1 #ifndef _S390_TLBFLUSH_H
2 #define _S390_TLBFLUSH_H
5 #include <linux/sched.h>
6 #include <asm/processor.h>
7 #include <asm/pgalloc.h>
10 * Flush all TLB entries on the local CPU.
12 static inline void __tlb_flush_local(void)
14 asm volatile("ptlb" : : : "memory");
18 * Flush TLB entries for a specific ASCE on all CPUs
20 static inline void __tlb_flush_idte(unsigned long asce)
22 /* Global TLB flush for the mm */
24 " .insn rrf,0xb98e0000,0,%0,%1,0"
25 : : "a" (2048), "a" (asce) : "cc");
29 * Flush TLB entries for a specific ASCE on the local CPU
31 static inline void __tlb_flush_idte_local(unsigned long asce)
33 /* Local TLB flush for the mm */
35 " .insn rrf,0xb98e0000,0,%0,%1,1"
36 : : "a" (2048), "a" (asce) : "cc");
40 void smp_ptlb_all(void);
43 * Flush all TLB entries on all CPUs.
45 static inline void __tlb_flush_global(void)
47 register unsigned long reg2 asm("2");
48 register unsigned long reg3 asm("3");
49 register unsigned long reg4 asm("4");
54 reg4 = ((unsigned long) &dummy) + 1;
57 : : "d" (reg2), "d" (reg3), "d" (reg4), "m" (dummy) : "cc" );
61 * Flush TLB entries for a specific mm on all CPUs (in case gmap is used
62 * this implicates multiple ASCEs!).
64 static inline void __tlb_flush_full(struct mm_struct *mm)
67 atomic_add(0x10000, &mm->context.attach_count);
68 if (cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) {
72 /* Global TLB flush */
74 /* Reset TLB flush mask */
75 if (MACHINE_HAS_TLB_LC)
76 cpumask_copy(mm_cpumask(mm),
77 &mm->context.cpu_attach_mask);
79 atomic_sub(0x10000, &mm->context.attach_count);
84 * Flush TLB entries for a specific ASCE on all CPUs.
86 static inline void __tlb_flush_asce(struct mm_struct *mm, unsigned long asce)
91 active = (mm == current->active_mm) ? 1 : 0;
92 count = atomic_add_return(0x10000, &mm->context.attach_count);
93 if (MACHINE_HAS_TLB_LC && (count & 0xffff) <= active &&
94 cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) {
95 __tlb_flush_idte_local(asce);
98 __tlb_flush_idte(asce);
100 __tlb_flush_global();
101 /* Reset TLB flush mask */
102 if (MACHINE_HAS_TLB_LC)
103 cpumask_copy(mm_cpumask(mm),
104 &mm->context.cpu_attach_mask);
106 atomic_sub(0x10000, &mm->context.attach_count);
110 static inline void __tlb_flush_kernel(void)
112 if (MACHINE_HAS_IDTE)
113 __tlb_flush_idte(init_mm.context.asce);
115 __tlb_flush_global();
118 #define __tlb_flush_global() __tlb_flush_local()
119 #define __tlb_flush_full(mm) __tlb_flush_local()
122 * Flush TLB entries for a specific ASCE on all CPUs.
124 static inline void __tlb_flush_asce(struct mm_struct *mm, unsigned long asce)
126 if (MACHINE_HAS_TLB_LC)
127 __tlb_flush_idte_local(asce);
132 static inline void __tlb_flush_kernel(void)
134 if (MACHINE_HAS_TLB_LC)
135 __tlb_flush_idte_local(init_mm.context.asce);
141 static inline void __tlb_flush_mm(struct mm_struct * mm)
144 * If the machine has IDTE we prefer to do a per mm flush
145 * on all cpus instead of doing a local flush if the mm
146 * only ran on the local cpu.
148 if (MACHINE_HAS_IDTE && list_empty(&mm->context.gmap_list))
149 __tlb_flush_asce(mm, mm->context.asce);
151 __tlb_flush_full(mm);
154 static inline void __tlb_flush_mm_lazy(struct mm_struct * mm)
156 if (mm->context.flush_mm) {
158 mm->context.flush_mm = 0;
164 * flush_tlb() - flushes the current mm struct TLBs
165 * flush_tlb_all() - flushes all processes TLBs
166 * flush_tlb_mm(mm) - flushes the specified mm context TLB's
167 * flush_tlb_page(vma, vmaddr) - flushes one page
168 * flush_tlb_range(vma, start, end) - flushes a range of pages
169 * flush_tlb_kernel_range(start, end) - flushes a range of kernel pages
173 * flush_tlb_mm goes together with ptep_set_wrprotect for the
174 * copy_page_range operation and flush_tlb_range is related to
175 * ptep_get_and_clear for change_protection. ptep_set_wrprotect and
176 * ptep_get_and_clear do not flush the TLBs directly if the mm has
177 * only one user. At the end of the update the flush_tlb_mm and
178 * flush_tlb_range functions need to do the flush.
180 #define flush_tlb() do { } while (0)
181 #define flush_tlb_all() do { } while (0)
182 #define flush_tlb_page(vma, addr) do { } while (0)
184 static inline void flush_tlb_mm(struct mm_struct *mm)
186 __tlb_flush_mm_lazy(mm);
189 static inline void flush_tlb_range(struct vm_area_struct *vma,
190 unsigned long start, unsigned long end)
192 __tlb_flush_mm_lazy(vma->vm_mm);
195 static inline void flush_tlb_kernel_range(unsigned long start,
198 __tlb_flush_kernel();
201 #endif /* _S390_TLBFLUSH_H */