drivers/crypto/qat/qat_common/adf_cfg.c

   1 // SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
   2 /* Copyright(c) 2014 - 2020 Intel Corporation */
   3 #include <linux/mutex.h>
   4 #include <linux/slab.h>
   5 #include <linux/list.h>
   6 #include <linux/seq_file.h>
   7 #include "adf_accel_devices.h"
   8 #include "adf_cfg.h"
   9 #include "adf_common_drv.h"
  10
  11 static DEFINE_MUTEX(qat_cfg_read_lock);
  12
  13 static void *qat_dev_cfg_start(struct seq_file *sfile, loff_t *pos)
  14 {
  15         struct adf_cfg_device_data *dev_cfg = sfile->private;
  16
  17         mutex_lock(&qat_cfg_read_lock);
  18         return seq_list_start(&dev_cfg->sec_list, *pos);
  19 }
  20
  21 static int qat_dev_cfg_show(struct seq_file *sfile, void *v)
  22 {
  23         struct list_head *list;
  24         struct adf_cfg_section *sec =
  25                                 list_entry(v, struct adf_cfg_section, list);
  26
  27         seq_printf(sfile, "[%s]\n", sec->name);
  28         list_for_each(list, &sec->param_head) {
  29                 struct adf_cfg_key_val *ptr =
  30                         list_entry(list, struct adf_cfg_key_val, list);
  31                 seq_printf(sfile, "%s = %s\n", ptr->key, ptr->val);
  32         }
  33         return 0;
  34 }
  35
  36 static void *qat_dev_cfg_next(struct seq_file *sfile, void *v, loff_t *pos)
  37 {
  38         struct adf_cfg_device_data *dev_cfg = sfile->private;
  39
  40         return seq_list_next(v, &dev_cfg->sec_list, pos);
  41 }
  42
  43 static void qat_dev_cfg_stop(struct seq_file *sfile, void *v)
  44 {
  45         mutex_unlock(&qat_cfg_read_lock);
  46 }
  47
  48 static const struct seq_operations qat_dev_cfg_sops = {
  49         .start = qat_dev_cfg_start,
  50         .next = qat_dev_cfg_next,
  51         .stop = qat_dev_cfg_stop,
  52         .show = qat_dev_cfg_show
  53 };
  54
  55 DEFINE_SEQ_ATTRIBUTE(qat_dev_cfg);
  56
  57 /**
  58  * adf_cfg_dev_add() - Create an acceleration device configuration table.
  59  * @accel_dev:  Pointer to acceleration device.
  60  *
  61  * Function creates a configuration table for the given acceleration device.
  62  * The table stores device specific config values.
  63  * To be used by QAT device specific drivers.
  64  *
  65  * Return: 0 on success, error code otherwise.
  66  */
  67 int adf_cfg_dev_add(struct adf_accel_dev *accel_dev)
  68 {
  69         struct adf_cfg_device_data *dev_cfg_data;
  70
  71         dev_cfg_data = kzalloc(sizeof(*dev_cfg_data), GFP_KERNEL);
  72         if (!dev_cfg_data)
  73                 return -ENOMEM;
  74         INIT_LIST_HEAD(&dev_cfg_data->sec_list);
  75         init_rwsem(&dev_cfg_data->lock);
  76         accel_dev->cfg = dev_cfg_data;
  77
  78         /* accel_dev->debugfs_dir should always be non-NULL here */
  79         dev_cfg_data->debug = debugfs_create_file("dev_cfg", S_IRUSR,
  80                                                   accel_dev->debugfs_dir,
  81                                                   dev_cfg_data,
  82                                                   &qat_dev_cfg_fops);
  83         return 0;
  84 }
  85 EXPORT_SYMBOL_GPL(adf_cfg_dev_add);
  86
  87 static void adf_cfg_section_del_all(struct list_head *head);
  88
  89 void adf_cfg_del_all(struct adf_accel_dev *accel_dev)
  90 {
  91         struct adf_cfg_device_data *dev_cfg_data = accel_dev->cfg;
  92
  93         down_write(&dev_cfg_data->lock);
  94         adf_cfg_section_del_all(&dev_cfg_data->sec_list);
  95         up_write(&dev_cfg_data->lock);
  96         clear_bit(ADF_STATUS_CONFIGURED, &accel_dev->status);
  97 }
  98
  99 /**
 100  * adf_cfg_dev_remove() - Clears acceleration device configuration table.
 101  * @accel_dev:  Pointer to acceleration device.
 102  *
 103  * Function removes configuration table from the given acceleration device
 104  * and frees all allocated memory.
 105  * To be used by QAT device specific drivers.
 106  *
 107  * Return: void
 108  */
 109 void adf_cfg_dev_remove(struct adf_accel_dev *accel_dev)
 110 {
 111         struct adf_cfg_device_data *dev_cfg_data = accel_dev->cfg;
 112
 113         if (!dev_cfg_data)
 114                 return;
 115
 116         down_write(&dev_cfg_data->lock);
 117         adf_cfg_section_del_all(&dev_cfg_data->sec_list);
 118         up_write(&dev_cfg_data->lock);
 119         debugfs_remove(dev_cfg_data->debug);
 120         kfree(dev_cfg_data);
 121         accel_dev->cfg = NULL;
 122 }
 123 EXPORT_SYMBOL_GPL(adf_cfg_dev_remove);
 124
 125 static void adf_cfg_keyval_add(struct adf_cfg_key_val *new,
 126                                struct adf_cfg_section *sec)
 127 {
 128         list_add_tail(&new->list, &sec->param_head);
 129 }
 130
 131 static void adf_cfg_keyval_del_all(struct list_head *head)
 132 {
 133         struct list_head *list_ptr, *tmp;
 134
 135         list_for_each_prev_safe(list_ptr, tmp, head) {
 136                 struct adf_cfg_key_val *ptr =
 137                         list_entry(list_ptr, struct adf_cfg_key_val, list);
 138                 list_del(list_ptr);
 139                 kfree(ptr);
 140         }
 141 }
 142
 143 static void adf_cfg_section_del_all(struct list_head *head)
 144 {
 145         struct adf_cfg_section *ptr;
 146         struct list_head *list, *tmp;
 147
 148         list_for_each_prev_safe(list, tmp, head) {
 149                 ptr = list_entry(list, struct adf_cfg_section, list);
 150                 adf_cfg_keyval_del_all(&ptr->param_head);
 151                 list_del(list);
 152                 kfree(ptr);
 153         }
 154 }
 155
 156 static struct adf_cfg_key_val *adf_cfg_key_value_find(struct adf_cfg_section *s,
 157                                                       const char *key)
 158 {
 159         struct list_head *list;
 160
 161         list_for_each(list, &s->param_head) {
 162                 struct adf_cfg_key_val *ptr =
 163                         list_entry(list, struct adf_cfg_key_val, list);
 164                 if (!strcmp(ptr->key, key))
 165                         return ptr;
 166         }
 167         return NULL;
 168 }
 169
 170 static struct adf_cfg_section *adf_cfg_sec_find(struct adf_accel_dev *accel_dev,
 171                                                 const char *sec_name)
 172 {
 173         struct adf_cfg_device_data *cfg = accel_dev->cfg;
 174         struct list_head *list;
 175
 176         list_for_each(list, &cfg->sec_list) {
 177                 struct adf_cfg_section *ptr =
 178                         list_entry(list, struct adf_cfg_section, list);
 179                 if (!strcmp(ptr->name, sec_name))
 180                         return ptr;
 181         }
 182         return NULL;
 183 }
 184
 185 static int adf_cfg_key_val_get(struct adf_accel_dev *accel_dev,
 186                                const char *sec_name,
 187                                const char *key_name,
 188                                char *val)
 189 {
 190         struct adf_cfg_section *sec = adf_cfg_sec_find(accel_dev, sec_name);
 191         struct adf_cfg_key_val *keyval = NULL;
 192
 193         if (sec)
 194                 keyval = adf_cfg_key_value_find(sec, key_name);
 195         if (keyval) {
 196                 memcpy(val, keyval->val, ADF_CFG_MAX_VAL_LEN_IN_BYTES);
 197                 return 0;
 198         }
 199         return -ENODATA;
 200 }
 201
 202 /**
 203  * adf_cfg_add_key_value_param() - Add key-value config entry to config table.
 204  * @accel_dev:  Pointer to acceleration device.
 205  * @section_name: Name of the section where the param will be added
 206  * @key: The key string
 207  * @val: Value pain for the given @key
 208  * @type: Type - string, int or address
 209  *
 210  * Function adds configuration key - value entry in the appropriate section
 211  * in the given acceleration device
 212  * To be used by QAT device specific drivers.
 213  *
 214  * Return: 0 on success, error code otherwise.
 215  */
 216 int adf_cfg_add_key_value_param(struct adf_accel_dev *accel_dev,
 217                                 const char *section_name,
 218                                 const char *key, const void *val,
 219                                 enum adf_cfg_val_type type)
 220 {
 221         struct adf_cfg_device_data *cfg = accel_dev->cfg;
 222         struct adf_cfg_key_val *key_val;
 223         struct adf_cfg_section *section = adf_cfg_sec_find(accel_dev,
 224                                                            section_name);
 225         if (!section)
 226                 return -EFAULT;
 227
 228         key_val = kzalloc(sizeof(*key_val), GFP_KERNEL);
 229         if (!key_val)
 230                 return -ENOMEM;
 231
 232         INIT_LIST_HEAD(&key_val->list);
 233         strlcpy(key_val->key, key, sizeof(key_val->key));
 234
 235         if (type == ADF_DEC) {
 236                 snprintf(key_val->val, ADF_CFG_MAX_VAL_LEN_IN_BYTES,
 237                          "%ld", (*((long *)val)));
 238         } else if (type == ADF_STR) {
 239                 strlcpy(key_val->val, (char *)val, sizeof(key_val->val));
 240         } else if (type == ADF_HEX) {
 241                 snprintf(key_val->val, ADF_CFG_MAX_VAL_LEN_IN_BYTES,
 242                          "0x%lx", (unsigned long)val);
 243         } else {
 244                 dev_err(&GET_DEV(accel_dev), "Unknown type given.\n");
 245                 kfree(key_val);
 246                 return -EINVAL;
 247         }
 248         key_val->type = type;
 249         down_write(&cfg->lock);
 250         adf_cfg_keyval_add(key_val, section);
 251         up_write(&cfg->lock);
 252         return 0;
 253 }
 254 EXPORT_SYMBOL_GPL(adf_cfg_add_key_value_param);
 255
 256 /**
 257  * adf_cfg_section_add() - Add config section entry to config table.
 258  * @accel_dev:  Pointer to acceleration device.
 259  * @name: Name of the section
 260  *
 261  * Function adds configuration section where key - value entries
 262  * will be stored.
 263  * To be used by QAT device specific drivers.
 264  *
 265  * Return: 0 on success, error code otherwise.
 266  */
 267 int adf_cfg_section_add(struct adf_accel_dev *accel_dev, const char *name)
 268 {
 269         struct adf_cfg_device_data *cfg = accel_dev->cfg;
 270         struct adf_cfg_section *sec = adf_cfg_sec_find(accel_dev, name);
 271
 272         if (sec)
 273                 return 0;
 274
 275         sec = kzalloc(sizeof(*sec), GFP_KERNEL);
 276         if (!sec)
 277                 return -ENOMEM;
 278
 279         strlcpy(sec->name, name, sizeof(sec->name));
 280         INIT_LIST_HEAD(&sec->param_head);
 281         down_write(&cfg->lock);
 282         list_add_tail(&sec->list, &cfg->sec_list);
 283         up_write(&cfg->lock);
 284         return 0;
 285 }
 286 EXPORT_SYMBOL_GPL(adf_cfg_section_add);
 287
 288 int adf_cfg_get_param_value(struct adf_accel_dev *accel_dev,
 289                             const char *section, const char *name,
 290                             char *value)
 291 {
 292         struct adf_cfg_device_data *cfg = accel_dev->cfg;
 293         int ret;
 294
 295         down_read(&cfg->lock);
 296         ret = adf_cfg_key_val_get(accel_dev, section, name, value);
 297         up_read(&cfg->lock);
 298         return ret;
 299 }