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// SPDX-License-Identifier: GPL-2.0
/*
* Functions corresponding to sure start object type attributes under
* BIOS for use with hp-bioscfg driver
*
* Copyright (c) 2022 HP Development Company, L.P.
*/
#include "bioscfg.h"
#include <linux/types.h>
/* Maximum number of log entries supported when log entry size is 16
* bytes. This value is calculated by dividing 4096 (page size) by
* log entry size.
*/
#define LOG_MAX_ENTRIES 254
/*
* Current Log entry size. This value size will change in the
* future. The driver reads a total of 128 bytes for each log entry
* provided by BIOS but only the first 16 bytes are used/read.
*/
#define LOG_ENTRY_SIZE 16
/*
* audit_log_entry_count_show - Reports the number of
* existing audit log entries available
* to be read
*/
static ssize_t audit_log_entry_count_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
int ret;
u32 count = 0;
ret = hp_wmi_perform_query(HPWMI_SURESTART_GET_LOG_COUNT,
HPWMI_SURESTART,
&count, 1, sizeof(count));
if (ret < 0)
return ret;
return sysfs_emit(buf, "%d,%d,%d\n", count, LOG_ENTRY_SIZE,
LOG_MAX_ENTRIES);
}
/*
* audit_log_entries_show() - Return all entries found in log file
*/
static ssize_t audit_log_entries_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
int ret;
int i;
u32 count = 0;
u8 audit_log_buffer[128];
// Get the number of event logs
ret = hp_wmi_perform_query(HPWMI_SURESTART_GET_LOG_COUNT,
HPWMI_SURESTART,
&count, 1, sizeof(count));
if (ret < 0)
return ret;
/*
* The show() api will not work if the audit logs ever go
* beyond 4KB
*/
if (count * LOG_ENTRY_SIZE > PAGE_SIZE)
return -EIO;
/*
* We are guaranteed the buffer is 4KB so today all the event
* logs will fit
*/
for (i = 0; i < count; i++) {
audit_log_buffer[0] = i + 1;
/*
* read audit log entry at a time. 'buf' input value
* provides the audit log entry to be read. On
* input, Byte 0 = Audit Log entry number from
* beginning (1..254)
* Entry number 1 is the newest entry whereas the
* highest entry number (number of entries) is the
* oldest entry.
*/
ret = hp_wmi_perform_query(HPWMI_SURESTART_GET_LOG,
HPWMI_SURESTART,
audit_log_buffer, 1, 128);
if (ret < 0 || (LOG_ENTRY_SIZE * i) > PAGE_SIZE) {
/*
* Encountered a failure while reading
* individual logs. Only a partial list of
* audit log will be returned.
*/
break;
} else {
memcpy(buf, audit_log_buffer, LOG_ENTRY_SIZE);
buf += LOG_ENTRY_SIZE;
}
}
return i * LOG_ENTRY_SIZE;
}
static struct kobj_attribute sure_start_audit_log_entry_count = __ATTR_RO(audit_log_entry_count);
static struct kobj_attribute sure_start_audit_log_entries = __ATTR_RO(audit_log_entries);
static struct attribute *sure_start_attrs[] = {
&sure_start_audit_log_entry_count.attr,
&sure_start_audit_log_entries.attr,
NULL
};
static const struct attribute_group sure_start_attr_group = {
.attrs = sure_start_attrs,
};
void hp_exit_sure_start_attributes(void)
{
sysfs_remove_group(bioscfg_drv.sure_start_attr_kobj,
&sure_start_attr_group);
}
int hp_populate_sure_start_data(struct kobject *attr_name_kobj)
{
bioscfg_drv.sure_start_attr_kobj = attr_name_kobj;
return sysfs_create_group(attr_name_kobj, &sure_start_attr_group);
}
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