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genirq/affinity: Add support for allocating interrupt sets

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A driver may have a need to allocate multiple sets of MSI/MSI-X interrupts,
and have them appropriately affinitized.

Add support for defining a number of sets in the irq_affinity structure, of
varying sizes, and get each set affinitized correctly across the machine.

[ tglx: Minor changelog tweaks ]

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Cc: linux-block@vger.kernel.org
Link: https://lkml.kernel.org/r/20181102145951.31979-5-ming.lei@redhat.com
This commit is contained in:
Jens Axboe
2018-11-02 22:59:51 +08:00
committed by Thomas Gleixner
parent 060746d9e3
commit 6da4b3ab9a
3 changed files with 72 additions and 23 deletions
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14
drivers/pci/msi.c
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@@ -1036,6 +1036,13 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
if (maxvec < minvec)
return -ERANGE;
/*
* If the caller is passing in sets, we can't support a range of
* vectors. The caller needs to handle that.
*/
if (affd && affd->nr_sets && minvec != maxvec)
return -EINVAL;
if (WARN_ON_ONCE(dev->msi_enabled))
return -EINVAL;
@@ -1087,6 +1094,13 @@ static int __pci_enable_msix_range(struct pci_dev *dev,
if (maxvec < minvec)
return -ERANGE;
/*
* If the caller is passing in sets, we can't support a range of
* supported vectors. The caller needs to handle that.
*/
if (affd && affd->nr_sets && minvec != maxvec)
return -EINVAL;
if (WARN_ON_ONCE(dev->msix_enabled))
return -EINVAL;