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Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/include/asm/mmu_context.h | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h new file mode 100644 index 000000000..e02aa7934 --- /dev/null +++ b/arch/powerpc/include/asm/mmu_context.h @@ -0,0 +1,302 @@ +/* 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 + */ +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_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 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_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 long mm_iommu_ua_to_hpa_rm(struct mm_iommu_table_group_mem_t *mem, + unsigned long ua, unsigned int pageshift, unsigned long *hpa); +extern void mm_iommu_ua_mark_dirty_rm(struct mm_struct *mm, unsigned long ua); +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); +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) { } + +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; +} + +#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 + +#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) +{ + /* + * 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 + * 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()) { + 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 + + +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_irqs_off(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 +} + +extern void arch_exit_mmap(struct mm_struct *mm); + +static inline void arch_unmap(struct mm_struct *mm, + unsigned long start, unsigned long end) +{ + if (start <= mm->context.vdso_base && mm->context.vdso_base < end) + mm->context.vdso_base = 0; +} + +#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 thread_pkey_regs_save(thread) +#define thread_pkey_regs_restore(new_thread, old_thread) +#define thread_pkey_regs_init(thread) +#define arch_dup_pkeys(oldmm, mm) + +static inline u64 pte_to_hpte_pkey_bits(u64 pteflags) +{ + 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; +} + +#endif /* __KERNEL__ */ +#endif /* __ASM_POWERPC_MMU_CONTEXT_H */ |