From patchwork Wed Nov 16 12:16:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: MD Danish Anwar X-Patchwork-Id: 13045083 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 01179C4332F for ; Wed, 16 Nov 2022 12:19:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238595AbiKPMTd (ORCPT ); Wed, 16 Nov 2022 07:19:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34862 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238266AbiKPMTC (ORCPT ); Wed, 16 Nov 2022 07:19:02 -0500 Received: from fllv0016.ext.ti.com (fllv0016.ext.ti.com [198.47.19.142]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C981818E36; Wed, 16 Nov 2022 04:16:55 -0800 (PST) Received: from lelv0266.itg.ti.com ([10.180.67.225]) by fllv0016.ext.ti.com (8.15.2/8.15.2) with ESMTP id 2AGCGkwR058271; Wed, 16 Nov 2022 06:16:46 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1668601006; bh=cLDcxht+GZb1N7QGNbVmOg3psxKJsN5LhlYIFPJxwHM=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=SiKg5ErfBQ+amsib/kAMOuklIbJ6GDDAVx9UCpsRI2AdV2I29f+t2wwax+qxiMNU9 QHtxfWsVpjtU3ri2iUxnuALze6GhqTxNXRh2S4Y/4O8Z27jzfWJryFzdZc7FD9IOUK 9x166AjPi3hA91QCTzZcJ6D6JWLlRryxxkZCnoyk= Received: from DLEE104.ent.ti.com (dlee104.ent.ti.com [157.170.170.34]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 2AGCGkcn080326 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 16 Nov 2022 06:16:46 -0600 Received: from DLEE101.ent.ti.com (157.170.170.31) by DLEE104.ent.ti.com (157.170.170.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.6; Wed, 16 Nov 2022 06:16:46 -0600 Received: from fllv0039.itg.ti.com (10.64.41.19) by DLEE101.ent.ti.com (157.170.170.31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.6 via Frontend Transport; Wed, 16 Nov 2022 06:16:46 -0600 Received: from fllv0122.itg.ti.com (fllv0122.itg.ti.com [10.247.120.72]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 2AGCGk7f080233; Wed, 16 Nov 2022 06:16:46 -0600 Received: from localhost (a0501179-pc.dhcp.ti.com [10.24.69.114]) by fllv0122.itg.ti.com (8.14.7/8.14.7) with ESMTP id 2AGCGjmg013735; Wed, 16 Nov 2022 06:16:45 -0600 From: MD Danish Anwar To: Mathieu Poirier , Krzysztof Kozlowski , Rob Herring CC: Suman Anna , Roger Quadros , "Andrew F . Davis" , , , , , , , , MD Danish Anwar Subject: [PATCH v8 4/6] remoteproc: pru: Make sysfs entries read-only for PRU client driven boots Date: Wed, 16 Nov 2022 17:46:32 +0530 Message-ID: <20221116121634.2901265-5-danishanwar@ti.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221116121634.2901265-1-danishanwar@ti.com> References: <20221116121634.2901265-1-danishanwar@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. Co-developed-by: Suman Anna Co-developed-by: Grzegorz Jaszczyk Co-developed-by: Puranjay Mohan Signed-off-by: MD Danish Anwar --- 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 7d4ed39b3772..bca7550d79d2 100644 --- a/drivers/remoteproc/pru_rproc.c +++ b/drivers/remoteproc/pru_rproc.c @@ -228,6 +228,7 @@ struct rproc *pru_rproc_get(struct device_node *np, int index, } pru->client_np = np; + rproc->sysfs_read_only = true; mutex_unlock(&pru->lock); @@ -266,6 +267,7 @@ void pru_rproc_put(struct rproc *rproc) } pru->client_np = NULL; + rproc->sysfs_read_only = false; mutex_unlock(&pru->lock); rproc_put(rproc);