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MIPS: mm: Unify ASID version checks

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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version & get a new one if it's outdated, and a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
This commit is contained in:
Paul Burton
2019-02-02 01:43:25 +00:00
parent 4ebea49ce2
commit 42d5b84657
4 changed files with 28 additions and 26 deletions
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18
arch/mips/mm/context.c
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@@ -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);
}