From patchwork Mon Sep 17 16:39:53 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 10603067 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 33BAC17EE for ; Mon, 17 Sep 2018 16:40:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2933A29DC9 for ; Mon, 17 Sep 2018 16:40:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2758129E83; Mon, 17 Sep 2018 16:40:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C45EA2A1D6 for ; Mon, 17 Sep 2018 16:40:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728730AbeIQWIO (ORCPT ); Mon, 17 Sep 2018 18:08:14 -0400 Received: from albert.telenet-ops.be ([195.130.137.90]:42658 "EHLO albert.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727736AbeIQWIO (ORCPT ); Mon, 17 Sep 2018 18:08:14 -0400 Received: from ramsan.of.borg ([84.194.111.163]) by albert.telenet-ops.be with bizsmtp id cgg31y00o3XaVaC06gg3sV; Mon, 17 Sep 2018 18:40:04 +0200 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtp (Exim 4.86_2) (envelope-from ) id 1g1wZ9-0006b8-D9; Mon, 17 Sep 2018 18:40:03 +0200 Received: from geert by rox.of.borg with local (Exim 4.90_1) (envelope-from ) id 1g1wZ9-0004xh-AI; Mon, 17 Sep 2018 18:40:03 +0200 From: Geert Uytterhoeven To: Philipp Zabel , Eric Auger , Alex Williamson Cc: kvm@vger.kernel.org, devicetree@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH/RFC v4 0/2] vfio: platform: Add generic reset controller support Date: Mon, 17 Sep 2018 18:39:53 +0200 Message-Id: <20180917163955.19023-1-geert+renesas@glider.be> X-Mailer: git-send-email 2.17.1 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Hi all, This patch series implements generic reset controller support for vfio-platform, for devices that are connected to an SoC-internal reset controller and can be reset in a generic way. This avoids having to write/change a vfio-specific reset driver for each and every device to be passed-through to a guest. It consists of two patches: - The first patch enhances the reset controller subsystem to add support for dedicated resets. This addresses the issue that even reset_control_get_exclusive() does not guarantee that we have an exclusive wire between the device and the reset controller. - The second patch enhances vfio-platform to add generic reset controller support. Changes compared to v3: - Add Reviewed-by, - New patch "reset: Add support for dedicated reset controls", - Use new RFC reset_control_get_dedicated() instead of of_reset_control_get_exclusive(), to (a) make it more generic, and (b) make sure the reset returned is really a dedicated reset, and does not affect other devices, - Drop vfio-platform reset leak fix, which has been applied. Changes compared to v2: - Add Reviewed-by, - Merge similar checks in vfio_platform_has_reset(). Changes compared to v1: - Add Reviewed-by, - Don't store error values in vdev->reset_control, - Use of_reset_control_get_exclusive() instead of __of_reset_control_get(), - Improve description. This has been tested on R-Car H3/Salvator-XS: - SATA can be exported, as it has a dedicated reset, - PWM1 cannot, as its reset is shared with all other PWM modules: "VFIO: No reset function found for device e6e31000.pwm". Thanks for your comments! Geert Uytterhoeven (2): [RFC] reset: Add support for dedicated reset controls [RFC] vfio: platform: Add generic reset controller support drivers/reset/core.c | 76 ++++++++++++++++--- drivers/vfio/platform/vfio_platform_common.c | 20 ++++- drivers/vfio/platform/vfio_platform_private.h | 1 + include/linux/reset.h | 60 ++++++++++----- 4 files changed, 126 insertions(+), 31 deletions(-)