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mmu_context.h
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_POWERPC_MMU_CONTEXT_H #define __ASM_POWERPC_MMU_CONTEXT_H #ifdef __KERNEL__ #include <linux/kernel.h> #include <linux/mm.h> #include <linux/sched.h> #include <linux/spinlock.h> #include <asm/mmu.h> #include <asm/cputable.h> #include <asm/cputhreads.h> /* * Most if the context management is out of line */ #define init_new_context init_new_context extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm); #define destroy_context destroy_context extern void destroy_context(struct mm_struct *mm); #ifdef CONFIG_SPAPR_TCE_IOMMU struct mm_iommu_table_group_mem_t; extern bool mm_iommu_preregistered(struct mm_struct *mm); extern long mm_iommu_new(struct mm_struct *mm, unsigned long ua, unsigned long entries, struct mm_iommu_table_group_mem_t **pmem); extern long mm_iommu_newdev(struct mm_struct *mm, unsigned long ua, unsigned long entries, unsigned long dev_hpa, 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 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_get(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 int pageshift, unsigned long *hpa); extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa, unsigned int pageshift, unsigned long *size); 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); #else static inline bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa, unsigned int pageshift, unsigned long *size) { return false; } static inline void mm_iommu_init(struct mm_struct *mm) { } #endif extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm); #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); void __init hash__reserve_context_id(int id); extern void __destroy_context(int context_id); static inline void mmu_context_init(void) { } #ifdef CONFIG_PPC_64S_HASH_MMU static inline int alloc_extended_context(struct mm_struct *mm, unsigned long ea) { int context_id; int index = ea >> MAX_EA_BITS_PER_CONTEXT; context_id = hash__alloc_context_id(); if (context_id < 0) return context_id; VM_WARN_ON(mm->context.extended_id[index]); mm->context.extended_id[index] = context_id; return context_id; } static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea) { int context_id; context_id = get_user_context(&mm->context, ea); if (!context_id) return true; return false; } #endif #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); static inline int alloc_extended_context(struct mm_struct *mm, unsigned long ea) { /* non book3s_64 should never find this called */ WARN_ON(1); return -ENOMEM; } static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea) { return false; } #endif 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) { VM_WARN_ON_ONCE(atomic_read(&mm->context.active_cpus) <= 0); atomic_dec(&mm->context.active_cpus); } static inline void mm_context_add_copro(struct mm_struct *mm) { /* * If any copro is in use, increment the active CPU count * in order to force TLB invalidations to be global as to * propagate to the Nest MMU. */ if (atomic_inc_return(&mm->context.copros) == 1) inc_mm_active_cpus(mm); } static inline void mm_context_remove_copro(struct mm_struct *mm) { int c; /* * When removing the last copro, we need to broadcast a global * flush of the full mm, as the next TLBI may be local and the * nMMU and/or PSL need to be cleaned up. * * Both the 'copros' and 'active_cpus' counts are looked at in * radix__flush_all_mm() to determine the scope (local/global) * of the TLBIs, so we need to flush first before decrementing * 'copros'. If this API is used by several callers for the * same context, it can lead to over-flushing. It's hopefully * not common enough to be a problem. * * 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. Note that we can't drop 'copros' either, as * it could make some invalidations local with no flush * in-between. */ if (radix_enabled()) { radix__flush_all_mm(mm); c = atomic_dec_if_positive(&mm->context.copros); /* Detect imbalance between add and remove */ WARN_ON(c < 0); if (c == 0) dec_mm_active_cpus(mm); } } /* * vas_windows counter shows number of open windows in the mm * context. During context switch, use this counter to clear the * foreign real address mapping (CP_ABORT) for the thread / process * that intend to use COPY/PASTE. When a process closes all windows, * disable CP_ABORT which is expensive to run. * * For user context, register a copro so that TLBIs are seen by the * nest MMU. mm_context_add/remove_vas_window() are used only for user * space windows. */ static inline void mm_context_add_vas_window(struct mm_struct *mm) { atomic_inc(&mm->context.vas_windows); mm_context_add_copro(mm); } static inline void mm_context_remove_vas_window(struct mm_struct *mm) { int v; mm_context_remove_copro(mm); v = atomic_dec_if_positive(&mm->context.vas_windows); /* Detect imbalance between add and remove */ WARN_ON(v < 0); } #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 #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU) void do_h_rpt_invalidate_prt(unsigned long pid, unsigned long lpid, unsigned long type, unsigned long pg_sizes, unsigned long start, unsigned long end); #else static inline void do_h_rpt_invalidate_prt(unsigned long pid, unsigned long lpid, unsigned long type, unsigned long pg_sizes, unsigned long start, unsigned long end) { } #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 /* * After we have set current->mm to a new value, this activates * the context for the new mm so we see the new mappings. */ #define activate_mm activate_mm static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) { switch_mm_irqs_off(prev, next, current); } /* We don't currently use enter_lazy_tlb() for anything */ #ifdef CONFIG_PPC_BOOK3E_64 #define enter_lazy_tlb enter_lazy_tlb 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 */ get_paca()->pgd = NULL; } #endif extern void arch_exit_mmap(struct mm_struct *mm); static inline void arch_unmap(struct mm_struct *mm, unsigned long start, unsigned long end) { unsigned long vdso_base = (unsigned long)mm->context.vdso; if (start <= vdso_base && vdso_base < end) mm->context.vdso = NULL; } #ifdef CONFIG_PPC_MEM_KEYS bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write, bool execute, bool foreign); void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm); #else /* CONFIG_PPC_MEM_KEYS */ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write, bool execute, bool foreign) { /* by default, allow everything */ return true; } #define pkey_mm_init(mm) #define arch_dup_pkeys(oldmm, mm) static inline u64 pte_to_hpte_pkey_bits(u64 pteflags, unsigned long flags) { return 0x0UL; } #endif /* CONFIG_PPC_MEM_KEYS */ static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm) { arch_dup_pkeys(oldmm, mm); return 0; } #include <asm-generic/mmu_context.h> #endif /* __KERNEL__ */ #endif /* __ASM_POWERPC_MMU_CONTEXT_H */
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