powerpc/powernv: Read OPAL error log and export it through sysfs (774fea1a) · Commits · 戴 / test

Documentation/ABI/stable/sysfs-firmware-opal-elog

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		What: /sys/firmware/opal/elog
		Date: Feb 2014
		Contact: Stewart Smith <stewart@linux.vnet.ibm.com>
		Description:
		This directory exposes error log entries retrieved
		through the OPAL firmware interface.

		Each error log is identified by a unique ID and will
		exist until explicitly acknowledged to firmware.

		Each log entry has a directory in /sys/firmware/opal/elog.

		Log entries may be purged by the service processor
		before retrieved by firmware or retrieved/acknowledged by
		Linux if there is no room for more log entries.

		In the event that Linux has retrieved the log entries
		but not explicitly acknowledged them to firmware and
		the service processor needs more room for log entries,
		the only remaining copy of a log message may be in
		Linux.

		Typically, a user space daemon will monitor for new
		entries, read them out and acknowledge them.

		The service processor may be able to store more log
		entries than firmware can, so after you acknowledge
		an event from Linux you may instantly get another one
		from the queue that was generated some time in the past.

		The raw log format is a binary format. We currently
		do not parse this at all in kernel, leaving it up to
		user space to solve the problem. In future, we may
		do more parsing in kernel and add more files to make
		it easier for simple user space processes to extract
		more information.

		For each log entry (directory), there are the following
		files:

		id: An ASCII representation of the ID of the
		error log, in hex - e.g. "0x01".

		type: An ASCII representation of the type id and
		description of the type of error log.
		Currently just "0x00 PEL" - platform error log.
		In the future there may be additional types.

		raw: A read-only binary file that can be read
		to get the raw log entry. These are
		<16kb, often just hundreds of bytes and
		"average" 2kb.

		acknowledge: Writing 'ack' to this file will acknowledge
		the error log to firmware (and in turn
		the service processor, if applicable).
		Shortly after acknowledging it, the log
		entry will be removed from sysfs.
		Reading this file will list the supported
		operations (curently just acknowledge).
		No newline at end of file

arch/powerpc/include/asm/opal.h

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		@@ -151,6 +151,11 @@ extern int opal_enter_rtas(struct rtas_args *args,
		#define OPAL_LPC_READ 67
		#define OPAL_LPC_WRITE 68
		#define OPAL_RETURN_CPU 69
		#define OPAL_ELOG_READ 71
		#define OPAL_ELOG_WRITE 72
		#define OPAL_ELOG_ACK 73
		#define OPAL_ELOG_RESEND 74
		#define OPAL_ELOG_SIZE 75
		#define OPAL_FLASH_VALIDATE 76
		#define OPAL_FLASH_MANAGE 77
		#define OPAL_FLASH_UPDATE 78
		@@ -823,6 +828,13 @@ int64_t opal_lpc_write(uint32_t chip_id, enum OpalLPCAddressType addr_type,
		uint32_t addr, uint32_t data, uint32_t sz);
		int64_t opal_lpc_read(uint32_t chip_id, enum OpalLPCAddressType addr_type,
		uint32_t addr, __be32 *data, uint32_t sz);

		int64_t opal_read_elog(uint64_t buffer, size_t size, uint64_t log_id);
		int64_t opal_get_elog_size(uint64_t log_id, size_t size, uint64_t *elog_type);
		int64_t opal_write_elog(uint64_t buffer, uint64_t size, uint64_t offset);
		int64_t opal_send_ack_elog(uint64_t log_id);
		void opal_resend_pending_logs(void);

		int64_t opal_validate_flash(uint64_t buffer, uint32_t size, uint32_t result);
		int64_t opal_manage_flash(uint8_t op);
		int64_t opal_update_flash(uint64_t blk_list);
		@@ -863,6 +875,7 @@ extern void opal_get_rtc_time(struct rtc_time *tm);
		extern unsigned long opal_get_boot_time(void);
		extern void opal_nvram_init(void);
		extern void opal_flash_init(void);
		extern int opal_elog_init(void);

		extern int opal_machine_check(struct pt_regs *regs);
		extern bool opal_mce_check_early_recovery(struct pt_regs *regs);

arch/powerpc/platforms/powernv/Makefile

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		obj-y += setup.o opal-takeover.o opal-wrappers.o opal.o
		obj-y += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
		obj-y += rng.o
		obj-y += rng.o opal-elog.o

		obj-$(CONFIG_SMP) += smp.o
		obj-$(CONFIG_PCI) += pci.o pci-p5ioc2.o pci-ioda.o

arch/powerpc/platforms/powernv/opal-elog.c

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		/*
		* Error log support on PowerNV.
		*
		* 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/kernel.h>
		#include <linux/init.h>
		#include <linux/of.h>
		#include <linux/slab.h>
		#include <linux/sysfs.h>
		#include <linux/fs.h>
		#include <linux/vmalloc.h>
		#include <linux/fcntl.h>
		#include <linux/kobject.h>
		#include <asm/uaccess.h>
		#include <asm/opal.h>

		struct elog_obj {
		struct kobject kobj;
		struct bin_attribute raw_attr;
		uint64_t id;
		uint64_t type;
		size_t size;
		char *buffer;
		};
		#define to_elog_obj(x) container_of(x, struct elog_obj, kobj)

		struct elog_attribute {
		struct attribute attr;
		ssize_t (show)(struct elog_obj elog, struct elog_attribute *attr,
		char *buf);
		ssize_t (store)(struct elog_obj elog, struct elog_attribute *attr,
		const char *buf, size_t count);
		};
		#define to_elog_attr(x) container_of(x, struct elog_attribute, attr)

		static ssize_t elog_id_show(struct elog_obj *elog_obj,
		struct elog_attribute *attr,
		char *buf)
		{
		return sprintf(buf, "0x%llx\n", elog_obj->id);
		}

		static const char *elog_type_to_string(uint64_t type)
		{
		switch (type) {
		case 0: return "PEL";
		default: return "unknown";
		}
		}

		static ssize_t elog_type_show(struct elog_obj *elog_obj,
		struct elog_attribute *attr,
		char *buf)
		{
		return sprintf(buf, "0x%llx %s\n",
		elog_obj->type,
		elog_type_to_string(elog_obj->type));
		}

		static ssize_t elog_ack_show(struct elog_obj *elog_obj,
		struct elog_attribute *attr,
		char *buf)
		{
		return sprintf(buf, "ack - acknowledge log message\n");
		}

		static void delay_release_kobj(void *kobj)
		{
		kobject_put((struct kobject *)kobj);
		}

		static ssize_t elog_ack_store(struct elog_obj *elog_obj,
		struct elog_attribute *attr,
		const char *buf,
		size_t count)
		{
		opal_send_ack_elog(elog_obj->id);
		sysfs_schedule_callback(&elog_obj->kobj, delay_release_kobj,
		&elog_obj->kobj, THIS_MODULE);
		return count;
		}

		static struct elog_attribute id_attribute =
		__ATTR(id, 0666, elog_id_show, NULL);
		static struct elog_attribute type_attribute =
		__ATTR(type, 0666, elog_type_show, NULL);
		static struct elog_attribute ack_attribute =
		__ATTR(acknowledge, 0660, elog_ack_show, elog_ack_store);

		static struct kset *elog_kset;

		static ssize_t elog_attr_show(struct kobject *kobj,
		struct attribute *attr,
		char *buf)
		{
		struct elog_attribute *attribute;
		struct elog_obj *elog;

		attribute = to_elog_attr(attr);
		elog = to_elog_obj(kobj);

		if (!attribute->show)
		return -EIO;

		return attribute->show(elog, attribute, buf);
		}

		static ssize_t elog_attr_store(struct kobject *kobj,
		struct attribute *attr,
		const char *buf, size_t len)
		{
		struct elog_attribute *attribute;
		struct elog_obj *elog;

		attribute = to_elog_attr(attr);
		elog = to_elog_obj(kobj);

		if (!attribute->store)
		return -EIO;

		return attribute->store(elog, attribute, buf, len);
		}

		static const struct sysfs_ops elog_sysfs_ops = {
		.show = elog_attr_show,
		.store = elog_attr_store,
		};

		static void elog_release(struct kobject *kobj)
		{
		struct elog_obj *elog;

		elog = to_elog_obj(kobj);
		kfree(elog->buffer);
		kfree(elog);
		}

		static struct attribute *elog_default_attrs[] = {
		&id_attribute.attr,
		&type_attribute.attr,
		&ack_attribute.attr,
		NULL,
		};

		static struct kobj_type elog_ktype = {
		.sysfs_ops = &elog_sysfs_ops,
		.release = &elog_release,
		.default_attrs = elog_default_attrs,
		};

		/* Maximum size of a single log on FSP is 16KB */
		#define OPAL_MAX_ERRLOG_SIZE 16384

		static ssize_t raw_attr_read(struct file filep, struct kobject kobj,
		struct bin_attribute *bin_attr,
		char *buffer, loff_t pos, size_t count)
		{
		int opal_rc;

		struct elog_obj *elog = to_elog_obj(kobj);

		/* We may have had an error reading before, so let's retry */
		if (!elog->buffer) {
		elog->buffer = kzalloc(elog->size, GFP_KERNEL);
		if (!elog->buffer)
		return -EIO;

		opal_rc = opal_read_elog(__pa(elog->buffer),
		elog->size, elog->id);
		if (opal_rc != OPAL_SUCCESS) {
		pr_err("ELOG: log read failed for log-id=%llx\n",
		elog->id);
		kfree(elog->buffer);
		elog->buffer = NULL;
		return -EIO;
		}
		}

		memcpy(buffer, elog->buffer + pos, count);

		return count;
		}

		static struct elog_obj *create_elog_obj(uint64_t id, size_t size, uint64_t type)
		{
		struct elog_obj *elog;
		int rc;

		elog = kzalloc(sizeof(*elog), GFP_KERNEL);
		if (!elog)
		return NULL;

		elog->kobj.kset = elog_kset;

		kobject_init(&elog->kobj, &elog_ktype);

		sysfs_bin_attr_init(&elog->raw_attr);

		elog->raw_attr.attr.name = "raw";
		elog->raw_attr.attr.mode = 0400;
		elog->raw_attr.size = size;
		elog->raw_attr.read = raw_attr_read;

		elog->id = id;
		elog->size = size;
		elog->type = type;

		elog->buffer = kzalloc(elog->size, GFP_KERNEL);

		if (elog->buffer) {
		rc = opal_read_elog(__pa(elog->buffer),
		elog->size, elog->id);
		if (rc != OPAL_SUCCESS) {
		pr_err("ELOG: log read failed for log-id=%llx\n",
		elog->id);
		kfree(elog->buffer);
		elog->buffer = NULL;
		}
		}

		rc = kobject_add(&elog->kobj, NULL, "0x%llx", id);
		if (rc) {
		kobject_put(&elog->kobj);
		return NULL;
		}

		rc = sysfs_create_bin_file(&elog->kobj, &elog->raw_attr);
		if (rc) {
		kobject_put(&elog->kobj);
		return NULL;
		}

		kobject_uevent(&elog->kobj, KOBJ_ADD);

		return elog;
		}

		static void elog_work_fn(struct work_struct *work)
		{
		size_t elog_size;
		uint64_t log_id;
		uint64_t elog_type;
		int rc;
		char name[2+16+1];

		rc = opal_get_elog_size(&log_id, &elog_size, &elog_type);
		if (rc != OPAL_SUCCESS) {
		pr_err("ELOG: Opal log read failed\n");
		return;
		}

		BUG_ON(elog_size > OPAL_MAX_ERRLOG_SIZE);

		if (elog_size >= OPAL_MAX_ERRLOG_SIZE)
		elog_size = OPAL_MAX_ERRLOG_SIZE;

		sprintf(name, "0x%llx", log_id);

		/* we may get notified twice, let's handle
		* that gracefully and not create two conflicting
		* entries.
		*/
		if (kset_find_obj(elog_kset, name))
		return;

		create_elog_obj(log_id, elog_size, elog_type);
		}

		static DECLARE_WORK(elog_work, elog_work_fn);

		static int elog_event(struct notifier_block *nb,
		unsigned long events, void *change)
		{
		/* check for error log event */
		if (events & OPAL_EVENT_ERROR_LOG_AVAIL)
		schedule_work(&elog_work);
		return 0;
		}

		static struct notifier_block elog_nb = {
		.notifier_call = elog_event,
		.next = NULL,
		.priority = 0
		};

		int __init opal_elog_init(void)
		{
		int rc = 0;

		elog_kset = kset_create_and_add("elog", NULL, opal_kobj);
		if (!elog_kset) {
		pr_warn("%s: failed to create elog kset\n", __func__);
		return -1;
		}

		rc = opal_notifier_register(&elog_nb);
		if (rc) {
		pr_err("%s: Can't register OPAL event notifier (%d)\n",
		__func__, rc);
		return rc;
		}

		/* We are now ready to pull error logs from opal. */
		opal_resend_pending_logs();

		return 0;
		}

arch/powerpc/platforms/powernv/opal-wrappers.S

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		@@ -123,6 +123,11 @@ OPAL_CALL(opal_xscom_write, OPAL_XSCOM_WRITE);
		OPAL_CALL(opal_lpc_read, OPAL_LPC_READ);
		OPAL_CALL(opal_lpc_write, OPAL_LPC_WRITE);
		OPAL_CALL(opal_return_cpu, OPAL_RETURN_CPU);
		OPAL_CALL(opal_read_elog, OPAL_ELOG_READ);
		OPAL_CALL(opal_send_ack_elog, OPAL_ELOG_ACK);
		OPAL_CALL(opal_get_elog_size, OPAL_ELOG_SIZE);
		OPAL_CALL(opal_resend_pending_logs, OPAL_ELOG_RESEND);
		OPAL_CALL(opal_write_elog, OPAL_ELOG_WRITE);
		OPAL_CALL(opal_validate_flash, OPAL_FLASH_VALIDATE);
		OPAL_CALL(opal_manage_flash, OPAL_FLASH_MANAGE);
		OPAL_CALL(opal_update_flash, OPAL_FLASH_UPDATE);

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