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Commit | Line | Data |
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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; | |
31 | }; | |
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); | |
65 | return 0; | |
66 | } | |
67 | ||
68 | static int update_dt_property(struct device_node *dn, struct property **prop, | |
69 | const char *name, u32 vd, char *value) | |
70 | { | |
71 | struct property *new_prop = *prop; | |
410bccf9 NF |
72 | int more = 0; |
73 | ||
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. | |
77 | * | |
78 | * A negative value is also the two's compliment of the actual value. | |
79 | */ | |
80 | if (vd & 0x80000000) { | |
81 | vd = ~vd + 1; | |
82 | more = 1; | |
83 | } | |
84 | ||
85 | if (new_prop) { | |
86 | /* partial property fixup */ | |
87 | char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL); | |
88 | if (!new_data) | |
89 | return -ENOMEM; | |
90 | ||
91 | memcpy(new_data, new_prop->value, new_prop->length); | |
92 | memcpy(new_data + new_prop->length, value, vd); | |
93 | ||
94 | kfree(new_prop->value); | |
95 | new_prop->value = new_data; | |
96 | new_prop->length += vd; | |
97 | } else { | |
98 | new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL); | |
99 | if (!new_prop) | |
100 | return -ENOMEM; | |
101 | ||
102 | new_prop->name = kstrdup(name, GFP_KERNEL); | |
103 | if (!new_prop->name) { | |
104 | kfree(new_prop); | |
105 | return -ENOMEM; | |
106 | } | |
107 | ||
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); | |
112 | kfree(new_prop); | |
113 | return -ENOMEM; | |
114 | } | |
115 | ||
116 | memcpy(new_prop->value, value, vd); | |
117 | *prop = new_prop; | |
118 | } | |
119 | ||
120 | if (!more) { | |
79d1c712 | 121 | of_update_property(dn, new_prop); |
d8e533b4 | 122 | *prop = NULL; |
410bccf9 NF |
123 | } |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
762ec157 | 128 | static int update_dt_node(u32 phandle, s32 scope) |
410bccf9 NF |
129 | { |
130 | struct update_props_workarea *upwa; | |
131 | struct device_node *dn; | |
132 | struct property *prop = NULL; | |
638a405f | 133 | int i, rc, rtas_rc; |
410bccf9 NF |
134 | char *prop_data; |
135 | char *rtas_buf; | |
136 | int update_properties_token; | |
2e9b7b02 | 137 | u32 vd; |
410bccf9 NF |
138 | |
139 | update_properties_token = rtas_token("ibm,update-properties"); | |
140 | if (update_properties_token == RTAS_UNKNOWN_SERVICE) | |
141 | return -EINVAL; | |
142 | ||
143 | rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); | |
144 | if (!rtas_buf) | |
145 | return -ENOMEM; | |
146 | ||
147 | dn = of_find_node_by_phandle(phandle); | |
148 | if (!dn) { | |
149 | kfree(rtas_buf); | |
150 | return -ENOENT; | |
151 | } | |
152 | ||
153 | upwa = (struct update_props_workarea *)&rtas_buf[0]; | |
154 | upwa->phandle = phandle; | |
155 | ||
156 | do { | |
638a405f | 157 | rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf, |
762ec157 | 158 | scope); |
638a405f | 159 | if (rtas_rc < 0) |
410bccf9 NF |
160 | break; |
161 | ||
162 | prop_data = rtas_buf + sizeof(*upwa); | |
163 | ||
2e9b7b02 NF |
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. | |
168 | */ | |
169 | vd = *prop_data++; | |
170 | prop_data += vd; | |
171 | ||
172 | /* The path we skipped over is counted as one of the elements | |
173 | * returned so start counting at one. | |
174 | */ | |
175 | for (i = 1; i < upwa->nprops; i++) { | |
410bccf9 | 176 | char *prop_name; |
410bccf9 | 177 | |
2e9b7b02 | 178 | prop_name = prop_data; |
410bccf9 | 179 | prop_data += strlen(prop_name) + 1; |
2e9b7b02 NF |
180 | vd = *(u32 *)prop_data; |
181 | prop_data += sizeof(vd); | |
410bccf9 NF |
182 | |
183 | switch (vd) { | |
184 | case 0x00000000: | |
185 | /* name only property, nothing to do */ | |
186 | break; | |
187 | ||
188 | case 0x80000000: | |
189 | prop = of_find_property(dn, prop_name, NULL); | |
79d1c712 | 190 | of_remove_property(dn, prop); |
410bccf9 NF |
191 | prop = NULL; |
192 | break; | |
193 | ||
194 | default: | |
195 | rc = update_dt_property(dn, &prop, prop_name, | |
196 | vd, prop_data); | |
197 | if (rc) { | |
198 | printk(KERN_ERR "Could not update %s" | |
199 | " property\n", prop_name); | |
200 | } | |
201 | ||
202 | prop_data += vd; | |
203 | } | |
204 | } | |
638a405f | 205 | } while (rtas_rc == 1); |
410bccf9 NF |
206 | |
207 | of_node_put(dn); | |
208 | kfree(rtas_buf); | |
209 | return 0; | |
210 | } | |
211 | ||
212 | static int add_dt_node(u32 parent_phandle, u32 drc_index) | |
213 | { | |
214 | struct device_node *dn; | |
215 | struct device_node *parent_dn; | |
216 | int rc; | |
217 | ||
218 | dn = dlpar_configure_connector(drc_index); | |
219 | if (!dn) | |
220 | return -ENOENT; | |
221 | ||
222 | parent_dn = of_find_node_by_phandle(parent_phandle); | |
223 | if (!parent_dn) { | |
224 | dlpar_free_cc_nodes(dn); | |
225 | return -ENOENT; | |
226 | } | |
227 | ||
228 | dn->parent = parent_dn; | |
229 | rc = dlpar_attach_node(dn); | |
230 | if (rc) | |
231 | dlpar_free_cc_nodes(dn); | |
232 | ||
233 | of_node_put(parent_dn); | |
234 | return rc; | |
235 | } | |
236 | ||
762ec157 | 237 | int pseries_devicetree_update(s32 scope) |
410bccf9 NF |
238 | { |
239 | char *rtas_buf; | |
240 | u32 *data; | |
241 | int update_nodes_token; | |
242 | int rc; | |
243 | ||
244 | update_nodes_token = rtas_token("ibm,update-nodes"); | |
245 | if (update_nodes_token == RTAS_UNKNOWN_SERVICE) | |
246 | return -EINVAL; | |
247 | ||
248 | rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL); | |
249 | if (!rtas_buf) | |
250 | return -ENOMEM; | |
251 | ||
252 | do { | |
762ec157 | 253 | rc = mobility_rtas_call(update_nodes_token, rtas_buf, scope); |
410bccf9 NF |
254 | if (rc && rc != 1) |
255 | break; | |
256 | ||
257 | data = (u32 *)rtas_buf + 4; | |
258 | while (*data & NODE_ACTION_MASK) { | |
259 | int i; | |
260 | u32 action = *data & NODE_ACTION_MASK; | |
261 | int node_count = *data & NODE_COUNT_MASK; | |
262 | ||
263 | data++; | |
264 | ||
265 | for (i = 0; i < node_count; i++) { | |
266 | u32 phandle = *data++; | |
267 | u32 drc_index; | |
268 | ||
269 | switch (action) { | |
270 | case DELETE_DT_NODE: | |
271 | delete_dt_node(phandle); | |
272 | break; | |
273 | case UPDATE_DT_NODE: | |
762ec157 | 274 | update_dt_node(phandle, scope); |
410bccf9 NF |
275 | break; |
276 | case ADD_DT_NODE: | |
277 | drc_index = *data++; | |
278 | add_dt_node(phandle, drc_index); | |
279 | break; | |
280 | } | |
281 | } | |
282 | } | |
283 | } while (rc == 1); | |
284 | ||
285 | kfree(rtas_buf); | |
286 | return rc; | |
287 | } | |
288 | ||
289 | void post_mobility_fixup(void) | |
290 | { | |
291 | int rc; | |
292 | int activate_fw_token; | |
293 | ||
762ec157 | 294 | rc = pseries_devicetree_update(MIGRATION_SCOPE); |
410bccf9 NF |
295 | if (rc) { |
296 | printk(KERN_ERR "Initial post-mobility device tree update " | |
297 | "failed: %d\n", rc); | |
298 | return; | |
299 | } | |
300 | ||
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"); | |
305 | return; | |
306 | } | |
307 | ||
308 | rc = rtas_call(activate_fw_token, 0, 1, NULL); | |
309 | if (!rc) { | |
762ec157 | 310 | rc = pseries_devicetree_update(MIGRATION_SCOPE); |
410bccf9 NF |
311 | if (rc) |
312 | printk(KERN_ERR "Secondary post-mobility device tree " | |
313 | "update failed: %d\n", rc); | |
314 | } else { | |
315 | printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc); | |
316 | return; | |
317 | } | |
318 | ||
319 | return; | |
320 | } | |
321 | ||
322 | static ssize_t migrate_store(struct class *class, struct class_attribute *attr, | |
323 | const char *buf, size_t count) | |
324 | { | |
325 | struct rtas_args args; | |
326 | u64 streamid; | |
327 | int rc; | |
328 | ||
329 | rc = strict_strtoull(buf, 0, &streamid); | |
330 | if (rc) | |
331 | return rc; | |
332 | ||
333 | memset(&args, 0, sizeof(args)); | |
334 | args.token = rtas_token("ibm,suspend-me"); | |
335 | args.nargs = 2; | |
336 | args.nret = 1; | |
337 | ||
338 | args.args[0] = streamid >> 32 ; | |
339 | args.args[1] = streamid & 0xffffffff; | |
340 | args.rets = &args.args[args.nargs]; | |
341 | ||
342 | do { | |
343 | args.rets[0] = 0; | |
344 | rc = rtas_ibm_suspend_me(&args); | |
345 | if (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE) | |
346 | ssleep(1); | |
347 | } while (!rc && args.rets[0] == RTAS_NOT_SUSPENDABLE); | |
348 | ||
349 | if (rc) | |
350 | return rc; | |
351 | else if (args.rets[0]) | |
352 | return args.rets[0]; | |
353 | ||
354 | post_mobility_fixup(); | |
355 | return count; | |
356 | } | |
357 | ||
358 | static CLASS_ATTR(migration, S_IWUSR, NULL, migrate_store); | |
359 | ||
360 | static int __init mobility_sysfs_init(void) | |
361 | { | |
362 | int rc; | |
363 | ||
364 | mobility_kobj = kobject_create_and_add("mobility", kernel_kobj); | |
365 | if (!mobility_kobj) | |
366 | return -ENOMEM; | |
367 | ||
368 | rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr); | |
369 | ||
370 | return rc; | |
371 | } | |
372 | device_initcall(mobility_sysfs_init); |