cregit-Linux how code gets into the kernel

Release 4.14 arch/powerpc/platforms/powernv/opal-dump.c

/*
 * PowerNV OPAL Dump Interface
 *
 * Copyright 2013,2014 IBM Corp.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/kobject.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/delay.h>
#include <linux/interrupt.h>

#include <asm/opal.h>


#define DUMP_TYPE_FSP	0x01


struct dump_obj {
	
struct kobject  kobj;
	
struct bin_attribute dump_attr;
	
uint32_t	id;  /* becomes object name */
	
uint32_t	type;
	
uint32_t	size;
	
char		*buffer;
};

#define to_dump_obj(x) container_of(x, struct dump_obj, kobj)


struct dump_attribute {
	
struct attribute attr;
	
ssize_t (*show)(struct dump_obj *dump, struct dump_attribute *attr,
			char *buf);
	
ssize_t (*store)(struct dump_obj *dump, struct dump_attribute *attr,
			 const char *buf, size_t count);
};

#define to_dump_attr(x) container_of(x, struct dump_attribute, attr)


static ssize_t dump_id_show(struct dump_obj *dump_obj, struct dump_attribute *attr, char *buf) { return sprintf(buf, "0x%x\n", dump_obj->id); }

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Stewart Smith32100.00%1100.00%
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static const char* dump_type_to_string(uint32_t type) { switch (type) { case 0x01: return "SP Dump"; case 0x02: return "System/Platform Dump"; case 0x03: return "SMA Dump"; default: return "unknown"; } }

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static ssize_t dump_type_show(struct dump_obj *dump_obj, struct dump_attribute *attr, char *buf) { return sprintf(buf, "0x%x %s\n", dump_obj->type, dump_type_to_string(dump_obj->type)); }

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Stewart Smith39100.00%1100.00%
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static ssize_t dump_ack_show(struct dump_obj *dump_obj, struct dump_attribute *attr, char *buf) { return sprintf(buf, "ack - acknowledge dump\n"); }

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/* * Send acknowledgement to OPAL */
static int64_t dump_send_ack(uint32_t dump_id) { int rc; rc = opal_dump_ack(dump_id); if (rc) pr_warn("%s: Failed to send ack to Dump ID 0x%x (%d)\n", __func__, dump_id, rc); return rc; }

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static ssize_t dump_ack_store(struct dump_obj *dump_obj, struct dump_attribute *attr, const char *buf, size_t count) { dump_send_ack(dump_obj->id); sysfs_remove_file_self(&dump_obj->kobj, &attr->attr); kobject_put(&dump_obj->kobj); return count; }

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Stewart Smith55100.00%2100.00%
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/* Attributes of a dump * The binary attribute of the dump itself is dynamic * due to the dynamic size of the dump */ static struct dump_attribute id_attribute = __ATTR(id, S_IRUGO, dump_id_show, NULL); static struct dump_attribute type_attribute = __ATTR(type, S_IRUGO, dump_type_show, NULL); static struct dump_attribute ack_attribute = __ATTR(acknowledge, 0660, dump_ack_show, dump_ack_store);
static ssize_t init_dump_show(struct dump_obj *dump_obj, struct dump_attribute *attr, char *buf) { return sprintf(buf, "1 - initiate Service Processor(FSP) dump\n"); }

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Stewart Smith2796.43%150.00%
Vasant Hegde13.57%150.00%
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static int64_t dump_fips_init(uint8_t type) { int rc; rc = opal_dump_init(type); if (rc) pr_warn("%s: Failed to initiate FSP dump (%d)\n", __func__, rc); return rc; }

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Stewart Smith3497.14%150.00%
Vasant Hegde12.86%150.00%
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static ssize_t init_dump_store(struct dump_obj *dump_obj, struct dump_attribute *attr, const char *buf, size_t count) { int rc; rc = dump_fips_init(DUMP_TYPE_FSP); if (rc == OPAL_SUCCESS) pr_info("%s: Initiated FSP dump\n", __func__); return count; }

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Stewart Smith3978.00%150.00%
Vasant Hegde1122.00%150.00%
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static struct dump_attribute initiate_attribute = __ATTR(initiate_dump, 0600, init_dump_show, init_dump_store); static struct attribute *initiate_attrs[] = { &initiate_attribute.attr, NULL, }; static struct attribute_group initiate_attr_group = { .attrs = initiate_attrs, }; static struct kset *dump_kset;
static ssize_t dump_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) { struct dump_attribute *attribute; struct dump_obj *dump; attribute = to_dump_attr(attr); dump = to_dump_obj(kobj); if (!attribute->show) return -EIO; return attribute->show(dump, attribute, buf); }

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static ssize_t dump_attr_store(struct kobject *kobj, struct attribute *attr, const char *buf, size_t len) { struct dump_attribute *attribute; struct dump_obj *dump; attribute = to_dump_attr(attr); dump = to_dump_obj(kobj); if (!attribute->store) return -EIO; return attribute->store(dump, attribute, buf, len); }

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static const struct sysfs_ops dump_sysfs_ops = { .show = dump_attr_show, .store = dump_attr_store, };
static void dump_release(struct kobject *kobj) { struct dump_obj *dump; dump = to_dump_obj(kobj); vfree(dump->buffer); kfree(dump); }

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Stewart Smith35100.00%1100.00%
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static struct attribute *dump_default_attrs[] = { &id_attribute.attr, &type_attribute.attr, &ack_attribute.attr, NULL, }; static struct kobj_type dump_ktype = { .sysfs_ops = &dump_sysfs_ops, .release = &dump_release, .default_attrs = dump_default_attrs, };
static int64_t dump_read_info(uint32_t *dump_id, uint32_t *dump_size, uint32_t *dump_type) { __be32 id, size, type; int rc; type = cpu_to_be32(0xffffffff); rc = opal_dump_info2(&id, &size, &type); if (rc == OPAL_PARAMETER) rc = opal_dump_info(&id, &size); *dump_id = be32_to_cpu(id); *dump_size = be32_to_cpu(size); *dump_type = be32_to_cpu(type); if (rc) pr_warn("%s: Failed to get dump info (%d)\n", __func__, rc); return rc; }

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Stewart Smith6460.38%150.00%
Anton Blanchard4239.62%150.00%
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static int64_t dump_read_data(struct dump_obj *dump) { struct opal_sg_list *list; uint64_t addr; int64_t rc; /* Allocate memory */ dump->buffer = vzalloc(PAGE_ALIGN(dump->size)); if (!dump->buffer) { pr_err("%s : Failed to allocate memory\n", __func__); rc = -ENOMEM; goto out; } /* Generate SG list */ list = opal_vmalloc_to_sg_list(dump->buffer, dump->size); if (!list) { rc = -ENOMEM; goto out; } /* First entry address */ addr = __pa(list); /* Fetch data */ rc = OPAL_BUSY_EVENT; while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) { rc = opal_dump_read(dump->id, addr); if (rc == OPAL_BUSY_EVENT) { opal_poll_events(NULL); msleep(20); } } if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) pr_warn("%s: Extract dump failed for ID 0x%x\n", __func__, dump->id); /* Free SG list */ opal_free_sg_list(list); out: return rc; }

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Stewart Smith16895.45%150.00%
Anton Blanchard84.55%150.00%
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static ssize_t dump_attr_read(struct file *filep, struct kobject *kobj, struct bin_attribute *bin_attr, char *buffer, loff_t pos, size_t count) { ssize_t rc; struct dump_obj *dump = to_dump_obj(kobj); if (!dump->buffer) { rc = dump_read_data(dump); if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) { vfree(dump->buffer); dump->buffer = NULL; return -EIO; } if (rc == OPAL_PARTIAL) { /* On a partial read, we just return EIO * and rely on userspace to ask us to try * again. */ pr_info("%s: Platform dump partially read. ID = 0x%x\n", __func__, dump->id); return -EIO; } } memcpy(buffer, dump->buffer + pos, count); /* You may think we could free the dump buffer now and retrieve * it again later if needed, but due to current firmware limitation, * that's not the case. So, once read into userspace once, * we keep the dump around until it's acknowledged by userspace. */ return count; }

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static struct dump_obj *create_dump_obj(uint32_t id, size_t size, uint32_t type) { struct dump_obj *dump; int rc; dump = kzalloc(sizeof(*dump), GFP_KERNEL); if (!dump) return NULL; dump->kobj.kset = dump_kset; kobject_init(&dump->kobj, &dump_ktype); sysfs_bin_attr_init(&dump->dump_attr); dump->dump_attr.attr.name = "dump"; dump->dump_attr.attr.mode = 0400; dump->dump_attr.size = size; dump->dump_attr.read = dump_attr_read; dump->id = id; dump->size = size; dump->type = type; rc = kobject_add(&dump->kobj, NULL, "0x%x-0x%x", type, id); if (rc) { kobject_put(&dump->kobj); return NULL; } rc = sysfs_create_bin_file(&dump->kobj, &dump->dump_attr); if (rc) { kobject_put(&dump->kobj); return NULL; } pr_info("%s: New platform dump. ID = 0x%x Size %u\n", __func__, dump->id, dump->size); kobject_uevent(&dump->kobj, KOBJ_ADD); return dump; }

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static irqreturn_t process_dump(int irq, void *data) { int rc; uint32_t dump_id, dump_size, dump_type; struct dump_obj *dump; char name[22]; struct kobject *kobj; rc = dump_read_info(&dump_id, &dump_size, &dump_type); if (rc != OPAL_SUCCESS) return rc; sprintf(name, "0x%x-0x%x", dump_type, dump_id); /* we may get notified twice, let's handle * that gracefully and not create two conflicting * entries. */ kobj = kset_find_obj(dump_kset, name); if (kobj) { /* Drop reference added by kset_find_obj() */ kobject_put(kobj); return 0; } dump = create_dump_obj(dump_id, dump_size, dump_type); if (!dump) return -1; return IRQ_HANDLED; }

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Stewart Smith9578.51%133.33%
Mukesh Ojha1915.70%133.33%
Alistair Popple75.79%133.33%
Total121100.00%3100.00%


void __init opal_platform_dump_init(void) { int rc; int dump_irq; /* ELOG not supported by firmware */ if (!opal_check_token(OPAL_DUMP_READ)) return; dump_kset = kset_create_and_add("dump", NULL, opal_kobj); if (!dump_kset) { pr_warn("%s: Failed to create dump kset\n", __func__); return; } rc = sysfs_create_group(&dump_kset->kobj, &initiate_attr_group); if (rc) { pr_warn("%s: Failed to create initiate dump attr group\n", __func__); kobject_put(&dump_kset->kobj); return; } dump_irq = opal_event_request(ilog2(OPAL_EVENT_DUMP_AVAIL)); if (!dump_irq) { pr_err("%s: Can't register OPAL event irq (%d)\n", __func__, dump_irq); return; } rc = request_threaded_irq(dump_irq, NULL, process_dump, IRQF_TRIGGER_HIGH | IRQF_ONESHOT, "opal-dump", NULL); if (rc) { pr_err("%s: Can't request OPAL event irq (%d)\n", __func__, rc); return; } if (opal_check_token(OPAL_DUMP_RESEND)) opal_dump_resend_notification(); }

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Stewart Smith10164.33%250.00%
Alistair Popple4629.30%125.00%
Michael Neuling106.37%125.00%
Total157100.00%4100.00%


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Stewart Smith157291.24%330.00%
Alistair Popple563.25%110.00%
Anton Blanchard502.90%220.00%
Mukesh Ojha191.10%110.00%
Vasant Hegde140.81%110.00%
Michael Neuling100.58%110.00%
Rusty Russell20.12%110.00%
Total1723100.00%10100.00%
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