copy_to/from_user returns the number of bytes remaining to be copied but
we want to return -EFAULT.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NRob Clark <robdclark@gmail.com>

By default, if using $debugfs/.../rd to log cmdstream, only the
cmdstream buffers themselves are logged.  But in some cases we want
to capture other buffers in the submit (to see VBO's or shaders).
So add a mod-param knob to control this.
Signed-off-by: NRob Clark <robdclark@gmail.com>

(reduce the noise in next patch)
Signed-off-by: NRob Clark <robdclark@gmail.com>

Before we can add vmap shrinking, we really need to know which vmap'ings
are currently being used.  So switch to get/put interface.  Stubbed put
fxns for now.
Signed-off-by: NRob Clark <robdclark@gmail.com>

Some, but not all, callers of obj->vmap() would check if return
IS_ERR().  So let's actually return an error if vmap() fails.  And fixup
the call-sites that were not handling this properly.
Signed-off-by: NRob Clark <robdclark@gmail.com>

Signed-off-by: NRob Clark <robdclark@gmail.com>

To ease debugging, add debugfs file which can be cat/tail'd to log
submits, along with fence #.  If GPU hangs, you can look at 'gpu'
debugfs file to find last completed fence and current register state,
and compare with logged rd file to narrow down the DRAW_INDX which
triggered the GPU hang.
Signed-off-by: NRob Clark <robdclark@gmail.com>