1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _S390_TLBFLUSH_H
3 #define _S390_TLBFLUSH_H
6 #include <linux/sched.h>
7 #include <asm/processor.h>
8 #include <asm/pgalloc.h>
11 * Flush all TLB entries on the local CPU.
13 static inline void __tlb_flush_local(void)
15 asm volatile("ptlb" : : : "memory");
19 * Flush TLB entries for a specific ASCE on all CPUs
21 static inline void __tlb_flush_idte(unsigned long asce)
26 if (MACHINE_HAS_TLB_GUEST)
27 opt |= IDTE_GUEST_ASCE;
28 /* Global TLB flush for the mm */
30 " .insn rrf,0xb98e0000,0,%0,%1,0"
31 : : "a" (opt), "a" (asce) : "cc");
34 void smp_ptlb_all(void);
37 * Flush all TLB entries on all CPUs.
39 static inline void __tlb_flush_global(void)
41 unsigned int dummy = 0;
47 * Flush TLB entries for a specific mm on all CPUs (in case gmap is used
48 * this implicates multiple ASCEs!).
50 static inline void __tlb_flush_mm(struct mm_struct *mm)
52 unsigned long gmap_asce;
55 * If the machine has IDTE we prefer to do a per mm flush
56 * on all cpus instead of doing a local flush if the mm
57 * only ran on the local cpu.
60 atomic_inc(&mm->context.flush_count);
61 /* Reset TLB flush mask */
62 cpumask_copy(mm_cpumask(mm), &mm->context.cpu_attach_mask);
64 gmap_asce = READ_ONCE(mm->context.gmap_asce);
65 if (MACHINE_HAS_IDTE && gmap_asce != -1UL) {
67 __tlb_flush_idte(gmap_asce);
68 __tlb_flush_idte(mm->context.asce);
70 /* Global TLB flush */
73 atomic_dec(&mm->context.flush_count);
77 static inline void __tlb_flush_kernel(void)
80 __tlb_flush_idte(init_mm.context.asce);
85 static inline void __tlb_flush_mm_lazy(struct mm_struct * mm)
87 spin_lock(&mm->context.lock);
88 if (mm->context.flush_mm) {
89 mm->context.flush_mm = 0;
92 spin_unlock(&mm->context.lock);
97 * flush_tlb() - flushes the current mm struct TLBs
98 * flush_tlb_all() - flushes all processes TLBs
99 * flush_tlb_mm(mm) - flushes the specified mm context TLB's
100 * flush_tlb_page(vma, vmaddr) - flushes one page
101 * flush_tlb_range(vma, start, end) - flushes a range of pages
102 * flush_tlb_kernel_range(start, end) - flushes a range of kernel pages
106 * flush_tlb_mm goes together with ptep_set_wrprotect for the
107 * copy_page_range operation and flush_tlb_range is related to
108 * ptep_get_and_clear for change_protection. ptep_set_wrprotect and
109 * ptep_get_and_clear do not flush the TLBs directly if the mm has
110 * only one user. At the end of the update the flush_tlb_mm and
111 * flush_tlb_range functions need to do the flush.
113 #define flush_tlb() do { } while (0)
114 #define flush_tlb_all() do { } while (0)
115 #define flush_tlb_page(vma, addr) do { } while (0)
117 static inline void flush_tlb_mm(struct mm_struct *mm)
119 __tlb_flush_mm_lazy(mm);
122 static inline void flush_tlb_range(struct vm_area_struct *vma,
123 unsigned long start, unsigned long end)
125 __tlb_flush_mm_lazy(vma->vm_mm);
128 static inline void flush_tlb_kernel_range(unsigned long start,
131 __tlb_flush_kernel();
134 #endif /* _S390_TLBFLUSH_H */