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 X-Spam-Level: X-Spam-Status: No, score=-3.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 978CBC4332D for ; Fri, 20 Mar 2020 23:36:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 64C5220714 for ; Fri, 20 Mar 2020 23:36:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="dEkSd3/b" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727479AbgCTXgb (ORCPT ); Fri, 20 Mar 2020 19:36:31 -0400 Received: from mail27.static.mailgun.info ([104.130.122.27]:58298 "EHLO mail27.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726738AbgCTXgb (ORCPT ); Fri, 20 Mar 2020 19:36:31 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1584747390; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=kzGBufw4XcOfd9u6lXmQ6aW6t3E2LZcw3C5ePtsICcM=; b=dEkSd3/btQP/+4M5NfL/4BnAJN/EXopRt5aYNRYiVwhs2ReNLXLZhwW0YcREl3ibUQh55YsD a0r9ldw/5Nf7K1HbdMglihgsae0dLyldIFtvfaSwLZLw4ir/PtHXectn2CDZ2L4hB+VosAPg qTYx1EIeTf4eTLjq1A85OfDLMLI= X-Mailgun-Sending-Ip: 104.130.122.27 X-Mailgun-Sid: WyI0MWYwYSIsICJsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5e75537c.7f43c15068f0-smtp-out-n02; Fri, 20 Mar 2020 23:36:28 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id ADEC9C433CB; Fri, 20 Mar 2020 23:36:27 +0000 (UTC) Received: from rishabhb-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: rishabhb) by smtp.codeaurora.org (Postfix) with ESMTPSA id 15BCFC433D2; Fri, 20 Mar 2020 23:36:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 15BCFC433D2 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=rishabhb@codeaurora.org From: Rishabh Bhatnagar To: linux-remoteproc-owner@vger.kernel.org, linux-kernel@vger.kernel.org, bjorn.andersson@linaro.org, mathieu.poirier@linaro.org Cc: psodagud@codeaurora.org, tsoni@codeaurora.org, sidgup@codeaurora.org, Rishabh Bhatnagar Subject: [PATCH 0/2] Add character device interface to remoteproc Date: Fri, 20 Mar 2020 16:36:15 -0700 Message-Id: <1584747377-14824-1-git-send-email-rishabhb@codeaurora.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch series adds a character device interface to remoteproc framework. This interface can be used by userspace clients in order to boot and shutdown the remote processor. Currently there is only a sysfs interface which the userspace clients can use. If a usersapce application crashes after booting the remote processor through the sysfs interface the remote processor does not get any indication about the crash. It might still assume that the application is running. For example modem uses remotefs service to data from disk/flash memory. If the remotefs service crashes, modem still keeps on requesting data which might lead to crash on modem. Even if the service is restarted the file handles modem requested previously would become stale. Adding a character device interface makes the remote processor tightly coupled with the user space application. A crash of the application leads to a close on the file descriptors therefore shutting down the remoteproc. Rishabh Bhatnagar (2): remoteproc: Add userspace char device driver remoteproc: core: Register the character device interface drivers/remoteproc/Makefile | 1 + drivers/remoteproc/remoteproc_core.c | 8 +- drivers/remoteproc/remoteproc_internal.h | 3 + drivers/remoteproc/remoteproc_userspace.c | 126 ++++++++++++++++++++++++++++++ include/linux/remoteproc.h | 2 + 5 files changed, 139 insertions(+), 1 deletion(-) create mode 100644 drivers/remoteproc/remoteproc_userspace.c -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project