From patchwork Sat Dec 11 17:35:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Brost X-Patchwork-Id: 12671879 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 93ABBC433F5 for ; Sat, 11 Dec 2021 17:41:41 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 90CC310E6AB; Sat, 11 Dec 2021 17:41:17 +0000 (UTC) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1357910E330; Sat, 11 Dec 2021 17:41:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1639244475; x=1670780475; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=QL7FferO/vmcvzY+uqMKOIStr97w9GvFQG07TpucjoU=; b=mknKjHNb52b3NtUtFGzhWmEl8n3LXoeZv4bo1+Ccpa5UZYhP9WgcjsfI TcQAwLtJNQeNKpmPYnD9N3xqJ/vY12ZEqsncoOhCFIK9sL/rZSHRRnsBA oRKg0tbGlcqywDbr08GwO/ybMx4WhkiJ/s/bbRc2t0UktVS5f9U+nJDe5 eGx7ECnFh5M5WaTpQT7s/pAfYogKreYFT4eHOOHh7EoD/4S4JTFCn9Tbt yrpgMB3ZJckoO1RKT+7BM12rSmrHCsfhq65XbTEA/ZdeoGbKlAwCn2K5r E66KE36L15SNr80haUtIzIdRNjyW98GYzxLTZwcw18K8BmuKwAUplYHhg g==; X-IronPort-AV: E=McAfee;i="6200,9189,10195"; a="238493213" X-IronPort-AV: E=Sophos;i="5.88,198,1635231600"; d="scan'208";a="238493213" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Dec 2021 09:41:14 -0800 X-IronPort-AV: E=Sophos;i="5.88,198,1635231600"; d="scan'208";a="602548117" Received: from jons-linux-dev-box.fm.intel.com ([10.1.27.20]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Dec 2021 09:41:13 -0800 From: Matthew Brost To: , Subject: [PATCH 6/7] drm/i915/guc: Kick G2H tasklet if no credits Date: Sat, 11 Dec 2021 09:35:44 -0800 Message-Id: <20211211173545.23536-7-matthew.brost@intel.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211211173545.23536-1-matthew.brost@intel.com> References: <20211211173545.23536-1-matthew.brost@intel.com> MIME-Version: 1.0 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: daniele.ceraolospurio@intel.com, john.c.harrison@intel.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Let's be paranoid and kick the G2H tasklet, which dequeues messages, if G2H credits are exhausted. Signed-off-by: Matthew Brost Reviewed-by: John Harrison --- drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c index 741be9abab68..aa6dd6415202 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c @@ -591,12 +591,19 @@ static inline bool h2g_has_room(struct intel_guc_ct *ct, u32 len_dw) static int has_room_nb(struct intel_guc_ct *ct, u32 h2g_dw, u32 g2h_dw) { + bool h2g = h2g_has_room(ct, h2g_dw); + bool g2h = g2h_has_room(ct, g2h_dw); + lockdep_assert_held(&ct->ctbs.send.lock); - if (unlikely(!h2g_has_room(ct, h2g_dw) || !g2h_has_room(ct, g2h_dw))) { + if (unlikely(!h2g || !g2h)) { if (ct->stall_time == KTIME_MAX) ct->stall_time = ktime_get(); + /* Be paranoid and kick G2H tasklet to free credits */ + if (!g2h) + tasklet_hi_schedule(&ct->receive_tasklet); + if (unlikely(ct_deadlocked(ct))) return -EPIPE; else