Date:	Wed, 10 Aug 2016 10:41:11 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Jon Hunter <jonathanh@...dia.com>
Cc:	John Stultz <john.stultz@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>,
	Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [Regression] "irqdomain: Don't set type when mapping an IRQ"
 breaks nexus7 gpio buttons

Hi Linus,

On 10/08/16 00:03, Linus Walleij wrote:
> On Tue, Aug 9, 2016 at 3:20 PM, Jon Hunter <jonathanh@...dia.com> wrote:
> 
>> If that works, then does the following also work (without the above) ...
>>
>> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
>> index b4c1bc7c9ca2..e111b72e3162 100644
>> --- a/kernel/irq/chip.c
>> +++ b/kernel/irq/chip.c
>> @@ -824,6 +824,7 @@ __irq_do_set_handler(struct irq_desc *desc, irq_flow_handler_t handle,
>>                 irq_settings_set_norequest(desc);
>>                 irq_settings_set_nothread(desc);
>>                 desc->action = &chained_action;
>> +               __irq_set_trigger(desc, irqd_get_trigger_type(&desc->irq_data));
>>                 irq_startup(desc, true);
>>         }
>>  }
>>
>> It looks like there is a path for parent interrupts where the type
>> is not getting set. If the above works then we can discuss with Thomas
>> and Marc on the correct fix.
> 
> I tried this on my problematic platform and then this happens:
> 
> preparing networking...
> [    2.628246] ------------[ cut here ]------------
> [    2.628303] WARNING: CPU: 0 PID: 92 at ../kernel/irq/chip.c:26
> bad_chained_irq+0x44/0x4c
> [    2.631939] Chained irq 109 should not call an action
> [    2.640008] Modules linked in:
> [    2.647909] CPU: 0 PID: 92 Comm: ip Not tainted
> 4.8.0-rc1-00011-ga21e27b4cb66 #194
> [    2.647996] Hardware name: Generic DT based system
> [    2.655486] [<c030f8c8>] (unwind_backtrace) from [<c030c714>]
> (show_stack+0x10/0x14)
> [    2.660254] [<c030c714>] (show_stack) from [<c05df420>]
> (dump_stack+0x78/0x8c)
> [    2.668147] [<c05df420>] (dump_stack) from [<c031cef4>] (__warn+0xec/0x104)
> [    2.675173] [<c031cef4>] (__warn) from [<c031cf44>]
> (warn_slowpath_fmt+0x38/0x48)
> [    2.682033] [<c031cf44>] (warn_slowpath_fmt) from [<c0369160>]
> (bad_chained_irq+0x44/0x4c)
> [    2.689687] [<c0369160>] (bad_chained_irq) from [<c0365e28>]
> (__handle_irq_event_percpu+0x5c/0x290)
> [    2.697836] [<c0365e28>] (__handle_irq_event_percpu) from
> [<c0366078>] (handle_irq_event_percpu+0x1c/0x58)
> [    2.706778] [<c0366078>] (handle_irq_event_percpu) from
> [<c03660ec>] (handle_irq_event+0x38/0x5c)
> [    2.716498] [<c03660ec>] (handle_irq_event) from [<c03693f0>]
> (handle_level_irq+0xc4/0x150)
> [    2.725438] [<c03693f0>] (handle_level_irq) from [<c036542c>]
> (generic_handle_irq+0x24/0x34)
> [    2.733602] [<c036542c>] (generic_handle_irq) from [<c06127d4>]
> (msm_gpio_irq_handler+0xc8/0x150)
> [    2.742280] [<c06127d4>] (msm_gpio_irq_handler) from [<c036542c>]
> (generic_handle_irq+0x24/0x34)
> [    2.751048] [<c036542c>] (generic_handle_irq) from [<c0365720>]
> (__handle_domain_irq+0x7c/0xec)
> [    2.759901] [<c0365720>] (__handle_domain_irq) from [<c0301464>]
> (gic_handle_irq+0x48/0x8c)
> [    2.768323] [<c0301464>] (gic_handle_irq) from [<c08b8e4c>]
> (__irq_svc+0x6c/0xa8)
> [    2.776644] Exception stack(0xdeca1d48 to 0xdeca1d90)
> [    2.784284] 1d40:                   deca1dc0 00000000 00000000
> deca0018 ffff8bd6 deca1dc0
> [    2.789324] 1d60: 00000000 c0378ad0 60070013 00000000 00000000
> 001f3df8 c108fa04 deca1d98
> [    2.797481] 1d80: c08b77fc c0377930 60070013 ffffffff
> [    2.805651] [<c08b8e4c>] (__irq_svc) from [<c0377930>]
> (init_timer_key+0x28/0x104)
> [    2.810679] [<c0377930>] (init_timer_key) from [<c08b77fc>]
> (schedule_timeout+0x48/0x410)
> [    2.818145] [<c08b77fc>] (schedule_timeout) from [<c0378ad0>]
> (msleep+0x2c/0x38)
> [    2.826399] [<c0378ad0>] (msleep) from [<c06c2980>]
> (smsc911x_open+0x268/0x50c)
> [    2.833859] [<c06c2980>] (smsc911x_open) from [<c07c1994>]
> (__dev_open+0xa8/0x10c)
> [    2.840887] [<c07c1994>] (__dev_open) from [<c07c1c1c>]
> (__dev_change_flags+0x94/0x144)
> [    2.848525] [<c07c1c1c>] (__dev_change_flags) from [<c07c1ce4>]
> (dev_change_flags+0x18/0x48)
> [    2.856428] [<c07c1ce4>] (dev_change_flags) from [<c0823048>]
> (devinet_ioctl+0x6b0/0x768)
> [    2.865120] [<c0823048>] (devinet_ioctl) from [<c07a4ac4>]
> (sock_ioctl+0x1f4/0x2c8)
> [    2.873186] [<c07a4ac4>] (sock_ioctl) from [<c0432678>]
> (do_vfs_ioctl+0x9c/0x910)
> [    2.880645] [<c0432678>] (do_vfs_ioctl) from [<c0432f20>]
> (SyS_ioctl+0x34/0x5c)
> [    2.888290] [<c0432f20>] (SyS_ioctl) from [<c0308480>]
> (ret_fast_syscall+0x0/0x3c)
> [    2.895395] ---[ end trace a53e1e63b7bdfc4a ]---
> [    2.903917] random: fast init done
> [    3.036378] random: crng init done
> [    3.883906] irq 109: nobody cared (try booting with the "irqpoll" option)
> [    3.883940] CPU: 0 PID: 92 Comm: ip Tainted: G        W
> 4.8.0-rc1-00011-ga21e27b4cb66 #194
> [    3.889673] Hardware name: Generic DT based system
> [    3.898538] [<c030f8c8>] (unwind_backtrace) from [<c030c714>]
> (show_stack+0x10/0x14)
> [    3.903137] [<c030c714>] (show_stack) from [<c05df420>]
> (dump_stack+0x78/0x8c)
> [    3.911034] [<c05df420>] (dump_stack) from [<c0368804>]
> (__report_bad_irq+0x28/0xcc)
> [    3.918065] [<c0368804>] (__report_bad_irq) from [<c0368c18>]
> (note_interrupt+0x298/0x2e8)
> [    3.925971] [<c0368c18>] (note_interrupt) from [<c03660a8>]
> (handle_irq_event_percpu+0x4c/0x58)
> [    3.934040] [<c03660a8>] (handle_irq_event_percpu) from
> [<c03660ec>] (handle_irq_event+0x38/0x5c)
> [    3.942634] [<c03660ec>] (handle_irq_event) from [<c03693f0>]
> (handle_level_irq+0xc4/0x150)
> [    3.951660] [<c03693f0>] (handle_level_irq) from [<c036542c>]
> (generic_handle_irq+0x24/0x34)
> [    3.959821] [<c036542c>] (generic_handle_irq) from [<c06127d4>]
> (msm_gpio_irq_handler+0xc8/0x150)
> [    3.968502] [<c06127d4>] (msm_gpio_irq_handler) from [<c036542c>]
> (generic_handle_irq+0x24/0x34)
> [    3.977269] [<c036542c>] (generic_handle_irq) from [<c0365720>]
> (__handle_domain_irq+0x7c/0xec)
> [    3.986122] [<c0365720>] (__handle_domain_irq) from [<c0301464>]
> (gic_handle_irq+0x48/0x8c)
> [    3.994541] [<c0301464>] (gic_handle_irq) from [<c08b8e4c>]
> (__irq_svc+0x6c/0xa8)
> [    4.002865] Exception stack(0xdeca1c60 to 0xdeca1ca8)
> [    4.010507] 1c60: 00000000 c0abce68 c109f9c0 00000000 c109f9c0
> 00000000 deca0000 00000000
> [    4.015546] 1c80: 00000282 deca1d48 c0210800 001f3df8 e080400c
> deca1cb0 c0322330 c0322340
> [    4.023701] 1ca0: 20070113 ffffffff
> [    4.031868] [<c08b8e4c>] (__irq_svc) from [<c0322340>]
> (__do_softirq+0x9c/0x388)
> [    4.035166] [<c0322340>] (__do_softirq) from [<c03228f0>]
> (irq_exit+0xc0/0xfc)
> [    4.042805] [<c03228f0>] (irq_exit) from [<c0365724>]
> (__handle_domain_irq+0x80/0xec)
> [    4.049835] [<c0365724>] (__handle_domain_irq) from [<c0301464>]
> (gic_handle_irq+0x48/0x8c)
> [    4.057735] [<c0301464>] (gic_handle_irq) from [<c08b8e4c>]
> (__irq_svc+0x6c/0xa8)
> [    4.065887] Exception stack(0xdeca1d48 to 0xdeca1d90)
> [    4.073528] 1d40:                   deca1dc0 00000000 00000000
> deca0018 ffff8bd6 deca1dc0
> [    4.078566] 1d60: 00000000 c0378ad0 60070013 00000000 00000000
> 001f3df8 c108fa04 deca1d98
> [    4.086723] 1d80: c08b77fc c0377930 60070013 ffffffff
> [    4.094889] [<c08b8e4c>] (__irq_svc) from [<c0377930>]
> (init_timer_key+0x28/0x104)
> [    4.099921] [<c0377930>] (init_timer_key) from [<c08b77fc>]
> (schedule_timeout+0x48/0x410)
> [    4.107389] [<c08b77fc>] (schedule_timeout) from [<c0378ad0>]
> (msleep+0x2c/0x38)
> [    4.115640] [<c0378ad0>] (msleep) from [<c06c2980>]
> (smsc911x_open+0x268/0x50c)
> [    4.123100] [<c06c2980>] (smsc911x_open) from [<c07c1994>]
> (__dev_open+0xa8/0x10c)
> [    4.130128] [<c07c1994>] (__dev_open) from [<c07c1c1c>]
> (__dev_change_flags+0x94/0x144)
> [    4.137769] [<c07c1c1c>] (__dev_change_flags) from [<c07c1ce4>]
> (dev_change_flags+0x18/0x48)
> [    4.145670] [<c07c1ce4>] (dev_change_flags) from [<c0823048>]
> (devinet_ioctl+0x6b0/0x768)
> [    4.154357] [<c0823048>] (devinet_ioctl) from [<c07a4ac4>]
> (sock_ioctl+0x1f4/0x2c8)
> [    4.162425] [<c07a4ac4>] (sock_ioctl) from [<c0432678>]
> (do_vfs_ioctl+0x9c/0x910)
> [    4.169887] [<c0432678>] (do_vfs_ioctl) from [<c0432f20>]
> (SyS_ioctl+0x34/0x5c)
> [    4.177529] [<c0432f20>] (SyS_ioctl) from [<c0308480>]
> (ret_fast_syscall+0x0/0x3c)
> [    4.184635] handlers:
> [    4.192273] [<c036911c>] bad_chained_irq
> [    4.198255] Disabling IRQ #109
> (...)
> [   34.170316] smsc911x 1b800000.ethernet-ebi2 eth0: ISR failed
> signaling test (IRQ 208)

Is this platform related to the Dragonboard 410C? I've got one from
Sudeep, and it seems to work fine (though I've spotted a couple of
gotchas in the DT).

Do you see this symptom on all chained interrupts? Or just this
particular one?

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...

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