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Diffstat (limited to 'arch/sh/include/asm/tlb.h')
-rw-r--r--arch/sh/include/asm/tlb.h100
1 files changed, 92 insertions, 8 deletions
diff --git a/arch/sh/include/asm/tlb.h b/arch/sh/include/asm/tlb.h
index 88ff1ae8a6b..9c16f737074 100644
--- a/arch/sh/include/asm/tlb.h
+++ b/arch/sh/include/asm/tlb.h
@@ -6,22 +6,106 @@
#endif
#ifndef __ASSEMBLY__
+#include <linux/pagemap.h>
+
+#ifdef CONFIG_MMU
+#include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+
+/*
+ * TLB handling. This allows us to remove pages from the page
+ * tables, and efficiently handle the TLB issues.
+ */
+struct mmu_gather {
+ struct mm_struct *mm;
+ unsigned int fullmm;
+ unsigned long start, end;
+};
-#define tlb_start_vma(tlb, vma) \
- flush_cache_range(vma, vma->vm_start, vma->vm_end)
+DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
-#define tlb_end_vma(tlb, vma) \
- flush_tlb_range(vma, vma->vm_start, vma->vm_end)
+static inline void init_tlb_gather(struct mmu_gather *tlb)
+{
+ tlb->start = TASK_SIZE;
+ tlb->end = 0;
-#define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0)
+ if (tlb->fullmm) {
+ tlb->start = 0;
+ tlb->end = TASK_SIZE;
+ }
+}
+
+static inline struct mmu_gather *
+tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
+{
+ struct mmu_gather *tlb = &get_cpu_var(mmu_gathers);
+
+ tlb->mm = mm;
+ tlb->fullmm = full_mm_flush;
+
+ init_tlb_gather(tlb);
+
+ return tlb;
+}
+
+static inline void
+tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
+{
+ if (tlb->fullmm)
+ flush_tlb_mm(tlb->mm);
+
+ /* keep the page table cache within bounds */
+ check_pgt_cache();
+
+ put_cpu_var(mmu_gathers);
+}
+
+static inline void
+tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
+{
+ if (tlb->start > address)
+ tlb->start = address;
+ if (tlb->end < address + PAGE_SIZE)
+ tlb->end = address + PAGE_SIZE;
+}
/*
- * Flush whole TLBs for MM
+ * In the case of tlb vma handling, we can optimise these away in the
+ * case where we're doing a full MM flush. When we're doing a munmap,
+ * the vmas are adjusted to only cover the region to be torn down.
*/
-#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
+static inline void
+tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
+{
+ if (!tlb->fullmm)
+ flush_cache_range(vma, vma->vm_start, vma->vm_end);
+}
+
+static inline void
+tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
+{
+ if (!tlb->fullmm && tlb->end) {
+ flush_tlb_range(vma, tlb->start, tlb->end);
+ init_tlb_gather(tlb);
+ }
+}
+
+#define tlb_remove_page(tlb,page) free_page_and_swap_cache(page)
+#define pte_free_tlb(tlb, ptep) pte_free((tlb)->mm, ptep)
+#define pmd_free_tlb(tlb, pmdp) pmd_free((tlb)->mm, pmdp)
+#define pud_free_tlb(tlb, pudp) pud_free((tlb)->mm, pudp)
+
+#define tlb_migrate_finish(mm) do { } while (0)
+
+#else /* CONFIG_MMU */
+
+#define tlb_start_vma(tlb, vma) do { } while (0)
+#define tlb_end_vma(tlb, vma) do { } while (0)
+#define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0)
+#define tlb_flush(tlb) do { } while (0)
-#include <linux/pagemap.h>
#include <asm-generic/tlb.h>
+#endif /* CONFIG_MMU */
#endif /* __ASSEMBLY__ */
#endif /* __ASM_SH_TLB_H */