2d4dc890b5
Mtdblock driver doesn't call flush_dcache_page for pages in request. So, this causes problems on architectures where the icache doesn't fill from the dcache or with dcache aliases. The patch fixes this. The ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE symbol was introduced to avoid pointless empty cache-thrashing loops on architectures for which flush_dcache_page() is a no-op. Every architecture was provided with this flush pages on architectires where ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE is equal 1 or do nothing otherwise. See "fix mtd_blkdevs problem with caches on some architectures" discussion on LKML for more information. Signed-off-by: Ilya Loginov <isloginov@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Peter Horton <phorton@bitbox.co.uk> Cc: "Ed L. Cashin" <ecashin@coraid.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
#ifndef __ASM_SH_CACHEFLUSH_H
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#define __ASM_SH_CACHEFLUSH_H
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#ifdef __KERNEL__
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#include <linux/mm.h>
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/*
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* Cache flushing:
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*
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* - flush_cache_all() flushes entire cache
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* - flush_cache_mm(mm) flushes the specified mm context's cache lines
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* - flush_cache_dup mm(mm) handles cache flushing when forking
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* - flush_cache_page(mm, vmaddr, pfn) flushes a single page
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* - flush_cache_range(vma, start, end) flushes a range of pages
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*
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* - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
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* - flush_icache_range(start, end) flushes(invalidates) a range for icache
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* - flush_icache_page(vma, pg) flushes(invalidates) a page for icache
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* - flush_cache_sigtramp(vaddr) flushes the signal trampoline
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*/
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extern void (*local_flush_cache_all)(void *args);
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extern void (*local_flush_cache_mm)(void *args);
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extern void (*local_flush_cache_dup_mm)(void *args);
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extern void (*local_flush_cache_page)(void *args);
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extern void (*local_flush_cache_range)(void *args);
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extern void (*local_flush_dcache_page)(void *args);
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extern void (*local_flush_icache_range)(void *args);
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extern void (*local_flush_icache_page)(void *args);
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extern void (*local_flush_cache_sigtramp)(void *args);
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static inline void cache_noop(void *args) { }
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extern void (*__flush_wback_region)(void *start, int size);
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extern void (*__flush_purge_region)(void *start, int size);
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extern void (*__flush_invalidate_region)(void *start, int size);
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extern void flush_cache_all(void);
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extern void flush_cache_mm(struct mm_struct *mm);
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extern void flush_cache_dup_mm(struct mm_struct *mm);
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extern void flush_cache_page(struct vm_area_struct *vma,
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unsigned long addr, unsigned long pfn);
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extern void flush_cache_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end);
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#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
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extern void flush_dcache_page(struct page *page);
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extern void flush_icache_range(unsigned long start, unsigned long end);
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extern void flush_icache_page(struct vm_area_struct *vma,
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struct page *page);
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extern void flush_cache_sigtramp(unsigned long address);
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struct flusher_data {
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struct vm_area_struct *vma;
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unsigned long addr1, addr2;
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};
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#define ARCH_HAS_FLUSH_ANON_PAGE
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extern void __flush_anon_page(struct page *page, unsigned long);
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static inline void flush_anon_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vmaddr)
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{
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if (boot_cpu_data.dcache.n_aliases && PageAnon(page))
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__flush_anon_page(page, vmaddr);
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}
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#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
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static inline void flush_kernel_dcache_page(struct page *page)
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{
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flush_dcache_page(page);
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}
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extern void copy_to_user_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vaddr, void *dst, const void *src,
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unsigned long len);
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extern void copy_from_user_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vaddr, void *dst, const void *src,
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unsigned long len);
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#define flush_cache_vmap(start, end) flush_cache_all()
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#define flush_cache_vunmap(start, end) flush_cache_all()
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#define flush_dcache_mmap_lock(mapping) do { } while (0)
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#define flush_dcache_mmap_unlock(mapping) do { } while (0)
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void kmap_coherent_init(void);
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void *kmap_coherent(struct page *page, unsigned long addr);
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void kunmap_coherent(void *kvaddr);
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#define PG_dcache_dirty PG_arch_1
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void cpu_cache_init(void);
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#endif /* __KERNEL__ */
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#endif /* __ASM_SH_CACHEFLUSH_H */
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