diff options
Diffstat (limited to 'arch/x86/power')
| -rw-r--r-- | arch/x86/power/cpu.c | 13 | ||||
| -rw-r--r-- | arch/x86/power/hibernate.c | 33 | ||||
| -rw-r--r-- | arch/x86/power/hibernate_32.c | 3 | ||||
| -rw-r--r-- | arch/x86/power/hibernate_64.c | 3 | ||||
| -rw-r--r-- | arch/x86/power/hibernate_asm_64.S | 3 |
5 files changed, 47 insertions, 8 deletions
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c index a7d966964c6f..24b079e94bc2 100644 --- a/arch/x86/power/cpu.c +++ b/arch/x86/power/cpu.c @@ -1,8 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Suspend support specific for i386/x86-64. * - * Distribute under GPLv2 - * * Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl> * Copyright (c) 2002 Pavel Machek <pavel@ucw.cz> * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org> @@ -299,7 +298,17 @@ int hibernate_resume_nonboot_cpu_disable(void) * address in its instruction pointer may not be possible to resolve * any more at that point (the page tables used by it previously may * have been overwritten by hibernate image data). + * + * First, make sure that we wake up all the potentially disabled SMT + * threads which have been initially brought up and then put into + * mwait/cpuidle sleep. + * Those will be put to proper (not interfering with hibernation + * resume) sleep afterwards, and the resumed kernel will decide itself + * what to do with them. */ + ret = cpuhp_smt_enable(); + if (ret) + return ret; smp_ops.play_dead = resume_play_dead; ret = disable_nonboot_cpus(); smp_ops.play_dead = play_dead; diff --git a/arch/x86/power/hibernate.c b/arch/x86/power/hibernate.c index 4845b8c7be7f..fc413717a45f 100644 --- a/arch/x86/power/hibernate.c +++ b/arch/x86/power/hibernate.c @@ -11,6 +11,7 @@ #include <linux/suspend.h> #include <linux/scatterlist.h> #include <linux/kdebug.h> +#include <linux/cpu.h> #include <crypto/hash.h> @@ -245,3 +246,35 @@ out: __flush_tlb_all(); return 0; } + +int arch_resume_nosmt(void) +{ + int ret = 0; + /* + * We reached this while coming out of hibernation. This means + * that SMT siblings are sleeping in hlt, as mwait is not safe + * against control transition during resume (see comment in + * hibernate_resume_nonboot_cpu_disable()). + * + * If the resumed kernel has SMT disabled, we have to take all the + * SMT siblings out of hlt, and offline them again so that they + * end up in mwait proper. + * + * Called with hotplug disabled. + */ + cpu_hotplug_enable(); + if (cpu_smt_control == CPU_SMT_DISABLED || + cpu_smt_control == CPU_SMT_FORCE_DISABLED) { + enum cpuhp_smt_control old = cpu_smt_control; + + ret = cpuhp_smt_enable(); + if (ret) + goto out; + ret = cpuhp_smt_disable(old); + if (ret) + goto out; + } +out: + cpu_hotplug_disable(); + return ret; +} diff --git a/arch/x86/power/hibernate_32.c b/arch/x86/power/hibernate_32.c index be15bdcb20df..a1061d471b73 100644 --- a/arch/x86/power/hibernate_32.c +++ b/arch/x86/power/hibernate_32.c @@ -1,8 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Hibernation support specific for i386 - temporary page tables * - * Distribute under GPLv2 - * * Copyright (c) 2006 Rafael J. Wysocki <rjw@sisk.pl> */ diff --git a/arch/x86/power/hibernate_64.c b/arch/x86/power/hibernate_64.c index 239f424ccb29..0197095d9637 100644 --- a/arch/x86/power/hibernate_64.c +++ b/arch/x86/power/hibernate_64.c @@ -1,8 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Hibernation support for x86-64 * - * Distribute under GPLv2 - * * Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl> * Copyright (c) 2002 Pavel Machek <pavel@ucw.cz> * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org> diff --git a/arch/x86/power/hibernate_asm_64.S b/arch/x86/power/hibernate_asm_64.S index 3008baa2fa95..a4d5eb0a7ece 100644 --- a/arch/x86/power/hibernate_asm_64.S +++ b/arch/x86/power/hibernate_asm_64.S @@ -1,8 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ /* * Hibernation support for x86-64 * - * Distribute under GPLv2. - * * Copyright 2007 Rafael J. Wysocki <rjw@sisk.pl> * Copyright 2005 Andi Kleen <ak@suse.de> * Copyright 2004 Pavel Machek <pavel@suse.cz> |