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author | Paul Burton <paul.burton@mips.com> | 2019-02-02 04:43:25 +0300 |
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committer | Paul Burton <paul.burton@mips.com> | 2019-02-04 21:56:30 +0300 |
commit | 42d5b846574f0904dbaf9dbdea4f19402589cddf (patch) | |
tree | 77fdb7637de77008be9443b6b16de0be15beacb5 /arch/mips/mm | |
parent | 4ebea49ce233ce76421250f113a75d6d33c90e22 (diff) | |
download | linux-42d5b846574f0904dbaf9dbdea4f19402589cddf.tar.xz |
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version & get a new one if it's outdated, and a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 <paul.burton@mips.com>
Cc: linux-mips@vger.kernel.org
Diffstat (limited to 'arch/mips/mm')
-rw-r--r-- | arch/mips/mm/context.c | 18 |
1 files changed, 18 insertions, 0 deletions
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); +} |