[Intel-gfx] [PATCH 6/7] drm/i915/gem: Break apart the early i915_vma_pin from execbuf object lookup

[Chris Wilson]

As a prelude to the next step where we want to perform all the object
allocations together under the same lock, we first must delay the
i915_vma_pin() as that implicitly does the allocations for us, one by
one. As it only does the allocations one by one, it is not allowed to
wait/evict, whereas pulling all the allocations together the entire set
can be scheduled as one.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 43 +++++++++++--------
 1 file changed, 25 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 60926209b1fc..46fcbdf8161c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -664,16 +664,6 @@ eb_add_vma(struct i915_execbuffer *eb,
 						    eb->lut_size)]);
 	}
 
-	if (eb_pin_vma(eb, entry, ev)) {
-		if (entry->offset != vma->node.start) {
-			entry->offset = vma->node.start | UPDATE;
-			eb->args->flags |= __EXEC_HAS_RELOC;
-		}
-	} else {
-		eb_unreserve_vma(ev);
-		list_add_tail(&ev->bind_link, &eb->unbound);
-	}
-
 	list_add_tail(&ev->lock_link, &eb->lock);
 }
 
@@ -1339,18 +1329,37 @@ static int eb_prepare_vma(struct eb_vma *ev)
 	return 0;
 }
 
-static int eb_reserve(struct i915_execbuffer *eb)
+static int eb_reserve_vm(struct i915_execbuffer *eb)
 {
 	const unsigned int count = eb->buffer_count;
 	struct i915_address_space *vm = eb->context->vm;
-	struct list_head last;
 	unsigned int i, pass;
-	struct eb_vma *ev;
 	int err = 0;
 
+	for (i = 0; i < count; i++) {
+		struct drm_i915_gem_exec_object2 *entry = &eb->exec[i];
+		struct eb_vma *ev = &eb->vma[i];
+
+		if (eb_pin_vma(eb, entry, ev)) {
+			struct i915_vma *vma = ev->vma;
+
+			if (entry->offset != vma->node.start) {
+				entry->offset = vma->node.start | UPDATE;
+				eb->args->flags |= __EXEC_HAS_RELOC;
+			}
+		} else {
+			eb_unreserve_vma(ev);
+			list_add_tail(&ev->bind_link, &eb->unbound);
+		}
+	}
+	if (list_empty(&eb->unbound))
+		return 0;
+
 	pass = 0;
 	do {
 		struct eb_vm_work *work;
+		struct list_head last;
+		struct eb_vma *ev;
 
 		list_for_each_entry(ev, &eb->unbound, bind_link) {
 			err = eb_prepare_vma(ev);
@@ -2404,11 +2413,9 @@ static int eb_relocate(struct i915_execbuffer *eb)
 	if (err)
 		return err;
 
-	if (!list_empty(&eb->unbound)) {
-		err = eb_reserve(eb);
-		if (err)
-			return err;
-	}
+	err = eb_reserve_vm(eb);
+	if (err)
+		return err;
 
 	/* The objects are in their final locations, apply the relocations. */
 	if (eb->args->flags & __EXEC_HAS_RELOC) {
-- 
2.20.1