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 #endif
  63
  64 /*
  65  * Flush all tlb entries of a page table on all cpus.
  66  */
  67 static 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
  74 static 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 && list_empty(&mm->context.gmap_list))
  84                 __tlb_flush_idte((unsigned long) mm->pgd |
  85                                  mm->context.asce_bits);
  86         else
  87                 __tlb_flush_full(mm);
  88 }
  89
  90 static inline void __tlb_flush_mm_cond(struct mm_struct * mm)
  91 {
  92         spin_lock(&mm->page_table_lock);
  93         if (mm->context.flush_mm) {
  94                 __tlb_flush_mm(mm);
  95                 mm->context.flush_mm = 0;
  96         }
  97         spin_unlock(&mm->page_table_lock);
  98 }
  99
 100 /*
 101  * TLB flushing:
 102  *  flush_tlb() - flushes the current mm struct TLBs
 103  *  flush_tlb_all() - flushes all processes TLBs
 104  *  flush_tlb_mm(mm) - flushes the specified mm context TLB's
 105  *  flush_tlb_page(vma, vmaddr) - flushes one page
 106  *  flush_tlb_range(vma, start, end) - flushes a range of pages
 107  *  flush_tlb_kernel_range(start, end) - flushes a range of kernel pages
 108  */
 109
 110 /*
 111  * flush_tlb_mm goes together with ptep_set_wrprotect for the
 112  * copy_page_range operation and flush_tlb_range is related to
 113  * ptep_get_and_clear for change_protection. ptep_set_wrprotect and
 114  * ptep_get_and_clear do not flush the TLBs directly if the mm has
 115  * only one user. At the end of the update the flush_tlb_mm and
 116  * flush_tlb_range functions need to do the flush.
 117  */
 118 #define flush_tlb()                             do { } while (0)
 119 #define flush_tlb_all()                         do { } while (0)
 120 #define flush_tlb_page(vma, addr)               do { } while (0)
 121
 122 static inline void flush_tlb_mm(struct mm_struct *mm)
 123 {
 124         __tlb_flush_mm_cond(mm);
 125 }
 126
 127 static inline void flush_tlb_range(struct vm_area_struct *vma,
 128                                    unsigned long start, unsigned long end)
 129 {
 130         __tlb_flush_mm_cond(vma->vm_mm);
 131 }
 132
 133 static inline void flush_tlb_kernel_range(unsigned long start,
 134                                           unsigned long end)
 135 {
 136         __tlb_flush_mm(&init_mm);
 137 }
 138
 139 #endif /* _S390_TLBFLUSH_H */