So far, managed interrupts are only used for PCI MSIs. This series add platform device support for managed interrupts. Initially this topic was discussed at [0]. The method to enable managed interrupts is to allocate all the IRQs for the device, and then switch the interrupts to managed - this is done through new function irq_update_affinity_desc(). API platform_get_irqs_affinity() is added as a helper to manage this work, such that we don't need to export irq_update_affinity_desc() or irq_create_affinity_masks(). For now, the HiSilicon SAS v2 hw driver is switched over. This is used in the D05 dev board. Performance gain observed for 6x SAS SSDs is ~357K -> 420K IOPs for fio read. I hope - all going well - this series can go through the SCSI tree, since the non-SCSI changes are additive, thanks! [0] https://lore.kernel.org/lkml/84a9411b-4ae3-1928-3d35-1666f2687ec8@xxxxxxxxxx/ John Garry (2): Driver core: platform: Add platform_get_irqs_affinity() scsi: hisi_sas: Expose HW queues for v2 hw Thomas Gleixner (1): genirq/affinity: Add irq_update_affinity_desc() drivers/base/platform.c | 58 +++++++++++++++++++++ drivers/scsi/hisi_sas/hisi_sas.h | 4 ++ drivers/scsi/hisi_sas/hisi_sas_main.c | 11 ++++ drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 71 ++++++++++++++++++++++---- include/linux/interrupt.h | 8 +++ include/linux/platform_device.h | 5 ++ kernel/irq/manage.c | 19 +++++++ 7 files changed, 165 insertions(+), 11 deletions(-) -- 2.26.2
