arch/powerpc/include/asm/mmu_context.h - linux - Git at Google

 /* 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);
 	}
 }
 #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
 }

 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;
 }

 static inline void arch_bprm_mm_init(struct mm_struct *mm,
 				     struct vm_area_struct *vma)
 {
 }

 #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 */
	/* 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);
	}
	}
	#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
	}

	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;
	}

	static inline void arch_bprm_mm_init(struct mm_struct *mm,
	struct vm_area_struct *vma)
	{
	}

	#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 */