From patchwork Wed May 15 11:23:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?WW9uZyBXdSAo5ZC05YuHKQ==?= X-Patchwork-Id: 13665100 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 BE2D4C25B75 for ; Wed, 15 May 2024 11:23:59 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 06F2F10E5BA; Wed, 15 May 2024 11:23:59 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=mediatek.com header.i=@mediatek.com header.b="YSSbYq5r"; dkim-atps=neutral Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by gabe.freedesktop.org (Postfix) with ESMTPS id B548D10E5BA for ; Wed, 15 May 2024 11:23:56 +0000 (UTC) X-UUID: 9a7ddfe812ad11ef8065b7b53f7091ad-20240515 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=NarYFV9zitHC0a/dKQv6CpzSu0O4WzMUjZiRTiPvYRk=; b=YSSbYq5rADUMeehe1983rnEkN9+hymohAMwkvULLv2NGUbdSDdc75vCfEuQMRRxHu2fuDC1hRZCKmLZQN+9ebyiO4jn2WRy2L9yZEe2ak9zw/spDdkfgxTcWQ3MBbAhN8eIZyOE6tY/0RfanMiQBmVFTkRxkaAPKnF0yGycA/7o=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.38, REQID:6bcbe974-3b56-4b5a-a3da-f17ea27eea34, IP:0, U RL:0,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:-5 X-CID-META: VersionHash:82c5f88, CLOUDID:98c81ffc-ed05-4274-9204-014369d201e8, B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:0,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1, SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-UUID: 9a7ddfe812ad11ef8065b7b53f7091ad-20240515 Received: from mtkmbs09n1.mediatek.inc [(172.21.101.35)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1038484702; Wed, 15 May 2024 19:23:50 +0800 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by MTKMBS09N2.mediatek.inc (172.21.101.94) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Wed, 15 May 2024 04:23:48 -0700 Received: from mhfsdcap04.gcn.mediatek.inc (10.17.3.154) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Wed, 15 May 2024 19:23:47 +0800 From: Yong Wu To: Rob Herring , Matthias Brugger , , Sumit Semwal , Andrew Morton CC: Krzysztof Kozlowski , Conor Dooley , Benjamin Gaignard , Brian Starkey , John Stultz , , AngeloGioacchino Del Regno , Yong Wu , , , , , , , , Robin Murphy , Vijayanand Jitta , Joakim Bech , Jeffrey Kardatzke , Pavel Machek , Simon Ser , Pekka Paalanen , , Logan Gunthorpe , Daniel Vetter , , , Subject: [PATCH v5 2/9] scatterlist: Add a flag for the restricted memory Date: Wed, 15 May 2024 19:23:01 +0800 Message-ID: <20240515112308.10171-3-yong.wu@mediatek.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240515112308.10171-1-yong.wu@mediatek.com> References: <20240515112308.10171-1-yong.wu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Introduce a FLAG for the restricted memory which means the memory is protected by TEE or hypervisor, then it's inaccessiable for kernel. Currently we don't use sg_dma_unmark_restricted, thus this interface has not been added. Signed-off-by: Yong Wu --- include/linux/scatterlist.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 77df3d7b18a6..a6ad9018eca0 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -282,6 +282,7 @@ static inline void sg_unmark_end(struct scatterlist *sg) #define SG_DMA_BUS_ADDRESS (1 << 0) #define SG_DMA_SWIOTLB (1 << 1) +#define SG_DMA_RESTRICTED (2 << 1) /** * sg_dma_is_bus_address - Return whether a given segment was marked @@ -352,6 +353,31 @@ static inline void sg_dma_mark_swiotlb(struct scatterlist *sg) sg->dma_flags |= SG_DMA_SWIOTLB; } +/** + * sg_dma_mark_restricted - Mark the scatterlist for restricted buffer. + * @sg: SG entry + * + * Description: + * Marks a a scatterlist for the restricted buffer that may be inaccessiable + * in kernel if it is protected. + */ +static inline void sg_dma_mark_restricted(struct scatterlist *sg) +{ + sg->dma_flags |= SG_DMA_RESTRICTED; +} + +/** + * sg_dma_is_restricted - Return whether the scatterlist was marked as restricted + * buffer. + * @sg: SG entry + * + * Description: + * Returns true if the scatterlist was marked as restricted buffer. + */ +static inline bool sg_dma_is_restricted(struct scatterlist *sg) +{ + return sg->dma_flags & SG_DMA_RESTRICTED; +} #else static inline bool sg_dma_is_bus_address(struct scatterlist *sg) @@ -372,6 +398,14 @@ static inline void sg_dma_mark_swiotlb(struct scatterlist *sg) { } +static inline bool sg_dma_is_restricted(struct scatterlist *sg) +{ + return false; +} + +static inline void sg_dma_mark_restrited(struct scatterlist *sg) +{ +} #endif /* CONFIG_NEED_SG_DMA_FLAGS */ /**