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drm/i915/cmdparser: Ignore Length operands during command matching

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commit 926abff21a8f29ef159a3ac893b05c6e50e043c3 upstream.

Some of the gen instruction macros (e.g. MI_DISPLAY_FLIP) have the
length directly encoded in them. Since these are used directly in
the tables, the Length becomes part of the comparison used for
matching during parsing. Thus, if the cmd being parsed has a
different length to that in the table, it is not matched and the
cmd is accepted via the default variable length path.

Fix by masking out everything except the Opcode in the cmd tables

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: Jon Bloomfield <jon.bloomfield@intel.com>
Reviewed-by: Chris Wilson <chris.p.wilson@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jon Bloomfield 2018-09-20 09:45:10 -07:00 committed by Greg Kroah-Hartman
parent 6e53c71a69
commit a7bda639a1
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/i915_cmd_parser.c
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@ -187,7 +187,7 @@ struct drm_i915_cmd_table {
#define CMD(op, opm, f, lm, fl, ...) \ #define CMD(op, opm, f, lm, fl, ...) \
{ \ { \
.flags = (fl) | ((f) ? CMD_DESC_FIXED : 0), \ .flags = (fl) | ((f) ? CMD_DESC_FIXED : 0), \
.cmd = { (op), ~0u << (opm) }, \ .cmd = { (op & ~0u << (opm)), ~0u << (opm) }, \
.length = { (lm) }, \ .length = { (lm) }, \
__VA_ARGS__ \ __VA_ARGS__ \
} }