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Message-ID: <409514e35f5ed32de8a31977f6857077@kernel.org>
Date: Mon, 30 Mar 2020 10:14:19 +0100
From: Marc Zyngier <maz@...nel.org>
To: Michal Simek <michal.simek@...inx.com>
Cc: linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
Thomas Gleixner <tglx@...utronix.de>,
Stefan Asserhall <stefan.asserhall@...inx.com>,
x86 <x86@...nel.org>, Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [tip: irq/core] irqchip/xilinx: Enable generic irq multi handler
On 2020-03-30 10:03, 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@...inx.com>
>>>> AuthorDate: Tue, 17 Mar 2020 18:25:59 +05:30
>>>> Committer: Marc Zyngier <maz@...nel.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@...inx.com>
>>>> Signed-off-by: Marc Zyngier <maz@...nel.org>
>>>> Reviewed-by: Stefan Asserhall <stefan.asserhall@...inx.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;
>>>> -}
>>>> -
>>>> static int xintc_map(struct irq_domain *d, unsigned int irq,
>>>> irq_hw_number_t hw)
>>>> {
>>>> struct xintc_irq_chip *irqc = d->host_data;
>>>> @@ -177,6 +163,25 @@ static void xil_intc_irq_handler(struct
>>>> irq_desc
>>>> *desc)
>>>> chained_irq_exit(chip, desc);
>>>> }
>>>>
>>>> +static void xil_intc_handle_irq(struct pt_regs *regs)
>>>> +{
>>>> + u32 hwirq;
>>>> + struct xintc_irq_chip *irqc = primary_intc;
>>>> +
>>>> + do {
>>>> + hwirq = xintc_read(irqc, IVR);
>>>> + if (likely(hwirq != -1U)) {
>>>> + int ret;
>>>> +
>>>> + ret = handle_domain_irq(irqc->root_domain, hwirq,
>>>> regs);
>>>> + WARN_ONCE(ret, "Unhandled HWIRQ %d\n", hwirq);
>>>> + continue;
>>>> + }
>>>> +
>>>> + break;
>>>> + } while (1);
>>>> +}
>>>> +
>>>> static int __init xilinx_intc_of_init(struct device_node *intc,
>>>> struct device_node *parent)
>>>> {
>>>> @@ -246,6 +251,7 @@ static int __init xilinx_intc_of_init(struct
>>>> device_node *intc,
>>>> } else {
>>>> primary_intc = irqc;
>>>> irq_set_default_host(primary_intc->root_domain);
>>>> + set_handle_irq(xil_intc_handle_irq);
>>>> }
>>>>
>>>> return 0;
>>>>
>>>
>>> Stephen reported compilation issue when this patch is applied because
>>> of
>>> removal of xintc_get_irq() which is also used by ancient
>>> ppc405/ppc440
>>> xilinx platforms. I have reported this twice to Marc already last
>>> week.
>>
>> Did you? I can't possibly find these emails.
>
> Stephen was using your arm.com email.
>
> https://lore.kernel.org/linux-next/48d3232d-0f1d-42ea-3109-f44bbabfa2e8@xilinx.com/
Yeah, no chance I could read that, unfortunately. I've sent a separate
email to Stephen to update my email address.
>>
>>> On Friday I have also send v1 of removal of that platforms (need to
>>> send v2)
>>> https://lore.kernel.org/alsa-devel/cover.1585311091.git.michal.simek@xilinx.com/
>>>
>>
>> You want to remove exising platforms two days before the start of the
>> merge window?
>> I don't think this is acceptable with such short notice.
>
> I also don't think that will go through.
>
>>
>>> That's why please really consider next steps and let us know.
>>
>> I think the only option is to revert (at least partially) the Xilinx
>> series.
>
> Unfortunately.
Can you please check that we're OK reverting just the last two patches?
Or what is the minimal revert that can be done for everything to keep
working?
M.
--
Jazz is not dead. It just smells funny...
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