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authorGuo Ren <ren_guo@c-sky.com>2019-06-18 20:33:32 +0800
committerGuo Ren <ren_guo@c-sky.com>2019-07-19 14:21:36 +0800
commit22d55f02b8922a097cd4be1e2f131dfa7ef65901 (patch)
treee8e0c0f8c5071343902090aa225fb92bd5747536 /arch/csky/include/asm/mmu_context.h
parenta231b8839cd4259de1d37a78165739a4d5d08e72 (diff)
downloadlinux-sh-22d55f02b8922a097cd4be1e2f131dfa7ef65901.tar.gz
csky: Use generic asid algorithm to implement switch_mm
Use linux generic asid/vmid algorithm to implement csky switch_mm function. The algorithm is from arm and it could work with SMP system. It'll help reduce tlb flush for switch_mm in task/vm switch. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/csky/include/asm/mmu_context.h')
-rw-r--r--arch/csky/include/asm/mmu_context.h12
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/csky/include/asm/mmu_context.h b/arch/csky/include/asm/mmu_context.h
index 86dde481df76..0285b0ad18b6 100644
--- a/arch/csky/include/asm/mmu_context.h
+++ b/arch/csky/include/asm/mmu_context.h
@@ -20,20 +20,28 @@
#define TLBMISS_HANDLER_SETUP_PGD_KERNEL(pgd) \
setup_pgd(__pa(pgd), true)
-#define init_new_context(tsk,mm) 0
+#define ASID_MASK ((1 << CONFIG_CPU_ASID_BITS) - 1)
+#define cpu_asid(mm) (atomic64_read(&mm->context.asid) & ASID_MASK)
+
+#define init_new_context(tsk,mm) ({ atomic64_set(&(mm)->context.asid, 0); 0; })
#define activate_mm(prev,next) switch_mm(prev, next, current)
#define destroy_context(mm) do {} while (0)
#define enter_lazy_tlb(mm, tsk) do {} while (0)
#define deactivate_mm(tsk, mm) do {} while (0)
+void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
+
static inline void
switch_mm(struct mm_struct *prev, struct mm_struct *next,
struct task_struct *tsk)
{
+ unsigned int cpu = smp_processor_id();
+
if (prev != next)
- tlb_invalid_all();
+ check_and_switch_context(next, cpu);
TLBMISS_HANDLER_SETUP_PGD(next->pgd);
+ write_mmu_entryhi(next->context.asid.counter);
}
#endif /* __ASM_CSKY_MMU_CONTEXT_H */