1 // SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
2 /* Copyright(c) 2014 - 2020 Intel Corporation */
3 #include <linux/mutex.h>
4 #include <linux/list.h>
5 #include "adf_cfg.h"
6 #include "adf_common_drv.h"
7
8 static LIST_HEAD(accel_table);
9 static LIST_HEAD(vfs_table);
10 static DEFINE_MUTEX(table_lock);
11 static u32 num_devices;
12 static u8 id_map[ADF_MAX_DEVICES];
13
14 struct vf_id_map {
15 u32 bdf;
16 u32 id;
17 u32 fake_id;
18 bool attached;
19 struct list_head list;
20 };
21
adf_get_vf_id(struct adf_accel_dev * vf)22 static int adf_get_vf_id(struct adf_accel_dev *vf)
23 {
24 return ((7 * (PCI_SLOT(accel_to_pci_dev(vf)->devfn) - 1)) +
25 PCI_FUNC(accel_to_pci_dev(vf)->devfn) +
26 (PCI_SLOT(accel_to_pci_dev(vf)->devfn) - 1));
27 }
28
adf_get_vf_num(struct adf_accel_dev * vf)29 static int adf_get_vf_num(struct adf_accel_dev *vf)
30 {
31 return (accel_to_pci_dev(vf)->bus->number << 8) | adf_get_vf_id(vf);
32 }
33
adf_find_vf(u32 bdf)34 static struct vf_id_map *adf_find_vf(u32 bdf)
35 {
36 struct list_head *itr;
37
38 list_for_each(itr, &vfs_table) {
39 struct vf_id_map *ptr =
40 list_entry(itr, struct vf_id_map, list);
41
42 if (ptr->bdf == bdf)
43 return ptr;
44 }
45 return NULL;
46 }
47
adf_get_vf_real_id(u32 fake)48 static int adf_get_vf_real_id(u32 fake)
49 {
50 struct list_head *itr;
51
52 list_for_each(itr, &vfs_table) {
53 struct vf_id_map *ptr =
54 list_entry(itr, struct vf_id_map, list);
55 if (ptr->fake_id == fake)
56 return ptr->id;
57 }
58 return -1;
59 }
60
61 /**
62 * adf_clean_vf_map() - Cleans VF id mappings
63 * @vf: flag indicating whether mappings is cleaned
64 * for vfs only or for vfs and pfs
65 *
66 * Function cleans internal ids for virtual functions.
67 */
adf_clean_vf_map(bool vf)68 void adf_clean_vf_map(bool vf)
69 {
70 struct vf_id_map *map;
71 struct list_head *ptr, *tmp;
72
73 mutex_lock(&table_lock);
74 list_for_each_safe(ptr, tmp, &vfs_table) {
75 map = list_entry(ptr, struct vf_id_map, list);
76 if (map->bdf != -1) {
77 id_map[map->id] = 0;
78 num_devices--;
79 }
80
81 if (vf && map->bdf == -1)
82 continue;
83
84 list_del(ptr);
85 kfree(map);
86 }
87 mutex_unlock(&table_lock);
88 }
89 EXPORT_SYMBOL_GPL(adf_clean_vf_map);
90
91 /**
92 * adf_devmgr_update_class_index() - Update internal index
93 * @hw_data: Pointer to internal device data.
94 *
95 * Function updates internal dev index for VFs
96 */
adf_devmgr_update_class_index(struct adf_hw_device_data * hw_data)97 void adf_devmgr_update_class_index(struct adf_hw_device_data *hw_data)
98 {
99 struct adf_hw_device_class *class = hw_data->dev_class;
100 struct list_head *itr;
101 int i = 0;
102
103 list_for_each(itr, &accel_table) {
104 struct adf_accel_dev *ptr =
105 list_entry(itr, struct adf_accel_dev, list);
106
107 if (ptr->hw_device->dev_class == class)
108 ptr->hw_device->instance_id = i++;
109
110 if (i == class->instances)
111 break;
112 }
113 }
114 EXPORT_SYMBOL_GPL(adf_devmgr_update_class_index);
115
adf_find_free_id(void)116 static unsigned int adf_find_free_id(void)
117 {
118 unsigned int i;
119
120 for (i = 0; i < ADF_MAX_DEVICES; i++) {
121 if (!id_map[i]) {
122 id_map[i] = 1;
123 return i;
124 }
125 }
126 return ADF_MAX_DEVICES + 1;
127 }
128
129 /**
130 * adf_devmgr_add_dev() - Add accel_dev to the acceleration framework
131 * @accel_dev: Pointer to acceleration device.
132 * @pf: Corresponding PF if the accel_dev is a VF
133 *
134 * Function adds acceleration device to the acceleration framework.
135 * To be used by QAT device specific drivers.
136 *
137 * Return: 0 on success, error code otherwise.
138 */
adf_devmgr_add_dev(struct adf_accel_dev * accel_dev,struct adf_accel_dev * pf)139 int adf_devmgr_add_dev(struct adf_accel_dev *accel_dev,
140 struct adf_accel_dev *pf)
141 {
142 struct list_head *itr;
143 int ret = 0;
144
145 if (num_devices == ADF_MAX_DEVICES) {
146 dev_err(&GET_DEV(accel_dev), "Only support up to %d devices\n",
147 ADF_MAX_DEVICES);
148 return -EFAULT;
149 }
150
151 mutex_lock(&table_lock);
152 atomic_set(&accel_dev->ref_count, 0);
153
154 /* PF on host or VF on guest - optimized to remove redundant is_vf */
155 if (!accel_dev->is_vf || !pf) {
156 struct vf_id_map *map;
157
158 list_for_each(itr, &accel_table) {
159 struct adf_accel_dev *ptr =
160 list_entry(itr, struct adf_accel_dev, list);
161
162 if (ptr == accel_dev) {
163 ret = -EEXIST;
164 goto unlock;
165 }
166 }
167
168 list_add_tail(&accel_dev->list, &accel_table);
169 accel_dev->accel_id = adf_find_free_id();
170 if (accel_dev->accel_id > ADF_MAX_DEVICES) {
171 ret = -EFAULT;
172 goto unlock;
173 }
174 num_devices++;
175 map = kzalloc(sizeof(*map), GFP_KERNEL);
176 if (!map) {
177 ret = -ENOMEM;
178 goto unlock;
179 }
180 map->bdf = ~0;
181 map->id = accel_dev->accel_id;
182 map->fake_id = map->id;
183 map->attached = true;
184 list_add_tail(&map->list, &vfs_table);
185 } else if (accel_dev->is_vf && pf) {
186 /* VF on host */
187 struct vf_id_map *map;
188
189 map = adf_find_vf(adf_get_vf_num(accel_dev));
190 if (map) {
191 struct vf_id_map *next;
192
193 accel_dev->accel_id = map->id;
194 list_add_tail(&accel_dev->list, &accel_table);
195 map->fake_id++;
196 map->attached = true;
197 next = list_next_entry(map, list);
198 while (next && &next->list != &vfs_table) {
199 next->fake_id++;
200 next = list_next_entry(next, list);
201 }
202
203 ret = 0;
204 goto unlock;
205 }
206
207 map = kzalloc(sizeof(*map), GFP_KERNEL);
208 if (!map) {
209 ret = -ENOMEM;
210 goto unlock;
211 }
212 accel_dev->accel_id = adf_find_free_id();
213 if (accel_dev->accel_id > ADF_MAX_DEVICES) {
214 kfree(map);
215 ret = -EFAULT;
216 goto unlock;
217 }
218 num_devices++;
219 list_add_tail(&accel_dev->list, &accel_table);
220 map->bdf = adf_get_vf_num(accel_dev);
221 map->id = accel_dev->accel_id;
222 map->fake_id = map->id;
223 map->attached = true;
224 list_add_tail(&map->list, &vfs_table);
225 }
226 mutex_init(&accel_dev->state_lock);
227 unlock:
228 mutex_unlock(&table_lock);
229 return ret;
230 }
231 EXPORT_SYMBOL_GPL(adf_devmgr_add_dev);
232
adf_devmgr_get_head(void)233 struct list_head *adf_devmgr_get_head(void)
234 {
235 return &accel_table;
236 }
237
238 /**
239 * adf_devmgr_rm_dev() - Remove accel_dev from the acceleration framework.
240 * @accel_dev: Pointer to acceleration device.
241 * @pf: Corresponding PF if the accel_dev is a VF
242 *
243 * Function removes acceleration device from the acceleration framework.
244 * To be used by QAT device specific drivers.
245 *
246 * Return: void
247 */
adf_devmgr_rm_dev(struct adf_accel_dev * accel_dev,struct adf_accel_dev * pf)248 void adf_devmgr_rm_dev(struct adf_accel_dev *accel_dev,
249 struct adf_accel_dev *pf)
250 {
251 mutex_lock(&table_lock);
252 /* PF on host or VF on guest - optimized to remove redundant is_vf */
253 if (!accel_dev->is_vf || !pf) {
254 id_map[accel_dev->accel_id] = 0;
255 num_devices--;
256 } else if (accel_dev->is_vf && pf) {
257 struct vf_id_map *map, *next;
258
259 map = adf_find_vf(adf_get_vf_num(accel_dev));
260 if (!map) {
261 dev_err(&GET_DEV(accel_dev), "Failed to find VF map\n");
262 goto unlock;
263 }
264 map->fake_id--;
265 map->attached = false;
266 next = list_next_entry(map, list);
267 while (next && &next->list != &vfs_table) {
268 next->fake_id--;
269 next = list_next_entry(next, list);
270 }
271 }
272 unlock:
273 mutex_destroy(&accel_dev->state_lock);
274 list_del(&accel_dev->list);
275 mutex_unlock(&table_lock);
276 }
277 EXPORT_SYMBOL_GPL(adf_devmgr_rm_dev);
278
adf_devmgr_get_first(void)279 struct adf_accel_dev *adf_devmgr_get_first(void)
280 {
281 struct adf_accel_dev *dev = NULL;
282
283 if (!list_empty(&accel_table))
284 dev = list_first_entry(&accel_table, struct adf_accel_dev,
285 list);
286 return dev;
287 }
288
289 /**
290 * adf_devmgr_pci_to_accel_dev() - Get accel_dev associated with the pci_dev.
291 * @pci_dev: Pointer to PCI device.
292 *
293 * Function returns acceleration device associated with the given PCI device.
294 * To be used by QAT device specific drivers.
295 *
296 * Return: pointer to accel_dev or NULL if not found.
297 */
adf_devmgr_pci_to_accel_dev(struct pci_dev * pci_dev)298 struct adf_accel_dev *adf_devmgr_pci_to_accel_dev(struct pci_dev *pci_dev)
299 {
300 struct list_head *itr;
301
302 mutex_lock(&table_lock);
303 list_for_each(itr, &accel_table) {
304 struct adf_accel_dev *ptr =
305 list_entry(itr, struct adf_accel_dev, list);
306
307 if (ptr->accel_pci_dev.pci_dev == pci_dev) {
308 mutex_unlock(&table_lock);
309 return ptr;
310 }
311 }
312 mutex_unlock(&table_lock);
313 return NULL;
314 }
315 EXPORT_SYMBOL_GPL(adf_devmgr_pci_to_accel_dev);
316
adf_devmgr_get_dev_by_id(u32 id)317 struct adf_accel_dev *adf_devmgr_get_dev_by_id(u32 id)
318 {
319 struct list_head *itr;
320 int real_id;
321
322 mutex_lock(&table_lock);
323 real_id = adf_get_vf_real_id(id);
324 if (real_id < 0)
325 goto unlock;
326
327 id = real_id;
328
329 list_for_each(itr, &accel_table) {
330 struct adf_accel_dev *ptr =
331 list_entry(itr, struct adf_accel_dev, list);
332 if (ptr->accel_id == id) {
333 mutex_unlock(&table_lock);
334 return ptr;
335 }
336 }
337 unlock:
338 mutex_unlock(&table_lock);
339 return NULL;
340 }
341
adf_devmgr_verify_id(u32 id)342 int adf_devmgr_verify_id(u32 id)
343 {
344 if (id == ADF_CFG_ALL_DEVICES)
345 return 0;
346
347 if (adf_devmgr_get_dev_by_id(id))
348 return 0;
349
350 return -ENODEV;
351 }
352
adf_get_num_dettached_vfs(void)353 static int adf_get_num_dettached_vfs(void)
354 {
355 struct list_head *itr;
356 int vfs = 0;
357
358 mutex_lock(&table_lock);
359 list_for_each(itr, &vfs_table) {
360 struct vf_id_map *ptr =
361 list_entry(itr, struct vf_id_map, list);
362 if (ptr->bdf != ~0 && !ptr->attached)
363 vfs++;
364 }
365 mutex_unlock(&table_lock);
366 return vfs;
367 }
368
adf_devmgr_get_num_dev(u32 * num)369 void adf_devmgr_get_num_dev(u32 *num)
370 {
371 *num = num_devices - adf_get_num_dettached_vfs();
372 }
373
374 /**
375 * adf_dev_in_use() - Check whether accel_dev is currently in use
376 * @accel_dev: Pointer to acceleration device.
377 *
378 * To be used by QAT device specific drivers.
379 *
380 * Return: 1 when device is in use, 0 otherwise.
381 */
adf_dev_in_use(struct adf_accel_dev * accel_dev)382 int adf_dev_in_use(struct adf_accel_dev *accel_dev)
383 {
384 return atomic_read(&accel_dev->ref_count) != 0;
385 }
386 EXPORT_SYMBOL_GPL(adf_dev_in_use);
387
388 /**
389 * adf_dev_get() - Increment accel_dev reference count
390 * @accel_dev: Pointer to acceleration device.
391 *
392 * Increment the accel_dev refcount and if this is the first time
393 * incrementing it during this period the accel_dev is in use,
394 * increment the module refcount too.
395 * To be used by QAT device specific drivers.
396 *
397 * Return: 0 when successful, EFAULT when fail to bump module refcount
398 */
adf_dev_get(struct adf_accel_dev * accel_dev)399 int adf_dev_get(struct adf_accel_dev *accel_dev)
400 {
401 if (atomic_add_return(1, &accel_dev->ref_count) == 1)
402 if (!try_module_get(accel_dev->owner))
403 return -EFAULT;
404 return 0;
405 }
406 EXPORT_SYMBOL_GPL(adf_dev_get);
407
408 /**
409 * adf_dev_put() - Decrement accel_dev reference count
410 * @accel_dev: Pointer to acceleration device.
411 *
412 * Decrement the accel_dev refcount and if this is the last time
413 * decrementing it during this period the accel_dev is in use,
414 * decrement the module refcount too.
415 * To be used by QAT device specific drivers.
416 *
417 * Return: void
418 */
adf_dev_put(struct adf_accel_dev * accel_dev)419 void adf_dev_put(struct adf_accel_dev *accel_dev)
420 {
421 if (atomic_sub_return(1, &accel_dev->ref_count) == 0)
422 module_put(accel_dev->owner);
423 }
424 EXPORT_SYMBOL_GPL(adf_dev_put);
425
426 /**
427 * adf_devmgr_in_reset() - Check whether device is in reset
428 * @accel_dev: Pointer to acceleration device.
429 *
430 * To be used by QAT device specific drivers.
431 *
432 * Return: 1 when the device is being reset, 0 otherwise.
433 */
adf_devmgr_in_reset(struct adf_accel_dev * accel_dev)434 int adf_devmgr_in_reset(struct adf_accel_dev *accel_dev)
435 {
436 return test_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
437 }
438 EXPORT_SYMBOL_GPL(adf_devmgr_in_reset);
439
440 /**
441 * adf_dev_started() - Check whether device has started
442 * @accel_dev: Pointer to acceleration device.
443 *
444 * To be used by QAT device specific drivers.
445 *
446 * Return: 1 when the device has started, 0 otherwise
447 */
adf_dev_started(struct adf_accel_dev * accel_dev)448 int adf_dev_started(struct adf_accel_dev *accel_dev)
449 {
450 return test_bit(ADF_STATUS_STARTED, &accel_dev->status);
451 }
452 EXPORT_SYMBOL_GPL(adf_dev_started);
453