linuxdebug/drivers/crypto/qat/qat_common/adf_cfg.c

340 lines
9.1 KiB
C

// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
/* Copyright(c) 2014 - 2020 Intel Corporation */
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/seq_file.h>
#include "adf_accel_devices.h"
#include "adf_cfg.h"
#include "adf_common_drv.h"
static DEFINE_MUTEX(qat_cfg_read_lock);
static void *qat_dev_cfg_start(struct seq_file *sfile, loff_t *pos)
{
struct adf_cfg_device_data *dev_cfg = sfile->private;
mutex_lock(&qat_cfg_read_lock);
return seq_list_start(&dev_cfg->sec_list, *pos);
}
static int qat_dev_cfg_show(struct seq_file *sfile, void *v)
{
struct list_head *list;
struct adf_cfg_section *sec =
list_entry(v, struct adf_cfg_section, list);
seq_printf(sfile, "[%s]\n", sec->name);
list_for_each(list, &sec->param_head) {
struct adf_cfg_key_val *ptr =
list_entry(list, struct adf_cfg_key_val, list);
seq_printf(sfile, "%s = %s\n", ptr->key, ptr->val);
}
return 0;
}
static void *qat_dev_cfg_next(struct seq_file *sfile, void *v, loff_t *pos)
{
struct adf_cfg_device_data *dev_cfg = sfile->private;
return seq_list_next(v, &dev_cfg->sec_list, pos);
}
static void qat_dev_cfg_stop(struct seq_file *sfile, void *v)
{
mutex_unlock(&qat_cfg_read_lock);
}
static const struct seq_operations qat_dev_cfg_sops = {
.start = qat_dev_cfg_start,
.next = qat_dev_cfg_next,
.stop = qat_dev_cfg_stop,
.show = qat_dev_cfg_show
};
DEFINE_SEQ_ATTRIBUTE(qat_dev_cfg);
/**
* adf_cfg_dev_add() - Create an acceleration device configuration table.
* @accel_dev: Pointer to acceleration device.
*
* Function creates a configuration table for the given acceleration device.
* The table stores device specific config values.
* To be used by QAT device specific drivers.
*
* Return: 0 on success, error code otherwise.
*/
int adf_cfg_dev_add(struct adf_accel_dev *accel_dev)
{
struct adf_cfg_device_data *dev_cfg_data;
dev_cfg_data = kzalloc(sizeof(*dev_cfg_data), GFP_KERNEL);
if (!dev_cfg_data)
return -ENOMEM;
INIT_LIST_HEAD(&dev_cfg_data->sec_list);
init_rwsem(&dev_cfg_data->lock);
accel_dev->cfg = dev_cfg_data;
/* accel_dev->debugfs_dir should always be non-NULL here */
dev_cfg_data->debug = debugfs_create_file("dev_cfg", S_IRUSR,
accel_dev->debugfs_dir,
dev_cfg_data,
&qat_dev_cfg_fops);
return 0;
}
EXPORT_SYMBOL_GPL(adf_cfg_dev_add);
static void adf_cfg_section_del_all(struct list_head *head);
void adf_cfg_del_all(struct adf_accel_dev *accel_dev)
{
struct adf_cfg_device_data *dev_cfg_data = accel_dev->cfg;
down_write(&dev_cfg_data->lock);
adf_cfg_section_del_all(&dev_cfg_data->sec_list);
up_write(&dev_cfg_data->lock);
clear_bit(ADF_STATUS_CONFIGURED, &accel_dev->status);
}
/**
* adf_cfg_dev_remove() - Clears acceleration device configuration table.
* @accel_dev: Pointer to acceleration device.
*
* Function removes configuration table from the given acceleration device
* and frees all allocated memory.
* To be used by QAT device specific drivers.
*
* Return: void
*/
void adf_cfg_dev_remove(struct adf_accel_dev *accel_dev)
{
struct adf_cfg_device_data *dev_cfg_data = accel_dev->cfg;
if (!dev_cfg_data)
return;
down_write(&dev_cfg_data->lock);
adf_cfg_section_del_all(&dev_cfg_data->sec_list);
up_write(&dev_cfg_data->lock);
debugfs_remove(dev_cfg_data->debug);
kfree(dev_cfg_data);
accel_dev->cfg = NULL;
}
EXPORT_SYMBOL_GPL(adf_cfg_dev_remove);
static void adf_cfg_keyval_add(struct adf_cfg_key_val *new,
struct adf_cfg_section *sec)
{
list_add_tail(&new->list, &sec->param_head);
}
static void adf_cfg_keyval_remove(const char *key, struct adf_cfg_section *sec)
{
struct list_head *head = &sec->param_head;
struct list_head *list_ptr, *tmp;
list_for_each_prev_safe(list_ptr, tmp, head) {
struct adf_cfg_key_val *ptr =
list_entry(list_ptr, struct adf_cfg_key_val, list);
if (strncmp(ptr->key, key, sizeof(ptr->key)))
continue;
list_del(list_ptr);
kfree(ptr);
break;
}
}
static void adf_cfg_keyval_del_all(struct list_head *head)
{
struct list_head *list_ptr, *tmp;
list_for_each_prev_safe(list_ptr, tmp, head) {
struct adf_cfg_key_val *ptr =
list_entry(list_ptr, struct adf_cfg_key_val, list);
list_del(list_ptr);
kfree(ptr);
}
}
static void adf_cfg_section_del_all(struct list_head *head)
{
struct adf_cfg_section *ptr;
struct list_head *list, *tmp;
list_for_each_prev_safe(list, tmp, head) {
ptr = list_entry(list, struct adf_cfg_section, list);
adf_cfg_keyval_del_all(&ptr->param_head);
list_del(list);
kfree(ptr);
}
}
static struct adf_cfg_key_val *adf_cfg_key_value_find(struct adf_cfg_section *s,
const char *key)
{
struct list_head *list;
list_for_each(list, &s->param_head) {
struct adf_cfg_key_val *ptr =
list_entry(list, struct adf_cfg_key_val, list);
if (!strcmp(ptr->key, key))
return ptr;
}
return NULL;
}
static struct adf_cfg_section *adf_cfg_sec_find(struct adf_accel_dev *accel_dev,
const char *sec_name)
{
struct adf_cfg_device_data *cfg = accel_dev->cfg;
struct list_head *list;
list_for_each(list, &cfg->sec_list) {
struct adf_cfg_section *ptr =
list_entry(list, struct adf_cfg_section, list);
if (!strcmp(ptr->name, sec_name))
return ptr;
}
return NULL;
}
static int adf_cfg_key_val_get(struct adf_accel_dev *accel_dev,
const char *sec_name,
const char *key_name,
char *val)
{
struct adf_cfg_section *sec = adf_cfg_sec_find(accel_dev, sec_name);
struct adf_cfg_key_val *keyval = NULL;
if (sec)
keyval = adf_cfg_key_value_find(sec, key_name);
if (keyval) {
memcpy(val, keyval->val, ADF_CFG_MAX_VAL_LEN_IN_BYTES);
return 0;
}
return -ENODATA;
}
/**
* adf_cfg_add_key_value_param() - Add key-value config entry to config table.
* @accel_dev: Pointer to acceleration device.
* @section_name: Name of the section where the param will be added
* @key: The key string
* @val: Value pain for the given @key
* @type: Type - string, int or address
*
* Function adds configuration key - value entry in the appropriate section
* in the given acceleration device. If the key exists already, the value
* is updated.
* To be used by QAT device specific drivers.
*
* Return: 0 on success, error code otherwise.
*/
int adf_cfg_add_key_value_param(struct adf_accel_dev *accel_dev,
const char *section_name,
const char *key, const void *val,
enum adf_cfg_val_type type)
{
struct adf_cfg_device_data *cfg = accel_dev->cfg;
struct adf_cfg_key_val *key_val;
struct adf_cfg_section *section = adf_cfg_sec_find(accel_dev,
section_name);
char temp_val[ADF_CFG_MAX_VAL_LEN_IN_BYTES];
if (!section)
return -EFAULT;
key_val = kzalloc(sizeof(*key_val), GFP_KERNEL);
if (!key_val)
return -ENOMEM;
INIT_LIST_HEAD(&key_val->list);
strscpy(key_val->key, key, sizeof(key_val->key));
if (type == ADF_DEC) {
snprintf(key_val->val, ADF_CFG_MAX_VAL_LEN_IN_BYTES,
"%ld", (*((long *)val)));
} else if (type == ADF_STR) {
strscpy(key_val->val, (char *)val, sizeof(key_val->val));
} else if (type == ADF_HEX) {
snprintf(key_val->val, ADF_CFG_MAX_VAL_LEN_IN_BYTES,
"0x%lx", (unsigned long)val);
} else {
dev_err(&GET_DEV(accel_dev), "Unknown type given.\n");
kfree(key_val);
return -EINVAL;
}
key_val->type = type;
/* Add the key-value pair as below policy:
* 1. if the key doesn't exist, add it;
* 2. if the key already exists with a different value then update it
* to the new value (the key is deleted and the newly created
* key_val containing the new value is added to the database);
* 3. if the key exists with the same value, then return without doing
* anything (the newly created key_val is freed).
*/
if (!adf_cfg_key_val_get(accel_dev, section_name, key, temp_val)) {
if (strncmp(temp_val, key_val->val, sizeof(temp_val))) {
adf_cfg_keyval_remove(key, section);
} else {
kfree(key_val);
return 0;
}
}
down_write(&cfg->lock);
adf_cfg_keyval_add(key_val, section);
up_write(&cfg->lock);
return 0;
}
EXPORT_SYMBOL_GPL(adf_cfg_add_key_value_param);
/**
* adf_cfg_section_add() - Add config section entry to config table.
* @accel_dev: Pointer to acceleration device.
* @name: Name of the section
*
* Function adds configuration section where key - value entries
* will be stored.
* To be used by QAT device specific drivers.
*
* Return: 0 on success, error code otherwise.
*/
int adf_cfg_section_add(struct adf_accel_dev *accel_dev, const char *name)
{
struct adf_cfg_device_data *cfg = accel_dev->cfg;
struct adf_cfg_section *sec = adf_cfg_sec_find(accel_dev, name);
if (sec)
return 0;
sec = kzalloc(sizeof(*sec), GFP_KERNEL);
if (!sec)
return -ENOMEM;
strscpy(sec->name, name, sizeof(sec->name));
INIT_LIST_HEAD(&sec->param_head);
down_write(&cfg->lock);
list_add_tail(&sec->list, &cfg->sec_list);
up_write(&cfg->lock);
return 0;
}
EXPORT_SYMBOL_GPL(adf_cfg_section_add);
int adf_cfg_get_param_value(struct adf_accel_dev *accel_dev,
const char *section, const char *name,
char *value)
{
struct adf_cfg_device_data *cfg = accel_dev->cfg;
int ret;
down_read(&cfg->lock);
ret = adf_cfg_key_val_get(accel_dev, section, name, value);
up_read(&cfg->lock);
return ret;
}
EXPORT_SYMBOL_GPL(adf_cfg_get_param_value);