Eric Lee / smarc-fsl-linux-kernel

03 Oct, 2011

1 commit

  • 31d9d9b6d   genirq: Add support for per-cpu dev_id interrupts ... Browse Code »

    The ARM GIC interrupt controller offers per CPU interrupts (PPIs),
    which are usually used to connect local timers to each core. Each CPU
    has its own private interface to the GIC, and only sees the PPIs that
    are directly connect to it.

    While these timers are separate devices and have a separate interrupt
    line to a core, they all use the same IRQ number.

    For these devices, request_irq() is not the right API as it assumes
    that an IRQ number is visible by a number of CPUs (through the
    affinity setting), but makes it very awkward to express that an IRQ
    number can be handled by all CPUs, and yet be a different interrupt
    line on each CPU, requiring a different dev_id cookie to be passed
    back to the handler.

    The *_percpu_irq() functions is designed to overcome these
    limitations, by providing a per-cpu dev_id vector:

    int request_percpu_irq(unsigned int irq, irq_handler_t handler,
    const char *devname, void __percpu *percpu_dev_id);
    void free_percpu_irq(unsigned int, void __percpu *);
    int setup_percpu_irq(unsigned int irq, struct irqaction *new);
    void remove_percpu_irq(unsigned int irq, struct irqaction *act);
    void enable_percpu_irq(unsigned int irq);
    void disable_percpu_irq(unsigned int irq);

    The API has a number of limitations:
    - no interrupt sharing
    - no threading
    - common handler across all the CPUs

    Once the interrupt is requested using setup_percpu_irq() or
    request_percpu_irq(), it must be enabled by each core that wishes its
    local interrupt to be delivered.

    Based on an initial patch by Thomas Gleixner.

    Signed-off-by: Marc Zyngier
    Cc: linux-arm-kernel@lists.infradead.org
    Link: http://lkml.kernel.org/r/1316793788-14500-2-git-send-email-marc.zyngier@arm.com
    Signed-off-by: Thomas Gleixner

    Marc Zyngier
     

12 Sep, 2011

1 commit

  • ed585a651   genirq: Make irq_shutdown() symmetric vs. irq_startup again ... Browse Code »
    1

    If an irq_chip provides .irq_shutdown(), but neither of .irq_disable() or
    .irq_mask(), free_irq() crashes when jumping to NULL.
    Fix this by only trying .irq_disable() and .irq_mask() if there's no
    .irq_shutdown() provided.

    This revives the symmetry with irq_startup(), which tries .irq_startup(),
    .irq_enable(), and irq_unmask(), and makes it consistent with the comment for
    irq_chip.irq_shutdown() in , which says:

    * @irq_shutdown: shut down the interrupt (defaults to ->disable if NULL)

    This is also how __free_irq() behaved before the big overhaul, cfr. e.g.
    3b56f0585fd4c02d047dc406668cb40159b2d340 ("genirq: Remove bogus conditional"),
    where the core interrupt code always overrode .irq_shutdown() to
    .irq_disable() if .irq_shutdown() was NULL.

    Signed-off-by: Geert Uytterhoeven
    Cc: linux-m68k@lists.linux-m68k.org
    Link: http://lkml.kernel.org/r/1315742394-16036-2-git-send-email-geert@linux-m68k.org
    Cc: stable@kernel.org
    Signed-off-by: Thomas Gleixner

    Geert Uytterhoeven
     

18 May, 2011

1 commit

  • edf76f830   irq: Export functions to allow modular irq drivers ... Browse Code »

    Export handle_simple_irq, irq_modify_status, irq_alloc_descs,
    irq_free_descs and generic_handle_irq to allow their usage in
    modules. First user is IIO, which wants to be built modular, but needs
    to be able to create irq chips, allocate and configure interrupt
    descriptors and handle demultiplexing interrupts.

    [ tglx: Moved the uninlinig of generic_handle_irq to a separate patch ]

    Signed-off-by: Jonathan Cameron
    Link: http://lkml.kernel.org/r/%3C1305711544-505-1-git-send-email-jic23%40cam.ac.uk%3E
    Signed-off-by: Thomas Gleixner

    Jonathan Cameron
     

23 Apr, 2011

1 commit

  • 7f1b1244e   genirq: Support per-IRQ thread disabling. ... Browse Code »

    This adds support for disabling threading on a per-IRQ basis via the IRQ
    status instead of the IRQ flow, which is necessary for interrupts that
    don't follow the natural IRQ flow channels, such as those that are
    virtually created.

    The new APIs added are simply:

    irq_set_thread()
    irq_set_nothread()

    which follow the rest of the IRQ status routines.

    Chained handlers also have IRQ_NOTHREAD set on them automatically, making
    the lack of threading explicit rather than implicit. Subsequently, the
    nothread flag can be viewed through the standard genirq debugging
    facilities.

    [ tglx: Fixed cleanup fallout ]

    Signed-off-by: Paul Mundt
    Link: http://lkml.kernel.org/r/%3C20110406210135.GF18426%40linux-sh.org%3E
    Signed-off-by: Thomas Gleixner

    Paul Mundt
     

31 Mar, 2011

1 commit

30 Mar, 2011

1 commit

29 Mar, 2011

2 commits

28 Mar, 2011

2 commits

27 Mar, 2011

4 commits

02 Mar, 2011

1 commit

22 Feb, 2011

1 commit

19 Feb, 2011

24 commits