From patchwork Sat Sep 7 22:16:38 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 273392 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 C438A2C0112 for ; Sun, 8 Sep 2013 08:05:59 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754036Ab3IGWFn (ORCPT ); Sat, 7 Sep 2013 18:05:43 -0400 Received: from hydra.sisk.pl ([212.160.235.94]:38193 "EHLO hydra.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751956Ab3IGWFm (ORCPT ); Sat, 7 Sep 2013 18:05:42 -0400 Received: from vostro.rjw.lan (afdh215.neoplus.adsl.tpnet.pl [95.49.85.215]) by hydra.sisk.pl (Postfix) with ESMTPSA id 44DF2E3DBB; Sat, 7 Sep 2013 23:59:45 +0200 (CEST) From: "Rafael J. Wysocki" To: Alex Williamson , ACPI Devel Maling List Cc: Bjorn Helgaas , LKML , Linux PCI , Yinghai Lu , Jiang Liu , Mika Westerberg , "Kirill A. Shutemov" Subject: [PATCH] ACPI / hotplug / PCI: Avoid parent bus rescans on spurious device checks Date: Sun, 08 Sep 2013 00:16:38 +0200 Message-ID: <2762291.l6lVgcWD3r@vostro.rjw.lan> User-Agent: KMail/4.10.5 (Linux/3.11.0-rc7+; KDE/4.10.5; x86_64; ; ) In-Reply-To: <1378481674.3246.288.camel@ul30vt.home> References: <26431283.HJCKsss0rt@vostro.rjw.lan> <1378481674.3246.288.camel@ul30vt.home> MIME-Version: 1.0 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Rafael J. Wysocki In the current ACPIPHP notify handler we always go directly for a rescan of the parent bus if we get a device check notification for a device that is not a bridge. However, this obviously is overzealous if nothing really changes, because this way we may rescan the whole PCI hierarchy pretty much in vain. That happens on Alex Williamson's machine whose ACPI tables contain device objects that are supposed to coresspond to PCIe root ports, but those ports aren't physically present (or at least they aren't visible in the PCI config space to us). The BIOS generates multiple device check notifies for those objects during boot and for each of them we go straight for the parent bus rescan, but the parent bus is the root bus in this particular case. In consequence, we rescan the whole PCI bus from the top several times in a row, which is completely unnecessary, increases boot time by 50% (after previous fixes) and generates excess dmesg output from the PCI subsystem. Fix the problem by checking if we can find anything new in the slot corresponding to the device we've got a device check notify for and doing nothig if that's not the case. The spec (ACPI 5.0, Section 5.6.6) appears to mandate this behavior, as it says: Device Check. Used to notify OSPM that the device either appeared or disappeared. If the device has appeared, OSPM will re-enumerate from the parent. If the device has disappeared, OSPM will invalidate the state of the device. OSPM may optimize out re-enumeration. Therefore, according to the spec, we are free to do nothing if nothing changes. References: https://bugzilla.kernel.org/show_bug.cgi?id=60865 Reported-by: Alex Williamson Signed-off-by: Rafael J. Wysocki Tested-by: Alex Williamson --- On top of linux-pm.git/linux-next. Thanks, Rafael --- drivers/pci/hotplug/acpiphp_glue.c | 32 +++++++++++++++++++++++++------- 1 file changed, 25 insertions(+), 7 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux-pm/drivers/pci/hotplug/acpiphp_glue.c =================================================================== --- linux-pm.orig/drivers/pci/hotplug/acpiphp_glue.c +++ linux-pm/drivers/pci/hotplug/acpiphp_glue.c @@ -528,6 +528,16 @@ static void check_hotplug_bridge(struct } } +static int acpiphp_rescan_slot(struct acpiphp_slot *slot) +{ + struct acpiphp_func *func; + + list_for_each_entry(func, &slot->funcs, sibling) + acpiphp_bus_add(func_to_handle(func)); + + return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0)); +} + /** * enable_slot - enable, configure a slot * @slot: slot to be enabled @@ -544,10 +554,7 @@ static void __ref enable_slot(struct acp LIST_HEAD(add_list); int nr_found; - list_for_each_entry(func, &slot->funcs, sibling) - acpiphp_bus_add(func_to_handle(func)); - - nr_found = pci_scan_slot(bus, PCI_DEVFN(slot->device, 0)); + nr_found = acpiphp_rescan_slot(slot); max = acpiphp_max_busnr(bus); for (pass = 0; pass < 2; pass++) { list_for_each_entry(dev, &bus->devices, bus_list) { @@ -840,11 +847,22 @@ static void hotplug_event(acpi_handle ha case ACPI_NOTIFY_DEVICE_CHECK: /* device check */ dbg("%s: Device check notify on %s\n", __func__, objname); - if (bridge) + if (bridge) { acpiphp_check_bridge(bridge); - else - acpiphp_check_bridge(func->parent); + } else { + struct acpiphp_slot *slot = func->slot; + int ret; + /* + * Check if anything has changed in the slot and rescan + * from the parent if that's the case. + */ + mutex_lock(&slot->crit_sect); + ret = acpiphp_rescan_slot(slot); + mutex_unlock(&slot->crit_sect); + if (ret) + acpiphp_check_bridge(func->parent); + } break; case ACPI_NOTIFY_EJECT_REQUEST: