From patchwork Tue Apr 21 18:10:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rishabh Bhatnagar X-Patchwork-Id: 11502057 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5E82E913 for ; Tue, 21 Apr 2020 18:10:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 45E9820663 for ; Tue, 21 Apr 2020 18:10:40 +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="j9piQE2N" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729092AbgDUSKk (ORCPT ); Tue, 21 Apr 2020 14:10:40 -0400 Received: from mail26.static.mailgun.info ([104.130.122.26]:44053 "EHLO mail26.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725870AbgDUSKj (ORCPT ); Tue, 21 Apr 2020 14:10:39 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1587492638; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=QTZSt3g7x8XrxZ1LJxXx1Az1VtPSffKIiAQZK87VL34=; b=j9piQE2NeVb8HRZw2JtfzR5az7ZrDUsJS6f6IAiGxlzYAHxs6oq4UQxZs6TXu4cj2VwpdrpF h3ceErxoAtqgbEyDGSo6A+22r5GUpE55PrD0wTERX4u7lo9hUP25ilN/qxpreZO0gBw4PIyB uhYEzjLztAjVtWeHVJ5JlX4I1AQ= X-Mailgun-Sending-Ip: 104.130.122.26 X-Mailgun-Sid: WyI4ZWZiZiIsICJsaW51eC1yZW1vdGVwcm9jQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== 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) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.0 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-remoteproc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@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