480 lines
14 KiB
C
480 lines
14 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SCHED_MM_H
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#define _LINUX_SCHED_MM_H
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#include <linux/kernel.h>
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#include <linux/atomic.h>
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#include <linux/sched.h>
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#include <linux/mm_types.h>
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#include <linux/gfp.h>
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#include <linux/sync_core.h>
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#include <linux/ioasid.h>
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/*
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* Routines for handling mm_structs
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*/
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extern struct mm_struct *mm_alloc(void);
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/**
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* mmgrab() - Pin a &struct mm_struct.
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* @mm: The &struct mm_struct to pin.
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*
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* Make sure that @mm will not get freed even after the owning task
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* exits. This doesn't guarantee that the associated address space
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* will still exist later on and mmget_not_zero() has to be used before
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* accessing it.
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*
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* This is a preferred way to pin @mm for a longer/unbounded amount
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* of time.
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*
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* Use mmdrop() to release the reference acquired by mmgrab().
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*
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* See also <Documentation/mm/active_mm.rst> for an in-depth explanation
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* of &mm_struct.mm_count vs &mm_struct.mm_users.
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*/
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static inline void mmgrab(struct mm_struct *mm)
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{
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atomic_inc(&mm->mm_count);
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}
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extern void __mmdrop(struct mm_struct *mm);
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static inline void mmdrop(struct mm_struct *mm)
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{
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/*
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* The implicit full barrier implied by atomic_dec_and_test() is
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* required by the membarrier system call before returning to
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* user-space, after storing to rq->curr.
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*/
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if (unlikely(atomic_dec_and_test(&mm->mm_count)))
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__mmdrop(mm);
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}
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#ifdef CONFIG_PREEMPT_RT
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/*
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* RCU callback for delayed mm drop. Not strictly RCU, but call_rcu() is
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* by far the least expensive way to do that.
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*/
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static inline void __mmdrop_delayed(struct rcu_head *rhp)
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{
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struct mm_struct *mm = container_of(rhp, struct mm_struct, delayed_drop);
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__mmdrop(mm);
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}
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/*
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* Invoked from finish_task_switch(). Delegates the heavy lifting on RT
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* kernels via RCU.
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*/
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static inline void mmdrop_sched(struct mm_struct *mm)
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{
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/* Provides a full memory barrier. See mmdrop() */
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if (atomic_dec_and_test(&mm->mm_count))
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call_rcu(&mm->delayed_drop, __mmdrop_delayed);
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}
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#else
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static inline void mmdrop_sched(struct mm_struct *mm)
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{
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mmdrop(mm);
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}
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#endif
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/**
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* mmget() - Pin the address space associated with a &struct mm_struct.
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* @mm: The address space to pin.
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*
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* Make sure that the address space of the given &struct mm_struct doesn't
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* go away. This does not protect against parts of the address space being
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* modified or freed, however.
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*
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* Never use this function to pin this address space for an
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* unbounded/indefinite amount of time.
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*
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* Use mmput() to release the reference acquired by mmget().
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*
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* See also <Documentation/mm/active_mm.rst> for an in-depth explanation
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* of &mm_struct.mm_count vs &mm_struct.mm_users.
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*/
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static inline void mmget(struct mm_struct *mm)
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{
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atomic_inc(&mm->mm_users);
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}
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static inline bool mmget_not_zero(struct mm_struct *mm)
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{
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return atomic_inc_not_zero(&mm->mm_users);
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}
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/* mmput gets rid of the mappings and all user-space */
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extern void mmput(struct mm_struct *);
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#ifdef CONFIG_MMU
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/* same as above but performs the slow path from the async context. Can
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* be called from the atomic context as well
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*/
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void mmput_async(struct mm_struct *);
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#endif
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/* Grab a reference to a task's mm, if it is not already going away */
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extern struct mm_struct *get_task_mm(struct task_struct *task);
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/*
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* Grab a reference to a task's mm, if it is not already going away
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* and ptrace_may_access with the mode parameter passed to it
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* succeeds.
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*/
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extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
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/* Remove the current tasks stale references to the old mm_struct on exit() */
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extern void exit_mm_release(struct task_struct *, struct mm_struct *);
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/* Remove the current tasks stale references to the old mm_struct on exec() */
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extern void exec_mm_release(struct task_struct *, struct mm_struct *);
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#ifdef CONFIG_MEMCG
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extern void mm_update_next_owner(struct mm_struct *mm);
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#else
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static inline void mm_update_next_owner(struct mm_struct *mm)
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{
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}
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#endif /* CONFIG_MEMCG */
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#ifdef CONFIG_MMU
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#ifndef arch_get_mmap_end
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#define arch_get_mmap_end(addr, len, flags) (TASK_SIZE)
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#endif
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#ifndef arch_get_mmap_base
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#define arch_get_mmap_base(addr, base) (base)
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#endif
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extern void arch_pick_mmap_layout(struct mm_struct *mm,
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struct rlimit *rlim_stack);
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extern unsigned long
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arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
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unsigned long, unsigned long);
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extern unsigned long
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arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags);
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unsigned long
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generic_get_unmapped_area(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags);
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unsigned long
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generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags);
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#else
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static inline void arch_pick_mmap_layout(struct mm_struct *mm,
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struct rlimit *rlim_stack) {}
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#endif
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static inline bool in_vfork(struct task_struct *tsk)
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{
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bool ret;
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/*
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* need RCU to access ->real_parent if CLONE_VM was used along with
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* CLONE_PARENT.
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*
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* We check real_parent->mm == tsk->mm because CLONE_VFORK does not
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* imply CLONE_VM
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*
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* CLONE_VFORK can be used with CLONE_PARENT/CLONE_THREAD and thus
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* ->real_parent is not necessarily the task doing vfork(), so in
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* theory we can't rely on task_lock() if we want to dereference it.
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*
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* And in this case we can't trust the real_parent->mm == tsk->mm
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* check, it can be false negative. But we do not care, if init or
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* another oom-unkillable task does this it should blame itself.
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*/
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rcu_read_lock();
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ret = tsk->vfork_done &&
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rcu_dereference(tsk->real_parent)->mm == tsk->mm;
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rcu_read_unlock();
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return ret;
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}
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/*
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* Applies per-task gfp context to the given allocation flags.
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* PF_MEMALLOC_NOIO implies GFP_NOIO
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* PF_MEMALLOC_NOFS implies GFP_NOFS
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* PF_MEMALLOC_PIN implies !GFP_MOVABLE
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*/
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static inline gfp_t current_gfp_context(gfp_t flags)
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{
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unsigned int pflags = READ_ONCE(current->flags);
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if (unlikely(pflags & (PF_MEMALLOC_NOIO | PF_MEMALLOC_NOFS | PF_MEMALLOC_PIN))) {
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/*
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* NOIO implies both NOIO and NOFS and it is a weaker context
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* so always make sure it makes precedence
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*/
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if (pflags & PF_MEMALLOC_NOIO)
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flags &= ~(__GFP_IO | __GFP_FS);
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else if (pflags & PF_MEMALLOC_NOFS)
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flags &= ~__GFP_FS;
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if (pflags & PF_MEMALLOC_PIN)
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flags &= ~__GFP_MOVABLE;
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}
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return flags;
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}
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#ifdef CONFIG_LOCKDEP
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extern void __fs_reclaim_acquire(unsigned long ip);
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extern void __fs_reclaim_release(unsigned long ip);
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extern void fs_reclaim_acquire(gfp_t gfp_mask);
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extern void fs_reclaim_release(gfp_t gfp_mask);
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#else
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static inline void __fs_reclaim_acquire(unsigned long ip) { }
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static inline void __fs_reclaim_release(unsigned long ip) { }
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static inline void fs_reclaim_acquire(gfp_t gfp_mask) { }
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static inline void fs_reclaim_release(gfp_t gfp_mask) { }
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#endif
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/* Any memory-allocation retry loop should use
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* memalloc_retry_wait(), and pass the flags for the most
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* constrained allocation attempt that might have failed.
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* This provides useful documentation of where loops are,
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* and a central place to fine tune the waiting as the MM
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* implementation changes.
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*/
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static inline void memalloc_retry_wait(gfp_t gfp_flags)
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{
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/* We use io_schedule_timeout because waiting for memory
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* typically included waiting for dirty pages to be
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* written out, which requires IO.
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*/
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__set_current_state(TASK_UNINTERRUPTIBLE);
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gfp_flags = current_gfp_context(gfp_flags);
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if (gfpflags_allow_blocking(gfp_flags) &&
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!(gfp_flags & __GFP_NORETRY))
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/* Probably waited already, no need for much more */
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io_schedule_timeout(1);
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else
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/* Probably didn't wait, and has now released a lock,
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* so now is a good time to wait
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*/
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io_schedule_timeout(HZ/50);
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}
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/**
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* might_alloc - Mark possible allocation sites
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* @gfp_mask: gfp_t flags that would be used to allocate
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*
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* Similar to might_sleep() and other annotations, this can be used in functions
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* that might allocate, but often don't. Compiles to nothing without
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* CONFIG_LOCKDEP. Includes a conditional might_sleep() if @gfp allows blocking.
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*/
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static inline void might_alloc(gfp_t gfp_mask)
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{
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fs_reclaim_acquire(gfp_mask);
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fs_reclaim_release(gfp_mask);
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might_sleep_if(gfpflags_allow_blocking(gfp_mask));
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}
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/**
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* memalloc_noio_save - Marks implicit GFP_NOIO allocation scope.
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*
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* This functions marks the beginning of the GFP_NOIO allocation scope.
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* All further allocations will implicitly drop __GFP_IO flag and so
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* they are safe for the IO critical section from the allocation recursion
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* point of view. Use memalloc_noio_restore to end the scope with flags
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* returned by this function.
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*
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* This function is safe to be used from any context.
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*/
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static inline unsigned int memalloc_noio_save(void)
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{
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unsigned int flags = current->flags & PF_MEMALLOC_NOIO;
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current->flags |= PF_MEMALLOC_NOIO;
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return flags;
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}
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/**
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* memalloc_noio_restore - Ends the implicit GFP_NOIO scope.
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* @flags: Flags to restore.
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*
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* Ends the implicit GFP_NOIO scope started by memalloc_noio_save function.
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* Always make sure that the given flags is the return value from the
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* pairing memalloc_noio_save call.
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*/
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static inline void memalloc_noio_restore(unsigned int flags)
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{
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current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags;
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}
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/**
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* memalloc_nofs_save - Marks implicit GFP_NOFS allocation scope.
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*
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* This functions marks the beginning of the GFP_NOFS allocation scope.
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* All further allocations will implicitly drop __GFP_FS flag and so
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* they are safe for the FS critical section from the allocation recursion
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* point of view. Use memalloc_nofs_restore to end the scope with flags
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* returned by this function.
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*
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* This function is safe to be used from any context.
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*/
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static inline unsigned int memalloc_nofs_save(void)
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{
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unsigned int flags = current->flags & PF_MEMALLOC_NOFS;
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current->flags |= PF_MEMALLOC_NOFS;
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return flags;
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}
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/**
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* memalloc_nofs_restore - Ends the implicit GFP_NOFS scope.
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* @flags: Flags to restore.
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*
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* Ends the implicit GFP_NOFS scope started by memalloc_nofs_save function.
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* Always make sure that the given flags is the return value from the
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* pairing memalloc_nofs_save call.
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*/
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static inline void memalloc_nofs_restore(unsigned int flags)
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{
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current->flags = (current->flags & ~PF_MEMALLOC_NOFS) | flags;
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}
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static inline unsigned int memalloc_noreclaim_save(void)
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{
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unsigned int flags = current->flags & PF_MEMALLOC;
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current->flags |= PF_MEMALLOC;
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return flags;
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}
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static inline void memalloc_noreclaim_restore(unsigned int flags)
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{
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current->flags = (current->flags & ~PF_MEMALLOC) | flags;
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}
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static inline unsigned int memalloc_pin_save(void)
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{
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unsigned int flags = current->flags & PF_MEMALLOC_PIN;
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current->flags |= PF_MEMALLOC_PIN;
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return flags;
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}
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static inline void memalloc_pin_restore(unsigned int flags)
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{
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current->flags = (current->flags & ~PF_MEMALLOC_PIN) | flags;
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}
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#ifdef CONFIG_MEMCG
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DECLARE_PER_CPU(struct mem_cgroup *, int_active_memcg);
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/**
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* set_active_memcg - Starts the remote memcg charging scope.
|
||
|
|
* @memcg: memcg to charge.
|
||
|
|
*
|
||
|
|
* This function marks the beginning of the remote memcg charging scope. All the
|
||
|
|
* __GFP_ACCOUNT allocations till the end of the scope will be charged to the
|
||
|
|
* given memcg.
|
||
|
|
*
|
||
|
|
* NOTE: This function can nest. Users must save the return value and
|
||
|
|
* reset the previous value after their own charging scope is over.
|
||
|
|
*/
|
||
|
|
static inline struct mem_cgroup *
|
||
|
|
set_active_memcg(struct mem_cgroup *memcg)
|
||
|
|
{
|
||
|
|
struct mem_cgroup *old;
|
||
|
|
|
||
|
|
if (!in_task()) {
|
||
|
|
old = this_cpu_read(int_active_memcg);
|
||
|
|
this_cpu_write(int_active_memcg, memcg);
|
||
|
|
} else {
|
||
|
|
old = current->active_memcg;
|
||
|
|
current->active_memcg = memcg;
|
||
|
|
}
|
||
|
|
|
||
|
|
return old;
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
static inline struct mem_cgroup *
|
||
|
|
set_active_memcg(struct mem_cgroup *memcg)
|
||
|
|
{
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_MEMBARRIER
|
||
|
|
enum {
|
||
|
|
MEMBARRIER_STATE_PRIVATE_EXPEDITED_READY = (1U << 0),
|
||
|
|
MEMBARRIER_STATE_PRIVATE_EXPEDITED = (1U << 1),
|
||
|
|
MEMBARRIER_STATE_GLOBAL_EXPEDITED_READY = (1U << 2),
|
||
|
|
MEMBARRIER_STATE_GLOBAL_EXPEDITED = (1U << 3),
|
||
|
|
MEMBARRIER_STATE_PRIVATE_EXPEDITED_SYNC_CORE_READY = (1U << 4),
|
||
|
|
MEMBARRIER_STATE_PRIVATE_EXPEDITED_SYNC_CORE = (1U << 5),
|
||
|
|
MEMBARRIER_STATE_PRIVATE_EXPEDITED_RSEQ_READY = (1U << 6),
|
||
|
|
MEMBARRIER_STATE_PRIVATE_EXPEDITED_RSEQ = (1U << 7),
|
||
|
|
};
|
||
|
|
|
||
|
|
enum {
|
||
|
|
MEMBARRIER_FLAG_SYNC_CORE = (1U << 0),
|
||
|
|
MEMBARRIER_FLAG_RSEQ = (1U << 1),
|
||
|
|
};
|
||
|
|
|
||
|
|
#ifdef CONFIG_ARCH_HAS_MEMBARRIER_CALLBACKS
|
||
|
|
#include <asm/membarrier.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static inline void membarrier_mm_sync_core_before_usermode(struct mm_struct *mm)
|
||
|
|
{
|
||
|
|
if (current->mm != mm)
|
||
|
|
return;
|
||
|
|
if (likely(!(atomic_read(&mm->membarrier_state) &
|
||
|
|
MEMBARRIER_STATE_PRIVATE_EXPEDITED_SYNC_CORE)))
|
||
|
|
return;
|
||
|
|
sync_core_before_usermode();
|
||
|
|
}
|
||
|
|
|
||
|
|
extern void membarrier_exec_mmap(struct mm_struct *mm);
|
||
|
|
|
||
|
|
extern void membarrier_update_current_mm(struct mm_struct *next_mm);
|
||
|
|
|
||
|
|
#else
|
||
|
|
#ifdef CONFIG_ARCH_HAS_MEMBARRIER_CALLBACKS
|
||
|
|
static inline void membarrier_arch_switch_mm(struct mm_struct *prev,
|
||
|
|
struct mm_struct *next,
|
||
|
|
struct task_struct *tsk)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
static inline void membarrier_exec_mmap(struct mm_struct *mm)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
static inline void membarrier_mm_sync_core_before_usermode(struct mm_struct *mm)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
static inline void membarrier_update_current_mm(struct mm_struct *next_mm)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef CONFIG_IOMMU_SVA
|
||
|
|
static inline void mm_pasid_init(struct mm_struct *mm)
|
||
|
|
{
|
||
|
|
mm->pasid = INVALID_IOASID;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Associate a PASID with an mm_struct: */
|
||
|
|
static inline void mm_pasid_set(struct mm_struct *mm, u32 pasid)
|
||
|
|
{
|
||
|
|
mm->pasid = pasid;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline void mm_pasid_drop(struct mm_struct *mm)
|
||
|
|
{
|
||
|
|
if (pasid_valid(mm->pasid)) {
|
||
|
|
ioasid_free(mm->pasid);
|
||
|
|
mm->pasid = INVALID_IOASID;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
static inline void mm_pasid_init(struct mm_struct *mm) {}
|
||
|
|
static inline void mm_pasid_set(struct mm_struct *mm, u32 pasid) {}
|
||
|
|
static inline void mm_pasid_drop(struct mm_struct *mm) {}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* _LINUX_SCHED_MM_H */
|