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>
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* arch/sh/mm/kmap.c
|
|
*
|
|
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
|
|
* Copyright (C) 2002 - 2009 Paul Mundt
|
|
*/
|
|
#include <linux/mm.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/module.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
static pte_t *kmap_coherent_pte;
|
|
|
|
void __init kmap_coherent_init(void)
|
|
{
|
|
unsigned long vaddr;
|
|
|
|
/* cache the first coherent kmap pte */
|
|
vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
|
|
kmap_coherent_pte = virt_to_kpte(vaddr);
|
|
}
|
|
|
|
void *kmap_coherent(struct page *page, unsigned long addr)
|
|
{
|
|
struct folio *folio = page_folio(page);
|
|
enum fixed_addresses idx;
|
|
unsigned long vaddr;
|
|
|
|
BUG_ON(!test_bit(PG_dcache_clean, &folio->flags));
|
|
|
|
preempt_disable();
|
|
pagefault_disable();
|
|
|
|
idx = FIX_CMAP_END -
|
|
(((addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1)) +
|
|
(FIX_N_COLOURS * smp_processor_id()));
|
|
|
|
vaddr = __fix_to_virt(idx);
|
|
|
|
BUG_ON(!pte_none(*(kmap_coherent_pte - idx)));
|
|
set_pte(kmap_coherent_pte - idx, mk_pte(page, PAGE_KERNEL));
|
|
|
|
return (void *)vaddr;
|
|
}
|
|
|
|
void kunmap_coherent(void *kvaddr)
|
|
{
|
|
if (kvaddr >= (void *)FIXADDR_START) {
|
|
unsigned long vaddr = (unsigned long)kvaddr & PAGE_MASK;
|
|
enum fixed_addresses idx = __virt_to_fix(vaddr);
|
|
|
|
/* XXX.. Kill this later, here for sanity at the moment.. */
|
|
__flush_purge_region((void *)vaddr, PAGE_SIZE);
|
|
|
|
pte_clear(&init_mm, vaddr, kmap_coherent_pte - idx);
|
|
local_flush_tlb_one(get_asid(), vaddr);
|
|
}
|
|
|
|
pagefault_enable();
|
|
preempt_enable();
|
|
}
|