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MIPS/tlbex: Fix LDDIR usage in setup_pw() for Loongson-3 

commit d191aaffe3 upstream.

LDDIR/LDPTE is Loongson-3's acceleration for Page Table Walking. If BD
(Base Directory, the 4th page directory) is not enabled, then GDOffset
is biased by BadVAddr[63:62]. So, if GDOffset (aka. BadVAddr[47:36] for
Loongson-3) is big enough, "0b11(BadVAddr[63:62])|BadVAddr[47:36]|...."
can far beyond pg_swapper_dir. This means the pg_swapper_dir may NOT be
accessed by LDDIR correctly, so fix it by set PWDirExt in CP0_PWCtl.

Cc: <stable@vger.kernel.org>
Signed-off-by: Pei Huang <huangpei@loongson.cn>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Huacai Chen 2020-03-25 11:44:54 +08:00 committed by Greg Kroah-Hartman
parent 4acbbe98e0
commit ed374eee8c
1 changed files with 4 additions and 1 deletions
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5
arch/mips/mm/tlbex.c
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@ -1480,6 +1480,7 @@ static void build_r4000_tlb_refill_handler(void)
static void setup_pw(void)
{
unsigned int pwctl;
unsigned long pgd_i, pgd_w;
#ifndef __PAGETABLE_PMD_FOLDED
unsigned long pmd_i, pmd_w;
@ -1506,6 +1507,7 @@ static void setup_pw(void)
pte_i = ilog2(_PAGE_GLOBAL);
pte_w = 0;
pwctl = 1 << 30; /* Set PWDirExt */
#ifndef __PAGETABLE_PMD_FOLDED
write_c0_pwfield(pgd_i << 24 | pmd_i << 12 | pt_i << 6 | pte_i);
@ -1516,8 +1518,9 @@ static void setup_pw(void)
#endif
#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
write_c0_pwctl(1 << 6 | psn);
pwctl |= (1 << 6 | psn);
#endif
write_c0_pwctl(pwctl);
write_c0_kpgd((long)swapper_pg_dir);
kscratch_used_mask |= (1 << 7); /* KScratch6 is used for KPGD */
}