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Subject: Re: [tip: irq/core] irqchip/xilinx: Enable generic irq multi handler
To:     Marc Zyngier <maz@kernel.org>,
        Michal Simek <michal.simek@xilinx.com>
Cc:     linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org,
        Thomas Gleixner <tglx@linutronix.de>,
        Stefan Asserhall <stefan.asserhall@xilinx.com>,
        x86 <x86@kernel.org>, Stephen Rothwell <sfr@canb.auug.org.au>
References: <20200317125600.15913-4-mubin.usman.sayyed@xilinx.com>
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 <083ad708-ea4d-ed53-598e-84d911ca4177@xilinx.com>
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 <895eba40-2e77-db1b-ea82-035c05f0b77e@xilinx.com>
 <ca0f62da-1e89-4fe8-5cb4-b7a86f97c5a3@xilinx.com>
 <21f1157d885071dcfdb1de0847c19e24@kernel.org>
From:   Michal Simek <michal.simek@xilinx.com>
Message-ID: <44b64be7-9240-fd52-af90-e0245220f38b@xilinx.com>
Date:   Mon, 30 Mar 2020 11:27:55 +0200
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On 30. 03. 20 11:19, Marc Zyngier wrote:
> On 2020-03-30 10:12, Michal Simek wrote:
>> On 30. 03. 20 11:03, Michal Simek wrote:
>>> On 30. 03. 20 10:45, Marc Zyngier wrote:
>>>> On 2020-03-30 09:32, Michal Simek wrote:
>>>>> Hi Thomas and Marc,
>>>>>
>>>>> On 29. 03. 20 22:26, tip-bot2 for Michal Simek wrote:
>>>>>> The following commit has been merged into the irq/core branch of tip:
>>>>>>
>>>>>> Commit-ID:     a0789993bf8266e62fea6b4613945ba081c71e7d
>>>>>> Gitweb:       
>>>>>> https://git.kernel.org/tip/a0789993bf8266e62fea6b4613945ba081c71e7d
>>>>>> Author:        Michal Simek <michal.simek@xilinx.com>
>>>>>> AuthorDate:    Tue, 17 Mar 2020 18:25:59 +05:30
>>>>>> Committer:     Marc Zyngier <maz@kernel.org>
>>>>>> CommitterDate: Sun, 22 Mar 2020 11:52:53
>>>>>>
>>>>>> irqchip/xilinx: Enable generic irq multi handler
>>>>>>
>>>>>> Register default arch handler via driver instead of directly
>>>>>> pointing to
>>>>>> xilinx intc controller. This patch makes architecture code more
>>>>>> generic.
>>>>>>
>>>>>> Driver calls generic domain specific irq handler which does the
>>>>>> most of
>>>>>> things self. Also get rid of concurrent_irq counting which hasn't
>>>>>> been
>>>>>> exported anywhere.
>>>>>> Based on this loop was also optimized by using do/while loop
>>>>>> instead of
>>>>>> goto loop.
>>>>>>
>>>>>> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
>>>>>> Signed-off-by: Marc Zyngier <maz@kernel.org>
>>>>>> Reviewed-by: Stefan Asserhall <stefan.asserhall@xilinx.com>
>>>>>> Link:
>>>>>> https://lore.kernel.org/r/20200317125600.15913-4-mubin.usman.sayyed@xilinx.com
>>>>>>
>>>>>>
>>>>>> ---
>>>>>>  arch/microblaze/Kconfig           |  2 ++-
>>>>>>  arch/microblaze/include/asm/irq.h |  3 +---
>>>>>>  arch/microblaze/kernel/irq.c      | 21 +-------------------
>>>>>>  drivers/irqchip/irq-xilinx-intc.c | 34
>>>>>> +++++++++++++++++-------------
>>>>>>  4 files changed, 23 insertions(+), 37 deletions(-)
>>>>>>
>>>>>> diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
>>>>>> index 6a331bd..242f58e 100644
>>>>>> --- a/arch/microblaze/Kconfig
>>>>>> +++ b/arch/microblaze/Kconfig
>>>>>> @@ -47,6 +47,8 @@ config MICROBLAZE
>>>>>>      select CPU_NO_EFFICIENT_FFS
>>>>>>      select MMU_GATHER_NO_RANGE if MMU
>>>>>>      select SPARSE_IRQ
>>>>>> +    select GENERIC_IRQ_MULTI_HANDLER
>>>>>> +    select HANDLE_DOMAIN_IRQ
>>>>>>
>>>>>>  # Endianness selection
>>>>>>  choice
>>>>>> diff --git a/arch/microblaze/include/asm/irq.h
>>>>>> b/arch/microblaze/include/asm/irq.h
>>>>>> index eac2fb4..5166f08 100644
>>>>>> --- a/arch/microblaze/include/asm/irq.h
>>>>>> +++ b/arch/microblaze/include/asm/irq.h
>>>>>> @@ -14,7 +14,4 @@
>>>>>>  struct pt_regs;
>>>>>>  extern void do_IRQ(struct pt_regs *regs);
>>>>>>
>>>>>> -/* should be defined in each interrupt controller driver */
>>>>>> -extern unsigned int xintc_get_irq(void);
>>>>>> -
>>>>>>  #endif /* _ASM_MICROBLAZE_IRQ_H */
>>>>>> diff --git a/arch/microblaze/kernel/irq.c
>>>>>> b/arch/microblaze/kernel/irq.c
>>>>>> index 903dad8..0b37dde 100644
>>>>>> --- a/arch/microblaze/kernel/irq.c
>>>>>> +++ b/arch/microblaze/kernel/irq.c
>>>>>> @@ -20,29 +20,10 @@
>>>>>>  #include <linux/irqchip.h>
>>>>>>  #include <linux/of_irq.h>
>>>>>>
>>>>>> -static u32 concurrent_irq;
>>>>>> -
>>>>>>  void __irq_entry do_IRQ(struct pt_regs *regs)
>>>>>>  {
>>>>>> -    unsigned int irq;
>>>>>> -    struct pt_regs *old_regs = set_irq_regs(regs);
>>>>>>      trace_hardirqs_off();
>>>>>> -
>>>>>> -    irq_enter();
>>>>>> -    irq = xintc_get_irq();
>>>>>> -next_irq:
>>>>>> -    BUG_ON(!irq);
>>>>>> -    generic_handle_irq(irq);
>>>>>> -
>>>>>> -    irq = xintc_get_irq();
>>>>>> -    if (irq != -1U) {
>>>>>> -        pr_debug("next irq: %d\n", irq);
>>>>>> -        ++concurrent_irq;
>>>>>> -        goto next_irq;
>>>>>> -    }
>>>>>> -
>>>>>> -    irq_exit();
>>>>>> -    set_irq_regs(old_regs);
>>>>>> +    handle_arch_irq(regs);
>>>>>>      trace_hardirqs_on();
>>>>>>  }
>>>>>>
>>>>>> diff --git a/drivers/irqchip/irq-xilinx-intc.c
>>>>>> b/drivers/irqchip/irq-xilinx-intc.c
>>>>>> index 1d3d273..ea74181 100644
>>>>>> --- a/drivers/irqchip/irq-xilinx-intc.c
>>>>>> +++ b/drivers/irqchip/irq-xilinx-intc.c
>>>>>> @@ -124,20 +124,6 @@ static unsigned int xintc_get_irq_local(struct
>>>>>> xintc_irq_chip *irqc)
>>>>>>      return irq;
>>>>>>  }
>>>>>>
>>>>>> -unsigned int xintc_get_irq(void)
>>>>>> -{
>>>>>> -    unsigned int irq = -1;
>>>>>> -    u32 hwirq;
>>>>>> -
>>>>>> -    hwirq = xintc_read(primary_intc, IVR);
>>>>>> -    if (hwirq != -1U)
>>>>>> -        irq = irq_find_mapping(primary_intc->root_domain, hwirq);
>>>>>> -
>>>>>> -    pr_debug("irq-xilinx: hwirq=%d, irq=%d\n", hwirq, irq);
>>>>>> -
>>>>>> -    return irq;
>>>>>> -}
>>>>>> -
>>
>> One more thing. We could also get this function back and it will be fine
>> too. But up2you.
> 
> If you leave it up to me, I'll revert the whole series right now.
> 
> What I'd expect from you is to tell me exactly what is the minimal
> change that keeps it working on both ARM, microblaze and PPC.
> If it is a revert, tell me which patches to revert. if it is a patch
> on top, send me the fix so that I can queue it now.

It won't be that simple. Please revert patches

9c2d4f525c00 ("irqchip/xilinx: Do not call irq_set_default_host()")
a0789993bf82 ("irqchip/xilinx: Enable generic irq multi handler")

And we should be fine.

Thanks,
Michal