1 #ifndef __ASM_POWERPC_MMU_CONTEXT_H 2 #define __ASM_POWERPC_MMU_CONTEXT_H 3 #ifdef __KERNEL__ 4 5 #include <linux/kernel.h> 6 #include <linux/mm.h> 7 #include <linux/sched.h> 8 #include <linux/spinlock.h> 9 #include <asm/mmu.h> 10 #include <asm/cputable.h> 11 #include <asm/cputhreads.h> 12 13 /* 14 * Most if the context management is out of line 15 */ 16 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); 17 extern void destroy_context(struct mm_struct *mm); 18 #ifdef CONFIG_SPAPR_TCE_IOMMU 19 struct mm_iommu_table_group_mem_t; 20 21 extern int isolate_lru_page(struct page *page); /* from internal.h */ 22 extern bool mm_iommu_preregistered(struct mm_struct *mm); 23 extern long mm_iommu_get(struct mm_struct *mm, 24 unsigned long ua, unsigned long entries, 25 struct mm_iommu_table_group_mem_t **pmem); 26 extern long mm_iommu_put(struct mm_struct *mm, 27 struct mm_iommu_table_group_mem_t *mem); 28 extern void mm_iommu_init(struct mm_struct *mm); 29 extern void mm_iommu_cleanup(struct mm_struct *mm); 30 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm, 31 unsigned long ua, unsigned long size); 32 extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup_rm( 33 struct mm_struct *mm, unsigned long ua, unsigned long size); 34 extern struct mm_iommu_table_group_mem_t *mm_iommu_find(struct mm_struct *mm, 35 unsigned long ua, unsigned long entries); 36 extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, 37 unsigned long ua, unsigned long *hpa); 38 extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem, 39 unsigned long ua, unsigned long *hpa); 40 extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem); 41 extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem); 42 #endif 43 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); 44 extern void set_context(unsigned long id, pgd_t *pgd); 45 46 #ifdef CONFIG_PPC_BOOK3S_64 47 extern void radix__switch_mmu_context(struct mm_struct *prev, 48 struct mm_struct *next); 49 static inline void switch_mmu_context(struct mm_struct *prev, 50 struct mm_struct *next, 51 struct task_struct *tsk) 52 { 53 if (radix_enabled()) 54 return radix__switch_mmu_context(prev, next); 55 return switch_slb(tsk, next); 56 } 57 58 extern int hash__alloc_context_id(void); 59 extern void hash__reserve_context_id(int id); 60 extern void __destroy_context(int context_id); 61 static inline void mmu_context_init(void) { } 62 #else 63 extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next, 64 struct task_struct *tsk); 65 extern unsigned long __init_new_context(void); 66 extern void __destroy_context(unsigned long context_id); 67 extern void mmu_context_init(void); 68 #endif 69 70 #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU) 71 extern void radix_kvm_prefetch_workaround(struct mm_struct *mm); 72 #else 73 static inline void radix_kvm_prefetch_workaround(struct mm_struct *mm) { } 74 #endif 75 76 extern void switch_cop(struct mm_struct *next); 77 extern int use_cop(unsigned long acop, struct mm_struct *mm); 78 extern void drop_cop(unsigned long acop, struct mm_struct *mm); 79 80 /* 81 * switch_mm is the entry point called from the architecture independent 82 * code in kernel/sched/core.c 83 */ 84 static inline void switch_mm_irqs_off(struct mm_struct *prev, 85 struct mm_struct *next, 86 struct task_struct *tsk) 87 { 88 bool new_on_cpu = false; 89 90 /* Mark this context has been used on the new CPU */ 91 if (!cpumask_test_cpu(smp_processor_id(), mm_cpumask(next))) { 92 cpumask_set_cpu(smp_processor_id(), mm_cpumask(next)); 93 new_on_cpu = true; 94 } 95 96 /* 32-bit keeps track of the current PGDIR in the thread struct */ 97 #ifdef CONFIG_PPC32 98 tsk->thread.pgdir = next->pgd; 99 #endif /* CONFIG_PPC32 */ 100 101 /* 64-bit Book3E keeps track of current PGD in the PACA */ 102 #ifdef CONFIG_PPC_BOOK3E_64 103 get_paca()->pgd = next->pgd; 104 #endif 105 /* Nothing else to do if we aren't actually switching */ 106 if (prev == next) 107 return; 108 109 #ifdef CONFIG_PPC_ICSWX 110 /* Switch coprocessor context only if prev or next uses a coprocessor */ 111 if (prev->context.acop || next->context.acop) 112 switch_cop(next); 113 #endif /* CONFIG_PPC_ICSWX */ 114 115 /* We must stop all altivec streams before changing the HW 116 * context 117 */ 118 #ifdef CONFIG_ALTIVEC 119 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 120 asm volatile ("dssall"); 121 #endif /* CONFIG_ALTIVEC */ 122 123 if (new_on_cpu) 124 radix_kvm_prefetch_workaround(next); 125 126 /* 127 * The actual HW switching method differs between the various 128 * sub architectures. Out of line for now 129 */ 130 switch_mmu_context(prev, next, tsk); 131 } 132 133 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 134 struct task_struct *tsk) 135 { 136 unsigned long flags; 137 138 local_irq_save(flags); 139 switch_mm_irqs_off(prev, next, tsk); 140 local_irq_restore(flags); 141 } 142 #define switch_mm_irqs_off switch_mm_irqs_off 143 144 145 #define deactivate_mm(tsk,mm) do { } while (0) 146 147 /* 148 * After we have set current->mm to a new value, this activates 149 * the context for the new mm so we see the new mappings. 150 */ 151 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) 152 { 153 unsigned long flags; 154 155 local_irq_save(flags); 156 switch_mm(prev, next, current); 157 local_irq_restore(flags); 158 } 159 160 /* We don't currently use enter_lazy_tlb() for anything */ 161 static inline void enter_lazy_tlb(struct mm_struct *mm, 162 struct task_struct *tsk) 163 { 164 /* 64-bit Book3E keeps track of current PGD in the PACA */ 165 #ifdef CONFIG_PPC_BOOK3E_64 166 get_paca()->pgd = NULL; 167 #endif 168 } 169 170 static inline void arch_dup_mmap(struct mm_struct *oldmm, 171 struct mm_struct *mm) 172 { 173 } 174 175 static inline void arch_exit_mmap(struct mm_struct *mm) 176 { 177 } 178 179 static inline void arch_unmap(struct mm_struct *mm, 180 struct vm_area_struct *vma, 181 unsigned long start, unsigned long end) 182 { 183 if (start <= mm->context.vdso_base && mm->context.vdso_base < end) 184 mm->context.vdso_base = 0; 185 } 186 187 static inline void arch_bprm_mm_init(struct mm_struct *mm, 188 struct vm_area_struct *vma) 189 { 190 } 191 192 static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, 193 bool write, bool execute, bool foreign) 194 { 195 /* by default, allow everything */ 196 return true; 197 } 198 #endif /* __KERNEL__ */ 199 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */ 200