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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 315E7C10DCE for ; Wed, 18 Mar 2020 11:54:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F3B6920771 for ; Wed, 18 Mar 2020 11:54:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584532447; bh=L9X+VrJlSHvHryCDWyCIYjaqgiWMJHd2xRjgHoDrUnc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=bTF+dLkZ5vlZ/MQec6OoK90GiSE7wAgmw77t3i3uMXzJD8e+A4ZPL6eptbkT7wdPK kW56ihpPhjSgiyin0jrWPFYReR+/0JbiJmfyj8+NySZYYK7nxyNRDsfbLkMxYV93t8 kefnP0MaiQhRza2gt+PvFZVVckz1Oil7D8L5T15s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727236AbgCRLyF (ORCPT ); Wed, 18 Mar 2020 07:54:05 -0400 Received: from mail.kernel.org ([198.145.29.99]:34486 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726738AbgCRLyC (ORCPT ); Wed, 18 Mar 2020 07:54:02 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 963F52076D; Wed, 18 Mar 2020 11:54:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1584532442; bh=L9X+VrJlSHvHryCDWyCIYjaqgiWMJHd2xRjgHoDrUnc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=nBWYu8ErKBLAy75lRWkcPa5SdQBMw77hEoJ6xnVoyGil13sOFu3fNx8HI0VmEoGcM jC5lALrm+m+tuWKpFlI/lItovNV1RDNE7fjur1S7PxDLw1DMtMEgc50jVM5Ccypmv4 JP8IzfxDCqHK4kpyVabjr+GmbFUBMwLqWXscbnJo= Date: Wed, 18 Mar 2020 12:53:58 +0100 From: Greg KH To: Jolly Shah Cc: ard.biesheuvel@linaro.org, mingo@kernel.org, matt@codeblueprint.co.uk, sudeep.holla@arm.com, hkallweit1@gmail.com, keescook@chromium.org, dmitry.torokhov@gmail.com, michal.simek@xilinx.com, rajanv@xilinx.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Rajan Vaja , Jolly Shah , Tejas Patel Subject: Re: [PATCH v3 24/24] firmware: xilinx: Add sysfs and API to set boot health status Message-ID: <20200318115358.GE2472686@kroah.com> References: <1583538452-1992-1-git-send-email-jolly.shah@xilinx.com> <1583538452-1992-25-git-send-email-jolly.shah@xilinx.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1583538452-1992-25-git-send-email-jolly.shah@xilinx.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 06, 2020 at 03:47:32PM -0800, Jolly Shah wrote: > From: Rajan Vaja > > Add sysfs interface to set boot health status from user space. > Add API used by this interface to communicate with firmware. > > If PMUFW is compiled with CHECK_HEALTHY_BOOT, it will check the > healthy bit on FPD WDT expiration. If healthy bit is set by a user > application running in Linux, PMUFW will do APU only restart. If > healthy bit is not set during FPD WDT expiration, PMUFW will do > system restart. > > Signed-off-by: Rajan Vaja > Signed-off-by: Michal Simek > Signed-off-by: Jolly Shah > Signed-off-by: Tejas Patel > Signed-off-by: Jolly Shah > --- > .../ABI/stable/sysfs-driver-firmware-zynqmp | 21 ++++++++ > drivers/firmware/xilinx/zynqmp.c | 63 ++++++++++++++++++++++ > include/linux/firmware/xlnx-zynqmp.h | 3 ++ > 3 files changed, 87 insertions(+) > > diff --git a/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp b/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp > index b46ec0c..a37b408 100644 > --- a/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp > +++ b/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp > @@ -80,3 +80,24 @@ Description: > # echo "subsystem" > /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope > > Users: Xilinx > + > +What: /sys/devices/platform/firmware\:zynqmp-firmware/health_status > +Date: March 2020 > +KernelVersion: 5.6 > +Contact: "Jolly Shah" > +Description: > + This sysfs interface allows to set the health status. If PMUFW > + is compiled with CHECK_HEALTHY_BOOT, it will check the healthy > + bit on FPD WDT expiration. If healthy bit is set by a user > + application running in Linux, PMUFW will do APU only restart. If > + healthy bit is not set during FPD WDT expiration, PMUFW will do > + system restart. > + > + Usage: > + Set healthy bit > + # echo 1 > /sys/devices/platform/firmware\:zynqmp-firmware/health_status > + > + Unset healthy bit > + # echo 0 > /sys/devices/platform/firmware\:zynqmp-firmware/health_status > + > +Users: Xilinx > diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c > index 9caf1cf..fc3aa4e 100644 > --- a/drivers/firmware/xilinx/zynqmp.c > +++ b/drivers/firmware/xilinx/zynqmp.c > @@ -667,6 +667,21 @@ int zynqmp_pm_read_pggs(u32 index, u32 *value) > EXPORT_SYMBOL_GPL(zynqmp_pm_read_pggs); > > /** > + * zynqmp_pm_set_boot_health_status() - PM API for setting healthy boot status > + * @value Status value to be written > + * > + * This function sets healthy bit value to indicate boot health status > + * to firmware. > + * > + * @return Returns status, either success or error+reason > + */ > +int zynqmp_pm_set_boot_health_status(u32 value) > +{ > + return zynqmp_pm_invoke_fn(PM_IOCTL, 0, IOCTL_SET_BOOT_HEALTH_STATUS, > + value, 0, NULL); > +} > + > +/** > * zynqmp_pm_reset_assert - Request setting of reset (1 - assert, 0 - release) > * @reset: Reset to be configured > * @assert_flag: Flag stating should reset be asserted (1) or > @@ -995,6 +1010,53 @@ static const struct attribute_group shutdown_scope_attribute_group = { > }; > > /** > + * health_status_store - Store health_status sysfs attribute > + * @device: Device structure > + * @attr: Device attribute structure > + * @buf: User entered health_status attribute string > + * @count: Buffer size > + * > + * User-space interface for setting the boot health status. > + * Usage: echo > /sys/devices/platform/firmware\:zynqmp-firmware/health_status > + * > + * Value: > + * 1 - Set healthy bit to 1 > + * 0 - Unset healthy bit > + * > + * Return: count argument if request succeeds, the corresponding error > + * code otherwise > + */ > +static ssize_t health_status_store(struct device *device, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + int ret; > + unsigned int value; > + > + ret = kstrtouint(buf, 10, &value); > + if (ret) > + return ret; > + > + ret = zynqmp_pm_set_boot_health_status(value); > + if (ret) { > + pr_err("unable to set healthy bit value to %u\n", value); You have a valid struct device right there, use it! dev_err() please... thanks, greg k-h