From patchwork Tue Jan 7 23:37:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anchal Agarwal X-Patchwork-Id: 11322341 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DA3376C1 for ; Tue, 7 Jan 2020 23:37:33 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 96AAB20848 for ; Tue, 7 Jan 2020 23:37:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="PuTqZlWt" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 96AAB20848 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amazon.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 66BEC8E0006; 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Tue, 7 Jan 2020 23:37:26 +0000 (UTC) Received: from EX13D07UWB003.ant.amazon.com (10.43.161.66) by EX13MTAUWB001.ant.amazon.com (10.43.161.207) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:37:20 +0000 Received: from EX13MTAUWB001.ant.amazon.com (10.43.161.207) by EX13D07UWB003.ant.amazon.com (10.43.161.66) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:37:20 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.161.249) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 7 Jan 2020 23:37:20 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id 5ACFC40E65; Tue, 7 Jan 2020 23:37:20 +0000 (UTC) Date: Tue, 7 Jan 2020 23:37:20 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 01/11] xen/manage: keep track of the on-going suspend mode Message-ID: <20200107233720.GA17906@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Munehisa Kamata Guest hibernation is different from xen suspend/resume/live migration. Xen save/restore does not use pm_ops as is needed by guest hibernation. Hibernation in guest follows ACPI path and is guest inititated , the hibernation image is saved within guest as compared to later modes which are xen toolstack assisted and image creation/storage is in control of hypervisor/host machine. To differentiate between Xen suspend and PM hibernation, keep track of the on-going suspend mode by mainly using a new PM notifier. Introduce simple functions which help to know the on-going suspend mode so that other Xen-related code can behave differently according to the current suspend mode. Since Xen suspend doesn't have corresponding PM event, its main logic is modfied to acquire pm_mutex and set the current mode. Though, acquirng pm_mutex is still right thing to do, we may see deadlock if PM hibernation is interrupted by Xen suspend. PM hibernation depends on xenwatch thread to process xenbus state transactions, but the thread will sleep to wait pm_mutex which is already held by PM hibernation context in the scenario. Xen shutdown code may need some changes to avoid the issue. [Anchal Changelog: Merged patch xen/manage: introduce helper function to know the on-going suspend mode into this one for better readability] Signed-off-by: Anchal Agarwal Signed-off-by: Munehisa Kamata --- drivers/xen/manage.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/xen/xen-ops.h | 3 +++ 2 files changed, 76 insertions(+) diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c index cd046684e0d1..0b30ab522b77 100644 --- a/drivers/xen/manage.c +++ b/drivers/xen/manage.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -40,6 +41,31 @@ enum shutdown_state { /* Ignore multiple shutdown requests. */ static enum shutdown_state shutting_down = SHUTDOWN_INVALID; +enum suspend_modes { + NO_SUSPEND = 0, + XEN_SUSPEND, + PM_SUSPEND, + PM_HIBERNATION, +}; + +/* Protected by pm_mutex */ +static enum suspend_modes suspend_mode = NO_SUSPEND; + +bool xen_suspend_mode_is_xen_suspend(void) +{ + return suspend_mode == XEN_SUSPEND; +} + +bool xen_suspend_mode_is_pm_suspend(void) +{ + return suspend_mode == PM_SUSPEND; +} + +bool xen_suspend_mode_is_pm_hibernation(void) +{ + return suspend_mode == PM_HIBERNATION; +} + struct suspend_info { int cancelled; }; @@ -99,6 +125,10 @@ static void do_suspend(void) int err; struct suspend_info si; + lock_system_sleep(); + + suspend_mode = XEN_SUSPEND; + shutting_down = SHUTDOWN_SUSPEND; err = freeze_processes(); @@ -162,6 +192,10 @@ static void do_suspend(void) thaw_processes(); out: shutting_down = SHUTDOWN_INVALID; + + suspend_mode = NO_SUSPEND; + + unlock_system_sleep(); } #endif /* CONFIG_HIBERNATE_CALLBACKS */ @@ -387,3 +421,42 @@ int xen_setup_shutdown_event(void) EXPORT_SYMBOL_GPL(xen_setup_shutdown_event); subsys_initcall(xen_setup_shutdown_event); + +static int xen_pm_notifier(struct notifier_block *notifier, + unsigned long pm_event, void *unused) +{ + switch (pm_event) { + case PM_SUSPEND_PREPARE: + suspend_mode = PM_SUSPEND; + break; + case PM_HIBERNATION_PREPARE: + case PM_RESTORE_PREPARE: + suspend_mode = PM_HIBERNATION; + break; + case PM_POST_SUSPEND: + case PM_POST_RESTORE: + case PM_POST_HIBERNATION: + /* Set back to the default */ + suspend_mode = NO_SUSPEND; + break; + default: + pr_warn("Receive unknown PM event 0x%lx\n", pm_event); + return -EINVAL; + } + + return 0; +}; + +static struct notifier_block xen_pm_notifier_block = { + .notifier_call = xen_pm_notifier +}; + +static int xen_setup_pm_notifier(void) +{ + if (!xen_hvm_domain()) + return -ENODEV; + + return register_pm_notifier(&xen_pm_notifier_block); +} + +subsys_initcall(xen_setup_pm_notifier); diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h index d89969aa9942..6c36e161dfd1 100644 --- a/include/xen/xen-ops.h +++ b/include/xen/xen-ops.h @@ -40,6 +40,9 @@ u64 xen_steal_clock(int cpu); int xen_setup_shutdown_event(void); +bool xen_suspend_mode_is_xen_suspend(void); +bool xen_suspend_mode_is_pm_suspend(void); +bool xen_suspend_mode_is_pm_hibernation(void); extern unsigned long *xen_contiguous_bitmap; #if defined(CONFIG_XEN_PV) || defined(CONFIG_ARM) || defined(CONFIG_ARM64) From patchwork Tue Jan 7 23:39:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anchal Agarwal X-Patchwork-Id: 11322349 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 104806C1 for ; 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Tue, 7 Jan 2020 23:39:26 +0000 (UTC) Received: from EX13D08UEB004.ant.amazon.com (10.43.60.142) by EX13MTAUEB002.ant.amazon.com (10.43.60.12) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:39:06 +0000 Received: from EX13MTAUEB002.ant.amazon.com (10.43.60.12) by EX13D08UEB004.ant.amazon.com (10.43.60.142) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:39:06 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.60.234) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 7 Jan 2020 23:39:06 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id 417C040E65; Tue, 7 Jan 2020 23:39:06 +0000 (UTC) Date: Tue, 7 Jan 2020 23:39:06 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 02/11] xenbus: add freeze/thaw/restore callbacks support Message-ID: <20200107233906.GA18057@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Munehisa Kamata Since commit b3e96c0c7562 ("xen: use freeze/restore/thaw PM events for suspend/resume/chkpt"), xenbus uses PMSG_FREEZE, PMSG_THAW and PMSG_RESTORE events for Xen suspend. However, they're actually assigned to xenbus_dev_suspend(), xenbus_dev_cancel() and xenbus_dev_resume() respectively, and only suspend and resume callbacks are supported at driver level. To support PM suspend and PM hibernation, modify the bus level PM callbacks to invoke not only device driver's suspend/resume but also freeze/thaw/restore. Note that we'll use freeze/restore callbacks even for PM suspend whereas suspend/resume callbacks are normally used in the case, becausae the existing xenbus device drivers already have suspend/resume callbacks specifically designed for Xen suspend. So we can allow the device drivers to keep the existing callbacks wihtout modification. [Anchal Changelog: Refactored the callbacks code] Signed-off-by: Agarwal Anchal Signed-off-by: Munehisa Kamata --- drivers/xen/xenbus/xenbus_probe.c | 99 ++++++++++++++++++++++++++++++++------- include/xen/xenbus.h | 3 ++ 2 files changed, 84 insertions(+), 18 deletions(-) diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c index 5b471889d723..0fa8eeee68c2 100644 --- a/drivers/xen/xenbus/xenbus_probe.c +++ b/drivers/xen/xenbus/xenbus_probe.c @@ -49,6 +49,7 @@ #include #include #include +#include #include #include @@ -597,27 +598,44 @@ int xenbus_dev_suspend(struct device *dev) struct xenbus_driver *drv; struct xenbus_device *xdev = container_of(dev, struct xenbus_device, dev); - + bool xen_suspend = xen_suspend_mode_is_xen_suspend(); DPRINTK("%s", xdev->nodename); if (dev->driver == NULL) return 0; drv = to_xenbus_driver(dev->driver); - if (drv->suspend) - err = drv->suspend(xdev); - if (err) - pr_warn("suspend %s failed: %i\n", dev_name(dev), err); + + if (xen_suspend) { + if (drv->suspend) + err = drv->suspend(xdev); + } else { + if (drv->freeze) { + err = drv->freeze(xdev); + if (!err) { + free_otherend_watch(xdev); + free_otherend_details(xdev); + return 0; + } + } + } + + if (err) { + pr_warn("%s %s failed: %i\n", xen_suspend ? + "suspend" : "freeze", dev_name(dev), err); + return err; + } + return 0; } EXPORT_SYMBOL_GPL(xenbus_dev_suspend); int xenbus_dev_resume(struct device *dev) { - int err; + int err = 0; struct xenbus_driver *drv; struct xenbus_device *xdev = container_of(dev, struct xenbus_device, dev); - + bool xen_suspend = xen_suspend_mode_is_xen_suspend(); DPRINTK("%s", xdev->nodename); if (dev->driver == NULL) @@ -625,24 +643,32 @@ int xenbus_dev_resume(struct device *dev) drv = to_xenbus_driver(dev->driver); err = talk_to_otherend(xdev); if (err) { - pr_warn("resume (talk_to_otherend) %s failed: %i\n", + pr_warn("%s (talk_to_otherend) %s failed: %i\n", + xen_suspend ? "resume" : "restore", dev_name(dev), err); return err; } - xdev->state = XenbusStateInitialising; + if (xen_suspend) { + xdev->state = XenbusStateInitialising; + if (drv->resume) + err = drv->resume(xdev); + } else { + if (drv->restore) + err = drv->restore(xdev); + } - if (drv->resume) { - err = drv->resume(xdev); - if (err) { - pr_warn("resume %s failed: %i\n", dev_name(dev), err); - return err; - } + if (err) { + pr_warn("%s %s failed: %i\n", + xen_suspend ? "resume" : "restore", + dev_name(dev), err); + return err; } err = watch_otherend(xdev); if (err) { - pr_warn("resume (watch_otherend) %s failed: %d.\n", + pr_warn("%s (watch_otherend) %s failed: %d.\n", + xen_suspend ? "resume" : "restore", dev_name(dev), err); return err; } @@ -653,8 +679,45 @@ EXPORT_SYMBOL_GPL(xenbus_dev_resume); int xenbus_dev_cancel(struct device *dev) { - /* Do nothing */ - DPRINTK("cancel"); + int err = 0; + struct xenbus_driver *drv; + struct xenbus_device *xdev + = container_of(dev, struct xenbus_device, dev); + bool xen_suspend = xen_suspend_mode_is_xen_suspend(); + + if (xen_suspend) { + /* Do nothing */ + DPRINTK("cancel"); + return 0; + } + + DPRINTK("%s", xdev->nodename); + + if (dev->driver == NULL) + return 0; + drv = to_xenbus_driver(dev->driver); + err = talk_to_otherend(xdev); + if (err) { + pr_warn("thaw (talk_to_otherend) %s failed: %d.\n", + dev_name(dev), err); + return err; + } + + if (drv->thaw) { + err = drv->thaw(xdev); + if (err) { + pr_warn("thaw %s failed: %i\n", dev_name(dev), err); + return err; + } + } + + err = watch_otherend(xdev); + if (err) { + pr_warn("thaw (watch_otherend) %s failed: %d.\n", + dev_name(dev), err); + return err; + } + return 0; } EXPORT_SYMBOL_GPL(xenbus_dev_cancel); diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h index 869c816d5f8c..20261d5f4e78 100644 --- a/include/xen/xenbus.h +++ b/include/xen/xenbus.h @@ -100,6 +100,9 @@ struct xenbus_driver { int (*remove)(struct xenbus_device *dev); int (*suspend)(struct xenbus_device *dev); int (*resume)(struct xenbus_device *dev); + int (*freeze)(struct xenbus_device *dev); + int (*thaw)(struct xenbus_device *dev); + int (*restore)(struct xenbus_device *dev); int (*uevent)(struct xenbus_device *, struct kobj_uevent_env *); struct device_driver driver; int (*read_otherend_details)(struct xenbus_device *dev); From patchwork Tue Jan 7 23:39:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anchal Agarwal X-Patchwork-Id: 11322355 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0DF0B6C1 for ; Tue, 7 Jan 2020 23:40:23 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C42AA24676 for ; 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Tue, 7 Jan 2020 23:40:07 +0000 (UTC) Received: from EX13D08UEB003.ant.amazon.com (10.43.60.11) by EX13MTAUEB002.ant.amazon.com (10.43.60.12) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:39:47 +0000 Received: from EX13MTAUEA002.ant.amazon.com (10.43.61.77) by EX13D08UEB003.ant.amazon.com (10.43.60.11) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:39:47 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.61.169) with Microsoft SMTP Server id 15.0.1236.3 via Frontend Transport; Tue, 7 Jan 2020 23:39:47 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id E3FD440E65; Tue, 7 Jan 2020 23:39:46 +0000 (UTC) Date: Tue, 7 Jan 2020 23:39:46 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 03/11] x86/xen: Introduce new function to map Message-ID: <20200107233946.GA18143@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Introduce a small function which re-uses shared page's PA allocated during guest initialization time in reserve_shared_info() and not allocate new page during resume flow. It also does the mapping of shared_info_page by calling xen_hvm_init_shared_info() to use the function. Signed-off-by: Anchal Agarwal --- arch/x86/xen/enlighten_hvm.c | 7 +++++++ arch/x86/xen/xen-ops.h | 1 + 2 files changed, 8 insertions(+) diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c index e138f7de52d2..75b1ec7a0fcd 100644 --- a/arch/x86/xen/enlighten_hvm.c +++ b/arch/x86/xen/enlighten_hvm.c @@ -27,6 +27,13 @@ static unsigned long shared_info_pfn; +void xen_hvm_map_shared_info(void) +{ + xen_hvm_init_shared_info(); + if (shared_info_pfn) + HYPERVISOR_shared_info = __va(PFN_PHYS(shared_info_pfn)); +} + void xen_hvm_init_shared_info(void) { struct xen_add_to_physmap xatp; diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h index 45a441c33d6d..d84c357994bd 100644 --- a/arch/x86/xen/xen-ops.h +++ b/arch/x86/xen/xen-ops.h @@ -56,6 +56,7 @@ void xen_enable_syscall(void); void xen_vcpu_restore(void); void xen_callback_vector(void); +void xen_hvm_map_shared_info(void); void xen_hvm_init_shared_info(void); void xen_unplug_emulated_devices(void); From patchwork Tue Jan 7 23:40:38 2020 Content-Type: text/plain; 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Tue, 7 Jan 2020 23:40:55 +0000 (UTC) Received: from EX13D08UEB002.ant.amazon.com (10.43.60.107) by EX13MTAUEB002.ant.amazon.com (10.43.60.12) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:40:39 +0000 Received: from EX13MTAUEB002.ant.amazon.com (10.43.60.12) by EX13D08UEB002.ant.amazon.com (10.43.60.107) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:40:38 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.60.234) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 7 Jan 2020 23:40:38 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id 4B11640E65; Tue, 7 Jan 2020 23:40:38 +0000 (UTC) Date: Tue, 7 Jan 2020 23:40:38 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 04/11] x86/xen: add system core suspend and resume callbacks Message-ID: <20200107234038.GA18296@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Munehisa Kamata Add Xen PVHVM specific system core callbacks for PM suspend and hibernation support. The callbacks suspend and resume Xen primitives,like shared_info, pvclock and grant table. Note that Xen suspend can handle them in a different manner, but system core callbacks are called from the context. So if the callbacks are called from Xen suspend context, return immediately. Signed-off-by: Agarwal Anchal Signed-off-by: Munehisa Kamata --- arch/x86/xen/enlighten_hvm.c | 1 + arch/x86/xen/suspend.c | 53 ++++++++++++++++++++++++++++++++++++++++++++ include/xen/xen-ops.h | 3 +++ 3 files changed, 57 insertions(+) diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c index 75b1ec7a0fcd..138e71786e03 100644 --- a/arch/x86/xen/enlighten_hvm.c +++ b/arch/x86/xen/enlighten_hvm.c @@ -204,6 +204,7 @@ static void __init xen_hvm_guest_init(void) if (xen_feature(XENFEAT_hvm_callback_vector)) xen_have_vector_callback = 1; + xen_setup_syscore_ops(); xen_hvm_smp_init(); WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_hvm, xen_cpu_dead_hvm)); xen_unplug_emulated_devices(); diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c index 1d83152c761b..784c4484100b 100644 --- a/arch/x86/xen/suspend.c +++ b/arch/x86/xen/suspend.c @@ -2,17 +2,22 @@ #include #include #include +#include +#include #include #include +#include #include #include +#include #include #include #include #include #include +#include #include "xen-ops.h" #include "mmu.h" @@ -82,3 +87,51 @@ void xen_arch_suspend(void) on_each_cpu(xen_vcpu_notify_suspend, NULL, 1); } + +static int xen_syscore_suspend(void) +{ + struct xen_remove_from_physmap xrfp; + int ret; + + /* Xen suspend does similar stuffs in its own logic */ + if (xen_suspend_mode_is_xen_suspend()) + return 0; + + xrfp.domid = DOMID_SELF; + xrfp.gpfn = __pa(HYPERVISOR_shared_info) >> PAGE_SHIFT; + + ret = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, &xrfp); + if (!ret) + HYPERVISOR_shared_info = &xen_dummy_shared_info; + + return ret; +} + +static void xen_syscore_resume(void) +{ + /* Xen suspend does similar stuffs in its own logic */ + if (xen_suspend_mode_is_xen_suspend()) + return; + + /* No need to setup vcpu_info as it's already moved off */ + xen_hvm_map_shared_info(); + + pvclock_resume(); + + gnttab_resume(); +} + +/* + * These callbacks will be called with interrupts disabled and when having only + * one CPU online. + */ +static struct syscore_ops xen_hvm_syscore_ops = { + .suspend = xen_syscore_suspend, + .resume = xen_syscore_resume +}; + +void __init xen_setup_syscore_ops(void) +{ + if (xen_hvm_domain()) + register_syscore_ops(&xen_hvm_syscore_ops); +} diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h index 6c36e161dfd1..3b3992b5b0c2 100644 --- a/include/xen/xen-ops.h +++ b/include/xen/xen-ops.h @@ -43,6 +43,9 @@ int xen_setup_shutdown_event(void); bool xen_suspend_mode_is_xen_suspend(void); bool xen_suspend_mode_is_pm_suspend(void); bool xen_suspend_mode_is_pm_hibernation(void); + +void xen_setup_syscore_ops(void); + extern unsigned long *xen_contiguous_bitmap; #if defined(CONFIG_XEN_PV) || defined(CONFIG_ARM) || defined(CONFIG_ARM64) From patchwork Tue Jan 7 23:41:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anchal Agarwal X-Patchwork-Id: 11322363 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D7392138D for ; Tue, 7 Jan 2020 23:41:40 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 952602080A for ; 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Tue, 7 Jan 2020 23:41:26 +0000 (UTC) Received: from EX13D07UWB002.ant.amazon.com (10.43.161.131) by EX13MTAUWB001.ant.amazon.com (10.43.161.249) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:41:21 +0000 Received: from EX13MTAUWB001.ant.amazon.com (10.43.161.207) by EX13D07UWB002.ant.amazon.com (10.43.161.131) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:41:21 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.161.249) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 7 Jan 2020 23:41:21 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id 7E4B640E65; Tue, 7 Jan 2020 23:41:21 +0000 (UTC) Date: Tue, 7 Jan 2020 23:41:21 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 05/11] xen-netfront: add callbacks for PM suspend and hibernation support Message-ID: <20200107234121.GA18336@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Munehisa Kamata Add freeze, thaw and restore callbacks for PM suspend and hibernation support. The freeze handler simply disconnects the frotnend from the backend and frees resources associated with queues after disabling the net_device from the system. The restore handler just changes the frontend state and let the xenbus handler to re-allocate the resources and re-connect to the backend. This can be performed transparently to the rest of the system. The handlers are used for both PM suspend and hibernation so that we can keep the existing suspend/resume callbacks for Xen suspend without modification. Freezing netfront devices is normally expected to finish within a few hundred milliseconds, but it can rarely take more than 5 seconds and hit the hard coded timeout, it would depend on backend state which may be congested and/or have complex configuration. While it's rare case, longer default timeout seems a bit more reasonable here to avoid hitting the timeout. Also, make it configurable via module parameter so that we can cover broader setups than what we know currently. [Anchal changelog: Variable name fix and checkpatch.pl fixes] Signed-off-by: Anchal Agarwal Signed-off-by: Munehisa Kamata --- drivers/net/xen-netfront.c | 98 +++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 97 insertions(+), 1 deletion(-) diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index 467fd0f0ffcd..aa7ef40378ca 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -43,6 +43,7 @@ #include #include #include +#include #include #include @@ -56,6 +57,12 @@ #include #include +enum netif_freeze_state { + NETIF_FREEZE_STATE_UNFROZEN, + NETIF_FREEZE_STATE_FREEZING, + NETIF_FREEZE_STATE_FROZEN, +}; + /* Module parameters */ #define MAX_QUEUES_DEFAULT 8 static unsigned int xennet_max_queues; @@ -63,6 +70,12 @@ module_param_named(max_queues, xennet_max_queues, uint, 0644); MODULE_PARM_DESC(max_queues, "Maximum number of queues per virtual interface"); +static unsigned int netfront_freeze_timeout_secs = 10; +module_param_named(freeze_timeout_secs, + netfront_freeze_timeout_secs, uint, 0644); +MODULE_PARM_DESC(freeze_timeout_secs, + "timeout when freezing netfront device in seconds"); + static const struct ethtool_ops xennet_ethtool_ops; struct netfront_cb { @@ -160,6 +173,10 @@ struct netfront_info { struct netfront_stats __percpu *tx_stats; atomic_t rx_gso_checksum_fixup; + + int freeze_state; + + struct completion wait_backend_disconnected; }; struct netfront_rx_info { @@ -721,6 +738,21 @@ static int xennet_close(struct net_device *dev) return 0; } +static int xennet_disable_interrupts(struct net_device *dev) +{ + struct netfront_info *np = netdev_priv(dev); + unsigned int num_queues = dev->real_num_tx_queues; + unsigned int queue_index; + struct netfront_queue *queue; + + for (queue_index = 0; queue_index < num_queues; ++queue_index) { + queue = &np->queues[queue_index]; + disable_irq(queue->tx_irq); + disable_irq(queue->rx_irq); + } + return 0; +} + static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb, grant_ref_t ref) { @@ -1301,6 +1333,8 @@ static struct net_device *xennet_create_dev(struct xenbus_device *dev) np->queues = NULL; + init_completion(&np->wait_backend_disconnected); + err = -ENOMEM; np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); if (np->rx_stats == NULL) @@ -1794,6 +1828,50 @@ static int xennet_create_queues(struct netfront_info *info, return 0; } +static int netfront_freeze(struct xenbus_device *dev) +{ + struct netfront_info *info = dev_get_drvdata(&dev->dev); + unsigned long timeout = netfront_freeze_timeout_secs * HZ; + int err = 0; + + xennet_disable_interrupts(info->netdev); + + netif_device_detach(info->netdev); + + info->freeze_state = NETIF_FREEZE_STATE_FREEZING; + + /* Kick the backend to disconnect */ + xenbus_switch_state(dev, XenbusStateClosing); + + /* We don't want to move forward before the frontend is diconnected + * from the backend cleanly. + */ + timeout = wait_for_completion_timeout(&info->wait_backend_disconnected, + timeout); + if (!timeout) { + err = -EBUSY; + xenbus_dev_error(dev, err, "Freezing timed out;" + "the device may become inconsistent state"); + return err; + } + + /* Tear down queues */ + xennet_disconnect_backend(info); + xennet_destroy_queues(info); + + info->freeze_state = NETIF_FREEZE_STATE_FROZEN; + + return err; +} + +static int netfront_restore(struct xenbus_device *dev) +{ + /* Kick the backend to re-connect */ + xenbus_switch_state(dev, XenbusStateInitialising); + + return 0; +} + /* Common code used when first setting up, and when resuming. */ static int talk_to_netback(struct xenbus_device *dev, struct netfront_info *info) @@ -2006,6 +2084,8 @@ static int xennet_connect(struct net_device *dev) spin_unlock_bh(&queue->rx_lock); } + np->freeze_state = NETIF_FREEZE_STATE_UNFROZEN; + return 0; } @@ -2043,10 +2123,23 @@ static void netback_changed(struct xenbus_device *dev, break; case XenbusStateClosed: - if (dev->state == XenbusStateClosed) + if (dev->state == XenbusStateClosed) { + /* dpm context is waiting for the backend */ + if (np->freeze_state == NETIF_FREEZE_STATE_FREEZING) + complete(&np->wait_backend_disconnected); break; + } + /* Fall through - Missed the backend's CLOSING state. */ case XenbusStateClosing: + /* We may see unexpected Closed or Closing from the backend. + * Just ignore it not to prevent the frontend from being + * re-connected in the case of PM suspend or hibernation. + */ + if (np->freeze_state == NETIF_FREEZE_STATE_FROZEN && + dev->state == XenbusStateInitialising) { + break; + } xenbus_frontend_closed(dev); break; } @@ -2193,6 +2286,9 @@ static struct xenbus_driver netfront_driver = { .probe = netfront_probe, .remove = xennet_remove, .resume = netfront_resume, + .freeze = netfront_freeze, + .thaw = netfront_restore, + .restore = netfront_restore, .otherend_changed = netback_changed, }; From patchwork Tue Jan 7 23:42:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anchal Agarwal X-Patchwork-Id: 11322371 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 802826C1 for ; 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Tue, 7 Jan 2020 23:42:44 +0000 (UTC) Received: from EX13D08UEE002.ant.amazon.com (10.43.62.92) by EX13MTAUEE002.ant.amazon.com (10.43.62.24) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:42:23 +0000 Received: from EX13MTAUEA001.ant.amazon.com (10.43.61.82) by EX13D08UEE002.ant.amazon.com (10.43.62.92) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:42:23 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.61.243) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 7 Jan 2020 23:42:23 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id 9A4CE40E65; Tue, 7 Jan 2020 23:42:23 +0000 (UTC) Date: Tue, 7 Jan 2020 23:42:23 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 06/11] xen-blkfront: add callbacks for PM suspend and hibernation Message-ID: <20200107234223.GA18539@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Munehisa Kamata Add freeze, thaw and restore callbacks for PM suspend and hibernation support. All frontend drivers that needs to use PM_HIBERNATION/PM_SUSPEND events, need to implement these xenbus_driver callbacks. The freeze handler stops a block-layer queue and disconnect the frontend from the backend while freeing ring_info and associated resources. The restore handler re-allocates ring_info and re-connect to the backend, so the rest of the kernel can continue to use the block device transparently. Also, the handlers are used for both PM suspend and hibernation so that we can keep the existing suspend/resume callbacks for Xen suspend without modification. Before disconnecting from backend, we need to prevent any new IO from being queued and wait for existing IO to complete. Freeze/unfreeze of the queues will guarantee that there are no requests in use on the shared ring. Note:For older backends,if a backend doesn't have commit'12ea729645ace' xen/blkback: unmap all persistent grants when frontend gets disconnected, the frontend may see massive amount of grant table warning when freeing resources. [ 36.852659] deferring g.e. 0xf9 (pfn 0xffffffffffffffff) [ 36.855089] xen:grant_table: WARNING:e.g. 0x112 still in use! In this case, persistent grants would need to be disabled. [Anchal Changelog: Removed timeout/request during blkfront freeze. Fixed major part of the code to work with blk-mq] Signed-off-by: Anchal Agarwal Signed-off-by: Munehisa Kamata --- drivers/block/xen-blkfront.c | 119 ++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 112 insertions(+), 7 deletions(-) diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index a74d03913822..b1d38ca4600f 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -47,6 +47,8 @@ #include #include #include +#include +#include #include #include @@ -79,6 +81,8 @@ enum blkif_state { BLKIF_STATE_DISCONNECTED, BLKIF_STATE_CONNECTED, BLKIF_STATE_SUSPENDED, + BLKIF_STATE_FREEZING, + BLKIF_STATE_FROZEN }; struct grant { @@ -220,6 +224,7 @@ struct blkfront_info struct list_head requests; struct bio_list bio_list; struct list_head info_list; + struct completion wait_backend_disconnected; }; static unsigned int nr_minors; @@ -261,6 +266,7 @@ static DEFINE_SPINLOCK(minor_lock); static int blkfront_setup_indirect(struct blkfront_ring_info *rinfo); static void blkfront_gather_backend_features(struct blkfront_info *info); static int negotiate_mq(struct blkfront_info *info); +static void __blkif_free(struct blkfront_info *info); static int get_id_from_freelist(struct blkfront_ring_info *rinfo) { @@ -995,6 +1001,7 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size, info->sector_size = sector_size; info->physical_sector_size = physical_sector_size; blkif_set_queue_limits(info); + init_completion(&info->wait_backend_disconnected); return 0; } @@ -1218,6 +1225,8 @@ static void xlvbd_release_gendisk(struct blkfront_info *info) /* Already hold rinfo->ring_lock. */ static inline void kick_pending_request_queues_locked(struct blkfront_ring_info *rinfo) { + if (unlikely(rinfo->dev_info->connected == BLKIF_STATE_FREEZING)) + return; if (!RING_FULL(&rinfo->ring)) blk_mq_start_stopped_hw_queues(rinfo->dev_info->rq, true); } @@ -1341,8 +1350,6 @@ static void blkif_free_ring(struct blkfront_ring_info *rinfo) static void blkif_free(struct blkfront_info *info, int suspend) { - unsigned int i; - /* Prevent new requests being issued until we fix things up. */ info->connected = suspend ? BLKIF_STATE_SUSPENDED : BLKIF_STATE_DISCONNECTED; @@ -1350,6 +1357,13 @@ static void blkif_free(struct blkfront_info *info, int suspend) if (info->rq) blk_mq_stop_hw_queues(info->rq); + __blkif_free(info); +} + +static void __blkif_free(struct blkfront_info *info) +{ + unsigned int i; + for (i = 0; i < info->nr_rings; i++) blkif_free_ring(&info->rinfo[i]); @@ -1553,8 +1567,10 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id) struct blkfront_ring_info *rinfo = (struct blkfront_ring_info *)dev_id; struct blkfront_info *info = rinfo->dev_info; - if (unlikely(info->connected != BLKIF_STATE_CONNECTED)) - return IRQ_HANDLED; + if (unlikely(info->connected != BLKIF_STATE_CONNECTED)) { + if (info->connected != BLKIF_STATE_FREEZING) + return IRQ_HANDLED; + } spin_lock_irqsave(&rinfo->ring_lock, flags); again: @@ -2020,6 +2036,7 @@ static int blkif_recover(struct blkfront_info *info) struct bio *bio; unsigned int segs; + bool frozen = info->connected == BLKIF_STATE_FROZEN; blkfront_gather_backend_features(info); /* Reset limits changed by blk_mq_update_nr_hw_queues(). */ blkif_set_queue_limits(info); @@ -2046,6 +2063,9 @@ static int blkif_recover(struct blkfront_info *info) kick_pending_request_queues(rinfo); } + if (frozen) + return 0; + list_for_each_entry_safe(req, n, &info->requests, queuelist) { /* Requeue pending requests (flush or discard) */ list_del_init(&req->queuelist); @@ -2359,6 +2379,7 @@ static void blkfront_connect(struct blkfront_info *info) return; case BLKIF_STATE_SUSPENDED: + case BLKIF_STATE_FROZEN: /* * If we are recovering from suspension, we need to wait * for the backend to announce it's features before @@ -2476,12 +2497,37 @@ static void blkback_changed(struct xenbus_device *dev, break; case XenbusStateClosed: - if (dev->state == XenbusStateClosed) + if (dev->state == XenbusStateClosed) { + if (info->connected == BLKIF_STATE_FREEZING) { + __blkif_free(info); + info->connected = BLKIF_STATE_FROZEN; + complete(&info->wait_backend_disconnected); + break; + } + break; + } + + /* + * We may somehow receive backend's Closed again while thawing + * or restoring and it causes thawing or restoring to fail. + * Ignore such unexpected state anyway. + */ + if (info->connected == BLKIF_STATE_FROZEN && + dev->state == XenbusStateInitialised) { + dev_dbg(&dev->dev, + "ignore the backend's Closed state: %s", + dev->nodename); + break; + } /* fall through */ case XenbusStateClosing: - if (info) - blkfront_closing(info); + if (info) { + if (info->connected == BLKIF_STATE_FREEZING) + xenbus_frontend_closed(dev); + else + blkfront_closing(info); + } break; } } @@ -2625,6 +2671,62 @@ static void blkif_release(struct gendisk *disk, fmode_t mode) mutex_unlock(&blkfront_mutex); } +static int blkfront_freeze(struct xenbus_device *dev) +{ + unsigned int i; + struct blkfront_info *info = dev_get_drvdata(&dev->dev); + struct blkfront_ring_info *rinfo; + /* This would be reasonable timeout as used in xenbus_dev_shutdown() */ + unsigned int timeout = 5 * HZ; + int err = 0; + + info->connected = BLKIF_STATE_FREEZING; + + blk_mq_freeze_queue(info->rq); + blk_mq_quiesce_queue(info->rq); + + for (i = 0; i < info->nr_rings; i++) { + rinfo = &info->rinfo[i]; + + gnttab_cancel_free_callback(&rinfo->callback); + flush_work(&rinfo->work); + } + + /* Kick the backend to disconnect */ + xenbus_switch_state(dev, XenbusStateClosing); + + /* + * We don't want to move forward before the frontend is diconnected + * from the backend cleanly. + */ + timeout = wait_for_completion_timeout(&info->wait_backend_disconnected, + timeout); + if (!timeout) { + err = -EBUSY; + xenbus_dev_error(dev, err, "Freezing timed out;" + "the device may become inconsistent state"); + } + + return err; +} + +static int blkfront_restore(struct xenbus_device *dev) +{ + struct blkfront_info *info = dev_get_drvdata(&dev->dev); + int err = 0; + + err = talk_to_blkback(dev, info); + blk_mq_unquiesce_queue(info->rq); + blk_mq_unfreeze_queue(info->rq); + + if (err) + goto out; + blk_mq_update_nr_hw_queues(&info->tag_set, info->nr_rings); + +out: + return err; +} + static const struct block_device_operations xlvbd_block_fops = { .owner = THIS_MODULE, @@ -2647,6 +2749,9 @@ static struct xenbus_driver blkfront_driver = { .resume = blkfront_resume, .otherend_changed = blkback_changed, .is_ready = blkfront_is_ready, + .freeze = blkfront_freeze, + .thaw = blkfront_restore, + .restore = blkfront_restore }; static void purge_persistent_grants(struct blkfront_info *info) From patchwork Tue Jan 7 23:43:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anchal Agarwal X-Patchwork-Id: 11322379 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AB9F4138D for ; Tue, 7 Jan 2020 23:43:36 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6A819222D9 for ; Tue, 7 Jan 2020 23:43:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="vFyaKuFv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6A819222D9 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amazon.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A5EA98E0009; 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Tue, 7 Jan 2020 23:43:24 +0000 (UTC) Received: from EX13D08UEE002.ant.amazon.com (10.43.62.92) by EX13MTAUEE002.ant.amazon.com (10.43.62.24) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:43:06 +0000 Received: from EX13MTAUEA002.ant.amazon.com (10.43.61.77) by EX13D08UEE002.ant.amazon.com (10.43.62.92) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:43:06 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.61.169) with Microsoft SMTP Server id 15.0.1236.3 via Frontend Transport; Tue, 7 Jan 2020 23:43:06 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id 0A80440E65; Tue, 7 Jan 2020 23:43:06 +0000 (UTC) Date: Tue, 7 Jan 2020 23:43:06 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 07/11] x86/xen: save and restore steal clock during hibernation Message-ID: <20200107234306.GA18610@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Munehisa Kamata Currently, steal time accounting code in scheduler expects steal clock callback to provide monotonically increasing value. If the accounting code receives a smaller value than previous one, it uses a negative value to calculate steal time and results in incorrectly updated idle and steal time accounting. This breaks userspace tools which read /proc/stat. top - 08:05:35 up 2:12, 3 users, load average: 0.00, 0.07, 0.23 Tasks: 80 total, 1 running, 79 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,30100.0%id, 0.0%wa, 0.0%hi, 0.0%si, -1253874204672.0%st This can actually happen when a Xen PVHVM guest gets restored from hibernation, because such a restored guest is just a fresh domain from Xen perspective and the time information in runstate info starts over from scratch. Introduce xen_save_steal_clock() which saves current steal clock values of all present CPUs in runstate info into per-cpu variables during system core ops suspend callbacks. Its couterpart, xen_restore_steal_clock(), restores a boot CPU's steal clock in the system core resume callback. It sets offset if it found the current values in runstate info are smaller than previous ones. xen_steal_clock() is also modified to use the offset to ensure that scheduler only sees monotonically increasing number. For non-boot CPUs, restore after they're brought up, because runstate info for non-boot CPUs are not active until then. [Anchal Changelog: Merged patch xen/time: introduce xen_{save,restore}_steal_clock with this one for better code readability] Signed-off-by: Anchal Agarwal Signed-off-by: Munehisa Kamata --- arch/x86/xen/suspend.c | 13 ++++++++++++- arch/x86/xen/time.c | 3 +++ drivers/xen/time.c | 28 +++++++++++++++++++++++++++- include/xen/xen-ops.h | 2 ++ 4 files changed, 44 insertions(+), 2 deletions(-) diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c index 784c4484100b..dae0f74f5390 100644 --- a/arch/x86/xen/suspend.c +++ b/arch/x86/xen/suspend.c @@ -91,12 +91,20 @@ void xen_arch_suspend(void) static int xen_syscore_suspend(void) { struct xen_remove_from_physmap xrfp; - int ret; + int cpu, ret; /* Xen suspend does similar stuffs in its own logic */ if (xen_suspend_mode_is_xen_suspend()) return 0; + for_each_present_cpu(cpu) { + /* + * Nonboot CPUs are already offline, but the last copy of + * runstate info is still accessible. + */ + xen_save_steal_clock(cpu); + } + xrfp.domid = DOMID_SELF; xrfp.gpfn = __pa(HYPERVISOR_shared_info) >> PAGE_SHIFT; @@ -118,6 +126,9 @@ static void xen_syscore_resume(void) pvclock_resume(); + /* Nonboot CPUs will be resumed when they're brought up */ + xen_restore_steal_clock(smp_processor_id()); + gnttab_resume(); } diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c index befbdd8b17f0..8cf632dda605 100644 --- a/arch/x86/xen/time.c +++ b/arch/x86/xen/time.c @@ -537,6 +537,9 @@ static void xen_hvm_setup_cpu_clockevents(void) { int cpu = smp_processor_id(); xen_setup_runstate_info(cpu); + if (cpu) + xen_restore_steal_clock(cpu); + /* * xen_setup_timer(cpu) - snprintf is bad in atomic context. Hence * doing it xen_hvm_cpu_notify (which gets called by smp_init during diff --git a/drivers/xen/time.c b/drivers/xen/time.c index 0968859c29d0..3713d716070c 100644 --- a/drivers/xen/time.c +++ b/drivers/xen/time.c @@ -20,6 +20,8 @@ /* runstate info updated by Xen */ static DEFINE_PER_CPU(struct vcpu_runstate_info, xen_runstate); +static DEFINE_PER_CPU(u64, xen_prev_steal_clock); +static DEFINE_PER_CPU(u64, xen_steal_clock_offset); static DEFINE_PER_CPU(u64[4], old_runstate_time); @@ -149,7 +151,7 @@ bool xen_vcpu_stolen(int vcpu) return per_cpu(xen_runstate, vcpu).state == RUNSTATE_runnable; } -u64 xen_steal_clock(int cpu) +static u64 __xen_steal_clock(int cpu) { struct vcpu_runstate_info state; @@ -157,6 +159,30 @@ u64 xen_steal_clock(int cpu) return state.time[RUNSTATE_runnable] + state.time[RUNSTATE_offline]; } +u64 xen_steal_clock(int cpu) +{ + return __xen_steal_clock(cpu) + per_cpu(xen_steal_clock_offset, cpu); +} + +void xen_save_steal_clock(int cpu) +{ + per_cpu(xen_prev_steal_clock, cpu) = xen_steal_clock(cpu); +} + +void xen_restore_steal_clock(int cpu) +{ + u64 steal_clock = __xen_steal_clock(cpu); + + if (per_cpu(xen_prev_steal_clock, cpu) > steal_clock) { + /* Need to update the offset */ + per_cpu(xen_steal_clock_offset, cpu) = + per_cpu(xen_prev_steal_clock, cpu) - steal_clock; + } else { + /* Avoid unnecessary steal clock warp */ + per_cpu(xen_steal_clock_offset, cpu) = 0; + } +} + void xen_setup_runstate_info(int cpu) { struct vcpu_register_runstate_memory_area area; diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h index 3b3992b5b0c2..12b3f4474a05 100644 --- a/include/xen/xen-ops.h +++ b/include/xen/xen-ops.h @@ -37,6 +37,8 @@ void xen_time_setup_guest(void); void xen_manage_runstate_time(int action); void xen_get_runstate_snapshot(struct vcpu_runstate_info *res); u64 xen_steal_clock(int cpu); +void xen_save_steal_clock(int cpu); +void xen_restore_steal_clock(int cpu); int xen_setup_shutdown_event(void); From patchwork Tue Jan 7 23:43:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anchal Agarwal X-Patchwork-Id: 11322383 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 20CAF138C for ; 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Tue, 7 Jan 2020 23:44:09 +0000 (UTC) Received: from EX13D05UWC002.ant.amazon.com (10.43.162.92) by EX13MTAUWC001.ant.amazon.com (10.43.162.135) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:43:47 +0000 Received: from EX13MTAUWC001.ant.amazon.com (10.43.162.135) by EX13D05UWC002.ant.amazon.com (10.43.162.92) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:43:47 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.162.232) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 7 Jan 2020 23:43:47 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id B359440E65; Tue, 7 Jan 2020 23:43:47 +0000 (UTC) Date: Tue, 7 Jan 2020 23:43:47 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 08/11] x86/xen: close event channels for PIRQs in system core suspend callback Message-ID: <20200107234347.GA18699@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Munehisa Kamata There are no pm handlers for the legacy devices, so during tear down stale event channel <> IRQ mapping may still remain in the image and resume may fail. To avoid adding much code by implementing handlers for legacy devices, add a simple helper function to "shutdown" active PIRQs, which actually closes event channels but keeps related IRQ structures intact. PM suspend/hibernation code will rely on this. Close event channels allocated for devices which are backed by PIRQ and still active when suspending the system core. Normally, the devices are emulated legacy devices, e.g. PS/2 keyboard, floppy controller and etc. Without this, in PM hibernation, information about the event channel remains in hibernation image, but there is no guarantee that the same event channel numbers are assigned to the devices when restoring the system. This may cause conflict like the following and prevent some devices from being restored correctly. [ 102.330821] ------------[ cut here ]------------ [ 102.333264] WARNING: CPU: 0 PID: 2324 at drivers/xen/events/events_base.c:878 bind_evtchn_to_irq+0x88/0xf0 ... [ 102.348057] Call Trace: [ 102.348057] [] dump_stack+0x63/0x84 [ 102.348057] [] __warn+0xd1/0xf0 [ 102.348057] [] warn_slowpath_null+0x1d/0x20 [ 102.348057] [] bind_evtchn_to_irq+0x88/0xf0 [ 102.348057] [] ? blkif_copy_from_grant+0xb0/0xb0 [xen_blkfront] [ 102.348057] [] bind_evtchn_to_irqhandler+0x27/0x80 [ 102.348057] [] talk_to_blkback+0x425/0xcd0 [xen_blkfront] [ 102.348057] [] ? __kmalloc+0x1ea/0x200 [ 102.348057] [] blkfront_restore+0x2d/0x60 [xen_blkfront] [ 102.348057] [] xenbus_dev_restore+0x58/0x100 [ 102.348057] [] ? xenbus_frontend_delayed_resume+0x20/0x20 [ 102.348057] [] xenbus_dev_cond_restore+0x1e/0x30 [ 102.348057] [] dpm_run_callback+0x4e/0x130 [ 102.348057] [] device_resume+0xe7/0x210 [ 102.348057] [] ? pm_dev_dbg+0x80/0x80 [ 102.348057] [] dpm_resume+0x114/0x2f0 [ 102.348057] [] hibernation_snapshot+0x15f/0x380 [ 102.348057] [] hibernate+0x183/0x290 [ 102.348057] [] state_store+0xcf/0xe0 [ 102.348057] [] kobj_attr_store+0xf/0x20 [ 102.348057] [] sysfs_kf_write+0x3a/0x50 [ 102.348057] [] kernfs_fop_write+0x10b/0x190 [ 102.348057] [] __vfs_write+0x28/0x120 [ 102.348057] [] ? rw_verify_area+0x49/0xb0 [ 102.348057] [] vfs_write+0xb2/0x1b0 [ 102.348057] [] SyS_write+0x46/0xa0 [ 102.348057] [] entry_SYSCALL_64_fastpath+0x1a/0xa9 [ 102.423005] ---[ end trace b8d6718e22e2b107 ]--- [ 102.425031] genirq: Flags mismatch irq 6. 00000000 (blkif) vs. 00000000 (floppy) Note that we don't explicitly re-allocate event channels for such devices in the resume callback. Re-allocation will occur when PM core re-enable IRQs for the devices at later point. Signed-off-by: Munehisa Kamata Signed-off-by: Anchal Agarwal --- arch/x86/xen/suspend.c | 2 ++ drivers/xen/events/events_base.c | 12 ++++++++++++ include/xen/events.h | 1 + 3 files changed, 15 insertions(+) diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c index dae0f74f5390..affa63d4b6bd 100644 --- a/arch/x86/xen/suspend.c +++ b/arch/x86/xen/suspend.c @@ -105,6 +105,8 @@ static int xen_syscore_suspend(void) xen_save_steal_clock(cpu); } + xen_shutdown_pirqs(); + xrfp.domid = DOMID_SELF; xrfp.gpfn = __pa(HYPERVISOR_shared_info) >> PAGE_SHIFT; diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index 569437c158ca..b893536d8af4 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -1597,6 +1597,18 @@ void xen_irq_resume(void) restore_pirqs(); } +void xen_shutdown_pirqs(void) +{ + struct irq_info *info; + + list_for_each_entry(info, &xen_irq_list_head, list) { + if (info->type != IRQT_PIRQ || !VALID_EVTCHN(info->evtchn)) + continue; + + shutdown_pirq(irq_get_irq_data(info->irq)); + } +} + static struct irq_chip xen_dynamic_chip __read_mostly = { .name = "xen-dyn", diff --git a/include/xen/events.h b/include/xen/events.h index c0e6a0598397..39b2c4e4d2ef 100644 --- a/include/xen/events.h +++ b/include/xen/events.h @@ -71,6 +71,7 @@ static inline void notify_remote_via_evtchn(int port) void notify_remote_via_irq(int irq); void xen_irq_resume(void); +void xen_shutdown_pirqs(void); /* Clear an irq's pending state, in preparation for polling on it */ void xen_clear_irq_pending(int irq); From patchwork Tue Jan 7 23:44:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anchal Agarwal X-Patchwork-Id: 11322391 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 86FCD6C1 for ; Tue, 7 Jan 2020 23:44:42 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4A6DB20880 for ; 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Tue, 7 Jan 2020 23:44:36 +0000 (UTC) Received: from EX13D08UEB003.ant.amazon.com (10.43.60.11) by EX13MTAUEB002.ant.amazon.com (10.43.60.12) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:44:21 +0000 Received: from EX13MTAUEB002.ant.amazon.com (10.43.60.12) by EX13D08UEB003.ant.amazon.com (10.43.60.11) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:44:21 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.60.234) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 7 Jan 2020 23:44:20 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id CE67040E65; Tue, 7 Jan 2020 23:44:20 +0000 (UTC) Date: Tue, 7 Jan 2020 23:44:20 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 09/11] xen: Clear IRQD_IRQ_STARTED flag during shutdown PIRQs Message-ID: <20200107234420.GA18738@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: shutdown_pirq is invoked during hibernation path and hence PIRQs should be restarted during resume. Before this commit'020db9d3c1dc0a' xen/events: Fix interrupt lost during irq_disable and irq_enable startup_pirq was automatically called during irq_enable however, after this commit pirq's did not get explicitly started once resumed from hibernation. chip->irq_startup is called only if IRQD_IRQ_STARTED is unset during irq_startup on resume. This flag gets cleared by free_irq->irq_shutdown during suspend. free_irq() never gets explicitly called for ioapic-edge and ioapic-level interrupts as respective drivers do nothing during suspend/resume. So we shut them down explicitly in the first place in syscore_suspend path to clear IRQ<>event channel mapping. shutdown_pirq being called explicitly during suspend does not clear this flags, hence .irq_enable is called in irq_startup during resume instead and pirq's never start up. Signed-off-by: Anchal Agarwal --- drivers/xen/events/events_base.c | 1 + include/linux/irq.h | 1 + kernel/irq/chip.c | 3 ++- 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index b893536d8af4..aae7c4997b51 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -1606,6 +1606,7 @@ void xen_shutdown_pirqs(void) continue; shutdown_pirq(irq_get_irq_data(info->irq)); + irq_state_clr_started(irq_to_desc(info->irq)); } } diff --git a/include/linux/irq.h b/include/linux/irq.h index fb301cf29148..1e125cd22cf0 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -745,6 +745,7 @@ extern int irq_set_msi_desc(unsigned int irq, struct msi_desc *entry); extern int irq_set_msi_desc_off(unsigned int irq_base, unsigned int irq_offset, struct msi_desc *entry); extern struct irq_data *irq_get_irq_data(unsigned int irq); +extern void irq_state_clr_started(struct irq_desc *desc); static inline struct irq_chip *irq_get_chip(unsigned int irq) { diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index b76703b2c0af..3e8a36c673d6 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -173,10 +173,11 @@ static void irq_state_clr_masked(struct irq_desc *desc) irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED); } -static void irq_state_clr_started(struct irq_desc *desc) +void irq_state_clr_started(struct irq_desc *desc) { irqd_clear(&desc->irq_data, IRQD_IRQ_STARTED); } +EXPORT_SYMBOL_GPL(irq_state_clr_started); static void irq_state_set_started(struct irq_desc *desc) { From patchwork Tue Jan 7 23:44:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anchal Agarwal X-Patchwork-Id: 11322397 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8BC03138C for ; Tue, 7 Jan 2020 23:45:48 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 57B46206DB for ; Tue, 7 Jan 2020 23:45:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="EI/EFyjf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 57B46206DB Authentication-Results: mail.kernel.org; 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Tue, 7 Jan 2020 23:45:38 +0000 (UTC) Received: from EX13D08UEB001.ant.amazon.com (10.43.60.245) by EX13MTAUEB002.ant.amazon.com (10.43.60.12) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:44:58 +0000 Received: from EX13MTAUEA001.ant.amazon.com (10.43.61.82) by EX13D08UEB001.ant.amazon.com (10.43.60.245) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:44:57 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.61.243) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 7 Jan 2020 23:44:57 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id 9A92F40E65; Tue, 7 Jan 2020 23:44:57 +0000 (UTC) Date: Tue, 7 Jan 2020 23:44:57 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 10/11] PM / hibernate: update the resume offset on SNAPSHOT_SET_SWAP_AREA Message-ID: <20200107234457.GA18829@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Aleksei Besogonov The SNAPSHOT_SET_SWAP_AREA is supposed to be used to set the hibernation offset on a running kernel to enable hibernating to a swap file. However, it doesn't actually update the swsusp_resume_block variable. As a result, the hibernation fails at the last step (after all the data is written out) in the validation of the swap signature in mark_swapfiles(). Before this patch, the command line processing was the only place where swsusp_resume_block was set. Signed-off-by: Aleksei Besogonov Signed-off-by: Munehisa Kamata Signed-off-by: Anchal Agarwal --- kernel/power/user.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/kernel/power/user.c b/kernel/power/user.c index 77438954cc2b..d396e313cb7b 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -374,8 +374,12 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd, if (swdev) { offset = swap_area.offset; data->swap = swap_type_of(swdev, offset, NULL); - if (data->swap < 0) + if (data->swap < 0) { error = -ENODEV; + } else { + swsusp_resume_device = swdev; + swsusp_resume_block = offset; + } } else { data->swap = -1; error = -EINVAL; From patchwork Tue Jan 7 23:45:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anchal Agarwal X-Patchwork-Id: 11322401 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3CCA892A for ; 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Tue, 7 Jan 2020 23:45:52 +0000 (UTC) Received: from EX13D08UEE003.ant.amazon.com (10.43.62.118) by EX13MTAUEE002.ant.amazon.com (10.43.62.24) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:45:26 +0000 Received: from EX13MTAUEE002.ant.amazon.com (10.43.62.24) by EX13D08UEE003.ant.amazon.com (10.43.62.118) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:45:26 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.62.224) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 7 Jan 2020 23:45:26 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id 982CE40E65; Tue, 7 Jan 2020 23:45:26 +0000 (UTC) Date: Tue, 7 Jan 2020 23:45:26 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 11/11] x86: tsc: avoid system instability in hibernation Message-ID: <20200107234526.GA19034@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Eduardo Valentin System instability are seen during resume from hibernation when system is under heavy CPU load. This is due to the lack of update of sched clock data, and the scheduler would then think that heavy CPU hog tasks need more time in CPU, causing the system to freeze during the unfreezing of tasks. For example, threaded irqs, and kernel processes servicing network interface may be delayed for several tens of seconds, causing the system to be unreachable. Situation like this can be reported by using lockup detectors such as workqueue lockup detectors: [root@ip-172-31-67-114 ec2-user]# echo disk > /sys/power/state Message from syslogd@ip-172-31-67-114 at May 7 18:23:21 ... kernel:BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 57s! Message from syslogd@ip-172-31-67-114 at May 7 18:23:21 ... kernel:BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 57s! Message from syslogd@ip-172-31-67-114 at May 7 18:23:21 ... kernel:BUG: workqueue lockup - pool cpus=3 node=0 flags=0x1 nice=0 stuck for 57s! Message from syslogd@ip-172-31-67-114 at May 7 18:29:06 ... kernel:BUG: workqueue lockup - pool cpus=3 node=0 flags=0x1 nice=0 stuck for 403s! The fix for this situation is to mark the sched clock as unstable as early as possible in the resume path, leaving it unstable for the duration of the resume process. This will force the scheduler to attempt to align the sched clock across CPUs using the delta with time of day, updating sched clock data. In a post hibernation event, we can then mark the sched clock as stable again, avoiding unnecessary syncs with time of day on systems in which TSC is reliable. Reviewed-by: Erik Quanstrom Reviewed-by: Frank van der Linden Reviewed-by: Balbir Singh Reviewed-by: Munehisa Kamata Tested-by: Anchal Agarwal Signed-off-by: Eduardo Valentin --- arch/x86/kernel/tsc.c | 29 +++++++++++++++++++++++++++++ include/linux/sched/clock.h | 5 +++++ kernel/sched/clock.c | 4 ++-- 3 files changed, 36 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 7e322e2daaf5..ae77b8bc4e46 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -1534,3 +1535,31 @@ unsigned long calibrate_delay_is_known(void) return 0; } #endif + +static int tsc_pm_notifier(struct notifier_block *notifier, + unsigned long pm_event, void *unused) +{ + switch (pm_event) { + case PM_HIBERNATION_PREPARE: + clear_sched_clock_stable(); + break; + case PM_POST_HIBERNATION: + /* Set back to the default */ + if (!check_tsc_unstable()) + set_sched_clock_stable(); + break; + } + + return 0; +}; + +static struct notifier_block tsc_pm_notifier_block = { + .notifier_call = tsc_pm_notifier, +}; + +static int tsc_setup_pm_notifier(void) +{ + return register_pm_notifier(&tsc_pm_notifier_block); +} + +subsys_initcall(tsc_setup_pm_notifier); diff --git a/include/linux/sched/clock.h b/include/linux/sched/clock.h index 867d588314e0..902654ac5f7e 100644 --- a/include/linux/sched/clock.h +++ b/include/linux/sched/clock.h @@ -32,6 +32,10 @@ static inline void clear_sched_clock_stable(void) { } +static inline void set_sched_clock_stable(void) +{ +} + static inline void sched_clock_idle_sleep_event(void) { } @@ -51,6 +55,7 @@ static inline u64 local_clock(void) } #else extern int sched_clock_stable(void); +extern void set_sched_clock_stable(void); extern void clear_sched_clock_stable(void); /* diff --git a/kernel/sched/clock.c b/kernel/sched/clock.c index 1152259a4ca0..374d40e5b1a2 100644 --- a/kernel/sched/clock.c +++ b/kernel/sched/clock.c @@ -116,7 +116,7 @@ static void __scd_stamp(struct sched_clock_data *scd) scd->tick_raw = sched_clock(); } -static void __set_sched_clock_stable(void) +void set_sched_clock_stable(void) { struct sched_clock_data *scd; @@ -236,7 +236,7 @@ static int __init sched_clock_init_late(void) smp_mb(); /* matches {set,clear}_sched_clock_stable() */ if (__sched_clock_stable_early) - __set_sched_clock_stable(); + set_sched_clock_stable(); return 0; }