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:
cpu_set_t mask;
CPU_ZERO(&mask);
CPU_SET(4, &mask); //CPU 4 only
rtdm_cpumask_t rtdm_mask;
rtdm_mask.mask = &mask;
rtdm_mask.size = sizeof(mask);
ret = ioctl(fd, GPIO_RTIOC_IRQAFF, &rtdm_mask);
if (ret) {
fprintf(stderr, "Failed to set interrupt 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.
Changes to v1:
* Adding new type rtdm_cpumask_t for passing CPU bitmasks
* Changed affinity bitmask type from int to new rtdm_cpumask_t*
* Added documentation of function rtdm_irq_affinity()
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 | 6 ++++++
kernel/cobalt/rtdm/drvlib.c | 18 ++++++++++++++++++
kernel/drivers/gpio/gpio-core.c | 30 ++++++++++++++++++++++++++++++
4 files changed, 60 insertions(+)
--
2.11.0
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