From: Mark Rutland <mark.rutland@arm.com>
To: Vladimir Murzin <vladimir.murzin@arm.com>
Cc: linux-kernel@vger.kernel.org, aou@eecs.berkeley.edu,
catalin.marinas@arm.com, deanbo422@gmail.com, green.hu@gmail.com,
guoren@kernel.org, jonas@southpole.se, kernelfans@gmail.com,
linux-arm-kernel@lists.infradead.org, linux@armlinux.org.uk,
maz@kernel.org, nickhu@andestech.com, palmer@dabbelt.com,
paulmck@kernel.org, paul.walmsley@sifive.com,
peterz@infradead.org, shorne@gmail.com,
stefan.kristiansson@saunalahti.fi, tglx@linutronix.de,
torvalds@linux-foundation.org, tsbogend@alpha.franken.de,
vgupta@kernel.org, will@kernel.org
Subject: Re: [PATCH 09/15] irq: arm: perform irqentry in entry code
Date: Fri, 22 Oct 2021 18:58:54 +0100 [thread overview]
Message-ID: <20211022175854.GK86184@C02TD0UTHF1T.local> (raw)
In-Reply-To: <1dc39ac9-1a05-cf8d-2aef-633903a6338d@arm.com>
On Fri, Oct 22, 2021 at 05:34:20PM +0100, Vladimir Murzin wrote:
> On 10/22/21 4:36 PM, Mark Rutland wrote:
> > On Fri, Oct 22, 2021 at 04:18:18PM +0100, Vladimir Murzin wrote:
> >> Hi Mark,
> >>
> >> On 10/21/21 7:02 PM, Mark Rutland wrote:
> >>> +/*
> >>> + * TODO: restructure the ARMv7M entry logic so that this entry logic can live
> >>> + * in arch code.
> >>> + */
> >>> +asmlinkage void __exception_irq_entry
> >>> +static void nvic_handle_irq(irq_hw_number_t hwirq, struct pt_regs *regs)
> >>
> >> I'm seeing build time failure...
> >>
> >> drivers/irqchip/irq-nvic.c:50:8: error: two or more data types in declaration specifiers
> >> static void nvic_handle_irq(irq_hw_number_t hwirq, struct pt_regs *regs)
> >> ^~~~
> >> drivers/irqchip/irq-nvic.c:50:13: warning: 'nvic_handle_irq' defined but not used [-Wunused-function]
> >> static void nvic_handle_irq(irq_hw_number_t hwirq, struct pt_regs *regs)
> >>
> >> I've fixed that locally and planing to give it a go...
> >
> > Ah, whoops. I've removed the extraneous `static void` from
> > nvic_handle_irq() and build tested that as part of stm32_defconfig.
> >
> > The updated version is in my irq/handle-domain-irq branch at:
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git
> >
>
> $ cat /proc/interrupts
> CPU0
> 16: 24 nvic_irq 4 Edge mps2-clkevt
> 17: 0 nvic_irq 32 Edge mps2-uart-rx
> 18: 6 nvic_irq 33 Edge mps2-uart-tx
> 19: 0 nvic_irq 47 Edge mps2-uart-overrun
> Err: 0
>
> So if it helps feel free to add my
>
> Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
Thanks!
I've folded that in and uppdated the branch.
> As for TODO, is [1] look something you have been thinking of? IIUC,
> the show stopper is that hwirq is being passed from exception entry
> which retrieved via xPSR (IPSR to be precise). OTOH hwirq also available
> via Interrupt Controller Status Register (ICSR) thus can be used in
> driver itself... I gave [1] a go and it runs fine, yet I admit I might
> be missing something...
I hadn't thought about it in much detail, but that looks good!
I was wondering if we needed something like a
handle_arch_vectored_irq(), but if we can rely on the ICSR that seems
simpler overall. I'm not at all familiar with M-class, so I'm not sure
if there are pitfalls in this area.
Thanks,
Mark.
>
> [1]
>
> ---
> arch/arm/include/asm/v7m.h | 3 ++-
> arch/arm/kernel/entry-v7m.S | 10 +++-------
> drivers/irqchip/Kconfig | 1 +
> drivers/irqchip/irq-nvic.c | 21 +++++----------------
> 4 files changed, 11 insertions(+), 24 deletions(-)
>
> diff --git a/arch/arm/include/asm/v7m.h b/arch/arm/include/asm/v7m.h
> index b1bad30b15d2..f047629887e7 100644
> --- a/arch/arm/include/asm/v7m.h
> +++ b/arch/arm/include/asm/v7m.h
> @@ -13,6 +13,7 @@
> #define V7M_SCB_ICSR_PENDSVSET (1 << 28)
> #define V7M_SCB_ICSR_PENDSVCLR (1 << 27)
> #define V7M_SCB_ICSR_RETTOBASE (1 << 11)
> +#define V7M_SCB_ICSR_VECTACTIVE 0x000001ff
>
> #define V7M_SCB_VTOR 0x08
>
> @@ -38,7 +39,7 @@
> #define V7M_SCB_SHCSR_MEMFAULTENA (1 << 16)
>
> #define V7M_xPSR_FRAMEPTRALIGN 0x00000200
> -#define V7M_xPSR_EXCEPTIONNO 0x000001ff
> +#define V7M_xPSR_EXCEPTIONNO V7M_SCB_ICSR_VECTACTIVE
>
> /*
> * When branching to an address that has bits [31:28] == 0xf an exception return
> diff --git a/arch/arm/kernel/entry-v7m.S b/arch/arm/kernel/entry-v7m.S
> index 2e872a248e31..901c7cd1b1ce 100644
> --- a/arch/arm/kernel/entry-v7m.S
> +++ b/arch/arm/kernel/entry-v7m.S
> @@ -72,14 +72,10 @@ __irq_entry:
> @
> @ Invoke the IRQ handler
> @
> - mrs r0, ipsr
> - ldr r1, =V7M_xPSR_EXCEPTIONNO
> - and r0, r1
> - sub r0, #16
> - mov r1, sp
> + mov r0, sp
> stmdb sp!, {lr}
> - @ routine called with r0 = irq number, r1 = struct pt_regs *
> - bl nvic_handle_irq
> + @ routine called with r0 = struct pt_regs *
> + bl generic_handle_arch_irq
>
> pop {lr}
> @
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index aca7b595c4c7..b59a0bc0cd80 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -58,6 +58,7 @@ config ARM_NVIC
> bool
> select IRQ_DOMAIN_HIERARCHY
> select GENERIC_IRQ_CHIP
> + select GENERIC_IRQ_MULTI_HANDLER
>
> config ARM_VIC
> bool
> diff --git a/drivers/irqchip/irq-nvic.c b/drivers/irqchip/irq-nvic.c
> index 63bac3f78863..52ff0ed19f2f 100644
> --- a/drivers/irqchip/irq-nvic.c
> +++ b/drivers/irqchip/irq-nvic.c
> @@ -37,25 +37,13 @@
>
> static struct irq_domain *nvic_irq_domain;
>
> -static void __nvic_handle_irq(irq_hw_number_t hwirq)
> +static void __irq_entry nvic_handle_irq(struct pt_regs *regs)
> {
> - generic_handle_domain_irq(nvic_irq_domain, hwirq);
> -}
> + unsigned long icsr = readl_relaxed(BASEADDR_V7M_SCB + V7M_SCB_ICSR);
> + irq_hw_number_t hwirq = (icsr & V7M_SCB_ICSR_VECTACTIVE) - 16;
>
> -/*
> - * TODO: restructure the ARMv7M entry logic so that this entry logic can live
> - * in arch code.
> - */
> -asmlinkage void __exception_irq_entry
> -nvic_handle_irq(irq_hw_number_t hwirq, struct pt_regs *regs)
> -{
> - struct pt_regs *old_regs;
>
> - irq_enter();
> - old_regs = set_irq_regs(regs);
> - __nvic_handle_irq(hwirq);
> - set_irq_regs(old_regs);
> - irq_exit();
> + generic_handle_domain_irq(nvic_irq_domain, hwirq);
> }
>
> static int nvic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
> @@ -141,6 +129,7 @@ static int __init nvic_of_init(struct device_node *node,
> for (i = 0; i < irqs; i += 4)
> writel_relaxed(0, nvic_base + NVIC_IPR + i);
>
> + set_handle_irq(nvic_handle_irq);
> return 0;
> }
> IRQCHIP_DECLARE(armv7m_nvic, "arm,armv7m-nvic", nvic_of_init);
>
> > Thanks,
> > Mark.
> >
>
next prev parent reply other threads:[~2021-10-22 17:59 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-21 18:02 [PATCH 00/15] irq: remove handle_domain_{irq,nmi}() Mark Rutland
2021-10-21 18:02 ` [PATCH 01/15] irq: mips: avoid nested irq_enter() Mark Rutland
2021-10-22 10:38 ` Marc Zyngier
2021-10-22 15:05 ` Mark Rutland
2021-10-24 15:31 ` Thomas Bogendoerfer
2021-10-21 18:02 ` [PATCH 02/15] irq: mips: stop (ab)using handle_domain_irq() Mark Rutland
2021-10-24 15:30 ` Thomas Bogendoerfer
2021-10-21 18:02 ` [PATCH 03/15] irq: mips: simplify do_domain_IRQ() Mark Rutland
2021-10-24 15:31 ` Thomas Bogendoerfer
2021-10-28 17:07 ` Guenter Roeck
2021-10-28 17:11 ` Mark Rutland
2021-10-21 18:02 ` [PATCH 04/15] irq: simplify handle_domain_{irq,nmi}() Mark Rutland
2021-10-22 10:52 ` Marc Zyngier
2021-10-22 15:05 ` Mark Rutland
2021-10-21 18:02 ` [PATCH 05/15] irq: add generic_handle_arch_irq() Mark Rutland
2021-10-22 2:10 ` Pingfan Liu
2021-10-22 9:02 ` Mark Rutland
2021-10-22 2:33 ` Guo Ren
2021-10-22 8:52 ` Mark Rutland
2021-10-24 1:53 ` Guo Ren
2021-10-21 18:02 ` [PATCH 06/15] irq: arc: avoid CONFIG_HANDLE_DOMAIN_IRQ Mark Rutland
2021-10-21 18:02 ` [PATCH 07/15] irq: nds32: " Mark Rutland
2021-10-22 6:35 ` Greentime Hu
2021-10-21 18:02 ` [PATCH 08/15] irq: add a (temporary) CONFIG_HANDLE_DOMAIN_IRQ_IRQENTRY Mark Rutland
2021-10-21 18:02 ` [PATCH 09/15] irq: arm: perform irqentry in entry code Mark Rutland
2021-10-22 15:18 ` Vladimir Murzin
2021-10-22 15:36 ` Mark Rutland
2021-10-22 16:34 ` Vladimir Murzin
2021-10-22 17:58 ` Mark Rutland [this message]
2021-10-22 18:43 ` Marc Zyngier
2021-10-23 12:06 ` Vladimir Murzin
2021-10-23 13:18 ` Marc Zyngier
2021-10-23 13:36 ` Vladimir Murzin
2021-11-30 8:49 ` Vladimir Murzin
2021-12-01 7:56 ` Marc Zyngier
2021-10-21 18:02 ` [PATCH 10/15] irq: arm64: " Mark Rutland
2021-10-22 1:57 ` Pingfan Liu
2021-10-25 18:00 ` Catalin Marinas
2021-10-21 18:02 ` [PATCH 11/15] irq: csky: " Mark Rutland
2021-10-22 2:19 ` Guo Ren
2021-10-22 2:26 ` Guo Ren
2021-10-21 18:02 ` [PATCH 12/15] irq: openrisc: " Mark Rutland
2021-10-22 20:40 ` Stafford Horne
2021-10-21 18:02 ` [PATCH 13/15] irq: riscv: " Mark Rutland
2021-10-22 1:59 ` Guo Ren
2021-10-27 21:22 ` Palmer Dabbelt
2021-10-21 18:02 ` [PATCH 14/15] irq: remove CONFIG_HANDLE_DOMAIN_IRQ_IRQENTRY Mark Rutland
2021-10-21 18:02 ` [PATCH 15/15] irq: remove handle_domain_{irq,nmi}() Mark Rutland
2021-10-22 10:05 ` Marc Zyngier
2021-10-22 15:06 ` Mark Rutland
2021-10-22 1:26 ` [PATCH 00/15] " Linus Torvalds
2021-10-22 11:20 ` Marc Zyngier
2021-10-22 15:10 ` Mark Rutland
2021-10-23 16:06 ` Marc Zyngier
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20211022175854.GK86184@C02TD0UTHF1T.local \
--to=mark.rutland@arm.com \
--cc=aou@eecs.berkeley.edu \
--cc=catalin.marinas@arm.com \
--cc=deanbo422@gmail.com \
--cc=green.hu@gmail.com \
--cc=guoren@kernel.org \
--cc=jonas@southpole.se \
--cc=kernelfans@gmail.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=maz@kernel.org \
--cc=nickhu@andestech.com \
--cc=palmer@dabbelt.com \
--cc=paul.walmsley@sifive.com \
--cc=paulmck@kernel.org \
--cc=peterz@infradead.org \
--cc=shorne@gmail.com \
--cc=stefan.kristiansson@saunalahti.fi \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=tsbogend@alpha.franken.de \
--cc=vgupta@kernel.org \
--cc=vladimir.murzin@arm.com \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).