[PATCH 1/3] drm/amdgpu: use HMM mirror callback to replace mmu notifier v6

["Yang, Philip" <Philip.Yang-5C7GfCeVMHo@public.gmane.org>]

Replace our MMU notifier with hmm_mirror_ops.sync_cpu_device_pagetables
callback. Enable CONFIG_HMM and CONFIG_HMM_MIRROR as a dependency in
DRM_AMDGPU_USERPTR Kconfig.

It supports both KFD userptr and gfx userptr paths.

The depdent HMM patchset from Jérôme Glisse are all merged into 4.20.0
kernel now.

Change-Id: Ie62c3c5e3c5b8521ab3b438d1eff2aa2a003835e
Signed-off-by: Philip Yang <Philip.Yang@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/Kconfig     |   6 +-
 drivers/gpu/drm/amd/amdgpu/Makefile    |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 122 ++++++++++---------------
 drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h |   2 +-
 4 files changed, 55 insertions(+), 77 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/Kconfig b/drivers/gpu/drm/amd/amdgpu/Kconfig
index 9221e5489069..960a63355705 100644
--- a/drivers/gpu/drm/amd/amdgpu/Kconfig
+++ b/drivers/gpu/drm/amd/amdgpu/Kconfig
@@ -26,10 +26,10 @@ config DRM_AMDGPU_CIK
 config DRM_AMDGPU_USERPTR
 	bool "Always enable userptr write support"
 	depends on DRM_AMDGPU
-	select MMU_NOTIFIER
+	select HMM_MIRROR
 	help
-	  This option selects CONFIG_MMU_NOTIFIER if it isn't already
-	  selected to enabled full userptr support.
+	  This option selects CONFIG_HMM and CONFIG_HMM_MIRROR if it
+	  isn't already selected to enabled full userptr support.
 
 config DRM_AMDGPU_GART_DEBUGFS
 	bool "Allow GART access through debugfs"
diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index f76bcb9c45e4..675efc850ff4 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -172,7 +172,7 @@ endif
 amdgpu-$(CONFIG_COMPAT) += amdgpu_ioc32.o
 amdgpu-$(CONFIG_VGA_SWITCHEROO) += amdgpu_atpx_handler.o
 amdgpu-$(CONFIG_ACPI) += amdgpu_acpi.o
-amdgpu-$(CONFIG_MMU_NOTIFIER) += amdgpu_mn.o
+amdgpu-$(CONFIG_HMM_MIRROR) += amdgpu_mn.o
 
 include $(FULL_AMD_PATH)/powerplay/Makefile
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
index e55508b39496..5d518d2bb9be 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
@@ -45,7 +45,7 @@
 
 #include <linux/firmware.h>
 #include <linux/module.h>
-#include <linux/mmu_notifier.h>
+#include <linux/hmm.h>
 #include <linux/interval_tree.h>
 #include <drm/drmP.h>
 #include <drm/drm.h>
@@ -58,7 +58,6 @@
  *
  * @adev: amdgpu device pointer
  * @mm: process address space
- * @mn: MMU notifier structure
  * @type: type of MMU notifier
  * @work: destruction work item
  * @node: hash table node to find structure by adev and mn
@@ -66,6 +65,7 @@
  * @objects: interval tree containing amdgpu_mn_nodes
  * @read_lock: mutex for recursive locking of @lock
  * @recursion: depth of recursion
+ * @mirror: HMM mirror function support
  *
  * Data for each amdgpu device and process address space.
  */
@@ -73,7 +73,6 @@ struct amdgpu_mn {
 	/* constant after initialisation */
 	struct amdgpu_device	*adev;
 	struct mm_struct	*mm;
-	struct mmu_notifier	mn;
 	enum amdgpu_mn_type	type;
 
 	/* only used on destruction */
@@ -87,6 +86,9 @@ struct amdgpu_mn {
 	struct rb_root_cached	objects;
 	struct mutex		read_lock;
 	atomic_t		recursion;
+
+	/* HMM mirror */
+	struct hmm_mirror	mirror;
 };
 
 /**
@@ -103,7 +105,7 @@ struct amdgpu_mn_node {
 };
 
 /**
- * amdgpu_mn_destroy - destroy the MMU notifier
+ * amdgpu_mn_destroy - destroy the HMM mirror
  *
  * @work: previously sheduled work item
  *
@@ -129,28 +131,26 @@ static void amdgpu_mn_destroy(struct work_struct *work)
 	}
 	up_write(&amn->lock);
 	mutex_unlock(&adev->mn_lock);
-	mmu_notifier_unregister_no_release(&amn->mn, amn->mm);
+
+	hmm_mirror_unregister(&amn->mirror);
 	kfree(amn);
 }
 
 /**
- * amdgpu_mn_release - callback to notify about mm destruction
+ * amdgpu_hmm_mirror_release - callback to notify about mm destruction
  *
- * @mn: our notifier
- * @mm: the mm this callback is about
+ * @mirror: the HMM mirror (mm) this callback is about
  *
- * Shedule a work item to lazy destroy our notifier.
+ * Shedule a work item to lazy destroy HMM mirror.
  */
-static void amdgpu_mn_release(struct mmu_notifier *mn,
-			      struct mm_struct *mm)
+static void amdgpu_hmm_mirror_release(struct hmm_mirror *mirror)
 {
-	struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
+	struct amdgpu_mn *amn = container_of(mirror, struct amdgpu_mn, mirror);
 
 	INIT_WORK(&amn->work, amdgpu_mn_destroy);
 	schedule_work(&amn->work);
 }
 
-
 /**
  * amdgpu_mn_lock - take the write side lock for this notifier
  *
@@ -237,21 +237,19 @@ static void amdgpu_mn_invalidate_node(struct amdgpu_mn_node *node,
 /**
  * amdgpu_mn_invalidate_range_start_gfx - callback to notify about mm change
  *
- * @mn: our notifier
- * @mm: the mm this callback is about
- * @start: start of updated range
- * @end: end of updated range
+ * @mirror: the hmm_mirror (mm) is about to update
+ * @update: the update start, end address
  *
  * Block for operations on BOs to finish and mark pages as accessed and
  * potentially dirty.
  */
-static int amdgpu_mn_invalidate_range_start_gfx(struct mmu_notifier *mn,
-						 struct mm_struct *mm,
-						 unsigned long start,
-						 unsigned long end,
-						 bool blockable)
+static int amdgpu_mn_sync_pagetables_gfx(struct hmm_mirror *mirror,
+			const struct hmm_update *update)
 {
-	struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
+	struct amdgpu_mn *amn = container_of(mirror, struct amdgpu_mn, mirror);
+	unsigned long start = update->start;
+	unsigned long end = update->end;
+	bool blockable = update->blockable;
 	struct interval_tree_node *it;
 
 	/* notification is exclusive, but interval is inclusive */
@@ -278,28 +276,28 @@ static int amdgpu_mn_invalidate_range_start_gfx(struct mmu_notifier *mn,
 		amdgpu_mn_invalidate_node(node, start, end);
 	}
 
+	amdgpu_mn_read_unlock(amn);
+
 	return 0;
 }
 
 /**
  * amdgpu_mn_invalidate_range_start_hsa - callback to notify about mm change
  *
- * @mn: our notifier
- * @mm: the mm this callback is about
- * @start: start of updated range
- * @end: end of updated range
+ * @mirror: the hmm_mirror (mm) is about to update
+ * @update: the update start, end address
  *
  * We temporarily evict all BOs between start and end. This
  * necessitates evicting all user-mode queues of the process. The BOs
  * are restorted in amdgpu_mn_invalidate_range_end_hsa.
  */
-static int amdgpu_mn_invalidate_range_start_hsa(struct mmu_notifier *mn,
-						 struct mm_struct *mm,
-						 unsigned long start,
-						 unsigned long end,
-						 bool blockable)
+static int amdgpu_mn_sync_pagetables_hsa(struct hmm_mirror *mirror,
+			const struct hmm_update *update)
 {
-	struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
+	struct amdgpu_mn *amn = container_of(mirror, struct amdgpu_mn, mirror);
+	unsigned long start = update->start;
+	unsigned long end = update->end;
+	bool blockable = update->blockable;
 	struct interval_tree_node *it;
 
 	/* notification is exclusive, but interval is inclusive */
@@ -326,59 +324,39 @@ static int amdgpu_mn_invalidate_range_start_hsa(struct mmu_notifier *mn,
 
 			if (amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm,
 							 start, end))
-				amdgpu_amdkfd_evict_userptr(mem, mm);
+				amdgpu_amdkfd_evict_userptr(mem, amn->mm);
 		}
 	}
 
+	amdgpu_mn_read_unlock(amn);
+
 	return 0;
 }
 
-/**
- * amdgpu_mn_invalidate_range_end - callback to notify about mm change
- *
- * @mn: our notifier
- * @mm: the mm this callback is about
- * @start: start of updated range
- * @end: end of updated range
- *
- * Release the lock again to allow new command submissions.
+/* Low bits of any reasonable mm pointer will be unused due to struct
+ * alignment. Use these bits to make a unique key from the mm pointer
+ * and notifier type.
  */
-static void amdgpu_mn_invalidate_range_end(struct mmu_notifier *mn,
-					   struct mm_struct *mm,
-					   unsigned long start,
-					   unsigned long end)
-{
-	struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
-
-	amdgpu_mn_read_unlock(amn);
-}
+#define AMDGPU_MN_KEY(mm, type) ((unsigned long)(mm) + (type))
 
-static const struct mmu_notifier_ops amdgpu_mn_ops[] = {
+static struct hmm_mirror_ops amdgpu_hmm_mirror_ops[] = {
 	[AMDGPU_MN_TYPE_GFX] = {
-		.release = amdgpu_mn_release,
-		.invalidate_range_start = amdgpu_mn_invalidate_range_start_gfx,
-		.invalidate_range_end = amdgpu_mn_invalidate_range_end,
+		.sync_cpu_device_pagetables = amdgpu_mn_sync_pagetables_gfx,
+		.release = amdgpu_hmm_mirror_release
 	},
 	[AMDGPU_MN_TYPE_HSA] = {
-		.release = amdgpu_mn_release,
-		.invalidate_range_start = amdgpu_mn_invalidate_range_start_hsa,
-		.invalidate_range_end = amdgpu_mn_invalidate_range_end,
+		.sync_cpu_device_pagetables = amdgpu_mn_sync_pagetables_hsa,
+		.release = amdgpu_hmm_mirror_release
 	},
 };
 
-/* Low bits of any reasonable mm pointer will be unused due to struct
- * alignment. Use these bits to make a unique key from the mm pointer
- * and notifier type.
- */
-#define AMDGPU_MN_KEY(mm, type) ((unsigned long)(mm) + (type))
-
 /**
- * amdgpu_mn_get - create notifier context
+ * amdgpu_mn_get - create HMM mirror context
  *
  * @adev: amdgpu device pointer
  * @type: type of MMU notifier context
  *
- * Creates a notifier context for current->mm.
+ * Creates a HMM mirror context for current->mm.
  */
 struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
 				enum amdgpu_mn_type type)
@@ -408,12 +386,12 @@ struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
 	amn->mm = mm;
 	init_rwsem(&amn->lock);
 	amn->type = type;
-	amn->mn.ops = &amdgpu_mn_ops[type];
 	amn->objects = RB_ROOT_CACHED;
 	mutex_init(&amn->read_lock);
 	atomic_set(&amn->recursion, 0);
 
-	r = __mmu_notifier_register(&amn->mn, mm);
+	amn->mirror.ops = &amdgpu_hmm_mirror_ops[type];
+	r = hmm_mirror_register(&amn->mirror, mm);
 	if (r)
 		goto free_amn;
 
@@ -439,7 +417,7 @@ struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
  * @bo: amdgpu buffer object
  * @addr: userptr addr we should monitor
  *
- * Registers an MMU notifier for the given BO at the specified address.
+ * Registers an HMM mirror for the given BO at the specified address.
  * Returns 0 on success, -ERRNO if anything goes wrong.
  */
 int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
@@ -495,11 +473,11 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
 }
 
 /**
- * amdgpu_mn_unregister - unregister a BO for notifier updates
+ * amdgpu_mn_unregister - unregister a BO for HMM mirror updates
  *
  * @bo: amdgpu buffer object
  *
- * Remove any registration of MMU notifier updates from the buffer object.
+ * Remove any registration of HMM mirror updates from the buffer object.
  */
 void amdgpu_mn_unregister(struct amdgpu_bo *bo)
 {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
index eb0f432f78fe..0a51fd00021c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
@@ -34,7 +34,7 @@ enum amdgpu_mn_type {
 	AMDGPU_MN_TYPE_HSA,
 };
 
-#if defined(CONFIG_MMU_NOTIFIER)
+#if defined(CONFIG_HMM_MIRROR)
 void amdgpu_mn_lock(struct amdgpu_mn *mn);
 void amdgpu_mn_unlock(struct amdgpu_mn *mn);
 struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
-- 
2.17.1

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