From patchwork Thu May 27 14:47:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Hellstrom X-Patchwork-Id: 12284499 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D5573C4707F for ; Thu, 27 May 2021 14:47:37 +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 997F960D07 for ; Thu, 27 May 2021 14:47:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 997F960D07 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 011BD6F3D1; Thu, 27 May 2021 14:47:34 +0000 (UTC) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9D8226F388; Thu, 27 May 2021 14:47:31 +0000 (UTC) IronPort-SDR: DQP2ITsQRk0vKGL4xKdmIZjCTE6FIUiAhUqoIX7n2SB8XIn9Dib/Ri5R4uin/go7GmdviP08t9 H89bDSw39MEw== X-IronPort-AV: E=McAfee;i="6200,9189,9996"; a="202515580" X-IronPort-AV: E=Sophos;i="5.82,334,1613462400"; d="scan'208";a="202515580" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 May 2021 07:47:31 -0700 IronPort-SDR: 1OkfnBlg1mBbt5VrYNCEziy13te3Tj3Cl1WKLL6fxBapR8k7JL3KfwBkg887L5DVeXmZQImZGg 3CH5J6Bc3ldQ== X-IronPort-AV: E=Sophos;i="5.82,334,1613462400"; d="scan'208";a="443597876" Received: from ibanaga-mobl.ger.corp.intel.com (HELO thellst-mobl1.intel.com) ([10.249.254.58]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 May 2021 07:47:29 -0700 From: =?utf-8?q?Thomas_Hellstr=C3=B6m?= To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Date: Thu, 27 May 2021 16:47:00 +0200 Message-Id: <20210527144710.1975553-6-thomas.hellstrom@linux.intel.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210527144710.1975553-1-thomas.hellstrom@linux.intel.com> References: <20210527144710.1975553-1-thomas.hellstrom@linux.intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v5 05/15] drm/i915/ttm: Embed a ttm buffer object in the i915 gem object 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: , Cc: =?utf-8?q?Thomas_Hellstr=C3=B6m?= Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Embed a struct ttm_buffer_object into the i915 gem object, making sure we alias the gem object part. It's a bit unfortunate that the struct ttm_buffer_ojbect embeds a gem object since we otherwise could make the TTM part private to the TTM backend, and use the usual i915 gem object for the other backends. To make this a bit more storage efficient for the other backends, we'd have to use a pointer for the gem object which would require a lot of changes in the driver. We postpone that for later. Signed-off-by: Thomas Hellström Acked-by: Maarten Lankhorst --- drivers/gpu/drm/i915/gem/i915_gem_object.c | 7 +++++++ drivers/gpu/drm/i915/gem/i915_gem_object_types.h | 12 +++++++++++- 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c index 2be6109d0093..5706d471692d 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c @@ -62,6 +62,13 @@ void i915_gem_object_init(struct drm_i915_gem_object *obj, const struct drm_i915_gem_object_ops *ops, struct lock_class_key *key, unsigned flags) { + /* + * A gem object is embedded both in a struct ttm_buffer_object :/ and + * in a drm_i915_gem_object. Make sure they are aliased. + */ + BUILD_BUG_ON(offsetof(typeof(*obj), base) != + offsetof(typeof(*obj), __do_not_access.base)); + spin_lock_init(&obj->vma.lock); INIT_LIST_HEAD(&obj->vma.list); diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h index f5b46d11e6e6..d047ea126029 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h @@ -10,6 +10,7 @@ #include #include +#include #include #include "i915_active.h" @@ -99,7 +100,16 @@ struct i915_gem_object_page_iter { }; struct drm_i915_gem_object { - struct drm_gem_object base; + /* + * We might have reason to revisit the below since it wastes + * a lot of space for non-ttm gem objects. + * In any case, always use the accessors for the ttm_buffer_object + * when accessing it. + */ + union { + struct drm_gem_object base; + struct ttm_buffer_object __do_not_access; + }; const struct drm_i915_gem_object_ops *ops;