drm/i915: Add support for mandatory cmdparsing

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The existing cmdparser for gen7 can be bypassed by specifying
batch_len=0 in the execbuf call. This is safe because bypassing
simply reduces the cmd-set available.

In a later patch we will introduce cmdparsing for gen9, as a
security measure, which must be strictly enforced since without
it we are vulnerable to DoS attacks.

Introduce the concept of 'required' cmd parsing that cannot be
bypassed by submitting zero-length bb's.

v2: rebase (Mika)
v2: rebase (Mika)
v3: fix conflict on engine flags (Mika)

Signed-off-by: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Chris Wilson <chris.p.wilson@intel.com>

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This commit is contained in:

Jon Bloomfield 2018-08-01 09:33:59 -07:00

parent 66d8aba1cd

commit 311a50e76a

3 changed files with 15 additions and 7 deletions

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3

drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c

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13

drivers/gpu/drm/i915/gt/intel_engine_types.h

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6

drivers/gpu/drm/i915/i915_cmd_parser.c

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