diff options
| author | Huacai Chen <chenhuacai@loongson.cn> | 2023-06-29 20:58:44 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2023-06-29 20:58:44 +0800 |
| commit | 01158487af60cd3915e8c31924144caf29cb0767 (patch) | |
| tree | 01bdd88063128e646a6fdc394a9c2d8c7a138316 /arch/loongarch/kernel | |
| parent | e031a5f3f1eddb961a6ded8a21ab8189d8760860 (diff) | |
LoongArch: Introduce hardware page table walker
Loongson-3A6000 and newer processors have hardware page table walker
(PTW) support. PTW can handle all fastpaths of TLBI/TLBL/TLBS/TLBM
exceptions by hardware, software only need to handle slowpaths (page
faults).
BTW, PTW doesn't append _PAGE_MODIFIED for page table entries, so we
change pmd_dirty() and pte_dirty() to also check _PAGE_DIRTY for the
"dirty" attribute.
Signed-off-by: Liang Gao <gaoliang@loongson.cn>
Signed-off-by: Jun Yi <yijun@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/kernel')
| -rw-r--r-- | arch/loongarch/kernel/cpu-probe.c | 4 | ||||
| -rw-r--r-- | arch/loongarch/kernel/proc.c | 1 |
2 files changed, 5 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/cpu-probe.c b/arch/loongarch/kernel/cpu-probe.c index f42acc6c8df6..e925579c7a71 100644 --- a/arch/loongarch/kernel/cpu-probe.c +++ b/arch/loongarch/kernel/cpu-probe.c @@ -136,6 +136,10 @@ static void cpu_probe_common(struct cpuinfo_loongarch *c) c->options |= LOONGARCH_CPU_CRYPTO; elf_hwcap |= HWCAP_LOONGARCH_CRYPTO; } + if (config & CPUCFG2_PTW) { + c->options |= LOONGARCH_CPU_PTW; + elf_hwcap |= HWCAP_LOONGARCH_PTW; + } if (config & CPUCFG2_LVZP) { c->options |= LOONGARCH_CPU_LVZ; elf_hwcap |= HWCAP_LOONGARCH_LVZ; diff --git a/arch/loongarch/kernel/proc.c b/arch/loongarch/kernel/proc.c index d4b270630bb5..0d33cbc47e51 100644 --- a/arch/loongarch/kernel/proc.c +++ b/arch/loongarch/kernel/proc.c @@ -80,6 +80,7 @@ static int show_cpuinfo(struct seq_file *m, void *v) if (cpu_has_crc32) seq_printf(m, " crc32"); if (cpu_has_complex) seq_printf(m, " complex"); if (cpu_has_crypto) seq_printf(m, " crypto"); + if (cpu_has_ptw) seq_printf(m, " ptw"); if (cpu_has_lvz) seq_printf(m, " lvz"); if (cpu_has_lbt_x86) seq_printf(m, " lbt_x86"); if (cpu_has_lbt_arm) seq_printf(m, " lbt_arm"); |