drm/vmwgfx: Assign eviction priorities to resources

TTM provides a means to assign eviction priorities to buffer object. This
means that all buffer objects with a lower priority will be evicted first
on memory pressure.
Use this to make sure surfaces and in particular non-dirty surfaces are
evicted first. Evicting in particular shaders, cotables and contexts imply
a significant performance hit on vmwgfx, so make sure these resources are
evicted last.
Some buffer objects are sub-allocated in user-space which means we can have
many resources attached to a single buffer object or resource. In that case
the buffer object is given the highest priority of the attached resources.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Deepak Rawat <drawat@vmware.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
index d310d21f0d54..e139fdfd1635 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
@@ -95,6 +95,8 @@ static const struct vmw_res_func vmw_gb_shader_func = {
 	.res_type = vmw_res_shader,
 	.needs_backup = true,
 	.may_evict = true,
+	.prio = 3,
+	.dirty_prio = 3,
 	.type_name = "guest backed shaders",
 	.backup_placement = &vmw_mob_placement,
 	.create = vmw_gb_shader_create,
@@ -106,7 +108,9 @@ static const struct vmw_res_func vmw_gb_shader_func = {
 static const struct vmw_res_func vmw_dx_shader_func = {
 	.res_type = vmw_res_shader,
 	.needs_backup = true,
-	.may_evict = false,
+	.may_evict = true,
+	.prio = 3,
+	.dirty_prio = 3,
 	.type_name = "dx shaders",
 	.backup_placement = &vmw_mob_placement,
 	.create = vmw_dx_shader_create,
@@ -423,7 +427,7 @@ static int vmw_dx_shader_create(struct vmw_resource *res)
 
 	WARN_ON_ONCE(!shader->committed);
 
-	if (!list_empty(&res->mob_head)) {
+	if (vmw_resource_mob_attached(res)) {
 		mutex_lock(&dev_priv->binding_mutex);
 		ret = vmw_dx_shader_unscrub(res);
 		mutex_unlock(&dev_priv->binding_mutex);