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 D5AEFC46CD2 for ; Tue, 9 Jan 2024 17:28:12 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9F0AF10E0E4; Tue, 9 Jan 2024 17:28:12 +0000 (UTC) Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) by gabe.freedesktop.org (Postfix) with ESMTPS id 26A9B10E478 for ; Tue, 9 Jan 2024 17:28:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1704821292; x=1736357292; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=FKecT5P54PdmBPC36Y2raHfhLXwBJg5CIstqWJ9/1Ik=; b=JO6T7a+RHMGY52JZsByZLqC1WMS3dX6m3H9p1ulossWiXnKQPLCEdtf0 CTYCCoR0TPNzIHWj6c8/x99OcHbCWcnRBkVO2rmSXeJYzIzVc/AzYNFgw jYZ8a7Y6JNF8as4SXruNEOGeAsy1a/Mz2ahWdTVySa/WSIuIQEJLiF5e7 x9zB/i7/pL9dTqvRClmEtsqB/b38hpXoHbyfrZKMUEA358rPHJT+u9akB o0hMs8k+GFyzFavc//sPCgK+gbFgz9z1R+SVVj9y6J5/vJRAByPO8L13R tmJJ1ihYSh+Jjt9WdiL2ln6kttsax4WRA1llonFvL4/AdDGByDzM2aYYk A==; X-IronPort-AV: E=McAfee;i="6600,9927,10947"; a="5624826" X-IronPort-AV: E=Sophos;i="6.04,183,1695711600"; d="scan'208";a="5624826" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Jan 2024 09:28:10 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.04,183,1695711600"; d="scan'208";a="16355302" Received: from lstrano-desk.jf.intel.com ([10.54.39.91]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Jan 2024 09:28:11 -0800 From: Matthew Brost To: Subject: [PATCH 1/4] drm/xe: Add build on bug to assert page fault queue works Date: Tue, 9 Jan 2024 09:28:35 -0800 Message-Id: <20240109172838.1376015-2-matthew.brost@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240109172838.1376015-1-matthew.brost@intel.com> References: <20240109172838.1376015-1-matthew.brost@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Lucas De Marchi Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" If NUM_PF_QUEUE % PF_MSG_LEN_DW != 0 then the page fault queue logic does not work when wrapping occurs. Add a build bug on to assert NUM_PF_QUEUE % PF_MSG_LEN_DW == 0 to enforce this restriction and document the code. Cc: Lucas De Marchi Signed-off-by: Matthew Brost --- drivers/gpu/drm/xe/xe_gt_pagefault.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/xe/xe_gt_pagefault.c b/drivers/gpu/drm/xe/xe_gt_pagefault.c index 4489aadc7a52..16cea47d9e15 100644 --- a/drivers/gpu/drm/xe/xe_gt_pagefault.c +++ b/drivers/gpu/drm/xe/xe_gt_pagefault.c @@ -328,6 +328,11 @@ int xe_guc_pagefault_handler(struct xe_guc *guc, u32 *msg, u32 len) u32 asid; bool full; + /* + * The below logic doesn't work unless NUM_PF_QUEUE % PF_MSG_LEN_DW == 0 + */ + BUILD_BUG_ON(NUM_PF_QUEUE % PF_MSG_LEN_DW); + if (unlikely(len != PF_MSG_LEN_DW)) return -EPROTO; -- 2.34.1