From patchwork Thu Jun 23 00:32:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vinay Belgaumkar X-Patchwork-Id: 12891598 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 8DA4BC43334 for ; Thu, 23 Jun 2022 00:33:56 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2405D8870A; Thu, 23 Jun 2022 00:33:50 +0000 (UTC) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9C4B910F6D2; Thu, 23 Jun 2022 00:33:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1655944428; x=1687480428; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=DHU6HSW0ZHwdNwVH21sXp1TNLittW/XutpAT/YGKw6E=; b=iMWnxJc4K6+Tj1hrJDvCzY3+m9eU/6VCic7jW6FSkml/+yDqkSJyKWUo Xqet2ZqeVjg1ujIxibyc7qHZFz8GU19HBfVj8cvjrmEp/7hdE1d3ygppw 1SeD7OpR7SOPs302P2SBtIvbd3RwQ6CqxbFYNrMMK7nOa672TamrGyzK4 sMOdcz339OuIr1cOTHiPJZa62BYjaP+Ji3giRJMCXBX5k3twSBf9kd4Px SWwoPLdEBnHNfMkb7Sbde1qILxvopxlDmUgxkCZpTUQdPpJEL+cKhRulo pl+1NQr0CVV4/iC6EIGfoxXdQZMGRLib+a59+ONI+2dzeyySIJ2eSujNb w==; X-IronPort-AV: E=McAfee;i="6400,9594,10386"; a="366904945" X-IronPort-AV: E=Sophos;i="5.92,215,1650956400"; d="scan'208";a="366904945" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jun 2022 17:33:48 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.92,215,1650956400"; d="scan'208";a="715626338" Received: from vbelgaum-ubuntu.fm.intel.com ([10.1.27.27]) by orsmga004.jf.intel.com with ESMTP; 22 Jun 2022 17:33:46 -0700 From: Vinay Belgaumkar To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH] drm/i915/guc/slpc: Use non-blocking H2G for waitboost Date: Wed, 22 Jun 2022 17:32:25 -0700 Message-Id: <20220623003225.23301-1-vinay.belgaumkar@intel.com> X-Mailer: git-send-email 2.35.1 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: Ashutosh Dixit , Vinay Belgaumkar Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" SLPC min/max frequency updates require H2G calls. We are seeing timeouts when GuC channel is backed up and it is unable to respond in a timely fashion causing warnings and affecting CI. This is seen when waitboosting happens during a stress test. this patch updates the waitboost path to use a non-blocking H2G call instead, which returns as soon as the message is successfully transmitted. v2: Use drm_notice to report any errors that might occur while sending the waitboost H2G request (Tvrtko) v3: Add drm_notice inside force_min_freq (Ashutosh) Cc: Ashutosh Dixit Signed-off-by: Vinay Belgaumkar Reviewed-by: Ashutosh Dixit --- drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c | 42 +++++++++++++++++---- 1 file changed, 35 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c index 2df31af70d63..ec9c4ca0f615 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_slpc.c @@ -98,6 +98,30 @@ static u32 slpc_get_state(struct intel_guc_slpc *slpc) return data->header.global_state; } +static int guc_action_slpc_set_param_nb(struct intel_guc *guc, u8 id, u32 value) +{ + u32 request[] = { + GUC_ACTION_HOST2GUC_PC_SLPC_REQUEST, + SLPC_EVENT(SLPC_EVENT_PARAMETER_SET, 2), + id, + value, + }; + int ret; + + ret = intel_guc_send_nb(guc, request, ARRAY_SIZE(request), 0); + + return ret > 0 ? -EPROTO : ret; +} + +static int slpc_set_param_nb(struct intel_guc_slpc *slpc, u8 id, u32 value) +{ + struct intel_guc *guc = slpc_to_guc(slpc); + + GEM_BUG_ON(id >= SLPC_MAX_PARAM); + + return guc_action_slpc_set_param_nb(guc, id, value); +} + static int guc_action_slpc_set_param(struct intel_guc *guc, u8 id, u32 value) { u32 request[] = { @@ -208,12 +232,14 @@ static int slpc_force_min_freq(struct intel_guc_slpc *slpc, u32 freq) */ with_intel_runtime_pm(&i915->runtime_pm, wakeref) { - ret = slpc_set_param(slpc, - SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ, - freq); + /* Non-blocking request will avoid stalls */ + ret = slpc_set_param_nb(slpc, + SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ, + freq); if (ret) - i915_probe_error(i915, "Unable to force min freq to %u: %d", - freq, ret); + drm_notice(&i915->drm, + "Failed to send set_param for min freq(%d): (%d)\n", + freq, ret); } return ret; @@ -222,6 +248,7 @@ static int slpc_force_min_freq(struct intel_guc_slpc *slpc, u32 freq) static void slpc_boost_work(struct work_struct *work) { struct intel_guc_slpc *slpc = container_of(work, typeof(*slpc), boost_work); + int err; /* * Raise min freq to boost. It's possible that @@ -231,8 +258,9 @@ static void slpc_boost_work(struct work_struct *work) */ mutex_lock(&slpc->lock); if (atomic_read(&slpc->num_waiters)) { - slpc_force_min_freq(slpc, slpc->boost_freq); - slpc->num_boosts++; + err = slpc_force_min_freq(slpc, slpc->boost_freq); + if (!err) + slpc->num_boosts++; } mutex_unlock(&slpc->lock); }