1
2
3
4
5
6
7
8
9
10
11
12#include <linux/cpu.h>
13#include <linux/kernel.h>
14#include <linux/kobject.h>
15#include <linux/sched.h>
16#include <linux/smp.h>
17#include <linux/stat.h>
18#include <linux/completion.h>
19#include <linux/device.h>
20#include <linux/delay.h>
21#include <linux/slab.h>
22
23#include <asm/machdep.h>
24#include <asm/rtas.h>
25#include "pseries.h"
26#include "../../kernel/cacheinfo.h"
27
28static struct kobject *mobility_kobj;
29
30struct update_props_workarea {
31 __be32 phandle;
32 __be32 state;
33 __be64 reserved;
34 __be32 nprops;
35} __packed;
36
37#define NODE_ACTION_MASK 0xff000000
38#define NODE_COUNT_MASK 0x00ffffff
39
40#define DELETE_DT_NODE 0x01000000
41#define UPDATE_DT_NODE 0x02000000
42#define ADD_DT_NODE 0x03000000
43
44#define MIGRATION_SCOPE (1)
45#define PRRN_SCOPE -2
46
47static int mobility_rtas_call(int token, char *buf, s32 scope)
48{
49 int rc;
50
51 spin_lock(&rtas_data_buf_lock);
52
53 memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
54 rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, scope);
55 memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
56
57 spin_unlock(&rtas_data_buf_lock);
58 return rc;
59}
60
61static int delete_dt_node(__be32 phandle)
62{
63 struct device_node *dn;
64
65 dn = of_find_node_by_phandle(be32_to_cpu(phandle));
66 if (!dn)
67 return -ENOENT;
68
69 dlpar_detach_node(dn);
70 of_node_put(dn);
71 return 0;
72}
73
74static int update_dt_property(struct device_node *dn, struct property **prop,
75 const char *name, u32 vd, char *value)
76{
77 struct property *new_prop = *prop;
78 int more = 0;
79
80
81
82
83
84
85
86 if (vd & 0x80000000) {
87 vd = ~vd + 1;
88 more = 1;
89 }
90
91 if (new_prop) {
92
93 char *new_data = kzalloc(new_prop->length + vd, GFP_KERNEL);
94 if (!new_data)
95 return -ENOMEM;
96
97 memcpy(new_data, new_prop->value, new_prop->length);
98 memcpy(new_data + new_prop->length, value, vd);
99
100 kfree(new_prop->value);
101 new_prop->value = new_data;
102 new_prop->length += vd;
103 } else {
104 new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
105 if (!new_prop)
106 return -ENOMEM;
107
108 new_prop->name = kstrdup(name, GFP_KERNEL);
109 if (!new_prop->name) {
110 kfree(new_prop);
111 return -ENOMEM;
112 }
113
114 new_prop->length = vd;
115 new_prop->value = kzalloc(new_prop->length, GFP_KERNEL);
116 if (!new_prop->value) {
117 kfree(new_prop->name);
118 kfree(new_prop);
119 return -ENOMEM;
120 }
121
122 memcpy(new_prop->value, value, vd);
123 *prop = new_prop;
124 }
125
126 if (!more) {
127 of_update_property(dn, new_prop);
128 *prop = NULL;
129 }
130
131 return 0;
132}
133
134static int update_dt_node(__be32 phandle, s32 scope)
135{
136 struct update_props_workarea *upwa;
137 struct device_node *dn;
138 struct property *prop = NULL;
139 int i, rc, rtas_rc;
140 char *prop_data;
141 char *rtas_buf;
142 int update_properties_token;
143 u32 nprops;
144 u32 vd;
145
146 update_properties_token = rtas_token("ibm,update-properties");
147 if (update_properties_token == RTAS_UNKNOWN_SERVICE)
148 return -EINVAL;
149
150 rtas_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
151 if (!rtas_buf)
152 return -ENOMEM;
153
154 dn = of_find_node_by_phandle(be32_to_cpu(phandle));
155 if (!dn) {
156 kfree(rtas_buf);
157 return -ENOENT;
158 }
159
160 upwa = (struct update_props_workarea *)&rtas_buf[0];
161 upwa->phandle = phandle;
162
163 do {
164 rtas_rc = mobility_rtas_call(update_properties_token, rtas_buf,
165 scope);
166 if (rtas_rc < 0)
167 break;
168
169 prop_data = rtas_buf + sizeof(*upwa);
170 nprops = be32_to_cpu(upwa->nprops);
171
172
173
174
175
176
177 if (*prop_data == 0) {
178 prop_data++;
179 vd = be32_to_cpu(*(__be32 *)prop_data);
180 prop_data += vd + sizeof(vd);
181 nprops--;
182 }
183
184 for (i = 0; i < nprops; i++) {
185 char *prop_name;
186
187 prop_name = prop_data;
188 prop_data += strlen(prop_name) + 1;
189 vd = be32_to_cpu(*(__be32 *)prop_data);
190 prop_data += sizeof(vd);
191
192 switch (vd) {
193 case 0x00000000:
194
195 break;
196
197 case 0x80000000:
198 of_remove_property(dn, of_find_property(dn,
199 prop_name, NULL));
200 prop = NULL;
201 break;
202
203 default:
204 rc = update_dt_property(dn, &prop, prop_name,
205 vd, prop_data);
206 if (rc) {
207 printk(KERN_ERR "Could not update %s"
208 " property\n", prop_name);
209 }
210
211 prop_data += vd;
212 }
213
214 cond_resched();
215 }
216
217 cond_resched();
218 } while (rtas_rc == 1);
219
220 of_node_put(dn);
221 kfree(rtas_buf);
222 return 0;
223}
224
225static int add_dt_node(__be32 parent_phandle, __be32 drc_index)
226{
227 struct device_node *dn;
228 struct device_node *parent_dn;
229 int rc;
230
231 parent_dn = of_find_node_by_phandle(be32_to_cpu(parent_phandle));
232 if (!parent_dn)
233 return -ENOENT;
234
235 dn = dlpar_configure_connector(drc_index, parent_dn);
236 if (!dn) {
237 of_node_put(parent_dn);
238 return -ENOENT;
239 }
240
241 rc = dlpar_attach_node(dn, parent_dn);
242 if (rc)
243 dlpar_free_cc_nodes(dn);
244
245 of_node_put(parent_dn);
246 return rc;
247}
248
249static void prrn_update_node(__be32 phandle)
250{
251 struct pseries_hp_errorlog hp_elog;
252 struct device_node *dn;
253
254
255
256
257
258 dn = of_find_node_by_phandle(be32_to_cpu(phandle));
259 if (dn) {
260 of_node_put(dn);
261 return;
262 }
263
264 hp_elog.resource = PSERIES_HP_ELOG_RESOURCE_MEM;
265 hp_elog.action = PSERIES_HP_ELOG_ACTION_READD;
266 hp_elog.id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
267 hp_elog._drc_u.drc_index = phandle;
268
269 handle_dlpar_errorlog(&hp_elog);
270}
271
272int 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 cond_resched();
322 }
323 }
324
325 cond_resched();
326 } while (rc == 1);
327
328 kfree(rtas_buf);
329 return rc;
330}
331
332void post_mobility_fixup(void)
333{
334 int rc;
335 int activate_fw_token;
336
337 activate_fw_token = rtas_token("ibm,activate-firmware");
338 if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
339 printk(KERN_ERR "Could not make post-mobility "
340 "activate-fw call.\n");
341 return;
342 }
343
344 do {
345 rc = rtas_call(activate_fw_token, 0, 1, NULL);
346 } while (rtas_busy_delay(rc));
347
348 if (rc)
349 printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc);
350
351
352
353
354
355 cpus_read_lock();
356
357
358
359
360
361
362 cacheinfo_teardown();
363
364 rc = pseries_devicetree_update(MIGRATION_SCOPE);
365 if (rc)
366 printk(KERN_ERR "Post-mobility device tree update "
367 "failed: %d\n", rc);
368
369 cacheinfo_rebuild();
370
371 cpus_read_unlock();
372
373
374 pseries_setup_rfi_flush();
375
376 return;
377}
378
379static ssize_t migration_store(struct class *class,
380 struct class_attribute *attr, const char *buf,
381 size_t count)
382{
383 u64 streamid;
384 int rc;
385
386 rc = kstrtou64(buf, 0, &streamid);
387 if (rc)
388 return rc;
389
390 stop_topology_update();
391
392 do {
393 rc = rtas_ibm_suspend_me(streamid);
394 if (rc == -EAGAIN)
395 ssleep(1);
396 } while (rc == -EAGAIN);
397
398 if (rc)
399 return rc;
400
401 post_mobility_fixup();
402
403 start_topology_update();
404
405 return count;
406}
407
408
409
410
411
412
413
414#define MIGRATION_API_VERSION 1
415
416static CLASS_ATTR_WO(migration);
417static CLASS_ATTR_STRING(api_version, 0444, __stringify(MIGRATION_API_VERSION));
418
419static int __init mobility_sysfs_init(void)
420{
421 int rc;
422
423 mobility_kobj = kobject_create_and_add("mobility", kernel_kobj);
424 if (!mobility_kobj)
425 return -ENOMEM;
426
427 rc = sysfs_create_file(mobility_kobj, &class_attr_migration.attr);
428 if (rc)
429 pr_err("mobility: unable to create migration sysfs file (%d)\n", rc);
430
431 rc = sysfs_create_file(mobility_kobj, &class_attr_api_version.attr.attr);
432 if (rc)
433 pr_err("mobility: unable to create api_version sysfs file (%d)\n", rc);
434
435 return 0;
436}
437machine_device_initcall(pseries, mobility_sysfs_init);
438