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From: "Rafael J. Wysocki" <rafael@kernel.org>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Lina Iyer <lina.iyer@linaro.org>,
	John Stultz <john.stultz@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Rafael J . Wysocki" <rjw@rjwysocki.net>,
	Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
	Rob Herring <robh+dt@kernel.org>,
	Magnus Damm <magnus.damm@gmail.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	Linux PM list <linux-pm@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power
Date: Wed, 22 Feb 2017 15:57:11 +0100	[thread overview]
Message-ID: <CAJZ5v0ihFCe0phwKQHDnPETkfPgKDiWw27GOs8jVv1hyahJ+DQ@mail.gmail.com> (raw)
In-Reply-To: <CAMuHMdW8JAYrgvWxi8c_ZLtsUWBYFGZ=V7pu2p+cO=NdwLas2w@mail.gmail.com>

On Wed, Feb 22, 2017 at 3:05 PM, Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> Hi Mark,
>
> On Tue, Feb 21, 2017 at 6:48 PM, Mark Rutland <mark.rutland@arm.com> wrote:
>> On Mon, Feb 20, 2017 at 09:33:27PM +0100, Geert Uytterhoeven wrote:
>>> @@ -440,12 +442,14 @@ static int psci_system_suspend_valid(suspend_state_t state)
>>>  static int psci_system_suspend_enter(suspend_state_t state)
>>>  {
>>>       switch (state) {
>>> +     case PM_SUSPEND_MEM:
>>> +             if (!psci_system_suspend_is_power_down ||
>>> +                 !wakeup_source_available())
>>> +                     return cpu_suspend(0, psci_system_suspend);
>>> +             /* fall through */
>>
>> I don't believe that this is the correct place to handle this.
>>
>> The wakeup_source_available() check *might* be ok, though even with that
>> I'd rather we rejected the request rather than trying to fall back to a
>> PSCI_CPU_SUSPEND. Otherwise we have a potential silent power regression.
>
> If we reject the request here, I think the PM core has to be modified to
> try again using a shallower state. Note that it would be better to reject
> the state in the .valid() callback instead of in .enter().
>
> You also have to consider this is dynamic not static.
> I.e. the availability of other wake-up sources may change at runtime (cfr.
> the "wakeup" files in sysfs). Currently pm_sleep_states[] (which controls
> which states are available) is initialized from suspend_set_ops(), and not
> changed later.
>
> Perhaps pm_sleep_states[] should be updated every time the wakeup_sources
> list is changed?

No, the definitions of sleep states *are* static.  They have to be, or
user space won't know what sleep state it is asking for.

And, as I said in my last reply to Sudeep, the list of possible wakeup
devices for the given state is part of that definition.  The sysfs
"wakeup" interface is on top of that, not the other way around (which
seems seems to be what you would want).

Thanks,
Rafael

WARNING: multiple messages have this Message-ID
From: "Rafael J. Wysocki" <rafael-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>
Cc: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	Geert Uytterhoeven
	<geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>,
	Lorenzo Pieralisi
	<lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>,
	Sudeep Holla <sudeep.holla-5wv7dgnIgG8@public.gmane.org>,
	Lina Iyer <lina.iyer-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	John Stultz <john.stultz-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
	Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
	"Rafael J . Wysocki"
	<rjw-LthD3rsA81gm4RdzfppkhA@public.gmane.org>,
	Len Brown <len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
	Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Magnus Damm <magnus.damm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	Linux-Renesas
	<linux-renesas-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Linux PM list <linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power
Date: Wed, 22 Feb 2017 15:57:11 +0100	[thread overview]
Message-ID: <CAJZ5v0ihFCe0phwKQHDnPETkfPgKDiWw27GOs8jVv1hyahJ+DQ@mail.gmail.com> (raw)
In-Reply-To: <CAMuHMdW8JAYrgvWxi8c_ZLtsUWBYFGZ=V7pu2p+cO=NdwLas2w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On Wed, Feb 22, 2017 at 3:05 PM, Geert Uytterhoeven
<geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org> wrote:
> Hi Mark,
>
> On Tue, Feb 21, 2017 at 6:48 PM, Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org> wrote:
>> On Mon, Feb 20, 2017 at 09:33:27PM +0100, Geert Uytterhoeven wrote:
>>> @@ -440,12 +442,14 @@ static int psci_system_suspend_valid(suspend_state_t state)
>>>  static int psci_system_suspend_enter(suspend_state_t state)
>>>  {
>>>       switch (state) {
>>> +     case PM_SUSPEND_MEM:
>>> +             if (!psci_system_suspend_is_power_down ||
>>> +                 !wakeup_source_available())
>>> +                     return cpu_suspend(0, psci_system_suspend);
>>> +             /* fall through */
>>
>> I don't believe that this is the correct place to handle this.
>>
>> The wakeup_source_available() check *might* be ok, though even with that
>> I'd rather we rejected the request rather than trying to fall back to a
>> PSCI_CPU_SUSPEND. Otherwise we have a potential silent power regression.
>
> If we reject the request here, I think the PM core has to be modified to
> try again using a shallower state. Note that it would be better to reject
> the state in the .valid() callback instead of in .enter().
>
> You also have to consider this is dynamic not static.
> I.e. the availability of other wake-up sources may change at runtime (cfr.
> the "wakeup" files in sysfs). Currently pm_sleep_states[] (which controls
> which states are available) is initialized from suspend_set_ops(), and not
> changed later.
>
> Perhaps pm_sleep_states[] should be updated every time the wakeup_sources
> list is changed?

No, the definitions of sleep states *are* static.  They have to be, or
user space won't know what sleep state it is asking for.

And, as I said in my last reply to Sudeep, the list of possible wakeup
devices for the given state is part of that definition.  The sysfs
"wakeup" interface is on top of that, not the other way around (which
seems seems to be what you would want).

Thanks,
Rafael
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WARNING: multiple messages have this Message-ID
From: rafael@kernel.org (Rafael J. Wysocki)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power
Date: Wed, 22 Feb 2017 15:57:11 +0100	[thread overview]
Message-ID: <CAJZ5v0ihFCe0phwKQHDnPETkfPgKDiWw27GOs8jVv1hyahJ+DQ@mail.gmail.com> (raw)
In-Reply-To: <CAMuHMdW8JAYrgvWxi8c_ZLtsUWBYFGZ=V7pu2p+cO=NdwLas2w@mail.gmail.com>

On Wed, Feb 22, 2017 at 3:05 PM, Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> Hi Mark,
>
> On Tue, Feb 21, 2017 at 6:48 PM, Mark Rutland <mark.rutland@arm.com> wrote:
>> On Mon, Feb 20, 2017 at 09:33:27PM +0100, Geert Uytterhoeven wrote:
>>> @@ -440,12 +442,14 @@ static int psci_system_suspend_valid(suspend_state_t state)
>>>  static int psci_system_suspend_enter(suspend_state_t state)
>>>  {
>>>       switch (state) {
>>> +     case PM_SUSPEND_MEM:
>>> +             if (!psci_system_suspend_is_power_down ||
>>> +                 !wakeup_source_available())
>>> +                     return cpu_suspend(0, psci_system_suspend);
>>> +             /* fall through */
>>
>> I don't believe that this is the correct place to handle this.
>>
>> The wakeup_source_available() check *might* be ok, though even with that
>> I'd rather we rejected the request rather than trying to fall back to a
>> PSCI_CPU_SUSPEND. Otherwise we have a potential silent power regression.
>
> If we reject the request here, I think the PM core has to be modified to
> try again using a shallower state. Note that it would be better to reject
> the state in the .valid() callback instead of in .enter().
>
> You also have to consider this is dynamic not static.
> I.e. the availability of other wake-up sources may change at runtime (cfr.
> the "wakeup" files in sysfs). Currently pm_sleep_states[] (which controls
> which states are available) is initialized from suspend_set_ops(), and not
> changed later.
>
> Perhaps pm_sleep_states[] should be updated every time the wakeup_sources
> list is changed?

No, the definitions of sleep states *are* static.  They have to be, or
user space won't know what sleep state it is asking for.

And, as I said in my last reply to Sudeep, the list of possible wakeup
devices for the given state is part of that definition.  The sysfs
"wakeup" interface is on top of that, not the other way around (which
seems seems to be what you would want).

Thanks,
Rafael

  reply	other threads:[~2017-02-22 14:57 UTC|newest]

Thread overview: 145+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-20 20:33 [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven
2017-02-20 20:33 ` Geert Uytterhoeven
2017-02-20 20:33 ` [PATCH/RFC 1/6] alarmtimer: Postpone wake-up source registration until really available Geert Uytterhoeven
2017-02-20 20:33   ` Geert Uytterhoeven
2017-02-20 20:33 ` [PATCH/RFC 2/6] PM / Wakeup: Add wakeup_source_available() Geert Uytterhoeven
2017-02-20 20:33   ` Geert Uytterhoeven
2017-02-20 20:33 ` [PATCH/RFC 3/6] drivers: firmware: psci: Implement shallow suspend mode Geert Uytterhoeven
2017-02-20 20:33   ` Geert Uytterhoeven
2017-02-21 10:42   ` Sudeep Holla
2017-02-21 10:42     ` Sudeep Holla
2017-02-21 16:23     ` Geert Uytterhoeven
2017-02-21 16:23       ` Geert Uytterhoeven
2017-02-21 16:23       ` Geert Uytterhoeven
2017-02-21 16:51       ` Sudeep Holla
2017-02-21 16:51         ` Sudeep Holla
2017-02-21 16:51         ` Sudeep Holla
2017-02-21 11:07   ` Pavel Machek
2017-02-21 11:07     ` Pavel Machek
2017-02-21 11:07     ` Pavel Machek
2017-02-21 11:14     ` Sudeep Holla
2017-02-21 11:14       ` Sudeep Holla
2017-02-21 11:14       ` Sudeep Holla
2017-02-21 16:32       ` Geert Uytterhoeven
2017-02-21 16:32         ` Geert Uytterhoeven
2017-02-21 16:32         ` Geert Uytterhoeven
2017-02-21 17:20         ` Mark Rutland
2017-02-21 17:20           ` Mark Rutland
2017-02-21 17:20           ` Mark Rutland
2017-02-21 17:20           ` Mark Rutland
2017-02-21 18:06           ` Geert Uytterhoeven
2017-02-21 18:06             ` Geert Uytterhoeven
2017-02-21 18:06             ` Geert Uytterhoeven
2017-02-21 18:06             ` Geert Uytterhoeven
2017-02-21 18:18             ` Mark Rutland
2017-02-21 18:18               ` Mark Rutland
2017-02-21 18:18               ` Mark Rutland
2017-02-21 18:23               ` Geert Uytterhoeven
2017-02-21 18:23                 ` Geert Uytterhoeven
2017-02-21 18:23                 ` Geert Uytterhoeven
2017-02-21 18:23                 ` Geert Uytterhoeven
2017-02-21 17:22         ` Sudeep Holla
2017-02-21 17:22           ` Sudeep Holla
2017-02-21 17:22           ` Sudeep Holla
2017-02-21 17:22           ` Sudeep Holla
2017-02-22 13:47           ` Geert Uytterhoeven
2017-02-22 13:47             ` Geert Uytterhoeven
2017-02-22 13:47             ` Geert Uytterhoeven
2017-02-22 14:35             ` Sudeep Holla
2017-02-22 14:35               ` Sudeep Holla
2017-02-22 14:35               ` Sudeep Holla
2017-02-20 20:33 ` [PATCH/RFC 4/6] drivers: firmware: psci: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Geert Uytterhoeven
2017-02-20 20:33   ` Geert Uytterhoeven
2017-02-21 10:50   ` Sudeep Holla
2017-02-21 10:50     ` Sudeep Holla
2017-02-21 16:36     ` Geert Uytterhoeven
2017-02-21 16:36       ` Geert Uytterhoeven
2017-02-21 16:36       ` Geert Uytterhoeven
2017-02-21 16:49       ` Sudeep Holla
2017-02-21 16:49         ` Sudeep Holla
2017-02-21 16:49         ` Sudeep Holla
2017-02-21 11:07   ` Pavel Machek
2017-02-21 11:07     ` Pavel Machek
2017-02-21 16:36     ` Geert Uytterhoeven
2017-02-21 16:36       ` Geert Uytterhoeven
2017-02-21 16:36       ` Geert Uytterhoeven
2017-02-21 17:54     ` Mark Rutland
2017-02-21 17:54       ` Mark Rutland
2017-02-21 17:48   ` Mark Rutland
2017-02-21 17:48     ` Mark Rutland
2017-02-22 14:05     ` Geert Uytterhoeven
2017-02-22 14:05       ` Geert Uytterhoeven
2017-02-22 14:05       ` Geert Uytterhoeven
2017-02-22 14:57       ` Rafael J. Wysocki [this message]
2017-02-22 14:57         ` Rafael J. Wysocki
2017-02-22 14:57         ` Rafael J. Wysocki
2017-02-22 14:57         ` Rafael J. Wysocki
2017-02-20 20:33 ` [PATCH/RFC 5/6] arm64: dts: r8a7795: Fix non-PMIC wake-up sources Geert Uytterhoeven
2017-02-20 20:33   ` Geert Uytterhoeven
2017-02-20 20:33   ` Geert Uytterhoeven
2017-02-20 20:33 ` [PATCH/RFC 6/6] arm64: dts: r8a7796: " Geert Uytterhoeven
2017-02-20 20:33   ` Geert Uytterhoeven
2017-02-21 10:38 ` [PATCH/RFC 0/6] PSCI: Fix non-PMIC wake-up if SYSTEM_SUSPEND cuts power Sudeep Holla
2017-02-21 10:38   ` Sudeep Holla
2017-02-21 16:21   ` Geert Uytterhoeven
2017-02-21 16:21     ` Geert Uytterhoeven
2017-02-21 16:21     ` Geert Uytterhoeven
2017-02-21 16:45     ` Sudeep Holla
2017-02-21 16:45       ` Sudeep Holla
2017-02-21 16:45       ` Sudeep Holla
2017-02-21 16:45       ` Sudeep Holla
2017-02-21 17:34       ` Geert Uytterhoeven
2017-02-21 17:34         ` Geert Uytterhoeven
2017-02-21 17:34         ` Geert Uytterhoeven
2017-02-21 17:51         ` Sudeep Holla
2017-02-21 17:51           ` Sudeep Holla
2017-02-21 17:51           ` Sudeep Holla
2017-02-21 18:27           ` Sudeep Holla
2017-02-21 18:27             ` Sudeep Holla
2017-02-21 18:27             ` Sudeep Holla
2017-02-21 18:27             ` Sudeep Holla
2017-02-21 18:45             ` Sudeep Holla
2017-02-21 18:45               ` Sudeep Holla
2017-02-21 18:45               ` Sudeep Holla
2017-02-21 18:45               ` Sudeep Holla
2017-02-22  1:14               ` Rafael J. Wysocki
2017-02-22  1:14                 ` Rafael J. Wysocki
2017-02-22  1:14                 ` Rafael J. Wysocki
2017-02-22 11:03                 ` Sudeep Holla
2017-02-22 11:03                   ` Sudeep Holla
2017-02-22 11:03                   ` Sudeep Holla
2017-02-22 13:38                   ` Geert Uytterhoeven
2017-02-22 13:38                     ` Geert Uytterhoeven
2017-02-22 13:38                     ` Geert Uytterhoeven
2017-02-22 14:32                     ` Sudeep Holla
2017-02-22 14:32                       ` Sudeep Holla
2017-02-22 14:32                       ` Sudeep Holla
2017-02-22 14:32                       ` Sudeep Holla
2017-02-22 14:50                       ` Rafael J. Wysocki
2017-02-22 14:50                         ` Rafael J. Wysocki
2017-02-22 14:50                         ` Rafael J. Wysocki
2017-02-22 14:50                         ` Rafael J. Wysocki
2017-02-22 15:24                         ` Sudeep Holla
2017-02-22 15:24                           ` Sudeep Holla
2017-02-22 15:24                           ` Sudeep Holla
2017-02-22 15:24                           ` Sudeep Holla
2017-02-23 15:26                       ` Geert Uytterhoeven
2017-02-23 15:26                         ` Geert Uytterhoeven
2017-02-23 15:26                         ` Geert Uytterhoeven
2017-02-23 15:34                         ` Geert Uytterhoeven
2017-02-23 15:34                           ` Geert Uytterhoeven
2017-02-23 15:34                           ` Geert Uytterhoeven
2017-02-23 15:58                           ` Sudeep Holla
2017-02-23 15:58                             ` Sudeep Holla
2017-02-23 15:58                             ` Sudeep Holla
2017-02-23 15:53                         ` Sudeep Holla
2017-02-23 15:53                           ` Sudeep Holla
2017-02-23 15:53                           ` Sudeep Holla
2017-02-23 15:53                           ` Sudeep Holla
2017-02-22 13:14                 ` Geert Uytterhoeven
2017-02-22 13:14                   ` Geert Uytterhoeven
2017-02-22 13:14                   ` Geert Uytterhoeven
2017-02-22 14:31                   ` Rafael J. Wysocki
2017-02-22 14:31                     ` Rafael J. Wysocki
2017-02-22 14:31                     ` Rafael J. Wysocki
2017-02-22 14:31                     ` Rafael J. Wysocki

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