed: %d\n", rc);
351
352 /* Possibly switch to a new RFI flush type */
353 pseries_setup_rfi_flush();
354
355 return;
356 }
357
migration_store(struct class * class,struct class_attribute * attr,const char * buf,size_t count)358 static ssize_t migration_store(struct class *class,
359 struct class_attribute *attr, const char *buf,
360 size_t count)
361 {
362 u64 streamid;
363 int rc;
364
365 rc = kstrtou64(buf, 0, &streamid);
366 if (rc)
367 return rc;
368
369 do {
370 rc = rtas_ibm_suspend_me(streamid);
371 if (rc == -EAGAIN)
372 ssleep(1);
373 } while (rc == -EAGAIN);
374
375 if (rc)
376 return rc;
377
378 post_mobility_fixup();
379 return count;
380 }
381
382 /*
383 * Used by drmgr to determine the kernel behavior of the migration interface.
384 *
385 * Version 1: Performs all PAPR requirements for migration including
386 * firmware activation and device tree update.
387 */
388 #define MIGRATION_API_VERSION 1
389
390 static CLASS_ATTR_WO(migration);
391 static CLASS_ATTR_STRING(api_version, 0444, __stringify(MIGRATION_API_VERSION));
392
mobility_sysfs_init(void)393 static int __init mobility_sysfs_init(void)
394 {
395 int rc;
396
397 mobility_kobj = kobject_create_and_add("mobility", kernel_kobj);
398 if (!mobility_kobj)
399 return -ENOMEM;
400
401 rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr);
402 if (rc)
403 pr_err("mobility: unable to create migration sysfs file (%d)\n", rc);
404
405 rc = sysfs_create_file(mobility_kobj, &class_attr_api_version.attr.attr);
406 if (rc)
407 pr_err("mobility: unable to create api_version sysfs file (%d)\n", rc);
408
409 return 0;
410 }
411 machine_device_initcall(pseries, mobility_sysfs_init);
412
