[PATCH 19/27] drm/i915: Split vma exec_link/evict_link

Chris Wilson chris at chris-wilson.co.uk
Fri Apr 21 15:59:31 UTC 2017


Currently the vma has one link member that is used for both holding its
place in the execbuf reservation list, and in any eviction list. This
dual property is quite tricky and error prone.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_evict.c      | 14 ++++++-------
 drivers/gpu/drm/i915/i915_gem_execbuffer.c | 32 +++++++++++++++---------------
 drivers/gpu/drm/i915/i915_vma.h            |  7 +++++--
 3 files changed, 28 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index 891247d79299..204a2d9288ae 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -62,7 +62,7 @@ mark_free(struct drm_mm_scan *scan,
 	if (flags & PIN_NONFAULT && !list_empty(&vma->obj->userfault_link))
 		return false;
 
-	list_add(&vma->exec_list, unwind);
+	list_add(&vma->evict_link, unwind);
 	return drm_mm_scan_add_block(scan, &vma->node);
 }
 
@@ -154,7 +154,7 @@ i915_gem_evict_something(struct i915_address_space *vm,
 	} while (*++phase);
 
 	/* Nothing found, clean up and bail out! */
-	list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
+	list_for_each_entry_safe(vma, next, &eviction_list, evict_link) {
 		ret = drm_mm_scan_remove_block(&scan, &vma->node);
 		BUG_ON(ret);
 	}
@@ -200,16 +200,16 @@ i915_gem_evict_something(struct i915_address_space *vm,
 	 * calling unbind (which may remove the active reference
 	 * of any of our objects, thus corrupting the list).
 	 */
-	list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
+	list_for_each_entry_safe(vma, next, &eviction_list, evict_link) {
 		if (drm_mm_scan_remove_block(&scan, &vma->node))
 			__i915_vma_pin(vma);
 		else
-			list_del(&vma->exec_list);
+			list_del(&vma->evict_link);
 	}
 
 	/* Unbinding will emit any required flushes */
 	ret = 0;
-	list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
+	list_for_each_entry_safe(vma, next, &eviction_list, evict_link) {
 		__i915_vma_unpin(vma);
 		if (ret == 0)
 			ret = i915_vma_unbind(vma);
@@ -322,10 +322,10 @@ int i915_gem_evict_for_node(struct i915_address_space *vm,
 		 * reference) another in our eviction list.
 		 */
 		__i915_vma_pin(vma);
-		list_add(&vma->exec_list, &eviction_list);
+		list_add(&vma->evict_link, &eviction_list);
 	}
 
-	list_for_each_entry_safe(vma, next, &eviction_list, exec_list) {
+	list_for_each_entry_safe(vma, next, &eviction_list, evict_link) {
 		__i915_vma_unpin(vma);
 		if (ret == 0)
 			ret = i915_vma_unbind(vma);
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 2e9084296ad6..d5d0d200e026 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -137,7 +137,7 @@ eb_reset(struct i915_execbuffer *eb)
 {
 	struct i915_vma *vma;
 
-	list_for_each_entry(vma, &eb->vmas, exec_list) {
+	list_for_each_entry(vma, &eb->vmas, exec_link) {
 		eb_unreserve_vma(vma);
 		i915_vma_put(vma);
 		vma->exec_entry = NULL;
@@ -150,7 +150,7 @@ eb_reset(struct i915_execbuffer *eb)
 static struct i915_vma *
 eb_get_batch(struct i915_execbuffer *eb)
 {
-	struct i915_vma *vma = list_entry(eb->vmas.prev, typeof(*vma), exec_list);
+	struct i915_vma *vma = list_entry(eb->vmas.prev, typeof(*vma), exec_link);
 
 	/*
 	 * SNA is doing fancy tricks with compressing batch buffers, which leads
@@ -227,7 +227,7 @@ eb_lookup_vmas(struct i915_execbuffer *eb)
 		}
 
 		/* Transfer ownership from the objects list to the vmas list. */
-		list_add_tail(&vma->exec_list, &eb->vmas);
+		list_add_tail(&vma->exec_link, &eb->vmas);
 		list_del_init(&obj->obj_exec_link);
 
 		vma->exec_entry = &eb->exec[i];
@@ -286,7 +286,7 @@ static void eb_destroy(struct i915_execbuffer *eb)
 {
 	struct i915_vma *vma;
 
-	list_for_each_entry(vma, &eb->vmas, exec_list) {
+	list_for_each_entry(vma, &eb->vmas, exec_link) {
 		if (!vma->exec_entry)
 			continue;
 
@@ -752,7 +752,7 @@ static int eb_relocate(struct i915_execbuffer *eb)
 	struct i915_vma *vma;
 	int ret = 0;
 
-	list_for_each_entry(vma, &eb->vmas, exec_list) {
+	list_for_each_entry(vma, &eb->vmas, exec_link) {
 		ret = eb_relocate_vma(vma, eb);
 		if (ret)
 			break;
@@ -905,7 +905,7 @@ static int eb_reserve(struct i915_execbuffer *eb)
 		struct drm_i915_gem_exec_object2 *entry;
 		bool need_fence, need_mappable;
 
-		vma = list_first_entry(&eb->vmas, struct i915_vma, exec_list);
+		vma = list_first_entry(&eb->vmas, struct i915_vma, exec_link);
 		obj = vma->obj;
 		entry = vma->exec_entry;
 
@@ -921,12 +921,12 @@ static int eb_reserve(struct i915_execbuffer *eb)
 		need_mappable = need_fence || need_reloc_mappable(vma);
 
 		if (entry->flags & EXEC_OBJECT_PINNED)
-			list_move_tail(&vma->exec_list, &pinned_vmas);
+			list_move_tail(&vma->exec_link, &pinned_vmas);
 		else if (need_mappable) {
 			entry->flags |= __EXEC_OBJECT_NEEDS_MAP;
-			list_move(&vma->exec_list, &ordered_vmas);
+			list_move(&vma->exec_link, &ordered_vmas);
 		} else
-			list_move_tail(&vma->exec_list, &ordered_vmas);
+			list_move_tail(&vma->exec_link, &ordered_vmas);
 
 		obj->base.pending_read_domains = I915_GEM_GPU_DOMAINS & ~I915_GEM_DOMAIN_COMMAND;
 		obj->base.pending_write_domain = 0;
@@ -951,7 +951,7 @@ static int eb_reserve(struct i915_execbuffer *eb)
 		int ret = 0;
 
 		/* Unbind any ill-fitting objects or pin. */
-		list_for_each_entry(vma, &eb->vmas, exec_list) {
+		list_for_each_entry(vma, &eb->vmas, exec_link) {
 			if (!drm_mm_node_allocated(&vma->node))
 				continue;
 
@@ -964,7 +964,7 @@ static int eb_reserve(struct i915_execbuffer *eb)
 		}
 
 		/* Bind fresh objects */
-		list_for_each_entry(vma, &eb->vmas, exec_list) {
+		list_for_each_entry(vma, &eb->vmas, exec_link) {
 			if (drm_mm_node_allocated(&vma->node))
 				continue;
 
@@ -978,7 +978,7 @@ static int eb_reserve(struct i915_execbuffer *eb)
 			return ret;
 
 		/* Decrement pin count for bound objects */
-		list_for_each_entry(vma, &eb->vmas, exec_list)
+		list_for_each_entry(vma, &eb->vmas, exec_link)
 			eb_unreserve_vma(vma);
 
 		ret = i915_gem_evict_vm(eb->vm, true);
@@ -1067,7 +1067,7 @@ eb_relocate_slow(struct i915_execbuffer *eb)
 	if (ret)
 		goto err;
 
-	list_for_each_entry(vma, &eb->vmas, exec_list) {
+	list_for_each_entry(vma, &eb->vmas, exec_link) {
 		int idx = vma->exec_entry - eb->exec;
 
 		ret = eb_relocate_vma_slow(vma, eb, reloc + reloc_offset[idx]);
@@ -1093,7 +1093,7 @@ eb_move_to_gpu(struct i915_execbuffer *eb)
 	struct i915_vma *vma;
 	int ret;
 
-	list_for_each_entry(vma, &eb->vmas, exec_list) {
+	list_for_each_entry(vma, &eb->vmas, exec_link) {
 		struct drm_i915_gem_object *obj = vma->obj;
 
 		if (vma->exec_entry->flags & EXEC_OBJECT_CAPTURE) {
@@ -1308,7 +1308,7 @@ eb_move_to_active(struct i915_execbuffer *eb)
 {
 	struct i915_vma *vma;
 
-	list_for_each_entry(vma, &eb->vmas, exec_list) {
+	list_for_each_entry(vma, &eb->vmas, exec_link) {
 		struct drm_i915_gem_object *obj = vma->obj;
 
 		obj->base.write_domain = obj->base.pending_write_domain;
@@ -1382,7 +1382,7 @@ static struct i915_vma *eb_parse(struct i915_execbuffer *eb, bool is_master)
 		memset(&eb->shadow_exec_entry, 0, sizeof(*vma->exec_entry));
 	vma->exec_entry->flags = __EXEC_OBJECT_HAS_PIN;
 	i915_gem_object_get(shadow_batch_obj);
-	list_add_tail(&vma->exec_list, &eb->vmas);
+	list_add_tail(&vma->exec_link, &eb->vmas);
 
 out:
 	i915_gem_object_unpin_pages(shadow_batch_obj);
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index 2e03f81dddbe..4d827300d1a8 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -100,8 +100,11 @@ struct i915_vma {
 	struct list_head obj_link; /* Link in the object's VMA list */
 	struct rb_node obj_node;
 
-	/** This vma's place in the batchbuffer or on the eviction list */
-	struct list_head exec_list;
+	/** This vma's place in the execbuf reservation list */
+	struct list_head exec_link;
+
+	/** This vma's place in the eviction list */
+	struct list_head evict_link;
 
 	/**
 	 * Used for performing relocations during execbuffer insertion.
-- 
2.11.0



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