summaryrefslogtreecommitdiff
path: root/drivers/crypto/qat/qat_common/adf_dev_mgr.c
blob: 72753af056b3edbe93bbfaa1e1eb1651632db7b5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
/* Copyright(c) 2014 - 2020 Intel Corporation */
#include <linux/mutex.h>
#include <linux/list.h>
#include "adf_cfg.h"
#include "adf_common_drv.h"

static LIST_HEAD(accel_table);
static LIST_HEAD(vfs_table);
static DEFINE_MUTEX(table_lock);
static u32 num_devices;
static u8 id_map[ADF_MAX_DEVICES];

struct vf_id_map {
	u32 bdf;
	u32 id;
	u32 fake_id;
	bool attached;
	struct list_head list;
};

static int adf_get_vf_id(struct adf_accel_dev *vf)
{
	return ((7 * (PCI_SLOT(accel_to_pci_dev(vf)->devfn) - 1)) +
		PCI_FUNC(accel_to_pci_dev(vf)->devfn) +
		(PCI_SLOT(accel_to_pci_dev(vf)->devfn) - 1));
}

static int adf_get_vf_num(struct adf_accel_dev *vf)
{
	return (accel_to_pci_dev(vf)->bus->number << 8) | adf_get_vf_id(vf);
}

static struct vf_id_map *adf_find_vf(u32 bdf)
{
	struct list_head *itr;

	list_for_each(itr, &vfs_table) {
		struct vf_id_map *ptr =
			list_entry(itr, struct vf_id_map, list);

		if (ptr->bdf == bdf)
			return ptr;
	}
	return NULL;
}

static int adf_get_vf_real_id(u32 fake)
{
	struct list_head *itr;

	list_for_each(itr, &vfs_table) {
		struct vf_id_map *ptr =
			list_entry(itr, struct vf_id_map, list);
		if (ptr->fake_id == fake)
			return ptr->id;
	}
	return -1;
}

/**
 * adf_clean_vf_map() - Cleans VF id mapings
 *
 * Function cleans internal ids for virtual functions.
 * @vf: flag indicating whether mappings is cleaned
 *	for vfs only or for vfs and pfs
 */
void adf_clean_vf_map(bool vf)
{
	struct vf_id_map *map;
	struct list_head *ptr, *tmp;

	mutex_lock(&table_lock);
	list_for_each_safe(ptr, tmp, &vfs_table) {
		map = list_entry(ptr, struct vf_id_map, list);
		if (map->bdf != -1) {
			id_map[map->id] = 0;
			num_devices--;
		}

		if (vf && map->bdf == -1)
			continue;

		list_del(ptr);
		kfree(map);
	}
	mutex_unlock(&table_lock);
}
EXPORT_SYMBOL_GPL(adf_clean_vf_map);

/**
 * adf_devmgr_update_class_index() - Update internal index
 * @hw_data:  Pointer to internal device data.
 *
 * Function updates internal dev index for VFs
 */
void adf_devmgr_update_class_index(struct adf_hw_device_data *hw_data)
{
	struct adf_hw_device_class *class = hw_data->dev_class;
	struct list_head *itr;
	int i = 0;

	list_for_each(itr, &accel_table) {
		struct adf_accel_dev *ptr =
				list_entry(itr, struct adf_accel_dev, list);

		if (ptr->hw_device->dev_class == class)
			ptr->hw_device->instance_id = i++;

		if (i == class->instances)
			break;
	}
}
EXPORT_SYMBOL_GPL(adf_devmgr_update_class_index);

static unsigned int adf_find_free_id(void)
{
	unsigned int i;

	for (i = 0; i < ADF_MAX_DEVICES; i++) {
		if (!id_map[i]) {
			id_map[i] = 1;
			return i;
		}
	}
	return ADF_MAX_DEVICES + 1;
}

/**
 * adf_devmgr_add_dev() - Add accel_dev to the acceleration framework
 * @accel_dev:  Pointer to acceleration device.
 * @pf:		Corresponding PF if the accel_dev is a VF
 *
 * Function adds acceleration device to the acceleration framework.
 * To be used by QAT device specific drivers.
 *
 * Return: 0 on success, error code otherwise.
 */
int adf_devmgr_add_dev(struct adf_accel_dev *accel_dev,
		       struct adf_accel_dev *pf)
{
	struct list_head *itr;
	int ret = 0;

	if (num_devices == ADF_MAX_DEVICES) {
		dev_err(&GET_DEV(accel_dev), "Only support up to %d devices\n",
			ADF_MAX_DEVICES);
		return -EFAULT;
	}

	mutex_lock(&table_lock);
	atomic_set(&accel_dev->ref_count, 0);

	/* PF on host or VF on guest */
	if (!accel_dev->is_vf || (accel_dev->is_vf && !pf)) {
		struct vf_id_map *map;

		list_for_each(itr, &accel_table) {
			struct adf_accel_dev *ptr =
				list_entry(itr, struct adf_accel_dev, list);

			if (ptr == accel_dev) {
				ret = -EEXIST;
				goto unlock;
			}
		}

		list_add_tail(&accel_dev->list, &accel_table);
		accel_dev->accel_id = adf_find_free_id();
		if (accel_dev->accel_id > ADF_MAX_DEVICES) {
			ret = -EFAULT;
			goto unlock;
		}
		num_devices++;
		map = kzalloc(sizeof(*map), GFP_KERNEL);
		if (!map) {
			ret = -ENOMEM;
			goto unlock;
		}
		map->bdf = ~0;
		map->id = accel_dev->accel_id;
		map->fake_id = map->id;
		map->attached = true;
		list_add_tail(&map->list, &vfs_table);
	} else if (accel_dev->is_vf && pf) {
		/* VF on host */
		struct vf_id_map *map;

		map = adf_find_vf(adf_get_vf_num(accel_dev));
		if (map) {
			struct vf_id_map *next;

			accel_dev->accel_id = map->id;
			list_add_tail(&accel_dev->list, &accel_table);
			map->fake_id++;
			map->attached = true;
			next = list_next_entry(map, list);
			while (next && &next->list != &vfs_table) {
				next->fake_id++;
				next = list_next_entry(next, list);
			}

			ret = 0;
			goto unlock;
		}

		map = kzalloc(sizeof(*map), GFP_KERNEL);
		if (!map) {
			ret = -ENOMEM;
			goto unlock;
		}
		accel_dev->accel_id = adf_find_free_id();
		if (accel_dev->accel_id > ADF_MAX_DEVICES) {
			kfree(map);
			ret = -EFAULT;
			goto unlock;
		}
		num_devices++;
		list_add_tail(&accel_dev->list, &accel_table);
		map->bdf = adf_get_vf_num(accel_dev);
		map->id = accel_dev->accel_id;
		map->fake_id = map->id;
		map->attached = true;
		list_add_tail(&map->list, &vfs_table);
	}
unlock:
	mutex_unlock(&table_lock);
	return ret;
}
EXPORT_SYMBOL_GPL(adf_devmgr_add_dev);

struct list_head *adf_devmgr_get_head(void)
{
	return &accel_table;
}

/**
 * adf_devmgr_rm_dev() - Remove accel_dev from the acceleration framework.
 * @accel_dev:  Pointer to acceleration device.
 * @pf:		Corresponding PF if the accel_dev is a VF
 *
 * Function removes acceleration device from the acceleration framework.
 * To be used by QAT device specific drivers.
 *
 * Return: void
 */
void adf_devmgr_rm_dev(struct adf_accel_dev *accel_dev,
		       struct adf_accel_dev *pf)
{
	mutex_lock(&table_lock);
	if (!accel_dev->is_vf || (accel_dev->is_vf && !pf)) {
		id_map[accel_dev->accel_id] = 0;
		num_devices--;
	} else if (accel_dev->is_vf && pf) {
		struct vf_id_map *map, *next;

		map = adf_find_vf(adf_get_vf_num(accel_dev));
		if (!map) {
			dev_err(&GET_DEV(accel_dev), "Failed to find VF map\n");
			goto unlock;
		}
		map->fake_id--;
		map->attached = false;
		next = list_next_entry(map, list);
		while (next && &next->list != &vfs_table) {
			next->fake_id--;
			next = list_next_entry(next, list);
		}
	}
unlock:
	list_del(&accel_dev->list);
	mutex_unlock(&table_lock);
}
EXPORT_SYMBOL_GPL(adf_devmgr_rm_dev);

struct adf_accel_dev *adf_devmgr_get_first(void)
{
	struct adf_accel_dev *dev = NULL;

	if (!list_empty(&accel_table))
		dev = list_first_entry(&accel_table, struct adf_accel_dev,
				       list);
	return dev;
}

/**
 * adf_devmgr_pci_to_accel_dev() - Get accel_dev associated with the pci_dev.
 * @accel_dev:  Pointer to pci device.
 *
 * Function returns acceleration device associated with the given pci device.
 * To be used by QAT device specific drivers.
 *
 * Return: pointer to accel_dev or NULL if not found.
 */
struct adf_accel_dev *adf_devmgr_pci_to_accel_dev(struct pci_dev *pci_dev)
{
	struct list_head *itr;

	mutex_lock(&table_lock);
	list_for_each(itr, &accel_table) {
		struct adf_accel_dev *ptr =
				list_entry(itr, struct adf_accel_dev, list);

		if (ptr->accel_pci_dev.pci_dev == pci_dev) {
			mutex_unlock(&table_lock);
			return ptr;
		}
	}
	mutex_unlock(&table_lock);
	return NULL;
}
EXPORT_SYMBOL_GPL(adf_devmgr_pci_to_accel_dev);

struct adf_accel_dev *adf_devmgr_get_dev_by_id(u32 id)
{
	struct list_head *itr;
	int real_id;

	mutex_lock(&table_lock);
	real_id = adf_get_vf_real_id(id);
	if (real_id < 0)
		goto unlock;

	id = real_id;

	list_for_each(itr, &accel_table) {
		struct adf_accel_dev *ptr =
				list_entry(itr, struct adf_accel_dev, list);
		if (ptr->accel_id == id) {
			mutex_unlock(&table_lock);
			return ptr;
		}
	}
unlock:
	mutex_unlock(&table_lock);
	return NULL;
}

int adf_devmgr_verify_id(u32 id)
{
	if (id == ADF_CFG_ALL_DEVICES)
		return 0;

	if (adf_devmgr_get_dev_by_id(id))
		return 0;

	return -ENODEV;
}

static int adf_get_num_dettached_vfs(void)
{
	struct list_head *itr;
	int vfs = 0;

	mutex_lock(&table_lock);
	list_for_each(itr, &vfs_table) {
		struct vf_id_map *ptr =
			list_entry(itr, struct vf_id_map, list);
		if (ptr->bdf != ~0 && !ptr->attached)
			vfs++;
	}
	mutex_unlock(&table_lock);
	return vfs;
}

void adf_devmgr_get_num_dev(u32 *num)
{
	*num = num_devices - adf_get_num_dettached_vfs();
}

/**
 * adf_dev_in_use() - Check whether accel_dev is currently in use
 * @accel_dev: Pointer to acceleration device.
 *
 * To be used by QAT device specific drivers.
 *
 * Return: 1 when device is in use, 0 otherwise.
 */
int adf_dev_in_use(struct adf_accel_dev *accel_dev)
{
	return atomic_read(&accel_dev->ref_count) != 0;
}
EXPORT_SYMBOL_GPL(adf_dev_in_use);

/**
 * adf_dev_get() - Increment accel_dev reference count
 * @accel_dev: Pointer to acceleration device.
 *
 * Increment the accel_dev refcount and if this is the first time
 * incrementing it during this period the accel_dev is in use,
 * increment the module refcount too.
 * To be used by QAT device specific drivers.
 *
 * Return: 0 when successful, EFAULT when fail to bump module refcount
 */
int adf_dev_get(struct adf_accel_dev *accel_dev)
{
	if (atomic_add_return(1, &accel_dev->ref_count) == 1)
		if (!try_module_get(accel_dev->owner))
			return -EFAULT;
	return 0;
}
EXPORT_SYMBOL_GPL(adf_dev_get);

/**
 * adf_dev_put() - Decrement accel_dev reference count
 * @accel_dev: Pointer to acceleration device.
 *
 * Decrement the accel_dev refcount and if this is the last time
 * decrementing it during this period the accel_dev is in use,
 * decrement the module refcount too.
 * To be used by QAT device specific drivers.
 *
 * Return: void
 */
void adf_dev_put(struct adf_accel_dev *accel_dev)
{
	if (atomic_sub_return(1, &accel_dev->ref_count) == 0)
		module_put(accel_dev->owner);
}
EXPORT_SYMBOL_GPL(adf_dev_put);

/**
 * adf_devmgr_in_reset() - Check whether device is in reset
 * @accel_dev: Pointer to acceleration device.
 *
 * To be used by QAT device specific drivers.
 *
 * Return: 1 when the device is being reset, 0 otherwise.
 */
int adf_devmgr_in_reset(struct adf_accel_dev *accel_dev)
{
	return test_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
}
EXPORT_SYMBOL_GPL(adf_devmgr_in_reset);

/**
 * adf_dev_started() - Check whether device has started
 * @accel_dev: Pointer to acceleration device.
 *
 * To be used by QAT device specific drivers.
 *
 * Return: 1 when the device has started, 0 otherwise
 */
int adf_dev_started(struct adf_accel_dev *accel_dev)
{
	return test_bit(ADF_STATUS_STARTED, &accel_dev->status);
}
EXPORT_SYMBOL_GPL(adf_dev_started);