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>
157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
#ifndef _M68K_CACHEFLUSH_H
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#define _M68K_CACHEFLUSH_H
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#include <linux/mm.h>
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/* cache code */
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#define FLUSH_I_AND_D (0x00000808)
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#define FLUSH_I (0x00000008)
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/*
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* Cache handling functions
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*/
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static inline void flush_icache(void)
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{
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if (CPU_IS_040_OR_060)
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asm volatile ( "nop\n"
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" .chip 68040\n"
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" cpusha %bc\n"
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" .chip 68k");
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else {
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unsigned long tmp;
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asm volatile ( "movec %%cacr,%0\n"
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" or.w %1,%0\n"
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" movec %0,%%cacr"
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: "=&d" (tmp)
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: "id" (FLUSH_I));
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}
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}
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/*
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* invalidate the cache for the specified memory range.
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* It starts at the physical address specified for
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* the given number of bytes.
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*/
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extern void cache_clear(unsigned long paddr, int len);
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/*
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* push any dirty cache in the specified memory range.
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* It starts at the physical address specified for
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* the given number of bytes.
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*/
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extern void cache_push(unsigned long paddr, int len);
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/*
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* push and invalidate pages in the specified user virtual
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* memory range.
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*/
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extern void cache_push_v(unsigned long vaddr, int len);
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/* This is needed whenever the virtual mapping of the current
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process changes. */
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#define __flush_cache_all() \
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({ \
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if (CPU_IS_040_OR_060) \
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__asm__ __volatile__("nop\n\t" \
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".chip 68040\n\t" \
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"cpusha %dc\n\t" \
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".chip 68k"); \
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else { \
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unsigned long _tmp; \
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__asm__ __volatile__("movec %%cacr,%0\n\t" \
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"orw %1,%0\n\t" \
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"movec %0,%%cacr" \
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: "=&d" (_tmp) \
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: "di" (FLUSH_I_AND_D)); \
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} \
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})
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#define __flush_cache_030() \
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({ \
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if (CPU_IS_020_OR_030) { \
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unsigned long _tmp; \
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__asm__ __volatile__("movec %%cacr,%0\n\t" \
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"orw %1,%0\n\t" \
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"movec %0,%%cacr" \
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: "=&d" (_tmp) \
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: "di" (FLUSH_I_AND_D)); \
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} \
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})
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#define flush_cache_all() __flush_cache_all()
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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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static inline void flush_cache_mm(struct mm_struct *mm)
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{
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if (mm == current->mm)
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__flush_cache_030();
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}
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#define flush_cache_dup_mm(mm) flush_cache_mm(mm)
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/* flush_cache_range/flush_cache_page must be macros to avoid
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a dependency on linux/mm.h, which includes this file... */
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static inline void 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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{
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if (vma->vm_mm == current->mm)
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__flush_cache_030();
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}
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static inline void flush_cache_page(struct vm_area_struct *vma, unsigned long vmaddr, unsigned long pfn)
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{
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if (vma->vm_mm == current->mm)
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__flush_cache_030();
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}
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/* Push the page at kernel virtual address and clear the icache */
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/* RZ: use cpush %bc instead of cpush %dc, cinv %ic */
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static inline void __flush_page_to_ram(void *vaddr)
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{
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if (CPU_IS_040_OR_060) {
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__asm__ __volatile__("nop\n\t"
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".chip 68040\n\t"
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"cpushp %%bc,(%0)\n\t"
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".chip 68k"
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: : "a" (__pa(vaddr)));
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} else {
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unsigned long _tmp;
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__asm__ __volatile__("movec %%cacr,%0\n\t"
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"orw %1,%0\n\t"
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"movec %0,%%cacr"
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: "=&d" (_tmp)
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: "di" (FLUSH_I));
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}
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}
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#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
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#define flush_dcache_page(page) __flush_page_to_ram(page_address(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_icache_page(vma, page) __flush_page_to_ram(page_address(page))
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extern void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
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unsigned long addr, int len);
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extern void flush_icache_range(unsigned long address, unsigned long endaddr);
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static inline void copy_to_user_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vaddr,
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void *dst, void *src, int len)
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{
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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_icache_user_range(vma, page, vaddr, len);
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}
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static inline void copy_from_user_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vaddr,
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void *dst, void *src, int len)
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{
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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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}
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#endif /* _M68K_CACHEFLUSH_H */
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