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 */ 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 */ 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 */ 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 */ 45 static inline void __tlb_flush_mm(struct mm_struct *mm) 46 { 47 unsigned long gmap_asce; 48 49 preempt_disable(); 50 atomic_inc(&mm->context.flush_count); 51 /* Reset TLB flush mask */ 52 cpumask_copy(mm_cpumask(mm), &mm->context.cpu_attach_mask); 53 barrier(); 54 gmap_asce = READ_ONCE(mm->context.gmap_asce); 55 if (MACHINE_HAS_IDTE && gmap_asce != -1UL) { 56 if (gmap_asce) 57 __tlb_flush_idte(gmap_asce); 58 __tlb_flush_idte(mm->context.asce); 59 } else { 60 /* Global TLB flush */ 61 __tlb_flush_global(); 62 } 63 atomic_dec(&mm->context.flush_count); 64 preempt_enable(); 65 } 66 67 static inline void __tlb_flush_kernel(void) 68 { 69 if (MACHINE_HAS_IDTE) 70 __tlb_flush_idte(init_mm.context.asce); 71 else 72 __tlb_flush_global(); 73 } 74 75 static inline void __tlb_flush_mm_lazy(struct mm_struct * mm) 76 { 77 spin_lock(&mm->context.lock); 78 if (mm->context.flush_mm) { 79 mm->context.flush_mm = 0; 80 __tlb_flush_mm(mm); 81 } 82 spin_unlock(&mm->context.lock); 83 } 84 85 /* 86 * TLB flushing: 87 * flush_tlb() - flushes the current mm struct TLBs 88 * flush_tlb_all() - flushes all processes TLBs 89 * flush_tlb_mm(mm) - flushes the specified mm context TLB's 90 * flush_tlb_page(vma, vmaddr) - flushes one page 91 * flush_tlb_range(vma, start, end) - flushes a range of pages 92 * flush_tlb_kernel_range(start, end) - flushes a range of kernel pages 93 */ 94 95 /* 96 * flush_tlb_mm goes together with ptep_set_wrprotect for the 97 * copy_page_range operation and flush_tlb_range is related to 98 * ptep_get_and_clear for change_protection. ptep_set_wrprotect and 99 * ptep_get_and_clear do not flush the TLBs directly if the mm has 100 * only one user. At the end of the update the flush_tlb_mm and 101 * flush_tlb_range functions need to do the flush. 102 */ 103 #define flush_tlb() do { } while (0) 104 #define flush_tlb_all() do { } while (0) 105 #define flush_tlb_page(vma, addr) do { } while (0) 106 107 static inline void flush_tlb_mm(struct mm_struct *mm) 108 { 109 __tlb_flush_mm_lazy(mm); 110 } 111 112 static inline void flush_tlb_range(struct vm_area_struct *vma, 113 unsigned long start, unsigned long end) 114 { 115 __tlb_flush_mm_lazy(vma->vm_mm); 116 } 117 118 static inline void flush_tlb_kernel_range(unsigned long start, 119 unsigned long end) 120 { 121 __tlb_flush_kernel(); 122 } 123 124 #endif /* _S390_TLBFLUSH_H */ 125