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8#include <linux/kobject.h>
9#include <linux/mm.h>
10#include <linux/slab.h>
11#include <linux/vmalloc.h>
12#include <linux/pagemap.h>
13#include <linux/delay.h>
14#include <linux/interrupt.h>
15
16#include <asm/opal.h>
17
18#define DUMP_TYPE_FSP 0x01
19
20struct dump_obj {
21 struct kobject kobj;
22 struct bin_attribute dump_attr;
23 uint32_t id;
24 uint32_t type;
25 uint32_t size;
26 char *buffer;
27};
28#define to_dump_obj(x) container_of(x, struct dump_obj, kobj)
29
30struct dump_attribute {
31 struct attribute attr;
32 ssize_t (*show)(struct dump_obj *dump, struct dump_attribute *attr,
33 char *buf);
34 ssize_t (*store)(struct dump_obj *dump, struct dump_attribute *attr,
35 const char *buf, size_t count);
36};
37#define to_dump_attr(x) container_of(x, struct dump_attribute, attr)
38
39static ssize_t dump_id_show(struct dump_obj *dump_obj,
40 struct dump_attribute *attr,
41 char *buf)
42{
43 return sprintf(buf, "0x%x\n", dump_obj->id);
44}
45
46static const char* dump_type_to_string(uint32_t type)
47{
48 switch (type) {
49 case 0x01: return "SP Dump";
50 case 0x02: return "System/Platform Dump";
51 case 0x03: return "SMA Dump";
52 default: return "unknown";
53 }
54}
55
56static ssize_t dump_type_show(struct dump_obj *dump_obj,
57 struct dump_attribute *attr,
58 char *buf)
59{
60
61 return sprintf(buf, "0x%x %s\n", dump_obj->type,
62 dump_type_to_string(dump_obj->type));
63}
64
65static ssize_t dump_ack_show(struct dump_obj *dump_obj,
66 struct dump_attribute *attr,
67 char *buf)
68{
69 return sprintf(buf, "ack - acknowledge dump\n");
70}
71
72
73
74
75static int64_t dump_send_ack(uint32_t dump_id)
76{
77 int rc;
78
79 rc = opal_dump_ack(dump_id);
80 if (rc)
81 pr_warn("%s: Failed to send ack to Dump ID 0x%x (%d)\n",
82 __func__, dump_id, rc);
83 return rc;
84}
85
86static ssize_t dump_ack_store(struct dump_obj *dump_obj,
87 struct dump_attribute *attr,
88 const char *buf,
89 size_t count)
90{
91 dump_send_ack(dump_obj->id);
92 sysfs_remove_file_self(&dump_obj->kobj, &attr->attr);
93 kobject_put(&dump_obj->kobj);
94 return count;
95}
96
97
98
99
100
101static struct dump_attribute id_attribute =
102 __ATTR(id, 0444, dump_id_show, NULL);
103static struct dump_attribute type_attribute =
104 __ATTR(type, 0444, dump_type_show, NULL);
105static struct dump_attribute ack_attribute =
106 __ATTR(acknowledge, 0660, dump_ack_show, dump_ack_store);
107
108static ssize_t init_dump_show(struct dump_obj *dump_obj,
109 struct dump_attribute *attr,
110 char *buf)
111{
112 return sprintf(buf, "1 - initiate Service Processor(FSP) dump\n");
113}
114
115static int64_t dump_fips_init(uint8_t type)
116{
117 int rc;
118
119 rc = opal_dump_init(type);
120 if (rc)
121 pr_warn("%s: Failed to initiate FSP dump (%d)\n",
122 __func__, rc);
123 return rc;
124}
125
126static ssize_t init_dump_store(struct dump_obj *dump_obj,
127 struct dump_attribute *attr,
128 const char *buf,
129 size_t count)
130{
131 int rc;
132
133 rc = dump_fips_init(DUMP_TYPE_FSP);
134 if (rc == OPAL_SUCCESS)
135 pr_info("%s: Initiated FSP dump\n", __func__);
136
137 return count;
138}
139
140static struct dump_attribute initiate_attribute =
141 __ATTR(initiate_dump, 0600, init_dump_show, init_dump_store);
142
143static struct attribute *initiate_attrs[] = {
144 &initiate_attribute.attr,
145 NULL,
146};
147
148static struct attribute_group initiate_attr_group = {
149 .attrs = initiate_attrs,
150};
151
152static struct kset *dump_kset;
153
154static ssize_t dump_attr_show(struct kobject *kobj,
155 struct attribute *attr,
156 char *buf)
157{
158 struct dump_attribute *attribute;
159 struct dump_obj *dump;
160
161 attribute = to_dump_attr(attr);
162 dump = to_dump_obj(kobj);
163
164 if (!attribute->show)
165 return -EIO;
166
167 return attribute->show(dump, attribute, buf);
168}
169
170static ssize_t dump_attr_store(struct kobject *kobj,
171 struct attribute *attr,
172 const char *buf, size_t len)
173{
174 struct dump_attribute *attribute;
175 struct dump_obj *dump;
176
177 attribute = to_dump_attr(attr);
178 dump = to_dump_obj(kobj);
179
180 if (!attribute->store)
181 return -EIO;
182
183 return attribute->store(dump, attribute, buf, len);
184}
185
186static const struct sysfs_ops dump_sysfs_ops = {
187 .show = dump_attr_show,
188 .store = dump_attr_store,
189};
190
191static void dump_release(struct kobject *kobj)
192{
193 struct dump_obj *dump;
194
195 dump = to_dump_obj(kobj);
196 vfree(dump->buffer);
197 kfree(dump);
198}
199
200static struct attribute *dump_default_attrs[] = {
201 &id_attribute.attr,
202 &type_attribute.attr,
203 &ack_attribute.attr,
204 NULL,
205};
206
207static struct kobj_type dump_ktype = {
208 .sysfs_ops = &dump_sysfs_ops,
209 .release = &dump_release,
210 .default_attrs = dump_default_attrs,
211};
212
213static int64_t dump_read_info(uint32_t *dump_id, uint32_t *dump_size, uint32_t *dump_type)
214{
215 __be32 id, size, type;
216 int rc;
217
218 type = cpu_to_be32(0xffffffff);
219
220 rc = opal_dump_info2(&id, &size, &type);
221 if (rc == OPAL_PARAMETER)
222 rc = opal_dump_info(&id, &size);
223
224 if (rc) {
225 pr_warn("%s: Failed to get dump info (%d)\n",
226 __func__, rc);
227 return rc;
228 }
229
230 *dump_id = be32_to_cpu(id);
231 *dump_size = be32_to_cpu(size);
232 *dump_type = be32_to_cpu(type);
233
234 return rc;
235}
236
237static int64_t dump_read_data(struct dump_obj *dump)
238{
239 struct opal_sg_list *list;
240 uint64_t addr;
241 int64_t rc;
242
243
244 dump->buffer = vzalloc(PAGE_ALIGN(dump->size));
245 if (!dump->buffer) {
246 pr_err("%s : Failed to allocate memory\n", __func__);
247 rc = -ENOMEM;
248 goto out;
249 }
250
251
252 list = opal_vmalloc_to_sg_list(dump->buffer, dump->size);
253 if (!list) {
254 rc = -ENOMEM;
255 goto out;
256 }
257
258
259 addr = __pa(list);
260
261
262 rc = OPAL_BUSY_EVENT;
263 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
264 rc = opal_dump_read(dump->id, addr);
265 if (rc == OPAL_BUSY_EVENT) {
266 opal_poll_events(NULL);
267 msleep(20);
268 }
269 }
270
271 if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL)
272 pr_warn("%s: Extract dump failed for ID 0x%x\n",
273 __func__, dump->id);
274
275
276 opal_free_sg_list(list);
277
278out:
279 return rc;
280}
281
282static ssize_t dump_attr_read(struct file *filep, struct kobject *kobj,
283 struct bin_attribute *bin_attr,
284 char *buffer, loff_t pos, size_t count)
285{
286 ssize_t rc;
287
288 struct dump_obj *dump = to_dump_obj(kobj);
289
290 if (!dump->buffer) {
291 rc = dump_read_data(dump);
292
293 if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) {
294 vfree(dump->buffer);
295 dump->buffer = NULL;
296
297 return -EIO;
298 }
299 if (rc == OPAL_PARTIAL) {
300
301
302
303
304 pr_info("%s: Platform dump partially read. ID = 0x%x\n",
305 __func__, dump->id);
306 return -EIO;
307 }
308 }
309
310 memcpy(buffer, dump->buffer + pos, count);
311
312
313
314
315
316
317
318 return count;
319}
320
321static struct dump_obj *create_dump_obj(uint32_t id, size_t size,
322 uint32_t type)
323{
324 struct dump_obj *dump;
325 int rc;
326
327 dump = kzalloc(sizeof(*dump), GFP_KERNEL);
328 if (!dump)
329 return NULL;
330
331 dump->kobj.kset = dump_kset;
332
333 kobject_init(&dump->kobj, &dump_ktype);
334
335 sysfs_bin_attr_init(&dump->dump_attr);
336
337 dump->dump_attr.attr.name = "dump";
338 dump->dump_attr.attr.mode = 0400;
339 dump->dump_attr.size = size;
340 dump->dump_attr.read = dump_attr_read;
341
342 dump->id = id;
343 dump->size = size;
344 dump->type = type;
345
346 rc = kobject_add(&dump->kobj, NULL, "0x%x-0x%x", type, id);
347 if (rc) {
348 kobject_put(&dump->kobj);
349 return NULL;
350 }
351
352 rc = sysfs_create_bin_file(&dump->kobj, &dump->dump_attr);
353 if (rc) {
354 kobject_put(&dump->kobj);
355 return NULL;
356 }
357
358 pr_info("%s: New platform dump. ID = 0x%x Size %u\n",
359 __func__, dump->id, dump->size);
360
361 kobject_uevent(&dump->kobj, KOBJ_ADD);
362
363 return dump;
364}
365
366static irqreturn_t process_dump(int irq, void *data)
367{
368 int rc;
369 uint32_t dump_id, dump_size, dump_type;
370 char name[22];
371 struct kobject *kobj;
372
373 rc = dump_read_info(&dump_id, &dump_size, &dump_type);
374 if (rc != OPAL_SUCCESS)
375 return IRQ_HANDLED;
376
377 sprintf(name, "0x%x-0x%x", dump_type, dump_id);
378
379
380
381
382
383 kobj = kset_find_obj(dump_kset, name);
384 if (kobj) {
385
386 kobject_put(kobj);
387 return IRQ_HANDLED;
388 }
389
390 create_dump_obj(dump_id, dump_size, dump_type);
391
392 return IRQ_HANDLED;
393}
394
395void __init opal_platform_dump_init(void)
396{
397 int rc;
398 int dump_irq;
399
400
401 if (!opal_check_token(OPAL_DUMP_READ))
402 return;
403
404 dump_kset = kset_create_and_add("dump", NULL, opal_kobj);
405 if (!dump_kset) {
406 pr_warn("%s: Failed to create dump kset\n", __func__);
407 return;
408 }
409
410 rc = sysfs_create_group(&dump_kset->kobj, &initiate_attr_group);
411 if (rc) {
412 pr_warn("%s: Failed to create initiate dump attr group\n",
413 __func__);
414 kobject_put(&dump_kset->kobj);
415 return;
416 }
417
418 dump_irq = opal_event_request(ilog2(OPAL_EVENT_DUMP_AVAIL));
419 if (!dump_irq) {
420 pr_err("%s: Can't register OPAL event irq (%d)\n",
421 __func__, dump_irq);
422 return;
423 }
424
425 rc = request_threaded_irq(dump_irq, NULL, process_dump,
426 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
427 "opal-dump", NULL);
428 if (rc) {
429 pr_err("%s: Can't request OPAL event irq (%d)\n",
430 __func__, rc);
431 return;
432 }
433
434 if (opal_check_token(OPAL_DUMP_RESEND))
435 opal_dump_resend_notification();
436}
437
