x86/acpi: Handle SCI interrupts above legacy space gracefully
authorVikas C Sajjan <vikas.cha.sajjan@hpe.com>
Thu, 16 Nov 2017 16:13:44 +0000 (21:43 +0530)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 17 Jan 2018 08:45:19 +0000 (09:45 +0100)
commit5bdc95c0a0dc58c15dcd3ffb56497683f800c455
tree471e723c996fd8a6c354fd44e623a51c7ed4ef7c
parent4659a641b36ed3f96c575ac1ef919a4d1c103936
x86/acpi: Handle SCI interrupts above legacy space gracefully

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@hpe.com
Cc: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/kernel/acpi/boot.c