On 24 October 2016 at 15:31, Sinan Kaya <okaya@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxx > Reported-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx> > Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx> > --- > 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@xxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
