drivers/crypto/qat/qat_common/adf_dev_mgr.c

   1 /*
   2   This file is provided under a dual BSD/GPLv2 license.  When using or
   3   redistributing this file, you may do so under either license.
   4
   5   GPL LICENSE SUMMARY
   6   Copyright(c) 2014 Intel Corporation.
   7   This program is free software; you can redistribute it and/or modify
   8   it under the terms of version 2 of the GNU General Public License as
   9   published by the Free Software Foundation.
  10
  11   This program is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14   General Public License for more details.
  15
  16   Contact Information:
  17   qat-linux@intel.com
  18
  19   BSD LICENSE
  20   Copyright(c) 2014 Intel Corporation.
  21   Redistribution and use in source and binary forms, with or without
  22   modification, are permitted provided that the following conditions
  23   are met:
  24
  25     * Redistributions of source code must retain the above copyright
  26       notice, this list of conditions and the following disclaimer.
  27     * Redistributions in binary form must reproduce the above copyright
  28       notice, this list of conditions and the following disclaimer in
  29       the documentation and/or other materials provided with the
  30       distribution.
  31     * Neither the name of Intel Corporation nor the names of its
  32       contributors may be used to endorse or promote products derived
  33       from this software without specific prior written permission.
  34
  35   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  36   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  37   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  38   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  39   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  41   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  42   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  43   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  44   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  45   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  46 */
  47 #include <linux/mutex.h>
  48 #include <linux/list.h>
  49 #include "adf_cfg.h"
  50 #include "adf_common_drv.h"
  51
  52 static LIST_HEAD(accel_table);
  53 static LIST_HEAD(vfs_table);
  54 static DEFINE_MUTEX(table_lock);
  55 static uint32_t num_devices;
  56 static u8 id_map[ADF_MAX_DEVICES];
  57
  58 struct vf_id_map {
  59         u32 bdf;
  60         u32 id;
  61         u32 fake_id;
  62         bool attached;
  63         struct list_head list;
  64 };
  65
  66 static int adf_get_vf_id(struct adf_accel_dev *vf)
  67 {
  68         return ((7 * (PCI_SLOT(accel_to_pci_dev(vf)->devfn) - 1)) +
  69                 PCI_FUNC(accel_to_pci_dev(vf)->devfn) +
  70                 (PCI_SLOT(accel_to_pci_dev(vf)->devfn) - 1));
  71 }
  72
  73 static int adf_get_vf_num(struct adf_accel_dev *vf)
  74 {
  75         return (accel_to_pci_dev(vf)->bus->number << 8) | adf_get_vf_id(vf);
  76 }
  77
  78 static struct vf_id_map *adf_find_vf(u32 bdf)
  79 {
  80         struct list_head *itr;
  81
  82         list_for_each(itr, &vfs_table) {
  83                 struct vf_id_map *ptr =
  84                         list_entry(itr, struct vf_id_map, list);
  85
  86                 if (ptr->bdf == bdf)
  87                         return ptr;
  88         }
  89         return NULL;
  90 }
  91
  92 static int adf_get_vf_real_id(u32 fake)
  93 {
  94         struct list_head *itr;
  95
  96         list_for_each(itr, &vfs_table) {
  97                 struct vf_id_map *ptr =
  98                         list_entry(itr, struct vf_id_map, list);
  99                 if (ptr->fake_id == fake)
 100                         return ptr->id;
 101         }
 102         return -1;
 103 }
 104
 105 /**
 106  * adf_clean_vf_map() - Cleans VF id mapings
 107  *
 108  * Function cleans internal ids for virtual functions.
 109  * @vf: flag indicating whether mappings is cleaned
 110  *      for vfs only or for vfs and pfs
 111  */
 112 void adf_clean_vf_map(bool vf)
 113 {
 114         struct vf_id_map *map;
 115         struct list_head *ptr, *tmp;
 116
 117         mutex_lock(&table_lock);
 118         list_for_each_safe(ptr, tmp, &vfs_table) {
 119                 map = list_entry(ptr, struct vf_id_map, list);
 120                 if (map->bdf != -1) {
 121                         id_map[map->id] = 0;
 122                         num_devices--;
 123                 }
 124
 125                 if (vf && map->bdf == -1)
 126                         continue;
 127
 128                 list_del(ptr);
 129                 kfree(map);
 130         }
 131         mutex_unlock(&table_lock);
 132 }
 133 EXPORT_SYMBOL_GPL(adf_clean_vf_map);
 134
 135 /**
 136  * adf_devmgr_update_class_index() - Update internal index
 137  * @hw_data:  Pointer to internal device data.
 138  *
 139  * Function updates internal dev index for VFs
 140  */
 141 void adf_devmgr_update_class_index(struct adf_hw_device_data *hw_data)
 142 {
 143         struct adf_hw_device_class *class = hw_data->dev_class;
 144         struct list_head *itr;
 145         int i = 0;
 146
 147         list_for_each(itr, &accel_table) {
 148                 struct adf_accel_dev *ptr =
 149                                 list_entry(itr, struct adf_accel_dev, list);
 150
 151                 if (ptr->hw_device->dev_class == class)
 152                         ptr->hw_device->instance_id = i++;
 153
 154                 if (i == class->instances)
 155                                 break;
 156         }
 157 }
 158 EXPORT_SYMBOL_GPL(adf_devmgr_update_class_index);
 159
 160 static unsigned int adf_find_free_id(void)
 161 {
 162         unsigned int i;
 163
 164         for (i = 0; i < ADF_MAX_DEVICES; i++) {
 165                 if (!id_map[i]) {
 166                         id_map[i] = 1;
 167                         return i;
 168                 }
 169         }
 170         return ADF_MAX_DEVICES + 1;
 171 }
 172
 173 /**
 174  * adf_devmgr_add_dev() - Add accel_dev to the acceleration framework
 175  * @accel_dev:  Pointer to acceleration device.
 176  * @pf:         Corresponding PF if the accel_dev is a VF
 177  *
 178  * Function adds acceleration device to the acceleration framework.
 179  * To be used by QAT device specific drivers.
 180  *
 181  * Return: 0 on success, error code otherwise.
 182  */
 183 int adf_devmgr_add_dev(struct adf_accel_dev *accel_dev,
 184                        struct adf_accel_dev *pf)
 185 {
 186         struct list_head *itr;
 187         int ret = 0;
 188
 189         if (num_devices == ADF_MAX_DEVICES) {
 190                 dev_err(&GET_DEV(accel_dev), "Only support up to %d devices\n",
 191                         ADF_MAX_DEVICES);
 192                 return -EFAULT;
 193         }
 194
 195         mutex_lock(&table_lock);
 196         atomic_set(&accel_dev->ref_count, 0);
 197
 198         /* PF on host or VF on guest */
 199         if (!accel_dev->is_vf || (accel_dev->is_vf && !pf)) {
 200                 struct vf_id_map *map;
 201
 202                 list_for_each(itr, &accel_table) {
 203                         struct adf_accel_dev *ptr =
 204                                 list_entry(itr, struct adf_accel_dev, list);
 205
 206                         if (ptr == accel_dev) {
 207                                 ret = -EEXIST;
 208                                 goto unlock;
 209                         }
 210                 }
 211
 212                 list_add_tail(&accel_dev->list, &accel_table);
 213                 accel_dev->accel_id = adf_find_free_id();
 214                 if (accel_dev->accel_id > ADF_MAX_DEVICES) {
 215                         ret = -EFAULT;
 216                         goto unlock;
 217                 }
 218                 num_devices++;
 219                 map = kzalloc(sizeof(*map), GFP_KERNEL);
 220                 if (!map) {
 221                         ret = -ENOMEM;
 222                         goto unlock;
 223                 }
 224                 map->bdf = ~0;
 225                 map->id = accel_dev->accel_id;
 226                 map->fake_id = map->id;
 227                 map->attached = true;
 228                 list_add_tail(&map->list, &vfs_table);
 229         } else if (accel_dev->is_vf && pf) {
 230                 /* VF on host */
 231                 struct adf_accel_vf_info *vf_info;
 232                 struct vf_id_map *map;
 233
 234                 vf_info = pf->pf.vf_info + adf_get_vf_id(accel_dev);
 235
 236                 map = adf_find_vf(adf_get_vf_num(accel_dev));
 237                 if (map) {
 238                         struct vf_id_map *next;
 239
 240                         accel_dev->accel_id = map->id;
 241                         list_add_tail(&accel_dev->list, &accel_table);
 242                         map->fake_id++;
 243                         map->attached = true;
 244                         next = list_next_entry(map, list);
 245                         while (next && &next->list != &vfs_table) {
 246                                 next->fake_id++;
 247                                 next = list_next_entry(next, list);
 248                         }
 249
 250                         ret = 0;
 251                         goto unlock;
 252                 }
 253
 254                 map = kzalloc(sizeof(*map), GFP_KERNEL);
 255                 if (!map) {
 256                         ret = -ENOMEM;
 257                         goto unlock;
 258                 }
 259                 accel_dev->accel_id = adf_find_free_id();
 260                 if (accel_dev->accel_id > ADF_MAX_DEVICES) {
 261                         kfree(map);
 262                         ret = -EFAULT;
 263                         goto unlock;
 264                 }
 265                 num_devices++;
 266                 list_add_tail(&accel_dev->list, &accel_table);
 267                 map->bdf = adf_get_vf_num(accel_dev);
 268                 map->id = accel_dev->accel_id;
 269                 map->fake_id = map->id;
 270                 map->attached = true;
 271                 list_add_tail(&map->list, &vfs_table);
 272         }
 273 unlock:
 274         mutex_unlock(&table_lock);
 275         return ret;
 276 }
 277 EXPORT_SYMBOL_GPL(adf_devmgr_add_dev);
 278
 279 struct list_head *adf_devmgr_get_head(void)
 280 {
 281         return &accel_table;
 282 }
 283
 284 /**
 285  * adf_devmgr_rm_dev() - Remove accel_dev from the acceleration framework.
 286  * @accel_dev:  Pointer to acceleration device.
 287  * @pf:         Corresponding PF if the accel_dev is a VF
 288  *
 289  * Function removes acceleration device from the acceleration framework.
 290  * To be used by QAT device specific drivers.
 291  *
 292  * Return: void
 293  */
 294 void adf_devmgr_rm_dev(struct adf_accel_dev *accel_dev,
 295                        struct adf_accel_dev *pf)
 296 {
 297         mutex_lock(&table_lock);
 298         if (!accel_dev->is_vf || (accel_dev->is_vf && !pf)) {
 299                 id_map[accel_dev->accel_id] = 0;
 300                 num_devices--;
 301         } else if (accel_dev->is_vf && pf) {
 302                 struct vf_id_map *map, *next;
 303
 304                 map = adf_find_vf(adf_get_vf_num(accel_dev));
 305                 if (!map) {
 306                         dev_err(&GET_DEV(accel_dev), "Failed to find VF map\n");
 307                         goto unlock;
 308                 }
 309                 map->fake_id--;
 310                 map->attached = false;
 311                 next = list_next_entry(map, list);
 312                 while (next && &next->list != &vfs_table) {
 313                         next->fake_id--;
 314                         next = list_next_entry(next, list);
 315                 }
 316         }
 317 unlock:
 318         list_del(&accel_dev->list);
 319         mutex_unlock(&table_lock);
 320 }
 321 EXPORT_SYMBOL_GPL(adf_devmgr_rm_dev);
 322
 323 struct adf_accel_dev *adf_devmgr_get_first(void)
 324 {
 325         struct adf_accel_dev *dev = NULL;
 326
 327         if (!list_empty(&accel_table))
 328                 dev = list_first_entry(&accel_table, struct adf_accel_dev,
 329                                        list);
 330         return dev;
 331 }
 332
 333 /**
 334  * adf_devmgr_pci_to_accel_dev() - Get accel_dev associated with the pci_dev.
 335  * @accel_dev:  Pointer to pci device.
 336  *
 337  * Function returns acceleration device associated with the given pci device.
 338  * To be used by QAT device specific drivers.
 339  *
 340  * Return: pointer to accel_dev or NULL if not found.
 341  */
 342 struct adf_accel_dev *adf_devmgr_pci_to_accel_dev(struct pci_dev *pci_dev)
 343 {
 344         struct list_head *itr;
 345
 346         mutex_lock(&table_lock);
 347         list_for_each(itr, &accel_table) {
 348                 struct adf_accel_dev *ptr =
 349                                 list_entry(itr, struct adf_accel_dev, list);
 350
 351                 if (ptr->accel_pci_dev.pci_dev == pci_dev) {
 352                         mutex_unlock(&table_lock);
 353                         return ptr;
 354                 }
 355         }
 356         mutex_unlock(&table_lock);
 357         return NULL;
 358 }
 359 EXPORT_SYMBOL_GPL(adf_devmgr_pci_to_accel_dev);
 360
 361 struct adf_accel_dev *adf_devmgr_get_dev_by_id(uint32_t id)
 362 {
 363         struct list_head *itr;
 364         int real_id;
 365
 366         mutex_lock(&table_lock);
 367         real_id = adf_get_vf_real_id(id);
 368         if (real_id < 0)
 369                 goto unlock;
 370
 371         id = real_id;
 372
 373         list_for_each(itr, &accel_table) {
 374                 struct adf_accel_dev *ptr =
 375                                 list_entry(itr, struct adf_accel_dev, list);
 376                 if (ptr->accel_id == id) {
 377                         mutex_unlock(&table_lock);
 378                         return ptr;
 379                 }
 380         }
 381 unlock:
 382         mutex_unlock(&table_lock);
 383         return NULL;
 384 }
 385
 386 int adf_devmgr_verify_id(uint32_t id)
 387 {
 388         if (id == ADF_CFG_ALL_DEVICES)
 389                 return 0;
 390
 391         if (adf_devmgr_get_dev_by_id(id))
 392                 return 0;
 393
 394         return -ENODEV;
 395 }
 396
 397 static int adf_get_num_dettached_vfs(void)
 398 {
 399         struct list_head *itr;
 400         int vfs = 0;
 401
 402         mutex_lock(&table_lock);
 403         list_for_each(itr, &vfs_table) {
 404                 struct vf_id_map *ptr =
 405                         list_entry(itr, struct vf_id_map, list);
 406                 if (ptr->bdf != ~0 && !ptr->attached)
 407                         vfs++;
 408         }
 409         mutex_unlock(&table_lock);
 410         return vfs;
 411 }
 412
 413 void adf_devmgr_get_num_dev(uint32_t *num)
 414 {
 415         *num = num_devices - adf_get_num_dettached_vfs();
 416 }
 417
 418 /**
 419  * adf_dev_in_use() - Check whether accel_dev is currently in use
 420  * @accel_dev: Pointer to acceleration device.
 421  *
 422  * To be used by QAT device specific drivers.
 423  *
 424  * Return: 1 when device is in use, 0 otherwise.
 425  */
 426 int adf_dev_in_use(struct adf_accel_dev *accel_dev)
 427 {
 428         return atomic_read(&accel_dev->ref_count) != 0;
 429 }
 430 EXPORT_SYMBOL_GPL(adf_dev_in_use);
 431
 432 /**
 433  * adf_dev_get() - Increment accel_dev reference count
 434  * @accel_dev: Pointer to acceleration device.
 435  *
 436  * Increment the accel_dev refcount and if this is the first time
 437  * incrementing it during this period the accel_dev is in use,
 438  * increment the module refcount too.
 439  * To be used by QAT device specific drivers.
 440  *
 441  * Return: 0 when successful, EFAULT when fail to bump module refcount
 442  */
 443 int adf_dev_get(struct adf_accel_dev *accel_dev)
 444 {
 445         if (atomic_add_return(1, &accel_dev->ref_count) == 1)
 446                 if (!try_module_get(accel_dev->owner))
 447                         return -EFAULT;
 448         return 0;
 449 }
 450 EXPORT_SYMBOL_GPL(adf_dev_get);
 451
 452 /**
 453  * adf_dev_put() - Decrement accel_dev reference count
 454  * @accel_dev: Pointer to acceleration device.
 455  *
 456  * Decrement the accel_dev refcount and if this is the last time
 457  * decrementing it during this period the accel_dev is in use,
 458  * decrement the module refcount too.
 459  * To be used by QAT device specific drivers.
 460  *
 461  * Return: void
 462  */
 463 void adf_dev_put(struct adf_accel_dev *accel_dev)
 464 {
 465         if (atomic_sub_return(1, &accel_dev->ref_count) == 0)
 466                 module_put(accel_dev->owner);
 467 }
 468 EXPORT_SYMBOL_GPL(adf_dev_put);
 469
 470 /**
 471  * adf_devmgr_in_reset() - Check whether device is in reset
 472  * @accel_dev: Pointer to acceleration device.
 473  *
 474  * To be used by QAT device specific drivers.
 475  *
 476  * Return: 1 when the device is being reset, 0 otherwise.
 477  */
 478 int adf_devmgr_in_reset(struct adf_accel_dev *accel_dev)
 479 {
 480         return test_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
 481 }
 482 EXPORT_SYMBOL_GPL(adf_devmgr_in_reset);
 483
 484 /**
 485  * adf_dev_started() - Check whether device has started
 486  * @accel_dev: Pointer to acceleration device.
 487  *
 488  * To be used by QAT device specific drivers.
 489  *
 490  * Return: 1 when the device has started, 0 otherwise
 491  */
 492 int adf_dev_started(struct adf_accel_dev *accel_dev)
 493 {
 494         return test_bit(ADF_STATUS_STARTED, &accel_dev->status);
 495 }
 496 EXPORT_SYMBOL_GPL(adf_dev_started);