/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_POWERPC_MMU_CONTEXT_H #define __ASM_POWERPC_MMU_CONTEXT_H #ifdef __KERNEL__ #include #include #include #include #include #include #include /* * Most if the context management is out of line */ extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); extern void destroy_context(struct mm_struct *mm); #ifdef CONFIG_SPAPR_TCE_IOMMU struct mm_iommu_table_group_mem_t; extern int isolate_lru_page(struct page *page); /* from internal.h */ extern bool mm_iommu_preregistered(struct mm_struct *mm); extern long mm_iommu_get(struct mm_struct *mm, unsigned long ua, unsigned long entries, struct mm_iommu_table_group_mem_t **pmem); extern long mm_iommu_put(struct mm_struct *mm, struct mm_iommu_table_group_mem_t *mem); extern void mm_iommu_init(struct mm_struct *mm); extern void mm_iommu_cleanup(struct mm_struct *mm); extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm, unsigned long ua, unsigned long size); extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup_rm( struct mm_struct *mm, unsigned long ua, unsigned long size); extern struct mm_iommu_table_group_mem_t *mm_iommu_find(struct mm_struct *mm, unsigned long ua, unsigned long entries); extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem, unsigned long ua, unsigned long *hpa); extern long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem, unsigned long ua, unsigned long *hpa); extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem); extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem); #endif extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); extern void set_context(unsigned long id, pgd_t *pgd); #ifdef CONFIG_PPC_BOOK3S_64 extern void radix__switch_mmu_context(struct mm_struct *prev, struct mm_struct *next); static inline void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { if (radix_enabled()) return radix__switch_mmu_context(prev, next); return switch_slb(tsk, next); } extern int hash__alloc_context_id(void); extern void hash__reserve_context_id(int id); extern void __destroy_context(int context_id); static inline void mmu_context_init(void) { } #else extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk); extern unsigned long __init_new_context(void); extern void __destroy_context(unsigned long context_id); extern void mmu_context_init(void); #endif #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU) extern void radix_kvm_prefetch_workaround(struct mm_struct *mm); #else static inline void radix_kvm_prefetch_workaround(struct mm_struct *mm) { } #endif extern void switch_cop(struct mm_struct *next); extern int use_cop(unsigned long acop, struct mm_struct *mm); extern void drop_cop(unsigned long acop, struct mm_struct *mm); #ifdef CONFIG_PPC_BOOK3S_64 static inline void inc_mm_active_cpus(struct mm_struct *mm) { atomic_inc(&mm->context.active_cpus); } static inline void dec_mm_active_cpus(struct mm_struct *mm) { atomic_dec(&mm->context.active_cpus); } static inline void mm_context_add_copro(struct mm_struct *mm) { /* * On hash, should only be called once over the lifetime of * the context, as we can't decrement the active cpus count * and flush properly for the time being. */ inc_mm_active_cpus(mm); } static inline void mm_context_remove_copro(struct mm_struct *mm) { /* * Need to broadcast a global flush of the full mm before * decrementing active_cpus count, as the next TLBI may be * local and the nMMU and/or PSL need to be cleaned up. * Should be rare enough so that it's acceptable. * * Skip on hash, as we don't know how to do the proper flush * for the time being. Invalidations will remain global if * used on hash. */ if (radix_enabled()) { flush_all_mm(mm); dec_mm_active_cpus(mm); } } #else static inline void inc_mm_active_cpus(struct mm_struct *mm) { } static inline void dec_mm_active_cpus(struct mm_struct *mm) { } static inline void mm_context_add_copro(struct mm_struct *mm) { } static inline void mm_context_remove_copro(struct mm_struct *mm) { } #endif extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk); static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { unsigned long flags; local_irq_save(flags); switch_mm_irqs_off(prev, next, tsk); local_irq_restore(flags); } #define switch_mm_irqs_off switch_mm_irqs_off #define deactivate_mm(tsk,mm) do { } while (0) /* * After we have set current->mm to a new value, this activates * the context for the new mm so we see the new mappings. */ static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) { switch_mm(prev, next, current); } /* We don't currently use enter_lazy_tlb() for anything */ static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) { /* 64-bit Book3E keeps track of current PGD in the PACA */ #ifdef CONFIG_PPC_BOOK3E_64 get_paca()->pgd = NULL; #endif } static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) { return 0; } #ifndef CONFIG_PPC_BOOK3S_64 static inline void arch_exit_mmap(struct mm_struct *mm) { } #else extern void arch_exit_mmap(struct mm_struct *mm); #endif static inline void arch_unmap(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long start, unsigned long end) { if (start <= mm->context.vdso_base && mm->context.vdso_base < end) mm->context.vdso_base = 0; } static inline void arch_bprm_mm_init(struct mm_struct *mm, struct vm_area_struct *vma) { } static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write, bool execute, bool foreign) { /* by default, allow everything */ return true; } #endif /* __KERNEL__ */ #endif /* __ASM_POWERPC_MMU_CONTEXT_H */