From patchwork Fri Jun 3 12:15:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Puranjay Mohan X-Patchwork-Id: 12869020 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 BAAAEC433EF for ; Fri, 3 Jun 2022 12:15:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244188AbiFCMPj (ORCPT ); Fri, 3 Jun 2022 08:15:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53478 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240041AbiFCMPh (ORCPT ); Fri, 3 Jun 2022 08:15:37 -0400 Received: from lelv0143.ext.ti.com (lelv0143.ext.ti.com [198.47.23.248]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 576B839826; Fri, 3 Jun 2022 05:15:36 -0700 (PDT) Received: from lelv0265.itg.ti.com ([10.180.67.224]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id 253CFTTv122110; Fri, 3 Jun 2022 07:15:29 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1654258529; bh=4Z/SWcBdgq7gJXZF6aYCxpS+F1uJ0waLtD4QLHJH0F4=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=urgzThK/GESeFMPn7ZrCMnYHvnkLI2lYcjjgxk43IXIXOm1QmwyIMEz2DhdcuQAMc XPyfWD8bNAEkvg5/XJ35pbBNXkxIfolsN/NNmx/JW71pQJ0Llt+N/ugvPjmcdzYFiT CH16CA2x94OrfNVEPmbwgPruulFGVinceDaAfIMs= Received: from DFLE101.ent.ti.com (dfle101.ent.ti.com [10.64.6.22]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 253CFTiM031421 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 3 Jun 2022 07:15:29 -0500 Received: from DFLE115.ent.ti.com (10.64.6.36) by DFLE101.ent.ti.com (10.64.6.22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14; Fri, 3 Jun 2022 07:15:28 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE115.ent.ti.com (10.64.6.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2308.14 via Frontend Transport; Fri, 3 Jun 2022 07:15:28 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 253CFRMM025776; Fri, 3 Jun 2022 07:15:28 -0500 From: Puranjay Mohan To: CC: , , , , , , , , , , , , , , Subject: [PATCH v4 3/6] remoteproc: pru: Make sysfs entries read-only for PRU client driven boots Date: Fri, 3 Jun 2022 17:45:17 +0530 Message-ID: <20220603121520.13730-4-p-mohan@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220603121520.13730-1-p-mohan@ti.com> References: <20220603121520.13730-1-p-mohan@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org From: Suman Anna The PRU remoteproc driver is not configured for 'auto-boot' by default, and allows to be booted either by in-kernel PRU client drivers or by userspace using the generic remoteproc sysfs interfaces. The sysfs interfaces should not be permitted to change the remoteproc firmwares or states when a PRU is being managed by an in-kernel client driver. Use the newly introduced remoteproc generic 'sysfs_read_only' flag to provide these restrictions by setting and clearing it appropriately during the PRU acquire and release steps. Signed-off-by: Suman Anna Co-developed-by: Grzegorz Jaszczyk Signed-off-by: Grzegorz Jaszczyk Signed-off-by: Puranjay Mohan --- drivers/remoteproc/pru_rproc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c index 7a35b400287a..9fed3e0372d3 100644 --- a/drivers/remoteproc/pru_rproc.c +++ b/drivers/remoteproc/pru_rproc.c @@ -231,6 +231,7 @@ struct rproc *pru_rproc_get(struct device_node *np, int index, } pru->client_np = np; + rproc->sysfs_read_only = true; mutex_unlock(&pru->lock); @@ -265,6 +266,7 @@ void pru_rproc_put(struct rproc *rproc) } pru->client_np = NULL; + rproc->sysfs_read_only = false; mutex_unlock(&pru->lock); put_device(&rproc->dev);