arch/s390/include/asm/tlbflush.h

   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  */
  12 static 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  */
  21 void smp_ptlb_all(void);
  22
  23 static 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
  45 static 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         cpumask_copy(&local_cpumask, cpumask_of(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 #define __tlb_flush_global()    __tlb_flush_local()
  63 #endif
  64
  65 /*
  66  * Flush all tlb entries of a page table on all cpus.
  67  */
  68 static inline void __tlb_flush_idte(unsigned long asce)
  69 {
  70         asm volatile(
  71                 "       .insn   rrf,0xb98e0000,0,%0,%1,0"
  72                 : : "a" (2048), "a" (asce) : "cc" );
  73 }
  74
  75 static inline void __tlb_flush_mm(struct mm_struct * mm)
  76 {
  77         if (unlikely(cpumask_empty(mm_cpumask(mm))))
  78                 return;
  79         /*
  80          * If the machine has IDTE we prefer to do a per mm flush
  81          * on all cpus instead of doing a local flush if the mm
  82          * only ran on the local cpu.
  83          */
  84         if (MACHINE_HAS_IDTE && list_empty(&mm->context.gmap_list))
  85                 __tlb_flush_idte((unsigned long) mm->pgd |
  86                                  mm->context.asce_bits);
  87         else
  88                 __tlb_flush_full(mm);
  89 }
  90
  91 static inline void __tlb_flush_mm_cond(struct mm_struct * mm)
  92 {
  93         spin_lock(&mm->page_table_lock);
  94         if (mm->context.flush_mm) {
  95                 __tlb_flush_mm(mm);
  96                 mm->context.flush_mm = 0;
  97         }
  98         spin_unlock(&mm->page_table_lock);
  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
 123 static inline void flush_tlb_mm(struct mm_struct *mm)
 124 {
 125         __tlb_flush_mm_cond(mm);
 126 }
 127
 128 static 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
 134 static 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 */