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 */
adf_devmgr_add_dev(struct adf_accel_dev * accel_dev)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
adf_devmgr_get_head(void)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 */
adf_devmgr_rm_dev(struct adf_accel_dev * accel_dev)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
adf_devmgr_get_first(void)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 */
adf_devmgr_pci_to_accel_dev(struct pci_dev * pci_dev)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
adf_devmgr_get_dev_by_id(uint32_t id)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
adf_devmgr_verify_id(uint32_t id)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
adf_devmgr_get_num_dev(uint32_t * num)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
adf_dev_in_use(struct adf_accel_dev * accel_dev)193 int adf_dev_in_use(struct adf_accel_dev *accel_dev)
194 {
195 return atomic_read(&accel_dev->ref_count) != 0;
196 }
197
adf_dev_get(struct adf_accel_dev * accel_dev)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
adf_dev_put(struct adf_accel_dev * accel_dev)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
adf_devmgr_in_reset(struct adf_accel_dev * accel_dev)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
adf_dev_started(struct adf_accel_dev * accel_dev)217 int adf_dev_started(struct adf_accel_dev *accel_dev)
218 {
219 return test_bit(ADF_STATUS_STARTED, &accel_dev->status);
220 }
221