tree: git://anongit.freedesktop.org/drm-intel for-linux-next-fixes head: add78d27d388520cbed6a7bf01d1e0afa183314d commit: 04dc41776145f539ab6da442cb633e45539bed9a [4/16] drm/i915/gt: Prevent timeslicing into unpreemptable requests config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3d8149c2a1228609fd7d7c91a04681304a2f0ca9) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu git checkout 04dc41776145f539ab6da442cb633e45539bed9a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>, old ones prefixed by <<): In file included from drivers/gpu/drm/i915/gt/intel_lrc.c:5953: engine_heartbeat_disable(engine); ~~~~~~~~~~~~~~~~~~~~~~~~ ^ drivers/gpu/drm/i915/gt/selftest_lrc.c:54:13: note: 'engine_heartbeat_disable' declared here static void engine_heartbeat_disable(struct intel_engine_cs *engine, ^ drivers/gpu/drm/i915/gt/selftest_lrc.c:1402:33: error: too few arguments to function call, expected 2, have 1 engine_heartbeat_enable(engine); ~~~~~~~~~~~~~~~~~~~~~~~ ^ drivers/gpu/drm/i915/gt/selftest_lrc.c:64:13: note: 'engine_heartbeat_enable' declared here static void engine_heartbeat_enable(struct intel_engine_cs *engine, ^ 2 errors generated. vim +1333 drivers/gpu/drm/i915/gt/selftest_lrc.c 1300 1301 static int live_timeslice_nopreempt(void *arg) 1302 { 1303 struct intel_gt *gt = arg; 1304 struct intel_engine_cs *engine; 1305 enum intel_engine_id id; 1306 struct igt_spinner spin; 1307 int err = 0; 1308 1309 /* 1310 * We should not timeslice into a request that is marked with 1311 * I915_REQUEST_NOPREEMPT. 1312 */ 1313 if (!IS_ACTIVE(CONFIG_DRM_I915_TIMESLICE_DURATION)) 1314 return 0; 1315 1316 if (igt_spinner_init(&spin, gt)) 1317 return -ENOMEM; 1318 1319 for_each_engine(engine, gt, id) { 1320 struct intel_context *ce; 1321 struct i915_request *rq; 1322 unsigned long timeslice; 1323 1324 if (!intel_engine_has_preemption(engine)) 1325 continue; 1326 1327 ce = intel_context_create(engine); 1328 if (IS_ERR(ce)) { 1329 err = PTR_ERR(ce); 1330 break; 1331 } 1332 1334 timeslice = xchg(&engine->props.timeslice_duration_ms, 1); 1335 1336 /* Create an unpreemptible spinner */ 1337 1338 rq = igt_spinner_create_request(&spin, ce, MI_ARB_CHECK); 1339 intel_context_put(ce); 1340 if (IS_ERR(rq)) { 1341 err = PTR_ERR(rq); 1342 goto out_heartbeat; 1343 } 1344 1345 i915_request_get(rq); 1346 i915_request_add(rq); 1347 1348 if (!igt_wait_for_spinner(&spin, rq)) { 1349 i915_request_put(rq); 1350 err = -ETIME; 1351 goto out_spin; 1352 } 1353 1354 set_bit(I915_FENCE_FLAG_NOPREEMPT, &rq->fence.flags); 1355 i915_request_put(rq); 1356 1357 /* Followed by a maximum priority barrier (heartbeat) */ 1358 1359 ce = intel_context_create(engine); 1360 if (IS_ERR(ce)) { 1361 err = PTR_ERR(rq); 1362 goto out_spin; 1363 } 1364 1365 rq = intel_context_create_request(ce); 1366 intel_context_put(ce); 1367 if (IS_ERR(rq)) { 1368 err = PTR_ERR(rq); 1369 goto out_spin; 1370 } 1371 1372 rq->sched.attr.priority = I915_PRIORITY_BARRIER; 1373 i915_request_get(rq); 1374 i915_request_add(rq); 1375 1376 /* 1377 * Wait until the barrier is in ELSP, and we know timeslicing 1378 * will have been activated. 1379 */ 1380 if (wait_for_submit(engine, rq, HZ / 2)) { 1381 i915_request_put(rq); 1382 err = -ETIME; 1383 goto out_spin; 1384 } 1385 1386 /* 1387 * Since the ELSP[0] request is unpreemptible, it should not 1388 * allow the maximum priority barrier through. Wait long 1389 * enough to see if it is timesliced in by mistake. 1390 */ 1391 if (i915_request_wait(rq, 0, timeslice_threshold(engine)) >= 0) { 1392 pr_err("%s: I915_PRIORITY_BARRIER request completed, bypassing no-preempt request\n", 1393 engine->name); 1394 err = -EINVAL; 1395 } 1396 i915_request_put(rq); 1397 1398 out_spin: 1399 igt_spinner_end(&spin); 1400 out_heartbeat: 1401 xchg(&engine->props.timeslice_duration_ms, timeslice); 1402 engine_heartbeat_enable(engine); 1403 if (err) 1404 break; 1405 1406 if (igt_flush_test(gt->i915)) { 1407 err = -EIO; 1408 break; 1409 } 1410 } 1411 1412 igt_spinner_fini(&spin); 1413 return err; 1414 } 1415 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org