[Intel-gfx] [RFC PATCH v3 13/17] drm/i915/vm_bind: userptr dma-resv changes

[Andi Shyti <andi.shyti@linux.intel.com>]

From: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>

For persistent (vm_bind) vmas of userptr BOs, handle the user
page pinning by using the i915_gem_object_userptr_submit_init()
/done() functions

Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer3.c   | 139 ++++++++++++++----
 drivers/gpu/drm/i915/gem/i915_gem_userptr.c   |  10 ++
 .../drm/i915/gem/i915_gem_vm_bind_object.c    |  16 ++
 drivers/gpu/drm/i915/gt/intel_gtt.c           |   2 +
 drivers/gpu/drm/i915/gt/intel_gtt.h           |   4 +
 drivers/gpu/drm/i915/i915_vma_types.h         |   2 +
 6 files changed, 142 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer3.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer3.c
index 8e0dde26194e0..72d6771da2113 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer3.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer3.c
@@ -23,6 +23,7 @@
 #include "i915_gem_vm_bind.h"
 #include "i915_trace.h"
 
+#define __EXEC3_USERPTR_USED		BIT_ULL(34)
 #define __EXEC3_HAS_PIN			BIT_ULL(33)
 #define __EXEC3_ENGINE_PINNED		BIT_ULL(32)
 #define __EXEC3_INTERNAL_FLAGS		(~0ull << 32)
@@ -157,10 +158,45 @@ static void eb_scoop_unbound_vma_all(struct i915_address_space *vm)
 	spin_unlock(&vm->vm_rebind_lock);
 }
 
+static int eb_lookup_persistent_userptr_vmas(struct i915_execbuffer *eb)
+{
+	struct i915_address_space *vm = eb->context->vm;
+	struct i915_vma *last_vma = NULL;
+	struct i915_vma *vma;
+	int err;
+
+	lockdep_assert_held(&vm->vm_bind_lock);
+
+	list_for_each_entry(vma, &vm->vm_userptr_invalidated_list,
+			    vm_userptr_invalidated_link) {
+		list_del_init(&vma->vm_userptr_invalidated_link);
+		err = i915_gem_object_userptr_submit_init(vma->obj);
+		if (err)
+			return err;
+
+		last_vma = vma;
+	}
+
+	list_for_each_entry(vma, &vm->vm_bind_list, vm_bind_link)
+		if (i915_gem_object_is_userptr(vma->obj)) {
+			err = i915_gem_object_userptr_submit_init(vma->obj);
+			if (err)
+				return err;
+
+			last_vma = vma;
+		}
+
+	if (last_vma)
+		eb->args->flags |= __EXEC3_USERPTR_USED;
+
+	return 0;
+}
+
 static int eb_lookup_vma_all(struct i915_execbuffer *eb)
 {
 	unsigned int i, current_batch = 0;
 	struct i915_vma *vma;
+	int err = 0;
 
 	for (i = 0; i < eb->num_batches; i++) {
 		vma = eb_find_vma(eb->context->vm, eb->batch_addresses[i]);
@@ -171,6 +207,10 @@ static int eb_lookup_vma_all(struct i915_execbuffer *eb)
 		++current_batch;
 	}
 
+	err = eb_lookup_persistent_userptr_vmas(eb);
+	if (err)
+		return err;
+
 	eb_scoop_unbound_vma_all(eb->context->vm);
 
 	return 0;
@@ -286,33 +326,6 @@ static int eb_validate_persistent_vma_all(struct i915_execbuffer *eb)
 	return ret;
 }
 
-static int eb_validate_vma_all(struct i915_execbuffer *eb)
-{
-	/* only throttle once, even if we didn't need to throttle */
-	for (bool throttle = true;; throttle = false) {
-		int err;
-
-		err = eb_pin_engine(eb, throttle);
-		if (!err)
-			err = eb_lock_vma_all(eb);
-
-		if (!err)
-			err = eb_validate_persistent_vma_all(eb);
-
-		if (!err)
-			return 0;
-
-		if (err != -EDEADLK)
-			return err;
-
-		err = i915_gem_ww_ctx_backoff(&eb->ww);
-		if (err)
-			return err;
-	}
-
-	return 0;
-}
-
 /*
  * Using two helper loops for the order of which requests / batches are created
  * and added the to backend. Requests are created in order from the parent to
@@ -360,15 +373,51 @@ static void eb_move_all_persistent_vma_to_active(struct i915_execbuffer *eb)
 
 static int eb_move_to_gpu(struct i915_execbuffer *eb)
 {
+	int err = 0, j;
+
 	lockdep_assert_held(&eb->context->vm->vm_bind_lock);
 	assert_object_held(eb->context->vm->root_obj);
 
 	eb_move_all_persistent_vma_to_active(eb);
 
-	/* Unconditionally flush any chipset caches (for streaming writes). */
-	intel_gt_chipset_flush(eb->gt);
+#ifdef CONFIG_MMU_NOTIFIER
+	if (!err && (eb->args->flags & __EXEC3_USERPTR_USED)) {
+		struct i915_vma *vma;
 
-	return 0;
+		lockdep_assert_held(&eb->context->vm->vm_bind_lock);
+		assert_object_held(eb->context->vm->root_obj);
+
+		read_lock(&eb->i915->mm.notifier_lock);
+		list_for_each_entry(vma, &eb->context->vm->vm_bind_list,
+				    vm_bind_link) {
+			if (!i915_gem_object_is_userptr(vma->obj))
+				continue;
+
+			err = i915_gem_object_userptr_submit_done(vma->obj);
+			if (err)
+				break;
+		}
+
+		read_unlock(&eb->i915->mm.notifier_lock);
+	}
+#endif
+
+	if (likely(!err)) {
+		/* 
+		 * Unconditionally flush any
+		 * chipset caches (for streaming writes).
+		 */
+		intel_gt_chipset_flush(eb->gt);
+		return 0;
+	}
+
+	for_each_batch_create_order(eb, j) {
+		if (!eb->requests[j])
+			break;
+
+		i915_request_set_error_once(eb->requests[j], err);
+	}
+	return err;
 }
 
 static int eb_request_submit(struct i915_execbuffer *eb,
@@ -1088,6 +1137,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 {
 	struct drm_i915_private *i915 = to_i915(dev);
 	struct i915_execbuffer eb;
+	bool throttle = true;
 	int err;
 
 	BUILD_BUG_ON(__EXEC3_INTERNAL_FLAGS & ~__I915_EXEC3_UNKNOWN_FLAGS);
@@ -1121,6 +1171,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 
 	mutex_lock(&eb.context->vm->vm_bind_lock);
 
+lookup_vmas:
 	err = eb_lookup_vma_all(&eb);
 	if (err) {
 		eb_release_vma_all(&eb, true);
@@ -1129,7 +1180,33 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 
 	i915_gem_ww_ctx_init(&eb.ww, true);
 
-	err = eb_validate_vma_all(&eb);
+retry_validate:
+	err = eb_pin_engine(&eb, throttle);
+	if (err)
+		goto err_validate;
+
+	/* only throttle once, even if we didn't need to throttle */
+	throttle = false;
+
+	err = eb_lock_vma_all(&eb);
+	if (err)
+		goto err_validate;
+
+	if (!list_empty(&eb.context->vm->vm_rebind_list)) {
+		eb_release_vma_all(&eb, true);
+		i915_gem_ww_ctx_fini(&eb.ww);
+		goto lookup_vmas;
+	}
+
+	err = eb_validate_persistent_vma_all(&eb);
+
+err_validate:
+	if (err == -EDEADLK) {
+		eb_release_vma_all(&eb, false);
+		err = i915_gem_ww_ctx_backoff(&eb.ww);
+		if (!err)
+			goto retry_validate;
+	}
 	if (err)
 		goto err_vma;
 
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
index 8423df021b713..f980d7443fa27 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
@@ -63,6 +63,7 @@ static bool i915_gem_userptr_invalidate(struct mmu_interval_notifier *mni,
 {
 	struct drm_i915_gem_object *obj = container_of(mni, struct drm_i915_gem_object, userptr.notifier);
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	struct i915_vma *vma;
 	long r;
 
 	if (!mmu_notifier_range_blockable(range))
@@ -85,6 +86,15 @@ static bool i915_gem_userptr_invalidate(struct mmu_interval_notifier *mni,
 	if (current->flags & PF_EXITING)
 		return true;
 
+	spin_lock(&obj->vma.lock);
+	list_for_each_entry(vma, &obj->vma.list, obj_link) {
+		spin_lock(&vma->vm->vm_userptr_invalidated_lock);
+		list_add_tail(&vma->vm_userptr_invalidated_link,
+			      &vma->vm->vm_userptr_invalidated_list);
+		spin_unlock(&vma->vm->vm_userptr_invalidated_lock);
+	}
+	spin_unlock(&obj->vma.lock);
+
 	/* we will unbind on next submission, still have userptr pins */
 	r = dma_resv_wait_timeout(obj->base.resv, DMA_RESV_USAGE_BOOKKEEP, false,
 				  MAX_SCHEDULE_TIMEOUT);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
index e57b9c492a7f9..e6216f49e7d58 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_vm_bind_object.c
@@ -296,6 +296,12 @@ static int i915_gem_vm_bind_obj(struct i915_address_space *vm,
 		goto put_obj;
 	}
 
+	if (i915_gem_object_is_userptr(obj)) {
+		ret = i915_gem_object_userptr_submit_init(obj);
+		if (ret)
+			goto put_obj;
+	}
+
 	ret = mutex_lock_interruptible(&vm->vm_bind_lock);
 	if (ret)
 		goto put_obj;
@@ -328,6 +334,16 @@ static int i915_gem_vm_bind_obj(struct i915_address_space *vm,
 		/* Make it evictable */
 		__i915_vma_unpin(vma);
 
+#ifdef CONFIG_MMU_NOTIFIER
+		if (i915_gem_object_is_userptr(obj)) {
+			read_lock(&vm->i915->mm.notifier_lock);
+			ret = i915_gem_object_userptr_submit_done(obj);
+			read_unlock(&vm->i915->mm.notifier_lock);
+			if (ret)
+				goto out_ww;
+		}
+#endif
+
 		list_add_tail(&vma->vm_bind_link, &vm->vm_bound_list);
 		i915_vm_bind_it_insert(vma, &vm->va);
 		if (!obj->priv_root)
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c
index 97cd0089b516d..f1db8310de4a6 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.c
@@ -298,6 +298,8 @@ void i915_address_space_init(struct i915_address_space *vm, int subclass)
 	GEM_BUG_ON(IS_ERR(vm->root_obj));
 	INIT_LIST_HEAD(&vm->vm_rebind_list);
 	spin_lock_init(&vm->vm_rebind_lock);
+	spin_lock_init(&vm->vm_userptr_invalidated_lock);
+	INIT_LIST_HEAD(&vm->vm_userptr_invalidated_list);
 }
 
 void *__px_vaddr(struct drm_i915_gem_object *p)
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.h b/drivers/gpu/drm/i915/gt/intel_gtt.h
index 1f3b1967ec175..71203d65e1d60 100644
--- a/drivers/gpu/drm/i915/gt/intel_gtt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gtt.h
@@ -269,6 +269,10 @@ struct i915_address_space {
 	struct list_head vm_rebind_list;
 	/* @vm_rebind_lock: protects vm_rebound_list */
 	spinlock_t vm_rebind_lock;
+	/* @vm_userptr_invalidated_list: list of invalidated userptr vmas */
+	struct list_head vm_userptr_invalidated_list;
+	/* @vm_userptr_invalidated_lock: protects vm_userptr_invalidated_list */
+	spinlock_t vm_userptr_invalidated_lock;
 	/* @va: tree of persistent vmas */
 	struct rb_root_cached va;
 	struct list_head non_priv_vm_bind_list;
diff --git a/drivers/gpu/drm/i915/i915_vma_types.h b/drivers/gpu/drm/i915/i915_vma_types.h
index 8bf870a0f689b..5b583ca744387 100644
--- a/drivers/gpu/drm/i915/i915_vma_types.h
+++ b/drivers/gpu/drm/i915/i915_vma_types.h
@@ -317,6 +317,8 @@ struct i915_vma {
 	struct list_head non_priv_vm_bind_link;
 	/* @vm_rebind_link: link to vm_rebind_list and protected by vm_rebind_lock */
 	struct list_head vm_rebind_link; /* Link in vm_rebind_list */
+	/*@vm_userptr_invalidated_link: link to the vm->vm_userptr_invalidated_list */
+	struct list_head vm_userptr_invalidated_link;
 
 	/** Timeline fence for vm_bind completion notification */
 	struct {
-- 
2.34.1