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 vf_id_map *map;
 232
 233                 map = adf_find_vf(adf_get_vf_num(accel_dev));
 234                 if (map) {
 235                         struct vf_id_map *next;
 236
 237                         accel_dev->accel_id = map->id;
 238                         list_add_tail(&accel_dev->list, &accel_table);
 239                         map->fake_id++;
 240                         map->attached = true;
 241                         next = list_next_entry(map, list);
 242                         while (next && &next->list != &vfs_table) {
 243                                 next->fake_id++;
 244                                 next = list_next_entry(next, list);
 245                         }
 246
 247                         ret = 0;
 248                         goto unlock;
 249                 }
 250
 251                 map = kzalloc(sizeof(*map), GFP_KERNEL);
 252                 if (!map) {
 253                         ret = -ENOMEM;
 254                         goto unlock;
 255                 }
 256                 accel_dev->accel_id = adf_find_free_id();
 257                 if (accel_dev->accel_id > ADF_MAX_DEVICES) {
 258                         kfree(map);
 259                         ret = -EFAULT;
 260                         goto unlock;
 261                 }
 262                 num_devices++;
 263                 list_add_tail(&accel_dev->list, &accel_table);
 264                 map->bdf = adf_get_vf_num(accel_dev);
 265                 map->id = accel_dev->accel_id;
 266                 map->fake_id = map->id;
 267                 map->attached = true;
 268                 list_add_tail(&map->list, &vfs_table);
 269         }
 270 unlock:
 271         mutex_unlock(&table_lock);
 272         return ret;
 273 }
 274 EXPORT_SYMBOL_GPL(adf_devmgr_add_dev);
 275
 276 struct list_head *adf_devmgr_get_head(void)
 277 {
 278         return &accel_table;
 279 }
 280
 281 /**
 282  * adf_devmgr_rm_dev() - Remove accel_dev from the acceleration framework.
 283  * @accel_dev:  Pointer to acceleration device.
 284  * @pf:         Corresponding PF if the accel_dev is a VF
 285  *
 286  * Function removes acceleration device from the acceleration framework.
 287  * To be used by QAT device specific drivers.
 288  *
 289  * Return: void
 290  */
 291 void adf_devmgr_rm_dev(struct adf_accel_dev *accel_dev,
 292                        struct adf_accel_dev *pf)
 293 {
 294         mutex_lock(&table_lock);
 295         if (!accel_dev->is_vf || (accel_dev->is_vf && !pf)) {
 296                 id_map[accel_dev->accel_id] = 0;
 297                 num_devices--;
 298         } else if (accel_dev->is_vf && pf) {
 299                 struct vf_id_map *map, *next;
 300
 301                 map = adf_find_vf(adf_get_vf_num(accel_dev));
 302                 if (!map) {
 303                         dev_err(&GET_DEV(accel_dev), "Failed to find VF map\n");
 304                         goto unlock;
 305                 }
 306                 map->fake_id--;
 307                 map->attached = false;
 308                 next = list_next_entry(map, list);
 309                 while (next && &next->list != &vfs_table) {
 310                         next->fake_id--;
 311                         next = list_next_entry(next, list);
 312                 }
 313         }
 314 unlock:
 315         list_del(&accel_dev->list);
 316         mutex_unlock(&table_lock);
 317 }
 318 EXPORT_SYMBOL_GPL(adf_devmgr_rm_dev);
 319
 320 struct adf_accel_dev *adf_devmgr_get_first(void)
 321 {
 322         struct adf_accel_dev *dev = NULL;
 323
 324         if (!list_empty(&accel_table))
 325                 dev = list_first_entry(&accel_table, struct adf_accel_dev,
 326                                        list);
 327         return dev;
 328 }
 329
 330 /**
 331  * adf_devmgr_pci_to_accel_dev() - Get accel_dev associated with the pci_dev.
 332  * @accel_dev:  Pointer to pci device.
 333  *
 334  * Function returns acceleration device associated with the given pci device.
 335  * To be used by QAT device specific drivers.
 336  *
 337  * Return: pointer to accel_dev or NULL if not found.
 338  */
 339 struct adf_accel_dev *adf_devmgr_pci_to_accel_dev(struct pci_dev *pci_dev)
 340 {
 341         struct list_head *itr;
 342
 343         mutex_lock(&table_lock);
 344         list_for_each(itr, &accel_table) {
 345                 struct adf_accel_dev *ptr =
 346                                 list_entry(itr, struct adf_accel_dev, list);
 347
 348                 if (ptr->accel_pci_dev.pci_dev == pci_dev) {
 349                         mutex_unlock(&table_lock);
 350                         return ptr;
 351                 }
 352         }
 353         mutex_unlock(&table_lock);
 354         return NULL;
 355 }
 356 EXPORT_SYMBOL_GPL(adf_devmgr_pci_to_accel_dev);
 357
 358 struct adf_accel_dev *adf_devmgr_get_dev_by_id(uint32_t id)
 359 {
 360         struct list_head *itr;
 361         int real_id;
 362
 363         mutex_lock(&table_lock);
 364         real_id = adf_get_vf_real_id(id);
 365         if (real_id < 0)
 366                 goto unlock;
 367
 368         id = real_id;
 369
 370         list_for_each(itr, &accel_table) {
 371                 struct adf_accel_dev *ptr =
 372                                 list_entry(itr, struct adf_accel_dev, list);
 373                 if (ptr->accel_id == id) {
 374                         mutex_unlock(&table_lock);
 375                         return ptr;
 376                 }
 377         }
 378 unlock:
 379         mutex_unlock(&table_lock);
 380         return NULL;
 381 }
 382
 383 int adf_devmgr_verify_id(uint32_t id)
 384 {
 385         if (id == ADF_CFG_ALL_DEVICES)
 386                 return 0;
 387
 388         if (adf_devmgr_get_dev_by_id(id))
 389                 return 0;
 390
 391         return -ENODEV;
 392 }
 393
 394 static int adf_get_num_dettached_vfs(void)
 395 {
 396         struct list_head *itr;
 397         int vfs = 0;
 398
 399         mutex_lock(&table_lock);
 400         list_for_each(itr, &vfs_table) {
 401                 struct vf_id_map *ptr =
 402                         list_entry(itr, struct vf_id_map, list);
 403                 if (ptr->bdf != ~0 && !ptr->attached)
 404                         vfs++;
 405         }
 406         mutex_unlock(&table_lock);
 407         return vfs;
 408 }
 409
 410 void adf_devmgr_get_num_dev(uint32_t *num)
 411 {
 412         *num = num_devices - adf_get_num_dettached_vfs();
 413 }
 414
 415 /**
 416  * adf_dev_in_use() - Check whether accel_dev is currently in use
 417  * @accel_dev: Pointer to acceleration device.
 418  *
 419  * To be used by QAT device specific drivers.
 420  *
 421  * Return: 1 when device is in use, 0 otherwise.
 422  */
 423 int adf_dev_in_use(struct adf_accel_dev *accel_dev)
 424 {
 425         return atomic_read(&accel_dev->ref_count) != 0;
 426 }
 427 EXPORT_SYMBOL_GPL(adf_dev_in_use);
 428
 429 /**
 430  * adf_dev_get() - Increment accel_dev reference count
 431  * @accel_dev: Pointer to acceleration device.
 432  *
 433  * Increment the accel_dev refcount and if this is the first time
 434  * incrementing it during this period the accel_dev is in use,
 435  * increment the module refcount too.
 436  * To be used by QAT device specific drivers.
 437  *
 438  * Return: 0 when successful, EFAULT when fail to bump module refcount
 439  */
 440 int adf_dev_get(struct adf_accel_dev *accel_dev)
 441 {
 442         if (atomic_add_return(1, &accel_dev->ref_count) == 1)
 443                 if (!try_module_get(accel_dev->owner))
 444                         return -EFAULT;
 445         return 0;
 446 }
 447 EXPORT_SYMBOL_GPL(adf_dev_get);
 448
 449 /**
 450  * adf_dev_put() - Decrement accel_dev reference count
 451  * @accel_dev: Pointer to acceleration device.
 452  *
 453  * Decrement the accel_dev refcount and if this is the last time
 454  * decrementing it during this period the accel_dev is in use,
 455  * decrement the module refcount too.
 456  * To be used by QAT device specific drivers.
 457  *
 458  * Return: void
 459  */
 460 void adf_dev_put(struct adf_accel_dev *accel_dev)
 461 {
 462         if (atomic_sub_return(1, &accel_dev->ref_count) == 0)
 463                 module_put(accel_dev->owner);
 464 }
 465 EXPORT_SYMBOL_GPL(adf_dev_put);
 466
 467 /**
 468  * adf_devmgr_in_reset() - Check whether device is in reset
 469  * @accel_dev: Pointer to acceleration device.
 470  *
 471  * To be used by QAT device specific drivers.
 472  *
 473  * Return: 1 when the device is being reset, 0 otherwise.
 474  */
 475 int adf_devmgr_in_reset(struct adf_accel_dev *accel_dev)
 476 {
 477         return test_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
 478 }
 479 EXPORT_SYMBOL_GPL(adf_devmgr_in_reset);
 480
 481 /**
 482  * adf_dev_started() - Check whether device has started
 483  * @accel_dev: Pointer to acceleration device.
 484  *
 485  * To be used by QAT device specific drivers.
 486  *
 487  * Return: 1 when the device has started, 0 otherwise
 488  */
 489 int adf_dev_started(struct adf_accel_dev *accel_dev)
 490 {
 491         return test_bit(ADF_STATUS_STARTED, &accel_dev->status);
 492 }
 493 EXPORT_SYMBOL_GPL(adf_dev_started);