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1#ifndef _S390_TLBFLUSH_H
2#define _S390_TLBFLUSH_H
3
4#include <linux/mm.h>
5#include <linux/sched.h>
6#include <asm/processor.h>
7#include <asm/pgalloc.h>
8
9/*
10 * Flush all tlb entries on the local cpu.
11 */
12static inline void __tlb_flush_local(void)
13{
14 asm volatile("ptlb" : : : "memory");
15}
16
17#ifdef CONFIG_SMP
18/*
19 * Flush all tlb entries on all cpus.
20 */
21void smp_ptlb_all(void);
22
23static inline void __tlb_flush_global(void)
24{
25 register unsigned long reg2 asm("2");
26 register unsigned long reg3 asm("3");
27 register unsigned long reg4 asm("4");
28 long dummy;
29
30#ifndef __s390x__
31 if (!MACHINE_HAS_CSP) {
32 smp_ptlb_all();
33 return;
34 }
35#endif /* __s390x__ */
36
37 dummy = 0;
38 reg2 = reg3 = 0;
39 reg4 = ((unsigned long) &dummy) + 1;
40 asm volatile(
41 " csp %0,%2"
42 : : "d" (reg2), "d" (reg3), "d" (reg4), "m" (dummy) : "cc" );
43}
44
45static inline void __tlb_flush_full(struct mm_struct *mm)
46{
47 cpumask_t local_cpumask;
48
49 preempt_disable();
50 /*
51 * If the process only ran on the local cpu, do a local flush.
52 */
53 local_cpumask = cpumask_of_cpu(smp_processor_id());
54 if (cpumask_equal(mm_cpumask(mm), &local_cpumask))
55 __tlb_flush_local();
56 else
57 __tlb_flush_global();
58 preempt_enable();
59}
60#else
61#define __tlb_flush_full(mm) __tlb_flush_local()
62#endif
63
64/*
65 * Flush all tlb entries of a page table on all cpus.
66 */
67static inline void __tlb_flush_idte(unsigned long asce)
68{
69 asm volatile(
70 " .insn rrf,0xb98e0000,0,%0,%1,0"
71 : : "a" (2048), "a" (asce) : "cc" );
72}
73
74static inline void __tlb_flush_mm(struct mm_struct * mm)
75{
76 if (unlikely(cpumask_empty(mm_cpumask(mm))))
77 return;
78 /*
79 * If the machine has IDTE we prefer to do a per mm flush
80 * on all cpus instead of doing a local flush if the mm
81 * only ran on the local cpu.
82 */
83 if (MACHINE_HAS_IDTE) {
84 if (mm->context.noexec)
85 __tlb_flush_idte((unsigned long)
86 get_shadow_table(mm->pgd) |
87 mm->context.asce_bits);
88 __tlb_flush_idte((unsigned long) mm->pgd |
89 mm->context.asce_bits);
90 return;
91 }
92 __tlb_flush_full(mm);
93}
94
95static inline void __tlb_flush_mm_cond(struct mm_struct * mm)
96{
97 if (atomic_read(&mm->mm_users) <= 1 && mm == current->active_mm)
98 __tlb_flush_mm(mm);
99}
100
101/*
102 * TLB flushing:
103 * flush_tlb() - flushes the current mm struct TLBs
104 * flush_tlb_all() - flushes all processes TLBs
105 * flush_tlb_mm(mm) - flushes the specified mm context TLB's
106 * flush_tlb_page(vma, vmaddr) - flushes one page
107 * flush_tlb_range(vma, start, end) - flushes a range of pages
108 * flush_tlb_kernel_range(start, end) - flushes a range of kernel pages
109 */
110
111/*
112 * flush_tlb_mm goes together with ptep_set_wrprotect for the
113 * copy_page_range operation and flush_tlb_range is related to
114 * ptep_get_and_clear for change_protection. ptep_set_wrprotect and
115 * ptep_get_and_clear do not flush the TLBs directly if the mm has
116 * only one user. At the end of the update the flush_tlb_mm and
117 * flush_tlb_range functions need to do the flush.
118 */
119#define flush_tlb() do { } while (0)
120#define flush_tlb_all() do { } while (0)
121#define flush_tlb_page(vma, addr) do { } while (0)
122
123static inline void flush_tlb_mm(struct mm_struct *mm)
124{
125 __tlb_flush_mm_cond(mm);
126}
127
128static inline void flush_tlb_range(struct vm_area_struct *vma,
129 unsigned long start, unsigned long end)
130{
131 __tlb_flush_mm_cond(vma->vm_mm);
132}
133
134static inline void flush_tlb_kernel_range(unsigned long start,
135 unsigned long end)
136{
137 __tlb_flush_mm(&init_mm);
138}
139
140#endif /* _S390_TLBFLUSH_H */