Implement the TLB flush routine to evict a sepcific Super TLB entry,
vs. moving to a new ASID on every such flush.
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
---
arch/arc/include/asm/hugepage.h | 4 ++++
arch/arc/mm/tlb.c | 20 ++++++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/arch/arc/include/asm/hugepage.h b/arch/arc/include/asm/hugepage.h
index d7614d2af454..bf74f507e038 100644
--- a/arch/arc/include/asm/hugepage.h
+++ b/arch/arc/include/asm/hugepage.h
@@ -75,4 +75,8 @@ extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
#define __HAVE_ARCH_PGTABLE_WITHDRAW
extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
+#define __HAVE_ARCH_FLUSH_PMD_TLB_RANGE
+extern void flush_pmd_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end);
+
#endif
diff --git a/arch/arc/mm/tlb.c b/arch/arc/mm/tlb.c
index 80e28555a5de..b28731c175b1 100644
--- a/arch/arc/mm/tlb.c
+++ b/arch/arc/mm/tlb.c
@@ -626,6 +626,26 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
return pgtable;
}
+void flush_pmd_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ unsigned int cpu;
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ cpu = smp_processor_id();
+
+ if (likely(asid_mm(vma->vm_mm, cpu) != MM_CTXT_NO_ASID)) {
+ unsigned int asid = hw_pid(vma->vm_mm, cpu);
+
+ /* No need to loop here: this will always be for 1 Huge Page */
+ tlb_entry_erase(start | _PAGE_HW_SZ | asid);
+ }
+
+ local_irq_restore(flags);
+}
+
#endif
/* Read the Cache Build Confuration Registers, Decode them and save into
--
1.9.1
--
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