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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 9823AC43215 for ; Fri, 22 Nov 2019 06:29:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7286920674 for ; Fri, 22 Nov 2019 06:29:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574404152; bh=WxhQkwHJIFJqmiQcam91kuSyvW8HP7Zb7M0NPoHGyNg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JU3FS0t/fRmjIiggZtksl03LIM4q+i5849IrqRWuW1L9RJUa+LnaRZMpi9ncGGf0A iGyuKR6+WABZrBqMhkDH9yTs3r2bLWbyr4vgkmO4uOFl2A18rjtpsByQPALLyjalFB 225HK6HcvcWoeB1KcM4GjSV6nQS72qGKY3TkcV10= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727470AbfKVFuD (ORCPT ); Fri, 22 Nov 2019 00:50:03 -0500 Received: from mail.kernel.org ([198.145.29.99]:54250 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727356AbfKVFty (ORCPT ); Fri, 22 Nov 2019 00:49:54 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6A5842068F; Fri, 22 Nov 2019 05:49:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574401794; bh=WxhQkwHJIFJqmiQcam91kuSyvW8HP7Zb7M0NPoHGyNg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dckV56jpcE//8u+3l5nSQZtyoeT5CHOdkrM06c/ScAGQcQobNu4ZETxPsPY4suDSI coLm8AVhpwiObYwWg9pr0H0MVAG/Gkqa2VMik05YtNlsjMqYxcqedGBBPuC5qLJKB2 NpTX7405+8vZ1W4kx7jH0wmuNtVsmyNvEcnOF34Q= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Harald Freudenberger , Martin Schwidefsky , Sasha Levin , linux-s390@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 041/219] s390/zcrypt: make sysfs reset attribute trigger queue reset Date: Fri, 22 Nov 2019 00:46:13 -0500 Message-Id: <20191122054911.1750-34-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191122054911.1750-1-sashal@kernel.org> References: <20191122054911.1750-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Harald Freudenberger [ Upstream commit 42a87d4103ae365e18c3be1333592ab583b8ad9d ] Until now there is no way to reset a AP queue or card. Driving a card or queue offline and online again does only toggle the 'software' online state. The only way to trigger a (hardware) reset is by running hot-unplug/hot-plug for example on the HMC. This patch makes the queue reset attribute in sysfs writable. Writing into this attribute triggers a reset on the AP queue's state machine. So the AP queue is flushed and state machine runs through the initial states which cause a reset (PQAP(RAPQ)) and a re-registration to interrupts (PQAP(AQIC)) if available. The reset sysfs attribute is writable by root only. So only an administrator is allowed to initiate a reset of AP queues. Please note that the queue's counter values are left untouched by the reset. Signed-off-by: Harald Freudenberger Signed-off-by: Martin Schwidefsky Signed-off-by: Sasha Levin --- drivers/s390/crypto/ap_queue.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/drivers/s390/crypto/ap_queue.c b/drivers/s390/crypto/ap_queue.c index 0aa4b3ccc948c..576ac08777c50 100644 --- a/drivers/s390/crypto/ap_queue.c +++ b/drivers/s390/crypto/ap_queue.c @@ -14,6 +14,9 @@ #include #include "ap_bus.h" +#include "ap_debug.h" + +static void __ap_flush_queue(struct ap_queue *aq); /** * ap_queue_enable_interruption(): Enable interruption on an AP queue. @@ -541,7 +544,25 @@ static ssize_t reset_show(struct device *dev, return rc; } -static DEVICE_ATTR_RO(reset); +static ssize_t reset_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ap_queue *aq = to_ap_queue(dev); + + spin_lock_bh(&aq->lock); + __ap_flush_queue(aq); + aq->state = AP_STATE_RESET_START; + ap_wait(ap_sm_event(aq, AP_EVENT_POLL)); + spin_unlock_bh(&aq->lock); + + AP_DBF(DBF_INFO, "reset queue=%02x.%04x triggered by user\n", + AP_QID_CARD(aq->qid), AP_QID_QUEUE(aq->qid)); + + return count; +} + +static DEVICE_ATTR_RW(reset); static ssize_t interrupt_show(struct device *dev, struct device_attribute *attr, char *buf) -- 2.20.1