Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _S390_TLBFLUSH_H |
| 2 | #define _S390_TLBFLUSH_H |
| 3 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | #include <linux/mm.h> |
| 5 | #include <asm/processor.h> |
| 6 | |
| 7 | /* |
| 8 | * TLB flushing: |
| 9 | * |
| 10 | * - flush_tlb() flushes the current mm struct TLBs |
| 11 | * - flush_tlb_all() flushes all processes TLBs |
| 12 | * - flush_tlb_mm(mm) flushes the specified mm context TLB's |
| 13 | * - flush_tlb_page(vma, vmaddr) flushes one page |
| 14 | * - flush_tlb_range(vma, start, end) flushes a range of pages |
| 15 | * - flush_tlb_kernel_range(start, end) flushes a range of kernel pages |
| 16 | * - flush_tlb_pgtables(mm, start, end) flushes a range of page tables |
| 17 | */ |
| 18 | |
| 19 | /* |
| 20 | * S/390 has three ways of flushing TLBs |
| 21 | * 'ptlb' does a flush of the local processor |
| 22 | * 'csp' flushes the TLBs on all PUs of a SMP |
| 23 | * 'ipte' invalidates a pte in a page table and flushes that out of |
| 24 | * the TLBs of all PUs of a SMP |
| 25 | */ |
| 26 | |
| 27 | #define local_flush_tlb() \ |
| 28 | do { __asm__ __volatile__("ptlb": : :"memory"); } while (0) |
| 29 | |
| 30 | #ifndef CONFIG_SMP |
| 31 | |
| 32 | /* |
| 33 | * We always need to flush, since s390 does not flush tlb |
| 34 | * on each context switch |
| 35 | */ |
| 36 | |
| 37 | static inline void flush_tlb(void) |
| 38 | { |
| 39 | local_flush_tlb(); |
| 40 | } |
| 41 | static inline void flush_tlb_all(void) |
| 42 | { |
| 43 | local_flush_tlb(); |
| 44 | } |
| 45 | static inline void flush_tlb_mm(struct mm_struct *mm) |
| 46 | { |
| 47 | local_flush_tlb(); |
| 48 | } |
| 49 | static inline void flush_tlb_page(struct vm_area_struct *vma, |
| 50 | unsigned long addr) |
| 51 | { |
| 52 | local_flush_tlb(); |
| 53 | } |
| 54 | static inline void flush_tlb_range(struct vm_area_struct *vma, |
| 55 | unsigned long start, unsigned long end) |
| 56 | { |
| 57 | local_flush_tlb(); |
| 58 | } |
| 59 | |
| 60 | #define flush_tlb_kernel_range(start, end) \ |
| 61 | local_flush_tlb(); |
| 62 | |
| 63 | #else |
| 64 | |
| 65 | #include <asm/smp.h> |
| 66 | |
| 67 | extern void smp_ptlb_all(void); |
| 68 | |
| 69 | static inline void global_flush_tlb(void) |
| 70 | { |
| 71 | #ifndef __s390x__ |
| 72 | if (!MACHINE_HAS_CSP) { |
| 73 | smp_ptlb_all(); |
| 74 | return; |
| 75 | } |
| 76 | #endif /* __s390x__ */ |
| 77 | { |
| 78 | register unsigned long addr asm("4"); |
| 79 | long dummy; |
| 80 | |
| 81 | dummy = 0; |
| 82 | addr = ((unsigned long) &dummy) + 1; |
| 83 | __asm__ __volatile__ ( |
| 84 | " slr 2,2\n" |
| 85 | " slr 3,3\n" |
| 86 | " csp 2,%0" |
| 87 | : : "a" (addr), "m" (dummy) : "cc", "2", "3" ); |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * We only have to do global flush of tlb if process run since last |
| 93 | * flush on any other pu than current. |
| 94 | * If we have threads (mm->count > 1) we always do a global flush, |
| 95 | * since the process runs on more than one processor at the same time. |
| 96 | */ |
| 97 | |
| 98 | static inline void __flush_tlb_mm(struct mm_struct * mm) |
| 99 | { |
| 100 | cpumask_t local_cpumask; |
| 101 | |
| 102 | if (unlikely(cpus_empty(mm->cpu_vm_mask))) |
| 103 | return; |
| 104 | if (MACHINE_HAS_IDTE) { |
| 105 | asm volatile (".insn rrf,0xb98e0000,0,%0,%1,0" |
| 106 | : : "a" (2048), |
| 107 | "a" (__pa(mm->pgd)&PAGE_MASK) : "cc" ); |
| 108 | return; |
| 109 | } |
| 110 | preempt_disable(); |
| 111 | local_cpumask = cpumask_of_cpu(smp_processor_id()); |
| 112 | if (cpus_equal(mm->cpu_vm_mask, local_cpumask)) |
| 113 | local_flush_tlb(); |
| 114 | else |
| 115 | global_flush_tlb(); |
| 116 | preempt_enable(); |
| 117 | } |
| 118 | |
| 119 | static inline void flush_tlb(void) |
| 120 | { |
| 121 | __flush_tlb_mm(current->mm); |
| 122 | } |
| 123 | static inline void flush_tlb_all(void) |
| 124 | { |
| 125 | global_flush_tlb(); |
| 126 | } |
| 127 | static inline void flush_tlb_mm(struct mm_struct *mm) |
| 128 | { |
| 129 | __flush_tlb_mm(mm); |
| 130 | } |
| 131 | static inline void flush_tlb_page(struct vm_area_struct *vma, |
| 132 | unsigned long addr) |
| 133 | { |
| 134 | __flush_tlb_mm(vma->vm_mm); |
| 135 | } |
| 136 | static inline void flush_tlb_range(struct vm_area_struct *vma, |
| 137 | unsigned long start, unsigned long end) |
| 138 | { |
| 139 | __flush_tlb_mm(vma->vm_mm); |
| 140 | } |
| 141 | |
| 142 | #define flush_tlb_kernel_range(start, end) global_flush_tlb() |
| 143 | |
| 144 | #endif |
| 145 | |
| 146 | static inline void flush_tlb_pgtables(struct mm_struct *mm, |
| 147 | unsigned long start, unsigned long end) |
| 148 | { |
| 149 | /* S/390 does not keep any page table caches in TLB */ |
| 150 | } |
| 151 | |
| 152 | #endif /* _S390_TLBFLUSH_H */ |