From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 16858C4743D for ; Fri, 11 Jun 2021 06:08:56 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A942260FEE for ; Fri, 11 Jun 2021 06:08:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A942260FEE Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CC6596E52D; Fri, 11 Jun 2021 06:08:52 +0000 (UTC) Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by gabe.freedesktop.org (Postfix) with ESMTPS id DEDE96E520; Fri, 11 Jun 2021 06:08:50 +0000 (UTC) IronPort-SDR: mGvJjPc00O9htdNYe9awbSeOoxgq9bvygOYb+AThyvVt5ZEm5GAAPlscJOnqqpX3Gfes9ix5bd qrYt5D9SCFSA== X-IronPort-AV: E=McAfee;i="6200,9189,10011"; a="269317933" X-IronPort-AV: E=Sophos;i="5.83,265,1616482800"; d="scan'208";a="269317933" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Jun 2021 23:08:48 -0700 IronPort-SDR: YXAMYoVmnVO0xFrY4iVVJ6JLv/QsawTVEHmjbD4/audOgTyL9GXXzWDpA2KRop8NIG2Fk/uR1r /UfVq+XcfV2Q== X-IronPort-AV: E=Sophos;i="5.83,265,1616482800"; d="scan'208";a="449000311" Received: from skallurr-mobl.ger.corp.intel.com (HELO thellst-mobl1.intel.com) ([10.249.254.170]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Jun 2021 23:08:46 -0700 From: =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH] drm/i915/selftests: Reorder tasklet_disable vs local_bh_disable Date: Fri, 11 Jun 2021 08:08:38 +0200 Message-Id: <20210611060838.647973-1-thomas.hellstrom@linux.intel.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= , Chris Wilson Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Chris Wilson Due to a change in requirements that disallows tasklet_disable() being called from atomic context, rearrange the selftest to avoid doing so. <3> [324.942939] BUG: sleeping function called from invalid context at kernel/softirq.c:888 <3> [324.942952] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5601, name: i915_selftest <4> [324.942960] 1 lock held by i915_selftest/5601: <4> [324.942963] #0: ffff888101d19240 (&dev->mutex){....}-{3:3}, at: device_driver_attach+0x18/0x50 <3> [324.942987] Preemption disabled at: <3> [324.942990] [] live_hold_reset.part.65+0xc2/0x2f0 [i915] <4> [324.943255] CPU: 0 PID: 5601 Comm: i915_selftest Tainted: G U 5.13.0-rc5-CI-CI_DRM_10197+ #1 <4> [324.943259] Hardware name: Intel Corp. Geminilake/GLK RVP2 LP4SD (07), BIOS GELKRVPA.X64.0062.B30.1708222146 08/22/2017 <4> [324.943263] Call Trace: <4> [324.943267] dump_stack+0x7f/0xad <4> [324.943276] ___might_sleep.cold.123+0xf2/0x106 <4> [324.943286] tasklet_unlock_wait+0x2e/0xb0 <4> [324.943291] ? ktime_get_raw+0x81/0x120 <4> [324.943305] live_hold_reset.part.65+0x1ab/0x2f0 [i915] <4> [324.943500] __i915_subtests.cold.7+0x42/0x92 [i915] <4> [324.943723] ? __i915_live_teardown+0x50/0x50 [i915] <4> [324.943922] ? __intel_gt_live_setup+0x30/0x30 [i915] Fixes: da044747401fc ("tasklets: Replace spin wait in tasklet_unlock_wait()") Signed-off-by: Chris Wilson Reviewed-by: Thomas Hellström --- drivers/gpu/drm/i915/gt/selftest_execlists.c | 55 ++++++++++++-------- 1 file changed, 32 insertions(+), 23 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c b/drivers/gpu/drm/i915/gt/selftest_execlists.c index ea2203af0764..1c8108d30b85 100644 --- a/drivers/gpu/drm/i915/gt/selftest_execlists.c +++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c @@ -551,6 +551,32 @@ static int live_pin_rewind(void *arg) return err; } +static int engine_lock_reset_tasklet(struct intel_engine_cs *engine) +{ + tasklet_disable(&engine->execlists.tasklet); + local_bh_disable(); + + if (test_and_set_bit(I915_RESET_ENGINE + engine->id, + &engine->gt->reset.flags)) { + local_bh_enable(); + tasklet_enable(&engine->execlists.tasklet); + + intel_gt_set_wedged(engine->gt); + return -EBUSY; + } + + return 0; +} + +static void engine_unlock_reset_tasklet(struct intel_engine_cs *engine) +{ + clear_and_wake_up_bit(I915_RESET_ENGINE + engine->id, + &engine->gt->reset.flags); + + local_bh_enable(); + tasklet_enable(&engine->execlists.tasklet); +} + static int live_hold_reset(void *arg) { struct intel_gt *gt = arg; @@ -598,15 +624,9 @@ static int live_hold_reset(void *arg) /* We have our request executing, now remove it and reset */ - local_bh_disable(); - if (test_and_set_bit(I915_RESET_ENGINE + id, - >->reset.flags)) { - local_bh_enable(); - intel_gt_set_wedged(gt); - err = -EBUSY; + err = engine_lock_reset_tasklet(engine); + if (err) goto out; - } - tasklet_disable(&engine->execlists.tasklet); engine->execlists.tasklet.callback(&engine->execlists.tasklet); GEM_BUG_ON(execlists_active(&engine->execlists) != rq); @@ -618,10 +638,7 @@ static int live_hold_reset(void *arg) __intel_engine_reset_bh(engine, NULL); GEM_BUG_ON(rq->fence.error != -EIO); - tasklet_enable(&engine->execlists.tasklet); - clear_and_wake_up_bit(I915_RESET_ENGINE + id, - >->reset.flags); - local_bh_enable(); + engine_unlock_reset_tasklet(engine); /* Check that we do not resubmit the held request */ if (!i915_request_wait(rq, 0, HZ / 5)) { @@ -4585,15 +4602,9 @@ static int reset_virtual_engine(struct intel_gt *gt, GEM_BUG_ON(engine == ve->engine); /* Take ownership of the reset and tasklet */ - local_bh_disable(); - if (test_and_set_bit(I915_RESET_ENGINE + engine->id, - >->reset.flags)) { - local_bh_enable(); - intel_gt_set_wedged(gt); - err = -EBUSY; + err = engine_lock_reset_tasklet(engine); + if (err) goto out_heartbeat; - } - tasklet_disable(&engine->execlists.tasklet); engine->execlists.tasklet.callback(&engine->execlists.tasklet); GEM_BUG_ON(execlists_active(&engine->execlists) != rq); @@ -4612,9 +4623,7 @@ static int reset_virtual_engine(struct intel_gt *gt, GEM_BUG_ON(rq->fence.error != -EIO); /* Release our grasp on the engine, letting CS flow again */ - tasklet_enable(&engine->execlists.tasklet); - clear_and_wake_up_bit(I915_RESET_ENGINE + engine->id, >->reset.flags); - local_bh_enable(); + engine_unlock_reset_tasklet(engine); /* Check that we do not resubmit the held request */ i915_request_get(rq); -- 2.31.1