platforms/powernv/opal-dump.c

32 	ssize_t (*show)(struct dump_obj *dump, struct dump_attribute *attr,
34 	ssize_t (*store)(struct dump_obj *dump, struct dump_attribute *attr,
69 	return sprintf(buf, "ack - acknowledge dump\n");
102 /* Attributes of a dump
103  * The binary attribute of the dump itself is dynamic
104  * due to the dynamic size of the dump
117 	return sprintf(buf, "1 - initiate Service Processor(FSP) dump\n");
126 		pr_warn("%s: Failed to initiate FSP dump (%d)\n",
140 		pr_info("%s: Initiated FSP dump\n", __func__);
164 	struct dump_obj *dump;
167 	dump = to_dump_obj(kobj);
172 	return attribute->show(dump, attribute, buf);
180 	struct dump_obj *dump;
183 	dump = to_dump_obj(kobj);
188 	return attribute->store(dump, attribute, buf, len);
198 	struct dump_obj *dump;
200 	dump = to_dump_obj(kobj);
201 	vfree(dump->buffer);
202 	kfree(dump);
231 		pr_warn("%s: Failed to get dump info (%d)\n",
243 static int64_t dump_read_data(struct dump_obj *dump)
250 	dump->buffer = vzalloc(PAGE_ALIGN(dump->size));
251 	if (!dump->buffer) {
258 	list = opal_vmalloc_to_sg_list(dump->buffer, dump->size);
270 		rc = opal_dump_read(dump->id, addr);
278 		pr_warn("%s: Extract dump failed for ID 0x%x\n",
279 			__func__, dump->id);
294 	struct dump_obj *dump = to_dump_obj(kobj);
296 	if (!dump->buffer) {
297 		rc = dump_read_data(dump);
300 			vfree(dump->buffer);
301 			dump->buffer = NULL;
310 			pr_info("%s: Platform dump partially read. ID = 0x%x\n",
311 				__func__, dump->id);
316 	memcpy(buffer, dump->buffer + pos, count);
318 	/* You may think we could free the dump buffer now and retrieve
321 	 * we keep the dump around until it's acknowledged by userspace.
329 	struct dump_obj *dump;
332 	dump = kzalloc(sizeof(*dump), GFP_KERNEL);
333 	if (!dump)
336 	dump->kobj.kset = dump_kset;
338 	kobject_init(&dump->kobj, &dump_ktype);
340 	sysfs_bin_attr_init(&dump->dump_attr);
342 	dump->dump_attr.attr.name = "dump";
343 	dump->dump_attr.attr.mode = 0400;
344 	dump->dump_attr.size = size;
345 	dump->dump_attr.read = dump_attr_read;
347 	dump->id = id;
348 	dump->size = size;
349 	dump->type = type;
351 	rc = kobject_add(&dump->kobj, NULL, "0x%x-0x%x", type, id);
353 		kobject_put(&dump->kobj);
358 	 * As soon as the sysfs file for this dump is created/activated there is
360 	 * acknowledge the dump before kobject_uevent() is called. If that
372 	kobject_get(&dump->kobj);
373 	rc = sysfs_create_bin_file(&dump->kobj, &dump->dump_attr);
375 		kobject_uevent(&dump->kobj, KOBJ_ADD);
377 		pr_info("%s: New platform dump. ID = 0x%x Size %u\n",
378 			__func__, dump->id, dump->size);
381 		kobject_put(&dump->kobj);
385 	kobject_put(&dump->kobj);
427 	dump_kset = kset_create_and_add("dump", NULL, opal_kobj);
429 		pr_warn("%s: Failed to create dump kset\n", __func__);
435 		pr_warn("%s: Failed to create initiate dump attr group\n",
450 				"opal-dump", NULL);