From: Marc Zyngier <maz@kernel.org>
To: Michal Simek <michal.simek@xilinx.com>
Cc: Mubin Usman Sayyed <mubin.usman.sayyed@xilinx.com>,
tglx@linutronix.de, jason@lakedaemon.net,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, siva.durga.paladugu@xilinx.com,
anirudha.sarangi@xilinx.com
Subject: Re: [PATCH v2] irqchip: xilinx: Add support for multiple instances
Date: Thu, 06 Feb 2020 09:15:54 +0000 [thread overview]
Message-ID: <a3008824af22411034a6172cf09b450f@kernel.org> (raw)
In-Reply-To: <575c6350-139b-65b9-f9e2-2633656baa85@xilinx.com>
On 2020-02-06 09:11, Michal Simek wrote:
> On 06. 02. 20 10:09, Marc Zyngier wrote:
>> On 2020-02-06 07:06, Michal Simek wrote:
>>> On 05. 02. 20 17:53, Marc Zyngier wrote:
>>>> On 2020-02-05 14:05, Mubin Usman Sayyed wrote:
>>
>> [...]
>>
>>>>> unsigned int xintc_get_irq(void)
>>>>> {
>>>>> - unsigned int hwirq, irq = -1;
>>>>> + int hwirq, irq = -1;
>>>>>
>>>>> - hwirq = xintc_read(IVR);
>>>>> + hwirq = xintc_read(primary_intc->base + IVR);
>>>>> if (hwirq != -1U)
>>>>> - irq = irq_find_mapping(xintc_irqc->root_domain,
>>>>> hwirq);
>>>>> + irq = irq_find_mapping(primary_intc->root_domain,
>>>>> hwirq);
>>>>>
>>>>> pr_debug("irq-xilinx: hwirq=%d, irq=%d\n", hwirq, irq);
>>>>
>>>> I have the ugly feeling I'm reading the same code twice... Surely
>>>> you
>>>> can
>>>> make these two functions common code.
>>>
>>> I have some questions regarding this.
>>> I have updated one patchset which is adding support for Microblaze
>>> SMP.
>>> And when I was looking at current wiring of this driver I have
>>> decided
>>> to change it.
>>>
>>> I have enabled GENERIC_IRQ_MULTI_HANDLER and HANDLE_DOMAIN_IRQ.
>>> This driver calls set_handle_irq(xil_intc_handle_irq)
>>> and MB do_IRQ() call handle_arch_irq()
>>> and IRQ routine here is using handle_domain_irq().
>>>
>>> I would expect that this chained IRQ handler can also use
>>> handle_domain_irq().
>>>
>>> Is that correct understanding?
>>
>> handle_domain_irq() implies that you have a set of pt_regs,
>> representing
>> the context you interrupted. You can't fake that up, so I can't see
>> how
>> you use it in a chained context.
>
> ok. What's your recommendation for chained controller? Just go with
> irq_find_mapping?
For now, yes. I have (distant) plans to improve this.
M.
--
Jazz is not dead. It just smells funny...
next prev parent reply other threads:[~2020-02-06 9:15 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-05 14:05 [PATCH v2] irqchip: xilinx: Add support for multiple instances Mubin Usman Sayyed
2020-02-05 14:15 ` David Laight
2020-02-05 14:54 ` Michal Simek
2020-02-06 8:07 ` Mubin Usman Sayyed
2020-02-05 14:53 ` Michal Simek
2020-02-06 8:02 ` Mubin Usman Sayyed
2020-02-05 16:53 ` Marc Zyngier
2020-02-06 7:06 ` Michal Simek
2020-02-06 9:09 ` Marc Zyngier
2020-02-06 9:11 ` Michal Simek
2020-02-06 9:15 ` Marc Zyngier [this message]
2020-02-06 9:17 ` Michal Simek
2020-02-11 19:38 ` Mubin Usman Sayyed
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