fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-s390 / tlbflush.h
blob66793f55c8b2dea7b61f8a7aeada359e252afa22
1 #ifndef _S390_TLBFLUSH_H
2 #define _S390_TLBFLUSH_H
4 #include <linux/mm.h>
5 #include <asm/processor.h>
6 #include <asm/pgalloc.h>
8 /*
9 * TLB flushing:
11 * - flush_tlb() flushes the current mm struct TLBs
12 * - flush_tlb_all() flushes all processes TLBs
13 * - flush_tlb_mm(mm) flushes the specified mm context TLB's
14 * - flush_tlb_page(vma, vmaddr) flushes one page
15 * - flush_tlb_range(vma, start, end) flushes a range of pages
16 * - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
17 * - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
21 * S/390 has three ways of flushing TLBs
22 * 'ptlb' does a flush of the local processor
23 * 'csp' flushes the TLBs on all PUs of a SMP
24 * 'ipte' invalidates a pte in a page table and flushes that out of
25 * the TLBs of all PUs of a SMP
28 #define local_flush_tlb() \
29 do { asm volatile("ptlb": : :"memory"); } while (0)
31 #ifndef CONFIG_SMP
34 * We always need to flush, since s390 does not flush tlb
35 * on each context switch
38 static inline void flush_tlb(void)
40 local_flush_tlb();
42 static inline void flush_tlb_all(void)
44 local_flush_tlb();
46 static inline void flush_tlb_mm(struct mm_struct *mm)
48 local_flush_tlb();
50 static inline void flush_tlb_page(struct vm_area_struct *vma,
51 unsigned long addr)
53 local_flush_tlb();
55 static inline void flush_tlb_range(struct vm_area_struct *vma,
56 unsigned long start, unsigned long end)
58 local_flush_tlb();
61 #define flush_tlb_kernel_range(start, end) \
62 local_flush_tlb();
64 #else
66 #include <asm/smp.h>
68 extern void smp_ptlb_all(void);
70 static inline void global_flush_tlb(void)
72 register unsigned long reg2 asm("2");
73 register unsigned long reg3 asm("3");
74 register unsigned long reg4 asm("4");
75 long dummy;
77 #ifndef __s390x__
78 if (!MACHINE_HAS_CSP) {
79 smp_ptlb_all();
80 return;
82 #endif /* __s390x__ */
84 dummy = 0;
85 reg2 = reg3 = 0;
86 reg4 = ((unsigned long) &dummy) + 1;
87 asm volatile(
88 " csp %0,%2"
89 : : "d" (reg2), "d" (reg3), "d" (reg4), "m" (dummy) : "cc" );
93 * We only have to do global flush of tlb if process run since last
94 * flush on any other pu than current.
95 * If we have threads (mm->count > 1) we always do a global flush,
96 * since the process runs on more than one processor at the same time.
99 static inline void __flush_tlb_mm(struct mm_struct * mm)
101 cpumask_t local_cpumask;
103 if (unlikely(cpus_empty(mm->cpu_vm_mask)))
104 return;
105 if (MACHINE_HAS_IDTE) {
106 pgd_t *shadow_pgd = get_shadow_pgd(mm->pgd);
108 if (shadow_pgd) {
109 asm volatile(
110 " .insn rrf,0xb98e0000,0,%0,%1,0"
111 : : "a" (2048),
112 "a" (__pa(shadow_pgd) & PAGE_MASK) : "cc" );
114 asm volatile(
115 " .insn rrf,0xb98e0000,0,%0,%1,0"
116 : : "a" (2048), "a" (__pa(mm->pgd)&PAGE_MASK) : "cc");
117 return;
119 preempt_disable();
120 local_cpumask = cpumask_of_cpu(smp_processor_id());
121 if (cpus_equal(mm->cpu_vm_mask, local_cpumask))
122 local_flush_tlb();
123 else
124 global_flush_tlb();
125 preempt_enable();
128 static inline void flush_tlb(void)
130 __flush_tlb_mm(current->mm);
132 static inline void flush_tlb_all(void)
134 global_flush_tlb();
136 static inline void flush_tlb_mm(struct mm_struct *mm)
138 __flush_tlb_mm(mm);
140 static inline void flush_tlb_page(struct vm_area_struct *vma,
141 unsigned long addr)
143 __flush_tlb_mm(vma->vm_mm);
145 static inline void flush_tlb_range(struct vm_area_struct *vma,
146 unsigned long start, unsigned long end)
148 __flush_tlb_mm(vma->vm_mm);
151 #define flush_tlb_kernel_range(start, end) global_flush_tlb()
153 #endif
155 static inline void flush_tlb_pgtables(struct mm_struct *mm,
156 unsigned long start, unsigned long end)
158 /* S/390 does not keep any page table caches in TLB */
161 #endif /* _S390_TLBFLUSH_H */