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=-3.6 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 3FB19C54FC9 for ; Tue, 21 Apr 2020 18:10:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 15F5E20663 for ; Tue, 21 Apr 2020 18:10:36 +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="E/uCAeVF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729200AbgDUSKf (ORCPT ); Tue, 21 Apr 2020 14:10:35 -0400 Received: from mail27.static.mailgun.info ([104.130.122.27]:18414 "EHLO mail27.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725870AbgDUSKe (ORCPT ); Tue, 21 Apr 2020 14:10:34 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1587492634; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=QTZSt3g7x8XrxZ1LJxXx1Az1VtPSffKIiAQZK87VL34=; b=E/uCAeVFlAehIutz0dEhGOkF/Dzi2EtD6VLjC4buAe7PhiCj8RouVz574mzULjdugyAVFclM Qutb7TZ0Zzr2lypW7OxGWI2/ZQkIM7CBRYh8WS+W6taF02dIKgnfFlGBpBpwfRED47pJTyvi wF/GQrGpWvjw8P57ilvYFkIAPp0= 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 5e9f3712.7f4b6bf29ed8-smtp-out-n02; Tue, 21 Apr 2020 18:10:26 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 8E690C433BA; Tue, 21 Apr 2020 18:10:26 +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 2FF91C433CB; Tue, 21 Apr 2020 18:10:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 2FF91C433CB 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@vger.kernel.org, linux-kernel@vger.kernel.org Cc: bjorn.andersson@linaro.org, mathieu.poirier@linaro.org, ohad@wizery.com, tsoni@codeaurora.org, psodagud@codeaurora.org, sidgup@codeaurora.org, Rishabh Bhatnagar Subject: [PATCH v3 0/2] Add character device interface to remoteproc Date: Tue, 21 Apr 2020 11:10:16 -0700 Message-Id: <1587492618-15896-1-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. 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. Changelog: v2 -> v3: - Move booting of remoteproc from open to a write call. - Add ioctl interface for future functionality extension. - Add an ioctl call to default to rproc shutdown on release. v2 -> v1: - Fixed comments from Bjorn and Matthew. Rishabh Bhatnagar (2): remoteproc: Add remoteproc character device interface remoteproc: core: Register the character device interface Documentation/userspace-api/ioctl/ioctl-number.rst | 1 + drivers/remoteproc/Kconfig | 9 ++ drivers/remoteproc/Makefile | 1 + drivers/remoteproc/remoteproc_cdev.c | 142 +++++++++++++++++++++ drivers/remoteproc/remoteproc_core.c | 10 ++ drivers/remoteproc/remoteproc_internal.h | 21 +++ include/linux/remoteproc.h | 3 + include/uapi/linux/remoteproc_cdev.h | 21 +++ 8 files changed, 208 insertions(+) create mode 100644 drivers/remoteproc/remoteproc_cdev.c create mode 100644 include/uapi/linux/remoteproc_cdev.h -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project