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 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 #ifdef CONFIG_SMP 18 /* 19 * Flush all tlb entries on all cpus. 20 */ 21 void smp_ptlb_all(void); 22 23 static inline void __tlb_flush_global(void) 24 { 25 register unsigned long reg2 asm("2"); 26 register unsigned long reg3 asm("3"); 27 register unsigned long reg4 asm("4"); 28 long dummy; 29 30 #ifndef __s390x__ 31 if (!MACHINE_HAS_CSP) { 32 smp_ptlb_all(); 33 return; 34 } 35 #endif /* __s390x__ */ 36 37 dummy = 0; 38 reg2 = reg3 = 0; 39 reg4 = ((unsigned long) &dummy) + 1; 40 asm volatile( 41 " csp %0,%2" 42 : : "d" (reg2), "d" (reg3), "d" (reg4), "m" (dummy) : "cc" ); 43 } 44 45 static inline void __tlb_flush_full(struct mm_struct *mm) 46 { 47 cpumask_t local_cpumask; 48 49 preempt_disable(); 50 /* 51 * If the process only ran on the local cpu, do a local flush. 52 */ 53 cpumask_copy(&local_cpumask, cpumask_of(smp_processor_id())); 54 if (cpumask_equal(mm_cpumask(mm), &local_cpumask)) 55 __tlb_flush_local(); 56 else 57 __tlb_flush_global(); 58 preempt_enable(); 59 } 60 #else 61 #define __tlb_flush_full(mm) __tlb_flush_local() 62 #endif 63 64 /* 65 * Flush all tlb entries of a page table on all cpus. 66 */ 67 static inline void __tlb_flush_idte(unsigned long asce) 68 { 69 asm volatile( 70 " .insn rrf,0xb98e0000,0,%0,%1,0" 71 : : "a" (2048), "a" (asce) : "cc" ); 72 } 73 74 static inline void __tlb_flush_mm(struct mm_struct * mm) 75 { 76 if (unlikely(cpumask_empty(mm_cpumask(mm)))) 77 return; 78 /* 79 * If the machine has IDTE we prefer to do a per mm flush 80 * on all cpus instead of doing a local flush if the mm 81 * only ran on the local cpu. 82 */ 83 if (MACHINE_HAS_IDTE) 84 __tlb_flush_idte((unsigned long) mm->pgd | 85 mm->context.asce_bits); 86 else 87 __tlb_flush_full(mm); 88 } 89 90 static inline void __tlb_flush_mm_cond(struct mm_struct * mm) 91 { 92 spin_lock(&mm->page_table_lock); 93 if (mm->context.flush_mm) { 94 __tlb_flush_mm(mm); 95 mm->context.flush_mm = 0; 96 } 97 spin_unlock(&mm->page_table_lock); 98 } 99 100 /* 101 * TLB flushing: 102 * flush_tlb() - flushes the current mm struct TLBs 103 * flush_tlb_all() - flushes all processes TLBs 104 * flush_tlb_mm(mm) - flushes the specified mm context TLB's 105 * flush_tlb_page(vma, vmaddr) - flushes one page 106 * flush_tlb_range(vma, start, end) - flushes a range of pages 107 * flush_tlb_kernel_range(start, end) - flushes a range of kernel pages 108 */ 109 110 /* 111 * flush_tlb_mm goes together with ptep_set_wrprotect for the 112 * copy_page_range operation and flush_tlb_range is related to 113 * ptep_get_and_clear for change_protection. ptep_set_wrprotect and 114 * ptep_get_and_clear do not flush the TLBs directly if the mm has 115 * only one user. At the end of the update the flush_tlb_mm and 116 * flush_tlb_range functions need to do the flush. 117 */ 118 #define flush_tlb() do { } while (0) 119 #define flush_tlb_all() do { } while (0) 120 #define flush_tlb_page(vma, addr) do { } while (0) 121 122 static inline void flush_tlb_mm(struct mm_struct *mm) 123 { 124 __tlb_flush_mm_cond(mm); 125 } 126 127 static inline void flush_tlb_range(struct vm_area_struct *vma, 128 unsigned long start, unsigned long end) 129 { 130 __tlb_flush_mm_cond(vma->vm_mm); 131 } 132 133 static inline void flush_tlb_kernel_range(unsigned long start, 134 unsigned long end) 135 { 136 __tlb_flush_mm(&init_mm); 137 } 138 139 #endif /* _S390_TLBFLUSH_H */ 140