This is a note to let you know that I've just added the patch titled

x86/acpi: Handle SCI interrupts above legacy space gracefully

to the 3.18-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: x86-acpi-handle-sci-interrupts-above-legacy-space-gracefully.patch and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 252714155f04c5d16989cb3aadb85fd1b5772f99 Mon Sep 17 00:00:00 2001

From: Vikas C Sajjan vikas.cha.sajjan@hpe.com Date: Thu, 16 Nov 2017 21:43:44 +0530 Subject: x86/acpi: Handle SCI interrupts above legacy space gracefully

From: Vikas C Sajjan vikas.cha.sajjan@hpe.com

commit 252714155f04c5d16989cb3aadb85fd1b5772f99 upstream.

Platforms which support only IOAPIC mode, pass the SCI information above the legacy space (0-15) via the FADT mechanism and not via MADT.

In such cases mp_override_legacy_irq() which is invoked from acpi_sci_ioapic_setup() to register SCI interrupts fails for interrupts greater equal 16, since it is meant to handle only the legacy space and emits error "Invalid bus_irq %u for legacy override".

Add a new function to handle SCI interrupts >= 16 and invoke it conditionally in acpi_sci_ioapic_setup().

The code duplication due to this new function will be cleaned up in a separate patch.

Co-developed-by: Sunil V L sunil.vl@hpe.com Signed-off-by: Vikas C Sajjan vikas.cha.sajjan@hpe.com Signed-off-by: Sunil V L sunil.vl@hpe.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Tested-by: Abdul Lateef Attar abdul-lateef.attar@hpe.com Acked-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Cc: linux-pm@vger.kernel.org Cc: kkamagui@gmail.com Cc: linux-acpi@vger.kernel.org Link: https://lkml.kernel.org/r/1510848825-21965-2-git-send-email-vikas.cha.sajjan... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- arch/x86/kernel/acpi/boot.c | 33 ++++++++++++++++++++++++++++++++- 1 file changed, 32 insertions(+), 1 deletion(-)

--- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -445,6 +445,34 @@ static struct irq_domain_ops acpi_irqdom .unmap = mp_irqdomain_unmap, };

+static int __init mp_register_ioapic_irq(u8 bus_irq, u8 polarity, + u8 trigger, u32 gsi) +{ + struct mpc_intsrc mp_irq; + int ioapic, pin; + + /* Convert 'gsi' to 'ioapic.pin'(INTIN#) */ + ioapic = mp_find_ioapic(gsi); + if (ioapic < 0) { + pr_warn("Failed to find ioapic for gsi : %u\n", gsi); + return ioapic; + } + + pin = mp_find_ioapic_pin(ioapic, gsi); + + mp_irq.type = MP_INTSRC; + mp_irq.irqtype = mp_INT; + mp_irq.irqflag = (trigger << 2) | polarity; + mp_irq.srcbus = MP_ISA_BUS; + mp_irq.srcbusirq = bus_irq; + mp_irq.dstapic = mpc_ioapic_id(ioapic); + mp_irq.dstirq = pin; + + mp_save_irq(&mp_irq); + + return 0; +} + static int __init acpi_parse_ioapic(struct acpi_subtable_header * header, const unsigned long end) { @@ -489,7 +517,10 @@ static void __init acpi_sci_ioapic_setup if (acpi_sci_flags & ACPI_MADT_POLARITY_MASK) polarity = acpi_sci_flags & ACPI_MADT_POLARITY_MASK;

- mp_override_legacy_irq(bus_irq, polarity, trigger, gsi); + if (bus_irq < NR_IRQS_LEGACY) + mp_override_legacy_irq(bus_irq, polarity, trigger, gsi); + else + mp_register_ioapic_irq(bus_irq, polarity, trigger, gsi);

/* * stash over-ride to indicate we've been here

Patches currently in stable-queue which might be from vikas.cha.sajjan@hpe.com are

queue-3.18/x86-acpi-handle-sci-interrupts-above-legacy-space-gracefully.patch