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Subject[PATCH V3 2/3] Revert "ACPI,PCI,IRQ: remove SCI penalize function"
Date
The SCI function was removed in two steps (first refactor and then remove).
This patch does the revert in one step.

The commit 103544d86976 ("ACPI,PCI,IRQ: reduce resource requirements")
refactored the original code so that SCI penalty is calculated dynamically
by the time get_penalty function is called. This patch does a partial
revert for the SCI functionality only.

The commit 9e5ed6d1fb87 ("ACPI,PCI,IRQ: remove SCI penalize function") is
for the removal of the function. SCI penalty API was replaced by the
runtime penalty calculation based on the value of
acpi_gbl_FADT.sci_interrupt.

The IRQ type does not get updated at the right time for some platforms and
results in incorrect penalty assignment for PCI IRQs as
irq_get_trigger_type returns the wrong type.

The register_gsi function delivers the IRQ found in the ACPI table to
the interrupt controller driver. Penalties are calculated before a
link object is enabled to find out which interrupt has the least number
of users. By the time penalties are calculated, the IRQ is not registered
yet and the API returns the wrong type.

Tested-by: Jonathan Liu <net147@gmail.com>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Link: https://lkml.org/lkml/2016/10/4/283
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/acpi/boot.c | 1 +
drivers/acpi/pci_link.c | 32 +++++++++++++-------------------
include/linux/acpi.h | 1 +
3 files changed, 15 insertions(+), 19 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 a212709..1934e2a 100644
--- a/drivers/acpi/pci_link.c
+++ b/drivers/acpi/pci_link.c
@@ -494,27 +494,10 @@ static int acpi_irq_pci_sharing_penalty(int irq)

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 < ACPI_MAX_ISA_IRQS)
- return penalty + acpi_isa_irq_penalty[irq];
+ return acpi_isa_irq_penalty[irq];

- penalty += acpi_irq_pci_sharing_penalty(irq);
- return penalty;
+ return acpi_irq_pci_sharing_penalty(irq);
}

int __init acpi_irq_penalty_init(void)
@@ -885,6 +868,17 @@ 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)
+{
+ if (irq >= 0 && irq < ARRAY_SIZE(acpi_isa_irq_penalty)) {
+ if (trigger != ACPI_MADT_TRIGGER_LEVEL ||
+ polarity != ACPI_MADT_POLARITY_ACTIVE_LOW)
+ acpi_isa_irq_penalty[irq] += PIRQ_PENALTY_ISA_ALWAYS;
+ else
+ acpi_isa_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
+ }
+}
+
/*
* 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
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