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drm/i915: Skip over MI_NOOP when parsing

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Though less likely in practice, igt uses MI_NOOP frequently to pad out
its batch buffers. The lookup and valiation of so many MI_NOOP command
descriptions is noticeable, though the side-effect of poisoning the
last-validated-command cache is more likely to impact upon real CS.

Testcase: igt/gen9_exec_parse/bb-large
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201001102632.18789-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-10-01 11:26:32 +01:00
parent b05734720d
commit a6c5e2aea7
1 changed files with 32 additions and 33 deletions
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11
drivers/gpu/drm/i915/i915_cmd_parser.c
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@ -1452,12 +1452,10 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine,
* space. Parsing should be faster in some cases this way.
*/
batch_end = cmd + batch_length / sizeof(*batch_end);
do {
u32 length;
if (*cmd == MI_BATCH_BUFFER_END)
break;
while (*cmd != MI_BATCH_BUFFER_END) {
u32 length = 1;
if (*cmd != MI_NOOP) { /* MI_NOOP == 0 */
desc = find_cmd(engine, *cmd, desc, &default_desc);
if (!desc) {
DRM_DEBUG("CMD: Unrecognized command: 0x%08X\n", *cmd);
@ -1490,6 +1488,7 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine,
jump_whitelist);
break;
}
}
if (!IS_ERR_OR_NULL(jump_whitelist))
__set_bit(offset, jump_whitelist);
@ -1501,7 +1500,7 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine,
ret = -EINVAL;
break;
}
} while (1);
}
if (trampoline) {
/*