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drm/ttm, drm/vmwgfx: Use RCU locking for object lookups v3

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The mostly used lookup+get put+potential_destroy path of TTM objects
is converted to use RCU locks. This will substantially decrease the amount
of locked bus cycles during normal operation.
Since we use kfree_rcu to free the objects, no rcu synchronization is needed
at module unload time.

v2: Don't touch include/linux/kref.h
v3: Adapt to kref_get_unless_zero return value change

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Thomas Hellstrom
2012-11-06 11:31:50 +00:00
committed by Dave Airlie
parent 4b20db3de8
commit cdad05216c
3 changed files with 19 additions and 23 deletions
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8
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
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@@ -351,7 +351,7 @@ static void vmw_user_context_free(struct vmw_resource *res)
container_of(res, struct vmw_user_context, res);
struct vmw_private *dev_priv = res->dev_priv;
kfree(ctx);
ttm_base_object_kfree(ctx, base);
ttm_mem_global_free(vmw_mem_glob(dev_priv),
vmw_user_context_size);
}
@@ -1143,7 +1143,7 @@ static void vmw_user_surface_free(struct vmw_resource *res)
kfree(srf->offsets);
kfree(srf->sizes);
kfree(srf->snooper.image);
kfree(user_srf);
ttm_base_object_kfree(user_srf, base);
ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
}
@@ -1571,7 +1571,7 @@ static void vmw_user_dmabuf_destroy(struct ttm_buffer_object *bo)
{
struct vmw_user_dma_buffer *vmw_user_bo = vmw_user_dma_buffer(bo);
kfree(vmw_user_bo);
ttm_base_object_kfree(vmw_user_bo, base);
}
static void vmw_user_dmabuf_release(struct ttm_base_object **p_base)
@@ -1759,7 +1759,7 @@ static void vmw_user_stream_free(struct vmw_resource *res)
container_of(res, struct vmw_user_stream, stream.res);
struct vmw_private *dev_priv = res->dev_priv;
kfree(stream);
ttm_base_object_kfree(stream, base);
ttm_mem_global_free(vmw_mem_glob(dev_priv),
vmw_user_stream_size);
}