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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB14BC433EF for ; Mon, 18 Oct 2021 09:42:19 +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 88F4D61027 for ; Mon, 18 Oct 2021 09:42:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 88F4D61027 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A00176E9C7; Mon, 18 Oct 2021 09:42:18 +0000 (UTC) Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by gabe.freedesktop.org (Postfix) with ESMTPS id 13C496E9C6 for ; Mon, 18 Oct 2021 09:42:17 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10140"; a="208315985" X-IronPort-AV: E=Sophos;i="5.85,381,1624345200"; d="scan'208";a="208315985" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Oct 2021 02:42:12 -0700 X-IronPort-AV: E=Sophos;i="5.85,381,1624345200"; d="scan'208";a="493516768" Received: from ideak-desk.fi.intel.com ([10.237.68.141]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Oct 2021 02:42:06 -0700 From: Imre Deak To: intel-gfx@lists.freedesktop.org Cc: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Mon, 18 Oct 2021 12:41:54 +0300 Message-Id: <20211018094154.1407705-7-imre.deak@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20211018094154.1407705-1-imre.deak@intel.com> References: <20211018094154.1407705-1-imre.deak@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Intel-gfx] [PATCH 6/6] drm/i915/dp: Sanitize link common rate array lookups 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" Add an assert that lookups from the intel_dp->common_rates[] array are always valid. Cc: Ville Syrjälä Signed-off-by: Imre Deak --- drivers/gpu/drm/i915/display/intel_dp.c | 33 ++++++++++++------------- 1 file changed, 16 insertions(+), 17 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index f8082eb8e7263..3869d454c10f0 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -267,10 +267,19 @@ static int intel_dp_common_len_rate_limit(const struct intel_dp *intel_dp, intel_dp->num_common_rates, max_rate); } +static int intel_dp_common_rate(struct intel_dp *intel_dp, int index) +{ + if (drm_WARN_ON(&dp_to_i915(intel_dp)->drm, + index < 0 || index >= intel_dp->num_common_rates)) + return 162000; + + return intel_dp->common_rates[index]; +} + /* Theoretical max between source and sink */ static int intel_dp_max_common_rate(struct intel_dp *intel_dp) { - return intel_dp->common_rates[intel_dp->num_common_rates - 1]; + return intel_dp_common_rate(intel_dp, intel_dp->num_common_rates - 1); } /* Theoretical max between source and sink */ @@ -610,13 +619,13 @@ int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, if (index > 0) { if (intel_dp_is_edp(intel_dp) && !intel_dp_can_link_train_fallback_for_edp(intel_dp, - intel_dp->common_rates[index - 1], + intel_dp_common_rate(intel_dp, index - 1), lane_count)) { drm_dbg_kms(&i915->drm, "Retrying Link training for eDP with same parameters\n"); return 0; } - intel_dp->max_link_rate = intel_dp->common_rates[index - 1]; + intel_dp->max_link_rate = intel_dp_common_rate(intel_dp, index - 1); intel_dp->max_link_lane_count = lane_count; } else if (lane_count > 1) { if (intel_dp_is_edp(intel_dp) && @@ -1056,14 +1065,11 @@ static void intel_dp_print_rates(struct intel_dp *intel_dp) int intel_dp_max_link_rate(struct intel_dp *intel_dp) { - struct drm_i915_private *i915 = dp_to_i915(intel_dp); int len; len = intel_dp_common_len_rate_limit(intel_dp, intel_dp->max_link_rate); - if (drm_WARN_ON(&i915->drm, len <= 0)) - return 162000; - return intel_dp->common_rates[len - 1]; + return intel_dp_common_rate(intel_dp, len - 1); } int intel_dp_rate_select(struct intel_dp *intel_dp, int rate) @@ -1260,7 +1266,7 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp, output_bpp); for (i = 0; i < intel_dp->num_common_rates; i++) { - link_rate = intel_dp->common_rates[i]; + link_rate = intel_dp_common_rate(intel_dp, i); if (link_rate < limits->min_rate || link_rate > limits->max_rate) continue; @@ -1508,17 +1514,10 @@ intel_dp_compute_link_config(struct intel_encoder *encoder, &pipe_config->hw.adjusted_mode; struct intel_dp *intel_dp = enc_to_intel_dp(encoder); struct link_config_limits limits; - int common_len; int ret; - common_len = intel_dp_common_len_rate_limit(intel_dp, - intel_dp->max_link_rate); - - /* No common link rates between source and sink */ - drm_WARN_ON(encoder->base.dev, common_len <= 0); - - limits.min_rate = intel_dp->common_rates[0]; - limits.max_rate = intel_dp->common_rates[common_len - 1]; + limits.min_rate = intel_dp_common_rate(intel_dp, 0); + limits.max_rate = intel_dp_max_link_rate(intel_dp); limits.min_lane_count = 1; limits.max_lane_count = intel_dp_max_lane_count(intel_dp); -- 2.27.0