• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 #ifndef __ASM_SH_TLB_H
2 #define __ASM_SH_TLB_H
3 
4 #ifdef CONFIG_SUPERH64
5 # include "tlb_64.h"
6 #endif
7 
8 #ifndef __ASSEMBLY__
9 #include <linux/pagemap.h>
10 
11 #ifdef CONFIG_MMU
12 #include <linux/swap.h>
13 #include <asm/pgalloc.h>
14 #include <asm/tlbflush.h>
15 #include <asm/mmu_context.h>
16 
17 /*
18  * TLB handling.  This allows us to remove pages from the page
19  * tables, and efficiently handle the TLB issues.
20  */
21 struct mmu_gather {
22 	struct mm_struct	*mm;
23 	unsigned int		fullmm;
24 	unsigned long		start, end;
25 };
26 
init_tlb_gather(struct mmu_gather * tlb)27 static inline void init_tlb_gather(struct mmu_gather *tlb)
28 {
29 	tlb->start = TASK_SIZE;
30 	tlb->end = 0;
31 
32 	if (tlb->fullmm) {
33 		tlb->start = 0;
34 		tlb->end = TASK_SIZE;
35 	}
36 }
37 
38 static inline void
tlb_gather_mmu(struct mmu_gather * tlb,struct mm_struct * mm,unsigned int full_mm_flush)39 tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned int full_mm_flush)
40 {
41 	tlb->mm = mm;
42 	tlb->fullmm = full_mm_flush;
43 
44 	init_tlb_gather(tlb);
45 }
46 
47 static inline void
tlb_finish_mmu(struct mmu_gather * tlb,unsigned long start,unsigned long end)48 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
49 {
50 	if (tlb->fullmm)
51 		flush_tlb_mm(tlb->mm);
52 
53 	/* keep the page table cache within bounds */
54 	check_pgt_cache();
55 }
56 
57 static inline void
tlb_remove_tlb_entry(struct mmu_gather * tlb,pte_t * ptep,unsigned long address)58 tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
59 {
60 	if (tlb->start > address)
61 		tlb->start = address;
62 	if (tlb->end < address + PAGE_SIZE)
63 		tlb->end = address + PAGE_SIZE;
64 }
65 
66 /*
67  * In the case of tlb vma handling, we can optimise these away in the
68  * case where we're doing a full MM flush.  When we're doing a munmap,
69  * the vmas are adjusted to only cover the region to be torn down.
70  */
71 static inline void
tlb_start_vma(struct mmu_gather * tlb,struct vm_area_struct * vma)72 tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
73 {
74 	if (!tlb->fullmm)
75 		flush_cache_range(vma, vma->vm_start, vma->vm_end);
76 }
77 
78 static inline void
tlb_end_vma(struct mmu_gather * tlb,struct vm_area_struct * vma)79 tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
80 {
81 	if (!tlb->fullmm && tlb->end) {
82 		flush_tlb_range(vma, tlb->start, tlb->end);
83 		init_tlb_gather(tlb);
84 	}
85 }
86 
tlb_flush_mmu(struct mmu_gather * tlb)87 static inline void tlb_flush_mmu(struct mmu_gather *tlb)
88 {
89 }
90 
__tlb_remove_page(struct mmu_gather * tlb,struct page * page)91 static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
92 {
93 	free_page_and_swap_cache(page);
94 	return 1; /* avoid calling tlb_flush_mmu */
95 }
96 
tlb_remove_page(struct mmu_gather * tlb,struct page * page)97 static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
98 {
99 	__tlb_remove_page(tlb, page);
100 }
101 
102 #define pte_free_tlb(tlb, ptep, addr)	pte_free((tlb)->mm, ptep)
103 #define pmd_free_tlb(tlb, pmdp, addr)	pmd_free((tlb)->mm, pmdp)
104 #define pud_free_tlb(tlb, pudp, addr)	pud_free((tlb)->mm, pudp)
105 
106 #define tlb_migrate_finish(mm)		do { } while (0)
107 
108 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64)
109 extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
110 extern void tlb_unwire_entry(void);
111 #else
tlb_wire_entry(struct vm_area_struct * vma,unsigned long addr,pte_t pte)112 static inline void tlb_wire_entry(struct vm_area_struct *vma ,
113 				  unsigned long addr, pte_t pte)
114 {
115 	BUG();
116 }
117 
tlb_unwire_entry(void)118 static inline void tlb_unwire_entry(void)
119 {
120 	BUG();
121 }
122 #endif
123 
124 #else /* CONFIG_MMU */
125 
126 #define tlb_start_vma(tlb, vma)				do { } while (0)
127 #define tlb_end_vma(tlb, vma)				do { } while (0)
128 #define __tlb_remove_tlb_entry(tlb, pte, address)	do { } while (0)
129 #define tlb_flush(tlb)					do { } while (0)
130 
131 #include <asm-generic/tlb.h>
132 
133 #endif /* CONFIG_MMU */
134 #endif /* __ASSEMBLY__ */
135 #endif /* __ASM_SH_TLB_H */
136