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Pull "trivial tree" updates from Jiri Kosina: "Usual pile from trivial tree everyone is so eagerly waiting for" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (39 commits) Remove MN10300_PROC_MN2WS0038 mei: fix comments treewide: Fix typos in Kconfig kprobes: update jprobe_example.c for do_fork() change Documentation: change "&" to "and" in Documentation/applying-patches.txt Documentation: remove obsolete pcmcia-cs from Changes Documentation: update links in Changes Documentation: Docbook: Fix generated DocBook/kernel-api.xml score: Remove GENERIC_HAS_IOMAP gpio: fix 'CONFIG_GPIO_IRQCHIP' comments tty: doc: Fix grammar in serial/tty dma-debug: modify check_for_stack output treewide: fix errors in printk genirq: fix reference in devm_request_threaded_irq comment treewide: fix synchronize_rcu() in comments checkstack.pl: port to AArch64 doc: queue-sysfs: minor fixes init/do_mounts: better syntax description MIPS: fix comment spelling powerpc/simpleboot: fix comment ...
1187 lines
35 KiB
C
1187 lines
35 KiB
C
/*
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* lib/bitmap.c
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* Helper functions for bitmap.h.
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#include <linux/export.h>
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#include <linux/thread_info.h>
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#include <linux/ctype.h>
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#include <linux/errno.h>
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#include <linux/bitmap.h>
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#include <linux/bitops.h>
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#include <linux/bug.h>
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#include <asm/uaccess.h>
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/*
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* bitmaps provide an array of bits, implemented using an an
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* array of unsigned longs. The number of valid bits in a
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* given bitmap does _not_ need to be an exact multiple of
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* BITS_PER_LONG.
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*
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* The possible unused bits in the last, partially used word
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* of a bitmap are 'don't care'. The implementation makes
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* no particular effort to keep them zero. It ensures that
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* their value will not affect the results of any operation.
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* The bitmap operations that return Boolean (bitmap_empty,
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* for example) or scalar (bitmap_weight, for example) results
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* carefully filter out these unused bits from impacting their
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* results.
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*
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* These operations actually hold to a slightly stronger rule:
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* if you don't input any bitmaps to these ops that have some
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* unused bits set, then they won't output any set unused bits
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* in output bitmaps.
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*
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* The byte ordering of bitmaps is more natural on little
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* endian architectures. See the big-endian headers
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* include/asm-ppc64/bitops.h and include/asm-s390/bitops.h
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* for the best explanations of this ordering.
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*/
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int __bitmap_empty(const unsigned long *bitmap, unsigned int bits)
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{
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unsigned int k, lim = bits/BITS_PER_LONG;
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for (k = 0; k < lim; ++k)
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if (bitmap[k])
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return 0;
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if (bits % BITS_PER_LONG)
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if (bitmap[k] & BITMAP_LAST_WORD_MASK(bits))
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return 0;
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return 1;
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}
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EXPORT_SYMBOL(__bitmap_empty);
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int __bitmap_full(const unsigned long *bitmap, unsigned int bits)
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{
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unsigned int k, lim = bits/BITS_PER_LONG;
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for (k = 0; k < lim; ++k)
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if (~bitmap[k])
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return 0;
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if (bits % BITS_PER_LONG)
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if (~bitmap[k] & BITMAP_LAST_WORD_MASK(bits))
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return 0;
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return 1;
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}
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EXPORT_SYMBOL(__bitmap_full);
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int __bitmap_equal(const unsigned long *bitmap1,
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const unsigned long *bitmap2, unsigned int bits)
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{
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unsigned int k, lim = bits/BITS_PER_LONG;
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for (k = 0; k < lim; ++k)
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if (bitmap1[k] != bitmap2[k])
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return 0;
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if (bits % BITS_PER_LONG)
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if ((bitmap1[k] ^ bitmap2[k]) & BITMAP_LAST_WORD_MASK(bits))
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return 0;
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return 1;
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}
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EXPORT_SYMBOL(__bitmap_equal);
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void __bitmap_complement(unsigned long *dst, const unsigned long *src, unsigned int bits)
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{
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unsigned int k, lim = bits/BITS_PER_LONG;
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for (k = 0; k < lim; ++k)
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dst[k] = ~src[k];
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if (bits % BITS_PER_LONG)
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dst[k] = ~src[k];
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}
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EXPORT_SYMBOL(__bitmap_complement);
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/**
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* __bitmap_shift_right - logical right shift of the bits in a bitmap
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* @dst : destination bitmap
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* @src : source bitmap
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* @shift : shift by this many bits
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* @bits : bitmap size, in bits
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*
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* Shifting right (dividing) means moving bits in the MS -> LS bit
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* direction. Zeros are fed into the vacated MS positions and the
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* LS bits shifted off the bottom are lost.
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*/
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void __bitmap_shift_right(unsigned long *dst,
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const unsigned long *src, int shift, int bits)
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{
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int k, lim = BITS_TO_LONGS(bits), left = bits % BITS_PER_LONG;
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int off = shift/BITS_PER_LONG, rem = shift % BITS_PER_LONG;
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unsigned long mask = (1UL << left) - 1;
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for (k = 0; off + k < lim; ++k) {
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unsigned long upper, lower;
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/*
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* If shift is not word aligned, take lower rem bits of
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* word above and make them the top rem bits of result.
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*/
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if (!rem || off + k + 1 >= lim)
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upper = 0;
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else {
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upper = src[off + k + 1];
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if (off + k + 1 == lim - 1 && left)
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upper &= mask;
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}
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lower = src[off + k];
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if (left && off + k == lim - 1)
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lower &= mask;
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dst[k] = upper << (BITS_PER_LONG - rem) | lower >> rem;
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if (left && k == lim - 1)
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dst[k] &= mask;
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}
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if (off)
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memset(&dst[lim - off], 0, off*sizeof(unsigned long));
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}
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EXPORT_SYMBOL(__bitmap_shift_right);
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/**
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* __bitmap_shift_left - logical left shift of the bits in a bitmap
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* @dst : destination bitmap
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* @src : source bitmap
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* @shift : shift by this many bits
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* @bits : bitmap size, in bits
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*
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* Shifting left (multiplying) means moving bits in the LS -> MS
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* direction. Zeros are fed into the vacated LS bit positions
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* and those MS bits shifted off the top are lost.
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*/
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void __bitmap_shift_left(unsigned long *dst,
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const unsigned long *src, int shift, int bits)
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{
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int k, lim = BITS_TO_LONGS(bits), left = bits % BITS_PER_LONG;
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int off = shift/BITS_PER_LONG, rem = shift % BITS_PER_LONG;
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for (k = lim - off - 1; k >= 0; --k) {
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unsigned long upper, lower;
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/*
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* If shift is not word aligned, take upper rem bits of
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* word below and make them the bottom rem bits of result.
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*/
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if (rem && k > 0)
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lower = src[k - 1];
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else
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lower = 0;
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upper = src[k];
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if (left && k == lim - 1)
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upper &= (1UL << left) - 1;
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dst[k + off] = lower >> (BITS_PER_LONG - rem) | upper << rem;
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if (left && k + off == lim - 1)
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dst[k + off] &= (1UL << left) - 1;
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}
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if (off)
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memset(dst, 0, off*sizeof(unsigned long));
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}
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EXPORT_SYMBOL(__bitmap_shift_left);
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int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
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const unsigned long *bitmap2, unsigned int bits)
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{
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unsigned int k;
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unsigned int lim = bits/BITS_PER_LONG;
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unsigned long result = 0;
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for (k = 0; k < lim; k++)
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result |= (dst[k] = bitmap1[k] & bitmap2[k]);
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if (bits % BITS_PER_LONG)
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result |= (dst[k] = bitmap1[k] & bitmap2[k] &
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BITMAP_LAST_WORD_MASK(bits));
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return result != 0;
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}
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EXPORT_SYMBOL(__bitmap_and);
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void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
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const unsigned long *bitmap2, unsigned int bits)
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{
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unsigned int k;
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unsigned int nr = BITS_TO_LONGS(bits);
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for (k = 0; k < nr; k++)
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dst[k] = bitmap1[k] | bitmap2[k];
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}
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EXPORT_SYMBOL(__bitmap_or);
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void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1,
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const unsigned long *bitmap2, unsigned int bits)
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{
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unsigned int k;
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unsigned int nr = BITS_TO_LONGS(bits);
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for (k = 0; k < nr; k++)
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dst[k] = bitmap1[k] ^ bitmap2[k];
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}
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EXPORT_SYMBOL(__bitmap_xor);
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int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
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const unsigned long *bitmap2, unsigned int bits)
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{
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unsigned int k;
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unsigned int lim = bits/BITS_PER_LONG;
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unsigned long result = 0;
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for (k = 0; k < lim; k++)
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result |= (dst[k] = bitmap1[k] & ~bitmap2[k]);
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if (bits % BITS_PER_LONG)
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result |= (dst[k] = bitmap1[k] & ~bitmap2[k] &
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BITMAP_LAST_WORD_MASK(bits));
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return result != 0;
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}
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EXPORT_SYMBOL(__bitmap_andnot);
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int __bitmap_intersects(const unsigned long *bitmap1,
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const unsigned long *bitmap2, unsigned int bits)
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{
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unsigned int k, lim = bits/BITS_PER_LONG;
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for (k = 0; k < lim; ++k)
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if (bitmap1[k] & bitmap2[k])
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return 1;
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if (bits % BITS_PER_LONG)
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if ((bitmap1[k] & bitmap2[k]) & BITMAP_LAST_WORD_MASK(bits))
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return 1;
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return 0;
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}
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EXPORT_SYMBOL(__bitmap_intersects);
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int __bitmap_subset(const unsigned long *bitmap1,
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const unsigned long *bitmap2, unsigned int bits)
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{
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unsigned int k, lim = bits/BITS_PER_LONG;
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for (k = 0; k < lim; ++k)
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if (bitmap1[k] & ~bitmap2[k])
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return 0;
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if (bits % BITS_PER_LONG)
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if ((bitmap1[k] & ~bitmap2[k]) & BITMAP_LAST_WORD_MASK(bits))
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return 0;
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return 1;
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}
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EXPORT_SYMBOL(__bitmap_subset);
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int __bitmap_weight(const unsigned long *bitmap, unsigned int bits)
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{
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unsigned int k, lim = bits/BITS_PER_LONG;
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int w = 0;
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for (k = 0; k < lim; k++)
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w += hweight_long(bitmap[k]);
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if (bits % BITS_PER_LONG)
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w += hweight_long(bitmap[k] & BITMAP_LAST_WORD_MASK(bits));
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return w;
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}
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EXPORT_SYMBOL(__bitmap_weight);
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void bitmap_set(unsigned long *map, unsigned int start, int len)
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{
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unsigned long *p = map + BIT_WORD(start);
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const unsigned int size = start + len;
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int bits_to_set = BITS_PER_LONG - (start % BITS_PER_LONG);
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unsigned long mask_to_set = BITMAP_FIRST_WORD_MASK(start);
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while (len - bits_to_set >= 0) {
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*p |= mask_to_set;
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len -= bits_to_set;
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bits_to_set = BITS_PER_LONG;
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mask_to_set = ~0UL;
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p++;
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}
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if (len) {
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mask_to_set &= BITMAP_LAST_WORD_MASK(size);
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*p |= mask_to_set;
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}
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}
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EXPORT_SYMBOL(bitmap_set);
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void bitmap_clear(unsigned long *map, unsigned int start, int len)
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{
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unsigned long *p = map + BIT_WORD(start);
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const unsigned int size = start + len;
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int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG);
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unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start);
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while (len - bits_to_clear >= 0) {
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*p &= ~mask_to_clear;
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len -= bits_to_clear;
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bits_to_clear = BITS_PER_LONG;
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mask_to_clear = ~0UL;
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p++;
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}
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if (len) {
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mask_to_clear &= BITMAP_LAST_WORD_MASK(size);
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*p &= ~mask_to_clear;
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}
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}
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EXPORT_SYMBOL(bitmap_clear);
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/*
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* bitmap_find_next_zero_area - find a contiguous aligned zero area
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* @map: The address to base the search on
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* @size: The bitmap size in bits
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* @start: The bitnumber to start searching at
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* @nr: The number of zeroed bits we're looking for
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* @align_mask: Alignment mask for zero area
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*
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* The @align_mask should be one less than a power of 2; the effect is that
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* the bit offset of all zero areas this function finds is multiples of that
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* power of 2. A @align_mask of 0 means no alignment is required.
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*/
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unsigned long bitmap_find_next_zero_area(unsigned long *map,
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unsigned long size,
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unsigned long start,
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unsigned int nr,
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unsigned long align_mask)
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{
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unsigned long index, end, i;
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again:
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index = find_next_zero_bit(map, size, start);
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/* Align allocation */
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index = __ALIGN_MASK(index, align_mask);
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end = index + nr;
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if (end > size)
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return end;
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i = find_next_bit(map, end, index);
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if (i < end) {
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start = i + 1;
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goto again;
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}
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return index;
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}
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EXPORT_SYMBOL(bitmap_find_next_zero_area);
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/*
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* Bitmap printing & parsing functions: first version by Nadia Yvette Chambers,
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* second version by Paul Jackson, third by Joe Korty.
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*/
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#define CHUNKSZ 32
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#define nbits_to_hold_value(val) fls(val)
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#define BASEDEC 10 /* fancier cpuset lists input in decimal */
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/**
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* bitmap_scnprintf - convert bitmap to an ASCII hex string.
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* @buf: byte buffer into which string is placed
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* @buflen: reserved size of @buf, in bytes
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* @maskp: pointer to bitmap to convert
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* @nmaskbits: size of bitmap, in bits
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*
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* Exactly @nmaskbits bits are displayed. Hex digits are grouped into
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* comma-separated sets of eight digits per set. Returns the number of
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* characters which were written to *buf, excluding the trailing \0.
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*/
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int bitmap_scnprintf(char *buf, unsigned int buflen,
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const unsigned long *maskp, int nmaskbits)
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{
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int i, word, bit, len = 0;
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unsigned long val;
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const char *sep = "";
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int chunksz;
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u32 chunkmask;
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chunksz = nmaskbits & (CHUNKSZ - 1);
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if (chunksz == 0)
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chunksz = CHUNKSZ;
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i = ALIGN(nmaskbits, CHUNKSZ) - CHUNKSZ;
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for (; i >= 0; i -= CHUNKSZ) {
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chunkmask = ((1ULL << chunksz) - 1);
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word = i / BITS_PER_LONG;
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bit = i % BITS_PER_LONG;
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val = (maskp[word] >> bit) & chunkmask;
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len += scnprintf(buf+len, buflen-len, "%s%0*lx", sep,
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(chunksz+3)/4, val);
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chunksz = CHUNKSZ;
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sep = ",";
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}
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return len;
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}
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EXPORT_SYMBOL(bitmap_scnprintf);
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|
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/**
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* __bitmap_parse - convert an ASCII hex string into a bitmap.
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* @buf: pointer to buffer containing string.
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* @buflen: buffer size in bytes. If string is smaller than this
|
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* then it must be terminated with a \0.
|
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* @is_user: location of buffer, 0 indicates kernel space
|
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* @maskp: pointer to bitmap array that will contain result.
|
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* @nmaskbits: size of bitmap, in bits.
|
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*
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* Commas group hex digits into chunks. Each chunk defines exactly 32
|
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* bits of the resultant bitmask. No chunk may specify a value larger
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* than 32 bits (%-EOVERFLOW), and if a chunk specifies a smaller value
|
|
* then leading 0-bits are prepended. %-EINVAL is returned for illegal
|
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* characters and for grouping errors such as "1,,5", ",44", "," and "".
|
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* Leading and trailing whitespace accepted, but not embedded whitespace.
|
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*/
|
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int __bitmap_parse(const char *buf, unsigned int buflen,
|
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int is_user, unsigned long *maskp,
|
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int nmaskbits)
|
|
{
|
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int c, old_c, totaldigits, ndigits, nchunks, nbits;
|
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u32 chunk;
|
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const char __user __force *ubuf = (const char __user __force *)buf;
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|
|
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bitmap_zero(maskp, nmaskbits);
|
|
|
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nchunks = nbits = totaldigits = c = 0;
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do {
|
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chunk = ndigits = 0;
|
|
|
|
/* Get the next chunk of the bitmap */
|
|
while (buflen) {
|
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old_c = c;
|
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if (is_user) {
|
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if (__get_user(c, ubuf++))
|
|
return -EFAULT;
|
|
}
|
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else
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c = *buf++;
|
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buflen--;
|
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if (isspace(c))
|
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continue;
|
|
|
|
/*
|
|
* If the last character was a space and the current
|
|
* character isn't '\0', we've got embedded whitespace.
|
|
* This is a no-no, so throw an error.
|
|
*/
|
|
if (totaldigits && c && isspace(old_c))
|
|
return -EINVAL;
|
|
|
|
/* A '\0' or a ',' signal the end of the chunk */
|
|
if (c == '\0' || c == ',')
|
|
break;
|
|
|
|
if (!isxdigit(c))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Make sure there are at least 4 free bits in 'chunk'.
|
|
* If not, this hexdigit will overflow 'chunk', so
|
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* throw an error.
|
|
*/
|
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if (chunk & ~((1UL << (CHUNKSZ - 4)) - 1))
|
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return -EOVERFLOW;
|
|
|
|
chunk = (chunk << 4) | hex_to_bin(c);
|
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ndigits++; totaldigits++;
|
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}
|
|
if (ndigits == 0)
|
|
return -EINVAL;
|
|
if (nchunks == 0 && chunk == 0)
|
|
continue;
|
|
|
|
__bitmap_shift_left(maskp, maskp, CHUNKSZ, nmaskbits);
|
|
*maskp |= chunk;
|
|
nchunks++;
|
|
nbits += (nchunks == 1) ? nbits_to_hold_value(chunk) : CHUNKSZ;
|
|
if (nbits > nmaskbits)
|
|
return -EOVERFLOW;
|
|
} while (buflen && c == ',');
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(__bitmap_parse);
|
|
|
|
/**
|
|
* bitmap_parse_user - convert an ASCII hex string in a user buffer into a bitmap
|
|
*
|
|
* @ubuf: pointer to user buffer containing string.
|
|
* @ulen: buffer size in bytes. If string is smaller than this
|
|
* then it must be terminated with a \0.
|
|
* @maskp: pointer to bitmap array that will contain result.
|
|
* @nmaskbits: size of bitmap, in bits.
|
|
*
|
|
* Wrapper for __bitmap_parse(), providing it with user buffer.
|
|
*
|
|
* We cannot have this as an inline function in bitmap.h because it needs
|
|
* linux/uaccess.h to get the access_ok() declaration and this causes
|
|
* cyclic dependencies.
|
|
*/
|
|
int bitmap_parse_user(const char __user *ubuf,
|
|
unsigned int ulen, unsigned long *maskp,
|
|
int nmaskbits)
|
|
{
|
|
if (!access_ok(VERIFY_READ, ubuf, ulen))
|
|
return -EFAULT;
|
|
return __bitmap_parse((const char __force *)ubuf,
|
|
ulen, 1, maskp, nmaskbits);
|
|
|
|
}
|
|
EXPORT_SYMBOL(bitmap_parse_user);
|
|
|
|
/*
|
|
* bscnl_emit(buf, buflen, rbot, rtop, bp)
|
|
*
|
|
* Helper routine for bitmap_scnlistprintf(). Write decimal number
|
|
* or range to buf, suppressing output past buf+buflen, with optional
|
|
* comma-prefix. Return len of what was written to *buf, excluding the
|
|
* trailing \0.
|
|
*/
|
|
static inline int bscnl_emit(char *buf, int buflen, int rbot, int rtop, int len)
|
|
{
|
|
if (len > 0)
|
|
len += scnprintf(buf + len, buflen - len, ",");
|
|
if (rbot == rtop)
|
|
len += scnprintf(buf + len, buflen - len, "%d", rbot);
|
|
else
|
|
len += scnprintf(buf + len, buflen - len, "%d-%d", rbot, rtop);
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* bitmap_scnlistprintf - convert bitmap to list format ASCII string
|
|
* @buf: byte buffer into which string is placed
|
|
* @buflen: reserved size of @buf, in bytes
|
|
* @maskp: pointer to bitmap to convert
|
|
* @nmaskbits: size of bitmap, in bits
|
|
*
|
|
* Output format is a comma-separated list of decimal numbers and
|
|
* ranges. Consecutively set bits are shown as two hyphen-separated
|
|
* decimal numbers, the smallest and largest bit numbers set in
|
|
* the range. Output format is compatible with the format
|
|
* accepted as input by bitmap_parselist().
|
|
*
|
|
* The return value is the number of characters which were written to *buf
|
|
* excluding the trailing '\0', as per ISO C99's scnprintf.
|
|
*/
|
|
int bitmap_scnlistprintf(char *buf, unsigned int buflen,
|
|
const unsigned long *maskp, int nmaskbits)
|
|
{
|
|
int len = 0;
|
|
/* current bit is 'cur', most recently seen range is [rbot, rtop] */
|
|
int cur, rbot, rtop;
|
|
|
|
if (buflen == 0)
|
|
return 0;
|
|
buf[0] = 0;
|
|
|
|
rbot = cur = find_first_bit(maskp, nmaskbits);
|
|
while (cur < nmaskbits) {
|
|
rtop = cur;
|
|
cur = find_next_bit(maskp, nmaskbits, cur+1);
|
|
if (cur >= nmaskbits || cur > rtop + 1) {
|
|
len = bscnl_emit(buf, buflen, rbot, rtop, len);
|
|
rbot = cur;
|
|
}
|
|
}
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL(bitmap_scnlistprintf);
|
|
|
|
/**
|
|
* __bitmap_parselist - convert list format ASCII string to bitmap
|
|
* @buf: read nul-terminated user string from this buffer
|
|
* @buflen: buffer size in bytes. If string is smaller than this
|
|
* then it must be terminated with a \0.
|
|
* @is_user: location of buffer, 0 indicates kernel space
|
|
* @maskp: write resulting mask here
|
|
* @nmaskbits: number of bits in mask to be written
|
|
*
|
|
* Input format is a comma-separated list of decimal numbers and
|
|
* ranges. Consecutively set bits are shown as two hyphen-separated
|
|
* decimal numbers, the smallest and largest bit numbers set in
|
|
* the range.
|
|
*
|
|
* Returns 0 on success, -errno on invalid input strings.
|
|
* Error values:
|
|
* %-EINVAL: second number in range smaller than first
|
|
* %-EINVAL: invalid character in string
|
|
* %-ERANGE: bit number specified too large for mask
|
|
*/
|
|
static int __bitmap_parselist(const char *buf, unsigned int buflen,
|
|
int is_user, unsigned long *maskp,
|
|
int nmaskbits)
|
|
{
|
|
unsigned a, b;
|
|
int c, old_c, totaldigits;
|
|
const char __user __force *ubuf = (const char __user __force *)buf;
|
|
int exp_digit, in_range;
|
|
|
|
totaldigits = c = 0;
|
|
bitmap_zero(maskp, nmaskbits);
|
|
do {
|
|
exp_digit = 1;
|
|
in_range = 0;
|
|
a = b = 0;
|
|
|
|
/* Get the next cpu# or a range of cpu#'s */
|
|
while (buflen) {
|
|
old_c = c;
|
|
if (is_user) {
|
|
if (__get_user(c, ubuf++))
|
|
return -EFAULT;
|
|
} else
|
|
c = *buf++;
|
|
buflen--;
|
|
if (isspace(c))
|
|
continue;
|
|
|
|
/*
|
|
* If the last character was a space and the current
|
|
* character isn't '\0', we've got embedded whitespace.
|
|
* This is a no-no, so throw an error.
|
|
*/
|
|
if (totaldigits && c && isspace(old_c))
|
|
return -EINVAL;
|
|
|
|
/* A '\0' or a ',' signal the end of a cpu# or range */
|
|
if (c == '\0' || c == ',')
|
|
break;
|
|
|
|
if (c == '-') {
|
|
if (exp_digit || in_range)
|
|
return -EINVAL;
|
|
b = 0;
|
|
in_range = 1;
|
|
exp_digit = 1;
|
|
continue;
|
|
}
|
|
|
|
if (!isdigit(c))
|
|
return -EINVAL;
|
|
|
|
b = b * 10 + (c - '0');
|
|
if (!in_range)
|
|
a = b;
|
|
exp_digit = 0;
|
|
totaldigits++;
|
|
}
|
|
if (!(a <= b))
|
|
return -EINVAL;
|
|
if (b >= nmaskbits)
|
|
return -ERANGE;
|
|
while (a <= b) {
|
|
set_bit(a, maskp);
|
|
a++;
|
|
}
|
|
} while (buflen && c == ',');
|
|
return 0;
|
|
}
|
|
|
|
int bitmap_parselist(const char *bp, unsigned long *maskp, int nmaskbits)
|
|
{
|
|
char *nl = strchrnul(bp, '\n');
|
|
int len = nl - bp;
|
|
|
|
return __bitmap_parselist(bp, len, 0, maskp, nmaskbits);
|
|
}
|
|
EXPORT_SYMBOL(bitmap_parselist);
|
|
|
|
|
|
/**
|
|
* bitmap_parselist_user()
|
|
*
|
|
* @ubuf: pointer to user buffer containing string.
|
|
* @ulen: buffer size in bytes. If string is smaller than this
|
|
* then it must be terminated with a \0.
|
|
* @maskp: pointer to bitmap array that will contain result.
|
|
* @nmaskbits: size of bitmap, in bits.
|
|
*
|
|
* Wrapper for bitmap_parselist(), providing it with user buffer.
|
|
*
|
|
* We cannot have this as an inline function in bitmap.h because it needs
|
|
* linux/uaccess.h to get the access_ok() declaration and this causes
|
|
* cyclic dependencies.
|
|
*/
|
|
int bitmap_parselist_user(const char __user *ubuf,
|
|
unsigned int ulen, unsigned long *maskp,
|
|
int nmaskbits)
|
|
{
|
|
if (!access_ok(VERIFY_READ, ubuf, ulen))
|
|
return -EFAULT;
|
|
return __bitmap_parselist((const char __force *)ubuf,
|
|
ulen, 1, maskp, nmaskbits);
|
|
}
|
|
EXPORT_SYMBOL(bitmap_parselist_user);
|
|
|
|
|
|
/**
|
|
* bitmap_pos_to_ord - find ordinal of set bit at given position in bitmap
|
|
* @buf: pointer to a bitmap
|
|
* @pos: a bit position in @buf (0 <= @pos < @bits)
|
|
* @bits: number of valid bit positions in @buf
|
|
*
|
|
* Map the bit at position @pos in @buf (of length @bits) to the
|
|
* ordinal of which set bit it is. If it is not set or if @pos
|
|
* is not a valid bit position, map to -1.
|
|
*
|
|
* If for example, just bits 4 through 7 are set in @buf, then @pos
|
|
* values 4 through 7 will get mapped to 0 through 3, respectively,
|
|
* and other @pos values will get mapped to -1. When @pos value 7
|
|
* gets mapped to (returns) @ord value 3 in this example, that means
|
|
* that bit 7 is the 3rd (starting with 0th) set bit in @buf.
|
|
*
|
|
* The bit positions 0 through @bits are valid positions in @buf.
|
|
*/
|
|
static int bitmap_pos_to_ord(const unsigned long *buf, int pos, int bits)
|
|
{
|
|
int i, ord;
|
|
|
|
if (pos < 0 || pos >= bits || !test_bit(pos, buf))
|
|
return -1;
|
|
|
|
i = find_first_bit(buf, bits);
|
|
ord = 0;
|
|
while (i < pos) {
|
|
i = find_next_bit(buf, bits, i + 1);
|
|
ord++;
|
|
}
|
|
BUG_ON(i != pos);
|
|
|
|
return ord;
|
|
}
|
|
|
|
/**
|
|
* bitmap_ord_to_pos - find position of n-th set bit in bitmap
|
|
* @buf: pointer to bitmap
|
|
* @ord: ordinal bit position (n-th set bit, n >= 0)
|
|
* @bits: number of valid bit positions in @buf
|
|
*
|
|
* Map the ordinal offset of bit @ord in @buf to its position in @buf.
|
|
* Value of @ord should be in range 0 <= @ord < weight(buf), else
|
|
* results are undefined.
|
|
*
|
|
* If for example, just bits 4 through 7 are set in @buf, then @ord
|
|
* values 0 through 3 will get mapped to 4 through 7, respectively,
|
|
* and all other @ord values return undefined values. When @ord value 3
|
|
* gets mapped to (returns) @pos value 7 in this example, that means
|
|
* that the 3rd set bit (starting with 0th) is at position 7 in @buf.
|
|
*
|
|
* The bit positions 0 through @bits are valid positions in @buf.
|
|
*/
|
|
int bitmap_ord_to_pos(const unsigned long *buf, int ord, int bits)
|
|
{
|
|
int pos = 0;
|
|
|
|
if (ord >= 0 && ord < bits) {
|
|
int i;
|
|
|
|
for (i = find_first_bit(buf, bits);
|
|
i < bits && ord > 0;
|
|
i = find_next_bit(buf, bits, i + 1))
|
|
ord--;
|
|
if (i < bits && ord == 0)
|
|
pos = i;
|
|
}
|
|
|
|
return pos;
|
|
}
|
|
|
|
/**
|
|
* bitmap_remap - Apply map defined by a pair of bitmaps to another bitmap
|
|
* @dst: remapped result
|
|
* @src: subset to be remapped
|
|
* @old: defines domain of map
|
|
* @new: defines range of map
|
|
* @bits: number of bits in each of these bitmaps
|
|
*
|
|
* Let @old and @new define a mapping of bit positions, such that
|
|
* whatever position is held by the n-th set bit in @old is mapped
|
|
* to the n-th set bit in @new. In the more general case, allowing
|
|
* for the possibility that the weight 'w' of @new is less than the
|
|
* weight of @old, map the position of the n-th set bit in @old to
|
|
* the position of the m-th set bit in @new, where m == n % w.
|
|
*
|
|
* If either of the @old and @new bitmaps are empty, or if @src and
|
|
* @dst point to the same location, then this routine copies @src
|
|
* to @dst.
|
|
*
|
|
* The positions of unset bits in @old are mapped to themselves
|
|
* (the identify map).
|
|
*
|
|
* Apply the above specified mapping to @src, placing the result in
|
|
* @dst, clearing any bits previously set in @dst.
|
|
*
|
|
* For example, lets say that @old has bits 4 through 7 set, and
|
|
* @new has bits 12 through 15 set. This defines the mapping of bit
|
|
* position 4 to 12, 5 to 13, 6 to 14 and 7 to 15, and of all other
|
|
* bit positions unchanged. So if say @src comes into this routine
|
|
* with bits 1, 5 and 7 set, then @dst should leave with bits 1,
|
|
* 13 and 15 set.
|
|
*/
|
|
void bitmap_remap(unsigned long *dst, const unsigned long *src,
|
|
const unsigned long *old, const unsigned long *new,
|
|
int bits)
|
|
{
|
|
int oldbit, w;
|
|
|
|
if (dst == src) /* following doesn't handle inplace remaps */
|
|
return;
|
|
bitmap_zero(dst, bits);
|
|
|
|
w = bitmap_weight(new, bits);
|
|
for_each_set_bit(oldbit, src, bits) {
|
|
int n = bitmap_pos_to_ord(old, oldbit, bits);
|
|
|
|
if (n < 0 || w == 0)
|
|
set_bit(oldbit, dst); /* identity map */
|
|
else
|
|
set_bit(bitmap_ord_to_pos(new, n % w, bits), dst);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(bitmap_remap);
|
|
|
|
/**
|
|
* bitmap_bitremap - Apply map defined by a pair of bitmaps to a single bit
|
|
* @oldbit: bit position to be mapped
|
|
* @old: defines domain of map
|
|
* @new: defines range of map
|
|
* @bits: number of bits in each of these bitmaps
|
|
*
|
|
* Let @old and @new define a mapping of bit positions, such that
|
|
* whatever position is held by the n-th set bit in @old is mapped
|
|
* to the n-th set bit in @new. In the more general case, allowing
|
|
* for the possibility that the weight 'w' of @new is less than the
|
|
* weight of @old, map the position of the n-th set bit in @old to
|
|
* the position of the m-th set bit in @new, where m == n % w.
|
|
*
|
|
* The positions of unset bits in @old are mapped to themselves
|
|
* (the identify map).
|
|
*
|
|
* Apply the above specified mapping to bit position @oldbit, returning
|
|
* the new bit position.
|
|
*
|
|
* For example, lets say that @old has bits 4 through 7 set, and
|
|
* @new has bits 12 through 15 set. This defines the mapping of bit
|
|
* position 4 to 12, 5 to 13, 6 to 14 and 7 to 15, and of all other
|
|
* bit positions unchanged. So if say @oldbit is 5, then this routine
|
|
* returns 13.
|
|
*/
|
|
int bitmap_bitremap(int oldbit, const unsigned long *old,
|
|
const unsigned long *new, int bits)
|
|
{
|
|
int w = bitmap_weight(new, bits);
|
|
int n = bitmap_pos_to_ord(old, oldbit, bits);
|
|
if (n < 0 || w == 0)
|
|
return oldbit;
|
|
else
|
|
return bitmap_ord_to_pos(new, n % w, bits);
|
|
}
|
|
EXPORT_SYMBOL(bitmap_bitremap);
|
|
|
|
/**
|
|
* bitmap_onto - translate one bitmap relative to another
|
|
* @dst: resulting translated bitmap
|
|
* @orig: original untranslated bitmap
|
|
* @relmap: bitmap relative to which translated
|
|
* @bits: number of bits in each of these bitmaps
|
|
*
|
|
* Set the n-th bit of @dst iff there exists some m such that the
|
|
* n-th bit of @relmap is set, the m-th bit of @orig is set, and
|
|
* the n-th bit of @relmap is also the m-th _set_ bit of @relmap.
|
|
* (If you understood the previous sentence the first time your
|
|
* read it, you're overqualified for your current job.)
|
|
*
|
|
* In other words, @orig is mapped onto (surjectively) @dst,
|
|
* using the map { <n, m> | the n-th bit of @relmap is the
|
|
* m-th set bit of @relmap }.
|
|
*
|
|
* Any set bits in @orig above bit number W, where W is the
|
|
* weight of (number of set bits in) @relmap are mapped nowhere.
|
|
* In particular, if for all bits m set in @orig, m >= W, then
|
|
* @dst will end up empty. In situations where the possibility
|
|
* of such an empty result is not desired, one way to avoid it is
|
|
* to use the bitmap_fold() operator, below, to first fold the
|
|
* @orig bitmap over itself so that all its set bits x are in the
|
|
* range 0 <= x < W. The bitmap_fold() operator does this by
|
|
* setting the bit (m % W) in @dst, for each bit (m) set in @orig.
|
|
*
|
|
* Example [1] for bitmap_onto():
|
|
* Let's say @relmap has bits 30-39 set, and @orig has bits
|
|
* 1, 3, 5, 7, 9 and 11 set. Then on return from this routine,
|
|
* @dst will have bits 31, 33, 35, 37 and 39 set.
|
|
*
|
|
* When bit 0 is set in @orig, it means turn on the bit in
|
|
* @dst corresponding to whatever is the first bit (if any)
|
|
* that is turned on in @relmap. Since bit 0 was off in the
|
|
* above example, we leave off that bit (bit 30) in @dst.
|
|
*
|
|
* When bit 1 is set in @orig (as in the above example), it
|
|
* means turn on the bit in @dst corresponding to whatever
|
|
* is the second bit that is turned on in @relmap. The second
|
|
* bit in @relmap that was turned on in the above example was
|
|
* bit 31, so we turned on bit 31 in @dst.
|
|
*
|
|
* Similarly, we turned on bits 33, 35, 37 and 39 in @dst,
|
|
* because they were the 4th, 6th, 8th and 10th set bits
|
|
* set in @relmap, and the 4th, 6th, 8th and 10th bits of
|
|
* @orig (i.e. bits 3, 5, 7 and 9) were also set.
|
|
*
|
|
* When bit 11 is set in @orig, it means turn on the bit in
|
|
* @dst corresponding to whatever is the twelfth bit that is
|
|
* turned on in @relmap. In the above example, there were
|
|
* only ten bits turned on in @relmap (30..39), so that bit
|
|
* 11 was set in @orig had no affect on @dst.
|
|
*
|
|
* Example [2] for bitmap_fold() + bitmap_onto():
|
|
* Let's say @relmap has these ten bits set:
|
|
* 40 41 42 43 45 48 53 61 74 95
|
|
* (for the curious, that's 40 plus the first ten terms of the
|
|
* Fibonacci sequence.)
|
|
*
|
|
* Further lets say we use the following code, invoking
|
|
* bitmap_fold() then bitmap_onto, as suggested above to
|
|
* avoid the possibility of an empty @dst result:
|
|
*
|
|
* unsigned long *tmp; // a temporary bitmap's bits
|
|
*
|
|
* bitmap_fold(tmp, orig, bitmap_weight(relmap, bits), bits);
|
|
* bitmap_onto(dst, tmp, relmap, bits);
|
|
*
|
|
* Then this table shows what various values of @dst would be, for
|
|
* various @orig's. I list the zero-based positions of each set bit.
|
|
* The tmp column shows the intermediate result, as computed by
|
|
* using bitmap_fold() to fold the @orig bitmap modulo ten
|
|
* (the weight of @relmap).
|
|
*
|
|
* @orig tmp @dst
|
|
* 0 0 40
|
|
* 1 1 41
|
|
* 9 9 95
|
|
* 10 0 40 (*)
|
|
* 1 3 5 7 1 3 5 7 41 43 48 61
|
|
* 0 1 2 3 4 0 1 2 3 4 40 41 42 43 45
|
|
* 0 9 18 27 0 9 8 7 40 61 74 95
|
|
* 0 10 20 30 0 40
|
|
* 0 11 22 33 0 1 2 3 40 41 42 43
|
|
* 0 12 24 36 0 2 4 6 40 42 45 53
|
|
* 78 102 211 1 2 8 41 42 74 (*)
|
|
*
|
|
* (*) For these marked lines, if we hadn't first done bitmap_fold()
|
|
* into tmp, then the @dst result would have been empty.
|
|
*
|
|
* If either of @orig or @relmap is empty (no set bits), then @dst
|
|
* will be returned empty.
|
|
*
|
|
* If (as explained above) the only set bits in @orig are in positions
|
|
* m where m >= W, (where W is the weight of @relmap) then @dst will
|
|
* once again be returned empty.
|
|
*
|
|
* All bits in @dst not set by the above rule are cleared.
|
|
*/
|
|
void bitmap_onto(unsigned long *dst, const unsigned long *orig,
|
|
const unsigned long *relmap, int bits)
|
|
{
|
|
int n, m; /* same meaning as in above comment */
|
|
|
|
if (dst == orig) /* following doesn't handle inplace mappings */
|
|
return;
|
|
bitmap_zero(dst, bits);
|
|
|
|
/*
|
|
* The following code is a more efficient, but less
|
|
* obvious, equivalent to the loop:
|
|
* for (m = 0; m < bitmap_weight(relmap, bits); m++) {
|
|
* n = bitmap_ord_to_pos(orig, m, bits);
|
|
* if (test_bit(m, orig))
|
|
* set_bit(n, dst);
|
|
* }
|
|
*/
|
|
|
|
m = 0;
|
|
for_each_set_bit(n, relmap, bits) {
|
|
/* m == bitmap_pos_to_ord(relmap, n, bits) */
|
|
if (test_bit(m, orig))
|
|
set_bit(n, dst);
|
|
m++;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(bitmap_onto);
|
|
|
|
/**
|
|
* bitmap_fold - fold larger bitmap into smaller, modulo specified size
|
|
* @dst: resulting smaller bitmap
|
|
* @orig: original larger bitmap
|
|
* @sz: specified size
|
|
* @bits: number of bits in each of these bitmaps
|
|
*
|
|
* For each bit oldbit in @orig, set bit oldbit mod @sz in @dst.
|
|
* Clear all other bits in @dst. See further the comment and
|
|
* Example [2] for bitmap_onto() for why and how to use this.
|
|
*/
|
|
void bitmap_fold(unsigned long *dst, const unsigned long *orig,
|
|
int sz, int bits)
|
|
{
|
|
int oldbit;
|
|
|
|
if (dst == orig) /* following doesn't handle inplace mappings */
|
|
return;
|
|
bitmap_zero(dst, bits);
|
|
|
|
for_each_set_bit(oldbit, orig, bits)
|
|
set_bit(oldbit % sz, dst);
|
|
}
|
|
EXPORT_SYMBOL(bitmap_fold);
|
|
|
|
/*
|
|
* Common code for bitmap_*_region() routines.
|
|
* bitmap: array of unsigned longs corresponding to the bitmap
|
|
* pos: the beginning of the region
|
|
* order: region size (log base 2 of number of bits)
|
|
* reg_op: operation(s) to perform on that region of bitmap
|
|
*
|
|
* Can set, verify and/or release a region of bits in a bitmap,
|
|
* depending on which combination of REG_OP_* flag bits is set.
|
|
*
|
|
* A region of a bitmap is a sequence of bits in the bitmap, of
|
|
* some size '1 << order' (a power of two), aligned to that same
|
|
* '1 << order' power of two.
|
|
*
|
|
* Returns 1 if REG_OP_ISFREE succeeds (region is all zero bits).
|
|
* Returns 0 in all other cases and reg_ops.
|
|
*/
|
|
|
|
enum {
|
|
REG_OP_ISFREE, /* true if region is all zero bits */
|
|
REG_OP_ALLOC, /* set all bits in region */
|
|
REG_OP_RELEASE, /* clear all bits in region */
|
|
};
|
|
|
|
static int __reg_op(unsigned long *bitmap, unsigned int pos, int order, int reg_op)
|
|
{
|
|
int nbits_reg; /* number of bits in region */
|
|
int index; /* index first long of region in bitmap */
|
|
int offset; /* bit offset region in bitmap[index] */
|
|
int nlongs_reg; /* num longs spanned by region in bitmap */
|
|
int nbitsinlong; /* num bits of region in each spanned long */
|
|
unsigned long mask; /* bitmask for one long of region */
|
|
int i; /* scans bitmap by longs */
|
|
int ret = 0; /* return value */
|
|
|
|
/*
|
|
* Either nlongs_reg == 1 (for small orders that fit in one long)
|
|
* or (offset == 0 && mask == ~0UL) (for larger multiword orders.)
|
|
*/
|
|
nbits_reg = 1 << order;
|
|
index = pos / BITS_PER_LONG;
|
|
offset = pos - (index * BITS_PER_LONG);
|
|
nlongs_reg = BITS_TO_LONGS(nbits_reg);
|
|
nbitsinlong = min(nbits_reg, BITS_PER_LONG);
|
|
|
|
/*
|
|
* Can't do "mask = (1UL << nbitsinlong) - 1", as that
|
|
* overflows if nbitsinlong == BITS_PER_LONG.
|
|
*/
|
|
mask = (1UL << (nbitsinlong - 1));
|
|
mask += mask - 1;
|
|
mask <<= offset;
|
|
|
|
switch (reg_op) {
|
|
case REG_OP_ISFREE:
|
|
for (i = 0; i < nlongs_reg; i++) {
|
|
if (bitmap[index + i] & mask)
|
|
goto done;
|
|
}
|
|
ret = 1; /* all bits in region free (zero) */
|
|
break;
|
|
|
|
case REG_OP_ALLOC:
|
|
for (i = 0; i < nlongs_reg; i++)
|
|
bitmap[index + i] |= mask;
|
|
break;
|
|
|
|
case REG_OP_RELEASE:
|
|
for (i = 0; i < nlongs_reg; i++)
|
|
bitmap[index + i] &= ~mask;
|
|
break;
|
|
}
|
|
done:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* bitmap_find_free_region - find a contiguous aligned mem region
|
|
* @bitmap: array of unsigned longs corresponding to the bitmap
|
|
* @bits: number of bits in the bitmap
|
|
* @order: region size (log base 2 of number of bits) to find
|
|
*
|
|
* Find a region of free (zero) bits in a @bitmap of @bits bits and
|
|
* allocate them (set them to one). Only consider regions of length
|
|
* a power (@order) of two, aligned to that power of two, which
|
|
* makes the search algorithm much faster.
|
|
*
|
|
* Return the bit offset in bitmap of the allocated region,
|
|
* or -errno on failure.
|
|
*/
|
|
int bitmap_find_free_region(unsigned long *bitmap, unsigned int bits, int order)
|
|
{
|
|
unsigned int pos, end; /* scans bitmap by regions of size order */
|
|
|
|
for (pos = 0 ; (end = pos + (1U << order)) <= bits; pos = end) {
|
|
if (!__reg_op(bitmap, pos, order, REG_OP_ISFREE))
|
|
continue;
|
|
__reg_op(bitmap, pos, order, REG_OP_ALLOC);
|
|
return pos;
|
|
}
|
|
return -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL(bitmap_find_free_region);
|
|
|
|
/**
|
|
* bitmap_release_region - release allocated bitmap region
|
|
* @bitmap: array of unsigned longs corresponding to the bitmap
|
|
* @pos: beginning of bit region to release
|
|
* @order: region size (log base 2 of number of bits) to release
|
|
*
|
|
* This is the complement to __bitmap_find_free_region() and releases
|
|
* the found region (by clearing it in the bitmap).
|
|
*
|
|
* No return value.
|
|
*/
|
|
void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order)
|
|
{
|
|
__reg_op(bitmap, pos, order, REG_OP_RELEASE);
|
|
}
|
|
EXPORT_SYMBOL(bitmap_release_region);
|
|
|
|
/**
|
|
* bitmap_allocate_region - allocate bitmap region
|
|
* @bitmap: array of unsigned longs corresponding to the bitmap
|
|
* @pos: beginning of bit region to allocate
|
|
* @order: region size (log base 2 of number of bits) to allocate
|
|
*
|
|
* Allocate (set bits in) a specified region of a bitmap.
|
|
*
|
|
* Return 0 on success, or %-EBUSY if specified region wasn't
|
|
* free (not all bits were zero).
|
|
*/
|
|
int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order)
|
|
{
|
|
if (!__reg_op(bitmap, pos, order, REG_OP_ISFREE))
|
|
return -EBUSY;
|
|
return __reg_op(bitmap, pos, order, REG_OP_ALLOC);
|
|
}
|
|
EXPORT_SYMBOL(bitmap_allocate_region);
|
|
|
|
/**
|
|
* bitmap_copy_le - copy a bitmap, putting the bits into little-endian order.
|
|
* @dst: destination buffer
|
|
* @src: bitmap to copy
|
|
* @nbits: number of bits in the bitmap
|
|
*
|
|
* Require nbits % BITS_PER_LONG == 0.
|
|
*/
|
|
void bitmap_copy_le(void *dst, const unsigned long *src, int nbits)
|
|
{
|
|
unsigned long *d = dst;
|
|
int i;
|
|
|
|
for (i = 0; i < nbits/BITS_PER_LONG; i++) {
|
|
if (BITS_PER_LONG == 64)
|
|
d[i] = cpu_to_le64(src[i]);
|
|
else
|
|
d[i] = cpu_to_le32(src[i]);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(bitmap_copy_le);
|