From patchwork Sat Dec 17 14:39:39 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukas Wunner X-Patchwork-Id: 706713 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3tgqf14R2bz9t2b for ; Sun, 18 Dec 2016 01:42:33 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755225AbcLQOmb (ORCPT ); Sat, 17 Dec 2016 09:42:31 -0500 Received: from mailout3.hostsharing.net ([176.9.242.54]:59657 "EHLO mailout3.hostsharing.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756618AbcLQOma (ORCPT ); Sat, 17 Dec 2016 09:42:30 -0500 Received: from h08.hostsharing.net (h08.hostsharing.net [83.223.95.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mailout3.hostsharing.net (Postfix) with ESMTPS id 179E0103E8606; Sat, 17 Dec 2016 15:42:29 +0100 (CET) Received: from localhost (3-38-90-81.adsl.cmo.de [81.90.38.3]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA (128/128 bits)) (No client certificate requested) by h08.hostsharing.net (Postfix) with ESMTPSA id 8721960857A6; Sat, 17 Dec 2016 15:42:26 +0100 (CET) X-Mailbox-Line: From 541d11e1d18f6bba3cf2454ba8c119ab31dc3655 Mon Sep 17 00:00:00 2001 Message-Id: <541d11e1d18f6bba3cf2454ba8c119ab31dc3655.1481926599.git.lukas@wunner.de> In-Reply-To: References: From: Lukas Wunner Date: Sat, 17 Dec 2016 15:39:39 +0100 Subject: [PATCH v3 7/7] thunderbolt: Runtime suspend NHI when idle To: Greg Kroah-Hartman , linux-kernel@vger.kernel.org Cc: Andreas Noever , linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Tomas Winkler , Amir Levy Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Runtime suspend the NHI when no Thunderbolt devices have been plugged in for 10 sec (user-configurable via autosuspend_delay_ms in sysfs). The NHI is not able to detect plug events while suspended, it relies on the GPE handler to resume it on hotplug. After the NHI resumes, it takes about 700 ms until a hotplug event appears on the RX ring. In case autosuspend_delay_ms has been reduced to 0 by the user, we need to wait in tb_resume() to avoid going back to sleep before we had a chance to detect a hotplugged device. A runtime pm ref is held for the duration of tb_handle_hotplug() to keep the NHI awake while the hotplug event is processed. Apart from that we acquire a runtime pm ref for each newly allocated switch (except for the root switch) and drop one when a switch is freed, thereby ensuring the NHI stays active as long as devices are plugged in. This behaviour is identical to the macOS driver. Cc: Andreas Noever Signed-off-by: Lukas Wunner --- drivers/thunderbolt/nhi.c | 2 ++ drivers/thunderbolt/power.c | 9 +++++++++ drivers/thunderbolt/switch.c | 9 +++++++++ drivers/thunderbolt/tb.c | 13 +++++++++++++ 4 files changed, 33 insertions(+) diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index 88fb2fb..319ed81 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -632,6 +632,8 @@ static const struct dev_pm_ops nhi_pm_ops = { * pci-tunnels stay alive. */ .restore_noirq = nhi_resume_noirq, + .runtime_suspend = nhi_suspend_noirq, + .runtime_resume = nhi_resume_noirq, }; static struct pci_device_id nhi_ids[] = { diff --git a/drivers/thunderbolt/power.c b/drivers/thunderbolt/power.c index 4d7c6a0..1b5f066 100644 --- a/drivers/thunderbolt/power.c +++ b/drivers/thunderbolt/power.c @@ -320,6 +320,12 @@ void thunderbolt_power_init(struct tb *tb) tb->power = power; + pm_runtime_allow(nhi_dev); + pm_runtime_set_autosuspend_delay(nhi_dev, 10000); + pm_runtime_use_autosuspend(nhi_dev); + pm_runtime_mark_last_busy(nhi_dev); + pm_runtime_put_autosuspend(nhi_dev); + return; err: @@ -336,6 +342,9 @@ void thunderbolt_power_fini(struct tb *tb) if (!power) return; + pm_runtime_get(nhi_dev); + pm_runtime_forbid(nhi_dev); + tb->power = NULL; dev_pm_domain_set(upstream_dev, NULL); diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c index c6f30b1..422fe6e 100644 --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -5,6 +5,7 @@ */ #include +#include #include #include "tb.h" @@ -326,6 +327,11 @@ void tb_switch_free(struct tb_switch *sw) if (!sw->is_unplugged) tb_plug_events_active(sw, false); + if (sw != sw->tb->root_switch) { + pm_runtime_mark_last_busy(&sw->tb->nhi->pdev->dev); + pm_runtime_put_autosuspend(&sw->tb->nhi->pdev->dev); + } + kfree(sw->ports); kfree(sw->drom); kfree(sw); @@ -420,6 +426,9 @@ struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route) if (tb_plug_events_active(sw, true)) goto err; + if (tb->root_switch) + pm_runtime_get(&tb->nhi->pdev->dev); + return sw; err: kfree(sw->ports); diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 24b6d30..a3fedf9 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -7,6 +7,7 @@ #include #include #include +#include #include "tb.h" #include "tb_regs.h" @@ -217,8 +218,11 @@ static void tb_handle_hotplug(struct work_struct *work) { struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); struct tb *tb = ev->tb; + struct device *dev = &tb->nhi->pdev->dev; struct tb_switch *sw; struct tb_port *port; + + pm_runtime_get(dev); mutex_lock(&tb->lock); if (!tb->hotplug_active) goto out; /* during init, suspend or shutdown */ @@ -274,6 +278,8 @@ static void tb_handle_hotplug(struct work_struct *work) out: mutex_unlock(&tb->lock); kfree(ev); + pm_runtime_mark_last_busy(dev); + pm_runtime_put_autosuspend(dev); } /** @@ -433,4 +439,11 @@ void thunderbolt_resume(struct tb *tb) tb->hotplug_active = true; mutex_unlock(&tb->lock); tb_info(tb, "resume finished\n"); + + /* + * If runtime resuming due to a hotplug event (rather than resuming + * from system sleep), wait for it to arrive. May take about 700 ms. + */ + if (tb->nhi->pdev->dev.power.runtime_status == RPM_RESUMING) + msleep(1000); }