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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>
87 lines
3.5 KiB
C
87 lines
3.5 KiB
C
#ifndef _SPARC_CACHEFLUSH_H
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#define _SPARC_CACHEFLUSH_H
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#include <linux/mm.h> /* Common for other includes */
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// #include <linux/kernel.h> from pgalloc.h
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// #include <linux/sched.h> from pgalloc.h
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// #include <asm/page.h>
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#include <asm/btfixup.h>
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/*
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* Fine grained cache flushing.
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*/
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#ifdef CONFIG_SMP
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BTFIXUPDEF_CALL(void, local_flush_cache_all, void)
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BTFIXUPDEF_CALL(void, local_flush_cache_mm, struct mm_struct *)
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BTFIXUPDEF_CALL(void, local_flush_cache_range, struct vm_area_struct *, unsigned long, unsigned long)
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BTFIXUPDEF_CALL(void, local_flush_cache_page, struct vm_area_struct *, unsigned long)
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#define local_flush_cache_all() BTFIXUP_CALL(local_flush_cache_all)()
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#define local_flush_cache_mm(mm) BTFIXUP_CALL(local_flush_cache_mm)(mm)
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#define local_flush_cache_range(vma,start,end) BTFIXUP_CALL(local_flush_cache_range)(vma,start,end)
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#define local_flush_cache_page(vma,addr) BTFIXUP_CALL(local_flush_cache_page)(vma,addr)
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BTFIXUPDEF_CALL(void, local_flush_page_to_ram, unsigned long)
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BTFIXUPDEF_CALL(void, local_flush_sig_insns, struct mm_struct *, unsigned long)
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#define local_flush_page_to_ram(addr) BTFIXUP_CALL(local_flush_page_to_ram)(addr)
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#define local_flush_sig_insns(mm,insn_addr) BTFIXUP_CALL(local_flush_sig_insns)(mm,insn_addr)
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extern void smp_flush_cache_all(void);
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extern void smp_flush_cache_mm(struct mm_struct *mm);
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extern void smp_flush_cache_range(struct vm_area_struct *vma,
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unsigned long start,
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unsigned long end);
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extern void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page);
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extern void smp_flush_page_to_ram(unsigned long page);
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extern void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr);
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#endif /* CONFIG_SMP */
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BTFIXUPDEF_CALL(void, flush_cache_all, void)
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BTFIXUPDEF_CALL(void, flush_cache_mm, struct mm_struct *)
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BTFIXUPDEF_CALL(void, flush_cache_range, struct vm_area_struct *, unsigned long, unsigned long)
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BTFIXUPDEF_CALL(void, flush_cache_page, struct vm_area_struct *, unsigned long)
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#define flush_cache_all() BTFIXUP_CALL(flush_cache_all)()
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#define flush_cache_mm(mm) BTFIXUP_CALL(flush_cache_mm)(mm)
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#define flush_cache_dup_mm(mm) BTFIXUP_CALL(flush_cache_mm)(mm)
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#define flush_cache_range(vma,start,end) BTFIXUP_CALL(flush_cache_range)(vma,start,end)
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#define flush_cache_page(vma,addr,pfn) BTFIXUP_CALL(flush_cache_page)(vma,addr)
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#define flush_icache_range(start, end) do { } while (0)
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#define flush_icache_page(vma, pg) do { } while (0)
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#define flush_icache_user_range(vma,pg,adr,len) do { } 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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} 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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BTFIXUPDEF_CALL(void, __flush_page_to_ram, unsigned long)
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BTFIXUPDEF_CALL(void, flush_sig_insns, struct mm_struct *, unsigned long)
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#define __flush_page_to_ram(addr) BTFIXUP_CALL(__flush_page_to_ram)(addr)
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#define flush_sig_insns(mm,insn_addr) BTFIXUP_CALL(flush_sig_insns)(mm,insn_addr)
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extern void sparc_flush_page_to_ram(struct page *page);
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#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
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#define flush_dcache_page(page) sparc_flush_page_to_ram(page)
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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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#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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#endif /* _SPARC_CACHEFLUSH_H */
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