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Message-ID: <CANwerB1JeRptgMdQ2q+7DmH7ivOR_JK4Z637TYjm7UAbXEhHEg@mail.gmail.com>
Date: Mon, 24 Oct 2016 15:46:37 +1100
From: Jonathan Liu <net147@...il.com>
To: Sinan Kaya <okaya@...eaurora.org>
Cc: linux-acpi@...r.kernel.org, rjw@...ysocki.net,
Bjorn Helgaas <bhelgaas@...gle.com>, ravikanth.nalla@....com,
linux@...nbow-software.org, timur@...eaurora.org,
cov@...eaurora.org, jcm@...hat.com, alex.williamson@...hat.com,
linux-pci@...r.kernel.org, Andy Gross <agross@...eaurora.org>,
linux-arm-msm@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, wim@....tudelft.nl,
Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V5 2/3] ACPI: pci_link: penalize SCI correctly
On 24 October 2016 at 15:31, Sinan Kaya <okaya@...eaurora.org> wrote:
> Ondrej reported that IRQs stopped working in v4.7 on several
> platforms. A typical scenario, from Ondrej's VT82C694X/694X, is:
>
> ACPI: Using PIC for interrupt routing
> ACPI: PCI Interrupt Link [LNKA] (IRQs 1 3 4 5 6 7 10 *11 12 14 15)
> ACPI: No IRQ available for PCI Interrupt Link [LNKA]
> 8139too 0000:00:0f.0: PCI INT A: no GSI
>
> We're using PIC routing, so acpi_irq_balance == 0, and LNKA is already
> active at IRQ 11. In that case, acpi_pci_link_allocate() only tries
> to use the active IRQ (IRQ 11) which also happens to be the SCI.
>
> We should penalize the SCI by PIRQ_PENALTY_PCI_USING, but
> irq_get_trigger_type(11) returns something other than
> IRQ_TYPE_LEVEL_LOW, so we penalize it by PIRQ_PENALTY_ISA_ALWAYS
> instead, which makes acpi_pci_link_allocate() assume the IRQ isn't
> available and give up.
>
> Add acpi_penalize_sci_irq() so platforms can tell us the SCI IRQ,
> trigger, and polarity directly and we don't have to depend on
> irq_get_trigger_type().
>
> Link: http://lkml.kernel.org/r/201609251512.05657.linux@rainbow-software.org
> Reported-by: Ondrej Zary <linux@...nbow-software.org>
> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
> ---
> arch/x86/kernel/acpi/boot.c | 1 +
> drivers/acpi/pci_link.c | 30 +++++++++++++++---------------
> include/linux/acpi.h | 1 +
> 3 files changed, 17 insertions(+), 15 deletions(-)
>
> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
> index 90d84c3..0ffd26e 100644
> --- a/arch/x86/kernel/acpi/boot.c
> +++ b/arch/x86/kernel/acpi/boot.c
> @@ -453,6 +453,7 @@ static void __init acpi_sci_ioapic_setup(u8 bus_irq, u16 polarity, u16 trigger,
> polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;
>
> mp_override_legacy_irq(bus_irq, polarity, trigger, gsi);
> + acpi_penalize_sci_irq(bus_irq, trigger, polarity);
>
> /*
> * stash over-ride to indicate we've been here
> diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
> index 6229b02..74bf96e 100644
> --- a/drivers/acpi/pci_link.c
> +++ b/drivers/acpi/pci_link.c
> @@ -87,6 +87,7 @@ struct acpi_pci_link {
>
> static LIST_HEAD(acpi_link_list);
> static DEFINE_MUTEX(acpi_link_lock);
> +static int sci_irq = -1, sci_penalty;
>
> /* --------------------------------------------------------------------------
> PCI Link Device Management
> @@ -496,25 +497,13 @@ static int acpi_irq_get_penalty(int irq)
> {
> int penalty = 0;
>
> - /*
> - * Penalize IRQ used by ACPI SCI. If ACPI SCI pin attributes conflict
> - * with PCI IRQ attributes, mark ACPI SCI as ISA_ALWAYS so it won't be
> - * use for PCI IRQs.
> - */
> - if (irq == acpi_gbl_FADT.sci_interrupt) {
> - u32 type = irq_get_trigger_type(irq) & IRQ_TYPE_SENSE_MASK;
> -
> - if (type != IRQ_TYPE_LEVEL_LOW)
> - penalty += PIRQ_PENALTY_ISA_ALWAYS;
> - else
> - penalty += PIRQ_PENALTY_PCI_USING;
> - }
> + if (irq == sci_irq)
> + penalty += sci_penalty;
>
> if (irq < ACPI_MAX_ISA_IRQS)
> return penalty + acpi_isa_irq_penalty[irq];
>
> - penalty += acpi_irq_pci_sharing_penalty(irq);
> - return penalty;
> + return penalty + acpi_irq_pci_sharing_penalty(irq);
> }
>
> int __init acpi_irq_penalty_init(void)
> @@ -881,6 +870,17 @@ bool acpi_isa_irq_available(int irq)
> acpi_irq_get_penalty(irq) < PIRQ_PENALTY_ISA_ALWAYS);
> }
>
> +void acpi_penalize_sci_irq(int irq, int trigger, int polarity)
> +{
> + sci_irq = irq;
> +
> + if (trigger == ACPI_MADT_TRIGGER_LEVEL &&
> + polarity == ACPI_MADT_POLARITY_ACTIVE_LOW)
> + sci_penalty = PIRQ_PENALTY_PCI_USING;
> + else
> + sci_penalty = PIRQ_PENALTY_ISA_ALWAYS;
> +}
> +
> /*
> * Over-ride default table to reserve additional IRQs for use by ISA
> * e.g. acpi_irq_isa=5
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index c5eaf2f..67d1d3e 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -318,6 +318,7 @@ struct pci_dev;
> int acpi_pci_irq_enable (struct pci_dev *dev);
> void acpi_penalize_isa_irq(int irq, int active);
> bool acpi_isa_irq_available(int irq);
> +void acpi_penalize_sci_irq(int irq, int trigger, int polarity);
> void acpi_pci_irq_disable (struct pci_dev *dev);
>
> extern int ec_read(u8 addr, u8 *val);
> --
> 1.9.1
>
This series fixes one or more network adapters not working in Linux
32-bit x86 guest running inside VirtualBox if I have 4 network
adapters enabled.
The following message no longer appears in the kernel log:
ACPI: No IRQ available for PCI Interrupt Link [LNKD]. Try pci=noacpi or acpi=off
Tested-by: Jonathan Liu <net147@...il.com>
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