From patchwork Fri Jan 27 00:28:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Harrison X-Patchwork-Id: 13118010 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 6A283C54EAA for ; Fri, 27 Jan 2023 00:29:03 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 54F9210E157; Fri, 27 Jan 2023 00:29:02 +0000 (UTC) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id BE95E10E146; Fri, 27 Jan 2023 00:28:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1674779339; x=1706315339; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bvBPqBJzrPZsz1udXkh/HMQaaXs7fmZnunh55oxpb5k=; b=TR9HpstX3OUeCWxztdz+5aXkQIPFmj1JULTILWEqvw/Lzl+FS2sRA9l6 +M56yeKw9SMaQXB9+L7vfqFeQCQHwtPpdui1RBnT+NpjOEOVWE4rGY1nO gPVk/L4bxbvpN7zFwm0CZOSTF3apS9/fek7taeMKehT/oMJAtlPYJ6u3L XOfJYYri23lEGYd31S9ezOEkF/XpFTuwYzVDuC7OZbfq1GZwaiX0tBWih lokupyvaKk2ibQ/+1a7OOjG1G6StMOzuHAYFEDg0Vw9QoF04KuHd8IhDj 2RV/IGPrYVeK6EiFm1F5+T1U7qZTpeIwJiZy3f18JDOju0FwNSAtWi27+ A==; X-IronPort-AV: E=McAfee;i="6500,9779,10602"; a="324687298" X-IronPort-AV: E=Sophos;i="5.97,249,1669104000"; d="scan'208";a="324687298" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Jan 2023 16:28:50 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10602"; a="805621884" X-IronPort-AV: E=Sophos;i="5.97,249,1669104000"; d="scan'208";a="805621884" Received: from relo-linux-5.jf.intel.com ([10.165.21.152]) by fmsmga001.fm.intel.com with ESMTP; 26 Jan 2023 16:28:50 -0800 From: John.C.Harrison@Intel.com To: Intel-GFX@Lists.FreeDesktop.Org Subject: [PATCH v6 1/8] drm/i915/guc: Fix locking when searching for a hung request Date: Thu, 26 Jan 2023 16:28:35 -0800 Message-Id: <20230127002842.3169194-2-John.C.Harrison@Intel.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230127002842.3169194-1-John.C.Harrison@Intel.com> References: <20230127002842.3169194-1-John.C.Harrison@Intel.com> MIME-Version: 1.0 Organization: Intel Corporation (UK) Ltd. - Co. Reg. #1134945 - Pipers Way, Swindon SN3 1RJ 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: Matthew Brost , Chris Wilson , Michael Cheng , Alan Previn , Tvrtko Ursulin , Umesh Nerlige Ramappa , Matthew Auld , Lucas De Marchi , Daniele Ceraolo Spurio , DRI-Devel@Lists.FreeDesktop.Org, Rodrigo Vivi , Tejas Upadhyay , John Harrison , Bruce Chang Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: John Harrison intel_guc_find_hung_context() was not acquiring the correct spinlock before searching the request list. So fix that up. While at it, add some extra whitespace padding for readability. Fixes: dc0dad365c5e ("drm/i915/guc: Fix for error capture after full GPU reset with GuC") Signed-off-by: John Harrison Reviewed-by: Daniele Ceraolo Spurio Acked-by: Tvrtko Ursulin Cc: Matthew Brost Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Rodrigo Vivi Cc: Matt Roper Cc: Umesh Nerlige Ramappa Cc: Michael Cheng Cc: Lucas De Marchi Cc: Tejas Upadhyay Cc: Chris Wilson Cc: Bruce Chang Cc: Alan Previn Cc: Matthew Auld --- drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c index b436dd7f12e42..3b34a82d692be 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -4820,6 +4820,8 @@ void intel_guc_find_hung_context(struct intel_engine_cs *engine) xa_lock_irqsave(&guc->context_lookup, flags); xa_for_each(&guc->context_lookup, index, ce) { + bool found; + if (!kref_get_unless_zero(&ce->ref)) continue; @@ -4836,10 +4838,18 @@ void intel_guc_find_hung_context(struct intel_engine_cs *engine) goto next; } + found = false; + spin_lock(&ce->guc_state.lock); list_for_each_entry(rq, &ce->guc_state.requests, sched.link) { if (i915_test_request_state(rq) != I915_REQUEST_ACTIVE) continue; + found = true; + break; + } + spin_unlock(&ce->guc_state.lock); + + if (found) { intel_engine_set_hung_context(engine, ce); /* Can only cope with one hang at a time... */ @@ -4847,6 +4857,7 @@ void intel_guc_find_hung_context(struct intel_engine_cs *engine) xa_lock(&guc->context_lookup); goto done; } + next: intel_context_put(ce); xa_lock(&guc->context_lookup);