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mm/hmm: invalidate device page table at start of invalidation 

Invalidate device page table at start of invalidation and invalidate in
progress CPU page table snapshooting at both start and end of any
invalidation.

This is helpful when device need to dirty page because the device page
table report the page as dirty.  Dirtying page must happen in the start
mmu notifier callback and not in the end one.

Link: http://lkml.kernel.org/r/20181019160442.18723-7-jglisse@redhat.com
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jérôme Glisse 2018-10-30 15:04:28 -07:00 committed by Linus Torvalds
parent 44532d4c59
commit ec131b2d7f
1 changed files with 15 additions and 12 deletions
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19
mm/hmm.c
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@ -43,7 +43,6 @@ static const struct mmu_notifier_ops hmm_mmu_notifier_ops;
*
* @mm: mm struct this HMM struct is bound to
* @lock: lock protecting ranges list
* @sequence: we track updates to the CPU page table with a sequence number
* @ranges: list of range being snapshotted
* @mirrors: list of mirrors for this mm
* @mmu_notifier: mmu notifier to track updates to CPU page table
@ -52,7 +51,6 @@ static const struct mmu_notifier_ops hmm_mmu_notifier_ops;
struct hmm {
struct mm_struct *mm;
spinlock_t lock;
atomic_t sequence;
struct list_head ranges;
struct list_head mirrors;
struct mmu_notifier mmu_notifier;
@ -85,7 +83,6 @@ static struct hmm *hmm_register(struct mm_struct *mm)
return NULL;
INIT_LIST_HEAD(&hmm->mirrors);
init_rwsem(&hmm->mirrors_sem);
atomic_set(&hmm->sequence, 0);
hmm->mmu_notifier.ops = NULL;
INIT_LIST_HEAD(&hmm->ranges);
spin_lock_init(&hmm->lock);
@ -126,7 +123,7 @@ void hmm_mm_destroy(struct mm_struct *mm)
kfree(mm->hmm);
}
static int hmm_invalidate_range(struct hmm *hmm,
static int hmm_invalidate_range(struct hmm *hmm, bool device,
const struct hmm_update *update)
{
struct hmm_mirror *mirror;
@ -147,6 +144,9 @@ static int hmm_invalidate_range(struct hmm *hmm,
}
spin_unlock(&hmm->lock);
if (!device)
return 0;
down_read(&hmm->mirrors_sem);
list_for_each_entry(mirror, &hmm->mirrors, list) {
int ret;
@ -194,13 +194,16 @@ static int hmm_invalidate_range_start(struct mmu_notifier *mn,
unsigned long end,
bool blockable)
{
struct hmm_update update;
struct hmm *hmm = mm->hmm;
VM_BUG_ON(!hmm);
atomic_inc(&hmm->sequence);
return 0;
update.start = start;
update.end = end;
update.event = HMM_UPDATE_INVALIDATE;
update.blockable = blockable;
return hmm_invalidate_range(hmm, true, &update);
}
static void hmm_invalidate_range_end(struct mmu_notifier *mn,
@ -217,7 +220,7 @@ static void hmm_invalidate_range_end(struct mmu_notifier *mn,
update.end = end;
update.event = HMM_UPDATE_INVALIDATE;
update.blockable = true;
hmm_invalidate_range(hmm, &update);
hmm_invalidate_range(hmm, false, &update);
}
static const struct mmu_notifier_ops hmm_mmu_notifier_ops = {