forked from luck/tmp_suning_uos_patched
4ad35c1f56
610 has vipt aliasing issue, so we need to finish the cache flush apis mentioned in cachetlb.rst to avoid data corruption. Here is the list of modified apis in the patch: - flush_kernel_dcache_page (new add) - flush_dcache_mmap_lock (new add) - flush_dcache_mmap_unlock (new add) - flush_kernel_vmap_range (new add) - invalidate_kernel_vmap_range (new add) - flush_anon_page (new add) - flush_cache_range (new add) - flush_cache_vmap (flush all) - flush_cache_vunmap (flush all) - flush_cache_mm (only dcache flush) - flush_icache_page (just nop) - copy_from_user_page (remove no need flush) - copy_to_user_page (remove no need flush) Change to V2: - Fixup compile error with xa_lock*(&mapping->i_pages) Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Christoph Hellwig <hch@infradead.org>
77 lines
1.5 KiB
C
77 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/syscalls.h>
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#include <linux/spinlock.h>
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#include <asm/page.h>
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#include <asm/cache.h>
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#include <asm/cacheflush.h>
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#include <asm/cachectl.h>
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#define PG_dcache_clean PG_arch_1
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void flush_dcache_page(struct page *page)
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{
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struct address_space *mapping;
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if (page == ZERO_PAGE(0))
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return;
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mapping = page_mapping_file(page);
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if (mapping && !page_mapcount(page))
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clear_bit(PG_dcache_clean, &page->flags);
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else {
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dcache_wbinv_all();
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if (mapping)
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icache_inv_all();
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set_bit(PG_dcache_clean, &page->flags);
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}
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}
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EXPORT_SYMBOL(flush_dcache_page);
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void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
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pte_t *ptep)
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{
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unsigned long pfn = pte_pfn(*ptep);
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struct page *page;
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if (!pfn_valid(pfn))
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return;
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page = pfn_to_page(pfn);
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if (page == ZERO_PAGE(0))
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return;
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if (!test_and_set_bit(PG_dcache_clean, &page->flags))
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dcache_wbinv_all();
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if (page_mapping_file(page)) {
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if (vma->vm_flags & VM_EXEC)
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icache_inv_all();
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}
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}
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void flush_kernel_dcache_page(struct page *page)
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{
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struct address_space *mapping;
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mapping = page_mapping_file(page);
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if (!mapping || mapping_mapped(mapping))
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dcache_wbinv_all();
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}
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EXPORT_SYMBOL(flush_kernel_dcache_page);
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void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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dcache_wbinv_all();
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if (vma->vm_flags & VM_EXEC)
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icache_inv_all();
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}
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