275 lines
8.1 KiB
C
275 lines
8.1 KiB
C
|
/* 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_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 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 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) { }
|
||
|
|
|
||
|
|
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_ea_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_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
|
||
|
|
}
|
||
|
|
|
||
|
|
#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)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
#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 */
|