diff options
| author | Huacai Chen <chenhc@lemote.com> | 2020-03-25 11:44:54 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-17 10:48:47 +0200 |
| commit | 67dea3c78e6eb05f27c606400349efbf829bc249 (patch) | |
| tree | f8216a7581cba56349b2482312eb0158761062ec /arch/mips | |
| parent | 76b48e986967d4c6536d09f99fb932829242e747 (diff) | |
MIPS/tlbex: Fix LDDIR usage in setup_pw() for Loongson-3
commit d191aaffe3687d1e73e644c185f5f0550ec242b5 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>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/mm/tlbex.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c index 3944c49eee0c..620abc968624 100644 --- a/arch/mips/mm/tlbex.c +++ b/arch/mips/mm/tlbex.c @@ -1479,6 +1479,7 @@ 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; @@ -1505,6 +1506,7 @@ 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); @@ -1515,8 +1517,9 @@ 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 */ } |