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 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 E31D0C61DBD for ; Tue, 25 Aug 2026 16:58:31 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7357910EAF1; Tue, 25 Aug 2026 16:58:31 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="ZtOQGC+j"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.18]) by gabe.freedesktop.org (Postfix) with ESMTPS id 214F610EAF1; Tue, 25 Aug 2026 16:58:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1787677110; x=1819213110; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=FOg1L5wFGlo/u2Epu58SyFd88mygrvBWFptaUJ7Xmr0=; b=ZtOQGC+jBWoqc/ngewwnSwR2t9y1TF38Gr1rr6xWUhLW0t/z5MsqH9X+ xG2f4qlb0GleiOnuJLmlpZQ0w7RnguESTX75OZSjxOEGxarRCP9hGlgXb Y8sVd/HokDdylOQqZqWXfTOALwCgj11MmgHr/Apyv/XBvvcMwyuDMlYZ6 j1v6wdetSjFCHj5j1Kjnh7AaZljytm+h6snzCwuCfD0/E2HiuXG52TOge C0tdg1N/i+OSEtbX0fmt6IpN8MDf9uY8E4vzhm+pJXLiz2ZON3Zk4nnyj Me7Wi4aBMPfy/lgCy6h1N1YM6muBQlK/dw8wR40QDjUgXuiFwuIGcblGa Q==; X-CSE-ConnectionGUID: DpdWBgOGT2af8uX9Jbe6Bg== X-CSE-MsgGUID: WJcTFLbZQoSvwIXV3LSH3A== X-IronPort-AV: E=McAfee;i="6800,10657,11886"; a="88206789" X-IronPort-AV: E=Sophos;i="6.25,243,1779174000"; d="scan'208";a="88206789" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by orvoesa110.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2026 09:58:30 -0700 X-CSE-ConnectionGUID: lhASWLSKStyR0YKooIyC0g== X-CSE-MsgGUID: e67qKIxxQIWlA2TOnMtgmA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,243,1779174000"; d="scan'208";a="270819798" Received: from chu13-desk.fm.intel.com ([10.80.209.189]) by ORVIESA003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2026 09:58:29 -0700 From: Austin Hu To: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org Cc: ville.syrjala@linux.intel.com, maarten.lankhorst@linux.intel.com, vinod.govindapillai@intel.com Subject: [PATCH v2 1/2] drm/i915/fbc: fbc_dirty_rect restrictions and logging Date: Tue, 25 Aug 2026 09:56:28 -0700 Message-Id: <20260825165629.1799744-2-austin.hu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260812215350.3753102-1-austin.hu@intel.com> References: <20260812215350.3753102-1-austin.hu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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" From: Charlton Lin Clamp the FBC dirty rectangle coordinates to the valid frame buffer range [y_offset, y_end] to prevent out-of-bounds coordinates, and log a debug message when clamping occurs. Signed-off-by: Charlton Lin Signed-off-by: Austin Hu --- drivers/gpu/drm/i915/display/intel_fbc.c | 39 ++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c index f61b4a218d6e..c0fed695af0d 100644 --- a/drivers/gpu/drm/i915/display/intel_fbc.c +++ b/drivers/gpu/drm/i915/display/intel_fbc.c @@ -1521,11 +1521,14 @@ __intel_fbc_prepare_dirty_rect(const struct intel_plane_state *plane_state, const struct intel_crtc_state *crtc_state) { struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane); + struct intel_display *display = to_intel_display(plane_state); struct intel_fbc *fbc = plane->fbc; struct drm_rect *fbc_dirty_rect = &fbc->state.dirty_rect; int width = drm_rect_width(&plane_state->uapi.src) >> 16; + int height = drm_rect_height(&plane_state->uapi.src) >> 16; const struct drm_rect *damage = &plane_state->damage; int y_offset = plane_state->view.color_plane[0].y; + int y_end = y_offset + height; lockdep_assert_held(&fbc->lock); @@ -1535,11 +1538,41 @@ __intel_fbc_prepare_dirty_rect(const struct intel_plane_state *plane_state, return; } - if (drm_rect_visible(damage)) - *fbc_dirty_rect = *damage; - else + if (drm_rect_visible(damage)) { + int y1, y2; + + if (plane_state->hw.rotation & DRM_MODE_ROTATE_180) { + /* Under 180 degree rotation, coordinate system is inverted */ + int inv_y1 = height - damage->y2; + int inv_y2 = height - damage->y1; + + y1 = clamp(y_offset + inv_y1, y_offset, y_end); + y2 = clamp(y_offset + inv_y2, y_offset, y_end); + } else { + y1 = clamp(damage->y1, y_offset, y_end); + y2 = clamp(damage->y2, y_offset, y_end); + } + + /* + * Clamp dirty rect to the valid FB range [y_offset, y_end]. + * Per Bspec: + * start_line >= y_offset + * end_line <= y_offset + plane_height + */ + if (y1 != damage->y1 || y2 != damage->y2) + drm_dbg_kms(display->drm, + "[PLANE:%d:%s] FBC dirty rect out of range: y1=%d y2=%d clamped to y1=%d y2=%d (y_offset=%d y_end=%d)\n", + plane->base.base.id, plane->base.name, + damage->y1, damage->y2, y1, y2, y_offset, y_end); + + fbc_dirty_rect->x1 = damage->x1; + fbc_dirty_rect->x2 = damage->x2; + fbc_dirty_rect->y1 = y1; + fbc_dirty_rect->y2 = y2; + } else { /* dirty rect must cover at least one line */ *fbc_dirty_rect = DRM_RECT_INIT(0, y_offset, width, 1); + } } void -- 2.34.1