Lines Matching refs:fifo
17 * internal helper to calculate the unused elements in a fifo
19 static inline unsigned int kfifo_unused(struct __kfifo *fifo)
21 return (fifo->mask + 1) - (fifo->in - fifo->out);
24 int __kfifo_alloc(struct __kfifo *fifo, unsigned int size,
33 fifo->in = 0;
34 fifo->out = 0;
35 fifo->esize = esize;
38 fifo->data = NULL;
39 fifo->mask = 0;
43 fifo->data = kmalloc_array(esize, size, gfp_mask);
45 if (!fifo->data) {
46 fifo->mask = 0;
49 fifo->mask = size - 1;
55 void __kfifo_free(struct __kfifo *fifo)
57 kfree(fifo->data);
58 fifo->in = 0;
59 fifo->out = 0;
60 fifo->esize = 0;
61 fifo->data = NULL;
62 fifo->mask = 0;
66 int __kfifo_init(struct __kfifo *fifo, void *buffer,
74 fifo->in = 0;
75 fifo->out = 0;
76 fifo->esize = esize;
77 fifo->data = buffer;
80 fifo->mask = 0;
83 fifo->mask = size - 1;
89 static void kfifo_copy_in(struct __kfifo *fifo, const void *src,
92 unsigned int size = fifo->mask + 1;
93 unsigned int esize = fifo->esize;
96 off &= fifo->mask;
104 memcpy(fifo->data + off, src, l);
105 memcpy(fifo->data, src + l, len - l);
107 * make sure that the data in the fifo is up to date before
108 * incrementing the fifo->in index counter
113 unsigned int __kfifo_in(struct __kfifo *fifo,
118 l = kfifo_unused(fifo);
122 kfifo_copy_in(fifo, buf, len, fifo->in);
123 fifo->in += len;
128 static void kfifo_copy_out(struct __kfifo *fifo, void *dst,
131 unsigned int size = fifo->mask + 1;
132 unsigned int esize = fifo->esize;
135 off &= fifo->mask;
143 memcpy(dst, fifo->data + off, l);
144 memcpy(dst + l, fifo->data, len - l);
147 * incrementing the fifo->out index counter
152 unsigned int __kfifo_out_peek(struct __kfifo *fifo,
157 l = fifo->in - fifo->out;
161 kfifo_copy_out(fifo, buf, len, fifo->out);
166 unsigned int __kfifo_out(struct __kfifo *fifo,
169 len = __kfifo_out_peek(fifo, buf, len);
170 fifo->out += len;
175 static unsigned long kfifo_copy_from_user(struct __kfifo *fifo,
179 unsigned int size = fifo->mask + 1;
180 unsigned int esize = fifo->esize;
184 off &= fifo->mask;
192 ret = copy_from_user(fifo->data + off, from, l);
196 ret = copy_from_user(fifo->data, from + l, len - l);
201 * make sure that the data in the fifo is up to date before
202 * incrementing the fifo->in index counter
210 int __kfifo_from_user(struct __kfifo *fifo, const void __user *from,
215 unsigned int esize = fifo->esize;
221 l = kfifo_unused(fifo);
225 ret = kfifo_copy_from_user(fifo, from, len, fifo->in, copied);
231 fifo->in += len;
236 static unsigned long kfifo_copy_to_user(struct __kfifo *fifo, void __user *to,
241 unsigned int size = fifo->mask + 1;
242 unsigned int esize = fifo->esize;
244 off &= fifo->mask;
252 ret = copy_to_user(to, fifo->data + off, l);
256 ret = copy_to_user(to + l, fifo->data, len - l);
262 * incrementing the fifo->out index counter
270 int __kfifo_to_user(struct __kfifo *fifo, void __user *to,
275 unsigned int esize = fifo->esize;
281 l = fifo->in - fifo->out;
284 ret = kfifo_copy_to_user(fifo, to, len, fifo->out, copied);
290 fifo->out += len;
334 static unsigned int setup_sgl(struct __kfifo *fifo, struct scatterlist *sgl,
337 unsigned int size = fifo->mask + 1;
338 unsigned int esize = fifo->esize;
342 off &= fifo->mask;
350 n = setup_sgl_buf(sgl, fifo->data + off, nents, l);
351 n += setup_sgl_buf(sgl + n, fifo->data, nents - n, len - l);
356 unsigned int __kfifo_dma_in_prepare(struct __kfifo *fifo,
361 l = kfifo_unused(fifo);
365 return setup_sgl(fifo, sgl, nents, len, fifo->in);
369 unsigned int __kfifo_dma_out_prepare(struct __kfifo *fifo,
374 l = fifo->in - fifo->out;
378 return setup_sgl(fifo, sgl, nents, len, fifo->out);
396 * the next record in the fifo
398 static unsigned int __kfifo_peek_n(struct __kfifo *fifo, size_t recsize)
401 unsigned int mask = fifo->mask;
402 unsigned char *data = fifo->data;
404 l = __KFIFO_PEEK(data, fifo->out, mask);
407 l |= __KFIFO_PEEK(data, fifo->out + 1, mask) << 8;
419 * the record into the fifo
421 static void __kfifo_poke_n(struct __kfifo *fifo, unsigned int n, size_t recsize)
423 unsigned int mask = fifo->mask;
424 unsigned char *data = fifo->data;
426 __KFIFO_POKE(data, fifo->in, mask, n);
429 __KFIFO_POKE(data, fifo->in + 1, mask, n >> 8);
432 unsigned int __kfifo_len_r(struct __kfifo *fifo, size_t recsize)
434 return __kfifo_peek_n(fifo, recsize);
438 unsigned int __kfifo_in_r(struct __kfifo *fifo, const void *buf,
441 if (len + recsize > kfifo_unused(fifo))
444 __kfifo_poke_n(fifo, len, recsize);
446 kfifo_copy_in(fifo, buf, len, fifo->in + recsize);
447 fifo->in += len + recsize;
452 static unsigned int kfifo_out_copy_r(struct __kfifo *fifo,
455 *n = __kfifo_peek_n(fifo, recsize);
460 kfifo_copy_out(fifo, buf, len, fifo->out + recsize);
464 unsigned int __kfifo_out_peek_r(struct __kfifo *fifo, void *buf,
469 if (fifo->in == fifo->out)
472 return kfifo_out_copy_r(fifo, buf, len, recsize, &n);
476 unsigned int __kfifo_out_r(struct __kfifo *fifo, void *buf,
481 if (fifo->in == fifo->out)
484 len = kfifo_out_copy_r(fifo, buf, len, recsize, &n);
485 fifo->out += n + recsize;
490 void __kfifo_skip_r(struct __kfifo *fifo, size_t recsize)
494 n = __kfifo_peek_n(fifo, recsize);
495 fifo->out += n + recsize;
499 int __kfifo_from_user_r(struct __kfifo *fifo, const void __user *from,
506 if (len + recsize > kfifo_unused(fifo)) {
511 __kfifo_poke_n(fifo, len, recsize);
513 ret = kfifo_copy_from_user(fifo, from, len, fifo->in + recsize, copied);
518 fifo->in += len + recsize;
523 int __kfifo_to_user_r(struct __kfifo *fifo, void __user *to,
529 if (fifo->in == fifo->out) {
534 n = __kfifo_peek_n(fifo, recsize);
538 ret = kfifo_copy_to_user(fifo, to, len, fifo->out + recsize, copied);
543 fifo->out += n + recsize;
548 unsigned int __kfifo_dma_in_prepare_r(struct __kfifo *fifo,
555 if (len + recsize > kfifo_unused(fifo))
558 return setup_sgl(fifo, sgl, nents, len, fifo->in + recsize);
562 void __kfifo_dma_in_finish_r(struct __kfifo *fifo,
566 __kfifo_poke_n(fifo, len, recsize);
567 fifo->in += len + recsize;
571 unsigned int __kfifo_dma_out_prepare_r(struct __kfifo *fifo,
578 if (len + recsize > fifo->in - fifo->out)
581 return setup_sgl(fifo, sgl, nents, len, fifo->out + recsize);
585 void __kfifo_dma_out_finish_r(struct __kfifo *fifo, size_t recsize)
589 len = __kfifo_peek_n(fifo, recsize);
590 fifo->out += len + recsize;