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From: Christoph Hellwig <hch@lst.de>
To: tglx@linutronix.de, axboe@fb.com
Cc: agordeev@redhat.com, linux-block@vger.kernel.org,
	linux-pci@vger.kernel.org, linux-nvme@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: automatic interrupt affinity for MSI/MSI-X capable devices V3
Date: Mon,  4 Jul 2016 17:39:21 +0900	[thread overview]
Message-ID: <1467621574-8277-1-git-send-email-hch@lst.de> (raw)

This series enhances the irq and PCI code to allow spreading around MSI and
MSI-X vectors so that they have per-cpu affinity if possible, or at least
per-node.  For that it takes the algorithm from blk-mq, moves it to
a common place, and makes it available through a vastly simplified PCI
interrupt allocation API.  It then switches blk-mq to be able to pick up
the queue mapping from the device if available, and demonstrates all this
using the NVMe driver.

Compared to the last posting the core IRQ changes are stable and it would
be great to get them merged int the tip tree.  The two PCI patches have
been completely rewritten after feedback from Alexander, while the block
changes have also been stable.

There also is a git tree available at:

   git://git.infradead.org/users/hch/block.git msix-spreading.6

Gitweb:

   http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/msix-spreading.6

Changes since V2:
 - improve the description of IRQD_AFFINITY_MANAGED
 - update MSI-HOWTO.txt
 - add a PCI_IRQ_NOMSI flag to avoid using MSI vectors
 - add a PCI_IRQ_NOAFFINITY flag to skip auto affinity
 - change the irq_create_affinity_mask calling convention
 - rewrite pci_alloc_irq_vectors to create the affinity mask only after
   we know the final vector count
 - cleanup pci_free_irq_vectors
 - replace pdev->irqs with pdev->msix_vectors and introduce
   a pci_irq_vector helper to get the Linux IRQ numbers

Changes since V1:
 - irq core improvements to properly assign the affinity before
   request_irq (tglx)
 - better handling of the MSI vs MSI-X differences in the low level
   MSI allocator (hch and tglx)
 - various improvements to pci_alloc_irq_vectors (hch)
 - remove blk-mq hardware queue reassigned on hotplug cpu events (hch)
 - forward ported to Jens' current for-next tree (hch)

             reply	other threads:[~2016-07-04  8:39 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-04  8:39 Christoph Hellwig [this message]
2016-07-04  8:39 ` [PATCH 01/13] irq/msi: Remove unused MSI_FLAG_IDENTITY_MAP Christoph Hellwig
2016-07-04 10:32   ` [tip:irq/core] genirq/msi: " tip-bot for Thomas Gleixner
2016-07-04  8:39 ` [PATCH 02/13] irq: Introduce IRQD_AFFINITY_MANAGED flag Christoph Hellwig
2016-07-04 10:32   ` [tip:irq/core] genirq: " tip-bot for Thomas Gleixner
2016-07-04  8:39 ` [PATCH 03/13] irq: Add affinity hint to irq allocation Christoph Hellwig
2016-07-04 10:33   ` [tip:irq/core] genirq: " tip-bot for Thomas Gleixner
2016-07-04  8:39 ` [PATCH 04/13] irq: Use affinity hint in irqdesc allocation Christoph Hellwig
2016-07-04 10:33   ` [tip:irq/core] genirq: " tip-bot for Thomas Gleixner
2016-07-04  8:39 ` [PATCH 05/13] irq/msi: Make use of affinity aware allocations Christoph Hellwig
2016-07-04 10:33   ` [tip:irq/core] genirq/msi: " tip-bot for Thomas Gleixner
2016-07-04  8:39 ` [PATCH 06/13] irq: add a helper spread an affinity mask for MSI/MSI-X vectors Christoph Hellwig
2016-07-04 10:34   ` [tip:irq/core] genirq: Add a helper to " tip-bot for Christoph Hellwig
2016-07-04  8:39 ` [PATCH 07/13] pci: Provide sensible irq vector alloc/free routines Christoph Hellwig
2016-07-06  8:05   ` Alexander Gordeev
2016-07-10  3:47     ` Christoph Hellwig
2016-07-11 10:43       ` Alexander Gordeev
2016-07-12  9:13         ` Christoph Hellwig
2016-07-12 12:46           ` Alexander Gordeev
2016-07-04  8:39 ` [PATCH 08/13] pci: spread interrupt vectors in pci_alloc_irq_vectors Christoph Hellwig
2016-07-07 11:05   ` Alexander Gordeev
2016-07-10  3:57     ` Christoph Hellwig
2016-07-12  6:49       ` Alexander Gordeev
2016-07-04  8:39 ` [PATCH 09/13] blk-mq: don't redistribute hardware queues on a CPU hotplug event Christoph Hellwig
2016-07-04  8:39 ` [PATCH 10/13] blk-mq: only allocate a single mq_map per tag_set Christoph Hellwig
2016-07-04  8:39 ` [PATCH 11/13] blk-mq: allow the driver to pass in an affinity mask Christoph Hellwig
2016-07-04  8:39 ` [PATCH 12/13] nvme: switch to use pci_alloc_irq_vectors Christoph Hellwig
2016-07-07 19:30   ` Alexander Gordeev
2016-07-10  3:59     ` Christoph Hellwig
2016-07-04  8:39 ` [PATCH 13/13] nvme: remove the post_scan callout Christoph Hellwig
2016-07-04 10:30 ` automatic interrupt affinity for MSI/MSI-X capable devices V3 Thomas Gleixner

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