Re: [BUG?] Interrupts enabled afterxen_acpi_processor_resume+0x0/0x34 [xen_acpi_processor]

From: Konrad Rzeszutek Wilk
Date: Mon Feb 03 2014 - 09:14:57 EST


On Mon, Feb 03, 2014 at 11:12:16AM +0100, Stanislaw Gruszka wrote:
> On Fri, Jan 31, 2014 at 11:01:40AM -0500, Konrad Rzeszutek Wilk wrote:
> > Perhaps by using 'subsys_system_register' and stick it there?
>
> This will not call ->resume callback as it is only called for
> devices, so additional dummy device is needed, for example:
>
> struct device xap_dev = {
> .init_name = "xen-acpi-processor-dev",
> .bus = &xap_bus,
> };
> ...
> subsys_system_register(&xap_bus, NULL);
> device_register(&xap_dev);
>
> But I'm not sure if that is good solution. It crate some not necessery
> sysfs directories and files. Additionaly it can restore CPU C-states
> after some other drivers resume, which prehaps require proper C-states.

Yes.
>
> Hence maybe adding direct notify from xen core resume will be better
> idea (proposed patch below). Plese let me know what you think, I'll
> provide solution which you choose to bug reporters for testing.

Let me think about it for a day or so.

Thanks!
>
> Thanks
> Stanislaw
>
> diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
> index 624e8dc..96e4173 100644
> --- a/drivers/xen/manage.c
> +++ b/drivers/xen/manage.c
> @@ -13,6 +13,7 @@
> #include <linux/freezer.h>
> #include <linux/syscore_ops.h>
> #include <linux/export.h>
> +#include <linux/notifier.h>
>
> #include <xen/xen.h>
> #include <xen/xenbus.h>
> @@ -46,6 +47,20 @@ struct suspend_info {
> void (*post)(int cancelled);
> };
>
> +static RAW_NOTIFIER_HEAD(xen_resume_notifier);
> +
> +void xen_resume_notifier_register(struct notifier_block *nb)
> +{
> + raw_notifier_chain_register(&xen_resume_notifier, nb);
> +}
> +EXPORT_SYMBOL_GPL(xen_resume_notifier_register);
> +
> +void xen_resume_notifier_unregister(struct notifier_block *nb)
> +{
> + raw_notifier_chain_unregister(&xen_resume_notifier, nb);
> +}
> +EXPORT_SYMBOL_GPL(xen_resume_notifier_unregister);
> +
> #ifdef CONFIG_HIBERNATE_CALLBACKS
> static void xen_hvm_post_suspend(int cancelled)
> {
> @@ -152,6 +167,8 @@ static void do_suspend(void)
>
> err = stop_machine(xen_suspend, &si, cpumask_of(0));
>
> + raw_notifier_call_chain(&xen_resume_notifier, 0, NULL);
> +
> dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE);
>
> if (err) {
> diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c
> index 7231859..82358d1 100644
> --- a/drivers/xen/xen-acpi-processor.c
> +++ b/drivers/xen/xen-acpi-processor.c
> @@ -27,10 +27,10 @@
> #include <linux/init.h>
> #include <linux/module.h>
> #include <linux/types.h>
> -#include <linux/syscore_ops.h>
> #include <linux/acpi.h>
> #include <acpi/processor.h>
> #include <xen/xen.h>
> +#include <xen/xen-ops.h>
> #include <xen/interface/platform.h>
> #include <asm/xen/hypercall.h>
>
> @@ -495,14 +495,15 @@ static int xen_upload_processor_pm_data(void)
> return rc;
> }
>
> -static void xen_acpi_processor_resume(void)
> +static int xen_acpi_processor_resume(struct notifier_block *nb,
> + unsigned long action, void *data)
> {
> bitmap_zero(acpi_ids_done, nr_acpi_bits);
> - xen_upload_processor_pm_data();
> + return xen_upload_processor_pm_data();
> }
>
> -static struct syscore_ops xap_syscore_ops = {
> - .resume = xen_acpi_processor_resume,
> +struct notifier_block xen_acpi_processor_resume_nb = {
> + .notifier_call = xen_acpi_processor_resume,
> };
>
> static int __init xen_acpi_processor_init(void)
> @@ -555,7 +556,7 @@ static int __init xen_acpi_processor_init(void)
> if (rc)
> goto err_unregister;
>
> - register_syscore_ops(&xap_syscore_ops);
> + xen_resume_notifier_register(&xen_acpi_processor_resume_nb);
>
> return 0;
> err_unregister:
> @@ -574,7 +575,7 @@ static void __exit xen_acpi_processor_exit(void)
> {
> int i;
>
> - unregister_syscore_ops(&xap_syscore_ops);
> + xen_resume_notifier_unregister(&xen_acpi_processor_resume_nb);
> kfree(acpi_ids_done);
> kfree(acpi_id_present);
> kfree(acpi_id_cst_present);
> diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
> index fb2ea8f..6412358 100644
> --- a/include/xen/xen-ops.h
> +++ b/include/xen/xen-ops.h
> @@ -16,6 +16,9 @@ void xen_mm_unpin_all(void);
> void xen_timer_resume(void);
> void xen_arch_resume(void);
>
> +void xen_resume_notifier_register(struct notifier_block *nb);
> +void xen_resume_notifier_unregister(struct notifier_block *nb);
> +
> int xen_setup_shutdown_event(void);
>
> extern unsigned long *xen_contiguous_bitmap;
--
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