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authorPaul Burton <paul.burton@mips.com>2019-02-02 01:43:25 +0000
committerPaul Burton <paul.burton@mips.com>2019-02-04 10:56:30 -0800
commit42d5b846574f0904dbaf9dbdea4f19402589cddf (patch)
tree77fdb7637de77008be9443b6b16de0be15beacb5 /arch/mips/mm
parent4ebea49ce233ce76421250f113a75d6d33c90e22 (diff)
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Introduce a new check_mmu_context() function to check an mm's ASID version & get a new one if it's outdated, and a check_switch_mmu_context() function which additionally sets up the new ASID & page directory.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.c18
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);
+}