mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 10:26:42 +07:00
d7f96f97c4
Some utils, like dmidecode and smbios, need to access SMBIOS entry table area in order to get information like SMBIOS version, size, etc. Currently it's done via /dev/mem. But for situation when /dev/mem usage is disabled, the utils have to use dmi sysfs instead, which doesn't represent SMBIOS entry and adds code/delay redundancy when direct access for table is needed. So this patch creates dmi/tables and adds SMBIOS entry point to allow utils in question to work correctly without /dev/mem. Also patch adds raw dmi table to simplify dmi table processing in user space, as proposed by Jean Delvare. Tested-by: Roy Franz <roy.franz@linaro.org> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@globallogic.com> Signed-off-by: Jean Delvare <jdelvare@suse.de>
697 lines
17 KiB
C
697 lines
17 KiB
C
/*
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* dmi-sysfs.c
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*
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* This module exports the DMI tables read-only to userspace through the
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* sysfs file system.
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*
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* Data is currently found below
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* /sys/firmware/dmi/...
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*
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* DMI attributes are presented in attribute files with names
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* formatted using %d-%d, so that the first integer indicates the
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* structure type (0-255), and the second field is the instance of that
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* entry.
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*
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* Copyright 2011 Google, Inc.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kobject.h>
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#include <linux/dmi.h>
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#include <linux/capability.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/io.h>
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#define MAX_ENTRY_TYPE 255 /* Most of these aren't used, but we consider
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the top entry type is only 8 bits */
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struct dmi_sysfs_entry {
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struct dmi_header dh;
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struct kobject kobj;
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int instance;
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int position;
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struct list_head list;
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struct kobject *child;
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};
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/*
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* Global list of dmi_sysfs_entry. Even though this should only be
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* manipulated at setup and teardown, the lazy nature of the kobject
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* system means we get lazy removes.
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*/
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static LIST_HEAD(entry_list);
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static DEFINE_SPINLOCK(entry_list_lock);
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/* dmi_sysfs_attribute - Top level attribute. used by all entries. */
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struct dmi_sysfs_attribute {
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struct attribute attr;
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ssize_t (*show)(struct dmi_sysfs_entry *entry, char *buf);
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};
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#define DMI_SYSFS_ATTR(_entry, _name) \
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struct dmi_sysfs_attribute dmi_sysfs_attr_##_entry##_##_name = { \
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.attr = {.name = __stringify(_name), .mode = 0400}, \
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.show = dmi_sysfs_##_entry##_##_name, \
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}
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/*
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* dmi_sysfs_mapped_attribute - Attribute where we require the entry be
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* mapped in. Use in conjunction with dmi_sysfs_specialize_attr_ops.
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*/
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struct dmi_sysfs_mapped_attribute {
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struct attribute attr;
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ssize_t (*show)(struct dmi_sysfs_entry *entry,
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const struct dmi_header *dh,
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char *buf);
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};
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#define DMI_SYSFS_MAPPED_ATTR(_entry, _name) \
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struct dmi_sysfs_mapped_attribute dmi_sysfs_attr_##_entry##_##_name = { \
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.attr = {.name = __stringify(_name), .mode = 0400}, \
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.show = dmi_sysfs_##_entry##_##_name, \
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}
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/*************************************************
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* Generic DMI entry support.
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*************************************************/
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static void dmi_entry_free(struct kobject *kobj)
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{
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kfree(kobj);
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}
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static struct dmi_sysfs_entry *to_entry(struct kobject *kobj)
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{
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return container_of(kobj, struct dmi_sysfs_entry, kobj);
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}
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static struct dmi_sysfs_attribute *to_attr(struct attribute *attr)
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{
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return container_of(attr, struct dmi_sysfs_attribute, attr);
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}
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static ssize_t dmi_sysfs_attr_show(struct kobject *kobj,
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struct attribute *_attr, char *buf)
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{
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struct dmi_sysfs_entry *entry = to_entry(kobj);
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struct dmi_sysfs_attribute *attr = to_attr(_attr);
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/* DMI stuff is only ever admin visible */
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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return attr->show(entry, buf);
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}
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static const struct sysfs_ops dmi_sysfs_attr_ops = {
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.show = dmi_sysfs_attr_show,
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};
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typedef ssize_t (*dmi_callback)(struct dmi_sysfs_entry *,
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const struct dmi_header *dh, void *);
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struct find_dmi_data {
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struct dmi_sysfs_entry *entry;
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dmi_callback callback;
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void *private;
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int instance_countdown;
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ssize_t ret;
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};
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static void find_dmi_entry_helper(const struct dmi_header *dh,
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void *_data)
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{
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struct find_dmi_data *data = _data;
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struct dmi_sysfs_entry *entry = data->entry;
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/* Is this the entry we want? */
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if (dh->type != entry->dh.type)
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return;
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if (data->instance_countdown != 0) {
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/* try the next instance? */
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data->instance_countdown--;
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return;
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}
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/*
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* Don't ever revisit the instance. Short circuit later
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* instances by letting the instance_countdown run negative
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*/
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data->instance_countdown--;
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/* Found the entry */
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data->ret = data->callback(entry, dh, data->private);
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}
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/* State for passing the read parameters through dmi_find_entry() */
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struct dmi_read_state {
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char *buf;
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loff_t pos;
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size_t count;
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};
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static ssize_t find_dmi_entry(struct dmi_sysfs_entry *entry,
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dmi_callback callback, void *private)
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{
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struct find_dmi_data data = {
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.entry = entry,
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.callback = callback,
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.private = private,
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.instance_countdown = entry->instance,
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.ret = -EIO, /* To signal the entry disappeared */
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};
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int ret;
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ret = dmi_walk(find_dmi_entry_helper, &data);
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/* This shouldn't happen, but just in case. */
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if (ret)
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return -EINVAL;
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return data.ret;
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}
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/*
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* Calculate and return the byte length of the dmi entry identified by
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* dh. This includes both the formatted portion as well as the
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* unformatted string space, including the two trailing nul characters.
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*/
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static size_t dmi_entry_length(const struct dmi_header *dh)
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{
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const char *p = (const char *)dh;
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p += dh->length;
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while (p[0] || p[1])
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p++;
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return 2 + p - (const char *)dh;
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}
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/*************************************************
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* Support bits for specialized DMI entry support
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*************************************************/
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struct dmi_entry_attr_show_data {
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struct attribute *attr;
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char *buf;
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};
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static ssize_t dmi_entry_attr_show_helper(struct dmi_sysfs_entry *entry,
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const struct dmi_header *dh,
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void *_data)
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{
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struct dmi_entry_attr_show_data *data = _data;
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struct dmi_sysfs_mapped_attribute *attr;
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attr = container_of(data->attr,
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struct dmi_sysfs_mapped_attribute, attr);
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return attr->show(entry, dh, data->buf);
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}
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static ssize_t dmi_entry_attr_show(struct kobject *kobj,
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struct attribute *attr,
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char *buf)
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{
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struct dmi_entry_attr_show_data data = {
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.attr = attr,
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.buf = buf,
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};
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/* Find the entry according to our parent and call the
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* normalized show method hanging off of the attribute */
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return find_dmi_entry(to_entry(kobj->parent),
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dmi_entry_attr_show_helper, &data);
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}
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static const struct sysfs_ops dmi_sysfs_specialize_attr_ops = {
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.show = dmi_entry_attr_show,
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};
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/*************************************************
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* Specialized DMI entry support.
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*************************************************/
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/*** Type 15 - System Event Table ***/
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#define DMI_SEL_ACCESS_METHOD_IO8 0x00
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#define DMI_SEL_ACCESS_METHOD_IO2x8 0x01
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#define DMI_SEL_ACCESS_METHOD_IO16 0x02
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#define DMI_SEL_ACCESS_METHOD_PHYS32 0x03
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#define DMI_SEL_ACCESS_METHOD_GPNV 0x04
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struct dmi_system_event_log {
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struct dmi_header header;
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u16 area_length;
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u16 header_start_offset;
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u16 data_start_offset;
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u8 access_method;
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u8 status;
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u32 change_token;
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union {
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struct {
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u16 index_addr;
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u16 data_addr;
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} io;
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u32 phys_addr32;
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u16 gpnv_handle;
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u32 access_method_address;
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};
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u8 header_format;
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u8 type_descriptors_supported_count;
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u8 per_log_type_descriptor_length;
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u8 supported_log_type_descriptos[0];
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} __packed;
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#define DMI_SYSFS_SEL_FIELD(_field) \
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static ssize_t dmi_sysfs_sel_##_field(struct dmi_sysfs_entry *entry, \
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const struct dmi_header *dh, \
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char *buf) \
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{ \
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struct dmi_system_event_log sel; \
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if (sizeof(sel) > dmi_entry_length(dh)) \
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return -EIO; \
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memcpy(&sel, dh, sizeof(sel)); \
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return sprintf(buf, "%u\n", sel._field); \
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} \
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static DMI_SYSFS_MAPPED_ATTR(sel, _field)
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DMI_SYSFS_SEL_FIELD(area_length);
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DMI_SYSFS_SEL_FIELD(header_start_offset);
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DMI_SYSFS_SEL_FIELD(data_start_offset);
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DMI_SYSFS_SEL_FIELD(access_method);
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DMI_SYSFS_SEL_FIELD(status);
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DMI_SYSFS_SEL_FIELD(change_token);
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DMI_SYSFS_SEL_FIELD(access_method_address);
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DMI_SYSFS_SEL_FIELD(header_format);
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DMI_SYSFS_SEL_FIELD(type_descriptors_supported_count);
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DMI_SYSFS_SEL_FIELD(per_log_type_descriptor_length);
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static struct attribute *dmi_sysfs_sel_attrs[] = {
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&dmi_sysfs_attr_sel_area_length.attr,
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&dmi_sysfs_attr_sel_header_start_offset.attr,
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&dmi_sysfs_attr_sel_data_start_offset.attr,
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&dmi_sysfs_attr_sel_access_method.attr,
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&dmi_sysfs_attr_sel_status.attr,
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&dmi_sysfs_attr_sel_change_token.attr,
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&dmi_sysfs_attr_sel_access_method_address.attr,
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&dmi_sysfs_attr_sel_header_format.attr,
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&dmi_sysfs_attr_sel_type_descriptors_supported_count.attr,
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&dmi_sysfs_attr_sel_per_log_type_descriptor_length.attr,
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NULL,
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};
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static struct kobj_type dmi_system_event_log_ktype = {
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.release = dmi_entry_free,
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.sysfs_ops = &dmi_sysfs_specialize_attr_ops,
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.default_attrs = dmi_sysfs_sel_attrs,
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};
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typedef u8 (*sel_io_reader)(const struct dmi_system_event_log *sel,
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loff_t offset);
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static DEFINE_MUTEX(io_port_lock);
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static u8 read_sel_8bit_indexed_io(const struct dmi_system_event_log *sel,
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loff_t offset)
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{
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u8 ret;
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mutex_lock(&io_port_lock);
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outb((u8)offset, sel->io.index_addr);
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ret = inb(sel->io.data_addr);
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mutex_unlock(&io_port_lock);
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return ret;
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}
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static u8 read_sel_2x8bit_indexed_io(const struct dmi_system_event_log *sel,
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loff_t offset)
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{
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u8 ret;
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mutex_lock(&io_port_lock);
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outb((u8)offset, sel->io.index_addr);
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outb((u8)(offset >> 8), sel->io.index_addr + 1);
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ret = inb(sel->io.data_addr);
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mutex_unlock(&io_port_lock);
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return ret;
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}
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static u8 read_sel_16bit_indexed_io(const struct dmi_system_event_log *sel,
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loff_t offset)
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{
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u8 ret;
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mutex_lock(&io_port_lock);
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outw((u16)offset, sel->io.index_addr);
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ret = inb(sel->io.data_addr);
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mutex_unlock(&io_port_lock);
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return ret;
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}
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static sel_io_reader sel_io_readers[] = {
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[DMI_SEL_ACCESS_METHOD_IO8] = read_sel_8bit_indexed_io,
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[DMI_SEL_ACCESS_METHOD_IO2x8] = read_sel_2x8bit_indexed_io,
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[DMI_SEL_ACCESS_METHOD_IO16] = read_sel_16bit_indexed_io,
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};
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static ssize_t dmi_sel_raw_read_io(struct dmi_sysfs_entry *entry,
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const struct dmi_system_event_log *sel,
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char *buf, loff_t pos, size_t count)
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{
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ssize_t wrote = 0;
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sel_io_reader io_reader = sel_io_readers[sel->access_method];
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while (count && pos < sel->area_length) {
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count--;
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*(buf++) = io_reader(sel, pos++);
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wrote++;
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}
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return wrote;
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}
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static ssize_t dmi_sel_raw_read_phys32(struct dmi_sysfs_entry *entry,
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const struct dmi_system_event_log *sel,
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char *buf, loff_t pos, size_t count)
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{
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u8 __iomem *mapped;
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ssize_t wrote = 0;
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mapped = ioremap(sel->access_method_address, sel->area_length);
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if (!mapped)
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return -EIO;
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while (count && pos < sel->area_length) {
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count--;
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*(buf++) = readb(mapped + pos++);
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wrote++;
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}
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iounmap(mapped);
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return wrote;
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}
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static ssize_t dmi_sel_raw_read_helper(struct dmi_sysfs_entry *entry,
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const struct dmi_header *dh,
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void *_state)
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{
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struct dmi_read_state *state = _state;
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struct dmi_system_event_log sel;
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if (sizeof(sel) > dmi_entry_length(dh))
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return -EIO;
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memcpy(&sel, dh, sizeof(sel));
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switch (sel.access_method) {
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case DMI_SEL_ACCESS_METHOD_IO8:
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case DMI_SEL_ACCESS_METHOD_IO2x8:
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case DMI_SEL_ACCESS_METHOD_IO16:
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return dmi_sel_raw_read_io(entry, &sel, state->buf,
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state->pos, state->count);
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case DMI_SEL_ACCESS_METHOD_PHYS32:
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return dmi_sel_raw_read_phys32(entry, &sel, state->buf,
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state->pos, state->count);
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case DMI_SEL_ACCESS_METHOD_GPNV:
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pr_info("dmi-sysfs: GPNV support missing.\n");
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return -EIO;
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default:
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pr_info("dmi-sysfs: Unknown access method %02x\n",
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sel.access_method);
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return -EIO;
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}
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}
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static ssize_t dmi_sel_raw_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t pos, size_t count)
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{
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struct dmi_sysfs_entry *entry = to_entry(kobj->parent);
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struct dmi_read_state state = {
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.buf = buf,
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.pos = pos,
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.count = count,
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};
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return find_dmi_entry(entry, dmi_sel_raw_read_helper, &state);
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}
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static struct bin_attribute dmi_sel_raw_attr = {
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.attr = {.name = "raw_event_log", .mode = 0400},
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.read = dmi_sel_raw_read,
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};
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static int dmi_system_event_log(struct dmi_sysfs_entry *entry)
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{
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int ret;
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entry->child = kzalloc(sizeof(*entry->child), GFP_KERNEL);
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if (!entry->child)
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return -ENOMEM;
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ret = kobject_init_and_add(entry->child,
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&dmi_system_event_log_ktype,
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&entry->kobj,
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"system_event_log");
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if (ret)
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goto out_free;
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ret = sysfs_create_bin_file(entry->child, &dmi_sel_raw_attr);
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if (ret)
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goto out_del;
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return 0;
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out_del:
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kobject_del(entry->child);
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out_free:
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kfree(entry->child);
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return ret;
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}
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/*************************************************
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* Generic DMI entry support.
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*************************************************/
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static ssize_t dmi_sysfs_entry_length(struct dmi_sysfs_entry *entry, char *buf)
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{
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return sprintf(buf, "%d\n", entry->dh.length);
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}
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static ssize_t dmi_sysfs_entry_handle(struct dmi_sysfs_entry *entry, char *buf)
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{
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return sprintf(buf, "%d\n", entry->dh.handle);
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}
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static ssize_t dmi_sysfs_entry_type(struct dmi_sysfs_entry *entry, char *buf)
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{
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return sprintf(buf, "%d\n", entry->dh.type);
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}
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static ssize_t dmi_sysfs_entry_instance(struct dmi_sysfs_entry *entry,
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char *buf)
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{
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return sprintf(buf, "%d\n", entry->instance);
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}
|
|
|
|
static ssize_t dmi_sysfs_entry_position(struct dmi_sysfs_entry *entry,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", entry->position);
|
|
}
|
|
|
|
static DMI_SYSFS_ATTR(entry, length);
|
|
static DMI_SYSFS_ATTR(entry, handle);
|
|
static DMI_SYSFS_ATTR(entry, type);
|
|
static DMI_SYSFS_ATTR(entry, instance);
|
|
static DMI_SYSFS_ATTR(entry, position);
|
|
|
|
static struct attribute *dmi_sysfs_entry_attrs[] = {
|
|
&dmi_sysfs_attr_entry_length.attr,
|
|
&dmi_sysfs_attr_entry_handle.attr,
|
|
&dmi_sysfs_attr_entry_type.attr,
|
|
&dmi_sysfs_attr_entry_instance.attr,
|
|
&dmi_sysfs_attr_entry_position.attr,
|
|
NULL,
|
|
};
|
|
|
|
static ssize_t dmi_entry_raw_read_helper(struct dmi_sysfs_entry *entry,
|
|
const struct dmi_header *dh,
|
|
void *_state)
|
|
{
|
|
struct dmi_read_state *state = _state;
|
|
size_t entry_length;
|
|
|
|
entry_length = dmi_entry_length(dh);
|
|
|
|
return memory_read_from_buffer(state->buf, state->count,
|
|
&state->pos, dh, entry_length);
|
|
}
|
|
|
|
static ssize_t dmi_entry_raw_read(struct file *filp,
|
|
struct kobject *kobj,
|
|
struct bin_attribute *bin_attr,
|
|
char *buf, loff_t pos, size_t count)
|
|
{
|
|
struct dmi_sysfs_entry *entry = to_entry(kobj);
|
|
struct dmi_read_state state = {
|
|
.buf = buf,
|
|
.pos = pos,
|
|
.count = count,
|
|
};
|
|
|
|
return find_dmi_entry(entry, dmi_entry_raw_read_helper, &state);
|
|
}
|
|
|
|
static const struct bin_attribute dmi_entry_raw_attr = {
|
|
.attr = {.name = "raw", .mode = 0400},
|
|
.read = dmi_entry_raw_read,
|
|
};
|
|
|
|
static void dmi_sysfs_entry_release(struct kobject *kobj)
|
|
{
|
|
struct dmi_sysfs_entry *entry = to_entry(kobj);
|
|
|
|
spin_lock(&entry_list_lock);
|
|
list_del(&entry->list);
|
|
spin_unlock(&entry_list_lock);
|
|
kfree(entry);
|
|
}
|
|
|
|
static struct kobj_type dmi_sysfs_entry_ktype = {
|
|
.release = dmi_sysfs_entry_release,
|
|
.sysfs_ops = &dmi_sysfs_attr_ops,
|
|
.default_attrs = dmi_sysfs_entry_attrs,
|
|
};
|
|
|
|
static struct kset *dmi_kset;
|
|
|
|
/* Global count of all instances seen. Only for setup */
|
|
static int __initdata instance_counts[MAX_ENTRY_TYPE + 1];
|
|
|
|
/* Global positional count of all entries seen. Only for setup */
|
|
static int __initdata position_count;
|
|
|
|
static void __init dmi_sysfs_register_handle(const struct dmi_header *dh,
|
|
void *_ret)
|
|
{
|
|
struct dmi_sysfs_entry *entry;
|
|
int *ret = _ret;
|
|
|
|
/* If a previous entry saw an error, short circuit */
|
|
if (*ret)
|
|
return;
|
|
|
|
/* Allocate and register a new entry into the entries set */
|
|
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
|
|
if (!entry) {
|
|
*ret = -ENOMEM;
|
|
return;
|
|
}
|
|
|
|
/* Set the key */
|
|
memcpy(&entry->dh, dh, sizeof(*dh));
|
|
entry->instance = instance_counts[dh->type]++;
|
|
entry->position = position_count++;
|
|
|
|
entry->kobj.kset = dmi_kset;
|
|
*ret = kobject_init_and_add(&entry->kobj, &dmi_sysfs_entry_ktype, NULL,
|
|
"%d-%d", dh->type, entry->instance);
|
|
|
|
if (*ret) {
|
|
kfree(entry);
|
|
return;
|
|
}
|
|
|
|
/* Thread on the global list for cleanup */
|
|
spin_lock(&entry_list_lock);
|
|
list_add_tail(&entry->list, &entry_list);
|
|
spin_unlock(&entry_list_lock);
|
|
|
|
/* Handle specializations by type */
|
|
switch (dh->type) {
|
|
case DMI_ENTRY_SYSTEM_EVENT_LOG:
|
|
*ret = dmi_system_event_log(entry);
|
|
break;
|
|
default:
|
|
/* No specialization */
|
|
break;
|
|
}
|
|
if (*ret)
|
|
goto out_err;
|
|
|
|
/* Create the raw binary file to access the entry */
|
|
*ret = sysfs_create_bin_file(&entry->kobj, &dmi_entry_raw_attr);
|
|
if (*ret)
|
|
goto out_err;
|
|
|
|
return;
|
|
out_err:
|
|
kobject_put(entry->child);
|
|
kobject_put(&entry->kobj);
|
|
return;
|
|
}
|
|
|
|
static void cleanup_entry_list(void)
|
|
{
|
|
struct dmi_sysfs_entry *entry, *next;
|
|
|
|
/* No locks, we are on our way out */
|
|
list_for_each_entry_safe(entry, next, &entry_list, list) {
|
|
kobject_put(entry->child);
|
|
kobject_put(&entry->kobj);
|
|
}
|
|
}
|
|
|
|
static int __init dmi_sysfs_init(void)
|
|
{
|
|
int error;
|
|
int val;
|
|
|
|
if (!dmi_kobj) {
|
|
pr_err("dmi-sysfs: dmi entry is absent.\n");
|
|
error = -ENODATA;
|
|
goto err;
|
|
}
|
|
|
|
dmi_kset = kset_create_and_add("entries", NULL, dmi_kobj);
|
|
if (!dmi_kset) {
|
|
error = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
val = 0;
|
|
error = dmi_walk(dmi_sysfs_register_handle, &val);
|
|
if (error)
|
|
goto err;
|
|
if (val) {
|
|
error = val;
|
|
goto err;
|
|
}
|
|
|
|
pr_debug("dmi-sysfs: loaded.\n");
|
|
|
|
return 0;
|
|
err:
|
|
cleanup_entry_list();
|
|
kset_unregister(dmi_kset);
|
|
return error;
|
|
}
|
|
|
|
/* clean up everything. */
|
|
static void __exit dmi_sysfs_exit(void)
|
|
{
|
|
pr_debug("dmi-sysfs: unloading.\n");
|
|
cleanup_entry_list();
|
|
kset_unregister(dmi_kset);
|
|
}
|
|
|
|
module_init(dmi_sysfs_init);
|
|
module_exit(dmi_sysfs_exit);
|
|
|
|
MODULE_AUTHOR("Mike Waychison <mikew@google.com>");
|
|
MODULE_DESCRIPTION("DMI sysfs support");
|
|
MODULE_LICENSE("GPL");
|