[RFC 0/8] kgdb: NMI/FIQ support for ARM
daniel.thompson at linaro.org
Wed May 14 08:58:37 PDT 2014
This patchset makes it possible to use the kgdb NMI infrastructure
on ARM platforms.
The kgdb NMI infrastructure works by re-routing an UARTs interrupt
signal from IRQ to FIQ. The UART will no longer function normally
and will instead be managed by kgdb using the polled I/O functions.
Any character delivered to the UART causes the kgdb handler function
to be called. Each serial driver explicitly consents (or not) to this
abuse by calling the appropriate registration functions.
[PATCH 1/8] arm: fiq: Allow EOI to be communicated to the intc
[PATCH 2/8] irqchip: gic: Provide support for interrupt grouping
Both these patches lay the ground work to allow modern ARM
interrupt controllers to support FIQ correctly.
[PATCH 3/8] ARM: Move some macros from entry-armv to entry-header
[PATCH 4/8] ARM: Add KGDB/KDB FIQ debugger generic code
This is the heart of the patch series, allowing FIQs to be
registered with KGDB and handled by KGDB.
[PATCH 5/8] serial: amba-pl011: Pass on FIQ information to KGDB.
[PATCH 6/8] serial: asc: Add support for KGDB's FIQ/NMI mode
Extend to UART drivers to allow the register the appropriate FIQ
(implicitly promising to behave properly when their own IRQ handler
is cut off).
[PATCH 7/8] ARM: VIC: Add vic_set_fiq function to select if an...
[PATCH 8/8] arm: fiq: Hack FIQ routing backdoors into GIC and VIC
Here we hit the serious request-for-comment section. It is not
clear what the best way to get the interrupt controller to re-route
an interrupt source from the IRQ signal to the FIQ signal.
Clearly the approach here is wrong but it has been enough for me
to test my work so far.
Anton Vorontsov (2):
ARM: Move some macros from entry-armv to entry-header
ARM: Add KGDB/KDB FIQ debugger generic code
Arve Hjønnevåg (1):
ARM: VIC: Add vic_set_fiq function to select if an interrupt should
generate an IRQ or FIQ
Daniel Thompson (5):
arm: fiq: Allow EOI to be communicated to the intc
irqchip: gic: Provide support for interrupt grouping
serial: amba-pl011: Pass on FIQ information to KGDB.
serial: asc: Add support for KGDB's FIQ/NMI mode
arm: fiq: Hack FIQ routing backdoors into GIC and VIC
arch/arm/Kconfig | 2 +
arch/arm/Kconfig.debug | 18 ++++
arch/arm/boot/dts/stih416.dtsi | 2 +-
arch/arm/boot/dts/vexpress-v2m-rs1.dtsi | 2 +-
arch/arm/include/asm/fiq.h | 1 +
arch/arm/include/asm/kgdb.h | 7 ++
arch/arm/kernel/Makefile | 1 +
arch/arm/kernel/entry-armv.S | 151 +----------------------------
arch/arm/kernel/entry-header.S | 164 ++++++++++++++++++++++++++++++++
arch/arm/kernel/fiq.c | 50 ++++++++++
arch/arm/kernel/kgdb_fiq.c | 117 +++++++++++++++++++++++
arch/arm/kernel/kgdb_fiq_entry.S | 87 +++++++++++++++++
drivers/irqchip/irq-gic.c | 62 +++++++++++-
drivers/irqchip/irq-vic.c | 23 +++++
drivers/tty/serial/amba-pl011.c | 18 +++-
drivers/tty/serial/st-asc.c | 25 +++++
include/linux/irqchip/arm-gic.h | 3 +
include/linux/irqchip/arm-vic.h | 1 +
18 files changed, 576 insertions(+), 158 deletions(-)
create mode 100644 arch/arm/kernel/kgdb_fiq.c
create mode 100644 arch/arm/kernel/kgdb_fiq_entry.S
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