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mm/hmm: use a structure for update callback parameters

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Use a structure to gather all the parameters for the update callback.
This make it easier when adding new parameters by avoiding having to
update all callback function signature.

The hmm_update structure is always associated with a mmu_notifier
callbacks so we are not planing on grouping multiple updates together.
Nor do we care about page size for the range as range will over fully
cover the page being invalidated (this is a mmu_notifier property).

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Jérôme Glisse <[email protected]>
Cc: Ralph Campbell <[email protected]>
Cc: John Hubbard <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jérôme Glisse 2018-10-30 15:04:24 -07:00 • committed by Linus Torvalds
commit 44532d4c59
2 changed files with 44 additions and 20 deletions
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33
mm/hmm.c
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@ -126,10 +126,8 @@ void hmm_mm_destroy(struct mm_struct *mm)
kfree(mm->hmm);
}
static void hmm_invalidate_range(struct hmm *hmm,
enum hmm_update_type action,
unsigned long start,
unsigned long end)
static int hmm_invalidate_range(struct hmm *hmm,
const struct hmm_update *update)
{
struct hmm_mirror *mirror;
struct hmm_range *range;
@ -138,22 +136,30 @@ static void hmm_invalidate_range(struct hmm *hmm,
list_for_each_entry(range, &hmm->ranges, list) {
unsigned long addr, idx, npages;
if (end < range->start || start >= range->end)
if (update->end < range->start || update->start >= range->end)
continue;
range->valid = false;
addr = max(start, range->start);
addr = max(update->start, range->start);
idx = (addr - range->start) >> PAGE_SHIFT;
npages = (min(range->end, end) - addr) >> PAGE_SHIFT;
npages = (min(range->end, update->end) - addr) >> PAGE_SHIFT;
memset(&range->pfns[idx], 0, sizeof(*range->pfns) * npages);
}
spin_unlock(&hmm->lock);
down_read(&hmm->mirrors_sem);
list_for_each_entry(mirror, &hmm->mirrors, list)
mirror->ops->sync_cpu_device_pagetables(mirror, action,
start, end);
list_for_each_entry(mirror, &hmm->mirrors, list) {
int ret;
ret = mirror->ops->sync_cpu_device_pagetables(mirror, update);
if (!update->blockable && ret == -EAGAIN) {
up_read(&hmm->mirrors_sem);
return -EAGAIN;
}
}
up_read(&hmm->mirrors_sem);
return 0;
}
static void hmm_release(struct mmu_notifier *mn, struct mm_struct *mm)
@ -202,11 +208,16 @@ static void hmm_invalidate_range_end(struct mmu_notifier *mn,
unsigned long start,
unsigned long end)
{
struct hmm_update update;
struct hmm *hmm = mm->hmm;
VM_BUG_ON(!hmm);
hmm_invalidate_range(mm->hmm, HMM_UPDATE_INVALIDATE, start, end);
update.start = start;
update.end = end;
update.event = HMM_UPDATE_INVALIDATE;
update.blockable = true;
hmm_invalidate_range(hmm, &update);
}
static const struct mmu_notifier_ops hmm_mmu_notifier_ops = {