From patchwork Tue May 30 23:36:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Andersson X-Patchwork-Id: 13261210 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 102EBC7EE31 for ; Tue, 30 May 2023 23:37:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233650AbjE3XhC (ORCPT ); Tue, 30 May 2023 19:37:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57962 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233353AbjE3XhA (ORCPT ); Tue, 30 May 2023 19:37:00 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 11E93106; Tue, 30 May 2023 16:36:59 -0700 (PDT) Received: from pps.filterd (m0279865.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 34UN4pWA011423; Tue, 30 May 2023 23:36:50 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=qcppdkim1; bh=EE//b1snTAVZKu4seqX0NMsp4006NwEPtqjn92nqbh8=; b=O+iBmk3ASDZAsT1S/73hUUONQLOZlpL95DNOKWCjTUigCg8AedS/t+aq/RTM7tjOyFpM IrffRpgeuorB8S8ZoOQgNdZFSp0cMNe76ROQKjJUdgd7eYHzdUt4C4+2S1qhijEGM+CI p4S8jz/f/q7DZW/R0sHu7vYV9vc/uSwr4Ur4jSXM3L57w4ZpvcY282+gRLji+zF4M7cV wpd8q2pWJKZooDEg5CW7Kzaw9Pjud4Ks9Nn3WXjCLOsem1ID+KoP1Je2xrhNHQ3uVRhn whvT4OZ4r23E71xovgzD9nsAnMeP6Llrvg2n/yzHJzeJ5+mYgREds/uSJEmPuUC3FvwV nA== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3qw8v4tbfn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 30 May 2023 23:36:50 +0000 Received: from nalasex01c.na.qualcomm.com (nalasex01c.na.qualcomm.com [10.47.97.35]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 34UNan1C001333 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 30 May 2023 23:36:49 GMT Received: from hu-bjorande-lv.qualcomm.com (10.49.16.6) by nalasex01c.na.qualcomm.com (10.47.97.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.42; Tue, 30 May 2023 16:36:49 -0700 From: Bjorn Andersson To: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley CC: , , Subject: [PATCH v2 1/3] dt-bindings: reserved-memory: rmtfs: Allow guard pages Date: Tue, 30 May 2023 16:36:41 -0700 Message-ID: <20230530233643.4044823-2-quic_bjorande@quicinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230530233643.4044823-1-quic_bjorande@quicinc.com> References: <20230530233643.4044823-1-quic_bjorande@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) To nalasex01c.na.qualcomm.com (10.47.97.35) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: nUnLj9DhM4-9yxA-PRdmxfa_Xu2l5vBs X-Proofpoint-GUID: nUnLj9DhM4-9yxA-PRdmxfa_Xu2l5vBs X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-05-30_17,2023-05-30_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 impostorscore=0 spamscore=0 phishscore=0 malwarescore=0 bulkscore=0 adultscore=0 mlxscore=0 mlxlogscore=999 priorityscore=1501 clxscore=1015 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2304280000 definitions=main-2305300193 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On some Qualcomm platforms it's required that the rmtfs memory is not placed adjacent to allocations performed by other clients. Some DeviceTree authors have solved this by reserving the space around the region, but this prevents such author to use rely on the OS to place the region, through the use of "size" (instead of a fixed location). So introduce a flag to indicate that guard pages should be carved at the beginning and end of the memory region. The user shall account for the two 4k blocks in the defined size. Signed-off-by: Bjorn Andersson --- Changes since v1: - Drop qcom,alloc-size in favour of using reserved-memory/size - Introduce explicit property to signal that guard pages should be carved out from this region (rather than always do it in the dynamic case). .../bindings/reserved-memory/qcom,rmtfs-mem.yaml | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/devicetree/bindings/reserved-memory/qcom,rmtfs-mem.yaml b/Documentation/devicetree/bindings/reserved-memory/qcom,rmtfs-mem.yaml index bab982f00485..26e24e7b08cf 100644 --- a/Documentation/devicetree/bindings/reserved-memory/qcom,rmtfs-mem.yaml +++ b/Documentation/devicetree/bindings/reserved-memory/qcom,rmtfs-mem.yaml @@ -26,6 +26,13 @@ properties: description: > identifier of the client to use this region for buffers + qcom,use-guard-pages: + type: boolean + description: > + Indicates that the OS should ignore the first and last 4k block of the + memory region, for the purpose of ensuring that the allocation is not + adjacent to other protected regions. + qcom,vmid: $ref: /schemas/types.yaml#/definitions/uint32-array description: >