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[0/3] Support managed interrupts for platform devices

Message ID 1603800624-180488-1-git-send-email-john.garry@huawei.com
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Series Support managed interrupts for platform devices | expand

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John Garry Oct. 27, 2020, 12:10 p.m. UTC 
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@huawei.com/

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(-)