So far, managed interrupts are only used for PCI MSIs. This series adds platform device support for managed interrupts. Initially this topic was discussed at [0]. The method to enable managed interrupts is to allocate a group of IRQs for the device, and then switch the interrupts to managed - this is done through new function irq_update_affinity_desc(). Function devm_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(). In the devm_platform_get_irqs_affinity() release call a new platform method is used to "put" an irq. The reason for this is that per-irq mapping (and irq_desc) needs to be recreated anew for re-probing the LLDD, such that we don't attempt to reconfigure the managed or any other flag for an irq_desc. 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. [0] https://lore.kernel.org/lkml/84a9411b-4ae3-1928-3d35-1666f2687ec8@xxxxxxxxxx/ Changes since v2: - Update genirq change as follows: - Handle when the irq is started, active, or already managed - Reject update when CONFIG_GENERIC_IRQ_RESERVATION_MODE is set - Revamp platform.c API as follows: - Make it devm type - Add platform_put_irq() and associated change in ACPI code to allow irq resource to be reset - Unmap irqs for driver removal - Change API to accept min and max vectors John Garry (5): genirq/affinity: Add irq_update_affinity_desc() ACPI: Make acpi_dev_irqresource_disabled() public driver core: platform: Add platform_put_irq() Driver core: platform: Add devm_platform_get_irqs_affinity() scsi: hisi_sas: Expose HW queues for v2 hw drivers/acpi/resource.c | 2 +- drivers/base/platform.c | 126 +++++++++++++++++++++++++ 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 | 68 ++++++++++--- include/linux/acpi.h | 5 + include/linux/interrupt.h | 8 ++ include/linux/platform_device.h | 6 ++ kernel/irq/manage.c | 63 +++++++++++++ 9 files changed, 279 insertions(+), 14 deletions(-) -- 2.26.2
