[PATCH -next 17/18] drm/vmwgfx: Don't refcount cotable lookups during command buffer validation

From: Thomas Hellstrom <thellstrom@vmware.com>
To: dri-devel@lists.freedesktop.org
Cc: Thomas Hellstrom <thellstrom@vmware.com>,
	linux-graphics-maintainer@vmware.com
Subject: [PATCH -next 17/18] drm/vmwgfx: Don't refcount cotable lookups during command buffer validation
Date: Wed, 26 Sep 2018 18:18:38 +0200	[thread overview]
Message-ID: <20180926161839.4549-17-thellstrom@vmware.com> (raw)
In-Reply-To: <20180926161839.4549-1-thellstrom@vmware.com>

The typical pattern of these lookups are
-Lookup
-Put on validate list if not already there.
-Unreference
And since we are the exclusive user of the context during lookup time,
we can be sure that the resource will stay alive during the sequence.
So avoid taking a reference during lookup, and also avoid unreferencing
when done. There are two users outside of command buffer validation and
those are refcounted explicitly.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_context.c | 5 ++---
 drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 5 -----
 drivers/gpu/drm/vmwgfx/vmwgfx_shader.c  | 3 ++-
 drivers/gpu/drm/vmwgfx/vmwgfx_so.c      | 3 ++-
 4 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_context.c b/drivers/gpu/drm/vmwgfx/vmwgfx_context.c
index 24d7c81081ae..14bd760a62fd 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_context.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_context.c
@@ -861,9 +861,8 @@ struct vmw_resource *vmw_context_cotable(struct vmw_resource *ctx,
 	if (cotable_type >= SVGA_COTABLE_DX10_MAX)
 		return ERR_PTR(-EINVAL);
 
-	return vmw_resource_reference
-		(container_of(ctx, struct vmw_user_context, res)->
-		 cotables[cotable_type]);
+	return container_of(ctx, struct vmw_user_context, res)->
+		cotables[cotable_type];
 }
 
 /**
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 13db7efcb89c..dfa2d19274d5 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -372,7 +372,6 @@ static int vmw_resource_context_res_add(struct vmw_private *dev_priv,
 				continue;
 
 			ret = vmw_resource_val_add(sw_context, res);
-			vmw_resource_unreference(&res);
 			if (unlikely(ret != 0))
 				return ret;
 		}
@@ -1266,7 +1265,6 @@ static int vmw_cmd_dx_define_query(struct vmw_private *dev_priv,
 
 	cotable_res = vmw_context_cotable(ctx_node->ctx, SVGA_COTABLE_DXQUERY);
 	ret = vmw_cotable_notify(cotable_res, cmd->q.queryId);
-	vmw_resource_unreference(&cotable_res);
 
 	return ret;
 }
@@ -2578,7 +2576,6 @@ static int vmw_cmd_dx_view_define(struct vmw_private *dev_priv,
 
 	res = vmw_context_cotable(ctx_node->ctx, vmw_view_cotables[view_type]);
 	ret = vmw_cotable_notify(res, cmd->defined_id);
-	vmw_resource_unreference(&res);
 	if (unlikely(ret != 0))
 		return ret;
 
@@ -2675,7 +2672,6 @@ static int vmw_cmd_dx_so_define(struct vmw_private *dev_priv,
 	res = vmw_context_cotable(ctx_node->ctx, vmw_so_cotables[so_type]);
 	cmd = container_of(header, typeof(*cmd), header);
 	ret = vmw_cotable_notify(res, cmd->defined_id);
-	vmw_resource_unreference(&res);
 
 	return ret;
 }
@@ -2806,7 +2802,6 @@ static int vmw_cmd_dx_define_shader(struct vmw_private *dev_priv,
 
 	res = vmw_context_cotable(ctx_node->ctx, SVGA_COTABLE_DXSHADER);
 	ret = vmw_cotable_notify(res, cmd->body.shaderId);
-	vmw_resource_unreference(&res);
 	if (ret)
 		return ret;
 
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
index 6915c8258e6b..bf32fe446219 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
@@ -636,7 +636,8 @@ int vmw_dx_shader_add(struct vmw_cmdbuf_res_manager *man,
 
 	res = &shader->res;
 	shader->ctx = ctx;
-	shader->cotable = vmw_context_cotable(ctx, SVGA_COTABLE_DXSHADER);
+	shader->cotable = vmw_resource_reference
+		(vmw_context_cotable(ctx, SVGA_COTABLE_DXSHADER));
 	shader->id = user_key;
 	shader->committed = false;
 	INIT_LIST_HEAD(&shader->cotable_head);
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_so.c b/drivers/gpu/drm/vmwgfx/vmwgfx_so.c
index aaabb87ac3af..bc8bb690f1ea 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_so.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_so.c
@@ -366,7 +366,8 @@ int vmw_view_add(struct vmw_cmdbuf_res_manager *man,
 	res = &view->res;
 	view->ctx = ctx;
 	view->srf = vmw_resource_reference(srf);
-	view->cotable = vmw_context_cotable(ctx, vmw_view_cotables[view_type]);
+	view->cotable = vmw_resource_reference
+		(vmw_context_cotable(ctx, vmw_view_cotables[view_type]));
 	view->view_type = view_type;
 	view->view_id = user_key;
 	view->cmd_size = cmd_size;
-- 
2.14.4

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