mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 09:40:53 +07:00
01a3ee2b20
lib/bitmap.c:bitmap_parse() is a library function that received as input a user buffer. This seemed to have originated from the way the write_proc function of the /proc filesystem operates. This has been reworked to not use kmalloc and eliminates a lot of get_user() overhead by performing one access_ok before using __get_user(). We need to test if we are in kernel or user space (is_user) and access the buffer differently. We cannot use __get_user() to access kernel addresses in all cases, for example in architectures with separate address space for kernel and user. This function will be useful for other uses as well; for example, taking input for /sysfs instead of /proc, so it was changed to accept kernel buffers. We have this use for the Linux UWB project, as part as the upcoming bandwidth allocator code. Only a few routines used this function and they were changed too. Signed-off-by: Reinette Chatre <reinette.chatre@linux.intel.com> Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Cc: Paul Jackson <pj@sgi.com> Cc: Joe Korty <joe.korty@ccur.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
285 lines
9.5 KiB
C
285 lines
9.5 KiB
C
#ifndef __LINUX_BITMAP_H
|
|
#define __LINUX_BITMAP_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/string.h>
|
|
|
|
/*
|
|
* bitmaps provide bit arrays that consume one or more unsigned
|
|
* longs. The bitmap interface and available operations are listed
|
|
* here, in bitmap.h
|
|
*
|
|
* Function implementations generic to all architectures are in
|
|
* lib/bitmap.c. Functions implementations that are architecture
|
|
* specific are in various include/asm-<arch>/bitops.h headers
|
|
* and other arch/<arch> specific files.
|
|
*
|
|
* See lib/bitmap.c for more details.
|
|
*/
|
|
|
|
/*
|
|
* The available bitmap operations and their rough meaning in the
|
|
* case that the bitmap is a single unsigned long are thus:
|
|
*
|
|
* Note that nbits should be always a compile time evaluable constant.
|
|
* Otherwise many inlines will generate horrible code.
|
|
*
|
|
* bitmap_zero(dst, nbits) *dst = 0UL
|
|
* bitmap_fill(dst, nbits) *dst = ~0UL
|
|
* bitmap_copy(dst, src, nbits) *dst = *src
|
|
* bitmap_and(dst, src1, src2, nbits) *dst = *src1 & *src2
|
|
* bitmap_or(dst, src1, src2, nbits) *dst = *src1 | *src2
|
|
* bitmap_xor(dst, src1, src2, nbits) *dst = *src1 ^ *src2
|
|
* bitmap_andnot(dst, src1, src2, nbits) *dst = *src1 & ~(*src2)
|
|
* bitmap_complement(dst, src, nbits) *dst = ~(*src)
|
|
* bitmap_equal(src1, src2, nbits) Are *src1 and *src2 equal?
|
|
* bitmap_intersects(src1, src2, nbits) Do *src1 and *src2 overlap?
|
|
* bitmap_subset(src1, src2, nbits) Is *src1 a subset of *src2?
|
|
* bitmap_empty(src, nbits) Are all bits zero in *src?
|
|
* bitmap_full(src, nbits) Are all bits set in *src?
|
|
* bitmap_weight(src, nbits) Hamming Weight: number set bits
|
|
* bitmap_shift_right(dst, src, n, nbits) *dst = *src >> n
|
|
* bitmap_shift_left(dst, src, n, nbits) *dst = *src << n
|
|
* bitmap_remap(dst, src, old, new, nbits) *dst = map(old, new)(src)
|
|
* bitmap_bitremap(oldbit, old, new, nbits) newbit = map(old, new)(oldbit)
|
|
* bitmap_scnprintf(buf, len, src, nbits) Print bitmap src to buf
|
|
* bitmap_parse(buf, buflen, dst, nbits) Parse bitmap dst from kernel buf
|
|
* bitmap_parse_user(ubuf, ulen, dst, nbits) Parse bitmap dst from user buf
|
|
* bitmap_scnlistprintf(buf, len, src, nbits) Print bitmap src as list to buf
|
|
* bitmap_parselist(buf, dst, nbits) Parse bitmap dst from list
|
|
* bitmap_find_free_region(bitmap, bits, order) Find and allocate bit region
|
|
* bitmap_release_region(bitmap, pos, order) Free specified bit region
|
|
* bitmap_allocate_region(bitmap, pos, order) Allocate specified bit region
|
|
*/
|
|
|
|
/*
|
|
* Also the following operations in asm/bitops.h apply to bitmaps.
|
|
*
|
|
* set_bit(bit, addr) *addr |= bit
|
|
* clear_bit(bit, addr) *addr &= ~bit
|
|
* change_bit(bit, addr) *addr ^= bit
|
|
* test_bit(bit, addr) Is bit set in *addr?
|
|
* test_and_set_bit(bit, addr) Set bit and return old value
|
|
* test_and_clear_bit(bit, addr) Clear bit and return old value
|
|
* test_and_change_bit(bit, addr) Change bit and return old value
|
|
* find_first_zero_bit(addr, nbits) Position first zero bit in *addr
|
|
* find_first_bit(addr, nbits) Position first set bit in *addr
|
|
* find_next_zero_bit(addr, nbits, bit) Position next zero bit in *addr >= bit
|
|
* find_next_bit(addr, nbits, bit) Position next set bit in *addr >= bit
|
|
*/
|
|
|
|
/*
|
|
* The DECLARE_BITMAP(name,bits) macro, in linux/types.h, can be used
|
|
* to declare an array named 'name' of just enough unsigned longs to
|
|
* contain all bit positions from 0 to 'bits' - 1.
|
|
*/
|
|
|
|
/*
|
|
* lib/bitmap.c provides these functions:
|
|
*/
|
|
|
|
extern int __bitmap_empty(const unsigned long *bitmap, int bits);
|
|
extern int __bitmap_full(const unsigned long *bitmap, int bits);
|
|
extern int __bitmap_equal(const unsigned long *bitmap1,
|
|
const unsigned long *bitmap2, int bits);
|
|
extern void __bitmap_complement(unsigned long *dst, const unsigned long *src,
|
|
int bits);
|
|
extern void __bitmap_shift_right(unsigned long *dst,
|
|
const unsigned long *src, int shift, int bits);
|
|
extern void __bitmap_shift_left(unsigned long *dst,
|
|
const unsigned long *src, int shift, int bits);
|
|
extern void __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
|
|
const unsigned long *bitmap2, int bits);
|
|
extern void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
|
|
const unsigned long *bitmap2, int bits);
|
|
extern void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1,
|
|
const unsigned long *bitmap2, int bits);
|
|
extern void __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
|
|
const unsigned long *bitmap2, int bits);
|
|
extern int __bitmap_intersects(const unsigned long *bitmap1,
|
|
const unsigned long *bitmap2, int bits);
|
|
extern int __bitmap_subset(const unsigned long *bitmap1,
|
|
const unsigned long *bitmap2, int bits);
|
|
extern int __bitmap_weight(const unsigned long *bitmap, int bits);
|
|
|
|
extern int bitmap_scnprintf(char *buf, unsigned int len,
|
|
const unsigned long *src, int nbits);
|
|
extern int __bitmap_parse(const char *buf, unsigned int buflen, int is_user,
|
|
unsigned long *dst, int nbits);
|
|
extern int bitmap_parse_user(const char __user *ubuf, unsigned int ulen,
|
|
unsigned long *dst, int nbits);
|
|
extern int bitmap_scnlistprintf(char *buf, unsigned int len,
|
|
const unsigned long *src, int nbits);
|
|
extern int bitmap_parselist(const char *buf, unsigned long *maskp,
|
|
int nmaskbits);
|
|
extern void bitmap_remap(unsigned long *dst, const unsigned long *src,
|
|
const unsigned long *old, const unsigned long *new, int bits);
|
|
extern int bitmap_bitremap(int oldbit,
|
|
const unsigned long *old, const unsigned long *new, int bits);
|
|
extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order);
|
|
extern void bitmap_release_region(unsigned long *bitmap, int pos, int order);
|
|
extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order);
|
|
|
|
#define BITMAP_LAST_WORD_MASK(nbits) \
|
|
( \
|
|
((nbits) % BITS_PER_LONG) ? \
|
|
(1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \
|
|
)
|
|
|
|
static inline void bitmap_zero(unsigned long *dst, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
*dst = 0UL;
|
|
else {
|
|
int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
|
|
memset(dst, 0, len);
|
|
}
|
|
}
|
|
|
|
static inline void bitmap_fill(unsigned long *dst, int nbits)
|
|
{
|
|
size_t nlongs = BITS_TO_LONGS(nbits);
|
|
if (nlongs > 1) {
|
|
int len = (nlongs - 1) * sizeof(unsigned long);
|
|
memset(dst, 0xff, len);
|
|
}
|
|
dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
|
|
}
|
|
|
|
static inline void bitmap_copy(unsigned long *dst, const unsigned long *src,
|
|
int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
*dst = *src;
|
|
else {
|
|
int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
|
|
memcpy(dst, src, len);
|
|
}
|
|
}
|
|
|
|
static inline void bitmap_and(unsigned long *dst, const unsigned long *src1,
|
|
const unsigned long *src2, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
*dst = *src1 & *src2;
|
|
else
|
|
__bitmap_and(dst, src1, src2, nbits);
|
|
}
|
|
|
|
static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
|
|
const unsigned long *src2, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
*dst = *src1 | *src2;
|
|
else
|
|
__bitmap_or(dst, src1, src2, nbits);
|
|
}
|
|
|
|
static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1,
|
|
const unsigned long *src2, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
*dst = *src1 ^ *src2;
|
|
else
|
|
__bitmap_xor(dst, src1, src2, nbits);
|
|
}
|
|
|
|
static inline void bitmap_andnot(unsigned long *dst, const unsigned long *src1,
|
|
const unsigned long *src2, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
*dst = *src1 & ~(*src2);
|
|
else
|
|
__bitmap_andnot(dst, src1, src2, nbits);
|
|
}
|
|
|
|
static inline void bitmap_complement(unsigned long *dst, const unsigned long *src,
|
|
int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
*dst = ~(*src) & BITMAP_LAST_WORD_MASK(nbits);
|
|
else
|
|
__bitmap_complement(dst, src, nbits);
|
|
}
|
|
|
|
static inline int bitmap_equal(const unsigned long *src1,
|
|
const unsigned long *src2, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
return ! ((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits));
|
|
else
|
|
return __bitmap_equal(src1, src2, nbits);
|
|
}
|
|
|
|
static inline int bitmap_intersects(const unsigned long *src1,
|
|
const unsigned long *src2, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0;
|
|
else
|
|
return __bitmap_intersects(src1, src2, nbits);
|
|
}
|
|
|
|
static inline int bitmap_subset(const unsigned long *src1,
|
|
const unsigned long *src2, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
return ! ((*src1 & ~(*src2)) & BITMAP_LAST_WORD_MASK(nbits));
|
|
else
|
|
return __bitmap_subset(src1, src2, nbits);
|
|
}
|
|
|
|
static inline int bitmap_empty(const unsigned long *src, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
|
|
else
|
|
return __bitmap_empty(src, nbits);
|
|
}
|
|
|
|
static inline int bitmap_full(const unsigned long *src, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
|
|
else
|
|
return __bitmap_full(src, nbits);
|
|
}
|
|
|
|
static inline int bitmap_weight(const unsigned long *src, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
|
|
return __bitmap_weight(src, nbits);
|
|
}
|
|
|
|
static inline void bitmap_shift_right(unsigned long *dst,
|
|
const unsigned long *src, int n, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
*dst = *src >> n;
|
|
else
|
|
__bitmap_shift_right(dst, src, n, nbits);
|
|
}
|
|
|
|
static inline void bitmap_shift_left(unsigned long *dst,
|
|
const unsigned long *src, int n, int nbits)
|
|
{
|
|
if (nbits <= BITS_PER_LONG)
|
|
*dst = (*src << n) & BITMAP_LAST_WORD_MASK(nbits);
|
|
else
|
|
__bitmap_shift_left(dst, src, n, nbits);
|
|
}
|
|
|
|
static inline int bitmap_parse(const char *buf, unsigned int buflen,
|
|
unsigned long *maskp, int nmaskbits)
|
|
{
|
|
return __bitmap_parse(buf, buflen, 0, maskp, nmaskbits);
|
|
}
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif /* __LINUX_BITMAP_H */
|