33 static inline unsigned int kfifo_unused(struct __kfifo *fifo)  in kfifo_unused()  argument
35 	return (fifo->mask + 1) - (fifo->in - fifo->out);  in kfifo_unused()
38 int __kfifo_alloc(struct __kfifo *fifo, unsigned int size,  in __kfifo_alloc()  argument
47 	fifo->in = 0;  in __kfifo_alloc()
48 	fifo->out = 0;  in __kfifo_alloc()
49 	fifo->esize = esize;  in __kfifo_alloc()
52 		fifo->data = NULL;  in __kfifo_alloc()
53 		fifo->mask = 0;  in __kfifo_alloc()
57 	fifo->data = kmalloc(size * esize, gfp_mask);  in __kfifo_alloc()
59 	if (!fifo->data) {  in __kfifo_alloc()
60 		fifo->mask = 0;  in __kfifo_alloc()
63 	fifo->mask = size - 1;  in __kfifo_alloc()
69 void __kfifo_free(struct __kfifo *fifo)  in __kfifo_free()  argument
71 	kfree(fifo->data);  in __kfifo_free()
72 	fifo->in = 0;  in __kfifo_free()
73 	fifo->out = 0;  in __kfifo_free()
74 	fifo->esize = 0;  in __kfifo_free()
75 	fifo->data = NULL;  in __kfifo_free()
76 	fifo->mask = 0;  in __kfifo_free()
80 int __kfifo_init(struct __kfifo *fifo, void *buffer,  in __kfifo_init()  argument
87 	fifo->in = 0;  in __kfifo_init()
88 	fifo->out = 0;  in __kfifo_init()
89 	fifo->esize = esize;  in __kfifo_init()
90 	fifo->data = buffer;  in __kfifo_init()
93 		fifo->mask = 0;  in __kfifo_init()
96 	fifo->mask = size - 1;  in __kfifo_init()
102 static void kfifo_copy_in(struct __kfifo *fifo, const void *src,  in kfifo_copy_in()  argument
105 	unsigned int size = fifo->mask + 1;  in kfifo_copy_in()
106 	unsigned int esize = fifo->esize;  in kfifo_copy_in()
109 	off &= fifo->mask;  in kfifo_copy_in()
117 	memcpy(fifo->data + off, src, l);  in kfifo_copy_in()
118 	memcpy(fifo->data, src + l, len - l);  in kfifo_copy_in()
126 unsigned int __kfifo_in(struct __kfifo *fifo,  in __kfifo_in()  argument
131 	l = kfifo_unused(fifo);  in __kfifo_in()
135 	kfifo_copy_in(fifo, buf, len, fifo->in);  in __kfifo_in()
136 	fifo->in += len;  in __kfifo_in()
141 static void kfifo_copy_out(struct __kfifo *fifo, void *dst,  in kfifo_copy_out()  argument
144 	unsigned int size = fifo->mask + 1;  in kfifo_copy_out()
145 	unsigned int esize = fifo->esize;  in kfifo_copy_out()
148 	off &= fifo->mask;  in kfifo_copy_out()
156 	memcpy(dst, fifo->data + off, l);  in kfifo_copy_out()
157 	memcpy(dst + l, fifo->data, len - l);  in kfifo_copy_out()
165 unsigned int __kfifo_out_peek(struct __kfifo *fifo,  in __kfifo_out_peek()  argument
170 	l = fifo->in - fifo->out;  in __kfifo_out_peek()
174 	kfifo_copy_out(fifo, buf, len, fifo->out);  in __kfifo_out_peek()
179 unsigned int __kfifo_out(struct __kfifo *fifo,  in __kfifo_out()  argument
182 	len = __kfifo_out_peek(fifo, buf, len);  in __kfifo_out()
183 	fifo->out += len;  in __kfifo_out()
188 static unsigned long kfifo_copy_from_user(struct __kfifo *fifo,  in kfifo_copy_from_user()  argument
192 	unsigned int size = fifo->mask + 1;  in kfifo_copy_from_user()
193 	unsigned int esize = fifo->esize;  in kfifo_copy_from_user()
197 	off &= fifo->mask;  in kfifo_copy_from_user()
205 	ret = copy_from_user(fifo->data + off, from, l);  in kfifo_copy_from_user()
209 		ret = copy_from_user(fifo->data, from + l, len - l);  in kfifo_copy_from_user()
223 int __kfifo_from_user(struct __kfifo *fifo, const void __user *from,  in __kfifo_from_user()  argument
228 	unsigned int esize = fifo->esize;  in __kfifo_from_user()
234 	l = kfifo_unused(fifo);  in __kfifo_from_user()
238 	ret = kfifo_copy_from_user(fifo, from, len, fifo->in, copied);  in __kfifo_from_user()
244 	fifo->in += len;  in __kfifo_from_user()
249 static unsigned long kfifo_copy_to_user(struct __kfifo *fifo, void __user *to,  in kfifo_copy_to_user()  argument
254 	unsigned int size = fifo->mask + 1;  in kfifo_copy_to_user()
255 	unsigned int esize = fifo->esize;  in kfifo_copy_to_user()
257 	off &= fifo->mask;  in kfifo_copy_to_user()
265 	ret = copy_to_user(to, fifo->data + off, l);  in kfifo_copy_to_user()
269 		ret = copy_to_user(to + l, fifo->data, len - l);  in kfifo_copy_to_user()
283 int __kfifo_to_user(struct __kfifo *fifo, void __user *to,  in __kfifo_to_user()  argument
288 	unsigned int esize = fifo->esize;  in __kfifo_to_user()
294 	l = fifo->in - fifo->out;  in __kfifo_to_user()
297 	ret = kfifo_copy_to_user(fifo, to, len, fifo->out, copied);  in __kfifo_to_user()
303 	fifo->out += len;  in __kfifo_to_user()
347 static unsigned int setup_sgl(struct __kfifo *fifo, struct scatterlist *sgl,  in setup_sgl()  argument
350 	unsigned int size = fifo->mask + 1;  in setup_sgl()
351 	unsigned int esize = fifo->esize;  in setup_sgl()
355 	off &= fifo->mask;  in setup_sgl()
363 	n = setup_sgl_buf(sgl, fifo->data + off, nents, l);  in setup_sgl()
364 	n += setup_sgl_buf(sgl + n, fifo->data, nents - n, len - l);  in setup_sgl()
369 unsigned int __kfifo_dma_in_prepare(struct __kfifo *fifo,  in __kfifo_dma_in_prepare()  argument
374 	l = kfifo_unused(fifo);  in __kfifo_dma_in_prepare()
378 	return setup_sgl(fifo, sgl, nents, len, fifo->in);  in __kfifo_dma_in_prepare()
382 unsigned int __kfifo_dma_out_prepare(struct __kfifo *fifo,  in __kfifo_dma_out_prepare()  argument
387 	l = fifo->in - fifo->out;  in __kfifo_dma_out_prepare()
391 	return setup_sgl(fifo, sgl, nents, len, fifo->out);  in __kfifo_dma_out_prepare()
411 static unsigned int __kfifo_peek_n(struct __kfifo *fifo, size_t recsize)  in __kfifo_peek_n()  argument
414 	unsigned int mask = fifo->mask;  in __kfifo_peek_n()
415 	unsigned char *data = fifo->data;  in __kfifo_peek_n()
417 	l = __KFIFO_PEEK(data, fifo->out, mask);  in __kfifo_peek_n()
420 		l |= __KFIFO_PEEK(data, fifo->out + 1, mask) << 8;  in __kfifo_peek_n()
434 static void __kfifo_poke_n(struct __kfifo *fifo, unsigned int n, size_t recsize)  in __kfifo_poke_n()  argument
436 	unsigned int mask = fifo->mask;  in __kfifo_poke_n()
437 	unsigned char *data = fifo->data;  in __kfifo_poke_n()
439 	__KFIFO_POKE(data, fifo->in, mask, n);  in __kfifo_poke_n()
442 		__KFIFO_POKE(data, fifo->in + 1, mask, n >> 8);  in __kfifo_poke_n()
445 unsigned int __kfifo_len_r(struct __kfifo *fifo, size_t recsize)  in __kfifo_len_r()  argument
447 	return __kfifo_peek_n(fifo, recsize);  in __kfifo_len_r()
451 unsigned int __kfifo_in_r(struct __kfifo *fifo, const void *buf,  in __kfifo_in_r()  argument
454 	if (len + recsize > kfifo_unused(fifo))  in __kfifo_in_r()
457 	__kfifo_poke_n(fifo, len, recsize);  in __kfifo_in_r()
459 	kfifo_copy_in(fifo, buf, len, fifo->in + recsize);  in __kfifo_in_r()
460 	fifo->in += len + recsize;  in __kfifo_in_r()
465 static unsigned int kfifo_out_copy_r(struct __kfifo *fifo,  in kfifo_out_copy_r()  argument
468 	*n = __kfifo_peek_n(fifo, recsize);  in kfifo_out_copy_r()
473 	kfifo_copy_out(fifo, buf, len, fifo->out + recsize);  in kfifo_out_copy_r()
477 unsigned int __kfifo_out_peek_r(struct __kfifo *fifo, void *buf,  in __kfifo_out_peek_r()  argument
482 	if (fifo->in == fifo->out)  in __kfifo_out_peek_r()
485 	return kfifo_out_copy_r(fifo, buf, len, recsize, &n);  in __kfifo_out_peek_r()
489 unsigned int __kfifo_out_r(struct __kfifo *fifo, void *buf,  in __kfifo_out_r()  argument
494 	if (fifo->in == fifo->out)  in __kfifo_out_r()
497 	len = kfifo_out_copy_r(fifo, buf, len, recsize, &n);  in __kfifo_out_r()
498 	fifo->out += n + recsize;  in __kfifo_out_r()
503 void __kfifo_skip_r(struct __kfifo *fifo, size_t recsize)  in __kfifo_skip_r()  argument
507 	n = __kfifo_peek_n(fifo, recsize);  in __kfifo_skip_r()
508 	fifo->out += n + recsize;  in __kfifo_skip_r()
512 int __kfifo_from_user_r(struct __kfifo *fifo, const void __user *from,  in __kfifo_from_user_r()  argument
519 	if (len + recsize > kfifo_unused(fifo)) {  in __kfifo_from_user_r()
524 	__kfifo_poke_n(fifo, len, recsize);  in __kfifo_from_user_r()
526 	ret = kfifo_copy_from_user(fifo, from, len, fifo->in + recsize, copied);  in __kfifo_from_user_r()
531 	fifo->in += len + recsize;  in __kfifo_from_user_r()
536 int __kfifo_to_user_r(struct __kfifo *fifo, void __user *to,  in __kfifo_to_user_r()  argument
542 	if (fifo->in == fifo->out) {  in __kfifo_to_user_r()
547 	n = __kfifo_peek_n(fifo, recsize);  in __kfifo_to_user_r()
551 	ret = kfifo_copy_to_user(fifo, to, len, fifo->out + recsize, copied);  in __kfifo_to_user_r()
556 	fifo->out += n + recsize;  in __kfifo_to_user_r()
561 unsigned int __kfifo_dma_in_prepare_r(struct __kfifo *fifo,  in __kfifo_dma_in_prepare_r()  argument
568 	if (len + recsize > kfifo_unused(fifo))  in __kfifo_dma_in_prepare_r()
571 	return setup_sgl(fifo, sgl, nents, len, fifo->in + recsize);  in __kfifo_dma_in_prepare_r()
575 void __kfifo_dma_in_finish_r(struct __kfifo *fifo,  in __kfifo_dma_in_finish_r()  argument
579 	__kfifo_poke_n(fifo, len, recsize);  in __kfifo_dma_in_finish_r()
580 	fifo->in += len + recsize;  in __kfifo_dma_in_finish_r()
584 unsigned int __kfifo_dma_out_prepare_r(struct __kfifo *fifo,  in __kfifo_dma_out_prepare_r()  argument
591 	if (len + recsize > fifo->in - fifo->out)  in __kfifo_dma_out_prepare_r()
594 	return setup_sgl(fifo, sgl, nents, len, fifo->out + recsize);  in __kfifo_dma_out_prepare_r()
598 void __kfifo_dma_out_finish_r(struct __kfifo *fifo, size_t recsize)  in __kfifo_dma_out_finish_r()  argument
602 	len = __kfifo_peek_n(fifo, recsize);  in __kfifo_dma_out_finish_r()
603 	fifo->out += len + recsize;  in __kfifo_dma_out_finish_r()