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 DEFINE_MUTEX(table_lock);
  54 static uint32_t num_devices;
  55
  56 /**
  57  * adf_devmgr_add_dev() - Add accel_dev to the acceleration framework
  58  * @accel_dev:  Pointer to acceleration device.
  59  *
  60  * Function adds acceleration device to the acceleration framework.
  61  * To be used by QAT device specific drivers.
  62  *
  63  * Return: 0 on success, error code otherwise.
  64  */
  65 int adf_devmgr_add_dev(struct adf_accel_dev *accel_dev)
  66 {
  67         struct list_head *itr;
  68
  69         if (num_devices == ADF_MAX_DEVICES) {
  70                 dev_err(&GET_DEV(accel_dev), "Only support up to %d devices\n",
  71                         ADF_MAX_DEVICES);
  72                 return -EFAULT;
  73         }
  74
  75         mutex_lock(&table_lock);
  76         list_for_each(itr, &accel_table) {
  77                 struct adf_accel_dev *ptr =
  78                                 list_entry(itr, struct adf_accel_dev, list);
  79
  80                 if (ptr == accel_dev) {
  81                         mutex_unlock(&table_lock);
  82                         return -EEXIST;
  83                 }
  84         }
  85         atomic_set(&accel_dev->ref_count, 0);
  86         list_add_tail(&accel_dev->list, &accel_table);
  87         accel_dev->accel_id = num_devices++;
  88         mutex_unlock(&table_lock);
  89         return 0;
  90 }
  91 EXPORT_SYMBOL_GPL(adf_devmgr_add_dev);
  92
  93 struct list_head *adf_devmgr_get_head(void)
  94 {
  95         return &accel_table;
  96 }
  97
  98 /**
  99  * adf_devmgr_rm_dev() - Remove accel_dev from the acceleration framework.
 100  * @accel_dev:  Pointer to acceleration device.
 101  *
 102  * Function removes acceleration device from the acceleration framework.
 103  * To be used by QAT device specific drivers.
 104  *
 105  * Return: void
 106  */
 107 void adf_devmgr_rm_dev(struct adf_accel_dev *accel_dev)
 108 {
 109         mutex_lock(&table_lock);
 110         list_del(&accel_dev->list);
 111         num_devices--;
 112         mutex_unlock(&table_lock);
 113 }
 114 EXPORT_SYMBOL_GPL(adf_devmgr_rm_dev);
 115
 116 struct adf_accel_dev *adf_devmgr_get_first(void)
 117 {
 118         struct adf_accel_dev *dev = NULL;
 119
 120         if (!list_empty(&accel_table))
 121                 dev = list_first_entry(&accel_table, struct adf_accel_dev,
 122                                        list);
 123         return dev;
 124 }
 125
 126 /**
 127  * adf_devmgr_pci_to_accel_dev() - Get accel_dev associated with the pci_dev.
 128  * @accel_dev:  Pointer to pci device.
 129  *
 130  * Function returns acceleration device associated with the given pci device.
 131  * To be used by QAT device specific drivers.
 132  *
 133  * Return: pointer to accel_dev or NULL if not found.
 134  */
 135 struct adf_accel_dev *adf_devmgr_pci_to_accel_dev(struct pci_dev *pci_dev)
 136 {
 137         struct list_head *itr;
 138
 139         mutex_lock(&table_lock);
 140         list_for_each(itr, &accel_table) {
 141                 struct adf_accel_dev *ptr =
 142                                 list_entry(itr, struct adf_accel_dev, list);
 143
 144                 if (ptr->accel_pci_dev.pci_dev == pci_dev) {
 145                         mutex_unlock(&table_lock);
 146                         return ptr;
 147                 }
 148         }
 149         mutex_unlock(&table_lock);
 150         return NULL;
 151 }
 152 EXPORT_SYMBOL_GPL(adf_devmgr_pci_to_accel_dev);
 153
 154 struct adf_accel_dev *adf_devmgr_get_dev_by_id(uint32_t id)
 155 {
 156         struct list_head *itr;
 157
 158         mutex_lock(&table_lock);
 159         list_for_each(itr, &accel_table) {
 160                 struct adf_accel_dev *ptr =
 161                                 list_entry(itr, struct adf_accel_dev, list);
 162
 163                 if (ptr->accel_id == id) {
 164                         mutex_unlock(&table_lock);
 165                         return ptr;
 166                 }
 167         }
 168         mutex_unlock(&table_lock);
 169         return NULL;
 170 }
 171
 172 int adf_devmgr_verify_id(uint32_t id)
 173 {
 174         if (id == ADF_CFG_ALL_DEVICES)
 175                 return 0;
 176
 177         if (adf_devmgr_get_dev_by_id(id))
 178                 return 0;
 179
 180         return -ENODEV;
 181 }
 182
 183 void adf_devmgr_get_num_dev(uint32_t *num)
 184 {
 185         struct list_head *itr;
 186
 187         *num = 0;
 188         list_for_each(itr, &accel_table) {
 189                 (*num)++;
 190         }
 191 }
 192
 193 int adf_dev_in_use(struct adf_accel_dev *accel_dev)
 194 {
 195         return atomic_read(&accel_dev->ref_count) != 0;
 196 }
 197
 198 int adf_dev_get(struct adf_accel_dev *accel_dev)
 199 {
 200         if (atomic_add_return(1, &accel_dev->ref_count) == 1)
 201                 if (!try_module_get(accel_dev->owner))
 202                         return -EFAULT;
 203         return 0;
 204 }
 205
 206 void adf_dev_put(struct adf_accel_dev *accel_dev)
 207 {
 208         if (atomic_sub_return(1, &accel_dev->ref_count) == 0)
 209                 module_put(accel_dev->owner);
 210 }
 211
 212 int adf_devmgr_in_reset(struct adf_accel_dev *accel_dev)
 213 {
 214         return test_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
 215 }
 216
 217 int adf_dev_started(struct adf_accel_dev *accel_dev)
 218 {
 219         return test_bit(ADF_STATUS_STARTED, &accel_dev->status);
 220 }