blob: 90ba1eb1df06e5283a2dad9132b53346f5106812 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Stefani Seibold2e956fb2010-08-10 18:03:38 -07002 * A generic kernel FIFO implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
Stefani Seibold2e956fb2010-08-10 18:03:38 -07004 * Copyright (C) 2009/2010 Stefani Seibold <stefani@seibold.net>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
Stefani Seiboldd78a3ed2010-08-11 14:17:27 -070013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 *
20 */
21
22#include <linux/kernel.h>
Paul Gortmaker9984de12011-05-23 14:51:41 -040023#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/slab.h>
25#include <linux/err.h>
vignesh babuf84d5a72007-07-15 23:41:34 -070026#include <linux/log2.h>
Stefani Seibolda121f242009-12-21 14:37:31 -080027#include <linux/uaccess.h>
Stefani Seibold2e956fb2010-08-10 18:03:38 -070028#include <linux/kfifo.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Stefani Seibold2e956fb2010-08-10 18:03:38 -070030/*
31 * internal helper to calculate the unused elements in a fifo
32 */
33static inline unsigned int kfifo_unused(struct __kfifo *fifo)
Stefani Seibold45465482009-12-21 14:37:26 -080034{
Stefani Seibold2e956fb2010-08-10 18:03:38 -070035 return (fifo->mask + 1) - (fifo->in - fifo->out);
Stefani Seibold45465482009-12-21 14:37:26 -080036}
37
Stefani Seibold2e956fb2010-08-10 18:03:38 -070038int __kfifo_alloc(struct __kfifo *fifo, unsigned int size,
39 size_t esize, gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 /*
Stefani Seibold2e956fb2010-08-10 18:03:38 -070042 * round down to the next power of 2, since our 'let the indices
Robert P. J. Dayb33112d2009-06-16 15:33:34 -070043 * wrap' technique works only in this case.
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 */
Stefani Seibolddfe2a772013-02-27 17:05:51 -080045 size = roundup_pow_of_two(size);
Stefani Seibold2e956fb2010-08-10 18:03:38 -070046
47 fifo->in = 0;
48 fifo->out = 0;
49 fifo->esize = esize;
50
51 if (size < 2) {
52 fifo->data = NULL;
53 fifo->mask = 0;
54 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 }
56
Stefani Seibold2e956fb2010-08-10 18:03:38 -070057 fifo->data = kmalloc(size * esize, gfp_mask);
58
59 if (!fifo->data) {
60 fifo->mask = 0;
Stefani Seibold45465482009-12-21 14:37:26 -080061 return -ENOMEM;
62 }
Stefani Seibold2e956fb2010-08-10 18:03:38 -070063 fifo->mask = size - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Stefani Seibold45465482009-12-21 14:37:26 -080065 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066}
Stefani Seibold2e956fb2010-08-10 18:03:38 -070067EXPORT_SYMBOL(__kfifo_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Stefani Seibold2e956fb2010-08-10 18:03:38 -070069void __kfifo_free(struct __kfifo *fifo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Stefani Seibold2e956fb2010-08-10 18:03:38 -070071 kfree(fifo->data);
72 fifo->in = 0;
73 fifo->out = 0;
74 fifo->esize = 0;
75 fifo->data = NULL;
76 fifo->mask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
Stefani Seibold2e956fb2010-08-10 18:03:38 -070078EXPORT_SYMBOL(__kfifo_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Stefani Seibold2e956fb2010-08-10 18:03:38 -070080int __kfifo_init(struct __kfifo *fifo, void *buffer,
81 unsigned int size, size_t esize)
Stefani Seibolda121f242009-12-21 14:37:31 -080082{
Stefani Seibold2e956fb2010-08-10 18:03:38 -070083 size /= esize;
84
Stefani Seibolddfe2a772013-02-27 17:05:51 -080085 size = roundup_pow_of_two(size);
Stefani Seibold2e956fb2010-08-10 18:03:38 -070086
87 fifo->in = 0;
88 fifo->out = 0;
89 fifo->esize = esize;
90 fifo->data = buffer;
91
92 if (size < 2) {
93 fifo->mask = 0;
94 return -EINVAL;
Stefani Seibolda121f242009-12-21 14:37:31 -080095 }
Stefani Seibold2e956fb2010-08-10 18:03:38 -070096 fifo->mask = size - 1;
Stefani Seibolda121f242009-12-21 14:37:31 -080097
Andi Kleen64ce1032010-01-15 17:01:15 -080098 return 0;
Stefani Seibold86d48802009-12-21 14:37:32 -080099}
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700100EXPORT_SYMBOL(__kfifo_init);
Stefani Seibold86d48802009-12-21 14:37:32 -0800101
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700102static void kfifo_copy_in(struct __kfifo *fifo, const void *src,
103 unsigned int len, unsigned int off)
Stefani Seibold86d48802009-12-21 14:37:32 -0800104{
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700105 unsigned int size = fifo->mask + 1;
106 unsigned int esize = fifo->esize;
107 unsigned int l;
Stefani Seibold86d48802009-12-21 14:37:32 -0800108
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700109 off &= fifo->mask;
110 if (esize != 1) {
111 off *= esize;
112 size *= esize;
113 len *= esize;
114 }
115 l = min(len, size - off);
116
117 memcpy(fifo->data + off, src, l);
118 memcpy(fifo->data, src + l, len - l);
119 /*
120 * make sure that the data in the fifo is up to date before
121 * incrementing the fifo->in index counter
122 */
123 smp_wmb();
Stefani Seibold86d48802009-12-21 14:37:32 -0800124}
Stefani Seibold86d48802009-12-21 14:37:32 -0800125
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700126unsigned int __kfifo_in(struct __kfifo *fifo,
127 const void *buf, unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128{
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700129 unsigned int l;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700131 l = kfifo_unused(fifo);
132 if (len > l)
133 len = l;
134
135 kfifo_copy_in(fifo, buf, len, fifo->in);
136 fifo->in += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 return len;
138}
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700139EXPORT_SYMBOL(__kfifo_in);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700141static void kfifo_copy_out(struct __kfifo *fifo, void *dst,
142 unsigned int len, unsigned int off)
Stefani Seibold86d48802009-12-21 14:37:32 -0800143{
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700144 unsigned int size = fifo->mask + 1;
145 unsigned int esize = fifo->esize;
146 unsigned int l;
147
148 off &= fifo->mask;
149 if (esize != 1) {
150 off *= esize;
151 size *= esize;
152 len *= esize;
153 }
154 l = min(len, size - off);
155
156 memcpy(dst, fifo->data + off, l);
157 memcpy(dst + l, fifo->data, len - l);
158 /*
159 * make sure that the data is copied before
160 * incrementing the fifo->out index counter
161 */
162 smp_wmb();
Stefani Seibold86d48802009-12-21 14:37:32 -0800163}
Stefani Seibold86d48802009-12-21 14:37:32 -0800164
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700165unsigned int __kfifo_out_peek(struct __kfifo *fifo,
166 void *buf, unsigned int len)
Stefani Seibold86d48802009-12-21 14:37:32 -0800167{
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700168 unsigned int l;
Stefani Seibold86d48802009-12-21 14:37:32 -0800169
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700170 l = fifo->in - fifo->out;
171 if (len > l)
172 len = l;
Stefani Seibold86d48802009-12-21 14:37:32 -0800173
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700174 kfifo_copy_out(fifo, buf, len, fifo->out);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 return len;
176}
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700177EXPORT_SYMBOL(__kfifo_out_peek);
Stefani Seibolda121f242009-12-21 14:37:31 -0800178
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700179unsigned int __kfifo_out(struct __kfifo *fifo,
180 void *buf, unsigned int len)
Andi Kleena5b9e2c2010-01-15 17:01:16 -0800181{
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700182 len = __kfifo_out_peek(fifo, buf, len);
183 fifo->out += len;
Andi Kleena5b9e2c2010-01-15 17:01:16 -0800184 return len;
185}
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700186EXPORT_SYMBOL(__kfifo_out);
Andi Kleena5b9e2c2010-01-15 17:01:16 -0800187
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700188static unsigned long kfifo_copy_from_user(struct __kfifo *fifo,
189 const void __user *from, unsigned int len, unsigned int off,
190 unsigned int *copied)
Stefani Seibold86d48802009-12-21 14:37:32 -0800191{
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700192 unsigned int size = fifo->mask + 1;
193 unsigned int esize = fifo->esize;
194 unsigned int l;
195 unsigned long ret;
Stefani Seibold86d48802009-12-21 14:37:32 -0800196
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700197 off &= fifo->mask;
198 if (esize != 1) {
199 off *= esize;
200 size *= esize;
201 len *= esize;
202 }
203 l = min(len, size - off);
Andi Kleen64ce1032010-01-15 17:01:15 -0800204
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700205 ret = copy_from_user(fifo->data + off, from, l);
206 if (unlikely(ret))
207 ret = DIV_ROUND_UP(ret + len - l, esize);
208 else {
209 ret = copy_from_user(fifo->data, from + l, len - l);
210 if (unlikely(ret))
211 ret = DIV_ROUND_UP(ret, esize);
212 }
213 /*
214 * make sure that the data in the fifo is up to date before
215 * incrementing the fifo->in index counter
216 */
217 smp_wmb();
Lars-Peter Clausena019e482013-11-14 14:32:16 -0800218 *copied = len - ret * esize;
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700219 /* return the number of elements which are not copied */
Andi Kleen64ce1032010-01-15 17:01:15 -0800220 return ret;
Stefani Seibolda121f242009-12-21 14:37:31 -0800221}
Stefani Seibolda121f242009-12-21 14:37:31 -0800222
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700223int __kfifo_from_user(struct __kfifo *fifo, const void __user *from,
224 unsigned long len, unsigned int *copied)
Stefani Seibold86d48802009-12-21 14:37:32 -0800225{
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700226 unsigned int l;
227 unsigned long ret;
228 unsigned int esize = fifo->esize;
229 int err;
230
231 if (esize != 1)
232 len /= esize;
233
234 l = kfifo_unused(fifo);
235 if (len > l)
236 len = l;
237
238 ret = kfifo_copy_from_user(fifo, from, len, fifo->in, copied);
239 if (unlikely(ret)) {
240 len -= ret;
241 err = -EFAULT;
242 } else
243 err = 0;
244 fifo->in += len;
245 return err;
Stefani Seibold86d48802009-12-21 14:37:32 -0800246}
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700247EXPORT_SYMBOL(__kfifo_from_user);
Stefani Seibold86d48802009-12-21 14:37:32 -0800248
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700249static unsigned long kfifo_copy_to_user(struct __kfifo *fifo, void __user *to,
250 unsigned int len, unsigned int off, unsigned int *copied)
Stefani Seibold86d48802009-12-21 14:37:32 -0800251{
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700252 unsigned int l;
253 unsigned long ret;
254 unsigned int size = fifo->mask + 1;
255 unsigned int esize = fifo->esize;
Stefani Seibold86d48802009-12-21 14:37:32 -0800256
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700257 off &= fifo->mask;
258 if (esize != 1) {
259 off *= esize;
260 size *= esize;
261 len *= esize;
262 }
263 l = min(len, size - off);
264
265 ret = copy_to_user(to, fifo->data + off, l);
266 if (unlikely(ret))
267 ret = DIV_ROUND_UP(ret + len - l, esize);
268 else {
269 ret = copy_to_user(to + l, fifo->data, len - l);
270 if (unlikely(ret))
271 ret = DIV_ROUND_UP(ret, esize);
272 }
273 /*
274 * make sure that the data is copied before
275 * incrementing the fifo->out index counter
276 */
277 smp_wmb();
Lars-Peter Clausena019e482013-11-14 14:32:16 -0800278 *copied = len - ret * esize;
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700279 /* return the number of elements which are not copied */
280 return ret;
281}
282
283int __kfifo_to_user(struct __kfifo *fifo, void __user *to,
284 unsigned long len, unsigned int *copied)
285{
286 unsigned int l;
287 unsigned long ret;
288 unsigned int esize = fifo->esize;
289 int err;
290
291 if (esize != 1)
292 len /= esize;
293
294 l = fifo->in - fifo->out;
295 if (len > l)
296 len = l;
297 ret = kfifo_copy_to_user(fifo, to, len, fifo->out, copied);
298 if (unlikely(ret)) {
299 len -= ret;
300 err = -EFAULT;
301 } else
302 err = 0;
303 fifo->out += len;
304 return err;
305}
306EXPORT_SYMBOL(__kfifo_to_user);
307
308static int setup_sgl_buf(struct scatterlist *sgl, void *buf,
309 int nents, unsigned int len)
310{
311 int n;
312 unsigned int l;
313 unsigned int off;
314 struct page *page;
315
316 if (!nents)
317 return 0;
318
319 if (!len)
320 return 0;
321
322 n = 0;
323 page = virt_to_page(buf);
324 off = offset_in_page(buf);
325 l = 0;
326
327 while (len >= l + PAGE_SIZE - off) {
328 struct page *npage;
329
330 l += PAGE_SIZE;
331 buf += PAGE_SIZE;
332 npage = virt_to_page(buf);
333 if (page_to_phys(page) != page_to_phys(npage) - l) {
Stefani Seiboldd78a3ed2010-08-11 14:17:27 -0700334 sg_set_page(sgl, page, l - off, off);
335 sgl = sg_next(sgl);
336 if (++n == nents || sgl == NULL)
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700337 return n;
338 page = npage;
339 len -= l - off;
340 l = off = 0;
341 }
342 }
Stefani Seiboldd78a3ed2010-08-11 14:17:27 -0700343 sg_set_page(sgl, page, len, off);
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700344 return n + 1;
345}
346
347static unsigned int setup_sgl(struct __kfifo *fifo, struct scatterlist *sgl,
348 int nents, unsigned int len, unsigned int off)
349{
350 unsigned int size = fifo->mask + 1;
351 unsigned int esize = fifo->esize;
352 unsigned int l;
353 unsigned int n;
354
355 off &= fifo->mask;
356 if (esize != 1) {
357 off *= esize;
358 size *= esize;
359 len *= esize;
360 }
361 l = min(len, size - off);
362
Stefani Seiboldd78a3ed2010-08-11 14:17:27 -0700363 n = setup_sgl_buf(sgl, fifo->data + off, nents, l);
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700364 n += setup_sgl_buf(sgl + n, fifo->data, nents - n, len - l);
365
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700366 return n;
367}
368
369unsigned int __kfifo_dma_in_prepare(struct __kfifo *fifo,
370 struct scatterlist *sgl, int nents, unsigned int len)
371{
372 unsigned int l;
373
374 l = kfifo_unused(fifo);
375 if (len > l)
376 len = l;
377
378 return setup_sgl(fifo, sgl, nents, len, fifo->in);
379}
380EXPORT_SYMBOL(__kfifo_dma_in_prepare);
381
382unsigned int __kfifo_dma_out_prepare(struct __kfifo *fifo,
383 struct scatterlist *sgl, int nents, unsigned int len)
384{
385 unsigned int l;
386
387 l = fifo->in - fifo->out;
388 if (len > l)
389 len = l;
390
391 return setup_sgl(fifo, sgl, nents, len, fifo->out);
392}
393EXPORT_SYMBOL(__kfifo_dma_out_prepare);
394
395unsigned int __kfifo_max_r(unsigned int len, size_t recsize)
396{
397 unsigned int max = (1 << (recsize << 3)) - 1;
398
399 if (len > max)
400 return max;
401 return len;
402}
Srinivas Kandagatla30059d92012-04-11 05:01:56 -0300403EXPORT_SYMBOL(__kfifo_max_r);
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700404
405#define __KFIFO_PEEK(data, out, mask) \
406 ((data)[(out) & (mask)])
407/*
408 * __kfifo_peek_n internal helper function for determinate the length of
409 * the next record in the fifo
410 */
411static unsigned int __kfifo_peek_n(struct __kfifo *fifo, size_t recsize)
412{
413 unsigned int l;
414 unsigned int mask = fifo->mask;
415 unsigned char *data = fifo->data;
416
417 l = __KFIFO_PEEK(data, fifo->out, mask);
418
419 if (--recsize)
420 l |= __KFIFO_PEEK(data, fifo->out + 1, mask) << 8;
421
422 return l;
423}
424
425#define __KFIFO_POKE(data, in, mask, val) \
426 ( \
427 (data)[(in) & (mask)] = (unsigned char)(val) \
428 )
429
430/*
431 * __kfifo_poke_n internal helper function for storeing the length of
432 * the record into the fifo
433 */
434static void __kfifo_poke_n(struct __kfifo *fifo, unsigned int n, size_t recsize)
435{
436 unsigned int mask = fifo->mask;
437 unsigned char *data = fifo->data;
438
439 __KFIFO_POKE(data, fifo->in, mask, n);
440
441 if (recsize > 1)
442 __KFIFO_POKE(data, fifo->in + 1, mask, n >> 8);
443}
444
445unsigned int __kfifo_len_r(struct __kfifo *fifo, size_t recsize)
446{
Stefani Seibold86d48802009-12-21 14:37:32 -0800447 return __kfifo_peek_n(fifo, recsize);
448}
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700449EXPORT_SYMBOL(__kfifo_len_r);
Stefani Seibold86d48802009-12-21 14:37:32 -0800450
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700451unsigned int __kfifo_in_r(struct __kfifo *fifo, const void *buf,
452 unsigned int len, size_t recsize)
Stefani Seibold86d48802009-12-21 14:37:32 -0800453{
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700454 if (len + recsize > kfifo_unused(fifo))
455 return 0;
Stefani Seibold86d48802009-12-21 14:37:32 -0800456
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700457 __kfifo_poke_n(fifo, len, recsize);
458
459 kfifo_copy_in(fifo, buf, len, fifo->in + recsize);
460 fifo->in += len + recsize;
461 return len;
462}
463EXPORT_SYMBOL(__kfifo_in_r);
464
465static unsigned int kfifo_out_copy_r(struct __kfifo *fifo,
466 void *buf, unsigned int len, size_t recsize, unsigned int *n)
467{
468 *n = __kfifo_peek_n(fifo, recsize);
469
470 if (len > *n)
471 len = *n;
472
473 kfifo_copy_out(fifo, buf, len, fifo->out + recsize);
474 return len;
475}
476
477unsigned int __kfifo_out_peek_r(struct __kfifo *fifo, void *buf,
478 unsigned int len, size_t recsize)
479{
480 unsigned int n;
481
482 if (fifo->in == fifo->out)
483 return 0;
484
485 return kfifo_out_copy_r(fifo, buf, len, recsize, &n);
486}
487EXPORT_SYMBOL(__kfifo_out_peek_r);
488
489unsigned int __kfifo_out_r(struct __kfifo *fifo, void *buf,
490 unsigned int len, size_t recsize)
491{
492 unsigned int n;
493
494 if (fifo->in == fifo->out)
495 return 0;
496
497 len = kfifo_out_copy_r(fifo, buf, len, recsize, &n);
498 fifo->out += n + recsize;
499 return len;
500}
501EXPORT_SYMBOL(__kfifo_out_r);
502
Andrea Righib35de432010-08-19 14:13:27 -0700503void __kfifo_skip_r(struct __kfifo *fifo, size_t recsize)
504{
505 unsigned int n;
506
507 n = __kfifo_peek_n(fifo, recsize);
508 fifo->out += n + recsize;
509}
510EXPORT_SYMBOL(__kfifo_skip_r);
511
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700512int __kfifo_from_user_r(struct __kfifo *fifo, const void __user *from,
513 unsigned long len, unsigned int *copied, size_t recsize)
514{
515 unsigned long ret;
516
517 len = __kfifo_max_r(len, recsize);
518
519 if (len + recsize > kfifo_unused(fifo)) {
520 *copied = 0;
521 return 0;
522 }
523
524 __kfifo_poke_n(fifo, len, recsize);
525
526 ret = kfifo_copy_from_user(fifo, from, len, fifo->in + recsize, copied);
527 if (unlikely(ret)) {
528 *copied = 0;
529 return -EFAULT;
530 }
531 fifo->in += len + recsize;
532 return 0;
533}
534EXPORT_SYMBOL(__kfifo_from_user_r);
535
536int __kfifo_to_user_r(struct __kfifo *fifo, void __user *to,
537 unsigned long len, unsigned int *copied, size_t recsize)
538{
539 unsigned long ret;
540 unsigned int n;
541
542 if (fifo->in == fifo->out) {
543 *copied = 0;
544 return 0;
545 }
546
547 n = __kfifo_peek_n(fifo, recsize);
548 if (len > n)
549 len = n;
550
551 ret = kfifo_copy_to_user(fifo, to, len, fifo->out + recsize, copied);
552 if (unlikely(ret)) {
553 *copied = 0;
554 return -EFAULT;
555 }
556 fifo->out += n + recsize;
557 return 0;
558}
559EXPORT_SYMBOL(__kfifo_to_user_r);
560
561unsigned int __kfifo_dma_in_prepare_r(struct __kfifo *fifo,
562 struct scatterlist *sgl, int nents, unsigned int len, size_t recsize)
563{
Himangi Saraogi89b3ac62014-08-08 14:22:44 -0700564 BUG_ON(!nents);
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700565
566 len = __kfifo_max_r(len, recsize);
567
568 if (len + recsize > kfifo_unused(fifo))
569 return 0;
570
571 return setup_sgl(fifo, sgl, nents, len, fifo->in + recsize);
572}
573EXPORT_SYMBOL(__kfifo_dma_in_prepare_r);
574
575void __kfifo_dma_in_finish_r(struct __kfifo *fifo,
576 unsigned int len, size_t recsize)
577{
578 len = __kfifo_max_r(len, recsize);
579 __kfifo_poke_n(fifo, len, recsize);
580 fifo->in += len + recsize;
581}
582EXPORT_SYMBOL(__kfifo_dma_in_finish_r);
583
584unsigned int __kfifo_dma_out_prepare_r(struct __kfifo *fifo,
585 struct scatterlist *sgl, int nents, unsigned int len, size_t recsize)
586{
Himangi Saraogi89b3ac62014-08-08 14:22:44 -0700587 BUG_ON(!nents);
Stefani Seibold2e956fb2010-08-10 18:03:38 -0700588
589 len = __kfifo_max_r(len, recsize);
590
591 if (len + recsize > fifo->in - fifo->out)
592 return 0;
593
594 return setup_sgl(fifo, sgl, nents, len, fifo->out + recsize);
595}
596EXPORT_SYMBOL(__kfifo_dma_out_prepare_r);
597
598void __kfifo_dma_out_finish_r(struct __kfifo *fifo, size_t recsize)
599{
600 unsigned int len;
601
602 len = __kfifo_peek_n(fifo, recsize);
603 fifo->out += len + recsize;
604}
605EXPORT_SYMBOL(__kfifo_dma_out_finish_r);