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 52static LIST_HEAD(accel_table); 53static DEFINE_MUTEX(table_lock); 54static 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 */ 65int 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} 91EXPORT_SYMBOL_GPL(adf_devmgr_add_dev); 92 93struct 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 */ 107void 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} 114EXPORT_SYMBOL_GPL(adf_devmgr_rm_dev); 115 116struct 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 */ 135struct 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} 152EXPORT_SYMBOL_GPL(adf_devmgr_pci_to_accel_dev); 153 154struct 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 172int 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 183void 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 193int adf_dev_in_use(struct adf_accel_dev *accel_dev) 194{ 195 return atomic_read(&accel_dev->ref_count) != 0; 196} 197 198int 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 206void 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 212int adf_devmgr_in_reset(struct adf_accel_dev *accel_dev) 213{ 214 return test_bit(ADF_STATUS_RESTARTING, &accel_dev->status); 215} 216 217int adf_dev_started(struct adf_accel_dev *accel_dev) 218{ 219 return test_bit(ADF_STATUS_STARTED, &accel_dev->status); 220} 221