[PATCH 10/11] ARCv2: mm: THP: Implement flush_pmd_tlb_range() optimization
From: Vineet Gupta <hidden>
Date: 2015-08-27 09:05:15
Also in:
linux-arch
Subsystem:
synopsys arc architecture, the rest · Maintainers:
Vineet Gupta, Linus Torvalds
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 <redacted> --- 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 211d59347047..d57272c4caf7 100644
--- a/arch/arc/mm/tlb.c
+++ b/arch/arc/mm/tlb.c@@ -629,6 +629,26 @@ 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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