Commit | Line | Data |
---|---|---|
410bccf9 NF |
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> | |
b56eade5 | 15 | #include <linux/stat.h> |
410bccf9 NF |
16 | #include <linux/completion.h> |
17 | #include <linux/device.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/slab.h> | |
20 | ||
21 | #include <asm/rtas.h> | |
22 | #include "pseries.h" | |
23 | ||
24 | static struct kobject *mobility_kobj; | |
25 | ||
26 | struct update_props_workarea { | |
27 | u32 phandle; | |
28 | u32 state; | |
29 | u64 reserved; | |
30 | u32 nprops; | |
d0ef4403 | 31 | } __packed; |
410bccf9 NF |
32 | |
33 | #define NODE_ACTION_MASK 0xff000000 | |
34 | #define NODE_COUNT_MASK 0x00ffffff | |
35 | ||
36 | #define DELETE_DT_NODE 0x01000000 | |
37 | #define UPDATE_DT_NODE 0x02000000 | |
38 | #define ADD_DT_NODE 0x03000000 | |
39 | ||
762ec157 NF |
40 | #define MIGRATION_SCOPE (1) |
41 | ||
42 | static int mobility_rtas_call(int token, char *buf, s32 scope) | |
410bccf9 NF |
43 | { |
44 | int rc; | |
45 | ||
46 | spin_lock(&rtas_data_buf_lock); | |
47 | ||
48 | memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE); | |
762ec157 | 49 | rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, scope); |
410bccf9 NF |
50 | memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE); |
51 | ||
52 | spin_unlock(&rtas_data_buf_lock); | |
53 | return rc; | |
54 | } | |
55 | ||
56 | static int delete_dt_node(u32 phandle) | |
57 | { | |
58 | struct device_node *dn; | |
59 | ||
60 | dn = of_find_node_by_phandle(phandle); | |
61 | if (!dn) | |
62 | return -ENOENT; | |
63 | ||
64 | dlpar_detach_node(dn); | |
14cd820a | 65 | of_node_put(dn); |
410bccf9 NF |
66 | return 0; |
67 | } | |
68 | ||
69 | static int update_dt_property(struct device_node *dn, struct property **prop, | |
70 | const char *name, u32 vd, char *value) | |
71 | { | |
72 | struct property *new_prop = *prop; | |
410bccf9 NF |
73 | int more = 0; |
74 | ||
75 | /* A negative 'vd' value indicates that only part of the new property | |
76 | * value is contained in the buffer and we need to call | |
77 | * ibm,update-properties again to get the rest of the value. | |
78 | * | |
79 | * A negative value is also the two's compliment of the actual value. | |
80 | */ | |
81 | if (vd & 0x80000000) { | |
82 | vd = ~vd + 1; | |
83 | more = 1; | |
84 | } | |
85 | ||
86 | if (new_prop) { | |
87 | /* partial property fixup */ | |
88 | char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL); | |
89 | if (!new_data) | |
90 | return -ENOMEM; | |
91 | ||
92 | memcpy(new_data, new_prop->value, new_prop->length); | |
93 | memcpy(new_data + new_prop->length, value, vd); | |
94 | ||
95 | kfree(new_prop->value); | |
96 | new_prop->value = new_data; | |
97 | new_prop->length += vd; | |
98 | } else { | |
99 | new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL); | |
100 | if (!new_prop) | |
101 | return -ENOMEM; | |
102 | ||
103 | new_prop->name = kstrdup(name, GFP_KERNEL); | |
104 | if (!new_prop->name) { | |
105 | kfree(new_prop); | |
106 | return -ENOMEM; | |
107 | } | |
108 | ||
109 | new_prop->length = vd; | |
110 | new_prop->value = kzalloc(new_prop->length, GFP_KERNEL); | |
111 | if (!new_prop->value) { | |
112 | kfree(new_prop->name); | |
113 | kfree(new_prop); | |
114 | return -ENOMEM; | |
115 | } | |
116 | ||
117 | memcpy(new_prop->value, value, vd); | |
118 | *prop = new_prop; | |
119 | } | |
120 | ||
121 | if (!more) { | |
79d1c712 | 122 | of_update_property(dn, new_prop); |
d8e533b4 | 123 | *prop = NULL; |
410bccf9 NF |
124 | } |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
762ec157 | 129 | static int update_dt_node(u32 phandle, s32 scope) |
410bccf9 NF |
130 | { |
131 | struct update_props_workarea *upwa; | |
132 | struct device_node *dn; | |
133 | struct property *prop = NULL; | |
638a405f | 134 | int i, rc, rtas_rc; |
410bccf9 NF |
135 | char *prop_data; |
136 | char *rtas_buf; | |
137 | int update_properties_token; | |
2e9b7b02 | 138 | u32 vd; |
410bccf9 NF |
139 | |
140 | update_properties_token = rtas_token("ibm,update-properties"); | |
141 | if (update_properties_token == RTAS_UNKNOWN_SERVICE) | |
142 | return -EINVAL; | |
143 | ||
144 | rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); | |
145 | if (!rtas_buf) | |
146 | return -ENOMEM; | |
147 | ||
148 | dn = of_find_node_by_phandle(phandle); | |
149 | if (!dn) { | |
150 | kfree(rtas_buf); | |
151 | return -ENOENT; | |
152 | } | |
153 | ||
154 | upwa = (struct update_props_workarea *)&rtas_buf[0]; | |
155 | upwa->phandle = phandle; | |
156 | ||
157 | do { | |
638a405f | 158 | rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf, |
762ec157 | 159 | scope); |
638a405f | 160 | if (rtas_rc < 0) |
410bccf9 NF |
161 | break; |
162 | ||
163 | prop_data = rtas_buf + sizeof(*upwa); | |
164 | ||
c8f5a57c TD |
165 | /* On the first call to ibm,update-properties for a node the |
166 | * the first property value descriptor contains an empty | |
167 | * property name, the property value length encoded as u32, | |
168 | * and the property value is the node path being updated. | |
2e9b7b02 | 169 | */ |
c8f5a57c TD |
170 | if (*prop_data == 0) { |
171 | prop_data++; | |
172 | vd = *(u32 *)prop_data; | |
173 | prop_data += vd + sizeof(vd); | |
174 | upwa->nprops--; | |
175 | } | |
2e9b7b02 | 176 | |
c8f5a57c | 177 | for (i = 0; i < upwa->nprops; i++) { |
410bccf9 | 178 | char *prop_name; |
410bccf9 | 179 | |
2e9b7b02 | 180 | prop_name = prop_data; |
410bccf9 | 181 | prop_data += strlen(prop_name) + 1; |
2e9b7b02 NF |
182 | vd = *(u32 *)prop_data; |
183 | prop_data += sizeof(vd); | |
410bccf9 NF |
184 | |
185 | switch (vd) { | |
186 | case 0x00000000: | |
187 | /* name only property, nothing to do */ | |
188 | break; | |
189 | ||
190 | case 0x80000000: | |
191 | prop = of_find_property(dn, prop_name, NULL); | |
79d1c712 | 192 | of_remove_property(dn, prop); |
410bccf9 NF |
193 | prop = NULL; |
194 | break; | |
195 | ||
196 | default: | |
197 | rc = update_dt_property(dn, &prop, prop_name, | |
198 | vd, prop_data); | |
199 | if (rc) { | |
200 | printk(KERN_ERR "Could not update %s" | |
201 | " property\n", prop_name); | |
202 | } | |
203 | ||
204 | prop_data += vd; | |
205 | } | |
206 | } | |
638a405f | 207 | } while (rtas_rc == 1); |
410bccf9 NF |
208 | |
209 | of_node_put(dn); | |
210 | kfree(rtas_buf); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | static int add_dt_node(u32 parent_phandle, u32 drc_index) | |
215 | { | |
216 | struct device_node *dn; | |
217 | struct device_node *parent_dn; | |
218 | int rc; | |
219 | ||
8d5ff320 TD |
220 | parent_dn = of_find_node_by_phandle(parent_phandle); |
221 | if (!parent_dn) | |
410bccf9 NF |
222 | return -ENOENT; |
223 | ||
8d5ff320 TD |
224 | dn = dlpar_configure_connector(drc_index, parent_dn); |
225 | if (!dn) | |
410bccf9 | 226 | return -ENOENT; |
410bccf9 | 227 | |
410bccf9 NF |
228 | rc = dlpar_attach_node(dn); |
229 | if (rc) | |
230 | dlpar_free_cc_nodes(dn); | |
231 | ||
232 | of_node_put(parent_dn); | |
233 | return rc; | |
234 | } | |
235 | ||
762ec157 | 236 | int pseries_devicetree_update(s32 scope) |
410bccf9 NF |
237 | { |
238 | char *rtas_buf; | |
239 | u32 *data; | |
240 | int update_nodes_token; | |
241 | int rc; | |
242 | ||
243 | update_nodes_token = rtas_token("ibm,update-nodes"); | |
244 | if (update_nodes_token == RTAS_UNKNOWN_SERVICE) | |
245 | return -EINVAL; | |
246 | ||
247 | rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); | |
248 | if (!rtas_buf) | |
249 | return -ENOMEM; | |
250 | ||
251 | do { | |
762ec157 | 252 | rc = mobility_rtas_call(update_nodes_token, rtas_buf, scope); |
410bccf9 NF |
253 | if (rc && rc != 1) |
254 | break; | |
255 | ||
256 | data = (u32 *)rtas_buf + 4; | |
257 | while (*data & NODE_ACTION_MASK) { | |
258 | int i; | |
259 | u32 action = *data & NODE_ACTION_MASK; | |
260 | int node_count = *data & NODE_COUNT_MASK; | |
261 | ||
262 | data++; | |
263 | ||
264 | for (i = 0; i < node_count; i++) { | |
265 | u32 phandle = *data++; | |
266 | u32 drc_index; | |
267 | ||
268 | switch (action) { | |
269 | case DELETE_DT_NODE: | |
270 | delete_dt_node(phandle); | |
271 | break; | |
272 | case UPDATE_DT_NODE: | |
762ec157 | 273 | update_dt_node(phandle, scope); |
410bccf9 NF |
274 | break; |
275 | case ADD_DT_NODE: | |
276 | drc_index = *data++; | |
277 | add_dt_node(phandle, drc_index); | |
278 | break; | |
279 | } | |
280 | } | |
281 | } | |
282 | } while (rc == 1); | |
283 | ||
284 | kfree(rtas_buf); | |
285 | return rc; | |
286 | } | |
287 | ||
288 | void post_mobility_fixup(void) | |
289 | { | |
290 | int rc; | |
291 | int activate_fw_token; | |
292 | ||
762ec157 | 293 | rc = pseries_devicetree_update(MIGRATION_SCOPE); |
410bccf9 NF |
294 | if (rc) { |
295 | printk(KERN_ERR "Initial post-mobility device tree update " | |
296 | "failed: %d\n", rc); | |
297 | return; | |
298 | } | |
299 | ||
300 | activate_fw_token = rtas_token("ibm,activate-firmware"); | |
301 | if (activate_fw_token == RTAS_UNKNOWN_SERVICE) { | |
302 | printk(KERN_ERR "Could not make post-mobility " | |
303 | "activate-fw call.\n"); | |
304 | return; | |
305 | } | |
306 | ||
307 | rc = rtas_call(activate_fw_token, 0, 1, NULL); | |
308 | if (!rc) { | |
762ec157 | 309 | rc = pseries_devicetree_update(MIGRATION_SCOPE); |
410bccf9 NF |
310 | if (rc) |
311 | printk(KERN_ERR "Secondary post-mobility device tree " | |
312 | "update failed: %d\n", rc); | |
313 | } else { | |
314 | printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc); | |
315 | return; | |
316 | } | |
317 | ||
318 | return; | |
319 | } | |
320 | ||
321 | static ssize_t migrate_store(struct class *class, struct class_attribute *attr, | |
322 | const char *buf, size_t count) | |
323 | { | |
324 | struct rtas_args args; | |
325 | u64 streamid; | |
326 | int rc; | |
327 | ||
328 | rc = strict_strtoull(buf, 0, &streamid); | |
329 | if (rc) | |
330 | return rc; | |
331 | ||
332 | memset(&args, 0, sizeof(args)); | |
333 | args.token = rtas_token("ibm,suspend-me"); | |
334 | args.nargs = 2; | |
335 | args.nret = 1; | |
336 | ||
337 | args.args[0] = streamid >> 32 ; | |
338 | args.args[1] = streamid & 0xffffffff; | |
339 | args.rets = &args.args[args.nargs]; | |
340 | ||
341 | do { | |
342 | args.rets[0] = 0; | |
343 | rc = rtas_ibm_suspend_me(&args); | |
344 | if (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE) | |
345 | ssleep(1); | |
346 | } while (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE); | |
347 | ||
348 | if (rc) | |
349 | return rc; | |
350 | else if (args.rets[0]) | |
351 | return args.rets[0]; | |
352 | ||
353 | post_mobility_fixup(); | |
354 | return count; | |
355 | } | |
356 | ||
357 | static CLASS_ATTR(migration, S_IWUSR, NULL, migrate_store); | |
358 | ||
359 | static int __init mobility_sysfs_init(void) | |
360 | { | |
361 | int rc; | |
362 | ||
363 | mobility_kobj = kobject_create_and_add("mobility", kernel_kobj); | |
364 | if (!mobility_kobj) | |
365 | return -ENOMEM; | |
366 | ||
367 | rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr); | |
368 | ||
369 | return rc; | |
370 | } | |
371 | device_initcall(mobility_sysfs_init); |