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authorVineet Gupta <vgupta@synopsys.com>2015-02-27 17:06:35 +0300
committerVineet Gupta <vgupta@synopsys.com>2015-10-17 15:18:21 +0300
commit722fe8fd365a08bd53e9dd105009ab810107b02d (patch)
tree4077fb1d215b61bc53e3b5a5a34ea584c92ceac3 /arch/arc
parent12ebc1581ad114543ae822aa3a12f76072e2f902 (diff)
downloadlinux-722fe8fd365a08bd53e9dd105009ab810107b02d.tar.xz
ARCv2: mm: THP: Implement flush_pmd_tlb_range() optimization
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@synopsys.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/include/asm/hugepage.h4
-rw-r--r--arch/arc/mm/tlb.c20
2 files changed, 24 insertions, 0 deletions
diff --git a/arch/arc/include/asm/hugepage.h b/arch/arc/include/asm/hugepage.h
index 1d0700c32b82..c5094de86403 100644
--- a/arch/arc/include/asm/hugepage.h
+++ b/arch/arc/include/asm/hugepage.h
@@ -74,4 +74,8 @@ 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 91905b1c3d72..005090e425f4 100644
--- a/arch/arc/mm/tlb.c
+++ b/arch/arc/mm/tlb.c
@@ -659,6 +659,26 @@ 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