From 42d5b846574f0904dbaf9dbdea4f19402589cddf Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Sat, 2 Feb 2019 01:43:25 +0000 Subject: MIPS: mm: Unify ASID version checks Introduce a new check_mmu_context() function to check an mm's ASID version & get a new one if it's outdated, and a check_switch_mmu_context() function which additionally sets up the new ASID & page directory. Simplify switch_mm() & various get_new_mmu_context() callsites in MIPS KVM by making use of the new functions, which will help reduce the amount of code that requires modification to gain MMID support. Signed-off-by: Paul Burton Cc: linux-mips@vger.kernel.org --- arch/mips/mm/context.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'arch/mips/mm') diff --git a/arch/mips/mm/context.c b/arch/mips/mm/context.c index b5af471006f0..4dd976acf41d 100644 --- a/arch/mips/mm/context.c +++ b/arch/mips/mm/context.c @@ -17,3 +17,21 @@ void get_new_mmu_context(struct mm_struct *mm) cpu_context(cpu, mm) = asid_cache(cpu) = asid; } + +void check_mmu_context(struct mm_struct *mm) +{ + unsigned int cpu = smp_processor_id(); + + /* Check if our ASID is of an older version and thus invalid */ + if ((cpu_context(cpu, mm) ^ asid_cache(cpu)) & asid_version_mask(cpu)) + get_new_mmu_context(mm); +} + +void check_switch_mmu_context(struct mm_struct *mm) +{ + unsigned int cpu = smp_processor_id(); + + check_mmu_context(mm); + write_c0_entryhi(cpu_asid(cpu, mm)); + TLBMISS_HANDLER_SETUP_PGD(mm->pgd); +} -- cgit v1.2.3