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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>
125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
#ifndef _PARISC_CACHEFLUSH_H
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#define _PARISC_CACHEFLUSH_H
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#include <linux/mm.h>
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/* The usual comment is "Caches aren't brain-dead on the <architecture>".
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* Unfortunately, that doesn't apply to PA-RISC. */
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/* Internal implementation */
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void flush_data_cache_local(void *); /* flushes local data-cache only */
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void flush_instruction_cache_local(void *); /* flushes local code-cache only */
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#ifdef CONFIG_SMP
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void flush_data_cache(void); /* flushes data-cache only (all processors) */
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void flush_instruction_cache(void); /* flushes i-cache only (all processors) */
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#else
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#define flush_data_cache() flush_data_cache_local(NULL)
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#define flush_instruction_cache() flush_instruction_cache_local(NULL)
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#endif
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#define flush_cache_dup_mm(mm) flush_cache_mm(mm)
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void flush_user_icache_range_asm(unsigned long, unsigned long);
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void flush_kernel_icache_range_asm(unsigned long, unsigned long);
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void flush_user_dcache_range_asm(unsigned long, unsigned long);
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void flush_kernel_dcache_range_asm(unsigned long, unsigned long);
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void flush_kernel_dcache_page_asm(void *);
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void flush_kernel_icache_page(void *);
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void flush_user_dcache_page(unsigned long);
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void flush_user_icache_page(unsigned long);
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void flush_user_dcache_range(unsigned long, unsigned long);
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void flush_user_icache_range(unsigned long, unsigned long);
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/* Cache flush operations */
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void flush_cache_all_local(void);
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void flush_cache_all(void);
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void flush_cache_mm(struct mm_struct *mm);
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#define flush_kernel_dcache_range(start,size) \
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flush_kernel_dcache_range_asm((start), (start)+(size));
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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 ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
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extern void flush_dcache_page(struct page *page);
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#define flush_dcache_mmap_lock(mapping) \
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spin_lock_irq(&(mapping)->tree_lock)
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#define flush_dcache_mmap_unlock(mapping) \
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spin_unlock_irq(&(mapping)->tree_lock)
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#define flush_icache_page(vma,page) do { \
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flush_kernel_dcache_page(page); \
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flush_kernel_icache_page(page_address(page)); \
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} while (0)
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#define flush_icache_range(s,e) do { \
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flush_kernel_dcache_range_asm(s,e); \
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flush_kernel_icache_range_asm(s,e); \
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} while (0)
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#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
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do { \
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flush_cache_page(vma, vaddr, page_to_pfn(page)); \
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memcpy(dst, src, len); \
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flush_kernel_dcache_range_asm((unsigned long)dst, (unsigned long)dst + len); \
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} while (0)
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#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
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do { \
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flush_cache_page(vma, vaddr, page_to_pfn(page)); \
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memcpy(dst, src, len); \
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} while (0)
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void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn);
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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_HAS_FLUSH_ANON_PAGE
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static inline void
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flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr)
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{
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if (PageAnon(page))
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flush_user_dcache_page(vmaddr);
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}
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#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
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void flush_kernel_dcache_page_addr(void *addr);
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static inline void flush_kernel_dcache_page(struct page *page)
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{
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flush_kernel_dcache_page_addr(page_address(page));
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}
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#ifdef CONFIG_DEBUG_RODATA
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void mark_rodata_ro(void);
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#endif
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#ifdef CONFIG_PA8X00
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/* Only pa8800, pa8900 needs this */
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#include <asm/kmap_types.h>
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#define ARCH_HAS_KMAP
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void kunmap_parisc(void *addr);
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static inline void *kmap(struct page *page)
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{
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might_sleep();
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return page_address(page);
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}
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#define kunmap(page) kunmap_parisc(page_address(page))
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#define kmap_atomic(page, idx) page_address(page)
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#define kunmap_atomic(addr, idx) kunmap_parisc(addr)
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#define kmap_atomic_pfn(pfn, idx) page_address(pfn_to_page(pfn))
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#define kmap_atomic_to_page(ptr) virt_to_page(ptr)
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#endif
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#endif /* _PARISC_CACHEFLUSH_H */
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