cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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enum-attributes.c (6821B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Functions corresponding to enumeration type attributes under
      4 * BIOS Enumeration GUID for use with dell-wmi-sysman
      5 *
      6 *  Copyright (c) 2020 Dell Inc.
      7 */
      8
      9#include "dell-wmi-sysman.h"
     10
     11get_instance_id(enumeration);
     12
     13static ssize_t current_value_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
     14{
     15	int instance_id = get_enumeration_instance_id(kobj);
     16	union acpi_object *obj;
     17	ssize_t ret;
     18
     19	if (instance_id < 0)
     20		return instance_id;
     21
     22	/* need to use specific instance_id and guid combination to get right data */
     23	obj = get_wmiobj_pointer(instance_id, DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID);
     24	if (!obj)
     25		return -EIO;
     26	if (obj->package.elements[CURRENT_VAL].type != ACPI_TYPE_STRING) {
     27		kfree(obj);
     28		return -EINVAL;
     29	}
     30	ret = snprintf(buf, PAGE_SIZE, "%s\n", obj->package.elements[CURRENT_VAL].string.pointer);
     31	kfree(obj);
     32	return ret;
     33}
     34
     35/**
     36 * validate_enumeration_input() - Validate input of current_value against possible values
     37 * @instance_id: The instance on which input is validated
     38 * @buf: Input value
     39 */
     40static int validate_enumeration_input(int instance_id, const char *buf)
     41{
     42	char *options, *tmp, *p;
     43	int ret = -EINVAL;
     44
     45	options = tmp = kstrdup(wmi_priv.enumeration_data[instance_id].possible_values,
     46				 GFP_KERNEL);
     47	if (!options)
     48		return -ENOMEM;
     49
     50	while ((p = strsep(&options, ";")) != NULL) {
     51		if (!*p)
     52			continue;
     53		if (!strcasecmp(p, buf)) {
     54			ret = 0;
     55			break;
     56		}
     57	}
     58
     59	kfree(tmp);
     60	return ret;
     61}
     62
     63attribute_s_property_show(display_name_language_code, enumeration);
     64static struct kobj_attribute displ_langcode =
     65		__ATTR_RO(display_name_language_code);
     66
     67attribute_s_property_show(display_name, enumeration);
     68static struct kobj_attribute displ_name =
     69		__ATTR_RO(display_name);
     70
     71attribute_s_property_show(default_value, enumeration);
     72static struct kobj_attribute default_val =
     73		__ATTR_RO(default_value);
     74
     75attribute_property_store(current_value, enumeration);
     76static struct kobj_attribute current_val =
     77		__ATTR_RW_MODE(current_value, 0600);
     78
     79attribute_s_property_show(dell_modifier, enumeration);
     80static struct kobj_attribute modifier =
     81		__ATTR_RO(dell_modifier);
     82
     83attribute_s_property_show(dell_value_modifier, enumeration);
     84static struct kobj_attribute value_modfr =
     85		__ATTR_RO(dell_value_modifier);
     86
     87attribute_s_property_show(possible_values, enumeration);
     88static struct kobj_attribute poss_val =
     89		__ATTR_RO(possible_values);
     90
     91static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr,
     92			 char *buf)
     93{
     94	return sprintf(buf, "enumeration\n");
     95}
     96static struct kobj_attribute type =
     97		__ATTR_RO(type);
     98
     99static struct attribute *enumeration_attrs[] = {
    100	&displ_langcode.attr,
    101	&displ_name.attr,
    102	&default_val.attr,
    103	&current_val.attr,
    104	&modifier.attr,
    105	&value_modfr.attr,
    106	&poss_val.attr,
    107	&type.attr,
    108	NULL,
    109};
    110
    111static const struct attribute_group enumeration_attr_group = {
    112	.attrs = enumeration_attrs,
    113};
    114
    115int alloc_enum_data(void)
    116{
    117	int ret = 0;
    118
    119	wmi_priv.enumeration_instances_count =
    120		get_instance_count(DELL_WMI_BIOS_ENUMERATION_ATTRIBUTE_GUID);
    121	wmi_priv.enumeration_data = kcalloc(wmi_priv.enumeration_instances_count,
    122					sizeof(struct enumeration_data), GFP_KERNEL);
    123	if (!wmi_priv.enumeration_data) {
    124		wmi_priv.enumeration_instances_count = 0;
    125		ret = -ENOMEM;
    126	}
    127	return ret;
    128}
    129
    130/**
    131 * populate_enum_data() - Populate all properties of an instance under enumeration attribute
    132 * @enumeration_obj: ACPI object with enumeration data
    133 * @instance_id: The instance to enumerate
    134 * @attr_name_kobj: The parent kernel object
    135 * @enum_property_count: Total properties count under enumeration type
    136 */
    137int populate_enum_data(union acpi_object *enumeration_obj, int instance_id,
    138			struct kobject *attr_name_kobj, u32 enum_property_count)
    139{
    140	int i, next_obj, value_modifier_count, possible_values_count;
    141
    142	wmi_priv.enumeration_data[instance_id].attr_name_kobj = attr_name_kobj;
    143	if (check_property_type(enumeration, ATTR_NAME, ACPI_TYPE_STRING))
    144		return -EINVAL;
    145	strlcpy_attr(wmi_priv.enumeration_data[instance_id].attribute_name,
    146		enumeration_obj[ATTR_NAME].string.pointer);
    147	if (check_property_type(enumeration, DISPL_NAME_LANG_CODE, ACPI_TYPE_STRING))
    148		return -EINVAL;
    149	strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name_language_code,
    150		enumeration_obj[DISPL_NAME_LANG_CODE].string.pointer);
    151	if (check_property_type(enumeration, DISPLAY_NAME, ACPI_TYPE_STRING))
    152		return -EINVAL;
    153	strlcpy_attr(wmi_priv.enumeration_data[instance_id].display_name,
    154		enumeration_obj[DISPLAY_NAME].string.pointer);
    155	if (check_property_type(enumeration, DEFAULT_VAL, ACPI_TYPE_STRING))
    156		return -EINVAL;
    157	strlcpy_attr(wmi_priv.enumeration_data[instance_id].default_value,
    158		enumeration_obj[DEFAULT_VAL].string.pointer);
    159	if (check_property_type(enumeration, MODIFIER, ACPI_TYPE_STRING))
    160		return -EINVAL;
    161	strlcpy_attr(wmi_priv.enumeration_data[instance_id].dell_modifier,
    162		enumeration_obj[MODIFIER].string.pointer);
    163
    164	next_obj = MODIFIER + 1;
    165
    166	if (next_obj >= enum_property_count)
    167		return -EINVAL;
    168
    169	if (check_property_type(enumeration, next_obj, ACPI_TYPE_INTEGER))
    170		return -EINVAL;
    171	value_modifier_count = (uintptr_t)enumeration_obj[next_obj++].string.pointer;
    172
    173	for (i = 0; i < value_modifier_count; i++) {
    174		if (next_obj >= enum_property_count)
    175			return -EINVAL;
    176		if (check_property_type(enumeration, next_obj, ACPI_TYPE_STRING))
    177			return -EINVAL;
    178		strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier,
    179			enumeration_obj[next_obj++].string.pointer);
    180		strcat(wmi_priv.enumeration_data[instance_id].dell_value_modifier, ";");
    181	}
    182
    183	if (next_obj >= enum_property_count)
    184		return -EINVAL;
    185
    186	if (check_property_type(enumeration, next_obj, ACPI_TYPE_INTEGER))
    187		return -EINVAL;
    188	possible_values_count = (uintptr_t) enumeration_obj[next_obj++].string.pointer;
    189
    190	for (i = 0; i < possible_values_count; i++) {
    191		if (next_obj >= enum_property_count)
    192			return -EINVAL;
    193		if (check_property_type(enumeration, next_obj, ACPI_TYPE_STRING))
    194			return -EINVAL;
    195		strcat(wmi_priv.enumeration_data[instance_id].possible_values,
    196			enumeration_obj[next_obj++].string.pointer);
    197		strcat(wmi_priv.enumeration_data[instance_id].possible_values, ";");
    198	}
    199
    200	return sysfs_create_group(attr_name_kobj, &enumeration_attr_group);
    201}
    202
    203/**
    204 * exit_enum_attributes() - Clear all attribute data
    205 *
    206 * Clears all data allocated for this group of attributes
    207 */
    208void exit_enum_attributes(void)
    209{
    210	int instance_id;
    211
    212	for (instance_id = 0; instance_id < wmi_priv.enumeration_instances_count; instance_id++) {
    213		if (wmi_priv.enumeration_data[instance_id].attr_name_kobj)
    214			sysfs_remove_group(wmi_priv.enumeration_data[instance_id].attr_name_kobj,
    215								&enumeration_attr_group);
    216	}
    217	wmi_priv.enumeration_instances_count = 0;
    218
    219	kfree(wmi_priv.enumeration_data);
    220	wmi_priv.enumeration_data = NULL;
    221}