304 lines
9.0 KiB
C
304 lines
9.0 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_POWERPC_MMU_CONTEXT_H
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#define __ASM_POWERPC_MMU_CONTEXT_H
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#ifdef __KERNEL__
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/spinlock.h>
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#include <asm/mmu.h>
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#include <asm/cputable.h>
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#include <asm/cputhreads.h>
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/*
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* Most if the context management is out of line
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*/
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#define init_new_context init_new_context
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extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
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#define destroy_context destroy_context
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extern void destroy_context(struct mm_struct *mm);
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#ifdef CONFIG_SPAPR_TCE_IOMMU
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struct mm_iommu_table_group_mem_t;
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extern bool mm_iommu_preregistered(struct mm_struct *mm);
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extern long mm_iommu_new(struct mm_struct *mm,
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unsigned long ua, unsigned long entries,
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struct mm_iommu_table_group_mem_t **pmem);
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extern long mm_iommu_newdev(struct mm_struct *mm, unsigned long ua,
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unsigned long entries, unsigned long dev_hpa,
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struct mm_iommu_table_group_mem_t **pmem);
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extern long mm_iommu_put(struct mm_struct *mm,
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struct mm_iommu_table_group_mem_t *mem);
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extern void mm_iommu_init(struct mm_struct *mm);
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extern struct mm_iommu_table_group_mem_t *mm_iommu_lookup(struct mm_struct *mm,
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unsigned long ua, unsigned long size);
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extern struct mm_iommu_table_group_mem_t *mm_iommu_get(struct mm_struct *mm,
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unsigned long ua, unsigned long entries);
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extern long mm_iommu_ua_to_hpa(struct mm_iommu_table_group_mem_t *mem,
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unsigned long ua, unsigned int pageshift, unsigned long *hpa);
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extern bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
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unsigned int pageshift, unsigned long *size);
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extern long mm_iommu_mapped_inc(struct mm_iommu_table_group_mem_t *mem);
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extern void mm_iommu_mapped_dec(struct mm_iommu_table_group_mem_t *mem);
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#else
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static inline bool mm_iommu_is_devmem(struct mm_struct *mm, unsigned long hpa,
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unsigned int pageshift, unsigned long *size)
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{
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return false;
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}
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static inline void mm_iommu_init(struct mm_struct *mm) { }
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#endif
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extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
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#ifdef CONFIG_PPC_BOOK3S_64
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extern void radix__switch_mmu_context(struct mm_struct *prev,
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struct mm_struct *next);
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static inline void switch_mmu_context(struct mm_struct *prev,
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struct mm_struct *next,
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struct task_struct *tsk)
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{
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if (radix_enabled())
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return radix__switch_mmu_context(prev, next);
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return switch_slb(tsk, next);
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}
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extern int hash__alloc_context_id(void);
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void __init hash__reserve_context_id(int id);
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extern void __destroy_context(int context_id);
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static inline void mmu_context_init(void) { }
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#ifdef CONFIG_PPC_64S_HASH_MMU
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static inline int alloc_extended_context(struct mm_struct *mm,
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unsigned long ea)
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{
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int context_id;
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int index = ea >> MAX_EA_BITS_PER_CONTEXT;
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context_id = hash__alloc_context_id();
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if (context_id < 0)
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return context_id;
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VM_WARN_ON(mm->context.extended_id[index]);
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mm->context.extended_id[index] = context_id;
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return context_id;
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}
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static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
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{
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int context_id;
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context_id = get_user_context(&mm->context, ea);
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if (!context_id)
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return true;
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return false;
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}
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#endif
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#else
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extern void switch_mmu_context(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk);
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extern unsigned long __init_new_context(void);
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extern void __destroy_context(unsigned long context_id);
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extern void mmu_context_init(void);
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static inline int alloc_extended_context(struct mm_struct *mm,
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unsigned long ea)
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{
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/* non book3s_64 should never find this called */
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WARN_ON(1);
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return -ENOMEM;
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}
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static inline bool need_extra_context(struct mm_struct *mm, unsigned long ea)
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{
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return false;
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}
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#endif
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extern int use_cop(unsigned long acop, struct mm_struct *mm);
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extern void drop_cop(unsigned long acop, struct mm_struct *mm);
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#ifdef CONFIG_PPC_BOOK3S_64
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static inline void inc_mm_active_cpus(struct mm_struct *mm)
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{
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atomic_inc(&mm->context.active_cpus);
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}
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static inline void dec_mm_active_cpus(struct mm_struct *mm)
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{
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atomic_dec(&mm->context.active_cpus);
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}
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static inline void mm_context_add_copro(struct mm_struct *mm)
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{
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/*
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* If any copro is in use, increment the active CPU count
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* in order to force TLB invalidations to be global as to
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* propagate to the Nest MMU.
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*/
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if (atomic_inc_return(&mm->context.copros) == 1)
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inc_mm_active_cpus(mm);
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}
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static inline void mm_context_remove_copro(struct mm_struct *mm)
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{
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int c;
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/*
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* When removing the last copro, we need to broadcast a global
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* flush of the full mm, as the next TLBI may be local and the
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* nMMU and/or PSL need to be cleaned up.
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*
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* Both the 'copros' and 'active_cpus' counts are looked at in
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* flush_all_mm() to determine the scope (local/global) of the
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* TLBIs, so we need to flush first before decrementing
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* 'copros'. If this API is used by several callers for the
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* same context, it can lead to over-flushing. It's hopefully
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* not common enough to be a problem.
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*
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* Skip on hash, as we don't know how to do the proper flush
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* for the time being. Invalidations will remain global if
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* used on hash. Note that we can't drop 'copros' either, as
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* it could make some invalidations local with no flush
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* in-between.
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*/
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if (radix_enabled()) {
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flush_all_mm(mm);
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c = atomic_dec_if_positive(&mm->context.copros);
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/* Detect imbalance between add and remove */
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WARN_ON(c < 0);
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if (c == 0)
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dec_mm_active_cpus(mm);
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}
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}
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/*
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* vas_windows counter shows number of open windows in the mm
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* context. During context switch, use this counter to clear the
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* foreign real address mapping (CP_ABORT) for the thread / process
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* that intend to use COPY/PASTE. When a process closes all windows,
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* disable CP_ABORT which is expensive to run.
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*
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* For user context, register a copro so that TLBIs are seen by the
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* nest MMU. mm_context_add/remove_vas_window() are used only for user
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* space windows.
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*/
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static inline void mm_context_add_vas_window(struct mm_struct *mm)
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{
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atomic_inc(&mm->context.vas_windows);
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mm_context_add_copro(mm);
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}
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static inline void mm_context_remove_vas_window(struct mm_struct *mm)
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{
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int v;
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mm_context_remove_copro(mm);
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v = atomic_dec_if_positive(&mm->context.vas_windows);
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/* Detect imbalance between add and remove */
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WARN_ON(v < 0);
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}
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#else
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static inline void inc_mm_active_cpus(struct mm_struct *mm) { }
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static inline void dec_mm_active_cpus(struct mm_struct *mm) { }
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static inline void mm_context_add_copro(struct mm_struct *mm) { }
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static inline void mm_context_remove_copro(struct mm_struct *mm) { }
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#endif
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#if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE) && defined(CONFIG_PPC_RADIX_MMU)
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void do_h_rpt_invalidate_prt(unsigned long pid, unsigned long lpid,
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unsigned long type, unsigned long pg_sizes,
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unsigned long start, unsigned long end);
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#else
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static inline void do_h_rpt_invalidate_prt(unsigned long pid,
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unsigned long lpid,
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unsigned long type,
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unsigned long pg_sizes,
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unsigned long start,
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unsigned long end) { }
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#endif
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extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk);
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk)
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{
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unsigned long flags;
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local_irq_save(flags);
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switch_mm_irqs_off(prev, next, tsk);
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local_irq_restore(flags);
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}
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#define switch_mm_irqs_off switch_mm_irqs_off
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/*
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* After we have set current->mm to a new value, this activates
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* the context for the new mm so we see the new mappings.
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*/
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#define activate_mm activate_mm
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static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
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{
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switch_mm_irqs_off(prev, next, current);
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}
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/* We don't currently use enter_lazy_tlb() for anything */
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#ifdef CONFIG_PPC_BOOK3E_64
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#define enter_lazy_tlb enter_lazy_tlb
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static inline void enter_lazy_tlb(struct mm_struct *mm,
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struct task_struct *tsk)
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{
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/* 64-bit Book3E keeps track of current PGD in the PACA */
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get_paca()->pgd = NULL;
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}
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#endif
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extern void arch_exit_mmap(struct mm_struct *mm);
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static inline void arch_unmap(struct mm_struct *mm,
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unsigned long start, unsigned long end)
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{
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unsigned long vdso_base = (unsigned long)mm->context.vdso;
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if (start <= vdso_base && vdso_base < end)
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mm->context.vdso = NULL;
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}
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#ifdef CONFIG_PPC_MEM_KEYS
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bool arch_vma_access_permitted(struct vm_area_struct *vma, bool write,
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bool execute, bool foreign);
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void arch_dup_pkeys(struct mm_struct *oldmm, struct mm_struct *mm);
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#else /* CONFIG_PPC_MEM_KEYS */
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static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
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bool write, bool execute, bool foreign)
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{
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/* by default, allow everything */
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return true;
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}
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#define pkey_mm_init(mm)
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#define arch_dup_pkeys(oldmm, mm)
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static inline u64 pte_to_hpte_pkey_bits(u64 pteflags, unsigned long flags)
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{
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return 0x0UL;
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}
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#endif /* CONFIG_PPC_MEM_KEYS */
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static inline int arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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{
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arch_dup_pkeys(oldmm, mm);
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return 0;
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}
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#include <asm-generic/mmu_context.h>
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#endif /* __KERNEL__ */
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#endif /* __ASM_POWERPC_MMU_CONTEXT_H */
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