forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
746 lines
24 KiB
746 lines
24 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef _LINUX_MMU_NOTIFIER_H |
|
#define _LINUX_MMU_NOTIFIER_H |
|
|
|
#include <linux/list.h> |
|
#include <linux/spinlock.h> |
|
#include <linux/mm_types.h> |
|
#include <linux/mmap_lock.h> |
|
#include <linux/srcu.h> |
|
#include <linux/interval_tree.h> |
|
|
|
struct mmu_notifier_subscriptions; |
|
struct mmu_notifier; |
|
struct mmu_notifier_range; |
|
struct mmu_interval_notifier; |
|
|
|
/** |
|
* enum mmu_notifier_event - reason for the mmu notifier callback |
|
* @MMU_NOTIFY_UNMAP: either munmap() that unmap the range or a mremap() that |
|
* move the range |
|
* |
|
* @MMU_NOTIFY_CLEAR: clear page table entry (many reasons for this like |
|
* madvise() or replacing a page by another one, ...). |
|
* |
|
* @MMU_NOTIFY_PROTECTION_VMA: update is due to protection change for the range |
|
* ie using the vma access permission (vm_page_prot) to update the whole range |
|
* is enough no need to inspect changes to the CPU page table (mprotect() |
|
* syscall) |
|
* |
|
* @MMU_NOTIFY_PROTECTION_PAGE: update is due to change in read/write flag for |
|
* pages in the range so to mirror those changes the user must inspect the CPU |
|
* page table (from the end callback). |
|
* |
|
* @MMU_NOTIFY_SOFT_DIRTY: soft dirty accounting (still same page and same |
|
* access flags). User should soft dirty the page in the end callback to make |
|
* sure that anyone relying on soft dirtyness catch pages that might be written |
|
* through non CPU mappings. |
|
* |
|
* @MMU_NOTIFY_RELEASE: used during mmu_interval_notifier invalidate to signal |
|
* that the mm refcount is zero and the range is no longer accessible. |
|
* |
|
* @MMU_NOTIFY_MIGRATE: used during migrate_vma_collect() invalidate to signal |
|
* a device driver to possibly ignore the invalidation if the |
|
* migrate_pgmap_owner field matches the driver's device private pgmap owner. |
|
*/ |
|
enum mmu_notifier_event { |
|
MMU_NOTIFY_UNMAP = 0, |
|
MMU_NOTIFY_CLEAR, |
|
MMU_NOTIFY_PROTECTION_VMA, |
|
MMU_NOTIFY_PROTECTION_PAGE, |
|
MMU_NOTIFY_SOFT_DIRTY, |
|
MMU_NOTIFY_RELEASE, |
|
MMU_NOTIFY_MIGRATE, |
|
}; |
|
|
|
#define MMU_NOTIFIER_RANGE_BLOCKABLE (1 << 0) |
|
|
|
struct mmu_notifier_ops { |
|
/* |
|
* Called either by mmu_notifier_unregister or when the mm is |
|
* being destroyed by exit_mmap, always before all pages are |
|
* freed. This can run concurrently with other mmu notifier |
|
* methods (the ones invoked outside the mm context) and it |
|
* should tear down all secondary mmu mappings and freeze the |
|
* secondary mmu. If this method isn't implemented you've to |
|
* be sure that nothing could possibly write to the pages |
|
* through the secondary mmu by the time the last thread with |
|
* tsk->mm == mm exits. |
|
* |
|
* As side note: the pages freed after ->release returns could |
|
* be immediately reallocated by the gart at an alias physical |
|
* address with a different cache model, so if ->release isn't |
|
* implemented because all _software_ driven memory accesses |
|
* through the secondary mmu are terminated by the time the |
|
* last thread of this mm quits, you've also to be sure that |
|
* speculative _hardware_ operations can't allocate dirty |
|
* cachelines in the cpu that could not be snooped and made |
|
* coherent with the other read and write operations happening |
|
* through the gart alias address, so leading to memory |
|
* corruption. |
|
*/ |
|
void (*release)(struct mmu_notifier *subscription, |
|
struct mm_struct *mm); |
|
|
|
/* |
|
* clear_flush_young is called after the VM is |
|
* test-and-clearing the young/accessed bitflag in the |
|
* pte. This way the VM will provide proper aging to the |
|
* accesses to the page through the secondary MMUs and not |
|
* only to the ones through the Linux pte. |
|
* Start-end is necessary in case the secondary MMU is mapping the page |
|
* at a smaller granularity than the primary MMU. |
|
*/ |
|
int (*clear_flush_young)(struct mmu_notifier *subscription, |
|
struct mm_struct *mm, |
|
unsigned long start, |
|
unsigned long end); |
|
|
|
/* |
|
* clear_young is a lightweight version of clear_flush_young. Like the |
|
* latter, it is supposed to test-and-clear the young/accessed bitflag |
|
* in the secondary pte, but it may omit flushing the secondary tlb. |
|
*/ |
|
int (*clear_young)(struct mmu_notifier *subscription, |
|
struct mm_struct *mm, |
|
unsigned long start, |
|
unsigned long end); |
|
|
|
/* |
|
* test_young is called to check the young/accessed bitflag in |
|
* the secondary pte. This is used to know if the page is |
|
* frequently used without actually clearing the flag or tearing |
|
* down the secondary mapping on the page. |
|
*/ |
|
int (*test_young)(struct mmu_notifier *subscription, |
|
struct mm_struct *mm, |
|
unsigned long address); |
|
|
|
/* |
|
* change_pte is called in cases that pte mapping to page is changed: |
|
* for example, when ksm remaps pte to point to a new shared page. |
|
*/ |
|
void (*change_pte)(struct mmu_notifier *subscription, |
|
struct mm_struct *mm, |
|
unsigned long address, |
|
pte_t pte); |
|
|
|
/* |
|
* invalidate_range_start() and invalidate_range_end() must be |
|
* paired and are called only when the mmap_lock and/or the |
|
* locks protecting the reverse maps are held. If the subsystem |
|
* can't guarantee that no additional references are taken to |
|
* the pages in the range, it has to implement the |
|
* invalidate_range() notifier to remove any references taken |
|
* after invalidate_range_start(). |
|
* |
|
* Invalidation of multiple concurrent ranges may be |
|
* optionally permitted by the driver. Either way the |
|
* establishment of sptes is forbidden in the range passed to |
|
* invalidate_range_begin/end for the whole duration of the |
|
* invalidate_range_begin/end critical section. |
|
* |
|
* invalidate_range_start() is called when all pages in the |
|
* range are still mapped and have at least a refcount of one. |
|
* |
|
* invalidate_range_end() is called when all pages in the |
|
* range have been unmapped and the pages have been freed by |
|
* the VM. |
|
* |
|
* The VM will remove the page table entries and potentially |
|
* the page between invalidate_range_start() and |
|
* invalidate_range_end(). If the page must not be freed |
|
* because of pending I/O or other circumstances then the |
|
* invalidate_range_start() callback (or the initial mapping |
|
* by the driver) must make sure that the refcount is kept |
|
* elevated. |
|
* |
|
* If the driver increases the refcount when the pages are |
|
* initially mapped into an address space then either |
|
* invalidate_range_start() or invalidate_range_end() may |
|
* decrease the refcount. If the refcount is decreased on |
|
* invalidate_range_start() then the VM can free pages as page |
|
* table entries are removed. If the refcount is only |
|
* droppped on invalidate_range_end() then the driver itself |
|
* will drop the last refcount but it must take care to flush |
|
* any secondary tlb before doing the final free on the |
|
* page. Pages will no longer be referenced by the linux |
|
* address space but may still be referenced by sptes until |
|
* the last refcount is dropped. |
|
* |
|
* If blockable argument is set to false then the callback cannot |
|
* sleep and has to return with -EAGAIN if sleeping would be required. |
|
* 0 should be returned otherwise. Please note that notifiers that can |
|
* fail invalidate_range_start are not allowed to implement |
|
* invalidate_range_end, as there is no mechanism for informing the |
|
* notifier that its start failed. |
|
*/ |
|
int (*invalidate_range_start)(struct mmu_notifier *subscription, |
|
const struct mmu_notifier_range *range); |
|
void (*invalidate_range_end)(struct mmu_notifier *subscription, |
|
const struct mmu_notifier_range *range); |
|
|
|
/* |
|
* invalidate_range() is either called between |
|
* invalidate_range_start() and invalidate_range_end() when the |
|
* VM has to free pages that where unmapped, but before the |
|
* pages are actually freed, or outside of _start()/_end() when |
|
* a (remote) TLB is necessary. |
|
* |
|
* If invalidate_range() is used to manage a non-CPU TLB with |
|
* shared page-tables, it not necessary to implement the |
|
* invalidate_range_start()/end() notifiers, as |
|
* invalidate_range() alread catches the points in time when an |
|
* external TLB range needs to be flushed. For more in depth |
|
* discussion on this see Documentation/vm/mmu_notifier.rst |
|
* |
|
* Note that this function might be called with just a sub-range |
|
* of what was passed to invalidate_range_start()/end(), if |
|
* called between those functions. |
|
*/ |
|
void (*invalidate_range)(struct mmu_notifier *subscription, |
|
struct mm_struct *mm, |
|
unsigned long start, |
|
unsigned long end); |
|
|
|
/* |
|
* These callbacks are used with the get/put interface to manage the |
|
* lifetime of the mmu_notifier memory. alloc_notifier() returns a new |
|
* notifier for use with the mm. |
|
* |
|
* free_notifier() is only called after the mmu_notifier has been |
|
* fully put, calls to any ops callback are prevented and no ops |
|
* callbacks are currently running. It is called from a SRCU callback |
|
* and cannot sleep. |
|
*/ |
|
struct mmu_notifier *(*alloc_notifier)(struct mm_struct *mm); |
|
void (*free_notifier)(struct mmu_notifier *subscription); |
|
}; |
|
|
|
/* |
|
* The notifier chains are protected by mmap_lock and/or the reverse map |
|
* semaphores. Notifier chains are only changed when all reverse maps and |
|
* the mmap_lock locks are taken. |
|
* |
|
* Therefore notifier chains can only be traversed when either |
|
* |
|
* 1. mmap_lock is held. |
|
* 2. One of the reverse map locks is held (i_mmap_rwsem or anon_vma->rwsem). |
|
* 3. No other concurrent thread can access the list (release) |
|
*/ |
|
struct mmu_notifier { |
|
struct hlist_node hlist; |
|
const struct mmu_notifier_ops *ops; |
|
struct mm_struct *mm; |
|
struct rcu_head rcu; |
|
unsigned int users; |
|
}; |
|
|
|
/** |
|
* struct mmu_interval_notifier_ops |
|
* @invalidate: Upon return the caller must stop using any SPTEs within this |
|
* range. This function can sleep. Return false only if sleeping |
|
* was required but mmu_notifier_range_blockable(range) is false. |
|
*/ |
|
struct mmu_interval_notifier_ops { |
|
bool (*invalidate)(struct mmu_interval_notifier *interval_sub, |
|
const struct mmu_notifier_range *range, |
|
unsigned long cur_seq); |
|
}; |
|
|
|
struct mmu_interval_notifier { |
|
struct interval_tree_node interval_tree; |
|
const struct mmu_interval_notifier_ops *ops; |
|
struct mm_struct *mm; |
|
struct hlist_node deferred_item; |
|
unsigned long invalidate_seq; |
|
}; |
|
|
|
#ifdef CONFIG_MMU_NOTIFIER |
|
|
|
#ifdef CONFIG_LOCKDEP |
|
extern struct lockdep_map __mmu_notifier_invalidate_range_start_map; |
|
#endif |
|
|
|
struct mmu_notifier_range { |
|
struct vm_area_struct *vma; |
|
struct mm_struct *mm; |
|
unsigned long start; |
|
unsigned long end; |
|
unsigned flags; |
|
enum mmu_notifier_event event; |
|
void *migrate_pgmap_owner; |
|
}; |
|
|
|
static inline int mm_has_notifiers(struct mm_struct *mm) |
|
{ |
|
return unlikely(mm->notifier_subscriptions); |
|
} |
|
|
|
struct mmu_notifier *mmu_notifier_get_locked(const struct mmu_notifier_ops *ops, |
|
struct mm_struct *mm); |
|
static inline struct mmu_notifier * |
|
mmu_notifier_get(const struct mmu_notifier_ops *ops, struct mm_struct *mm) |
|
{ |
|
struct mmu_notifier *ret; |
|
|
|
mmap_write_lock(mm); |
|
ret = mmu_notifier_get_locked(ops, mm); |
|
mmap_write_unlock(mm); |
|
return ret; |
|
} |
|
void mmu_notifier_put(struct mmu_notifier *subscription); |
|
void mmu_notifier_synchronize(void); |
|
|
|
extern int mmu_notifier_register(struct mmu_notifier *subscription, |
|
struct mm_struct *mm); |
|
extern int __mmu_notifier_register(struct mmu_notifier *subscription, |
|
struct mm_struct *mm); |
|
extern void mmu_notifier_unregister(struct mmu_notifier *subscription, |
|
struct mm_struct *mm); |
|
|
|
unsigned long |
|
mmu_interval_read_begin(struct mmu_interval_notifier *interval_sub); |
|
int mmu_interval_notifier_insert(struct mmu_interval_notifier *interval_sub, |
|
struct mm_struct *mm, unsigned long start, |
|
unsigned long length, |
|
const struct mmu_interval_notifier_ops *ops); |
|
int mmu_interval_notifier_insert_locked( |
|
struct mmu_interval_notifier *interval_sub, struct mm_struct *mm, |
|
unsigned long start, unsigned long length, |
|
const struct mmu_interval_notifier_ops *ops); |
|
void mmu_interval_notifier_remove(struct mmu_interval_notifier *interval_sub); |
|
|
|
/** |
|
* mmu_interval_set_seq - Save the invalidation sequence |
|
* @interval_sub - The subscription passed to invalidate |
|
* @cur_seq - The cur_seq passed to the invalidate() callback |
|
* |
|
* This must be called unconditionally from the invalidate callback of a |
|
* struct mmu_interval_notifier_ops under the same lock that is used to call |
|
* mmu_interval_read_retry(). It updates the sequence number for later use by |
|
* mmu_interval_read_retry(). The provided cur_seq will always be odd. |
|
* |
|
* If the caller does not call mmu_interval_read_begin() or |
|
* mmu_interval_read_retry() then this call is not required. |
|
*/ |
|
static inline void |
|
mmu_interval_set_seq(struct mmu_interval_notifier *interval_sub, |
|
unsigned long cur_seq) |
|
{ |
|
WRITE_ONCE(interval_sub->invalidate_seq, cur_seq); |
|
} |
|
|
|
/** |
|
* mmu_interval_read_retry - End a read side critical section against a VA range |
|
* interval_sub: The subscription |
|
* seq: The return of the paired mmu_interval_read_begin() |
|
* |
|
* This MUST be called under a user provided lock that is also held |
|
* unconditionally by op->invalidate() when it calls mmu_interval_set_seq(). |
|
* |
|
* Each call should be paired with a single mmu_interval_read_begin() and |
|
* should be used to conclude the read side. |
|
* |
|
* Returns true if an invalidation collided with this critical section, and |
|
* the caller should retry. |
|
*/ |
|
static inline bool |
|
mmu_interval_read_retry(struct mmu_interval_notifier *interval_sub, |
|
unsigned long seq) |
|
{ |
|
return interval_sub->invalidate_seq != seq; |
|
} |
|
|
|
/** |
|
* mmu_interval_check_retry - Test if a collision has occurred |
|
* interval_sub: The subscription |
|
* seq: The return of the matching mmu_interval_read_begin() |
|
* |
|
* This can be used in the critical section between mmu_interval_read_begin() |
|
* and mmu_interval_read_retry(). A return of true indicates an invalidation |
|
* has collided with this critical region and a future |
|
* mmu_interval_read_retry() will return true. |
|
* |
|
* False is not reliable and only suggests a collision may not have |
|
* occured. It can be called many times and does not have to hold the user |
|
* provided lock. |
|
* |
|
* This call can be used as part of loops and other expensive operations to |
|
* expedite a retry. |
|
*/ |
|
static inline bool |
|
mmu_interval_check_retry(struct mmu_interval_notifier *interval_sub, |
|
unsigned long seq) |
|
{ |
|
/* Pairs with the WRITE_ONCE in mmu_interval_set_seq() */ |
|
return READ_ONCE(interval_sub->invalidate_seq) != seq; |
|
} |
|
|
|
extern void __mmu_notifier_subscriptions_destroy(struct mm_struct *mm); |
|
extern void __mmu_notifier_release(struct mm_struct *mm); |
|
extern int __mmu_notifier_clear_flush_young(struct mm_struct *mm, |
|
unsigned long start, |
|
unsigned long end); |
|
extern int __mmu_notifier_clear_young(struct mm_struct *mm, |
|
unsigned long start, |
|
unsigned long end); |
|
extern int __mmu_notifier_test_young(struct mm_struct *mm, |
|
unsigned long address); |
|
extern void __mmu_notifier_change_pte(struct mm_struct *mm, |
|
unsigned long address, pte_t pte); |
|
extern int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *r); |
|
extern void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *r, |
|
bool only_end); |
|
extern void __mmu_notifier_invalidate_range(struct mm_struct *mm, |
|
unsigned long start, unsigned long end); |
|
extern bool |
|
mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range); |
|
|
|
static inline bool |
|
mmu_notifier_range_blockable(const struct mmu_notifier_range *range) |
|
{ |
|
return (range->flags & MMU_NOTIFIER_RANGE_BLOCKABLE); |
|
} |
|
|
|
static inline void mmu_notifier_release(struct mm_struct *mm) |
|
{ |
|
if (mm_has_notifiers(mm)) |
|
__mmu_notifier_release(mm); |
|
} |
|
|
|
static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm, |
|
unsigned long start, |
|
unsigned long end) |
|
{ |
|
if (mm_has_notifiers(mm)) |
|
return __mmu_notifier_clear_flush_young(mm, start, end); |
|
return 0; |
|
} |
|
|
|
static inline int mmu_notifier_clear_young(struct mm_struct *mm, |
|
unsigned long start, |
|
unsigned long end) |
|
{ |
|
if (mm_has_notifiers(mm)) |
|
return __mmu_notifier_clear_young(mm, start, end); |
|
return 0; |
|
} |
|
|
|
static inline int mmu_notifier_test_young(struct mm_struct *mm, |
|
unsigned long address) |
|
{ |
|
if (mm_has_notifiers(mm)) |
|
return __mmu_notifier_test_young(mm, address); |
|
return 0; |
|
} |
|
|
|
static inline void mmu_notifier_change_pte(struct mm_struct *mm, |
|
unsigned long address, pte_t pte) |
|
{ |
|
if (mm_has_notifiers(mm)) |
|
__mmu_notifier_change_pte(mm, address, pte); |
|
} |
|
|
|
static inline void |
|
mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range) |
|
{ |
|
might_sleep(); |
|
|
|
lock_map_acquire(&__mmu_notifier_invalidate_range_start_map); |
|
if (mm_has_notifiers(range->mm)) { |
|
range->flags |= MMU_NOTIFIER_RANGE_BLOCKABLE; |
|
__mmu_notifier_invalidate_range_start(range); |
|
} |
|
lock_map_release(&__mmu_notifier_invalidate_range_start_map); |
|
} |
|
|
|
static inline int |
|
mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range) |
|
{ |
|
int ret = 0; |
|
|
|
lock_map_acquire(&__mmu_notifier_invalidate_range_start_map); |
|
if (mm_has_notifiers(range->mm)) { |
|
range->flags &= ~MMU_NOTIFIER_RANGE_BLOCKABLE; |
|
ret = __mmu_notifier_invalidate_range_start(range); |
|
} |
|
lock_map_release(&__mmu_notifier_invalidate_range_start_map); |
|
return ret; |
|
} |
|
|
|
static inline void |
|
mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range) |
|
{ |
|
if (mmu_notifier_range_blockable(range)) |
|
might_sleep(); |
|
|
|
if (mm_has_notifiers(range->mm)) |
|
__mmu_notifier_invalidate_range_end(range, false); |
|
} |
|
|
|
static inline void |
|
mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range) |
|
{ |
|
if (mm_has_notifiers(range->mm)) |
|
__mmu_notifier_invalidate_range_end(range, true); |
|
} |
|
|
|
static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, |
|
unsigned long start, unsigned long end) |
|
{ |
|
if (mm_has_notifiers(mm)) |
|
__mmu_notifier_invalidate_range(mm, start, end); |
|
} |
|
|
|
static inline void mmu_notifier_subscriptions_init(struct mm_struct *mm) |
|
{ |
|
mm->notifier_subscriptions = NULL; |
|
} |
|
|
|
static inline void mmu_notifier_subscriptions_destroy(struct mm_struct *mm) |
|
{ |
|
if (mm_has_notifiers(mm)) |
|
__mmu_notifier_subscriptions_destroy(mm); |
|
} |
|
|
|
|
|
static inline void mmu_notifier_range_init(struct mmu_notifier_range *range, |
|
enum mmu_notifier_event event, |
|
unsigned flags, |
|
struct vm_area_struct *vma, |
|
struct mm_struct *mm, |
|
unsigned long start, |
|
unsigned long end) |
|
{ |
|
range->vma = vma; |
|
range->event = event; |
|
range->mm = mm; |
|
range->start = start; |
|
range->end = end; |
|
range->flags = flags; |
|
} |
|
|
|
static inline void mmu_notifier_range_init_migrate( |
|
struct mmu_notifier_range *range, unsigned int flags, |
|
struct vm_area_struct *vma, struct mm_struct *mm, |
|
unsigned long start, unsigned long end, void *pgmap) |
|
{ |
|
mmu_notifier_range_init(range, MMU_NOTIFY_MIGRATE, flags, vma, mm, |
|
start, end); |
|
range->migrate_pgmap_owner = pgmap; |
|
} |
|
|
|
#define ptep_clear_flush_young_notify(__vma, __address, __ptep) \ |
|
({ \ |
|
int __young; \ |
|
struct vm_area_struct *___vma = __vma; \ |
|
unsigned long ___address = __address; \ |
|
__young = ptep_clear_flush_young(___vma, ___address, __ptep); \ |
|
__young |= mmu_notifier_clear_flush_young(___vma->vm_mm, \ |
|
___address, \ |
|
___address + \ |
|
PAGE_SIZE); \ |
|
__young; \ |
|
}) |
|
|
|
#define pmdp_clear_flush_young_notify(__vma, __address, __pmdp) \ |
|
({ \ |
|
int __young; \ |
|
struct vm_area_struct *___vma = __vma; \ |
|
unsigned long ___address = __address; \ |
|
__young = pmdp_clear_flush_young(___vma, ___address, __pmdp); \ |
|
__young |= mmu_notifier_clear_flush_young(___vma->vm_mm, \ |
|
___address, \ |
|
___address + \ |
|
PMD_SIZE); \ |
|
__young; \ |
|
}) |
|
|
|
#define ptep_clear_young_notify(__vma, __address, __ptep) \ |
|
({ \ |
|
int __young; \ |
|
struct vm_area_struct *___vma = __vma; \ |
|
unsigned long ___address = __address; \ |
|
__young = ptep_test_and_clear_young(___vma, ___address, __ptep);\ |
|
__young |= mmu_notifier_clear_young(___vma->vm_mm, ___address, \ |
|
___address + PAGE_SIZE); \ |
|
__young; \ |
|
}) |
|
|
|
#define pmdp_clear_young_notify(__vma, __address, __pmdp) \ |
|
({ \ |
|
int __young; \ |
|
struct vm_area_struct *___vma = __vma; \ |
|
unsigned long ___address = __address; \ |
|
__young = pmdp_test_and_clear_young(___vma, ___address, __pmdp);\ |
|
__young |= mmu_notifier_clear_young(___vma->vm_mm, ___address, \ |
|
___address + PMD_SIZE); \ |
|
__young; \ |
|
}) |
|
|
|
#define ptep_clear_flush_notify(__vma, __address, __ptep) \ |
|
({ \ |
|
unsigned long ___addr = __address & PAGE_MASK; \ |
|
struct mm_struct *___mm = (__vma)->vm_mm; \ |
|
pte_t ___pte; \ |
|
\ |
|
___pte = ptep_clear_flush(__vma, __address, __ptep); \ |
|
mmu_notifier_invalidate_range(___mm, ___addr, \ |
|
___addr + PAGE_SIZE); \ |
|
\ |
|
___pte; \ |
|
}) |
|
|
|
#define pmdp_huge_clear_flush_notify(__vma, __haddr, __pmd) \ |
|
({ \ |
|
unsigned long ___haddr = __haddr & HPAGE_PMD_MASK; \ |
|
struct mm_struct *___mm = (__vma)->vm_mm; \ |
|
pmd_t ___pmd; \ |
|
\ |
|
___pmd = pmdp_huge_clear_flush(__vma, __haddr, __pmd); \ |
|
mmu_notifier_invalidate_range(___mm, ___haddr, \ |
|
___haddr + HPAGE_PMD_SIZE); \ |
|
\ |
|
___pmd; \ |
|
}) |
|
|
|
#define pudp_huge_clear_flush_notify(__vma, __haddr, __pud) \ |
|
({ \ |
|
unsigned long ___haddr = __haddr & HPAGE_PUD_MASK; \ |
|
struct mm_struct *___mm = (__vma)->vm_mm; \ |
|
pud_t ___pud; \ |
|
\ |
|
___pud = pudp_huge_clear_flush(__vma, __haddr, __pud); \ |
|
mmu_notifier_invalidate_range(___mm, ___haddr, \ |
|
___haddr + HPAGE_PUD_SIZE); \ |
|
\ |
|
___pud; \ |
|
}) |
|
|
|
/* |
|
* set_pte_at_notify() sets the pte _after_ running the notifier. |
|
* This is safe to start by updating the secondary MMUs, because the primary MMU |
|
* pte invalidate must have already happened with a ptep_clear_flush() before |
|
* set_pte_at_notify() has been invoked. Updating the secondary MMUs first is |
|
* required when we change both the protection of the mapping from read-only to |
|
* read-write and the pfn (like during copy on write page faults). Otherwise the |
|
* old page would remain mapped readonly in the secondary MMUs after the new |
|
* page is already writable by some CPU through the primary MMU. |
|
*/ |
|
#define set_pte_at_notify(__mm, __address, __ptep, __pte) \ |
|
({ \ |
|
struct mm_struct *___mm = __mm; \ |
|
unsigned long ___address = __address; \ |
|
pte_t ___pte = __pte; \ |
|
\ |
|
mmu_notifier_change_pte(___mm, ___address, ___pte); \ |
|
set_pte_at(___mm, ___address, __ptep, ___pte); \ |
|
}) |
|
|
|
#else /* CONFIG_MMU_NOTIFIER */ |
|
|
|
struct mmu_notifier_range { |
|
unsigned long start; |
|
unsigned long end; |
|
}; |
|
|
|
static inline void _mmu_notifier_range_init(struct mmu_notifier_range *range, |
|
unsigned long start, |
|
unsigned long end) |
|
{ |
|
range->start = start; |
|
range->end = end; |
|
} |
|
|
|
#define mmu_notifier_range_init(range,event,flags,vma,mm,start,end) \ |
|
_mmu_notifier_range_init(range, start, end) |
|
#define mmu_notifier_range_init_migrate(range, flags, vma, mm, start, end, \ |
|
pgmap) \ |
|
_mmu_notifier_range_init(range, start, end) |
|
|
|
static inline bool |
|
mmu_notifier_range_blockable(const struct mmu_notifier_range *range) |
|
{ |
|
return true; |
|
} |
|
|
|
static inline int mm_has_notifiers(struct mm_struct *mm) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline void mmu_notifier_release(struct mm_struct *mm) |
|
{ |
|
} |
|
|
|
static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm, |
|
unsigned long start, |
|
unsigned long end) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int mmu_notifier_test_young(struct mm_struct *mm, |
|
unsigned long address) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline void mmu_notifier_change_pte(struct mm_struct *mm, |
|
unsigned long address, pte_t pte) |
|
{ |
|
} |
|
|
|
static inline void |
|
mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range) |
|
{ |
|
} |
|
|
|
static inline int |
|
mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline |
|
void mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range) |
|
{ |
|
} |
|
|
|
static inline void |
|
mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range) |
|
{ |
|
} |
|
|
|
static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, |
|
unsigned long start, unsigned long end) |
|
{ |
|
} |
|
|
|
static inline void mmu_notifier_subscriptions_init(struct mm_struct *mm) |
|
{ |
|
} |
|
|
|
static inline void mmu_notifier_subscriptions_destroy(struct mm_struct *mm) |
|
{ |
|
} |
|
|
|
#define mmu_notifier_range_update_to_read_only(r) false |
|
|
|
#define ptep_clear_flush_young_notify ptep_clear_flush_young |
|
#define pmdp_clear_flush_young_notify pmdp_clear_flush_young |
|
#define ptep_clear_young_notify ptep_test_and_clear_young |
|
#define pmdp_clear_young_notify pmdp_test_and_clear_young |
|
#define ptep_clear_flush_notify ptep_clear_flush |
|
#define pmdp_huge_clear_flush_notify pmdp_huge_clear_flush |
|
#define pudp_huge_clear_flush_notify pudp_huge_clear_flush |
|
#define set_pte_at_notify set_pte_at |
|
|
|
static inline void mmu_notifier_synchronize(void) |
|
{ |
|
} |
|
|
|
#endif /* CONFIG_MMU_NOTIFIER */ |
|
|
|
#endif /* _LINUX_MMU_NOTIFIER_H */
|
|
|