include/asm-s390/tlbflush.h

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