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