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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5BBF8C77B7D for ; Mon, 15 May 2023 17:25:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244240AbjEORZi (ORCPT ); Mon, 15 May 2023 13:25:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40962 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244074AbjEORZX (ORCPT ); Mon, 15 May 2023 13:25:23 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9240D12E98 for ; Mon, 15 May 2023 10:24:12 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 1385062CB9 for ; Mon, 15 May 2023 17:24:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 05C18C433EF; Mon, 15 May 2023 17:24:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684171451; bh=JFEmUAFbvR1GozaB9PYdzBfxPtxuIWcR5UcXntMwvrk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uJ3OVHFLWya1E2izS2JPyuaZ2Cm++TvLfnxdrt9YH0b76l0NSGpej4LFU0QwPOYPR kQbCQS3vpHErjJcDmPHZqVQyHDlEe6VMQZMhlUT9/DOFrfYGRprspngXrupxC0uvBE q5WnZQBF+Mpc7iS20Thjxuy6mpxdNDGyvLhbChjM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ross Zwisler , =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= , Jani Nikula , Joonas Lahtinen , Sasha Levin Subject: [PATCH 6.2 214/242] drm/i915: Check pipe source size when using skl+ scalers Date: Mon, 15 May 2023 18:29:00 +0200 Message-Id: <20230515161728.348164855@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230515161721.802179972@linuxfoundation.org> References: <20230515161721.802179972@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ville Syrjälä [ Upstream commit d944eafed618a8507270b324ad9d5405bb7f0b3e ] The skl+ scalers only sample 12 bits of PIPESRC so we can't do any plane scaling at all when the pipe source size is >4k. Make sure the pipe source size is also below the scaler's src size limits. Might not be 100% accurate, but should at least be safe. We can refine the limits later if we discover that recent hw is less restricted. Cc: stable@vger.kernel.org Tested-by: Ross Zwisler Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8357 Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20230418175528.13117-2-ville.syrjala@linux.intel.com Reviewed-by: Jani Nikula (cherry picked from commit 691248d4135fe3fae64b4ee0676bc96a7fd6950c) Signed-off-by: Joonas Lahtinen Signed-off-by: Sasha Levin --- drivers/gpu/drm/i915/display/skl_scaler.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/gpu/drm/i915/display/skl_scaler.c b/drivers/gpu/drm/i915/display/skl_scaler.c index 01e8812936126..fe5c47672580b 100644 --- a/drivers/gpu/drm/i915/display/skl_scaler.c +++ b/drivers/gpu/drm/i915/display/skl_scaler.c @@ -107,6 +107,8 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach, struct drm_i915_private *dev_priv = to_i915(crtc->base.dev); const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode; + int pipe_src_w = drm_rect_width(&crtc_state->pipe_src); + int pipe_src_h = drm_rect_height(&crtc_state->pipe_src); int min_src_w, min_src_h, min_dst_w, min_dst_h; int max_src_w, max_src_h, max_dst_w, max_dst_h; @@ -198,6 +200,21 @@ skl_update_scaler(struct intel_crtc_state *crtc_state, bool force_detach, return -EINVAL; } + /* + * The pipe scaler does not use all the bits of PIPESRC, at least + * on the earlier platforms. So even when we're scaling a plane + * the *pipe* source size must not be too large. For simplicity + * we assume the limits match the scaler source size limits. Might + * not be 100% accurate on all platforms, but good enough for now. + */ + if (pipe_src_w > max_src_w || pipe_src_h > max_src_h) { + drm_dbg_kms(&dev_priv->drm, + "scaler_user index %u.%u: pipe src size %ux%u " + "is out of scaler range\n", + crtc->pipe, scaler_user, pipe_src_w, pipe_src_h); + return -EINVAL; + } + /* mark this plane as a scaler user in crtc_state */ scaler_state->scaler_users |= (1 << scaler_user); drm_dbg_kms(&dev_priv->drm, "scaler_user index %u.%u: " -- 2.39.2