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157efa2904
Add PFN_PTE_SHIFT, update_mmu_cache_range(), flush_dcache_folio() and flush_icache_pages(). Change the PG_dcache_clean flag from being per-page to per-folio. Flush the entire folio containing the pages in flush_icache_pages() for ease of implementation. Link: https://lkml.kernel.org/r/20230802151406.3735276-25-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Acked-by: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Rich Felker <dalias@libc.org> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* arch/sh/mm/kmap.c
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*
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* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
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* Copyright (C) 2002 - 2009 Paul Mundt
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*/
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/mutex.h>
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#include <linux/fs.h>
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#include <linux/highmem.h>
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#include <linux/module.h>
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#include <asm/mmu_context.h>
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#include <asm/cacheflush.h>
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static pte_t *kmap_coherent_pte;
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void __init kmap_coherent_init(void)
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{
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unsigned long vaddr;
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/* cache the first coherent kmap pte */
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vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
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kmap_coherent_pte = virt_to_kpte(vaddr);
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}
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void *kmap_coherent(struct page *page, unsigned long addr)
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{
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struct folio *folio = page_folio(page);
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enum fixed_addresses idx;
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unsigned long vaddr;
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BUG_ON(!test_bit(PG_dcache_clean, &folio->flags));
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preempt_disable();
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pagefault_disable();
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idx = FIX_CMAP_END -
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(((addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1)) +
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(FIX_N_COLOURS * smp_processor_id()));
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vaddr = __fix_to_virt(idx);
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BUG_ON(!pte_none(*(kmap_coherent_pte - idx)));
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set_pte(kmap_coherent_pte - idx, mk_pte(page, PAGE_KERNEL));
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return (void *)vaddr;
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}
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void kunmap_coherent(void *kvaddr)
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{
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if (kvaddr >= (void *)FIXADDR_START) {
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unsigned long vaddr = (unsigned long)kvaddr & PAGE_MASK;
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enum fixed_addresses idx = __virt_to_fix(vaddr);
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/* XXX.. Kill this later, here for sanity at the moment.. */
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__flush_purge_region((void *)vaddr, PAGE_SIZE);
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pte_clear(&init_mm, vaddr, kmap_coherent_pte - idx);
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local_flush_tlb_one(get_asid(), vaddr);
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}
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pagefault_enable();
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preempt_enable();
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}
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