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From: Alexandru Elisei <alexandru.elisei@arm.com>
To: Andre Przywara <andre.przywara@arm.com>,
	Andrew Jones <drjones@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>
Cc: Marc Zyngier <maz@kernel.org>,
	kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org
Subject: Re: [kvm-unit-tests PATCH 15/17] arm: gic: Provide FIQ handler
Date: Wed, 13 Nov 2019 10:14:22 +0000
Message-ID: <efbf58a2-9f9d-b3b6-626f-e7bb3b5707a2@arm.com> (raw)
In-Reply-To: <20191108144240.204202-16-andre.przywara@arm.com>

Hi,

On 11/8/19 2:42 PM, Andre Przywara wrote:
> When configuring an interrupt as Group 0, we can ask the GIC to deliver
> them as a FIQ. For this we need a separate exception handler.
>
> Provide this to be used later.
>
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---
>  arm/gic.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>
> diff --git a/arm/gic.c b/arm/gic.c
> index c68b5b5..6756850 100644
> --- a/arm/gic.c
> +++ b/arm/gic.c
> @@ -178,6 +178,30 @@ static void irq_handler(struct pt_regs *regs __unused)
>  	smp_wmb(); /* pairs with rmb in check_acked */
>  }
>  
> +static inline void fiq_handler(struct pt_regs *regs __unused)
> +{
> +	u32 irqstat = gic_read_iar(0);
> +	u32 irqnr = gic_iar_irqnr(irqstat);
> +
> +	if (irqnr == GICC_INT_SPURIOUS) {
> +		++spurious[smp_processor_id()];
> +		smp_wmb();
> +		return;
> +	}
> +
> +	gic_write_eoir(irqstat, 0);
> +
> +	smp_rmb(); /* pairs with wmb in stats_reset */
> +	++acked[smp_processor_id()];
> +	if (irqnr < GIC_NR_PRIVATE_IRQS) {
> +		check_ipi_sender(irqstat);
> +		check_irqnr(irqnr, IPI_IRQ);
> +	} else {
> +		check_irqnr(irqnr, SPI_IRQ);
> +	}
> +	smp_wmb(); /* pairs with rmb in check_acked */
> +}

If I'm not mistaken, this is identical to irq_handler, with the exception that
gic_read_iar and gic_write_eoir take group 0 as argument here. Maybe we can
abstract the common code into a function that takes the group as the argument?
What do you think?

Thanks,
Alex
> +
>  static void gicv2_ipi_send_self(void)
>  {
>  	writel(2 << 24 | IPI_IRQ, gicv2_dist_base() + GICD_SGIR);
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Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-08 14:42 [kvm-unit-tests PATCH 00/17] arm: gic: Test SPIs and interrupt groups Andre Przywara
2019-11-08 14:42 ` [kvm-unit-tests PATCH 01/17] arm: gic: Enable GIC MMIO tests for GICv3 as well Andre Przywara
2019-11-08 17:28   ` Alexandru Elisei
2019-11-12 12:49   ` Auger Eric
2019-11-08 14:42 ` [kvm-unit-tests PATCH 02/17] arm: gic: Generalise function names Andre Przywara
2019-11-12 11:11   ` Alexandru Elisei
2019-11-12 12:49   ` Auger Eric
2019-11-08 14:42 ` [kvm-unit-tests PATCH 03/17] arm: gic: Provide per-IRQ helper functions Andre Przywara
2019-11-12 12:51   ` Alexandru Elisei
2019-11-12 15:53     ` Auger Eric
2019-11-12 16:53       ` Alexandru Elisei
2019-11-12 13:49   ` Auger Eric
2019-11-08 14:42 ` [kvm-unit-tests PATCH 04/17] arm: gic: Support no IRQs test case Andre Przywara
2019-11-12 13:26   ` Alexandru Elisei
2019-11-12 21:14     ` Auger Eric
2019-11-08 14:42 ` [kvm-unit-tests PATCH 05/17] arm: gic: Prepare IRQ handler for handling SPIs Andre Przywara
2019-11-12 13:36   ` Alexandru Elisei
2019-11-12 20:56   ` Auger Eric
2019-11-08 14:42 ` [kvm-unit-tests PATCH 06/17] arm: gic: Add simple shared IRQ test Andre Przywara
2019-11-12 13:54   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 07/17] arm: gic: Extend check_acked() to allow silent call Andre Przywara
2019-11-12 15:23   ` Alexandru Elisei
2019-11-14 12:32     ` Andrew Jones
2019-11-15 11:32       ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 08/17] arm: gic: Add simple SPI MP test Andre Przywara
2019-11-12 15:41   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 09/17] arm: gic: Add test for flipping GICD_CTLR.DS Andre Przywara
2019-11-12 16:42   ` Alexandru Elisei
2019-11-14 13:39     ` Vladimir Murzin
2019-11-14 14:17       ` Andre Przywara
2019-11-14 14:50         ` Vladimir Murzin
2019-11-14 15:21           ` Alexandru Elisei
2019-11-14 15:27             ` Peter Maydell
2019-11-14 15:47               ` Alexandru Elisei
2019-11-14 15:56                 ` Peter Maydell
2019-11-08 14:42 ` [kvm-unit-tests PATCH 10/17] arm: gic: Check for writable IGROUPR registers Andre Przywara
2019-11-12 16:51   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 11/17] arm: gic: Check for validity of both group enable bits Andre Przywara
2019-11-12 16:58   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 12/17] arm: gic: Change gic_read_iar() to take group parameter Andre Przywara
2019-11-12 17:19   ` Alexandru Elisei
2019-11-14 12:50     ` Andrew Jones
2019-11-08 14:42 ` [kvm-unit-tests PATCH 13/17] arm: gic: Change write_eoir() " Andre Przywara
2019-11-08 14:42 ` [kvm-unit-tests PATCH 14/17] arm: gic: Prepare for receiving GIC group 0 interrupts via FIQs Andre Przywara
2019-11-12 17:30   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 15/17] arm: gic: Provide FIQ handler Andre Przywara
2019-11-13 10:14   ` Alexandru Elisei [this message]
2019-11-08 14:42 ` [kvm-unit-tests PATCH 16/17] arm: gic: Prepare interrupt statistics for both groups Andre Przywara
2019-11-13 10:44   ` Alexandru Elisei
2019-11-08 14:42 ` [kvm-unit-tests PATCH 17/17] arm: gic: Test Group0 SPIs Andre Przywara
2019-11-13 11:26   ` Alexandru Elisei

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