[PATCH v2 2/3] drm/vmwgfx: Support hw_destroy for userspace managed surfaces

[Maaz Mombasawala <maaz.mombasawala@xxxxxxxxxxxx>]

A userspace may create a userspace managed surface but not destroy it,
add hw_destroy function for userspace surfaces so that vmwgfx records the
destroy command and submits it when the userspace context is destroyed.

Signed-off-by: Maaz Mombasawala <maaz.mombasawala@xxxxxxxxxxxx>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.h     |  1 +
 drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c |  7 ++++-
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 41 +++++++++++++++++++++++++
 3 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index 67f75d366f9d..6cb3f648eaad 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -267,6 +267,7 @@ struct vmw_surface {
 struct vmw_cmdbuf_surface {
 	struct vmw_surface surface;
 	struct ttm_base_object base;
+	bool cmdbuf_destroy;
 };
 
 struct vmw_fifo_state {
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 0468c9f4f293..70f816062fd2 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -3374,6 +3374,8 @@ static int vmw_cmd_destroy_gb_surface(struct vmw_private *dev_priv,
 				      SVGA3dCmdHeader *header)
 {
 	VMW_DECLARE_CMD_VAR(*cmd, SVGA3dCmdDestroyGBSurface);
+	struct vmw_resource *res;
+	struct vmw_cmdbuf_surface *surface;
 	int ret;
 
 	cmd = container_of(header, typeof(*cmd), header);
@@ -3382,10 +3384,13 @@ static int vmw_cmd_destroy_gb_surface(struct vmw_private *dev_priv,
 		return -EINVAL;
 
 	ret = vmw_cmd_res_check(dev_priv, sw_context, vmw_res_surface,
-				VMW_RES_DIRTY_NONE, NULL, &cmd->body.sid, NULL);
+				VMW_RES_DIRTY_NONE, NULL, &cmd->body.sid, &res);
 	if (unlikely(ret))
 		return ret;
 
+	surface = vmw_res_to_cmdbuf_srf(res);
+	surface->cmdbuf_destroy = true;
+
 	ret = vmw_cmdbuf_surface_destroy(dev_priv, sw_context, cmd->body.sid);
 	if (unlikely(ret))
 		return ret;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index 4dfce3ea104c..26a71af79a39 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -2403,6 +2403,44 @@ static void vmw_cmdbuf_surface_base_release(struct ttm_base_object **p_base)
 }
 
 
+static void vmw_cmdbuf_surface_hw_destroy(struct vmw_resource *res)
+{
+	struct vmw_private *dev_priv = res->dev_priv;
+	struct vmw_cmdbuf_surface *surface;
+	struct {
+		SVGA3dCmdHeader header;
+		SVGA3dCmdDestroyGBSurface body;
+	} *cmd;
+
+	if (res->id == -1)
+		return;
+
+	surface = vmw_res_to_cmdbuf_srf(res);
+	/**
+	 * If userspace is submitting a destroy command there is no need for
+	 * kernel to do so.
+	 */
+	if (surface->cmdbuf_destroy)
+		return;
+
+	mutex_lock(&dev_priv->binding_mutex);
+	vmw_view_surface_list_destroy(dev_priv, &surface->surface.view_list);
+	vmw_binding_res_list_scrub(&res->binding_head);
+
+	cmd = VMW_CMD_RESERVE(dev_priv, sizeof(*cmd));
+	if (unlikely(!cmd)) {
+		mutex_unlock(&dev_priv->binding_mutex);
+		return;
+	}
+
+	cmd->header.id = SVGA_3D_CMD_DESTROY_GB_SURFACE;
+	cmd->header.size = sizeof(cmd->body);
+	cmd->body.sid = res->id;
+	vmw_cmd_commit(dev_priv, sizeof(*cmd));
+	mutex_unlock(&dev_priv->binding_mutex);
+}
+
+
 int vmw_cmdbuf_surface_define(struct vmw_private *dev_priv,
 			      struct vmw_sw_context *sw_context,
 			      struct vmw_surface_metadata *metadata,
@@ -2484,6 +2522,9 @@ int vmw_cmdbuf_surface_define(struct vmw_private *dev_priv,
 		return ret;
 	}
 
+	res->hw_destroy = vmw_cmdbuf_surface_hw_destroy;
+	surface->cmdbuf_destroy = false;
+
 	return 0;
 }
 
-- 
2.43.0