On 10/23/2017 04:59 PM, Christoph Muellner wrote:
> This patch series adds an API to the RTDM GPIO layer to set a GPIO interrupt's
> CPU affinity to Xenomai's next branch.
>
> A Xenomai application can use this API with a code similar to this:
>
> int mask = 1 << 4; //CPU4 only
cpu_set_t would be required here. We may have more than 32 CPU cores
only using a portion of them for rt duties.
> ret = ioctl(gpio_in_fd, GPIO_RTIOC_IRQAFF, &mask);
> if (ret) {
> fprintf(stderr, "Failed to set interrupt's CPU affinity.\n");
> return -1;
> }
>
> Of course this only works, if the underlying GPIO driver supports setting
> the IRQ affinity. I.e. the irq_set_affinity function needs to be set in the
> struct irq_chip.
>
> Tested on a RK3399 (arm64).
>
> Christoph Muellner (3):
> cobalt: rtdm: Add function rtdm_irq_affinity().
> RTDM: uapi: Define ioctl code to set an IRQ affinity.
> kernel: rtdm: gpio: Add support for GPIO_RTIOC_IRQAFF.
>
> include/cobalt/kernel/rtdm/driver.h | 6 ++++++
> include/rtdm/uapi/gpio.h | 1 +
> kernel/drivers/gpio/gpio-core.c | 25 +++++++++++++++++++++++++
> 3 files changed, 32 insertions(+)
>
--
Philippe.
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