1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
#ifndef _S390_TLBFLUSH_H
#define _S390_TLBFLUSH_H
#include <linux/mm.h>
#include <asm/processor.h>
#include <asm/pgalloc.h>
/*
* TLB flushing:
*
* - flush_tlb() flushes the current mm struct TLBs
* - flush_tlb_all() flushes all processes TLBs
* - flush_tlb_mm(mm) flushes the specified mm context TLB's
* - flush_tlb_page(vma, vmaddr) flushes one page
* - flush_tlb_range(vma, start, end) flushes a range of pages
* - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
* - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
*/
/*
* S/390 has three ways of flushing TLBs
* 'ptlb' does a flush of the local processor
* 'csp' flushes the TLBs on all PUs of a SMP
* 'ipte' invalidates a pte in a page table and flushes that out of
* the TLBs of all PUs of a SMP
*/
#define local_flush_tlb() \
do { asm volatile("ptlb": : :"memory"); } while (0)
#ifndef CONFIG_SMP
/*
* We always need to flush, since s390 does not flush tlb
* on each context switch
*/
static inline void flush_tlb(void)
{
local_flush_tlb();
}
static inline void flush_tlb_all(void)
{
local_flush_tlb();
}
static inline void flush_tlb_mm(struct mm_struct *mm)
{
local_flush_tlb();
}
static inline void flush_tlb_page(struct vm_area_struct *vma,
unsigned long addr)
{
local_flush_tlb();
}
static inline void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
local_flush_tlb();
}
#define flush_tlb_kernel_range(start, end) \
local_flush_tlb();
#else
#include <asm/smp.h>
extern void smp_ptlb_all(void);
static inline void global_flush_tlb(void)
{
register unsigned long reg2 asm("2");
register unsigned long reg3 asm("3");
register unsigned long reg4 asm("4");
long dummy;
#ifndef __s390x__
if (!MACHINE_HAS_CSP) {
smp_ptlb_all();
return;
}
#endif /* __s390x__ */
dummy = 0;
reg2 = reg3 = 0;
reg4 = ((unsigned long) &dummy) + 1;
asm volatile(
" csp %0,%2"
: : "d" (reg2), "d" (reg3), "d" (reg4), "m" (dummy) : "cc" );
}
/*
* We only have to do global flush of tlb if process run since last
* flush on any other pu than current.
* If we have threads (mm->count > 1) we always do a global flush,
* since the process runs on more than one processor at the same time.
*/
static inline void __flush_tlb_mm(struct mm_struct * mm)
{
cpumask_t local_cpumask;
if (unlikely(cpus_empty(mm->cpu_vm_mask)))
return;
if (MACHINE_HAS_IDTE) {
pgd_t *shadow_pgd = get_shadow_pgd(mm->pgd);
if (shadow_pgd) {
asm volatile(
" .insn rrf,0xb98e0000,0,%0,%1,0"
: : "a" (2048),
"a" (__pa(shadow_pgd) & PAGE_MASK) : "cc" );
}
asm volatile(
" .insn rrf,0xb98e0000,0,%0,%1,0"
: : "a" (2048), "a" (__pa(mm->pgd)&PAGE_MASK) : "cc");
return;
}
preempt_disable();
local_cpumask = cpumask_of_cpu(smp_processor_id());
if (cpus_equal(mm->cpu_vm_mask, local_cpumask))
local_flush_tlb();
else
global_flush_tlb();
preempt_enable();
}
static inline void flush_tlb(void)
{
__flush_tlb_mm(current->mm);
}
static inline void flush_tlb_all(void)
{
global_flush_tlb();
}
static inline void flush_tlb_mm(struct mm_struct *mm)
{
__flush_tlb_mm(mm);
}
static inline void flush_tlb_page(struct vm_area_struct *vma,
unsigned long addr)
{
__flush_tlb_mm(vma->vm_mm);
}
static inline void flush_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
__flush_tlb_mm(vma->vm_mm);
}
#define flush_tlb_kernel_range(start, end) global_flush_tlb()
#endif
static inline void flush_tlb_pgtables(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
/* S/390 does not keep any page table caches in TLB */
}
#endif /* _S390_TLBFLUSH_H */
|
