mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 23:23:55 +08:00
55661fc1f1
This follows the ARM change c01778001a
("ARM: 6379/1: Assume new page cache pages have dirty D-cache") for the
same rationale:
There are places in Linux where writes to newly allocated page
cache pages happen without a subsequent call to flush_dcache_page()
(several PIO drivers including USB HCD). This patch changes the
meaning of PG_arch_1 to be PG_dcache_clean and always flush the
D-cache for a newly mapped page in update_mmu_cache().
This addresses issues seen with executing binaries from MMC, in
addition to some of the other HCDs that don't explicitly do cache
management for their pipe-in buffers.
Requested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/*
|
|
* arch/sh/mm/kmap.c
|
|
*
|
|
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
|
|
* Copyright (C) 2002 - 2009 Paul Mundt
|
|
*
|
|
* Released under the terms of the GNU GPL v2.0.
|
|
*/
|
|
#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>
|
|
|
|
#define kmap_get_fixmap_pte(vaddr) \
|
|
pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
|
|
|
|
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 = kmap_get_fixmap_pte(vaddr);
|
|
}
|
|
|
|
void *kmap_coherent(struct page *page, unsigned long addr)
|
|
{
|
|
enum fixed_addresses idx;
|
|
unsigned long vaddr;
|
|
|
|
BUG_ON(!test_bit(PG_dcache_clean, &page->flags));
|
|
|
|
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();
|
|
}
|