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TOMOYO Linux Cross Reference
Linux/include/linux/prefetch.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  *  Generic cache management functions. Everything is arch-specific,  
  4  *  but this header exists to make sure the defines/functions can be
  5  *  used in a generic way.
  6  *
  7  *  2000-11-13  Arjan van de Ven   <arjan@fenrus.demon.nl>
  8  *
  9  */
 10 
 11 #ifndef _LINUX_PREFETCH_H
 12 #define _LINUX_PREFETCH_H
 13 
 14 #include <linux/types.h>
 15 #include <asm/processor.h>
 16 #include <asm/cache.h>
 17 
 18 struct page;
 19 /*
 20         prefetch(x) attempts to pre-emptively get the memory pointed to
 21         by address "x" into the CPU L1 cache. 
 22         prefetch(x) should not cause any kind of exception, prefetch(0) is
 23         specifically ok.
 24 
 25         prefetch() should be defined by the architecture, if not, the 
 26         #define below provides a no-op define.  
 27         
 28         There are 3 prefetch() macros:
 29         
 30         prefetch(x)     - prefetches the cacheline at "x" for read
 31         prefetchw(x)    - prefetches the cacheline at "x" for write
 32         spin_lock_prefetch(x) - prefetches the spinlock *x for taking
 33         
 34         there is also PREFETCH_STRIDE which is the architecure-preferred 
 35         "lookahead" size for prefetching streamed operations.
 36         
 37 */
 38 
 39 #ifndef ARCH_HAS_PREFETCH
 40 #define prefetch(x) __builtin_prefetch(x)
 41 #endif
 42 
 43 #ifndef ARCH_HAS_PREFETCHW
 44 #define prefetchw(x) __builtin_prefetch(x,1)
 45 #endif
 46 
 47 #ifndef ARCH_HAS_SPINLOCK_PREFETCH
 48 #define spin_lock_prefetch(x) prefetchw(x)
 49 #endif
 50 
 51 #ifndef PREFETCH_STRIDE
 52 #define PREFETCH_STRIDE (4*L1_CACHE_BYTES)
 53 #endif
 54 
 55 static inline void prefetch_range(void *addr, size_t len)
 56 {
 57 #ifdef ARCH_HAS_PREFETCH
 58         char *cp;
 59         char *end = addr + len;
 60 
 61         for (cp = addr; cp < end; cp += PREFETCH_STRIDE)
 62                 prefetch(cp);
 63 #endif
 64 }
 65 
 66 static inline void prefetch_page_address(struct page *page)
 67 {
 68 #if defined(WANT_PAGE_VIRTUAL) || defined(HASHED_PAGE_VIRTUAL)
 69         prefetch(page);
 70 #endif
 71 }
 72 
 73 #endif
 74 

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