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 70FEEEDA687 for ; Tue, 3 Mar 2026 15:20:58 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3822110E830; Tue, 3 Mar 2026 15:20:58 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="hgs3690G"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.14]) by gabe.freedesktop.org (Postfix) with ESMTPS id 291FE10E830 for ; Tue, 3 Mar 2026 15:20:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1772551257; x=1804087257; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=mR/1Ag8nxabknfDREChp/hbY7uHHGnWSJEFWCvXD7zU=; b=hgs3690GClxf+QrrDWSXfuN2D6A6m9bmTZk0MEh6+cLrECIERCDLzfbP wwMiL3JOVuK3yYFSQeqJF2toCOGwvpnlyE8cZZ0RH0u0i6nzZDbUb/1IE BNV+vNE8bo8eknR5xOZUhb5MosGoAvtDJP+f7u55lgg3V1xRvWDI6ISlY i3/TbRQsp0Zw1Q18Gre/lZbkwckrL8/UKdKTMhcqFkL6dWzpQomJ+pPUv 4uOjgkZ2TBYjV+BaJG6U3yhIsXH6su75olPQhjbvBOdWo5h//7myJUFZJ U23lRhrQ2W6+aOkVeeoIwsqLsnIIuUnqMK5VFBqRE+GemoU1ju9avti08 Q==; X-CSE-ConnectionGUID: 4cV31B5lT3elqkHag8KqTA== X-CSE-MsgGUID: 10TnVO82TLaL+W9z74212w== X-IronPort-AV: E=McAfee;i="6800,10657,11718"; a="73655964" X-IronPort-AV: E=Sophos;i="6.21,322,1763452800"; d="scan'208";a="73655964" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Mar 2026 07:20:57 -0800 X-CSE-ConnectionGUID: cUQBMPy6TOaVR9XVvKC7cw== X-CSE-MsgGUID: C5IX3G+iQCalHaFFhtgG2A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,322,1763452800"; d="scan'208";a="222506941" Received: from varungup-desk.iind.intel.com ([10.190.238.71]) by orviesa004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Mar 2026 07:20:56 -0800 From: Arvind Yadav To: intel-xe@lists.freedesktop.org Cc: matthew.brost@intel.com, himal.prasad.ghimiray@intel.com, thomas.hellstrom@linux.intel.com, pallavi.mishra@intel.com Subject: [PATCH v6 09/12] drm/xe/dma_buf: Block export of DONTNEED/purged BOs Date: Tue, 3 Mar 2026 20:50:05 +0530 Message-ID: <20260303152015.3499248-10-arvind.yadav@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260303152015.3499248-1-arvind.yadav@intel.com> References: <20260303152015.3499248-1-arvind.yadav@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" Don't allow exporting BOs marked DONTNEED or PURGED as dma-bufs. DONTNEED BOs can have their contents discarded at any time, making the exported dma-buf unusable for external devices. PURGED BOs have no backing store and are permanently invalid. Return -EBUSY for DONTNEED BOs (temporary purgeable state) and -EINVAL for purged BOs (permanent, no backing store). The export path now checks the BO's purgeable state before creating the dma-buf, preventing external devices from accessing memory that may be purged at any time. v6: - Split DONTNEED → -EBUSY and PURGED → -EINVAL for consistency with the rest of the series (Thomas, Matt) Cc: Matthew Brost Cc: Thomas Hellström Cc: Himal Prasad Ghimiray Signed-off-by: Arvind Yadav --- drivers/gpu/drm/xe/xe_dma_buf.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/gpu/drm/xe/xe_dma_buf.c b/drivers/gpu/drm/xe/xe_dma_buf.c index ea370cd373e9..aba6b9696030 100644 --- a/drivers/gpu/drm/xe/xe_dma_buf.c +++ b/drivers/gpu/drm/xe/xe_dma_buf.c @@ -223,6 +223,23 @@ struct dma_buf *xe_gem_prime_export(struct drm_gem_object *obj, int flags) if (bo->vm) return ERR_PTR(-EPERM); + /* + * Reject exporting purgeable BOs. DONTNEED BOs can be purged + * at any time, making the exported dma-buf unusable. Purged BOs + * have no backing store and are permanently invalid. + */ + xe_bo_lock(bo, false); + if (xe_bo_madv_is_dontneed(bo)) { + ret = -EBUSY; + goto out_unlock; + } + + if (xe_bo_is_purged(bo)) { + ret = -EINVAL; + goto out_unlock; + } + xe_bo_unlock(bo); + ret = ttm_bo_setup_export(&bo->ttm, &ctx); if (ret) return ERR_PTR(ret); @@ -232,6 +249,10 @@ struct dma_buf *xe_gem_prime_export(struct drm_gem_object *obj, int flags) buf->ops = &xe_dmabuf_ops; return buf; + +out_unlock: + xe_bo_unlock(bo); + return ERR_PTR(ret); } static struct drm_gem_object * -- 2.43.0