linux-kernel - [PATCH V4 0/4] genirq/affinity: add .calc_sets for improving IRQ allocation & spread

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Date:   Thu, 14 Feb 2019 20:23:43 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Christoph Hellwig <hch@....de>, Bjorn Helgaas <helgaas@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, Keith Busch <keith.busch@...el.com>,
        Ming Lei <ming.lei@...hat.com>
Subject: [PATCH V4 0/4] genirq/affinity: add .calc_sets for improving IRQ allocation & spread

Hi,

Currently pre-caculated set vectors are provided by driver for
allocating & spread vectors. This way only works when drivers passes
same 'max_vecs' and 'min_vecs' to pci_alloc_irq_vectors_affinity(),
also requires driver to retry the allocating & spread.

As Bjorn and Keith mentioned, the current usage & interface for irq sets
is a bit awkward because the retrying should have been avoided by providing
one resonable 'min_vecs'. However, if 'min_vecs' isn't same with
'max_vecs', number of the allocated vectors is unknown before calling
pci_alloc_irq_vectors_affinity(), then each set's vectors can't be
pre-caculated.

Add a new callback of .calc_sets into 'struct irq_affinity' so that
driver can caculate set vectors after IRQ vector is allocated and
before spread IRQ vectors.

V4:
	- re-writen changelogs by Thomas Gleixner
	- merge patch of removing 'const' into the patch
	for adding new callback

V3:
	- don't mark 'affd' as const in related functions
	- add sanity check on affd->nr_sets
	- remove the local variable of 'nr_sets' in irq_create_affinity_masks
	- set .nr_sets as 2 in nvme
	- update comment in msi.c

V2:
	- add .calc_sets instead of .setup_affinity() which is easy to
	be abused by drivers

Ming Lei (4):
  genirq/affinity: store interrupt sets size in 'struct irq_affinity'
  genirq/affinity: add new callback for caculating interrupt sets size
  nvme-pci: Simplify interrupt allocation
  PCI: Document .calc_sets as required in case of multiple interrupt
    sets

 drivers/nvme/host/pci.c   | 63 ++++++++++++-----------------------------------
 drivers/pci/msi.c         | 32 +++++++++++++-----------
 include/linux/interrupt.h | 13 +++++++---
 include/linux/pci.h       |  4 +--
 kernel/irq/affinity.c     | 26 ++++++++++++-------
 5 files changed, 62 insertions(+), 76 deletions(-)

-- 
2.9.5