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[PATCH v12 24/29] HMM: allow to get pointer to spinlock protecting a directory.

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Several use case for getting pointer to spinlock protecting a directory.

Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
---
 include/linux/hmm_pt.h | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/include/linux/hmm_pt.h b/include/linux/hmm_pt.h
index f745d6c..22100a6 100644
--- a/include/linux/hmm_pt.h
+++ b/include/linux/hmm_pt.h
@@ -255,6 +255,16 @@ static inline void hmm_pt_directory_lock(struct hmm_pt *pt,
 		spin_lock(&pt->lock);
 }
 
+static inline spinlock_t *hmm_pt_directory_lock_ptr(struct hmm_pt *pt,
+						    struct page *ptd,
+						    unsigned level)
+{
+	if (level)
+		return &ptd->ptl;
+	else
+		return &pt->lock;
+}
+
 static inline void hmm_pt_directory_unlock(struct hmm_pt *pt,
 					   struct page *ptd,
 					   unsigned level)
@@ -272,6 +282,13 @@ static inline void hmm_pt_directory_lock(struct hmm_pt *pt,
 	spin_lock(&pt->lock);
 }
 
+static inline spinlock_t *hmm_pt_directory_lock_ptr(struct hmm_pt *pt,
+						    struct page *ptd,
+						    unsigned level)
+{
+	return &pt->lock;
+}
+
 static inline void hmm_pt_directory_unlock(struct hmm_pt *pt,
 					   struct page *ptd,
 					   unsigned level)
@@ -358,6 +375,14 @@ static inline void hmm_pt_iter_directory_lock(struct hmm_pt_iter *iter)
 	hmm_pt_directory_lock(pt, iter->ptd[pt->llevel - 1], pt->llevel);
 }
 
+static inline spinlock_t *hmm_pt_iter_directory_lock_ptr(struct hmm_pt_iter *i)
+{
+	struct hmm_pt *pt = i->pt;
+
+	return hmm_pt_directory_lock_ptr(pt, i->ptd[pt->llevel - 1],
+					 pt->llevel);
+}
+
 static inline void hmm_pt_iter_directory_unlock(struct hmm_pt_iter *iter)
 {
 	struct hmm_pt *pt = iter->pt;
-- 
2.4.3

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HMM (Heterogeneous Memory Management) Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 11/29] HMM: add discard range helper (to clear and free resources for a range). Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 19/29] HMM: add new HMM page table flag (select flag). Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 03/29] mmu_notifier: pass page pointer to mmu_notifier_invalidate_page() v2 Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 05/29] HMM: introduce heterogeneous memory management v5. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 06/29] HMM: add HMM page table v4. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 10/29] HMM: use CPU page table during invalidation. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 29/29] HMM: add mirror fault support for system to device memory migration v3. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 24/29] HMM: allow to get pointer to spinlock protecting a directory. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 07/29] HMM: add per mirror page table v4. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 15/29] HMM: add documentation explaining HMM internals and how to use it. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 17/29] HMM: add special swap filetype for memory migrated to device v2. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 21/29] HMM: mm add helper to update page table when migrating memory back v2. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 20:50 +0100
  [PATCH v12 23/29] HMM: new callback for copying memory from and to device memory v2. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 21:00 +0100
  [PATCH v12 13/29] HMM: DMA map memory on behalf of device driver v2. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 21:00 +0100
  [PATCH v12 14/29] HMM: Add support for hugetlb. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 21:00 +0100
  [PATCH v12 28/29] HMM: CPU page fault on migrated memory. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 21:00 +0100
  [PATCH v12 26/29] HMM: add helpers for migration back to system memory v3. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 21:00 +0100
  [PATCH v12 25/29] HMM: split DMA mapping function in two. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 21:00 +0100
  [PATCH v12 08/29] HMM: add device page fault support v6. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 21:00 +0100
  [PATCH v12 18/29] HMM: add new HMM page table flag (valid device memory). Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 21:00 +0100
  [PATCH v12 12/29] HMM: add dirty range helper (toggle dirty bit inside mirror page table) v2. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 21:00 +0100
  [PATCH v12 20/29] HMM: handle HMM device page table entry on mirror page table fault and update. Jérôme Glisse <jglisse@redhat.com> - 2016-03-08 21:00 +0100

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