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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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4f07118f65
It appears that a memory barrier soon after a mispredicted branch, not just in the delay slot, can cause the hang condition of this cpu errata. So move them out-of-line, and explicitly put them into a "branch always, predict taken" delay slot which should fully kill this problem. Signed-off-by: David S. Miller <davem@davemloft.net>
295 lines
7.6 KiB
C
295 lines
7.6 KiB
C
/* $Id: bitops.h,v 1.39 2002/01/30 01:40:00 davem Exp $
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* bitops.h: Bit string operations on the V9.
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*
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* Copyright 1996, 1997 David S. Miller (davem@caip.rutgers.edu)
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*/
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#ifndef _SPARC64_BITOPS_H
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#define _SPARC64_BITOPS_H
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#include <linux/config.h>
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#include <linux/compiler.h>
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#include <asm/byteorder.h>
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extern int test_and_set_bit(unsigned long nr, volatile unsigned long *addr);
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extern int test_and_clear_bit(unsigned long nr, volatile unsigned long *addr);
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extern int test_and_change_bit(unsigned long nr, volatile unsigned long *addr);
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extern void set_bit(unsigned long nr, volatile unsigned long *addr);
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extern void clear_bit(unsigned long nr, volatile unsigned long *addr);
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extern void change_bit(unsigned long nr, volatile unsigned long *addr);
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/* "non-atomic" versions... */
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static inline void __set_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long *m = ((unsigned long *)addr) + (nr >> 6);
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*m |= (1UL << (nr & 63));
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}
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static inline void __clear_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long *m = ((unsigned long *)addr) + (nr >> 6);
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*m &= ~(1UL << (nr & 63));
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}
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static inline void __change_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long *m = ((unsigned long *)addr) + (nr >> 6);
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*m ^= (1UL << (nr & 63));
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}
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static inline int __test_and_set_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long *m = ((unsigned long *)addr) + (nr >> 6);
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unsigned long old = *m;
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unsigned long mask = (1UL << (nr & 63));
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*m = (old | mask);
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return ((old & mask) != 0);
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}
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static inline int __test_and_clear_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long *m = ((unsigned long *)addr) + (nr >> 6);
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unsigned long old = *m;
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unsigned long mask = (1UL << (nr & 63));
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*m = (old & ~mask);
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return ((old & mask) != 0);
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}
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static inline int __test_and_change_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long *m = ((unsigned long *)addr) + (nr >> 6);
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unsigned long old = *m;
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unsigned long mask = (1UL << (nr & 63));
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*m = (old ^ mask);
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return ((old & mask) != 0);
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}
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#ifdef CONFIG_SMP
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#define smp_mb__before_clear_bit() membar_storeload_loadload()
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#define smp_mb__after_clear_bit() membar_storeload_storestore()
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#else
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#define smp_mb__before_clear_bit() barrier()
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#define smp_mb__after_clear_bit() barrier()
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#endif
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static inline int test_bit(int nr, __const__ volatile unsigned long *addr)
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{
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return (1UL & (addr[nr >> 6] >> (nr & 63))) != 0UL;
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}
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/* The easy/cheese version for now. */
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static inline unsigned long ffz(unsigned long word)
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{
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unsigned long result;
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result = 0;
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while(word & 1) {
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result++;
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word >>= 1;
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}
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return result;
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}
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/**
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* __ffs - find first bit in word.
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* @word: The word to search
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*
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* Undefined if no bit exists, so code should check against 0 first.
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*/
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static inline unsigned long __ffs(unsigned long word)
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{
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unsigned long result = 0;
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while (!(word & 1UL)) {
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result++;
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word >>= 1;
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}
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return result;
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}
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/*
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* fls: find last bit set.
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*/
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#define fls(x) generic_fls(x)
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#ifdef __KERNEL__
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/*
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* Every architecture must define this function. It's the fastest
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* way of searching a 140-bit bitmap where the first 100 bits are
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* unlikely to be set. It's guaranteed that at least one of the 140
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* bits is cleared.
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*/
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static inline int sched_find_first_bit(unsigned long *b)
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{
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if (unlikely(b[0]))
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return __ffs(b[0]);
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if (unlikely(((unsigned int)b[1])))
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return __ffs(b[1]) + 64;
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if (b[1] >> 32)
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return __ffs(b[1] >> 32) + 96;
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return __ffs(b[2]) + 128;
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}
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/*
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* ffs: find first bit set. This is defined the same way as
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* the libc and compiler builtin ffs routines, therefore
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* differs in spirit from the above ffz (man ffs).
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*/
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static inline int ffs(int x)
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{
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if (!x)
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return 0;
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return __ffs((unsigned long)x) + 1;
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}
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/*
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* hweightN: returns the hamming weight (i.e. the number
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* of bits set) of a N-bit word
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*/
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#ifdef ULTRA_HAS_POPULATION_COUNT
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static inline unsigned int hweight64(unsigned long w)
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{
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unsigned int res;
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__asm__ ("popc %1,%0" : "=r" (res) : "r" (w));
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return res;
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}
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static inline unsigned int hweight32(unsigned int w)
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{
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unsigned int res;
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__asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xffffffff));
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return res;
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}
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static inline unsigned int hweight16(unsigned int w)
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{
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unsigned int res;
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__asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xffff));
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return res;
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}
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static inline unsigned int hweight8(unsigned int w)
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{
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unsigned int res;
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__asm__ ("popc %1,%0" : "=r" (res) : "r" (w & 0xff));
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return res;
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}
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#else
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#define hweight64(x) generic_hweight64(x)
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#define hweight32(x) generic_hweight32(x)
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#define hweight16(x) generic_hweight16(x)
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#define hweight8(x) generic_hweight8(x)
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#endif
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#endif /* __KERNEL__ */
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/**
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* find_next_bit - find the next set bit in a memory region
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* @addr: The address to base the search on
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* @offset: The bitnumber to start searching at
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* @size: The maximum size to search
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*/
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extern unsigned long find_next_bit(const unsigned long *, unsigned long,
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unsigned long);
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/**
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* find_first_bit - find the first set bit in a memory region
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* @addr: The address to start the search at
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* @size: The maximum size to search
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*
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* Returns the bit-number of the first set bit, not the number of the byte
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* containing a bit.
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*/
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#define find_first_bit(addr, size) \
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find_next_bit((addr), (size), 0)
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/* find_next_zero_bit() finds the first zero bit in a bit string of length
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* 'size' bits, starting the search at bit 'offset'. This is largely based
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* on Linus's ALPHA routines, which are pretty portable BTW.
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*/
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extern unsigned long find_next_zero_bit(const unsigned long *,
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unsigned long, unsigned long);
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#define find_first_zero_bit(addr, size) \
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find_next_zero_bit((addr), (size), 0)
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#define test_and_set_le_bit(nr,addr) \
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test_and_set_bit((nr) ^ 0x38, (addr))
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#define test_and_clear_le_bit(nr,addr) \
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test_and_clear_bit((nr) ^ 0x38, (addr))
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static inline int test_le_bit(int nr, __const__ unsigned long * addr)
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{
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int mask;
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__const__ unsigned char *ADDR = (__const__ unsigned char *) addr;
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ADDR += nr >> 3;
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mask = 1 << (nr & 0x07);
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return ((mask & *ADDR) != 0);
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}
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#define find_first_zero_le_bit(addr, size) \
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find_next_zero_le_bit((addr), (size), 0)
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extern unsigned long find_next_zero_le_bit(unsigned long *, unsigned long, unsigned long);
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#ifdef __KERNEL__
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#define __set_le_bit(nr, addr) \
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__set_bit((nr) ^ 0x38, (addr))
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#define __clear_le_bit(nr, addr) \
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__clear_bit((nr) ^ 0x38, (addr))
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#define __test_and_clear_le_bit(nr, addr) \
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__test_and_clear_bit((nr) ^ 0x38, (addr))
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#define __test_and_set_le_bit(nr, addr) \
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__test_and_set_bit((nr) ^ 0x38, (addr))
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#define ext2_set_bit(nr,addr) \
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__test_and_set_le_bit((nr),(unsigned long *)(addr))
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#define ext2_set_bit_atomic(lock,nr,addr) \
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test_and_set_le_bit((nr),(unsigned long *)(addr))
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#define ext2_clear_bit(nr,addr) \
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__test_and_clear_le_bit((nr),(unsigned long *)(addr))
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#define ext2_clear_bit_atomic(lock,nr,addr) \
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test_and_clear_le_bit((nr),(unsigned long *)(addr))
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#define ext2_test_bit(nr,addr) \
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test_le_bit((nr),(unsigned long *)(addr))
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#define ext2_find_first_zero_bit(addr, size) \
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find_first_zero_le_bit((unsigned long *)(addr), (size))
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#define ext2_find_next_zero_bit(addr, size, off) \
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find_next_zero_le_bit((unsigned long *)(addr), (size), (off))
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/* Bitmap functions for the minix filesystem. */
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#define minix_test_and_set_bit(nr,addr) \
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test_and_set_bit((nr),(unsigned long *)(addr))
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#define minix_set_bit(nr,addr) \
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set_bit((nr),(unsigned long *)(addr))
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#define minix_test_and_clear_bit(nr,addr) \
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test_and_clear_bit((nr),(unsigned long *)(addr))
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#define minix_test_bit(nr,addr) \
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test_bit((nr),(unsigned long *)(addr))
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#define minix_find_first_zero_bit(addr,size) \
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find_first_zero_bit((unsigned long *)(addr),(size))
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#endif /* __KERNEL__ */
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#endif /* defined(_SPARC64_BITOPS_H) */
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