From patchwork Thu Jul 11 05:12:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nitin Gote X-Patchwork-Id: 13729991 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 5BF37C3DA41 for ; Thu, 11 Jul 2024 04:55:52 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CDE1B10E2C3; Thu, 11 Jul 2024 04:55:49 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="RwvRIeou"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.11]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5BFE410E2C3; Thu, 11 Jul 2024 04:55:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1720673748; x=1752209748; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=/0lBTOC+XozR7hq6QbSIgtUpJiqj6LHeBDiAh2GLgD0=; b=RwvRIeouixoAL05IhZF6Z8Nrcj9U/OdyO2oIa8FGY+YILUsvF5uI6cqe 7fRP7mrvAwRtQazC6o93/d1C2trhoj24+c5ZmGCisY9PO1migY3k5ZKh6 aYyMibBfacRmkWS3L6RKOocoFJjAb+UgemwwX8o9zxRVg7Z0xY3nrtPAq Zh0C2wXhKuCBsCIhM85IofMrvh00xm3k2j3S43TCsI//zWf/CFYJWYNuc YvqXCZEFYIAe4L6OU3iehkvv+H3JBuCBBzzbjbcuzTSVjQFXILoFvWV1n LxAdjWQ0cWDu7vUZkeDrm8bCnZ2EklcRHamkjk8RmWNDrNGvigRo2PhdG A==; X-CSE-ConnectionGUID: vsIfs+qHTeSPn8UrxO+4JQ== X-CSE-MsgGUID: 7GbHgFbiQJiQnYI5yJ+pxw== X-IronPort-AV: E=McAfee;i="6700,10204,11129"; a="28625532" X-IronPort-AV: E=Sophos;i="6.09,199,1716274800"; d="scan'208";a="28625532" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by orvoesa103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Jul 2024 21:55:48 -0700 X-CSE-ConnectionGUID: vKSWl+xFSHKTRdYCfOKMQA== X-CSE-MsgGUID: vu2h8A4LQm6iYQb0PopQwg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,199,1716274800"; d="scan'208";a="48331962" Received: from nitin-super-server.iind.intel.com ([10.145.169.70]) by fmviesa007.fm.intel.com with ESMTP; 10 Jul 2024 21:55:45 -0700 From: Nitin Gote To: tursulin@ursulin.net, intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org, andi.shyti@intel.com, chris.p.wilson@linux.intel.com, nirmoy.das@intel.com, janusz.krzysztofik@linux.intel.com, nitin.r.gote@intel.com, stable@vger.kernel.org Subject: [PATCH] drm/i915/gt: Do not consider preemption during execlists_dequeue for gen8 Date: Thu, 11 Jul 2024 10:42:15 +0530 Message-Id: <20240711051215.1143127-1-nitin.r.gote@intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" We're seeing a GPU HANG issue on a CHV platform, which was caused by bac24f59f454 ("drm/i915/execlists: Enable coarse preemption boundaries for gen8"). Gen8 platform has only timeslice and doesn't support a preemption mechanism as engines do not have a preemption timer and doesn't send an irq if the preemption timeout expires. So, add a fix to not consider preemption during dequeuing for gen8 platforms. Also move can_preemt() above need_preempt() function to resolve implicit declaration of function ‘can_preempt' error and make can_preempt() function param as const to resolve error: passing argument 1 of ‘can_preempt’ discards ‘const’ qualifier from the pointer target type. v2: Simplify can_preemt() function (Tvrtko Ursulin) Fixes: bac24f59f454 ("drm/i915/execlists: Enable coarse preemption boundaries for gen8") Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/11396 Suggested-by: Andi Shyti Signed-off-by: Nitin Gote Cc: Chris Wilson CC: # v5.2+ --- .../drm/i915/gt/intel_execlists_submission.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c index 21829439e686..59885d7721e4 100644 --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c @@ -294,11 +294,19 @@ static int virtual_prio(const struct intel_engine_execlists *el) return rb ? rb_entry(rb, struct ve_node, rb)->prio : INT_MIN; } +static bool can_preempt(const struct intel_engine_cs *engine) +{ + return GRAPHICS_VER(engine->i915) > 8; +} + static bool need_preempt(const struct intel_engine_cs *engine, const struct i915_request *rq) { int last_prio; + if (!can_preempt(engine)) + return false; + if (!intel_engine_has_semaphores(engine)) return false; @@ -3313,15 +3321,6 @@ static void remove_from_engine(struct i915_request *rq) i915_request_notify_execute_cb_imm(rq); } -static bool can_preempt(struct intel_engine_cs *engine) -{ - if (GRAPHICS_VER(engine->i915) > 8) - return true; - - /* GPGPU on bdw requires extra w/a; not implemented */ - return engine->class != RENDER_CLASS; -} - static void kick_execlists(const struct i915_request *rq, int prio) { struct intel_engine_cs *engine = rq->engine;