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 C507AC48BC4 for ; Tue, 20 Feb 2024 11:21:58 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 21D5010E03E; Tue, 20 Feb 2024 11:21:58 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="hckMj7mp"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9350B10E03E; Tue, 20 Feb 2024 11:21:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1708428118; x=1739964118; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=t+iADnVDhVJYx2pC41LWdZL2wjAkD6oDaluEgktlvb0=; b=hckMj7mp/pPfsAXyAfkyDf5m8GzqFKJSC6RjQRcI/aH+a+B14jaUvQxo PQmrrjiR0R8Cq8WGuyLicRCETae80jIyGZmn58OnSMTeybDAEgtBEZF05 2OCR+gi+TK6u/qej2nlhw/h14THSEzbt1OjreF6ChHCylIkDpeK6uY5Rf HBo3euhi4topC2n6XvOe4452T5d3ynPxP8k5CkcxgHu+4St7jvFrtFv9o NM1SN+X1FZuTpnJIfQkas2zckkgc43fTy/XDNqyZSpZAThAxxwuqXhjgW jXR6L/LoreiS6c8E9F9/7Qyw3W/z3f3UFxe4uTvTak02DJGmowSn4+qKV A==; X-IronPort-AV: E=McAfee;i="6600,9927,10989"; a="13232964" X-IronPort-AV: E=Sophos;i="6.06,172,1705392000"; d="scan'208";a="13232964" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Feb 2024 03:21:57 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,172,1705392000"; d="scan'208";a="4715832" Received: from alichtma-mobl.ger.corp.intel.com (HELO intel.com) ([10.246.34.74]) by orviesa009-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Feb 2024 03:21:54 -0800 Date: Tue, 20 Feb 2024 12:21:51 +0100 From: Andi Shyti To: Tvrtko Ursulin Cc: Andi Shyti , intel-gfx , dri-devel , Chris Wilson , Joonas Lahtinen , Matt Roper , stable@vger.kernel.org, Andi Shyti Subject: Re: [PATCH 2/2] drm/i915/gt: Set default CCS mode '1' Message-ID: References: <20240215135924.51705-1-andi.shyti@linux.intel.com> <20240215135924.51705-3-andi.shyti@linux.intel.com> <97b11121-4c48-4dd9-b966-4c42eda3f6a3@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <97b11121-4c48-4dd9-b966-4c42eda3f6a3@linux.intel.com> 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" On Tue, Feb 20, 2024 at 11:15:05AM +0000, Tvrtko Ursulin wrote: > On 20/02/2024 10:11, Andi Shyti wrote: > > On Mon, Feb 19, 2024 at 12:51:44PM +0000, Tvrtko Ursulin wrote: > > > On 19/02/2024 11:16, Tvrtko Ursulin wrote: > > > > On 15/02/2024 13:59, Andi Shyti wrote: > > > > ... > > > > > > > +/* > > > > > + * Exclude unavailable engines. > > > > > + * > > > > > + * Only the first CCS engine is utilized due to the disabling of > > > > > CCS auto load > > > > > + * balancing. As a result, all CCS engines operate collectively, > > > > > functioning > > > > > + * essentially as a single CCS engine, hence the count of active > > > > > CCS engines is > > > > > + * considered '1'. > > > > > + * Currently, this applies to platforms with more than one CCS engine, > > > > > + * specifically DG2. > > > > > + */ > > > > > +#define for_each_available_uabi_engine(engine__, i915__) \ > > > > > +    for_each_uabi_engine(engine__, i915__) \ > > > > > +        if ((IS_DG2(i915__)) && \ > > > > > +            ((engine__)->uabi_class == I915_ENGINE_CLASS_COMPUTE) && \ > > > > > +            ((engine__)->uabi_instance)) { } \ > > > > > +        else > > > > > + > > > > > > > > If you don't want userspace to see some engines, just don't add them to > > > > the uabi list in intel_engines_driver_register or thereabouts? > > > > It will be dynamic. In next series I am preparing the user will > > be able to increase the number of CCS engines he wants to use. > > Oh tricky and new. Does it need to be at runtime or could be boot time? At boot time the CCS mode has to be set to '1', i.e. only one CCS will be visible to the user. Then, during the normal execution of the driver, the user can decide to change the mode and therefore we would need to expose more than one CCS engine. > If you are aiming to make the static single CCS only into the 6.9 release, > and you feel running out of time, you could always do a simple solution for > now. The one I mentioned of simply not registering on the uabi list. Then > you can refine more leisurely for the next release. Thanks. I started working on a dynamic rebuilt of the uabi_engines, but in this series it wouldn't fit. I will add the limitation during the list creation. Thanks a lot, Andi