arch/s390/include/asm/tlbflush.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _S390_TLBFLUSH_H
   3 #define _S390_TLBFLUSH_H
   4
   5 #include <linux/mm.h>
   6 #include <linux/sched.h>
   7 #include <asm/processor.h>
   8 #include <asm/pgalloc.h>
   9 #include <asm/pgtable.h>
  10
  11 /*
  12  * Flush all TLB entries on the local CPU.
  13  */
  14 static inline void __tlb_flush_local(void)
  15 {
  16         asm volatile("ptlb" : : : "memory");
  17 }
  18
  19 /*
  20  * Flush TLB entries for a specific ASCE on all CPUs
  21  */
  22 static inline void __tlb_flush_idte(unsigned long asce)
  23 {
  24         unsigned long opt;
  25
  26         opt = IDTE_PTOA;
  27         if (MACHINE_HAS_TLB_GUEST)
  28                 opt |= IDTE_GUEST_ASCE;
  29         /* Global TLB flush for the mm */
  30         asm volatile(
  31                 "       .insn   rrf,0xb98e0000,0,%0,%1,0"
  32                 : : "a" (opt), "a" (asce) : "cc");
  33 }
  34
  35 #ifdef CONFIG_SMP
  36 void smp_ptlb_all(void);
  37
  38 /*
  39  * Flush all TLB entries on all CPUs.
  40  */
  41 static inline void __tlb_flush_global(void)
  42 {
  43         unsigned int dummy = 0;
  44
  45         csp(&dummy, 0, 0);
  46 }
  47
  48 /*
  49  * Flush TLB entries for a specific mm on all CPUs (in case gmap is used
  50  * this implicates multiple ASCEs!).
  51  */
  52 static inline void __tlb_flush_mm(struct mm_struct *mm)
  53 {
  54         unsigned long gmap_asce;
  55
  56         /*
  57          * If the machine has IDTE we prefer to do a per mm flush
  58          * on all cpus instead of doing a local flush if the mm
  59          * only ran on the local cpu.
  60          */
  61         preempt_disable();
  62         atomic_inc(&mm->context.flush_count);
  63         /* Reset TLB flush mask */
  64         cpumask_copy(mm_cpumask(mm), &mm->context.cpu_attach_mask);
  65         barrier();
  66         gmap_asce = READ_ONCE(mm->context.gmap_asce);
  67         if (MACHINE_HAS_IDTE && gmap_asce != -1UL) {
  68                 if (gmap_asce)
  69                         __tlb_flush_idte(gmap_asce);
  70                 __tlb_flush_idte(mm->context.asce);
  71         } else {
  72                 /* Global TLB flush */
  73                 __tlb_flush_global();
  74         }
  75         atomic_dec(&mm->context.flush_count);
  76         preempt_enable();
  77 }
  78
  79 static inline void __tlb_flush_kernel(void)
  80 {
  81         if (MACHINE_HAS_IDTE)
  82                 __tlb_flush_idte(init_mm.context.asce);
  83         else
  84                 __tlb_flush_global();
  85 }
  86 #else
  87 #define __tlb_flush_global()    __tlb_flush_local()
  88
  89 /*
  90  * Flush TLB entries for a specific ASCE on all CPUs.
  91  */
  92 static inline void __tlb_flush_mm(struct mm_struct *mm)
  93 {
  94         __tlb_flush_local();
  95 }
  96
  97 static inline void __tlb_flush_kernel(void)
  98 {
  99         __tlb_flush_local();
 100 }
 101 #endif
 102
 103 static inline void __tlb_flush_mm_lazy(struct mm_struct * mm)
 104 {
 105         spin_lock(&mm->context.lock);
 106         if (mm->context.flush_mm) {
 107                 mm->context.flush_mm = 0;
 108                 __tlb_flush_mm(mm);
 109         }
 110         spin_unlock(&mm->context.lock);
 111 }
 112
 113 /*
 114  * TLB flushing:
 115  *  flush_tlb() - flushes the current mm struct TLBs
 116  *  flush_tlb_all() - flushes all processes TLBs
 117  *  flush_tlb_mm(mm) - flushes the specified mm context TLB's
 118  *  flush_tlb_page(vma, vmaddr) - flushes one page
 119  *  flush_tlb_range(vma, start, end) - flushes a range of pages
 120  *  flush_tlb_kernel_range(start, end) - flushes a range of kernel pages
 121  */
 122
 123 /*
 124  * flush_tlb_mm goes together with ptep_set_wrprotect for the
 125  * copy_page_range operation and flush_tlb_range is related to
 126  * ptep_get_and_clear for change_protection. ptep_set_wrprotect and
 127  * ptep_get_and_clear do not flush the TLBs directly if the mm has
 128  * only one user. At the end of the update the flush_tlb_mm and
 129  * flush_tlb_range functions need to do the flush.
 130  */
 131 #define flush_tlb()                             do { } while (0)
 132 #define flush_tlb_all()                         do { } while (0)
 133 #define flush_tlb_page(vma, addr)               do { } while (0)
 134
 135 static inline void flush_tlb_mm(struct mm_struct *mm)
 136 {
 137         __tlb_flush_mm_lazy(mm);
 138 }
 139
 140 static inline void flush_tlb_range(struct vm_area_struct *vma,
 141                                    unsigned long start, unsigned long end)
 142 {
 143         __tlb_flush_mm_lazy(vma->vm_mm);
 144 }
 145
 146 static inline void flush_tlb_kernel_range(unsigned long start,
 147                                           unsigned long end)
 148 {
 149         __tlb_flush_kernel();
 150 }
 151
 152 #endif /* _S390_TLBFLUSH_H */