2
0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-25 05:34:00 +08:00
linux-next/include/linux/mmu_notifier.h
Linus Torvalds 988adfdffd Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
Pull drm updates from Dave Airlie:
 "Highlights:

   - AMD KFD driver merge

     This is the AMD HSA interface for exposing a lowlevel interface for
     GPGPU use.  They have an open source userspace built on top of this
     interface, and the code looks as good as it was going to get out of
     tree.

   - Initial atomic modesetting work

     The need for an atomic modesetting interface to allow userspace to
     try and send a complete set of modesetting state to the driver has
     arisen, and been suffering from neglect this past year.  No more,
     the start of the common code and changes for msm driver to use it
     are in this tree.  Ongoing work to get the userspace ioctl finished
     and the code clean will probably wait until next kernel.

   - DisplayID 1.3 and tiled monitor exposed to userspace.

     Tiled monitor property is now exposed for userspace to make use of.

   - Rockchip drm driver merged.

   - imx gpu driver moved out of staging

  Other stuff:

   - core:
        panel - MIPI DSI + new panels.
        expose suggested x/y properties for virtual GPUs

   - i915:
        Initial Skylake (SKL) support
        gen3/4 reset work
        start of dri1/ums removal
        infoframe tracking
        fixes for lots of things.

   - nouveau:
        tegra k1 voltage support
        GM204 modesetting support
        GT21x memory reclocking work

   - radeon:
        CI dpm fixes
        GPUVM improvements
        Initial DPM fan control

   - rcar-du:
        HDMI support added
        removed some support for old boards
        slave encoder driver for Analog Devices adv7511

   - exynos:
        Exynos4415 SoC support

   - msm:
        a4xx gpu support
        atomic helper conversion

   - tegra:
        iommu support
        universal plane support
        ganged-mode DSI support

   - sti:
        HDMI i2c improvements

   - vmwgfx:
        some late fixes.

   - qxl:
        use suggested x/y properties"

* 'drm-next' of git://people.freedesktop.org/~airlied/linux: (969 commits)
  drm: sti: fix module compilation issue
  drm/i915: save/restore GMBUS freq across suspend/resume on gen4
  drm: sti: correctly cleanup CRTC and planes
  drm: sti: add HQVDP plane
  drm: sti: add cursor plane
  drm: sti: enable auxiliary CRTC
  drm: sti: fix delay in VTG programming
  drm: sti: prepare sti_tvout to support auxiliary crtc
  drm: sti: use drm_crtc_vblank_{on/off} instead of drm_vblank_{on/off}
  drm: sti: fix hdmi avi infoframe
  drm: sti: remove event lock while disabling vblank
  drm: sti: simplify gdp code
  drm: sti: clear all mixer control
  drm: sti: remove gpio for HDMI hot plug detection
  drm: sti: allow to change hdmi ddc i2c adapter
  drm/doc: Document drm_add_modes_noedid() usage
  drm/i915: Remove '& 0xffff' from the mask given to WA_REG()
  drm/i915: Invert the mask and val arguments in wa_add() and WA_REG()
  drm: Zero out DRM object memory upon cleanup
  drm/i915/bdw: Fix the write setting up the WIZ hashing mode
  ...
2014-12-15 15:52:01 -08:00

438 lines
14 KiB
C

#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/srcu.h>
struct mmu_notifier;
struct mmu_notifier_ops;
#ifdef CONFIG_MMU_NOTIFIER
/*
* The mmu notifier_mm structure is allocated and installed in
* mm->mmu_notifier_mm inside the mm_take_all_locks() protected
* critical section and it's released only when mm_count reaches zero
* in mmdrop().
*/
struct mmu_notifier_mm {
/* all mmu notifiers registerd in this mm are queued in this list */
struct hlist_head list;
/* to serialize the list modifications and hlist_unhashed */
spinlock_t lock;
};
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 *mn,
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 *mn,
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 *mn,
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 *mn,
struct mm_struct *mm,
unsigned long address,
pte_t pte);
/*
* Before this is invoked any secondary MMU is still ok to
* read/write to the page previously pointed to by the Linux
* pte because the page hasn't been freed yet and it won't be
* freed until this returns. If required set_page_dirty has to
* be called internally to this method.
*/
void (*invalidate_page)(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long address);
/*
* invalidate_range_start() and invalidate_range_end() must be
* paired and are called only when the mmap_sem 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.
*/
void (*invalidate_range_start)(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long start, unsigned long end);
void (*invalidate_range_end)(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long start, unsigned long end);
/*
* 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.
*
* The invalidate_range() function is called under the ptl
* spin-lock and not allowed to sleep.
*
* 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 *mn, struct mm_struct *mm,
unsigned long start, unsigned long end);
};
/*
* The notifier chains are protected by mmap_sem and/or the reverse map
* semaphores. Notifier chains are only changed when all reverse maps and
* the mmap_sem locks are taken.
*
* Therefore notifier chains can only be traversed when either
*
* 1. mmap_sem 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;
};
static inline int mm_has_notifiers(struct mm_struct *mm)
{
return unlikely(mm->mmu_notifier_mm);
}
extern int mmu_notifier_register(struct mmu_notifier *mn,
struct mm_struct *mm);
extern int __mmu_notifier_register(struct mmu_notifier *mn,
struct mm_struct *mm);
extern void mmu_notifier_unregister(struct mmu_notifier *mn,
struct mm_struct *mm);
extern void mmu_notifier_unregister_no_release(struct mmu_notifier *mn,
struct mm_struct *mm);
extern void __mmu_notifier_mm_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_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 void __mmu_notifier_invalidate_page(struct mm_struct *mm,
unsigned long address);
extern void __mmu_notifier_invalidate_range_start(struct mm_struct *mm,
unsigned long start, unsigned long end);
extern void __mmu_notifier_invalidate_range_end(struct mm_struct *mm,
unsigned long start, unsigned long end);
extern void __mmu_notifier_invalidate_range(struct mm_struct *mm,
unsigned long start, unsigned long end);
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_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_page(struct mm_struct *mm,
unsigned long address)
{
if (mm_has_notifiers(mm))
__mmu_notifier_invalidate_page(mm, address);
}
static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
if (mm_has_notifiers(mm))
__mmu_notifier_invalidate_range_start(mm, start, end);
}
static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
if (mm_has_notifiers(mm))
__mmu_notifier_invalidate_range_end(mm, start, end);
}
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_mm_init(struct mm_struct *mm)
{
mm->mmu_notifier_mm = NULL;
}
static inline void mmu_notifier_mm_destroy(struct mm_struct *mm)
{
if (mm_has_notifiers(mm))
__mmu_notifier_mm_destroy(mm);
}
#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_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_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_clear_flush(__vma, __haddr, __pmd); \
mmu_notifier_invalidate_range(___mm, ___haddr, \
___haddr + HPAGE_PMD_SIZE); \
\
___pmd; \
})
#define pmdp_get_and_clear_notify(__mm, __haddr, __pmd) \
({ \
unsigned long ___haddr = __haddr & HPAGE_PMD_MASK; \
pmd_t ___pmd; \
\
___pmd = pmdp_get_and_clear(__mm, __haddr, __pmd); \
mmu_notifier_invalidate_range(__mm, ___haddr, \
___haddr + HPAGE_PMD_SIZE); \
\
___pmd; \
})
/*
* 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); \
})
extern void mmu_notifier_call_srcu(struct rcu_head *rcu,
void (*func)(struct rcu_head *rcu));
extern void mmu_notifier_synchronize(void);
#else /* CONFIG_MMU_NOTIFIER */
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_page(struct mm_struct *mm,
unsigned long address)
{
}
static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
}
static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
}
static inline void mmu_notifier_invalidate_range(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
}
static inline void mmu_notifier_mm_init(struct mm_struct *mm)
{
}
static inline void mmu_notifier_mm_destroy(struct mm_struct *mm)
{
}
#define ptep_clear_flush_young_notify ptep_clear_flush_young
#define pmdp_clear_flush_young_notify pmdp_clear_flush_young
#define ptep_clear_flush_notify ptep_clear_flush
#define pmdp_clear_flush_notify pmdp_clear_flush
#define pmdp_get_and_clear_notify pmdp_get_and_clear
#define set_pte_at_notify set_pte_at
#endif /* CONFIG_MMU_NOTIFIER */
#endif /* _LINUX_MMU_NOTIFIER_H */