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12#include <linux/kobject.h>
13#include <linux/mm.h>
14#include <linux/slab.h>
15#include <linux/vmalloc.h>
16#include <linux/pagemap.h>
17#include <linux/delay.h>
18#include <linux/interrupt.h>
19
20#include <asm/opal.h>
21
22#define DUMP_TYPE_FSP 0x01
23
24struct dump_obj {
25 struct kobject kobj;
26 struct bin_attribute dump_attr;
27 uint32_t id;
28 uint32_t type;
29 uint32_t size;
30 char *buffer;
31};
32#define to_dump_obj(x) container_of(x, struct dump_obj, kobj)
33
34struct dump_attribute {
35 struct attribute attr;
36 ssize_t (*show)(struct dump_obj *dump, struct dump_attribute *attr,
37 char *buf);
38 ssize_t (*store)(struct dump_obj *dump, struct dump_attribute *attr,
39 const char *buf, size_t count);
40};
41#define to_dump_attr(x) container_of(x, struct dump_attribute, attr)
42
43static ssize_t dump_id_show(struct dump_obj *dump_obj,
44 struct dump_attribute *attr,
45 char *buf)
46{
47 return sprintf(buf, "0x%x\n", dump_obj->id);
48}
49
50static const char* dump_type_to_string(uint32_t type)
51{
52 switch (type) {
53 case 0x01: return "SP Dump";
54 case 0x02: return "System/Platform Dump";
55 case 0x03: return "SMA Dump";
56 default: return "unknown";
57 }
58}
59
60static ssize_t dump_type_show(struct dump_obj *dump_obj,
61 struct dump_attribute *attr,
62 char *buf)
63{
64
65 return sprintf(buf, "0x%x %s\n", dump_obj->type,
66 dump_type_to_string(dump_obj->type));
67}
68
69static ssize_t dump_ack_show(struct dump_obj *dump_obj,
70 struct dump_attribute *attr,
71 char *buf)
72{
73 return sprintf(buf, "ack - acknowledge dump\n");
74}
75
76
77
78
79static int64_t dump_send_ack(uint32_t dump_id)
80{
81 int rc;
82
83 rc = opal_dump_ack(dump_id);
84 if (rc)
85 pr_warn("%s: Failed to send ack to Dump ID 0x%x (%d)\n",
86 __func__, dump_id, rc);
87 return rc;
88}
89
90static ssize_t dump_ack_store(struct dump_obj *dump_obj,
91 struct dump_attribute *attr,
92 const char *buf,
93 size_t count)
94{
95 dump_send_ack(dump_obj->id);
96 sysfs_remove_file_self(&dump_obj->kobj, &attr->attr);
97 kobject_put(&dump_obj->kobj);
98 return count;
99}
100
101
102
103
104
105static struct dump_attribute id_attribute =
106 __ATTR(id, 0444, dump_id_show, NULL);
107static struct dump_attribute type_attribute =
108 __ATTR(type, 0444, dump_type_show, NULL);
109static struct dump_attribute ack_attribute =
110 __ATTR(acknowledge, 0660, dump_ack_show, dump_ack_store);
111
112static ssize_t init_dump_show(struct dump_obj *dump_obj,
113 struct dump_attribute *attr,
114 char *buf)
115{
116 return sprintf(buf, "1 - initiate Service Processor(FSP) dump\n");
117}
118
119static int64_t dump_fips_init(uint8_t type)
120{
121 int rc;
122
123 rc = opal_dump_init(type);
124 if (rc)
125 pr_warn("%s: Failed to initiate FSP dump (%d)\n",
126 __func__, rc);
127 return rc;
128}
129
130static ssize_t init_dump_store(struct dump_obj *dump_obj,
131 struct dump_attribute *attr,
132 const char *buf,
133 size_t count)
134{
135 int rc;
136
137 rc = dump_fips_init(DUMP_TYPE_FSP);
138 if (rc == OPAL_SUCCESS)
139 pr_info("%s: Initiated FSP dump\n", __func__);
140
141 return count;
142}
143
144static struct dump_attribute initiate_attribute =
145 __ATTR(initiate_dump, 0600, init_dump_show, init_dump_store);
146
147static struct attribute *initiate_attrs[] = {
148 &initiate_attribute.attr,
149 NULL,
150};
151
152static struct attribute_group initiate_attr_group = {
153 .attrs = initiate_attrs,
154};
155
156static struct kset *dump_kset;
157
158static ssize_t dump_attr_show(struct kobject *kobj,
159 struct attribute *attr,
160 char *buf)
161{
162 struct dump_attribute *attribute;
163 struct dump_obj *dump;
164
165 attribute = to_dump_attr(attr);
166 dump = to_dump_obj(kobj);
167
168 if (!attribute->show)
169 return -EIO;
170
171 return attribute->show(dump, attribute, buf);
172}
173
174static ssize_t dump_attr_store(struct kobject *kobj,
175 struct attribute *attr,
176 const char *buf, size_t len)
177{
178 struct dump_attribute *attribute;
179 struct dump_obj *dump;
180
181 attribute = to_dump_attr(attr);
182 dump = to_dump_obj(kobj);
183
184 if (!attribute->store)
185 return -EIO;
186
187 return attribute->store(dump, attribute, buf, len);
188}
189
190static const struct sysfs_ops dump_sysfs_ops = {
191 .show = dump_attr_show,
192 .store = dump_attr_store,
193};
194
195static void dump_release(struct kobject *kobj)
196{
197 struct dump_obj *dump;
198
199 dump = to_dump_obj(kobj);
200 vfree(dump->buffer);
201 kfree(dump);
202}
203
204static struct attribute *dump_default_attrs[] = {
205 &id_attribute.attr,
206 &type_attribute.attr,
207 &ack_attribute.attr,
208 NULL,
209};
210
211static struct kobj_type dump_ktype = {
212 .sysfs_ops = &dump_sysfs_ops,
213 .release = &dump_release,
214 .default_attrs = dump_default_attrs,
215};
216
217static int64_t dump_read_info(uint32_t *dump_id, uint32_t *dump_size, uint32_t *dump_type)
218{
219 __be32 id, size, type;
220 int rc;
221
222 type = cpu_to_be32(0xffffffff);
223
224 rc = opal_dump_info2(&id, &size, &type);
225 if (rc == OPAL_PARAMETER)
226 rc = opal_dump_info(&id, &size);
227
228 *dump_id = be32_to_cpu(id);
229 *dump_size = be32_to_cpu(size);
230 *dump_type = be32_to_cpu(type);
231
232 if (rc)
233 pr_warn("%s: Failed to get dump info (%d)\n",
234 __func__, rc);
235 return rc;
236}
237
238static int64_t dump_read_data(struct dump_obj *dump)
239{
240 struct opal_sg_list *list;
241 uint64_t addr;
242 int64_t rc;
243
244
245 dump->buffer = vzalloc(PAGE_ALIGN(dump->size));
246 if (!dump->buffer) {
247 pr_err("%s : Failed to allocate memory\n", __func__);
248 rc = -ENOMEM;
249 goto out;
250 }
251
252
253 list = opal_vmalloc_to_sg_list(dump->buffer, dump->size);
254 if (!list) {
255 rc = -ENOMEM;
256 goto out;
257 }
258
259
260 addr = __pa(list);
261
262
263 rc = OPAL_BUSY_EVENT;
264 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
265 rc = opal_dump_read(dump->id, addr);
266 if (rc == OPAL_BUSY_EVENT) {
267 opal_poll_events(NULL);
268 msleep(20);
269 }
270 }
271
272 if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL)
273 pr_warn("%s: Extract dump failed for ID 0x%x\n",
274 __func__, dump->id);
275
276
277 opal_free_sg_list(list);
278
279out:
280 return rc;
281}
282
283static ssize_t dump_attr_read(struct file *filep, struct kobject *kobj,
284 struct bin_attribute *bin_attr,
285 char *buffer, loff_t pos, size_t count)
286{
287 ssize_t rc;
288
289 struct dump_obj *dump = to_dump_obj(kobj);
290
291 if (!dump->buffer) {
292 rc = dump_read_data(dump);
293
294 if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) {
295 vfree(dump->buffer);
296 dump->buffer = NULL;
297
298 return -EIO;
299 }
300 if (rc == OPAL_PARTIAL) {
301
302
303
304
305 pr_info("%s: Platform dump partially read. ID = 0x%x\n",
306 __func__, dump->id);
307 return -EIO;
308 }
309 }
310
311 memcpy(buffer, dump->buffer + pos, count);
312
313
314
315
316
317
318
319 return count;
320}
321
322static struct dump_obj *create_dump_obj(uint32_t id, size_t size,
323 uint32_t type)
324{
325 struct dump_obj *dump;
326 int rc;
327
328 dump = kzalloc(sizeof(*dump), GFP_KERNEL);
329 if (!dump)
330 return NULL;
331
332 dump->kobj.kset = dump_kset;
333
334 kobject_init(&dump->kobj, &dump_ktype);
335
336 sysfs_bin_attr_init(&dump->dump_attr);
337
338 dump->dump_attr.attr.name = "dump";
339 dump->dump_attr.attr.mode = 0400;
340 dump->dump_attr.size = size;
341 dump->dump_attr.read = dump_attr_read;
342
343 dump->id = id;
344 dump->size = size;
345 dump->type = type;
346
347 rc = kobject_add(&dump->kobj, NULL, "0x%x-0x%x", type, id);
348 if (rc) {
349 kobject_put(&dump->kobj);
350 return NULL;
351 }
352
353 rc = sysfs_create_bin_file(&dump->kobj, &dump->dump_attr);
354 if (rc) {
355 kobject_put(&dump->kobj);
356 return NULL;
357 }
358
359 pr_info("%s: New platform dump. ID = 0x%x Size %u\n",
360 __func__, dump->id, dump->size);
361
362 kobject_uevent(&dump->kobj, KOBJ_ADD);
363
364 return dump;
365}
366
367static irqreturn_t process_dump(int irq, void *data)
368{
369 int rc;
370 uint32_t dump_id, dump_size, dump_type;
371 struct dump_obj *dump;
372 char name[22];
373 struct kobject *kobj;
374
375 rc = dump_read_info(&dump_id, &dump_size, &dump_type);
376 if (rc != OPAL_SUCCESS)
377 return rc;
378
379 sprintf(name, "0x%x-0x%x", dump_type, dump_id);
380
381
382
383
384
385 kobj = kset_find_obj(dump_kset, name);
386 if (kobj) {
387
388 kobject_put(kobj);
389 return 0;
390 }
391
392 dump = create_dump_obj(dump_id, dump_size, dump_type);
393 if (!dump)
394 return -1;
395
396 return IRQ_HANDLED;
397}
398
399void __init opal_platform_dump_init(void)
400{
401 int rc;
402 int dump_irq;
403
404
405 if (!opal_check_token(OPAL_DUMP_READ))
406 return;
407
408 dump_kset = kset_create_and_add("dump", NULL, opal_kobj);
409 if (!dump_kset) {
410 pr_warn("%s: Failed to create dump kset\n", __func__);
411 return;
412 }
413
414 rc = sysfs_create_group(&dump_kset->kobj, &initiate_attr_group);
415 if (rc) {
416 pr_warn("%s: Failed to create initiate dump attr group\n",
417 __func__);
418 kobject_put(&dump_kset->kobj);
419 return;
420 }
421
422 dump_irq = opal_event_request(ilog2(OPAL_EVENT_DUMP_AVAIL));
423 if (!dump_irq) {
424 pr_err("%s: Can't register OPAL event irq (%d)\n",
425 __func__, dump_irq);
426 return;
427 }
428
429 rc = request_threaded_irq(dump_irq, NULL, process_dump,
430 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
431 "opal-dump", NULL);
432 if (rc) {
433 pr_err("%s: Can't request OPAL event irq (%d)\n",
434 __func__, rc);
435 return;
436 }
437
438 if (opal_check_token(OPAL_DUMP_RESEND))
439 opal_dump_resend_notification();
440}
441
