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