1 #ifndef _S390_TLBFLUSH_H 2 #define _S390_TLBFLUSH_H 3 4 #include <linux/mm.h> 5 #include <linux/sched.h> 6 #include <asm/processor.h> 7 #include <asm/pgalloc.h> 8 #include <asm/pgtable.h> 9 10 /* 11 * Flush all TLB entries on the local CPU. 12 */ 13 static inline void __tlb_flush_local(void) 14 { 15 asm volatile("ptlb" : : : "memory"); 16 } 17 18 /* 19 * Flush TLB entries for a specific ASCE on all CPUs 20 */ 21 static inline void __tlb_flush_idte(unsigned long asce) 22 { 23 unsigned long opt; 24 25 opt = IDTE_PTOA; 26 if (MACHINE_HAS_TLB_GUEST) 27 opt |= IDTE_GUEST_ASCE; 28 /* Global TLB flush for the mm */ 29 asm volatile( 30 " .insn rrf,0xb98e0000,0,%0,%1,0" 31 : : "a" (opt), "a" (asce) : "cc"); 32 } 33 34 #ifdef CONFIG_SMP 35 void smp_ptlb_all(void); 36 37 /* 38 * Flush all TLB entries on all CPUs. 39 */ 40 static inline void __tlb_flush_global(void) 41 { 42 unsigned int dummy = 0; 43 44 csp(&dummy, 0, 0); 45 } 46 47 /* 48 * Flush TLB entries for a specific mm on all CPUs (in case gmap is used 49 * this implicates multiple ASCEs!). 50 */ 51 static inline void __tlb_flush_full(struct mm_struct *mm) 52 { 53 preempt_disable(); 54 atomic_inc(&mm->context.flush_count); 55 if (cpumask_equal(mm_cpumask(mm), cpumask_of(smp_processor_id()))) { 56 /* Local TLB flush */ 57 __tlb_flush_local(); 58 } else { 59 /* Global TLB flush */ 60 __tlb_flush_global(); 61 /* Reset TLB flush mask */ 62 cpumask_copy(mm_cpumask(mm), &mm->context.cpu_attach_mask); 63 } 64 atomic_dec(&mm->context.flush_count); 65 preempt_enable(); 66 } 67 68 static inline void __tlb_flush_mm(struct mm_struct *mm) 69 { 70 unsigned long gmap_asce; 71 72 /* 73 * If the machine has IDTE we prefer to do a per mm flush 74 * on all cpus instead of doing a local flush if the mm 75 * only ran on the local cpu. 76 */ 77 preempt_disable(); 78 atomic_inc(&mm->context.flush_count); 79 gmap_asce = READ_ONCE(mm->context.gmap_asce); 80 if (MACHINE_HAS_IDTE && gmap_asce != -1UL) { 81 if (gmap_asce) 82 __tlb_flush_idte(gmap_asce); 83 __tlb_flush_idte(mm->context.asce); 84 } else { 85 __tlb_flush_full(mm); 86 } 87 /* Reset TLB flush mask */ 88 cpumask_copy(mm_cpumask(mm), &mm->context.cpu_attach_mask); 89 atomic_dec(&mm->context.flush_count); 90 preempt_enable(); 91 } 92 93 static inline void __tlb_flush_kernel(void) 94 { 95 if (MACHINE_HAS_IDTE) 96 __tlb_flush_idte(init_mm.context.asce); 97 else 98 __tlb_flush_global(); 99 } 100 #else 101 #define __tlb_flush_global() __tlb_flush_local() 102 #define __tlb_flush_full(mm) __tlb_flush_local() 103 104 /* 105 * Flush TLB entries for a specific ASCE on all CPUs. 106 */ 107 static inline void __tlb_flush_mm(struct mm_struct *mm) 108 { 109 __tlb_flush_local(); 110 } 111 112 static inline void __tlb_flush_kernel(void) 113 { 114 __tlb_flush_local(); 115 } 116 #endif 117 118 static inline void __tlb_flush_mm_lazy(struct mm_struct * mm) 119 { 120 if (mm->context.flush_mm) { 121 __tlb_flush_mm(mm); 122 mm->context.flush_mm = 0; 123 } 124 } 125 126 /* 127 * TLB flushing: 128 * flush_tlb() - flushes the current mm struct TLBs 129 * flush_tlb_all() - flushes all processes TLBs 130 * flush_tlb_mm(mm) - flushes the specified mm context TLB's 131 * flush_tlb_page(vma, vmaddr) - flushes one page 132 * flush_tlb_range(vma, start, end) - flushes a range of pages 133 * flush_tlb_kernel_range(start, end) - flushes a range of kernel pages 134 */ 135 136 /* 137 * flush_tlb_mm goes together with ptep_set_wrprotect for the 138 * copy_page_range operation and flush_tlb_range is related to 139 * ptep_get_and_clear for change_protection. ptep_set_wrprotect and 140 * ptep_get_and_clear do not flush the TLBs directly if the mm has 141 * only one user. At the end of the update the flush_tlb_mm and 142 * flush_tlb_range functions need to do the flush. 143 */ 144 #define flush_tlb() do { } while (0) 145 #define flush_tlb_all() do { } while (0) 146 #define flush_tlb_page(vma, addr) do { } while (0) 147 148 static inline void flush_tlb_mm(struct mm_struct *mm) 149 { 150 __tlb_flush_mm_lazy(mm); 151 } 152 153 static inline void flush_tlb_range(struct vm_area_struct *vma, 154 unsigned long start, unsigned long end) 155 { 156 __tlb_flush_mm_lazy(vma->vm_mm); 157 } 158 159 static inline void flush_tlb_kernel_range(unsigned long start, 160 unsigned long end) 161 { 162 __tlb_flush_kernel(); 163 } 164 165 #endif /* _S390_TLBFLUSH_H */ 166