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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, 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 3D6C3C43381 for ; Thu, 28 Mar 2019 12:40:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 11F8E2173C for ; Thu, 28 Mar 2019 12:40:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727724AbfC1Mj6 (ORCPT ); Thu, 28 Mar 2019 08:39:58 -0400 Received: from mga09.intel.com ([134.134.136.24]:34151 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726971AbfC1Mgn (ORCPT ); Thu, 28 Mar 2019 08:36:43 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 28 Mar 2019 05:36:41 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,280,1549958400"; d="scan'208";a="138009642" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga003.jf.intel.com with ESMTP; 28 Mar 2019 05:36:39 -0700 Received: by black.fi.intel.com (Postfix, from userid 1001) id 538268B4; Thu, 28 Mar 2019 14:36:34 +0200 (EET) From: Mika Westerberg To: linux-kernel@vger.kernel.org Cc: Michael Jamet , Yehezkel Bernat , Andreas Noever , Lukas Wunner , "David S . Miller" , Andy Shevchenko , Christian Kellner , Mario.Limonciello@dell.com, Mika Westerberg , netdev@vger.kernel.org Subject: [PATCH v3 12/36] thunderbolt: Properly disable path Date: Thu, 28 Mar 2019 15:36:09 +0300 Message-Id: <20190328123633.42882-13-mika.westerberg@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190328123633.42882-1-mika.westerberg@linux.intel.com> References: <20190328123633.42882-1-mika.westerberg@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We need to wait until all buffers have been drained before the path can be considered disabled. Do this for every hop in a path. Also if the switch is physically disconnected, do not bother disabling it anymore (it is not present anyway). This adds another bit field to struct tb_regs_hop even if we are trying to get rid of them but we can clean them up another day. Signed-off-by: Mika Westerberg --- drivers/thunderbolt/path.c | 48 ++++++++++++++++++++++++++++++++--- drivers/thunderbolt/tb_regs.h | 3 ++- 2 files changed, 47 insertions(+), 4 deletions(-) diff --git a/drivers/thunderbolt/path.c b/drivers/thunderbolt/path.c index a11956522bac..97f37f86fb75 100644 --- a/drivers/thunderbolt/path.c +++ b/drivers/thunderbolt/path.c @@ -7,6 +7,8 @@ #include #include +#include +#include #include "tb.h" @@ -74,13 +76,53 @@ static void __tb_path_deallocate_nfc(struct tb_path *path, int first_hop) } } +static int __tb_path_deactivate_hop(struct tb_port *port, int hop_index) +{ + struct tb_regs_hop hop; + ktime_t timeout; + int ret; + + if (port->sw->is_unplugged) + return 0; + + /* Disable the path */ + ret = tb_port_read(port, &hop, TB_CFG_HOPS, 2 * hop_index, 2); + if (ret) + return ret; + + /* Already disabled */ + if (!hop.enable) + return 0; + + hop.enable = 0; + + ret = tb_port_write(port, &hop, TB_CFG_HOPS, 2 * hop_index, 2); + if (ret) + return ret; + + /* Wait until it is drained */ + timeout = ktime_add_ms(ktime_get(), 500); + do { + ret = tb_port_read(port, &hop, TB_CFG_HOPS, 2 * hop_index, 2); + if (ret) + return ret; + + if (!hop.pending) + return 0; + + usleep_range(10, 20); + } while (ktime_before(ktime_get(), timeout)); + + return -ETIMEDOUT; +} + static void __tb_path_deactivate_hops(struct tb_path *path, int first_hop) { int i, res; - struct tb_regs_hop hop = { }; + for (i = first_hop; i < path->path_length; i++) { - res = tb_port_write(path->hops[i].in_port, &hop, TB_CFG_HOPS, - 2 * path->hops[i].in_hop_index, 2); + res = __tb_path_deactivate_hop(path->hops[i].in_port, + path->hops[i].in_hop_index); if (res) tb_port_warn(path->hops[i].in_port, "hop deactivation failed for hop %d, index %d\n", diff --git a/drivers/thunderbolt/tb_regs.h b/drivers/thunderbolt/tb_regs.h index 1ab6e0fb31c0..82ac4ec8757f 100644 --- a/drivers/thunderbolt/tb_regs.h +++ b/drivers/thunderbolt/tb_regs.h @@ -234,7 +234,8 @@ struct tb_regs_hop { bool egress_fc:1; bool ingress_shared_buffer:1; bool egress_shared_buffer:1; - u32 unknown3:4; /* set to zero */ + bool pending:1; + u32 unknown3:3; /* set to zero */ } __packed; /* Common link controller registers */ -- 2.20.1