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
|
/* Copyright (c) 2012,2014-2017,2019 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/err.h>
#include <linux/stacktrace.h>
#include <linux/spinlock.h>
#include <linux/debugfs.h>
#ifdef CONFIG_WCNSS_SKB_PRE_ALLOC
#include <linux/skbuff.h>
#endif
#include <net/cnss_prealloc.h>
static DEFINE_SPINLOCK(alloc_lock);
#ifdef CONFIG_SLUB_DEBUG
#define WCNSS_MAX_STACK_TRACE 64
#endif
#define PRE_ALLOC_DEBUGFS_DIR "cnss-prealloc"
#define PRE_ALLOC_DEBUGFS_FILE_OBJ "status"
static struct dentry *debug_base;
struct wcnss_prealloc {
int occupied;
size_t size;
void *ptr;
#ifdef CONFIG_SLUB_DEBUG
unsigned long stack_trace[WCNSS_MAX_STACK_TRACE];
struct stack_trace trace;
#endif
};
/* pre-alloced mem for WLAN driver */
#ifdef CONFIG_CNSS_QCA6390
/* This table should be paired with WLAN chip attached ideally.
* For QCA6390, roughly 800KB pre-allocation required.
*
* Be noted, currently not all QCA6390 attachment defined CNSS_QCA6390,
* like on which single-DT feature enabled.
*/
static struct wcnss_prealloc wcnss_allocs[] = {
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 64 * 1024, NULL},
{0, 64 * 1024, NULL},
{0, 64 * 1024, NULL},
{0, 64 * 1024, NULL},
};
#else
static struct wcnss_prealloc wcnss_allocs[] = {
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 8 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 16 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 32 * 1024, NULL},
{0, 64 * 1024, NULL},
{0, 64 * 1024, NULL},
{0, 64 * 1024, NULL},
{0, 64 * 1024, NULL},
{0, 128 * 1024, NULL},
{0, 128 * 1024, NULL},
};
#endif
int wcnss_prealloc_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
wcnss_allocs[i].occupied = 0;
wcnss_allocs[i].ptr = kmalloc(wcnss_allocs[i].size, GFP_KERNEL);
if (!wcnss_allocs[i].ptr)
return -ENOMEM;
}
return 0;
}
void wcnss_prealloc_deinit(void)
{
int i = 0;
for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
kfree(wcnss_allocs[i].ptr);
wcnss_allocs[i].ptr = NULL;
}
}
#ifdef CONFIG_SLUB_DEBUG
static void wcnss_prealloc_save_stack_trace(struct wcnss_prealloc *entry)
{
struct stack_trace *trace = &entry->trace;
memset(&entry->stack_trace, 0, sizeof(entry->stack_trace));
trace->nr_entries = 0;
trace->max_entries = WCNSS_MAX_STACK_TRACE;
trace->entries = entry->stack_trace;
trace->skip = 2;
save_stack_trace(trace);
}
#else
static inline
void wcnss_prealloc_save_stack_trace(struct wcnss_prealloc *entry) {}
#endif
void *wcnss_prealloc_get(size_t size)
{
int i = 0;
unsigned long flags;
spin_lock_irqsave(&alloc_lock, flags);
for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
if (wcnss_allocs[i].occupied)
continue;
if (wcnss_allocs[i].size >= size) {
/* we found the slot */
wcnss_allocs[i].occupied = 1;
spin_unlock_irqrestore(&alloc_lock, flags);
wcnss_prealloc_save_stack_trace(&wcnss_allocs[i]);
return wcnss_allocs[i].ptr;
}
}
spin_unlock_irqrestore(&alloc_lock, flags);
return NULL;
}
EXPORT_SYMBOL(wcnss_prealloc_get);
int wcnss_prealloc_put(void *ptr)
{
int i = 0;
unsigned long flags;
spin_lock_irqsave(&alloc_lock, flags);
for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
if (wcnss_allocs[i].ptr == ptr) {
wcnss_allocs[i].occupied = 0;
spin_unlock_irqrestore(&alloc_lock, flags);
return 1;
}
}
spin_unlock_irqrestore(&alloc_lock, flags);
return 0;
}
EXPORT_SYMBOL(wcnss_prealloc_put);
#ifdef CONFIG_SLUB_DEBUG
void wcnss_prealloc_check_memory_leak(void)
{
int i, j = 0;
for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
if (!wcnss_allocs[i].occupied)
continue;
if (j == 0) {
pr_err("wcnss_prealloc: Memory leak detected\n");
j++;
}
pr_err("Size: %zu, addr: %pK, backtrace:\n",
wcnss_allocs[i].size, wcnss_allocs[i].ptr);
print_stack_trace(&wcnss_allocs[i].trace, 1);
}
}
#else
void wcnss_prealloc_check_memory_leak(void) {}
#endif
EXPORT_SYMBOL(wcnss_prealloc_check_memory_leak);
int wcnss_pre_alloc_reset(void)
{
int i, n = 0;
for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
if (!wcnss_allocs[i].occupied)
continue;
wcnss_allocs[i].occupied = 0;
n++;
}
return n;
}
EXPORT_SYMBOL(wcnss_pre_alloc_reset);
static int prealloc_memory_stats_show(struct seq_file *fp, void *data)
{
int i = 0;
int used_slots = 0, free_slots = 0;
unsigned int tsize = 0, tused = 0, size = 0;
seq_puts(fp, "\nSlot_Size(Kb)\t\t[Used : Free]\n");
for (i = 0; i < ARRAY_SIZE(wcnss_allocs); i++) {
tsize += wcnss_allocs[i].size;
if (size != wcnss_allocs[i].size) {
if (size) {
seq_printf(
fp, "[%d : %d]\n",
used_slots, free_slots);
}
size = wcnss_allocs[i].size;
used_slots = 0;
free_slots = 0;
seq_printf(fp, "%d Kb\t\t\t", size / 1024);
}
if (wcnss_allocs[i].occupied) {
tused += wcnss_allocs[i].size;
++used_slots;
} else {
++free_slots;
}
}
seq_printf(fp, "[%d : %d]\n", used_slots, free_slots);
/* Convert byte to Kb */
if (tsize)
tsize = tsize / 1024;
if (tused)
tused = tused / 1024;
seq_printf(fp, "\nMemory Status:\nTotal Memory: %dKb\n", tsize);
seq_printf(fp, "Used: %dKb\nFree: %dKb\n", tused, tsize - tused);
return 0;
}
static int prealloc_memory_stats_open(struct inode *inode, struct file *file)
{
return single_open(file, prealloc_memory_stats_show, NULL);
}
static const struct file_operations prealloc_memory_stats_fops = {
.owner = THIS_MODULE,
.open = prealloc_memory_stats_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int __init wcnss_pre_alloc_init(void)
{
int ret;
ret = wcnss_prealloc_init();
if (ret) {
pr_err("%s: Failed to init the prealloc pool\n", __func__);
return ret;
}
debug_base = debugfs_create_dir(PRE_ALLOC_DEBUGFS_DIR, NULL);
if (IS_ERR_OR_NULL(debug_base)) {
pr_err("%s: Failed to create debugfs dir\n", __func__);
} else if (IS_ERR_OR_NULL(debugfs_create_file(
PRE_ALLOC_DEBUGFS_FILE_OBJ,
0644, debug_base, NULL,
&prealloc_memory_stats_fops))) {
pr_err("%s: Failed to create debugfs file\n", __func__);
debugfs_remove_recursive(debug_base);
}
return ret;
}
static void __exit wcnss_pre_alloc_exit(void)
{
wcnss_prealloc_deinit();
debugfs_remove_recursive(debug_base);
}
module_init(wcnss_pre_alloc_init);
module_exit(wcnss_pre_alloc_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION(DEVICE "WCNSS Prealloc Driver");
|
