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Linux/arch/powerpc/platforms/powernv/opal-dump.c

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  1 /*
  2  * PowerNV OPAL Dump Interface
  3  *
  4  * Copyright 2013,2014 IBM Corp.
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of the GNU General Public License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  */
 11 
 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 
 24 struct dump_obj {
 25         struct kobject  kobj;
 26         struct bin_attribute dump_attr;
 27         uint32_t        id;  /* becomes object name */
 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 
 34 struct 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 
 43 static 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 
 50 static 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 
 60 static 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 
 69 static 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  * Send acknowledgement to OPAL
 78  */
 79 static 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 
 90 static 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 /* Attributes of a dump
102  * The binary attribute of the dump itself is dynamic
103  * due to the dynamic size of the dump
104  */
105 static struct dump_attribute id_attribute =
106         __ATTR(id, S_IRUGO, dump_id_show, NULL);
107 static struct dump_attribute type_attribute =
108         __ATTR(type, S_IRUGO, dump_type_show, NULL);
109 static struct dump_attribute ack_attribute =
110         __ATTR(acknowledge, 0660, dump_ack_show, dump_ack_store);
111 
112 static 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 
119 static 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 
130 static 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 
144 static struct dump_attribute initiate_attribute =
145         __ATTR(initiate_dump, 0600, init_dump_show, init_dump_store);
146 
147 static struct attribute *initiate_attrs[] = {
148         &initiate_attribute.attr,
149         NULL,
150 };
151 
152 static struct attribute_group initiate_attr_group = {
153         .attrs = initiate_attrs,
154 };
155 
156 static struct kset *dump_kset;
157 
158 static 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 
174 static 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 
190 static const struct sysfs_ops dump_sysfs_ops = {
191         .show = dump_attr_show,
192         .store = dump_attr_store,
193 };
194 
195 static 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 
204 static struct attribute *dump_default_attrs[] = {
205         &id_attribute.attr,
206         &type_attribute.attr,
207         &ack_attribute.attr,
208         NULL,
209 };
210 
211 static struct kobj_type dump_ktype = {
212         .sysfs_ops = &dump_sysfs_ops,
213         .release = &dump_release,
214         .default_attrs = dump_default_attrs,
215 };
216 
217 static 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 
238 static 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         /* Allocate memory */
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         /* Generate SG list */
253         list = opal_vmalloc_to_sg_list(dump->buffer, dump->size);
254         if (!list) {
255                 rc = -ENOMEM;
256                 goto out;
257         }
258 
259         /* First entry address */
260         addr = __pa(list);
261 
262         /* Fetch data */
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         /* Free SG list */
277         opal_free_sg_list(list);
278 
279 out:
280         return rc;
281 }
282 
283 static 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                         /* On a partial read, we just return EIO
302                          * and rely on userspace to ask us to try
303                          * again.
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         /* You may think we could free the dump buffer now and retrieve
314          * it again later if needed, but due to current firmware limitation,
315          * that's not the case. So, once read into userspace once,
316          * we keep the dump around until it's acknowledged by userspace.
317          */
318 
319         return count;
320 }
321 
322 static 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 
367 static 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 
374         rc = dump_read_info(&dump_id, &dump_size, &dump_type);
375         if (rc != OPAL_SUCCESS)
376                 return rc;
377 
378         sprintf(name, "0x%x-0x%x", dump_type, dump_id);
379 
380         /* we may get notified twice, let's handle
381          * that gracefully and not create two conflicting
382          * entries.
383          */
384         if (kset_find_obj(dump_kset, name))
385                 return 0;
386 
387         dump = create_dump_obj(dump_id, dump_size, dump_type);
388         if (!dump)
389                 return -1;
390 
391         return IRQ_HANDLED;
392 }
393 
394 void __init opal_platform_dump_init(void)
395 {
396         int rc;
397         int dump_irq;
398 
399         /* ELOG not supported by firmware */
400         if (!opal_check_token(OPAL_DUMP_READ))
401                 return;
402 
403         dump_kset = kset_create_and_add("dump", NULL, opal_kobj);
404         if (!dump_kset) {
405                 pr_warn("%s: Failed to create dump kset\n", __func__);
406                 return;
407         }
408 
409         rc = sysfs_create_group(&dump_kset->kobj, &initiate_attr_group);
410         if (rc) {
411                 pr_warn("%s: Failed to create initiate dump attr group\n",
412                         __func__);
413                 kobject_put(&dump_kset->kobj);
414                 return;
415         }
416 
417         dump_irq = opal_event_request(ilog2(OPAL_EVENT_DUMP_AVAIL));
418         if (!dump_irq) {
419                 pr_err("%s: Can't register OPAL event irq (%d)\n",
420                        __func__, dump_irq);
421                 return;
422         }
423 
424         rc = request_threaded_irq(dump_irq, NULL, process_dump,
425                                 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
426                                 "opal-dump", NULL);
427         if (rc) {
428                 pr_err("%s: Can't request OPAL event irq (%d)\n",
429                        __func__, rc);
430                 return;
431         }
432 
433         if (opal_check_token(OPAL_DUMP_RESEND))
434                 opal_dump_resend_notification();
435 }
436 

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