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kernel/kfifo.c
12.7 KB
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/* |
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* A generic kernel FIFO implementation |
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* |
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* Copyright (C) 2009/2010 Stefani Seibold <stefani@seibold.net> |
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* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/err.h> |
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#include <linux/log2.h> |
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#include <linux/uaccess.h> |
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#include <linux/kfifo.h> |
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|
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/* * internal helper to calculate the unused elements in a fifo |
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*/ |
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static inline unsigned int kfifo_unused(struct __kfifo *fifo) |
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{ |
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return (fifo->mask + 1) - (fifo->in - fifo->out); |
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} |
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|
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int __kfifo_alloc(struct __kfifo *fifo, unsigned int size, size_t esize, gfp_t gfp_mask) |
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{ |
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/* |
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* round down to the next power of 2, since our 'let the indices |
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* wrap' technique works only in this case. |
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*/ |
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if (!is_power_of_2(size)) size = rounddown_pow_of_two(size); fifo->in = 0; fifo->out = 0; fifo->esize = esize; if (size < 2) { fifo->data = NULL; fifo->mask = 0; return -EINVAL; |
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} |
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fifo->data = kmalloc(size * esize, gfp_mask); if (!fifo->data) { fifo->mask = 0; |
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return -ENOMEM; } |
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fifo->mask = size - 1; |
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|
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return 0; |
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} |
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EXPORT_SYMBOL(__kfifo_alloc); |
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|
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void __kfifo_free(struct __kfifo *fifo) |
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{ |
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kfree(fifo->data); fifo->in = 0; fifo->out = 0; fifo->esize = 0; fifo->data = NULL; fifo->mask = 0; |
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} |
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EXPORT_SYMBOL(__kfifo_free); |
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|
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int __kfifo_init(struct __kfifo *fifo, void *buffer, unsigned int size, size_t esize) |
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{ |
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size /= esize; if (!is_power_of_2(size)) size = rounddown_pow_of_two(size); fifo->in = 0; fifo->out = 0; fifo->esize = esize; fifo->data = buffer; if (size < 2) { fifo->mask = 0; return -EINVAL; |
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} |
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fifo->mask = size - 1; return 0; |
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} |
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EXPORT_SYMBOL(__kfifo_init); |
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|
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static void kfifo_copy_in(struct __kfifo *fifo, const void *src, unsigned int len, unsigned int off) |
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{ |
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unsigned int size = fifo->mask + 1; unsigned int esize = fifo->esize; |
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unsigned int l; |
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off &= fifo->mask; if (esize != 1) { off *= esize; size *= esize; len *= esize; } l = min(len, size - off); memcpy(fifo->data + off, src, l); memcpy(fifo->data, src + l, len - l); |
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/* |
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* make sure that the data in the fifo is up to date before * incrementing the fifo->in index counter |
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*/ |
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smp_wmb(); } |
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unsigned int __kfifo_in(struct __kfifo *fifo, const void *buf, unsigned int len) { unsigned int l; |
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l = kfifo_unused(fifo); if (len > l) len = l; |
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|
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kfifo_copy_in(fifo, buf, len, fifo->in); fifo->in += len; return len; |
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} |
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EXPORT_SYMBOL(__kfifo_in); |
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|
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static void kfifo_copy_out(struct __kfifo *fifo, void *dst, unsigned int len, unsigned int off) |
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{ |
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unsigned int size = fifo->mask + 1; unsigned int esize = fifo->esize; |
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unsigned int l; |
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off &= fifo->mask; if (esize != 1) { off *= esize; size *= esize; len *= esize; } l = min(len, size - off); memcpy(dst, fifo->data + off, l); memcpy(dst + l, fifo->data, len - l); |
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/* |
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* make sure that the data is copied before * incrementing the fifo->out index counter |
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*/ |
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smp_wmb(); } |
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unsigned int __kfifo_out_peek(struct __kfifo *fifo, void *buf, unsigned int len) { unsigned int l; |
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l = fifo->in - fifo->out; if (len > l) len = l; |
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kfifo_copy_out(fifo, buf, len, fifo->out); return len; } EXPORT_SYMBOL(__kfifo_out_peek); |
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unsigned int __kfifo_out(struct __kfifo *fifo, void *buf, unsigned int len) { len = __kfifo_out_peek(fifo, buf, len); fifo->out += len; return len; |
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} |
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EXPORT_SYMBOL(__kfifo_out); |
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static unsigned long kfifo_copy_from_user(struct __kfifo *fifo, const void __user *from, unsigned int len, unsigned int off, unsigned int *copied) |
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{ |
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unsigned int size = fifo->mask + 1; unsigned int esize = fifo->esize; |
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unsigned int l; |
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unsigned long ret; |
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off &= fifo->mask; if (esize != 1) { off *= esize; size *= esize; len *= esize; } l = min(len, size - off); ret = copy_from_user(fifo->data + off, from, l); if (unlikely(ret)) ret = DIV_ROUND_UP(ret + len - l, esize); else { ret = copy_from_user(fifo->data, from + l, len - l); if (unlikely(ret)) ret = DIV_ROUND_UP(ret, esize); } |
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/* |
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* make sure that the data in the fifo is up to date before * incrementing the fifo->in index counter |
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*/ |
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smp_wmb(); *copied = len - ret; /* return the number of elements which are not copied */ return ret; } |
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int __kfifo_from_user(struct __kfifo *fifo, const void __user *from, unsigned long len, unsigned int *copied) { unsigned int l; unsigned long ret; unsigned int esize = fifo->esize; int err; |
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if (esize != 1) len /= esize; |
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l = kfifo_unused(fifo); if (len > l) len = l; |
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ret = kfifo_copy_from_user(fifo, from, len, fifo->in, copied); if (unlikely(ret)) { len -= ret; err = -EFAULT; } else err = 0; fifo->in += len; return err; |
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} |
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EXPORT_SYMBOL(__kfifo_from_user); |
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static unsigned long kfifo_copy_to_user(struct __kfifo *fifo, void __user *to, unsigned int len, unsigned int off, unsigned int *copied) |
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{ unsigned int l; |
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unsigned long ret; unsigned int size = fifo->mask + 1; unsigned int esize = fifo->esize; off &= fifo->mask; if (esize != 1) { off *= esize; size *= esize; len *= esize; } l = min(len, size - off); ret = copy_to_user(to, fifo->data + off, l); if (unlikely(ret)) ret = DIV_ROUND_UP(ret + len - l, esize); else { ret = copy_to_user(to + l, fifo->data, len - l); if (unlikely(ret)) ret = DIV_ROUND_UP(ret, esize); } |
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/* |
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* make sure that the data is copied before * incrementing the fifo->out index counter |
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*/ |
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smp_wmb(); *copied = len - ret; /* return the number of elements which are not copied */ return ret; } |
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int __kfifo_to_user(struct __kfifo *fifo, void __user *to, unsigned long len, unsigned int *copied) { unsigned int l; unsigned long ret; unsigned int esize = fifo->esize; int err; |
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if (esize != 1) len /= esize; |
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l = fifo->in - fifo->out; if (len > l) len = l; ret = kfifo_copy_to_user(fifo, to, len, fifo->out, copied); |
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if (unlikely(ret)) { |
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len -= ret; err = -EFAULT; } else err = 0; fifo->out += len; return err; } EXPORT_SYMBOL(__kfifo_to_user); |
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static int setup_sgl_buf(struct scatterlist *sgl, void *buf, int nents, unsigned int len) { int n; unsigned int l; unsigned int off; struct page *page; if (!nents) return 0; if (!len) return 0; n = 0; page = virt_to_page(buf); off = offset_in_page(buf); l = 0; while (len >= l + PAGE_SIZE - off) { struct page *npage; l += PAGE_SIZE; buf += PAGE_SIZE; npage = virt_to_page(buf); if (page_to_phys(page) != page_to_phys(npage) - l) { |
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sg_set_page(sgl, page, l - off, off); sgl = sg_next(sgl); if (++n == nents || sgl == NULL) |
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return n; page = npage; len -= l - off; l = off = 0; } |
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} |
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sg_set_page(sgl, page, len, off); |
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return n + 1; |
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} |
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static unsigned int setup_sgl(struct __kfifo *fifo, struct scatterlist *sgl, int nents, unsigned int len, unsigned int off) |
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{ |
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unsigned int size = fifo->mask + 1; unsigned int esize = fifo->esize; unsigned int l; unsigned int n; |
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off &= fifo->mask; if (esize != 1) { off *= esize; size *= esize; len *= esize; } l = min(len, size - off); |
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n = setup_sgl_buf(sgl, fifo->data + off, nents, l); |
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n += setup_sgl_buf(sgl + n, fifo->data, nents - n, len - l); |
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return n; |
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} |
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unsigned int __kfifo_dma_in_prepare(struct __kfifo *fifo, struct scatterlist *sgl, int nents, unsigned int len) |
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{ |
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unsigned int l; |
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l = kfifo_unused(fifo); if (len > l) len = l; return setup_sgl(fifo, sgl, nents, len, fifo->in); |
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} |
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EXPORT_SYMBOL(__kfifo_dma_in_prepare); |
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unsigned int __kfifo_dma_out_prepare(struct __kfifo *fifo, struct scatterlist *sgl, int nents, unsigned int len) |
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{ |
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unsigned int l; l = fifo->in - fifo->out; if (len > l) len = l; return setup_sgl(fifo, sgl, nents, len, fifo->out); |
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} |
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EXPORT_SYMBOL(__kfifo_dma_out_prepare); |
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unsigned int __kfifo_max_r(unsigned int len, size_t recsize) |
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{ |
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unsigned int max = (1 << (recsize << 3)) - 1; |
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if (len > max) return max; return len; |
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} |
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#define __KFIFO_PEEK(data, out, mask) \ ((data)[(out) & (mask)]) /* * __kfifo_peek_n internal helper function for determinate the length of * the next record in the fifo |
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*/ |
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static unsigned int __kfifo_peek_n(struct __kfifo *fifo, size_t recsize) |
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{ |
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unsigned int l; unsigned int mask = fifo->mask; unsigned char *data = fifo->data; |
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l = __KFIFO_PEEK(data, fifo->out, mask); |
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if (--recsize) l |= __KFIFO_PEEK(data, fifo->out + 1, mask) << 8; return l; |
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} |
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#define __KFIFO_POKE(data, in, mask, val) \ ( \ (data)[(in) & (mask)] = (unsigned char)(val) \ ) /* * __kfifo_poke_n internal helper function for storeing the length of * the record into the fifo |
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*/ |
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static void __kfifo_poke_n(struct __kfifo *fifo, unsigned int n, size_t recsize) |
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{ |
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unsigned int mask = fifo->mask; unsigned char *data = fifo->data; |
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__KFIFO_POKE(data, fifo->in, mask, n); if (recsize > 1) __KFIFO_POKE(data, fifo->in + 1, mask, n >> 8); |
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} |
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unsigned int __kfifo_len_r(struct __kfifo *fifo, size_t recsize) |
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{ |
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return __kfifo_peek_n(fifo, recsize); |
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} |
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EXPORT_SYMBOL(__kfifo_len_r); |
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unsigned int __kfifo_in_r(struct __kfifo *fifo, const void *buf, unsigned int len, size_t recsize) |
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{ |
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if (len + recsize > kfifo_unused(fifo)) return 0; |
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__kfifo_poke_n(fifo, len, recsize); |
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kfifo_copy_in(fifo, buf, len, fifo->in + recsize); fifo->in += len + recsize; return len; |
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} |
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EXPORT_SYMBOL(__kfifo_in_r); static unsigned int kfifo_out_copy_r(struct __kfifo *fifo, void *buf, unsigned int len, size_t recsize, unsigned int *n) |
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{ |
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*n = __kfifo_peek_n(fifo, recsize); if (len > *n) len = *n; kfifo_copy_out(fifo, buf, len, fifo->out + recsize); return len; } unsigned int __kfifo_out_peek_r(struct __kfifo *fifo, void *buf, unsigned int len, size_t recsize) { unsigned int n; if (fifo->in == fifo->out) return 0; return kfifo_out_copy_r(fifo, buf, len, recsize, &n); |
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} |
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EXPORT_SYMBOL(__kfifo_out_peek_r); |
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unsigned int __kfifo_out_r(struct __kfifo *fifo, void *buf, unsigned int len, size_t recsize) |
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unsigned int n; if (fifo->in == fifo->out) return 0; len = kfifo_out_copy_r(fifo, buf, len, recsize, &n); fifo->out += n + recsize; return len; |
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EXPORT_SYMBOL(__kfifo_out_r); |
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void __kfifo_skip_r(struct __kfifo *fifo, size_t recsize) { unsigned int n; n = __kfifo_peek_n(fifo, recsize); fifo->out += n + recsize; } EXPORT_SYMBOL(__kfifo_skip_r); |
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int __kfifo_from_user_r(struct __kfifo *fifo, const void __user *from, unsigned long len, unsigned int *copied, size_t recsize) |
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{ |
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unsigned long ret; |
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len = __kfifo_max_r(len, recsize); |
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if (len + recsize > kfifo_unused(fifo)) { *copied = 0; return 0; } |
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__kfifo_poke_n(fifo, len, recsize); |
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ret = kfifo_copy_from_user(fifo, from, len, fifo->in + recsize, copied); if (unlikely(ret)) { *copied = 0; return -EFAULT; } fifo->in += len + recsize; return 0; |
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EXPORT_SYMBOL(__kfifo_from_user_r); int __kfifo_to_user_r(struct __kfifo *fifo, void __user *to, unsigned long len, unsigned int *copied, size_t recsize) |
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{ |
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unsigned long ret; unsigned int n; if (fifo->in == fifo->out) { *copied = 0; return 0; } n = __kfifo_peek_n(fifo, recsize); if (len > n) len = n; ret = kfifo_copy_to_user(fifo, to, len, fifo->out + recsize, copied); if (unlikely(ret)) { *copied = 0; return -EFAULT; } fifo->out += n + recsize; return 0; |
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} |
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EXPORT_SYMBOL(__kfifo_to_user_r); |
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unsigned int __kfifo_dma_in_prepare_r(struct __kfifo *fifo, struct scatterlist *sgl, int nents, unsigned int len, size_t recsize) |
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{ |
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if (!nents) BUG(); len = __kfifo_max_r(len, recsize); if (len + recsize > kfifo_unused(fifo)) return 0; return setup_sgl(fifo, sgl, nents, len, fifo->in + recsize); |
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} |
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EXPORT_SYMBOL(__kfifo_dma_in_prepare_r); |
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void __kfifo_dma_in_finish_r(struct __kfifo *fifo, unsigned int len, size_t recsize) |
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{ |
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len = __kfifo_max_r(len, recsize); __kfifo_poke_n(fifo, len, recsize); fifo->in += len + recsize; |
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} |
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EXPORT_SYMBOL(__kfifo_dma_in_finish_r); |
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unsigned int __kfifo_dma_out_prepare_r(struct __kfifo *fifo, struct scatterlist *sgl, int nents, unsigned int len, size_t recsize) |
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{ |
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if (!nents) BUG(); len = __kfifo_max_r(len, recsize); if (len + recsize > fifo->in - fifo->out) return 0; return setup_sgl(fifo, sgl, nents, len, fifo->out + recsize); |
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} |
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EXPORT_SYMBOL(__kfifo_dma_out_prepare_r); void __kfifo_dma_out_finish_r(struct __kfifo *fifo, size_t recsize) { unsigned int len; |
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len = __kfifo_peek_n(fifo, recsize); fifo->out += len + recsize; } EXPORT_SYMBOL(__kfifo_dma_out_finish_r); |