drm/i915: Decouple vma vfuncs from vm

To allow for future non-object backed vma, we need to be able to
specialise the callbacks for binding, et al, the vma. For example,
instead of calling vma->vm->bind_vma(), we now call
vma->ops->bind_vma(). This gives us the opportunity to later override the
operation for a custom vma.

v2: flip order of unbind/bind

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180607154047.9171-2-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -1616,12 +1616,13 @@ static int gen8_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
 		gen8_ppgtt_notify_vgt(ppgtt, true);
 
 	ppgtt->vm.cleanup = gen8_ppgtt_cleanup;
-	ppgtt->vm.bind_vma = gen8_ppgtt_bind_vma;
-	ppgtt->vm.unbind_vma = ppgtt_unbind_vma;
-	ppgtt->vm.set_pages = ppgtt_set_pages;
-	ppgtt->vm.clear_pages = clear_pages;
 	ppgtt->debug_dump = gen8_dump_ppgtt;
 
+	ppgtt->vm.vma_ops.bind_vma    = gen8_ppgtt_bind_vma;
+	ppgtt->vm.vma_ops.unbind_vma  = ppgtt_unbind_vma;
+	ppgtt->vm.vma_ops.set_pages   = ppgtt_set_pages;
+	ppgtt->vm.vma_ops.clear_pages = clear_pages;
+
 	return 0;
 
 free_scratch:
@@ -2059,13 +2060,14 @@ static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
 
 	ppgtt->vm.clear_range = gen6_ppgtt_clear_range;
 	ppgtt->vm.insert_entries = gen6_ppgtt_insert_entries;
-	ppgtt->vm.bind_vma = gen6_ppgtt_bind_vma;
-	ppgtt->vm.unbind_vma = ppgtt_unbind_vma;
-	ppgtt->vm.set_pages = ppgtt_set_pages;
-	ppgtt->vm.clear_pages = clear_pages;
 	ppgtt->vm.cleanup = gen6_ppgtt_cleanup;
 	ppgtt->debug_dump = gen6_dump_ppgtt;
 
+	ppgtt->vm.vma_ops.bind_vma    = gen6_ppgtt_bind_vma;
+	ppgtt->vm.vma_ops.unbind_vma  = ppgtt_unbind_vma;
+	ppgtt->vm.vma_ops.set_pages   = ppgtt_set_pages;
+	ppgtt->vm.vma_ops.clear_pages = clear_pages;
+
 	DRM_DEBUG_DRIVER("Allocated pde space (%lldM) at GTT entry: %llx\n",
 			 ppgtt->node.size >> 20,
 			 ppgtt->node.start / PAGE_SIZE);
@@ -2793,11 +2795,11 @@ int i915_gem_init_aliasing_ppgtt(struct drm_i915_private *i915)
 
 	i915->mm.aliasing_ppgtt = ppgtt;
 
-	GEM_BUG_ON(ggtt->vm.bind_vma != ggtt_bind_vma);
-	ggtt->vm.bind_vma = aliasing_gtt_bind_vma;
+	GEM_BUG_ON(ggtt->vm.vma_ops.bind_vma != ggtt_bind_vma);
+	ggtt->vm.vma_ops.bind_vma = aliasing_gtt_bind_vma;
 
-	GEM_BUG_ON(ggtt->vm.unbind_vma != ggtt_unbind_vma);
-	ggtt->vm.unbind_vma = aliasing_gtt_unbind_vma;
+	GEM_BUG_ON(ggtt->vm.vma_ops.unbind_vma != ggtt_unbind_vma);
+	ggtt->vm.vma_ops.unbind_vma = aliasing_gtt_unbind_vma;
 
 	return 0;
 
@@ -2817,8 +2819,8 @@ void i915_gem_fini_aliasing_ppgtt(struct drm_i915_private *i915)
 
 	i915_ppgtt_put(ppgtt);
 
-	ggtt->vm.bind_vma = ggtt_bind_vma;
-	ggtt->vm.unbind_vma = ggtt_unbind_vma;
+	ggtt->vm.vma_ops.bind_vma   = ggtt_bind_vma;
+	ggtt->vm.vma_ops.unbind_vma = ggtt_unbind_vma;
 }
 
 int i915_gem_init_ggtt(struct drm_i915_private *dev_priv)
@@ -3310,10 +3312,6 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt)
 
 	ggtt->vm.total = (size / sizeof(gen8_pte_t)) << PAGE_SHIFT;
 	ggtt->vm.cleanup = gen6_gmch_remove;
-	ggtt->vm.bind_vma = ggtt_bind_vma;
-	ggtt->vm.unbind_vma = ggtt_unbind_vma;
-	ggtt->vm.set_pages = ggtt_set_pages;
-	ggtt->vm.clear_pages = clear_pages;
 	ggtt->vm.insert_page = gen8_ggtt_insert_page;
 	ggtt->vm.clear_range = nop_clear_range;
 	if (!USES_FULL_PPGTT(dev_priv) || intel_scanout_needs_vtd_wa(dev_priv))
@@ -3331,6 +3329,11 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt)
 
 	ggtt->invalidate = gen6_ggtt_invalidate;
 
+	ggtt->vm.vma_ops.bind_vma    = ggtt_bind_vma;
+	ggtt->vm.vma_ops.unbind_vma  = ggtt_unbind_vma;
+	ggtt->vm.vma_ops.set_pages   = ggtt_set_pages;
+	ggtt->vm.vma_ops.clear_pages = clear_pages;
+
 	setup_private_pat(dev_priv);
 
 	return ggtt_probe_common(ggtt, size);
@@ -3370,10 +3373,6 @@ static int gen6_gmch_probe(struct i915_ggtt *ggtt)
 	ggtt->vm.clear_range = gen6_ggtt_clear_range;
 	ggtt->vm.insert_page = gen6_ggtt_insert_page;
 	ggtt->vm.insert_entries = gen6_ggtt_insert_entries;
-	ggtt->vm.bind_vma = ggtt_bind_vma;
-	ggtt->vm.unbind_vma = ggtt_unbind_vma;
-	ggtt->vm.set_pages = ggtt_set_pages;
-	ggtt->vm.clear_pages = clear_pages;
 	ggtt->vm.cleanup = gen6_gmch_remove;
 
 	ggtt->invalidate = gen6_ggtt_invalidate;
@@ -3389,6 +3388,11 @@ static int gen6_gmch_probe(struct i915_ggtt *ggtt)
 	else
 		ggtt->vm.pte_encode = snb_pte_encode;
 
+	ggtt->vm.vma_ops.bind_vma    = ggtt_bind_vma;
+	ggtt->vm.vma_ops.unbind_vma  = ggtt_unbind_vma;
+	ggtt->vm.vma_ops.set_pages   = ggtt_set_pages;
+	ggtt->vm.vma_ops.clear_pages = clear_pages;
+
 	return ggtt_probe_common(ggtt, size);
 }
 
@@ -3419,14 +3423,15 @@ static int i915_gmch_probe(struct i915_ggtt *ggtt)
 	ggtt->vm.insert_page = i915_ggtt_insert_page;
 	ggtt->vm.insert_entries = i915_ggtt_insert_entries;
 	ggtt->vm.clear_range = i915_ggtt_clear_range;
-	ggtt->vm.bind_vma = ggtt_bind_vma;
-	ggtt->vm.unbind_vma = ggtt_unbind_vma;
-	ggtt->vm.set_pages = ggtt_set_pages;
-	ggtt->vm.clear_pages = clear_pages;
 	ggtt->vm.cleanup = i915_gmch_remove;
 
 	ggtt->invalidate = gmch_ggtt_invalidate;
 
+	ggtt->vm.vma_ops.bind_vma    = ggtt_bind_vma;
+	ggtt->vm.vma_ops.unbind_vma  = ggtt_unbind_vma;
+	ggtt->vm.vma_ops.set_pages   = ggtt_set_pages;
+	ggtt->vm.vma_ops.clear_pages = clear_pages;
+
 	if (unlikely(ggtt->do_idle_maps))
 		DRM_INFO("applying Ironlake quirks for intel_iommu\n");
 

drivers/gpu/drm/i915/i915_gem_gtt.h

@@ -58,6 +58,7 @@
 
 struct drm_i915_file_private;
 struct drm_i915_fence_reg;
+struct i915_vma;
 
 typedef u32 gen6_pte_t;
 typedef u64 gen8_pte_t;
@@ -254,6 +255,21 @@ struct i915_pml4 {
 	struct i915_page_directory_pointer *pdps[GEN8_PML4ES_PER_PML4];
 };
 
+struct i915_vma_ops {
+	/* Map an object into an address space with the given cache flags. */
+	int (*bind_vma)(struct i915_vma *vma,
+			enum i915_cache_level cache_level,
+			u32 flags);
+	/*
+	 * Unmap an object from an address space. This usually consists of
+	 * setting the valid PTE entries to a reserved scratch page.
+	 */
+	void (*unbind_vma)(struct i915_vma *vma);
+
+	int (*set_pages)(struct i915_vma *vma);
+	void (*clear_pages)(struct i915_vma *vma);
+};
+
 struct i915_address_space {
 	struct drm_mm mm;
 	struct drm_i915_private *i915;
@@ -331,15 +347,8 @@ struct i915_address_space {
 			       enum i915_cache_level cache_level,
 			       u32 flags);
 	void (*cleanup)(struct i915_address_space *vm);
-	/** Unmap an object from an address space. This usually consists of
-	 * setting the valid PTE entries to a reserved scratch page. */
-	void (*unbind_vma)(struct i915_vma *vma);
-	/* Map an object into an address space with the given cache flags. */
-	int (*bind_vma)(struct i915_vma *vma,
-			enum i915_cache_level cache_level,
-			u32 flags);
-	int (*set_pages)(struct i915_vma *vma);
-	void (*clear_pages)(struct i915_vma *vma);
+
+	struct i915_vma_ops vma_ops;
 
 	I915_SELFTEST_DECLARE(struct fault_attr fault_attr);
 	I915_SELFTEST_DECLARE(bool scrub_64K);

drivers/gpu/drm/i915/i915_vma.c

@@ -95,6 +95,7 @@ vma_create(struct drm_i915_gem_object *obj,
 		init_request_active(&vma->last_read[i], i915_vma_retire);
 	init_request_active(&vma->last_fence, NULL);
 	vma->vm = vm;
+	vma->ops = &vm->vma_ops;
 	vma->obj = obj;
 	vma->resv = obj->resv;
 	vma->size = obj->base.size;
@@ -280,7 +281,7 @@ int i915_vma_bind(struct i915_vma *vma, enum i915_cache_level cache_level,
 	GEM_BUG_ON(!vma->pages);
 
 	trace_i915_vma_bind(vma, bind_flags);
-	ret = vma->vm->bind_vma(vma, cache_level, bind_flags);
+	ret = vma->ops->bind_vma(vma, cache_level, bind_flags);
 	if (ret)
 		return ret;
 
@@ -543,7 +544,7 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 
 	GEM_BUG_ON(vma->pages);
 
-	ret = vma->vm->set_pages(vma);
+	ret = vma->ops->set_pages(vma);
 	if (ret)
 		goto err_unpin;
 
@@ -622,7 +623,7 @@ i915_vma_insert(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 	return 0;
 
 err_clear:
-	vma->vm->clear_pages(vma);
+	vma->ops->clear_pages(vma);
 err_unpin:
 	if (vma->obj)
 		i915_gem_object_unpin_pages(vma->obj);
@@ -637,7 +638,7 @@ i915_vma_remove(struct i915_vma *vma)
 	GEM_BUG_ON(!drm_mm_node_allocated(&vma->node));
 	GEM_BUG_ON(vma->flags & (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND));
 
-	vma->vm->clear_pages(vma);
+	vma->ops->clear_pages(vma);
 
 	drm_mm_remove_node(&vma->node);
 	list_move_tail(&vma->vm_link, &vma->vm->unbound_list);
@@ -906,7 +907,7 @@ int i915_vma_unbind(struct i915_vma *vma)
 
 	if (likely(!vma->vm->closed)) {
 		trace_i915_vma_unbind(vma);
-		vma->vm->unbind_vma(vma);
+		vma->ops->unbind_vma(vma);
 	}
 	vma->flags &= ~(I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND);
 

drivers/gpu/drm/i915/i915_vma.h

@@ -49,6 +49,7 @@ struct i915_vma {
 	struct drm_mm_node node;
 	struct drm_i915_gem_object *obj;
 	struct i915_address_space *vm;
+	const struct i915_vma_ops *ops;
 	struct drm_i915_fence_reg *fence;
 	struct reservation_object *resv; /** Alias of obj->resv */
 	struct sg_table *pages;

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

@@ -80,12 +80,13 @@ mock_ppgtt(struct drm_i915_private *i915,
 	ppgtt->vm.clear_range = nop_clear_range;
 	ppgtt->vm.insert_page = mock_insert_page;
 	ppgtt->vm.insert_entries = mock_insert_entries;
-	ppgtt->vm.bind_vma = mock_bind_ppgtt;
-	ppgtt->vm.unbind_vma = mock_unbind_ppgtt;
-	ppgtt->vm.set_pages = ppgtt_set_pages;
-	ppgtt->vm.clear_pages = clear_pages;
 	ppgtt->vm.cleanup = mock_cleanup;
 
+	ppgtt->vm.vma_ops.bind_vma    = mock_bind_ppgtt;
+	ppgtt->vm.vma_ops.unbind_vma  = mock_unbind_ppgtt;
+	ppgtt->vm.vma_ops.set_pages   = ppgtt_set_pages;
+	ppgtt->vm.vma_ops.clear_pages = clear_pages;
+
 	return ppgtt;
 }
 
@@ -116,12 +117,13 @@ void mock_init_ggtt(struct drm_i915_private *i915)
 	ggtt->vm.clear_range = nop_clear_range;
 	ggtt->vm.insert_page = mock_insert_page;
 	ggtt->vm.insert_entries = mock_insert_entries;
-	ggtt->vm.bind_vma = mock_bind_ggtt;
-	ggtt->vm.unbind_vma = mock_unbind_ggtt;
-	ggtt->vm.set_pages = ggtt_set_pages;
-	ggtt->vm.clear_pages = clear_pages;
 	ggtt->vm.cleanup = mock_cleanup;
 
+	ggtt->vm.vma_ops.bind_vma    = mock_bind_ggtt;
+	ggtt->vm.vma_ops.unbind_vma  = mock_unbind_ggtt;
+	ggtt->vm.vma_ops.set_pages   = ggtt_set_pages;
+	ggtt->vm.vma_ops.clear_pages = clear_pages;
+
 	i915_address_space_init(&ggtt->vm, i915, "global");
 }