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 #include <asm/pgalloc.h>
   7
   8 /*
   9  * Flush all tlb entries on the local cpu.
  10  */
  11 static inline void __tlb_flush_local(void)
  12 {
  13         asm volatile("ptlb" : : : "memory");
  14 }
  15
  16 #ifdef CONFIG_SMP
  17 /*
  18  * Flush all tlb entries on all cpus.
  19  */
  20 void smp_ptlb_all(void);
  21
  22 static inline void __tlb_flush_global(void)
  23 {
  24         register unsigned long reg2 asm("2");
  25         register unsigned long reg3 asm("3");
  26         register unsigned long reg4 asm("4");
  27         long dummy;
  28
  29 #ifndef __s390x__
  30         if (!MACHINE_HAS_CSP) {
  31                 smp_ptlb_all();
  32                 return;
  33         }
  34 #endif /* __s390x__ */
  35
  36         dummy = 0;
  37         reg2 = reg3 = 0;
  38         reg4 = ((unsigned long) &dummy) + 1;
  39         asm volatile(
  40                 "       csp     %0,%2"
  41                 : : "d" (reg2), "d" (reg3), "d" (reg4), "m" (dummy) : "cc" );
  42 }
  43
  44 static inline void __tlb_flush_full(struct mm_struct *mm)
  45 {
  46         cpumask_t local_cpumask;
  47
  48         preempt_disable();
  49         /*
  50          * If the process only ran on the local cpu, do a local flush.
  51          */
  52         local_cpumask = cpumask_of_cpu(smp_processor_id());
  53         if (cpus_equal(mm->cpu_vm_mask, local_cpumask))
  54                 __tlb_flush_local();
  55         else
  56                 __tlb_flush_global();
  57         preempt_enable();
  58 }
  59 #else
  60 #define __tlb_flush_full(mm)    __tlb_flush_local()
  61 #endif
  62
  63 /*
  64  * Flush all tlb entries of a page table on all cpus.
  65  */
  66 static inline void __tlb_flush_idte(unsigned long asce)
  67 {
  68         asm volatile(
  69                 "       .insn   rrf,0xb98e0000,0,%0,%1,0"
  70                 : : "a" (2048), "a" (asce) : "cc" );
  71 }
  72
  73 static inline void __tlb_flush_mm(struct mm_struct * mm)
  74 {
  75         if (unlikely(cpus_empty(mm->cpu_vm_mask)))
  76                 return;
  77         /*
  78          * If the machine has IDTE we prefer to do a per mm flush
  79          * on all cpus instead of doing a local flush if the mm
  80          * only ran on the local cpu.
  81          */
  82         if (MACHINE_HAS_IDTE) {
  83                 if (mm->context.noexec)
  84                         __tlb_flush_idte((unsigned long)
  85                                          get_shadow_table(mm->pgd) |
  86                                          mm->context.asce_bits);
  87                 __tlb_flush_idte((unsigned long) mm->pgd |
  88                                  mm->context.asce_bits);
  89                 return;
  90         }
  91         __tlb_flush_full(mm);
  92 }
  93
  94 static inline void __tlb_flush_mm_cond(struct mm_struct * mm)
  95 {
  96         if (atomic_read(&mm->mm_users) <= 1 && mm == current->active_mm)
  97                 __tlb_flush_mm(mm);
  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 */