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vmwgfx: Add comments for buffer pinning code 

Signed-off-by: Jakob Bornecrantz <jakob@vmware.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Jakob Bornecrantz 2011-10-04 20:13:14 +02:00 committed by Dave Airlie
parent de12d44fca
commit 497a3ff987
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
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@ -706,6 +706,10 @@ static struct drm_framebuffer_funcs vmw_framebuffer_dmabuf_funcs = {
.create_handle = vmw_framebuffer_create_handle,
};
/**
* We need to reserve the start of vram because the host might
* scribble to it at mode changes, so we need to reserve it.
*/
static int vmw_surface_dmabuf_pin(struct vmw_framebuffer *vfb)
{
struct vmw_private *dev_priv = vmw_priv(vfb->base.dev);
@ -729,6 +733,9 @@ static int vmw_surface_dmabuf_pin(struct vmw_framebuffer *vfb)
return ret;
}
/**
* See vmw_surface_dmabuf_pin.
*/
static int vmw_surface_dmabuf_unpin(struct vmw_framebuffer *vfb)
{
struct ttm_buffer_object *bo;
@ -745,6 +752,9 @@ static int vmw_surface_dmabuf_unpin(struct vmw_framebuffer *vfb)
return 0;
}
/**
* Pin the dmabuffer to the start of vram.
*/
static int vmw_framebuffer_dmabuf_pin(struct vmw_framebuffer *vfb)
{
struct vmw_private *dev_priv = vmw_priv(vfb->base.dev);