drm/i915: Pull kref into i915_address_space

Make the kref common to both derived structs (i915_ggtt and i915_ppgtt)
so that we can safely reference count an abstract ctx->vm address space.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190611091238.15808-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gem/i915_gem_client_blt.c

@@ -250,13 +250,11 @@ int i915_gem_schedule_fill_pages_blt(struct drm_i915_gem_object *obj,
 {
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
 	struct i915_gem_context *ctx = ce->gem_context;
-	struct i915_address_space *vm;
+	struct i915_address_space *vm = ctx->vm ?: &i915->ggtt.vm;
 	struct clear_pages_work *work;
 	struct i915_sleeve *sleeve;
 	int err;
 
-	vm = ctx->ppgtt ? &ctx->ppgtt->vm : &i915->ggtt.vm;
-
 	sleeve = create_sleeve(vm, obj, pages, page_sizes);
 	if (IS_ERR(sleeve))
 		return PTR_ERR(sleeve);

drivers/gpu/drm/i915/gem/i915_gem_context.c

@@ -309,7 +309,8 @@ static void i915_gem_context_free(struct i915_gem_context *ctx)
 	GEM_BUG_ON(!i915_gem_context_is_closed(ctx));
 
 	release_hw_id(ctx);
-	i915_ppgtt_put(ctx->ppgtt);
+	if (ctx->vm)
+		i915_vm_put(ctx->vm);
 
 	free_engines(rcu_access_pointer(ctx->engines));
 	mutex_destroy(&ctx->engines_mutex);
@@ -397,7 +398,7 @@ static void context_close(struct i915_gem_context *ctx)
 }
 
 static u32 default_desc_template(const struct drm_i915_private *i915,
-				 const struct i915_hw_ppgtt *ppgtt)
+				 const struct i915_address_space *vm)
 {
 	u32 address_mode;
 	u32 desc;
@@ -405,7 +406,7 @@ static u32 default_desc_template(const struct drm_i915_private *i915,
 	desc = GEN8_CTX_VALID | GEN8_CTX_PRIVILEGE;
 
 	address_mode = INTEL_LEGACY_32B_CONTEXT;
-	if (ppgtt && i915_vm_is_4lvl(&ppgtt->vm))
+	if (vm && i915_vm_is_4lvl(vm))
 		address_mode = INTEL_LEGACY_64B_CONTEXT;
 	desc |= address_mode << GEN8_CTX_ADDRESSING_MODE_SHIFT;
 
@@ -421,7 +422,7 @@ static u32 default_desc_template(const struct drm_i915_private *i915,
 }
 
 static struct i915_gem_context *
-__create_context(struct drm_i915_private *dev_priv)
+__create_context(struct drm_i915_private *i915)
 {
 	struct i915_gem_context *ctx;
 	struct i915_gem_engines *e;
@@ -433,8 +434,8 @@ __create_context(struct drm_i915_private *dev_priv)
 		return ERR_PTR(-ENOMEM);
 
 	kref_init(&ctx->ref);
-	list_add_tail(&ctx->link, &dev_priv->contexts.list);
-	ctx->i915 = dev_priv;
+	list_add_tail(&ctx->link, &i915->contexts.list);
+	ctx->i915 = i915;
 	ctx->sched.priority = I915_USER_PRIORITY(I915_PRIORITY_NORMAL);
 	mutex_init(&ctx->mutex);
 
@@ -452,14 +453,14 @@ __create_context(struct drm_i915_private *dev_priv)
 	/* NB: Mark all slices as needing a remap so that when the context first
 	 * loads it will restore whatever remap state already exists. If there
 	 * is no remap info, it will be a NOP. */
-	ctx->remap_slice = ALL_L3_SLICES(dev_priv);
+	ctx->remap_slice = ALL_L3_SLICES(i915);
 
 	i915_gem_context_set_bannable(ctx);
 	i915_gem_context_set_recoverable(ctx);
 
 	ctx->ring_size = 4 * PAGE_SIZE;
 	ctx->desc_template =
-		default_desc_template(dev_priv, dev_priv->mm.aliasing_ppgtt);
+		default_desc_template(i915, &i915->mm.aliasing_ppgtt->vm);
 
 	for (i = 0; i < ARRAY_SIZE(ctx->hang_timestamp); i++)
 		ctx->hang_timestamp[i] = jiffies - CONTEXT_FAST_HANG_JIFFIES;
@@ -471,26 +472,26 @@ __create_context(struct drm_i915_private *dev_priv)
 	return ERR_PTR(err);
 }
 
-static struct i915_hw_ppgtt *
-__set_ppgtt(struct i915_gem_context *ctx, struct i915_hw_ppgtt *ppgtt)
+static struct i915_address_space *
+__set_ppgtt(struct i915_gem_context *ctx, struct i915_address_space *vm)
 {
-	struct i915_hw_ppgtt *old = ctx->ppgtt;
+	struct i915_address_space *old = ctx->vm;
 
-	ctx->ppgtt = i915_ppgtt_get(ppgtt);
-	ctx->desc_template = default_desc_template(ctx->i915, ppgtt);
+	ctx->vm = i915_vm_get(vm);
+	ctx->desc_template = default_desc_template(ctx->i915, vm);
 
 	return old;
 }
 
 static void __assign_ppgtt(struct i915_gem_context *ctx,
-			   struct i915_hw_ppgtt *ppgtt)
+			   struct i915_address_space *vm)
 {
-	if (ppgtt == ctx->ppgtt)
+	if (vm == ctx->vm)
 		return;
 
-	ppgtt = __set_ppgtt(ctx, ppgtt);
-	if (ppgtt)
-		i915_ppgtt_put(ppgtt);
+	vm = __set_ppgtt(ctx, vm);
+	if (vm)
+		i915_vm_put(vm);
 }
 
 static struct i915_gem_context *
@@ -522,8 +523,8 @@ i915_gem_create_context(struct drm_i915_private *dev_priv, unsigned int flags)
 			return ERR_CAST(ppgtt);
 		}
 
-		__assign_ppgtt(ctx, ppgtt);
-		i915_ppgtt_put(ppgtt);
+		__assign_ppgtt(ctx, &ppgtt->vm);
+		i915_vm_put(&ppgtt->vm);
 	}
 
 	if (flags & I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE) {
@@ -723,7 +724,7 @@ static int context_idr_cleanup(int id, void *p, void *data)
 
 static int vm_idr_cleanup(int id, void *p, void *data)
 {
-	i915_ppgtt_put(p);
+	i915_vm_put(p);
 	return 0;
 }
 
@@ -733,8 +734,8 @@ static int gem_context_register(struct i915_gem_context *ctx,
 	int ret;
 
 	ctx->file_priv = fpriv;
-	if (ctx->ppgtt)
-		ctx->ppgtt->vm.file = fpriv;
+	if (ctx->vm)
+		ctx->vm->file = fpriv;
 
 	ctx->pid = get_task_pid(current, PIDTYPE_PID);
 	ctx->name = kasprintf(GFP_KERNEL, "%s[%d]",
@@ -844,7 +845,7 @@ int i915_gem_vm_create_ioctl(struct drm_device *dev, void *data,
 	if (err)
 		goto err_put;
 
-	err = idr_alloc(&file_priv->vm_idr, ppgtt, 0, 0, GFP_KERNEL);
+	err = idr_alloc(&file_priv->vm_idr, &ppgtt->vm, 0, 0, GFP_KERNEL);
 	if (err < 0)
 		goto err_unlock;
 
@@ -858,7 +859,7 @@ int i915_gem_vm_create_ioctl(struct drm_device *dev, void *data,
 err_unlock:
 	mutex_unlock(&file_priv->vm_idr_lock);
 err_put:
-	i915_ppgtt_put(ppgtt);
+	i915_vm_put(&ppgtt->vm);
 	return err;
 }
 
@@ -867,7 +868,7 @@ int i915_gem_vm_destroy_ioctl(struct drm_device *dev, void *data,
 {
 	struct drm_i915_file_private *file_priv = file->driver_priv;
 	struct drm_i915_gem_vm_control *args = data;
-	struct i915_hw_ppgtt *ppgtt;
+	struct i915_address_space *vm;
 	int err;
 	u32 id;
 
@@ -885,13 +886,13 @@ int i915_gem_vm_destroy_ioctl(struct drm_device *dev, void *data,
 	if (err)
 		return err;
 
-	ppgtt = idr_remove(&file_priv->vm_idr, id);
+	vm = idr_remove(&file_priv->vm_idr, id);
 
 	mutex_unlock(&file_priv->vm_idr_lock);
-	if (!ppgtt)
+	if (!vm)
 		return -ENOENT;
 
-	i915_ppgtt_put(ppgtt);
+	i915_vm_put(vm);
 	return 0;
 }
 
@@ -981,10 +982,10 @@ static int get_ppgtt(struct drm_i915_file_private *file_priv,
 		     struct i915_gem_context *ctx,
 		     struct drm_i915_gem_context_param *args)
 {
-	struct i915_hw_ppgtt *ppgtt;
+	struct i915_address_space *vm;
 	int ret;
 
-	if (!ctx->ppgtt)
+	if (!ctx->vm)
 		return -ENODEV;
 
 	/* XXX rcu acquire? */
@@ -992,19 +993,19 @@ static int get_ppgtt(struct drm_i915_file_private *file_priv,
 	if (ret)
 		return ret;
 
-	ppgtt = i915_ppgtt_get(ctx->ppgtt);
+	vm = i915_vm_get(ctx->vm);
 	mutex_unlock(&ctx->i915->drm.struct_mutex);
 
 	ret = mutex_lock_interruptible(&file_priv->vm_idr_lock);
 	if (ret)
 		goto err_put;
 
-	ret = idr_alloc(&file_priv->vm_idr, ppgtt, 0, 0, GFP_KERNEL);
+	ret = idr_alloc(&file_priv->vm_idr, vm, 0, 0, GFP_KERNEL);
 	GEM_BUG_ON(!ret);
 	if (ret < 0)
 		goto err_unlock;
 
-	i915_ppgtt_get(ppgtt);
+	i915_vm_get(vm);
 
 	args->size = 0;
 	args->value = ret;
@@ -1013,29 +1014,30 @@ static int get_ppgtt(struct drm_i915_file_private *file_priv,
 err_unlock:
 	mutex_unlock(&file_priv->vm_idr_lock);
 err_put:
-	i915_ppgtt_put(ppgtt);
+	i915_vm_put(vm);
 	return ret;
 }
 
 static void set_ppgtt_barrier(void *data)
 {
-	struct i915_hw_ppgtt *old = data;
+	struct i915_address_space *old = data;
 
-	if (INTEL_GEN(old->vm.i915) < 8)
-		gen6_ppgtt_unpin_all(old);
+	if (INTEL_GEN(old->i915) < 8)
+		gen6_ppgtt_unpin_all(i915_vm_to_ppgtt(old));
 
-	i915_ppgtt_put(old);
+	i915_vm_put(old);
 }
 
 static int emit_ppgtt_update(struct i915_request *rq, void *data)
 {
-	struct i915_hw_ppgtt *ppgtt = rq->gem_context->ppgtt;
+	struct i915_address_space *vm = rq->gem_context->vm;
 	struct intel_engine_cs *engine = rq->engine;
 	u32 base = engine->mmio_base;
 	u32 *cs;
 	int i;
 
-	if (i915_vm_is_4lvl(&ppgtt->vm)) {
+	if (i915_vm_is_4lvl(vm)) {
+		struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
 		const dma_addr_t pd_daddr = px_dma(&ppgtt->pml4);
 
 		cs = intel_ring_begin(rq, 6);
@@ -1052,6 +1054,8 @@ static int emit_ppgtt_update(struct i915_request *rq, void *data)
 		*cs++ = MI_NOOP;
 		intel_ring_advance(rq, cs);
 	} else if (HAS_LOGICAL_RING_CONTEXTS(engine->i915)) {
+		struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
+
 		cs = intel_ring_begin(rq, 4 * GEN8_3LVL_PDPES + 2);
 		if (IS_ERR(cs))
 			return PTR_ERR(cs);
@@ -1069,7 +1073,7 @@ static int emit_ppgtt_update(struct i915_request *rq, void *data)
 		intel_ring_advance(rq, cs);
 	} else {
 		/* ppGTT is not part of the legacy context image */
-		gen6_ppgtt_pin(ppgtt);
+		gen6_ppgtt_pin(i915_vm_to_ppgtt(vm));
 	}
 
 	return 0;
@@ -1087,13 +1091,13 @@ static int set_ppgtt(struct drm_i915_file_private *file_priv,
 		     struct i915_gem_context *ctx,
 		     struct drm_i915_gem_context_param *args)
 {
-	struct i915_hw_ppgtt *ppgtt, *old;
+	struct i915_address_space *vm, *old;
 	int err;
 
 	if (args->size)
 		return -EINVAL;
 
-	if (!ctx->ppgtt)
+	if (!ctx->vm)
 		return -ENODEV;
 
 	if (upper_32_bits(args->value))
@@ -1103,18 +1107,18 @@ static int set_ppgtt(struct drm_i915_file_private *file_priv,
 	if (err)
 		return err;
 
-	ppgtt = idr_find(&file_priv->vm_idr, args->value);
-	if (ppgtt)
-		i915_ppgtt_get(ppgtt);
+	vm = idr_find(&file_priv->vm_idr, args->value);
+	if (vm)
+		i915_vm_get(vm);
 	mutex_unlock(&file_priv->vm_idr_lock);
-	if (!ppgtt)
+	if (!vm)
 		return -ENOENT;
 
 	err = mutex_lock_interruptible(&ctx->i915->drm.struct_mutex);
 	if (err)
 		goto out;
 
-	if (ppgtt == ctx->ppgtt)
+	if (vm == ctx->vm)
 		goto unlock;
 
 	/* Teardown the existing obj:vma cache, it will have to be rebuilt. */
@@ -1122,7 +1126,7 @@ static int set_ppgtt(struct drm_i915_file_private *file_priv,
 	lut_close(ctx);
 	mutex_unlock(&ctx->mutex);
 
-	old = __set_ppgtt(ctx, ppgtt);
+	old = __set_ppgtt(ctx, vm);
 
 	/*
 	 * We need to flush any requests using the current ppgtt before
@@ -1135,16 +1139,16 @@ static int set_ppgtt(struct drm_i915_file_private *file_priv,
 				   set_ppgtt_barrier,
 				   old);
 	if (err) {
-		ctx->ppgtt = old;
+		ctx->vm = old;
 		ctx->desc_template = default_desc_template(ctx->i915, old);
-		i915_ppgtt_put(ppgtt);
+		i915_vm_put(vm);
 	}
 
 unlock:
 	mutex_unlock(&ctx->i915->drm.struct_mutex);
 
 out:
-	i915_ppgtt_put(ppgtt);
+	i915_vm_put(vm);
 	return err;
 }
 
@@ -2033,15 +2037,15 @@ static int clone_timeline(struct i915_gem_context *dst,
 static int clone_vm(struct i915_gem_context *dst,
 		    struct i915_gem_context *src)
 {
-	struct i915_hw_ppgtt *ppgtt;
+	struct i915_address_space *vm;
 
 	rcu_read_lock();
 	do {
-		ppgtt = READ_ONCE(src->ppgtt);
-		if (!ppgtt)
+		vm = READ_ONCE(src->vm);
+		if (!vm)
 			break;
 
-		if (!kref_get_unless_zero(&ppgtt->ref))
+		if (!kref_get_unless_zero(&vm->ref))
 			continue;
 
 		/*
@@ -2059,16 +2063,16 @@ static int clone_vm(struct i915_gem_context *dst,
 		 * it cannot be reallocated elsewhere.
 		 */
 
-		if (ppgtt == READ_ONCE(src->ppgtt))
+		if (vm == READ_ONCE(src->vm))
 			break;
 
-		i915_ppgtt_put(ppgtt);
+		i915_vm_put(vm);
 	} while (1);
 	rcu_read_unlock();
 
-	if (ppgtt) {
-		__assign_ppgtt(dst, ppgtt);
-		i915_ppgtt_put(ppgtt);
+	if (vm) {
+		__assign_ppgtt(dst, vm);
+		i915_vm_put(vm);
 	}
 
 	return 0;
@@ -2293,8 +2297,8 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
 
 	case I915_CONTEXT_PARAM_GTT_SIZE:
 		args->size = 0;
-		if (ctx->ppgtt)
-			args->value = ctx->ppgtt->vm.total;
+		if (ctx->vm)
+			args->value = ctx->vm->total;
 		else if (to_i915(dev)->mm.aliasing_ppgtt)
 			args->value = to_i915(dev)->mm.aliasing_ppgtt->vm.total;
 		else

drivers/gpu/drm/i915/gem/i915_gem_context_types.h

@@ -25,7 +25,7 @@ struct pid;
 
 struct drm_i915_private;
 struct drm_i915_file_private;
-struct i915_hw_ppgtt;
+struct i915_address_space;
 struct i915_timeline;
 struct intel_ring;
 
@@ -80,7 +80,7 @@ struct i915_gem_context {
 	struct i915_timeline *timeline;
 
 	/**
-	 * @ppgtt: unique address space (GTT)
+	 * @vm: unique address space (GTT)
 	 *
 	 * In full-ppgtt mode, each context has its own address space ensuring
 	 * complete seperation of one client from all others.
@@ -88,7 +88,7 @@ struct i915_gem_context {
 	 * In other modes, this is a NULL pointer with the expectation that
 	 * the caller uses the shared global GTT.
 	 */
-	struct i915_hw_ppgtt *ppgtt;
+	struct i915_address_space *vm;
 
 	/**
 	 * @pid: process id of creator

drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c

@@ -723,8 +723,8 @@ static int eb_select_context(struct i915_execbuffer *eb)
 		return -ENOENT;
 
 	eb->gem_context = ctx;
-	if (ctx->ppgtt) {
-		eb->vm = &ctx->ppgtt->vm;
+	if (ctx->vm) {
+		eb->vm = ctx->vm;
 		eb->invalid_flags |= EXEC_OBJECT_NEEDS_GTT;
 	} else {
 		eb->vm = &eb->i915->ggtt.vm;

drivers/gpu/drm/i915/gem/i915_gem_object_blt.c

@@ -49,14 +49,12 @@ int i915_gem_object_fill_blt(struct drm_i915_gem_object *obj,
 {
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
 	struct i915_gem_context *ctx = ce->gem_context;
-	struct i915_address_space *vm;
+	struct i915_address_space *vm = ctx->vm ?: &i915->ggtt.vm;
 	struct i915_request *rq;
 	struct i915_vma *vma;
 	int err;
 
 	/* XXX: ce->vm please */
-	vm = ctx->ppgtt ? &ctx->ppgtt->vm : &i915->ggtt.vm;
-
 	vma = i915_vma_instance(obj, vm, NULL);
 	if (IS_ERR(vma))
 		return PTR_ERR(vma);

drivers/gpu/drm/i915/gem/i915_gem_userptr.c

@@ -768,14 +768,14 @@ i915_gem_userptr_ioctl(struct drm_device *dev,
 		return -EFAULT;
 
 	if (args->flags & I915_USERPTR_READ_ONLY) {
-		struct i915_hw_ppgtt *ppgtt;
+		struct i915_address_space *vm;
 
 		/*
 		 * On almost all of the older hw, we cannot tell the GPU that
 		 * a page is readonly.
 		 */
-		ppgtt = dev_priv->kernel_context->ppgtt;
-		if (!ppgtt || !ppgtt->vm.has_read_only)
+		vm = dev_priv->kernel_context->vm;
+		if (!vm || !vm->has_read_only)
 			return -ENODEV;
 	}
 

drivers/gpu/drm/i915/gem/selftests/huge_pages.c

@@ -1038,8 +1038,7 @@ static int __igt_write_huge(struct i915_gem_context *ctx,
 			    u32 dword, u32 val)
 {
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
-	struct i915_address_space *vm =
-		ctx->ppgtt ? &ctx->ppgtt->vm : &i915->ggtt.vm;
+	struct i915_address_space *vm = ctx->vm ?: &i915->ggtt.vm;
 	unsigned int flags = PIN_USER | PIN_OFFSET_FIXED;
 	struct i915_vma *vma;
 	int err;
@@ -1092,8 +1091,7 @@ static int igt_write_huge(struct i915_gem_context *ctx,
 			  struct drm_i915_gem_object *obj)
 {
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
-	struct i915_address_space *vm =
-		ctx->ppgtt ? &ctx->ppgtt->vm : &i915->ggtt.vm;
+	struct i915_address_space *vm = ctx->vm ?: &i915->ggtt.vm;
 	static struct intel_engine_cs *engines[I915_NUM_ENGINES];
 	struct intel_engine_cs *engine;
 	I915_RND_STATE(prng);
@@ -1419,7 +1417,7 @@ static int igt_ppgtt_pin_update(void *arg)
 	struct i915_gem_context *ctx = arg;
 	struct drm_i915_private *dev_priv = ctx->i915;
 	unsigned long supported = INTEL_INFO(dev_priv)->page_sizes;
-	struct i915_hw_ppgtt *ppgtt = ctx->ppgtt;
+	struct i915_address_space *vm = ctx->vm;
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
 	unsigned int flags = PIN_USER | PIN_OFFSET_FIXED;
@@ -1434,7 +1432,7 @@ static int igt_ppgtt_pin_update(void *arg)
 	 * huge-gtt-pages.
 	 */
 
-	if (!ppgtt || !i915_vm_is_4lvl(&ppgtt->vm)) {
+	if (!vm || !i915_vm_is_4lvl(vm)) {
 		pr_info("48b PPGTT not supported, skipping\n");
 		return 0;
 	}
@@ -1449,7 +1447,7 @@ static int igt_ppgtt_pin_update(void *arg)
 		if (IS_ERR(obj))
 			return PTR_ERR(obj);
 
-		vma = i915_vma_instance(obj, &ppgtt->vm, NULL);
+		vma = i915_vma_instance(obj, vm, NULL);
 		if (IS_ERR(vma)) {
 			err = PTR_ERR(vma);
 			goto out_put;
@@ -1503,7 +1501,7 @@ static int igt_ppgtt_pin_update(void *arg)
 	if (IS_ERR(obj))
 		return PTR_ERR(obj);
 
-	vma = i915_vma_instance(obj, &ppgtt->vm, NULL);
+	vma = i915_vma_instance(obj, vm, NULL);
 	if (IS_ERR(vma)) {
 		err = PTR_ERR(vma);
 		goto out_put;
@@ -1541,8 +1539,7 @@ static int igt_tmpfs_fallback(void *arg)
 	struct i915_gem_context *ctx = arg;
 	struct drm_i915_private *i915 = ctx->i915;
 	struct vfsmount *gemfs = i915->mm.gemfs;
-	struct i915_address_space *vm =
-		ctx->ppgtt ? &ctx->ppgtt->vm : &i915->ggtt.vm;
+	struct i915_address_space *vm = ctx->vm ?: &i915->ggtt.vm;
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
 	u32 *vaddr;
@@ -1599,8 +1596,7 @@ static int igt_shrink_thp(void *arg)
 {
 	struct i915_gem_context *ctx = arg;
 	struct drm_i915_private *i915 = ctx->i915;
-	struct i915_address_space *vm =
-		ctx->ppgtt ? &ctx->ppgtt->vm : &i915->ggtt.vm;
+	struct i915_address_space *vm = ctx->vm ?: &i915->ggtt.vm;
 	struct drm_i915_gem_object *obj;
 	struct i915_vma *vma;
 	unsigned int flags = PIN_USER;
@@ -1721,7 +1717,7 @@ int i915_gem_huge_page_mock_selftests(void)
 	err = i915_subtests(tests, ppgtt);
 
 out_close:
-	i915_ppgtt_put(ppgtt);
+	i915_vm_put(&ppgtt->vm);
 
 out_unlock:
 	mutex_unlock(&dev_priv->drm.struct_mutex);
@@ -1766,8 +1762,8 @@ int i915_gem_huge_page_live_selftests(struct drm_i915_private *dev_priv)
 		goto out_unlock;
 	}
 
-	if (ctx->ppgtt)
-		ctx->ppgtt->vm.scrub_64K = true;
+	if (ctx->vm)
+		ctx->vm->scrub_64K = true;
 
 	err = i915_subtests(tests, ctx);
 

drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c

@@ -248,8 +248,7 @@ static int gpu_fill(struct drm_i915_gem_object *obj,
 		    unsigned int dw)
 {
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
-	struct i915_address_space *vm =
-		ctx->ppgtt ? &ctx->ppgtt->vm : &i915->ggtt.vm;
+	struct i915_address_space *vm = ctx->vm ?: &i915->ggtt.vm;
 	struct i915_request *rq;
 	struct i915_vma *vma;
 	struct i915_vma *batch;
@@ -438,8 +437,7 @@ create_test_object(struct i915_gem_context *ctx,
 		   struct list_head *objects)
 {
 	struct drm_i915_gem_object *obj;
-	struct i915_address_space *vm =
-		ctx->ppgtt ? &ctx->ppgtt->vm : &ctx->i915->ggtt.vm;
+	struct i915_address_space *vm = ctx->vm ?: &ctx->i915->ggtt.vm;
 	u64 size;
 	int err;
 
@@ -541,7 +539,7 @@ static int igt_ctx_exec(void *arg)
 				pr_err("Failed to fill dword %lu [%lu/%lu] with gpu (%s) in ctx %u [full-ppgtt? %s], err=%d\n",
 				       ndwords, dw, max_dwords(obj),
 				       engine->name, ctx->hw_id,
-				       yesno(!!ctx->ppgtt), err);
+				       yesno(!!ctx->vm), err);
 				goto out_unlock;
 			}
 
@@ -612,7 +610,7 @@ static int igt_shared_ctx_exec(void *arg)
 		goto out_unlock;
 	}
 
-	if (!parent->ppgtt) { /* not full-ppgtt; nothing to share */
+	if (!parent->vm) { /* not full-ppgtt; nothing to share */
 		err = 0;
 		goto out_unlock;
 	}
@@ -643,7 +641,7 @@ static int igt_shared_ctx_exec(void *arg)
 				goto out_test;
 			}
 
-			__assign_ppgtt(ctx, parent->ppgtt);
+			__assign_ppgtt(ctx, parent->vm);
 
 			if (!obj) {
 				obj = create_test_object(parent, file, &objects);
@@ -661,7 +659,7 @@ static int igt_shared_ctx_exec(void *arg)
 				pr_err("Failed to fill dword %lu [%lu/%lu] with gpu (%s) in ctx %u [full-ppgtt? %s], err=%d\n",
 				       ndwords, dw, max_dwords(obj),
 				       engine->name, ctx->hw_id,
-				       yesno(!!ctx->ppgtt), err);
+				       yesno(!!ctx->vm), err);
 				kernel_context_close(ctx);
 				goto out_test;
 			}
@@ -758,7 +756,7 @@ emit_rpcs_query(struct drm_i915_gem_object *obj,
 
 	GEM_BUG_ON(!intel_engine_can_store_dword(ce->engine));
 
-	vma = i915_vma_instance(obj, &ce->gem_context->ppgtt->vm, NULL);
+	vma = i915_vma_instance(obj, ce->gem_context->vm, NULL);
 	if (IS_ERR(vma))
 		return PTR_ERR(vma);
 
@@ -1176,8 +1174,8 @@ static int igt_ctx_readonly(void *arg)
 {
 	struct drm_i915_private *i915 = arg;
 	struct drm_i915_gem_object *obj = NULL;
+	struct i915_address_space *vm;
 	struct i915_gem_context *ctx;
-	struct i915_hw_ppgtt *ppgtt;
 	unsigned long idx, ndwords, dw;
 	struct igt_live_test t;
 	struct drm_file *file;
@@ -1208,8 +1206,8 @@ static int igt_ctx_readonly(void *arg)
 		goto out_unlock;
 	}
 
-	ppgtt = ctx->ppgtt ?: i915->mm.aliasing_ppgtt;
-	if (!ppgtt || !ppgtt->vm.has_read_only) {
+	vm = ctx->vm ?: &i915->mm.aliasing_ppgtt->vm;
+	if (!vm || !vm->has_read_only) {
 		err = 0;
 		goto out_unlock;
 	}
@@ -1244,7 +1242,7 @@ static int igt_ctx_readonly(void *arg)
 				pr_err("Failed to fill dword %lu [%lu/%lu] with gpu (%s) in ctx %u [full-ppgtt? %s], err=%d\n",
 				       ndwords, dw, max_dwords(obj),
 				       engine->name, ctx->hw_id,
-				       yesno(!!ctx->ppgtt), err);
+				       yesno(!!ctx->vm), err);
 				goto out_unlock;
 			}
 
@@ -1288,7 +1286,7 @@ static int igt_ctx_readonly(void *arg)
 static int check_scratch(struct i915_gem_context *ctx, u64 offset)
 {
 	struct drm_mm_node *node =
-		__drm_mm_interval_first(&ctx->ppgtt->vm.mm,
+		__drm_mm_interval_first(&ctx->vm->mm,
 					offset, offset + sizeof(u32) - 1);
 	if (!node || node->start > offset)
 		return 0;
@@ -1336,7 +1334,7 @@ static int write_to_scratch(struct i915_gem_context *ctx,
 	__i915_gem_object_flush_map(obj, 0, 64);
 	i915_gem_object_unpin_map(obj);
 
-	vma = i915_vma_instance(obj, &ctx->ppgtt->vm, NULL);
+	vma = i915_vma_instance(obj, ctx->vm, NULL);
 	if (IS_ERR(vma)) {
 		err = PTR_ERR(vma);
 		goto err;
@@ -1433,7 +1431,7 @@ static int read_from_scratch(struct i915_gem_context *ctx,
 	i915_gem_object_flush_map(obj);
 	i915_gem_object_unpin_map(obj);
 
-	vma = i915_vma_instance(obj, &ctx->ppgtt->vm, NULL);
+	vma = i915_vma_instance(obj, ctx->vm, NULL);
 	if (IS_ERR(vma)) {
 		err = PTR_ERR(vma);
 		goto err;
@@ -1542,11 +1540,11 @@ static int igt_vm_isolation(void *arg)
 	}
 
 	/* We can only test vm isolation, if the vm are distinct */
-	if (ctx_a->ppgtt == ctx_b->ppgtt)
+	if (ctx_a->vm == ctx_b->vm)
 		goto out_unlock;
 
-	vm_total = ctx_a->ppgtt->vm.total;
-	GEM_BUG_ON(ctx_b->ppgtt->vm.total != vm_total);
+	vm_total = ctx_a->vm->total;
+	GEM_BUG_ON(ctx_b->vm->total != vm_total);
 	vm_total -= I915_GTT_PAGE_SIZE;
 
 	wakeref = intel_runtime_pm_get(i915);

drivers/gpu/drm/i915/gem/selftests/mock_context.c

@@ -48,7 +48,8 @@ mock_context(struct drm_i915_private *i915,
 		if (!ppgtt)
 			goto err_put;
 
-		__set_ppgtt(ctx, ppgtt);
+		__set_ppgtt(ctx, &ppgtt->vm);
+		i915_vm_put(&ppgtt->vm);
 	}
 
 	return ctx;

drivers/gpu/drm/i915/gt/intel_lrc.c

@@ -1505,7 +1505,7 @@ __execlists_context_pin(struct intel_context *ce,
 	void *vaddr;
 	int ret;
 
-	GEM_BUG_ON(!ce->gem_context->ppgtt);
+	GEM_BUG_ON(!ce->gem_context->vm);
 
 	ret = execlists_context_deferred_alloc(ce, engine);
 	if (ret)
@@ -1621,7 +1621,8 @@ static int gen8_emit_init_breadcrumb(struct i915_request *rq)
 static int emit_pdps(struct i915_request *rq)
 {
 	const struct intel_engine_cs * const engine = rq->engine;
-	struct i915_hw_ppgtt * const ppgtt = rq->gem_context->ppgtt;
+	struct i915_hw_ppgtt * const ppgtt =
+		i915_vm_to_ppgtt(rq->gem_context->vm);
 	int err, i;
 	u32 *cs;
 
@@ -1694,7 +1695,7 @@ static int execlists_request_alloc(struct i915_request *request)
 	 */
 
 	/* Unconditionally invalidate GPU caches and TLBs. */
-	if (i915_vm_is_4lvl(&request->gem_context->ppgtt->vm))
+	if (i915_vm_is_4lvl(request->gem_context->vm))
 		ret = request->engine->emit_flush(request, EMIT_INVALIDATE);
 	else
 		ret = emit_pdps(request);
@@ -2824,7 +2825,7 @@ static void execlists_init_reg_state(u32 *regs,
 				     struct intel_engine_cs *engine,
 				     struct intel_ring *ring)
 {
-	struct i915_hw_ppgtt *ppgtt = ce->gem_context->ppgtt;
+	struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(ce->gem_context->vm);
 	bool rcs = engine->class == RENDER_CLASS;
 	u32 base = engine->mmio_base;
 

drivers/gpu/drm/i915/gt/intel_ringbuffer.c

@@ -1330,23 +1330,23 @@ static void ring_context_destroy(struct kref *ref)
 
 static int __context_pin_ppgtt(struct i915_gem_context *ctx)
 {
-	struct i915_hw_ppgtt *ppgtt;
+	struct i915_address_space *vm;
 	int err = 0;
 
-	ppgtt = ctx->ppgtt ?: ctx->i915->mm.aliasing_ppgtt;
-	if (ppgtt)
-		err = gen6_ppgtt_pin(ppgtt);
+	vm = ctx->vm ?: &ctx->i915->mm.aliasing_ppgtt->vm;
+	if (vm)
+		err = gen6_ppgtt_pin(i915_vm_to_ppgtt((vm)));
 
 	return err;
 }
 
 static void __context_unpin_ppgtt(struct i915_gem_context *ctx)
 {
-	struct i915_hw_ppgtt *ppgtt;
+	struct i915_address_space *vm;
 
-	ppgtt = ctx->ppgtt ?: ctx->i915->mm.aliasing_ppgtt;
-	if (ppgtt)
-		gen6_ppgtt_unpin(ppgtt);
+	vm = ctx->vm ?: &ctx->i915->mm.aliasing_ppgtt->vm;
+	if (vm)
+		gen6_ppgtt_unpin(i915_vm_to_ppgtt(vm));
 }
 
 static int __context_pin(struct intel_context *ce)
@@ -1704,14 +1704,16 @@ static int switch_context(struct i915_request *rq)
 {
 	struct intel_engine_cs *engine = rq->engine;
 	struct i915_gem_context *ctx = rq->gem_context;
-	struct i915_hw_ppgtt *ppgtt = ctx->ppgtt ?: rq->i915->mm.aliasing_ppgtt;
+	struct i915_address_space *vm =
+		ctx->vm ?: &rq->i915->mm.aliasing_ppgtt->vm;
 	unsigned int unwind_mm = 0;
 	u32 hw_flags = 0;
 	int ret, i;
 
 	GEM_BUG_ON(HAS_EXECLISTS(rq->i915));
 
-	if (ppgtt) {
+	if (vm) {
+		struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(vm);
 		int loops;
 
 		/*
@@ -1758,7 +1760,7 @@ static int switch_context(struct i915_request *rq)
 			goto err_mm;
 	}
 
-	if (ppgtt) {
+	if (vm) {
 		ret = engine->emit_flush(rq, EMIT_INVALIDATE);
 		if (ret)
 			goto err_mm;
@@ -1801,7 +1803,7 @@ static int switch_context(struct i915_request *rq)
 
 err_mm:
 	if (unwind_mm)
-		ppgtt->pd_dirty_engines |= unwind_mm;
+		i915_vm_to_ppgtt(vm)->pd_dirty_engines |= unwind_mm;
 err:
 	return ret;
 }

drivers/gpu/drm/i915/gt/selftest_hangcheck.c

@@ -128,8 +128,7 @@ static struct i915_request *
 hang_create_request(struct hang *h, struct intel_engine_cs *engine)
 {
 	struct drm_i915_private *i915 = h->i915;
-	struct i915_address_space *vm =
-		h->ctx->ppgtt ? &h->ctx->ppgtt->vm : &i915->ggtt.vm;
+	struct i915_address_space *vm = h->ctx->vm ?: &i915->ggtt.vm;
 	struct i915_request *rq = NULL;
 	struct i915_vma *hws, *vma;
 	unsigned int flags;
@@ -1354,8 +1353,8 @@ static int igt_reset_evict_ppgtt(void *arg)
 	}
 
 	err = 0;
-	if (ctx->ppgtt) /* aliasing == global gtt locking, covered above */
-		err = __igt_reset_evict_vma(i915, &ctx->ppgtt->vm,
+	if (ctx->vm) /* aliasing == global gtt locking, covered above */
+		err = __igt_reset_evict_vma(i915, ctx->vm,
 					    evict_vma, EXEC_OBJECT_WRITE);
 
 out:

drivers/gpu/drm/i915/gt/selftest_lrc.c

@@ -1090,7 +1090,7 @@ static int smoke_submit(struct preempt_smoke *smoke,
 	int err = 0;
 
 	if (batch) {
-		vma = i915_vma_instance(batch, &ctx->ppgtt->vm, NULL);
+		vma = i915_vma_instance(batch, ctx->vm, NULL);
 		if (IS_ERR(vma))
 			return PTR_ERR(vma);
 

drivers/gpu/drm/i915/gt/selftest_workarounds.c

@@ -358,7 +358,7 @@ static struct i915_vma *create_batch(struct i915_gem_context *ctx)
 	if (IS_ERR(obj))
 		return ERR_CAST(obj);
 
-	vma = i915_vma_instance(obj, &ctx->ppgtt->vm, NULL);
+	vma = i915_vma_instance(obj, ctx->vm, NULL);
 	if (IS_ERR(vma)) {
 		err = PTR_ERR(vma);
 		goto err_obj;
@@ -442,7 +442,7 @@ static int check_dirty_whitelist(struct i915_gem_context *ctx,
 	int err = 0, i, v;
 	u32 *cs, *results;
 
-	scratch = create_scratch(&ctx->ppgtt->vm, 2 * ARRAY_SIZE(values) + 1);
+	scratch = create_scratch(ctx->vm, 2 * ARRAY_SIZE(values) + 1);
 	if (IS_ERR(scratch))
 		return PTR_ERR(scratch);
 
@@ -925,7 +925,7 @@ static int live_isolated_whitelist(void *arg)
 	if (!intel_engines_has_context_isolation(i915))
 		return 0;
 
-	if (!i915->kernel_context->ppgtt)
+	if (!i915->kernel_context->vm)
 		return 0;
 
 	for (i = 0; i < ARRAY_SIZE(client); i++) {
@@ -937,14 +937,14 @@ static int live_isolated_whitelist(void *arg)
 			goto err;
 		}
 
-		client[i].scratch[0] = create_scratch(&c->ppgtt->vm, 1024);
+		client[i].scratch[0] = create_scratch(c->vm, 1024);
 		if (IS_ERR(client[i].scratch[0])) {
 			err = PTR_ERR(client[i].scratch[0]);
 			kernel_context_close(c);
 			goto err;
 		}
 
-		client[i].scratch[1] = create_scratch(&c->ppgtt->vm, 1024);
+		client[i].scratch[1] = create_scratch(c->vm, 1024);
 		if (IS_ERR(client[i].scratch[1])) {
 			err = PTR_ERR(client[i].scratch[1]);
 			i915_vma_unpin_and_release(&client[i].scratch[0], 0);

drivers/gpu/drm/i915/gvt/scheduler.c

@@ -368,7 +368,7 @@ static int set_context_ppgtt_from_shadow(struct intel_vgpu_workload *workload,
 					 struct i915_gem_context *ctx)
 {
 	struct intel_vgpu_mm *mm = workload->shadow_mm;
-	struct i915_hw_ppgtt *ppgtt = ctx->ppgtt;
+	struct i915_hw_ppgtt *ppgtt = i915_vm_to_ppgtt(ctx->vm);
 	int i = 0;
 
 	if (mm->type != INTEL_GVT_MM_PPGTT || !mm->ppgtt_mm.shadowed)
@@ -1130,7 +1130,7 @@ void intel_vgpu_clean_submission(struct intel_vgpu *vgpu)
 
 	intel_vgpu_select_submission_ops(vgpu, ALL_ENGINES, 0);
 
-	i915_context_ppgtt_root_restore(s, s->shadow[0]->gem_context->ppgtt);
+	i915_context_ppgtt_root_restore(s, i915_vm_to_ppgtt(s->shadow[0]->gem_context->vm));
 	for_each_engine(engine, vgpu->gvt->dev_priv, id)
 		intel_context_unpin(s->shadow[id]);
 
@@ -1195,7 +1195,7 @@ int intel_vgpu_setup_submission(struct intel_vgpu *vgpu)
 	if (IS_ERR(ctx))
 		return PTR_ERR(ctx);
 
-	i915_context_ppgtt_root_save(s, ctx->ppgtt);
+	i915_context_ppgtt_root_save(s, i915_vm_to_ppgtt(ctx->vm));
 
 	for_each_engine(engine, vgpu->gvt->dev_priv, i) {
 		struct intel_context *ce;
@@ -1238,7 +1238,7 @@ int intel_vgpu_setup_submission(struct intel_vgpu *vgpu)
 	return 0;
 
 out_shadow_ctx:
-	i915_context_ppgtt_root_restore(s, ctx->ppgtt);
+	i915_context_ppgtt_root_restore(s, i915_vm_to_ppgtt(ctx->vm));
 	for_each_engine(engine, vgpu->gvt->dev_priv, i) {
 		if (IS_ERR(s->shadow[i]))
 			break;

drivers/gpu/drm/i915/i915_debugfs.c

@@ -427,7 +427,7 @@ static void print_context_stats(struct seq_file *m,
 		i915_gem_context_unlock_engines(ctx);
 
 		if (!IS_ERR_OR_NULL(ctx->file_priv)) {
-			struct file_stats stats = { .vm = &ctx->ppgtt->vm, };
+			struct file_stats stats = { .vm = ctx->vm, };
 			struct drm_file *file = ctx->file_priv->file;
 			struct task_struct *task;
 			char name[80];

drivers/gpu/drm/i915/i915_drv.h

@@ -2658,12 +2658,6 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
 struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
 				struct drm_gem_object *gem_obj, int flags);
 
-static inline struct i915_hw_ppgtt *
-i915_vm_to_ppgtt(struct i915_address_space *vm)
-{
-	return container_of(vm, struct i915_hw_ppgtt, vm);
-}
-
 /* i915_gem_fence_reg.c */
 struct drm_i915_fence_reg *
 i915_reserve_fence(struct drm_i915_private *dev_priv);

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -483,6 +483,8 @@ static void vm_free_page(struct i915_address_space *vm, struct page *page)
 
 static void i915_address_space_init(struct i915_address_space *vm, int subclass)
 {
+	kref_init(&vm->ref);
+
 	/*
 	 * The vm->mutex must be reclaim safe (for use in the shrinker).
 	 * Do a dummy acquire now under fs_reclaim so that any allocation
@@ -1230,9 +1232,8 @@ static int gen8_init_scratch(struct i915_address_space *vm)
 	 */
 	if (vm->has_read_only &&
 	    vm->i915->kernel_context &&
-	    vm->i915->kernel_context->ppgtt) {
-		struct i915_address_space *clone =
-			&vm->i915->kernel_context->ppgtt->vm;
+	    vm->i915->kernel_context->vm) {
+		struct i915_address_space *clone = vm->i915->kernel_context->vm;
 
 		GEM_BUG_ON(!clone->has_read_only);
 
@@ -1591,8 +1592,6 @@ static int gen8_preallocate_top_level_pdp(struct i915_hw_ppgtt *ppgtt)
 static void ppgtt_init(struct drm_i915_private *i915,
 		       struct i915_hw_ppgtt *ppgtt)
 {
-	kref_init(&ppgtt->ref);
-
 	ppgtt->vm.i915 = i915;
 	ppgtt->vm.dma = &i915->drm.pdev->dev;
 	ppgtt->vm.total = BIT_ULL(INTEL_INFO(i915)->ppgtt_size);
@@ -2272,21 +2271,23 @@ static void ppgtt_destroy_vma(struct i915_address_space *vm)
 	}
 }
 
-void i915_ppgtt_release(struct kref *kref)
+void i915_vm_release(struct kref *kref)
 {
-	struct i915_hw_ppgtt *ppgtt =
-		container_of(kref, struct i915_hw_ppgtt, ref);
+	struct i915_address_space *vm =
+		container_of(kref, struct i915_address_space, ref);
 
-	trace_i915_ppgtt_release(&ppgtt->vm);
+	GEM_BUG_ON(i915_is_ggtt(vm));
+	trace_i915_ppgtt_release(vm);
 
-	ppgtt_destroy_vma(&ppgtt->vm);
+	ppgtt_destroy_vma(vm);
 
-	GEM_BUG_ON(!list_empty(&ppgtt->vm.bound_list));
-	GEM_BUG_ON(!list_empty(&ppgtt->vm.unbound_list));
+	GEM_BUG_ON(!list_empty(&vm->bound_list));
+	GEM_BUG_ON(!list_empty(&vm->unbound_list));
 
-	ppgtt->vm.cleanup(&ppgtt->vm);
-	i915_address_space_fini(&ppgtt->vm);
-	kfree(ppgtt);
+	vm->cleanup(vm);
+	i915_address_space_fini(vm);
+
+	kfree(vm);
 }
 
 /* Certain Gen5 chipsets require require idling the GPU before
@@ -2788,7 +2789,7 @@ static int init_aliasing_ppgtt(struct drm_i915_private *i915)
 	return 0;
 
 err_ppgtt:
-	i915_ppgtt_put(ppgtt);
+	i915_vm_put(&ppgtt->vm);
 	return err;
 }
 
@@ -2801,7 +2802,7 @@ static void fini_aliasing_ppgtt(struct drm_i915_private *i915)
 	if (!ppgtt)
 		return;
 
-	i915_ppgtt_put(ppgtt);
+	i915_vm_put(&ppgtt->vm);
 
 	ggtt->vm.vma_ops.bind_vma   = ggtt_bind_vma;
 	ggtt->vm.vma_ops.unbind_vma = ggtt_unbind_vma;

drivers/gpu/drm/i915/i915_gem_gtt.h

@@ -293,6 +293,8 @@ struct pagestash {
 };
 
 struct i915_address_space {
+	struct kref ref;
+
 	struct drm_mm mm;
 	struct drm_i915_private *i915;
 	struct device *dma;
@@ -412,7 +414,6 @@ struct i915_ggtt {
 
 struct i915_hw_ppgtt {
 	struct i915_address_space vm;
-	struct kref ref;
 
 	intel_engine_mask_t pd_dirty_engines;
 	union {
@@ -582,10 +583,19 @@ i915_page_dir_dma_addr(const struct i915_hw_ppgtt *ppgtt, const unsigned n)
 static inline struct i915_ggtt *
 i915_vm_to_ggtt(struct i915_address_space *vm)
 {
+	BUILD_BUG_ON(offsetof(struct i915_ggtt, vm));
 	GEM_BUG_ON(!i915_is_ggtt(vm));
 	return container_of(vm, struct i915_ggtt, vm);
 }
 
+static inline struct i915_hw_ppgtt *
+i915_vm_to_ppgtt(struct i915_address_space *vm)
+{
+	BUILD_BUG_ON(offsetof(struct i915_hw_ppgtt, vm));
+	GEM_BUG_ON(i915_is_ggtt(vm));
+	return container_of(vm, struct i915_hw_ppgtt, vm);
+}
+
 #define INTEL_MAX_PPAT_ENTRIES 8
 #define INTEL_PPAT_PERFECT_MATCH (~0U)
 
@@ -628,18 +638,19 @@ void i915_ggtt_cleanup_hw(struct drm_i915_private *dev_priv);
 int i915_ppgtt_init_hw(struct drm_i915_private *dev_priv);
 
 struct i915_hw_ppgtt *i915_ppgtt_create(struct drm_i915_private *dev_priv);
-void i915_ppgtt_release(struct kref *kref);
 
-static inline struct i915_hw_ppgtt *i915_ppgtt_get(struct i915_hw_ppgtt *ppgtt)
+static inline struct i915_address_space *
+i915_vm_get(struct i915_address_space *vm)
 {
-	kref_get(&ppgtt->ref);
-	return ppgtt;
+	kref_get(&vm->ref);
+	return vm;
 }
 
-static inline void i915_ppgtt_put(struct i915_hw_ppgtt *ppgtt)
+void i915_vm_release(struct kref *kref);
+
+static inline void i915_vm_put(struct i915_address_space *vm)
 {
-	if (ppgtt)
-		kref_put(&ppgtt->ref, i915_ppgtt_release);
+	kref_put(&vm->ref, i915_vm_release);
 }
 
 int gen6_ppgtt_pin(struct i915_hw_ppgtt *base);

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -1431,7 +1431,7 @@ static void gem_record_rings(struct i915_gpu_state *error)
 			struct i915_gem_context *ctx = request->gem_context;
 			struct intel_ring *ring;
 
-			ee->vm = ctx->ppgtt ? &ctx->ppgtt->vm : &ggtt->vm;
+			ee->vm = ctx->vm ?: &ggtt->vm;
 
 			record_context(&ee->context, ctx);
 

drivers/gpu/drm/i915/i915_trace.h

@@ -977,7 +977,7 @@ DECLARE_EVENT_CLASS(i915_context,
 			__entry->dev = ctx->i915->drm.primary->index;
 			__entry->ctx = ctx;
 			__entry->hw_id = ctx->hw_id;
-			__entry->vm = ctx->ppgtt ? &ctx->ppgtt->vm : NULL;
+			__entry->vm = ctx->vm;
 	),
 
 	TP_printk("dev=%u, ctx=%p, ctx_vm=%p, hw_id=%u",

drivers/gpu/drm/i915/selftests/i915_gem_gtt.c

@@ -209,7 +209,7 @@ static int igt_ppgtt_alloc(void *arg)
 
 err_ppgtt_cleanup:
 	mutex_lock(&dev_priv->drm.struct_mutex);
-	i915_ppgtt_put(ppgtt);
+	i915_vm_put(&ppgtt->vm);
 	mutex_unlock(&dev_priv->drm.struct_mutex);
 	return err;
 }
@@ -1021,7 +1021,7 @@ static int exercise_ppgtt(struct drm_i915_private *dev_priv,
 
 	err = func(dev_priv, &ppgtt->vm, 0, ppgtt->vm.total, end_time);
 
-	i915_ppgtt_put(ppgtt);
+	i915_vm_put(&ppgtt->vm);
 out_unlock:
 	mutex_unlock(&dev_priv->drm.struct_mutex);
 
@@ -1251,7 +1251,6 @@ static int exercise_mock(struct drm_i915_private *i915,
 {
 	const u64 limit = totalram_pages() << PAGE_SHIFT;
 	struct i915_gem_context *ctx;
-	struct i915_hw_ppgtt *ppgtt;
 	IGT_TIMEOUT(end_time);
 	int err;
 
@@ -1259,10 +1258,7 @@ static int exercise_mock(struct drm_i915_private *i915,
 	if (!ctx)
 		return -ENOMEM;
 
-	ppgtt = ctx->ppgtt;
-	GEM_BUG_ON(!ppgtt);
-
-	err = func(i915, &ppgtt->vm, 0, min(ppgtt->vm.total, limit), end_time);
+	err = func(i915, ctx->vm, 0, min(ctx->vm->total, limit), end_time);
 
 	mock_context_close(ctx);
 	return err;

drivers/gpu/drm/i915/selftests/i915_request.c

@@ -754,8 +754,7 @@ static int live_empty_request(void *arg)
 static struct i915_vma *recursive_batch(struct drm_i915_private *i915)
 {
 	struct i915_gem_context *ctx = i915->kernel_context;
-	struct i915_address_space *vm =
-		ctx->ppgtt ? &ctx->ppgtt->vm : &i915->ggtt.vm;
+	struct i915_address_space *vm = ctx->vm ?: &i915->ggtt.vm;
 	struct drm_i915_gem_object *obj;
 	const int gen = INTEL_GEN(i915);
 	struct i915_vma *vma;

drivers/gpu/drm/i915/selftests/i915_vma.c

@@ -38,7 +38,7 @@ static bool assert_vma(struct i915_vma *vma,
 {
 	bool ok = true;
 
-	if (vma->vm != &ctx->ppgtt->vm) {
+	if (vma->vm != ctx->vm) {
 		pr_err("VMA created with wrong VM\n");
 		ok = false;
 	}
@@ -113,7 +113,7 @@ static int create_vmas(struct drm_i915_private *i915,
 	list_for_each_entry(obj, objects, st_link) {
 		for (pinned = 0; pinned <= 1; pinned++) {
 			list_for_each_entry(ctx, contexts, link) {
-				struct i915_address_space *vm = &ctx->ppgtt->vm;
+				struct i915_address_space *vm = ctx->vm;
 				struct i915_vma *vma;
 				int err;
 

drivers/gpu/drm/i915/selftests/igt_spinner.c

@@ -89,17 +89,16 @@ igt_spinner_create_request(struct igt_spinner *spin,
 			   struct intel_engine_cs *engine,
 			   u32 arbitration_command)
 {
-	struct i915_address_space *vm = &ctx->ppgtt->vm;
 	struct i915_request *rq = NULL;
 	struct i915_vma *hws, *vma;
 	u32 *batch;
 	int err;
 
-	vma = i915_vma_instance(spin->obj, vm, NULL);
+	vma = i915_vma_instance(spin->obj, ctx->vm, NULL);
 	if (IS_ERR(vma))
 		return ERR_CAST(vma);
 
-	hws = i915_vma_instance(spin->hws, vm, NULL);
+	hws = i915_vma_instance(spin->hws, ctx->vm, NULL);
 	if (IS_ERR(hws))
 		return ERR_CAST(hws);
 

drivers/gpu/drm/i915/selftests/mock_gtt.c

@@ -65,7 +65,6 @@ mock_ppgtt(struct drm_i915_private *i915,
 	if (!ppgtt)
 		return NULL;
 
-	kref_init(&ppgtt->ref);
 	ppgtt->vm.i915 = i915;
 	ppgtt->vm.total = round_down(U64_MAX, PAGE_SIZE);
 	ppgtt->vm.file = ERR_PTR(-ENODEV);