linux-kernel - Re: [PATCH] irqchip/ti-sci-inta: fix processing of masked irqs

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Message-ID: <851d5063-475e-ea7b-6609-684b08283550@ti.com>
Date:   Thu, 9 Apr 2020 14:11:12 +0300
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Marc Zyngier <maz@...nel.org>
CC:     Nishanth Menon <nm@...com>, Peter Ujfalusi <peter.ujfalusi@...com>,
        Jason Cooper <jason@...edaemon.net>,
        Lokesh Vutla <lokeshvutla@...com>,
        Sekhar Nori <nsekhar@...com>, <linux-kernel@...r.kernel.org>,
        Tero Kristo <t-kristo@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        <linux-arm-kernel@...ts.infradead.org>,
        Vignesh Raghavendra <vigneshr@...com>
Subject: Re: [PATCH] irqchip/ti-sci-inta: fix processing of masked irqs



On 09/04/2020 12:31, Marc Zyngier wrote:
> On Wed, 8 Apr 2020 22:15:32 +0300
> Grygorii Strashko <grygorii.strashko@...com> wrote:
> 
>> The ti_sci_inta_irq_handler() does not take into account INTA IRQs state
>> (masked/unmasked) as it uses INTA_STATUS_CLEAR_j register to get INTA IRQs
>> status, which provides raw status value.
>> This causes hard IRQ handlers to be called or threaded handlers to be
>> scheduled many times even if corresponding INTA IRQ is masked.
>> Above, first of all, affects the LEVEL interrupts processing and causes
>> unexpected behavior up the system stack or crash.
>>
>> Fix it by using the Interrupt Masked Status INTA_STATUSM_j register which
>> provides masked INTA IRQs status.
>>
>> Fixes: 9f1463b86c13 ("irqchip/ti-sci-inta: Add support for Interrupt Aggregator driver")
>> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> 
> Given the failure mode, doesn't this deserve a Cc stable?

Sorry, was not sure how it works here.
"Fixes" tag now is usually enough to get included in stable.
Any way, I'll track it and if not included will re-send for stable.

> 
>> ---
>>   drivers/irqchip/irq-ti-sci-inta.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/irqchip/irq-ti-sci-inta.c b/drivers/irqchip/irq-ti-sci-inta.c
>> index 8f6e6b08eadf..7e3ebf6ed2cd 100644
>> --- a/drivers/irqchip/irq-ti-sci-inta.c
>> +++ b/drivers/irqchip/irq-ti-sci-inta.c
>> @@ -37,6 +37,7 @@
>>   #define VINT_ENABLE_SET_OFFSET	0x0
>>   #define VINT_ENABLE_CLR_OFFSET	0x8
>>   #define VINT_STATUS_OFFSET	0x18
>> +#define VINT_STATUS_MASKED_OFFSET	0x20
>>   
>>   /**
>>    * struct ti_sci_inta_event_desc - Description of an event coming to
>> @@ -116,7 +117,7 @@ static void ti_sci_inta_irq_handler(struct irq_desc *desc)
>>   	chained_irq_enter(irq_desc_get_chip(desc), desc);
>>   
>>   	val = readq_relaxed(inta->base + vint_desc->vint_id * 0x1000 +
>> -			    VINT_STATUS_OFFSET);
>> +			    VINT_STATUS_MASKED_OFFSET);
>>   
>>   	for_each_set_bit(bit, &val, MAX_EVENTS_PER_VINT) {
>>   		virq = irq_find_mapping(domain, vint_desc->events[bit].hwirq);
> 
> 
> Otherwise queued for post -rc1.

Thanks.

-- 
Best regards,
grygorii