[PATCH 27/37] drm/i915: Exercising filling the top/bottom portions of the ppgtt

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Allocate objects with varying number of pages (which should hopefully
consist of a mixture of contiguous page chunks and so coalesced sg
lists) and check that the sg walkers in insert_pages cope.

Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_drv.h               |   2 +-
 drivers/gpu/drm/i915/i915_gem_internal.c      |   4 +-
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 159 ++++++++++++++++++++++++++
 3 files changed, 163 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b84c1d1fa12c..65298edc0e9c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3506,7 +3506,7 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv
 /* i915_gem_internal.c */
 struct drm_i915_gem_object *
 i915_gem_object_create_internal(struct drm_i915_private *dev_priv,
-				unsigned int size);
+				unsigned long size);
 
 /* i915_gem_shrinker.c */
 unsigned long i915_gem_shrink(struct drm_i915_private *dev_priv,
diff --git a/drivers/gpu/drm/i915/i915_gem_internal.c b/drivers/gpu/drm/i915/i915_gem_internal.c
index 2222863e505f..92f66e959a9f 100644
--- a/drivers/gpu/drm/i915/i915_gem_internal.c
+++ b/drivers/gpu/drm/i915/i915_gem_internal.c
@@ -151,10 +151,12 @@ static const struct drm_i915_gem_object_ops i915_gem_object_internal_ops = {
  */
 struct drm_i915_gem_object *
 i915_gem_object_create_internal(struct drm_i915_private *i915,
-				unsigned int size)
+				unsigned long size)
 {
 	struct drm_i915_gem_object *obj;
 
+	GEM_BUG_ON(!size);
+
 	obj = i915_gem_object_alloc(i915);
 	if (!obj)
 		return ERR_PTR(-ENOMEM);
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 97b55e9726d8..5d0e6f60bea7 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -22,7 +22,10 @@
  *
  */
 
+#include <linux/prime_numbers.h>
+
 #include "i915_selftest.h"
+#include "huge_gem_object.h"
 
 static int igt_ppgtt_alloc(void *arg)
 {
@@ -85,10 +88,166 @@ static int igt_ppgtt_alloc(void *arg)
 	return err;
 }
 
+static struct i915_vma *vma_lookup(struct drm_i915_gem_object *obj,
+				   struct i915_address_space *vm)
+{
+	return i915_gem_obj_lookup_or_create_vma(obj, vm, NULL);
+}
+
+static int igt_ppgtt_fill(void *arg)
+{
+	struct drm_i915_private *dev_priv = arg;
+	unsigned long npages, max_pages = 1 << 20, prime;
+	struct drm_i915_gem_object *obj, *on;
+	struct i915_hw_ppgtt *ppgtt;
+	struct i915_vma *vma;
+	LIST_HEAD(objects);
+	int err = 0;
+
+	if (!USES_FULL_PPGTT(dev_priv))
+		return 0;
+
+	mutex_lock(&dev_priv->drm.struct_mutex);
+	ppgtt = i915_ppgtt_create(dev_priv, NULL, "mock");
+	if (IS_ERR(ppgtt)) {
+		err = PTR_ERR(ppgtt);
+		goto err_unlock;
+	}
+	GEM_BUG_ON(ppgtt->base.total & ~PAGE_MASK);
+
+	max_pages = min_t(u64, max_pages, ppgtt->base.total/2 >> PAGE_SHIFT);
+
+	for_each_prime_number_from(prime, 2, 13) {
+		for (npages = 1; npages <= max_pages; npages *= prime) {
+			u64 flags;
+
+			GEM_BUG_ON(!npages);
+			obj = huge_gem_object(dev_priv,
+					      PAGE_SIZE,
+					      npages << PAGE_SHIFT);
+			if (IS_ERR(obj))
+				break;
+
+			list_add(&obj->batch_pool_link, &objects);
+
+			/* Fill the GTT top down - hope we don't overstep the end */
+			flags = ppgtt->base.total | PIN_OFFSET_FIXED | PIN_USER;
+			list_for_each_entry(obj, &objects, batch_pool_link) {
+				vma = vma_lookup(obj, &ppgtt->base);
+				if (IS_ERR(vma))
+					continue;
+
+				flags -= obj->base.size;
+				err = i915_vma_pin(vma, 0, 0, flags);
+				if (err) {
+					pr_err("Fill top-down failed with err=%d on size=%lu pages (prime=%lu)\n", err, npages, prime);
+					goto err;
+				}
+
+				i915_vma_unpin(vma);
+			}
+
+			flags = ppgtt->base.total | PIN_OFFSET_FIXED | PIN_USER;
+			list_for_each_entry(obj, &objects, batch_pool_link) {
+				vma = vma_lookup(obj, &ppgtt->base);
+				if (IS_ERR(vma))
+					continue;
+
+				flags -= obj->base.size;
+				if (!drm_mm_node_allocated(&vma->node) ||
+				    i915_vma_misplaced(vma, 0, 0, flags)) {
+					pr_err("Fill top-down moved vma.node=%llx + %llx, expected offset %llx\n",
+					       vma->node.start, vma->node.size,
+					       flags & PAGE_MASK);
+					err = -EINVAL;
+					goto err;
+				}
+
+				err = i915_vma_unbind(vma);
+				if (err) {
+					pr_err("Fill top-down unbind of vma.node=%llx + %llx failed with err=%d\n",
+					       vma->node.start, vma->node.size,
+					       err);
+					goto err;
+				}
+			}
+
+			/* And again from the bottom */
+			flags = PIN_OFFSET_FIXED | PIN_USER;
+			list_for_each_entry(obj, &objects, batch_pool_link) {
+				vma = vma_lookup(obj, &ppgtt->base);
+				if (IS_ERR(vma))
+					continue;
+
+				err = i915_vma_pin(vma, 0, 0, flags);
+				if (err) {
+					pr_err("Fill bottom-up failed with err=%d on size=%lu pages (prime=%lu)\n", err, npages, prime);
+					goto err;
+				}
+
+				i915_vma_unpin(vma);
+				flags += obj->base.size;
+			}
+
+			flags = PIN_OFFSET_FIXED | PIN_USER;
+			list_for_each_entry(obj, &objects, batch_pool_link) {
+				vma = vma_lookup(obj, &ppgtt->base);
+				if (IS_ERR(vma))
+					continue;
+
+				if (!drm_mm_node_allocated(&vma->node) ||
+				    i915_vma_misplaced(vma, 0, 0, flags)) {
+					pr_err("Fill top-down moved vma.node=%llx + %llx, expected offset %llx\n",
+					       vma->node.start, vma->node.size,
+					       flags & PAGE_MASK);
+					err = -EINVAL;
+					goto err;
+				}
+
+				err = i915_vma_unbind(vma);
+				if (err) {
+					pr_err("Fill top-down unbind of vma.node=%llx + %llx failed with err=%d\n",
+					       vma->node.start, vma->node.size,
+					       err);
+					goto err;
+				}
+
+				flags += obj->base.size;
+			}
+		}
+
+		list_for_each_entry_safe(obj, on, &objects, batch_pool_link) {
+			list_del(&obj->batch_pool_link);
+			vma = vma_lookup(obj, &ppgtt->base);
+			if (!IS_ERR(vma))
+				i915_vma_close(vma);
+
+			i915_gem_object_put(obj);
+		}
+	}
+err:
+
+	list_for_each_entry_safe(obj, on, &objects, batch_pool_link) {
+		list_del(&obj->batch_pool_link);
+		vma = vma_lookup(obj, &ppgtt->base);
+		if (!IS_ERR(vma))
+			i915_vma_close(vma);
+
+		i915_gem_object_put(obj);
+	}
+
+	i915_ppgtt_close(&ppgtt->base);
+	i915_ppgtt_put(ppgtt);
+err_unlock:
+	mutex_unlock(&dev_priv->drm.struct_mutex);
+	return err;
+}
+
 int i915_gem_gtt_live_selftests(struct drm_i915_private *i915)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(igt_ppgtt_alloc),
+		SUBTEST(igt_ppgtt_fill),
 	};
 
 	return i915_subtests(tests, i915);
-- 
2.11.0

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