From b9ffd80ed659c559152c042e74741f4f60cac691 Mon Sep 17 00:00:00 2001
From: Brad Volkin <bradley.d.volkin@intel.com>
Date: Thu, 11 Dec 2014 12:13:10 -0800
Subject: [PATCH] drm/i915: Use batch length instead of object size in command
 parser

Previously we couldn't trust the user-supplied batch length because
it came directly from userspace (i.e. untrusted code). It would have
affected what commands software parsed without regard to what hardware
would actually execute, leaving a potential hole.

With the parser now copying the user supplied batch buffer and writing
MI_NOP commands to any space after the copied region, we can safely use
the batch length input. This should be a performance win as the actual
batch length is frequently much smaller than the allocated object size.

v2: Fix handling of non-zero batch_start_offset

Issue: VIZ-4719
Signed-off-by: Brad Volkin <bradley.d.volkin@intel.com>
Reviewed-By: Jon Bloomfield <jon.bloomfield@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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